通信与信息工程专业英语教程美电子教案lesson

1、2022/9/14通信与信息工程专业英语教程1Lesson 10 Electromagnetic Wave Propagation BackgroundsText tour Language in useVocabulary Structure Reading/writing techniques2022/9/14通信与信息工程专业英语教程2TerminologyTransponder 卫星转发器 Infrared 红外线Ultraviolet 紫外线的index of refraction 折射率 Diffract 衍射 Backgrounds2022/9/14通信与信息工程专业英语教程3T

2、erminologyPolarization 偏振,极化VHF abbr. Very High Frequency 甚高频UHF abbr. UltraHigh Frequency 超高频Backgrounds2022/9/14通信与信息工程专业英语教程4TerminologyTroposphere 对流层ionosphere 电离层dielectric constant 介电常数， 电容率 ion density 离子密度Backgrounds2022/9/14通信与信息工程专业英语教程5Text tour Outline Introduction optical properties of

3、 radio waves terrestrial propagation of electromagnetic waves 2022/9/14通信与信息工程专业英语教程6The polarization of a electromagnetic wave linear polarization horizontal polarization vertical polarization circular polarization elliptical polarization free space or Earths atmosphere is often used as a transmiss

4、ion medium Introduction 2022/9/14通信与信息工程专业英语教程7Free-space propagation of electromagnetic waves is often called radio frequency (RF) propagation or simply radio propagation. Radio waves are electromagnetic waves and like light.Introduction 2022/9/14通信与信息工程专业英语教程8Refraction ReflectionDiffraction Inter

5、ferenceoptical properties of radio waves2022/9/14通信与信息工程专业英语教程9Ground-Wave PropagationSpace-Wave Propagation Sky-Wave Propagationterrestrial propagation of electromagnetic waves2022/9/14通信与信息工程专业英语教程10terrestrial propagation of electromagnetic wavesNormal modes of wave propagation2022/9/14通信与信息工程专业英

6、语教程11Vocabulary Orientation , Perpendicular , Interference , Penetrate , Conductivity , vibrate StructureReading/writing techniquesLanguage in use2022/9/14通信与信息工程专业英语教程12Vocabulary2022/9/14通信与信息工程专业英语教程13Orientation in dictionaryThe act of orienting or the state of being oriented. 向东定向的行为或被定向的状态Loca

7、tion or position relative to the points of the compass. 定向与罗盘所指相关的地点或位置The construction of a church so that its longitudinal axis is from west to east and its main altar is at the eastern end. 圣坛位于东端一种纬轴由西向东、主圣坛在最东端的教堂建筑结构The direction followed in the course of a trend, movement, or development. 趋向尾

8、随着一系列趋势、运动或发展的方向2022/9/14通信与信息工程专业英语教程14Orientation in dictionaryA tendency of thought; a general inclination: 倾向思考问题的倾向；普遍的趋向：An adjustment or adaptation to a new environment, situation, custom, or set of ideas. 适应对新的环境、状况、习俗或一系列思想的适应或者接受Introductory instruction concerning a new situation: 介绍针对新形势的

9、介绍性指导：Awareness of the objective world in relation to ones self. 定位（力）对与自身相关的物质世界的关心 2022/9/14通信与信息工程专业英语教程15Orientation in textThe polarization of a plane electromagnetic wave is simply the orientation of the electric field vector in respect to the surface of the Earth (i.e., looking at the horizon

10、). 平面电磁波的极化是指相对于地球表面（从水平线看）的电场矢量方向。 2022/9/14通信与信息工程专业英语教程16Orientation in use orientation for ing students.向新同学进行介绍absolute orientation绝对定向, 对地定向action orientation面向行动alternate orientation选用方位angular orientation角(定)向, 角取向axial orientation沿轴取向; 轴向方位2022/9/14通信与信息工程专业英语教程17Orientation in use radio-ra

11、nge orientation无线电导航定向法relative orientation相对方位screw orientation螺旋取向space orientation空间定向star compass orientation星象罗盘定向2022/9/14通信与信息工程专业英语教程18Orientation in use straight molecular orientation分子单向排列 vertical orientation垂直定向orientation of recorded signals记录录象信号定向orientation of related features关连形体间的方

12、向, 方向公差2022/9/14通信与信息工程专业英语教程19Perpendicular in dictionaryIntersecting at or forming right angles. 成直角的，垂直的交叉成直角的，或形成直角的Being at right angles to the horizontal; vertical. 竖直的，垂直的与水平呈直角的；垂直的Often Perpendicular Of or relating to a style of English Gothic architecture of the 14th and 15th centuries, ch

13、aracterized by emphasis of the vertical element.常作 Perpendicular 哥特式的：与14和15世纪英国哥特式建筑风格的，或与之有关的，以强调垂直部分为特点2022/9/14通信与信息工程专业英语教程20Perpendicular in dictionaryA line or plane perpendicular to a given line or plane. 正交线（面）一条或一个与给定直线或平面垂直的直线或平面A perpendicular position.垂直的位置A device, such as a plumb line

14、, used in marking the vertical from a given point. 垂规，铅垂线一种装置，如铅垂线，用于从给定点标记竖直方向A vertical or nearly vertical line or plane. 垂直线，垂直面垂直或近似垂直的线或平面2022/9/14通信与信息工程专业英语教程21Perpendicular in textIf the electric field is propagating perpendicular to the Earths surface, the wave is said to be vertically pola

15、rized.若电场垂直于地面传播，这种波称为垂直极化波。 2022/9/14通信与信息工程专业英语教程22Perpendicular in usedraw a line perpendicular to a given line作一直线与已知直线垂直The plumbline is always perpendicular to the horizontal plane.铅垂线总是垂直于水平面的。The wall is out of the perpendicular.这墙有些倾斜。2022/9/14通信与信息工程专业英语教程23Interference in dictionaryThe ac

16、t or an instance of hindering, obstructing, or impeding.妨碍Something that hinders, obstructs, or impedes.障碍物The variation of wave amplitude that occurs when waves of the same or nearly the same frequency come together.干扰The inhibition or prevention of clear reception of broadcast signals.干扰The distor

17、ted portion of a received signal.干扰信号2022/9/14通信与信息工程专业英语教程24Interference in dictionaryOn a communications link, noise or unwanted signals that impair the receipt or correct interpretation of speech or data.A term used to describe an operating characteristic of many systems. Since both the processor

18、 and the channels require storage cycles for references from main storage, and only one access from storage can be made in any given storage cycle, the processor and the channels must time-share main storage. This contention for storage cycles is termed interference. The interference characteristics

19、 of a channel or channels are a measure of the input/output computer overlapping capability of a computer system.2022/9/14通信与信息工程专业英语教程25Interference in textIn Earths atmosphere, ray-wavefront propagation may be altered from free-space behavior by optical effects such as refraction, reflection, diff

20、raction, and interference.在地球大气中，由于折射，反射，衍射，干涉这些光效应的存在，使光在自由空间的传输方式发生了改变。2022/9/14通信与信息工程专业英语教程26Interference in use adjacent-channel interference邻信道干扰atmospheric interference天电干扰 audio interference声频信号干扰back door interference后门干扰background interference背景干扰beat interference拍频干扰biprism interference双棱

21、镜干涉2022/9/14通信与信息工程专业英语教程27Interference in use broad band interference宽带干扰broadcast interference广播干扰colour subcarrier interference彩色副载波干扰common mode interference共模干扰continuous wave interference连续波干扰crosstalk interference交叉干扰, 串话干扰electromagetic interference电磁干扰2022/9/14通信与信息工程专业英语教程28Interference in

22、 use harmonic interference谐波干扰hum interference交流声干扰image frequency interference像频干扰intermodulation interference互调干扰intersymbol interference符号间干扰, 码间干扰inverse mixture interference倒向混频干扰line interference线路干扰2022/9/14通信与信息工程专业英语教程29Interference in use mirror interference镜象干扰multipath interference多径干扰ne

23、ar-by interference近区干扰near-end interference近端干扰noise interference噪声干扰; 杂波干扰power line interference电力线干扰power-supply interference电源干扰2022/9/14通信与信息工程专业英语教程30Interference in use radio interference射电干扰, 无线电干扰snow interference“雪花”干扰2022/9/14通信与信息工程专业英语教程31Penetrate in dictionaryTo enter or force a way i

24、nto; pierce. 穿过，刺入，穿透进入或迫使进入；刺入To enter into and permeate: 渗入进入或渗透：To cause to be permeated or diffused; steep. 浸，泡使被渗透或扩散；湿透To enter (an organization, for example), usually surreptitiously, so as to gain influence or information; infiltrate. 打入，秘密潜入进入（例如，一个组织）以便获取事实或信息；秘密潜入2022/9/14通信与信息工程专业英语教程32P

25、enetrate in dictionaryTo enter and gain a share of (a market):进入（市场）或取得（市场）分额 ：To grasp the inner significance of; understand. 洞悉，明了掌握其内在重要性；理解To see through: 看穿，看透透过看见：To affect deeply, as by piercing the consciousness or emotions. 感染，深深感动通过唤起意识或情感而打动人心 2022/9/14通信与信息工程专业英语教程33Penetrate in dictiona

26、ryTo pierce or enter into something; make a way in or through something. 穿透，穿过刺入或进入某物；进入或穿过某物To gain admittance or access. 进入，渗入得到准入权或获准进入To gain insight. 洞悉获得洞察力2022/9/14通信与信息工程专业英语教程34Penetrate in textThe waves that do not penetrate the second medium are reflected. 没有穿透第二层介质的光则被反射了。2022/9/14通信与信息工

27、程专业英语教程35Penetrate in use be penetrated with discontent深为不满penetrate the phenomena of things to study their essence透过事物现象研究其本质penetrate the mystery of揭示.的秘密The rain penetrated (through) our clothes.雨水湿透了我们的衣服。2022/9/14通信与信息工程专业英语教程36Penetrate in use A smell of gunpowder penetrated the woods.森林中弥漫着火药

28、味。Western ideas penetrate slowly through the East.西方观念逐渐传入东方。2022/9/14通信与信息工程专业英语教程37Conductivity in dictionaryThe ability or power to conduct or transmit heat, electricity, or sound. 传导性传导热、电、或声音的能力或能量The conductance of a material.材料的传导性The conductibility of a structure, especially the ability of a

29、 nerve to transmit a wave of excitation. 传导性组织的传导性，尤指神经对兴奋的传导能力2022/9/14通信与信息工程专业英语教程38Conductivity in textThis is because the electric field in a horizontally polarized wave would be parallel to Earths surface, and such waves would be short-circuited by the conductivity of the ground.因为水平极化波的电场平行于地

30、表面,这些波将被地面的导体短路掉. 2022/9/14通信与信息工程专业英语教程39Conductivity in use acoustical conductivity声导率， 传声性air conductivity空气电导率； 大气导电性asymmetrical conductivity不对称导电性atomic conductivity原子传导率characteristic conductivity特性电导率2022/9/14通信与信息工程专业英语教程40Conductivity in use dielectric conductivity介质电导direct-current conduc

31、tivity直流导电率earth conductivity大地电导率electrical conductivity电导率electrolytic conductivity电解电导率equivalent conductivity等效电导率2022/9/14通信与信息工程专业英语教程41Conductivity in use heat metal conductivity金属的导热性hole conductivity空穴电导率radiation conductivity辐射传导induced conductivity感应导电性ionic conductivity离子电导性率magnetic conductivity磁导率， 导磁性2022/9/14通信与信息工程专业英语教程42vibrate in dictionaryTo move back and forth or to and f