民族学生实习中常见问题及对策

大学本科生的综合实习不仅可以让学生把理论知识运用于实践,而且还可以使学生在实习中得到实践的锻炼。无论从做人还是做事,综合实习对学生来说都是非常重要的。实习是培养既具备系统理论知识,又具备较强动手能力高素质科技人才的关键一环。     

防空火控系统火力分配的多目标优化研究

在防空火控系统的研究中,如何充分发挥火力单元的作战效能,使来袭目标遭受最大的毁伤,是火力分配研究的一个关键问题.通过对防空火控系统的分析,给出了防空火控系统火力分配的问题描述,并建立了基于指派问题的火力分配数学模型.提出了威胁度计算的改进方法.在使防空高炮群对威胁度大的目标造成大的毁伤分配准则下,研究了利用匈牙利法求解指派问题时的具体方法.经仿真验证,此火力分配方法合理、有效.     

高炮随动系统性能测量算法

针对火炮调炮精度检测中存在的不足, 提出了一种基于双目立体视觉的三重交会测量方法,在炮身管上附加球状标志物,利用CCD摄像机获取标志物图像,通过标志物成像的几何投影关系计算球心的三维坐标.为了降低图像识别误差的影响,对投影的识别位置进行拓展和细化,并对球心投影边界进行插值,摄像机光心与插值点连线射线形成了一个锥体,两摄像机的锥体分别与炮台球面相交形成曲面,计算两曲面公共部分的形心,即为球心位置.通过确定球心位置,对炮身管的高低角、方位角进行计算,从而检测火炮调炮的性能.实验证明,该算法简单、快速,具有较高的精度.     

新中国成立初期华东地区清剿海匪作战综述

新中国成立初期,地处东南沿海的华东地区匪患严重,尤其是海上匪特活动十分猖獗.华东军区、第三野战军指挥沿海各军区部队采取反击围歼、进剿、海上巡逻游剿等多种作战形式,在较短时间内取得了清剿海匪的重大胜利,粉碎了台湾国民党当局利用海匪"反攻大陆"的企图,巩固了海防,保卫了新生的人民政权.     

以党的创新理论为指导 做好军史编研工作

把科学发展现应用到军史编研工作上,就是要坚持以党的创新理论为指导,认真筹划、科学协调、精心组织,扎实推动军史编研工作又好又快发展.要解放思想,更新观念,为又好又快发展军史编研工作提供强大的精神动力;要科学思维,科学决策,为又好又快发展军史编研工作提供科学的途径方法;要坚持唯物史观,为又好又快发展军史编研工作提供客观的判定标准.     

在英美文学教学中培养大学生批判性思维能力的 创新研究与实践

批判性思维能力的培养对大学生的心理健康、自主学习能力、创新能力以及个性发展等方面都有重要的作用.批判性思维是大学生综合素质的体现.大学英语提高课程"英文小说与电影"以英美文学中经典小说为教学内容,旨在通过英美文学的教学培养学生的批判性思维能力,本课程改变传统教学中教师"一言堂"的教学模式,采用混合式教学模式和问题导向式学习方法,营造批判性思维学习氛围,通过让学生们解读、分析和言说文学经典作品,提高学生的批判性思维能力.     

Trade credit contract in the presence of retailer investment opportunity

This paper presents a model for designing a trade credit contract between a supplier and a retailer that would coordinate a supply chain in the presence of investment opportunity for the retailer. Specifically, we study a newsvendor model where the supplier offers a trade credit contract to the retailer who, by delaying the payment, can invest the accounts payable amount and earn returns. We find that when the channel partners have symmetric information about the retailer's investment return, a conditionally concessional trade credit (CTC) contract, which includes a wholesale price, an interest‐free period, and a minimum order requirement, can achieve channel coordination. We then extend the model to the information asymmetry setting in which the retailer's investment return is unobservable by the supplier. We show that, although the CTC contract cannot achieve the coordination in this setting, it can effectively improve channel efficiency as well as profitability for individual partners.     

Algorithm to solve a chance‐constrained network capacity design problem with stochastic demands and finite support

We consider the problem of determining the capacity to assign to each arc in a given network, subject to uncertainty in the supply and/or demand of each node. This design problem underlies many real‐world applications, such as the design of power transmission and telecommunications networks. We first consider the case where a set of supply/demand scenarios are provided, and we must determine the minimum‐cost set of arc capacities such that a feasible flow exists for each scenario. We briefly review existing theoretical approaches to solving this problem and explore implementation strategies to reduce run times. With this as a foundation, our primary focus is on a chance‐constrained version of the problem in which α% of the scenarios must be feasible under the chosen capacity, where α is a user‐defined parameter and the specific scenarios to be satisfied are not predetermined. We describe an algorithm which utilizes a separation routine for identifying violated cut‐sets which can solve the problem to optimality, and we present computational results. We also present a novel greedy algorithm, our primary contribution, which can be used to solve for a high quality heuristic solution. We present computational analysis to evaluate the performance of our proposed approaches. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 236–246, 2016     

关于我国发展新型固定翼舰载机的几点建议

随着我国航母事业的发展,舰载机研发与制造产业得到了相应的发展。但是由于我国舰载机研发与制造产业起步晚,舰载机在技术性能等方面相比于西方国家还存在一定差距。文章以美国F-35"闪电Ⅱ"飞机研发历程为依据,对我国发展新型固定翼舰载机在设计、研发和维护等方面提出了建议,总结了值得我国研发人员借鉴的经验和教训。     

泄漏类火灾原因的认定

本文通过具体实例分析了泄漏的危险性以及因此而引发火灾的原因及其认定。