炮控系统性能试验中角位移量的几种测量方法

炮控分系统是主战坦克等地面攻坚武器系统的重要组成部分,在坦克全系统定型试验前,必须进行分系统的试验测试。国内目前使用的测试方法和测量设备还停在五六十年代的水平,为适应主战坦克武器系统的发展,必须研制一套测量精度高、自动化程度强的测量设备。介绍了以计算机为中心构建的炮控性能参数测试系统的组成与工作原理,讨论了炮控系统性能试验中利用CCD传感器与坐标靶、PSD传感器与电子靶、点光源与CCD传感器、激光(光纤)陀螺传感器或电测法进行角位移量测量的几种方法。     

特征量积和IHS变换的多源遥感图像融合方法

以高空间分辨率的SAR图像和高光谱分辨率的TM图像为例,提出了一种基于特征量积和IHS变换的多源遥感图像融合方法.该方法首先对TM图像作IHS变换,得到亮度I、色度H与饱和度S三个分量;其次,依据特征量积准则融合TM图像的亮度分量和SAR图像,并用融合结果替代TM图像的亮度分量;最后,作IHS反变换得到融合图像.实验结果表明,与IHS法和小波变换法相比,方法快速、简洁,在保持光谱信息与增强空间细节信息两个方面的综合性能均得到提高.     

油品管输带电问题

以油品管输带电问题为专题,参考大量国外文献,结合笔者近年的研究,以便于石油储运工程技术人员掌握、应用和研究为目的,阐明油流带电的原因是油品与管壁接触后产生双电层,油流带走扩散层中的电荷形成冲动电流;论述冲动电流大小与油品物性、管道结构、油流速度等因素的关系;指出金属管道接地可消除管壁电荷、防止电荷聚积,但不能导走油流里的电荷;说明绝缘管道的要害是管壁会聚积电荷,可能导致刷形放电和击穿放电,缩短管子寿命,危及管输安全。     

C4ISR体系结构产品设计研究

体系结构产品是C4ISR体系结构框架中定义的体系结构描述形式,因此体系结构产品设计是体系结构设计的关键环节。基于C4ISR体系结构框架,对作战节点连接关系、作战活动模型、系统接口描述等核心体系结构产品进行规范化描述,分析了这些核心体系结构产品的数据相关性,提出了体系结构产品设计的检验方法。     

机载MIMO雷达稳健非均匀样本选择方法

针对杂波训练样本中混入干扰目标,导致空时自适应处理技术的杂波抑制性能下降问题,提出一种基于目标知识进行局部稀疏恢复的稳健训练样本挑选方法。该方法利用先验知识确定待检测单元中的目标区域,对整个角度-多普勒平面进行遍历,获得稀疏超完备基。通过变换矩阵对超完备基中对应的目标区域进行"挖空"处理,局部稀疏恢复出超分辨的杂波空时谱,获得杂波协方差矩阵估计。结合广义内积算法,实现非均匀训练样本挑选的过程。与常规结合广义内积方法相比,该方法对于不同干扰强度的训练样本,均有良好的检测效果。经仿真验证,所提方法的检验统计量之间区分度更加明显,对于干扰样本的挑选更加彻底,从而有效地提高了空时自适应处理技术的目标检测性能。     

点阵图形的二次压缩法

基于YH-1巨型机,本文详细介绍了一种计算机图形的二次压缩法。该方法已经在YHHT 图形软件上成功地实现,应用结果证明这种方法是高效的。     

应急净水系统作业性能试验研究

用应急净水系统净化不同水质的原水,以考察其作业性能。结果表明,出水浊度不受原水浊度的影响,且低于1NTU;在试验原水浊度、温度范围内,出水流量较稳定,产水量符合设计要求;出水水质符合生活饮用水卫生标准的要求。     

New product introduction against a predator: A bilevel mixed‐integer programming approach

We consider a scenario with two firms determining which products to develop and introduce to the market. In this problem, there exists a finite set of potential products and market segments. Each market segment has a preference list of products and will buy its most preferred product among those available. The firms play a Stackelberg game in which the leader firm first introduces a set of products, and the follower responds with its own set of products. The leader's goal is to maximize its profit subject to a product introduction budget, assuming that the follower will attempt to minimize the leader's profit using a budget of its own. We formulate this problem as a multistage integer program amenable to decomposition techniques. Using this formulation, we develop three variations of an exact mathematical programming method for solving the multistage problem, along with a family of heuristic procedures for estimating the follower solution. The efficacy of our approaches is demonstrated on randomly generated test instances. This article contributes to the operations research literature a multistage algorithm that directly addresses difficulties posed by degeneracy, and contributes to the product variety literature an exact optimization algorithm for a novel competitive product introduction problem. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

硫化物对石油产品铜片腐蚀影响

讨论了不同硫化物对石油产品铜片腐蚀的影响,结合俄歇电子能谱分析结果,讨论了不同腐蚀级别铜片上硫含量的差异,试验结果表明,腐蚀级别高的铜片上硫含量高,这说明石油产品中的硫化物是形成铜片腐蚀的主要影响因素。     

The impact of demand uncertainty on product line design under endogenous substitution

The existing product line design literature devotes little attention to the effect of demand uncertainty. Due to demand uncertainty, the supply‐demand mismatch is inevitable which leads to different degrees of lost sales depending on the configuration of product lines. In this article, we adopt a stylized two‐segment setup with uncertain market sizes and illustrate the interplay between two effects: risk pooling that mitigates the impact of demand uncertainty and market segmentation that facilitates consumer differentiation. Compared to downward substitution, inducing bidirectional substitution through product line decisions including quality levels and prices can yield greater risk pooling effects. However, we show that the additional benefit from the risk pooling effect cannot compensate for the reduced market segmentation effect. We demonstrate that the presence of demand uncertainty can reduce the benefit of market segmentation and therefore the length of product lines in terms of the difference between products. We also propose three heuristics that separate product line and production decisions; each of these heuristics corresponds to one particular form of demand substitution. Our numerical studies indicate that the best of the three heuristics yields performance that is close to optimality. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 143–157, 2015