失流事故冷却剂流量下滑的统一表达式

导出了压水堆失流事故下冷却剂流量下滑的统一表达式,作了实例计算,并对结果进行了讨论。     

基于压缩感知的曲线SAR孔径优化和目标三维特征提取

基于压缩感知理论研究了曲线合成孔径雷达的曲线孔径优化和目标三维特征提取。在建立曲线合成孔径雷达回波信号稀疏表示模型的基础上,基于压缩感知采样矩阵设计的不相关原则,给出了曲线孔径优化设计的评价准则,并利用基于全局优化的基追踪方法实现了目标三维特征提取。仿真结果验证了孔径优化评价准则的正确性和基追踪方法在目标特征提取处理中的有效性。     

A quasi-isentropic model of a cylinder driven by aluminized explosives based on characteristic line analysis

A quasi-isentropic study on the process of driving a cylinder with aluminized explosives was carried out to examine the influence of the aluminum (Al) reaction rate on cylinder expansion and the physical parameters of the detonation products. Based on the proposed quasi-isentropic hypothesis and relevant isentropic theories, the characteristic lines of aluminized explosives driving a cylinder were analyzed, and a quasi-isentropic model was established. This model includes the variation of the cylinder wall velocity and the physical parameters of the detonation products with the Al reaction degree. Using previously reported experimental results, the quasi-isentropic model was verified to be applicative and accurate. This model was used to calculate the physical parameters for cylinder experiments with aluminized cyclotrimethylenetrinitramine explosives with 15.0 % and 30.0 % Al content. The results show that this quasi-isentropic model can be used not only to calculate the cylinder expansion rule or Al reaction degree, but also to calculate the physical parameters of the detonation products in the process of cylinder expansion. For explosives with 15.0 % and 30.0 % Al, 24.3 % and 18.5 % of the Al was found to have reacted at 33.9 μs and 34.0 μs, respectively. The difference in Al content results in different reaction intensity, occurrence time, and duration of two forms of reaction (diffusion and kinetic) between the Al powder and the detonation products; the post-detonation burning reaction between the Al powder and the detonation products prolongs the positive pressure action time, resulting in a continuous rise in temperature after detonation.     

网络集群现象的特点及对策研究

网络集群现象是指在互联网络环境中,由某一舆论引发,多数人参与,发生观点的群体性激化,从而对现实社会产生一定的冲击和影响的事件。针对网络集群现象的特点,着重从参与主体、交互方式、传播方式、情绪表现、影响因素、处理难度等方面进行研究,并提出防范对策。     

变增益模糊控制器

本文导出了选择比例因子的定量约束条件。以此约束条件为基础,论述了选择比例因子时存在的难以同时兼顾控制系统动态和稳态性能的问题。提出用变增益的方法实现模糊控制。数字仿真结果表明,该方法比通常的固定增益模糊控制具有动态特性好,稳态误差小,以及对被控对象参数变化适应性强等优点。     

航母编队特点及对策研究

为了打赢未来可能发生的高技术局部战争,必须深入研究航母编队特点,积极探索能有效克制航母编队的战法。从航母编队的作战编成、攻防体系和队形以及C3I系统的结构及功能等方面分析了航母编队的特点,重点研究了航母编队C3I系统的特点。针对其特点,提出了几点抗击航母编队的对策。     

基于空时频分析的方位关联算法*

针对跳频组网通信中不同信号间的时频分隔特点,利用时频重心进行目标方位数据关联,提出了空时频方位关联算法。根据提取的时频特征设计空时频测向的核函数,实现了简化的空时频测向算法。根据时频距离设计代价函数,基于匈牙利算法实现了方位关联结果的搜素。根据时频距离选择窗函数的类型和长度,有效避免了信号旁瓣泄露对测向精度的影响,显著提高了密集目标条件下的关联正确概率。数值仿真验证了上述观点。     

水下平台对敌意图识别技术研究

对敌意图识别是作战平台指挥决策的重要依据。针对水下平台意图特征的识别问题,通过对军事应用领域意图识别框架的分析,建立了水下平台的意图识别框架,同时分析了水下平台可用意图特征及提取方法,并提出了一种适于水下平台的意图识别方法。该方法为意图识别技术研究提供一定的参考。     

流体力学中基本方程的特征方程及特征曲面

本文根据偏微分方程组的特征理论,讨论可压缩流体力学基本方程的特征方程和特征曲面,同时结合可压缩流体流动的实用例子,阐述确立其特征方程和特征曲面的具体方法。