数控加工干涉检验的新算法

提出一种干涉检验的新算法--点到曲面距离法.通过计算刀盘上刀尖轨迹圆上的任一点到理论曲面的距离来检验刀具与被加工曲面是否存在干涉且计算出干涉量的值,大大提高了计算效率.     

投影曲面的法空间及其应用

主要讨论ｎ＋ｍ维空间的ｋ维超曲面在Ｒ＾ｎ上的投影，在非退化情况下给出了投影曲面的正交直补空间，并在ｋ＝２，ｎ＝３时给出了三维空间上投影曲面实际应用的例子。     

厚冲积层矿区地表移动参数的特点及数值模拟

我国的厚冲积层区分布广泛，通过大量的观测站数据分析及大量厚冲积层矿区地表移动特性研究，系统提出了厚冲积层矿区地表移动参数、规律的特点,并给出了相应的数学计算公式。在分析地表产生在非连续 变形机理的同时，提出了地表移动与变形的力学分析法。研究成果对于厚冲积矿区“三下”压煤开采具有一定的指导意义。     

干旱区地表结构与城镇体系空间格局

地表结构通过影响人口与产业分布，进而影响城镇体系空间格局。在地表结构作用下，我国河西走廊干旱区城镇体系呈现“小市镇、多中心”的基本空间格局。     

滑模摊铺水泥砼路面控制平整度的措施

本文分析了施工操作，机械配套，砼材料，基等几个影响路面平整度的因素，并从施工实际角度出发提出相应的技术措施，以提高滑模摊铺水泥混凝土路面的施工质量。     

高速公路水泥搅拌桩加固技术的地表沉降观测试验研究

本文结合水泥搅拌桩在高速公路软基处理中应用,对选定路基断面进行了地表沉降试验观测分析。试验结果表明水泥搅拌桩对软基的加固效果明显,沉降观测试验仪器选定及方案具有可行性。     

Influence of Clothing Fabrics on Skin Microcirculation

This study investigated the effects of clothing fabric on human skin microcirculation.Once skin is covered with a clothing fabric,human sensations,namely,coolness,warmth,softness,and roughness,are aroused immediately,and the cutaneous microcirculation may be changed consequently.Since the complex relationships of the human skin,the environment,and the clothing,there is few publication focusing on the physiological responses of the skin to the fabrics.In this paper,a Laser Doppler Flowmetry(LDF)was used to t...     

Environmental embrittlement of intermetallics

The effect of alloying elements on the environmental embrittlement of L12 type intermetallics is sum marized. The results show that the ductilizing effect of boron doping in Ni3A1 is mainly to suppress the moisture-induced environmental embrittlement. The mechanism of this suppression effect is proved to lie in the fact that it severely reduces the hydrogen diffusivity along the grain boundaries. However, the boron doping in Co3Ti alloys does not have the same effect of suppressing the environmental embrittlement. The different behavior of boron doping in Ni3A1 and Co3Ti may be attributed to its different segregation behavior on the grain boundaries. Boron in Co3Ti does not segregate on the grain boundaries and cannot effectively reduce the hydrogen diffusivity along the grain boundaries. The moisture-induced envi ronmental embrittlement of Co3Ti alloy can be completely suppressed by the addition of Fe. As proved by Auger, this suppression effect is due to its obvious reduction of the surface kinetic reaction with water vapor.     

混合磷酸酯的表面活性

用表面张力法研究了混合磷酸酯的表面活性，得出各混合体系的临界胶束浓度和临界胶束浓度时的表面张力．结果表明，ＭＡＰＤＡＰ为７０３０时混合体系表面活性最优；ＡＰ、ＰＥ含量低于３％时有利于混合体系表面活性的提高；ｐＨ值在５．５～８．５范围内，对体系的表面活性影响较小