《电子信息类专业英语》课件-第15章

Unit15TemperatureSensors英文简历的书写(一)

Oneoftheprimarymethodsforelectricalmeasurementoftemperatureinvolveschangesintheelectricalresistanceofcertainmaterials.Inthis,aswellasothercases,theprinciplemeasurementtechniqueistoplacethetemperature-sensingdeviceincontactwiththeenvironmentwhosetemperatureistobemeasured.Thesensingdevicethentakesonthetemperatureoftheenvironment.Thusameasureofitsresistanceindicatesthetemperatureofthedeviceandtheenvironmentmustwaituntilthedevicecomesintothermalequilibriumwiththeenvironment.

ThetwobasicdevicesusedastheResistance-TemperatureDetector(RTD),basedonthevariationofmetalresistancewithtemperature,andthethermistor,basedonthevariationofsemiconductorresistancewithtemperature.

Thereexistsanotherdependenceofelectricalbehaviorofmaterialsontemperaturethatformsthebasisofalargepercentageofalltemperaturemeasurement.Thiseffectischaracterizedbyavoltage-generatingsensorinwhichanelectromotiveforce(emf)isproducedthatisproportionaltotemperature.Suchanemfisfoundtobealmostlinearwithtemperatureandveryrepeatableforconstantmaterials.Devicesthatmeasuretemperatureonthebasisofthisthermoelectricprinciplearecalledthermocouples(TCs).

Herewe’llbrieflydiscussthecharacteristicsofResistance-TemperatureDetector(RTD).

AResistance-TemperatureDetector(RTD)isatemperaturesensorthatisbasedontheprinciplesthatmetalresistanceincreasingwithtemperature.Metalusedinthesedevicesvaryfromplatinum,whichisveryrepeatable,quitesensitive,andveryexpensive,tonickel,whichisnotquitsasrepeatable,moresensitive,andlessexpensive.

SensitivityAnestimateofRTDsensitivitycanbenotedfromtypicalvaluesofα0,thelinearfractionalchangeinresistancewithtemperature.Forplatinum,thisnumberistypicallyontheorderof0.004/℃,andfornickelatypicalvalueis0.005/℃.Thus,withplatinum,forexample,achangeofonly0.4Ωwouldbeexpectedfora100ΩRTDifthetemperatureischangedby1℃.Usually,aspecificationwillprovidecalibrationinformationeitherasagraphofresistanceversustemperatureorasatableofvaluesfromwhichthesensitivitycanbedetermined.Forthesamematerials,however,thisnumberisrelativelyconstantbecauseitisafunctionofresistivity.

ResponseTimeIngeneral,RTDhasaresponsetimeof0.5to5sormore.Theslownessofresponseisdueprincipallytotheslownessofthermalconductivityinbringingthedeviceintothermalequilibriumwithitsenvironment.

ConstructionARTD,ofcourse,issimplyalengthofwirewhoseresistanceistobemonitoredasafunctionoftemperature.Theconstructionistypicallysuchthatthewireiswoundonaform(inacoil)toachievesmallsizeandimprovethermalconductivitytodecreaseresponsetime.Inmanycases,thecoilisprotectivetubethatinevitablyincreasesresponsetimebutmaybenecessaryinhostileenvironments.Alooselyappliedstandardsetstheresistanceatmultiplesof100Ωforatemperatureof0℃.

RangeTheeffectiverangeofRTDsdependsprincipallyonthetypeofwireusedastheactiveelement.Thus,atypicalplatinumRTDmayhavearangeof — 100℃to650℃,whereasaRTDconstructedfromnickelmighttypicallyhaveaspecifiedrangeof — 180℃to300℃.

英文简历的书写(一)

英文简历是进入外企的“敲门砖”它可能决定求职者能否进入下一轮的面试，能否有真正展露自己才华的机会。因此了解有关的常识和程式，成功的机会必将大大增加。英文简历并没有固定的模版，关键是要在简历中让面试者了解你，发现你的特点，证明你的能力。一般一份完整的英文简历可包括以下几个方面的基本内容。

1.个人情况：(PersonnelInformation)

Name姓名Sex性别DateofBirth出生年月

PlaceofBirth出生地Nationality国籍

MartialStatus婚姻状况 Religion宗教信仰

Health健康状况Height身高

Weight体重E-mailAddress电子邮件地址

Tel电话PresentAddress通信地址

其中地址与电话这两项一定要预留清楚，为下次面试做准备。

2.职业意向:Objective/orPositionWanted:

例如：

(1) Apositionasanelectronicdesignengineer

电子设计工程师的职位

(2) AresponsibleadministrativepositionwhichwillprovidechallengeandfreedomwhereIcanbringmyinitiativeandcreativityintofullplay.

负责管理的职位，该职位将提供挑战和自由，使我能充分发挥我的进取精神及创造能力。

(3)Anexecutiveassistantpositionutilizinginterests,trainingandexperienceinofficeadministration.

行政助理的职位，可利用自己的兴趣、培训技能与经验进行办公室管理工作。

(4) Anentry-levelpositioninsales.Eventualgoal:managerofmarketingdepartment.

销售方面的初级职位。最终目标：销售部门的经理。

3.资历(Qualifications)

例如：

Diplomaofelectronicinformationengineering,majoringincommunication.

电子信息工程类的大专文凭，通信专业。

4.主修课程(CoursesRelated)

CommunicationPrinciple通信原理

MobileCommunicationTechniques移动通信技术

InformationTheoryandCoding信息理论与编码

DigitalSignalProcessing数字信号处理

CalculatorNetworkPrinciple计算机网络原理

EDA电子设计自动化

TheComprehensiveElectronicsSystemDesign综合电路设计

这里可写些与招聘职位相关的主要课程。

5.工作经历(JobExperience)

工作经历一般逆序写。例如：

7/2007-9/2007AninternofSimensFactoryAutomationEngineeringLtd.

西门子自动化工程有限公司实习生

7/2006-9/2006PublicrelationsgirlatGuangzhouHolidayInn.Full-timeinsummers,

在广州假日酒店当公关小姐。暑期全职。

6.喜好与特长(HobbyandSpecialSkills)

7.社会活动(SocialActivity)

MemberoftheTenthStudentCommitteeofBeijingInternationalStudiesUniversityin2007

2007年北京第二外国语学院第十次学生代表大会代表

CampusStudent-operatedCommunityServiceOrganizerfrom2004to2005

2004年—2005年,担任校社团联盟策划部干事。

CampusSportsDepofBeijingInternationalStudiesUniversityfrom2004to2005

2004年—2005年，北京第二外国语学院担任校体育部干事

8.荣誉与奖励(HonorsandAwards)

例如：

BeElecteda“ThreeGoods”Studentin2007.

2007年度被评为“三好”学生。

WonthetitleofExcellentLeaderoftheUniversityStudentCouncilin2007.

2007年荣获校学生会优秀干部称号。

GottheScholarshipfromthecollegein2004.

2004年获校级奖学金。

WonthetitleofExcellentLe