用投影法测量显微镜的数值孔径

介绍了投影法测量显徽镜数值孔径的实验原理，并给出了测量结果．     

Novel Photo-induced Coupling Reactions of 9-Fluorenylidenemalononitrile or 1,1-Diphenyl-2,2-dicyanoethylene with 10-Methyl-9,10-dihydroacridine. A Study on the Photophysics of the Reaction

IntroductionItwasreported1thatnovelphoto inducedcouplingre actionof 9 fluorenylidenemalononitrile (FDCN )with 10 methyl 9,10 dihydroacridine (AcrH2 )tookplaceviaanelectrontransfer protontransfer radicalcouplingpathwaytogive 9 dicyanomethyl 9 (10′ methyl 9′ acridinyl)fluo rene (1) (Scheme 1) .Similarly ,thephoto inducedreac tionof 1,1 diphenyl 2 ,2 dicyanoethylene (DPCN )withAcrH2 alsoproducedacouplingproduct .2 Thesereactionsareratherscarcewithreducednicotinamideadeninedinu cleotide …     

听阈曲线探究性实验

利用实验室现有的简单设备组成实验装置，测定了正常的听阈曲线、有噪声干扰时的听阈曲线、分散注意力时的听阈曲线．