简介：ＢｅａｍＭｏｄｕｌａｔｏｒｏｆＰｈｏｔｏｅｌｅｃｔｒｉｃＰｕｌｓｅ￥ＧｕＺｈｏｎｇｄａｏ；ＷａｎｇＷｅｉａｎｄＤｏｎｇＣｈｅｎｇｆｕＴｈｅｅｘｐｌｏｒａｔｉｏｎｏｆｎｕｃｌｉｄｅｆａｒｆｒｏｍｔｉｌｅβｓｔａｂｉｌｉｔｙｌｉｎｅ（ｅｘｏｔｉｃ...

简介：Pulsediagnosisisaspecialmethodofdiagnosingpatient’sdisease.Amathematicalmodelofthepulseispresentedinthispaper.Thefeatureparametersofthesphygmogramareextractedbasedonthesignalmodel.Thediscriminationandprincipalanalysisareemployedtoidentifythepulses.Theresultsarematchingwiththoseoftraditionalmethods.

简介：Thispapergivesaspectrumexpressionwhichissimpleandhasaclearphysicalconceptionforpulsefrequencymodulationsignal,andhasbeenconfirmedbyanexperimentsimultaneously.

简介：ThemethodofproducingacompleteMRIimageisbasedontheanalysisoffreeinductiondecay.ItmainlystudieswhenandhowmagneticvectorrevestsitsinitialstateafterRFpulse,butneglectstheeffectoftheRFform.Inthispaperwemainlystudythis.WegivethemathematicexpressionofRFpulsewhichcantheoreticallyimproveimage（?）ality.InMRI,B1（t）isthealternateelectromagneticexcitationfield,itcanbeexpressedasfollows:

简介：Energytransmissionefficiencyinthemagneticpulsegeneratorsvarieswithsaturatedtimeofmagneticswitch.Anoptimalmatchingtimeexistsanddependsonthecompressionratio,underwhich,theenergytransmissionefficiencycanreachapproximate100%.Theequationofrequiredmagneticcorevolumeisobtainedbytakenintoaccounttheoptimalmatchingmode.Itindicatesthatagreatreductiononthevolumeisfeasibleundertheoptimalmatchingmode.Thecircuitsimulationcode-PSPICEisalsointroducedtosimulatea3-stagemagneticpulsecompressor,andtheresultsareinaccordancewiththoseofequivalentcircuitanalyses.

简介：Astaticapproachmethodmethodisusedtogetthespectrumexpressionofthepulseintervalmodulationsignal.Theexpressionissimple,hasaclearphysicalconceptandithasbeenconfirmedbyasimultaneousexperiment.

简介：Toinvestigatethefeasibilityforahelicallinetobeusedasapulseformingline(PFL),thetransmissioncharacteristicsofthehelicaltransmissionlineisstudiedboththeoreticallyandexperimentally.Theresultsindicatethatitisfeasibletoemployahelicallineasalong-pulsePFL,andtheinfluenceofitsdispersionisnegligible.ComparedwithaconventionalcoaxialPFL,thehelicalPFLwiththesamesizecanproducealongerpulse.

简介：ＳＴＵＤＹＯＮＭＥＣＨＡＮＩＳＭＯＦＴＨＥＢＩＯＥＦＦＥＣＴＳＯＦＴＲＡＮＳＩＥＮＴＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＰＵＬＳＥＳＴＵＤＹＯＮＭＥＣＨＡＮＩＳＭＯＦＴＨＥＢＩＯＥＦＦＥＣＴＳＯＦＴＲＡＮＳＩＥＮＴＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＰＵＬＳＥＷ...

简介：ThispaperstudiesthedynamicresponsesofSDOFsystemunderpulse-dominantexcitations.Thepurposeofthestudyistoprepareforscrutinyofsomenear-fieldpulse-dominantgroundmotionsandtheirpotentialtocausestructuraldamage.Extendingthesinglepulsedynamics,weconsidertheeffectofpulsesequences.ThiskindofexcitationwasparticularlyobviousinsomeofpreviousearthquakessuchasNorthridge(1994)andChi-Chi(1995).Basedontheduration,peakandriseanddecayeraofthemainpulseaswellasitsrelationshipwiththepredecessorandsuccessorpulses,weproposeaclassificationforthepulsesequences.Consequentstudieshavebeencarriedoutforacceleration,velocityanddisplacementresponsespectraofthemainpulsewitheitherapredecessororasuccessorpulse.Theanalysisalsoincludesgeneralresponsebehaviorsindifferentfundamentalperiodsegmentsandspecialaspectsofresponseatcertainpoints(e.g.,thecorrespondingpeakpoints).

简介：ＥＦＦＥＣＴＳＯＦＰＵＬＳＥＭＡＧＮＥＴＩＣＦＩＥＬＤＯＮＣＨＡＮＧＥＳＯＦＲＨＥＯＬＯＧＩＣＡＬＰＲＯＰＥＲＴＹＥＦＦＥＣＴＳＯＦＰＵＬＳＥＭＡＧＮＥＴＩＣＦＩＥＬＤＯＮＣＨＡＮＧＥＳＯＦＲＨＥＯＬＯＧＩＣＡＬＰＲＯＰＥＲＴＹＷａｎｇＴｉａｎｙｏｕ...

简介：Theoxidativesplittingprocessofcis-syn1,3-dimethyluracilcyclobutanedimer(DMUD)inaqueoussolutionwasinvestigatedusingpulseradiolysistechnique.TheresultsindicatedthatDMUDcanbesplittedinto1,3-dimethyluracil(DMU)byOHradicals(OH)andBr2radicalanions(Br2^-),butnotbyazideradicals(N3^).TheoxidativemechanismsthatanH-abstractedfromDMUDforOHoxidativesplittingandanelectrontransferfromDMUDtoBr2-,weresuggested.Relatedkineticparametersweredetermined.

简介：

简介：ThePMD-inducedpulsebroadeningmaycausethedegradationofreceiversensitivityandhasnegativeeffectsonthepowerspectrumofreceivedsignals.TheexpressionsofPMD-inducedpulsebroadeningeffectsonreceiversensitivityarederivedbasedontheconceptofmeansquarepulsewidth.TheeffectsofPMDonthespectrumofreceivedpowerareanalyzedindetail.Finally,theschemeisdiscussedwithwhichthepowerofacertainfrequencycomponentisextractedasafeedbackcontrolsignalinaPMDcompensationsystem.

简介：

简介：TheapplicationoftherandombinaryphasecodedsignalintheCWradarsystemhasbeenlimitedbythedifficultytoisolatethetransmissionandreceptionsignal.Inordertomakeuseoftherandombinaryphasecodedsignal,therandombinaryphasecodedpulseradar(RBPC-PR)systemhasbeenstudied.First,theaverageambiguityfunction(AAF)oftheRBPC-PRsignalhasbeenanalyzed.Then,astatisticalmethodofreducingtherangesidelobe(RSL)ispresented.Finally,asignalprocessingschemeoftheRBPC-PRisdevdoped.Thesimulationresultsshowthatbyusingthescheme,thejammingimmunityofthesystem,theresolutionandaccuracyofdistanceandvelocityhavebeenimproved,andthedistanceandvelocityvaguenesscausedbyperiodscanalsoberemoved.TheRSLcanbereducedover30dBbythestatisticalaveragemethod,thustheprobabilityambiguitycausedbyrandomnoisecanbeavoided.

简介：Theconceptofhealthmonitoringisakeyaspectofthefieldofmedicinethathasbeenpracticedforalongtime.Acommonlyuseddiagnosticandhealthmonitoringpracticeispulsediagnosis,whichcanbetracedbackapproximatelyfivethousandyearsintherecordedhistoryofChina.Withadvancesinthedevelopmentofmodemtechnology,theconceptofhealthmonitoringofavarietyofengineeringstructuresinseveralapplicationshasbeguntoattractwidespreadattention.Ofparticularinterestinthisstudyisthehealthmonitoringofcivilstructures.Itseemsnatural,andevenbeneficial,thatthesetwohealth-monitoringmethods,oneasappliestothehumanbodyandtheothertocivilstructures,shouldbeanalyzedandcompared.Inthispaper,thebasicconceptsandtheoriesofthetwomonitoringmethodsarefirstdiscussed.Similaritiesarethensummarizedandcommentedupon.Itishopedthatthiscorrelationanalysismayhelpprovidestructuralengineerswithsomeinsightsintotheintrinsicconceptofusingpulsediagnosisinhumanhealthmonitoring,whichmaybeofsomebenefitinthedevelopmentofmodernstructuralhealthmonitoringmethods.

简介：AjammingsuppressionmethodbasedonpolarizationsignaldetectionisproposedundercommonrangeandvelocitycheatingjammingforpulseDopplerradar.Onthebasisoftheseparationofthetargetandthejamming,therangeandvelocitytrackonthetruetargetarerealized.FirstlythesignalprocessingmodelofthefullpolarizationpulseDopplerradarisintroduced.Secondlythemethodofcorrecttargetseparationisdiscussed,whichisthetwicedetectionsofenergyandpolarizationstateonthetwodimensionresolutioncellsofrangeandvelocityoftheradarecho.Finallythesimulationsareperformedandtheresultsprovethevalidity.What'smore,multiplerangeandvelocitycheatingjammingcanbesuppressedatthesametimeifthetargetandthejammingaredifferentinthepolarizationdomain.

简介：

简介：Thetotalefficiencyofpowerplantsdependsontheenergyconversioninacombustorandaturbine.Considerablyhigherenergytransferratescanbeobtainedfromapulsedcombustion.butunsteadyflowofasinglejetcombustorreducestheturbineefficiency.Therefore.twopulsecombustorsweresetinparallelandconnectedtoasettlingchamberthatsuppliesaflowwithconstantpressuretotheturbine.Theaimofinvestigationspresentedhereisademonstrationoftechnicalfeasibilityforindustrialapplicationsandtoshowthebenefitsobtainedfromthepulsecombustors.

简介：Theoreticalandexperimentalresearchoflowfrequencypulsecompressionandchannelmatchinshallowwatersoundchannelwerecarriedoutbasedon2000-WinterYellowSeaexperiment.Usingpulsecompressionmethod,signalswithhighsignaltonoiseratio(SNR)werereceivedoverrangeof110kilometersintheexperiment.TheSNRgainintheprocessisconsistentwiththetheoreticalprediction.Theexperimentalmeasurementindicatedthatthechannelishighlycoherentoveralengthof500s.ChannelmatchmethodwasusedtocompensatethedegradationofpulsecompressionSNRcausedbythemulti-pathpropagation.AndtheSNRgaininthechannelmatchprocesscanbetheoreticallypredicted.ExperimentalresultsshowthatlowfrequencypulsecompressionandchannelmatchmethodcanbeusedinshallowwatersoundchanneltoimprovetheSNR.