论文外文文献翻译3000字左右

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外文资料翻译3000

无锡职业技术学院外文翻译The energy-conservation of freezer, with automaticallyingcontrol1 A present freezer of automatic control current situationsThough the cold storage self-control having been popularized all round, but great majority cold storages putting particular emphasis on is only a safeguard face to face , the energy conservation having increased Wenku picking up the self-adjustment and cold storage measuring and controlling, to entire system relates that under the control of seldom or. Even if another aspect, already getting the all-round universal safeguard, before actual condition in working can't admit of no sanguine, } pins up the cold storage self-control facilities having become "ear of the deaf person" even having become furnishing and decorating decorating front appearance only. The Shanghai cold storage association has done investigation in recent years to Shanghai area ammonia refrigerating system cold storage safeguard and autocontrol condition , concrete conditions has seen that are what form l shows. A spot of should inquire into a data as the leopard has reflected current cold storage self-control general situation Form what 1 shows a self-control interposes and runs status though the very good cold storage only having 5 tidal current and direction accounting for 9% of the number counting, but it is these cold storages to have represented a nowadays. With the development of electron technology, the self-control component is more and more advanced , changeable procedure controller (PLC) and the PC function are more and more strong , self-control procedure is more and more perfect, system optimization and the energy conservation consciousness are also more and more strong. The cold storage energy conservation and the autocontrol relation are more and more rapid and intense , need the cold storage energy conservation to be ready for and composing much better, do well in and be engaged in better the autocontrol vitally needing right away. Above-mentioned example adopted by five cold storages representing tidal current in the nowadays and advanced level has all got the pretty important effect to realizing cold storage energy conservation.2 How be ready for cold storage energy conservation autocontrolFundamental above-mentioned content starting point is the cold storage taking ammonia as all together style refrigeration working medium refrigerating system , is that refrigeration working medium decentralization, allows all together style , all together style refrigerating system cold storage to have got very big development , whose self-control degree overtops also sometimes the all together style refrigerating system cold storage taking ammonia as refrigeration working medium on behalf of a hydrocarbon with the thick gravy nowadays. Many working mediums are unlike cold storage of system of all kinds extensive use, content having enriched cold storage autocontrol tremendously, application in energy conservation at the same time also has provided the vast scope for one's ability to autocontrol in the cold storage.2.1 Cold storage energy conservation autocontrolCold storage energy conservation autocontrol is energy conservation under the control of procedure establishment and self-control component selecting and using from the content coming to study the autocontrol developing cold storage energy conservation's relates that mainly whom.The firm, special field designing institute or capable unit as self-control component may assume cold storage energy conservation autocontrol research and develop equally. The firm and the designing institute make a contribution to some extent without exception already by now within that field. Cold storage energy conservation autocontrol can be developed exploitation commonly by firm and designing institute best (not bad firm give first place to, the designing institute coordinates) , perfects in the process of putting into effect using an unit the new product getting into form and grinding unceasingly to get rich.2.2 Energy conservation autocontrol specific items design prepares a cold storage putting composition into practice.That a specific items energy conservation autocontrol's puts process into practice sometimes is that the purpose checking K amendment , reaching energy conservation until according with design demand by designing , assembling debugging , pilot run , effect is extremely. While the project requires that content is changed into a ratio to some extent, may revise K at any time satisfying a request.The cold storage energy conservation sometimes requires that the advanced refrigeration switches over to prepare , right system mates , effective the words emergency measure and strict operation manage to manage to be put into effect, be requiring that the refrigeration technician goes ahead in the basis optimizing refrigeration process design right now, know well that energy conservation needs , be tied in wedlock this project characteristic , the flow chart designing out entire cold storage energy conservation autocontrol. Ability accomplishes whose electricity self-control design according to the self-control flow chart , the electricity self-control technician , being able to wield whose professional knowledge at the same time, makes self-control technological process be simplification and an optimization more. Cold storage energy conservation is a cold storage autocontrol important component , all cold storage autocontrol is composed of refrigeration and electricity two parts content without exception , K makes cold storage energy conservation be carried out to the letter only when ability makes cold storage autocontrol come into effect in the field of two under technician's making joint efforts.3 Cold storage energy conservation autocontrol pilot run is also one very important ring , echoes the usage unit and the special field firm in the pilot run keeping close connection , uses an unit to discuss working effect , deliberates amendment measure with special field firm and.Energy conservation is one of cold storage autocontrol purpose.3.1 Adjusts storehouse temperature adjustment in the past about that the storehouse temperature and the evaporation temperature adjust the parametric storehouse of3.1.1 Storehouse temperature controlMultiple spots temperature temperature giving first place to dyadic adjustment of place, correct evaporate the temperature not sometimes doing adjustment , very difficult to reach good energy conservation effect.The ideal storehouse temperature control mode is that wind and their air-out temperature is entering parameter with the storehouse mean temperature , the air cooler moving forward , works out appropriate under the control of procedure , measures by the fact that PLC is in progress. So-called Wenku adjusts the request being able to reach energy conservation , also can satisfy the need that some storehouse high-accuracy temperature adjusts, self own but the accuracy reaching 0.250 C requires that energy conservation makes an appointment with 10% at present.3.1.2 Regard to relatively evaporate temperature higher cold right away be in no energy conservation operation statePs stop being unlike the diversity evaporates because K couplet operation can only work under evaporating the temperature with a with a systematic refrigeration compression engine evaporating the cold room of temperature temperature cold if K couplet work, with regard to relatively evaporate temperature higher cold right away be in no energy conservation operation state, should cold hot load increasingly be promoted to a higher post increasingly no energy conservation. Ought to try one's best to avoid this condition appearing. One machine reviews the cold storage method of work pair in freon refrigerating system , add the back pressure valve on time of high temperature warehouse air tube , add single check valve on time of low temperature warehouse air tube, be representative block of wood energy conservation methodof work, do not respond to encourage but suitable abolish.3.1.3 Unexpected turn of events evaporates temperature adjustmentSome one work state lower if evaporate temperature can use storehouse hot load and refrigerating system refrigerating output be parameter be in progress adjustment, then now that can reach energy conservation purpose can make energy adjustment be more rational. The sort Er Yan , refrigerating system evaporation implement and refrigeration compression engine equipment can satisfy maximal load need basically all. Load falls off but the refrigerating output can not make corresponding adjustment in time if the cold room is hot, the refrigerating output and hot load being that the refrigerating system evaporation temperature will may act in responses reduces , uses a compression engine reach a new balance burning. The lessening evaporating the temperature has increased but the refrigerating output evaporating an implement conversely but , has faced the hot load that self own cuts down taking form surely frequently opening the consequence staying. Evaporate temperature 10 C per change, electric energy about 3 ~ 5% acting in responses adding or subtracting. Be energy conservation on making system burn in another ideal balance of } if raising the evaporation temperature in time,have avoided freely not having achieved not only, having decreased by the refrigeration compression engine's frequently starts , is the energy conservation measure achieving two things at one stroke. Not changeable fundamental refrigerant rate of flow rate of flow evaporating an implement adjusts.3.1.4 Changeable rateChangeable rate of flow adjustment ammonia in the past refrigerating system; Freon system evaporates the implement refrigerant rate of flow , great majority achieve simple proportion measures. The air cooler air mass flow great majority do not measure or speed and the electric fan platform number measure only when two. This two kinds parametric rate of flow adjustment all are cold the adjustment assigning the equipment refrigerating output and storehouse temperature direct relevance , one of the content being also that the cold storage energy conservation self-control responds to in taking seriously with the storehouse.3.1.5 Fetch the warehouse taken heightSets up right under the control of accuracy and adds the storehouse temperature setting up the commodity and different storage period controlling the different storehouse , different stock out of gauge having no equal to and their under the control of accuracy request. Set off from the energy conservation angle, the storehouse temperature ought to take height not choosing low , the mild high-accuracy controlling accuracy ought to fetch the warehouse taken height , insisted to run after face to face unnecessarily low low controls as long as not affecting the commodity quality.To the cold room of many } storehouse temperature under the control of, except original storehouse temperature setting value, suitable add set up Kuwen transfinite controlling value. This pair of factors storehouse temperature adjusts deflect but premature bringing into service being able to achieve when refrigerating system needs bringing into service , incapable because of } pins up the storehouse temperature; Can not make cold according to reality that time at intervals, refrigerating system stops working untimely Ding , fully utilizes now having energy K avoid equipment or systematic frequently open Ding.3.1.6 Set up avoiding meeting high o perationInterpose avoid meeting high o operation under the control of electric power short-supplied be the universal phenomenon that current all parts of the country there exists in everywhere, huge bad especially heavy electric power of power consumption o grain is short-supplied , the electric charge o grain price differences puts into effect in a lot of city and price differences play big as early as successive steps for this purpose. Under the premise not affecting commodity mass, the cold storage is set up avoiding meeting high o peration , beneficial to the electrified wire netting cuts o repair a valley , help overall situation energyconservation on macroscopic view; Microcosmic Er Yan operation also beneficial toreducing a cold storage cost.3.2 Cold room relative humidities adjust cold room relative humidity adjustmentCold room relative humidities adjust cold room relative humidity adjustment and the temperatureadjusts the method similarity repeating description unnecessarily. But in general cold room relative humidity is in 85 ~ the relative humidity that the also a little bit cold room demands is lower than or the relative humidity higher than the be 98%, but some crops of relative humidity kind of quality warehouse being range , for instance some gases turn to obj1 = " 位" exchange the warehouse request demands 45% to be 40 ~ between 95%. During the period of high relative humidity adjustment and low relative humidity adjustment, Youyin attaches importance to energy conservation measure.3.2.1 High relative humidities adjust the adjustmentHigh relative humidities adjust the adjustment demanding the cold room to high relative humidity , are going try one's best to reduce the logarithm averages difference in temperature (2 advisable K) between the refrigerant temperature and the storehouse temperature, return refrigerating system back when being necessary but adopt to be loaded with the cold agent first; May adopt air defrosting K besides with defrosting water restoring to the storehouse. That this two measure is given by autocontrol being put into effect, is effective energy conservation method , the domestic trade headquarter has not been 20,000 tons of Long Kou City gas that the research institute designs obj1 exchange a warehouse being a very good example of one 17 }.3.2.2 Low relative humidities adjust the adjustmentLow relative humidities adjust the adjustment demanding the cold room to low relative humidity , controlling also should be ready for two aspect mainly. One is on the basis selecting and using dehumidification method and dehumidification machine stopping bringing quantity of heat into cold room to the full, hot few cold p rooms load controlling good dehumidification while procedure, reaching the relative humidity request. It's two is to avoid air current organizing the wet load controlling fever of taking now and then entering unnecessary outside; Once had the wet low one } low temperature crops kind of quality warehouse, wet load roughly accounts for about35% of plain meter { load from invading the heat within being put in storage outside.3.3 Measures about providing liquid wayDirect swelling is for liquid's expanding directly to be for liquid's being that great majority thick gravies pin up the confession liquid method that ammonia system adopts on behalf of hydrocarbon (include freon) system and }. This provides liquid method with adopt the heating power expansion valve to provide liquid in the past basically , self problem, has no way to realize the energy conservation purpose since choosing the type , adjustment and product. Electron expansion valve appearing measures combining with selecting parametric Kuwen of temperature much , can realize energy conservation operation fairly good, sort but energy conservation 10%. But the thick gravy generation hydrocarbon refrigerating system heating power expansion valve product already be commensurate to maturity and still have the special-purpose PLC Kuwen controller, for a variety of reasons, adopt extension , wait for to increase energy not yet commonly in cold storage refrigerating system. Working hot shot degree of ammonia refrigerating system evaporation implement is not big , degree of difficulty is under the control of relatively bigger , there is no at present still mature ammonia using electron to expand ? ? valve product. The system冷库节能与自动控制1 当前冷库自控现状冷库自控虽然得到了全面普及，然而大多数冷库的侧重面只是安全保护，或者还增加了温库捡测和控制，对于全系统的自动调节和冷库的节能控制还很少涉及。

毕业论文(设计)外文文献翻译及原文

金融体制、融资约束与投资——来自OECD的实证分析R．SemenovDepartment of Economics，University of Nijmegen，Nijmegen（荷兰内梅亨大学，经济学院）这篇论文考查了OECD的11个国家中现金流量对企业投资的影响.我们发现不同国家之间投资对企业内部可获取资金的敏感性具有显著差异,并且银企之间具有明显的紧密关系的国家的敏感性比银企之间具有公平关系的国家的低.同时，我们发现融资约束与整体金融发展指标不存在关系.我们的结论与资本市场信息和激励问题对企业投资具有重要作用这种观点一致，并且紧密的银企关系会减少这些问题从而增加企业获取外部融资的渠道。

一、引言各个国家的企业在显著不同的金融体制下运行。

金融发展水平的差别(例如，相对GDP的信用额度和相对GDP的相应股票市场的资本化程度），在所有者和管理者关系、企业和债权人的模式中，企业控制的市场活动水平可以很好地被记录.在完美资本市场,对于具有正的净现值投资机会的企业将一直获得资金。

然而，经济理论表明市场摩擦，诸如信息不对称和激励问题会使获得外部资本更加昂贵，并且具有盈利投资机会的企业不一定能够获取所需资本.这表明融资要素，例如内部产生资金数量、新债务和权益的可得性，共同决定了企业的投资决策.现今已经有大量考查外部资金可得性对投资决策的影响的实证资料（可参考，例如Fazzari（1998）、 Hoshi(1991)、 Chapman（1996）、Samuel(1998））.大多数研究结果表明金融变量例如现金流量有助于解释企业的投资水平。

这项研究结果解释表明企业投资受限于外部资金的可得性。

很多模型强调运行正常的金融中介和金融市场有助于改善信息不对称和交易成本，减缓不对称问题,从而促使储蓄资金投着长期和高回报的项目,并且提高资源的有效配置（参看Levine（1997)的评论文章）。

因而我们预期用于更加发达的金融体制的国家的企业将更容易获得外部融资.几位学者已经指出建立企业和金融中介机构可进一步缓解金融市场摩擦。

论文外文文献翻译3000字左右

南京航空航天大学金城学院毕业设计（论文）外文文献翻译系部经济系专业国际经济与贸易学生姓名陈雅琼学号2011051115指导教师邓晶职称副教授2015年5月Economic policy,tourism trade and productive diversification（Excerpt）Iza Lejárraga,Peter WalkenhorstThe broad lesson that can be inferred from the analysis is that promoting tourism linkages with the productive capabilities of a host country is a multi-faceted approach influenced by a variety of country conditions.Among these,fixed or semi-fixed factors of production,such as land,labor,or capital,seem to have a relatively minor influence.Within the domain of natural endowments,only agricultural capital emerged as significant.This is a result that corresponds to expectations,given that foods and beverages are the primary source of demand in the tourism economy.Hence,investments in agricultural technology may foment linkages with the tourism market.It is also worth mentioning that for significant backward linkages to emerge with local agriculture,a larger scale of tourism may be important. According to the regression results,a strong tourism–agriculture nexus will not necessarily develop at a small scale of tourism demand.It appears that variables related to the entrepreneurial capital of the host economy are of notable explanatory significance.The human development index(HDI), which is used to measure a country's general level of development,is significantly and positively associated with tourism linkages.One plausible explanation for this is that international tourists,who often originate in high-income countries,may feel more comfortable and thus be inclined to consume more in a host country that has a life-style to which they can relate easily.Moreover,it is important to remember that the HDI also captures the relative achievements of countries in the level of health and education of the population.Therefore,a higher HDI reflects a healthier and more educated workforce,and thus,the quality of local entrepreneurship.Related to this point,it is important to underscore that the level of participation of women in the host economy also has a significantly positive effect on linkages.In sum, enhancing local entrepreneurial capital may expand the linkages between tourism and other sectors of the host country.Formal institutions and their regulatory control of the market,proxied by the size of the government and price controls,were not found to have significant effects on linkages formation.Despite the importance of democratic governance,this was not identified as a key determinant either.On the other hand,the significance of informal institutions accords with the clustering dynamics inherent in tourism,in which linkages are formed on the basis of self-enforcing“relations-based”governance.Also,informal structures cost less than formal,rules-driven institutional frameworks for entrepreneurship.Therefore,highly formalized regulations can deter the spontaneous and cost-driven coordination among potential local suppliers and the potential buyers of the tourism economy.One type of formal institutions that does matter is policing and vigilance.As would be expected,the results show that countries with higher incidence of violence or crime are significantly associated with lower levels of tourism linkages.Indeed, the coordination of providers in tourism clusters depends fundamentally on trust among local entrepreneurs and trust can hardly flourish in an environment characterized by social conflict.Equally important,the perception of violence on the part of tourists and hotels will dissuade tourists from venturing beyond the safe boundaries of the“enclave”hotel resort.Finally,hotel managers and other foreign investors in the tourism economy will be less inclined to maintain productive relations with the host economy in the absence of predictability and stability. Therefore,investments in institutions that maintain safety and a perception of safety,in the host economy appear critical for spawning coordination.While all country domains may be playing a role in fostering or hindering linkages, the business environment seems to exert an overriding influence on linkages.After controlling for a country's natural endowments,level of development,and institutional maturity,the business environment on its own explains almost20%of cross-country variations in linkages.In particular,the level of corporate taxes in the host economy is associated with the most significant adverse effect on the formation of linkages,in conformity with the lower-cost motivation underlying tourism-led linkage creation.Also,a widespread usage of internet is alsosignificantly associated with a positive effect in the ability of suppliers to orchestrate coordination in tourism linkages.Moreover,the results suggest that there could be a role for government in improving trade facilitation and reducing transportation costs.Also,maintaining an open trade regime seems to be critical for the emergence of linkages.This underscores the importance of not protecting inefficient economic activities and opening potential products for tourism demand to competition.Although trade barriers may indeed serve to prod investors in the tourism economy to procure domestic goods, they will also hinder the competitiveness of local producers.Shielded from imports, local producers will not have the incentives to meet the international quality standards of the products needed by the tourism economy.Yet,quality expectations, possibly more so than costs,will likely inform the procurement decisions of the tourism economy.Concerning the relative magnitude of the effects of the different domains on linkages,the business environment and trade regulations stand out.The independent contributions of these domains,that is their ability to explain variations in the dependent variable when no controls for other domains are applied,amount to53%and 43%,respectively.The level-of-development domain follows with25%explanatory power,while the domains covering institutions and endowments provide an independent contribution of23%each.The implications of the analysis should be considered in light of its limitations. Causal direction cannot be fully substantiated,because we use a cross-sectional approach due to data limitations.In the absence of time-series for the variables at hand,it is not possible to test for causation.While the explanatory variables concerning natural endowments are exogenous,some of the other explanatory variables could potentially be subject to reverse causality.That said,there do not seem to be a priori strong conceptual reasons that would lead us to believe that the degree of tourism linkages critically affects trade policy,the quality of institutions, and other variables of our model.Moreover,the risk of encountering problems of reverse causality is mitigated by the observation that several longitudinal studies have established a causal relationship that runs from higher levels of economic development Eugenio-Martin et al.(2008)or a better business environment(Barrowclough,2007and Selvanathan et al.,2009)to the development of the tourism sector,rather than the other way around.Finally,the construction of the dependent variable as a ratio of indirect to direct tourism expenditure makes the reverse causality hypothesis less compelling. While it might be expected that an expansion of the tourism sector that increases total revenues and employment opportunities might have an impact on the explanatory variables,it is less evident that a change in the composition of tourism revenues, as implied by a change in the LINK variable,would have such an effect.That said, the confidence in our findings would clearly be further enhanced,if supported by results from future studies based on longitudinal designs.The scientific environmental ethics plays a key role in the recognition of the human—environment interactions．Modern environmental ethics is the philosophical rethinking of modern human race environmental behavior．The development of environmental ethics theory as well as its application in reality．determines the viewpoints of environmental ethics．Sustainable development implies harmony on human-environment interactions and intergeneration responsibility，with emphasis on a harmonious relationship among population，resources，environment and development，so as to lay a sustainable and healthy foundation of resources and environment for future generations．The harmonious society construction in China that is raised by the Chinese central government should be covered by environmental ethics．The connotation of open environmental ethics includes a respect for nature．care for the individual human race．and respect for the development of future generations，which means giving consideration to natural values．individual and human race benefits and welfare across generations．The role of environmental ethics in regional development consists of cognition，criticism，education，inspiration，adjusting，legislation and promoting environmental regulations．The major problems in regional development are extensive resource exploration，fast population growth irrational,industrialstructure.Unfair welfare distribution and the twofold effects of science and technology development．The formulation of environmental ethics that aims at regional sustainable development，can not only harmonize the relationship of population，resource，environment and economic development，but also guide behavior selection，push social and political system transformation.strengthen the legal system，and raise environmental awareness of the public．Human races face severe global challenges in resources，environment，population and poverty．To solve these problems science and technology should be developed on one hand，and human-environment interactions should be adjusted on the other hand．Modem environmental ethics is the philosophical review on modem human race environmental behavior．Environmental ethics can be a view point as the moral perception of the relationship between humankind and nature in general．The keystone of sustainable development is on harmonious human．environment interactions．with an emphasis on sustainable environmental ethics．Environmental ethics and sustainable development are key issues in the study of man．1and system，as well as a precondition to regional development(Zheng，2005a)．Though there exists theoretical divergence in different environmental ideologies．some general understandings can also be obtained：human races are the only ethical agents on earth；the essence of the environmental crisis is a cultural and value crisis；future generations have the same right as current generations，especially on survival space；differences should be made between human race and other entities on earth，at the same time they are an undivided union；the capability of the earth is limited．Based on the above general understandings．it is possible to form a more open and sustainable environmental ethics．A more open and sustainable environmental ethics has some special connections．To respect and treat nature friendly means to acknowledge the value and right of nature，that is to say,minimum hurt criterion，basic benefit criterion and fair compensation criterion should be followed．To pay attention to both individuals and mankind should follow justice criterion，equity criterion and cooperation criterion．To have futuregeneration in mind Should follow responsibility criterion，saving criterion，and cautiousness criterion(Wang，2003；Wang，2004a)．The conclusion to be drawn from the above is to give attention to both human race and natural value．to both individual and mankind’s benefit。

浙江大学本科毕业论文外文文献翻译

核准通过，归档资料。

未经允许，请勿外传!浙江大学本科毕业论文外文文献翻译The influence of political connections on the firm value of small and medium-sized enterprises in China政治关联在中国对中小型企业价值的影响1摘要中小型企业的价值受很多因素的影响,比如股东、现金流以及政治关联等.这篇文章调查的正是在中国政治关联对中小型企业价值的影响。

通过实验数据来分析政治关联对企业价值效益的影响.结果表明政府关联是关键的因素并且在中国对中小型企业的价值具有负面影响。

2重要内容翻译2。

1引言在商业界,有越来越多关于政治关联的影响的经济研究。

它们发现政治关联能够帮助企业确保有利的规章条件以及成功获得资源，比如能够最终提高企业价值或是提升绩效的银行贷款，这种政治关联的影响在不同的经济条件下呈现不同的效果。

在高腐败和法律制度薄弱的国家，政治关联对企业价值具有决定性因素1的作用.中国由高度集权的计划经济向市场经济转变，政府对市场具有较强的控制作用，而且有大量的上市企业具有政治关联。

中小型企业发展的很迅速，他们已经在全球经济环境中变得越来越重要。

从90年代起, 政治因素对中国的任何规模的企业来说都变得越来越重要,尤其是中小型企业的价值。

和其他的部门相比较，中小型企业只有较小的现金流，不稳定的现金流且高负债率.一方面，中小型企业改变更加灵活；另一方面,中小型企业在由于企业规模以及对银行来说没有可以抵押的资产，在筹资方面较为困难。

企业如何应对微观经济环境和政策去保证正常的企业活动，并且政治关联如何影响企业价值？这篇论文调查政治关联和企业价值之间的联系,并且试图去研究企业是否可以从政治关联中获利提升企业价值。

2.2定义这些中小型企业之所以叫中小型企业，是和管理规模有关。

对这些小企业来说，雇员很少，营业额较低,资金一般由较少的人提供,因此，通常由这些业主直接管理企业。

3000字外文文献翻译

Human resource management more and more drives value. Under the system that economy development mature, human resource management have to match with fight for the best resources performance, if out of character of the manpower form couples out of character of post, the resources performance be not only whole have no, or may have already exhaust. The modern economy stress balance and match, promote management effect and quality vegetable, will human resource match with make balance, the inside contents establish human resource structure frame, use most in keeping with of the person do most in keeping with of work. Establishment human resource terrace is a communication and collection information way, everyone's opinion comprehensive, give up short take long, with processing salary, welfare etc. affair. Human resource most the importance be a training and development, human resource development have to investment at training aspect, with exertive each stratum of human resource potential.人力资源管理愈来愈被重视。

企业可持续发展战略研究论文中英文外文翻译文献

企业可持续发展战略研究论文中英文外文翻译文献文献1：Sustainable Development Strategies for Businesses该研究论文介绍了企业可持续发展战略的重要性以及相关的实施策略。

可持续发展不仅关注经济利益，还需兼顾社会和环境的利益。

本文提出了几种实施可持续发展战略的方法，包括资源管理、供应链管理和利益相关者合作。

企业应该采取综合性的战略，以确保其经营活动对社会和环境带来积极影响。

文献2：The Role of Corporate Governance in Sustainable Development该文献探讨了公司治理在可持续发展中的作用。

有效的公司治理可以确保企业在经济、社会和环境层面上实现可持续发展目标。

文章讨论了几个与公司治理相关的因素，包括股东权益保护、透明度和问责制。

作者强调了公司治理在促进可持续发展中的重要性，并提出了一些改善公司治理的建议。

文献3：Innovation Strategies for Sustainable Development该研究论文研究了创新战略在可持续发展中的作用。

创新可以推动经济发展，并帮助解决环境和社会问题。

本文提出了几种创新策略，包括技术创新、商业模式创新和社会创新。

作者认为，企业应该将创新作为实现可持续发展的关键策略，并呼吁政府和社会各界提供支持。

文献4：The Importance of Stakeholder Engagement in Sustainable Development该文献强调了利益相关者参与在可持续发展中的重要性。

利益相关者包括员工、股东、政府、社区和其他利益相关的组织。

作者认为，企业应该积极参与利益相关者，并尊重他们的权益和意见。

文章提出了一些有效的利益相关者参与策略，包括沟通、合作和共同决策。

该文献强调了利益相关者参与对企业可持续发展的重要性。

文献5：Measuring and Reporting Sustainability Performance of Businesses该研究论文研究了测量和报告企业可持续发展绩效的方法和指标。

毕业设计论文外文文献翻译

毕业设计(论文）外文文献翻译院系：财务与会计学院年级专业：201＊级财务管理姓名:学号：132148*＊*附件: 财务风险管理【Abstract】Although financial risk has increased significantly in recent years risk and risk management are not contemporary issues。

The result of increasingly global markets is that risk may originate with events thousands of miles away that have nothing to do with the domestic market。

Information is available instantaneously which means that change and subsequent market reactions occur very quickly。

The economic climate and markets can be affected very quickly by changes in exchange rates interest rates and commodity prices。

Counterparties can rapidly become problematic。

As a result it is important to ensure financial risks are identified and managed appropriately. Preparation is a key component of risk management。

【Key Words】Financial risk，Risk management，YieldsI. Financial risks arising1.1What Is Risk1.1.1The concept of riskRisk provides the basis for opportunity. The terms risk and exposure have subtle differences in their meaning. Risk refers to the probability of loss while exposure is the possibility of loss although they are often used interchangeably。

外文文献翻译原文及译文

华北电力大学毕业设计（论文）附件外文文献翻译学号： 200701000324 姓名:杨曦所在院系：电力工程系专业班级：电气化0707指导教师：安勃原文标题： Research on Smart Grid in China2011年06月20日对中国智能电网的研究1摘要——智能电网是电力系统的未来发展的新方向。

在本文中，首先是智能电网的背景，意义，以及概念和结构。

典型的智能电网图如下所示.然后,在美国和欧洲智能电网的发展现状进行了描述，并对这些国家未来发展思路的趋势进行了总结和比较及分析。

此外，分析了中国智能电网发展的必要性，详细介绍了在目前与中国与有关项目，并对特高压电网和智能电网之间的的关系进行了讨论。

最后，对智能电网在未来在中国电网的潜在作用进行了展望和并为中国的智能电网发展指明新方向.索引词,智能电网，特高压电网，规划,经营，管理一导言随着世界经济全球化的推广,石油价格一直维持在一个上升的趋势。

还值得注意的是世界范围内的的能源供应短缺，对资源和环境的压力越来越大,同时，由于目前电网的低效率，在能源输送过程中损失了巨大的电力。

此外,由于不断增长的电力需求和用户对电力可靠性和质量日益增长的要求，电力工业正面临着前所未有的挑战和机遇。

因此，一个有环境友好,经济，高性能，低投资，安全性，可靠性和灵活性特点的的电力系统一直是电力工程师的目标。

尽管如此，基础设施和先进的仪表出现互联网更广泛地的使用加速了这个过程[1］。

自1990年以来随着分布式发电越来越多地使用，已经对对电网的强度提出更多的需求和要求［2][3]。

对于这些问题，为了找出最佳的解决方案，电力公司应接受新的思路，采用新技术，对现有的能源系统进行潜力挖掘，对技术和应用加以改进。

来自不同国家的学者和专家已经达成共识：未来电网的必须能够满足不同的需求及能源发电，高度市场化的电力交易的需求，由此可以满足客户的自我选择。

所有这些都将成为未来智能电网的发展方向。

法学毕业论文文献外文英文翻译

附件一：英文文献INTRODUCTIONOffences of strict liability are those crimes which do not require mens rea with regard to at least one or more elements of the actus reus. The defendant need not have intended or known about that circumstance or consequence. Liability is said to be strict with regard to that element. For a good example see:R v Prince[1875]：The defendant ran off with an under-age girl. He was charged with an offence of taking a girl under the age of 16 out of the possession of her parents contrary to s55 of the Offences Against the Person Act 1861. The defendant knew that the girl was in the custody her father but he believed on reasonable grounds that the girl was aged 18. It was held that knowledge that the girl was under the age of 16 was not required in order to establish the offence. It was sufficient to show that the defendant intended to take the girl out of the possession of her father.It is only in extreme and rare cases where no mens rea is required for liability, thereby making the particular offence "absolute".GENERAL PRINCIPLESThe vast majority of strict liability crimes are statutory offences. However, statutes do not state explicitly that a particular offence is one of strict liability. Where a statute uses terms such as "knowingly" or "recklessly" then the offence being created is one that requires mens rea. Alternatively, it may make it clear that an offence of strict liability is being created. In many cases it will be a matter for the courts to interpret the statute and decide whether mens rea is required or not. What factors are taken into account by the courts when assessing whether or not an offence falls into the category of strict liability offences?THE MODERN CRITERIAIn Gammon (Hong Kong) Ltd v Attorney-General for Hong Kong [1984], the Privy Council considered the scope and role of strict liability offences in the modern criminal law and their effect upon the "presumption of mens rea". Lord Scarman laid down the criteria upon which a court should decide whether or not it is appropriate to impose strict liability: "In their Lordships' opinion, the law … may be stated in the following propositions … : (1) there is a presumption of law that mens rea is required before a person can be held guilty of a criminal offence; (2) the presumption is particularly strong where the offence is "truly criminal" in character; (3) the presumption applies to statutory offences, and can be displaced only if this is clearly or by necessary implication the effect of the statute; (4) the only situation in which the presumption can be displaced is where the statute is concerned with an issue of social concern, and public safety is such an issue; (5) even where a statute is concerned with such an issue, the presumption of mens rea stands unless it can be shown that the creation of strict liability will be effective to promote the objects of the statute by encouraging greater vigilance to prevent the commission of the prohibited act."(1) PRESUMPTION OF MENS REACourts usually begin with the presumption in favor of mens rea, seeing the well-known statement by Wright J in Sherras v De Rutzen：There is a presumption that mens rea, or evil intention, or knowledge of the wrongfulness of the act, is an essential ingredient in every offence; but that presumption is liable to be displaced either by the words of the statute creating the offence or by the subject-matter with which it deals, and both must be considered(2) GRAVITY OF PUNISHMENTAs a general rule, the more serious the criminal offence created by statute, the less likely the courts is to view it as an offence of strict liability. See:Sweet v Parsley [1970]：The defendant was a landlady of a house let to tenants. She retained one room in the house for herself and visited occasionally to collect the rent and letters. While she was absent the police searched the house and found cannabis. The defendant was convicted under s5 of the Dangerous Drugs Act 1965, of "being concerned in the management of premises used for the smoking of cannabis". She appealed alleging that she had no knowledge of the circumstances and indeed could not expect reasonably to have had such knowledge.The House of Lords,quashing her conviction, held that it had to be proved that the defendant had intended the house to be used for drug-taking, since the statute in question created a serious, or "truly criminal" offence, conviction for which would have grave consequences for the defendant. Lord Reid stated that "a stigma still attaches to any person convicted of a truly criminal offence, and the more serious or more disgraceful the offence the greater the stigma". And equally important, "the press in this country are vigilant to expose injustice, and every manifestly unjust conviction made known to the public tends to injure the body politic [people of a nation] by undermining public confidence in the justice of the law and of its administration."Lord Reid went on to point out that in any event it was impractical to impose absolute liability for an offence of this nature, as those who were responsible for letting properties could not possibly be expected to know everything that their tenants were doing.(3) WORDING OF THE STATUTEIn determining whether the presumption in favor of mens rea is to be displaced, the courts are required to have reference to the whole statute in which the offence appears. See:Cundy v Le Cocq (1884) ：The defendant was convicted of unlawfully selling alcohol to an intoxicated person, contrary to s13 of the Licensing Act 1872. On appeal, the defendant contended that he had been unaware of the customer's drunkenness and thus should be acquitted. The Divisional Court interpreted s13 as creating an offence of strict liability since it was itself silent as to mens rea, whereas other offences under the same Act expressly required proof of knowledge on the part of the defendant. It was held that it was not necessary to consider whether the defendant knew, or had means of knowing, or could with ordinary care have detected that the person served was drunk. If he served a drink to a person who was in fact drunk, he was guilty. Stephen J stated: Here, as I have already pointed out, the object of this part of the Act is to prevent the sale of intoxicating liquor to drunken persons, and it is perfectly natural to carry that out by throwing on the publican the responsibility of determining whether the person supplied comes within that category.(4) ISSUES OF SOCIAL CONCERNSee :R v Blake (1996) :Investigation officers heard an unlicensed radio station broadcast and traced it to a flat where the defendant was discovered alone standing in front of the record decks, still playing music and wearing a set of headphones. Though the defendant admitted that he knewhe was using the equipment, he claimed that he believed he was making demonstration tapes and did not know he was transmitting. The defendant was convicted of using wireless telegraphy equipment without a license, contrary to s1 (1) Wireless Telegraphy Act 1949 and appealed on the basis that the offence required mens rea.The Court of Appeal held that the offence was an absolute (actually a strict) liability offence. The Court applied Lord Scarman's principles in Gammon and found that, though the presumption in favor of mens rea was strong because the offence carried a sentence of imprisonment and was, therefore, "truly criminal", yet the offence dealt with issues of serious social concern in the interests of public safety (namely, frequent unlicensed broadcasts on frequencies used by emergency services) and the imposition of strict liability encouraged greater vigilance in setting up careful checks to avoid committing the offence.(5) IS THERE ANY PURPOSE IN IMPOSING STRICT LIABILITY?The courts will be reluctant to construe a statute as imposing strict liability upon a defendant, where there is evidence to suggest that despite his having taken all reasonable steps, he cannot avoid the commission of an offence. See:Sherras v De Rutzen [1895]: The defendant was convicted of selling alcohol to a police officer whilst on duty, contrary to s16(2) of the Licensing Act 1872. He had reasonably believed the constable to be off duty as he had removed his arm-band, which was the acknowledged method of signifying off duty. The Divisional Court held that the conviction should be quashed, despite the absence from s16 (2) of any words requiring proof of mens rea as an element of the offence. Wright J expressed the view that the presumption in favor of mens rea would only be displaced by the wording of the statute itself, or its subject matter. In this case the latter factor was significant, in that no amount of reasonable care by the defendant would have prevented the offence from being committed. Wright J stated: "It is plain that if guilty knowledge is not necessary, no care on the part of the publican could save him from a conviction under section 16, subsection (2), since it would be as easy for the constable to deny that he was on duty when asked, or to produce a forged permission from his superior officer, as to remove his armlet before entering the public house. I am, therefore, of opinion that this conviction ought to be quashed."MODERN EXAMPLESThe following case is a modern example of the imposition of strict liability: Alphacell v Woodward [1972] The defendants were charged with causing polluted matter to enter a river contrary to s2 of the Rivers (Prevention of Pollution) Act 1951. The river had in fact been polluted because a pipe connected to the defendant's factory had been blocked, and the defendants had not been negligent. The House of Lords nevertheless held that the defendants were liable. Lord Salmon stated: If this appeal succeeded and it were held to be the law that no conviction be obtained under the 1951 Act unless the prosecution could discharge the often impossible onus of proving that the pollution was caused intentionally or negligently, a great deal of pollution would go unpunished and undeterred to the relief of many riparian factory owners. As a result, many rivers which are now filthy would become filthier still and many rivers which are now clean would lose their cleanliness. The legislature no doubt recognized that as a matter of public policy this would be most unfortunate. Hence s2(1)(a) which encourages riparian factory owners not only to take reasonable steps to prevent pollution but to do everything possible to ensure that they do not cause it.ARGUMENTS FOR STRICT LIABILITY1. The primary function of the courts is the prevention of forbidden acts. What acts should be regarded as forbidden? Surely only such acts as we can assert ought not to have been done. Some of the judges who upheld the conviction of Prince did so on the ground that men should be deterred from taking girls out of the possession of their parents, whatever the girl's age. This reasoning can hardly be applied to many modern offences of strict liability. We do not wish to deter people from driving cars, being concerned in the management of premises, financing hire purchase transactions or canning peas. These acts, if done with all proper care, are not such acts as the law should seek to prevent.2. Another argument that is frequently advanced in favor of strict liability is that, without it, many guilty people would escape - that there is neither time nor personnel available to litigate the culpability of each particular infraction. T his argument assumes that it is possible to deal with these cases without deciding whether D had mens rea or not, whether he was negligent or not. Certainly D may be convicted without deciding these questions, but how can he be sentenced? Suppose that a butcher sells some meat which is unfit for human consumption. Clearly the court will deal differently with (i) the butcher who knew that the meat was tainted; (ii) the butcher who did not know, but ought to have known; and (iii) the butcher who did not know and had no means of finding out. Sentence can hardly be imposed without deciding into which category the convicted person falls.3. The argument which is probably most frequently advanced by the courts for imposing strict liability is that it is necessary to do so in the interests of the public. Now it may be conceded that in many of the instances where strict liability has been imposed, the public does need protection against negligence and, assuming that the threat of punishment can make the potential harm doer more careful, there may be a valid ground for imposing liability for negligence as well as where there is mens rea. This is a plausible argument in favor of strict liability if there were no middle way between mens rea and strict liability - that is liability for negligence - and the judges have generally proceeded on the basis that there is no such middle way. Liability for negligence has rarely been spelled out of a statute except where, as in driving without due care, it is explicitly required. Lord Devlin has said: "It is not easy to find a way of construing a statute apparently expressed in terms of absolute liability so as to produce the requirement of negligence."ARGUMENTS AGAINST STRICT LIABILITY1. The case against strict liability, then, is, first, that it is unnecessary. It results in the conviction of persons who have behaved impeccably and who should not be required to alter their conduct in any way.2. Secondly, that it is unjust. Even if an absolute discharge can be given D may feel rightly aggrieved at having been formally convicted of an offence for which he bore no responsibility. Moreover, a conviction may have far-reaching consequences outside the courts, so that it is no answer to say that only a nominal penalty is imposed.3. The imposition of liability for negligence would in fact meet the arguments of most of those who favor strict liability. Such statutes are not meant to punish the vicious will but to put pressure upon the thoughtless and inefficient to do their whole duty in the interest of public health or safety or morals." The "thoughtless and inefficient" are, of course, the negligent. The objection tooffences of strict liability is not that these persons are penalized, but that others who are completely innocent are also liable to conviction. Though Lord Devlin was skeptical about the possibility of introducing the criterion of negligence (above), in Reynolds v Austin (1951) he stated that strict liability should only apply when there is something that the defendant can do to promote the observance of the law - which comes close to requiring negligence. If there were something which D could do to prevent the commission of the crime and which he failed to do, he might generally be said to have failed to comply with a duty - perhaps a high duty - of care; and so have been negligent.4. In Alphacell v Woodward (1972) Lord Salmon thought the relevant statutory section, "encourages riparian factory owners not only to take reasonable steps to prevent pollution but to do everything possible to ensure that they do not cause it." This suggests that, however vast the expenditure involved, and however unreasonable it may be in relation to the risk, D is under a duty to take all possible steps. Yet it may be doubted whether factory owners will in fact do more than is reasonable; and it is questionable whether they ought to be required to do so, at the risk - even though it be unlikely - of imprisonment. The contrary argument is that the existence of strict liability does induce organizations to aim at higher and higher standards.POSSIBLE DEVELOPMENTSThere are several possible compromises between mens rea and strict liability in regulatory offences. A "halfway house" has developed in Australia. The effect of Australian cases is: D might be convicted without proof of any mens rea by the Crown; but acquitted if he proved on a balance of probabilities that he lacked mens rea and was not negligent; ie, that he had an honest and reasonable belief in a state of facts which, would have made his act innocent. The onus of proving reasonable mistake is on D.STATUTORY DEFENCESIt is common for the drastic effect of a statute imposing strict liability to be mitigated by the provision of a statutory defense. It is instructive to consider one example. Various offences relating to the treatment and sale of food are enacted by the first twenty sections of the Food Safety Act 1990. Many, if not all, of these are strict liability offences. Section 21(1), however, provides that it shall be a defense for the person charged with any of the offences to prove that he took all reasonable precautions and exercised all due diligence to avoid the commission of the offence by himself or by a person under his control. Statutory defenses usually impose on the defendant a burden of proving that he had no mens rea and that he took all reasonable precautions and exercised all due diligence to avoid the commission of an offence. The effect of such provisions is that the prosecution need do no more than prove that the accused did the prohibited act and it is then for him to establish, if he can, that he did it innocently. Such provisions are a distinct advance on unmitigated strict liability.附件二：英文文献翻译介绍严格责任犯罪是关于客观方面的一个或多个因素不要求犯罪意图的那些犯罪。

3000字外文翻译

3000字外文翻译篇一：3000字英文翻译Bolt Supporting of Large-Span Soft Rockway inShaqu CollieryAbstract The instability of trapezoidal I-steel support is analysed for the compound roof of main coal seam in Shaqu Colliery, and the mechanism of bolt supporting is studied. A scheme of bolt supporting has been given and put into practice,remarkable technical and economic benefits have been got.Key words :large-span,compound roof, bolt supporting, mechanism1.IntroductionIn shaqu colliery a large coal mine mining rare coking coal in China, most roadways are laid out in main coal seamroof of coal seam .The soft compound ,which is composed of mudstone and coal seamcontains aboundant beddings and joints. The strength of the roof is so low that its uniaxial-saturated compressive strength is only 10.7 Mpa.RQD value of coal seam and is zero ,and that of mudstone is lower than 10%. There is clay minerals in mudstone, main compositions are interbedded strata of illite and montmorillonite which will swell when soaked by water, The span of preperation roadways and gateways is wider than 4m, and that of some main roadways is over 5m. In shaqu colliery , preperation roadways and gateways were supported by trapezoidal I-steel support, the beams of which were bent and damaged, and the roadways were destroyed seriously within a short period just after excavated. Roofcontrolling of Large-Span Soft Rockways in the coal seam became the key to the production and construction of shaqu colliery.2.supporting status and instability analysis of trapezoidal I-steel supportstrapezoidal I-steel supports were used in drawing roadways,which roof span is 4.0m, floor span is 4.9m, and hight 2.95m and spacing 0.5m. Initial resistance of the supports was almost zero because it was difficult to the support beams contact the roof, even if with high quality of installation. The trapezoidal I-steel supports would not carry load until the displacement of surrounding rock excceded 80-100 mm because the supports increased very slowly. Therefore, right after excavation, the roof would bend and subside severly. Eight hours after excavation, the roof strata would break completely, and then form rock cavity. The weight of caving rock would act on the beams of supports, which forms loose rock pressure.By calculating, the ultimate load-bearing capacity is smaller than roof pressure whether it is uniformal or concentrated, Based on the in-situ observation, inflection value of most roof reached 200-300mm. When paired supports were used, paired beams were still bent and damaged; then midprops were added, they were also destroyed. Many roof beams were stabilized only if 2-3 props had been added. The supports were damaged completely, and most of them could not be reused. The partsection of roadways had become inverted trapezoid, and the available section was far smaller than the designed section. Part of roadways was out of use because it was in the danger of serious caving.3.Mechanism of bolt supportingIts mechanism is to make full use of the self-load-bearing capacity of surrounding rock by bolting, and then make the surrounding rock stabilize by itself. The stability of surrounding rock depends on the equilibrium status of ground pressure, self-load-bearing capacity of surrounding rock and anchoring force of bolts. Ground pressure is to make surrounding rock deform and break; self-load-bearing capacity is the main factor to stablize surrounding rock. Anchoring force of bolts can notchange the equilibrium status of the three because it is very small, compared with ground pressure and self-load-bearing capacity. And its function is to change the decreasing regularity of self-load-bearing capacity versus the deformation of surrounding rock, and balance self-load-bearing capacity against ground pressure early.Roof pressure is the pressure acting on the roof beams when I-steel supports are used to control the roof. When roof is supported by bolts, the roof pressure change to be the pressure acting on the rock within the bolting range because this part of rock is change into self-bearing body. According to the characteristics of the roof of coal seamscan be divided into six substrata. , bolts strataWhen the value of roof subsidence is zero, roof pressure is in-situ stress; then roof pressure decreases with the increase of roof subsidence. The variation of roof pressure is analyzed by FLAC, The results are shown as curve 1 in Fig.1. Wheoof subsidence reaches 19 mm, the first roof substratum begins to bearing tensile stress, then losts self-load-bearing capacity, and roof pressure decreases to 0.67Mpa. When roof subsidence reaches 40 mm, the second substratum loses self-load-bearing capacity, and roof pressure decreases to 0.16Mpa. When roof subsidence reaches 100 mm, the fourth substratum loses self-load-bearing capacity, and roof pressure decreases to0.08Mpa. In the initial stage of roof subsidence, roof pressure decreases rapidly, and in the later stage of roof subsidence, roof pressure decreases slowly and then has an increasing trend.The self-load-bearing capacity of the roof without bolting is calculated upon the theory of laminated beam, the result are shown as curve 2 in Fig.1. When roof subsidence is zero, the self-load-bearing capacity is at its utmost value 0.0625Mpa; when roof subsidence is 100mm,roof strata have broken, most of self-load-bearing capacity has lost, and the residual self-load-bearing capacity is only 0.0375Mpa.Theself-load-bearing capacity of the roof with bolting is calculated upon the theory of combined beam, the result are shown as curve 3 in Fig.1. When roof subsidence is zero, the self-load-bearing capacity is at its utmostvalue 0.4Mpa; when the roof subsidence reaches 40mm the self-load-bearing capacity decreases to 0.225Mpa,and when roof subsidence reaches 100mm, the self-load-bearing capacity decreases to 0.1Mpa .As shown in Fin. 1, the self-load-bearing capacity of roof strata without bolting is lower than roof pressure during the whole course of roof subsiding, so roof strata cave inevitably. When bolted, roof strata is changed from laminated beam into combined beam ,and the selr-load-bearing capacity increases markedly. When roof subsidence reaches 44mm, the self-load-bearing capacity exceeds roof pressure, then roof strata stabilized by itself.4 Anchoring technologyBased on the above study of bolting mechanism, large setting resistance, high speed of resistance and high final resistance are the key technology to the large-spon soft rock roadway before roof strata detaching, which includes: (1)to improve the setting resistance increasing and achieve high speed of resistance increasing, to make the real working properties of bolts coordinate self-load-bearing properties of roof strata , which enables to make full use of the self-load-bearing capacity of roof strata; (2)to raise bolting reliability, and solve the difficult problems that anchoring force between bolts and soft rock is small and easy to lose.4.1 Bloting scheme篇二：本科论文 3000字外文翻译附录A3 Image Enhancement in the Spatial DomainThe principal objective of enhancement is to process an image so that the result is more suitable than the original image for a specific application. The word specific is important, because it establishes at the outset than the techniques discussed in this chapter are very much problem oriented. Thus, for example, a method that is quite useful for enhancing X-ray images may not necessarily be the best approach for enhancing pictures of Mars transmitted by a space probe. Regardless of the method used .However, image enhancement is one of the most interesting and visually appealing areas of image processing.Image enhancement approaches fall into two broad categories: spatial domain methods and frequency domain methods. The term spatial domain refers to the image plane itself, and approaches in this category are based on direct manipulation of pixels in an image. Fourier transform of an image. Spatial methods are covered in this chapter, and frequency domain enhancement is discussed in Chapter 4.Enhancement techniques based on various combinations of methods from these two categories are not unusual. We note also that many of the fundamental techniques introduced in this chapter in the context of enhancement are used in subsequent chapters for a variety of other image processing applications.There is no general theory of image enhancement. When an image is processed for visual interpretation, the viewer is the ultimate judge of how well a particular method works. Visual evaluation of image quality is a highly is highly subjective process, thus making the definition of a “good image” an elusive standard by which to compare algorithm performance. When the problem is one of processing images for machine perception, the evaluation task is somewhat easier. For example, in dealing with a character recognition application, and leaving aside other issues such as computational requirements, the best image processingmethod would be the one yielding the best machine recognition results. However, even in situations when aclear-cut criterion of performance can be imposed on the problem, a certain amount of trial and error usually is required before a particular image enhancement approach is selected.3.1 BackgroundAs indicated previously, the term spatial domain refers to the aggregate of pixels composing an image. Spatial domain methods are procedures that operate directly on these pixels. Spatial domain processes will be denotes by the expressiong?x,y??T?f(x,y)? (3.1-1)where f(x, y) is the input image, g(x, y) is the processed image, and T is an operator on f, defined over some neighborhood of (x, y). In addition, T can operate on a set of input images, such as performing the pixel-by-pixel sum of K images for noise reduction, as discussed in Section 3.4.2.The principal approach in defining a neighborhood about a point (x, y) is to use a square or rectangular subimage area centered at (x, y).The center of the subimage is moved from pixel to starting, say, at the top left corner. The operator T is applied at each location (x, y) to yield the output, g, at that location. The process utilizes only the pixels in the area of the image spanned by the neighborhood. Although other neighborhood shapes, such as approximations to a circle, sometimes are used, square and rectangular arrays are by far the most predominant because of their ease of implementation.The simplest from of T is when the neighborhood is of size 1×1 (that is, a single pixel). In this case, g depends only on the value of f at (x, y), and T becomes a gray-level (also called an intensity or mapping) transformation function of the forms?T(r) (3.1-2)where, for simplicity in notation, r and s are variables denoting, respectively, the grey level of f(x, y) and g(x, y)at any point (x, y).Some fairly simple, yet powerful, processing approaches can be formulates with gray-level transformations. Because enhancement at any point in an image depends only on the grey level at that point, techniques in this category often are referred to as point processing.Larger neighborhoods allow considerably more flexibility. The general approach is to use a function of the values of f in a predefined neighborhood of (x, y) to determine the value of g at (x, y). One of the principal approaches in this formulation is based on the use of so-called masks (also referred to as filters, kernels, templates, or windows). Basically, a mask is a small (say, 3×3) 2-Darray, in which the values of the mask coefficients determine the nature of the type of approach often are referred to as mask processing or filtering. These concepts are discussed in Section 3.5.3.2 Some Basic Gray Level TransformationsWe begin the study of image enhancement techniques by discussing gray-level transformation functions. These are among the simplest of all image enhancement techniques. The values of pixels, before and after processing, will be denoted by r and s, respectively. As indicated in the previous section, these values are related by an expression of the from s = T(r), where T is a transformation that maps a pixel value r into a pixel value s. Since we are dealing with digital quantities, values of the transformation function typically are stored in a one-dimensional array and the mappings from r to s are implemented via table lookups. For an 8-bit environment, a lookup table containing the values of T will have 256 entries.As an introduction to gray-level transformations, which shows threebasic types of functions used frequently for image enhancement: linear (negative and identity transformations), logarithmic (log and inverse-log transformations), and power-law (nth power and nth root transformations). The identity function is the trivial case in which out put intensities are identical to input intensities. It is included in the graph only for completeness.3.2.1 Image NegativesThe negative of an image with gray levels in the range [0, L-1]is obtained by using the negative transformation show shown, which is given by the expressions?L?1?r(3.2-1)Reversing the intensity levels of an image in this manner produces the equivalent of a photographic negative. This type of processing is particularly suited for enhancing white or grey detail embedded in dark regions of an image, especiallywhen the black areas are dominant in size.3.2.2 Log TransformationsThe general from of the log transformation iss?clog(1?r) (3.2-2)Where c is a constant, and it is ass umed that r ≥0 .The shape of the log curve transformation maps a narrow range of low gray-level values in the input image into a wider range of output levels. The opposite is true of higher values of input levels. We would use a transformation of this type to expand the values of dark pixels in an image while compressing the higher-level values. The opposite is true of the inverse log transformation.Any curve having the general shape of the log functions would accomplish this spreading/compressing of gray levels in an image. In fact, the power-law transformations discussed in the next section are much moreversatile for this purpose than the log transformation. However, the log function has the important characteristic that it compresses the dynamic range of image characteristics of spectra. It is not unusual to encounter spectrum values that range from 0 to 106 or higher. While processing numbers such as these presents no problems for a computer, image display systems generally will not be able to reproduce faithfully such a wide range of intensity values .The net effect is that a significant degree of detail will be lost in the display of a typical Fourier spectrum.3.2.3 Power-Law TransformationsPower-Law transformations have the basic froms?cr? (3.2-3)Where c and y are positive constants .Sometimes Eq. (3.2-3) is written asto account for an offset (that is, a measurable output when the input is zero). However, offsets typically are an issue of display calibration and as a result they are normally ignored in Eq. (3.2-3). Plots of s versus r for various values of y are shown in Fig.3.6. As in the case of the log transformation, power-law curves with fractional values of y map a narrow range of dark input values into a wider range of output values, with the opposite being true for higher values of input levels. Unlike the log function, however, we notice here a family of possible transformation curves obtained simply by varying y. As expected, we see in Fig.3.6 that curves generated with values of y＞1 have exactly the opposite effect as those generated with values of y＜1. Finally, we note that Eq.(3.2-3) reduces to the identity transformation when c = y = 1.A variety of devices used for image capture, printing, and display respond according to as gamma[hence our use of this symbol in Eq.(3.2-3)].The process used to correct this power-law response phenomena is called gamma correction.Gamma correction is important if displaying an image accurately ona computer screen is of concern. Images that are not corrected properly can look either bleached out, or, what is more likely, too dark. Trying to reproduce colors accurately also requires some knowledge of gamma correction because varying the value of gamma correcting changes not only the brightness, but also the ratios of red to green to blue. Gamma correction has become increasingly important in the past few years, as use of digital images for commercial purposes over the Internet has increased. It is not Internet has increased. It is not unusual that images created for a popular Web site will be viewed by millions of people, the majority of whom will have different monitors and/or monitor settings. Some computer systems even have partial gamma correction built in. Also, current image standards do not contain the value of gamma with which an image was created, thus complicating the issue further. Given these constraints, a reasonable approach when storing images in a Web site is to preprocess the images with a gamma that represents in a Web site is to preprocess the images with a gamma that represents an “average” of the types of monitors and computer systems that one expects in the open market at any given point in time.3.2.4 Piecewise-Linear Transformation FunctionsA complementary approach to the methods discussed in the previous three sections is to use piecewise linear functions. The principal advantage of piecewise linear functions over the types of functions we have discussed thus far is that the form of piecewise functions can be arbitrarily complex. In fact, as we will see shortly, a practical implementation of some important transformations can be formulated only 篇三：3000字外文文献翻译模板学年论文（外文文献翻译）英文题目 Financial structure and development 译文题目金融结构与金融发展姓名学号所在学院管理学院专业班级指导教师日期 20xx 年 6 月 28 日目录文献名：作者：文献来源：原文 (1)译文 (10)原文：（可以保留文献的原有格式）译文：（需要有页眉为：20xx级会计专业学年论文）11。

外文翻译格式及规范

嘉兴学院毕业论文（设计）外文翻译撰写格式规范一、外文翻译形式要求1、要求本科生毕业论文（设计）外文翻译部分的外文字符不少于1.5万字, 每篇外文文献翻译的中文字数要求达到2000字以上，一般以2000~3000字左右为宜。

2、翻译的外文文献应主要选自学术期刊、学术会议的文章、有关著作及其他相关材料，应与毕业论文（设计）主题相关，并作为外文参考文献列入毕业论文（设计）的参考文献。

3、外文翻译应包括外文文献原文和译文，译文要符合外文格式规范和翻译习惯。

二、打印格式嘉兴学院毕业论文（设计）外文翻译打印纸张统一用A4复印纸，页面设置：上：2.8；下：2.6；左：3.0；右：2.6；页眉：1.5；页脚：1.75。

段落格式为：1.5倍行距，段前、段后均为0磅。

页脚设置为：插入页码，居中。

具体格式见下页温馨提示：正式提交“嘉兴学院毕业论文（设计）外文翻译”时请删除本文本中说明性的文字部分（红字部分）。

嘉兴学院本科毕业论文（设计）外文翻译题目：（指毕业论文题目）学院名称：服装与艺术设计学院专业班级：楷体小四学生姓名：楷体小四一、外文原文见附件（文件名：12位学号+学生姓名+3外文原文．文件扩展名）。

二、翻译文章翻译文章题目（黑体小三号，1.5倍行距，居中）作者（用原文，不需翻译，Times New Roman五号，加粗，1.5倍行距，居中）工作单位（用原文，不需翻译，Times New Roman五号，1.5倍行距，居中）摘要：由于消费者的需求和汽车市场竞争力的提高，汽车检测标准越来越高。

现在车辆生产必须长于之前的时间并允许更高的价格进行连续转售……。

(内容采用宋体五号，1.5倍行距)关键词：汽车产业纺织品，测试，控制，标准，材料的耐用性1 导言（一级标题，黑体五号，1.5倍行距，顶格）缩进两个字符，文本主体内容采用宋体（五号），1.5倍行距参考文献（一级标题，黑体五号， 1.5倍行距，顶格）略（参考文献不需翻译，可省略）资料来源：AUTEX Research Journal, V ol. 5, No3, September 2008*****译****校（另起一页）三、指导教师评语***同学是否能按时完成外文翻译工作。

急求经济类3000字左右英文文献(带翻译更好

急求经济类3000字左右英文文献(带翻译更好篇一：一篇经济类英文论文(含中文翻译)The Problem of Social Cost社会成本问题RONALD COASE罗纳德·科斯Ronald Coase is Professor Emeritus at University of Chicago LawSchool and a Nobel Laureate in Economics. This article is fromThe Journal of Law and Economics (October 1960). Several passages devoted to extended discussions of legal decisionshave been omitted.罗纳德·科斯在芝加哥大学法学院名誉教授和诺贝尔经济学奖得主。

本文是其外法学与经济学杂志（1960年10月）。

专门的法律问题的决定的延伸讨论的几个段落已被省略。

I. THE PROBLEM TO BE EXAMINEDThis paper is concerned with those actions of business firms which have harm-ful effects on others. The standard example is that of a factory the smoke from which has harmful effects on those occupying neighbouring properties. The economic analysis of such a situation has usually proceeded in terms of a divergence between the private and social product of the factory, in which economists have largely followed the treatment of Pigou in The Economies of Welfare. The conclusion to which this kind of analysis seems to have led most economists is that it would be desirable to make the owner of the factory li-able for the damage caused to those injured by the smoke, or alternatively, to place a tax on the factory owner varying with the amount of smoke produced and equivalent in money terms to the damage it would cause, or finally, to exclude the factory from residential districts (and presumably from other areas in which theemission of smoke would have harmful effects on others). It is my contention that the suggested courses of action are inappropriate, in that they lead to results which are not necessarily, or even usually, desirable.一、要检查的问题本文关注的是这些行动的企业有伤害他人有用的影响。

船舶与海洋工程论文中英文资料外文翻译文献

中英文资料外文翻译文献A Simple Prediction Formula of Roll Damping of Conventional Cargo Ships on the Basis of lkeda's Method and Its LimitationSince the roll damping of ships has significant effects of viscosity, it is difficult to calculate it theoretically. Therefore, experimental results or some prediction methods are used to get the roll damping in design stage of ships. Among some prediction methods, Ikeda’s one is widely used in many ship motion computer programs. Using the method, the roll damping of various ship hulls with various bilge keels can be calculated to investigate its characteristics. To calculate the roil damping of each ship, detailed data of the ship are needed to input. Therefore, a simpler prediction method is expected in primary design stage. Such a simple method must be useful to validate the results obtained by a computer code to predict it on the basis of Ikeda，s method, too. On the basis of the predicted roll damping by Ikeda’s method for various ships, a very simple prediction formula of the roll damping of ships is deduced in the present paper. Ship hull forms are systematically changed by changing length, beam, draft, mid-ship sectional coefficient and prismatic coefficient. It is found, however, that this simple formula can not be used for ships that have high position of the center of gravity. A modified method to improve accuracy for such ships is proposed.Key words: Roll damping, simple prediction formula, wave component, eddy component, bilge keel component.IntroductionIn 1970s, strip methods for predicting ship motions in 5-degree of freedoms in waves have been established. The methods are based on potential flow theories (Ursell-Tasai method, source distribution method and so on), and can predict pitch, heave, sway and yaw motions of ships in waves in fairly good accuracy. In roll motion, however, the strip methods do not work well because of significant viscous effects on the roll damping. Therefore, some empirical formulas or experimental dataare used to predict the roll damping in the strip methods.To improve the prediction of roll motions by these strip methods, one of the authors carried out a research project to develop a roll damping prediction method which has the same concept and the same order of accuracy as the strip methods which are based on hydrodynamic forces acting on strips. The review of the prediction method was made by Himeno [5] and Ikeda [6，7] with the computer program.The prediction method, which is now called Ikeda’s method, divides the roll damping into the frictional (BF), the wave (Bw)，the eddy (Be) and the bilge keel (Bbk) components at zero forward speed, and at forward speed, the lift (Bi) is added. Increases of wave and friction components due to advance speed are also corrected on the basis of experimental results. Then the roll damping coefficient B44 (= roll damping moment (kgfm)/roll angular velocity (rad/sec)) can be expressed as follows: B44 B bk (1)At zero forward speed, each component except the friction and lift components are predicted for each cross section with unit length and the predicted values are summed up along the ship length. The friction component is predicted by Kato’s formula for a three-dimensional ship shape. Modification functions for predicting the forward speed effects on the roll damping components are developed for the friction, wave and eddy components. The computer program of the method was published, and the method has been widely used.For these 30 years, the original Ikeda’s method developed for conven tional cargo ships has been improved to apply many kinds of ships, for examples, more slender and round ships, fishing boats, barges, ships with skegs and so on. The original method is also widely used. However, sometimes, different conclusions of roll mot ions were derived even though the same Ikeda’s method was used in the calculations. Then, to check the accuracy of the computer programs of the same Ikeda’s method, a more simple prediction method with the almost same accuracy as the Ikeda’s original one h as been expected to be developed. It is said that in design stages of ships, Ikeda’s method is too complicated to use. To meet these needs, a simple roll damping prediction method was deduced by using regression analysis [8].Previous Prediction FormulaThe simple prediction formula proposed in previous paper can not be used for modem ships that have high position of center of gravity or long natural roll period such as large passenger ships with relatively flat hull shape. In order to investigate its limitation, the authors compared the result of this prediction method with original Ikeda’s one while out of its calculating limitation. Fig. 1 shows the result of the comparison with their method of roll damping. The upper one is on the condition that the center of gravity is low and the lower one on the condition that the center of gravity is high.From this figure, the roll damping estimated by this prediction formula is in good agreement with the roll damping calculated by the Ikeda’s method for low positi on of center of gravity, but the error margin grows for the high position of center of gravity. The results suggest that the previous prediction formula is necessary to be revised. Methodical Series ShipsModified prediction formula will be developed on the basis of the predicted results by Ikeda’s method using the methodical series ships. This series ships are constructed based on the Taylor Standard Series and its hull shapes are methodically changed by changing length, beam, draft, midship sectional coefficient and longitudinal prismatic coefficient. The geometries of the series ships are given by the following equations. Proposal of New Prediction Method of Roll DampingIn this chapter, the characteristics of each component of the roll damping, the frictional, the wave, the eddy and the bilge keel components at zero advanced speed, are discussed, and a simple prediction formula of each component is developed.As well known, the wave component of the roll damping for a two-dimensional cross section can be calculated by potential flow theories in fairly good accuracy. In Ikeda's method, the wave damping of a strip section is not calculated and the calculated values by any potential flow theories are used as the wave damping.reason why viscous effects are significant in only roll damping can be explained as follows. Fig. 4 shows the wave component of the roll damping for 2-D sections calculated by a potential flow theory.ConclusionsA simple prediction method of the roll damping of ships is developed on the basis of the Ikeda’s original prediction method which was developed in the same concept as a strip method for calculating ship motions in waves. Using the data of a ship, B/d, Cb，Cm, OG/d, G)，bBK/B, Ibk/Lpp，(pa, the roll damping of a ship can be approx imately predicted. Moreover, the limit of application of Ikeda’s prediction method to modern ships that have buttock flow stern is demonstrated by the model experiment. The computer program of the method can be downloaded from the Home Page of Ikeda’s Labo (AcknowledgmentsThis work was supported by the Grant-in Aid for Scientific Research of the Japan Society for Promotion of Science (No. 18360415).The authors wish to express sincere appreciation to Prof. N. Umeda of Osaka University for valuable suggestions to this study.References五、Y. Ikeda, Y. Himeno, N. Tanaka, On roll damping force of shipEffects of friction of hull and normal force of bilge keels, Journal of the Kansai Society of Naval Architects 161 (1976) 41-49. (in Japanese)六、Y. Ikeda, K. Komatsu, Y. Himeno, N. Tanaka, On roll damping force of ship~Effects of hull surface pressure created by bilge keels, Journal of the Kansai Society of Naval Architects 165 (1977) 31-40. (in Japanese)七、Y. Ikeda, Y. Himeno, N. Tanaka, On eddy making component of roll damping force on naked hull, Journal of the Society of Naval Architects 142 (1977) 59-69. (in Japanese)八、Y. Ikeda, Y. Himeno, N. Tanaka, Components of roll damping of ship at forward speed, Journal of the Society of Naval Architects 143 (1978) 121-133. (in Japanese) 九、Y. Himeno, Prediction of Ship Roll Damping一State of the Art, Report of Department of Naval Architecture & Marine Engineering, University of Michigan, No.239, 1981.十、Y. Ikeda, Prediction Method of Roll Damping, Report of Department of Naval Architecture, University of Osaka Prefecture, 1982.十一、Y. Ikeda, Roll damping, in: Proceedings of 1stSymposium of Marine Dynamics Research Group, Japan, 1984, pp. 241-250. (in Japanese)十二、Y. Kawahara, Characteristics of roll damping of various ship types and as imple prediction formula of roll damping on the basis of Ikeda’s method, in: Proceedings of the 4th Asia-Pacific Workshop on Marine Hydrodymics, Taipei, China, 2008，pp. 79-86.十三、Y. Ikeda, T. Fujiwara, Y. Himeno, N. Tanaka, Velocity field around ship hull in roll motion, Journal of the Kansai Society of Naval Architects 171 (1978) 33-45. (in Japanese)十四、N. Tanaka, Y. Himeno, Y. Ikeda, K. Isomura,Experimental study on bilge keel effect for shallow draftship, Journal of the Kansai Society of Naval Architects 180 (1981) 69-75. (in Japanese)常规货船的横摇阻尼在池田方法基础上的一个简单预测方法及其局限性摘要：由于船的横摇阻尼对其粘度有显着的影响，所以很难在理论上计算。

3000单词外文文献翻译范文

南京航空航天大学金城学院毕业设计（论文）外文文献翻译系部经济系专业国际经济与贸易学生姓名学号指导教师曹冬艳职称讲师2014年 4 月Research on the Agricultural Products Export in Shandong Provinceunder Green Trade BarriersChapter One Introduction1.1 Research Background and significance of the PaperGreen trade barriers closely related to green trade protection, which provides the trade protector a new concept and had a huge impact on international trade. Although green trade barriers blocked the international trade to some extent, it actually aims to protect environment and human health. Green trade is a trend in the international trade and an irreversible one in the world market.1.1.1 Research BackgroundAs the world’s largest developing country, agriculture industry is the traditional industry in China and agricultural products have been the traditional ones for trade. And green trade barrier will have a far-reaching influence on China’s agricultural products export. Since China’s accession to the WTO in2001, China’s agricultural products export enterprises have been restricted not only by tariffs, quotas and other restrictions, but also suffer from the so-called “green requirements”, which led to difficulty in access to the world market. Under the WTO framework, more and more countries have adopted subtler, less transparent measures on their agricultural production and trade under green trade barriers, which makes it harder to monitor and predict. So China’s agricultural trade and overall economic development will face new challenges, thus how to cope with green trade barriers has become key issues for us.1.1.2 Significance of the PaperAgriculture in China has a long history. Early center of Agriculture has been identified in the Huang he (Yellow River) in China. Rice, millet, soybean, onion, and peach are among of the most important products originated in this region.China has been a nation of farmers for over 4,000 years. When the People’s Republic of China was established in 1949, all arable land was under cultivation; agricultural infrastructure as irrigation and drainage systems constructed centuries earlier and intensive farming practices already produced relatively high yields (Library of Congress). Currently, even China’s cropland is only about 75 percent of the US(8). The main crops cultivated are rice, wheat, maize, cotton, soybeans and tobacco. Agricultural of China is important due to the size of population and economic development.Since most of Chinese population is considered rural, agricultural activities is one of the main sources of employment in the country. Concerns about food security make the government put strong emphasis in production. In general terms, it must satisfy 21 percent of world’s population food needs with just 9 percent of world arable land.Chapter two2.1 Situation of Agricultural Products ExportReform and trade liberalization in China’s external sector has proceeded progressively during last 20 years. Though this reform period, China’s trade regime has gradually changed form a highly centralized, planned and import substitution regime to a more decentralized, market-oriented and exports promotion one. These changes in trade and other policies have significantly affected the total and composition of China’s trade in favor of the products in which China has a comparative advantage. China tends to exports labor-intensive products such fruits,vegetables,fish and processed agricultural goods, which has been destined mainly to neighboring countries,especially Japan, Korea and others countries of Southeast Asia and also the USA and Europe.Exports of agricultural products are an important source of foreign currency in China, however ,even the value of agricultural products exportation continue growing, its share as part of the total export value has diminished gradually over the years, from a share of 20% in 1998 to 6.3% in 2000(21). China continues being a major world player in exports of agricultural products. In 2001, export of garlic and mushrooms were above 40 percent of world exports, while export of silk reached a share of 81 percent (measured in value).China exports a lot of vegetables, however not all in same big quantities. Garlic has been the main exported in this category with a quantity of 54.65 thousand Mt in 2001, and an average of 233 thousand Mt over the part 11 year period. Canned mushrooms and Dry onions reached averages of 171 and 103 thousand Mt each one during the same period. Other vegetables, also very important, that had big average exported quantities (in thousand Mt) are : cabbages (53.5), carrots (35.9), mushroom (35.5), watermelons (28.5), dried mushrooms (24.8), cauliflower (18.3), tomatoes (18.1), leeks (13.6), and green broad beans (11.6).In the group of meat (23), chicken meat and pork has been the most important with an average export of 237.2 and 190.2 thousand Mt per year. Other types of meat that represent relative largeaverage quantities (thousand of Mt) per year are: meat preparation pigs (70) canned chicken meat (42.5), pig meat (35.3), beef and veal boneless (32.7), rabbit meat (21.7), and duck meat (15.8).In the cereal group, maize has been the most important product with an average exported quantity that surpassed 6.3 million Mt per year between 1991 to2001, and represented 73.1.% of average exported cereals. Rice has been also important, ever its quantity is not so large as maize, but it reached an average export of 1,6 million Mt each year, and a share of 19% of total cereals exports:both maize and rice together represented 92.1% of cereal exports. Other cereals less important in quantity are sorghum and buckwheat, and finally with even less quantity are wheat, triticale and millet.Export of fibres were represented principally by cotton lint, which had an average of 115 thousand Mt per year, that is 55.9% of total fibres exports measured in quantity, but only 18.1% measured in value. Other products such cotton waste, scoured wool, raw and waste silk, and jute met average imported quantities of 16.6, 11.7, 10.9, and 9,7 thousand Mt respectively. With less quantity are other products like carded or comber hair, tow and waste of flax, ramie, unreliable cocoons and greasy wool. From the point of view of value, export were led by raw and waste silk, and carded or comber hair, with a participation of 30.9 and 26.8% respectively.Spices exports were dominated by ginger, which in 2001 reach a record quantity of 177 thousand Mt Exports of pimento reached 84.8 thousand Mt in 2001 and an average of 50.6 thousand Mt per year while cinnamon surpassed slightly an average of 23.3 thousand Mt per year. Other products are anise peppers. In the stimulant group, even China exports green coffee and cocoa powder, quantities are relative small to compare with export of tea, which accounted average of 201.3 thousand Mt in the 11 years period. In the other crops group, cigarettes and tobacco leaves has lead the list with an average export quantity of 40.3 and 15.5 thousand Mt tons per years respectively. Other products are natural rubber-232, hops, and oil of citronella.2.2 General Situation and The Trade of Export to Main Countries or Regions2.2.1 General Situation of Export to Main Countries or RegionsAccording to the China’s Agricultural Yearbook of 1994, Chinese agricultural exports have reached more than 160 different countries and region region. Chinese agricultural exports are distributed all over the continents; however this distribution is not balanced. The average exports from 1994 to2000 show that the Asian region was the main destination, concentrating 75.5% of total agricultural exports. The other regions have participated with different percentages: Europe 15.2%, North America 5.4%, Africa 2.3%, Latin America 1% and Oceania 0.6%.In the Asia region, exports are also concentrated in three destinies: Japan (30.9%), Hong Kong (18.2%) and South Korea (6.7%); these three destinies together have signified an average percentage of 55.8% per year. Other countries in this region with an important participation are: Singapore (2.8%), Indonesia (2.6%), Malaysia (2.5%) and Philippines with 2.1%.In Europe, the main buying countries have been Russia, Holland and Germany, each one with participation of 2.9, 2.7 and 3.1%.In North America, exports have gone to the United States (4.7%) and Canada (0.6%). In Africa the main destinies are Cote d’Ivoire (0.3%), Morocco (0.3%) and South Africa (0.3%). In Latin America Cuba (0.3%) and Brazil (0.2 %), and finally in Oceania is Australia (0.5%).China has had an important participation in several agricultural exports. Products with high share of world exports were ramie and raw and waste silk, with 91.9% and 87.7% in 2001. Both of these two products show increase in share between 1991 and 2001. When shares changed from 58.3% to 91.9% and from 72% to 87.7%, respectively.2.2.2 The Trade of Export and importIn 1991, there were only 6 products its export share was above 50% of world exports: sweet potatoes, pork, raw and waste silk, ramie, unreelable cocoons and cake of cotton seed. In 2001 the number of products increased to 10 products; the new added products were buckwheat, oil of tung, hair (carded or combed), reelable cocoons, fresh or dried vegetables and ginger. At the same time some products decreased participation under 50%, as in the case of sweet potatoes, pork and cake of cottonseed.Other products that had participation between 30% and 50% in 2001 were: cassava tapioca, mushrooms (dried and canned), hair of horses, garlic, groundnuts (prepared, shelled, and in shell), and oil of citronella.In the group of products with share between 20% and 30% were: rabbit (meat and skins), wool shoddy, chestnuts, beeswax, canella, oil of sesame seeds, soya sauce, honey and dry beans. The rest of product had a share below 20%.Total agricultural exports show an increasing tendency, according to data from Faostat, it increase in11.7% between 1991 and 2001.Exports of cereals have not had a defined tendency. In some years and in others drop. From the point of view of the quantity, China was a net exporter of some cereals such rice, maize, buckwheat, sorghum, triticale and millet. However in some years like 1995 and 1996 Chinas was a net importer of rice and maize, and again 1998 and 1999 for the case of maize. Sorghum exports only were higher than imports until 1997.In the meat products group, it was clear a decrease in pork and pig meat exports since 1995 and 1996 respectively, and a continuous increase in chicken meat exports. China was a net exporter Pork (until 1998), pigmeat, rabbit meat and goose meat principally. It is appreciably that canned chicken is the new tendency in export of meat; it already surpassed export of pork since 1999. Fruits and vegetables exports have had the best performance. Fruits show a continuous increasing tendency, especially pushed by increasing exports of apples juice during last years. Exports of main vegetables (garlic, onion, mushroom and tomato paste) increased year by year, and for 2001, the exported quantities of all vegetables were more than 300% of that one of 1991. In the vegetables group China was a net exporter except in few cases. In the case of fruits China was a net exporter of main fruit as apples (except for 1991-2-4-5), pears, canned pineapple, tangerines (with clementines), plums, mangoes and apple juice (single streng) principally. In the sum of total main fruit China was a net exporter between 1991 and 1995, and in 2001.Textile fibres exports shows a declining tendency, even the export of cotton lint attempted to recover during 1999 and 2000, but for 2001 it declined again. The other main exported products in this group except for jute (decline) show a stable tend. In silk (raw and waste), ramie and hair of horses China was a net exporter during all years of the period.Vegetable oil export statistics suggest that large exported quantities (1994 to 1997) of this category were not sustained in the time. All exported quantities were under 200 thousand Mt, with exception for oil of soya beans in 1997 and for oil of palm in 1994-5. China was a net exporter of some kinder of oils such: oil of tung, oil of groundnuts, oil of sesame seed, oil of cotton seed and oil of safflower.In pulses, instability was also present, caused mainly by changes in dry beans exports. Exports were higher than export for the whole pulses value (quantity), and for dry beans, dry broad beans and lentils.Exports of nuts, except for the walnuts presented a stable tendency; the same situation was experimented by export of tea and livestock, although in livestock, pig and cattle export tendencies are a little inclined towards decreasing. China was a net exporter of nuts, especially chestnuts and walnuts; in stimulants products not only of tea, also of cocoa butter and coffee extracts; and in livestock most of animals export for horses and goats.Some exports show clear decreasing tendency, for example, export of sweet potatoes and dried cassava almost disappeared; quantities exported in 2001 represented only 1.63% and 0.0024% respectively compared with quantities exported in 1991. However taro and potatoes maintained its export levels. Oil-bearing crops also were in the declining tendency group, it was pressured by diminish of soybean oil exports, which did’t recover high exported levels reached in 1991 and 1994. Fodder crops followed decreasing tendency for most of the years and the quantity exported in 2001 was 69.6% lower than the reached one in 1991. In oil-bearing crops China was a net exporter of groundnuts, sesame seeds, castor beans, sunflower seeds, cottonseeds and safflower seeds principally; In fodder products China was net exporter of dry beet pulp and some types of cakes like cotton seed, rapeseed, sunflower seed, linseed, maize and groundnuts, (in the case of soya bean cakes was a net exporter until 1995 and in 2001).Chapter Three3.1The Influence of Agricultural Products Export in Shandong Province under Green Trade BarriersThe research on main countries Shandong agricultural products export to under greed trade barrier. In the first part, it presents the general situation of Shandong Province’s agricultural products export to main countries and regions. Japan, U.S. And the EU are the major trading partners of Shandong Province. It is no doubt that green trade barriers enhances awareness of environment protection,human being’s health, and animals and plants safety. Nonetheless, green trade barriers will also impose negative influence on trade. Many of the developed countries, with their solid financial strength and technological advancement, are moving ahead with respect to the environment standards and technical guidance. They have prepared a series of technical standards which can affect the development countries seriously. Obviously, the environment standards and technical standards set by the development countries are much higher than other countries, which isharder for the exporting countries to meet. Furthermore, the higher standards can result in extra costs,which make it even difficult for exporters to do business in the World. Japan has taken restrictive measures mainly on China’s products such as vegetable, shellfish and other products. On May 29th,2006, “Positive List System ” was formally put into effect in japan. Under this system, maximum residue limits were established for all agricultural chemicals residues, covering 302 kind of food, 799 kinds of agricultural chemicals, and 54,782 limited standards, which comprehensively increase the technological threshold of agricultural products import for entering the market.”Positive List System”, with checks staring overseas is a new comprehensive safety and sanitation monitoring program. The EU has come up with more requirements for the food exporters, which means export of agricultural products to the EU, should not only reach the EU food safety standards, but also attach importance to food safety management, and U.S. Has set higher requirements in food safety and hygiene of imported products. In the following parts, characteristics of technical regulations and standard were analyzed under green trade barriers of Japan, the EU and U.S. Then analysis of negative influence on relevant agricultural products exported data and information and corresponding countermeasures were made to deal with the negative effect of green trade barriers.3.2 The Suggestions to Green Trade BarriersBased on the above studies, the main suggestions are provided from the level of government, enterprises and non-governmental organization: firstly, at the national level, the government as a policy maker should promote the concept of green-consumption, improve standards and certification systems, actively develop ecological agricultural and production bases to improve overall quality level of agricultural products, and establish an early waring system to prevent from foreign green trade barriers. Generally, government is responsible for establishing the system of perfecting agricultural standard, improving the quality level of agricultural products study and following the trail of the international standard constantly. By adopting the international standard and advanced standard of foreign countries actively and accelerating upgrade of the agricultural quality, government is supposed to take responsibility to strengthen the export competitiveness of agricultural products. Furthermore, being the regulator of import and export, government should take steps to perfect the supervision and inspection. In order to achieve the goal of introducing andimproving monitoring technology as well as enhancing our domestic products’ quality at the same level with the developed countries, we should reach the same standard with the country with advanced technology so that the barriers in import and export will be less. In addition, strengthening the quality inspection of agricultural products and system construction, examining main agricultural products with the advanced technology and accelerating the process of connections with international standards should also be our priority. We are confident that our government will assist thousands of business breaking through the “green trade barriers” and exploiting more opportunities in the global market. Secondly, enterprises should raise the green-awareness, and actively improve technology for better quality on their own initiative to avoid trade protectionism. They should also actively adopt green marketing, apply for relevant international certification and foster diversification of export market so as to expand the target market and improve the international competitiveness of agricultural products. Green marketing strategy means that enterprises should development green commodities, expand green market, nurture green nurture green consumers, establish green supply chains and enable their green commodities to enter the world market successfully under instruction of above mentioned conception. Enterprises should execute for its sustainable development conception and take environment protection as their top responsibility. Enterprises should take social interests, environment protection and customers’satisfaction into consideration during the consistent operation of current and future marketing strategy. First of all, enterprises should establish and improve the industry technology system of modern agriculture. Enterprises should take full advantage of our agriculture’s distinctive features and our specific national conditions, accelerate the innovation of system and mechanism, and promote agricultural science and technology innovation, popularization and talent training, exploring a pragmatic and efficient model of agricultural science and technology. Secondly, enterprise should invest more to innovation including introduction of technology innovation and increase technological input during the process of production. Enterprises should also focus on the employment technological training, pay more attention to the products quality,and expand the inspection for products technological contents to avoid the negative effect of the green trade barrier. Thirdly, non-governmental organizations such as industry association should enhance self-construction, establish early warning mechanisms and improve the technical standards. A main trend of development at present is to protect the environment. In general, compared with government and enterprises, NGO plays acomplementary role in dealing with green trade barriers. NGO is a vital part in the economy circle, especially in the 21st century when there aer some problems that cannot be resolved by the government alone. At president, regarded as corporation partners in the process of social economic development by developed countries government, international communities as well as most of development countries government’, NOG has achieved irreplaceable accomplishments in coping with complicated affairs involving establishing specific rules and taking the initiative of various sectors of the industry. Through profound organization innovation and institution revolution worldwide, NOG has gained strong power in dealing with green trade barriers.CaoYY. Research on the Agricultural ProductsExport in Shandong Province under Green Trade Barriers (D).The Netherland: Dongbei University of Finance and Economics.2011绿色贸易壁垒下山东省农产品出口贸易问题研究第一章介绍1.1 研究背景及意义绿色壁垒和绿色贸易保护息息相关，这提供了贸易保护者一个全新的概念并且对于国际贸易产生了巨大的影响。

外文文献翻译原文+译文

外文文献翻译原文Analysis of Con tin uous Prestressed Concrete BeamsChris BurgoyneMarch 26, 20051、IntroductionThis conference is devoted to the development of structural analysis rather than the strength of materials, but the effective use of prestressed concrete relies on an appropriate combination of structural analysis techniques with knowledge of the material behaviour. Design of prestressed concrete structures is usually left to specialists; the unwary will either make mistakes or spend inordinate time trying to extract a solution from the various equations.There are a number of fundamental differences between the behaviour of prestressed concrete and that of other materials. Structures are not unstressed when unloaded; the design space of feasible solutions is totally bounded；in hyperstatic structures, various states of self-stress can be induced by altering the cable profile, and all of these factors get influenced by creep and thermal effects. How were these problems recognised and how have they been tackled?Ever since the development of reinforced concrete by Hennebique at the end of the 19th century (Cusack 1984), it was recognised that steel and concrete could be more effectively combined if the steel was pretensioned, putting the concrete into compression. Cracking could be reduced, if not prevented altogether, which would increase stiffness and improve durability. Early attempts all failed because the initial prestress soon vanished, leaving the structure to be- have as though it was reinforced; good descriptions of these attempts are given by Leonhardt (1964) and Abeles (1964).It was Freyssineti’s observations of the sagging of the shallow arches on three bridges that he had just completed in 1927 over the River Allier near Vichy which led directly to prestressed concrete (Freyssinet 1956). Only the bridge at Boutiron survived WWII (Fig 1). Hitherto, it had been assumed that concrete had a Young’s modulus which remained fixed, but he recognised that the de- ferred strains due to creep explained why the prestress had been lost in the early trials. Freyssinet (Fig. 2) also correctly reasoned that high tensile steel had to be used, so that some prestress would remain after the creep had occurred, and alsothat high quality concrete should be used, since this minimised the total amount of creep. The history of Freyssineti’s early prestressed concrete work is written elsewhereFigure1:Boutiron Bridge,Vic h yFigure 2: Eugen FreyssinetAt about the same time work was underway on creep at the BRE laboratory in England ((Glanville 1930) and (1933)). It is debatable which man should be given credit for the discovery of creep but Freyssinet clearly gets the credit for successfully using the knowledge to prestress concrete.There are still problems associated with understanding how prestressed concrete works, partly because there is more than one way of thinking about it. These different philosophies are to some extent contradictory, and certainly confusing to the young engineer. It is also reflected, to a certain extent, in the various codes of practice.Permissible stress design philosophy sees prestressed concrete as a way of avoiding cracking by eliminating tensile stresses; the objective is for sufficient compression to remain after creep losses. Untensionedreinforcement, which attracts prestress due to creep, is anathema. This philosophy derives directly from Freyssinet’s logic and is primarily a working stress concept.Ultimate strength philosophy sees prestressing as a way of utilising high tensile steel as reinforcement. High strength steels have high elastic strain capacity, which could not be utilised when used as reinforcement; if the steel is pretensioned, much of that strain capacity is taken out before bonding the steel to the concrete. Structures designed this way are normally designed to be in compression everywhere under permanent loads, but allowed to crack under high live load. The idea derives directly from the work of Dischinger (1936) and his work on the bridge at Aue in 1939 (Schonberg and Fichter 1939), as well as that of Finsterwalder (1939). It is primarily an ultimate load concept. The idea of partial prestressing derives from these ideas.The Load-Balancing philosophy, introduced by T.Y. Lin, uses prestressing to counter the effect of the permanent loads (Lin 1963). The sag of the cables causes an upward force on the beam, which counteracts the load on the beam. Clearly, only one load can be balanced, but if this is taken as the total dead weight, then under that load the beam will perceive only the net axial prestress and will have no tendency to creep up or down.These three philosophies all have their champions, and heated debates take place between them as to which is the most fundamental.2、Section designFrom the outset it was recognised that prestressed concrete has to be checked at both the working load and the ultimate load. For steel structures, and those made from reinforced concrete, there is a fairly direct relationship between the load capacity under an allowable stress design, and that at the ultimate load under an ultimate strength design. Older codes were based on permissible stresses at the working load; new codes use moment capacities at the ultimate load. Different load factors are used in the two codes, but a structure which passes one code is likely to be acceptable under the other.For prestressed concrete, those ideas do not hold, since the structure is highly stressed, even when unloaded. A small increase of load can cause some stress limits to be breached, while a large increase in load might be needed to cross other limits. The designer has considerable freedom to vary both the working load and ultimate load capacities independently; both need to be checked.A designer normally has to check the tensile and compressive stresses, in both the top and bottom fibre of the section, for every load case. The critical sections are normally, but not always, the mid-span and the sections over piers but other sections may become critical ，when the cable profile has to be determined.The stresses at any position are made up of three components, one of which normally has a different sign from the other two; consistency of sign convention is essential.If P is the prestressing force and e its eccentricity, A and Z are the area of the cross-section and its elastic section modulus, while M is the applied moment, then where ft and fc are the permissible stresses in tension and compression.c e t f ZM Z P A P f ≤-+≤Thus, for any combination of P and M , the designer already has four in- equalities to deal with.The prestressing force differs over time, due to creep losses, and a designer isusually faced with at least three combinations of prestressing force and moment;• the applied moment at the time the prestress is first applied, before creep losses occur,• the maximum applied moment after creep losses, and• the minimum applied moment after creep losses.Figure 4: Gustave MagnelOther combinations may be needed in more complex cases. There are at least twelve inequalities that have to be satisfied at any cross-section, but since an I-section can be defined by six variables, and two are needed to define the prestress, the problem is over-specified and it is not immediately obvious which conditions are superfluous. In the hands of inexperienced engineers, the design process can be very long-winded. However, it is possible to separate out the design of the cross-section from the design of the prestress. By considering pairs of stress limits on the same fibre, but for different load cases, the effects of the prestress can be eliminated, leaving expressions of the form:rangestress e Perm issibl Range Mom entZ These inequalities, which can be evaluated exhaustively with little difficulty, allow the minimum size of the cross-section to be determined.Once a suitable cross-section has been found, the prestress can be designed using a construction due to Magnel (Fig.4). The stress limits can all be rearranged into the form:()M fZ PA Z e ++-≤1 By plotting these on a diagram of eccentricity versus the reciprocal of the prestressing force, a series of bound lines will be formed. Provided the inequalities (2) are satisfied, these bound lines will always leave a zone showing all feasible combinations of P and e. The most economical design, using the minimum prestress, usually lies on the right hand side of the diagram, where the design is limited by the permissible tensile stresses.Plotting the eccentricity on the vertical axis allows direct comparison with the crosssection, as shown in Fig. 5. Inequalities (3) make no reference to the physical dimensions of the structure, but these practical cover limits can be shown as wellA good designer knows how changes to the design and the loadings alter the Magnel diagram. Changing both the maximum andminimum bending moments, but keeping the range the same, raises and lowers the feasible region. If the moments become more sagging the feasible region gets lower in the beam.In general, as spans increase, the dead load moments increase in proportion to the live load. A stage will be reached where the economic point (A on Fig.5) moves outside the physical limits of the beam; Guyon (1951a) denoted the limiting condition as the critical span. Shorter spans will be governed by tensile stresses in the two extreme fibres, while longer spans will be governed by the limiting eccentricity and tensile stresses in the bottom fibre. However, it does not take a large increase in moment ，at which point compressive stresses will govern in the bottom fibre under maximum moment.Only when much longer spans are required, and the feasible region moves as far down as possible, does the structure become governed by compressive stresses in both fibres.3、Continuous beamsThe design of statically determinate beams is relatively straightforward; the engineer can work on the basis of the design of individual cross-sections, as outlined above. A number of complications arise when the structure is indeterminate which means that the designer has to consider, not only a critical section,but also the behaviour of the beam as a whole. These are due to the interaction of a number of factors, such as Creep, Temperature effects and Construction Sequence effects. It is the development of these ideas whichforms the core of this paper. The problems of continuity were addressed at a conference in London (Andrew and Witt 1951). The basic principles, and nomenclature, were already in use, but to modern eyes concentration on hand analysis techniques was unusual, and one of the principle concerns seems to have been the difficulty of estimating losses of prestressing force.3.1 Secondary MomentsA prestressing cable in a beam causes the structure to deflect. Unlike the statically determinate beam, where this motion is unrestrained, the movement causes a redistribution of the support reactions which in turn induces additional moments. These are often termed Secondary Moments, but they are not always small, or Parasitic Moments, but they are not always bad.Freyssinet’s bridge across the Marne at Luzancy, started in 1941 but not completed until 1946, is often thought of as a simply supported beam, but it was actually built as a two-hinged arch (Harris 1986), with support reactions adjusted by means of flat jacks and wedges which were later grouted-in (Fig.6). The same principles were applied in the later and larger beams built over the same river.Magnel built the first indeterminate beam bridge at Sclayn, in Belgium (Fig.7) in 1946. The cables are virtually straight, but he adjusted the deck profile so that the cables were close to the soffit near mid-span. Even with straight cables the sagging secondary momentsare large; about 50% of the hogging moment at the central support caused by dead and live load.The secondary moments cannot be found until the profile is known but the cablecannot be designed until the secondary moments are known. Guyon (1951b) introduced the concept of the concordant profile, which is a profile that causes no secondary moments; es and ep thus coincide. Any line of thrust is itself a concordant profile.The designer is then faced with a slightly simpler problem; a cable profile has to be chosen which not only satisfies the eccentricity limits (3) but is also concordant. That in itself is not a trivial operation, but is helped by the fact that the bending moment diagram that results from any load applied to a beam will itself be a concordant profile for a cable of constant force. Such loads are termed notional loads to distinguish them from the real loads on the structure. Superposition can be used to progressively build up a set of notional loads whose bending moment diagram gives the desired concordant profile.3.2 Temperature effectsTemperature variations apply to all structures but the effect on prestressed concrete beams can be more pronounced than in other structures. The temperature profile through the depth of a beam (Emerson 1973) can be split into three components for the purposes of calculation (Hambly 1991). The first causes a longitudinal expansion, which is normally released by the articulation of the structure; the second causes curvature which leads to deflection in all beams and reactant moments in continuous beams, while the third causes a set of self-equilibrating set of stresses across the cross-section.The reactant moments can be calculated and allowed-for, but it is the self- equilibrating stresses that cause the main problems for prestressed concrete beams. These beams normally have high thermal mass which means that daily temperature variations do not penetrate to the core of the structure. The result is a very non-uniform temperature distribution across the depth which in turn leads to significant self-equilibrating stresses. If the core of the structure is warm, while the surface is cool, such as at night, then quite large tensile stresses can be developed on the top and bottom surfaces. However, they only penetrate a very short distance into the concrete and the potential crack width is very small. It can be very expensive to overcome the tensile stress by changing the section or the prestress。

毕业论文外文文献以及中文译文

Luxury puts the shine on Chinese retailing, although the business is mostly about selling more mundane things. Hence the Shenzhen Sam's Club also stocks gallon drums of cooking oil, plastic cups and other everyday items at rock-bottom prices. The sprinkling of expensive stuff among thebargains says much about the aspirations of modern Chinese consumers, as well as the heroic efforts of the world's retailers to win a share of their wallets. The scramble to open stores has made China a paradise for shoppers, but for shopkeepers it has become a brutally competitive market in which only the strong will survive.
Stores like the one in Shenzhen show how much has changed in Chinese retailing. Just two decades ago, shops had surly staff offering a few drab items, often locked safely away in glass cases. Yet there is still a long way to go. Even today, much of the population buys from daily markets or directly from producers. ቤተ መጻሕፍቲ ባይዱrganised retailing remains relatively new. Most Chinese stores are tiny, family-run outfits. China's top 100 chains account for just a tenth of total retail sales.

英文文献全文翻译

英文文献全文翻译全文共四篇示例，供读者参考第一篇示例：English literature has a long and rich history, with countless works that have been translated into various languages around the world. From ancient epics like Beowulf and The Odyssey to modern classics like To Kill a Mockingbird and Harry Potter, English literature has captured the hearts and minds of readers for centuries.第二篇示例：The world of academic research is vast and ever-growing, with a wealth of knowledge and information being produced every day. One important aspect of this research is the publication of English-language academic articles. These articles cover a wide range of topics across various fields, from science and technology to social sciences and humanities.第三篇示例：English literature is a treasure trove of human culture and knowledge. The literary works of great writers from around theworld offer insights into the human experience, emotions, and imagination. Through the process of translation, these literary masterpieces are made accessible to a global audience, allowing people from different cultures and backgrounds to connect and appreciate the beauty of language and storytelling.第四篇示例：Abstract:Introduction:English literature holds a prominent position in the field of international academia, with a vast number of research articles, books, and journals being published in English. For researchers and scholars in non-English speaking countries, access to English literature is essential for staying up-to-date with the latest developments in their respective fields. However, understanding and interpreting English texts can present significant challenges due to linguistic, cultural, and contextual differences.Challenges in Translating English Literature:。

3000字的本科毕业外文文献翻译(格式标准)

本科毕业生外文文献翻译学生姓名：指导教师：所在学院：专业：中国·大庆2013 年5 月Chapter 1IntroductionSpread-spectrum techniques are methods by which a signal (e.g. an electrical, electromagnetic, or acoustic signal ) generated in a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons, including the establishment of secure communications, increasing resistance to natural interference and jamming, to prevent detection, and to limit power flux density (e.g. in satellite downlinks).1.1 History Frequency hoppingThe concept of frequency hopping was first alluded to in the 1903 U.S. Patent 723,188 and U.S. Patent 725,605 filed by Nikola Tesla in July 1900. Tesla came up with the idea after demonstrating the world's first radio-controlled submersible boat in 1898, when it became apparent the wireless signals controlling the boat needed to be secure from "being disturbed, intercepted, or interfered with in any way." His patents covered two fundamentally different techniques for achieving immunity to interference, both of which functioned by altering the carrier frequency or other exclusive characteristic. The first had a transmitter that worked simultaneously at two or more separate frequencies and a receiver in which each of the individual transmitted frequencies had to be tuned in, in order for the control circuitry to respond. The second technique used a variable-frequency transmitter controlled by an encoding wheel that altered the transmitted frequency in a predetermined manner. These patents describe the basic principles of frequency hopping and frequency-division multiplexing, and also the electronic AND-gate logic circuit.Frequency hopping is also mentioned in radio pioneer Johannes Zenneck's book Wireless Telegraphy (German, 1908, English translation McGraw Hill, 1915), although Zenneck himself states that Telefunken had already tried it several years earlier. Zenneck's book was a leading text of the time, and it is likely that many later engineers were aware of it. A Polish engineer, Leonard Danilewicz, came up with the idea in 1929.Several other patents were taken out in the 1930s, including one by Willem Broertjes (Germany 1929, U.S. Patent 1,869,695, 1932). During World War II, the US Army Signal Corps was inventing a communication system called SIGSALY for communication between Roosevelt and Churchill, which incorporated spread spectrum, but due to its top secret nature, SIGSALY's existence did not become known until the 1980s.The most celebrated invention of frequency hopping was that of actress Hedy Lamarr and composer George Antheil, who in 1942 received U.S. Patent 2,292,387 for their "Secret Communications System". Lamarr had learned about the problem at defense meetings she had attended with her former husband Friedrich Mandl, who was an Austrian arms manufacturer. The Antheil-Lamarr version of frequency hopping used a piano-roll to change among 88 frequencies, and was intended to make radio-guided torpedoes harder for enemies to detect or to jam. The patent came to light during patent searches in the 1950s when ITT Corporation and other privatefirms began to develop Code Division Multiple Access (CDMA), a civilian form of spread spectrum, though the Lamarr patent had no direct impact on subsequent technology. It was in fact ongoing military research at MIT Lincoln Laboratory, Magnavox Government & Industrial Electronics Corporation, ITT and Sylvania Electronic Systems that led to early spread-spectrum technology in the 1950s. Parallel research on radar systems and a technologically similar concept called "phase coding" also had an impact on spread-spectrum development.1.2 Commercial useThe 1976 publication of Spread Spectrum Systems by Robert Dixon, ISBN 0-471-21629-1, was a significant milestone in the commercialization of this technology. Previous publications were either classified military reports or academic papers on narrow subtopics. Dixon's book was the first comprehensive unclassified review of the technology and set the stage for increasing research into commercial applications.Initial commercial use of spread spectrum began in the 1980s in the US with three systems: Equatorial Communications System's very small aperture (VSAT) satellite terminal system for newspaper newswire services, Del Norte Technology's radio navigation system for navigation of aircraft for crop dusting and similar applications, and Qualcomm's OmniTRACS system for communications to trucks. In the Qualcomm and Equatorial systems, spread spectrum enabled small antennas that viewed more than one satellite to be used since the processing gain of spread spectrum eliminated interference. The Del Norte system used the high bandwidth of spread spectrum to improve location accuracy.In 1981, the Federal Communications Commission started exploring ways to permit more general civil uses of spread spectrum in a Notice of Inquiry docket. This docket was proposed to FCC and then directed by Michael Marcus of the FCC staff. The proposals in the docket were generally opposed by spectrum users and radio equipment manufacturers, although they were supported by the then Hewlett-Packard Corp. The laboratory group supporting the proposal would later become part of Agilent.The May 1985 decision in this docket permitted unlicensed use of spread spectrum in 3 bands at powers up to 1 Watt. FCC said at the time that it would welcome additional requests for spread spectrum in other bands.The resulting rules, now codified as 47 CFR 15.247 permitted Wi-Fi, Bluetooth, and many other products including cordless telephones. These rules were then copied in many other countries. Qualcomm was incorporated within 2 months after the decision to commercialize CDMA.1.3 Spread-spectrum telecommunicationsThis is a technique in which a (telecommunication) signal is transmitted on a bandwidth considerably larger than the frequency content of the original information.Spread-spectrum telecommunications is a signal structuring technique that employs direct sequence, frequency hopping, or a hybrid of these, which can be used for multiple access and/or multiple functions. This technique decreases the potential interference to other receivers while achieving privacy. Spread spectrum generally makes use of a sequential noise-like signalstructure to spread the normally narrowband information signal over a relatively wideband (radio) band of frequencies. The receiver correlates the received signals to retrieve the original information signal. Originally there were two motivations: either to resist enemy efforts to jam the communications (anti-jam, or AJ), or to hide the fact that communication was even taking place, sometimes called low probability of intercept (LPI).Frequency-hopping spread spectrum (FHSS), direct-sequence spread spectrum (DSSS), time-hopping spread spectrum (THSS), chirp spread spectrum (CSS), and combinations of these techniques are forms of spread spectrum. Each of these techniques employs pseudorandom number sequences —created using pseudorandom number generators —to determine and control the spreading pattern of the signal across the alloted bandwidth. Ultra-wideband (UWB) is another modulation technique that accomplishes the same purpose, based on transmitting short duration pulses. Wireless Ethernet standard IEEE 802.11 uses either FHSS or DSSS in its radio interface.Chapter 22.1 Spread-spectrum clock signal generationSpread-spectrum clock generation (SSCG) is used in some synchronous digital systems, especially those containing microprocessors, to reduce the spectral density of the electromagnetic interference (EMI) that these systems generate. A synchronous digital system is one that is driven by a clock signal and because of its periodic nature, has an unavoidably narrow frequency spectrum. In fact, a perfect clock signal would have all its energy concentrated at a single frequency and its harmonics, and would therefore radiate energy with an infinite spectral density. Practical synchronous digital systems radiate electromagnetic energy on a number of narrow bands spread on the clock frequency and its harmonics, resulting in a frequency spectrum that, at certain frequencies, can exceed the regulatory limits for electromagnetic interference (e.g. those of the FCC in the United States, JEITA in Japan and the IEC in Europe).To avoid this problem, which is of great commercial importance to manufacturers, spread-spectrum clocking is used. This consists of using one of the methods described in the Spread-spectrum telecommunications section in order to reduce the peak radiated energy. The technique therefore reshapes the system's electromagnetic emissions to comply with the electromagnetic compatibility (EMC) regulations. It is a popular technique because it can be used to gain regulatory approval with only a simple modification to the equipment.Spread-spectrum clocking has become more popular in portable electronics devices because of faster clock speeds and the increasing integration of high-resolution LCD displays in smaller and smaller devices. Because these devices are designed to be lightweight and inexpensive, passive EMI reduction measures such as capacitors or metal shielding are not a viable option. Active EMI reduction techniques such as spread-spectrum clocking are necessary in these cases, but can also create challenges for designers. Principal among these is the risk that modifying th e system clock runs the risk of the clock/data misalignment.2.2Direct-sequence spread spectrumIn telecommunications, direct-sequence spread spectrum (DSSS) is a modulation technique. As with other spread spectrum technologies, the transmitted signal takes up more bandwidth than the information signal that is being modulated. The name 'spread spectrum' comes from the fact that the carrier signals occur over the full bandwidth (spectrum) of a device's transmitting frequency.2.2.1Features1.It phase-modulates a sine wave pseudorandomly with a continuous string ofpseudonoise (PN) code symbols called "chips", each of which has a much shorter duration than an information bit. That is, each information bit is modulated by a sequence of much faster chips. Therefore, the chip rate is much higher than the information signal bit rate.2. It uses a signal structure in which the sequence of chips produced by the transmitter isknown a priori by the receiver. The receiver can then use the same PN sequence to counteract the effect of the PN sequence on the received signal in order to reconstruct the informationsignal.2.2.2Transmission methodDirect-sequence spread-spectrum transmissions multiply the data being transmitted by a "noise" signal. This noise signal is a pseudorandom sequence of 1 and −1 values, at a frequency much higher than that of the original signal, thereby spreading the energy of the original signal into a much wider band.The resulting signal resembles white noise, like an audio recording of "static". However, this noise-like signal can be used to exactly reconstruct the original data at the receiving end, by multiplying it by the same pseudorandom sequence (because 1 × 1 = 1, and −1 × −1 = 1). This process, known as "de-spreading", mathematically constitutes a correlation of the transmitted PN sequence with the PN sequence that the receiver believes the transmitter is using.For de-spreading to work correctly, the transmit and receive sequences must be synchronized. This requires the receiver to synchronize its sequence with the transmitter's sequence via some sort of timing search process. However, this apparent drawback can be a significant benefit: if the sequences of multiple transmitters are synchronized with each other, the relative synchronizations the receiver must make between them can be used to determine relative timing, which, in turn, can be used to calculate the receiver's position if the transmitters' positions are known. This is the basis for many satellite navigation systems.The resulting effect of enhancing signal to noise ratio on the channel is called process gain. This effect can be made larger by employing a longer PN sequence and more chips per bit, but physical devices used to generate the PN sequence impose practical limits on attainable processing gain.If an undesired transmitter transmits on the same channel but with a different PN sequence (or no sequence at all), the de-spreading process results in no processing gain for that signal. This effect is the basis for the code division multiple access (CDMA) property of DSSS, which allows multiple transmitters to share the same channel within the limits of the cross-correlation properties of their PN sequences.As this description suggests, a plot of the transmitted waveform has a roughly bell-shaped envelope centered on the carrier frequency, just like a normal AM transmission, except that the added noise causes the distribution to be much wider than that of an AM transmission.In contrast, frequency-hopping spread spectrum pseudo-randomly re-tunes the carrier, instead of adding pseudo-random noise to the data, which results in a uniform frequency distribution whose width is determined by the output range of the pseudo-random number generator.2.2.3Benefits∙Resistance to intended or unintended jamming∙Sharing of a single channel among multiple users∙Reduced signal/background-noise level hampers interception (stealth)∙Determination of relative timing between transmitter and receiver2.2.4Uses∙The United States GPS and European Galileo satellite navigation systems∙DS-CDMA (Direct-Sequence Code Division Multiple Access) is a multiple access scheme based on DSSS, by spreading the signals from/to different users with different codes.It is the most widely used type of CDMA.∙Cordless phones operating in the 900 MHz, 2.4 GHz and 5.8 GHz bands∙IEEE 802.11b 2.4 GHz Wi-Fi, and its predecessor 802.11-1999. (Their successor 802.11g uses OFDM instead)∙Automatic meter reading∙IEEE 802.15.4 (used e.g. as PHY and MAC layer for ZigBee)2.3 Frequency-hopping spread spectrumFrequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. It is utilized as a multiple access method in the frequency-hopping code division multiple access (FH-CDMA) scheme.A spread-spectrum transmission offers three main advantages over a fixed-frequency transmission:1.Spread-spectrum signals are highly resistant to narrowband interference. Theprocess of re-collecting a spread signal spreads out the interfering signal, causing it to recede into the background.2.Spread-spectrum signals are difficult to intercept. An FHSS signal simply appearsas an increase in the background noise to a narrowband receiver. An eavesdropper would only be able to intercept the transmission if they knew the pseudorandom sequence.3.Spread-spectrum transmissions can share a frequency band with many types ofconventional transmissions with minimal interference. The spread-spectrum signals add minimal noise to the narrow-frequency communications, and vice versa. As a result, bandwidth can be utilized more efficiently.2.3.1 Basic algorithmTypically, the initiation of an FHSS communication is as follows1.The initiating party sends a request via a predefined frequency or control channel.2.The receiving party sends a number, known as a seed.3.The initiating party uses the number as a variable in a predefined algorithm, whichcalculates the sequence of frequencies that must be used. Most often the period of the frequency change is predefined, as to allow a single base station to serve multiple connections.4.The initiating party sends a synchronization signal via the first frequency in thecalculated sequence, thus acknowledging to the receiving party it has correctly calculated the sequence.5.The communication begins, and both the receiving and the sending party changetheir frequencies along the calculated order, starting at the same point in time.2.3.2 Military useSpread-spectrum signals are highly resistant to deliberate jamming, unless the adversary has knowledge of the spreading characteristics. Military radios use cryptographic techniques to generate the channel sequence under the control of a secret Transmission Security Key(TRANSEC) that the sender and receiver share.By itself, frequency hopping provides only limited protection against eavesdropping and jamming. To get around this weakness most modern military frequency hopping radios often employ separate encryption devices such as the KY-57. U.S. military radios that use frequency hopping include HAVE QUICK and SINCGARS.2.3.3Technical considerationsThe overall bandwidth required for frequency hopping is much wider than that required to transmit the same information using only one carrier frequency. However, because transmission occurs only on a small portion of this bandwidth at any given time, the effective interference bandwidth is really the same. Whilst providing no extra protection against wideband thermal noise, the frequency-hopping approach does reduce the degradation caused by narrowband interferers.One of the challenges of frequency-hopping systems is to synchronize the transmitter and receiver. One approach is to have a guarantee that the transmitter will use all the channels in a fixed period of time. The receiver can then find the transmitter by picking a random channel and listening for valid data on that channel. The transmitter's data is identified by a special sequence of data that is unlikely to occur over the segment of data for this channel and the segment can have a checksum for integrity and further identification. The transmitter and receiver can use fixed tables of channel sequences so that once synchronized they can maintain communication by following the table. On each channel segment, the transmitter can send its current location in the table.In the US, FCC part 15 on unlicensed system in the 900MHz and 2.4GHz bands permits more power than non-spread spectrum systems. Both frequency hopping and direct sequence systems can transmit at 1 Watt. The limit is increased from 1 milliwatt to 1 watt or a thousand times increase. The Federal Communications Commission (FCC) prescribes a minimum number of channels and a maximum dwell time for each channel.In a real multipoint radio system, space allows multiple transmissions on the same frequency to be possible using multiple radios in a geographic area. This creates the possibility of system data rates that are higher than the Shannon limit for a single channel. Spread spectrum systems do not violate the Shannon limit. Spread spectrum systems rely on excess signal to noise ratios for sharing of spectrum. This property is also seen in MIMO and DSSS systems. Beam steering and directional antennas also facilitate increased system performance by providing isolation between remote radios.2.3.4 Variations of FHSSAdaptive Frequency-hopping spread spectrum (AFH) (as used in Bluetooth) improves resistance to radio frequency interference by avoiding using crowded frequencies in the hopping sequence. This sort of adaptive transmission is easier to implement with FHSS than with DSSS.The key idea behind AFH is to use only the “good” frequencies, by avoiding the "bad" frequency channels -- perhaps those "bad" frequency channels are experiencing frequency selective fading, or perhaps some third party is trying to communicate on those bands, or perhaps those bands are being actively jammed. Therefore, AFH should be complemented by a mechanism for detecting good/bad channels.However, if the radio frequency interference is itself dynamic, then the strategy of “badchannel removal”, applied in AFH might not work well. For example, if there are several colocated frequency-hopping networks (as Bluetooth Piconet), then they are mutually interfering and the strategy of AFH fails to avoid this interference.In this case, there is a need to use strategies for dynamic adaptation of the frequency hopping pattern.Such a situation can often happen in the scenarios that use unlicensed spectrum.In addition, dynamic radio frequency interference is expected to occur in the scenarios related to cognitive radio, where the networks and the devices should exhibit frequency-agile operation.Chirp modulation can be seen as a form of frequency-hopping that simply scans through the available frequencies in consecutive order.第一章介绍扩频技术是信号（例如一个电气、电磁，或声信号）生成的特定带宽频率域中特意传播，从而导致更大带宽的信号的方法。

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