Abel π-正则环的扩张

本文研究了Abelπ-正则环的扩张.利用环的结构理论,证明了一个Abel环R(不必有1)是π-正则的当且仅当有理想I使得I和R/I都是π-正则的.推广了一些文献的结论.     

城市交通拥挤问题的探讨

本文探讨了城市交通拥挤问题的解决方法．根据道路的拥挤状况引入畅通度的概念，量化了道路的拥挤程度．在道路的物理距离的基础上加入畅通因素把它转化为一种新的距离，这样使原有寻找最短路径的算法能继续适用．同时本文详细介绍了公路网络中信息的存储方法：Coordinate Storage（COO），Compressed Sparse Row（CSR），Compressed Sparse Column（CSC），Block Sparse Row，以及最短路径的搜索算法：Dijkstra算法和Bellman—ford算法，同时给出了Dijkstra算法步骤和它的最新改进算法．     

用静电探针反馈控制KT—5C托卡马克边缘湍流

在ＫＴ－５Ｃ托卡马克上，利用两组边缘静电探针分析作为控制探针和探测探针进行了反馈控制边缘湍流的实验，在适当的回路增益下的，当系统相移为９０°时，反馈使湍动幅度明显地抑制，电子密度和电子温度扰劝均降低了约２５％，横向粒子输运通量也相应地降低了２５％，而相移为０°，１８０°和－９０°的反馈却使湍动幅度增强，这显示反馈是基于一种非线性机制而作用于湍动的，在一定意义上，这正体现了湍流本身的非线性特征。     

基于半范数的风险测度

由于一致性风险测度公理中的平移不变性公理存在不合理性,故可将该该公理从一致性风险测度公理中去掉.将半范数的概念加以扩展,增加单调性要求,则去掉平移不变性公理之后一致性风险测度公理与半范数的要求就完全相同,这样风险度量从本质上讲就是定义在某空间上的半范数.本文发现F ishburn的风险测度是满足正齐次性、次可加性、单调性要求的.从这个意义讲,F ishburn的风险测度是一个比较科学的风险度量方法.     

Effect of Nonlinearity on Scattering Dynamics of Solitary Waves

We discuss the effect of nonlinearity on the scattering dynamics of solitary waves. The pure nth power model with the interaction potential V （Х） = Х^n/n is present, which is a paradigm model in the study of solitary waves. The dependence of the scattering property on nonlinearity is closely related to the topological structures of the solitary waves. Moreover, for one of the four collision types, the rates of energy loss increase with the strength of nonlinearity and would reach 1 at n ≥ 10, which means that the two solitary waves would become of fragments completely after the collision.     

Conductivity effect in electrorheological fluids

Based on conduction model and cubic particle model, the relationship between current density and shear yield stress of electrorheological (ER) fluids was calculated and compared with some reported experimental results. The conductivity of the insulating oils is found to have been changed by the mixed particles. Several ways to decrease insulating liquid conductivity and increase the conductivity ratio of ER fluids have been proposed to prepare ER fluids with high shear yield stresses but low current densities.     

矩阵具有正实部特征值的判定

利用根与系数的关系.证明了特征方程没有零实部根的充要条件,给出了矩阵特征值至少具有一个正实部的充分条件,最后通过示例计算验证了该方法的有效性.     

A novel knotted cotton-thread carrier:Its potential use in achieving the biomass renewal of Phanerochaete chrysosporium in an immobilized growth system

In order to achieve an innovative strategy to renew the biomass of Phanerochaete chrysosporium in an immobilized growth system which can maintain white-rot fungi biomass, a novel knotted cotton-thread carrier was designed and made. By using a high-speed stirring apparatus under the conditions of 1400 r/min stirring speed for 6 min, mycelia immobilized on the knotted cotton-thread carriers were exfoliated completely and homogenized to a proper size. Furthermore, the homogenized mycelia from the immobilized m...     

100 TW激光与等离子体相互作用中质子背向发射的能谱测量

 用100 TW激光器产生的超短超强激光与5 μm薄膜Cu靶的进行打靶实验，测量了靶背法线方向产生质子的角分布和能谱。实验中采用辐射变色膜片HD810测量质子的角分布，用CR39和Thomson磁谱仪结合测量质子能量分布。测量结果表明：质子发射张角为10°左右，质子沿着靶背法线方向发射，在能量为570 keV处出现截断。通过测量质子能量分布验证了超短超强激光等离子体相互作用过程中靶背法线鞘层质子加速机制。     

超结构换热器网络综合优化的遗传/模拟退火算法-Ⅰ.改进的换热器网络通用解方法

在换热器网络的最优化设计中,为计算其年度总费用,必须首先得到网络中各换热器流体的进出口温度.本文提出了分级超结构换热器网络中流体温度的显式解析解.这一新算法大大降低了它对计算机内存的要求,使其能适用于大规模换热器网络的温度计算和最优综合.