碳纳米管及其批量制备研究进展

从碳纳米管的优异性能和应用出发,综述了碳纳米管的制备方法以及我国目前在碳纳米管研究中面临的问题;分析了碳纳米管产业化对的我国纳米技术产业化发展的积极意义,特别介绍了清华-南风纳米粉体产业化工程中心开发的、具有我国自主知识产权的纳米聚团流态化技术。     

稠油出砂冷采过程中储层孔隙度预测模型

从岩石力学原理出发，结合稠油出砂冷采过程中的动态特征，研究了等温条件下疏松砂岩体积应变率随累积产油量和累积出砂量的变化规律，建立了出砂冷采过程中储层孔隙度的预测模型。该模型可以定量预测稠油出砂冷采过程中储层孔隙度的变化规律，从而为出砂冷采过程中其他规律的研究奠定了基础。     

炼钢中间包塞棒液压伺服比例控制系统的应用

济钢第三炼钢厂中间包塞棒液压伺服比例控制系统采用伺服比例阀和伺服缸等,系统设计完善,功能齐全,可实现塞棒位置的闭环控制,保证了结晶器中钢水液面的稳定。     

An alternative method to compute the component fractions in the geometrical optical model: visual computing method

A method called visual computing was used to solve angular four-components' proportions and directional vegetation cover fraction for discrete canopies and continuous row-planted plants. It proved effective to predict the angular characteristics on pixel scale. The method could be an alternative way to a classical solution of geometrical optical models. A visual computing method would be effective especially when the canopies' spatial distribution and shapes were irregular and could not be described statistically.     

A broadband PHEMT MMIC distributed doubler using high-pass drain line topology

A broadband frequency doubler, based on distributed amplifier techniques, has been designed to operate from 11 to 21 GHz. In order to reject the fundamental signal over a broadband frequency range, the conventional low-pass drain line structure was replaced with the high-pass structure. This topology can suppress fundamental signals over broadband without any balanced structure so that the chip size can be more compact. Measured conversion losses of better than 10 dB from 11 to 21 GHz input frequencies are achieved with fundamental signal rejection better than 12 dB. To the best of our knowledge, this is the first demonstration of distributed doubler using the high-pass drain line topology.     

Cu－MnO_2同槽电解半工业试验研究

提出了Ｃｕ－ＭｎＯ＿２同槽电解的新工艺，在同一电解槽同时得到电铜和电解二氧化锰两种产品，该新工艺具有低电耗、低酸雾污染和低酸耗等优点．     

半导体激光器用铷D2线光电流谱稳频

本文报导了用铷原子７８００Ａ光电流谱来稳定半导体激光器的工作，在光电流谱线的中部发现了有利于稳频的凹陷，将半导体激光器频率锁定在凹陷的中央，估算的频率稳定度为１ＭＨｚ。