再制造的军事应用探讨

深入了解再制造产生的背景,及时掌握其国内外发展动态,深刻地认识到发展军事装备再制造的必要性和可行性,从而积极推进再制造的军事应用。     

心理战:相关概念与判断

心理战地位的战略性提升,是人类军事斗争发展到今天的必然。文章围绕心理战与物理战、信息战、舆论战、法律战、军事训练、装备创新、文化软实力等问题展开讨论,在对相关概念进行辨析的基础上,提出了作者关于心理战的一系列判断。     

浅析以法律形式控制网络军备竞赛的必要性

网络战是近年来全球军事界相当热的话题,其作为一种全新概念的组织机构,已经开始登上了军事舞台。美国、韩国等国家先后宣布组建网络司令部,引起了全球网络军备竞赛的热潮。文章探讨网络军备竞赛的发展现状和特点,分析以法律形式进行控制的必要性,能够全面系统的了解网络军备竞赛所带来的严重危害,为控制军备竞赛的对策和决策提供一些建议。     

立式金属油罐罐壁与底板连接区域强度分析

采用ABAQUS大型非线性有限元软件,在弹性地基的假设下,对10000m3立式金属油罐进行了水试压状态下的强度分析,计算出两种地基条件下底板的轴向位移和罐壁与底板连接区域的应力分布,所得结果与前人研究成果基本吻合,验证了有限元分析的正确性。从罐壁与底板连接区域的应力曲线可以看出,地基状况对该区域的应力大小有着显著的影响,这为进一步研究复杂边界条件下罐底边缘应力分布以及罐基的优化设计提供了参考。     

马克思主义中国化的历史进程及其启示

马克思主义中国化的历史进程波澜壮阔,绚丽多彩。马克思主义的中国化,不仅使中华民族以独立的姿态重新屹立于世界民族之林,使中国人民真正当家做主人,而且引领中华民族走上实现伟大复兴的康庄大道。马克思主义的中国化给我们留下了许多有益的启示。     

An integrated electric power supply chain and fuel market network framework: Theoretical modeling with empirical analysis for New England

In this article, we develop a novel electric power supply chain network model with fuel supply markets that captures both the economic network transactions in energy supply markets and the physical network transmission constraints in the electric power network. The theoretical derivation and analysis are done using the theory of variational inequalities. We then apply the model to a specific case, the New England electric power supply chain, consisting of six states, five fuel types, 82 power generators, with a total of 573 generating units, and 10 demand market regions. The empirical case study demonstrates that the regional electric power prices simulated by our model match the actual electricity prices in New England very well. We also compute the electric power prices and the spark spread, an important measure of the power plant profitability, under natural gas and oil price variations. The empirical examples illustrate that in New England, the market/grid‐level fuel competition has become the major factor that affects the influence of the oil price on the natural gas price. Finally, we utilize the model to quantitatively investigate how changes in the demand for electricity influence the electric power and the fuel markets from a regional perspective. The theoretical model can be applied to other regions and multiple electricity markets under deregulation to quantify the interactions in electric power/energy supply chains and their effects on flows and prices. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

Estimating failure time distribution and its parameters based on intermediate data from a Wiener degradation model

Instead of measuring a Wiener degradation or performance process at predetermined time points to track degradation or performance of a product for estimating its lifetime, we propose to obtain the first‐passage times of the process over certain nonfailure thresholds. Based on only these intermediate data, we obtain the uniformly minimum variance unbiased estimator and uniformly most accurate confidence interval for the mean lifetime. For estimating the lifetime distribution function, we propose a modified maximum likelihood estimator and a new estimator and prove that, by increasing the sample size of the intermediate data, these estimators and the above‐mentioned estimator of the mean lifetime can achieve the same levels of accuracy as the estimators assuming one has failure times. Thus, our method of using only intermediate data is useful for highly reliable products when their failure times are difficult to obtain. Furthermore, we show that the proposed new estimator of the lifetime distribution function is more accurate than the standard and modified maximum likelihood estimators. We also obtain approximate confidence intervals for the lifetime distribution function and its percentiles. Finally, we use light‐emitting diodes as an example to illustrate our method and demonstrate how to validate the Wiener assumption during the testing. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

FPGA的可调参数白噪声与高斯白噪声生成器

提出了一种基于FPGA硬件的,强度、带宽均可调的白噪声和高斯白噪声生成器,给出了设计的总体框图和设计中的一些要点,阐述了主要部分的原理和理论推导.这种噪声生成器与传统数字电路所组成的噪声生成器相比,采用了新型的FPGA器件,通过利用其中的一些既有功能大大降低了设计的难度,提高了电路调试的灵活性,可用于多种环境下的通信系统测试.     

Optimal control of a production process subject to AOQL constraint

A production process which exhibits a decreasing pattern in the mean quality during the course of production is considered. A lower limit is specified for the quality characteristic of interest, and an item is classified as defective if its quality characteristic is below this lower limit. The major concern of the manufacturer is the average outgoing quality (AOQ). Hence, the process has to be adjusted after a time to avoid producing a large proportion of defective items due to deteriorating quality. To meet consumer specifications, an average outgoing quality limit (AOQL) is specified. A process-control scheme is developed in which decisions as to the upper and lower limit of the process mean are made based upon the choice of an AOQL. We discuss the decision problem of selecting the starting level of the process mean, and the level at which the process mean should be adjusted back to the starting level, so that the AOQ is not larger than AOQL. We consider a cost model which includes a fixed cost for adjustment, and a production cost which is assumed to be a function of the quality level. Due to the complexity of the model, a search procedure is used to find the optimal solution. In addition, an approximate solution which requires only simple calculations is developed, and is shown to be very effective in finding near-optimal solutions.     

短脉冲激光作用下丙酮液池的沸腾研究

采用短脉冲激光加热浸没在丙酮液体里的铂金属薄膜的实验方法并结合数值模拟计算 ,研究了高温升率条件下丙酮液体温度场随时间的变化规律及汽泡行为 ,得出了丙酮液池温度边界层的数量级大约为 4 0～ 70μm,确定了铂镀层表面的反射损失 ,认为薄汽膜的形成和热边界层外移 ,是激光脉冲过后很长一段时间内汽泡依然长大的主要原因