从数学建模开始的对应用数学教学的反思

本文讨论了在数学建模中暴露出的若干应用数学中的教学问题,其中一些问题涉及到某些数学基础     

基于运行安全分析的核动力仿真软件的研究与应用

对基于运行安全分析的核动力仿真软件的基本功能及其数学物理模型进行研究.运用工具软件对设备冷却水系统的正常与异常运行工况进行了仿真计算及结果的分析.与RELAP5/MOD3计算结果的比较表明,该软件可广泛用于核动力一回路辅助系统及二回路系统的仿真分析.     

潜射弹道导弹出水姿态分析

分析了潜艇深度、纵倾角、横倾角、海面风速、海面波长、平均波高等因素对潜射导弹的偏航角、俯仰角、滚动角、偏航角速度、俯仰角速度、滚动角速度的影响。由于实验数据比较分散,不适合神经网络的训练,所以首先对实验数据模糊化,并用以对神经网络的训练。用训练好的神经网络分析了潜艇单因素变化的导弹出水姿态。     

A general model of heterogeneous system lifetimes and conditions for system burn‐in

Burn‐in is a technique to enhance reliability by eliminating weak items from a population of items having heterogeneous lifetimes. System burn‐in can improve system reliability, but the conditions for system burn‐in to be performed after component burn‐in remain a little understood mathematical challenge. To derive such conditions, we first introduce a general model of heterogeneous system lifetimes, in which the component burn‐in information and assembly problems are related to the prediction of system burn‐in. Many existing system burn‐in models become special cases and two important results are identified. First, heterogeneous system lifetimes can be understood naturally as a consequence of heterogeneous component lifetimes and heterogeneous assembly quality. Second, system burn‐in is effective if assembly quality variation in the components and connections which are arranged in series is greater than a threshold, where the threshold depends on the system structure and component failure rates. © 2003 Wiley Periodicals, Inc. Naval Research Logistics 50: 364–380, 2003.     

微小卫星编队飞行轨道动力学及相对位置保持控制方法

微小卫星编队飞行是20世纪90年代中、后期出现的航天新概念,它是通过一组群聚卫星的协同工作完成相应的空间任务,具有广阔的应用前景。对微小卫星编队飞行的轨道动力学建模进行了详细研究,并应用势函数方法推导了用于卫星编队飞行相对位置保持的连续控制律及离散控制律。     

武器装备排气系统红外抑制器技术综述

主要介绍了排气系统红外抑制器的原理,归纳了建立抑制器模型的方法,列举了多种提高红外抑制器性能的方案和一些重要实验结果。同时对抑制器发展现状进行了介绍和总结,并作出了比较和展望。     

数学建模与创新能力的培养

通过开展数学建模教学 ,将数学教学与解决实际问题有机结合起来 ,培养学生创新能力     

钢丝绳弹性联轴器特性建模

提出一个钢丝绳弹性联轴器特性的数学模型,该数学模型能很好地描述钢丝绳弹性联轴器的迟滞非线性特性.分析表明,钢丝绳弹性联轴器具有软刚度和阻尼大的特性,有利于抑制船舶轴系的振动.     

Merely ‘Docile Self-Deception’? German Experiences with Nuclear Consultation in NATO

ABSTRACT

Recent nuclear-weapons-related consultation in NATO within the framework of the Defence and Deterrence Posture Review sheds light on historical experiences with nuclear consultation in NATO. In the early years of the Nuclear Planning Group (NPG), which became the main forum for multilateral nuclear consultation in the alliance, developing a nuclear weapons first use doctrine was of particular importance. This process led to the adoption of the Provisional Political Guidelines (PPGs) on the threat to initiate the use of nuclear weapons. With a focus on West Germany as the primary addressee of the NPG, it will be postulated that nuclear consultation functioned and may still be seen as an essential tool to manage the credibility of US extended nuclear deterrence in the framework of NATO.     

The fateful phoenix: the revival of Al-Qa’ida in Iraq

Although the Islamic State in Iraq and al-Sham (ISIS) is seen as a novel manifestation of Islamic extremism, it is in fact the latest, albeit perhaps the most effective, of a long line of revivalist movements in the Islamic and the Arab worlds. Its motivations – hisba and jihad – differ little from its predecessors and its ambitions – to create a state organised in accordance with the precepts of the Islamic caliphate – reflect a long-standing Islamic ambition. It differs, of course, in terms of the sophistication of its political and military strategies, which mirror the contemporary complexities of the world in which it operates, but its objectives recall long-standing Islamic ideals, even if articulated in radically brutal and extremist ways. More importantly, perhaps, ISIS or Da’ish, to give it its Arabic sobriquet, reflects the enormous degree of resentment inside the Middle East at the ways in which Western powers have intervened in regional affairs over recent years, particularly their support for regimes and economic systems there that have betrayed, in the popular imaginary, the essential principles of social justice that lie at the root of Islamic vision of ideal social order. Indeed, in many respects, its analysis of the world in which it operates and of the objectives it seeks differ little in essence from those any other resistance and rejectionist movement, whether religious or sectarian. More specifically, it has been the sectarian conflict that resulted from the reversal of political order in Iraq as a result of the 2003 American-led invasion that has driven the success of the movement in capturing widespread Sunni support. Whether it can manage the complexities of the administration of a state remains open to question.