采用区分性幅相联合字典学习的低截获概率信号分离方法

为解决采用字典学习的信号分离方法存在的相位信息缺失和子字典交叉表示问题，提出一种区分性幅相联合字典学习方法。该方法针对相位信息缺失问题，构建了幅相联合字典模型；针对混合信号在联合字典上投影时存在的交叉表示问题，基于区分性字典学习思想提出在字典学习过程目标函数中加入交叉表示抑制项。仿真结果表明：幅相联合字典能够充分表示典型低截获概率信号的幅相信息，交叉表示抑制项能有效抑制信号间的交叉表示，算法具有良好的分离性能。     

电磁发射用分段供电六相圆筒式直线感应电动机数学模型

为研究新型分段供电六相圆筒式直线感应电动机的运行规律，针对其不对称运行的特点，采用磁动势理论推导了气隙中与空间位置无关的脉振磁场的电感矩阵表达式，通过将其引入abc坐标系下对称的电机数学模型，从而构建了描述六相圆筒式直线感应电机不对称的数学模型。在Simulink环境下，采用隐式梯形法构建了该不对称模型的系统仿真模型。最后，对样机进行了仿真分析和实验验证，仿真结果与实验数据吻合良好，验证了模型的正确性。     

美国海军酝酿瘦身

7月28日，美国海军人事司令部司令唐纳德·P·奎恩在出席海军顾问协会研讨会时公开表示，迫于当前紧张的军事财政形势，美国海军可能在未来数年内削减部队规模。此前不久，美国海军作战部部长加里·拉夫黑德已经公开表示，美国海军人力成本的逐年上涨是“不可接受和不可持续的”。     

宽带模糊函数的群论解释及小波变换求解

讨论了各种形式的宽带模糊函数,通过群论分析表明,它们都可解释为二维不可约仿射群U表示的矩阵系数,因此其性质可通过对仿射群的研究作出解释。还讨论了宽带模糊函数与小波变换的关系,并由此导出其高效的小波变换求解方法。     

电磁场的对称性与左性电磁波

根据对称性原理，在假设磁单极存在条件下，对Maxwell方程的不对称性进行了改进推导，提出与右性电磁波相对称的左性电磁波，讨论左性电磁波出现的必然性、产生方法及其主要特性。     

超对称性在束缚态上的表示

通过把超对称性守恒荷表达为粒子产生、消灭算子进行分析,我们找到超对称性在超对称场论口袋模型的束缚态上给出有限维表示的条件。由这些条件我们得到选择这种模型的束缚态内组分粒子波函数的准则,它们将使求解这类模型的束缚态的工作显著简化。给出了构造这种表示的例子并指出与“离质壳”表示的关系。还讨论了用超对称场论口袋模型统一描述轻子与夸克的可能性。     

分段供电六相圆筒式直线感应电动机数学模型

为研究新型分段供电六相圆筒式直线感应电动机的运行规律,针对其不对称运行的特点,采用磁动势理论推导了气隙中与空间位置无关的脉振磁场的电感矩阵表达式,通过将其引入abc坐标系下对称的电机数学模型,从而构建描述六相圆筒式直线感应电机不对称的数学模型。在Simulink环境下,采用隐式梯形法构建该不对称模型的系统仿真模型。对样机进行仿真分析和实验验证,仿真结果与实验数据吻合良好,验证了模型的正确性。     

网络数据加密方法及应用策略

针对目前网络在人们的日常生活中的应用越来越广泛这种实际情况，介绍一些与网络数据安全有关的知识，对数据加密模型、对称（私用密钥）加密体制、非对称（公开密钥）加密体制等概念及常用算法进行了介绍。通过列举的方法介绍了加密应用中常用的几种技术，得出了XML加密技术在网络加密技术应用中有不可比拟的优势的结论。     

应用三相系统对称分量法分析六相同步电机的非平衡短路

六相双丫移30°绕组同步电机的非平衡运行,可用对称分量法计算其电流、电压的基频分量。本文阐明了利用三相系统对称分量的分析计算方法,着重分析了各序阻抗。通过几个典型实例的分析可以看出,应用三相系统对称分量分析这种电机的非平衡短路是非常简便的。     

一种新型阻抗匹配平衡变压器及模型试验

为了解决三相电力系统带单相或两相负载引起的不平衡问题,提出了一种新型阻抗匹配平衡变压器。首先,阐述了该变压器的基本原理,建立了基本方程组,并推导出原副边绕组电流之间关系,得出了平衡条件和两相负载的解耦条件以及对应的短路阻抗关系;然后,用ANSOFT12分别对带对称负载和非对称负载进行了仿真,制作了变压器模型并进行了多工况实验,仿真和实验结果验证了理论的正确性。该变压器绕组和铁心结构简单,A相和C相绕组完全对称,便于设计制造。同时,原边有可以引出接地的中性点,副边有容纳三次谐波电流的闭合回路,两相输出电压有公共点,适用于需要单相或两相电源供电的场合。     

Cinematic representations of the Mexican Narco War

This essay provides an overview of the eras of Mexican cinema followed by an analysis of 10 Spanish-language narco cinematic representations, an overview of the eras of American cinema followed by an analysis of 10 English language narco cinematic representations, and a conclusion that compares and contrasts the Mexican and US narco war cinematic experience. Due to divergent national trajectories – Mexico is engulfed in narco violence and corruption while the United States is not – more differences than similarities exist between these national cinematic genres. Dark spirituality themes are also increasingly evident in more recent narco war films.     

IMGS方法与TOR方法之间的比较性定理

给出了一种IMGS方法,在理论上证明了当系数矩阵为不可约的M－矩阵时IMGS方法收敛,且其收敛速度快于基本的TOR迭代法。最后用数值例子验证了所得到的主要结论。     

海军特种作战军事概念格式化描述框架和模板研究

介绍了海军特种作战军事概念格式化描述的方法。对海军特种作战军事概念格式化描述的要求进行深入分析,得出格式化描述的基本思路：用面向对象的方法对海军特种作战军事行动进行分解,给出一套规范和格式,使军事人员对军事行动的格式化表述清晰地提供出技术人员所熟悉的面向对象的概念和机制。根据这种思路对海军特种作战军事行动进行分析,抽取出格式化描述的五个要素：作战单位、动作、作战行动、信息和作战环境,从而建立海军特种作战军事概念格式化描述的框架并详细研究了上述五个要素的描述框架和模板结构。     

Equivalence relations in the theory of repetitive consumption

Preference for food in the function of the time since last consumption and total preference in the function of eating frequency are equivalent mathematical representations of attitudes governing food consumption. The observed and postulated properties of these functions imply a formal correspondence between preference maximizing and variety seeking behavior.     

Some elementary ideas concerning the complexity of system structure

A system of iid Bernoulli components is the starting point in the statistical theory of reliability. This simplification allows for the development of a rich, though elementary, theory for the structure of the system. Two representations play a prominent role in the study of structural reliability. One is the minimal path set representation and the other is the signature representation. By combining the two representations with the Gibbs measure for the state of components, one obtains terms that can be interpreted as the complexity of the system structure. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

A note on some series representations of the integral of a bivariate normal distribution over an offset circle

Consider the problem of computing an offset circle probability under a normal distribution. One approach is to utilize an infinite series representation in which case it is important to have rapid convergence and a good upper bound on the error introduced by consideration of only a finite number of terms of the series. We relate three seemingly different series representations. In particular we show how two series representations for the bivariate case can be obtained by specializing more general results of Harold Ruben.     

First-principles Study of Electronic Structures,Elastic Properties and Thermodynamics of the Binary Intermetallics in Mg-Zn-Re-Zr Alloy

The electronic structures,elastic properties and thermodynamics of MgZn_2,Mg_2Y and Mg_2 La have been determined from the first-principle calculations.The calculated heats of formation and cohesive energies show that Mg_2La has the strongest alloying ability and structural stability.The structural stability mechanism is also explained through the electronic structures of these phases.The ionicity and metallicity of the phases are estimated.The elastic constants are calculated;the bulk moduli,shear moduli.Young's moduli,Poisson's ratio value and elastic anisotropy are derived:and the brittleness.plasticity and anisotropy of these phases are discussed.Gibbs free energy,Debye temperature and heat capacity are calculated and discussed.     

The Manner of Arming Knights for the Tourney: A Re-Interpretation of an Important Early 14th-Century Arming Treatise

Abstract

In this paper, the development of the great helm in England is surveyed from the second half of the 12th century to the beginning of the 16th and the various designs of this distinctive headpiece are compared with representations on European works of art.     

A theory of ideal linear weights for heterogeneous combat forces

Detailed combat simulations can produce effectiveness tables which measure the effectiveness of each weapon class on one side of an engagement, battle, or campaign to each weapon class on the other. Effectiveness tables may also be constructed in other ways This paper assumes that effectiveness tables are given and shows how to construct from them a system of weapon weights each of which is a weighted average of the effects of a given weapon against each of the enemy's weapons. These weights utilize the Perron- Frobenius theory of eigenvectors of nonnegative matrices. Methods of calculation are discussed and some interpretations are given for both the irreducible and reducible cases.