简介：AprototypeofPulsedPlasmaArcCladdingsystemwasdeveloped,inwhichsinglepowersourcesuppliesbothtransferredplasmaarc(TPA)andnon-transferredplasmaarc(N-TPA).BothplasmasworkinturninahighfrequencycontrolledbyanIGBTconnectingnozzleandworkpiece.TheworkingfrequencyofIGBTrangesfrom50～7000Hz,inwhichtheplasmascanworkinturnsmoothly.Higherthan500HzofworkingfrequencyissuggestedforpromotionofcladdingqualityandprotectionofIGBT.DragphenomenonofTPAintensifiesasthefrequencygoesup,whichtendstoincreasethecurrentproportionofTPAandsuppressN-TPA.TheoccupationratioofIGBTcanberegulatedfrom5%～95%,whichbalancesthepowersuppliesofbothplasmas.Anoccupationratiohigherthan50%givesadequateproportionofarccurrentforN-TPAtopreheatpowder.

简介：PowersupplysystemisanimportantsubsystemofCSR.Toapplyforrunning,theparametersofpowersupplymustbefitthedesign’sdemands.Wehavetestedallprototypeofpowersupplyasfollows.TheDCstabilitymeasurementisthatthepowersupplyrunsincertaincurrentlevelfromthelowervaluetothenormalvalue.Ineverycurrentlevel,weacquireabout550databydigitalmeter(model7081)in8h.

简介：In2001,CSRpowersupplysystemmadeagreatprogress.ThreeprototypesweredesignedforCSRquadrupleandcorrectmagnet.Threedifferentcompaniesprovidedthethreeprototypes,butthesamecircuit-chopperwereemployed.ThesimplifieddiagramisshowedinFig.1.Allpulsedswitchingpowersupplyprototypesweretestedsuccessfullybeforetheendof2001.

简介：在这个统一模型，我们介绍联合时间的电子声子(t即)和激光脉搏宽度(tp)。为长脉搏，它能代替传统的热传导模型；当时为超短波的脉搏，它能代替标准二温度的模型。作为金目标的一个例子，我们在时间得到电子和离子温度发展的依赖并且由用有限差别的时间域(FDTD)解决热传导方程放方法。它在对试验性的数据的好同意。我们用Saha方程获得脱离的发作的临界溶液温度然后当激光脉搏宽度从毫微秒到飞米第二次规模时，获得激光脱离阀值的理论价值，它与试验性的数据在于很好。

简介：Inthispaper,wegivethedistributionoftemperaturefie1dandpulsephotoacousticpressuregener-atedbypulsedlaserinliquid.Theeffectofpulsedurationandlaserbeamdimensiononthepres-suresignalisdiscussed.TheexperimentalresultsobtainedbytheGausslaserbeamdeflectiontech-niqueagreewiththetheoryqualitatively.Thistechniqueprovidesanovelopticalmethodforthecontactlessandrapidmeasurementofthermodynamicparameters.

简介：Photoconductiveswitcheswerethekeycomponentsthatallowedthegenerationanddetectionofcoherentbroadbandelectromagneticpulsesatterahertzfrequencies,openingthepossibilityforperformingspectroscopyand,therefore,measuringcomplexdielectricpropertiesofmaterialsinthisband,whichwasmostlyunexplored.Inthispaper,wepresentabriefintroductiontotheoperationprinciplesofthesedevices.Subsequently,wepresentareviewofthecurrentstate-of-the-artinthisfieldanddiscussthechallengestobefacedinfuturedevelopmentofthesedevices.

简介：Radiationsimulationutilizingplasmaradiationsources(PRS)generatesalargenumberofundesirabledebris,whichmaydamagetheexpensivediagnosingdetectors.Anultrafastshutter(UFS)drivenbypulsedhighcurrentcanerectaphysicalbarriertotheslowlymovingdebrisafterallowingthepassageofX-rayphotons.TheUFSconsistsofapairofthinmetalfoilstwistingtheparallelaxesinaNyloncassette,compressedwithanoutermagneticfield,generatedfromafastcapacitorbank,dischargingintoasingleturnloop.Atypicalcapacitorbankisof7.5μFchargingvoltagesvaryingfrom30kVto45kV,withcorrespondingcurrentsofapproximately90kAto140kAanddischargingcurrentperiodsofapproximately13.1μs.Ashutterclosingtimeasfastas38microsecondshasbeenobtainedwithanaluminiumfoilthicknessof100micrometersandacross-sectionalareaof15mmby20mm.Thedesign,constructionandtheexpressionsofthevalve-closingtimeoftheUFSarepresentedalongwiththemeasuredresultsofvalve-closingvelocities.

简介：Thebandwidthandthedurationofincidentpulsedbeamareprovedtoplayimportantrolesinmodifyingthenonlinearimageofamplitude-typescatterer.Itisfoundthattheinitiallypositivechirp-typebandwidthcansuppressthenonlinearimage,whilethenegativeonecanenhanceit,andthatbotheffectsareinverselyproportionaltotheincidentpulseduration.Numericalsimulationsfurtherdemonstratethatthelocationofnonlinearimageisattheconjugateplaneofthescattererandthat,fornegativelypre-chirpedpulsedbeam,thenonlinearimagepeakintensitycanbehigherthanthatinthecorrespondingmonochromaticcaseundercertainconditions.Moreovertheeffectofgroupvelocitydispersiononnonlinearimageisfoundtobesimilartothatofchirp-typebandwidth.

简介：无

简介：Apulsedcurrentisintroducedintothetraditionalcoaxiallasercladdingprocesstodecreasetheporosityofthecladdinglayer.Themagnetocontractionforcecausedbypulsedcurrentexertedonthemoltenpoolsqueezesthegasoutandcompensatestheshrinkageduringmoltenpoolsolidification.Asaresulttheporosityofthecladdinglayerisdecreasedtoanextremelylowdegree.Simultaneously,thegrainofthecladdinglayerisfinerwiththeaddedsupercoolingdegreewithpulsedcurrent.Themicrohardnessofanequiaxedzoneinthecrosssectionofacladdinglayeralsoincreases.

简介：Inthepaper,theWKBZnormalmodeapproachhasbeenappliedtothepropagationofthepulsedenergyandwaveforminoceanchannels.Thenumericalresultsintwodifferentchannelsaregiven.ComparisonbetweentheWKBZandconventionalnormalmodecodesshowsthattheWKBZmodeapproachisafastandaccuratemethodandtherunningtimebytheWKBZapproachisreducedbyabouttwoordersofmagnitude.

简介：Influenceofpulsedpowertransmissiononradiowaveenvironmentisinvestigated.Thepowerpulsesaretransmittedintermittentlyinpulsedpowernetworkthatisalreadyproposedforanalternativeofupcomingsmartgrids.Incontrasttoconventionalpowertransmissionwithcontinuouselectriccurrentoflowfrequencysinewave,pulsedpowertransmissionmayaffectsurroundingfieldwithhighfrequencyradionoises.Inthispaper,basedontheanalysisofelectricfieldstrengtharoundapowerline,theradionoisesgeneratedbyvariousformsofpulsedpowertransmissionareevaluated.Asaresult,twopointsarederived.First,thoughthetotalofgeneratedradionoisepowerobviouslyexceedsthatofconventionalpowertransmissions,peakstrengthofelectricfieldratherfallsbehindtheconventionalone.Second,concerningtheinfluenceontheradiowaveofthelowestfrequency40kHzthatisactuallyusedforstandardtimeandfrequencysignal,thenoiseintensitypossiblyexceedstheweakradiosignaltoleranceaccordingtotheshapeofeachpowerpulsetransmitted.

简介：Microplasmasareveryinterestingduetotheiruniquepropertiesandachievableregimesmaintainedatatmosphericpressures.Duetothesmallscales,numericalmodelingcouldcontributetotheunderstandingofunderlyingphenomenaasitprovidesaccesstolocalparameters—andcomplementsexperimentalglobalcharacteristics.Aself-consistentformalism,appliedtonanosecondpulsedatmosphericnon-equilibriumheliumplasmas,revealsthatseveralsuccessivedischargescanpersistasaresultofacombinedvolumeanddielectricsurfaceeffects.Thevaluableinsightsprovidedbythespatiotemporalsimulationresultsshowthecriticalimportanceofcoupledgasandplasmadynamics—namelygasheatingandelectricfieldreversals.

简介：VisualimagesensorisdevelopedtodetecttheweldpoolimagesinpulsedMIGwelding.Anexposurecontroller,whichiscomposedofthemodulesofthevoltagetransforming,theexposureparameterspresetting,thecomplexprogrammablelogicdevice(CPLD)basedlogiccontrolling,exposuresignalprocessing,thearcstatedetecting,themechanicalirisdrivingandsoon,isdesignedatfirst.Then,avisualimagesensorconsistsofanordinaryCCDcamera,opticalsystemandexposurecontrollerisestablished.Theexposuresynchroniccontrollogicisdescribedwithvery-high-speedintegratedcircuithardwaredescriptionlanguage(VHDL)andprogrammedwithCPLD,todetectweldpoolimagesatthestageofbasecurrentinpulsedMIGwelding.Finally,bothbeadonplateweldingandVgroovefilledweldingarecarriedout,clearandconsistentweldpoolimagesareacquired.

简介：Anexperimentalinvestigationofananosecondpulseddielectricbarrierdischargeinatmosphericairispresented.Inthesetupaquartztubewasinsertedbetweentheconeandplaneelectrodesinthedirectionparalleltotheelectricfield.Itwasshownthattheappearanceandpropertyofthedischargeweresensitivetothesizeandthepositionofthequartztube.Whenthetubewasplacedonthegroundedplaneelectrode,thedischargeintensitywasfoundtoimprovegraduallywiththeincreaseinthediameterofthequartztube.Furthermore,withanappropriatedistancebetweenthebottomedgeofthequartztubeandtheplaneelectrode,thedischargetendedtoexhibitbetterperformanceingeneratinghomogeneousdiffusiveplasma.Thepossiblemechanismisdiscussed.

简介：Inthispaper,spatiallyangularmultiplexingtechniqueinpulseddigitalholographyandanopticalsystembasedonthistechniqueareintroduced.Opticalsimulationandcalculatinganalysisshowthatthedesignedsystemcanbeemployedtorecordultra-fasteventsofatimeresolutioninnanosecond.

简介：Onthehypothesisthattheturbulentflowispracticallynotaffectedincharacterbypulsationoftheflow,theformulaforsoundpressurelevelofpulsedjetnoiseisobtainedin90°directionand1meterawayfromthenozzle.Thesteadyjetnoiseis,then,aspecialcasewhenthepulsatingfrequencyiszero.Theresultsagreewellwithexperiments.

简介：Laserdriversareanenablingfactortoinertialconfinementfusion,becauselaserdiodesmustbeusedinsteadofflashlamps.Wediscussthelimitationsoflaserdiodearraysandshowwhatstepstheindustryistaking.Thepumppowerrequirementsoflarge-scaleprojectssuchasLIFEorHiPERarewithinreachofsemiconductorlaserdiodeassemblies.Pulsedlightoutputpowersperlaserbarshavebeenaround300Wperbar,asintheJenoptik940nmbarspreviouslyusedforpumpingtheYb:YAGslabsintheDiPOLEproject.Byredesigningthesemiconductorlaserstructures500Wperbarisnowcommerciallyavailablefor808,880and940nmpumpwavelengths.Theconstructionofoneinertialfusionpowerplantwillrequireanamountofsemiconductorlaserchipsinexcessofthecurrentannualproductionbytwoordersofmagnitude.Thisaddstotheengineeringtaskofimprovingthedevicecharacteristicsachallengetoproductioncapacity.Whiletheindustrybenefitsfromtherecentboostinsolid-statelightingthatactsasatechnologydriver,cooperationbetweenmanufacturerswillbeimperative,andtothisendweproposestandardizationefforts.

简介：Thetenacityofheat-affectedzone(HAZ)willdeclineandthesizeofgrainswillincrease,becauseoftheoverheatingonHAZwhensubmergedarcwelding(SAW)isusedtothickplatewithhighheatinput.TheshapingwillworsenwhenSAWisusedtothinplatewithhighcurrentathighspeed.AnewSAWtechnology,thepulseddirectcurrent(DC)automaticSAW,willbeputforwardinthispaperinordertoovercometheaboveshortcomings.Andapulsedcontrollerwithmicro-controllerunit(MCU)asthecore,nixietube(NT)andkeyboardastheman-machineconversationinterfaceisdeveloped.Themainfunctionsofthepulsedcontrollerincludetheoutputofpulsedweldingcurrentandtheworkingwithtwinwire.Theresearchhaswidelyprospectsinapplicationwithsignificantmeaningsintheoryandpracticalengineering.

简介：Objective:Thispaperaimstodesigningapulsedstrongmagneticfieldsgenerator.Methods:Alargevaluecapacitorwasusedtostoreelectricenergy,coilwasusedforproducingmagneticfields,maincontrol,circuitcontrolcharge,sampling,discharge,etc.Results:Thegeneratorprovidedapulsedmagneticfieldwiththeamplitudeofintensityfrom0.1-2Tandvariabletimeintervalofpulsefrom4s-1min.Itwasnotonlytobeoperatedeasilybutalsoperformedreliably.Conclusion:Thegeneratorwillbeappliedinspecialclinicaldiagnosis,therapyandotherfields.