少林武术起源五种“创拳说”评述

在系统、全面、客观地分析诸多"起源说"的基础上,认为少林武术起源是以"禅武结合"第一人僧稠入少林寺时间为界限的,即北魏宣武帝延昌年间。同时,少林武术是在军事实践与汲取民间武术精华基础上发展起来的,是武僧集体智慧结晶的产物

金属材料小滑差率滚动接触疲劳加速试验方法

本发明公开一种金属材料小滑差率滚动接触疲劳加速试验方法，其包括如下步骤：（1）选择硬度不低于被测金属材料的陪试材料，将被测金属材料和陪试材料加工成彼此具有滚动接触圆柱面的被测试样和陪试样；（2）使被测试样和陪试样进行滚动接触，在不大于2%的滑差率下，进行固定摩擦系数的无润滑磨损试验，使被测试样表面产生剪切短裂纹；（3）在被测试样和陪试样间加入液体润滑剂，并在与无润滑磨损试验相同的滑差率条件下，接着进行液体润滑接触疲劳试验；（4）观察被测试样表面，并在被测试样失效时停止试验。应用本发明可在实验室模拟小滑差率滚动接触疲劳工况，如轮轨接触，及对改进工艺的产品或材料的接触疲劳寿命对比试验

Evaluation of soil erodibility on the Loess Plateau

通过回顾已有的成果 ,分析评价了我国土壤可蚀性研究的进展及存在的问题 ,提出我国土壤可蚀性研究中的标准小区定义。运用野外观测资料 ,研究计算了黄土高原地区土壤可蚀性指标值。结果表明 ,陕北和晋西北一带黄土可蚀性 K值变化于 0 .3～ 0 .7之间 ,并且有以陕西子洲、绥德一带为最大 ,以此为中心 ,向南、向北和向东都减少的变化趋势

Effect of laser dispersed treated morphology on traction coefficient under mixed lubrication

To investigate the influence of surface texture on traction characteristics of wheel/rail under mixed lubrication, laser dispersed treatment was used to form texture patterns, such as longitudinal, transverse and rhombus, on the surface of wheel discs. The film thickness and contact area ratio were calculated by using deterministic model instead of stochastic model. Based on the load-sharing concept, the hydrodynamic film and asperities both contribute in carrying the total load. Therefore the traction force is composed of two components: hydrodynamic traction force and asperity traction force. The tribological tests were conducted on an Amsler type wear testing machine. It is shown that the traction coefficient of rhombus pattern is higher than that of longitudinal and transverse, while the latters are similar. Though the asperity orientation of longitudinal and transverse is different, their influence on traction coefficient under mixed lubrication should be investigated further. © Civil-Comp Press, 2014