任职教育中案例教学方法探析——以《中国近现代史纲要》课程为例

案例教学法被逐步地引进任职教育的课堂,本文以《中国近现代史纲要》课程为例,探析了任职教育中案例教学法的应用。从教学目的、教学内容和教学对象三个方面分析了《中国近现代史纲要》课程运用案例教学的可行性。从《中国近现代史纲要》课程运用案例教学的意义可以看出,案例教学是作为该课程教学改革的最佳途径。运用案例教学时,在案例选取上兼顾真实性、针对性、时效性,在案例分析过程中注重教学主体和客体的双向交流,在案例总结时注重案例结论与讨论论点的区别。     

业主延期条件下FIDIC施工合同条件调价公式研究

调价公式作为FIDIC合同中最重要的风险分配方式之一,通过对可调价要素价格指数或价格的调整,把合同中的隐性风险在业主和承包商之间的分配比例作了明确规定.从承包商的角度,并基于业主的原因造成工期延长的条件下,对调价公式中各个组成因子及其权重对调价结果的影响进行了研究,探索把调价公式同成本管理有机结合起来,以期达到降低成本...     

降雨与库水位涨落作用下边坡渗流场分析

降雨与水位涨落会使渗流场产生剧烈变化,而渗流场计算是边坡稳定分析的重要依据。在分析比较各种渗流计算方法的基础上,采用饱和-非饱和渗流理论计算降雨与水位涨落作用下的边坡渗流场,分析了渗流场随时间的变化规律以及渗透系数k、水位变动速度t,对边坡渗流场的影响,得出了浸润线在水位下降过程中各时刻的具体位置,以及水力梯度的分布情况,为边坡稳定性分析提供了可靠依据。     

模糊集值统计理论在灭火救援指挥效能评估中的应用

在建立评估指标体系的基础上,将模糊集值统计理论应用于灭火救援指挥效能评估中。该理论方法改变了以往统计给出一个固定值的做法,而给出一个区间值,使某些具有模糊性和随机性的评估指标权值的确定更加符合实际情况。实例研究表明:该方法克服了经典统计法的不足,提高了效能评估的实用性和科学性。     

Capacity allocation with traditional and Internet channels

In this paper we study a capacity allocation problem for two firms, each of which has a local store and an online store. Customers may shift among the stores upon encountering a stockout. One question facing each firm is how to allocate its finite capacity (i.e., inventory) between its local and online stores. One firm's allocation affects the decision of the rival, thereby creating a strategic interaction. We consider two scenarios of a single‐product single‐period model and derive corresponding existence and stability conditions for a Nash equilibrium. We then conduct sensitivity analysis of the equilibrium solution with respect to price and cost parameters. We also prove the existence of a Nash equilibrium for a generalized model in which each firm has multiple local stores and a single online store. Finally, we extend the results to a multi‐period model in which each firm decides its total capacity and allocates this capacity between its local and online stores. A myopic solution is derived and shown to be a Nash equilibrium solution of a corresponding “sequential game.” © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

带壳体云爆弹药液体燃料抛撒的数值模拟

建立了带壳体云爆弹药数值模拟模型,分析了圆柱壳体的断裂准则。壳体材料采用Johnson-Cook热粘性本构方程,断裂准则采用Taylor断裂应力准则,应用Autodyn软件进行了数值模拟,给出了内部爆炸载荷下液体燃料的压力曲线和速度曲线,并进行了分析。     

基于检测数据的某型空地导弹质量排序方法

目前勤务上对空地导弹的质量检测只有简单的合格、不合格之分,难以对导弹性能科学排序.通过分析空地导弹质量的影响因素,采用模糊层次分析法对初步拟定的指标体系中定量指标和定性指标进行筛选,建立某型空地导弹质量评价的指标体系,然后设计3类专家的咨询法主观确定指标权重,最后通过导弹检测分项加权评价的方法对某型空地导弹质量进行科学排序.     

基于一种单向滑模的某巡飞弹过载控制仿真

以某巡飞弹为研究对象,将法向过载作为控制对象,采用普通滑模控制理论设计了控制系统,仿真计算发现舵偏角存在剧烈的抖振,严重影响了飞行稳定性.为了抑制抖振,在此基础上采用了一种单向滑模控制方法重新设计了控制器,并推导证明了该控制系统的渐进稳定性.仿真结果表明单向滑模控制系统具有振荡次数少,收敛速度快,无抖振的优点,该方法在飞行器控制领域有很好的应用前景.     

【专题】深度态势感知与智能化战争

未来战争是人机环系统融合的战争。它不仅仅是智能化战争,更是智慧化战争。未来的战争不但要打破形式化的数学计算,还要打破传统思维的逻辑计算,是一种结合人、机和环境各方优势互补的新型计算-算计博弈系统。本文以智能化战争为背景,探讨了深度态势感知的概念、内涵与模型;介绍了未来战争中深度态势感知模型发挥的作用,即深度态势感知解决了人工智能中的可解释性、学习及常识三个重要瓶颈;最后,介绍了深度态势感知在未来战争中面临的挑战,包括人机环境系统融合问题、战场中的不确定性以及智慧化协同作战的实现。鉴于人机融合智能机制、机理破解以及有效的协同方式将成为影响未来战争的关键因素,深度研究态势感知对预测未来战争走向具备一定借鉴意义。     

Formation and characterization of core-shell CL-20/TNT composite prepared by spray-drying technique

The core-shell 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/2,4,6-Trinitrotoluene (CL-20/TNT) composite was prepared by spray-drying method in which sensitive high energy explosive (CL-20) was coated with insensitive explosive (TNT). The structure and properties of different formulations of CL-20/TNT composite and CL-20/TNT mixture were characterized by scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Laser particle size analyzer, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), differential scanning calorimetry (DSC), impact sensitivity test and detonation performance. The results of SEM, TEM, XPS and XRD show that ϵ-CL-20 particles are coated by TNT. When the ratio of CL-20/TNT is 75/25, core-shell structure is well formed, and thickness of the shell is about 20–30 nm. And the analysis of heat and impact show that with the increase of TNT content, the TNT coating on the core-shell composite material can not only catalyze the thermal decomposition of core material (CL-20), but also greatly reduce the impact sensitivity. Compared with the CL-20/TNT mixture (75/25) at the same ratio, the characteristic drop height of core-shell CL-20/TNT composite (75/25) increased by 47.6% and the TNT coating can accelerate the nuclear decomposition in the CL-20/TNT composites. Therefore, the preparation of the core-shell composites can be regarded as a unique means, by which the composites are characterized by controllable decomposition rate, high energy and excellent mechanical sensitivity and could be applied to propellants and other fields.