专业英语作业
专业英语作业—15
Reading Material 15阅读材料15Chemical Industry and Environmental Protection化学工业与环境保护How can we reduce the amount of waste that is produced? And how we close the loop by redirecting spent materials and products into programs of recycling? All of these questions must be answered through careful research in the coming years as we strive to keep civilization in balance with nature.我们怎么样才能够减少化学工业产生的污染物的排放，怎么才能够使材料的产品更好地循环利用，为了自然生态的平衡，所有这些问题都是下来我们必须通过认真的研究和探索来解决的问题。
1. Life Cycle Analysis1.生命循环的分析Every stage of a product’s life cycle has an environmental impact, starting extraction of raw materials, continuing through processing, manufacturing, and transportation, and concluding with consumption and disposal or recovery. Technology and chemical science are challenged at every stage. Redesigning products and processes to minimize environmental impact requires a new philosophy of production and a different level of understanding of chemical transformations. Environment friendly products require novel materials that are reusable, recyclable, or biodegradable; properties of the materials are determined by the chemical composition and structure. To minimize waste and polluting by-products, new kinds of chemical process schemes will have to be developed. Improved chemical separation techniques are needed to enhance efficiency and remove residual pollutants, which in turn will require new chemical treatment methods in order to render them harmless. Pollutants such as radioactive elements and toxic heavy metals that cannot be readily converted into harmless materials will need to be immobilized in inert materials so that can be safely stored. Finally, the leftover pollution of an earlier, less environmentally aware era demands improved chemical and biological remediation techniques.每一个时代的产品的循环利用对环境都有着重大的影响，力争选用天然的材料，继续通过加工，制造，运输，总结与消费和处置或回收。
第一学期英文专业作业
第一学期英语作业U 11）Youmg as she is. Mary is very good at handling diffcult customers.2）After explaining his plan in great detail,Bob Suimmarized its main points in a few sentences 3)The newly-elected govermment has begun the painful process of working out its policies and strategies4）At first,Tom found it difficult to absorb what his teachers said in class.5) You will be are boyund to fail the exam if you don't do any rowiston(复习）6) Please feel free to call on us whenever you like,7)There are jobs more dangerous than truck driving,forinstance,training lions. (8)the marketing department is working on new strategies to improve the company's share of the market9)Many of the students Complained that the exam was too hard.,10)After reading the text three times,the clever boy has committed it to memory11)The doctor insisted that everything would be alright.Nevertheless I canmot help feeling anxious about the safety of the child12)Nowadays we rely more and more on computers to help us in doing everything13)Apart form being fun and good exercise,swimming is a very useful skill.14)Afer spending a year in Australia, the little girl has gained quite a good Command of spoken English3. Complete the following sentences,using the words in brackets(括号）：1)I have warmed you over and over again to keep away from drugs.(over)2)If you try to leam toomany things at atime,you may getsonfused.(time)3）We won't know ifthe plan will work untilwe put it intoprctice(practice)4)You can't learmEnglish well withoutwatching out for diomaticways of saying things.5）Peter has tried manythings with no particularsuccess,but he is bu nomeans an incapableperson (means)6)Can you turn themusic down,please?Ican't concentrate on mywork.(concentrate)7)In adlition toteaching at theuniversity,ProfessorWilson also works as alegal adviser（法律顾问）to a high-techcompany.(addition)8)If you come to myoffice,I'l tell you the storyin latai l (detail)我坚信，阅读简写的英文小说是扩大我们词汇量的一种轻松愉快的方法。
专业英语作业Nomenclature of Inorganic Chemistry
Lesson 6N omenclature of Inorganic Chemistry（无机命名法则）The IUPAC nomenclature of inorganic chemistry is a systematic method of naming inorganic chemical compounds, as recommended by the International Union of Pure and Applied Chemistry (IUPAC). Ideally, every inorganic compound should have a name from which an unambiguous formula can be determined.译文：无机化学国际纯粹与应用化学联合会命名法是国际纯粹与应用化学联合会（IUPAC）推荐的系统命名无机化合物。
理想上，每一个无机化合物都应该有一个从中可确定的名称的明确的法则。
The names "caffeine" and "3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione" both signify the same chemical. The systematic name encodes the structure and composition of the caffeine molecule in some detail, and provides an unambiguous reference to this compound, whereas the name "caffeine" just names it. These advantages make the systematic name far superior to the common name when absolute clarity and precision are required. However, for the sake of brevity, even professional chemists will use the non-systematic name almost all of the time, because caffeine is a well-known common chemical with a unique structure. Similarly, H2O is most often simply called water in English, though other chemical names do exist.译文：名称“咖啡因”和“3,7 -二氢- 1 ,3,7 -三甲基氢嘌呤- 2 ,6 -二酮”描述着同样的化学物质。
英语专业作业
UNIT NINE 911 SHOCK T HE WORLD（911震惊世界）Lesson 1 Another Pearl Harbor (又一珍珠港事件)I. Learn the following ten expressions and fill them in the sentences while listening.A. biography [♌♋♓♈❒☜♐♓] n.. 传记B. rubble [ ❒✈♌●] n. 碎石, 乱石C. fatality [♐☜♦✌●♓♦♓] n.不幸, 灾祸D. aftermath [ ♐♦☜❍✌] n.结果, 后果E. casualt ies[ ✌✞◆☜●♦♓] n.人员伤亡F. debris [ ♎♏♌❒♓ ♎♏♓♌] n碎片, 残骸H. caution s [ ☞☜⏹] vt.警告J. preliminary [☐❒♓●♓❍♓⏹☜❒♓] a.预备的, 初步的1. He came to Washington's George Washington University hospital to __________ blood.2. And hospital officials thanked the __________historian and told him the donation would not be needed at this time.3. Mr. McCullough also __________ against reacting with blame against the law enforcement and intelligence community.4. His latest book is a __________ of founding father John Adams.5. Pentagon officials say their __________ count of the number of people killed in Tuesday's terrorist attack on the defense department is 190.6. That estimate comes as recovery teams continue to remove bodies from the __________.7. Both the army and navy suffered dozens of __________ while the air force and marine corps report no deaths among their personnel.8. The highest-ranking __________ is understood to be a three-star army general.9. Recovery crews are still in the process of removing bodies from the __________.10. Meanwhile, authorities have reopened a portion of the Pentagon closed in the __________ of the terrorist attack.II. Listen to PASSAGE ONE and choose the best answer to each question.1-1. Historian Compares Terror Attacks to Pearl Harbor1. To whom the historian’s viewp oint on the attacks provides?A. John Adams.B. Two victims.C. David McCullough.D. Greg Flakus2. Where were two victims being treated?A. In Pentagon.B. Outside the hospitalC. In George Washington University Hospital.D. In Washington University.3. What tragedy did Mr. McCullough compare to Pearl Harbor Attack?A. Hawaii tragedy in 1941.B. The bombing of the federal building in 1995.C. The atom bombing in Japan in 1945.D. The Tuesday’s attacks.4. What did the 69-year-old man emphasize?A. Taking a reaction to these acts of terrorism.B. Avoiding a reaction to these acts of terrorism.C. Changing the very nature of the democratic system.D. Writing a biography of John Adams.5. What is not true to David McCullough?A. He is a historian.B. He is a Pulitzer Prize winning author.C. He donated blood needed at this time.D. He has written a book about John Adams.III. Listen to PASSAGE TWO and tick T or F for each statement.1-2. Preliminary Number of People Killed at Pentagon Stands at 1901. 126 people died. They were military and civilian Pentagon staff.2. 64 people died aboard the hijacked plane.3. The process of removing bodies was suspended because of receiving a bomb threat.4. The bomb was located at the gate of the building.5. After two hours the work crews were allowed back home.IV. Listen to PASSAGE THREE and fill in the blanks.1-3. Eyewitnesses Describe Pentagon AttackThe crash of a passenger jet into the Pentagon was witnessed by many people in a nearby U.S. military building.Workers in the Naval Annex building, which (1) __________from the Pentagon, (2) __________ by the roar of the jet's engines as it (3) __________ on its approach to the Pentagon. One man says the aircraft was flying so low that it (4) __________ on a nearby highway.After roaring past the Naval Annex, the aircraft(5) __________ the south side of the Pentagon, erupting into a massive fireball and (6) __________ into the sky. One eyewitness says the plane's impact (7) __________ in the Pentagon very close to the building's heliport control tower.Several eyewitnesses say the plane (8) __________ of the Pentagon that was recently renovated. None of the eyewitnesses could tell VOA how many people (9) __________ in that section of the building Tuesday.In the aftermath of the attack, the scene (10) __________ as controlled chaos, with police, fire trucks and ambulances streaming towards the Pentagon, while thousands of civilians and non-essential military personnel (11) __________ the other way.Authorities have (12) __________ a tight security cordon on the roads approaching the south side of the Pentagon and at least one F-16 fighter jet (13) __________ around the area for nearly an hour.V. Homework:1-4. Terrorists Attack US Military Symbol1. Learn the ten expressions chosen from PASSAGE FOUR.(1) complex [ ❍☐●♏♦] n. 联合体(2) headquarter [ ♒♏♎♦♦☜] n.司令部, 指挥部, 总部(3) tarnish [ ♦⏹♓☞] v. 失去光泽(4) civilian [♦♓♓●☜⏹] adj. 民间的, 民用的(5) evacuate [♓✌◆♏♓♦] v.疏散, 撤出; 排泄(6) alert [☜●☜♦] n.警惕, 警报(7) eyewitness [ ♋✋♦✋♦⏹✋♦] n.目击者, 见证人(8) billow [ ♌♓●☜◆] v. 翻腾，翻滚(9) airborne [ ☪☜♌⏹] adj.空降的，空运的(10) virtually [ ♦☺☜●✋] adv.事实上, 实质上2. Listen to PASSAGE FOUR and answer the following questions.(1) What could the Pentagon symbolize?(2) How many military and civilian workers at Pentagon were safe?(3) What plane was it that struck the Pentagon?.(4) When would the building reopen?.(5) What place does the Pentagon locate close to?。
专业英语大作业优选10篇(英文原文)
杜孟远PILOTING THE SMART GRIDAhmad Faruqui, Ryan Hledik and Sanem Sergici1The transformative power of the smart grid is enormous. It is receiving much consideration frutilities and commissions across North America. Several members of the European UniChina, Japan and other nations are also engaged in the same endeavor.The smart grid has the potential for revolutionizing the way we produce and consume electric but because it contains so many new elements; its core value proposition remains untested.The unanswered questions include:What new services will the smart grid provide customers?Do customers want these new services?Will they respond by changing their energy use patterns?The answers to these questions will help policymakers in federal and state government determine whether the benefits of the smart grid will cover its costs.It is widely understood that the new services enabled by the smart grid will include different rate designs that encourage curtailment of peak loads and make more efficient use of energy. Examples include dynamic pricing and inclining block rates.2These innovative rate designs will be enhanced by various automating technologies such as Energy Orbs, programmable communicating thermostats (PCTs), whole building energy management systems (Auto DR), and in-home displays (IHDs).The smart grid will of course go beyond smart meters and rate design and enable renewable energy resources to be connected to the grid. This will allow optimal use of intermittent resources, such as wind, which often reach their peak generating capacity during off-peak hours. New off-peak loads, such as plug-in hybrid electric vehicles, which reduce overall energy consumption and improve the carbon footprint, will be energized by the smart grid.To address the likely impact of the smart grid on customers, utilities, and society as a whole, it may be necessary to conduct a pilot. When should a pilot be conducted and how should it be conducted? To be useful, a pilot must yield credible results. This requires that the pilot satisfy various validity criteria. These issues form the focus of this paper. We provide examples from several recent pilots that involved dynamic pricing, a key element of the smart gird. The concluding section discusses how a hypothetical company, SMART POWER, should go about designing its own pilot. Should a Pilot be Conducted?3Policymakers should consider implementing a pilot if there is much uncertainty in the cost-benefit analysis of proceeding with full-scale deployment. A powerful method for resolving uncertainty is to assess the value of information that would be generated from a pilot. This point is best illustrated with a case study.California suffered the worst energy crisis in its history in 2001. Most analysts attributed the crisis in part to the lack of demand response in the market design. When prices rose in wholesale markets, there was no incentive for retail customers to lower demand. In the summer of 2002, the California Public Utilities Commission initiated proceedings on demand response, advanced metering, and dynamic pricing. Early in the proceedings, it became clear that the decision to deploy advanced metering was fraught with risk. The deployment would be costly and the benefits uncertain, as they depended on the customers’ price elasticity of demand.龚畅Electricity from the Oceans: Will It Really HappenAnytime Soon?By Doug PeeplesSGN News EditorGovernments and private industry have been casting a wide net to find alternative sources of sustainable power to meet accelerating demand and reduce greenhouse gas emissions. And electric power from ocean waves, tides and currents has been getting a lot more attention —and money — than ever before.But what are the chances that marine and hydrokinetic technologies (let's just call it ocean power to keep it short and sweet) are really going to take their place alongside more mature and relatively well-funded renewable energy sources such as wind and solar to feed the need for more greener power?We can't answer that question to a certainty, but we can round up a lot of the big issues: What's good about it, what's bad and what needs to happen to make ocean power a reality?The Good∙Oceans cover about 70% of the planet, and waves and tides offer a more predictable, reliable source of energy than wind and solar. And energy storage isn't an issue. The oceans are always on.∙ A British company built a large-scale tidal turbine in 2008 that's since been getting good reviews, and several countries have jumped onto the ocean power bandwagon.Globally, according to Pike Research, there are more than 300 ocean power projects"in the works." A New Jersey company has big plans for a pilot buoy project off theOregon coast and much bigger plans for a commercial-scale wave project there.∙ A January report from Pike said ocean power could generate 200 GW of electricity by 2025. A new analysis from Frost & Sullivan pegs global resources at more like2,000 to 4,000 TWh annually. The Frost & Sullivan analysis also anticipates thecommercialization of ocean power within the next 5-10 years as technology improves and production costs drop.∙In the U.S., attitudes of the federal government and private industry are taking a positive tack, too. The DOE and the Interior Department in June signed amemorandum of understanding to collaborate on commercial-scale development of offshore renewable energy projects, including wave power. The DOE has pouredmillions of dollars into hydrokinetic R&D and has put the technological and strategic muscle of its national laboratories behind it.The Bad∙Ocean power is still in the proof-of-concept phase, and initial deployments require unimaginably massive investments. Will investors bet on technologies with nosignificant track record and sky high upfront costs?∙While wave power is more reliable than wind and solar, the actual power in waves fluctuates a lot, as does the state of the oceans in general. Durability is a big issue.Pelamis Wave Power, which operated a highly regarded commercial-scale wave farm in Portugal, shut down its operations last year because of persistent technicalproblems and dwindling financing.∙How will regulations to protect aquatic ecosystems and fisheries evolve? The permitting and siting process for land-based renewable energy projects is complicated enough. The marine environment is more complex, so it seems reasonable thatpermitting and siting for ocean projects will be even more complicated.∙Standardizing technologies, connecting wave power to the electric grid and transmission also present obstacles.That Said, What's It All Mean?Who wouldn’t want to see a new, reliable, secure and green energy source? But even the most optimistic reports and analyses come with heavy disclaimers, most of them pointing at exceptionally high upfront costs and technological nightmares similar to those facing the new deepwater wind farm sector. While the future of ocean power looks a little brighter, it still looks like a long slog to the light at the end of the tunnel.What do YOU think? Will be generating significant amounts of electricity from ocean waves anytime soon ... if ever?甘凯元Radioactive Water Leaking From Crippled Japan Plantby The Associated PressWorkers spray resin on the ground near the reactor buildings to prevent the spread of radioactive substances at the Fukushima Dai-ichi nuclear power plant.April 2, 2011Highly radioactive water was leaking into the sea Saturday from a crack discovered at a nuclear power plant destabilized by last month's earthquake and tsunami, a new setback as frustrated survivors of the disasters complained that Japan's government was paying too much attention to the nuclear crisis.The contaminated water will quickly dissipate into the sea and is not expected to cause any health hazard. Nevertheless, the disturbing discovery points at the unexpected problems that can crop up and continue to hamper technicians trying to control the crisis.Word of the leak came as Prime Minister Naoto Kan toured the town of Rikuzentakata, his first trip to survey damage in one of the dozens of villages, towns and cities slammed by the March 11 tsunami that followed a magnitude 9.0 earthquake."The government has been too focused on the Fukushima power plant rather than the tsunami victims. Both deserve attention," said 35-year-old Megumi Shimanuki, who was visiting her family at a community center converted into a shelter in hard-hit Natori, about 100 miles from Rikuzentakata.The double disaster is believed to have left nearly 25,000 dead — 11,800 confirmed. More than 165,000 are still living in shelters, and tens of thousands more still do not have electricity or running water.Although the government had rushed to provide relief, its attention has been divided by the efforts to stabilize the Fukushima Dai-ichi nuclear plant, which suffered heavy damage and has dragged the country to its worst nuclear crisis since the atomic bombings of Hiroshima and Nagasaki during World War II.The plant's reactors overheated to dangerous levels after electrical pumps — deprived of electricity — failed to circulate water to keep the reactors cool. A series of almost daily problems have led to substantial amount of radiation leaking in the atmosphere, ground and sea.On Saturday, workers discovered an 8-inch long crack in a maintenance pit that was leaking highly radioactive water into the Pacific Ocean, said Japan Nuclear and Industrial Safety Agency spokesman Hidehiko Nishiyama.He said the water contaminated with levels of radioactive iodine far above the legal limit found inside the pit could be one of the sources of recent spikes in radioactivity in sea water."There could be other similar cracks in the area, and we must find them as quickly as possible," he told reporters.Soon after the discovery, the plant's operator, Tokyo Electric Power Co., started filling the pit with cement to seal the crack and prevent more contaminated water from seeping into the ocean.Nuclear safety officials said the crack was likely caused by the quake and may be the source of radioactive iodine that started showing up in the ocean more than a week ago.People living within 12 miles of the plant have been evacuated and the radioactive water will quickly dissipate in the sea, but it was unclear if the leak posed any new danger to workers. People have been uneasy about seafood from the area despite official reassurances that the risk of contamination is low.The cracked pit houses cables for one of the six nuclear reactors, and the concentration of radioactive iodine was the same as in a puddle of contaminated water found outside the reactor earlier in the week. Because of that, officials believe the contaminated water is coming from the same place, though they are not sure where.A nuclear plant worker who fell into the ocean Friday while trying to board a barge carrying water to help cool the plant did not show any immediate signs of being exposed to unsafe levels of radiation, nuclear safety officials said Saturday, but they were waiting for test results to be sure.Radiation worries have compounded the misery for people trying to recover from the tsunami. Kan's visit Saturday to Rikuzentakata did little to alleviate their worries."The government fully supports you until the end," Kan told 250 people at an elementary school serving as an evacuation center. He earlier met with the mayor, whose 38-year-old wife was swept away.He bowed his head for a moment of silence in front of the town hall, one of the few buildings still standing, though its windows are blown out and metal and debris sit tangled out front.Kan also stopped at the sports complex being used as a base camp for nuclear plant workers, who have been hailed as heroes for laboring in dangerous conditions. He had visited the nuclear crisis zone once before, soon after the quake.Workers have been reluctant to talk to the media about what they are experiencing, but one who spent several days at the plant described difficult conditions in an anonymous interview published Saturday in the national Mainichi newspaper.When he was called in mid-March to help restore power at the plant, he said he did not tell his family because he did not want them to worry. But he did tell a friend to notify his parents if he did not return in two weeks."I feel very strongly that there is nobody but us to do this job, and we cannot go home until we finish the work," he said.Early on, the company ran out of full radiation suits, forcing workers to create improvised versions of items such as nylon booties they were supposed to pull over their shoes."But we only put something like plastic garbage bags you can buy at a convenience store and sealed them with masking tape," he said.He said the tsunami littered the area around the plant with dead fish and sharks, and the quake opened holes in the ground that tripped up some workers who could not see through large gas masks. They had to yell at one another to be heard through the masks."It's hard to move while wearing a gas mask," he said. "While working, the gas mask came off several times. Maybe I must have inhaled much radiation."Radiation is also a concern for people living around the plant. In the city of Koriyama, Tadashi and Ritsuko Yanai and their 1-month-old baby have spent the past three weeks in a sports arena converted into a shelter. Baby Kaon, born a week before the quake, has grown accustomed to life there, including frequent radiation screenings, but his parents have not. Their home is fine, but they had to leave because it is six miles from the nuclear plant.Asked if he had anything he would like to say to the prime minister, Tadashi, a32-year-old father, paused to think and then replied: "We want to go home. That's all, we just want to go home."In Natori, where about 1,700 people are living in shelters, others had stronger words for Kan. Toru Sato, 57, lost both his wife and his house in the tsunami and said he was bothered that Kan's visit to the quake zone was so brief about a half day."He's just showing up for an appearance," Sato said. "He should spend time to talk to various people, and listen to what they need."黄松强AEP, ITC Transmission to perform technical study on expanding 765-kV transmission into MichiganCOLUMBUS, Ohio, Nov. 6, 2006 – American Electric Power (NYSE: AEP) has signed a memorandum of understanding (MOU) with ITC Transmission, a subsidiary of ITC Holdings Corp. (ITC), to perform a technical study to evaluate the feasibilityof extending AEP’s 765-kilovolt (kV) transmission infrastructure through Michigan to enhance reliability and support a competitive market of generation supply.The study will explore the merit and benefits of building a 765-kV transmission network in Michigan’s Lower Peninsula that would link to AEP’s 765-kV transmission system in the Midwest. The study will be shared with the Midwest ISO (MISO) and the Michigan Public Servic e Commission’s (MPSC) 21st Century Energy Planning team.The study is projected to be complete in late 2006, in time for it to be shared with the MPSC 21st Century Planning team before they complete their deliberations. The MOU signed with ITC Transmission does not include provisions to build or operate transmission. Any future activities regarding Michigan transmission will be determined after the completion of the study.―Through this agreement, we will work with ITC Transmission to determine the benefits of enhancing the Michigan transmission grid by introducing 765-kV lines, the most robust transmission in the U.S., and linking it to AEP’s 2,100-mile 765-kV transmission network in the Midwest. After the completion of the study, we will provide our analysis to the Michigan Public Service Commission, Midwest ISO and other parties to help them determine the best way to serve Michigan’s future electric reliability needs and support a successful competitive marketplace,‖ said Michael G. Morris, AEP’s chairm an, president and chief executive officer.―ITC Transmission continues in its mission to invest in the transmission infrastructure as a means to improve electric reliability for its customers and lower the overall cost of delivered energy,‖ said Joseph L. Welch, president and chief executive officer of ITC Transmission. ―The transmission grid in Michigan has suffered after a 30-year trend of underinvestment, and we must begin actively looking to implement a long-term solution that will address Michigan’s current electric reliability needs now and for years to come.‖―ITC Transmission, a subsidiary of ITC Holdings Corp. (NYSE: ITC), is the first independently-owned and operated electricity transmission company in the United States. ITC Holdings Corp. is in the business of investing in electricity transmission infrastructure improvements as a means to improve electric reliability, reduce congestion and lower the overall cost of delivered energy. Through its operating subsidiaries, ITC Transmission and METC, it is the only publicly traded company engaged exclusively in the transmission of electricity in the United States. ITC is also the largest independent electric transmission company and the tenth largest electric transmission company in the country based on transmission load served. ITC Transmission and METC operate contiguous, fully regulated, high-voltage systems in Michigan´s Lower Peninsula, an area with a population of approximately 9.8 million people, that transmit electricity to local electricity distribution facilities fromgenerating stations throughout Michigan and surrounding areas. For more information on ITC Holdings Corp., please visit . For more information on ITC Transmission or METC, please visit or , respectively.American Electric Power is one of the largest electric utilities in the United States, delivering electricity to more than 5 million customers in 11 states. AEP ranks among the nation’s largest generators of electricity, owning nearly 36,000 megawatts of generating capacity in the U.S. AEP also owns the nation’s largest electricity transmission system, a nearly 39,000-mile network that includes more 765 kilovolt extra-high voltage transmission lines than all other U.S. transmission systems combined. AEP’s utility units operate as AEP Ohio, AEP Texas, Appalachian Power (in Virginia and West Virginia), AEP Appalachian Power (in Tennessee), Indiana Michigan Power, Kentucky Power, Public Service Company of Oklahoma, and Southwestern Electric Power Company (in Arkansas, Louisiana and east Texas). American Electric Power, based in Columbus, Ohio, is celebrating its 100th anniversary in 2006.杨萌Siemens Residential Surge Protection —Implementing the Right Line of Defense on the Home FrontUnexpected voltage spikes, surges and other electrical disturbances can ruin or severely damage computers, VCRs, televisions, fax machines, scanners and copiers, disrupt satellite signals, degrade the performance of audio/video components, and wreak havoc with telecommunications systems.Because no single device can protect an entire home or office against all electrical surges, the best way to prevent damage is by implementing a systematic, tiered surge protection plan that monitors every possible incoming signal path and protects against internally generated power fluctuations, providing protection at the service entrance and at the point of use.Protection at the point of entryThe first line of defense is protection at the point of entry where electricity,surges and voltage spikes from lightning hits can enter the electrical system. This requires an electrician-installed secondary surge arrestor or transient voltage surge suppressor installed at the service entrance to limit surge voltage by diverting and conducting large surge currents safely to ground. If an AC surge arrestor does its job right, it shields motor-driven appliances like refrigerators, dishwashers, electric washers, and dryers from damage. Additional specialized service entrance protectors can be added to protect cable TV and telephone lines, and minimize damage to TVs and modems. Homeowners also can arrange for installation of branch circuit feeder devices or trips in circuit breaker panels to prevent surges from damaging equipment on specific circuit branches.Protection at the point of useThe second line of defense is the point of use. Here, homeowners can reinforce point-of-entry protection by installing plug-in surge protectors (strips) into grounded wall receptacles where sensitive electronic equipment is located. These plug-in protectors, which generally have much lower limiting voltages than entry protectors, defend against externally and internally generated surges that travel through power, phone, data, and coaxial lines. Plug-in power strips should minimally include AC power protection and appropriate signal line protection and should protect against both catastrophic and small surges. These devices should be installed wherever expensive or sensitive electronic equipment like computers, VCRs, fax machines, PCs with modems, satellite systems, stereo systems, copiers and scanners are located. All types of equipment with signal lines, such as phones, cable TV, and satellites should be equipped with multi-port protectors, which protect signal and AC lines.If you have any questions or are interested in purchasing our surge protection products, please contact us via e-mail or call 1-800-964-4114.胡嘉滨Energy Storage: Can It Replace Transmission?Grid-scale storage offers potential benefits to transmission and distribution systems of utilities in regulated and market environments. These benefits derive from cost reductions due to the time and location shifting of energy for congestion relief, reliability via enhanced stability and outage response, and incremental voltage support—once the storage device and its power electronics are in place. .Between the transmission and distribution systems, at the subtransmission or distribution substation, storage can defer capital expenditures for power transformer upgrades to meet peak load conditions. In remote areas served by radial subtransmission, storage can also be a vehicle for reliability improvement as a way to ride through un-cleared faults on the transmission line(s) that serve the substation.The potential T&D CapEx deferral angle is an interesting area to explore. One example for a substation application is to support power transformer contingency operations during peak load periods that have grown in excess of the N-1 contingency capacity of the station.This potential application, however, suffers from the same barriers today as the transmission congestion relief application:•The planning and operational methodologies are not established•The regulatory process for approval is nonexistent•It, again, crosses the boundary between transmission and distribution regulated functionality and merchant functionality, because it potentially shifts off-peak energy to on-peak delivery.In addition, as this typical substation application is likely to be in the range of 1-10 MW, it may not require centralized storage systems, but rather distributed or utility-scale devices. As previously noted, these could be portable or semi-portable in nature.One More Hurdle … For Now, At LeastAn additional hurdle that needs to be mentioned is costs. One reason multiple roles are applied to a storage device is for a means to create additional revenue that can defer initial cost for the technologies. However, this hurdle needs to be evaluated in the context of an emerging technology and not ―set‖ at current levels.Advanced energy storage technologies are still in a rapid state of evolution and development. Hence, when comparing options, solutions for areas such as CapEx deferral need to be weighed not only against today’s current options, but also with expected prices of future technologies. The intent isn’t to mask cost as a hurdle; rather, there are a number of diffe rent technologies nearing demonstration stages that have potential to alter the current cost of devices. This perceived ―cost‖ hurdle may become a moot point in the near future.Storage is not yet in widespread use to the point that it could serve as a consistent application to defer new transmission. As challenges of siting new transmission continue though, additional modeling of energy storage going forward can help to understand its benefits for a given capacity challenge better.梁诗密A secure energy future requires that we use energy more efficiently and responsibly and improve the performance of the energy delivery system. We launched gridSMART® in 2007 to give customers greater control over their energy usage, increase the efficiency of the electric grid, improve service to our customers and lead us to a new era of energy delivery.From a technology standpoint, gridSMART® incorporates a two-way communications system between AEP and our customers that facilitates the more efficient use of electricity. For example, gridSMART® may allow us to send price signals to customers so they can decide when to run home appliances. It can also allow us to adjust customer thermostats automatically, with their pre-approval, when demand is high and we need to lessen the stress on the electric grid.AEP Ohio is pursuing a comprehensive gridSMART® project involving 110,000 smart meters and distributed grid management technologies on 70 circuits. The $150 million project was funded with a $75 million grant from the DOE, in-kind contributions from vendors and regulatory recovery support from Ohio regulators. The project features smart meters,time-of-use tariffs, home energy use display devices, smart grid-enabled appliances, plug-in electric vehicles, distributed automation equipment, community energy storage devices and a cyber security center.Our most extensive smart meter deployment project is in Texas, where we are installing close to 1 million smart meters. In addition, Indiana Michigan Power Co. (I&M) and Public Service Company of Oklahoma (PSO) are deploying smart grid technology pilots in their states.Our initial goal was to install 5 million smart meters by 2015 throughout the AEP system. Through our early deployments we hope to determine if the expense of the meters is offset by the benefits. We will continue to pursue the deployment of these smart grid technologies where regulators are supportive and there is a proven business case. We believe modernizing the grid is critical to reducing demand and energy consumption, contributing to energy reliability and security, and preparing for the future needs of customers.Get a state-by-state breakdown of gridSMART initiativesWe believe gridSMART® will transform our relationship with our customers and through our current projects we are learning more about how that will occur. For example, we have learned that:The technology that allows us to manage the grid from our back office systems, such as remote operation of the meter and distribution automation equipment, works asexpected. The technology that goes beyond the meter, into the customers’ home, is still evolving.A significant number of customers who participated in the time-of-day rate plan didshift their demand to different times. In a larger scale deployment, this program could provide relief to the distribution systems during peak times.Better system management, fewer crew trips, reduced fuel consumption, better energy theft detection and streamlined billing can create cost savings.When customers agree to the program, we can directly control electric use through wireless technology (e.g. a two-way communicating thermostat) which allows us to raise the temperature in homes to ease stress on the grid and help customers save energy during the cooling season.More education of consumers will be needed in future projects.For more data, please see indicators EU1 through EU12 of AEP's Global Reporting Initiative Electric Utility Sector Supplement.吕思颖Are geothermal power plants safe?For all our hand-wringing over the oil supply, it might shock you to realize that the solution to our dependence on fossil fuels lies right under our feet. In Western states like California, Nevada, Idaho, Alaska and Hawaii, underground pockets of geothermal energy — hot rock, superheated water and steam — can be tapped to generate electricity. According to backers of geothermal technology like Google, this carbon-neutral, inexhaustible energy source could meet 15 percent of America's electricity needs by 2030.Harnessing SteamIn the simplest geothermal power plant, called a dry steam plant, a well is drilled into the rock to tap a steam reservoir. The steam escapes the well under great pressure, which is used to turn a turbine and generate electricity.Since steam deposits aren't as common as hot water and hot rock reserves, the most promising geothermal technology is called a binary-cycle power plant. In this system, hot water from a deep well circulates through a heat exchanger. There, the。
专业英语作业1
《专业英语》作业global corporation全球公司economic boom 经济繁荣Ownership 所有权joint-venture合资企业headquarters 总部Competitive Advantage 竞争优势Entrepreneur企业家equity股权Insurance costs 保险费用bargaining power 议价能力overhead开销Insurance Company 保险公司stock options股票期权consumer appliance 家电消费Insurance contract 保险合同performance-based pay 基础薪酬policy-holder 投保人Commission 佣金personal effects 个人财物natural calamities 自然灾害Decision 决策insurance amount 保险金额insurance coverage 保险保障Venture Capital 风险资本marine coverage 海险salvage charge 救助费用Food chain 食物链general average 共同海损mass production 大规模生产containerization 集装箱distributor 经销商Chain stores 连锁商店phone interview 电话面试vending machine 自动售货机Selling point 卖点billboard 广告牌cinema commercials 影院广告Promotions 促销leaflet 传单poster 海报Search engine 搜索引擎stock prices股票价格Financial crisis 金融危机intellectual capital 智力资本national asset 国家资产Business Model 商业模式Electronic commerce 电子商务Globalization 全球化1、The multinational is big and rich. It often operates in industries which are difficult to enter and of vital national importance, e.g. the computer, chemical and automobile industries. Most important of all, the main objective of the multinational is to organize its activities around the world so as to maximize global profits and global market shares. Each subsidiary is part of an international network of affiliates. These all interact with each other. Each part serves the whole. The center controlling the network—the multinationals’ headquarters—is not under the control of the host government. It is frequently thousands of miles away from these subsidiaries.跨国公司不仅大而且富有。
专业英语-作业
自动控制系统
控制量 末端元件 输出响应
Task 5
1.Tanslate the following paragraph into Chinese. • There are several possible ways to classify relays: by functions, by construction, by application. Relays are one of two basic types of construction: electro magnetic or solid state. The electro magnetic type relies on the development of electro magnetic forces on movable members, which provide switching action by physically opening or closing sets of contacts. The solid state variety provides switching action with no physical motion by changing the state of serially connected solid state component from non-conducting to conducting. Electro magnetic relays are older and more widely used; solid state relays are more versatile, potentially more reliable, and fast.
2.Tanslate the following terms into English.
大三专业英语作业(微生物翻译)
微生物的范围难以界定促使罗杰Dtanier提议，这个领域不仅要从它研究对象的
大小，而且要从它研究的方法技巧等方面来定义。
Add you title
一个微生物学家首先 把一个特定的微生物
A microbiologist usually first isolates a specific microoorganism from a population and then cultures it.
不清楚地生物体的研究，也就是研究微小生物。
Add you title
Its subjects are
viruses,bacteria,many
它研究的对象有病毒，细 菌，各种藻类，菌类和原 生动物。
algae and fungi,and
protozoa.
Add you title
Yet other members of these groups,particularly some of the algae and fungi,are larger and quite visible.
text
text text
余的显微镜使用者----荷
兰的列文虎克
Part one
Add Your Text Leeuwenhoek earned his living as a draper and haberdasher ,but spent much of his spare time
constructing simple microscopes lamo Fracastoro 认为疾病是由看不见得生活生
disease was caused by
invisible living creatures.
专业英语作业1英译中(Why Study Management)
Why Study Management?为什么学习管理?Learning about management is important for two reasons.学习管理很重要，原因有二。
First, our society depends on specialized institutions and organizations to provide the goods and services we desire.首先，我们的社会依靠专门的机构和组织来提供我们想要的商品和服务。
These organizations are guided and directed by the decisions of one or more individuals designated as "managers."这些组织由一个或多个被指定为“管理者”的个人的决定来指导和指导。
In market-based economy, it is managers who allocate society's resources to various and often competing ends.在市场经济中，是管理者将社会资源分配给各种各样的、往往是相互竞争的目标。
Managers have the authorities and responsibility to build safe or unsafe products, seek war or peace, build or destroy cities, or clean up or pollute the environment. 管理人员有权力和责任建造安全或不安全的产品，谋求战争或和平，建造或摧毁城市，或清理或污染环境。
Managers establish the conditions under which we are provided with jobs, incomes, lifestyles, products, services, health care, and knowledge.管理者为我们提供工作、收入、生活方式、产品、服务、医疗保健和知识。
专业英语结课作业
专业英语结课作业通信与信息工程学院专业英语结课作业班级：姓名：学号：指导教师：作业时间：成绩：评语：通信与信息工程学院二〇一五年Passage B Binary System and Logic Systems1.Binary SystemA digital system functions in a binary manner.It employs devices which exist only in two possible states.A transistor is allowed to operate at cutoff or in saturation, but not in its active region.A node may be at high voltage of, say, 4±1V or at a low voltage of, say, 0.2±0.2V, but no values are allowed.Various designations are used for these two quantized states, and the most common are listed in Table 3.1.In logic,a statement is characterized as true or false, and this is the first binary classification listed in the table. A switch may be closed or open, which is the notation under 9, etc.Binary arithmetic and mathematical manipulation of switching or logic functions are best carried out with classification 3, which involves two symbols, 0(zero) and 1 (one).The binary system of representing numbers will now be explained by making reference to the familiar decimal system.Inthe latter the base is 10(ten), and ten numerals,0,1,2,3···,9, are required to express an arbitrary number.To write numbers larger than 9, we assign a meaning to the position of numerals in an array of numerals.For example, the number 1264 (one thousand two hundred sixty four) has the meaning1264=1×103＋2×102＋6×101＋4×100Thus the individual digits in the number represent the coefficients in an expansion of the number in powers of 10.The digit which is farthest to the right is the coefficient of the zeroth power; the next is the coefficient of the firth power.and so on.In the binary system of representation the base is 2, and only two numerals 0 and 1are required to represent a number.The numerals 0 and 1 have the same meaning as in the decimal system ,but a different interpretation is placed on the position occupied by a digit.In the binary system the two rather than ten as in the decimal system.For example, the decimal number 19 is written in the binary representation as 10011 since10011=1×24＋0×23＋0×22＋1×21＋1×20 =16＋0＋0＋2＋1=19A short list of equivalent numbers in decimal and binary notations is given in Table3.2.A general method for converting from a decimal to a binary number is indicated in Table 3.3.The procedure is the following.Place the decimal number (in this illustration,19) on the extreme right.Next divide by 2 and place the quotient (9) to the left and indicate the remember (1) directly below it.Repeat this process (for the next column 9÷2=4 and a remainder of 1) until a quotient of 0 is obtained.The array of 1’s and 0’s in the second row is the binary representation of the origin decimalnumber.In this example, decimal 19=10011 binary.A binary digit (a 1 or a 0) is called a bit.A group of bits that has the same significance is called a byte, word, or code.For example, to represent the 10 numerals (0,1,2,3···,9) and the 26 letters of the English alphabet would require 36 different combinations of 1’s and 0’s.Since 25<36<26, then a minimum of 6 bits per bit arerequired in order to accommodate all the alphanumeric characters.In this sense a bit is sometimes referred to as a character and a group of one or more characters as a word.2. Logic SystemsIn a DC, or level-logic, system a bit is implemented as one of two voltage levels.If, as in Figure 3.6(a), the more positive voltage is the 1 level and the other is the 0 level, the system is said to employ DC positive logic.On the other hand, a DC negative-logic system,as in Figure 3.6(b),i s one which designates the more negative voltage state of the bit as the 1 level and the more positive as the 0 level.It should be emphasized that the absolute values of the two voltages are of no significance in these definitions.In particular, the 0 state need not represent a zero voltage level (although in some systems it might).The parameters of a physical device (for example,VCE·sat of a transistor) are not identical from sample to sample,and they also vary with temperature.Furthermore, ripple or voltage spikes may exist in the power supply or ground leads, and other sources of unwanted signals, called noise,may be present in the circuit.For these reasons the digital levels are not specified precisely, but as indicated by the shaded region in Figure 3.6,each state is defined by a voltage range about a designated level, such as 4±1V and 0.2±0.2V.In a dynamic,or pulse-logic,system a bit is recognized by the present or absence of a pulse.At 1 signifies the existence of a positive pulse in a dynamic positive-logic system; a negative pulse denotes a 1 in a dynamic negative-logic system a 0 at a particular input (or output) at a given instant of time designates that no pulse is present at that particular moment.B篇二进制系统和逻辑系统1.二进制系统一个数字系统作用以二进制方式。
专业英语作业答案
专业英语作业答案<i>答案</i>Part IWater Supply and Drainage Engineering offers a particular challenge because almost every process of wastewater treatment that is designed and built by engineers is unique. 给排水工程提出了特殊的挑战，因为由工程师设计建造的每个废水处理工艺几乎都是唯一的。
Be strict to the examination and approval of the new projects in Huaihe River basin, and carry out the environment influence assessment system. The projects which are not in accord with the Tenth-Five year plan should not be approved. 严格淮河流域新建项目的审批，实行环境影响评价制度，不符合十五淮河流域水污染防治工作计划的一律不得审批。
Once a project has been identified, the next step is a preliminary or feasibility study to consider in detail the implementation of alternatives, together with approximate costs. For example, water system study alternatives for a region might include：(1) possible service areas and combinations; (2) a well-water supply with water softening and iron removal; (3) an upland lake or reservoir with multipurpose uses requiring land question, water rights, and a conventional water treatment plant. 确定项目后首先需开展的工作是进行前期和可行性研究，其内容包括考虑实施备选方案的各个环节和估算大致的费用。
机械专业英语作业4
1. As is known to air, air is a mixture of gases.大家知道，空气是多种气体的混合物。
2. Mercury is by no means abundant nor widely distributed.水银的贮藏量并不丰富，分布也不广。
3. It is known to all that acids turn blue litmus red.众所周知，酸类能使蓝色石蕊变红。
4. Solids expand and contract as liquids and gases do.跟液体和气体一样，固体也能膨胀和收缩。
5. They have fulfilled their work ahead of schedule, so have we.他们提前完成了他们的工作，我们也提前完成了我们的工作。
6. Now, radar is a commonly used technique by which people can see the things beyond their visibility.现今，雷达是一种常用的技术，利用雷达人们可以看到视线以外的东西。
7. There are two approaches to stabilization of the operating currents and voltages.要稳定工作电流和电压有两种方法。
8. The laser is able to amplify light, where necessary, millions of times.激光可以放大光线，必要的时候可以放大数百万倍。
9. The result of the check indicated that actual error probabilities were of the order of one percent. 检查的结果表明，实际的误差概率大约是1%。
西南大学《专业英语》网上作业及参考答案
===================================================================================================参考答案：1、数字（激光）视盘，DVD2. （文）字处理程序3. 存储（器）芯片，内存芯片===================================================================================================4. 密码电报5. 蜂窝电话，移动电话，手机6. 集成电路7. 电子邮件网规，电子邮件网络礼节8. 电子邮件常规9. 点击图标10. 密件，秘密文件11. 密级信息12. 签名文件13. 主存储器14. 虚拟存储器，虚拟内存15. 分时段的多任务处理16. 桌面操作系统17. 电子游戏机18. 电子数据表程序，电子制表程序19. 存储寄存器20. 函数语句21. 关系（型）语言22. 面向对象语言23. 汇编语言24. 中间语言，中级语言25. 人工智能1£º[ÂÛÊöÌâ]Ç뽫ÏÂÁÐÓ¢ÎÄÒëΪÖÐÎÄ£º1£®A computer system includes a computer, peripheral devices, and software. The electric,electronic, and mechanical devices used for processing data are referred to as hardware. In additionto the computer itself, the term "hardware¡±refers to components called peripheral devices thatexpand the computer's input, output, and storage capabilities. Computer hardware in and of itselfdoes not provide a particularly useful mind tool. To be useful, a computer requires a set ofinstructions, called software or a computer program, which tells the computer how to perform aparticular task. Computers become even more effective when connected to other computers in anetwork so users can share information.2. Many schools and businesses have established e-mail privacy policies, which explain the=================================================================================================== condition under which you can and cannot expect your e-mail to remain private. These policies aresometimes displayed when the computer boots or a new user logs in. Court decisions, however,seem to support the notion that because an organization owns and operates an e-mail system, thee-mail message on that system are also the property of the organization. The individual who authorsan e-mail message does not own all rights related to it. The company or school that supplies youre-mail account can, therefore, legally monitor your messages. You should use your e-mail accountwith the expectation that some of your mail will be read from time to time. Think of your e-mail asa postcard, rather than a letter, and save your controversial comments for face-to-faceconversations.3£®Multitasking, in computer science, is a mode of operation offered by an operating system inwhich a computer works on more than one task at a time. There are several types of multitasking.Context switching is a very simple type of multitasking in which two or more applications areloaded at the same time but only the foreground application is given processing time; to activate abackground task, the user must bring the window or screen containing that application to the front.In cooperative multitasking, background tasks are given processing time during idle times in theforeground task (such as when the application waits for a keystroke), and only if the applicationallows it. In time-slice multitasking, each task is given the microprocessor's attention for a fractionof a second. To maintain order, tasks are either assigned priority levels or processed in sequentialorder. Because the user's sense of time is much slower than the processing speed of the computer,time-slice multitasking operations seem to be simultaneous.4. One especially powerful feature of OOP (objected-oriented programming) languages is aproperty which is known as inheritance. Inheritance allows an object to take on the characteristicsand functions of other objects to which it is functionally connected. Programmers connect objectsby grouping them together in different classes and by grouping the classes into hierarchies. Theseclasses and hierarchies allow programmers to define the characteristics and functions of objectswithout needing to repeat source code, the coded instructions in a program. Thus, using OOPlanguages can greatly reduce the time it takes for a programmer to write an application, and alsoreduce the size of the program. OOP languages are flexible and adaptable, so programs or parts ofprograms can be used for more than one task. Programs written with OOP languages are generallyshorter in length and contain fewer bugs, or mistakes, than those written with non-OOP languages.5. In software, a bug is an error in coding or logic that causes a program to malfunction or toproduce incorrect results. Minor bugs-for example, a cursor that does not behave as expected-canbe inconvenient or frustrating, but not damaging to information. More severe bugs can cause aprogram to "hang¡± (stop responding to commands) and might leave the user with no alternativebut to restart the program, losing any previous work that has not been saved. In either case, theprogrammer must find and correct the error by the process known as debugging. Because of thepotential risk to important data, commercial application programs are tested and debugged ascompletely as possible before release. Minor bugs found after the program becomes available arecorrected in the nest update; more severe bugs can sometimes be fixed with special software, called=================================================================================================== patches, that circumvents the problem or otherwise reduces its effects.²Î¿¼´ð°¸£º´ð°¸¼û½Ì²Äÿ¿ÎºïµÄ²ÒëÁ²Ï°´ð°¸¡£1：[论述题]请选择下列一个题目写一篇不低于150个词的英文短文.1. The advantages of computer2. How to work with computer?3. How computers change our life?4. My view on chat on the Internet5. My view on computer security参考答案：要求文章用词简单，拼写正确，语法无大的错误，不偏题。
专业英语作业
Unit 3 Introduction of Automation Specialty自动化专业概论Automation science and technologies have been playing a key role in the development of 自动化科学与技术在人类历史上科学与技术发展过程中一直扮演着一个关键角色。
science and technology in human history. Automation and Control educates within the fields of自动化与控制教育领域内的自动化，控制和机器人技术。
automation,control and robotics. The major of automation is kept for undergraduate program to自动化专业本科计划保持满足技术创新和社会主义市场经济meet the needs of technical innovation and socialist market economy,to strengthen the的需要，加强基础知识和拓宽专业范围。
fundamental expertise and to broaden the professional scope. Students in the Specialty of Automation are expected to establish solid engineering basis and obtain sound professional自动化专业的学生对电工，电子技术，控制理论，测量仪表，系统工程，计算机技术和网络knowledge in Electrotechnics,Electronics,Control Theory,Sensing & Instrumentation,System技术的应用4年的学习后获得良好的专业知识奠定坚实的工程基础。
专业英语作业答案
Solutions 1Question 1-5C BD D AQuestion 6(1) Accounting is not the same as bookkeeping.Accounting is a service activity that includes the measurement, recording,summarization, and reporting of economic information to assist financialinformation users to make decisions. Accounting is also described as aninformation system, which measures business activities, processes information into reports and communicates these findings to decision makers. Actually,Accounting covers a broader scope of activities than bookkeeping. Accounting includes the analysis and interpretation of accounting information intended to be used by external and internal decision makers, while bookkeeping only records transactions and events.(2) Financial accounting is the area of accounting aimed at serving external users byproviding them with financial statements. These statements are known asgeneral-purpose financial statements, because external users rely on thesestatements with a broad range of purposes. The activities involved in financial accounting include statement preparation, statement analysis, auditing, accounting regulatory, accounting consulting, accounting planning, and forensic accounting.Managerial accounting is the area of accounting that serves the decision-making needs of internal users. Internal reports are not subject to the same rules asexternal reports and are designed with the special needs of internal users in mind.The activities included are general accounting, cost accounting, budgeting,internal auditing, and management consulting.Question 7。
专业英语作业--Metals
Lesson 1MetalsThe use of metals has always been a key factor in the development of the social systems of man. Of the roughly 100 basic elements of which all matter is composed, about half are classified as metals. The distinction between a metal and a nonmetal is not always clear-cut. The most basic definition centers around the type of bonding existing between the atoms of the element, and around the characteristics of certain of the electrons associated with these atoms. In a more practical way, however, a metal can be defined as an element which has a particular package of properties.Metals are crystalline when in the solid state and, with few exceptions (e.g. mercury), are solid at ambient temperatures. They are good conductors of heat and electricity and are opaque to light. They usually have a comparatively high density. Many metals are ductile-that is, their shape can be changed permanently by the application of a force without breaking. The forces required to cause this deformation and those required to break or fracture a metal are comparatively high, although, the fracture forces is not nearly as high as would be expected from simple consideration of the forces required to tear apart the atoms of the metal.One of the more significant of these characteristics from our point of view is that of crystallinity. A crystalline solid is one in which the constituent atoms are located in a regular three-dimensional array as if they were located at the corners of the squares of a three-dimensional chessboard. The spacing of the atoms in the array is of the same order as the size of the atoms, the actual spacing being a characteristic of the particular metal. The directions of the axes of the array define the orientation of the crystal in space. The metals commonly used in engineering practice are composed of a large number of such crystals, called grains. In the most general case, the crystals of the various grains are randomly oriented in space. The grains are everywhere in intimate contact with one another and joined together on an atomic scale. The region at which they join is known as a grain boundary.An absolutely pure metal (i.e. one composed of only one type of atom) has never been produced. Engineers would not be particularly interested in such a metal even if it were to be produced, because it would be soft and weak. The metals used commercially inevitably contain small amounts of one or more foreign elements, either metallic or nonmetallic. These foreign elements may be detrimental, they may be beneficial, or they may have no influence at all on a particular property. If disadvantageous, the foreign elements tend to be known as impurities. If advantageous, they tend to be known as alloying elements. Alloying elements are commonly added deliberately in substantial amounts in engineering materials. The result is known as an alloy.The distinction between the descriptors “metal” and “alloy” is not clear-cut. The term “metal” may be used to encompass both a commercially pure metal and its alloys. Perhaps it can be said that the more deliberately an alloying addition has been made and the larger the amount of the addition, the more likely it is that the product will specifically be called an alloy. In any event, the chemical composition of a metal or an alloy must be known and controlled within certain limits if consistent performance isto be achieved in service. Thus chemical composition has to be taken into account when developing an understanding of the factors which determine the properties of metals and their alloys.Of the 50 or so metallic elements, only a few are produced and used in large quantities inengineering practice. The most important by far is iron, on which are based the ubiquitous steels and cast irons (basically alloys of iron and carbon). They account for about 98% by weight of all metals produced. Next in importance for structural uses (that is, for structures that are expected to carry loads) are aluminum, copper, nickel, and titanium. Aluminum accounts for about 0.8% by weight of all metals produced, and copper about 0.7%, leaving only 0.5% for all other metals. As might be expected, the remainders are all used in rather special applications. For example, nickel alloys are used principally in corrosion-and heat-resistant applications, while titanium is used extensively in the aerospace industry because its alloys have good combinations of high strength and low density. Both nickel and titanium are used in high-cost, high-quality applications, and, indeed, it is their high cost that tends to restrict their application.We cannot discuss these more esoteric properties here. Suffice it to say that a whole complex of properties in addition to structural strength is required of an alloy before it will be accepted into, and survive in, engineering practice. It may, for example, have to be strong and yet have reasonable corrosion resistance; it may have to be able to be fabricated by a particular process such as deep drawing, machining, or welding; it may have to be readily recyclable; and its cost and availability may be of critical importance.New wordscrystalline adj.晶体的ambient adj.周围环境的opaque adj.不透明的ductile adj.柔软的；易延展的permanently adv.永久地，长期不变地chessboard n.棋盘grain n.晶粒metallic adj.金属的，含金属的detrimental adj.有害的impurities n.杂质consistent adj.一致的ubiquitous adj.普遍的，无处不在的aluminum n.铝esoteric adj.秘传的；限于圈内人的readily adj.容易的Phrase and Expressioncentersaround以…为中心certainoftheelectrons某种电子withfewexceptions极少例外generalcase一般情况下alloyingelement合金元素sufficeittosay只要说…就够了译文：作业一：金属在人类社会的发展中，金属的应用起着关键性的作用。
专业英语作业和答案
一、请将下列英文句子翻译成汉语（1）The recrystallized grain size at the instant of recrystallization is inversely proportional to the degree of deformation .再结晶瞬间的再结晶的晶粒度大小和变形程度成反比。
（2）A mechanism or linkage is a constrained kinematic chain , and is a mechanical device that has the purpose of transferring motion and/or force form a source to an output .机构或连杆是一个约束运动链，并且是一个机械装置，这个装置可以把输入端的运动或是力传输到输出端（3）In the United States material removal is a big business---in excess of $36×109 per year , including material , labor , overhead , and machine-tool shipments , is spent .在美国，机加工是一个很大的市场------每年的花费超过36×109 美元，包括：原材料费用，劳务费用，管理费用，机床运输费用。
（4）The basic tool—work relationship in cutting is adequately described by means of four factors ：tool geometry , cutting speed , feed , and depth of cut .切削加工中，基本的刀具—工件的关系可以从四个方面来描述：刀具的几何外形，切削速度，吃刀量，切削深度。
专业英语作业 3
translation 天津中德职业技术学院专业英语作业
中德学院 12汽营1班 第 1 页 共 1 页 translation
Class 1 xue nan Sun 29 March 22th,2014 practice on class:
most engine blocks are made of cast iron or cast aluminum. each cylinder contains a piston that travels up and down inside the cylinder bore. all the pistons in the engine are connected through individual connecting rods to a common crankshaft.
the crankshaft is located below the cylinders on an in-line
engine,at the base of the V on a V-type engine and between the cylinder banks on a flat engine. As the pistons move up and down, they turn the crankshaft.
翻 译
练习类：
大多数引擎块是由铸铁或铸铝。
每个气缸包含在缸孔内向上和向下活动一个活塞。
在发动机中的所有活塞通过连接杆（即连杆）和曲轴连接在都一起。
曲轴位于一个直列发动机气缸下方，通过V 型的架（连杆）与曲轴相连并且水平排列在发动机内。
当活塞上下移动，带动它们转动曲轴。
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PART1: ReadingHow to quickly read an English paper?Metalworking Glossary Cutting Tool Engineering, November, 2000, 209-238The metalworking glossary defines terms common to those who cut and grind metals and other materials. The terms are divided into 11 categories:1.Manufacturing Definitions;2.Machining Operations;3.Machine Tools and Ancillary Equipment;4.Cutting Tools and Related Terminology5.Coolants, Lubricants, and Related Terminology6.Accessories and Attachments;7.Alloys, Coatings, Material Compositions, and Related Terminology;8.Heat-treating and Special Processes;9.Inspection, Measurement, and Quality Control;10.Robotics and Automated Assembly;11.Nontraditional MachiningHow to Make Use of the Linguistic Features ofScientific Papers(科技论文的语言特点)1.Linguistic Style(语体)科学技术领域，科技工作者的任务：描述自然现象分析自然现象产生的规律研究自然现象应用于人类生产实践的方法表达所取得的成果及其应用思维形式：概念、公式或公式化的概念思维活动的语言表达：按照严格的逻辑程序导出的判断和推理，科技文体具有抽象性、概念性和高度的逻辑性内容：写实语言风格：准确严谨、合乎逻辑，非形象性(理性)、客观性、无明显感情色彩、简洁明快。
Literature1.Conference paper2.Journal paper3.Lecture4.Book (Dissertation or Thesis)5.Report (News)6.Manual and SpecificationPaper and Experimental Report: Title, Abstract, Introduction, Results and Analysis, Conclusion and DiscussionBook & Lecture: Title, Author(s), Name of the process or publisher, Name of the printing House, Name of the distributor, Date of publication, Date of printing, Synopsis, Note by the publisher, International Standard Book Number, Preface or Foreword, Acknowledgements, Contents, Text of the book, Appendix or Supplement, Index, EpilogueManual and Instructions, Directions: Principle, Operation, Maintenance2.VocabularyTypically Professionalized TermsWhenever a force acts on a body so as to make the body move through some distance, it is said to have done work.Body n. 身体, 肉体, 人, 尸体, 主要部分, 团体, 大量vt. 赋以形体机械专业n. 车身,机身船舶专业n. 机身,水团,艇体地质专业n. 体,岩体,车身电力专业n. 物体,本体,壳体法律专业n. 身体,本文,机关纺织专业n. 布身,身骨,物体航海专业n. 全体航空专业n. 机身,船身n. 体,物体化学专业n. 身体,本文,支柱,质地vt. 实现,使...稠化,使...具体化计算机专业体，物体，机壳，机身，底盘，插座体，(正文)体n. 身体(本文,支柱) vt. 实现(使...稠化,使...具体化)建筑专业n. 基础,底盘,基底,体,岩体,车身经贸专业机关n. 全体农牧林专业n. 立木汽车专业n. 车身商务专业机关石油专业n. 体水利专业n. 本体,主体,物体冶金专业n. 主体,机体医学专业n. 躯体,体中医专业n. 身体,肉体,躯体body 在机械工程方面，表示“壳体、机体；车体、车身”等Automobile external parts (汽车外设)front wheel 前轮rear wheel 后轮tread 轮距chassis 底盘bodywork, body 车身rear window 后窗玻璃windscreen 挡风玻璃(美作:windshield) windscreen wiper 风档刮水器,风档雨雪刷(美作:windshield wiper)fender, wing, mudguard 挡泥板radiator grille 水箱wing mirror 后视镜bonnet 发动机盖(美作:hood)boot 行李箱(美作:trunk)roof rack, luggage rack 行李架license plate, number plate 车号牌wing 前翼子板hubcap 轮毂罩bumper 保险杠front blinker 前信号灯taillight, tail lamp 尾灯backup light, reversing light 倒车灯stoplight, stop lamp 刹车灯rear blinker 转弯指示灯trunk, boot 行李箱bumper 保险杠tailpipe 排气管work n. 工作, 劳动, 操作, 职业, [物]功, 手工, 作品, 机件v. (使)工作, (使)运转, 起作用, 造成, 产生, 经营, (使)渐渐移动, 煅制机械专业n. 著作,功船舶专业n. 工作,功n. 劳动地质专业n. 功,工作电力专业n. 功,工作,操作电信专业n. 功,工作法律专业n. 工作,著者,著作,作品,作业v. 劳动航海专业n. 工作航空专业n. 工作,劳动产品n. 工作,运行化学专业n. 工作,劳动,操作,加工,著作,制品vt. 工作,加工,研究,证实,劳动,运行会计专业工件,运转计算机专业工作；功n. 工作(劳动,操作vt. 工作(加工,研究经贸专业工件n. 工作能源专业n. 功,工程农牧林专业n. 工作汽车专业n. 工作,加工,工厂,著作,功,工作商务专业工件石油专业n. 工作n. 功水利专业n. 工作,功,工件冶金专业n. 工作,功医学专业n. 工作,功中医专业n. 工作normal “正常”、“法线”(数学)、“当量”(化学) power “幂”(数学)、“电力，电源”(电学)、“动力”(机械学)Specifically Concentrated Meaning日常英语“动词+副词”，如come off, do for, make up 等，这类短语动词往往不止一种含义，而且常常难以确定，在科技论文中，应用意义比较明确的单个动词来代替，这类动词较“正规”，学术气氛较强，简洁，用起来方便如：absorb take indiscover look attransmit pass onreciprocate move backwards and forwards in a straight line常见动词(effective verbs)：indicate, show, illustrate, demonstrate, review, report, outline, describe, explain, verify, prove, confirm, define, determine, enumerate, compare, contrast, investigate, develop, conclude,Highly Proportional Latin & Greek Words最普通英语单词中，46%直接或间接来源于拉丁语，7.2%来源于希腊语，科技词汇中这个比率会更高。
Analysis, stimulus, focus, automation, formula, antenna, nucleus, radius, symposium, thesis, micro-, hydro-, auto-, multi-, -ion, -graph, -logy, -tudeUsually Used Compound Words由两个或两个以上的词(有时其中用连字符“-”)联合在一起的词称复合词。
使用复合词来表示事物的特征、性质、数量、大小、程度等概念和意义。
一般，复合词的核心是最后一个词。
复合名词emitter region, magnetic field, speedometer, horsepower, blueprint, wavelength, engine noise, higher-than-average复合形容词dust-free, water-proof, three-phase, cross-sectional, biophysical, wire wound, newly-designed, radio-active复合动词white wash, trial-produce, overcharge, self-design, underline, heat treat, short-circuit, electro-plate, induction hardenFrequently Encounter Contracted WordsC( C) = degree of centigrade mech=mechanics radar=radio detecting and rangingLaser=light amplification by stimulated emission of radiationSonar=sound navigation and rangingPixel=picture elemente.g. (例如)，cit. (在上述引文中)，i.e. (就是)，vs. (与...相对)，ibid. (出处相同)，etc. (等等)，ca. (关于)，et al. (等人)，shv. (在该字下)，viz.(即，就是)，vo.(左页，封底)，et seq.(以及下列等等)。