基于复模型的模拟电路故障诊断

参数故障诊断和容差问题是模拟电路故障诊断的两个主要难题。该文从故障建模入手,提出一种新的复数域参数故障统一建模方法。模拟电路输出电压的实部和虚部都是故障元件参数的函数,联立实部和虚部函数,并消掉被建模元件参数,得到与参数无关的函数。该函数只由电路结构、故障元件位置和无故障元件的参数确定。因此,以它作为故障模型就与参数无关,能描述任何参数漂移、开路和短路故障。该模型函数是二次函数,除了无故障点之外,不同元件的模型函数会在复平面上相交于第二个点,称为混叠问题。该文采用多频方法来消除此混叠现象。仿真结果验证了方法的有效性。

Temporal and Spatial Distribution and Influence Systems of Spring Thunderstorms in 2013 in Sichuan Province

Based on the lightning monitoring data, automatic and routine weather station observation data in spring （March-May） of 2013 of Sichuan Province, the corresponding relationship between the spatial distribution and the different regions, and the characteristics of atmospheric circulation and evolution of influence the sys- tem were analyzed and summarized. The results show that： the lightning and thunderstorm showed great regional differences in the spring of 2013 in Sichuan Province and the thunderstorm activity period was not the same in different areas. Because of the change of atmospheric circulation, the influence system from March to May corresponding to the thunderstorms in Sichuan tended to be volatile, also.

泰国天然气与石油的开发

本世纪六十年代,泰国工业化开始起步,能源需求日益增加,石油在国家工业化中的地位也就显得十分重要了。对基本上不产石油的泰国来说,石油问题给泰国政府曾造成不小的压力,特别是七十年代两次石油危机的冲击,对泰国经济影响很大。如何减少对进口石油的依赖,开发本国能源和发展替代能源已成为泰国政府认真研究的课题。近年来,泰国在开发和利用本国能源方面已取得了一些成绩,促进了泰国经济的发展。