排序方式: 共有4条查询结果,搜索用时 15 毫秒
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陈晓光 《四川职业技术学院学报》2005,15(4):96-97
人的体液保持着一定的H+浓度,即保持着一定的pH值,才能维持正常的生理和代谢功能.由于人体在代谢过程中会产生一定量的酸性物质或碱性物质,使体液中H+浓度经常发生波动,但血液的pH值会在狭窄的7.35-7.45范围内变动,主要是人体能经过体液的缓冲系统,肺的呼吸和肾的调节等来平衡酸碱度. 相似文献
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卢义玉 《重庆大学学报(英文版)》2002,1(1):11-15
A new type jet, the oscillating & deflecting jet, is put forward and its oscillating and deflecting characteristics are investigated. The nozzle of the self-oscillating & deflecting water jet consists of an upstream nozzle, a downstream nozzle, an oscillating chamber and two switches. It is experimentally shown that the deflective angle may reach 9.53 degree. The generated pressure fluctuation is very regular and the jet can efficiently increase the ability for breaking and cutting by eliminating the water cushion effect associated with a continuous jet. 相似文献
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王峰 《洛阳工业高等专科学校学报》2001,11(3):31-32
气垫垛板是横剪的最后一道工序,只有选择合适的风压才能满足垛板的工艺要求。本文针对气垫垛板台风机原有的挡板节流控制方式的缺陷,采用变频器对其进行改进。相关数据的测试和对比结果表明,变频器用于气垫垛板台鼓风机控制,既满足了生产工艺要求又具有显著的经济效益,是一种理想的控制方法。 相似文献
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