专业英语第五章
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燃油喷射系统燃料喷射系统的车辆上已使用了许多年。
最早的是纯粹的机械。
随着技术的进步,电子燃油喷射系统变得越来越受欢迎。
早期的机械和电控燃油喷射系统不使用反馈控制。
由于排放量成为更多的关注,反馈控制进行了调整,这两种类型的燃油喷射系统。
机械和电子燃油喷射系统,可以发现汽油发动机,柴油发动机是最常见的机械式系统,尽管这些发动机的新一代已经使用电子燃油喷射(EFI.)基本理论EFI使用米燃油输送称为喷油器电磁阀。
今天,大多数车辆使用1缸的喷油器。
当电磁线圈通电时,燃料喷雾到阀口。
由电动泵在约40 psi的高压燃料被输送到喷射器。
燃料输送控制由喷射器是由计算机循环。
计算机产生信号,以打开喷射器用于在一定的时间长度,根据通过传感器传递的发动机状况。
喷射器是打开的时间越长,喷射燃料。
随着发动机负荷和转速的增加,喷油器开启时间的增加,增加气流相匹配。
这台计算机的输出信号被称为喷射器脉冲宽度。
的脉冲宽度的时间越长,喷射燃料。
引擎需求标准火花点火式,4冲程发动机的需要,按照适当的比例混合燃料与进入的空气的高效率运作。
这一比例是13份的范围内的空气中,以1份燃料最佳的电源,15为1为最佳排放量和17〜1最佳经济。
大多数现代发动机旨在为约1,470至1比少将ority巡航和中等功率条件。
这是化学上的正确率,这导致最低的平均排放量和合理的功率。
丰富条件的特点是过量的燃料,精益条件的特点是空气过量或缺乏燃料。
随着转速的增加,在一定程度上,气流也增加和燃油流量必须增加,以配合它。
随着节气门开于一个给定的转速,气流增大到目标点,并再次,燃料流必须遵循气流。
燃油系统电喷燃油系统包括油箱,油泵,油轨,稳压器,喷油器和返回线。
来自燃料罐由泵压力40磅左右。
燃料压力控制由所述燃料压力调节器,燃油轨的一端位于出血回到油箱的燃料通过返回线路。
泵始终把过量的燃料,以便大量返回到坦克在怠速和低转速条件下,发动机需求的增加。
燃油轨本质上是一个管状燃料歧管设计进行燃料喷射器和进气歧管上,举行的地方。
Unit 5 Fourteen steps1、n.a warning or criticism about sb’s behaviour2、v.cause severe suffering3、v.help4、n.a sudden bursting of a tire5、v.quickly push sth or sb .into sth.6、n.sb.who is unable to use his limbs,esp.the legs7、n.a stick under one’s arm ,for supporting a person who has difficulty in walking8、v.refuse to accept that sth.might be true or important9、n.a road for vehicles that connects a private house10、n.the quality of being very great,esp.in difficulty11、a.weak and poor in health12、a.feeling impatient or angry because you are unable to do what you want to do13、v.move the fingers in an attempt to do sth14、n.a fact or event that canbe used for judging sb.or sth.15、a.characterized by or blowing in strong rushes of wind16、v.walk with difficulty17、v.make the horn of a vehicle produced a short loud sound18、ck of interest,love,etc.19、v.set up.20、n.a period of time between activities21、v.pull suddenly and quickly22、v.be so full that the contents go over the sides ;be very full23、v.cause to be unable to move24、v.enter ,pass (into or through)25、n.someone who people believe has been sent by God to teach them the right way to follow their religion26、a.from or relating to the Bible27、v.become slower or less active28、v.(esp.of wind)come hard down and cross29、a.smooth and slippery.30、a.extremely tired31、v.move quickly and smoothly(all over)32、v.move forcefully or with a heavy deadened sound33、v.cause to slope34、pletely35、pron.whatever36、n.sth.that you compare similar thing to as a way of judging their quality or value。
Unit 5 Hydraulic Structures水工建筑物Open Channel Flow明渠流We may divide open channel flow into steady and unsteady flow. Steady refers to time. If the discharge in a channel at any one point does not change with time, we are dealing with steady flow. If it does change with time, we have unsteady flow, for instance, when a wave is traveling in a channel or when the discharge is gradual.我们可以把明渠流分为恒定流和非恒定流。
恒定是指时间。
如果渠道中任意一点的流量不随时间变化,我们认为是恒定流。
如果它随着时间的改变而改变,我们认为是非恒定流,例如,当波浪在渠道中传播或当流量渐进变化时。
We may divide open channel flow also into uniform and non-uniform flow. Uniform refers to distance. If the wetted cross-sectional area of an open channel is the same from one location to another, we are dealing with uniform flow. If it does change from place to place, we have non-uniform flow; for instance, when the slope of the channel steeps, when the channel contains an obstruction, or when the flow is backed up by a dam.我们也可以把明渠流分为均匀流和非均匀流。
Chapter 5Bidding and Tendering of Construction Projects建设项目投标和招标5.1 Bidding Procedure of Construction Projects建设项目投标过程第一段:第一句:The implementing agencies of borrowing countries can use a variety of procurement methods on World Bank-financed projects〔世界银行资助项目〕.借款国的执行机构可以使用世界银行资助项目的各种采购方法。
第二句:The method selected depends on a number of factors including [〔the type of goods or services being procured〕, 〔the value of the goods or services being procured〕, 〔the potential interest of foreign bidders〕and 〔even the cost of the procurement process itself〕].选择的方法取决于多项因素,包括所采购的商品或服务的类型;采购的商品或服务的价值;外国投标者的潜在利益;甚至采购过程本身的成本。
第三句:The overall objective of the guidelines〔指南〕how to select procurement methods is to allow borrowing countries to buy high quality goods and services as economically as possible 〔尽可能经济〕.指南中如何选择采购方式的总体目标是让借款国在尽可能经济的条件下购买优质的产品和服务。
Most people can formulate a mental picture of a computer, but computers do so many things and come in such a variety of shapes and sizes that it might seem difficult to distill their common characteristics into an all-purpose definition. At its core, a computer is a device that accepts input, processes data, stores data, and produces output, all according to a series of stored instructions.Computer input is whatever is put into a computer system. Input can be supplied by a person, by the environment, or by another computer。
Examples of the kinds of input that a computer can accept include the words and symbols in a document, numbers for a calculation, pictures, temperatures from a thermostat,audio signals from a microphone, and instructions from a computer program. An input device, such as a keyboard or mouse, gathers input and transforms it into a series of electronic signals for the computer.In the context of computing, data refers to the symbols that represent facts, objects, and ideas. Computers manipulate data in many ways, and we call this manipulation processing。
昆明学院《专业英语》课程教学大纲(适用电气专业)(共 32 学时)一、课程的性质、地位、任务和教学目标(一)课程的性质和地位专业英语是电气工程及其自动化的通识教育公共必修课程之一,随着国际交流的日益广泛,专业英语的重要性也日渐明显。
本课程是专业基础教育的一门选修课。
本课程既是专业知识的学习又是英语的学习,具有双重意义。
(二)课程的主要任务课程的主要任务从以下三个方面体现:1. 专业词汇领会掌握250-300个本专业单词,以及由这些词构成的常用词组200-250个,并具有按构词语法识别生词的能力。
2. 阅读翻译能力借助工具书,能流利阅读本专业的英文书籍及相关资料,并有一定的翻译能力。
3. 英文摘要写作与学术交流能力具有初步的英文摘要写作与学术交流能力。
教学重点:1.掌握教材中出现过的专业英语词汇;2.掌握专业英语的阅读技巧;3.掌握专业英语的翻译技巧;4.掌握专业英语的语法特点;5.掌握专业英语和科技英语中的常见文体,尤其是学术论文的写作知识。
教学难点:1.专业英语词汇的积累;2.专业英语的正确应用。
(三)课程的教学目标本课程目标是使学生了解专业英语的基本特点,并学习相应的专业词汇,提高学生应用英语的能力。
学生通过本课程的学习,能够了解专业英语的特点,可以拓展自己的专业词汇,能基本无障碍的阅读本专业英文文献,具备一定翻译本专业英文文献和和写作本专业英文科技论文的基础,并有一定的学术交流能力,为将来从事专业工作打下必要的基础。
二、课程教学环节组成由课堂讲授,师生讨论,习题课,答疑,复习等环节组成。
三、课程教学内容纲要第一章:Fundamentals of Electric Circuits【目的和要求】掌握课文及专业英文的语法特点和词汇特点。
【教学内容】1.1 Current and Voltage1.2 Circuit Elements1.3 Ohm’s Law1.4 Kirchhoff’s Laws1.5 Basic Analysis Methods1.6 Sinusoidal AC Circuit Analysis and Three-Phase Circuit【重点和难点】1)The relation between power and energy2)Independent sources3)How to use Kirchhoff’s current law and voltage law?4)Nodal analysis5)Balanced three-phase Voltage第二章:Electronics【目的和要求】掌握课文及词义选择、词义的引申和长难句的翻译。