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Through a large number of tests of grinding the cycloidal flanks with abrasive belt, the surface roughness and residual stress exist in the complex curved parts resulting from large-curvature belt-grinding are discussed. The effect of the technical parameters on surface quality is analyzed and the empiric formula is given. This is enable to provide the grinding process with correct selecting of technical parameters. 相似文献
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Merchant M Mills K Williams S Kleckley F Sims A Elsey RM Bushnell J 《Veterinary immunology and immunopathology》2006,111(3-4):315-320
Alligators were injected intraperitoneally with four different doses (10, 1.0, 0.1, and 0.01 mg/kg body weight) of a mixture of bacterial lipopolysaccharides (LPS) derived from three different types of bacteria (Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae). Injection of the alligators with the LPS mixture resulted in a dose- and time-dependent increase in total peripheral leukocytes Lymphocytes increased at days 3 and 4 post-injection, and decreased back to baseline levels at day 7 for all doses. Alligators that were not treated, and those injected with pyrogen-free saline, did not exhibit statistically significant changes in total leukocytes during the course of the study. Injection of alligators with 0.5 mg LPS/kg body weight derived from one of three bacterial species revealed that the leukocyte increases observed were not statistically different for all three types of LPS. The animals displayed the same increases in total counts and the levels of all circulating leukocyte types were not different between animals treated with a combination of LPS from all three bacterial species. 相似文献
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桑褐刺蛾(Setora postornata Hampson)属鳞翅目刺蛾科。其幼虫为害栗、柿、核桃、梨、白杨和石榴等多种植物的叶。1982年秋,在泰安市下港公社上港和黄前一带发现桑褐刺蛾幼虫自然患病死亡,野外自然感病率高达70%以上。经分离鉴定是一种核型多角体病毒感染所致。本文着重报道该株病毒的分离和形态观察结果。 相似文献
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The forces acted on a polar coordinate measuring instrument have been analysed in this paper. According to the, characteristics of friction, a friction reducing principle, which is by motion and with rolling in place of sliding, has been put forward, with the princple we can improve the frietional state effectively and make it possible to measure large presurc angle curved parts automatically with low cost. 相似文献
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大数据时代农业信息资源共享模式的研究 总被引：1，自引：0，他引：1
构随着先进的信息技术在农业领域的不断应用,农业信息的存储、挖掘、分析等方面面临着巨大的压力。本文通过对大量的非结构化、半结构化的描述型的农业信息资源进行深度挖掘,探索其隐藏在信息深处的有价值的信息,帮助农业科技人员或农民做出科学的决策,改变过去依靠经验和直觉做决策的方式,为推进农业信息化进一步发展寻求出路。 相似文献