Failure Modes for Single-Layer Reticulated Domes Under Impact Loads

The paper presents the theory of Hamilton variation principle which is the current method for impact problem, central difference method which is efficient solution of finite element (FE) method for impact problem and adapts to solve non-linear dynamic problem. And it introduces the ANSYS/LS-DYNA which is the popular FE software for impact problem both at home and abroad. Then it gives solutions for one simple model by analytical method and ANSYS/LS-DYNA respec-tively to validate function of software, and they are consistent. Afterward, it gives model of single-layer Kiewitt reticulated dome with a span of 60 m, and the cylinder impactor, and introduces the contact interface arithmetic, especially the material model of steel (piecewise linear plasticity model) which takes stain rate into account and makes steel failure stress higher under impact loads. The vertical displacement, stress in main members, and the plastic deformation for dome under impact loads were obtained. Then four failure modes (no failure, moderate failure, global failure and slight failure) were summarized according to the rules of dynamic response. And the characteristics of dynamic response for each failure mode were shown.     

介绍一种统计熵的微机计算法

在物理化学教学中,用统计热力学方法计算熵,由于计算量大,过程复杂,无法演示其完整的计算过程。最近国家教委推广的《计算机辅助化学教学软件》也未涉及统计热力学内容。本文用 BASIC 语言编制了一种用统计热力学方法计算熵的微机程序,并分别在 APPLE-Ⅱ和 IBM-PC 机上通过。对求算转动熵需要的转动惯量,采用了求哈密顿矩阵本征值的计算方法。     

一类非线性schrodinger可积方程族及其可积耦合

本文基于loop代数的一个子代数,利用屠格式导出NLS可积方程族,另外,利用迹恒等式建立其Hamilton结构,再进一步求出可积耦合系统。     

The permanent secretary as policy-maker,shaper, taker,sharer, and resister in education – reflections on Sir James Hamilton as a centralising outsider

Given that elevation to permanent secretary is widely recognised as the apotheosis of a career in the Whitehall bureaucracy, it is remarkable that so few have been the subject of sustained biographical research and that this key role remains largely un-theorised. As such, this paper reports on aspects of a longitudinal study which set out to examine, evaluate, and categorise to what extent, and how, permanent secretaries influence policy. Based on recorded interviews with those who held this office at the DES from 1976 to 2002, along with those they served and others, it argues that if the role of senior civil servants can be labelled ‘meta-political’, they do influence policy in significant ways. As such, it suggests that their praxis can be interrogated in terms of their activities as makers, shapers, takers, sharers, and resisters of policy in education. Focusing on the career of a committed centraliser, James Hamilton, it examines the contribution he made as permanent secretary to a variety of departmental policy initiatives including the pursuit of voucherisation and the case for a national school curriculum.     

最佳旅行问题的一种求解方法

本文建立最佳旅行线路的图论模型,在此模型中将求解走遍全中国的最佳旅行线路转化为最佳哈密尔顿回路的问题,通过Floyd算法和二边逐次修正法找到最佳H圈的近似解,即为最短路旅行线路。     

四维协变的哈密顿原理及其推论

文章指出了虚功表达式中的不当之处,讨论了哈密顿原理的四维协变形式,并得出了一系列有用的推论.     

无限大棋盘上马的遍历问题

我们定义无限大棋盘上马的Hamilton路径为棋盘格子的一个无限序列,在这个序列中前后相邻的格子之间可以经马步到达,而且棋盘上的每个格子在序列中出现且只出现一次。我们证明了在无限大的棋盘上存在马的一个Hamilton路径。     

Neighbourhood Conditions and Hamiltonian Properties

本文利用图的独立数和任意３个独立点集中距离２的点对邻域交,给出了图为Ｈａｍｉｌｔｏｎ和Ｈａｍｉｌｔｏｎ连通的新的充分条件     

L图的确定

通过对L图存在性的探讨研究 ,得出结论 :当顶点数ν与边数ε分别满足公式。ν=2 ∑mn=1 n　　ε=ν m - 1　 ( 2≤m≤ 3)时 ,可以确定出人图     

甲基丙烯醛脱羰反应机理研究

介绍了IRC和反应途径的哈密顿理论研究反应机理的方法 ,讨论了甲基丙烯醛脱羰反应的机理