简介:ThelasersystemPALS,asadriverofabroad-beamionsource,delivereddeuteronswhichgeneratedneutronswithenergieshigherthan14MeVthroughthe7Li(d,n)8Bereaction.Deuteronswithsub-MeVenergywereacceleratedfromthefrontsurfaceofamassiveCD2targetinthebackwarddirectionwithrespecttothelaserbeamvector.Simultaneously,neutronswereemittedfromtheprimaryCD2targetandasecondaryLiFcatcher.Thetotalmaximummeasuredneutronyieldfrom2D(d,n)3He,7Li(d,n)8Be,12C(d,n)13Nreactionswas~3.5(±0.5)×108neutrons/shot.
简介:本文介绍了高压变频器在圭山煤矿主井提升机中的应用情况。对原矿井提升机系统作简要介绍,并对高压提升变频调速系统性能、安装、改进作了论述,运行效果表明改造是成功的。
简介:Asanimportantmulti-functionalmaterialappliedinsurfaceacousticwavedevices,opticalcommunications,laserandoptoelectronicsduetoitsgoodphotoelectricandpiezoelectricproperties,lithiumtantalate(LiTaO3)hasdrawnextensiveinterests[1].NumerousphysicalpropertiesofLiTaO3,suchasacoustical,electronicstructures,opticalpropertiesandeffectivemass,thermodynamicproperties,havebeenreportedinseveralpapers.Pointdefectswillaffecttheelectronicstructurewhichshouldberesponsibleformanyphysicalproperties,especiallyopticalproperties.
简介:1智力图形观察左边三个图,你能找到其中的规律,并根据这个规律,猜出右边问号中的图形吗?2实习侦探集市上一名小偷在偷钱包的时候,被一位年轻的巡警发现了。警察大喊:"住手!"小偷吓得一惊,一看是警察撒腿就跑。警察在后面追,小偷拼命逃跑,两人速度都很快。他们一前一后穿过两个十字路口,跑过五条长街。小偷看没有办法摆脱警察,情急之下就钻进一家塑料模特仓库。警察也跟着跑进仓库。仓库很大,有穿着各种各样衣服的模特,在昏暗的灯光下,这些模特都如同真人一般。警察看不出哪个是塑料模特儿.哪个是小偷。