辅助镀膜离子源及立方氮化硼薄膜的制备研究

为选出合适的辅助离子源进行沉积制备c-BN薄膜,通过对高能和低能辅助镀膜离子源的重要性能进行比较研究之后,在单晶Si基体进行应用制备立方氮化硼薄膜,用红外光谱(FTIR)及光电子能谱(XPS)分析技术,对不同辅助离子源制备沉积的薄膜,进行比较表征,得出结论:低能辅助镀膜离子源,比高能辅助镀膜离子源更适用于制备立方氮化硼薄膜。     

Balancing a one‐way corridor capacity and safety‐oriented reliability: A stochastic optimization approach for metro train timetabling

In urban rail transit systems of large cities, the headway and following distance of successive trains have been compressed as much as possible to enhance the corridor capacity to satisfy extremely high passenger demand during peak hours. To prevent train collisions and ensure the safety of trains, a safe following distance of trains must be maintained. However, this requirement is subject to a series of complex factors, such as the uncertain train braking performance, train communication delay, and driver reaction time. In this paper, we propose a unified mathematical framework to analyze the safety‐oriented reliability of metro train timetables with different corridor capacities, that is, the train traffic density, and determine the most reliable train timetable for metro lines in an uncertain environment. By employing a space‐time network representation in the formulations, the reliability‐based train timetabling problem is formulated as a nonlinear stochastic programming model, in which we use 0‐1 variables to denote the time‐dependent velocity and position of all involved trains. Several reformulation techniques are developed to obtain an equivalent mixed integer programming model with quadratic constraints (MIQCP) that can be solved to optimality by some commercial solvers. To improve the computational efficiency of the MIQCP model, we develop a dual decomposition solution framework that decomposes the primal problem into several sets of subproblems by dualizing the coupling constraints across different samples. An exact dynamic programming combined with search space reduction strategies is also developed to solve the exact optimal solutions of these subproblems. Two sets of numerical experiments, which involve a relatively small‐scale case and a real‐world instance based on the operation data of the Beijing subway Changping Line are implemented to verify the effectiveness of the proposed approaches.     

多功能土工三轴仪的研制及其应用

采用多种先进技术,研制成功一台多功能土工三轴仪.该仪器采用模块组合结构,结构轻巧,移动方便,可根据需要放在合适的位置;可与CT机和恒温箱配套,研究土的结构演化规律及温度对土的力学特性的影响;功能多,可用于特殊土、非饱和土及饱和土的30多种试验.应用多功能土工三轴仪取得了许多重要科研成果,表明该仪器是研究土的力学特性的有力工具.     

子母弹抛撒半径对机场毁伤效果影响分析

首先阐述了机场目标在未来战争中的地位与作用 ,在对机场目标及其子目标分析的基础上 ,建立了炮道失效率的计算模型。利用蒙卡模拟的方法重点研究了子母弹抛撒半径对机场毁伤效果的影响 ,并摸索了一些规律     

论师范院校语文教育理论课教学改革和实验

语文教育理论课普遍存在教学结构不合理 ,理论体系和技能训练体系不完整 ,缺乏系统性和科学性 ,理论传授与能力训练相脱节等问题 ,影响了教学质量的提高 ,制约了教学改革的展开。本文对该课程的教学结构进行重新审视、梳理 ,将之划分为两个系统 ,并将其各自要素及相互关系进行分析 ,论证了理论知识系统与教学技能训练系统在教学过程中相互对应 ,同步进行 ,共同深化的科学性和可行性。     

压水堆大破口失水事故安全装置实验研究

本文针对压水堆发生主管道“双端断裂”的大破口失水事故而提出了一种安全装置,对其工作原理及工程上实现的可能作了浅析,对其原理性实验过程及结果作了介绍。实验表明:这种安全装置结构简单,原理正确,工程上易实现,造价低廉。它在大破口失水事故发生初期(约数十毫秒)就能充分发挥其作用。对于防止堆芯熔化具有重要意义。     

党对军队的绝对领导是长征胜利的根本保证

党对军队的绝对领导是我军建军的根本原则,是我军政治工作的优势。长征途中,在党的绝对领导下,红军解除了错误军事路线的统治,粉碎了张国焘分裂党、分裂红军的图谋,制定了正确的战略决策和行动方针,取得了长征的完全胜利。     

加强旅团对基层的"面对面"领导

坚持旅团对基层的"面对面"领导,要强化职责意识,增强"面对面"领导的主动性、自觉性;理清工作思路,突出工作重点,增强"面对面"领导的系统性、科学性;切实转变观念,树立务实作风,增强"面对面"领导的针对性、实效性.     

坚持和平发展，树立新型国防观——试论新世纪新阶段我国新国防观之科学构建

在全面建设小康社会的进程中,面对复杂变化的国家安全形势,维护重要战略机遇期,确保我国安全稳定发展,必须在科学发展观的指导下,坚持以和平发展为前提,以维护国家安全利益为基点,以富国强兵为路径,科学构建新世纪新阶段我国的新型国防观。     

抗震救灾斗争对执行多样化军事任务的启示

执行多样化军事任务事关国家安全和发展利益,紧系人民生命财产安全,要求我们必须有高度的政治责任意识;执行多样化军事任务参与力量多、协作任务重、工作范围广,要求我们必须建立健全联合高效的统一指挥机制;执行多样化军事任务往往事发突然,通讯交通受阻、信息采集难度大、新闻宣传制约因素多,要求我们必须注意信息掌握与管控;执行多样化军事任务艰巨繁重,任务转换节奏快,专业素质要求高,要求我们平时必须加强非战争军事行动的针对性训练;执行多样化军事任务条件艰苦、环境恶劣,不仅要连续作战,而且随时面临生命危险,要求我们必须大力培育部队的战斗精神;执行多样化军事任务对后勤补给、装备保障有着特殊要求,我们必须不断加强执行多样化军事任务的各项保障建设。