简介：为了满足信息的要求，在宽区域保护系统交换变化和方式，一个通讯服务模型基于IEC61850被建议。这个服务模型能认识到在设备的不同类型之间的通讯一致性和合作。而且，通讯可靠性和时间延期性能被保证从上面的层满足继电器保护的要求。通用变电所事件(GSE)和它的通讯机制的消息结构被讨论。由通用变电所地位事件(GSSE)传达数字信息并且由GSE的采样类似物价值(SAV)传达模拟采样信息的一般方法被建议。

简介：完成一个14位的连续近似收款机analog-to-digital变换器(SAR模数转换器)的一种错误修正技术被建议。一个悦耳的裂口电容器被设计消除寄生电容器引起的失配。进程失配引起的电容器数组的线性错误被能改进采样率的一个新奇刻度电容器数组校准。双比较仪的拓扑学保证ADC的速度和精确。模拟结果证明在刻度以后的SAR模数转换器在500kilosamples/s完成83.07dBSNDR和13.5小点ENOB。

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简介：Throughthesamplesurveyofprimaryandjuniorhighschoolstudentsandteachersonstudents＇physiquefromvariousprovincesandcitiesinChina,theresulthasshownthedeclineofstudents＇physique.Therearemanyreasons.Forstudents,thereasonsaretheheavyacademicburden;lackofinterest,time,andknowledgeinphysicalexercise;andthatthehabitofexercisewasnotdeveloped.Forfamily,familyeducationremainsfocusingmoreonintellectualthanphysical,nutritionthanexercise,andignoringthepositionandroleofsportsinthefamily.Forschool,thereasonsarethelackofsupportforphysicaleducation,thelimitedsportsactivities,andthetediousacticitytype.Forcommunity,thesportsfacilitiesandfieldsareinsufficient,andthereexistsanunevendistributionbetweenruralandurban.Bymeansofimplementinglawsandregulationsofphysicaleducation,strengtheningschoolsportsinfrastructure,enrichingteachers＇professionalknowledgeofphysicaleducation,stimulatingstudents＇interestinphysicalexercise,andeliminatingtheblindunderstandingofphysicalhealthbyparents,wecanpromotestudents＇physique.

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简介：Researchindicatesthathighlevelsofsedentarybehavior(sittingorlyingwithlowenergyexpenditure)areadverselyassociatedwithhealth.Akeyfactorinimprovingourunderstandingoftheimpactofsedentarybehavior(andpatternsofsedentarytimeaccumulation)onhealthistheuseofobjectivemeasurementtoolsthatcollectdateandtime-stampedactivityinformation.OnesuchtoolistheactivPALmonitor.Thisthigh-worndeviceusesaccelerometer-derivedinformationaboutthighpositiontodeterminethestartandendofeachperiodspentsitting/lying,standing,andstepping,aswellassteppingspeed,stepcounts,andposturaltransitions.TheactivPALisincreasinglybeingusedwithinfield-basedresearchforitsabilitytomeasuresitting/lyingviaposture.WesummarisekeyissuestoconsiderwhenusingtheactivPALinphysicalactivityandsedentarybehaviorfield-basedresearchwithadultpopulations.ItisintendedthatthefindingsanddiscussionpointsbeinformativeforresearcherswhoarecurrentlyusingactivPALmonitorsorareintendingtousethem.Pre-datacollectiondecisions,monitorpreparationanddistribution,datacollectionconsiderations,andmanualandautomateddataprocessingpossibilitiesarepresentedusingexamplesfromcurrentliteratureandexperiencesfrom2researchgroupsfromtheUKandAustralia.

简介：Conventionalcameracalibrationthatemployscalibrationtargetsisacommonlyusedmethodtoacquireacamera'sintrinsicand/orextrinsicparameters.Thecalibrationtargetsareusuallydesignedasperiodicarraysofsimplehigh-contrastpatternsthatprovidehighlyaccurateworldcoordinatesystempointsandthecorrespondingimagepixelcoordinatesystempoints.Theexistingpixelcoordinateextractionalgorithmscanreachasub-pixellevel;however,theytreateachsinglepatterninoneimageasanindependentindividual,whichmakesitdifficulttofurtherimproveextractionaccuracy.Inthispaper,anovelmethodisproposedbyutilizingtheperiodicarrangementcharacteristicsofthecalibrationtargetpatternasaglobalconstrainttoimprovethecalibrationaccuracy.Basedonacamera'spinholemodel,theintersectionpointoftwofittedcurvesisusedasanoptimizedpixelpointtoreplacetheinitialone.Followingthepixelcoordinateoptimizationprocedures,experimentswereperformedusingrealdatafroma3Dlaserlinescannerandadynamicprecisioncalibrationtarget.Ourresultsshowthattherelativeerrorsofcamerahomographymatrixelementsobtainedbytheproposedoptimizationmethodwerereducedcomparedwiththecommonlyusedmethod.Theaveragecoordinatemeasurementaccuracycanbeimprovedbynearly0.05mm.Itisshownthattheproposedoptimizationmethodcanenhancethecameracalibrationaccuracy,especiallywhentheextractedpixelsareofpoorerprecision.

简介：ThereisnodoubtthatteacherquestioningisoneofthemostcrucialcomponentsinEnglishclassroomteaching.Itisanessentialandeffectivechannelforteacherstointeractandcommunicatewithstudents.Moreimportantly,itplaysanextremelypartininspiringstudentstothinkcriticallyandfosteringtheirproblem-solvingcapabilities.GiventhatteacherquestioningissosignificantinEnglishclassroomteaching,thepresentpaperwillmakeananalysisofteacherquestioningfromtheperspectiveofspeechacttheorywithanaimtogivingsomeconstructivepedagogicimplicationstoEnglishteachers.

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简介：Toestablishafinancialearly-warningmodelwithhighaccuracyofdiscriminationandachievetheaimoflong-termprediction,principalcomponentanalysis(PCA),Fisherdiscriminant,togetherwithgreyforecastingmodelsareusedatthesametime.110A-sharecompanieslistedontheShanghaiandShenzhenstockexchangeareselectedasresearchsamples.And10extractivefactorswith89.746%ofalltheoriginalinformationaredeterminedbyapplyingPCA,whichobtainsthegoalofdimensionreductionwithout...

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简介：I.IntroductionInthehistoryofELTinChina,greatchangeshavetakenplaceinthelate1990ssincecommunicativelanguageteach-ing(CLT)wasacceptedasamainteachingmethod(Xiao,2000)inChinawhereithasmadeagreatimpact.IntheChi-neseso-calledcommunicativeclassroom,teachersgenerallya-

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