简介:微软在PDC大会上透露了更多DX10的情况,在DX10当中,3D功能被限制在D3D的版本号上,不同版本号的D3D有不同的3D功能,微软试图借此来控制NVIDIA和ATL等图形芯片开发商。Dx10当中GPU将和现在的CPU一样,让多个3D应用程序同时共享GPU的3D渲染资源,这是目前Windows无法办到的。DX10向下兼容DX6/7/DirectDRAW,Vista将集成Direct3D9的扩展,名称是D3D9Ex。D3D9Ex/D3D10可以共享资源,因此安装驱动程序之后不必重启系统,D3D9Ex/D3D10会让显卡重启,将驱动程序和系统其他部分隔离,另外Vista显示驱动程序模式(VDDM)也提升了驱动程序的稳定性……
简介:本文首先给出integralfromato+∞f(x)dx收敛≠lim+∞f(x)=0的一更强的例子,然后给出一个与级数收敛的必要条件类似的,integralfromato+∞f(x)dx收敛的必要条件。在许多工科高等数学教材中,广义积分敛散性的判别,一般都在级数中讨论,因而一部分同学和个别教师往往把级数的一些重要性质,直接推广到广义积分integralfromato+∞f(x)dx上。最典型的错误是把级数收敛的必要条件推广到广义积分上,即integralfromato+∞f(x)dx收敛?lim?+∞f(x)=0.这类错误较为普遍。
简介:随着越来越多经典DX9游戏的问世,支持DX9的显卡越来越多地被PC用户所接受。在入门级的DX9应用中,GeForceFX5200显卡能够满足大多数的应用,占据了显卡市场的重要份额,而不少挑剔的玩家希望能够有一款效能更高的DX9显卡。可是随着GeForceFX5600和FX5600XT逐渐淡出市场,大家迫切需要一款替代GeForceFX5600XT的显卡。
简介:Effectsofself-coilingoforganicmoleculesonintramolecularexciplexformationofcompoundI,inwhichthecarbazolechromophoreandterephthalicacidmethylesteracceptorgrouparelinkedbyone(CH2)10chain,andthedecreaseofthefluorescenceintensitiesofcompoundsⅡ,Ⅲ,andⅣ,inwhichthecarbazolechromophoreand3,5-dinitrobenzoateareconnectedbyonealiphaticchainof(CH2)10(Ⅱ),(CH2)12(Ⅲ),or(CH2)4(Ⅳ),havebeenstudiedinthedioxane(DX)-H2Obinarysystem.Theresultsshowthatself-coilingoforganicmoleculesinDX-H2OfacilitatesintramolecularexciplexformationofIandinducesthedecreaseoffluorescenceintensitiesofⅡ,bacauseoftheproximityeffectbroughtaboutbyselfcoilingoforganicmoleculesunderhydrophobic-lipophilicinteraction(HLI)betweentheexcitedcarbazolechromophoreandtheacceptor.SincethesimilareffectsareobservedevenwhentheconcentrationoftheprobesarelessthantheirCAgCs(criticalaggregateconcentrations)intheDX-H2Omixturewiththesameφvalues,formationoftheintermolecularexciplexhasbeenexcluded.Theeffectsarefoundtobestronglydependedonφvalues,indicationthattheyaremainlydrivenbyHLI.Thepropertiesoftheacceptorscanalsoaffecttheintramolecularexciplexformation.Withterephthalicacidmethylestermoietyastheacceptor,thecarbazolechromophoreexhibitsthefluorescencespectraoftheexciplex,whilewith3,5-dinitrobenzoatemoietyastheacceptor,onlythefluorescencespectraofexcitedcarbazolylchromophoreareobserved.