微波辐射KF—Al_2O_3催化合成查尔酮的研究

Reported in this paper is the synthesis of Chalcone by microwave irradiation and using KF-Al 2O 3 catalyst.As compared with conventional method,the reaction time was reduced considerably yet the yidld was good.

铁煤集团宽带接入方式及其应用

本文介绍了几种最新宽带接入方式,并结合铁煤集团矿区特点阐述了适合矿区使用的宽带接入方式及矿区宽带的应用情况。