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.     

6105Q车用柴油机连杆组合件应力计算

在毛主席的无产阶级教育路线指引下,我们冲破了旧数学专业脱离实际,关门搞“纯数学”的框框,走出高楼深院,来到三大革命运动的第一线。在上海工农动力机厂工人师傅和革命技术人员的帮助下,进行了6105Q 车用柴油机第三轮设计中连杆组合件强度和刚度的计算和分析。在“教育必须为无产阶级政治服务,必须同生产劳动相结合”的金光大道上迈出了可喜的一步。     

急需采取对策防止石棉污染

众所周知,石棉能制成优良的耐热、隔音材料,但近年来,发现其广泛污染大气,引起肺癌等肺部疾患,如果不及早采取对策,数十年后必将对人类产生更大的危害,但如何控制这难对付的物质也是一个难题。神奇矿物定时炸弹人们很早以前就把深埋在地壳中的各种各样矿物进行提炼、加工成有用的物质,像青铜器时代的铜及锡,现代社会的铁与铝等。一般将有用的矿物称为矿石,石棉也是一种矿石。石棉是一种极细的纤维状矿石,如果把成束的纤     

宇宙产生的新分子

在实验室生成的非常复杂的化合物,其中一些相继在宇宙中发现。这些分子在宇宙的什么地方?是怎样产生的呢?根据星际分子生成反应的条件,在实验室用光谱学的方法能得到这种分子。因此,天文和化学的对话正式开始了。     

流动资金贷款规模的优化研究

对金融调控在计划与市场两种体制下的调控机制与调控手段进行了比较分析，建立了金融调控模型．研究了银行流动资金贷款的存在性，给出了最适规模的优化求解方法和近几年的实际测算结果。     

可微函数鞍点识别的条件

列举了Ｗｉｓｍｅｒ等人所给的鞍点识别充分条件的反例，并给出了正确的鞍点识别条件。     

具阻尼的Lienard型微分方程的有界性定理

The Liénard equation(1)x″+f(x)x′,+g(x)=e(t)is one of the most important differential equations in thetheory of ordinary differential equations,and there havebeen extensive works on the boundedness of solutions andon the existence of periodic solutions(when e(t) is constantor periadic).The study has continued up to date,and paperson the topics appear even in recent journals.One of main ideas to prove the boundedness of the soluti-