电力学院专业英语课程微波PPT

合集下载

电子专业英语lesson18-Microwave Ovens

[rʌb] 搓，摩擦
vibrate[vai'breit] 振动，摇摆
['mɔlikju:l] 分子，微粒；摩尔
• If you use fire to heat something, it starts to get hot from the outside and it takes some time before the inside gets hot. • But because microwave ovens use the power of microwaves, they can start cooking food from the inside right away.
• Let’s take a look inside a microwave oven. ['mæ ɡnitrɔn] • That is what is called a magnetron. 磁控管 • This device makes the microwaves that heat and cook your food.
• If food was warmed up like that, there would be parts that are hot and some that are cold, so the food wouldn’t taste too good. • How do you get the microwaves to hit all parts of the food evenly?
• Most food contains water. • When microwaves hit molecules of water, the molecules start vibrating really fast, which makes the water molecules hit each other and rub against each other. 摩擦热 • Heat caused by rubbing is called “frictional heat” and this is what starts cooking the food.

电气专业英语基础 ppt课件

ppt课件
8
常用的前缀和后缀却多达百个，可见派生法的构词能力是非常强的。作为一个专业技术人员，至少应掌握50个常用前缀和后缀。
前缀（prefix）：词义变化，词类不变后缀（suffix）：词义可能变化可能不变，词类一定会变
ppt课件
9
名词前缀
前缀 auto-
含义自动，自己，自身
counterhydr(o)
专业或技术词汇某个专业所特有的词汇，其专业性强，词义狭窄和单一。
diode ，
(二极管)
capacitor ，
（电容器）
substation ,
(变电站，变电所)
autotransformer，（自耦变压器）
superconductivity (超导特性)。
ppt课件
4
次技术词汇
很多专业和学科所共有的词汇,不同专业和学科往往具有不同词义 power : 幂，乘方动力，功率，效率
名词+形容词(n+adj.) →adj.： ice-cold, network-wide 名词+副词(n+adv.)→n.，adj.: feedback
形容词＋名词（adj+n）→n.，adj.：
low-pass, high-speed, short-circuit, newtype
形容词+名词+ed (adj.+n.+ed)→adj.:
隶属于科技英语是科技英语的一部分，以表达科技概念、理论与事实为主要目的。遵守科技英语的语法体系和翻译方法;特别注重客观事实和真理，表达准确、精练和正式。
是结合各自专业的科技英语有很强的专业性，涉及的面更加狭窄，与专业内容配合更为密切。

电力系统专业英语培训资料

电力系统专业英语精品文档发电机generator电压 voltage 母线bus 铁损 iro n loss 有功损耗active loss高压侧high side 低压 low voltage 稳定 stability 电厂 power pla nt 直流DC 开关站 switch station 并列的apposable三相故障 three phase fault 高顶值 high limited value 机端电压控制 AVR 功角 power angle 电抗器Reactor 功率因数 power-factor 功角 power-angle 无功负载 reactive load 电抗 reacta nee 上限 upper limit 负序阻抗 negative sequenee impedanee 功率因数power factor 额定rat ing 电压互感器PT 下降率droop rate 受端 receive-side 摇摆swing 刀闸（隔离开关）Isolator 励磁 excitati on 电流 curre nt 变压器 transformer 铜损 copper loss 无功损耗reactive loss 输电线 transmission line 中压 middle voltage 电压稳定 voltage stability 能量输送 power transfer 电网 powersystem 调节 regulati on 裕度margin分接头tap 静态 static（state ）电抗 reacta nee 有功（功率）active power断路器Breaker 定子 stator 电压等级 voltage grade 档位 tap position 电导eonductanee 下限 lower limit 零序阻抗 zero sequenee impedanee 无功电流 reactive current 变比ratio 分接头tap 传递函数 transfer function 同步 synchronization 阻尼 damping 机端 gen erator term inal变电站 transformer substation 给永磁同步电机 Perma nen t-mag net Syn chro nism Motor电力系统 power system 励磁器excitor 升压变压器 step-up tra nsformer 空载损耗no-load loss 空载电流 no-load current 输电系统 power transmission system 高压 high voltage 功角稳定 angle stability 暂态稳定 transient stability 交流AC 落点 drop point 高抗 high voltage shunt （逃避）reactor 故障fault 切机 generator triping 动态 dynamic （state ）电阻 resista nee 电容器Capacitor 电动机 motor 阻抗 impedanee 有功负载:active load PLoad 电阻 resistor 电纟内 susceptanee 正序阻抗 positive sequenee impedanee 无功（功率）reactive power斜率slope 参考值 referenee value 仿真分析 simulation analysis 框图 block diagram 保护断路器circuit breaker 无刷直流电机 Brusless DC motor异步电机 Asynchronous Motor三绕组变压器 three-colum n tran sformer ThrCI nTrans 双绕组变压器 double-colum n tra nsformer DbICIm nTrans 固定串联电容补偿 fixed series capacitor compe nsati on双回同杆并架 double-circuit lines on the same tower 单机无穷大系统 one machi ne - infinity bus system补偿度 degree of compensation 失去同步 loss of synchronization无功补偿 reactive power compensation 极限切除时间 critical clearing time 并联电容器 shunt capacitor< 线路补偿器 LDC(li ne drop compe nsatio n)自动控制理论 Automatic Con trol Theory 微机原理 Principle of Microcomputer 电路原理 Principle of circuits电力电子基础Basic fun dame ntalsof power electr onics高电压工程High voltage engin eeri ng励磁电流 Magnetizing current 电磁场:Electromagnetic fields 装机容量 in stalled capacity 故障切除时间 fault cleari ng time 强行励磁 rein forced excitati on 下降特性 droop characteristics电机学 Electrical Machinery 电磁场 Electromagnetic Field 电工学 Electrotechnics 电机学 Electrical Machinery电力系统稳态分析 State An alysis of Power System电力系统暂态分析Power System电力系统继电保护原理 Electrical System's Relay Protectio n电力系统元件保护原理Prin ciple of Power System 's Element 电力系统内部过电压 Voltage within Power system模拟电子技术基础 An alogue Electr onic Tech ni que数字电子技术 Tech ni que电路原理实验 of pri nciple of circuits电气工程讲 Steady-Tran sie nt-State An alysis ofPrin ciple ofProtectio nPastBasis ofDigital ElectricalLab.Lectures on电子专题实践Topics on experime ntal project of electr onics电气工程概论In troducti on to electrical engin eeri ng电子电机集成系统Electro nic machi ne system 电力传动与控制Electrical Drive andCon trol电力系统继电保护Power System Relayi ng Protectio n主变压器mai n tran sformer升压变压器step-up tran sformer降压变压器step-dow n tran sformer工作变压器operating transformer备用变压器sta ndby tran sformer公用变压器com mon tra nsformer三相变压器three-phase tran sformer单相变压器sin gle-phase tra nsformeron-load regulati ng 带负荷调压变压器tran sformer变压器铁芯tra nsformer core变压器线圈tra nsformer coil变压器绕组tra nsformer winding变压器油箱tra nsformer oil tank变压器外壳tra nsformer cas ing变压器风扇tra nsformer fantra nsformer oil 变压器油枕con servator( s drum变压器额定电压tra nsformer rated voltage变压器额定电流tra nsformer rated curre nttra nsformer voltage 变压器调压范围regulati on rage配电设备power distribution equipment SF6断路器SF6 circuit breaker开关switch按钮butt on隔离开关isolator,disc onn ector真空开关vacuum switch刀闸开关kn ife-switch接地刀闸earthing knife-switch电气设备electrical equipme nt变流器curre nt con verter电流互感器curre nt tran sformer电压互感器voltage tra nsformer电源power source交流电源AC power source直流电源DC power source工作电源operati ng source备用电源Stan dby source强电str ong curre nt弱电weak curre nt继电器relay信号继电器sig nal relay电流继电器curre nt relay电压继电器voltage relay跳闸继电器tripp ing relay合闸继电器clos ing relay中间继电器in termediate relay时间继电器time relay零序电压继电器zero-seque nee voltage relay 差动继电器differe ntial relay闭锁装置lock ing device遥控telec on trol遥信telesig nalisatio n遥测telemeteri ng遥调teleregulati on断路器breaker,circuit breaker少油断路器min i-oil breaker,oil-min i-mumbreaker高频滤波器high-freque ncy filter组合滤波器combined filter常开触点no rmally ope ned con tact 常闭触点no rmally closed con tact 并联电容parallel capacita nee保护接地protective earth ing熔断器电缆跳闸脉冲合闸脉冲一次电压二次电压并联电容器无功补偿器消弧线圈母线三角接法星形接法原理图一次系统图二次系统图两相短路三相短路单相接地短路device短路电流计算自动重合闸高频保护距离保护横差保护circuit curre nt纵差保护线路保护过电压保护母差保护瓦斯保护变压器保护电动机保护远方控制用电量载波故障选择性速动性灵敏性protectionprotectioncutout,fusible cutout cabletripp ing pulse clos ing pulseprimary voltage sec on daryvoltage parallel capacitorreactive power compe nsation arc-suppress ing coilBus,busbar delta conn ecti onWye conn ecti on schematicdiagram primary systemdiagram sec on dary systemdiagram two-phase shortcircuit three-phase shortcircuit sin gle-phase grou ndshort calculati on of shortcircuit automatic reclos inghigh-freqe ncy protecti ondista nee protecti on transverse differe ntial lon gitudinal differe ntial line protectionover-voltage protecti on busdiffere ntial protecti onBuchholtz protecti on transformer protecti on motorprotecti on remote con trolpower con sumpti on carrierfaultselectivityspeedsen sitivity可靠性reliability电磁型继电器electromag netic无时限电流速断保护in sta ntan eously over-curre nt protection跳闸线圈trip coil工作线圈operati ng coil制动线圈retra int coil主保护mai n protecti on后备保护back-up protecti on定时限过电流保护definite time over-current protection三段式电流保护the curre nt protecti on with threestages反时限过电流保护in verse time over-curre nt protecti on方向性电流保护the directi onal curre nt protecti on零序电流保护zero-seque nee curre nt protecti on阻抗impedanee微机保护Microprocessor Protectio n。

实用电力英语培训课程PPT课件( 30页)

HUI REN @ NCEPU
45-15
Run advanced software using real-time information from power plants and substations.
Do fault diagnosis and identification.
• they are not replaceable by each other, and they are complementary to each other.
27.05.2019
HUI REN @ NCEPU
45-9
• Pure science has been subdivided into the physical science, which deals with the facts and relations of the physical world, and the biological science, which investigate the history and working of life on this planet.
Regional level 地调 County level 县调
27.05.2019
HUI REN @ NCEPU
45-13
National wide grid dispatching Inter-regional connection above 500 Kv
500 Kv substation 500(330)Kv transmission lines 220 Kv key substation 220 Kv transmission lines
220 Kv substation 110Kv, 35 Kv substation 110Kv transmission lines and below

电力专业英语基础.ppt

(1)技术，先进设备直接进入电站、电厂等电力生产第一
线；
专业英语表达、听说、应变能力
电力技术的飞速发展，国际间学术交流与合作不断加强；
电力工业的迅速发展，急需一大批既懂专业，又懂英语的现代
化电力科技人才。在自己的专业领域实际运用好英语：
掌握一定的专业英语词汇、阅读技巧；能用英语了解电力的生产过程；熟悉电力工业常见的英语文献等
③国际学术会议专业英语表达、听说、应变能力
二、本教材的特点
内容选材面广，编写循序渐进，
涉及：电工基础、电子技术、电力电子技术、电机学、计算机、电力系统、继电保护、发电厂和自动化等内容
内容编排模块化
第一章：介绍专业英语的特点，有关的特殊语法现象和基本句型；
第二章：22个单元，每单元包括三篇阅读材料和一篇使用英语摘录
,
autotransformer （自耦变压器） superconductivity (超导特性) 。
(变电站，变电所) ，
次技术词汇 sub-technical words 很多专业和学科所共有的词汇,不同专业和学科往往具有不同词义
power : 幂，乘方动力，功率，效率电源，电力，功率，电能
dep —department
缩略词：由词组中某些词的词头字母（有时多于一个）所组成，作为一个词按照正常的规则发音
ROM —read only memory 只读存储器 RAM —random access memory 随机（存取）储存器 Radar —radio detecting and ranging ；雷达 GIS —gas insulated station 气体绝缘变电站
(2) 学习方面
①考研考博的需要。专业英语阅读能力

电子专业英语partPPT课件

important elements in electronic circuitry, it is essential
to know something about resistance, capacitance and
inductance.
第12页/共64页
一、电阻器及电阻
I
电阻器：它是一个二端元件 resisAtorersistotrwiso-atetwrmo-itnearml einlealment
二极管 diode
应用：通信工业如收音机、电视等
application : communication industry, radio, television
In 1906 Deforest made the first triode in the United States. The widespread applications of vacuum tubes during that time period were in the communications industry, first in radio and later in television. The use of vacuum tubes declined rapidly when a semiconductor device was invented that could perform many of the functions previously associated with vacuum tubes.
第13页/共64页
电阻的概念：对电流的阻力为电阻。单位符号为Ω。
resistance
1Ω的定义：当加在导体上的电压为1V时，将导体的电

微波课件.ppt

三.圆波导中的三个主要波型 1.H11波(n=i=1)
讨论: ① 场结构
磁力线电力线
②.单模问题单模传输的条件：2.62a<λ<3.41a 存在极化简并：水平极化和垂直极化
磁力线电力线
由于H11模存在极化简并，所以没有完全实现波导的单模传输。
水平极化和垂直极化是两种不同的模式，传输特性完全一致，不可能通过波导尺寸的选择除去其中一个。在传输过程中，遇到不均匀性时，两个模式不再简并，会使场结构的极化面产生旋转
[1] 电子经过的地方有足够强的电场,且电场方向与电子运动方向一致.这样,电场才能对电子起加速或减速的作用,从而交换能量.
[2] 腔中电子穿过的作用间隙要小,以保证足够小的渡越时间
根据以上要求,在微波管中采用的谐振腔有一个很小的作用间隙,在其中集中了相当长的电场.满足以上要求的谐振腔为环型谐振腔
根据安培环路定理有:
磁力线
注意:电力线与磁力线同相位电力线
1.定义:电流强度
3.根据特性阻抗的定义: 4.平均功率损耗: 6.内导体单位长度上的损耗
同轴线中也存在高次模式可以证明截止波长最大的色散模式为H11,且有:
目前采用特性阻抗为75Ω和50Ω的两种同轴传输线,前者决定于衰减最小,后者兼顾通过功率大与衰减小的两个要求折中.
③波阻抗和特性阻抗
波导内为空气时的衰减系数（导体衰减）：
2. E01波 ①场表达式
②场结构
电力线磁力线
场的特点:
① 轴对称性
② r=0 附近仅有z向的电场分量，这一特点可有效的同轴向运动的电子交换能量——电子直线加速器。
③ 壁电流仅有z向分量
3. H01波 n=0, i= 1 代入H波的场分量表达式:

part3 电力专业英语课件

2011-6-1
不论如何，不论如何，不管怎样以防（某种情况），以防（某种情况）， In case(经常跟从句）如果 In any case Take warm clothes in case the weather 带上保暖衣， is cold. 带上保暖衣，以防天气变冷 In case 后不跟从句，表示“以防什么情况” 后不跟从句，表示“以防什么情况” It may not rain , but you had better take umbrella in case.
可能不会下雨，但你最好带上雨伞（可能不会下雨，但你最好带上雨伞（以防下雨）
2011-6-1
In case of In no case
如果，如果，万一
在任何情况下都不（在任何情况下都不（该短语位于句首时，于句首时，主句要使用部分倒装） In no case are you to leave you post.
2011-6-1
浇灌系统，灌溉系统， Irrigation system 浇灌系统，灌溉系统，排放系统
irrigator
n. 灌溉车，冲洗设备灌溉车，苏醒，总计，苏醒，总计，涉及
come to
…..之前来在上，之前来， come before 在…..之前来，在上，被提出，位于 come under 编入，归入，遭受编入，归入， come Morning 晨曦，试听晨曦， come away 离开，脱离，离开，脱离，脱落
only 位于句首修饰状语要倒装. 位于句首修饰状语要倒装. only in this way can you learn english well
2011-6-1
在句首的only如果后面跟了副词、介词如果后面跟了副词、在句首的如果后面跟了副词状语，短语或从句等状语短语或从句等状语，则主句用倒装结构主语， .如only后跟的是主语，就不用倒装结如后跟的是主语构了. 构了 only the teachers are allowed to use the room．(不倒装）不倒装）．不倒装 only then did he realize the importance of English.（倒装）（倒装）注意，注意，only和所修饰的状语如果不在和所修饰的状语如果不在句首，则不倒装. 句首，则不倒装

Mw-1.微波课件].ppt

(1.2.11a)
U l I l Z 0 j (t z ) U l I l Z 0 j (t z ) U ( z, t ) e e 2 2 U l I l Z 0 j (t z ) U l I l Z 0 j (t z ) (1.2.11b) I ( z, t ) e e 2Z 0 2Z 0
2 2 L1C , j 无耗传输线的传播常数; L1C1 ) 无耗传输线的相移常数;
Z0 L1 无耗传输线的特性阻抗. C1
(1.2 11) (1.2 12)
如果给定边界条件:在末端负载处,即
Ul z 0,U (0) U l , I (0) I l , Z l . Il
应用欧拉公式： e jz cos z j sin z
e jz cos z j sin z
(2).特解(三角函数的形式)：
(1.2.11)可以写成
U ( z ) U l cos z jIl Z 0 sin z I ( z ) j U l sin z I cos z l Z0
(1.2.1)
z 0
u ( z, t ) i ( z, t ) L1 z t
(1.2.3)
由基尔霍夫定律（电流定律：节点电流为零）有
u ( z, t ) i ( z z, t ) C1z i( z, t ) 0 t
z 0 i ( z , t ) u ( z , t ) C1 z t
(m) 10
8
3 10 10
5
3
3 10 10
2
6
3 10 10
-1
9
3 10 10
-4

微波知识培训PPT课件

*
ODU
7~38G ODU
*
系统设备组成
编号
名称
说明
1
GND
接地柱
2
RSSI
收信信号强度指示（直流电压），供调整天线时参考
3
IF
中频接口， N(Female),用中频电缆与IDU连接
4
射频接口
波导接口，用于7GHz ～ 23GHz频段，直接与天线连接。
*
接口介绍说明
♦N 型连接器（阴头）中频接口用于ODU 到IDU 的连接，为IDU 提供140MHz 中频信号。从I DU接收-48VDC 和350MHz 发信中频和OOK信号（发送5.5M，接收10.7M）。 ♦ 调整天线的测试端口(BNC 接口) 利用RSSI 端口，对接收信号的功率进行监测，按照输出的直流电压于接收信号功率的对应关系进行天线对准。 ♦射频接口在ODU 的射频出口处安装了圆形的法兰适配器，便于ODU 与天线的连接。 ♦ 接地柱使用接地螺丝进行接地保护。
0.6m天线和ODU(直接安装, 1+0)
微波设备由室内单元 (IDU)、室外单元 (ODU)、网管系统、同轴电缆和天线组成
*
一跳系统之间的通信
*
IDU的作用
IDU主要把业务数据、辅助数据、网管及交换数据按一定数据格式复接成帧，传给调制解调模块，调制解调模块再完成基带调制解调、中频变频等功能。
*
在大城市和市区，在建设数字节点和分配网络时，数字微波常常是可以与光缆相比的唯一的可供选择的方案。事实上，除了在大城市和小城镇内埋设地下电缆费用非常昂贵外，在闹市区开挖管道常常是很难得到批准的。这种情况在欧美发达国家表现尤为突出。据称，在欧美发达国家用于移动覆盖的传输中大约80％－90％采用数字微波系统。在世界上许多国家中，微波接力链路可能是可以穿越数千里林区、山区、大草原、沙漠、沼泽地和其他困难地域的唯一可用的大容量传输媒质。而且，由于功率消耗相当低，应用太阳能电源已经成为在这种条件严酷的地区应用数字微波接力系统的一个重要因素。由于微波电路不易人为破坏，不易受自然灾害的影响，因此微波系统是组成我国通信网的不可缺少的组成部分，是保证通信网安全所不可缺少的。

微波工程第三版英文原版pptch10

Figure 10-18 (p. 507)
Third-order intercept point for a cascaded system. (a) Two cascaded networks. (b) Equivalent network.
Microwave Engineering, 3rd Edition by David M. Pozar Copyright © 2004 John Wiley & Sons
Figure 10-13 (p. 501)
A general nonlinear device or network.
Microwave Engineering, 3rd Edition by David M. Pozar Copyright © 2004 John Wiley & Sons
Figure 10-14 (p. 503)
Figure 10-7 (p. 493)
Determining the noise figure of a noisy network.
Microwave Engineering, 3rd Edition by David M. Pozar Copyright © 2004 John Wiley & Sons
Definition of the 1 dB compression point for a nonlinear amplifier.
Microwave Engineering, 3rd Edition by David M. Pozar Copyright © 2004 John Wiley & Sons
ห้องสมุดไป่ตู้
Figure 10-19 (p. 508)

大学电气专业-专业英语课件-9

CNC abbr. Computerized Numerical Control 计算机数值控制 stand for v.代表, 代替, 象征 introduce [,intrə'dju:s]vt. 传入, 引进, 提出 walk of life n. 行业，职业；地位 touch [tʌʧ] n. 触, 触觉, 接触vt. 接触, 触摸, 触及, 达到 vi. 触摸, 接近, 涉及, 提到 manufacturing [,mænjə'fækʧəriŋ]n. 制造业 adj. 制造业的 drill press n. 钻床 chuck [ʧʌk] n.扔, 抛弃vt. 用卡盘夹住 spindle ['spindl]n. 主轴，心轴，轴, 杆 pulley [‘puli] n. 滑车, 滑轮 Axes n. 轴 Accessory n. 附件, 零件, 附加物 adj. 附属的,补充的,副的 feedrate ['fi:d reit] n. 馈送率, 进料速率 Overly adv.过度地，太，非常 interpreting [in'tə:pri:tiŋ]adj. 作为说明的, 解释的
As you can easily see, there is a lot of manual intervention required to use a drill press to drill holes. A person is required to do something almost every step along the way! While this manual intervention may be acceptable for manufacturing companies if a small number of holes or workpieces must be machined, as quantities grow, so does the likelihood for fatigue due to the tediousness of the operation. And do note that we’ve used one of the simplest machining operations (drilling) for our example. There are more complicated machining operations that would require a much higher skill level (and increase the potential for mistakes resulting in scrap workpieces) of the person running the conventional machine tool. (We commonly refer to the style of machine that CNC is replacing as the conventional machine.)可以容易地看出，用钻床钻孔过程中需要许多的人工干涉。在整个加工过程中几乎每一步都需要人工参与！虽然加工少量的孔或工件，制造公司可以接受人工干涉，但随着数量增加，沉闷的操作可能导致厌烦。并且注意，我们已经用一个最简单机械操作（钻孔）作为一个例子。有许多复杂的机械操作，使用传统的机械工具，需要操作人员具有很高的技巧（并且增加了出错而带来废品的可能）。（我们一般是指已经由CNC取代了传统机械）。

电类专业英语教学课件ppt作者汪建宇03a（41-103）P63wxd

第3章阅读与翻译Text1Preventive MaintenanceNew Words And Expressions adjustment n.调整，调节；校正approach n.方法consistent adj.一致的；前后一贯的，稳定的device n.装置，设备，器件expectancy n.预期，期望inspection n.检查，检验lubricant n.润滑油maintain vt.维护；保持malfunction n.故障，失灵predetermined adj.预定的，推定的preventive adj.预防的；防止的；防护的susceptibility n.敏感性，灵敏度thought-out adj.周密的；周到的vital n.至关重要的wear vt.磨损，损耗suit the need(s)of适合……需要up to由……决定in regard to考虑到break in合用，进入正常阶段wear out磨损，损耗preventive maintenance经常性维护保养periodic checkup定期检查wear factor磨损/损耗因素42end product成品life expectancy预期寿命part replacement零部件更换ExercisesⅠ.Mark the following statements with T(true)or F (false)according to the passage.1.The purpose of preventive maintenance is to suit the needs of production.2.Different printers follow the same standards set for“the best possible condition”of their equipment.3.The more valuable equipment must be considered first in a well thought-out program.4.Regular inspection is not an important concern to the proper maintenance program.5.Like older people need more checkups,old machinery needs frequent inspections.6.The more respect shown for the equipment,the more satisfactory the end product will be.7.With regular machine adjustments,part replacement will increase.8.Regular inspections of machine adjustment will lead to cost saving.Ⅱ.Give brief answers to the following questions.1.Do people give the same time and effort to all machinery when they work out their maintenance program?2.How do people handle the equipment,which is more sensitive to losing adjustments in their maintenance program?3.How many areas of concern are there in a preventive maintenance program,and what are they?434.What part does inspection play in a maintenance program?5.Does a clean machine give the feeling of producing a high-quality product?6.How do some organizations determine the effective life of a part?Ⅲ.Match the items listed in the following two columns.1.malfunction a.state of being affected or of some specifiedtreatment2.facility b.a substance,as oil or grease,for lessening friction3.susceptibility c.occurring or appearing at regular intervals4.lubricant d.adaptation to a particular condition5.inspection e.the state or quality of anticipating the life of amechanical part6.periodic f.rigid exactness or accuracy7.adjustment g.serving to prevent or hinder8.preventive h.careful or critical examination9.expectancy i.something designed,built or installed to serve aspecific function10.severity j.failure to perform properlyⅣ.Fill in the table below by giving the corresponding translation.English ChineseLubrication schedule经常进行维修保养operator experience磨损因素end product44预期寿命part replacement耐磨损性periodic checkup设备失灵（故障）Ⅴ.Complete the following sentences by translating the Chinese given in the brackets.1.This program of preventive maintenance（尚未适应生产需要）.（suit）2.It is（厂家设备是否处在最佳状态）.（up to）3.（关于印刷设备的经常性维修保养），the company decided to hire an experienced operator to perform lubrication.（in regard to）4.More attention must be given to the new machinery（直到新机器开始工作）.（break in）5.The end product is expected to be acceptable（基于对机器故障的定期检查）.（on the basis of）6.A good organization knows the effective life of a part and（就在它磨损掉之前更换）.（wear out）45Text2AmplifierNew Words And Expressionsamplifier n.放大器active device有源器件impedance n.阻抗，电阻抗biasing n.加偏压，偏置，偏压load n.负载ratio n.比值，比率logarithmic adj.对数的decibel n.分贝quiescent adj.安静的；不活动的combination n.组合megahertz n.兆赫present n.存在conduct vt.导通modified adj.改良的，改进的sufficient adj.足够的，充分的exceed vt.超过，胜过；超出parallel adj.平行的multi-stage n.多级configuration n.配置emitter n.发射器complementary adj.互补的stable adj.稳定的，不变的screen n.幕，荧光屏cascade n.串联，级连feedback n.回授，反馈，反应stabilize vt.稳定，安定pproximately adv.近似地，大约response n.作答，回答；响应46monolithic adj.单片的，单块distortion n.畸变，歪曲，弄歪，失真symmetrical adj.对称的，匀称的non-inverting n.同相sink vi.下沉；消沉接收器resistance n.电阻，抵抗；抵制；抵抗力minimize vt.使减到最小harmonics n.谐频，谐波parameter n.参（变）数；参量ExercisesⅠ.Mark the following statements with T(true)or F (false)according to the passage.1.An amplifier is a circuit that provides gain.It receives a low-power input and generates a larger amount of power at the output without an external supply.2.An amplifier arrangement consists of some active device with biasing components,a source of power,and a load.3.In the class A amplifier,the value of bias current is either increased or decreased about its mean value by the input signal.mon emitter amplifier usually called“emitter follower”.V oltage gain just less than unity,high input impedance and low output impedance.5.The amplifiers employ negative feedback to stabilize the gain against variations in device parameters,power supply,and temperature, and to modify input and output impedance.6.Negative feedback reduces internal generated noise and gives wider bandwidth.7.A symmetrical power supply is only positive power supply.8.Distortion may occur in an amplifier as a result of non-linearity.Ⅱ.Give brief answers to the following questions.1.What are the basic functions of the amplifier?472.Why it is more convenient to express gain in logarithmic units decibel then expressions of gains as ratios?3.According to the means of the biasing arrangement and the position of the quiescent operating point,how many operation methods of amplifiers have?4.What are the amplifier configurations by using the bipolar transistor?5.What are the reasons that the amplifiers employ negative feedback?6.What is the main difference between the class A and the class B amplifier?7.What is the main reason of the distortion in an amplifier?8.What is the use of heat sink in the TDA2020IC?Ⅲ.Match the items listed in the following two columns.1.amplifier a.to change or improve something make it moreacceptable2.modify b.the return back into a system of part of what itproduces3.configuration c.firmly fixed or not likely to move or change4.stable d.an electrical device which makes sounds louder5.feedback e.the particular arrangement or pattern of a groupof related things6.distortion f.an increase in something such as size,weight oramount7.resistance g.a set of facts or a fixed limit which establishes orlimits how something can or must happen or be48done8.parameter i.the degree to which a substance prevents theflow of an electric current through it:9.gain j.in an electrical system,an electrical devicewhich takes power,or the electrical power putinto the system10.load k.the change something from its usual,original,naturalⅣ.Fill in the table below by giving the corresponding translation.Ⅴ.Complete the following sentences by translating the Chinese given in the brackets.1.The particular advantage offered by bipolar transistor amplifier is（小的输入电压可以产生较大的电压输出）.（produce）2.In the common emitter amplifier,（发射结正偏，集电结反偏）.（bias）3.The majority amplifiers employ negative feedback（用49于抵消元件参数的改变稳定放大倍数）.（stabilize）4.In the class B transistor amplifier,the transistor（只在信号半周导通，在另半周截止）.5.The amplitude distortion（是由于放大电路的非线性引起的）.（cause）50Text3Operational AmplifierNew Words And Expressionsfraction n.小部分；片断；分数millivolt n.毫伏transfer characteristic转移特性，传输特性saturate vt.使饱和offset n.偏移量potentiometer n.电位计，分压计trim out整理，修整null adj.无效力的，无效的，等于零的constant-current source恒流源complementary adj.互补的；互相补足的straightforward adj.正直的，坦率的，简单的，直接了当的drift n.漂流物，漂移diffuse vt.&vi.使（热）散开tolerance resistors容差电阻ExercisesⅠ.Mark the following statements with T(true)or F (false)according to the passage.1.the op-amp must be provided with both a positive and negative power supply2.The open loop voltage gain A vol is typically1000dB.3.The open loop voltage gain A vol is a small differential input is required to cause a small output change.4.if the inverting input is held at zero volts and the non-inverting input level made+0.1mV,then the output will go positive to nearly +10V.5.With any DC coupled amplifier the drift of the output signal mustbe kept to a high value.6.Drift is defined as any change in output voltage when the input is short-circuit or otherwise held at zero.7.Two of the major causes of drift are temperature changes causing the V BE of transistors to alter by about–2mV per℃,and power supply voltage changes.8.The voltage follower has only50%negative feedback.Ⅱ.Give brief answers to the following questions.1.what is an op-amp?2.Are the two input terminals of an op-amp the non-inverting input marked+,and the inverting input marked–.?3.what’s the typical transfer characteristic of an op-amp?4.How must the op-amp be so that the output can swing circling zero?5.what are two of the major reasons of the drift?6.what is the great advantage of the differential arrangement?Ⅲ.Match the items listed in the following two columns.1.Fraction a.An instrument for measuring an unknownvoltage by comparison to a standard voltage.2.saturate b.Forming or serving as a complement;3.offset c.One that amplifies,enlarges,or extends.4.potentiometer d.a very small piece or amount5.null e.Something that lessens or absorbs the shock ofan impact.plementary f.to fill completely7.Drift g.Having no legal force or invalid8.amplifier h.Of,relating to,situated at,or forming a limit,aboundary,an extremity,or an end.9.buffer.i.To be carried along by currents of air or water10.terminal j.to make up for or balanceⅣFill in the table below by giving the corresponding translation.English Chinesedifferential amplifier分压计transfer characteristicfeedback loop缓冲器loop voltage输入线路short-circuit闭环inverting amplifierⅤ.Complete the following sentences by translating the Chinese given in the brackets.1.Amplifiers.（对不同的电压作出反映）（…respond...to...）2.,（我们在实际生活中测量电压时）a potentiometer always occurs some“offset”.（…in practice…）3.By using a differential input stage,（两个晶体管平衡地连接在了一起）.（…be collected together…）4.In this experience,（同级信号应用到了两个输入端）.（…be applied to…）5.At this time a fraction of the output signal（…be fed back…）.（反馈到了倒相输入端）6.The output is connected back directly to the inverting input，（…in other words…）（换句话说输出端紧联着输入端）．Text4The Logic GateNew Words And Expressionsdiscrete adj.分立的，不连续的complementary adj.补充的，补足的，互补的multiplexer n.多路（复用）器，数据选择器respectively adv.各自地，分别地random logic随机逻辑mainstay n.支柱，中流砥柱integrated injection logic集成注入试逻辑电路Schottky肖特基势垒器件fan-in扇入系数，输入端数noise immunity抗干扰度，抗噪声性power consumption电力消耗，功率消耗ambient temperatures adj.周围的n.周围环境stray capacitance寄生电容，杂散电容exponentially adv.指数地，幂数地dissipation n.消散，分散，耗散，耗费propagation delay传输延迟时间，传送延迟enhancement n.提高，增强static adj.静的，静态的，静电fan-out输出，输出端数ExercisesⅠ.Mark the following statements with T(true)or F (false)according to the passage.1.Discrete component logic is nowadays very common.2.Emitter-coupled logic is available for very fast applications.3.Transistor-transistor logic(TTL)and complementary metal oxide semiconductor(COMS)families provide both small-scale integrated(SSI)devices and medium-scale integrated(MSI)devices.4.Some LSI devices employ other forms of logic that are used for the simpler circuits.5.The standard TTL logic,known as the54/74series,has a poor noise immunity and a rather high power consumption.6.The74series designed for commercial applicants and can operate at ambient temperatures of up to90℃.7.The complementary metal-oxide semiconductor or COMS logic family offers the desirable features of very low power dissipation and good noise8.Very often protective diodes are connected between the input terminals and earth to increase the possibility of the device being damaged by static charges produced by handling.Ⅱ.Give brief answers to the following questions.1.what’s the most popular logic families?2.what does The terms SSI and MSI refer to?3.why does the great popularity of this logic family arise?4.Some LSI devices employ other forms of logic that are not used for the simpler circuits.What are they?5.Does the54series primarily intend to military application?6.what does the complementary metal-oxide semiconductor or COMS logic family offer?Ⅲ.Match the items listed in the following two columns.1.discrete a.The act of dissipating or the condition of havingbeen dissipated.2.multiplexer b.Having no motion;being at rest;quiescent.3.mainstay c.Surrounding;encircling4.dissipation d.A small electronic device containing a semicon-ductor and having at least three electrical contacts,used in a circuit as an amplifier,a detector,or aswitch.5.enhancement e.Constituting a separate thing;distinct6.static f.The condition of being full of or beyond satis-faction;satiety.7.transistor g.Of,relating to,or designating a storage systemof data-processing computers in which it ispossible to store instructions or quantities inmore than one position.8.ambient h.A two-terminal semiconductor device used chie-fly as a rectifier.9.saturation i.The process of improving a computer systemby adding or replacing elements.10.diode j.A chief supportⅣ.Fill in the table below by giving the corresponding translation.English Chinese monolithic integrated circuit晶体管逻辑emitter-coupled logic微处理器output impedancecollector-emitter输出器电压protective diodesmetal-oxide semiconductor逻辑状态Ⅴ.Complete the following sentences by translating the Chinese given in the brackets.1.we talked about two subjects（前一例子是晶体管逻辑，后一例子是连接发射器逻辑）.（…the former and…the latter…）2.the use of large-scale integration devices.（已经导致了对随意逻辑更少地使用）.（…lead…to…）3.The logic family offers fairly high speed,（另外，它既经济又易于获取各种资源）．（…in a ddition…）4.The standard TTL logic,,has a poor noise immunity and a rather high power consumption.（是人们所熟知的54/74级数）（…known…as…）5.If the base current is large enough,（它会驱动T2进入饱和状态）．（…drive…into…）6.In integrated circuit,.（有的电路是串联，有的是并联）．（…in series…in parallel…）Text5Modern Control SystemNew Words And Expressionsanalogy n.类似，类推，模拟digital adj.数字的，数位的，手指的n.数字，数字式steering n.操纵，掌舵，指导hydraulic adj.水力的，水压的tactile adj.触觉的，有触觉的，能触知的n.触觉型actuator n.制动器，传动装置：制动器。

大学电气专业-专业英语课件

• Have the courage to change can change things, have a mind to accept the things that cannot be changed, have the wisdom to distinguish the difference.
况且，人这一辈子，若到头来都认不清自己、未能长成最好最真实的自己，还有什么意义呢?
You have to trust that the dots will somehow connect in your future. You have to trust in something--your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life.
你要相信，生活中的偶然冥冥中也能指引未来。你要心怀信念——相信你的直觉、命运、生活抑或因缘。这个方法一直给我力量，促使我过得卓然不同。
• The only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle.
• 用你的梦想和理想引领你的一生，要用感恩、真诚、助人圆梦的心。引领你的一生，要用执着、无畏、乐观的态度引领你的一生。如果你做到了这些，因缘会给你一切你所应得的。
而且，只有了解真实的自己方能成就大事。你需要了解那个真实的你，而不是你的品牌、名誉、LinkedIn资料、你的过去抑或他人对你的看法。

微波课件1-56

Z(z)Z(z)z(z)r(z)jx (z) Z0
Z(z) 1(z) 1(z)
(z) u j v
2．复平面上的归一化阻抗圆
r jx1(u jv) 1(u jv)
1(u2 v2) j
2v
(1u)2 v2 (1u)2 v2
r 1 (u 2 v 2 )
(1 u ) 2 v 2
x
2v
(1 u ) 2 v 2
抗
ZL 0.76j0.4
负载阻抗 Z L Z L Z 0 ( 0 .7 j6 0 .4 ) 5 ( 3 0 j8 2 ) 0 ) (
§1.6 阻抗匹配 1. 6. 1 阻抗匹配的概念阻抗匹配包含两方面的含义：微波源的匹配：解决的问题是如何从微波源中取出最大功率。要求信号源内阻与传输线输入阻抗实现共轭匹配。负载的匹配：解决的问题是如何使负载吸收全部入射功率。要求负载与传输线实现无反射匹配。
（a）四分之一波长抗变换器只能对纯电阻负载进行匹配。
（b）变换器上仍存在着驻波。
变换器上驻波的驻波系数为
（书上有错！） Z01 Z0RL
' RL Z 01
(RL Z 01 )
' RL
或
Z0
'' Z 01 RL
(RL Z 01 )
（2）复阻抗匹配
'' Z 0 RL
（a）终端接 / 4 阻抗变换器
ZLZL180 j240 0.6j0.8 Z0 300
在阻抗圆图对应A点。
2）确定终端反射系数的模
通过A点的等反射系数圆与右半段纯电阻线交于B点。 B点归一化电阻（r=3）等于驻波比值，因此反射系数模等于
L 1133 110.5

电力专业英语第十二讲PPT课件

f the conductor is wound into a coil of many turns of wire, the magnetic fields around the individual turns are added together to form a single, concentrated field around the coil.
Operation
Operation of a transformer is based on the fundamental characteristics of ac electrical energy. A series of causes and effects are involved, as follows:
lamination [ˌlæmɪ'neɪʃən] n. 层压，
hollow [ˈhɒləʊ] a.
; 空腹的;
pancake [ˈpænkeɪk]n. 薄饼 vt.
使平坠著陆; 使平展;
strip [strɪp]n. 去，剥去; 剥夺
; 带状地带vi. 剥光; 表演脱衣舞; 剥除;vt. 除
If the conductor is wound into a coil of many turns of wire如果导体被绕成一个多匝的线圈
the magnetic fields around the individual turns are added together to form a single, concentrated field around the coil. 单匝绕线周围的磁场被叠加在一起形成一个在线圈周围的集中磁场。
be equal to
squared-off figure 8 8 squared正方形的；带有方格图案的;

大学电路专业英语教学课件

2.characteristic [ˌkæriktəˈristik]
3.Ohm [əum] 4.Faraday [ˈfærədi,-dei] 5.integral [ˈintiɡrəl] 6.equation有的，表示特性的 n. 特征，性能，特色，特性，特点 n. 欧姆(电阻单位)
1.resistor [riˈzistə]
n. n. n.
(=resister) 电阻，电阻器，流阻器电容，电容器
2.capacitor [kəˈpæsitə] 3.inductor [inˈdʌktə]
4.transistor [trænˈzistə]
5.bias [ˈbaiəs] 6.electrode [iˈlektrəud] 7.semiconductor [ˈsemikənˈdʌktə] 8.amplifier [ˈæmpliˌfaiə]
4.p-type
5.forward bias 6.reverse bias 7.bipolar transistor
p型(半导体)
正向偏置反向偏置双极(性)晶体管
8.field effect transistor
9.Integrated Circuit 10.equivalent circuit
电感，电感线圈，感应器，引导者 n. 晶体(三极)管，半导体(三极)管，晶体管(半导体)收音机 n. 斜线；偏见，偏向；偏压，偏置 Vt. 使有偏见；使有倾向性；加偏压到 n. 电极 n. n. 半导体
9.fabricate [ˈfæbrikeit]
10.germanium [dʒə:ˈmeiniəm]
P1 Fundamental of Electric
（3）电感电感是由绕成线圈形状的导线组成（图1.3）。当电流通过线圈时，在线圈周围将产生磁场，它将阻止电流强度的快速变化。像电容一样，电感可以被用于分辨信号变化的快慢。当电感和电容连在一起使用时，电感上的电压在一个确定的频率上达到最大值。这一原理用在无线接收机上，通过调节可变电容可以选择一个特定的频率。（4）晶体管晶体管由半导体制成。半导体是硅和锗这样的材料，经过搀杂（即加入微量的外部元素），使内部的自由电子过剩或者不足。前一种类型的半导体叫n型半导体，后一种类型的半导体叫p型半导体。将n型半导体和p型半导体结合在一起就形成了二极管（图1.4a）。当这个二极管连接上电池，使p型材料为正，n型材料为负时，因为 p区缺少电子，电子就会被电池的负极排斥而毫无阻止地进入p区。当电池反接时，要到达p区的电子经过n区非常困难，因为n区已经填充了大量自由电子，电流几乎为零。1948年发明了双极的晶体管（图 1.4b），它由三层搀杂材料组成，两个p-n结可以配置成p-n-p或n-p-n 型晶体管，其中一个p-n结连接上电池使其有电流通过（正向偏置），另一个p-n结以相反的方向连接上电池（反向偏置）。如果用一个外加信号使晶体管的正偏p-n结中的电流发生变化，反偏p-n结中的电流将相应地跟着变化。这个原理可以用来构建放大器，正向偏置p-n结的小信号可以引起反向偏置p-n结中电流大的变化。