机用传动带尼龙片基材质性能初探

对上海、常州、无锡等地的新型传动带使用厂家进行了调研。对进口和国产的传动带作了静拉伸试验,观察了载荷与形变的关系;测定了尼龙片基的吸水率,红外光谱,分子量,熔体指数,结晶度等。据此,分析了进口与国产带之间的差距,指出提高产品质量的途径。     

联合使用碱和氧化剂分离毒砂与黄铁矿

本文提出了碱和氧化剂联合使用的方法分离毒砂与黄铁矿,并对其作用机理进行了研究。结果表明,氧化剂氧化后的硫化矿物,表面特性及可浮性发生了很大的变化,在碳酸钠作用下,可以实现毒砂和黄铁矿的分离。这主要是由于氧化剂选择性氧化抑制毒砂的同时,碱选择性地阻碍捕收剂在毒砂表面的吸附,并清洗黄铁矿表面因氧化而生成的不利于浮选的氧化产物。在该条件下,矿物表面的氧化产物和无碱时相同。     

Biodegradation of Absorbable Hydroxyapatite／Poly—DL—lactide COmposites in Different Environment

To develop a new generation of absorbable fracture fixation devices with enhanced biocompatibility,the biodegradation mechanism and its influence on the cellular response at the tissue/implant interfoce of hydroxyapatite/poly-DL-lactide(HA/PDLLA) composites were investigated in vitro and in vivo.HA/PDLLA rods were immersed in phosphate-buffered saline,or implanted in muscle and bony tissue for 52 weeks.Scanning electron microscopic and histological studies were done.The degradation rate was the slowest in vitro,slower in muscle tissue and fast in bone.In vitro,the composites degraded heterogeneously and a hollow structure was formed.In bone,the limited clearing capacity leads to the accumulation of oligomeric debris,which contribute totally to the autocatalytic effect.So,the fastest degradation and intense tissue response were seen.In muscle tissue,oligomeric debris migratred into vicinal fibers over a long distance from the original implant cavity and the tissue reactions were,however,quite moderate.For the same size organic/inorganic composite,the environment where it was placed is the major factor in determining its biodegradation process and cellular reaction.In living tissue,tactors such as cells,enzymes and mechanical stress have an obvious influentce on the biodegradation and biological process at the tissue/implant interface,The biocompatibility of the HA/PDLLA composistes is enhanced with the incorporating of the resorbable HA microparticles.     

Developing Refractories for Exporting

The total output of China refractory products and export volume of China refractory raw materials rank the first in the world,In future the task is to improve the quality of the products to enlarge the variety and to expand export.     

China Metallurgical and Refractory Industries

A survey of the state and development of metallurgy and refractory materials industries in the People‘s Republic of China (PRC)is given ,kinds of refractory materials and range of final products made of them are described.     

SPR系统加速Fab范围内成品率提升

缺陷图样识别（SPR）技术可以加速对良率损失问题的矫正。其面临的最大挑战在于如何配置SPR系统才能高效地处理现代fab所产生的海量数据，并对数据加以组织以提供快速一致的解决方案。     

人工神经网络及其光学实现

用高技术实现具有大脑的某些信息处理功能的人工神经网络的研究热潮,正在世界范围内形成。本文综述这一研究领域的历史背景和最新进展,着重于用光学方法实现神经网络的国内外研究状况和发展趋势。     

四级锚链钢热处理工艺参数的优选

通过正交试验,优选了国产新型四级锚链试验钢的热处理工艺参数。试验结果表明,当试验钢在950℃淬火并600℃或640℃回火时,可获得良好的强韧性而能满足四级锚链钢的力学性能要求。因此,选择合适的调质工艺是提高低合金高强度锚链钢强韧性的一条有效途径。