弄福屯危岩体发育特征及稳定性分析

百色市凌云县弄福屯危岩体发现已久，近年来多次发生零星崩塌掉块现象，严重威胁山下村民的生命财产安全。通过工程地质调查，查明了弄福屯危岩体发育区的工程地质特征，分析了危岩体形成的原因、破坏方式及主要影响因素。根据其破坏方式分别进行稳定性计算，评价危岩体的稳定性并提出治理措施。     

Experimental study on the liquid slug of cryogenic slug flow in inclined tubes

An experimental study was carried out to understand the phenomena of the boiling flow of liquid nitrogen in inclined tubes with closed bottom by using a high speed motion analyzer.The experimental tubes are 0.018 and 0.014 m inner diameter(ID) and 1.0 m in length.The range of the inclination angle is 45°-90° from the horizontal.The experimental observation on the liquid slug was carried out along the tubes.Statistical method was employed to analyze the experimental data.The experiment analyzed the influences of the inclination angle and the tube diameter on the liquid slug length and velocity.The results show the liquid slug propagation velocity increases with the decrease of inclination angle θ.For all cases,the maximum values of the mean liquid slug lengths were obtained at θ = 60°.The mean liquid slug lengths were greater for large tube at higher tube position.These conclusions provide a basis for further study liquid slug of cryogenic two-phase undeveloped slug flow.     

基于ATmega16 MCU的机车巡检装置的设计

针对机车运行系统按时巡检的工作要求,设计了一种基于ATmega16 MCU控制的机车定时巡检语音提示装置,能够显示日历时间,设置巡检时间及录入和播放提示语音,具有较高的实用价值.本机车巡检装置由ATmega16 MCU作为主控芯片,DS1302与2片ZLG7289组成实时日历时钟的数字显示电路;ISD1760与TEA2025组成语音录放及音频功放电路;通过键盘电路可以对日历时钟进行设置及录入巡检提示语音.     

內燃机车功率等级的划分

本文在分析国外内燃机车功率等级的基础上,结合国内近期和不久将来的国内运输要求,以及内燃机车制造及运用的现状,详细论述了我国貨运内燃机车、客运内燃机车和调车内燃机车的功率等级,並提出在客运内燃机车和调车内燃机车上採用液力传动的看法;另外,还简略论述了如何从现有内燃机车的基础上发展这个功率等级的具体意见。