加强消防执法规范化建设之我见

分析并阐述了《消防法》修订后赋予公安机关消防机构的新的行政执法职能与对消防执法的新要求,提出了推进消防执法规范化建设的对策。     

IETM在新型火炮装备中的应用

针对现代武器装备发展趋势及维修保障要求,以Borland Delphi为平台,采用关系数据库技术,开发了新型火炮装备的IETM系统。该系统将各种格式图像信息统一整合,采用Cult3D技术实现三维模型的人机交互,提供了方便快捷的检索方式。     

压电材料中的共线非等长多裂纹问题

建立了横观各向同性压电材料中的共线非等长多裂纹模型。将裂纹模拟为连续分布的广义位错,推导了单点广义位错的格林函数,并基于此得到了共线非等长多裂纹的奇异积分方程组,最后由数值计算给出了裂纹尖端的能量释放率。对奇异积分方程组的退化分析和对称条件下的数值结果的讨论,验证了本文结果的正确性。研究表明:当共线裂纹间距小于裂纹长度时,裂纹尖端场存在显著的干涉效应;裂纹越长,干涉效应越显著;电载荷系数越大,能量释放率也越大;相对于外侧尖端而言,共线裂纹内侧尖端对电载荷系数更为敏感。     

基于定点剪出法抗滑桩滑坡推力分布形式的确定

针对现有滑坡推力分布假设为三角形、矩形或梯形等不合理现状,提出基于定点剪出假设确定滑坡推力分布的方法。在不平衡推力法的基础上,分析桩身若干点以上潜在滑体稳定性对滑坡推力的影响,然后在相邻段滑坡推力分布为线性的条件下,计算全桩若干点处滑坡推力的分布值。结果表明,定点剪出潜在滑体的稳定性对滑坡推力分布影响较大,若该稳定系数大于工程安全要求时,则无滑坡推力产生,若该稳定系数小于工程安全要求且相邻段稳定系数相差较大时,滑坡推力分布将会产生突变。最后通过一个边坡支护桩滑坡推力分布的工程实例,对该理论分析的合理性进行了说明。且在抗滑桩结构设计中,可根据桩身若干点滑坡推力分布值,采用变截面配筋,以节省工程投资。     

螺旋轮式管道检测机器人越障性能研究

建立了一种螺旋轮式管道检测机器人驱动系统的三维模型,对驱动系统通过凸台和三通的能力进行了动力学分析。研究了预紧弹簧刚度和预紧力对螺旋轮过凸台能力的影响,讨论了过三通时的几何约束和动力学约束条件,并通过算例分析,验证了模型的正确性。     

Iran’s Nuclear Fatwa: Analysis of a Debate

For more than a decade, Iran has been referring to a fatwa issued by its Supreme Leader, Ali Khamenei, proscribing nuclear weapons. The fatwa, however, not only failed to influence the process that led to the resolution of Iran’s nuclear crisis, but also has been met with a good deal of skepticism. The most commonly held suspicions about the credibility of the fatwa can be summed up in five central questions: (1) Has the nuclear fatwa actually been issued? (2) Does the fatwa apply to all the aspects of nuclear weapons including their production, possession and use? (3) What is the juridical status of the fatwa? (4) Was the nuclear fatwa issued only to deceive other nations? (5) Is the fatwa really irreversible? This article tries to answer these questions by providing a chronological review of the fatwa and analyzing all the relevant statements by Khamenei. The analysis is conducted against the background of Islamic principles, Shi’a jurisprudence and the history of the Islamic Republic of Iran. The article concludes that the fatwa is a credible religious decree and could indeed contribute to the cause of nuclear disarmament.     

控制速度方向的弹道修正导引方法

由于制导炮弹由身管武器发射,其飞行控制能力和导引信息量有限,故基于预测落点位置偏差量来修正速度方向并在控制时间内连续分配导引指令的思想提出一种新的三维末制导方法。根据非线性弹道方程组的级数解预测弹丸落点位置,得到落点与目标的偏差,并提出两种通过此偏差解算当前速度方向修正量的方法。取剩余飞行时间为修正时间,通过将速度方向修正量分配到整个剩余导引段建立加速度修正公式,从而减小导引指令饱和的可能性。通过连续地预测落点和分配加速度指令来实时地导引飞行。仿真结果表明:该导引方法简单可行,精度高,对控制能力要求较低,且具备较好的制导效果和毁伤效果,可为该体制制导炮弹的应用提供参考依据。     

Capacity investment decisions under risk aversion

This article studies the optimal capacity investment problem for a risk‐averse decision maker. The capacity can be either purchased or salvaged, whereas both involve a fixed cost and a proportional cost/revenue. We incorporate risk preference and use a consumption model to capture the decision maker's risk sensitivity in a multiperiod capacity investment model. We show that, in each period, capacity and consumption decisions can be separately determined. In addition, we characterize the structure of the optimal capacity strategy. When the parameters are stationary, we present certain conditions under which the optimal capacity strategy could be easily characterized by a static two‐sided (s, S) policy, whereby, the capacity is determined only at the beginning of period one, and held constant during the entire planning horizon. It is purchased up to B when the initial capacity is below b, salvaged down to Σ when it is above σ, and remains constant otherwise. Numerical tests are presented to investigate the impact of demand volatility on the optimal capacity strategy. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 218–235, 2016     

Reforming China’s defense industry

ABSTRACT

Even with sizable economic inputs, access to foreign technologies, and considerable political will, China, up until the late 1990s, experienced only limited success when it came to the local design, development, and manufacture of advanced conventional weapons. Not surprisingly, therefore, reforming the local defense industry in order to upgrade its technology base and manufacturing capabilities and to make armaments production more efficient and cost-effective has long preoccupied the Chinese leadership. The fact that most of these efforts had little positive impact on the country’s military technological and industrial capabilities only encouraged Beijing to experiment with additional reforms in the hopes of finally getting it right.     

民法学本科教学改革探索

随着法学教育的深入和社会经济的不断发展,传统的民法学教学模式已不能满足社会对法学毕业生能力的要求。本文列举了当前民法教学中存在的问题,并对问题出现的原因进行分析,在此基础上提出本科教学改革的建议。如应当针对本科生编写统一的、以通说理论为内容的民法系列教材,开设有关社会、经济的其他课程以辅助学生理解民法现象和民法制度,加强实务教学,提高学生的法律思维能力和解决争议问题的能力,探索建立与实务部门的协同育人模式等。