H 面双填充介质金属方波导的本征模

通过求解Ｈ面双填充介质金属方波导中位函数的亥姆霍兹方程,得到系统的电磁波的本征模函数及本征值方程,其本征模为ＬＳＥ模或ＬＳＭ模,并给出了色散关系的数值解。     

舰炮瞄准角速度和角加速度的定量分析

从舰炮火控原理出发,用坐标转换技术和微分理论,推导了在二轴和三轴稳定情况下,火炮瞄准的角速度和角加速度公式,并讨论了跟踪器的有关情况,给出了计算实例和主要结论。     

激波诱导惰性堆积粉尘运动的建模及数值模拟

基于空间平均的双流体模型 ,引入描述颗粒脉动速度的粒化温度 ,建立颗粒相的本构方程 ,将粒化温度模型推广到解决高速流动问题。采用AUSM+ 有限差分法 ,数值模拟激波在一定厚度的惰性粉尘床中传播及诱导粉尘颗粒运动的过程。结果表明 ,粒化温度模型较好地描述了这一过程 ,证实了此模型在处理稠密颗粒高速流动和流场存在强间断中的可行性     

基于数据适应性检验的身管磨损量预测研究

应用灰色系统理论研究不确定系统,对系统进行灰色预测模型建立的同时,需要检验系统原始数据序列是否符合建模要求。主要从3个方面检验数据建模的可行性,分别是光滑比、极比偏差和凹凸性检验。结合某型坦克炮身管内膛烧蚀磨损数据,采用不同的磨损数据作为灰色预测模型建模的原始数据序列,具体分成两种情况进行数据检验,并代入模型计算,分析不同情况下模型的预测精度,通过对比计算结果选出与模型匹配度更高的原始数据序列。     

Single machine just‐in‐time scheduling problems with two competing agents

In scheduling problems with two competing agents, each one of the agents has his own set of jobs to be processed and his own objective function, and both share a common processor. In the single‐machine problem studied in this article, the goal is to find a joint schedule that minimizes the total deviation of the job completion times of the first agent from a common due‐date, subject to an upper bound on the maximum deviation of job completion times of the second agent. The problem is shown to be NP‐hard even for a nonrestrictive due‐date, and a pseudopolynomial dynamic program is introduced and tested numerically. For the case of a restrictive due‐date (a sufficiently small due‐date that may restrict the number of early jobs), a faster pseudopolynomial dynamic program is presented. We also study the multiagent case, which is proved to be strongly NP‐hard. A simple heuristic for this case is introduced, which is tested numerically against a lower bound, obtained by extending the dynamic programming algorithm. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 61: 1–16, 2014     

A search game on a cyclic graph

There is a finite cyclic graph. The hider chooses one of all nodes except the specified one, and he hides an (immobile) object there. At the beginning the seeker is at the specified node. After the seeker chooses an ordering of the nodes except the specified one, he examines each nodes in that order until he finds the object, traveling along edges. It costs an amount when he moves from a node to an adjacent one and also when he checks a node. While the hider wishes to maximize the sum of the traveling costs and the examination costs which are required to find the object, the seeker wishes to minimize it. The problem is modeled as a two‐person zero‐sum game. We solve the game when unit costs (traveling cost + examination cost) have geometrical relations depending on nodes. Then we give properties of optimal strategies of both players. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004.     

弹载惯性测量系统抗高过载技术

在现代高技术条件下的局部战争中,为了提高火炮的射程、打击精度和反应速度,发展制导炮弹系统就成为必然的选择.弹体姿态测量系统是制导系统的重要组成部分,解决其在炮弹发射高过载恶劣环境下的生存问题就成为研究的关键之一.提出了主要抗高过载手段,并对弹体姿态测量系统的抗高过载性能进行了Ansys软件仿真、马歇特试验以及实弹飞行试验.最后得到结论,所给出的抗高过载方案在降低高过载对弹体姿态测量系统的影响方面,可以发挥良好的作用.     

《新疆历史与民族宗教理论政策教程》教学设计创新探析

民族地区社会转型推动高校思想政治理论新课程的实施。新课程需要遵循新的教学理念：以学生为主体,教师为主导;以师生互动,关注教学过程为关键;面向生活实际,灵活运用多种教学手段和方法,创新考核方式,加大课外实践力度。创新教学模式,增强教育实效性是一项任重道远的研究课题。     

富营养化水体修复技术的研究现状

湖泊、水库的富营养化已经成为当今世界最主要的环境问题之一。针对富营养化治理的关键问题、治理现状以及目前富营养化水体的一些主要修复技术进行了简要的阐述,并指出防治水体富营养化是一项复杂的系统工程,必须坚持从控制污染源出发,重点开展生态修复,完善管理对策,有计划地逐步实施。     

A novel variable topology design for a multi-flexible ejection mechanism

The airborne missile launch mechanism often subjects to significant deformations induced by the large ejection force during high-speed actuations in missile ejection process, leading to a substantial deviation of separation parameters from designed values that threats safety of the carrier. This study proposes a novel variable topology design for launch mechanism, achieved via a Prismatic-Revolute-Revolute pair (PR-R) motion formed by the structural gap with a specific direction. It enables launch mechanism variability during missile ejection process and optimizes the ejection force given by the front and back ejection arms, and greatly optimizes the separation parameters during missile ejection. The kinetics simulation analysis is conducted under working conditions of the original ejection mechanism and the novel mechanism with variable topology design, respectively. The results show that the novel variable topology design is more befitting for the launch process in terms of system safety and controllability, effectively improving the separation posture, restraining the flexible effect of the mechanism, and fulfilling the effectiveness of the design value of multi-rigid body.