短波长相变光盘记录介质Ge2Sb2Te5薄膜的制备及静态性能研究

研究了６３２．８ｎｍ波长下适用的相变光盘介质Ｇｅ２Ｓｂ２Ｔｅ５薄膜的制备方法和静态光存诸记录特性，发现该薄膜可在１００ｎｓ条件下实现直接重写，在优化膜层结构后，写擦循环次数高达１０＾６，反射率对比度在１５％以上。     

静态偏振风成像干涉仪中光在四面角锥棱镜中的传播规律研究

简述了自行设计的新型静态偏振风成像干涉仪的原理和四面角锥棱镜的分光机理;应用光线追迹法,推导出了主截面内任意光线在棱镜中的传播方向及出射点坐标,建立了平行光束经角锥棱镜后的偏向角和透过率的理论表达式;采用计算机模拟给出了偏向角和透过率随入射角的变化关系曲线;根据静态偏振风成像干涉仪的具体参数确定了四面角锥棱镜的侧面和底面夹角以及底边长度.该研究为静态偏振风成像干涉仪的研制提供了理论依据.     

新型静态偏振风成像干涉仪理论探测误差的分析与计算

简述了新型静态偏振风成像干涉仪的原理,推导出一般情况下系统的Jones矩阵.在此基础上计算了系统中各偏振器件重要参数在非理想情况下对风速和温度探测结果的影响.利用计算机模拟对探测误差进行了分析,并按照系统精度要求从理论上提出了各重要参数的误差容限.该研究为新型静态偏振风成像干涉仪的研制、定标及后期数据处理提供了理论依据. 关键词： 静态偏振风成像干涉仪 Jones矩阵 方位角误差 相位延迟量误差     

Classification of Teleparallel Homothetic Vector Fields in Cylindrically Symmetric Static Space-Times in Teleparallel Theory of Gravitation

In this paper we classify cylindrically symmetric static space-times according to their teleparallel homothetic vector fields using direct integration technique. It turns out that the dimensions of the teleparallel homothetic vector fields are 4, 5, 7 or 11, which are the same in numbers as in general relativity. In case of 4, 5 or 7 proper teleparallel homothetic vector fields exist for the special choice to the space-times. In the case of 11 teleparallel homothetic vector fields the space-time becomes Minkowski with all the zero torsion components. Teleparallel homothetic vector fields in this case are exactly the same as in general relativity. It is important to note that this classification also covers the plane symmetric static space-times.     

P2P保险的道德风险问题研究

伴随信息产业的快速发展和互联网保险的广泛运用,近几年来国际上出现了一种新型保险模式――P2P保险(Peer to Peer Insurance)。该模式基于互联网,通过聚集若干风险类型相似的投保人组建风险共担互助小组,风险互助小组成员间一般是亲戚、朋友等熟人关系。P2P保险形成的相互监督机制和声誉机制,可以较好地解决传统保险市场中存在的道德风险问题。本文利用经济学中的比较静态分析方法,研究了P2P保险的道德风险问题,并从理论上证明了在P2P保险模式下,投保人会倾向于更加努力防范风险以降低出险概率,道德风险问题可以得到有效缓解。     

GPS/SINS伪距(伪距变化率)组合导航系统实验研究

基于挠性捷联惯性测量系统和ＧＰＳ接收机ＯＥＭ板，以伪距（（伪距变化率）残差作为观测信息，实现了ＧＰＳ／ＳＩＮＳ伪距组合导航系统的软硬件设计，并先后在实验室和高速公路上对样机的导航定位、测速以及姿态性能和精度进行了静态考核和动态车载试验。试验结果表明，系统伪距组合滤波器的设计和参数选择正确，样机取得了较好的精度。     

基于博弈理论的大学生考试作弊问题分析

考试作弊已经成为一种社会不良现象,在考试过程中,学生、监考与巡考构成了一个复杂的博弈体系.首先针对100名来自不同大学各个年级的同学进行相关网上问卷调查,客观真实的得出影响作弊行为的相关因素,随后利用完全信息静态博弈理论、建立学生与学生、学生与监考、监考与巡考之间的博弈模型,寻找混合策略纳什均衡;利用演化博弈理论,建立学生与学生之间的动态复制方程来找出系统进化向不良状态演化原因,最终基于原因针对性的改进大学生考试制度.     

城市宜居性特征对商品住宅价格的影响分析——基于中国35个大中城市静态和动态空间面板模型的实证研究

运用空间计量分析技术,以城市宜居性特征体系的27个指标为解释变量,以商品住宅销售价格为被解释变量,通过构建中国35个大中城市的静态和动态空间面板模型,考察了城市宜居性特征对商品住宅价格的影响,探索城市间房价差异的原因。研究表明,静态和动态模型均显示商品住宅价格存在着显著的正向空间相关性,且这种相关性呈现逐渐增强的态势,但静态模型对空间相关性产生过高估计的偏误,动态空间滞后面板模型由于分离了人们的预期对商品住宅价格的影响,使得空间相关性对房价的影响偏误得以部分矫正;城市的经济环境质量、生态环境质量、自然区位条件和基础设施状况等宜居性特征是形成城市间商品住宅价格差异的主要因素,尤其是文化、交通、通讯设施的完善程度和便利程度对商品住宅价格的影响更为明显。但是,人均GDP、每万人中小学校数、固定电话用户普及率、城镇生活污水处理率、空气质量优良率五个指标对城市商品住宅价格的影响表现为负向关系。     

The pressure dependences of elastic and lattice dynamic properties of AlAs from ab initio calculations

Ab initio calculations,based on norm-conserving nonlocal pseudopotentials and density functional theory(DFT),are performed to investigate the structural,elastic,dielectric,and vibrational properties of aluminum arsenide(AlAs) with a zinc-blende(B3) structure and a nickel arsenide(B81) structure under hydrostatic pressure.Firstly,the path for the phase transition from B3 to B81 is confirmed by analyzing the energies of different structures,which is in good agreement with previous theoretical results.Secondly,we find that the elastic constants,bulk modulus,static dielectric constants,and the optical phonon frequencies vary in a nearly linear manner under hydrostatic pressure.What is more,the softening mode of the transversal acoustic mode at the X point supports the phase transition in AlAs.     

The supply voltage scaled dependency of the recovery of single event upset in advanced complementary metal-oxide-semiconductor static random-access memory cells

Using computer-aided design three-dimensional simulation technology,the supply voltage scaled dependency of the recovery of single event upset and charge collection in static random-access memory cells are investigated.It reveals that the recovery linear energy transfer threshold decreases with the supply voltage reducing,which is quite attractive for dynamic voltage scaling and subthreshold circuit radiation-hardened design.Additionally,the effect of supply voltage on charge collection is also investigated.It is concluded that the supply voltage mainly affects the bipolar gain of the parasitical bipolar junction transistor(BJT) and the existence of the source plays an important role in supply voltage variation.