用等厚干涉测定液体折射率

介绍一种采用等厚干涉原理测定液体折射率的简单可靠的方法。     

直线与平面(选择题五题)

1.“两条平行线确定一个平面”,此命题可分开看作 (A)半定理,半推论 (B)半推论,半定义 (C)半定义,半公理 (D)半公理,半定理     

幂指对函数一例

题 下列函数,在区间[0,1]上为减函数的是( )     

基于低功耗双边沿D触发器的任意进制异步计数器设计

从D触发器激励表入手，分别给出了采用单边沿D触发器和双边沿D触发器的2^n进制异步加法计数器、减法计数器的设计方法．在此基础上，采用逻辑函数修改技术，通过实例讨论了基于单边沿D触发器和双边沿D触发器的异步任意进制计数器的设计．该设计方法方便，快速，具有一定的实用意义．     

(七) 复数

[分析] |z|=2的图形是个圆,|z＇ i|=2的图形也是一个圆。问题化为求后一个圆上离原点最远的点的距离。     

KNbO3：Fe晶体的时间微分效应及图像追踪

本文观察到了KNbO_3:Fe晶体的时间微分效应,并用这个微分效应进行了图像追踪的演示,为KNbO_3:Fe晶体在光折变器件领域的应用进行了有益的探索。     

LIQUID CHLOROPRENE-HYDROXYETHYL METHACRYLATE COPOLYMER MODIFIED EPOXY RESIN Ⅱ. N, N-DIMETHYL BENZYL AMINE CURING SYSTEM

A series of liquid chloroprene-hydroxyethyl methacrylate copolymer (CP-HEMA) modifiedepoxy resin were prepared. The effects of CP-HEMA content, curing conditions on physical pro-perties of the modified system were examined. With IR and Viscoelastocuremeter, the curing reactionrate was determined and the mechanism of the curing reaction was discussed. The effects of CP-HEMA content and curing conditions on morphology were mainly observed by scanning electronmicroscopy.     

修饰剂结构对桥氧双核锰2，2＇－联吡啶配合物电化学的影响

修饰剂结构对桥氧双核锰２，２＇－联吡啶配合物电化学的影响吴丛笑，郑军伟，陆天虹（中国科学院长春应用化学研究所电分析化学开放实验室，长春，１３００２２）关键词桥氧双核锰２，２＇－联吡啶配合物，烟酸，异烟酸，２－羧酸吡啶锰酶在生物体系中作为一类重要的氧化...     

POLYURETHANE-POLYSTYRENE INTERPENETRATING NETWORKS

A series of polyurethane based on liquid chloroprene-hydroxyethyl methacrylate copolymer(CP-co-HEMA)-polystyrene (PS) interpenetrating polymer networks (PU-PS IPN) were synthe-sized. Some physical properties were examined and density behavior was investigated. In 60%polyurethane (PU) system, the tensile strength and density increased greatly. Transmission electronmicrographs showed that the phase separation existed and the sizes of PS domains dispersed in PUphase were about 500-4,000 A. In comparison with correlative PU-PMMA IPN system, whichhas the higher compatibility, this system showed an extensive phase separation and clear boundaries.There was no phase inversion observed even for 60% PU system in which PS was still the dispersed phaseand PU the continuous phase. This was due to the relatively faster rate of formation of PU than thatof ST polymerization.     

线型碳链LiC_(2n)Li的结构和电子光谱的密度泛函理论研究

应用密度泛函理论,在B3LYP/6 31G(d)水平上优化得到了线型簇合物LiC2nLi(n=1 ~10,D∞h)的基态平衡几何构型,并计算了它们的谐振动频率.利用含时密度泛函理论,计算了簇合物LiC2nLi的X1∑ +g→11∑ +u跃迁的垂直激发能,以及相应的振子强度.基于计算结果,建立了跃迁能和体系大小n的解析关系式. 同时也计算了体系的第一绝热电离能,讨论了体系的电离能与体系大小n的关系.