简介：Withthedevelopmentofcleanenergy,switchinganddistributionissuesinaphotovoltaicsystemaregettingmuchattentioninrecentyears.ThispaperdesignsaDCtoACinverterandpowerswitchinganddistributionsystembetweenasolarpowersystemandthemunicipalsystembyusingtheDarlingtonamplifierstructurewiththephotosensitiveresistorandaccompanyingrelays,anddetailsthesystemcircuits.Theproposedsystemcanachieveastableoutputof110VAC,aswellasself-generatingdrivingvoltageandswitchingbetweenthemunicipalelectricalsystemandthesolarpowersystem.Themathematicanalysisandactuallytestresultsdemonstratethattheproposedmethodisaneasy,inexpensive,andlowcostwaytobuildasolarpowerswitchinganddistributionsystem.

简介：Thispaperproposesahybriddecoupledpowerflowmethodforbalancedpowerdistributionsystemswithdistributedgenerationsources.Themethodformulatesthepowerflowequationsinactivepowerandreactivepowerdecoupledformwithpolarcoordinates.Second-ordertermsareincludedintheactivepowermismatchiteration,andconstantJacobianandHessianmatricesareused.Ahybriddirectandindirectsolutiontechniqueisusedtoachieveefficiencyandrobustnessofthealgorithm.Activepowercorrectionissolvedbymeansofasparselowertriangularanduppertriangular(LU)decompositionalgorithmwithpartialpivoting,andthereactivepowercorrectionissolvedbymeansofrestartedgeneralizedminimalresidualalgorithmwithanincompleteLUpre-conditioner.Typicaldistributiongenerationmodelsanddistributionloadmodelsareincluded.Theimpactofzero-impedancebranchesisexplicitlymodeledthroughreconfiguringoftheadjacentbrancheswithimpedances.Numericalexamplesonasampledistributionsystemwithwidespreadphotovoltaicinstallationsaregiventodemonstratetheeffectivenessoftheproposedmethod.

简介：Anintelligentcoordinatedcontrolstrategyhasbeenproposedandsuccessfullyappliedtoa300MWboiler-tur-bineuniti.e.Unit1ofYuanbaoshanpowerplantinChina.Loadfollowingoperationofcoal-firedboiler-turbineunitinthepowerplantleadstochangesinoperatingpointswhichresultinnonlinearvariationsoftheplantvariablesandparameters.Forthevariationofoperatingconditionandslowlyvaryingdynamics,anintelligentcontrolschemehasbeendevelopedbycombiningfuzzyself-tuningwithadaptivecontrolandauto-tuningtechniques.Asthereexiststrongcouplingsbetweencontrolloopsofmainsteampressureandpoweroutputintheunit,anewdesignforstaticdecoupleraimedatdecouplingforsetpointsandunmeasuredpulverizedcoaldisturbanceofthesystematthesametimeispresented.Satisfactoryindustrialapplicationresultsshowthatsuchacontrolsystemhasenhancedadaptabilityandrobustnesstothecomplexprocess,andbettercontrolperformanceandhigheconomicbenefithavebeenobtained.

简介：Twomethodsforimprovingtheequidrivingpower-frequencycharacteristicsofbroad-bandhighpowerklystronsarepresented.Oneisthatacomb-linebandpassfilterwithsomeattenuationpropertiesisinsertedbetweentheTWTdriverandtheklystronforcompensatingthegain-frequencycharacteristicsoftheklystrontogettherequiredequidrivingpower-frequencycharacteristics.Theotheristhatareactiveelementisconnectedwiththeinputcavitytochangeitsresonancefrequenciesf0andQL,andthustoimprovethepower-frequencycharacteristicsoftheklystron.

简介：InordertoeffectivelyimitatethedynamicoperationcharacteristicsoftheHVDC(highvoltagedirectcurrent)powertransmissionsystematareal±500kVHVDCtransmissionproject,theelectro-mechanical-electromagnetictransienthybridsimulationwascarriedoutbasedonadvanceddigitalpowersystemsimulator(ADPSS).Inthesimulationanalysis,thebuilthybridmodel'sdynamicresponseoutputsunderthreedifferentfaultconditionsareconsidered,andbycomparingwiththeselectedfaultrecordingwaveforms,thevaliditiesofthesimulationwaveformsareestimatedqualitatively.ItcanbeascertainedthatthehybridsimulationmodelhastheabilitytodescribetheHVDCsystem'sdynamicchangetrendswellundersomespecialfaultconditions.

简介：ＤｙｎａｍｉｃＣｕｒｒｅｎｔＳｈａｒｉｎｇｉｎＰａｒａｌｅｌｉｎｇＰｏｗｅｒＭＯＳＦＥＴ①ＷＡＮＧＢａｏｃｈｅｎｇ，ＷＵＷｅｉｙａｎｇ，ＺＨＡＮＧＣｈｕｎｊｉａｎｇ（ＹａｎｓｈａｎＵｎｉｖｅｒｓｉｔｙ，Ｑｉｎｈｕａｎｇｄａｏ０６６００４，ＣＨＮ）Ａｂ...

简介：InGaAsP/GaAsSCHSQWlaershavebeenpreparedbyLPMOCVD.Thedependenceofthresholdcurrentdensityoncavitylengthwasexplained.Laserdiodesarecharacterizedbytheoutputpowerof1W20W,thresholdcurrentdensity(Jth)of330A/cm^2to450A/cm^2andexternaldifferentialquantumefficiency(ηd)of35%to75%,andthesecharacteristicsareingoodagreementwiththedesignedrequirement.

简介：ForthereliabilityandpowerconsumptionissuesofEthernetdatatransmissionbasedonthefieldprogrammablegatearray(FPGA),alow-powerconsumptiondesignmethodisproposed,whichissuitableforFPGAimplementation.Toreducethedynamicpowerconsumptionofintegratedcircuit(IC)design,theproposedmethodadoptsthedynamiccontroloftheclockfrequency.Formostofthetime,whentheportisintheidlestateorlower-ratestate,userscanreduceoreventurnoffthereadingclockfrequencyandreducetheclockflipfrequencyinordertoreducethedynamicpowerconsumption.Whenthereceivingrateishigh,thereadingclockfrequencywillbeimprovedtimelytoensurethatnodatawilllost.SimulatedandverifiedbyModelsim,theproposedmethodcandynamicallycontroltheclockfrequency,includingthedynamicswitchingofhigh-speedandlow-speedclockfliprates,orstopoftheclockflip.

简介：Fromseveralmodelsaboutdamagemechanis,thedamagemecanismofopticalfilmsandthefactorswhichaffectthedamagethresholdaredescribedexperi-mentallyandtheoretically.Somereasonableproposalsaregivenisthispaperonhowtoselectthehigh-thresholdfimls.

简介：Toavoidtheinaccurateestimationoftheactiveuser'snumberandthecorrespondingperformancedegradation,anovelPOR-basedUserIdentificationDetector(UID)isproposedfortheCodeDivisionMultipleAccess(CDMA)systems.ThenewdetectoradoptsthePowerofR(POR)techniqueandtheMultipleSignalClassification(MUSIC)method,whichdoesnotrequiretheestimationofactiveusers'number,andobtainslowerfalsealarmprobabilitythanthesubspace-basedUIDinthemultipathchannels.However,fromouranalysis,increasingtheordermdoesnotimprovetheperformance.Therefore,whenmisone,theperformanceofthenewdetectorismaximal.

简介：Cadence设计系统公司近日宣布，它将与IBM合作启动Power．org，这是一个帮助集成电路设计师们使用IBMPowerPCArchitecture开发片上系统(SoC)的标准开放网上社区。Power．org致力于推广IBMPowerPCArchitecture，使其成为诸如消费电子、网络、存储、军用以及自动化等市场所使用电子系统首选的开放式标准硬件开发平台。

简介：Thephaseandfrequencylockingofmicrowave,millimeterwavepowercombiningwereanalysedandsummarizedinanall-roundway.Themaster/slavephaselockingofcavityoscillators,thepeerphaselockingofmutuallycoupledoscillators,andthepeerphaselockingofring-connectedmultipleoscillatorswereinvestigated.Theresultsofnumericalcalculations,andtherelationsofphasetophaselockingmodelandoscillatorparametersweregiven.Andthecavityandspacepowercombiningaspectsformicrowaveandmillimeterwavewerepresented.

简介：Featurereductionisakeyprocessinpatternrecognition.Thispaperdealswiththefeaturereductionmethodsforatime-shiftinvariantfeature,powerspectrum,inRadarAutomaticTargetRecognition(RATR)usingHigh-ResolutionRangeProfiles(HRRPs).Severalexistingfeaturereductionmethodsinpatternrecognitionareanalyzed,andaweightedfeaturereductionmethodbasedonFisher'sDiscriminantRatio(FDR)isproposedinthispaper.AccordingtothecharacteristicsofradarHRRPtargetrecognition,thisproposedmethodsearchestheoptimalweightvectorforpowerspectraofHRRPsbymeansofaniterativealgorithm,andthusreducesfeaturedimensionality.Comparedwiththemethodofusingrawpowerspectraandsomeexistingfeaturereductionmethods,theweightedfeaturereductionmethodcannotonlyreducefeaturedimensionality,butalsoimproverecognitionperformancewithlowcomputationcomplexity.Intherecognitionexperimentsbasedonmeasureddata,theproposedmethodisrobusttodifferenttestdataandachievesgoodrecognitionresults.

简介：在微弱地指导的盒子中，在核心和左手的材料纤维的cladding的力量繁殖被解决麦克斯韦鈥檚方程获得。波导效率在截止并且远离截止被分析。远离截止，波导效率等于到1。在截止，为m=0，1，波导效率平等者到零；为m=2，波导效率来临到无限；为m>2，波导效率是不到零，但是它的绝对值比1大。那些是左手的材料纤维的新奇特征。CLC数字TN253这个工作被中国(60277025)和上海领先的学术学科工程(T0102)的国家性质科学基础支持

简介：热管理是为射出二极管的高力量的光的关键技术之一(带)进入一般照亮域。成功的热管理取决于最佳的包装结构和选择包装材料。在这份报纸，铝作为底层被采用带，3

简介：Basedonanalyzingsignificanceofcontrollingclockindesignoflowpowersequentialcircuits,thispaperproposesatechniquethatthegatingsignalisderivedfromthemasterlatchinaflip-floptomakethederivedclockhavingnoglitchandnoskew.Thedesignofadecimalcounterwithhalf-frequencydivisionshowsthatbyusingthesynchronousderivedclockthecounterhaslowerpowerdissipationaswellassimplercombinationallogic.Computersimulationshows20%powersaving.

简介：ThispaperstudiesthepowercontrolprobleminfemtocellsystembasedonNashnon-cooperativegametheory.Itdesignsanutilityfunctiontakingfemstations'transmitpowerasvariableandrelatesittotherequirementsofmacrousers'andfemusers'signaltointerferenceplusnoiseratio(SINR).Theutilityalsotakestheimpactoffemstations'locationintoaccountandimprovesthefairnessofnon-cooperativegame.Onthisbasis,thispaperproposesadistributedpowercontrolalgorithmandprovestheexistenceanduniquenessofParetooptimalpoint.Thesimulationresultsshowthatthealgorithmimprovestheconvergencespeedandsystemperformancethroughimprovingusers'SINR.

简介：复合微分电压比较仪(MDVC)的一个新奇图案为减少电流和电源驱散被介绍。根据关系操作和逻辑操作的特殊性质，比较仪的部分在一些例子是冗余的，并且能因此被关掉。由选择并且切换当前的线路，几有效的微分对被单个尾巴电流stage-by-stage偏导，冗余的比较仪被切他们的尾巴电流关掉。作为结果，静止电流和电源消费极大地被减少。切换电流被输入完成微分对晶体管自己和因此没有额外的开关被要求。当MDVC很快被使用时analog-to-digital变换器(模数转换器)，它的当前的驱散比常规比较仪的低得多。这体系结构能也为逻辑操作在窗户比较仪，最大或最小的比较仪，和比较仪被使用。在所有这些盒子中的电源驱散能显著地被减少。

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简介：Analysisofthescatteringparameters(S-parameters)ofplanarN-waymetamaterialpowerdividers/combinersmostlyusescommercialmicrowavecircuitsimulatorsduetothelargecircuitsizeinvolved.Thispaperpresentsanefficientcircuitmodelingapproach,whichisbasedonthemulti-inputandmulti-outputtransmissionmatrix(T-matrix)method,toanalyzetheS-parameterofaplanarnine-waymetamaterialpower-divider/combinerstructure.S-parametercomputationresultsareshowningoodagreementwiththesimulationresultsbyusingtheAgilentadvanceddesignsystem(ADS)andmeasurementresults.ThecomputationtimeofanN-waymetamaterialpowerdivider/combinerwithN=5,9,13,and17usingT-matrixmethodisalsocomparedwiththoseofADSandAWRMicrowaveOffice(MWO)todemonstrateitscomputationalefficiency.