瞄准式战斗部瞄准策略研究

对不同的瞄准点,瞄准式战斗部对目标毁伤效果不同,为此提出了适用于瞄准式战斗部的瞄准策略,保证了对目标较高的毁伤概率和较好的毁伤效果,解决了起爆之前战斗部的定位问题。     

They protect us,but are they using protection? The potential impact of HIV on the South African Police Service

The drivers of HIV/AIDS in the South African Police Service (SAPS) and impact of the disease on this workforce are neglected areas of research. Existing evidence suggests that while the occupational risk for contracting HIV is low, there are factors associated with the profession that, if left unmanaged, place police officers at risk of contracting HIV. This study's two aims are to identify the potential pathways of HIV infection within policing services and determine the probable impact of HIV/AIDS on SAPS. Through a systematic literature review on HIV/AIDS within police services, and by analysing selected SAPS human resource data, the causal pathways and impact of HIV/AIDS on police services are explored. The study finds that police officers (particularly male officers) are likely to be highly susceptible to HIV infection as a result of risky sexual behaviours born out of occupational characteristics such as high levels of stress, difficult working conditions, living away from home and interactions with sex workers. The problem is exacerbated by the ‘macho’ culture that often prevails among police officers. HIV/AIDS interventions within SAPS must focus on sustained behaviour change. Further, HIV programmes must equip officers with the knowledge and awareness to avoid engaging in high-risk sexual practices that may compromise their health and the effectiveness of the policing service.     

增强小波系数的飞行数据奇异值阈值降噪

针对飞行数据降噪问题,提出了增强小波系数的飞行数据奇异值阈值降噪算法.结合小波系数噪声自相关函数进行飞行数据的最佳分解层小波分解,对高频小波系数先进行增强预处理再进行SVD分解,运用奇异熵理论确定奇异值重构阶次,采用奇异值阈值对小波系数进行处理并重构,得到降噪数据.仿真实验表明,本文算法能获得较高的信噪比,改善了数据质量.     

基于云理论的装备技术状态预测

通过分析装备技术状态变化的模糊性和不确定性等特性,提出了基于云理论的装备技术状态预测模型.根据装备技术状态劣化趋势,给出了基于云模型的时间序列状态预测方法,有效地运用了装备状态评估中的主观预测知识.将历史趋势与当前趋势相结合,实现了基于时间序列的状态预测.最后以某装备的发动机为研究对象,对发动机状态的动态评估值进行了预测,验证了该状态预测方法的有效性.     

增强公安现役部队院校学员社会主义核心价值体系认同对策研究

社会主义核心价值体系决定着中国特色社会主义的发展方向,公安现役部队院校学员是公安现役部队的重要后备力量,经济转型期的阶层分化、多元文化和日益发展的网络文化对学员认同社会主义核心价值体系有不同程度的影响.应当在公安现役院校的思想政治教育中,把社会主义核心价值体系贯穿于两课教学的全过程,帮助学员在多元文化中提高辨别能力,探索运用网络进行思想政治教育的新途径、新机制.     

Why a small probability of terror generates a large macroeconomic impact

The basic narrative of bargaining theory predicts that, all else equal, anarchy favors concessions to challengers who demonstrate the will and ability to escalate against defenders. For this reason, post-9/11 political science research explained terrorism as rational strategic behavior for non-state challengers to induce government compliance given their constraints. Over the past decade, however, empirical research has consistently found that neither escalating to terrorism nor with terrorism helps non-state actors to achieve their demands. In fact, escalating to terrorism or with terrorism increases the odds that target countries will dig in their political heels, depriving the non-state challengers of their given preferences. These empirical findings across disciplines, methodologies, as well as salient global events raise important research questions, with implications for counterterrorism strategy.     

基于改进LMS算法的复合材料超声检测缺陷识别

在径向基函数（RBF）神经网络实现无人机复合材料超声检测脱粘缺陷识别时,针对最小均方（LMS）算法在确定网络输出权值时存在稳态失调误差和收敛速度相矛盾的问题,提出一种改进的自适应的变步长LMS算法．该算法根据反馈误差自适应确定步长,通过引进动量项加快收敛速度．将改进LMS算法应用到RBF网络缺陷识别中,结果表明该方法在稳态失调误差较小的情况下,能快速确定RBF网络的权值．改进的RBF网络能够较好地识别超声检测脱粘缺陷．     

基于灰色关联投影法的空中加油机驻场选址评价

提出了一种基于灰色关联投影法的空中加油机驻场选址评价方法,分析了空中加油机驻场选址影响因素,设计了评价指标体系,并运用熵值理论客观赋权,构建了加权灰色关联决策矩阵。通过比较备选方案与理想方案灰色关联投影角,根据灰色关联投影值对备选方案进行优劣排序。算例分析结果符合现实场站选择条件,说明该方法能够有效解决空中加油机驻场选址问题。     

基于差分和神经网络的同步辐射光源图像压缩方法

针对常见的图像无损压缩方法效果不佳问题,提出了一种基于图像差分和神经网络的同步辐射光源图像无损压缩方法。通过图像差分以减少图像序列内部的线性相关性,训练神经网络模型以学习图像序列内部的非线性相关性,得到预测概率分布,结合算术编码压缩。为加速预测和编码过程,将像素值按位分裂为两部分进行并行处理。基于上海同步辐射光源图像的测试表明,相较于便携式网络图形、JPEG2000和自由无损图像格式等,该方法可将压缩率提升20%以上,像素位分裂可以缩短30%的模型预测和编码时间。     

2A12铝合金焊接接头超声冲击处理前后拉伸性能分析

为克服铝合金薄板焊接接头强度偏低、韧性不足的缺点,用ER5356焊丝对不同厚度的2A12铝合金板材进行了手工氩弧焊接,并采用超声冲击处理对焊接接头进行全覆盖强化处理。采用金相显微镜观察了处理和未处理焊接接头的显微组织结构,对接头的力学性能进行了测试分析,分析了超声冲击处理改善2A12铝合金焊接接头力学性能的机理。结果表明：铝合金焊接接头经超声冲击强化处理后,6 mm和4 mm厚板材对接接头的抗拉强度分别提高了17.4%和23.7%,延伸率分别提高了28%和44%,焊缝表层组织得到明显细化。分析认为：晶粒大幅细化、组织致密化和缺陷减少,是超声冲击处理改善铝合金焊接接头抗拉伸性能的主要原因。