药型罩材料技术发展现状和趋势

综述了破甲弹药型罩材料的发展现状和趋势，分别对空心装药破甲弹锥形罩技术和爆炸成形弹丸技术进行了药型罩材料发展状况分析，根据约型罩材料特性分析其在破甲弹上的应用趋势。     

Life cycle detection of prestress in large prestressed reinforcement structures

To monitor the stress state of prestressed reinforcement in large reinforcement prestressed structure, two sensing structures, namely the direct spiral-winding structure and sawtooth modulated structure, were designed based on the ordinary communication optical fiber. The sensing theories were analyzed, and the experimental studies were also carried out. The quasi-distributed sensing system based on optical time domain reflective technology was established. The detection wavelength and spatial resolution were analyzed, and the estimation formula of maximal number of sensing point was also given. The results show that the system can realize the quasi-distributed test of measurand with single fiber, which helps to simplify the in-out wires. Moreover it can take on the important task of long-term and continuous monitoring of prestress, which helps to realize the life cycle detection of prestress, and play an important role in the estimating of bridge health state. Foundation item: Project (50278058) supported by the National Natural Science Foundation of China     

Integral feasible prestress of cable domes

Cable domes, first proposed by Geiger, belong to the indeterminate and prestressed assembly. Thus, the geometric stability analysis and the optimal prestress design are very important to understand the behaviour of cable domes. A new specific equilibrium state of integral feasible prestress is presented in this paper. Applying this specific state, the algorithm of geometric stability analysis of cable domes is modified and the optimal prestress of the domes is also designed. The numerical results show the proposed state of integral feasible prestress is unique to a specific dome and it is therefore useful for further research of cable domes.     

基于二次线性调节器的统一电能质量控制器

在分析统一电能质量控制器系统结构和工作原理的基础上，根据UPQC的补偿目标，通过建立其状态空间模型，提出了基于二次线性最优控制的开关控制策略来跟踪电压和电流的指定值。电压和电流的基波分量采用全波移动均值提取傅里叶级数基波序分量的方法得到。利用所提方法对负载电流及电网电压畸变进行了计算机仿真，结果证明了所提方法的正确性。     

一种新型准降压三电平电路的研究

针对开关电源在低输出电压时存在的问题,提出了将开关电源和线性稳压电源结合的电路拓扑.因其具有三电平和两电平电路的优点,故能克服上述问题.理论分析和实验研究结果证明了这些优点.     

预应力FRP增强RC梁界面剪应力分析

粘贴预应力纤维增强复合材料(FRP)片材对土木建筑结构进行加固和修复,可以提高工程效率.从理论分析着手,推导了预应力FRP片材增强RC梁界面层的剪应力的计算公式,分析了预应力作用下FRP片材和混凝土之间的界面层剪应力分布,并通过有限元对碳纤维薄板(CFL)增强RC梁作了数值实验验证.探讨了初始预应力施加量,FRP片材的厚度以及界面层厚度对界面剪应力的影响.     

分布式系统中主机负载预测的一种普适性方法

分布式系统中为了获得高效的动态负载均衡,需要对主机负载进行有效的预测,这区别于网络流量的预测。论文从分析主机负载的特性入手,依据负载动态变化的规律,提出了一种具有普遍适用性的主机负载预测方法—线性时间序列模型法,并按该方法建立了HLPS(HostLoadPredictionSystem)模型,提出了HLPS的实现策略。     

有粘结预应力梁施工中的若干问题探讨

通过某有粘结预应力梁工程实例，分析和探讨预应力工程设计和施工中的几个关键问题，并据此提出合理化建议。     

某大厦结构加固设计计算及施工

系统介绍了加固方案选择，加固量计算方法，加固设计计算及加固施工，并给出某大厦扩建工程加固设计及实践的实例。     

活塞环-缸套摩擦磨损模拟实验方法研究

提出了一种评价活塞环柛滋啄Σ聊ニ鹦阅艿目焖倌D馐笛榉椒ǎ兄屏送词侥D饽Σ聊ニ鹗笛榛睾伞⑺俣鹊仁笛椴问湍Σ亮Α⒆苣コ痰仁笛榻峁牟馐宰爸眉捌浼扑慊莶杉硐低常- 实验直接采用被测的活塞环和缸套作为试样,这不仅使模拟实验更接近实际情况而且大大减少了试样制备的工作量. 以表面涂覆Ti-TiN耐磨涂层的492 发动机活塞环及与其配副的缸套为试样进行了重复性实验,结果表明:用质量法测量的磨损量最大相对误差＜8.5%;摩擦力的最大相对误差<2%.