CCD专用电源的研制

本文给出了ＣＣＤ专用电源的设计方案。该电源具有高效率、抗浪涌、工作电压范围宽、直流输出与交流隔离等优点。     

一种新型高效程控斩波器的设计

提出利用当前国际先进专用开关稳压电源集成芯片,设计高效、低纹波的新型新波器的原理及电路实现,并在实验条件下证明了本设计的工程适用性。     

The impact of animal welfare regulations on firms' product offerings: Humane or organic product?

Increased public concerns about animal welfare have spurred new regulations to improve animals' treatment and living conditions. We study how these regulations affect firms' product offerings, prices, and profits. We consider two competing animal agriculture supply chains, each consisting of a supplier and a buyer. New regulations require firms to choose between offering humane or organic products, which are differentiated by animals' living conditions. We find that consumers' growing awareness of animal welfare encourages firms to offer organic products, which require the highest standards for animals' living conditions. We also show that tightening humane product standards and loosening organic product standards encourage firms to offer organic products—but with distinct pricing implications. The former leads to higher retail prices whereas the latter may lower retail prices. Depending on costs and consumers' awareness of animal welfare, a humane product may be priced higher or lower than an organic product. Furthermore, we provide conditions under which a regulator should offer a unit-cost or an investment cost subsidy to improve social welfare. We show that subsidies can encourage firms to change from offering humane to organic products, or vice versa, to enhance total social welfare.     

核裂变链式反应过程中裂变中子密度计算公式建立的研究

针对作者先前发表的研究成果--"考虑缓发中子在内的中子倍增公式"中存在的随着核裂变代数的增加,公式的项数迅速增加,给计算造成不方便的问题,采用将缓发中子的先驱核浓度累积的方法建立了"改进的考虑缓发中子在内的中子倍增公式".该公式简单明了,计算方便,对核裂变链式反应裂变中子密度的计算有极其重要的意义.     

特大灾害事故现场后勤保障探析

面对特大灾害事故大量增多 ,如何有效处置特大灾害事故 ,不仅使消防部队的灭火救援工作面临着新的考验 ,而且也给部队的后勤保障工作提出了新的要求。通过分析特大灾害事故的特点 ,探讨建立和完善特大灾害事故现场后勤保障新机制的必要性及其对策措施。     

逆变器驱动电机系统EMC模型建立及直流侧传导干扰研究

针对逆变器驱动电机系统建立了EMC(电磁兼容)模型,其中改进了三相异步电机的EMC模型,通过构建实验系统,对系统的直流侧传导干扰进行了测量,并采用Simulink工具对系统进行了时域传导干扰分析,仿真结果与实验吻合,结果显示主要传导干扰出现在逆变器载频的整数倍附近,在0～150kHz频段中随频率增加,传导干扰增大,其中共模传导干扰占主要成分.     

Contracts and coordination: Supply chains with uncertain demand and supply

Considering a supply chain with a supplier subject to yield uncertainty selling to a retailer facing stochastic demand, we find that commonly studied classical coordination contracts fail to coordinate both the supplier's production and the retailer's procurement decisions and achieve efficient performance. First, we study the vendor managed inventory (VMI) partnership. We find that a consignment VMI partnership coupled with a production cost subsidy achieves perfect coordination and a win‐win outcome; it is simple to implement and arbitrarily allocates total channel profit. The production cost subsidy optimally chosen through Nash bargaining analysis depends on the bargaining power of the supplier and the retailer. Further, motivated by the practice that sometimes the retailer and the supplier can arrange a “late order,” we also analyze the behavior of an advance‐purchase discount (APD) contract. We find that an APD with a revenue sharing contract can efficiently coordinate the supply chain as well as achieve flexible profit allocation. Finally, we explore which coordination contract works better for the supplier vs. the retailer. It is interesting to observe that Nash bargaining solutions for the two coordination contracts are equivalent. We further provide recommendations on the applications of these contracts. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 305–319, 2016     

Resequencing with parallel queues to minimize the maximum number of items in the overflow area

This article treats an elementary optimization problem, where an inbound stream of successive items is to be resequenced with the help of multiple parallel queues in order to restore an intended target sequence. Whenever early items block the one item to be currently released into the target sequence, they are withdrawn from their queue and intermediately stored in an overflow area until their actual release is reached. We aim to minimize the maximum number of items simultaneously stored in the overflow area during the complete resequencing process. We met this problem in industry practice at a large German automobile producer, who has to resequence containers with car seats prior to the assembly process. We formalize the resulting resequencing problem and provide suited exact and heuristic solution algorithms. In our computational study, we also address managerial aspects such as how to properly avoid the negative effects of sequence alterations. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 401–415, 2016     

基于SWOT分析的我国海上方向空中安全形势及对策措施

海上方向是强敌对我实施战略围堵和遏制的主要方向。随着美国国防战略重回大国竞争,其遏制中国的手段推陈出新,尤其是在海空方向对我施压强度频度与日俱增。文章运用SWOT方法对我国海上方向空中安全形势进行了全面分析,认为优势体现在联合作战指挥体制、国防动员能力、列装新型防空武器等方面,劣势体现在战场建设滞后、预警探测拦截打击能力不足等方面,机遇体现在中美共识与相对稳定的周边环境,威胁体现在强敌对我的侦察威慑、空天打击、海空封锁。通过构建我国海上方向空中安全的SWOT分析矩阵,提出要进一步深化改革,加强军队与地方、平时与战时、作战力量和作战环节的“三个统筹”,发展新型防空、预警装备,以及加强沿海防空战场建设等。     

脉冲功率电源故障诊断方法研究

脉冲功率电源是电磁发射系统中最容易发生故障的薄弱环节,脉冲功率电源故障会使整个系统性能下降。针对脉冲功率电源故障,提出基于多层小波分析提取故障信息的模式搜索支持向量机故障诊断方法。通过建立脉冲功率电源的软故障模型,进行仿真分析获得电流故障数据样本,对故障样本进行离散小波分解,获得指定层细节信息的小波系数作为故障特征量;对故障特征量进行主成分分析,将小波系数进行降维,以便有效地进行故障诊断。通过实验,将所提方法故障诊断结果与其他三种故障诊断结果进行比较,验证了所提方法的有效性。