RAZUMIKHIN-TYPE THEOREMS OF NEUTRAL STOCHASTIC FUNCTIONAL DIFFERENTIAL EQUATIONS

The stability of stochastic functional differential equation with Markovian switching was studied by several authors,but there was almost no work on the stability of the neutral stochastic functional differential equations with Markovian switching.The aim of this article is to close this gap.The authors establish Razumikhin-type theorem of the neutral stochastic functional differential equations with Markovian switching,and those without Markovian switching.     

The improved neutral network and its application for valuing rock mass mechanical parameter

The artificial neutral network（ANN） has the ability that self-study and self-remember, its 3 layers BP network has been applied extensively, but sometimes because of serious multi-correlation between the variables, and a few observations while many variables, there usually will result into paralyzing in study, and the neutral network further development is restricted in the system to some extent. The partial least square regression（PLS） has its advantage of building the calculation model between the variables with strong multi-correlation, especially much effective on a few data and many variables. So a new and effective method-improved neutral network has been introduced-the neutral network based on the PLS. The results of example show the improved method has a few calculations and high accuracy, and provide a new way for valuing the rock mass mechanical parameters.     

采用注入法对配电网中性点进行测量

针对配电网中不对称度大的中性点接地方式,提出了采用异频信号注入法对其进行测量,重点分析了其原理并进行详细地理论推导,最后模拟10 kV配电网进行了实验测试.该方法使配电网的谐振频率远离工频50 Hz,有效降低了不对称度大的配电网的位移电压,测量简单,安全可靠.实验结果表明其具有测量精度高、实时性好等特点,具有广阔的应用前景.     

NGC2发电机局部放电在线监测系统设计与应用

本文结合大型水电厂发电机局部放电在线监测的需要,研发了一套基于中性点耦合法的大型发电机局部放电在线监测系统,采用功能强大的计算机主流技术,与高性能模块化硬件结合而成,通过现场实测,验证了该系统的有效性。     

SiO2 gate insulator defects,spatial distributions,densities, types,and sizes

Standard IC processes, as well as those involving the use of ionizing radiation, such as x-ray lithography etc., result in the generation of bulk defects, and interface states in the gate insulator, or underlying substrate, respectively, of insulated gate field effect transistors. Bulk defects are believed to be present as positively and negatively charged electron and hole traps, respectively, as well as neutral hole and “large” and “small” neutral electron traps. This paper provides a perspective of the current state of knowledge about the spatial distributions of large bulk defects, their areal densities, sizes, possible interrelationships among them, and the special cases of defects created by ion implanted silicon and oxygen, where knock-on effects have been simulated. It appears that bulk defects may all have their origin in neutral hole traps, (so-called E′ centers) and that when the insulator thickness is decreased to about 6-7 nm, defects are either no longer present, or, more likely, are incapable of trapping charge at room temperature because trapped carriers can either tunnel to one of the interfaces, or be annihilated by a reverse process. It appears possible also that the precursor of the several types of defects only forms at a “grown” silicon-silicon oxide interface. In theory, this would make it possible to grow defect free insulators by a combination of deposition and oxidation processes.     

基于ART-2网络的自行火炮变速箱状态自适应分类

对于结构复杂的自行火炮变速箱，其故障模式具有不可预知性。针对传统的神经网络识别方法明显存在不足这一问题，提出一种基于自适应谐振理论（Adaptive Resonance Theory）的自行火炮变速箱瞬态过程故障诊断新方法。该方法不仅可以对已知的故障模式进行分类，而且对自行火炮变速箱未知故障模式具有很强的自适应分辨能力。实例证明，ART-2神经网络与传统的神经网络方法相结合为自行火炮变速箱故障诊断提出了新思路。     

10kV配电变压器中性点带电的危害及防范对策

近年来,我国因10kV配电变压器中性点带电所引发的变压器台架或者本体带电等危害频发出现,有必须要对其危害类型及其预防策略进行探究,以期借助研究来找到防范其带电危害的切实可行策略。     

中性线的转换对UPS性能的影响和对策

由于低压配电系统接地故障保护（GFP）的需要,市电与备用发电机组电源转换电路必须采用4极自动转换开关（ATS）,而有些4极ATS在转换过程中存在中性线中断现象,严重影响了UPS的正常运行,由此引发的UPS故障和负载停电事件越来越受到关注。文中分析电信和数据中心常用市电和备用发电机组电源转换电路的性能及其对GFP和UPS运行的影响,提出工程实用解决方案。     

PSOM算法用于未知雷达信号分选

粒子群算法(PSO)和神经网络的有机结合是目前一个十分活跃的研究领域,为分类问题的研究提供了新的思路和方法。针对基本SOM算法聚类数目不确定、聚类效果不佳等问题,提出PSOM算法用于未知雷达信号分选,利用PSO的优化算法替代SOM的启发式训练,对基本SOM算法进行改进,最后通过仿真实验验证了该算法在未知雷达信号分选应用上的有效性。     

不浸酸无铬鞣剂TWT的环保性能研究

考察了无铬鞣剂TWT的环保性能。研究结果表明,无铬鞣剂TWT属于低毒、可生物降解性物质,对家兔眼睛和皮肤均无刺激性,对豚鼠皮肤致敏性较弱。基于TWT的不浸酸鞣制工艺明显减轻了中性盐对环境的污染。TWT鞣制的白湿皮毒性较低（LD50〉5000 mg/kg）,片皮、削匀所产生的废皮屑可回收利用。与常规植鞣法相比,半植鞣法可节约栲胶50%左右,且废液中的栲胶含量较低。在铬复鞣逆转工艺中,当铬粉用量为削匀革5%时,皮坯收缩温度可达到110℃,与常规铬鞣法相当,但铬粉用量可节约50%以上,废液中的三氧化二铬含量也仅为240 mg/L。铬复鞣逆转工艺不产生含铬固体废弃物,仅最后一道工序产生低铬废水。以上研究结果表明,无铬鞣剂TWT环保性能优良。