液晶感应式电缆测断仪的研制成果报告

价廉易用的电缆测断仪市场不易购到。本文的电缆测断仪，采用了电子手表上的液晶显示屏显示，此技术取得了良好的效果。

Study on Shock Wave and Turbulent Boundary Layer Interactions in a Square Duct at Mach 2 and 4

In this paper, the outline of the Mach 4 supersonic wind tunnel for the investigation of the supersonic internal flows in ducts was firstly described. Secondly, the location, structure and characteristics of the Mach 2 and Mach 4 pseudo-shock waves in a square duct were investigated by color schlieren photographs and duct wall pressure fluctuation measurements. Finally, the wall shear stress distributions on the side, top and bottom walls of the square duct with the Mach 4 pseudo-shock wave were investigated qualitatively by the shear stress-sensitive liquid crystal visualization method. The side wall boundary layer separation region under the first shock is narrow near the top wall, while the side wall boundary layer separation region under the first shock is very wide near the bottom wall.

少数人的选择——平板电脑用户调查实录

“有报天天读,新闻点点评,我是杨锦麟”,相信收看凤凰卫视的人都知道,这是“有报天天读”栏目的开场白。凭借主持人幽默犀利的语言和抑扬顿挫的语调,这个栏目在开播后不到2个月的时间就迅速窜红,很多人都养成了“在电视里看报纸新闻”的习惯。杨锦麟读报还有个特点,那就是“读报”时手中总握着一只笔,不时地在一台“电脑屏幕”上点点画画,在主持人旁边出现的窗口上不但有放大了的报纸原文,而且主持人的一笔一划也显现了出来。相信不少观众都会感到十分新奇:他怎么可以在电脑屏幕上随意的写写画画?这到底是一台什么电脑呢?其实,主持人所使用的是对很多人还比较陌生的新产品,同时也是本文的主角——平板电脑。