邻频干扰对跳频系统通信容量的影响分析

在已知台站布置的跳频系统中,针对邻频干扰对系统通信容量的影响,从信号信息熵角度,分析了接收点干扰信号和噪声的熵功率,利用信号熵和熵功率不等式,推导得出了以信道参数、干扰台站数和可用频点数为变量的系统通信容量公式。仿真结果表明,在干扰台站数较小时,接收点干扰信号的分布取决于信道参数,而不能简单地假设为高斯分布;并验证了所提理论在nakagami信道下的正确性。     

Conflict and fiscal capacity

We examine the role of war in retarding state fiscal capacity in developing countries, measured by tax revenue ratios to GDP. We build a simple theoretical model of a factionalized state, where patronage substitutes for common interest public goods, along with violent contestation over a rent or prize. Our dynamic panel empirical analysis applied to 79 developing countries, during 1980–2010, indicates that war, especially civil war, retards fiscal capacity, along with imperfect democracy, political repression, poor governance, and dependence on oil and macroeconomic mismanagement. High intensity conflict is particularly destructive of state capacity. In countries experiencing low intensity wars, other institutional factors may matter more than war. The diminution of fiscal capacity due to war appears less pronounced after the end of the cold war.     

Why internal conflict deteriorates state capacity? Evidence from Colombian municipalities

Previous work has documented a negative correlation between internal conflict and state capacity. We attempt to shed light on mechanisms that underlie this relationship, using data for Colombian municipalities. We rely on identifying heterogeneous effects of different types of violent events on state capacity, taking advantage of variability across municipalities in the prevalence of specific manifestations of conflict and their intensity. Our findings suggest that events making civilians feel targeted affect the state’s capacity to collect taxes, while those reflecting a stronger military capacity of illegal armies, in particular their large-scale attacks, affect the state’s capacity to provide public goods.     

软硬交替多层膜法向压入过程的有限元分析

采用大变形弹塑性有限单元法,对高速钢基体上的软硬交替多层膜在法向压痕作用下的力学行为,进行了模拟和分析.为了研究膜层数和膜厚的影响,对从单层到16层的不同膜层体系进行了计算.通过对诸如膜层的变形、最大应力随膜层数的变化、界面剪应力分布、表面张应力分布等的分析,得出了这些参数的分布及其对膜层体系的摩擦学性能的影响.这些结果可为多层膜的结构优化设计提供定量的依据.     

当前战区陆军预备役部队民用运力动员初探

我国民用运力资源丰富.自2020年7月1日零时起,预备役部队全面纳入军队领导体制,改由党中央、中央军委集中统一领导.在此背景下,本文对民用运力动员的含义进行了深入剖析,分析了民用运力动员的主要任务和战区陆军部队对民用运力动员的要求,指出了预备役部队民用运力动员所面临的矛盾和困难,提出了推进民用运力动员的几点对策,如健全...     

板的弹塑性弯曲有限元分析中的分层法

论述了板的弹塑性弯曲有限元分析方法 ,对屈服函数的选取作了分析 ,采用分层方法 ,着重分析了对板的弹塑性切线刚度矩阵的建立 ,所论述的分层计算方法对其它非线性板弯曲的有限元计算具有一定的参考价值     

奇型非线性抛物问题的有限元误差估计

引入带权的Sobolev空间 ,讨论了奇型非线性抛物问题的有限元方法 ,在a(u) ,f(u)均满足Lips chitz条件下 ,证明了相应椭圆投影算子Rhu与u之间误差估计式 ,并在一定的假设下 ,给出了奇型非线性抛物问题的广义解u及半离散问题的有限元解uh 误差估计式 .     

考虑摩擦时Diesel循环功率效率特性新析

对有摩擦时Diesel循环进行了有限时间热力学分析 .导出功率和压缩比、效率和压缩比的新关系式 ,进而得到功率效率关系 ,并进行了计算和讨论 ,给出一些有益的结论     

集团军跨域应急作战装备保障能力建设研究

加强应急作战装备保障能力建设,是提高战斗力的重要组成部分。本文针对新体制、新形势下的军队战争形态、使命任务和训练要求,分析了集团军跨域应急作战装备保障的主要特点和当前装备保障存在的不足,并在此基础上,从构建理论体系和装备保障平台、人才队伍建设,装备保障模式以及装备保障实战化训练五个方面给出了集团军跨域应急作战装备保障能力建设和应对措施。     

Pricing and capacity allocation strategies: Implications for manufacturers with product sharing

Emerging sharing modes, like the consumer-to-consumer (C2C) sharing of Uber and the business-to-consumer (B2C) sharing of GoFun, have considerably affected the retailing markets of traditional manufacturers, who are motivated to consider product sharing when making pricing and capacity decisions, particularly electric car manufacturers with limited capacity. In this paper, we examine the equilibrium pricing for a capacity-constrained manufacturer under various sharing modes and further analyze the impact of capacity constraint on the manufacturer's sharing mode selection as well as equilibrium outcomes. We find that manufacturers with low-cost products prefer B2C sharing while those with high-cost products prefer C2C sharing except when the sharing price is moderate. However, limited capacity motivates manufacturers to enter into the B2C sharing under a relatively low sharing price, and raise the total usage level by sharing high-cost products. We also show that the equilibrium capacity allocated to the sharing market with low-cost products first increases and then decreases. Finally, we find that sharing low-cost products with a high limited capacity leads to a lower retail price under B2C sharing, which creates a win-win situation for both the manufacturer and consumers. However, sharing high-cost products with a low limited capacity creates a win-lose situation for them.