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简介：Heathandlinghasbeenasignificantproblemofthehighpowerfiberlasersystemsastheoutputpowerincreasesrapidly.Claddingpowerstripper(CPS)whichisusedtodealwiththeunwantedopticalpowerandlightisrequiredforhighercoolingability.Sothemethodsofstrippingtheunwantedlightattractedmuchattentionrecently,andthethermaleffectisgiven.However,fewinvestigationsfocusonthedissipationoftheheatconvertedfromtheunwantedlight.Inthispaper,anapproachofactivecoolingforCPSisdemonstrated.ThisisachievedbyusingmicrochannelcoolingtechnologyinheatsinkinginCPStoimprovetheefficiencyofheatexchange.InordertoexplainthemechanismofCPSthefunctionofitandconsistenceofcategoriesoftheunwantedlightaredetailedfirstly.Thenmicrochannelheatsinkingisproposedandverifiedbytheheatexchangetheory.Atlast,thedesignoftheCPSwithmicrochannelheatsinkingisshownandfollowingexperimentisconducted.Thefinaltemperatureofthedevicewith1000WcladdingpowerwasdemonstratedatlasttoverifytheabilityofheatdistributionoftheCPScomponent.ThissuggeststhattheseCPSscanbeusedtostripeathousandofwattsoflightinhighpowerdoublecladdingfiberlasers.

简介：Atypeofnovelinverterpowersupplysystemforhigh-powertwin-wirepulsedgasmetalarcwelding(GMAW)ispresentedmainlyfordealingwiththedisadvantagesoftheconventionalpowersupplyfortwin-wirepulsedGMAWofwhichtheoutputpowerisgenerallydifficulttoincreaseduetolimitationsofthepowerofsemiconductorsandthepowerdensityofmagneticdevices.Inthepowersuppliesforthemasterandslavearcs,thedigitalsignalprocessor(DSP)TMS320F28335isusedtoformtheDSP-basedsynergiccontrolsystemforparallelhigh-powerpulsedGMAW,whichachieveshigh-poweroutputoftwoparallelinverterscontrolledbyasingleDSP;master-slavecommunicationisachievedbyusingecontrollerareanetwork(eCAN)moduleofDSP,thusrealizinganti-phasepulseoutputofhigh-powertwin-wirepulsedGMAWandreducingtheinterferencebetweentwinarcs.Theexperimentresultsdemonstratethatthedesignedinverterpowersupplysystemforhigh-powertwin-wirepulsedGMAWcanbringabouthigh-powerefficiencyofwelding,stableweldingprocessandproperformationofwelds.

简介：Wepresenttheworkflowofthedesign,realizationandtestingofdeformablemirrorssuitableforhighpowerdiodepumpedsolid-statelasers.Itstartswiththestudyoftheaberrationtobecorrected,andthenitcontinueswiththedesignoftheactuatorspositionandcharacteristic.Inthispaper,wepresentandcomparethreedeformablemirrorsrealizedformulti-Jlevellaserfacilities.Weshowthatwiththesamedesignconceptitispossibletorealizedeformablemirrorsforothertypesoflasers.Asanexample,wereporttherealizationofadeformablemirrorforfemtosecondlasersandforaCWCO2laser.

简介：Whenexposedtointenseelectromagneticfields,thequantumvacuumisexpectedtoexhibitpropertiesofapolarizablemediumakintoaweaklynonlineardielectricmaterial.Variousschemeshavebeenproposedtomeasuresuchvacuumpolarizationeffectsusingacombinationofhigh-powerlasers.Motivatedbyseveralplannedexperiments,weprovideanoverviewofexperimentalsignaturesthathavebeensuggestedtoconfirmthispredictionofquantumelectrodynamicsofrealphoton–photonscattering.

简介：In2016,thepowersupplyinCSRmwasdigitalizedtofurtherimprovethereliabilityofoperation.Anewvectorrecticationtechniqueisdevelopedfortheresearchofadvancedpowersupplyandelectricalrelatedtechnologies.AnumberofEMCandelectricalsafetytestingitemsforHIMMWuweipowersupplieshasbeencompleted.DigitalizationupgradeofthepowersupplyCSRmpowersupply,including30setsquadrupolemagnetpowersupply,6setssextupolemagnetpowersupplyand8setsbipolarcorrectmagnetpowersupply,weretransformedbyusingofdigitalcontrollersbasedonFPGA.Fig.1displaysthemeasurementresultsofthenewdigitalpowersupplyofquadrupolemagnet,thecurrenterror(attop)was1.7610?5,thetrackinger-rorwas5.2810?5.Theperformanceandreliabilityofthepowersupplyhavebeengreatlyimproved.

简介：三桶、四桶近海有转移力量的结构的一种新形式的风力量基础在这被建议纸，和foundation-soil-transition结构的综合有限元素模型被使用ABAQUS建立。建议基础的带的能力在垂直负担，水平负担和弯曲时刻下面被学习。多斗式的基础的垂直适用能力能被垂直适用能力粗略地估计，这能被看见单个桶；三桶的基础计划的水平适用能力被排水量控制，当四桶的基础计划的被土壤的内部力量控制时。而且，带的能力被形成由的全面结构提供在土壤前多斗式失败。与常规单个桶的基础相比，主要有紧张和压力，被用于多斗式的基础，以便基础的带的能力能充分被利用。土壤失败的概率能很好与建议多斗式的基础被减少，并且转移力量的结构的压力传播通过有可变剖面图的钢横梁是更一致的。

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

简介：Alow-thresholdRamaneffectinakilowattytterbium-dopednarrowbandfiberamplifiersystemisreported.TheRamanStokeslightat1120nmisachievedwiththetotaloutputpowerofonly~400W,indicatingthattheRamanthresholdofthiskilowattcodirectionalpumpedcontinuouswavefiberamplifierismuchlowerthanthepredictedvalueestimatedbytheclassicformula.Tofigureoutthemechanismofthisphenomenon,simulationsbasedonthegeneralstimulatedRamanscattering(SRS)modelareanalyzedindicatingthatthekeyfactoristhecouplingbetweenfour-wavemixing(FWM)andSRS.Thesimulationresultsareingoodagreementwithourexperiments.

简介：Wedemonstrateadiode-pumpTm3+t-dopedall-fiberlaseroperatingat1908nmbasedonamasteroscillatorpoweramplifier（MOPA）configuration.Inourwork,152Woflaseroutputpowerisgeneratedbyatotalincidentpumppowerof434Wat790nm,correspondingtothetotalopticalefficiencyof35%.Thelaserwavelengthis1908.29nm.Tothebestofourknowledge,itisthehighestoutputpowerreachedaround1908nmwithsuchanarrowlinewidthof0.18nmbasedonaMOPAconfiguration.

简介：Withthedevelopmentofsmartgrid,residentshavetheopportunitytoscheduletheirhouseholdappliances(HA)forthepurposeofreducingelectricityexpensesandalleviatingthepressureofthesmartgrid.Inthispaper,weintroducethestructureofhomeenergymanagementsystem(EMS)andthenproposeapoweroptimizationstrategybasedonhouseholdloadmodelandelectricvehicle(EV)modelforhomepowerusage.Inthisstrategy,theelectricvehiclesarechargedwhenthepriceislow,andotherwise,aredischarged.Byadoptingthiscombinedsystemmodelunderthetime-of-useelectricityprice(TOUP),theproposedschedulingstrategywouldeffectivelyminimizetheelectricitycostandreducethepressureofthesmartgridatthesametime.Finally,simulationexperimentsarecarriedouttoshowthefeasibilityoftheproposedstrategy.Theresultsshowthatcrossovergeneticparticleswarmoptimizationalgorithmhasbetterconvergencepropertiesthantraditionalparticleswarmalgorithmandbetteradaptabilitythangeneticalgorithm.

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简介：Laser-inducedbreakdownspectroscopy（LIBS）isanemerginganalyticalspectroscopytechnique.ThisreviewpresentsthemainrecentdevelopmentsinChinaregardingtheimplementationofLIBSforcoalanalysis.Thepapermainlyfocusesontheprogressofthepastfewyearsinthefundamentals,datapretreatment,calibrationmodel,andexperimentalissuesofLIBSanditsapplicationtocoalanalysis.Manyimportantdomesticstudiesfocusingoncoalqualityanalysishavebeenconducted.

简介：BEATS作为各大明星时尚潮人御用耳机品牌，对于众多热爱潮流资讯的人来说再熟悉不过，近日推出一批备受期待的最新无线音乐设备来拓展品牌的高端产品，其中包括一款全新推出的无线耳机BeatsX以及现在市面上最畅销的两款耳机的新一代产品Powerbeats3Wireless无线入耳式耳机以及BeatsSolo3Wireless无线头戴式耳机，备受全球乐迷期待。

简介：Thedeformablemirrorwiththesizeof410mmstackswasdeveloped.Theresults×468mmcontrolledbythebimorphpiezoceramicplatesandmultilayerpiezoceramicofthemeasurementsoftheresponsefunctionsofalltheactuatorsandofthesurfaceshapeofthedeformablemirrorarepresentedinthispaper.ThestudyofthemirrorwithaFizeauinterferometerandaShack–Hartmannwavefrontsensorhasshownthatitwaspossibletoimprovetheflatnessofthesurfacedowntoaresidualroughnessof0.033μm(RMS).Thepossibilityofcorrectionoftheaberrationsinhigh-powerlaserswasnumericallydemonstrated.

简介：批评基础结构正在变得对串联失败逐渐地相互依赖、脆弱。存在研究分析了相互依赖的网络的危险到从网络拓扑学结构的静态的观点串联失败。这份报纸开发在力量网络认为负担的动态再分配探索相互依赖的力量水网络的危险的一个更现实主义的串联失败模型。在这个模型，批评忍耐阀值原来被建议显示网络的危险到串联失败。另外，是重要的联网危险的一些关键参数通过数字模拟被识别并且确定。当忍耐参数的值在批评忍耐阀值上面时，结果证明串联失败能被阻止。否则相互依赖的网络在攻击力量节点的批评部分以后崩溃。相互依赖的网络随互相依赖力量的增加变得更脆弱，它暗示保护那些互连的节点减少串联失败的后果的重要性。相互依赖的网络在高负担的攻击下面是很脆弱的，它显示出保护高负担的节点的意义。

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简介：Themasstransportvelocityinathinlayerofmuddyfluidisstudiedtheoretically.Themudmotionisdrivenbyaperiodicpressureloadonthefreesurface,andthemudisdescribedbyapower-lawmodel.Basedonthekeyassumptionsoftheshallownessandthesmalldeformation,aperturbationanalysisisconducteduptothesecondordertofindthemeanEulerianvelocityinanEuleriancoordinatesystem.Thenumericaliterationmethodisadoptedtosolvethesenon-linearequationsoftheleadingorder.Fromthenumericalresults,boththefirst-orderflowfieldsandthesecond-ordermasstransportvelocitiesareexamined.Theverificationsaremadebycomparingthenumericalresultswithexperimentalresultsintheliterature,andagoodagreementisconfirmed.

简介：Thispaperfocusesontheflowcharacteristicandlocalresistanceofnon-Newtonianpowerlawfluidinacurved90°bendpipewithcircularcross-sections,whicharewidelyusedinindustrialapplications.Byemployingnumericalsimulationandtheoreticalanalysisthepropertiesoftheflowandlocalresistanceofpowerlawfluidunderdifferentworkingconditionsareobtained.ToexplorethechangeruletheexperimentiscarriedoutbychangingtheReynoldsnumber,thewallroughnessanddifferentdiameterratioofelbowpipe.ThevariationofthelocalresistancecoefficientwiththeReynoldsnumber,thediameterratioandthewallroughnessispresentedcomprehensivelyinthepaper.TheresultsshowthatthelocalresistanceforcecoefficienthardlychangeswithReynoldsnumberofthepowerlawfluid;thewallroughnesshasasignificantimpactonthelocalresistancecoefficient.Asthepipewallroughnessincreasing,thecoefficientoflocalresistanceforcewillincrease.Themainreasonoftheinfluenceoftheroughnessonthelocalresistancecoefficientistheincreaseoftheeddycurrentregioninthepowerlawfluidflow,whichincreasesthekineticenergydissipationofthemainflow.Thispaperprovidestheoreticalandnumericalmethodstounderstandthelocalresistancepropertyofnon-Newtonianpowerlawfluidinelbowpipes.