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

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

简介：Thispapergivesaspectrumexpressionwhichissimpleandhasaclearphysicalconceptionforpulsefrequencymodulationsignal,andhasbeenconfirmedbyanexperimentsimultaneously.

简介：把低频率的充满水的阻抗试管测试设备基于存在，它是在北京的海军的海底的战争中心的低频率设备的部分，一个改进充满水的脉搏试管方法在这份短报纸被介绍。因为能力，这建议研究与常规脉搏试管方法显著地不同因为一架单个飞机抑制了正弦脉搏向招手与常规波形和大约1ms的短持续时间时间在充满水的脉搏试管产生。在脉搏的产生过程期间，一个反的过滤器原则被采用补偿变换器反应。试管结束的特征的效果能通过脉搏的产生过程被消除。从一个水/空气接口的思考系数被测量验证建议方法。什么时候与期望的理论价值相比，一个相对好的协议能在5002000Hz的低频率范围被获得。

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：Highcoherenceofthelaserisindispensablelightsourcesinmodernlongorshort-distanceimagingsystems,becausethehighcoherenceleadstocoherentartifactssuchasspecklethatcorruptimageformation.Todeliverlowcoherencepulsesinfiberamplifiers,weutilizethesuperluminescentpulsedlightwithbroadbandwidth,nonlongitudinalmodestructureandchaoticmodephaseastheseedsourceofthecascadedfiberamplifiers.Theinfluenceoffibersuperluminescentpulseamplification(SPA)onthelimitationsoftheperformanceisanalyzed.AreviewofourresearchresultsforSPAinthefibersarepresent,includingthenonlineartheoriesofthislowcoherentlightsources,i.e.,self-focusing(SF),stimulatedRamanscattering(SRS)andself-phasemodulation(SPM)effects,andtheexperimentresultsofthenanosecondpulseswithpeakpowerashighas4.8MWandpulseenergyasmuchas55mJ.ToimprovethebrightnessofSPAlightinthefuturework,weintroduceournovelevaluationtermandamorereasonablecriterion,whichisdenotedbyanewparameterofbrightnessfactorforactivelargemodeareafiberdesigns.Acore-dopedactivelargepitchfiberwithacorediameterof190μmandamode-fielddiameterof180μmisdesignedbythismethod.Thedesignedfiberallowsneardiffractedlimitedbeamqualityoperation,anditcanachieve100mJpulseenergyand540Waveragepowerbyanalyzingthemodecouplingeffectsinducedbyheat.

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简介：ＳＴＵＤＹＯＮＭＥＣＨＡＮＩＳＭＯＦＴＨＥＢＩＯＥＦＦＥＣＴＳＯＦＴＲＡＮＳＩＥＮＴＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＰＵＬＳＥＳＴＵＤＹＯＮＭＥＣＨＡＮＩＳＭＯＦＴＨＥＢＩＯＥＦＦＥＣＴＳＯＦＴＲＡＮＳＩＥＮＴＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＰＵＬＳＥＷ...

简介：Twodifferentpulsecleaningtechniquesforultra-highcontrastlasersystemsarecomparablyanalysedinthiswork.Thefirstpulsecleaningtechniqueisbasedonnoncollinearfemtosecondoptical-parametricamplification(NOPA)andsecond-harmonicgeneration(SHG)processes.Theotherisbasedoncross-polarizedwave(XPW)generation.Withadoublechirpedpulseamplifier(double-CPA)scheme,althoughtemporalcontrastenhancementinahigh-intensityfemtosecondTi:sapphirechirpedpulseamplification(CPA)lasersystemcanbeachievedbasedonbothofthetechniques,thetwodifferentpulsecleaningtechniquesstillhavetheirownadvantagesandaresuitablefordifferentcontrastenhancementrequirementsofdifferentlasersystems.

简介：PuLsetransittime(FIT)isusedasanoninvasiveandcull-lessparametertoestimatebloodpressure.Inthispaper,wedevelopanalgorithmtoobtainFTTrapidly,whichisappropriateformicro-processorandcouldachievegoodaccuracyinPTT,eveninnoisymeasurements.Thealgorithmisbasedonfiniteimpulseresponse(FIR)filtertoreducethenoiseandanadaptivethresholdtodetectthesignificantpointsofECGandPPG.EvaluationofthismethodisbasedonthesignalsfromourPTr-basedbloodpressuredevices.ItisshownthatthemethodworkswellforPPTcalculation.

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

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简介：ＥＦＦＥＣＴＳＯＦＰＵＬＳＥＭＡＧＮＥＴＩＣＦＩＥＬＤＯＮＣＨＡＮＧＥＳＯＦＲＨＥＯＬＯＧＩＣＡＬＰＲＯＰＥＲＴＹＥＦＦＥＣＴＳＯＦＰＵＬＳＥＭＡＧＮＥＴＩＣＦＩＥＬＤＯＮＣＨＡＮＧＥＳＯＦＲＨＥＯＬＯＧＩＣＡＬＰＲＯＰＥＲＴＹＷａｎｇＴｉａｎｙｏｕ...

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