著名物理学家的简单性思想探讨

本文从方法论的角度，结合物理学的进化历程，考察了一些著名物理学家的简单性方法的运用，简单性原的形成，及其简单性思想的发展，着重对爱恩斯坦的逻辑简单性原则和马赫的思维经济原则进行了深入探讨，揭示了简单性思想对物理学乃至整个自然科学发展的重要意义。     

石英波片用于高斯光束中的特性分析

考虑到高斯光束本身的强度分布特性和高斯光束经过薄片的多次相干效应,本文给出了高斯光束经过石英波片后两光束的透射比,并就这一效应对波片性能的影响进行了研究.     

随机Dirac算子的旋转数和谱

本文研究概率空间(Ω,F,μ)上的一维平稳遍历Dirac算子H_ω,定义了算子H_ω在实数λ处的旋转数a(A),并证明了a(A)的单调上升点恰是H_ω的谱点.     

关于代数微分方程的允许解

本文讨论了几类代数微分方程允许解的存在性,推广了Laine等人的结果.     

一类树问题的快速并行算法

本文给出了一类树问题的快速并行算法.这些问题包括:求树中任意两顶点之间的路径和路径长度、求所有顶点的深度等.以这些基本算法为基础,给出了求树中任意两个顶点的最小公共祖先问题、边修改动态最小生成树问题和树同构问题的并行算法.本文使用的模型是单指令流多数据流共享存贮器并行计算机,允许多个处理机同时读存贮器的一个单元的内容但不允许同时写,称这种模型为CREW PRAM.对n个顶点的树,以上算法均使用O(n)个处理机,时间复杂度为O(logn).按Cook的定义,证明了以上问题都属于NC类.     

利用三甲硅基烯醇醚制备α-溴代醛酮

利用三甲硅基烯醇醚,在不同溶剂中制备了4种a-溴代醛酮,其产率在80%～95%之间.     

含氰基季铵盐杀菌剂DMM_(12)的性能研究

研究了含氰基季铵盐杀菌剂DMM_(12)的性能.实验结果表明,DMM_(l2)具有良好的杀菌和缓蚀作用,水溶性好,加入水中后能使滤膜系数有所提高,和阻垢剂水解聚马来酸酐及缓蚀剂六偏磷酸钠共存时具有良好的配伍性,和戊二醛复配使用时具有协同作用.     

Study on the photosynthetic performances of Enteromorpha prolifera collected from the surface and bottom of the sea of Qingdao sea area

In this work, the photosynthetic performances of Enteromorpha prolifera thalli collected from the sur- face and bottom of the sea of Qingdao sea area were studied with chlorophyll fluorescence and oxy- graph technology. The samples with the highest photosynthetic activity among their kinds, the floating thalli from the sea surface of the south of the Qingdao Olympic Sailing Center and the sedimentary thalli from the mud surface of the bottom Tuandao bay, were chosen as representatives of surface thalli and ...     

Effect of the silicon powder content on the properties of Al_2O_3-SiC-Me composites

By means of transient plastic phase process,the Al2O3-SiC-Me composites were produced throungh adding metal aluminium and silicon-powder to Al2O3-SiC materials.Under the condition of the same content of silicon and aluminium mixed-powder,the effect of silicon powder addition on properties of Al2O3-SiC-Me composites was studied by means of XRD and EPMA analyses in the temperature range of 300°C-1600°C.The results indicated that the content of metal phase in the sample at 1600°C increases with increasing silicon powder content.At the same time,when the temperature is lower than 1100°C,the strength of samples gradually increases with increasing temperature.However when the temperature is higher than 11000°C,the strength of samples gradually decreases with increasing temperature,and this change is very small.The results also indicated that at the same sintering temperature,the sample with 6%silicon powder has the maximum strength.     

指控系统的结构对防空战性能的影响

指挥控制系统是决定现代高技术战争胜负的关键因素，其重要性越来越受到国防和军事部门的重视，而系统的决策模型又是整个系统性能好坏的基础。建立了某防空指挥控制系统的变结构Petri网决策模型，并通过性能评估验证了变结构模型在提高系统抗毁性和灵活性等性能指标方面的作用。