轴承套圈挤压凸模失效分析及改进措施

针对目前大多轴承厂家的套圈的冷挤压过程中,凸模头部损坏非常突出的情况,对各工艺作出具体的分析,并提出解决措施.     

Performances of the cotton bollworm,Heliothis armigera (Hubner) at different temperatures and relative humidities

The cotton bollworm, Heliothis armigera (Hubner) is an important insect species at-tacking many crops. Their performances have been examined at temperatures from 15℃ to 35℃ and relative humidities (RH) between 22.5% and 100%, respectively, in order to assess possible effect of climate in future on its occurrence and infestation. Durations of all developmental stages of the insect shortened with increasing temperature. The temperature favoring population growth ranged from 25℃ to 30℃.Larval duration and adult longevity decreased as relative humidity increased, but development of other stages was independent of RH. At RH of over 64%, their survival rate, egg production and oviposition rate varied a little, and all the population parameters of the insect remained at a relative constant level.     

Analysis of styrene oxide-hemoglobin adducts at different binding sites

Ａｎａｌｙｓｉｓｏｆｓｔｙｒｅｎｅｏｘｉｄｅ－ｈｅｍｏｇｌｏｂｉｎａｄｄｕｃｔｓａｔｄｉｆｅｒｅｎｔｂｉｎｄｉｎｇｓｉｔｅｓＪｉｎＺｕｌｉａｎｇ，ＬｉｕＳｈｕｆｅｎＴｈｅＲｅｓｅａｒｃｈＣｅｎｔｒｅｆｏｒＥｃｏＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎ...     

旋转拉伸弯管法

弯管工艺是指将平直的管子按选定的半径和弯曲角度弯曲成形。管子冷弯的方法有好几种,此文讲述的是旋转拉伸弯管法。文章主要介绍旋转拉伸弯管法的原理,所用的基本工具及其功能,弯管的操作步骤等等。对如何生产合格的冷弯管子有一定的参考作用。     

静液挤压技术的研究现状

此文简述了静液挤压工艺的发展过程、工作原理、工艺特性,并初步探讨了该工艺对材料组织与性能的影响.     

Anaerobic digestion for waste water poultry manure by UBF reactor

ＡｎａｅｒｏｂｉｃｄｉｇｅｓｔｉｏｎｆｏｒｗａｓｔｅｗａｔｅｒｐｏｕｌｔｒｙｍａｎｕｒｅｂｙＵＢＦｒｅａｃｔｏｒＧｈａｎｅｍＩ．Ｉ．ＩｂｒａｈｉｍＡｇｒｉｃｕｌｔｕｒａｌＥｎｇｉｎｅｅｒｉｎｇＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ａｇｒｉｃｕｌｔｕｒ...     

Microorganisms desulfurization of coal

A culture of Thiobacillus ferrooxidans strain T-4, isolated from Song Zao Coal Mining, China, is able to use pyrite from coal as a source of energy. The bacterial culture solution with 108 -109 cells/ml, pH 1.55 - 1.70 was employed in the nine coal samples with -200 mesh have been studied at initial pH 1.7.30℃ , 20-30% coal pulp density. The bacterial removal sulfur from coal in samples 3, 4, 6 and 7 were reduced to 1.05 - 1.33% and 86.11% of pyritic sulfur can be removed in 4-24 hours.     

轴对称体扭压成形过程的热力耦合有限元分析

扭压成形工艺和一般镦粗相比有许多优点.考虑到成形过程中温度与变形间的热力耦合效应,运用刚粘塑性有限元方法,详细分析了高温下轴对称体的扭压成形过程中的变形规律.结果表明:扭压成形能促使变形均匀,增加变形量;成形温度、摩擦和变形速度对整个变形过程产生较大的影响.     

浅谈化验室采样过程中的HSE管理

简要分析化验室采样过程中存在的问题，并就如何对石化化验室采样过程实行HSE管理提出一些具体的管理办法。     

板材电磁成形实验研究

此文对板材电磁成形进行了较全面的实验研究,并对板材在成形过程中变形规律进行了分析,同时对成形效率进行了讨论,为电磁成形技术的推广应用奠定了基础。