文献翻译——考试中手机屏蔽设备的电磁辐射预测系统研究

0外文文献资料StudyonExamElectromagneticRadiationPredictionSystemofMobilePhoneShieldingDevices1.AbstractNowadays,manylargeexaminationsneedtousemobilephoneshieldingdevices.Manystudentsandparentsfeelconcernabouttheelectromagneticradiationeffectofmobilephoneshieldingdevices.Thispaperconsidersthecomprehensiveeffectofmobilephonefromtheelectromagneticradiationintensity,themainradiationdirectionandthedistancewiththeradiationsource.Thispaperdesignstheexamelectromagneticradiationpredictionsystemofmobilephoneshieldingdevices.Bycomparingthecalculatingresultsofpredictionsystemwiththerealmeasuringresults,theeffectivenessofthepredictionsystemcanbeverified.TheelectromagneticradiationeffectofmobilephoneshieldingdevicesisanalyzedquantitativelyaccordingtotheChinaelectromagneticradiationstandard.Thepaperprovidesthesafeusingdistanceofmobilephoneshieldingdevicesintheend.Thequantitativestudyofthispaperhasthedefiniteguidesignificanceaimingtothemobilephoneshieldingdevicessuse.2.INTRODUCTIONThemobilephoneshieldingdevice(sometimesreferredtoasmobilephoneblockdeviceormobilephonepurifierormobilephoneinterferencedevice),itwasprimelyusedinsomespecialdepartment(e.g.thearmyorthesecurity).Inrecentyears,themobilephoneshieldingdevicehasbeenwidelyusedinthemeetingroom,examinationroom,library,cinema,odeum,hospital,courtandchurch.Nowadays,manylargeexaminations(e.g.collegeentranceexamination,postgraduateentranceexamination)needtousemobilephoneshieldingdevices.ThisapproachcausesManystudentsandtheirparentsofstrongopposition,italsoleadstoconsiderablecontroversyinthecommunity.Thesupporterswhoagreeusingthemobilephoneshieldingdevicethinkitcaneffectivelypreventandeliminatestudentscheatingbyusingamobilephone.Theopposers(includingtheinventerofthemobilephoneshieldingdevice)thinkitcanhasanimpactonthestudentsbrainthinkingactivitybyusingthemobilephoneshieldingdeviceintheexaminationroom,especiallythestudentswhositnearthemobilephoneshieldingdeviceareinfluencedgreatly.1Theoperatingprincipleofmobilephoneshieldingdeviceistoemitthenoisewavewiththefrequencyofmobilephone,inordertosubmergethenormalmobilephonecommunicationinthenoise.Becausethemobilephone(GSMandCDMA)ofnowadaysallusethedigitalcommunicationsystemwhichhasthestrongerimmunityfrominterference,high-powernoisesignalmustbeusedinordertointerferethemobilephonecommunicationsignal.Theinterferencesignalimprovesthebiterrorrateofmobilecommunicationchannel,andreducesthesignaltonoiseratioofchannel.Themobilephonecannotcorrectlydecodethebroadcastinformationofthebasestationandlosetheconnectionwiththebasestation.Themobilephonecannotsurewheretheservicezoneiswhenseveralattemptswhichthemobilephonehasmadetosearchforbroadcastsignalsarefailure,sothemobilephoneintheinterferenceareashowsnosignalorawaytheservicezonewhichwillcausethemobilephonecannotsend-receivetheinformationanddialin-out.Withinthecertaindistance,ifthehigh-powernoisesignalexceedsthepublicssafetylimitofelectromagneticradiationwhichisprovidedinthenationalstandard“electromagneticradiationprotection”(GB8702-88),itwillbehazardousonhumanhealth.Inordertodeterminescientificallyandquantitativelywhethertheelectromagneticradiationofmobilephoneshieldingdevicehastheadverseimpactonthestudents,thispaperconsidersthecomprehensiveeffectofmobilephonefromtheelectromagneticradiationintensity,themainradiationdirectionandthedistancewiththeradiationsource.3.INTRODUCTIONOFEXAMELECTROMAGNETICRADIATIONPREDICTIONSYSTEMThesimpleandquickpredictionofthemobilephoneshieldingdevicesradiationfielddistributioncanprovidethequantitativebasisfortherightchoiceofthemobilephoneshieldingdevicesplacement.Thispredictionsystemneedonlychoosethetypeofclassroom,theplacementandthetypeofmobilephoneshieldingdeviceduringtheuse,thissystemcancalculatetheradiationofmobilephoneshieldingdevicebyusingtimedomainfinitedifferencealgorithm(FDTD),andshowtheresultsintheformofsheetorcurve.Basedontheresearchoftheclassroomswhichareusedinthecollegeentranceexamination,thetypeofclassroomcanbeapproximatelydividedthreeclasses:large-scale,middle-scaleandsmall-scale.Eachtypecanalsohastwotothreekindsof1006sizesetting,forexamplelarge-scale(14.85m8.18m),largescale(12m7.2m),middle-scale(11.5m7.2m),middlescale(11m9m),middle-scale(10.5m7.2m),small-scale(9.5m7.2m),small-scale(8.5m7.2m),small-scale(7.38m6.9m).2Theplacementofmobilephoneshieldingdeviceoftenis:frontcenterofclassroom,cornerofwallside,cornerofwindowside,centerofwallside,centerofwindowside.4.PREDICTIONMETHODThefollowingexampleintroducesthecalculationandpredictionmethodofmobilephoneshieldingdeviceselectromagneticradiationfieldinaclassroom.AstothemaximumsignalintensityinthefrequencyrangeofTD-SCDMA2.01G2.025GHz,themaximumamplitudeis123.5dBuVwiththefrequencyof2.025GHz.Thecoaxial-cablewith5.18dBuV(2.025GHz)attenuationisusedduringthemeasurement,sotherealsignalintensityis128.68dBuV.AstothemaximumsignalintensityinthefrequencyrangeofWCDMAandCDMA20002.11G2.17GHz,themaximumamplitudeis121dBuVwiththefrequencyof2.17GHz.Thecoaxial-cablewith4dBuV(2.17GHz)attenuationisusedduringthemeasurableness,sotherealsignalintensityis125dBuV.5.CONCLUSIONInordertodeterminescientificallyandquantitativelythedistributionofthemobilephoneshieldingdeviceselectromagneticradiationfield,theauthoraccomplishestheelectromagneticradiationpredictionsystemofmobilephoneshieldingdevice.Bycomparingthecalculatingresultsofpredictionsystemwiththerealmeasuringresults,theeffectivenessofthepredictionsystemcanbeverified.ThefieldintensityiscomparedwiththepublicelectromagneticradiationexposurestandardofChinaaccordingtothepredictionresults.Theresearchresultscanhelptheenvironmentalprotectionbureauandradiomanagementcommitteetomanagemobilephoneshieldingdevice,theresultscanprovidethescientificfoundationandquantitativedataduringthecollegeentranceexaminationofficedrawsupthemobilephoneshieldingdeviceusemethod.3中文翻译稿考试中手机屏蔽设备的电磁辐射预测系统研究1.摘要现在,许多大型考试需要使用手机屏蔽设备。许多学生和家长感觉手机的电磁辐射对身体会有影响。本文考虑全面手机的电磁辐射的影响强度,主要是辐射方向和距离辐射源。电磁设计考虑到考试预测系统的手机辐射屏蔽设备。通过比较计算得出的预测系统实际测量结果,预测的有效性系统可以验证。根据中国电磁辐射标准,电磁辐射的影响定量分析了手机屏蔽设备。论文提供了安全使用手机屏蔽的距离设备。本文的定量研究明确的指导意义是手机屏蔽设备的使用。2.介绍手机屏蔽设备(有时也称为手机净化器、手机干扰设备),这是最初用于一些特殊部门(如军队或安全)。在近年来,手机屏蔽装置广泛用于会议室、考场、图书馆、电影院、音乐厅、医院、法院和教堂。如今,许多大型考试(如大学入学考试、研究生入学考试)需要使用手机屏蔽设备。这种方法导致许多学生和他们的父母强烈反对,这也会在社区导致相当大的争议。他们不同意使用手机屏蔽设备,并认为它不能有效地防止和消除学生作弊通过使用移动电话。他们(包括的发明手机屏蔽设备的人)认为它可能影响学生使用手机的大脑思维活动,特别是坐在附近的学生受手机屏蔽装置影响很大。手机屏蔽装置的工作原理是发出的噪声的频率电波,以淹没正常手机通信的频率。因为手机(GSM和CDMA)现在都使用数字通信的系统,从而必须使用干扰较强的频率、大功率的噪音信号来干扰手机通信信号。干扰信号提高了一点错误率的移动通信通道,减少通道的信号噪声比。手机不能正确解码基站广播的信息，从而与基站失去了连接。移动电话不确定服务区域是哪几个尝试的手机搜索广播信号故障,所以手机的干扰区域显示无信号或服务区域。这将导致手机不能收发转换信息和拨号输入输出。在一定的距离,如果大功率噪声信号超过了公众的安全限制国家提供的电磁辐射电磁辐射标准的“保护”(gb8702-88),它将对人类健康有害。4为了确定是否手机的电磁辐射屏蔽设备对学生有不利影响,论文从电磁辐射的强度研究手机的综合效应,主要是辐射方向和辐射源的距离。3.引入电磁辐射预测系统简单和快速预测到的移动电话屏蔽设备的辐射场分布可以提供定量手机选择屏蔽设备的位置。该预测系统需