《電子信息類專業(yè)英語》課件-第15章

Unit15TemperatureSensors英文簡歷的書寫(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℃.

英文簡歷的書寫(一)

英文簡歷是進入外企的“敲門磚”它可能決定求職者能否進入下一輪的面試，能否有真正展露自己才華的機會。因此了解有關(guān)的常識和程式，成功的機會必將大大增加。英文簡歷并沒有固定的模版，關(guān)鍵是要在簡歷中讓面試者了解你，發(fā)現(xiàn)你的特點，證明你的能力。一般一份完整的英文簡歷可包括以下幾個方面的基本內(nèi)容。

1.個人情況：(PersonnelInformation)

Name姓名Sex性別DateofBirth出生年月

PlaceofBirth出生地Nationality國籍

MartialStatus婚姻狀況 Religion宗教信仰

Health健康狀況Height身高

Weight體重E-mailAddress電子郵件地址

Tel電話PresentAddress通信地址

其中地址與電話這兩項一定要預(yù)留清楚，為下次面試做準備。

2.職業(yè)意向:Objective/orPositionWanted:

例如：

(1)?Apositionasanelectronicdesignengineer

電子設(shè)計工程師的職位

(2)?AresponsibleadministrativepositionwhichwillprovidechallengeandfreedomwhereIcanbringmyinitiativeandcreativityintofullplay.

負責(zé)管理的職位，該職位將提供挑戰(zhàn)和自由，使我能充分發(fā)揮我的進取精神及創(chuàng)造能力。

(3)Anexecutiveassistantpositionutilizinginterests,trainingandexperienceinofficeadministration.

行政助理的職位，可利用自己的興趣、培訓(xùn)技能與經(jīng)驗進行辦公室管理工作。

(4)?Anentry-levelpositioninsales.Eventualgoal:managerofmarketingdepartment.

銷售方面的初級職位。最終目標：銷售部門的經(jīng)理。

3.資歷(Qualifications)

例如：

Diplomaofelectronicinformationengineering,majoringincommunication.

電子信息工程類的大專文憑，通信專業(yè)。

4.主修課程(CoursesRelated)

CommunicationPrinciple通信原理

MobileCommunicationTechniques移動通信技術(shù)

InformationTheoryandCoding信息理論與編碼

DigitalSignalProcessing數(shù)字信號處理

CalculatorNetworkPrinciple計算機網(wǎng)絡(luò)原理

EDA電子設(shè)計自動化

TheComprehensiveElectronicsSystemDesign綜合電路設(shè)計

這里可寫些與招聘職位相關(guān)的主要課程。

5.工作經(jīng)歷(JobExperience)

工作經(jīng)歷一般逆序?qū)憽＠纾?/p>

7/2007-9/2007AninternofSimensFactoryAutomationEngineeringLtd.

西門子自動化工程有限公司實習(xí)生

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

在廣州假日酒店當(dāng)公關(guān)小姐。暑期全職。

6.喜好與特長(HobbyandSpecialSkills)

7.社會活動(SocialActivity)

MemberoftheTenthStudentCommitteeofBeijingInternationalStudiesUniversityin2007

2007年北京第二外國語學(xué)院第十次學(xué)生代表大會代表

CampusStudent-operatedCommunityServiceOrganizerfrom2004to2005

2004年—2005年,擔(dān)任校社團聯(lián)盟策劃部干事。

CampusSportsDepofBeijingInternationalStudiesUniversityfrom2004to2005

2004年—2005年，北京第二外國語學(xué)院擔(dān)任校體育部干事

8.榮譽與獎勵(HonorsandAwards)

例如：

BeElecteda“ThreeGoods”Studentin2007.

2007年度被評為“三好”學(xué)生。

WonthetitleofExcellentLeaderoftheUniversityStudentCouncilin2007.

2007年榮獲校學(xué)生會優(yōu)秀干部稱號。

GottheScholarshipfromthecollegein2004.

2004年獲校級獎學(xué)金。

WonthetitleofExcellentLe