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简介：ThepurificationprocessoftotalflavonesofginkgoleavesbyresinHZ-841fromethanolextractwasstudied.First,thetotalflavonewasextractedfromthedefattedpowderofginkgoL.bilobaleaves.Effectsofsolventsandoperationconditionswereexaminedtogetarelativehighyieldandpurityinthisstep.ThecrudeextractwasfurtherpurifiedbyresinHZ-841.Bothadsorptionandelutionprocesswerestudiedtoobtainanoptimizedconditions,i.e.,pH,flowrate,concentration.Ayellowpowderwasobtained,ofwhich37.3%wasflavones,obviouslyhigherthanthebasicinternationalstandardof24%.

简介：Ａ　Ｈｏｔ　Ｇｉａｎｔ　Ｄｉｐｏｌｅ　Ｒｅｓｏｎａｎｃｅ　ｉｎ　２５　ＭｅＶ／ｕ　４０Ａｒ＋１１５Ｉｎ　ＲｅａｃｔｉｏｎｓＡＨｏｔＧｉａｎｔＤｉｐｏｌｅＲｅｓｏｎａｎｃｅｉｎ２５ＭｅＶ／ｕ４０Ａｒ＋１１５ＩｎＲｅａｃｔｉｏｎｓ￥Ｄ...

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简介：Wereportonatargetsystemsupportingautomatedpositioningofnano-targetswithaprecisionresolutionof4μminthreedimensions.Itreliesonaconfocaldistancesensorandamicroscope.Thesystemhasbeencommissionedtopositionnanometertargetswith1Hzrepetitionrate.Integratingourprototypeintothetable-topATLAS300TW-lasersystemattheLaboratoryforExtremePhotonicsinGarching,wedemonstratetheoperationofa0.5Hzlaser-drivenprotonsourcewithashot-to-shotvariationofthemaximumenergyabout27%foralevelofconfidenceof0.95.Thereasonoflasershootingexperimentsoperatedat0.5Hzratherthan1Hzisbecausethesynchronizationbetweenthenano-foiltargetpositioningsystemandthelasertriggerneedstoimprove.

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简介：Inthispaper,weshowthatapositiverecurrentuidqueueisautomaticallyV-uniformlyergodicforsomefunctionV≥1butneveruniformlyergodic.Thisrevealsasimilarityofergodicitybetweenafluidqueueandaquasi-birth-and-deathprocess.AsabyproductofV-uniformergodicity,wederivecomputableboundsontheexponentialmomentsofthebusyperiod.

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简介：Inthispaperwereviewthedesignanddevelopmentofa100J,10Hznanosecondpulsedlaser,codenamedDiPOLE100X,beingbuiltattheCentralLaserFacility(CLF).This1kWaveragepowerdiode-pumpedsolid-statelaser(DPSSL)isbasedonamasteroscillatorpoweramplifier(MOPA)design,whichincludestwocryogenicgascooledamplifierstagesbasedonDiPOLEmulti-slabceramicYb:YAGamplifiertechnologydevelopedattheCLF.Thelaserwillproducepulsesbetween2and15nsindurationwithprecise,arbitrarilyselectableshapes,atpulserepetitionratesupto10Hz,allowingreal-timeshapeoptimizationforcompressionexperiments.Oncecompleted,thelaserwillbedeliveredtotheEuropeanX-rayFreeElectronLaser(XFEL)facilityinGermanyasaUK-fundedcontributioninkind,whereitwillbeusedtostudyextremestatesofmatterattheHighEnergyDensity(HED)instrument.

简介：TheV^t-integralasdefinedin[2],whichiseqnivalenttoM^2-integrslasdefinedinTrigonometreseriesbyZygmundisusedtosumtrigonometricseiesin[1].Inthispaper,someconvergenttheoremsofV^2-integralareestablished.

简介：Ｒｏｔａｔｉｏｎ　ｉｎ　Ｒｅａｃｔｉｏｎ　１９Ｆ＋５１ＶＲｏｔａｔｉｏｎｉｎＲｅａｃｔｉｏｎ１９Ｆ＋５１Ｖ￥ＷａｎｇＱｉ；ＬｕＪｕｎ；ＸｕＨｕｓｈａｎ；ＬｉＳｏｎｇｌｉｎ；ＺｈｕＹｏｎｇｔａｉａｎｄＺｈａｎｇＹｕｈｕＩｎｄＬｓｓｉ...

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简介：γ－ｒａｙ　ｉｎ　２５　ＭｅＶ／ｕ　４０Ａｒ＋１１５Ｉｎ　ａｎｄ　１０３Ｒｈ　Ｆｕｓｉｏｎ－ｆｉｓｓｉｏｎ　Ｒｅａｃｔｉｏｎｓγ－ｒａｙｉｎ２５ＭｅＶ／ｕ４０Ａｒ＋１１５Ｉｎａｎｄ１０３ＲｈＦｕｓｉｏｎ－ｆｉｓｓｉｏｎＲ...

简介：ＳｔｕｄｙｏｎＣｏｒｒｅｌａｔｉｏｎＢｅｔｗｅｅｎＬｉｇｈｔＰａｒｔｉｃｌｅｓａｎｄＦｒａｇｍｅｎｔｓｉｎ２５ＭｅＶ／ｕ４０Ａｒ＋１１５ＩｎＲｅａｃｔｉｏｎ￥ＺｈｏｕＪｉａｎｑｕｎ；ＺｈａｎＷｅｎｌｏｎｇ；ＧｕｏＺｈｏｎ...

简介：本文讨论了三相交流陀螺马达电源的工作原理。根据主要技术指标的要求，设计了陀螺马达电源，给出了该电源的各个组成部分的线路设计，解决了研制中出现的电源振荡问题，论述了该电源的设计特点，给出了使用结论

简介：Wepresenta940nmquasi-continuouswavesemiconductorlaserdesignedasabuildingblockforhigh-powerfibercoupledpumpmodules.Thelasercomprisesa400μmnarrow-stripearraymountedonanaluminumnitridesubstrateusinghardsolder.Thechiphasbeenoptimizedforhighopticalpowerandlowlateralfar-fieldangles.Twoverticalandsixlateralstructurevariationshavebeeninvestigatedtodeterminethebestachievableperformance.Operatingat1mspulsewidthandarepetitionrateof10Hz,thelaserdevicereachesamaximumpulsepowerof86Wfroma400μmapertureandmorethan62%maximumconversionefficiency.Lowlateralfar-fieldangles(95%powerenclosed)of11.5and13.5,dependingontheepitaxialdesign,enableefficientmultimodefibercoupling.Thepotentialforhighlyreliableapplicationshasbeendemonstrated.

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简介：Theeffectofbismuth（Bi）forbothVO2+/VO2+andV3+/V2+redoxcouplesinvanadiumflowbatteries（VFBs）hasbeeninvestigatedbydirectlyintroducingBionthesurfaceofcarbonfelt（CF）.TheresultsshowthatBihasnocatalyticeffectforVO2+/VO2+redoxcouple.Duringthefirstchargeprocess,BiisoxidizedtoBi3+（neverreturnbacktoBimetalinthesubsequentcycles）duetothelowstandardredoxpotentialof0.308V（vs.SHE）forBi3+/BiredoxcouplecomparedwithVO2+/VO2+redoxcoupleandBi3+exhibitno（orneglectable）electro-catalyticactivity.Additionally,therelationshipbetweenBiloadingandelectrochemicalactivityforV3+/V2+redoxcouplewasstudiedindetail.2wt%Bi-modifiedcarbonfelt（2%-BiCF）exhibitsthehighestelectrochemicalactivity.Usingitasnegativeelectrode,ahighenergyefficiency（EE）of79.0%canbeachievedatahighcurrentdensityof160mA/cm2,whichis5.5%higherthanthepristineone.Moreover,theelectrolyteutilizationratioisalsoincreasedbymorethan30%.Eventhecelloperatedat140mA/cm2forover300cycles,theEEcanreach80.9%withoutobviousfluctuationandattenuation,suggestingexcellentcatalyticactivityandelectrochemicalstabilityinVFBs.

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