简介:刚参加工作时,我在矿工会的主要工作之一就是为俱乐部放电影。上世纪80年代什么资源都紧张,遇到好片子几个影院串片轮流放映是常有的事,每次当我准备打出“跑片未到,敬请原谅”的幻灯片时,摩托车便伴随着发动机声呼啸而至,真是帮了大忙!
简介:TwoArmijo-typelinesearchesareproposedinthispaperfornonlinearconjugategradientmethods.ThetwoArmijo-typelinesearchesareshowntoguaranteetheglobalconvergenceoftheDYmethodfortheunconstrainedminimizationofnonconvexdifferentiablefunctions.Further,ifthefunctionisstrictlyconvex,thetwoArmijo-typelinesearchesandanotherArmijo-typelinesearcharealsoshowntoguaranteetheconvergenceoftheDYmethod.
简介:设D是无平方因子正整数.本文证明了:当D不能被形如6k+1之形素数整除时,方程,-1=Dyn仅当D=17时有正整数解(x,y,n)=(18,7,3)适合n>2.
简介:ThecyclicvoltammetryandpotentiostaticelectrolysiswereusedtoinvestigatethepreparingofDy-BialloyfilmsinLiCl-DMSO(dimethylsulfoxide)system.Theeffectsofseveralfactorsincludingthepotentialofdeposition,concentrationsofmainsalts,andtheconcentrationratioofDyCl3toBi(NO3)3werestudied.Dy-Bialloyfilmscontaining4.82%-80.62%(massfraction)dysprosiumwerepreparedinDyCl3-Bi(NO3)3-LiCl-DMSOsystembycontrollingthesystemcompositionanddepositionconditions.Thefilmsaregray,uniform,metalliclusterandadherefirmlytothecoppersubstratesanalyzedbySEM(scanningelectronmicroscope),EDS(X-rayenergydispersiveanalysis),andXRD(X-raydiffraction).Afterheattreatmentat718Kforlh,thealloyphaseofDy-BiwasfoundinXRDpatterns.
简介:StudyonGdAlDySystemMagneticRefrigerationMaterialsChangXiumin,YanJunlian(常秀敏)(闫俊联)BeijingGeneralResearchInstituteforNonferr...
简介:设D为奇素数,运用同余式、平方剩余等初等方法得出了Diophantine方程x3-53=Dy2无正整数解的一个充分条件。