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企业盈利质量分析中英文对照外文翻译文献

企业盈利质量分析中英文对照外文翻译文献(文档含英文原文和中文翻译)原文：Measuring the quality of earnings1. IntroductionGenerally accepted accounting principles (GAAP) offer some flexibility in preparing the financial statements and give the financial managers some freedom to select among accounting policies and alternatives. Earning management uses the flexibility in financial reporting to alter the financial results of the firm (Ortega and Grant, 2003).In other words, earnings management is manipulating the earning to achieve apredetermined target set by the management. It is a purposeful intervention in the external reporting process with the intent of obtaining some private gain (Schipper, 1989).Levit (1998) defines earning management as a gray area where the accounting is being perverted; where managers are cutting corners; and, where earnings reports reflect the desires of management rather than the underlying financial performance of the company.The popular press lists several instances of companies engaging in earnings management. Sensormatic Electronics, which stamped shipping dates and times on sold merchandise, stopped its clocks on the last day of a quarter until customer shipments reached its sales goal. Certain business units of Cendant Corporation inflated revenues nearly $500 million just prior to a merger; subsequently, Cendant restated revenues and agreed with the SEC to change revenue recognition practices. AOL restated earnings for $385 million in improperly deferred marketing expenses. In 1994, the Wall Street Journal detailed the many ways in which General Electric smoothed earnings, including the careful timing of capital gains and the use of restructuring charges and reserves, in response to the article, General Electric reportedly received calls from other corporations questioning why such common practices were “front-page” news.Earning management occurs when managers use judgment in financial reporting and in structuring transactions to alter financial reports to either mislead some stakeholders about the underlying economic performance of the company or to influence contractual outcomes that depend on reported accounting numbers (Healy and Whalen, 1999).Magrath and Weld (2002) indicate that abusive earnings management and fraudulent practices begins by engaging in earnings management schemes designed primarily to “smooth” earnings to meet internally or externally imposed earnings forecasts and analysts’ expectations.Even if earnings management does not explicitly violate accounting rules, it is an ethically questionable practice. An organization that manages its earnings sends amessage to its employees that bending the truth is an acceptable practice. Executives who partake of this practice risk creating an ethical climate in which other questionable activities may occur. A manager who asks the sales staff to help sales one day forfeits the moral authority to criticize questionable sales tactics another day.Earnings management can also become a very slippery slope, which relatively minor accounting gimmicks becoming more and more aggressive until they create material misstatements in the financial statements (Clikeman, 2003)The Securities and Exchange Commission (SEC) issued three staff accounting bulletins (SAB) to provide guidance on some accounting issues in order to prevent the inappropriate earnings management activities by public companies: SAB No. 99 “Materiality”, SAB No. 100 “Restructuring and Impairment Charges” and SAB No. 101 “Revenue Recognition”.Earnings management behavior may affect the quality of accounting earnings, which is defined by Schipper and Vincent (2003) as the extent to which the reported earnings faithfully represent Hichsian economic income, which is the amount that can be consumed (i.e. paid out as dividends) during a period, while leaving the firm equally well off at the beginning and the end of the period.Assessment of earning quality requires sometimes the separations of earnings into cash from operation and accruals, the more the earnings is closed to cash from operation, the higher earnings quality. As Penman (2001) states that the purpose of accounting quality analysis is to distinguish between the “hard” numbers resulting from cash flows and the “soft” numbers resulting from accrual accounting.The quality of earnings can be assessed by focusing on the earning persistence; high quality earnings are more persistent and useful in the process of decision making.Beneish and Vargus (2002) investigate whether insider trading is informative about earnings quality using earning persistence as a measure for the quality of earnings, they find that income-increasing accruals are significantly more persistent for firms with abnormal insider buying and significantly less persistent for firms with abnormal insider selling, relative to firms which there is no abnormal insider trading.Balsam et al. (2003) uses the level of discretionary accruals as a direct measurefor earning quality. The discretionary accruals model is based on a regression relationship between the change in total accruals as dependent variable and change in sales and change in the level of property, plant and equipment, change in cash flow from operations and change in firm size (total assets) as independent variables. If the regression coefficients in this model are significant that means that there is earning management in that firm and the earnings quality is low.This research presents an empirical study on using three different approaches of measuring the quality of earnings on different industry. The notion is; if there is a complete consistency among the three measures, a general assessment for the quality of earnings (high or low) can be reached and, if not, the quality of earnings is questionable and needs different other approaches for measurement and more investigations and analysis.The rest of the paper is divided into following sections: Earnings management incentives, Earnings management techniques, Model development, Sample and statistical results, and Conclusion.2. Earnings management incentives2.1 Meeting analysts’ expectationsIn general, analysts’ expectations and company predictions tend to address two high-profile components of financial performance: revenue and earnings from operations.The pressure to meet revenue expectations is particularly intense and may be the primary catalyst in leading managers to engage in earning management practices that result in questionable or fraudulent revenue recognition practices. Magrath and Weld (2002) indicate that improper revenue recognition practices were the cause of one-third of all voluntary or forced restatements of income filed with the SEC from 1977 to 2000.Ironically, it is often the companies themselves that create this pressure to meet the market’s earnings expec tations. It is common practice for companies to provide earnings estimates to analysts and investors. Management is often faced with the task of ensuring their targeted estimates are met.Several companies, including Coca-Cola Co., Intel Corp., and Gillette Co., have taken a contrary stance and no longer provide quarterly and annual earnings estimates to analysts. In doing so, these companies claim they have shifted their focus from meeting short-term earnings estimates to achieving their long-term strategies (Mckay and Brown, 2002).2.2 To avoid debt-covenant violations and minimize political costsSome firms have the incentive to avoid violating earnings-based debt covenants. If violated, the lender may be able to raise the interest rate on the debt or demand immediate repayment. Consequently, some firms may use earnings-management techniques to increase earnings to avoid such covenant violations. On the other hand, some other firms have the incentive to lower earnings in order to minimize political costs associated with being seen as too profitable. For example, if gasoline prices have been increasing significantly and oil companies are achieving record profit level, then there may be incentive for the government to intervene and enact an excess-profit tax or attempt to introduce price controls.2.3 To smooth earnings toward a long-term sustainable trendFor many years it has been believed that a firm should attempt to reduce the volatility in its earnings stream in order to maximize share price. Because a highly violate earning pattern indicates risk, therefore the stock will lose value compared to others with more stable earnings patterns. Consequently, firms have incentives to manage earnings to help achieve a smooth and growing earnings stream (Ortega and Grant, 2003).2.4 Meeting the bonus plan requirementsHealy (1985) provides the evidence that earnings are managed in the direction that is consistent with maximizing executives’ earnings-based bonus. When earnings will be below the minimum level required to earn a bonus, then earning are managed upward so that the minimum is achieved and a bonus is earned. Conversely, when earning will be above the maximum level at which no additional bonus is paid, then earnings are managed downward. The extra earnings that will not generate extra bonus this current period are saved to be used to earn a bonus in a future period.When earnings are between the minimum and the maximum levels, then earnings are managed upward in order to increase the bonus earned in the current period.2.5 Changing managementEarnings management usually occurs around the time of changing management, the CEO of a company with poor performance indicators will try to increase the reported earnings in order to prevent or postpone being fired. On the other hand, the new CEO will try shift part of the income to future years around the time when his/her performance will be evaluated and measured, and blame the low earning at the beginning of his contract on the acts of the previous CEO.3. Earnings management techniquesOne of the most common earnings management tools is reporting revenue before the seller has performed under the terms of a sales contract (SEC,SAB No. 101,1999).Another area of concern is where a company fails to comply with GAAP and inappropriately records restructuring charges and general reserves for future losses, reversing or relieving reserves in inappropriate periods, and recognizing or not recognizing an asset impairment charge in the appropriate period (SEC, SAB No. 100, 1999).Managers can influence reported expenses through assumptions and estimates such as the assumed rate of return on pension plan asset and the estimated useful lives of fixed assets, also they can influence reported earnings by controlling the timing of purchasing, deliveries, discretionary expenditures, and sale of assets.3.1 Big bath“Big Bath” charges are one-time restructuring charge. Current earnings will be decreased by overstating these one-time charges. By reversing the excessive reserve, future earnings will increase.Big bath charges are not always related to restructuring. In April 2001, Cisco Systems Inc. announced charges against earnings of almost $4 billion. The bulk of the charge, $2.5 billion, consisted of an inventory write down. Writing off more than a billion dollars from inventory now means more than a billion dollars of less cost in the future period. This an example of what ultra-conservative accounting in oneperiod makes possible in future periods.3.2 Abuse of materialityAnother area that might be used by accountants to manipulate the earning is the application of materiality principle in preparing the financial statements, this principle is very wide, flexible and has no specific range to determine where the item is material or not. SEC uses the interpretation ruled by the supreme court in identifying what is material; the supreme court has held that a fact is material if there is a substantial likelihood that the fact would have been viewed by reasonable investor as having significan tly altered the “total mix” of information made available (SEC, SAB No. 99, 1999).The SEC has also introduced some considerations for a quantitatively small misstatement of a financial statement item to be material:. whether the misstatement arises from an item capable of precise measurement or whether it arises from an estimate and, if so, the degree of imprecision inherent in the estimate;. whether the misstatement masks a change in earnings or other trends;.whether the misstatement hides a failure to meet analysts’ consensus expectations for the enterprise;. whether the misstatement changes a loss into income or vice versa;. whether the misstatement concerns a segment or other portion of the registrant’s business that has been identified as playing a significant role in the registrant’s operations or profitability; and. whether the misstatement involves concealment of an unlawful transaction.3.3 Cookie jar“Cookie jar” reserve –sometimes labeled rainy day reserve or contingency reserves, in periods of strong financial performance, cookie jar reserve enable to reduce earnings by overstating reserves, overstating expenses, and using one-time write-offs. In periods of weak financial performance, cookie jar reserves can be used to increase earnings by reversing accruals and reserves to reduce current period expenses (Kokoszka, 2003).The most famous example of use of cookie jar reserves is WorldCom Inc. In August 2002, an internal review revealed that the company had $2.5 billion reserves related to litigation, uncollectible and taxes. The company used most of them in a series of so-called reserve reversals in order to have higher earnings.Source: Khaled ElMoatasem Abdelghany,2005. “Measuring the quality of earnings”, Managerial Auditing Journal, vol.20, no.9, pp.1001 – 1015.译文：衡量盈利质量1、引言一般公认会计原则（GAAP）提供准备一定的灵活性的财务报表，给财务经理一定的自由空间进行选择会计政策和方案。

英文小作文及翻译

英文小作文及翻译英文：Recently, I have been asked about my favorite hobby and why I enjoy it so much. Well, I have to say that myfavorite hobby is reading. I love to read books, magazines, and newspapers. Reading is not only a way to gain knowledge and learn new things, but it is also a way to escape from reality and enter into a different world.One of my favorite books is "To Kill a Mockingbird" by Harper Lee. This book is a classic and tells the story of a young girl named Scout and her experiences growing up in the South during the 1930s. The book deals with important themes such as racism, prejudice, and social inequality. I love this book because it is well-written and has a powerful message that still resonates today.Another reason why I enjoy reading is because it helps me to relax and de-stress. After a long day at work orschool, I like to curl up with a good book and forget about my worries for a while. Reading is like a form of therapyfor me.中文：最近，有人问我我的最爱爱好是什么以及为什么我这么喜欢它。

建筑消防安全中英文对照外文翻译文献

建筑消防安全中英文对照外文翻译文献建筑消防安全中英文对照外文翻译文献(文档含英文原文和中文翻译)建筑消防安全中英文对照外文翻译文献原文：Fire Safety Design of Indoor Pedestrian Streets of Large Commercial BuildingAbstractIndoor pedestrian streets in China developed rapidly in recent years. The current national fire safety standards do not give clear requirements on fire protection design. Fire safety design departments have difficulties in controlling the design, so there are many problems in the fire protection design to be solved. Based on structure characteristics and application status of large-scale commercial buildings, focusing on various existing difficulties in the indoor pedestrian streets fire protection design process, this thesis defines indoor pedestrian streets fire design ideas, and puts forward fire safety measures that should be taken in the interior pedestrian streets in the layout, fire separation, fire facilities, etc.Key words:large-scale commercial buildings; indoor pedestrian streets; fire safety measures 1. IntroductionWith the diversification of market demands and diversity of business modes, the traditional commercial buildings for shopping only are gradually transformed into multifunctional large commercial buildings in various forms, which integrate hopping, dining, entertainment, culture, arts and other consumer functions. While the indoor pedestrian streets can not only improve environment application conditions and climate adaptability, but also integrate the space and functions of connected commercial buildings, which greatly improves space efficiency.Indoor pedestrian streets is shown in Fig.1.However, its unique function and structure brings many problems in fire zone separation, evacuation, smoke exhaust and other aspects in fire protection design. Now there is no domestic specific regulation for indoor pedestrian streets design. It is not only a theoretical topic of academic research, but also an urgent practical problem to solve that how to avoid the blindness in fire design of indoor pedestrian streets, proper handling and solving all the process, and ensuring fire safety of indoor pedestrian streets. Combining the problems encountered in engineering practice, I建筑消防安全中英文对照外文翻译文献make analysis on fire design of indoor pedestrian streets and put forward fire prevention measures that should be taken.Fig. 1.Indoor Pedestrian streets2. Difficulties in fire design of indoor pedestrian streetsAs there are entrances set in shops on both sides of indoor pedestrian streets, the customers can flow in the shops through the pedestrian streets. In addition, the commercial buildings on both sides of indoor pedestrian streets vary in forms, with not only small shops in tight rows, but also large supermarkets and main shops, both enclosed space, and open or semi-open circulated space. Therefore, the fire safety design difficulties mainly exist in the following aspects:(1) In accordance with current fire design specifications, indoor pedestrian streets as a limited interior space, the closed space surrounded by buildings should comply with the relevant provisions of the atrium, and fire compartment area should be calculated by overlying the connected areas of upper and lower floors. If using roller shutters or walls to separate fire compartments, it will undoubtedly undermine the effect of architectural design, but not separating will result in over-large compartment area, exceeding regulatory requirements.(2) Evacuation distance from indoor outdoor pedestrian streets to a safe outdoor place often exceeds the specified safe evacuation distance.(3) Fire escapes of the shops are set in the pedestrian streets, and evacuation must be done through the indoor pedestrian streets.(4) The smoke design of current national fire safety design specifications is not applicable for indoor pedestrian streets. Designers often design natural smoke exhaust by referring to specifications on the requirements of atrium natural smoke exhaust, but there are some problems which can not be overlooked: first, due to "laminarization" phenomenon, for the建筑消防安全中英文对照外文翻译文献ceiling with clearance height greater than 12m, whether natural smoke exhaust windows can produce real effects; second, in many cases, indoor pedestrian streets also burdens safe evacuation of the shops , which meets atrium smoke exhaust design requirements of current fire protection standards. Whether it can ensure the evacuation safety of people in indoor pedestrian streets.(5) Although the indoor pedestrian streets is used for people passage,some problems may appear in the operation of commercial buildings: first, various temporary booths or stands set in the indoor pedestrian streets will not only increase the fire load, but also affect the safe evacuation; second, to protect the shopping environment from the outdoor weather conditions, in the course of business operation some commercial buildings open the smoke exhaust outlets and set doors and windows at the entrances and on the top of the indoor pedestrian streets, which changes the conditions of safe evacuation and smoke exhaust, posing a fire hazard.3.Indoor pedestrian streets fire design ideasThe biggest difference of indoor pedestrian streets from the outdoor one lies in the roof, so it does not have equal safety of outdoor street. The people evacuated from the shops on both sides have to pass the pedestrian streets before reaching a safe location outdoors. So pedestrian streets is a transition area and an additional part of the evacuation passage. Ideally, the people in an indoor pedestrian streets can enjoy equal safety conditions of outdoors during evacuation. Therefore, the question whether indoor pedestrian streets can serve as an evacuation safe zone, will directly affect the business layout and building fire safety design. For this purpose, I put forward the following design ideas:(1) Control the fire within the shops, to avoid it spreading to the indoor pedestrian streetsWhen fire occurs in shops on the side, try to control the fire in a small range as possible, in particular, to avoid fire and smoke spreading to the indoor pedestrian streets. Usually this can be done by taking active and passive fire protection measures.Separate fire compartment reasonably.Separate the shops that face the pedestrian streets using certain fire-resistant dividers to separate the fire, to limit the spread of fire within the shop. In the shops, automatic fire alarm system, smoke exhaust system and建筑消防安全中英文对照外文翻译文献automatic sprinkler systems shall be installed to timely detect the fire, control early fire and smoke spread, and limit the spread of fire from the shops into the pedestrian streets.Indoor pedestrian streetss should have sufficient width, to ensure that even though the fire spreads out of the shops, it will not reach the other side of the pedestrian streets.(2) Avoid the pedestrian streets from being the route of fire spreadIn order to avoid indoor pedestrian streetss from being the route of fire spread, ensure that the floor, wall, and ceiling material will not lead to the spread of the fire. Non-combustible material can be considered; load-bearing structure should have sufficient fire resistance to ensure the safety of evacuation and fire fighting and rescue.Measures should be taken to limit the spread of smoke in the pedestrian streets. The ideal condition of smoke control is that, the smoke exhaust systems in the shops can start in time and exhaust the smoke effectively, to prevent the smoke from spreading into the pedestrian streets. However, considering that the fire in the shops may go out of control, or the smoke exhaust systems in the shops do not start in time or start effectively, or the fire uncontrolled by the fire extinguishing system will soon nullify the indoor exhaust system, etc.there are possibilities that the smoke in the shops spreads to the pedestrian streets. And sometimes unavoidably there are small amounts of combustible that can produce smoke when fire occurs, so it is necessary to install smoke exhaust system in the pedestrian streets.To prevent movable combustible in the pedestrian streets, such as holiday decorations, temporary stands,etc.from causing fire, it should be considered to install automatic sprinkler system or automatic scanning and positioning fire extinguishing system in the corridor and larger atrium of the indoor pedestrian streets.(3) Ensure that people within the indoor pedestrian streets can be quickly evacuated to the outsideThe people detained in the shops and pedestrian streets may not be familiar with building and evacuation routes. Even if the building provides relatively safe evacuation routes and fire exits independent of the pedestrian streets, it should also be considered due to unfamiliarity people may evacuate through the pedestrian streets, resulting in extended time of evacuation. Indoor pedestrian streets, after all, does not have the equal safety of outdoors, so measures should be taken in favor of quick evacuation.建筑消防安全中英文对照外文翻译文献The pedestrian streets should not be used for purposes other than human passage. There should be no arrangement of fixed commercial stalls or obstacles impeding the evacuation, and adequate width should be maintained to meet the evacuation needs and to avoid being overcrowded, which will affect the speed of evacuation.If the exit of shop connects directly to the indoor pedestrian streets, and extends to a safe place outside via the pedestrian streets, the distance from the exit of shop to the exit of the pedestrian streets should be controlled without being too long.As a main channel for safe evacuation, the pedestrian streets should have good emergency lighting and evacuation instructions to ensure smooth evacuation in case of fire. For indoor pedestrian streets with more complex or longer evacuation routes, emergency lighting should be strengthened, intelligent evacuation signs should be set, and fire emergency broadcast system should be allocated, to guide the evacuation in order.(4)Create favorable conditions for external fire fighting and rescueEven if the pedestrian streets is equipped with automatic fire extinguishing system, it does not rule out the case for various reasons fire occurs and spreads, which will need fire fighting service and rescue. Basic fire fighting and rescue measures are:Overall planning and rational setting of commercial building’s fire track create favorable external conditions for the fire brigade to perform rescue, and facilitate quick access for fire engines to the inside or fire site of commercial building.If the indoor pedestrian streets is relatively long, indoor pedestrian streets entrances should be set on the first floor at certain intervals for firefi ghters’ access. Fire rescue operation site should be set on the side of the building more than 24m in height, and window entrance for firefighters should be set on each floor on the wall where fire operation is performed. For the convenience of access to water, in addition to setting the fire hydrant within the shops, the fire hydrant and hose reel should also be set up within the pedestrian streets4.Indoor pedestrian streets fire protection measuresEach layer of indoor pedestrian streets, through the atrium gallery and escalator are connected with each other, creating an open, transparent continuous interior space. This open建筑消防安全中英文对照外文翻译文献and transparent settings,the commercial building shopping personnel can easily recognize direction,on emergency evacuation is very beneficial,but also insightful space indoor pedestrian streets has enough smoke storage space, slowing the smoke sedimentation velocity. But because the evacuation through indoor pedestrian streets to via staircases were evacuated, so need to ensure indoor pedestrian streets fire bining the stated fire safety design ideas, I propose the following fire protection measures:4.1. LayoutRational design of indoor pedestrian streets layout has a positive significance in reducing fire hazards to people and property, reducing economic losses and facilitating fire rescue.To reduce fire risk, commercial buildings should not operate or store commodities with fire risk properties classified as A and B, and no food stands should not be set on the pedestrian streets. To prevent the fire in the shops or in the pedestrian streets from spreading to or along the pedestrian streets, the pedestrian streets width shall meet requirements of fire prevention distance, 8m at least. The pedestrian streets should not be longer than 300m. If it is longer than 300m, open passage with width not less than 6m should be set at places within 300m, in order to facilitate the evacuation, and to delay and prevent the spread of fire, working as a fire barrier.The exits of shops on sides should connect directly to the pedestrian streets, and the exits connecting the shops and the pedestrian streets can be designed as fire escapes. The distance from the shop exit to a nearest outdoor place of safety should not be greater than 60m, in order to facilitate safe evacuationLoop fire engine track should be set around the commercial buildings. If there are difficulties, fire engine tracks with width not less than 6m should be set on two long sides of the building. If the length of the build ing’s outer boundary is greater than 150m or the total length is greater than 220m, a track through the building should be set. To facilitate fire engines’ access, do not set obstacles at the entrance of the street, or set seats, landscape, and other facilities in the street. Do not affect fire fighting or the passage of fire engines. Set fire track signs on the ground, in which there should be no obstacles or open doors & windows or steps, etc.建筑消防安全中英文对照外文翻译文献4.2. Fire separation(1) For non-food shops, shop building area should not exceed 300 m2, and the pedestrian streets and shops should be separated with 1.0h window-type spray cooling system protective tempered glass for fire separation; if the building area is more than 300 m2, 2.0h type one should be used.(2) The shop door that opens to the indoor pedestrian streets should be able to automatically shut down when fire occurs, and it should be sealed well to prevent the smoke entering into the interior pedestrian streets. The door should meet the fire resistance of not less than 1.0h.A space no less than 500mm should be left between the top of the door and the ceiling as smoke accumulating space. It is recommended to use a two-way spring door with electromagnetic absorber, so that the doors automatically close in case of emergency power-off due to fire. And ensure that both sides can be opened and automatically closed after opening.(3) The fire resistance of the walls between the shops with building area less than 300m2 should not be lower than 2.0h; for shops greater than 300m2, use walls with fire resistance not less than 3.0h to separate the adjacent shops; the walls should be built to the bottom of the upper floor. The horizontal distance between the door and window openings on both sides of the walls should be no less than 2.0m.(4) Fire damper which can be automatically closed at 70 should be set in the air conditioner and ventilation pipe through the fire wall of the shop, and smoke damper which can be automatically closed at 280 should be set in the smoke exhaust pipe.4.3. Fire fighting facilities(1) Fire extinguishing system: automatic sprinkler system should be set in the pedestrian streets corridor, and fast response sprinklers should be used. For atrium area fixed fire monitor system should be used. Fire hydrant and hose reel should be set at intervals of 50m in the indoor pedestrian streets.(2) Fire detection and alarm system: point-type smoke detectors should be set in the pedestrian streets corridor; beam line smoke detectors can be set at the top of the pedestrian streets.建筑消防安全中英文对照外文翻译文献(3) Smoke system: natural draft system can be used in the pedestrian streets. Sufficient natural draft windows should be arranged in the ceiling, exhausting the smoke in the street timely by reliable linkage starting. The area of natural draft windows should be no less than 20% of the pedestrian streets surface.(4) The emergency lighting and evacuation signs: centralized power and centralized control type should be used. Light-type evacuation signs which can maintain a visual continuity should be set on the ground the evacuation routes of the pedestrian streets. The evacuation signs should use safe voltage, and the intervals of ground evacuation signs should be no greater than 5m.5.ConclusionIndoor pedestrian streets in China developed rapidly in recent years. The current national fire safety standards do not give clear requirements on fire protection design. Fire safety design departments have difficulties in controlling the design , so there are many problems in the fire protection design to be solved. Basically, the proposed fire safety measures are able to meet the current needs of using indoor pedestrian streets, which are also realistic and can provide new ideas for indoor pedestrian streets fire safety design. Only reasonable measures can reduce fire risk, to ensure fire safety of indoor pedestrian streets.Reference[1] GB50016-2006.Code of design on building fire protection and prevention.[2] Fire Bureau of Ministry of Public Security, Handbook of Fire Protection[M]. Science and Technology Publishing of Shanghai.2007.[3] HUO Ran,YUAN,HongYong Performance based fire prevention analysis and design ofbuildings[M]. Science and Technology Publishing of Anhui,2003.[4] NFPA Life Safety Code, NFPA (Fire) 101, National Fire Protean, Association, 2005.译文：大型商业综合体室内步行街消防安全设计建筑消防安全中英文对照外文翻译文献摘要近几年中国的室内步行街发展迅速。

建筑防火中英文对照外文翻译文献

- 1 -中英文对照外文翻译(文档含英文原文和中文翻译)外文文献外文文献: :Designing Against Fire Of BulidingABSTRACT:This paper considers the design of buildings for fire safety. It is found that fire and the associ- ated effects on buildings is significantly different to other forms of loading such as gravity live loads, wind and earthquakes and their respective effects on the building structure. Fire events are derived from the human activities within buildings or from the malfunction of mechanical and electrical equipment provided within buildings to achieve a serviceable environment. It is therefore possible to directly influence the rate of fire starts within buildings by changing human behaviour, improved maintenance and improved design of mechanical and electricalsystems. Furthermore, should a fire develops, it is possible to directly influence the resulting fire severity by the incorporation of fire safety systems such as sprinklers and to provide measures within the building to enable safer egress from the building. The ability to influence the rate of fire starts and the resulting fire severity is unique to the consideration of fire within buildings since other loads such as wind and earthquakes are directly a function of nature. The possible approaches for designing a building for fire safety are presented using an example of a multi-storey building constructed over a railway line. The design of both the transfer structure supporting the building over the railway and the levels above the transfer structure are consideredin the context of current regulatory requirements. The principles and assumptions associ- ated with various approaches are discussed.1 INTRODUCTIONOther papers presented in this series consider the design of buildings for gravity loads, wind and earthquakes.The design of buildings against such load effects is to a large extent covered by engineering based standards referenced by the building regulations. This is not the case, to nearly the same extent, in the case of fire. Rather, it is building regulations such as the Building Code of Australia (BCA) that directly specify most of the requirements for fire safety of buildings with reference being made to Standards such as AS3600 or AS4100 for methods for determining the fire resistance of structural elements.The purpose of this paper is to consider the design of buildings for fire safety from an engineering perspective (as is currently done for other loads such as wind or earthquakes), whilst at the same time,putting such approaches in the context of the current regulatory requirements.At the outset,it needs to be noted that designing a building for fire safety is far more than simply considering the building structure and whether it has sufficient structural adequacy.This is because fires can have a direct influence on occupants via smoke and heat and can grow in size and severity unlike other effects imposed on the building. Notwithstanding these comments, the focus of this paper will be largely on design issues associated with the building structure.Two situations associated with a building are used for the purpose of discussion. The multi-storey office building shown in Figure 1 is supported by a transfer structure that spans over a set of railway tracks. It is assumed that a wide range of rail traffic utilises these tracks including freight and diesel locomotives. The first situation to be considered from a fire safety perspective is the transfer structure.This is termed Situation 1 and the key questions are: what level of fire resistance is required for this transfer structure and how can this be determined? This situation has been chosen since it clearly falls outside the normal regulatory scope of most build-ing regulations. An engineering solution, rather than a prescriptive one is required. The second fire situation (termed Situation 2) corresponds to a fire within the office levels of the building and is covered by building regulations. This situation is chosen because it will enable a discussion of engineering approaches and how these interface with the building regulations regulations––since both engineering and prescriptive solutions are possible.2 UNIQUENESS OF FIRE2.1 Introduction Wind and earthquakes can be considered to b Wind and earthquakes can be considered to be “natural” phenomena o e “natural” phenomena o e “natural” phenomena over which designers ver which designers have no control except perhaps to choose the location of buildings more carefully on the basis of historical records and to design building to resist sufficiently high loads or accelerations for the particular location. Dead and live loads in buildings are the result of gravity. All of these loads are variable and it is possible (although generally unlikely) that the loads may exceed the resistance of the critical structural members resulting in structural failure.The nature and influence of fires in buildings are quite different to those associated with other“loads” to which a building may be subjected to. The essential differences are described in the following sections.2.2 Origin of FireIn most situations (ignoring bush fires), fire originates from human activities within the building or the malfunction of equipment placed within the building to provide a serviceable environment. It follows therefore that it is possible to influence the rate of fire starts by influencing human behaviour, limiting and monitoring human behaviour and improving the design of equipment and its maintenance. This is not the case for the usual loads applied to a building.2.3 Ability to InfluenceSince wind and earthquake are directly functions of nature, it is not possible to influence such events to any extent. One has to anticipate them and design accordingly. It may be possibleto influence the level of live load in a building by conducting audits and placing restrictions on contents. However, in the case of a fire start, there are many factors that can be brought to bear to influence the ultimate size of the fire and its effect within the building. It is known that occupants within a building will often detect a fire and deal with it before it reaches a sig- nificant size. It is estimated that less than one fire in five (Favre, 1996) results in a call to the fire brigade and for fires reported to the fire brigade, the majority will be limited to the room of fire origin. Inoc- cupied spaces, olfactory cues (smell) provide powerful evidence of the presence of even a small fire. The addition of a functional smoke detection system will further improve the likelihood of detection and of action being taken by the occupants.Fire fighting equipment, such as extinguishers and hose reels, is generally provided within buildings for the use of occupants and many organisations provide training for staff in respect ofthe use of such equipment.The growth of a fire can also be limited by automatic extinguishing systems such as sprinklers, which can be designed to have high levels of effectiveness.Fires can also be limited by the fire brigade depending on the size and location of the fire at the time of arrival.2.4 Effects of FireThe structural elements in the vicinity of the fire will experience the effects of heat. The temperatures within the structural elements will increase with time of exposure to the fire, the rate of temperature rise being dictated by the thermal resistance of the structural element and the severity of the fire. The increase in temperatures within a member will result in both thermal expansion and,eventually,a reduction in the structural resistance of the member. Differential thermal expansion will lead to bowing of a member. Significant axial expansion willbe accommodated in steel members by either overall or local buckling or yielding of local- ised regions. These effects will be detrimental for columns but for beams forming part of a floorsystem may assist in the development of other load resisting mechanisms (see Section 4.3.5).With the exception of the development of forces due to restraint of thermal expansion, fire does not impose loads on the structure but rather reduces stiffness and strength. Such effects are not instantaneous but are a function of time and this is different to the effects of loads such as earthquake and wind that are more or less instantaneous.Heating effects associated with a fire will not be significant or the rate of loss of capacity will be slowed if:(a) the fire is extinguished (e.g. an effective sprinkler system)(b) the fire is of insufficient severity –– insufficient fuel, and/or(b) the fire is of insufficient severity(c)the structural elements have sufficient thermal mass and/or insulation to slow the rise in internal temperatureFire protection measures such as providing sufficient axis distance and dimensions for concrete elements, and sufficient insulation thickness for steel elements are examples of (c). These are illustrated in Figure 2.The two situations described in the introduction are now considered.3 FIRE WITHIN BUILDINGS3.1 Fire Safety ConsiderationsThe implications of fire within the occupied parts of the office building (Figure 1) (Situation 2) are now considered. Fire statistics for office buildings show that about one fatality is expected in an office building for every 1000 fires reported to the fire brigade. This is an orderof magnitude less than the fatality rate associated with apartment buildings. More than two thirdsof fires occur during occupied hours and this is due to the greater human activity and the greater use of services within the building. It is twice as likely that a fire that commences out of normal working hours will extend beyond the enclosure of fire origin.A relatively small fire can generate large quantities of smoke within the floor of fire origin.If the floor is of open-plan construction with few partitions, the presence of a fire during normal occupied hours is almost certain to be detected through the observation of smoke on the floor. The presence of full height partitions across the floor will slow the spread of smoke and possibly also the speed at which the occupants detect the fire. Any measures aimed at improving housekeeping, fire awareness and fire response will be beneficial in reducing the likelihood of major fires during occupied hours.For multi-storey buildings, smoke detection systems and alarms are often provided to give “automatic” detection and warning to the occupants. An alarm signal is also transm itted to the fire brigade.Should the fire not be able to be controlled by the occupants on the fire floor, they will need to leave the floor of fire origin via the stairs. Stair enclosures may be designed to be fire-resistant but this may not be sufficient to keep the smoke out of the stairs. Many buildings incorporate stair pressurisation systems whereby positive airflow is introduced into the stairs upon detection of smoke within the building. However, this increases the forces required to open the stair doors and makes it increasingly difficult to access the stairs. It is quite likely that excessive door opening forces will exist(Fazio et al,2006)From a fire perspective, it is common to consider that a building consists of enclosures formed by the presence of walls and floors.An enclosure that has sufficiently fire-resistant boundaries (i.e. walls and floors) is considered to constitute a fire compartment and to be capableof limiting the spread of fire to an adjacent compartment. However, the ability of such boundariesto restrict the spread of fire can be severely limited by the need to provide natural lighting (windows)and access openings between the adjacent compartments (doors and stairs). Fire spread via the external openings (windows) is a distinct possibility given a fully developed fire. Limit- ing the window sizes and geometry can reduce but not eliminate the possibility of vertical fire spread.By far the most effective measure in limiting fire spread, other than the presence of occupants, is an effective sprinkler system that delivers water to a growing fire rapidly reducing the heat being generated and virtually extinguishing it.3.2 Estimating Fire SeverityIn the absence of measures to extinguish developing fires, or should such systems fail; severe fires can develop within buildings.In fire engineering literature, the term “fire load” refers to the quantity of combustibles within an enclosure and not the loads (forces) applied to the structure during a fire. Similarly, fire load density refers to the quantity of fuel per unit area. It is normally expressed in terms of MJ/m2or kg/m 2of wood equivalent. Surveys of combustibles for various occupancies (i.e offices, retail,hospitals, warehouses, etc)have been undertaken and a good summary of the available data is given in FCRC (1999). As would be expected, the fire load density is highly variable. Publications such as the International Fire Engineering Guidelines (2005) give fire load data in terms of the mean and 80th percentile.The latter level of fire load density is sometimes taken asthe characteristic fire load density and is sometimes taken as being distributed according to a Gumbel distribution (Schleich et al, 1999).The rate at which heat is released within an enclosure is termed the heat release rate (HRR) and normally expressed in megawatts (MW). The application of sufficient heat to a combustible material results in the generation of gases some of which are combustible. This process is called pyrolisation.Upon coming into contact with sufficient oxygen these gases ignite generating heat. The rate of burning(and therefore of heat generation) is therefore dependent on the flow of air to the gases generated by the pyrolising fuel.This flow is influenced by the shape of the enclosure (aspect ratio), and the position and size of any potential openings. It is found from experiments with single openings in approximately cubic enclosures that the rate of burning is directly proportional to A h where A is the area of the opening and h is the opening height. It is known that for deep enclosures with single openings that burning will occur initially closest to the opening moving back into the enclosure once the fuel closest to the opening is consumed (Thomas et al, 2005). Significant temperature variations throughout such enclosures can be expected.The use of the word ‘opening’ in relation to real building enclosures refers to any openings present around the walls including doors that are left open and any windows containing non fire-resistant glass.It is presumed that such glass breaks in the event of development of a significant fire. If the windows could be prevented from breaking and other sources of air to the enclosure limited, then the fire would be prevented from becoming a severe fire.V arious methods have been developed for determining the potential severity of a fire within an enclosure.These are described in SFPE (2004). The predictions of these methods are variable and are mostly based on estimating a representative heat release rate (HRR) and the proportion of total fuel ς likely to be consumed during the primary burning stage (Figure 4). Further studies of enclosure fires are required to assist with the development of improved models,as the behaviour is very complex.3.3 Role of the Building StructureIf the design objectives are to provide an adequate level of safety for the occupants and protection of adjacent properties from damage, then the structural adequacy of the building in fire need only be sufficient to allow the occupants to exit the building and for the building to ultimately deform in a way that does not lead to damage or fire spread to a building located on an adjacent site.These objectives are those associated with most building regulations including the Building Code of Australia (BCA). There could be other objectives including protection of the building against significant damage. In considering these various objectives, the following should be taken into account when considering the fire resistance of the building structure.3.3.1 Non-Structural ConsequencesSince fire can produce smoke and flame, it is important to ask whether these outcomes will threaten life safety within other parts of the building before the building is compromised by a lossof structural adequacy? Is search and rescue by the fire brigade not feasible given the likely extent of smoke? Will the loss of use of the building due to a severe fire result in major property and income loss? If the answer to these questions is in the affirmative, then it may be necessary to minimise the occurrence of a significant fire rather than simply assuming that the building structure needs to be designed for high levels of fire resistance. A low-rise shopping centre with levels interconnected by large voids is an example of such a situation.3.3.2 Other Fire Safety SystemsThe presence of other systems (e.g. sprinklers) within the building to minimise the occurrence of a serious fire can greatly reduce the need for the structural elements to have high levels of fire resistance. In this regard, the uncertainties of all fire-safety systems need to be considered. Irrespective of whether the fire safety system is the sprinkler system, stair pressurisation, compartmentation or the system giving the structure a fire-resistance level (e.g. concrete cover), there is an uncertainty of performance. Uncertainty data is available for sprinkler systems(because it is relatively easy to collect) but is not readily available for the other fire safety systems. This sometimes results in the designers and building regulators considering that only sprinkler systems are subject to uncertainty. In reality, it would appear that sprinklers systems have a high level of performance and can be designed to have very high levels of reliability.3.3.3 Height of BuildingIt takes longer for a tall building to be evacuated than a short building and therefore the structure of a tall building may need to have a higher level of fire resistance. The implications of collapse of tall buildings on adjacent properties are also greater than for buildings of only several storeys.3.3.4 Limited Extent of BurningIf the likely extent of burning is small in comparison with the plan area of the building, then the fire cannot have a significant impact on the overall stability of the building structure. Examples of situations where this is the case are open-deck carparks and very large area building such as shopping complexes where the fire-effected part is likely to be small in relation to area of the building floor plan.3.3.5 Behaviour of Floor ElementsThe effect of real fires on composite and concrete floors continues to be a subject of much research.Experimental testing at Cardington demonstrated that when parts of a composite floor are subject to heating, large displacement behaviour can develop that greatly assists the load carrying capacity of the floor beyond that which would predicted by considering only the behaviour of the beams and slabs in isolation.These situations have been analysed by both yield line methods that take into account the effects of membrane forces (Bailey, 2004) and finite element techniques. In essence, the methods illustrate that it is not necessary to insulate all structural steel elements in a composite floor to achieve high levels of fire resistance.This work also demonstrated that exposure of a composite floor having unprotected steel beams, to a localised fire, will not result in failure of the floor.A similar real fire test on a multistory reinforced concrete building demonstrated that the real structural behaviour in fire was significantly different to that expected using small displacement theory as for normal tempera- ture design (Bailey, 2002) with the performance being superior than that predicted by considering isolated member behaviour.3.4 Prescriptive Approach to DesignThe building regulations of most countries provide prescriptive requirements for the design of buildings for fire.These requirements are generally not subject to interpretation and compliance with them makes for simpler design approvalapproval––although not necessarily the most cost-effective designs.These provisions are often termed deemed-to-satisfy (DTS) provisions. Allcovered––the provision of emergency exits, aspects of designing buildings for fire safety are coveredspacings between buildings, occupant fire fighting measures, detection and alarms, measures for automatic fire suppression, air and smoke handling requirements and last, but not least, requirements for compartmentation and fire resistance levels for structural members. However, there is little evidence that the requirements have been developed from a systematic evaluation of fire safety. Rather it would appear that many of the requirements have been added one to anotherto deal with another fire incident or to incorporate a new form of technology. There does not appear to have been any real attempt to determine which provision have the most significant influence on fire safety and whether some of the former provisions could be modified.The FRL requirements specified in the DTS provisions are traditionally considered to result in member resistances that will only rarely experience failure in the event of a fire.This is why it is acceptable to use the above arbitrary point in time load combination for assessing members in fire. There have been attempts to evaluate the various deemed-to-satisfy provisions (particularly the fire- resistance requirements)from a fire-engineering perspective taking into account the possible variations in enclosure geometry, opening sizes and fire load (see FCRC, 1999).One of the outcomes of this evaluation was the recognition that deemed-to- satisfy provisions necessarily cover the broad range of buildings and thus must, on average, be quite onerous because of the magnitude of the above variations.It should be noted that the DTS provisions assume that compartmentation works and that fire is limited to a single compartment. This means that fire is normally only considered to exist at one level. Thus floors are assumed to be heated from below and columns only over one storey height.3.5 Performance-Based DesignAn approach that offers substantial benefits for individual buildings is the move towards performance-based regulations. This is permitted by regulations such as the BCA which state thata designer must demonstrate that the particular building will achieve the relevant performance requirements. The prescriptive provisions (i.e. the DTS provisions) are presumed to achieve these requirements. It is necessary to show that any building that does not conform to the DTS provisions will achieve the performance requirements.But what are the performance requirements? Most often the specified performance is simplya set of performance statements (such as with the Building Code of Australia)with no quantitative level given. Therefore, although these statements remind the designer of the key elements of design, they do not, in themselves, provide any measure against which to determine whether the design is adequately safe.Possible acceptance criteria are now considered.3.5.1 Acceptance CriteriaSome guidance as to the basis for acceptable designs is given in regulations such as the BCA. These and other possible bases are now considered in principle.(i)compare the levels of safety (with respect to achieving each of the design objectives) of the proposed alternative solution with those asso- ciated with a corresponding DTS solution for the building.This comparison may be done on either a qualitative or qualitative risk basis or perhaps a combination. In this case, the basis for comparison is an acceptable DTS solution. Such an approach requires a “holistic” approach to safety whereby all aspects relevant to safety, including the structure, are considered. This is, by far, the most common basis for acceptance.(ii)undertake a probabilistic risk assessment and show that the risk associated with the proposed design is less than that associated with common societal activities such as using pub lic transport. Undertaking a full probabilistic risk assessment can be very difficult for all but the simplest situations.Assuming that such an assessment is undertaken it will be necessary for the stakeholders to accept the nominated level of acceptable risk. Again, this requires a “holistic” approach to fire safety.(iii) a design is presented where it is demonstrated that all reasonable measures have been adopted to manage the risks and that any possible measures that have not been adopted will have negligible effect on the risk of not achieving the design objectives.(iv) as far as the building structure is concerned,benchmark the acceptable probability of failure in fire against that for normal temperature design. This is similar to the approach used when considering Building Situation 1 but only considers the building structure and not the effects of flame or smoke spread. It is not a holistic approach to fire safety.Finally, the questions of arson and terrorism must be considered. Deliberate acts of fire initiation range from relatively minor incidents to acts of mass destruction.Acts of arson are well within the accepted range of fire events experienced by build- ings(e.g. 8% of fire starts in offices are deemed "suspicious"). The simplest act is to use a small heat source to start a fire. The resulting fire will develop slowly in one location within the building and will most probably be controlled by the various fire- safety systems within the building. The outcome is likely to be the same even if an accelerant is used to assist fire spread.An important illustration of this occurred during the race riots in Los Angeles in 1992 (Hart 1992) when fires were started in many buildings often at multiple locations. In the case of buildings with sprinkler systems,the damage was limited and the fires significantly controlled.Although the intent was to destroy the buildings,the fire-safety systems were able to limit the resulting fires. Security measures are provided with systems such as sprinkler systems and include:- locking of valves- anti-tamper monitoring- location of valves in secure locationsFurthermore, access to significant buildings is often restricted by security measures.The very fact that the above steps have been taken demonstrates that acts of destruction within buildings are considered although most acts of arson do not involve any attempt to disable the fire-safety systems.At the one end of the spectrum is "simple" arson and at the other end, extremely rare acts where attempts are made to destroy the fire-safety systems along with substantial parts of thebuilding.This can be only achieved through massive impact or the use of explosives. The latter may be achieved through explosives being introduced into the building or from outside by missile attack.The former could result from missile attack or from the collision of a large aircraft. The greater the destructiveness of the act,the greater the means and knowledge required. Conversely, the more extreme the act, the less confidence there can be in designing against such an act. This is because the more extreme the event, the harder it is to predict precisely and the less understood will be its effects. The important point to recognise is that if sufficient means can be assembled, then it will always be possible to overcome a particular building design.Thus these acts are completely different to the other loadings to which a building is subjected such as wind,earthquake and gravity loading. This is because such acts of destruction are the work of intelligent beings and take into account the characteristics of the target.Should high-rise buildings be designed for given terrorist activities,then terrorists will simply use greater means to achieve the end result.For example, if buildings were designed to resist the impact effects from a certain size aircraft, then the use of a larger aircraft or more than one aircraft could still achieve destruction of the building. An appropriate strategy is therefore to minimise the likelihood of means of mass destruction getting into the hands of persons intent on such acts. This is not an engineering solution associated with the building structure.It should not be assumed that structural solutions are always the most appropriate, or indeed, possible.In the same way, aircrafts are not designed to survive a major fire or a crash landing but steps are taken to minimise the likelihood of either occurrence.The mobilization of large quantities of fire load (the normal combustibles on the floors) simultaneously on numerous levels throughout a building is well outside fire situations envisaged by current fire test standards and prescriptive regulations. Risk management measures to avoid such a possibility must be considered.4 CONCLUSIONSificantly from other “loads” such as wind, live load and earthquakes in significantlyFire differs signrespect of its origin and its effects.Due to the fact that fire originates from human activities or equipment installed within buildings, it is possible to directly influence the potential effects on the building by reducing the rate of fire starts and providing measures to directly limit fire severity.The design of buildings for fire safety is mostly achieved by following the prescriptive requirements of building codes such as the BCA. For situations that fall outside of the scope of such regulations, or where proposed designs are not in accordance with the prescriptive requirements, it is possible to undertake performance-based fire engineering designs.However,。

道路与桥梁工程中英文对照外文翻译文献

中英文对照外文翻译(文档含英文原文和中文翻译)Bridge research in EuropeA brief outline is given of the development of the European Union, together with the research platform in Europe. The special case of post-tensioned bridges in the UK is discussed. In order to illustrate the type of European research being undertaken, an example is given from the University of Edinburgh portfolio: relating to the identification of voids in post-tensioned concrete bridges using digital impulse radar.IntroductionThe challenge in any research arena is to harness the findings of different research groups to identify a coherent mass of data, which enables research and practice to be better focused. A particular challenge exists with respect to Europe where language barriers are inevitably very significant. The European Community was formed in the 1960s based upon a political will within continental Europe to avoid the European civil wars, which developed into World War 2 from 1939 to 1945. The strong political motivation formed the original community of which Britain was not a member. Many of the continental countries saw Britain’s interest as being purelyeconomic. The 1970s saw Britain joining what was then the European Economic Community (EEC) and the 1990s has seen the widening of the community to a European Union, EU, with certain political goals together with the objective of a common European currency.Notwithstanding these financial and political developments, civil engineering and bridge engineering in particular have found great difficulty in forming any kind of common thread. Indeed the educational systems for University training are quite different between Britain and the European continental countries. The formation of the EU funding schemes —e.g. Socrates, Brite Euram and other programs have helped significantly. The Socrates scheme is based upon the exchange of students between Universities in different member states. The Brite Euram scheme has involved technical research grants given to consortia of academics and industrial partners within a number of the states— a Brite Euram bid would normally be led by an industrialist.In terms of dissemination of knowledge, two quite different strands appear to have emerged. The UK and the USA have concentrated primarily upon disseminating basic research in refereed journal publications: ASCE, ICE and other journals. Whereas the continental Europeans have frequently disseminated basic research at conferences where the circulation of the proceedings is restricted.Additionally, language barriers have proved to be very difficult to break down. In countries where English is a strong second language there has been enthusiastic participation in international conferences based within continental Europe —e.g. Germany, Italy, Belgium, The Netherlands and Switzerland. However, countries where English is not a strong second language have been hesitant participants }—e.g. France.European researchExamples of research relating to bridges in Europe can be divided into three types of structure:Masonry arch bridgesBritain has the largest stock of masonry arch bridges. In certain regions of the UK up to 60% of the road bridges are historic stone masonry arch bridges originally constructed for horse drawn traffic. This is less common in other parts of Europe as many of these bridges were destroyed during World War 2.Concrete bridgesA large stock of concrete bridges was constructed during the 1950s, 1960s and 1970s. At the time, these structures were seen as maintenance free. Europe also has a large number of post-tensioned concrete bridges with steel tendon ducts preventing radar inspection. This is a particular problem in France and the UK.Steel bridgesSteel bridges went out of fashion in the UK due to their need for maintenance as perceived in the 1960s and 1970s. However, they have been used for long span and rail bridges, and they are now returning to fashion for motorway widening schemes in the UK.Research activity in EuropeIt gives an indication certain areas of expertise and work being undertaken in Europe, but is by no means exhaustive.In order to illustrate the type of European research being undertaken, an example is given from the University of Edinburgh portfolio. The example relates to the identification of voids in post-tensioned concrete bridges, using digital impulse radar.Post-tensioned concrete rail bridge analysisOve Arup and Partners carried out an inspection and assessment of the superstructure of a 160 m long post-tensioned, segmental railway bridge in Manchester to determine its load-carrying capacity prior to a transfer of ownership, for use in the Metrolink light rail system..Particular attention was paid to the integrity of its post-tensioned steel elements. Physical inspection, non-destructive radar testing and other exploratory methods were used to investigate for possible weaknesses in the bridge.Since the sudden collapse of Ynys-y-Gwas Bridge in Wales, UK in 1985, there has been concern about the long-term integrity of segmental, post-tensioned concrete bridges which may b e prone to ‘brittle’ failure without warning. The corrosion protection of the post-tensioned steel cables, where they pass through joints between the segments, has been identified as a major factor affecting the long-term durability and consequent strength of this type of bridge. The identification of voids in grouted tendon ducts at vulnerable positions is recognized as an important step in the detection of such corrosion.Description of bridgeGeneral arrangementBesses o’ th’ Barn Bridge is a 160 m long, three span, segmental, post-tensionedconcrete railway bridge built in 1969. The main span of 90 m crosses over both the M62 motorway and A665 Bury to Prestwick Road. Minimum headroom is 5.18 m from the A665 and the M62 is cleared by approx 12.5 m.The superstructure consists of a central hollow trapezoidal concrete box section 6.7 m high and 4 m wide. The majority of the south and central spans are constructed using 1.27 m long pre-cast concrete trapezoidal box units, post-tensioned together. This box section supports the in site concrete transverse cantilever slabs at bottom flange level, which carry the rail tracks and ballast.The center and south span sections are of post-tensioned construction. These post-tensioned sections have five types of pre-stressing:1. Longitudinal tendons in grouted ducts within the top and bottom flanges.2. Longitudinal internal draped tendons located alongside the webs. These are deflected at internal diaphragm positions and are encased in in site concrete.3. Longitudinal macalloy bars in the transverse cantilever slabs in the central span .4. Vertical macalloy bars in the 229 mm wide webs to enhance shear capacity.5. Transverse macalloy bars through the bottom flange to support the transverse cantilever slabs.Segmental constructionThe pre-cast segmental system of construction used for the south and center span sections was an alternative method proposed by the contractor. Current thinking suggests that such a form of construction can lead to ‘brittle’ failure of the ent ire structure without warning due to corrosion of tendons across a construction joint，The original design concept had been for in site concrete construction.Inspection and assessmentInspectionInspection work was undertaken in a number of phases and was linked with the testing required for the structure. The initial inspections recorded a number of visible problems including:Defective waterproofing on the exposed surface of the top flange.Water trapped in the internal space of the hollow box with depths up to 300 mm.Various drainage problems at joints and abutments.Longitudinal cracking of the exposed soffit of the central span.Longitudinal cracking on sides of the top flange of the pre-stressed sections.Widespread sapling on some in site concrete surfaces with exposed rusting reinforcement.AssessmentThe subject of an earlier paper, the objectives of the assessment were:Estimate the present load-carrying capacity.Identify any structural deficiencies in the original design.Determine reasons for existing problems identified by the inspection.Conclusion to the inspection and assessmentFollowing the inspection and the analytical assessment one major element of doubt still existed. This concerned the condition of the embedded pre-stressing wires, strands, cables or bars. For the purpose of structural analysis these elements、had been assumed to be sound. However, due to the very high forces involved,、a risk to the structure, caused by corrosion to these primary elements, was identified.The initial recommendations which completed the first phase of the assessment were:1. Carry out detailed material testing to determine the condition of hidden structural elements, in particularthe grouted post-tensioned steel cables.2. Conduct concrete durability tests.3. Undertake repairs to defective waterproofing and surface defects in concrete.Testing proceduresNon-destructi v e radar testingDuring the first phase investigation at a joint between pre-cast deck segments the observation of a void in a post-tensioned cable duct gave rise to serious concern about corrosion and the integrity of the pre-stress. However, the extent of this problem was extremely difficult to determine. The bridge contains 93 joints with an average of 24 cables passing through each joint, i.e. there were approx. 2200 positions where investigations could be carried out. A typical section through such a joint is that the 24 draped tendons within the spine did not give rise to concern because these were protected by in site concrete poured without joints after the cables had been stressed.As it was clearly impractical to consider physically exposing all tendon/joint intersections, radar was used to investigate a large numbers of tendons and hence locate duct voids within a modest timescale. It was fortunate that the corrugated steel ducts around the tendons were discontinuous through the joints which allowed theradar to detect the tendons and voids. The problem, however, was still highly complex due to the high density of other steel elements which could interfere with the radar signals and the fact that the area of interest was at most 102 mm wide and embedded between 150 mm and 800 mm deep in thick concrete slabs.Trial radar investigations.Three companies were invited to visit the bridge and conduct a trial investigation. One company decided not to proceed. The remaining two were given 2 weeks to mobilize, test and report. Their results were then compared with physical explorations.To make the comparisons, observation holes were drilled vertically downwards into the ducts at a selection of 10 locations which included several where voids were predicted and several where the ducts were predicted to be fully grouted. A 25-mm diameter hole was required in order to facilitate use of the chosen horoscope. The results from the University of Edinburgh yielded an accuracy of around 60%.Main radar sur v ey, horoscope verification of v oids.Having completed a radar survey of the total structure, a baroscopic was then used to investigate all predicted voids and in more than 60% of cases this gave a clear confirmation of the radar findings. In several other cases some evidence of honeycombing in the in site stitch concrete above the duct was found.When viewing voids through the baroscopic, however, it proved impossible to determine their actual size or how far they extended along the tendon ducts although they only appeared to occupy less than the top 25% of the duct diameter. Most of these voids, in fact, were smaller than the diameter of the flexible baroscopic being used (approximately 9 mm) and were seen between the horizontal top surface of the grout and the curved upper limit of the duct. In a very few cases the tops of the pre-stressing strands were visible above the grout but no sign of any trapped water was seen. It was not possible, using the baroscopic, to see whether those cables were corroded.Digital radar testingThe test method involved exciting the joints using radio frequency radar antenna: 1 GHz, 900 MHz and 500 MHz. The highest frequency gives the highest resolution but has shallow depth penetration in the concrete. The lowest frequency gives the greatest depth penetration but yields lower resolution.The data collected on the radar sweeps were recorded on a GSSI SIR System 10.This system involves radar pulsing and recording. The data from the antenna is transformed from an analogue signal to a digital signal using a 16-bit analogue digital converter giving a very high resolution for subsequent data processing. The data is displayed on site on a high-resolution color monitor. Following visual inspection it is then stored digitally on a 2.3-gigabyte tape for subsequent analysis and signal processing. The tape first of all records a ‘header’ noting the digital radar settings together with the trace number prior to recording the actual data. When the data is played back, one is able to clearly identify all the relevant settings —making for accurate and reliable data reproduction.At particular locations along the traces, the trace was marked using a marker switch on the recording unit or the antenna.All the digital records were subsequently downloaded at the University’s NDT laboratory on to a micro-computer.（The raw data prior to processing consumed 35 megabytes of digital data.）Post-processing was undertaken using sophisticated signal processing software. Techniques available for the analysis include changing the color transform and changing the scales from linear to a skewed distribution in order to highlight、突出certain features. Also, the color transforms could be changed to highlight phase changes. In addition to these color transform facilities, sophisticated horizontal and vertical filtering procedures are available. Using a large screen monitor it is possible to display in split screens the raw data and the transformed processed data. Thus one is able to get an accurate indication of the processing which has taken place. The computer screen displays the time domain calibrations of the reflected signals on the vertical axis.A further facility of the software was the ability to display the individual radar pulses as time domain wiggle plots. This was a particularly valuable feature when looking at individual records in the vicinity of the tendons.Interpretation of findingsA full analysis of findings is given elsewhere, Essentially the digitized radar plots were transformed to color line scans and where double phase shifts were identified in the joints, then voiding was diagnosed.Conclusions1. An outline of the bridge research platform in Europe is given.2. The use of impulse radar has contributed considerably to the level of confidence in the assessment of the Besses o’ th’ Barn Rail Bridge.3. The radar investigations revealed extensive voiding within the post-tensioned cable ducts. However, no sign of corrosion on the stressing wires had been found except for the very first investigation.欧洲桥梁研究欧洲联盟共同的研究平台诞生于欧洲联盟。

企业社会责任英文原文加翻译

企业社会责任英文原文加翻译一(英文原文Moral Discourse and Corporate Social Responsibility ReportingBy MaryAnn Reynolds, Kristi YuthasABSTRACTThis paper examines voluntary corporate social responsibility (CSR) reporting as a form of moral discourse. It explores how alternative stakeholder perspectives lead to differing perceptions of the process and content of responsible reporting. We contrast traditional stakeholder theory, which views stakeholders as external parties having a social contract with corporations, with an emerging perspective, which views interaction among corporations and constituents as relational in nature. This moves the stakeholder from an external entity to one thatis integral to corporate activity. We explore how these alternative stakeholder perspectives give rise to different normative demands for stakeholder engagement, managerial processes, and communication. We discuss models of CSR reporting and accountability: EMAS, the ISO 14000 series, SA8000, AA1000, the Global Reporting Initiative, and the Copenhagen Charter. We explore how these models relate to the stakeholder philosophies and find that they are largely consistent with the traditional atomistic view but fall far short of the demands for moral engagement prescribed by a relational stakeholder perspective. Adopting a relational view requires stakeholder engagement not only inprescribing reporting requiremenu, but also in discourse relating to core aspects of the corporation such as mission,values,and management systems, Habermas' theory of communicative action provides guidelinesfor engaging stakeholders in this moral discourse.KEY WORDS: stakeholder engagement, stakeholder reporting, relational stakeholder perspective, corporate social responsibility,Theoryof Communicative Action,discourse ethicsIntroductionThroughout this paper, we use Habermas' theory of communicative action (1984, 1987, 1990) as a means through which to critique current approaches corporate the degree menu forsocial responsibility reporting in terms to which these reports embody require moral discourse. We provide a brief introduction to key elements of the theory and ground it in social theory. We then discuss the details as they apply to CSR reporting.Our analysis is conducted in two stages, relying on different portions ofHabermas' theory. In the first part, we examine the conditions that allow for basic communicative understanding. These conditions are the unspoken assumptions underlying communication. In normal communication, four basic universal assumptions are made: that the speaker is telling the truth, that he means what he says, and that what he says is appropriate in its context, and that it is understandable to the listener. In the first part of the paper, we show how models orframeworks for CSR reporting, taken together, address these assumptions and contribute to the effectiveness of CSR reports as a form of communication.In the second part of our analysis, we rely upon the ethical aspects of Habermas' theory as a means through which to provide a normative critique of the body of CSR reporting frameworks. The theory of communicative action suggests that social progress can be accomplished through rational discourse under specific conditions. The discourse must be inclusive, democratic, and free of power asymmetries. Apel (1980) has suggested that the ethical nature of an agreement derives from theprocess used to arrive at that agreement (rather than universal or externally-imposed ethical standards).We use Habermas' principles as a means to examine the extent to corporate communication is reflective of moral discourse.We find that while the frameworks generally promote stakeholder consultation,they fall short of providing other conditions needed for moral discourse. In particular, they fail to provide mechanisms that allow stakeholders with differing resources to participate democratically in discourse.The paper is organized as follows. First,we introduce social responsibility and corporate disclosure concepts related to CSRreporting.Next,we explore widely-used frameworks associated with corporate accountability in the CSR realm. Then, as noted above, we provide a 2-part analysis of how concepts from Habermas' theory of communicative action are currently realized in guidance provided by CSR reporting models. We close with concluding rem arks.Background: social responsibility and corporate disclosureCorporate social responsibility is addressed in current business, accounting and ethics literature. The issue was widely discussed in the seventies and early eighties and then dropped out of sight. The current re-energized focus includes social, environmental and ethical reporting by corporations. The notion of corporate social disclosure arises from a view of social theory which holds that the corporation owes a duty to the society; or has a social contract. One widely cited quotation comes from Shocker and Sethi (1974, p.67):"Any social institution一and business in no exception一operates in societyvia a social contract, expressed or implied, whereby its survival and growth are based on:1 .The delivery of some socially desirable ends to society ingeneral and,2. The distribution of economic, social or political benefits to groups from which it derives its power.In a dnamic society, neither the sources of institutional power nor the needs for its services are permanent. Therefore, an institution must constantly meet the twintests of legitimacy and relevance by demonstrafing that society requires its services and that the groups benefiting from its rewards have society's approval."Carroll and Bucholtz offer a four part definition of corporatesocial responsibility, "The social responsibility of business encompasses the economic, legal,ethical, and discretionary (philanthropic) expectadons that society has of organizations at a given point in time (2006, p. 35)." This definition reflects current thinking on corporate social responsibility and acknowledges the need to note shifts in social environment, these may be social, legal, or political.Corporate investors are questioning the adequacy of this communication approach and have called for increased reporting on issues of broad societal interest. Presently it is estimated that trillions of dollars are allocated to investments based on some social criteria (Sparkes and Cowton, 2004). Confulion may arise with the lack of comparable reporting.Implementable guidelines have consequently been developed by groups proposing models or frameworks for reporting (communicating) and auditing (verifying). Leading examples in order they were first issued are:EMAS (European, particularly German environmental management and audit)ISO 14001(Internationally recognized environmental managementcertification)SA 8000 (Social Accountability Internationallabor standard).AA1000 (International accountability assurante reporting standard).Copenhagen Charter(International standard involving stakeholdercommunications).GRI (Global Reporting Initiative) 2000 (International sustainability report).Models for corporate social responsibility reportingApproaches to social and natural environmental accountability have been developed for various purposes. Classifying them under the umbrella of CSR reporting we will discuss some widely used models and introduce a less well-known model, which may provide additional benefit.Eco-Management and Audit Scheme ( EMAS, 1995,2001)The European Commission set down the basic principles underlying the EMAS scheme in Council Regulation 1836/93 -EMAS of the European Commission. The purpose was improvement of environmental performance and was initially directed at manufacturing firms. This has since been extended to allow broad participation by any public or private entity wishing to participate. The regulation calls for an environmental statement from the entity and requires auditing.Further,there is a continual requirement to document ongoing continual improvement through the of implementation policies, programmes and management systems by a systematic, objective, and periodic evaluation of performance. There is also an obligation to inform the public of the results of the evaluation.The article on participation states that the scheme is open topublic or privateentities operating in the EU or the European Economic Area (EEA).The site may be registered if the site has an environmental policy, asite review, an environmental audit,objectives for continuousimprovement, a statement from each site, verification covering poficy, programmes, the management system, the review and audit procedure, and the statement provided. The validated environmental statement is then forwarded to the competent body in the Member State. The statement is also disseminated to the public after the registration of the site has been completed. The statement should be a concise, comprehensible description of activities at the site; with an assessment of significant relevant environmental issues, including: emissions, waste generation, consumption of raw materials, energy and water, noise and other significant aspects; a presentation of the company's environmental poficy, programme and management system at the site, the deadline for the next statement, and the name of the accredited environmental verifier. The EMAS 2001 was strengthened by requiring ISO 14001 as the environmental management system.Council on Economic Priorities Accreditation Agency Social Accountability Standard (SA8000, 1998)/renamed Social Accountability International (SAI)This standard has a change in focus and is concerned with fair labor practices world wide. It is divided into purpose and scope, normative elements and their interpretation, definitions,and social accountability requirements.The social accountability requirements include: child labor,forced labor, health and safety, freedom of associanon and right to collective bargaining, discrimination, disciplinary practices, working hours,compensation, management systems, management review,company representatives,planning and implementation, control of suppliers, addressing concerns and taking corrective action, outside communication, access for verification and anizationschoosing to adopt this standard are encouraged to require theirsuppliers to comply with its requirements also. This extends it widelyinto global society. Organizations can adopt these standards voluntarily and may disclose their tompliance with the provisions of the standard as part of other statements issued.Institute of Social and Ethical Accountability Standard AA1000 (1999) The first standard for building corporate accountability and trustwas issued in November 1999 by the Institute of Social and Ethical Accountability (ISEA).The ISEA states that the AA 1000standard“provides both a framework that organizationscan use to understand and improve their ethical performance and a means to judge the validity of ethical claims made." The AA1000 standardis described as:an Accountability standard, focused on quality of social and ethical accounting,reporting. securing the auditing and reporting”AA1000 comprises principles (the characteristics of anquality process) and a set of process standards. Thebprocess standards cover planning, accounting,auditing and reporting, embedding, and stakeholder engagement (AA1000, 1999, p. 1).The focus is on improving overall performance through measurement, quality management, recruitment and retention of employees, external stakeholder engagement, partnership, risk management, investors,governance, government and regulatory relations and training (AA1000, 1999, pp. 3-4).Auditing and quality assurance are required as a part of the system. The users of AA1000 are expected to include adopting organizations, stakeholders, service providers, and standards developers. Thus we see the inclusion of societal stakeholders as constituents.Concluding remarksIn this paper, we have adopted the relational view of stakeholders suggested by the theory of pragmatism.Under this perspective, CSR reporting becomes part of an ongoing discourse between a corporation and its stakeholders, rather than one-way communication about past performance. We use Habermas' theory of communicative action to provide guidance on how this discourse can be conducted in a manner that leadsto morally justifiable outcomes. We examine how Habermasian principles are approximated in existing reporting models such as EMAS,ISO, SA 8000, AA 1000, and The Copenhagen Charter.The widespread voluntary adoption of various reporting models allows decision makers interested in social responsibility to evaluate corporations using this information in the context of a perceived social contract. The use of frameworks that approximate principles of communicative action allows investigation not only of reported outcomes, but also of the processes involved.Based on our examination of corporate social responsibilityreporting models currently in use, we conclude that progress is being made in CSR reporting, and communication. Models exist that enablecorporations to report on their social, environmental, and ethical performance. The existing models discussed in this paper offer opportunity for some transparency and greatly enhance the ability for broader stakeholders to compare companies and their performance in these critical arenas. However,the models do not quite move to the level of ethical discourse through which social progress might be achieved. We believe that a different philosophical perspective, making stakeholders an intrinsic part of the discourse rather than peripheral to the process,and engaging them in discourse that is open, fair, and democratic would move society toward moral corporate discourse.Several of the models examined offer aspects that lead in this direction. Modifications of frameworks and frameworks in progress, such as the SA1000 Stakeholder Engagement Standard, provide evidence that corporations and their constituents recognize that corporate accountability is supported by effective stakeholder engagement. As reporting on CSR performance encourages performance improvements,we believe that the same holds for moral discourse.Ascompanies move toward greater transparency in the processes and outcomes of stakeholder discourse, we expect movement toward ideal speech and moral communicative outcomes.。

液压系统外文文献翻译中英文

外文文献翻译(含：英文原文及中文译文)英文原文Hydraulic systemW Arnold1 IntroductionThe hydraulic station is called a hydraulic pump station and is an independent hydraulic device. It is step by step to supply oil. And control the direction of hydraulic oil flow, pressure and flow, suitable for the host and hydraulic equipment can be separated on the various hydraulic machinery.After the purchase, the user only needs to connect the hydraulic station and the actuator (hydraulic or oil motor) on the mainframe with different tubings. The hydraulic machine can realize various specified actions and working cycles.The hydraulic station is a combination of manifolds, pump units or valve assemblies, electrical boxes, and tank electrical boxes. Each part function is:The pump unit is equipped with a motor and an oil pump, which is the power source of the hydraulic station and can convert mechanical energy into hydraulic oil pressure energy.V alve combination - its plate valve is mounted on the vertical plate, and the rear plate is connected with the same function as the manifold.Oil manifolds - assembled from hydraulic valves and channel bodies. It regulates hydraulic oil pressure, direction and flow.Box--a semi-closed container for plate welding. It is also equipped with an oil screen, an air filter, etc., which is used for cooling and filtering of oil and oil.Electrical box - divided into two types: one is to set the external lead terminal board; one is equipped with a full set of control appliances.The working principle of the hydraulic station: The motor drives the oil pump to rotate, then the pump sucks oil from the oil tank and supplies oil, converts the mechanical energy into hydraulic pressure energy, and the hydraulic oil passes through the manifold (or valve assembly) to adjust the direction, pressure and flow and then passes through the external tube. The way to the hydraulic cylinder or oil motor in the hydraulic machinery, so as to control the direction of the hydraulic motor, the strength of the speed and speed, to promote all kinds of hydraulic machinery to do work.(1) Development history of hydraulic pressureThe development history of hydraulics (including hydraulic power, the same below), pneumatics, and seals industry in China can be roughly divided into three stages, namely: the starting stage in the early 1950s to the early 60s; and the professional in the 60s and 70s. The growth stage of the production system; the 80-90's is a stage of rapid development. Among them, the hydraulic industry began in the early 1950s with thedevelopment of hydraulic machines such as Grinding Machines, broaching machines, and profiling lathes, which were produced by the machine tool industry. The hydraulic components were produced by the hydraulic workshop in the machine tool factory, and were produced for self use. After entering the 1960s, the application of hydraulic technology was gradually promoted from the machine tool to the agricultural machinery and engineering machinery. The original hydraulic workshop attached to the main engine plant was independent and became a professional manufacturer of hydraulic components. In the late 1960s and early 1970s, with the continuous development of mechanization of production, particularly in the provision of highly efficient and automated equipment for the second automobile manufacturing plant, the hydraulic component manufacturing industry witnessed rapid development. The batch of small and medium-sized enterprises also began to become specialized manufacturers of hydraulic parts. In 1968, the annual output of hydraulic components in China was close to 200,000 pieces. In 1973, in the fields of machine tools, agricultural machinery, construction machinery and other industries, the professional factory for the production of hydraulic parts has grown to over 100, and its annual output exceeds 1 million pieces. Such an independent hydraulic component manufacturing industry has taken shape. At this time, the hydraulic product has evolved from the original imitation Su product intoa combination of imported technology and self-designed products. The pressure has been developed towards medium and high pressures, and electro-hydraulic servo valves and systems have been developed. The application of hydraulics has been further expanded. The pneumatic industry started a few years later than hydraulics, and it was only in 1967 that it began to establish a professional pneumatic components factory. Pneumatic components began to be manufactured and sold as commodities. Its sealing industry including rubber seals, flexible graphite seals, and mechanical seals started from the production of common O-rings, oil seals, and other extruded rubber seals and asbestos seal products in the early 1950s. In the early 1960s, it began to develop and produce flexible products. Graphite seals and mechanical seals and other products. In the 1970s, a batch of batches of professional production plants began to be established one after another in the systems of the former Ministry of Combustion, the Ministry of Agriculture, and the Ministry of Agricultural Machinery, formally forming the industry, which laid the foundation for the development of the seal industry.In the 1980s, under the guidance of the national policy of reform and opening up, with the continuous development of the machinery industry, the contradiction between the basic components lags behind the host computer has become increasingly prominent and caused the attention of all relevant departments. To this end, the former Ministry of Machinesestablished the General Infrastructure Industry Bureau in 1982, and unified the original pneumatic, hydraulic, and seal specialties that were scattered in the industries of machine tools, agricultural machinery, and construction machinery, etc. The management of a piece of office, so that the industry in the planning, investment, the introduction of technology and scientific research and development and other aspects of the basic parts of the bureau's guidance and support. This has entered a period of rapid development, it has introduced more than 60 foreign advanced technology, of which more than 40 hydraulic, pneumatic 7, after digestion and absorption and technological transformation, are now mass production, and has become the industry's leading products . In recent years, the industry has intensified its technological transformation. From 1991 to 1998, the total investment of national, local, and corporate self-raised funds totaled about 2 billion yuan, of which more than 1.6 billion were hydraulic. After continuous technological transformation and technological breakthroughs, the technical level of a group of major enterprises has been further improved, and technological equipment has also been greatly improved, laying a good foundation for forming a high starting point, specialization, and mass production. In recent years, under the guidance of the principle of common development of multiple ownership systems in the country, various small and medium-sized enterprises with different ownership have rapidly emerged and haveshown great vitality. With the further opening up of the country, foreign-funded enterprises have developed rapidly, which plays an important role in raising industry standards and expanding exports. So far China has established joint ventures with famous manufacturers in the United States, Germany, Japan and other countries or directly established piston pumps/motors, planetary speed reducers, hydraulic control valves, steering gears, hydraulic systems, hydrostatic transmissions, and hydraulic components. The company has more than 50 manufacturing enterprises such as castings, pneumatic control valves, cylinders, gas processing triplets, rubber seals, and mechanical seals, and has attracted more than 200 million U.S. dollars in foreign capital.(2) Current statusBasic profileAfter more than 40 years of hard work, China's hydraulics, pneumatics and seals industry has formed a complete industrial system with a certain level of production capacity and technical level. According to the statistics of the third n ational industrial census in 1995, China’s state-owned, privately-owned, cooperative, village-run, individual, and “funded enterprises” have annual sales income of more than 1 million yuan in hydraulic, pneumatic, and seal industrial townships and above. There are a total of more than 1,300 companies, including about 700 hydraulics, and about 300 pneumatic and sealing parts. According to thestatistics of the international industry in 1996, the total output value of the hydraulic industry in China was about 2.448 billion yuan, accounting for the 6th in the world; the total output value of the pneumatic industry was about 419 million yuan, accounting for the world’s10 people.2. Current supply and demand profileWith the introduction of technology, independent development and technological transformation, the technical level of the first batch of high-pressure plunger pumps, vane pumps, gear pumps, general hydraulic valves, oil cylinders, oil-free pneumatic components and various types of seals has become remarkable. Improve, and can be stable mass production, provide guarantees for all types of host to improve product quality. In addition, certain achievements have also been made in the aspects of CAD, pollution control, and proportional servo technology for hydraulic pneumatic components and systems, and have been used for production. So far, the hydraulic, pneumatic and seal products have a total of about 3,000 varieties and more than 23,000 specifications. Among them, there are about 1,200 types of hydraulic pressure, more than 10,000 specifications (including 60 types of hydrodynamic products, 500 specifications); about 1350 types of pneumatic, more than 8,000 specifications; there are also 350 types of rubber seals, more than 5000 The specifications are now basically able to adapt to the general needs ofvarious types of mainframe products. The matching rate for major equipment sets can reach more than 60%, and a small amount of exports has started.In 1998, the domestic production of hydraulic components was 4.8 million pieces, with sales of about 2.8 billion yuan (of which mechanical systems accounted for 70%); output of pneumatic components was 3.6 million pieces, and sales were about 550 million yuan (including mechanical systems accounting for about 60%) The production of seals is about 800 million pieces, and the sales volume is about 1 billion yuan (including about 50% of mechanical systems). According to the statistics of the annual report of the China Hydraulic and Pneumatic Sealing Industry Association in 1998, the production and sales rate of hydraulic products was 97.5% (101% of hydraulic power), 95.9% of air pressure, and 98.7% of seal. This fully reflects the basic convergence of production and sales.Although China's hydraulic, pneumatic and sealing industries have made great progress, there are still many gaps compared with the development needs of the mainframe and the world's advanced level, which are mainly reflected in the variety, performance and reliability of products. . Take hydraulic products as an example, the product varieties are only 1/3 of the foreign country, and the life expectancy is 1/2 of that of foreign countries. In order to meet the needs of key hosts, imported hosts, and majortechnical equipment, China has a large number of imported hydraulic, pneumatic, and sealing products every year. According to customs statistics and relevant data analysis, in 1998, the import volume of hydraulic, pneumatic and seal products was about 200 million U.S. dollars, of which the hydraulic pressure was about 140 million U.S. dollars, the pneumatics were 30 million U.S. dollars, and the seal was about 0.3 billion U.S. dollars. The year is slightly lower. In terms of amount, the current domestic market share of imported products is about 30%. In 1998, the total demand for hydraulic parts in the domestic market was about 6 million pieces, and the total sales volume was 4 billion yuan; the total demand for pneumatic parts was about 5 million pieces, and the total sales volume was over 700 million yuan; the total demand for seals was about 1.1 billion yuan. Pieces, total sales of about 1.3 billion yuan. (3) Future developments1. The main factors affecting development(1) The company's product development capability is not strong, and the level and speed of technology development can not fully meet the current needs for advanced mainframe products, major technical equipment and imported equipment and maintenance;(2) Many companies have lagged behind in manufacturing process, equipment level and management level, and their sense of quality is not strong, resulting in low level of product performance, unstable quality,poor reliability, and insufficiency of service, and lack of user satisfaction. And trusted branded products;(3) The degree of professional specialization in the industry is low, the power is scattered, the duplication of the low level is serious, the product convergence between the region and the enterprise leads to blind competition, and the prices are reduced each other, thus the efficiency of the enterprise is reduced, the funds are lacking, and the turnover is difficult. Insufficient investment in development and technological transformation has severely restricted the overall level of the industry and its competitive strength.(4) When the degree of internationalization of the domestic market is increasing, foreign companies have gradually entered the Chinese market to participate in competition, coupled with the rise of domestic private, cooperative, foreign-funded, and individual enterprises, resulting in increasing impact on state-owned enterprises. .2. Development trendWith the continuous deepening of the socialist market economy, the relationship between supply and demand in the hydraulic, pneumatic and sealed products has undergone major changes. The seller market characterized by “shortage” has basically become a buyer’s market characterized by “structured surplus”. Replaced by. From the perspective of overall capacity, it is already in a trend of oversupply, and in particular,general low-grade hydraulic, pneumatic and seals are generally oversupply; and like high-tech products with high technological content and high value and high value-added products that are urgently needed by the host, Can not meet the needs of the market, can only rely on imports. After China's entry into the WTO, its impact may be greater. Therefore, during the “10th Five-Y ear Plan” period, the growth of the industry’s output value must not only rely on the growth of quantity. Instead, it should focus on the structural contradiction of the industry and intensify efforts to adjust the industrial structure and product structure. It should be based on the improvement of quality. Product technology upgrades in order to adapt to and stimulate market demand, and seek greater development.2. Hydraulic application on power slide(1) Introduction of Power Sliding TableUsing the binding force curve diagram and the state space analysis method to analyze and study the sliding effect and the smoothness of the sliding table of the combined machine tool, the dynamics of the hydraulic drive system of the sliding table—the self-regulating back pressure regulating system are established. mathematical model. Through the digital simulation system of the computer, the causes and main influencing factors of the slide impact and the motion instability are analyzed. What kind of conclusions can be drawn from those, if we canreasonably design the structural dimensions of hydraulic cylinders and self-regulating back pressure regulators ——The symbols used in the text are as follows:s 1 - flow source, that is, the flow rate of the governor valve outlet;S el —— sliding friction of the sliding table;R - the equivalent viscous friction coefficient of the slide;I 1 - quality of slides and cylinders;12 - self-adjusting back pressure valve core quality;C 1, c 2 - liquid volume without cylinder chamber and rod chamber;C 2 - Self-adjusting back pressure valve spring compliance;R 1, R2 - Self-adjusting back pressure valve damping orifice fluid resistance;R 9 - Self-adjusting back pressure valve valve fluid resistance;S e2——initial pre-tightening force of self-adjusting back pressure valve spring;I 4, I5 - Equivalent liquid sense of the pipeline;C 5, C 6 - equivalent liquid capacity of the pipeline;R 5, R7 - Equivalent liquid resistance of the pipeline;V 3, V4 - cylinder rodless cavity and rod cavity volume;P 3, P4—pressure of the rodless cavity and rod cavity of the cylinder;F - the slide bears the load;V - speed of slide motion;In this paper, the power bond diagram and the state space splitting method are used to establish the system's motion mathematical model, and the dynamic characteristics of the slide table can be significantly improved.In the normal operation of the combined machine tool, the magnitude of the speed of the slide, its direction and the load changes it undergoes will affect its performance in varying degrees. Especially in the process of work-in-process, the unsteady movement caused by the advancing of the load on the slide table and the cyclical change of the load will affect the surface quality of the workpiece to be machined. In severe cases, the tool will break. According to the requirements of the Dalian Machine Tool Plant, the author used the binding force curve diagram and the state space analysis method to establish a dynamic mathematical model of a self-adjusting back pressure and speed adjustment system for the new hydraulic drive system of the combined machine tool slide. In order to improve the dynamic characteristics of the sliding table, it is necessary to analyze the causes and main influencing factors of the impetus and movement of the sliding table. However, it must pass the computer's digital simulation and the final results obtained from the research.(2) Dynamic Mathematical ModelThe working principle diagram of the self-adjusting back pressure speedregulation system of the combined machine tool slide hydraulic drive system is shown in the figure. This system is used to complete the work-cycle-stop-rewind. When the sliding table is working, the three-position four-way reversing valve is in the illustrated position. The oil supply pressure of the oil pump will remain approximately constant under the effective action of the overflow valve, and the oil flow passes through the reversing valve and adjusts the speed. The valve enters the rodless chamber of the cylinder to push the slide forward. At the same time, the pressurized oil discharged from the rod chamber of the cylinder will flow back to the tank through the self-regulating back pressure valve and the reversing valve. During this process, there was no change in the operating status of both the one-way valve and the relief valve. The complex and nonlinear system of the hydraulic drive system of the self-adjusting back pressure governor system is a kind of self-adjusting back-pressure governor system. To facilitate the study of its dynamic characteristics, a simple and reasonable dynamic mathematical model that only considers the main influencing factors is established. Especially important [1][2]. From the theoretical analysis and the experimental study, we can see that the system process time is much longer than the process time of the speed control valve. When the effective pressure bearing area of the rodless cavity of the fuel tank is large, the flow rate at the outlet of the speed control valve is instantaneous. The overshoot is reflected in thesmall change in speed of the slide motion [2]. In order to further broaden and deeply study the dynamic characteristics of the system so that the research work can be effectively performed on a miniature computer, this article will further simplify the original model [2], assuming that the speed control valve is output during the entire system pass. When the flow is constant, this is considered to be the source of the flow. The schematic diagram of the dynamic model structure of this system is shown in Fig. 2. It consists of a cylinder, a sliding table, a self-adjusting back pressure valve, and a connecting pipe.The power bond graph is a power flow graph. It is based on the transmission mode of the system energy, based on the actual structure, and uses the centralized parameters to represent the role of the subsystems abstractly as a resistive element R, a perceptual element I, and a capacitive element. Three kinds of role of C. Using this method, the physical concept of modeling is clear, and combined with the state-space analysis method, the linear system can be described and analyzed more accurately. This method is an effective method to study the dynamic characteristics of complex nonlinear systems in the time domain. According to the main characteristics of each component of the self-adjusting back pressure control system and the modeling rules [1], the power bond diagram of the system is obtained. The upper half of each key in the figure represents the power flow. The two variables that makeup the power are the force variables (oil pressure P and force F) and the flow variables (flow q and velocity v). The O node indicates that the system is connected in parallel, and the force variables on each key are equal and the sum of the flow variables is zero; 1 The nodes represent the series connection in the system, the flow variables on each key are equal and the sum of the force variables is Zero. TF denotes a transformer between different energy forms. The TF subscripted letter represents the conversion ratio of the flow variable or the force variable. The short bar on the key indicates the causal relationship between the two variables on the key. The full arrow indicates the control relationship. There are integral or differential relationships between the force and flow variables of the capacitive and perceptual elements in the three types of action elements. Therefore, a complex nonlinear equation of state with nine state variables can be derived from Fig. 3 . In this paper, the research on the dynamic characteristics of the sliding table starts from the two aspects of the slide's hedging and the smoothness of the motion. The fourth-order fixed-length Runge-Kutta is used for digital simulation on the IBM-PC microcomputer.(3) Slide advanceThe swaying phenomenon of the slide table is caused by the sudden disappearance of the load acting on the slide table (such as drilling work conditions). In this process, the table load F, the moving speed V, and thepressure in the two chambers of the cylinder P3 and P4 can be seen from the simulation results in Fig. 4. When the sliding table moves at a uniform speed under the load, the oil pressure in the rodless cavity of the oil cylinder is high, and a large amount of energy is accumulated in the oil. When the load suddenly disappears, the oil pressure of the cavity is rapidly reduced, and the oil is rapidly reduced. When the high-pressure state is transferred to the low-pressure state, a lot of energy is released to the system, resulting in a high-speed forward impact of the slide. However, the front slide of the sliding table causes the pressure in the rod cavity of the oil cylinder to cause the back pressure to rise, thereby consuming part of the energy in the system, which has a certain effect on the kicking of the slide table. We should see that in the studied system, the inlet pressure of the self-adjusting back pressure valve is subject to the comprehensive effect of the two-chamber oil pressure of the oil cylinder. When the load suddenly disappears, the pressure of the self-adjusting back pressure valve rapidly rises and stably exceeds the initial back pressure value. It can be seen from the figure that self-adjusting back pressure in the speed control system when the load disappears, the back pressure of the cylinder rises more than the traditional speed control system, so the oil in the rod cavity of the cylinder absorbs more energy, resulting in the amount of forward momentum of the slide It will be about 20% smaller than traditionalspeed control systems. It can be seen from this that the use of self-adjusting back-gear speed control system as a drive system slider has good characteristics in suppressing the forward punch, in which the self-adjusting back pressure valve plays a very large role.(4) The smoothness of the slideWhen the load acting on the slide changes periodically (such as in the case of milling), the speed of the slide will have to fluctuate. In order to ensure the processing quality requirements, it must reduce its speed fluctuation range as much as possible. From the perspective of the convenience of the discussion of the problem, assume that the load changes according to a sine wave law, and the resulting digital simulation results are shown in Figure 5. From this we can see that this system has the same variation rules and very close numerical values as the conventional speed control system. The reason is that when the change of the load is not large, the pressure in the two chambers of the fuel tank will not have a large change, which will eventually lead to the self-regulating back pressure valve not showing its effect clearly.(5) Improvement measuresThe results of the research show that the dynamic performance of a sliding table with self-regulating back pressure control system as a drive system is better than that of a traditional speed control system. To reduce the amount of kick in the slide, it is necessary to rapidly increase the backpressure of the rod cavity when the load disappears. To increase the smoothness of the sliding table, it is necessary to increase the rigidity of the system. The main measure is to reduce the volume of oil. From the system structure, it is known that the cylinder has a large volume between the rod cavity and the oil discharge pipe, as shown in Fig. 6a. Its existence in terms of delay and attenuation of the self-regulating back pressure valve function, on the other hand, also reduces the rigidity of the system, it will limit the further improvement of the propulsion characteristics and the smoothness of the motion. Thus, improving the dynamic characteristics of the sliding table can be handled by two methods: changing the cylinder volume or changing the size of the self-regulating back pressure valve. Through the simulation calculation of the structural parameters of the system and the comparison of the results, it can be concluded that the ratio of the volume V4 between the rod cavity and the oil discharge pipe to the volume V3 between the rodless cavity and the oil inlet pipe is changed from 5.5 to 5.5. At 1 oclock, as shown in the figure, the diameter of the bottom end of the self-adjusting back pressure valve is increased from the original 10mm to 13mm, and the length of the damper triangle groove is reduced from the original lmm to 0.7mm, which will enable the front of the slide table. The impulse is reduced by 30%, the transition time is obviously shortened, and the smoothness of the slide motion will also be greatly improved.中文译文液压系统W Arnold1. 绪论液压站称液压泵站,是独立的液压装置。

70词英语作文带译文

70词英语作文带译文
Certainly, here's a 70-word English essay with its translation:
Title: "The Importance of Education"
Education is the key to unlocking opportunities. It empowers individuals to reach their full potential and contributes to societal progress. Through learning, we acquire knowledge, critical thinking skills, and the
ability to adapt to a changing world. Education fosters innovation, drives economic growth, and promotes social cohesion. In essence, investing in education is investing
in a brighter future for individuals and society as a whole.
Translation: 教育的重要性。

教育是打开机会之门的关键。

它赋予个人实现其全部潜能的能力，并促进社会进步。

通过学习，我们获得知识、批判性思维技能
和适应变化世界的能力。

教育促进创新，推动经济增长，并促进社
会凝聚力。

从本质上讲，投资于教育就是为个人和整个社会投资于更加光明的未来。

英文小作文加翻译

英文小作文加翻译英文：Recently, I have been feeling a bit down and struggling to find motivation to do things. I think it might be due to the current situation with the pandemic and being stuck at home most of the time. I have been trying to find ways to lift my mood and get back on track, and I have found a few things that have helped.Firstly, I have started to exercise more regularly. I have been doing some yoga and going for walks in my local park. I find that getting outside and moving my body helps to clear my head and boost my energy levels.Secondly, I have been trying to stay connected with friends and family. Even though we can't meet in person, I have been making an effort to have regular video calls and catch-ups. It's important to have social support,especially during difficult times.Lastly, I have been trying to focus on things that I enjoy and that make me happy. For example, I have been reading more books and watching my favourite TV shows. It's important to take time for yourself and do things that bring you joy.Overall, I think it's important to be kind to ourselves during this challenging time and to find ways to take care of our mental health.中文：最近，我感到有点沮丧，缺乏做事的动力。

儿童教育外文翻译文献

儿童教育外文翻译文献(文档含中英文对照即英文原文和中文翻译)原文：The Role of Parents and Community in the Educationof the Japanese ChildHeidi KnipprathAbstractIn Japan, there has been an increased concern about family and community participation in the child’s educat ion. Traditionally, the role of parents and community in Japan has been one of support and less one of active involvement in school learning. Since the government commenced education reforms in the last quarter of the 20th century, a more active role for parents and the community in education has been encouraged. These reforms have been inspired by the need to tackle various problems that had arisen, such as the perceived harmful elements of society’spreoccupation with academic achievement and the problematic behavior of young people. In this paper, the following issues are examined: (1) education policy and reform measures with regard to parent and community involvement in the child’s education; (2) the state of parent and community involvement at the eve of the 20th century.Key Words: active involvement, community, education reform, Japan, parents, partnership, schooling, supportIntroduction: The Discourse on the Achievement GapWhen western observers are tempted to explain why Japanese students attain high achievement scores in international comparative assessment studies, they are likely to address the role of parents and in particular of the mother in the education of the child. Education mom is a phrase often brought forth in the discourse on Japanese education to depict the Japanese mother as being a pushy, and demanding home-bound tutor, intensely involved in the child’s education due to severe academic competition. Although this image of the Japanese mother is a stereotype spread by the popular mass media in Japan and abroad, and the extent by which Japanese mothers are absorbed in their children is exaggerated (Benjamin, 1997, p. 16; Cummings, 1989, p. 297; Stevenson & Stigler, 1992, p. 82), Stevenson and Stigler (1992) argue that Japanese parents do play an indispensable role in the academic performance of their children. During their longitudinal and cross-national research project, they and their collaborators observed that Japanese first and fifth graders persistently achieved higher on math tests than American children. Besides reciting teacher’s teaching style, cultural beliefs, and organization of schooling, Stevenson and Stigler (1992) mention parent’s role in supporting the learning conditions of the child to explain differences in achievement between elementary school students of the United States and students of Japan. In Japan, children receive more help at home with schoolwork (Chen & Stevenson, 1989; Stevenson & Stigler, 1992), and tend to perform less household chores than children in the USA (Stevenson et al., 1990; Stevenson & Stigler, 1992). More Japanese parents than American parents provide space and a personal desk and purchase workbooks for their children to supplement their regular text-books at school (Stevenson et al., 1990; Stevenson & Stigler, 1992). Additionally, Stevenson and Stigler (1992) observed that American mothers are much more readily satisfied with their child’s performance than Asian parents are, have less realistic assessments of their child’s academic perform ance, intelligence, and other personality characteristics, and subsequently have lower standards. Based on their observation of Japanese, Chinese and American parents, children and teachers, Stevenson and Stigler (1992) conclude that American families can increase the academic achievement of their children by strengthening the link between school and home, creating a physical and psychological environment that is conducive to study, and by making realistic assessments and raising standards. Also Benjamin (1997), who performed ‘day-to-day ethnography’ to find out how differences in practice between American and Japanese schools affect differences in outcomes, discusses the relationship between home and school and how the Japanese mother is involved in the academic performance standards reached by Japanese children. She argues that Japanese parents are willing to pay noticeable amounts of money for tutoring in commercial establishments to improve the child’s performance on entrance examinations, to assist in ho mework assignments, to facilitate and support their children’s participation in school requirements and activities, and to check notebooks of teachers on the child’s progress and other school-related messages from the teacher. These booklets are read and written daily by teachers and parents. Teachers regularly provide advice and reminders to parents, and write about homework assignments of the child, special activities and the child’s behavior (Benjamin, 1997, p. 119, p. 1993–1995). Newsletters, parents’ v isits to school, school reports, home visits by the teacher and observation days sustain communication in later years at school. According toBenjamin (1997), schools also inform parents about how to coach their children on proper behavior at home. Shimahara (1986), Hess and Azuma (1991), Lynn (1988) and White (1987) also try to explain national differences in educational achievement. They argue that Japanese mothers succeed in internalizing into their children academic expectations and adaptive dispositions that facilitate an effective teaching strategy, and in socializing the child into a successful person devoted to hard work.Support, Support and SupportEpstein (1995) constructed a framework of six types of involvement of parents and the community in the school: (1) parenting: schools help all families establish home environments to support children as students; (2) communicating: effective forms of school-to-home and home-to-school communications about school programs and children’s progress; (3) volu nteering: schools recruit and organize parents help and support; (4) learning at home: schools provide information and ideas to families about how to help students at home with homework and other curriculum-related activities, decisions and planning; (5) decision making: schools include parents in school decisions, develop parent leaders and representatives; and (6) collaborating with the community: schools integrate resources and services from the community to strengthen school programs, family practices, and student learning and development. All types of involvement mentioned in studies of Japanese education and in the discourse on the roots of the achievement gap belong to one of Epstein’s first four types of involvement: the creation of a conducive learn ing environment (type 4), the expression of high expectations (type 4), assistance in homework (type 4), teachers’ notebooks (type 2), mother’s willingness to facilitate school activities (type3) teachers’ advice about the child’s behavior (type 1), observ ation days by which parents observe their child in the classroom (type 2), and home visits by the teachers (type 1). Thus, when one carefully reads Stevenson and Stigler’s, Benjamin’s and other’s writings about Japanese education and Japanese students’ high achievement level, one notices that parents’ role in the child’s school learning is in particular one of support, expected and solicited by the school. The fifth type (decision making) as well as the sixth type (community involvement) is hardly ever mentioned in the discourse on the achievement gap.In 1997, the OECD’s Center for Educational Research and Innovation conducted a cross-national study to report the actual state of parents as partners in schooling in nine countries, including Japan. In its report, OECD concludes that the involvement of Japanese parents in their schools is strictly limited, and that the basis on which it takes place tends to be controlled by the teacher (OECD, 1997, p. 167). According to OECD (1997), many countries are currently adopting policies to involve families closely in the education of their children because (1) governments are decentralizing their administrations; (2) parents want to be increasingly involved; and (3) because parental involvement is said to be associated with higher achievement in school (p. 9). However, parents in Japan, where students already score highly on international achievement tests, are hardly involved in governance at the national and local level, and communication between school and family tends to be one-way (Benjamin, 1997; Fujita, 1989; OECD, 1997). Also parent–teacher associations (PTA, fubo to kyoshi no kai ) are primarily presumed to be supportive of school learning and not to participate in school governance (cf. OECD, 2001, p. 121). On the directionsof the occupying forces after the second world war, PTA were established in Japanese schools and were considered with the elective education boards to provide parents and the community an opportunity to participate actively in school learning (Hiroki, 1996, p. 88; Nakata, 1996, p. 139). The establishment of PTA and elective education boards are only two examples of numerous reform measures the occupying forces took to decentralize the formal education system and to expand educational opportunities. But after they left the country, the Japanese government was quick to undo liberal education reform measures and reduced the community and parental role in education. The stipulation that PTA should not interfere with personnel and other administrative tasks of schools, and the replacement of elective education boards by appointed ones, let local education boards believe that parents should not get involved with school education at all (Hiroki, 1996, p. 88). Teachers were regarded to be the experts and the parents to be the laymen in education (Hiroki, 1996, p. 89).In sum, studies of Japanese education point into one direction: parental involvement means being supportive, and community involvement is hardly an issue at all. But what is the actual state of parent and community involvement in Japanese schools? Are these descriptions supported by quantitative data?Statistics on Parental and Community InvolvementTo date, statistics of parental and community involvement are rare. How-ever, the school questionnaire of the TIMSS-R study did include some interesting questions that give us a clue about the degree of involvement relatively compared to the degree of involvement in other industrialized countries. The TIMSS-R study measured science and math achievement of eighth graders in 38 countries. Additionally, a survey was held among principals, teachers and students. Principals answered questions relating to school management, school characteristics, and involvement. For convenience, the results of Japan are only compared with the results of those countries with a GNP of 20650 US dollars or higher according to World Bank’s indicators in 1999.Unfortunately, only a very few items on community involvement were measured. According to the data, Japanese principals spend on average almost eight hours per month on representing the school in the community (Table I). Australian and Belgian principals spend slightly more hours and Dutch and Singaporean principals spend slightly less on representing the school and sustaining communication with the community. But when it comes to participation from the community, Japanese schools report a nearly absence of involvement (Table II). Religious groups and the business community have hardly any influence on the curriculum of the school. In contrast, half of the principals report that parents do have an impact in Japan. On one hand, this seems a surprising result when one is reminded of the centralized control of the Ministry of Education. Moreover, this control and the resulting uniform curriculum are often cited as a potential explanation of the high achievement levels in Japan. On the other hand, this extent of parental impact on the curriculum might be an indicator of the pressure parents put on schools to prepare their children appropriately for the entrance exams of senior high schools.In Table III, data on the extent of other types of parental involvement in Japan and other countries are given. In Japan, parental involvement is most common in case of schools volunteering for school projects and programs, and schools expecting parents to make sure that thechild completes his or her homework. The former is together with patrolling the grounds of the school to monitor student behavior most likely materialized through the PTA. The kinds and degree of activities of PTA vary according to the school, but the activities of the most active and well-organized PTA’s of 395 elementary schools investigated by Sumida (2001)range from facilitating sport and recreation for children, teaching greetings, encouraging safe traffic, patrolling the neighborhood, publishing the PTA newspaper to cleaning the school grounds (pp. 289–350). Surprisingly, less Japanese principals expect from the parents to check one’s child’s completion of homework than principals of other countries. In the discourse on the achievement gap, western observers report that parents and families in Japan provide more assistance with their children’s homework than parents and families outside Japan. This apparent contradiction might be the result of the fact that these data are measured at the lower secondary level while investigations of the roots of Japanese students’ high achievement levels focus on childhood education and learning at primary schools. In fact, junior high school students are given less homework in Japan than their peers in other countries and less homework than elementary school students in Japan. Instead, Japanese junior high school students spend more time at cram schools. Finally, Japanese principals also report very low degrees of expectations toward parents with regard to serving as a teacher aid in the classroom, raising funds for the school, assisting teachers on trips, and serving on committees which select school personnel and review school finances. The latter two items measure participation in school governance.In other words, the data support by and large the descriptions of parental of community involvement in Japanese schooling. Parents are requested to be supportive, but not to mount the territory of the teacher nor to be actively involved in governance. Moreover, whilst Japanese principals spend a few hours per month on communication toward the community, involvement from the community with regard to the curriculum is nearly absent, reflecting the nearly absence of accounts of community involvement in studies on Japanese education. However, the reader needs to be reminded that these data are measured at the lower secondary educational level when participation by parents in schooling decreases (Epstein, 1995; OECD, 1997; Osakafu Kyoiku Iinkai, unpublished report). Additionally, the question remains what stakeholders think of the current state of involvement in schooling. Some interesting local data provided by the Osaka Prefecture Education Board shed a light on their opinion.ReferencesBenjamin, G. R. (1997). Japanese lessons. New York: New York University Press.Cave, P. (2003). Educational reform in Japan in the 1990s: ‘Individuality’ and other uncertainties. Comparative Education Review, 37(2), 173–191.Chen, C., & Stevenson, H. W. (1989). Homework: A cross-cultural examination. Child Development, 60(3), 551–561.Chuo Kyoiku Shingikai (1996). 21 seiki o tenbo shita wagakuni no kyoiku no arikata ni tsu-ite [First Report on the Model for Japanese Education in the Perspective of theCummings, W. K. (1989). The American perception of Japanese parative Education, 25(3), 293–302.Epstein, J. L. (1995). School/family/community partnerships. Phi Delta Kappan , 701–712.Fujita, M. (1989). It’s all mother’s fault: childcare and the socialization of working mothers in Japan. The Journal of Japanese Studies , 15(1), 67–91.Harnish, D. L. (1994). Supplemental education in Japan: juku schooling and its implication. Journal of Curriculum Studies , 26(3), 323–334.Hess, R. D., & Azuma, H. (1991). Cultural support for schooling, contrasts between Japanand the United States. Educational Researcher , 20(9), 2–8, 12.Hiroki, K. (1996). Kyoiku ni okeru kodomo, oya, kyoshi, kocho no kenri, gimukankei[Rights and duties of principals, teachers, parents and children in education. InT. Horio & T. Urano (Eds.), Soshiki toshite no gakko [School as an organization](pp. 79–100). Tokyo: Kashiwa Shobo. Ikeda, H. (2000). Chiiki no kyoiku kaikaku [Local education reform]. Osaka: Kaiho Shup-pansha.Kudomi, Y., Hosogane, T., & Inui, A. (1999). The participation of students, parents and the community in promoting school autonomy: case studies in Japan. International Studies in Sociology of Education, 9(3), 275–291.Lynn, R. (1988).Educational achievement in Japan. London: MacMillan Press.Martin, M. O., Mullis, I. V. S., Gonzalez, E. J., Gregory, K. D., Smith, T. A., Chrostowski,S. J., Garden, R. A., & O’Connor, K. M. (2000). TIMSS 1999 Intern ational science report, findings from IEA’s Repeat of the Third International Mathematics and ScienceStudy at the Eight Grade.Chestnut Hill: The International Study Center.Mullis, I. V. S., Martin, M. O., Gonzalez, E. J., Gregory, K. D., Garden, R. A., O’Connor, K. M.,Chrostowski, S. J., & Smith, T. A.. (2000). TIMSS 1999 International mathemat-ics report, findings from IEA’s Repeat of the Third International Mathematics and Science Study at the Eight Grade.Chestnut Hill: The International Study Center. Ministry of Education, Science, Sports and Culture (2000).Japanese government policies in education, science, sports and culture. 1999, educational reform in progress. Tokyo: PrintingBureau, Ministry of Finance.Monbusho Ed. (1999).Heisei 11 nendo, wagakuni no bunkyoshisaku : Susumu kaikaku [Japanese government policies in education, science, sports and culture 1999: Educational reform in progress]. Tokyo: Monbusho.Educational Research for Policy and Practice (2004) 3: 95–107 © Springer 2005DOI 10.1007/s10671-004-5557-6Heidi KnipprathDepartment of MethodologySchool of Business, Public Administration and TechnologyUniversity of Twente P.O. Box 2177500 AE Enschede, The Netherlands译文：家长和社区在日本儿童教育中的作用摘要在日本，人们越来越关心家庭和社区参与到儿童教育中。

英语翻译专业必翻经典文章英文原文+参考译文

文档简介文档简介一，一，英语翻译经典文章之英语翻译经典文章之英文原稿英文原稿二，二，中文翻译中文翻译：这篇英语文章的最好翻译版本！不是俺说的，是俺老师说哒！！英文原稿BrianIt seems my only request (It seems my only request (““please, let me sleep please, let me sleep””) is not clear enough, so I made this simple table that can help you when you that can help you when you’’re in doubt. Especially during the night Situa on what to do I’I’m sleeping m sleeping Do not enter my roomYou You’’re not sure if re not sure if I’I’I’m sleeping m sleeping and you want to checkNot your business Don Don’’t enter my room You You’’re under the re under the eﬀect eﬀect of drug of drugs s and you feel like entering my roomDon Don’’t enter my fucking room You saw a super cute video on you tu be and you want me to see it Don Don’’t enter my room Send me the link on FB World war 3 just started Don Don’’t care Don Don’’t enter my fucking room You or one of your friends want to want to ““have fun have fun”” with me I’I’m straight. m straight. m straight. I’I’I’m sorry m sorryDon't even touch my room door You want to clean my room Thanks but Thanks but I’I’I’ll take care of it myself ll take care of it myself Pu n just legalized gay marri agesThat That’’s wonderful! Finally !But don But don’’t enter my roomI’I’m not home m not homeDon Don’’t even think of entering my roomI’I’m m home, it it’’s day me, you knocked and I answered answered ““yes, come in yes, come in”” You can enter my room中文翻译中文翻译小子：小子：我只想好好地睡觉，你不明白吗？！所以，我做了这个简表。

英文文献小短文(原文加汉语翻译)

A fern that hyperaccumulates arsenic(这是题目，百度一下就能找到原文好，原文还有表格，我没有翻译)A hardy, versatile, fast-growing plant helps to remove arsenic from contaminated soilsContamination of soils with arsenic,which is both toxic and carcinogenic, is widespread1. We have discovered that the fern Pteris vittata (brake fern) is extremely efficient in extracting arsenic from soils and translocating it into its above-ground biomass. This plant —which, to our knowledge, is the first known arsenic hyperaccumulator as well as the first fern found to function as a hyperaccumulator— has many attributes that recommend it for use in the remediation of arsenic-contaminated soils.We found brake fern growing on a site in Central Florida contaminated with chromated copper arsenate (Fig. 1a). We analysed the fronds of plants growing at the site for total arsenic by graphite furnace atomic absorption spectroscopy. Of 14 plant species studied, only brake fern contained large amounts of arsenic (As;3,280–4,980 We collected additional samples of the plant and soil from the contaminated site –1,603 As) and from an uncontaminated site –As). Brake fern extracted arsenic efficiently from these soils into its fronds: plantsgrowing in the contaminated site contained 1,442–7,526 Arsenic and those from the uncontaminated site contained –These values are much higher than those typical for plants growing in normal soil, which contain less than of arsenic3.As well as being tolerant of soils containing as much as 1,500 arsenic, brake fern can take up large amounts of arsenic into its fronds in a short time (Table 1). Arsenic concentration in fern fronds growing in soil spiked with 1,500 Arsenic increased from to 15,861 in two weeks. Furthermore, in the same period, ferns growing in soil containing just 6 arsenic accumulated 755 Of arsenic in their fronds, a 126-fold enrichment. Arsenic concentrations in brake fernroots were less than 303 whereas those in the fronds reached 7,234 of 100 Arsenic significantly stimulated fern growth, resulting in a 40% increase in biomass compared with the control (data not shown).After 20 weeks of growth, the plant was extracted using a solution of 1:1 methanol:water to speciate arsenic with high-performance liquid chromatography–inductively coupled plasma mass spectrometry. Almost all arsenic was present as relatively toxic inorganic forms, with little detectable organoarsenic species4. The concentration of As(III) was greater in the fronds (47–80%) than in the roots %), indicating that As(V)was converted to As(III) during translocation from roots to fronds.As well as removing arsenic from soils containing different concentrations of arsenic (Table 1), brake fern also removed arsenic from soils containing different arsenic species (Fig. 1c). Again, up to 93% of the arsenic was concentrated in the fronds. Although both FeAsO4 and AlAsO4 are relatively insoluble in soils1, brake fern hyperaccumulated arsenic derived from these compounds into its fronds (136–315 levels 3–6 times greater than soil arsenic.Brake fern is mesophytic and is widely cultivated and naturalized in many areas with a mild climate. In the United States, it grows in the southeast and in southern California5. The fern is versatile and hardy, and prefers sunny (unusual for a fern) and alkaline environments (where arsenic is more available). It has considerable biomass, and is fast growing, easy to propagate,and perennial.We believe this is the first report of significant arsenic hyperaccumulation by an unmanipulated plant. Brake fern has great potential to remediate arsenic-contaminated soils cheaply and could also aid studies of arsenic uptake, translocation, speciation, distribution anddetoxification in plants.*Soil and Water Science Department, University ofFlorida, Gainesville, Florida 32611-0290, USAe-mail†Cooperative Extension Service, University ofGeorgia, Terrell County, PO Box 271, Dawson,Georgia 31742, USA‡Department of Chemistry & SoutheastEnvironmental Research Center, FloridaInternational University, Miami, Florida 33199,1. Nriagu, J. O. (ed.) Arsenic in the Environment Part 1: Cycling and Characterization (Wiley, New York, 1994).2. Brooks, R. R. (ed.) Plants that Hyperaccumulate Heavy Metals (Cambridge Univ. Press, 1998).3. Kabata-Pendias, A. & Pendias, H. in Trace Elements in Soils and Plants 203–209 (CRC, Boca Raton, 1991).4. Koch, I., Wang, L., Ollson, C. A., Cullen, W. R. & Reimer, K. J. Envir. Sci. Technol. 34, 22–26 (2000).5. Jones, D. L. Encyclopaedia of Ferns (Lothian, Melbourne, 1987).积累砷的蕨类植物耐寒，多功能，生长快速的植物，有助于从污染土壤去除砷有毒和致癌的土壤砷污染是非常广泛的。

英文文献小短文(原文加汉语翻译)

A fern that hyperaccumulates arsenic(这是题目，百度一下就能找到原文好，原文还有表格，我没有翻译)A hardy, versatile, fast-growing plant helps to remove arsenic from contaminated soilsContamination of soils with arsenic,which is both toxic and carcinogenic, is widespread1. We have discovered that the fern Pteris vittata (brake fern) is extremely efficient in extracting arsenic from soils and translocating it into its above-ground biomass. This plant —which, to our knowledge, is the first known arsenic hyperaccumulator as well as the first fern found to function as a hyperaccumulator— has many attributes that recommend it for use in the remediation of arsenic-contaminated soils.We found brake fern growing on a site in Central Florida contaminated with chromated copper arsenate (Fig. 1a). We analysed the fronds of plants growing at the site for total arsenic by graphite furnace atomic absorption spectroscopy. Of 14 plant species studied, only brake fern contained large amounts of arsenic (As;3,280–4,980 p.p.m.). We collected additional samples of the plant and soil from the contaminated site (18.8–1,603 p.p.m. As) and from an uncontaminated site (0.47–7.56 p.p.m. As). Brake fern extracted arsenic efficiently from these soils into its fronds: plants growing in the contaminated site contained 1,442–7,526p.p.m. Arsenic and those from the uncontaminated site contained 11.8–64.0 p.p.m. These values are much higher than those typical for plants growing in normal soil, which contain less than 3.6 p.p.m. of arsenic3.As well as being tolerant of soils containing as much as 1,500 p.p.m. arsenic, brake fern can take up large amounts of arsenic into its fronds in a short time (Table 1). Arsenic concentration in fern fronds growing in soil spiked with 1,500 p.p.m. Arsenic increased from 29.4 to 15,861 p.p.m. in two weeks. Furthermore, in the same period, ferns growing in soil containing just 6 p.p.m. arsenic accumulated 755 p.p.m. Of arsenic in their fronds, a 126-fold enrichment. Arsenic concentrations in brake fern roots were less than 303 p.p.m., whereas those in the fronds reached 7,234 p.p.m.Addition of 100 p.p.m. Arsenic significantly stimulated fern growth, resulting in a 40% increase in biomass compared with the control (data not shown).After 20 weeks of growth, the plant was extracted using a solution of 1:1 methanol:water to speciate arsenic with high-performance liquid chromatography–inductively coupled plasma mass spectrometry. Almostall arsenic was present as relatively toxic inorganic forms, with little detectable organoarsenic species4. The concentration of As(III) was greater in the fronds (47–80%) than in the roots (8.3%), indicating that As(V) was converted to As(III) during translocation from roots to fronds.As well as removing arsenic from soils containing different concentrations of arsenic (Table 1), brake fern also removed arsenic from soils containing different arsenic species (Fig. 1c). Again, up to 93% of the arsenic was concentrated in the fronds. Although both FeAsO4 and AlAsO4 are relatively insoluble in soils1, brake fern hyperaccumulated arsenic derived from these compounds into its fronds (136–315 p.p.m.)at levels 3–6 times greater than soil arsenic.Brake fern is mesophytic and is widely cultivated and naturalized in many areas with a mild climate. In the United States, it grows in the southeast and in southern California5. The fern is versatile and hardy, and prefers sunny (unusual for a fern) and alkaline environments (where arsenic is more available). It has considerable biomass, and is fast growing, easy to propagate,and perennial.We believe this is the first report of significant arsenic hyperaccumulationby an unmanipulated plant. Brake fern has great potential to remediate arsenic-contaminated soils cheaply and could also aid studies of arsenic uptake, translocation, speciation, distribution and detoxification in plants. *Soil and Water Science Department, University ofFlorida, Gainesville, Florida 32611-0290, USAe-mail: lqma@†Cooperative Extension Service, University ofGeorgia, Terrell County, PO Box 271, Dawson,Georgia 31742, USA‡Department of Chemistry & SoutheastEnvironmental Research Center, FloridaInternational University, Miami, Florida 33199,1. Nriagu, J. O. (ed.) Arsenic in the Environment Part 1: Cyclingand Characterization (Wiley, New York, 1994).2. Brooks, R. R. (ed.) Plants that Hyperaccumulate Heavy Metals (Cambridge Univ. Press, 1998).3. Kabata-Pendias, A. & Pendias, H. in Trace Elements in Soils and Plants 203–209 (CRC, Boca Raton, 1991).4. Koch, I., Wang, L., Ollson, C. A., Cullen, W. R. & Reimer, K. J. Envir. Sci. Technol. 34, 22–26 (2000).5. Jones, D. L. Encyclopaedia of Ferns (Lothian, Melbourne, 1987).积累砷的蕨类植物耐寒，多功能，生长快速的植物，有助于从污染土壤去除砷有毒和致癌的土壤砷污染是非常广泛的。

英语范文带翻译

英语范文带翻译《The Power of English》英语作为世界上最广泛使用的语言之一，具有强大的影响力。

从国际贸易和商务交流到科学研究和文化交流，英语都扮演着重要的角色。

在当今全球化的时代，掌握英语已经成为一种必备的能力。

首先，英语的广泛使用使得交流变得更加便利。

几乎在全世界的国际会议上，英语都是主要的工作语言。

这使得不同国家的人们能够更加容易地进行沟通和合作，促进了国际关系的发展。

其次，许多重要的科学研究成果都是用英语发表的。

因此，许多科学家和研究人员都需要具备良好的英语阅读和写作能力，以便与国际同行进行学术交流和合作。

此外，英语也是电影、音乐和文学作品的主要语言之一。

许多顶尖的作品都是用英语创作的，这使得英语成为全球流行文化的重要传播工具。

总之，英语的影响力不容忽视。

掌握英语不仅可以拓宽个人的视野，还可以为个人的成长和职业发展提供更多机会。

因此，学习和掌握英语已经成为当今社会不可或缺的能力之一。

"The Power of English"As one of the most widely spoken languages in the world, English holds great power and influence. From international trade andbusiness communication to scientific research and cultural exchange, English plays a vital role. In today's era of globalization, mastering English has become an essential skill.Firstly, the widespread use of English has made communication more convenient. English is the primary working language at almost all international conferences around the globe. This enables people from different countries to communicate and collaborate more easily, promoting the development of international relations.Secondly, many important scientific research findings are published in English. As a result, many scientists and researchers need to have good reading and writing skills in English in order to engage in academic exchanges and collaborations with international peers.Furthermore, English is also one of the main languages for films, music, and literary works. Many top-notch works are created in English, making it an important tool for the global dissemination of popular culture.In conclusion, the influence of English cannot be overlooked. Mastering English not only broadens one's horizons but also provides more opportunities for personal growth and career development. Therefore, learning and mastering English has become an indispensable skill in today's society.。

道路路桥工程中英文对照外文翻译文献

道路路桥工程中英文对照外文翻译文献中英文资料中英文资料外文翻译(文档含英文原文和中文翻译)原文：Asphalt Mixtures-Applications。

Theory and Principles1.ApplicationsXXX is the most common of its applications。

however。

and the onethat will be XXX.XXX “flexible” is used to distinguish these pavements from those made with Portland cement,which are classified as rigid pavements。

that is。

XXX it provides they key to the design approach which must be used XXX.XXX XXX down into high and low types,the type usually XXX product is used。

The low typesof pavement are made with the cutback。

or emulsion。

XXX type may have several names。

However。

XXX is similar for most low-type pavements and XXX mix。

forming the pavement.The high type of asphalt XXX中英文资料XXX grade.中英文资料Fig.·1 A modern XXX.Fig.·2 Asphalt con crete at the San Francisco XXX.They are used when high wheel loads and high volumes of traffic occur and are。

文档英文翻译

文档英文翻译Document Translation (700 words)Dear colleagues,I hope this message finds you well. I am writing to inform you about an upcoming training session that will take place next month.The training session, titled "Effective Communication in the Workplace," will be held on May 15th, from 9 am to 12 pm, in the conference room on the second floor. The session will be conducted by a renowned communication expert, Mr. John Smith.In today's fast-paced business environment, effective communication plays a crucial role in the success of any organization. This training session aims to provide participants with the necessary tools and techniques to enhance communication skills in the workplace.During the session, Mr. Smith will cover a wide range of topics, including verbal and non-verbal communication, active listening, conflict resolution, and communication barriers. The training will be interactive, with group activities and case studies to ensure maximum engagement and learning.By participating in this training session, you will learn how to improve your communication skills, foster positive relationships with colleagues, and resolve conflicts in a professional manner. These skills are essential for career advancement and personal growth.To register for the training session, please reply to this email with your name and department by May 1st. Space is limited, so make sure to secure your spot early. Upon registration, you will receive a confirmation email with further details.As part of our commitment to employee development, this training session is provided free of charge. However, we kindly request your full cooperation and commitment to attend the entire session.Please feel free to contact me if you have any questions or require further information. I look forward to seeing you at the training session.Best regards,[Your Name]Translation:亲爱的同事们，希望你们一切都好。

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HUNAN UNIVERSITY英文文档翻译（英文原文）设计（论文）题目High Quality Web-ApplicationDevelopment on Java EE Platform 学生姓名张刚专业班级10级软件工程5班指导老师李珩系主任（院长）林亚平评阅人2014 年 4 月16 日High Quality Web-Application Development on Java EE Platform Harshad B. Praj'apati Information Technology Department Dharmsinh Desai University Nadiad, India Vipul K. Dabhi Information Technology DepartmentDharmsinh Desai University Nadiad, India Abstract：Quality of web-applications plays major role in its success. And the high quality web-application is really possible by following high quality web engineering process. The use of strong web-application architecture with strong development platform not only make web-applications robust and of high quality but also give web-application an ability to meet changing and demanding customer requirements in efficient manner. A Model View Controller （MVC) design pattern has remained fundamental architectural design pattern even after great evolution in architectures of user interactive applications. In this paper, we discuss the support for achieving quality attributes for the web-application, the support for web-application development process and the support for meeting demanding features of web application on Java EE platform. This contribution will help a lot for small scale as well as large scale web-application development and for moulding web-application into a future's high quality finished product from inception phase itself.Key-words:MVC;Web Application;Java EE;Quality Attributes;High Quality Web Development.1、IntroductionAlong with the great demand of web-applications in the era of pervasive and ubiquitous computing, a number of issues related to quality of web-applications [1] have also gained a great attention in web-application development process. Great competitions in the web-application business compel web-application developers more quality conscious. It will be of great value if a web-application could survive against demanding and changing customer requirements, and changing business requirements.Building high quality web-application is really a difficult,and challenging task. But the support for right development process, methods, tools, and people really make possible to achieve high quality of web-application. As the development platform influences associated development process, methods, tools, and people, it really plays a major role for making development process simple, efficient, and robust and for achieving high quality of web-application.Java EE platform [7] is open, standard based n[8] hardware and OS independent platform on which distributed enterprise applications can be developed and run. As the applications targeted on Java EE platform are vendor neutral, the organization does not face the problem of vendor lock-in. The Java EE platform based web-applications use Model/View/Controller (MVC) [2] design pattern [3] for three architectural components: presentation logic, controller logic,and entity/business logic. We discuss MVC design pattern used in traditional GUI based applications and also discuss how it is adapted in the architecture of Java EE platform based web-applications. We analyze the Java EE platform as per (i)quality attributes requirements[1] of web-applications (ii) related support in development process (iii) related support to involved people during development, and present our results in quick digestible form.Our results indicate that web-application development on Java EE platform has a great value in providing high quality to web-application, satisfying changing customer requirements and satisfying changing business requirements.The presented work, in this paper, concentrates on achieving high quality for web-application developed on Java EE platform from different perspective of overall development process. The related work in the category is as follows. The Web-application development using the MVC design pattern can be found in [4]. The MVC design pattern in and JSP frameworks can be found in [5]. The quality characteristics and attributes for web sites can be found in [1].The Section II discusses the MVC design pattern in traditional GUI application architecture and its adaptation in web-application architecture. The Section III presents web-application development process and available support for it on Java EE platform. The Section IV presents available valuable features for web-application on Java EE platform. Section V presents the result of Java EE platform analysis for achieving high quality of web-application and its components. And finally the Section VI presents the conclusions and direction for future research work.2.The web-Application architecture on Java EE platform using MVC Design patternAn MVC [2] design pattern [3] has remained fundamental architectural design pattern even after great evolution in the architectures of user interactive applications. So,we would like to provide short introduction on it to the readers before we discuss its usage in web-application architecture on Java EE platform [7].A.The MVC design patternThe MVC design pattern is widely used by programmer,software designer, and GUI component developer to architect the widget they are developing. The MVC design pattern, as shown in Figure 1, consists of three kinds of objects: Model, View, and Controller, which handle three basic responsibilities of any widget: entity(data), boundary (presentation), and control (behavior) respectively. The model encapsulates application data and business logic; the view handles rendering of application data and visual interface to user; and the controller handles user's interaction with the application.The MVC design pattern separates views and models by establishing subscribe/notify protocol between them. A view object must ensure that its appearance reflects the state of the model. The model object is independent of both view and controller objects, so it is possible to have multiple views (presentations) of same model (data). All associated views can subscribe with model and model notifies them about its state change.When user interacts with the MVC design pattern based GUI form or page, all fired events are captured by controller object. The controller then decides whether the fired event is related to change in state of model or change in state of view.As an example, when the user fires event related to changing value in text field, the controller calls the method of model to change its content. But if the user performs horizontal or vertical scroll-up or scroll-down, the model content does not change and only the view should be notified to reflect the changes in its appearance.B.Web-Application Architecture in Java EE platformIn a stand-alone application, generally the model, view, and controller live on the same machine. But in a distributed web-application, the application architecture is different; however,the MVC design pattern is so general that it can still be applied to its architecture. The Java EE platform based web-applications utilize MVC based architecture as shown in Figure2.In Java EE platform based web-application architectures, the servlet [10] component is used as a controller; the Java Bean component is used as a model; and te Java Server Pages [11](JSP) page isused as a view template. The Enterprise Java Bean (EJB) [12]l can be used as a.model, which can be located environment unlike Java Bean.The JSP technology is used for creating view; and te JSP page is considered as a view template. The execution of this JSP page generates the view - HTML [13] content.The Java EE platform provides many system services to web-application components. Java Bean platform provides support for security, authentication, authorization ,transaction. The database connection management is handled by the Java EE platform and it is configurable externally in deployment descriptor, so the model component does not need to worry about those details. Thus, the responsibility of model component is just to handle only business data and business logic. The authentication and authorization service is also provided by the Java EE platform to servlet and this service is also configurable externally in deployment descriptor. The container mediates between the servlet components and web browser for each HTTP [14] requests and applies the services as configured d in the development descriptor.3.Web-Application Development process on Java EE platformIn this section, we discuss about web-application development process in Java BE platform [7] and the support available for web-application development from the Java EE platform.A.Web-Application development processA typical development process on Java EE platform involves following tasks: designing,coding,creating deployment descriptor, packaging, assembling, and deployment. These tasks are also applicable to web-application development also. The Java EE platform specification [8]specifies the roles and their responsibilities in Java enterprise application development. We present here these roles and their,responsibilities in various phases of web-application development process.The Table I shows the major roles played by involved people during development, their role based responsibilities and their involvement in specific development phases.B.Support In Development ProcessThe development becomes efficient if tools/technology support is available during coding, testing, integration,deployment and maintenance phases. Here, we discuss how Java EE platform provides support during all these phases to make development process efficient.1). Support in Coding: The development environment should provide facilities of avoiding typos, require minimal effort for adding new functionalities, and provide support for standards based technology and tools. Very sophisticated development tools are available for software development on Java EE platform. The Netbeans IDE [15] and Eclipse IDE [16] are among them. These IDEs are equipped with sophisticated editors. Few of such features are auto code completion, re-factoring, code insertion, syntax highlighting to avoid typo errors, fixing package imports, getter/setter handling,and code insertion for calling of EJBs.These features help a lot while developing servlet, JSP, JavaBean and EJB components.2).Support in Testing: Good debugging and unit testing support are basic requirement in testing process. The Java platform [9] comes with debugger jdb and the IDEs such as Netbeans and Eclipse provide good debugging support. The JUnit [17] provides regression testing framework for unit testing.It can accelerate programming and increase the quality of code. It provides API for easily creating Java test cases, comprehensive assertion facilities, test runners for running tests, aggregation facility and reporting. All these features help the developers from embedding several println( calls in actual code and manually preparing test results in structured fashion. Adding and then removing individual println( for testing purpose is very frustrating task;and it can not be replicated into similar classes easily.3)Support in Integration and Deployment:The integration and deployment of web-application should be as easy as possible to minimize deployment time and downtime. And the deployment process should be independent of different hosting application server providers.Since Java technology[9] is standard based,the web-application developed using it will run on any Java EE compliance[8] application server without any modification in code.The web-application is free from vendor lock-in. The Java EE platform specifies vendor neutral configuration in standard deployment descriptor and vendor specific deployment descriptor files.The vendor specific configuration includes abstract security roles mapping with target security system, data source references, and other resource configuration.4)Support in Maintenance: The Java EE platform specification clearly specifies the roles and responsibilities of different involved people. As discussed above. All these roles apply to web as well as enterprise module/application development. Three main roles: developer, assembler, and deployer simplify the whole development task. All three basic components: servlet, JSP and JavaBean/EJB components can be implemented and maintained independently by servlet developer, JSP developer, and Java/EJB developer,respectively.4.Valuable Features For Web-Application On Java EE PlatformAs Java technology [9] is object oriented and platform independent, many features such as scalability, portability, reusability, security, high performance, flexibility are inherent in Java classes or components. Both Servlet [10] and JavaBean components are java classes, so above stated features are inherent in them. This also applies to EJB [12] component also,which is collection of java classes and deployment descriptor.JSP [11] scripting language is used to create JSP page.Although a JSP page looks like an HTML[13] kind of page, at execution time it is a translated java class which gets executed. In short, all three components: servlet, JavaBean/EJB, and JSP that are used in implementing MVC [2] design pattern [3] on Java EE platform [7] are scalable, portable, reusable, secure, high performance, flexible. The following available features on the Java EE platform add value to web-application. And in certain business/customer requirements, they are indispensable. A.SecurityThe communication security (confidentiality and integrity) is provided through SSL [18] support.For SSL support, the application server providers. Since Java technology [9] is SSL connector should be configured on the Java EE container and the server certificate signed by Certifying Authority (CA)[18] should be installed on the Java EE container.A Java EE based web-application is configured for confidentiality and integrity declaratively. The Figure 3 shows three configurations related to security aspect of web-application. The part shown under <! SECURE COMMUNICA TION --> is related to confidentiality and integrity of data that gets transmitted between Java EE container and web-browser.The part under in Figure 3 declares that user authentication must be performed before granting access to resources. And it declares that authentication method is of type FORM.The authorization part includes which operations on which resources are allowed by which users. The part inside <web-resource-collection> indicates which resource is access controlled indicated by <url-pattern> and which operations are allowed indicated by <http-method>. And which users are allowed to perform selected operations on selected resources is configured underpart.B.Transaction ProcessingJava EE platform supports container-managed transaction and bean managed transaction for session bean and message driven bean (MDB) [12]. In Container-managed transaction,the enterprise bean transaction's boundaries using begin transaction and commit transaction. Instead, the transaction is configured in deployment descriptor. The container begins a transaction immediately before abusiness method in enterprise starts. It commits the transaction just before the business method in enterprise bean exits. If an exception gets generated during business method execution, the container will automatically roll back the transaction. The support for only either a single transaction or no transaction at all is available from container managed transaction. For fine-grained control over transaction, the bean-managed transaction can be used. Here the code in the session or message driven bean explicitly marks the boundaries of the transaction using Java Transaction API(JTA).c.Support For Session ManagementMost of the web-applications on the Internet handle the session using cookie mechanism. So, the users, who are accessing such web-applications from browsers that do not support cookie mechanism, cannot participate in session and will not be able to access any personal resource. The encode URL mechanism on Java EE platform automatically determines whether the client's browser supports the cookie or not, and then decides how the information about session identification should be stored on client machine. If the client's browser does not support the cookie or the cookie feature has been disabled by the user, the session id value is encoded in URL part that client is going to use .D.Customized error-pagesIf a user is trying to access a resource, which is not available, the server shows the error message 404 (SC_NOT_FOUND) resource not found exception. Instead, the error page containing beautiful description in non-technical English language is shown, the user will really understand the cause of problem and sometimes feels that you care for the users. A good web-application should not show the error messages generated by application server or web-server directly to users. As an example, a web-application can be configured for 404 resource not found exception as shown in Figure 4. Using this configuration, the error pages for user-defined error messages can also be specified. Instead of error-code, the exception-type can also be specified. The resourceNotFound.html file would contain error message in a language understandable to user.E.Internationalization/Multi-language SupportIf information is provided to users in a language that they understand and use, it would be easier for users to understand and use the application. The Unicode support for strings is inherent in the Java language [9]. The language also supports locale specific formatting of number, currency, date, time, etc. All such supports help a lot in making the Java EE platform [7]based web-application an internationalized one and they also increase the usability of web-application across the world.5.Achieving Quality For The Web-Application And Its Components On Java EE PlatformThe quality of individual components also affect in achieving overall quality of whole application. We, first, present here important quality attributes of components and how these quality attributes are satisfied for all three components: Model, View, and Controller. The related analysis and results are presented in Table II.Second,the design of any web-application includes various design tasks [6]. These design tasks and available support for them on Java EE platform [7] are presented in Table III. Third, the overall support for quality attributes [1] to web-application as a whole determines the overall quality.These quality attributes, criteria involved in achieving these quality attributes andavailable support for them on Java EE platform are presented in Table IV.6.ConclusionWe analyzed the Java EE platform as per quality attributes requirements of web-applications and found that quality attributes: usability, functionality, reliability, efficiency and maintainability can all be satisfied with it. From the discussion it is evident that Java EE platform simplifies the designing,development, deployment, integration and testing process of web-application without compromising high quality. It also empowers the development of web-application with scalability,portability, interoperability, reusability, flexibility and security.Many frameworks for web-application development are available on Java EE platform, but no one is found providing support for high quality distributed web-application. In future,we intend to work on developing distributed high quality web-application framework on Java EE platform.7.References[1] Olsina, L. et al., "Specifying quality characteristics and attributes for web sites," in Proc. 1st ICSE Workshop on Web Engineering, ACM, Los Angeles, May 1999.[2] G. E. Krasner and S. T. Pope, "A Cookbook for Using the Model-View- Controller User-Interface Paradigm in Smalltalk-80," Journal of Object- Oriented Programming, August/September 1988. [3] E. Gamma, Design Pattems: Elements of Reusable Object-Oriented Software, Addison-Wesley, 1994.[4] A. Leff and J. T. Rayfield "Web-application development using the view/controller design pattem," in Proceedings of the 5th IEEE International Conference on Enterprise Distributed Object Computing, 2001, pp. 118-127.[5] F. A. Masoud, Dana. H. Halabi and Deema. H. Halabi, " and JSP frameworks in model view controller implementation," in Proceedings of Information and Communication Technologies, 2006.ICTTA'06, pp. 3593-3598.[6] R. S. Pressman, Software Engineering: A Practitioner's Approach 6e, McGraw Hill, 2005.[7] Sun MicroSystem. Java Enterprise Edition. http:// /javaee/[8] Java Community Process. /[9] Sun MicroSystem. Java Technology. .[10] Sun MicroSystem. Java Servlet Technology Implementation and Specification.[11] Sun MicroSystem. Java Server Pages. https:///products/jsp/[12] Sun MicroSystem. Enterprise JavaBeans Specifications.[13] W3C Specifications. [14] RFC: http protocol, /Protocols/ifc2616/rfc2616.html[15] RFC : SSL, www.ietforg/rfc/rfc2246.txt。

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