关于开办高职"铁道机车车辆"专业的调查与分析

本文介绍了高职“铁道机车车辆”专业在华南地区的市场调查情况，并就调查结果对该专业在华南地区的发展前景．人才需求、办学方向、专业基础和能力要求进行了分析，并结合调查意见，提出了该专业的办学意见。     

Grinding Characteristics Of Directionally Aligned SiC Whisker Wheel-Comparison With Al2O3 Fiber Wheel

A unique SiC whisker wheel was invented,in which the whiskers were aligned normally to the grinding wheel surface.In this paper,grindabilities of the SiC whisker wheel are investigated and compared with those of other wheels of SiC grains,Al2O3 grains,as well as Al2O3 long and short fibres which were also aligned normally to the grinding wheel surface,respectively.The main research contents concern grinding characteristics of a directionally aligned SiC whisker wheel such as material-removal volume,wheel-wear rates,integrity of the ground surfaces,grinding ratios and grinding efficiency.Furthermore,grinding wheels of whiskers and fibres have a common disadvantage:they tend to load easily.The authors have proposed a simple method of loading-free grinding to overcome this propensity and investigate some related grinding characteristics under loading-free grinding conditions.     

道路人工清扫扬尘中PM10污染影响因素研究

目的确定影响道路人工清扫过程扬尘大小的因素之间关系及排放因子量化模型。方法采用模拟实验方法，通过改变路面粉尘负荷q清扫强度Q以及路面粉尘湿度F等条件，对影响道路清扫过程PM10发生的主要影响因素展开研究。结果提出了中国北方城市道路人工清扫过程扬尘中PM10浓度的量化计算模型。结论粉尘含湿量对道路人工清扫扬尘量的影响最大，粉尘负荷次之，清扫强度最小。     

Compressive Behaviours of Concrete Cylinders Wrapped with 2- D Glass Fabrics

Concrete cylinders wrapped with glass fabrics of various constructions were fabricated. Compressive behaviours of cylinders with and without fabric wrapping were investigated. Comparisons of the compressive characters while using different fabrication parameters were made. It was demonstrated that the effect of the fabric reinforcement was obvious. The tensile strength of the filament used in the fabric played an important role as far as the anti-compression behaviour of the reinforced cylinders is concerned.     

月旦诗话(二则)

于谦与岳飞明代的民族英雄于谦以其“粉身碎骨都不怕,要留清白在人间”(《石灰》)的壮怀抵抗蒙古族瓦刺部的侵略,与南宋的岳飞齐名,赢得古今多少人的赞叹,明英宗被俘于怀来土木堡,宋徽、钦二宗被俘于汴京,两个皇朝都是在最高统治者突然陷入敌手的情况下,拥立新君,由爱国的敢于担起救亡重任的人物保卫祖国,而两个皇朝的抗敌派代表人物部不幸被     

微处理机DDC调节的可控硅双闭环直流调速系统

本文探讨用TP801单板机组成的直接数字控制(DDG)直流调速系统的实现方法,采用了以单板机软件代替模拟系统的速度调节器(ST)和模拟电流调节器(LT).给出了电流环,速度环的PI程序框图接口及主程序框图,程序设计思想,硬件设计,通过调试实验而说明完全可行.