frontal resistance

In order to resolve the safty problem of windward wall spaUing off in deeper and deeper shaft driving soft rock roadway,the theory methods about mechanics of rock mass and materials mechanics and geologic mechanics are used to study its mechanism of spalling off and its optimial rockbolt arrangement scheme.

为了解决采深不断加大的软岩巷道掘进迎头片帮安全问题,运用岩体力学、材料力学、地质学理论方法研究了软岩巷道掘进迎头片帮机理和巷道掘进迎面墙锚杆布置优化方案。

Relationship of tube row number and face velocity in an evaporator for air conditioning unit and its application;

空调装置蒸发器管排数与迎面风速关系探析及应用

The influence of face velocity,condensing temperature and contact thermo-resistance on the quantity of heat-exchanger and the influence of air resistance on face velocity were analyzed.

介绍了一种自控程度好、控制精度高的空调换热器综合实验台的研制过程,其中包括实验台各组成部分的功能以及各参数的设计范围;对不同涨头尺寸的冷凝器的性能进行了实验研究,并根据实验结果分析了迎面风速对换热量的影响、迎面风速对空气侧阻力的影响、冷凝温度对换热量的影响以及接触热阻对换热量的影响。

In order to study the convection limits of surface fires and interactions between backfires and main fires,several experiments are conducted in a large space indoor laboratory: in which the effects of ambient wind speeds and changing temperatures can be avoided.

为了研究地表火卷吸作用的范围和迎面火与主火相互作用的机理 ,在大空间室内实验室进行了实验研究 。