贝卡谷地之战述评

1982年第5次中东战争期间,以色列空军与地面部队密切协同,在2天多的时间里一举摧毁叙利亚部署在贝卡谷地的19个地空导弹连,并在空战中击落了叙军70架飞机,创造了世界压制防空作战史上的经典战例。以军能取得如此辉煌的胜利,其经验颇有借鉴价值：第一,认真吸取第4次中东战争的教训,切实弥补薄弱环节;第二,勇于抛弃习惯思维,创造性地解决战术难题;第三,既重视学习引进又重视自主研制先进武器装备;第四,不断强化忧惠意识,严格推进部队训练。     

论当代革命军人核心价值观的利益基础

当代革命军人核心价值观有其坚实的利益基础:人民利益高于一切,国家利益是人民利益的政治表现形式,党是人民利益的忠实代表,军人的利益有机地融合在人民利益和国家利益之中,军队的使命和军人的职责是为党的事业、为人民利益和国家利益奋斗.     

加强党员干部党性修养必须坚持“四个统一”

加强党员干部党性修养,必须坚持理论与实践相统一,用党的创新理论武装头脑、推动工作;坚持继承光荣传统和弘扬时代精神相统一,永葆共产党员的先进性;坚持改造客观世界和改造主观世界相统一,努力做到刻苦学习、埋头苦干;坚持加强个人修养和接受教育监督相统一,在自觉践行从严治党要求中增强党性.     

应用虚拟样机技术优化设计卡钳

分析了传统设计方法的弊端,介绍虚拟样机技术这一全新的设计方法.以应用动力学仿真软件ADAMS建造卡钳虚拟样机优化设计的实例,说明虚拟样机技术可以缩短开发周期、降低成本,提高设计质量和可靠性.     

Dynamic pricing in a trade-in program with replacement and new customers

Trade-in programs have been widely adopted to enhance repeat purchase from replacement customers. Considering that a market consists of replacement and new segments, we study the joint and dynamic decisions on the selling price of new product (hereafter, “selling price”) and the trade-in price involved in the program. By adopting a vertical product differentiation choice model, we investigate two scenarios in this paper. In the base model, the manufacturer has sufficiently large production capacity to fulfill the customer demand. We characterize the structural properties of the joint pricing decisions and compare them with the optimal pricing policy under regular selling. We further propose a semi-dynamic trade-in program, under which the new product is sold at a fixed price and the trade-in price can be adjusted dynamically. Numerical experiments are conducted to evaluate the performance of the dynamic and semi-dynamic trade-in programs. In an extended model, we consider the scenario in which the manufacturer stocks a batch of new products in the beginning of the selling horizon and the inventory cannot be replenished. Following a revenue management framework, we characterize the structural properties with respect to time period and inventory level of new products.     

A guarantee rate optimization model for wastewater treatment system design under uncertainty

We consider a design problem for wastewater treatment systems that considers uncertainty in pollutant concentration levels at water sources. The goal is to optimize the selection of treatment technologies and pipeline connections, so that treated wastewater can achieve specified effluents discharge limits as well as possible. We propose a new two-stage model to optimize a set of guarantee levels, that is, the maximum concentration level of source pollutants for which treated wastewater can be compliant with discharge limits. In the first stage, treatment technologies and pipeline connections are selected. In the second stage, when pollutant concentration levels are revealed, wastewater distribution and mixing are determined. A key attractiveness of the proposed guarantee rate optimization model is that it can be simplified into a single-stage mixed-integer linear program. In our numerical experiments based on real-world pollutants data, the guarantee rate model demonstrates its advantages in terms of computational efficiency, scalability and solution quality, compared with the standard probability maximization model. Finally, the methodology proposed in this paper can also be applied to other two-stage problems under uncertainty with similar uncertainty characteristics.     

Relative Aging of Coherent Systems

In this article, we carry out the stochastic comparison between coherent systems through the relative aging order when component lifetimes are independent and identically distributed. We make use of the signature to characterize the structure of coherent systems, and derive several sufficient conditions under which the compared systems with the common size can be ordered in the sense of relative aging. Specially, we present some scenarios wherein the better a coherent system is, the faster it ages. Moreover, we discuss the relative aging of dual systems as well. Several numerical examples are provided to illustrate the theoretical results. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 345–354, 2017     

微重状态下带隔板球形贮箱中静液面形状优化算法

本文提出了一种用于计算微重力下带隔板球形贮箱内的静液面形状的综合寻优算法,在Bond 数0.01～300,接触角0～90°,充液比0.01～0.99范围内所做的大量计算表明:该算法收敛性好,收敛速度快,精度高。     

生产玄武岩纤维用玄武岩熔体黏度实验研究

玄武岩熔体黏度是玄武岩熔质产品生产最重要的工艺参数,黏度的大小及稳定性直接影响玄武岩纤维生产的稳定性和产品品质。通过实验得到不同温度下玄武岩熔体黏度值,经数学拟合得到一定温度范围内的黏度-温度关系曲线和回归方程,拟合出的回归方程可以用于预测该熔体在其他温度下的黏度值。实验表明:玄武岩的化学组分对黏度有较大影响,本实验所用玄武岩可用于拉丝成纤;其结果可为工艺参数的选择提供相应依据。     

zn及Zn／Si02复合添加剂的摩擦学性能

实验室自制了锂基润滑脂,通过四球试验研究zn作为锂基润滑脂添加剂在不同工况条件的摩擦学性能,利用光学显微镜和EDX分析了磨斑表面形貌及元素组成,探讨了zn的润滑作用机理,并对zn与SiO2不同复配方案的摩擦学性能进行了研究。结果表明：在低载荷条件,zn能更显著地提高锂基润滑脂的抗磨性能;在中高载荷条件,zn同时具有减摩抗磨性能,但对Pn值的提高没有太大帮助。EDX能谱分析表明磨斑表面存在特征zn元素,说明zn能够在摩擦表面沉积,形成摩擦学性能显著的表面润滑层;同时,zn与硬质颗粒SiO2在适宜的复配比例时具有一定的协同效应,能提高锂基润滑脂的摩擦学性能．