农村文化建设对农村社会稳定的双向效应

社会稳定是改革发展的重要前提,而保持农村稳定是全社会稳定的关键。维护农村社会稳定根本途径在于文化建设,但文化建设对农村社会稳定有双向效应。文化建设对农村社会稳定的正面效应有减贫效应、社会结构优化效应、社会控制效应、社会心理优化效应和社会化效应,而文化建设的受益不均衡效应、虚化效应、过度社会动员效应及其信息失稳效应等又不利于农村社会稳定。因此,要充分重视农村文化建设的积极作用,也要清醒认识其负面效应,并为维护农村社会稳定考虑扬正抑负的对策。     

采用终端滑模控制实现交会对接逼近段姿态跟踪

针对交会对接逼近段追踪器的姿态控制问题,采用反馈线性化理论推导了非线性姿态动力学方程的相变量模型.基于导出的姿控模型,引入模型误差和随机噪声,结合终端滑模控制理论,给出了能够在有限时间内完成姿态跟踪,并使状态跟踪误差收敛的控制律的设计方法.对具有扰动项的系统,仿真结果仍能满足交会任务对时间的要求,且姿态角跟踪误差趋于0,说明控制律对相变量系统的姿态跟踪控制具有较好的鲁棒性.     

利用星载相机成像信息进行卫星姿态确定的方法(英文)

随着卫星定姿精度要求的日益提高,仅用常规卫星敏感器已经不能满足高精度定姿要求,针对该问题,提出一种利用星载相机的单点成像信息进行卫星姿态确定的算法,根据相机成像原理推导出卫星姿态角与像点位置的关系,结合数字相机的特殊成像方式,建立了用误差四元数描述的线性相机测量残差模型,并给出联合常规姿态敏感器进行联合姿态确定的方案.仿真结果证明星载相机的信息的引入使得稳态姿态估计精度由0.002 6°提高到0.000 69°,并且加快了滤波收敛速度.     

四元数在火控中的应用

介绍了四元数的定义、代数运算、三角形式和指数形式以及球面表示形式;综述了四元数在刚体姿态控制,计算机三维图像旋转,彩色图像处理和信号处理分析等实际应用中表示的物理含义,着重探讨了四元数理论在火控领域中应用方法,并对比传统欧拉角火控模型,分析了应用四元数火控模型的优点。最后从理论上得出,四元数理论方法在常规兵器火控系统有广阔的应用前景。     

同轴环缝气流作用下锥形液膜线性稳定性分析

为了分析气液同轴离心式喷嘴的雾化机理，对同轴气体作用下的锥形液膜进行时间稳定性分析，推导同轴气体作用下锥形液膜的色散方程，建立离心式喷嘴出口参数预测模型，用于数值求解色散方程。结果表明：喷嘴出口液膜厚度随着喷注压降的增加而减小，喷雾锥角、液膜速度和轴向速度随着喷注压降的增加而增大。同轴气体作用下液膜由正弦模式的表面波主导，因为正弦模式的表面波增长率远大于曲张模式的表面波增长率。当环缝气体喷注速度较小时，增加气体速度会减小气液相对速度，从而减弱气液相互作用，使得液膜主导表面波增长率和频率减小、破碎时间和破碎长度增加。而当环缝气体速度超过一个临界值后，随着气体速度的增大，液膜主导表面波增长率和频率迅速增大，破碎时间和破碎长度迅速减小。     

社会稳定视角下的伊斯兰教社会功能探析——以新疆地区为例

本文从宗教的社会功能角度出发，探讨了新疆伊斯兰教发展对其地区社会稳定产生的多方面影响。并对伊斯兰教教旨教义进行了分析，论述了引导其发挥宗教的正功能，尽可能缩小和克服其消极影响，更好地与社会主义社会相适应的意义，以及与建设和谐新疆相互促进的重要性和可行性。     

Imperial nostalgia,the liberal lie,and the perils of postmodern counterinsurgency

Since 9/11, counterinsurgency is back in fashion; the ‘war on terror’ has even been branded a ‘global counterinsurgency’. However the context within which counterinsurgency originally arose is critical to understanding the prospects for its present success; the radically changed environment in which it is currently being conducted casts into considerable doubt the validity of the doctrine's application by many national militaries currently ‘rediscovering’ this school of military thought today. Above all, classical counterinsurgency was a profoundly imperial, state-centric phenomenon; consequently it only rarely faced the thorny issue of sovereignty and legitimacy which bedevils and may doom these same efforts today.     

The challenges of Iraq: putting US Army stability operations doctrine to the test

The US Army develops doctrine as a set of fundamental principles that guide its actions in support of national objectives. Recently, those national objectives required stability operations, with increasing scope and frequency. This study examines whether existing US Army doctrine adequately fulfilled its role as a guide to tactics in addressing the challenges that Army forces faced in the first 15 months of the war in Iraq. Field Manual 3-24 Counterinsurgency has remedied many deficiencies, but several remain to be addressed to offer commanders better guidance in the face of the many complex challenges they face in stability operations.     

Russia and Strategic Conventional Weapons:

ABSTRACT

Russian political leaders and military strategists are growing increasingly concerned about “strategic conventional weapons”—a broad category that appears to include all non-nuclear, high-precision, standoff weapons—and about long-range, hypersonic weapons, in particular. These concerns are complex and multifaceted (and, in some cases, contradictory), but chief among them are the beliefs that strategic conventional weapons could prove decisive in a major conflict and that Russia is lagging behind in their development. US programs to develop and acquire such weapons—namely, the Conventional Prompt Global Strike program—are of great concern to Russian strategists, who argue both that the United States seeks such weapons for potential use against Russia—its nuclear forces, in particular—and because strategic conventional weapons are more “usable” than nuclear weapons. Asymmetric responses by Russia include increased reliance on tactical nuclear weapons, efforts to enhance the survivability of its nuclear forces, and investments in air and missile defenses. There is also strong—but not completely conclusive evidence—that Russia is responding symmetrically by attempting to develop a long-range, conventionally armed boost-glide weapon.     

Boost-glide Weapons and US-China Strategic Stability

ABSTRACT

The United States and China are testing boost-glide weapons, long-range strike systems capable of flying at Mach 5 or faster through the upper atmosphere. For the United States, these systems would provide a conventional prompt global strike capability, which, together with US ballistic missile defense programs, Chinese experts regard as a threat to China's ability to conduct nuclear retaliation. This perception is encouraging the Chinese military to modify its nuclear posture in ways that tend to create greater risks for both sides. If China's own boost-glide systems are meant to carry nuclear payloads only, their deployment would not fundamentally alter the current situation between the two states. However, if they were conventionally armed or dual-purpose, or if the United States could not determine the payloads they carried, the deployment of Chinese boost-glide systems could compound problems of strategic stability created by the introduction of ballistic missile defense, antisatellite, and antiship ballistic missile capabilities. If the technical hurdles can be overcome, it may be difficult for the two sides to refrain from these deployments in the absence of strong mutual trust or an established arms-control relationship. New confidence-building measures and expanded mutual transparency are warranted to avoid creating new dangers.