简介:WereportanenhancementcavityforfemtosecondTi:sapphirelaserattherepetitionrateof170MHz.Anenhancementfactorof24isobtainedwhentheinjectingpulseshaveanaveragepowerof1Wandapulsedurationof80fs.ByplacingaBBOcrystalatthefocusofthecavity,weobtaina392-mWintracavitydoubled-frequencylaser,correspondingtoaconversionefficiencyof43%.Theoutputpowerhasalong-termstabilitywitharootmeansquare(RMS)of0.036%.
简介:Vanadiumalloys(V-Cr-Tiseries)areimportantcandidatematerialsforblanketcomponentsoffusionreactorsduetotheirlowactivationandhighstrengthatelevatedtemperatures.Low-temperatureirradiationembrittlementdeterminestheoperationtemperaturelimitofVanadiumalloysfortheapplicationtostructuralmaterialsoffusionreactorsirradiationresponseofvanadiumalloysneedstobeclarifiedfortheirapplication.Inthepresentstudy,specimensoftwoalloys(V-4Cr-4TiandV-5Cr-5Ti)wereirradiatedwithenergeticHeionsandheavyionstounderstandhardeningofthealloysduetoheliumaccumulationandcascadedamageproduction.
简介:以SCI数据库中Scientometrics2000~2014年期间刊载的2415篇论文为研究对象,采用文献计量学的方法,从载文量、被引情况、合作情况、核心作者、研究热点等几个角度进行分析,同时对中国作者发表的论文进行重点分析。研究结果表明,中国的发文量逐年上升,2011~2014年一直排在第一,但是总被引次数以及篇均被引次数都偏低,合作论文以国内合作为主,国际合作比例偏小,主要的合作国家有美国、比利时等。
简介:Theelectronbeamwelding-brazingbeingusedtojoin5A06AlalloytoTC4Tialloydecreasestheformationofbrittleintermetalliccompound.Experimentswerecarriedouttostudytheinfluenceofelectronbeamweldingparametersonthetensilestrengthofwelds,basedonanorthogonaltestandanalysismethod.Theweldingparametersincludebeamcurrent,weldingspeed,scanningfigure,scanningfrequency,figuresize,beamoffsetandfocuscurrent.Theoptimumparametersfor3mm5A06Alalloyand2mmTC4alloywereasfollows:accelerationvoltagewas60kV,beamcurrentwas11mA,weldingspeedwas600mm/min,focuscurrentwas0mA,scanfigurewasO,scanningfrequencywas1000Hzandbeamoffsetwas0.5mm.Theresultsshowthatthejointswerewithgoodappearanceandqualityweldedbytheoptimumparameters.ThesuccessfuljointscouldbegainedandthemaximumtensilestrengthofAl/Tidissimilaralloyjointscouldbeupto222.61MPausingelectronbeamwelding-brazing.
简介:微结构和电子横梁的机械描述焊接了伪造Ti-6Al-4V的关节被调查。Microhardness测试显示熔化地区(FZ)的坚硬比影响热的地区(HAZ)和贱金属的高。张力的结果证明焊接关节的机械性质以静态的力量与贱金属的那些是可比较的并且根据在微观结构和焊接关节的机械性质之间的关系。焊接的最终的张力的强度等于时漏关节的,它显示横向的FZ的纵的FZ和那些的机械性质是一样。基础材料,关节,和焊接标本的Macromechanical行为和macrofracture和microfracture被观察。在标本破裂现象的三种类型之中的比较揭示下列特殊差别:(1)破裂模式,(2)在中央区域的酒窝模式的显微图,并且(3)在中央区域和转变区域的酒窝的尺寸。
简介:CaTiO3的形成行为在钛铁矿的electro-deoxidization期间专注准备FeTi合金被实验和模拟调查。结果显示中间的产品的形成和分解,CaTiO3,在钛铁矿的electro-deoxidization期间是不可避免的步专注。CaTiO3能在电气化学的过程期间通过熔融的盐和电气化学反应的hydrolyzation被产生。为CaTiO3的产生的主要原因在阴极是在从熔融的盐和TiO2的Ca2+之间的电气化学反应。与electro-deoxidization继续,CaTiO3是进一步的electrolyzed形成钛低值氧化物。当在由在sintering期间增加CaCO3的阴极的CaTiO3形式处理时,当前的效率能被改进。
简介:Toimprovetheharvestingofvisiblelightandreducetherecombinationofphotogeneratedelectronsandholes,Ti3+self-dopedTiO2nanoparticlesweresynthesizedandassembledintophotoanodeswithhighvisiblelightphotoelectrochemicalproperties.X-raydiffraction,transmissionelectronmicroscopy,X-rayphotoelectronspectra,electronresonancespectroscopyandenergydispersiveX-rayspectrawereusedtocharacterizethestructure,crystallinity,morphologyandotherpropertiesoftheobtainednanoparticles.UV–visiblediffusereflectancespectrashowedthattheTi3+self-dopedTiO2nanoparticleshadastrongabsorptionbetween400and800nm.Moreover,whenhydrothermaltreatmenttimewasprolongedto22h,theheterogeneousjunctionwasformedbetweentheanataseandrutileTiO2,wheretheanataseparticlesexposedhighlyactive{001}facets.Undervisiblelightirradiation,theTi3+self-dopedTiO2electrodeexhibitedanexcellentphotoelectrocatalyticdegradationofrhodamineB(RhB)andwatersplittingperformance.Intriguingly,byselectinganappropriatehydrothermaltime,thehighphotoconversionefficiencyof1.16%wasachieved.