对加强综合性大学中师范学院建设的一点思考

在20世纪末我国兴起的新一轮高等院系调整中,众多原本独立的师范院校或教育学院并入新组建的综合性大学中。新时期我国中小学教师的培养,在很大程度上是由综合性大学中的师范学院承担的。如何认识这类师范学院的发展,加强这类师范学院的建设,这是综合性大学实现自身发展需要认真对待的问题。我国基础教育的新发展对全面提高教师质量提出了新的要求,这也对综合性大学加强师范学院建设提出了新要求。     

横向运动板干扰聚能射流的数值模拟

基于有限元分析软件ANSYS/LS-DYNA和LS-PREPOST,用ALE算法对射流垂直侵彻横向运动防护板的过程进行模拟分析。防护板在不同速度下干扰射流时,对防护板和后效板上的开坑形状进行分析,并计算后效板上的最终侵深及射流轴线上的速度降,得到射流在横向防护板作用下后效板侵深及射流轴线上的速度降随防护板速度变化的曲线。结果表明,防护板抗射流侵彻能力随防护板速度的增加而增强,尤其是防护板横向速度在0～100m/s增加时,抗射流侵彻能力增强较为明显。     

海上大气波导环境下舰载超视距雷达盲区研究

主要研究海上大气波导环境对舰载超视距雷达盲区的影响.首先对海洋蒸发波导和表面波导条件下雷达盲区的形成机理及其特性进行分析.在此基础上,对蒸发波导条件下雷达盲区在不同层结的变化进行深入研究,形成大气波导对舰载超视距雷达盲区影响的初步研究成果.最后对大气波导环境下超视距雷达盲区在军事上的应用进行展望,为后续雷达盲区特性的继...     

匈牙利法的末段两层火力反TBM目标分配优化

介绍了匈牙利法解决Assignment Problem的基本原理,对匈牙利法解决指派问题的解题步骤和特殊情况进行了说明。在给出末段两层火力防御TBM的目标分配原则的基础上,阐述了相关概念,改进了匈牙利法运用方式,并建立了目标分配模型。最后通过实例的解算,证明了该方法应用于末段两层火力防御TBM目标分配中的可行性,为末段协同反TBM的目标分配提供了一种有效的算法。     

分布式到达时间控制器装备维修任务实时调度方法

战时装备维修企业的生产环境呈现出更多的不确定性,合理安排维修任务来适应这种不确定性使实际修复时间与计划时间偏差最小是什么重要的.为此,提出了一种面向准时制造的实时生产调度方法,这种生产调度系统有多个独立的智能体,每个智能体通过到达时间控制器和仿真系统的反馈来调整对应维修任务的到达时间,然后通过先来先服务的调度规则确认维...     

Using stochastic programming to solve an outpatient appointment scheduling problem with random service and arrival times

We study a stochastic outpatient appointment scheduling problem (SOASP) in which we need to design a schedule and an adaptive rescheduling (i.e., resequencing or declining) policy for a set of patients. Each patient has a known type and associated probability distributions of random service duration and random arrival time. Finding a provably optimal solution to this problem requires solving a multistage stochastic mixed‐integer program (MSMIP) with a schedule optimization problem solved at each stage, determining the optimal rescheduling policy over the various random service durations and arrival times. In recognition that this MSMIP is intractable, we first consider a two‐stage model (TSM) that relaxes the nonanticipativity constraints of MSMIP and so yields a lower bound. Second, we derive a set of valid inequalities to strengthen and improve the solvability of the TSM formulation. Third, we obtain an upper bound for the MSMIP by solving the TSM under the feasible (and easily implementable) appointment order (AO) policy, which requires that patients are served in the order of their scheduled appointments, independent of their actual arrival times. Fourth, we propose a Monte Carlo approach to evaluate the relative gap between the MSMIP upper and lower bounds. Finally, in a series of numerical experiments, we show that these two bounds are very close in a wide range of SOASP instances, demonstrating the near‐optimality of the AO policy. We also identify parameter settings that result in a large gap in between these two bounds. Accordingly, we propose an alternative policy based on neighbor‐swapping. We demonstrate that this alternative policy leads to a much tighter upper bound and significantly shrinks the gap.     

Size dependent free vibration analysis of functionally graded piezoelectric micro/nano shell based on modified couple stress theory with considering thickness stretching effect

Higher-order shear and normal deformation theory is used in this paper to account thickness stretching effect for free vibration analysis of the cylindrical micro/nano shell subjected to an applied voltage and uniform temperature rising. Size dependency is included in governing equations based on the modified couple stress theory. Hamilton's principle is used to derive governing equations of the cylindrical micro/nano shell. Solution procedure is developed using Navier technique for simply-supported boundary conditions. The numerical results are presented to investigate the effect of significant parameters such as some dimensionless geometric parameters, material properties, applied voltages and temperature rising on the free vibration responses.     

基于摩擦磨损的数学模型的分布及讨论

主要讨论基于摩擦磨损的数学模型的分布性态和分布近似问题。引用无穷小概念,结合0-1律讨论了该模型的分布收敛于退化正态分布的条件。并在一定的矩条件下,利用特征函数,得到了该模型的分布近似于标准正态分布的误差。     

建筑火灾烟气蔓延规律对火灾探测系统的影响

分析了烟在建筑物内部的蔓延规律,讨论了烟气的蔓延规律、气流速度、障碍物及房间高度对火灾探测系统的影响,得出研究火灾烟气蔓延规律对火灾探测系统的可靠性具有重要意义的结论。     

涉外型院校实施体育“双语教学”的可行性研究

在社会飞速发展的时代,经济的进步促使知识的日新月异,导致教学模式的不断创新。伴随着我国加入WTO,双语教学应运而生.在体育教学中运用双语教学,是体育教学模式的大胆尝试和教学手段的创新.涉外型院校具有实施体育双语教学得天独厚的条件,双语教学的实施具有重要意义,并有可行性。