中条山供水工程取水首部电气设计的特点

对70m落差下大型泵站供电设计中电缆的受发热这两个难点进行了论述，并通过应用特种电缆和工程塑料解决了这些难题，使泵站的设计能够较好地满足安全、便利运行的要求，为地质条件较为复杂的情况下设计泵站提供了一个比较理想的模式。     

共轭梯度法在三维复杂流动数值分析中的应用

将多块网格技术运用于三维T型管复杂流场的网格生成，利用不完全乔列斯基预处理共轭梯度，双共轭梯度方法求解N－S方程的离散方程。计算表明上述方法有良好的收敛特性，适合于诸如T型管等复杂流动的分析。     

2007年国外有机硅进展

根据2007年公开发表的相关资料,综述了2007年国外有机硅行业的市场动向、行业动向及有机硅产品的研发进展.     

软交换技术的发展及其应用

软交换是下一代网络NGN的核心技术，本文从软交换的概念入手，介绍了软交换的基本功能及其优点．软交换的网络系统结构、软交换的对外接口等内容，并探讨了软交换技术的应用。     

建材研究的新热点——黄河淤泥沙综合利用进展及前景展望

简要介绍了黄河淤泥沙的特性及相关情况,论述了黄河於泥综合利用研究的进展及主要成果,概述了其工业化开发的现状,分析了其存在的问题,对其发展前景进行了预测。黄河淤泥沙综合利用工作是关系到国计民生、千秋万代的大事,具有重要的现实意义和深远的历史意义。     

一种3V CMOS音乐集成电路的设计原理

介绍了一种数字式全定制音乐集成电路设计原理。对伪音阶发生器、节拍发生器等子电路作了较详细的叙述。采用这种原理可设计出单芯片驱动压电陶瓷和发光二极管的音乐集成电路，该电路无须外接电阻、电容，可存储数首歌曲；另外，还可设计出一种数字音频程控频率合成器，时钟为ｆ０时，可控频率范围为ｆ０２～ｆ０２Ｎ。     

温州城市河道生态调水控制性工程设置与效果分析

生态调水可以减轻河道水污染,通过对几年来生态调水问题的研究,提出相应的对策。为改善调水效果、节约水量,在内河增设控制闸坝,并对其调水效果进行计算分析。结果表明新增闸坝对部分调水效果有一定程度改善,并能节约一定水量。     

1999年长江洪水及几点认识

Following the basin wide heavy flood on Changjiang River in 1998, a si gnificant flood occurred in 1999. Comparative analysis of both floods in terms of flows and flooding situations shows that both floods had one common feature, that is, the flood stages were fairly high. But they differed greatly at the sa me time, that is, the 1998 flood was a basin wide heavy one while the 1999 flood was a significant local one. At Yichang station there occurred eight flood pea ks in 1998, while in 1999 only three peaks took place. The maximum peak dischar ge at this station in 1999 was 57 600 cubic meters per second, which was smaller than that in 1998. The maximum flood-volume in 30 d of the 1998 flood at this s t ation equaled that in 1954, when an extraordinary heavy flood happened on the River, while the maximum flood-volume in 30 d in 1999 was 25.8 billion cubic me t ers per second smaller than the 1998 one. It is seen that inflow floods from th e upstream Changjiang River (above Yichang) in 1999 were not so big. Comparison of flood volumes in longer period shows that the 1999 flood was relatively conc entrated while the 1998 one had lasted longer duration. Analysis shows that flo oding situations in both years differed significantly in terms of the flood volu mes diverted from river channels due to dyke breaches and collapses, the cases o f polder embankment collapses, the areas of inundated cultivated land and the nu mbers of dangerous events for hydraulic structures. These differences had been resulted from the different properties of both floods and the dyke strengthening efforts made after the 1998 flood. It is seen that flood control engineering c onstructions initiated in the days following the 1998 flood have played an impor tant role in fighting the 1999 flood.     

L-带掺铒光纤放大器的研究与进展

通过理论计算，比较了C－带掺铒光纤放大器和L－带掺铒光纤放大器的增益特性，并较为全面地阐述了近几年来国内外对L－带掺铒光纤放大器的研究情况。通过对L－带掺铒光纤放大器工作原理的分析，总结出新的设计思路与方案，提出了一些新的研究点。