反偏二极管的计算机辅助设计

利用有限元法解泊松方程，可以得到反偏二极管中的二维电位分布和最大电场强度．模拟结果指出：正斜角二极管中的电场强度小于负斜角二极管中的电场强度，前者的最大电场强度处于反偏二极管的中心，而后者的最大电场强度则处于表面．因此，正斜角二极管可以达到高的反向击穿电压．     

蠕变分析的有限元方法

介绍了蠕变分析的基本原理及有限元公式，并将蠕变分析加入参考文献［１］所述的有限元程序，扩充为热弹塑性蠕变分析的有限元程序．文中给出了典型算例．     

油气层中常见微粒的运移程度及其与ζ电位关系的研究

微粒运移是造成油气层损害最严重和最普遍的因素之一。要防止油气层中的微粒运移，就必须先弄清楚油气层中常见微粒的运移情况和影响微粒运移的主要因素。因此，通过对国内外大量微粒分析资料的统计分析，选定了油气层中常见的地层微粒作为研究对象，用新建立的、较完善的实验方法研究了这些微粒的运移程度，对这些微粒的ζ电位进行测定，发现其运移程度与其ζ电位的大小有关。一般地说，微粒ζ电位值越大，其运移程度也越大。     

双极模式静电感应晶体管设计要点

在新的阻断状态解析模型基础上,定量讨论了双极模式静电感应晶体管(BSIT)主要结构参数(外延层杂质浓度N_B、漏源间距w、栅区深度r及栅间距2a)与沟道势垒的关系,同时给出了定性解释。还分析了大注入通态特性与结构参数的关系,为BSIT的关态及通态设计提供了理论依据。     

Discontinuity, decision and conflict

Summary The motivation for this paper arises out of the authors experiences in modelling real decision makers where the decisions show not only a continuous response to a continuously changing environment but also sudden or discontinuous changes. The theoretical basis involves a parametric characterisation of the environment, a decision makers perception of it in terms of a twice differentiable Distribution Function and a bounded Loss Function. Under a specified, minimizing dynamic, the resultant Expected Loss Function satisfies the conditions for a potential function and Thoms Catastrophe Classification Theorem may be used to assess the singularity points and the thresholds at which jump decisions are taken. The paper describes the theory, summarises some results on unimodal distributions illustrated by jump decisions and population polarisation. Mixture distributions are then examined and the E^* models defined. These are then briefly illustrated by reference to models which have been constructed in relation to Prison Riots, Agricultural and Economic modelling.     

中国“十五”节能计划及对策

文章简要介绍中国十五节能计划,提出21世纪中国经济的持续发展应该建立在大力提高能源利用效率和效益,并积极开发利用可再生能源的基础之上。     

Modelling and effective modification of smooth boundary geometry in boundary problems using B-spline curves

To create curves in computer graphics, we use, among others, B-splines since they make it possible to effectively produce curves in a continuous way using a small number of de Boor’s control points. The properties of these curves have also been used to define and create boundary geometry in boundary problems solving using parametric integral equations system (PIES). PIES was applied for resolution 2D boundary-value problems described by Laplace’s equation. In this PIES, boundary geometry is theoretically defined in its mathematical formalism, hence the numerical solution of the PIES requires no boundary discretization (such as in BEM) and is simply reduced to the approximation of boundary functions. To solve this PIES a pseudospectral method has been proposed and the results obtained were compared with both exact and numerical solutions.     

离散势场在迷宫机器人路径规划上的应用

针对迷宫这一特殊的复杂环境,在分析传统人工势场法的不足的基础上,本文提出离散势场概念,来解决其路径规划问题。在初始化的离散势场基础上,根据传感器信息调整势场值,该算法可以使迷宫机器人的行走路径达到最优化。最后进行了计算机仿真,结果表明,该算法在迷宫这样的复杂环境下能有效地实现路径规划。     

Attempts to Synthesize Zeolitic Composites from Stellerite

A feasible method to synthesize NaA and NaY zeolite from stellerite, the very cheap raw material found in China, was reported in this article to reduce the cost of zeolite synthesis for the first time. After stellerite is calcined above 973 K with sodium carbonate, this natural zeolite can be slowly dissolved in alkali solution and partly forms the gels, then transforms to zeolite NaA or NaY by structural rearrangement. The effect of synthetic conditions such as the ratio of different cation used in the reactive mixture on the resulting zeolite is examined. Furthermore, a new NaA/MCM-41 composite possessing both micropore and mesopore is synthesized by adding the NaA zeolite into the synthetic system, and the impact of zeolite additive on the pore structure of final porous composite is also explored.