国防生体育教学形式拓展探究

地方高校国防生的体育教学训练往往沿袭了普通大学生的体育教学形式,针对性不强,影响了国防生军事体育素质的提高。通过调查分析指出,国防生体育教学训练形式应从开展新生体能强化训练、军事体育竞赛等方面来进行拓展。     

合成纤维的机械性能对其防弹性能的影响研究

从当前形势出发,分析了防弹材料发展的时代背景;分析了合成纤维的防弹机理;从理论上分析了纤维的机械性能与防弹性能之间的关系;对几种新型防弹纤维的机械性能对其防弹性能的影响,进行了详细对比分析。     

高校体育教学中开展国防教育的思考

通过体育与国防的互动关系入手了,剖析体育既是强身健体的娱乐活动,也是提高国防能力的重要途径和手段;从高校体育教学功能和国防建设的要求上入手,提出在体育教学中开展国防教育是进行国防教育的补充和拓展,并具有得天独厚的优势,有助于形成终身国防意识;开展国防教育的关键是挖掘体育教育的文化功能,把爱国主义贯穿到体育教学中;最后提出将军事体育项目可引入高校体育教学中,既丰富了体育教学的内容,也是承载国防教育的良好载体,推进国防教育的开展和实施。     

基于认知无线电的无线传感网系统设计与实现

为了提高认知无线电传感器网络(CRSN)中的能量使用效率和性能指标,提出了一种新的基于认知无线电的无线传感网系统,该系统中的传感器节点均使用改进的机会频谱接入路由协议,提出的协议能够更好地增加网络的可扩展性和提高网络性能。构建了精确的信道模型以便评估复杂的室内环境不同区域的信号强度,通过实验模拟对提出系统的性能进行评估。模拟结果显示,相比其他两种路由协议,提出的协议在吞吐量、包延迟及总能量消耗方面表现更佳。     

Expansion planning for waste‐to‐energy systems using waste forecast prediction sets

We consider an expansion planning problem for Waste‐to‐Energy (WtE) systems facing uncertainty in future waste supplies. The WtE expansion plans are regarded as strategic, long term decisions, while the waste distribution and treatment are medium to short term operational decisions which can adapt to the actual waste collected. We propose a prediction set uncertainty model which integrates a set of waste generation forecasts and is constructed based on user‐specified levels of forecasting errors. Next, we use the prediction sets for WtE expansion scenario analysis. More specifically, for a given WtE expansion plan, the guaranteed net present value (NPV) is evaluated by computing an extreme value forecast trajectory of future waste generation from the prediction set that minimizes the maximum NPV of the WtE project. This problem is essentially a multiple stage min‐max dynamic optimization problem. By exploiting the structure of the WtE problem, we show this is equivalent to a simpler min‐max optimization problem, which can be further transformed into a single mixed‐integer linear program. Furthermore, we extend the model to optimize the guaranteed NPV by searching over the set of all feasible expansion scenarios, and show that this can be solved by an exact cutting plane approach. We also propose a heuristic based on a constant proportion distribution rule for the WtE expansion optimization model, which reduces the problem into a moderate size mixed‐integer program. Finally, our computational studies demonstrate that our proposed expansion model solutions are very stable and competitive in performance compared to scenario tree approaches. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 47–70, 2016     

战场目标声音识别关键技术研究

战场目标声音探测技术在现代战争中发挥着越来越重要的作用。针对战场目标声音识别的一些关键技术进行了研究。首先分析了目标声音探测技术的军事应用特点,然后对战场典型目标发出的噪声的物理特性进行了分析。最后论述了战场目标声音识别技术中的几种关键技术,重点分析了特征提取中的LPCC、MFCC技术以及分类器中的隐马尔可夫模型,为战场目标声音识别系统的开发奠定了基础。     

kittel型反铁电相变的自由能

根据kittel型反铁电相变对称性的变化 ,选择轴矢量 R作为序参量是合适的。由Landau理论 ,相变温度附近的自由能F就可以写成 R幂级数展开的形式。令 F R=0 ,可得到关于序参量的方程 ,从而获得相变温度与自由能的关系     

基于能量函数的插值代理模型推广能力评价准则

本文分析了插值型代理模型的特性,提出了影响插值代理模型的推广能力的重要因素是代理模型的振荡特性,分析表明:振荡剧烈的代理模型,其推广能力就弱。为了评价代理模型的推广能力,本文提出基于能量函数方法的评价方法。能量函数方法是通过计算代理模型的一阶和二阶导数,得出代理模型的振荡情况来进行评价。能量函数越高,代理模型的振荡越剧烈,因而其推广能力越差。测试函数表明,能量函数方法在评价代理模型推广能力上是有效的。     

THE SECURITY IMPLICATIONS OF CHINA'S NUCLEAR ENERGY EXPANSION

Nuclear energy is an integral part of China's energy strategy and will increasingly contribute to China's total energy supply. China has more than twenty civilian facilities, including power reactors, mines, and enrichment plants, to support its nuclear power program. As China operates more nuclear plants, more nuclear materials will be produced and stockpiled, and more nuclear facilities will be spread around the country. To ensure that this expanded network of nuclear facilities does not increase the risk that nuclear materials will be diverted or become the target of attack, China will need to develop more reliable domestic nuclear security strategies. China is also poised to become a major exporter of nuclear energy technology. China has committed to keeping nuclear technologies out of the hands of dangerous states and/or sub-state organizations, but in order to fulfill its nonproliferation obligations as well as its treaty-based commitment to share nuclear technologies, China will need to strengthen nuclear export controls and practices. This report examines and evaluates security measures at Chinese civilian nuclear power plants and suggests ways to improve them. It also reviews current export control policies and systems, identifies likely challenges to the expanding nuclear sector, and proposes possible solutions.