二体算符矩阵元的一个注记

本文补充了文献[1]中遗漏的二体算符矩阵元,包括玻色子(β,γ)→(α,α),(α,α)→(β,γ),(α,α)→(α,β),(α,β)→(β,β),(α,γ)→(γ,β)跃迁矩阵元和费米子(α,γ)→(γ,β)跃迁矩阵元,并给出了无遗漏地计算二体算符全部非零矩阵元的简便方法。本文结果与Stater-Condon规则一致,并已用于研究生《高等量子力学》教学。     

建筑物内电梯自动扶梯的火灾安全

本文阐述了电梯和自动扶梯在火灾时对建筑物及人员产生的不利影响 ,并针对其危险性提出解决方法。     

CAN总线在柴油机并车监控系统中的应用研究

介绍了 CAN总线的技术特点 ,以基于 CAN总线的并车监控试验系统的研制为例 ,论述了新型 CAN总线网络式监控系统的软硬件配置方案、技术实现途径及其重要意义 ,展望了 CAN总线在自动化领域的广阔发展前景 .     

红外脉冲强光辐射产生技术研究

定向红外脉冲强光辐射技术是定向红外对抗中的关键技术,主要用来破坏敌方精确制导武器或C4I系统的红外传感器。本文进行了三种产生技术的研究,即爆炸激励惰性气体,多丝电爆激励惰性气体和多点同步爆燃药物。在同步爆燃产生技术的研究中,当有效载荷弹药为0.2kg时,在距离源50m处得到三个波段(1～3、3～5、8～12μm)的辐射强度为(2.00～3.55)×l05W／Sr,脉冲半高宽为约20ms的强红外辐射脉冲。     

Efficient budget allocation strategies for elementary effects method in stochastic simulation

This paper focuses on extending the Morris' elementary effects method (MM) for sensitivity analysis/factor screening originated in the context of deterministic computer experiments to the stochastic simulation setting. Given a fixed simulation budget to expend, the main objective is to provide efficient and accurate estimates of main and interaction (or nonlinear) effects coined by the standard MM for characterizing the importance of each factor, despite the impact of simulation errors. Taking into account both the factor/input sampling uncertainty rooted in MM and the random errors inherent in a stochastic simulation, we develop efficient budget allocation strategies for implementing MM in this new context. Under each strategy proposed, we derive its corresponding optimal budget partition and optimal budget allocation rules. Numerical results corroborate the practical effectiveness of the proposed budget allocation strategies.     

基于Fuzzy DEMATEL的军民融合后勤保障制约因素研究

现代后勤就是军民融合后勤。从思想性禁锢、体制性障碍、结构性矛盾和政策性瓶颈4个维度,系统地分析军民融合后勤保障存在的矛盾问题,构建军民融合后勤保障制约因素体系。引入Fuzzy DEMATEL方法,定量分析制约因素间的影响关系及作用机理,遴选出制约军民融合后勤保障深度发展的关键因素,为促进军民融合后勤保障健康有序发展,提供一定的理论依据和实用的操作方法。研究表明,迫切需要找到化解制约因素的有效途径,推动军民融合后勤保障向更高层次、更广范围、更深程度发展。     

美军地理空间工程对陆军作战支援主要问题研究

近年来,由于编制的调整、技术的进步和最佳准则的出现,美军地理空间工程支援保障能力有了大幅提高。文章剖析美军地理空间工程的内涵、力量构成、支援陆军作战的主要能力和主要内容。研究表明,美军地理空间工程对陆军的作战支援是成体系的且高度融合,其先进的保障模式值得借鉴。     

Optimal inventory and dynamic admission policies for a retailer of seasonal products with affiliate programs and drop‐shipping

This article investigates the optimal inventory and admission policies for a “Clicks‐and‐Bricks” retailer of seasonal products that, in addition to selling through its own physical and online stores, also sells through third‐party websites by means of affiliate programs. Through postings on partners' webpages, an affiliate program allows a retailer to attract customers who would otherwise be missed. However, this retailer needs to pay a commission for each sale that originates from the website operators participating in the program. The retailer may also refer online orders to other sources (such as distributors and manufacturers) for fulfillment through a drop‐shipping agreement and thus earns commissions. This would be an option when, for example, the inventories at the physical stores were running low. Therefore, during the selling horizon, the retailer needs to dynamically control the opening/closing of affiliate programs and decide on the fulfillment option for online orders. On the basis of a discrete‐time dynamic programming model, the optimal admission policy of the retailer is investigated in this paper, and the structural properties of the revenue function are characterized. Numerical examples are given to show the revenue impact of optimal admission control. The optimal initial stocking decisions at the physical stores are also studied. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009     

UTD应用中椭圆柱面反射点的解析求解

射线寻迹是应用一致性绕射理论(UTD)分析电大尺寸目标电磁辐射和散射特性的关键步骤.结合费马原理及反射定律,推导了椭圆柱面反射点的解析表达式,并给出了应用此表达式得到的部分椭圆柱反射点及翼型模型的远场方向图结果.经与FEKO仿真比较证明结论是正确的,并能提高场值计算的速度和精度.     

小波包变换和支持向量机模拟电路故障诊断方法

为提高模拟电路故障诊断效率,将小波包变换和支持向量机结合起来,提出了一种完整的模拟电路故障快算检测和准确定位的方案.利用小波包变换对电路输出电压信号进行多层分解,提取各频带的能量作为故障特征,给出了具体的特征提取方法;利用支持向量机的多分类一对一方法,完成电路的故障定位,同时实现了小波函数的选择.在一模拟电路的故障仿真实验中,通过与BP,RBF和PNN等神经网络对比,结果显示该方法的诊断效率是很高的.