苯乙酮制备实验的探讨与改进

对高师有机化学实验教材中苯乙酮的制备实验进行了探讨与改进,使用升华无水 ＡｌＣｌ３作催化剂,在ＡｌＣｌ３／Ａｃ２Ｏ摩尔比为２．３～２．５时取得了较好的实验结果。制备收率由原来５６％提高到７０％。     

Fuzzy control of electro-mechanical gearbox actuator

In this paper, a prototype direct-drive electro-mechanical actuator is proposed to select gears in a high performance gearbox. Because of the nonlinear behavior of the actuator, a fuzzy logic controller is adopted. The result of simulation has proved that the dynamic response obtained using the fuzzy controller is much faster than that obtained using traditional PD controller.     

二硼烷分子的键能和成键特性研究

用从头算方法对二硼烷分子的键能进行了量子化学计算,对其成键特性进行了讨论,计算结果表明,B—B间有一弱键生成。     

大环内酯合成方法和反应历程

本文介绍了大环内酯的合成方法和典型反应历程。     

Position control of direct-drive permanent magnet linear actuators

The paper illustrates the typical variations of the direct-drive permanent magnet linear actuators and introduces two types of position control; a PI controller and a fuzzy controller. They respectively have their own advantages and disadvantages. The experiment have shown that the PI controller has better repeatability, while the fuzzy logic controller has smaller cumulative position square-error which can lead to a high positional accuracy.     

新试剂1-(4-硝基苯)-3-(5-硝基-2-吡啶基)-三氮唏的合成及其与镉的显色反应(英)

报道新试剂１－（４－硝基苯）－３－（５－硝基－２－吡啶基）－三氮烯的合成及与镉的显色反应,结果表明：在Ｔｒｉｔｏｎｘ－１００存在下,ｐＨ＝１０． ３１－１１． ５０时,试剂与镉形成 １：２型的黄色络合物,应用双波长法其表观摩尔吸光奇数 ε＝２ ４８×１０５Ｌ· ｍｏｌ－１·ｃｍ－１,试值范围为 ０～８μｇＣｄ（Ⅱ）／２５ｍｏｌ