交流电路的几个实验

为了使物理教学能更好地为生产服务,更紧密地与生产劳动相结合,在高中物理学电学部分中增加交流电路的知识是完全必要的。欲使学生获得感性认识,并用实验来验证交流电路的理论,我们在教学实践中作了关于交流电路的三个基本实验。这些实验既可以作为课堂演示,也可以让学生自己动手实验。现在把我们所用仪器和实验方法及结果加以整理,供同志们在教学工作中参考。实验所需要的仪器列     

基于色酮骨架的新型Pd(II)配合物的合成及其晶体结构

以3-碘代色酮、降冰片烯、新戊酸钯和三(4-甲氧苯基)膦为原料,通过“一锅法”合成了一种含色酮骨架的新型Pd(II)配合物,其结构经¹H NMR, ¹³C NMR, ³¹P NMR和HR-MS（ESI-TOF）表征。X-射线单晶衍射分析显示该配合物晶体属于三斜晶系,P₁空间群,Pd与周围的4个原子形成了扭曲的平面四边形结构。     

岩石强度与应力途径

岩石的强度是岩石力学研究的一个基本问题。Jaeger在1967年曾指出:岩石破裂依赖于应力途径的可能性是一个尚需讨论的问题。Swanson和Brown研究了花岗岩、闪绿岩和大理岩在通常三轴加载和比例加载条件下的强度,没有发现岩石强度和加载方式的依赖关系。Crouch于1972年也得到了类似的结果。然而,Jaeger的问题并没有完全解决,因为仅仅对比了两种应力途径的十分有限的资料。对更广泛的岩石进行多种应力途径的实验是十分必要的。     

The Perturbation Parameter in the Problem of Large Deflection of Clamped Circular Plates

In the problems of large deflection of clamped circular plates under uniformly distributed loads,various perturbation parameters relating to load,deflection,slope of deflection,membrane force,etc.are studied.For a general perturbation parameter,the variational principle is used for the solution of such a problem.The applicable range of these perturbation parameters are studied in detail.In the case of uniformly loaded plate,perturbation parameter relating to central deflection seems to be the best among all others.The method of determination of perturbation solution by means of variational principle can be used to treat a variety of problems,including the large deflection problems under combine loads.     

The perturbation parameter in the problem of large deflection of clamped circular plates

In the problems of large deflection of clamped circular plates under uniformly distributed loads, various perturbation parameters relating to load, deflection, slope of deflection, membrane force, etc, are studied. For a general perturbation parameter, the variational principle is used for the solution of such a problem. The applicable range of these perturbation parameters are studied in detail. In the case of uniformly loaded plate, perturbation parameter relating to central deflection seems to be the best among all others. The method of determination of perturbation solution by means of variational principle can be used to treat a variety of problems, including the large deflection problems under combine loads. This paper is completed under the guidance of Prof. Chien Wei-zang.     

APPLICATION OF SHOOTING METHODS FOR TWO-POINT BOUNDARY VALUE PROBLEMS OF ORDINARY DIFFERENTIAL EQUATIONS WITH PARAMETERS IN HYDRODYNAMICS

In this paper,first we introduce the shooting method (including the method ofadjoints and the method of quasilinearization) for two-point boundary value problems ofordinary differential equations with parameters.and give out an example of solvinghydrodynamic lubrication equation by using the shooting method.The calculated resultsare satisfactory.     

弹丸入水空穴的试验研究

本文主要阐述三种不同形状不同速度的弹头,在相同条件下,以每秒几百米速度平行射入水中以后,伴随出现的各种值得研究的空穴生存的现象。     

基于MMPP的802.11网络性能

提出并建立了一个基于马尔可夫调制的泊松过程MMPP(M arkovModu lated Poisson Process)和间歇泊松过程IPP(Interrupted Poisson Process)的系统模型,从新用户的到达和系统中用户发起的新业务两个方面着手,考察了在受系统门限值约束情况下的接入系统的新用户数量和系统内用户发     

Pd及其含量对Au/CeO_2催化剂甲醇部分氧化制氢性能的影响

采用聚乙烯吡咯烷酮(PVP)保护乙醇还原法制备了不同Pd含量的Au-Pd/CeO2催化剂,考察了Pd及其含量对Au/CeO2催化剂甲醇部分氧化制氢反应性能的影响,并运用XRD、TPR、CH3OH-TPD和H2-TPD等技术对催化剂进行了表征。结果表明,Pd的加入提高了Au/CeO2催化剂的活性和氢气选择性,当Au/Pd     

束缚定态径向Schrödinger方程的节点解法

本文介绍了束缚定态径向Schrödinger方程的节点解法^[1,2]。详细分析了其理论的依据,给出了实施步骤和注意事项。文末还附了二个计算实例。和其它方法相比,本解法占用内存少,运算速度快而且计算精度高。可在内存256K,字长16位的PC机上实现。