高等院校成人教育管理略论

成人教育的发展对提高全民素质 ,促进社会进步有重要的作用。高等学校的成人教育如何更好的为社会主义经济文化建设服务 ,关键是教育质量 ,加强成人教育质量的管理是提高成人教育质量的关键。     

微小型机器人的新型步行机构--柔铰五杆机构

基于微小机械设计的一体化思想，通过分析五杆机构在小范围运动状态下近似线性的传动特性，把平面多自由度的闭链五杆机构和易于实现尺寸生小型化的柔性铰链结合在一起，提出了一种柔铰五杆机构。给出了这一机构的设计理论和方法，并应用到微小机器人的步行机构上，对其进行了仿真验证。结果表明，这一步行机构是可行的。     

试谈政治体制改革与权力的制衡机制

随着经济体制改革的不断深入 ,我们必须同时进行政治体制改革。我国的政治体制改革在坚持共产党领导和社会主义制度不变的前提下 ,其目标是进一步加强和改善党的领导 ,建立合理的权力制衡机制 ,建立社会主义民主政治     

BrONO2与Cl(2P3/2)的反应机理

采用密度泛函理论(DFT)B3LYP方法,在6-31G*基组下,研究了Cl(2P3/2)+BrONO2→BrCl+NO3和Cl(2P3/2)+BrONO2→Br+ClONO2的反应机理.计算得到各可能反应途径的过渡态,并通过内禀反应坐标(IRC)分析加以证实.反应Cl(2P3/2)+BrONO2→BrCl+NO3有两种可能的反应途径,其活化能垒相差比较大.途径I和途径II的活化能垒分别为89.5 kJ*mol-1和61.2 kJ*mol-1,该反应为放热反应,放出的热量为73.4 kJ*mol-1.反应Cl(2P3/2)+BrONO2→Br+ClONO2的活化能垒为47.8 kJ*mol-1,该反应为吸热反应,吸收的热量为6.3 kJ*mol-1,这与大部分实验者的推论相一致.反应Cl(2P3/2)+BrONO2→Br+ClONO2的活化能垒比较低,为47.8 kJ*mol-1,认定反应容易进行.反应Cl(2P3/2)+BrONO2→BrCl+NO3途径II的活化能垒低,主要按途径II的反应途径进行.     

略谈知识经济时代高校图书情报事业的发展

论述了知识经济与高校图书情报事业的关系，阐述了知识经济时代高校图书情报事业所面临的机遇与挑战，提出高校图书情报部门必须实行改革以适应新时代的要求的观点。     

The reaction of acenaphthene with nitrobenzene

The reaction of acenaphthene with nitrobenzene was investigated in the presence of AlCl₃. The results showed that the reaction proceeded via carboncation-electrophilic substitution reaction and free radical substitution reaction pathway. The products of acenaphthenyl phenylamine and biacenaphthyl could be synthesized by this reaction. The influence of the amount of AlCl₃ and the temperature on the components of products were also studied in this reaction. Foundation item: Supported by the National Nature Science Foundation of China (No. 29676045) Biography: Wu Lin (1965-), male, Postdictor, research direction: PAHs catalytic conversion and its biologic toxicity.     

Investigation for Electromechanical Coupling Unstability of Rolling Mill

The unsteady condition of rolling Mill vibration that was caused by flexural vibration of strip was investigated. The parametric flexural vibration equation of rolled strip was established. The parametric flexural vibration stability of rolled strip was studied and region of stability and unstability was determined based on Floquet theory and perturbation method. The flexural-vibration of strip was unstable if the frequency of variable tension was twice as the natural frequency of flexural-vibration strip. ...     

Unsteady-State Grinding Technology (I) Theoretical Generalization and Research on Grinding Mechanism

In conventional grinding theory, it is obvious that there must be a very high hardness difference between grains of the grinding wheel and workpieces. The best grinding wheels are those giving the lowest “natural limiting surface roughness“ while cutting at appreciable plunge velocities. With the development of new materials and new machining processes, conventional theories of grinding techniques are no longer suitable to explain many phenomena in the course of grinding procedures. In dealing with precisio...     

汞的生物毒性及其防治策略

汞是一种剧毒环境污染物。汞与生物大分子上的活性点结合,使其失去活性,导致病变。     

关于Rn上函数f(x)的极值存在定理

在gj(x)=0和gj(x)≥0　(j=1,2,…,m)的约束条件下分别给出了定义在Rn上的函数f(x)极大值存在的若干定理。