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正An academician of Chinese Academy of Sciences (CAS),Professor Changxuan Yu,a long-time professor of plasma physics at the University of Science and Technology of China (USTC),Hefei,China,passed away in Hefei on May 23,2017.Professor Yu was born on July 7,1941,in Java Island,Indonesia,and then moved back to China in 1948 with his parents.He finished his high school 相似文献
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现代科技发展中的防微振技术 总被引:2,自引:0,他引:2
现代科学技术的发展给防微振技术提出了更高的要求,它已成为一项前沿学科。本文在对防微振技术重要性分析的基础上,对精密设备、仪器微振动控制值确定原理及方法进行深入分析,在此基础上,提出了防微振的主要措施,并给出了工程应用实例,最后展望了防微振技术发展的方向。 相似文献
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根据现有规范中的振动衰减公式,建立α0与地基土动力参数之间的公式化联系,通过地基土本身的参数来唯一确定α0。采用理论推导,现场试验以及和已有文献比对的方法,验证了本文所提方法的有效性和准确性,研究结果表明:(1)衰减公式中的几何衰减系数ζ0只会影响振动响应的幅值,但是对于传递路径上两点之间的振动传递比影响不大;(2)基于地基土的动力特性参数表征土体衰减系数具有较高的可靠性;(3)振动信号从低频到高频中,每一频率下参与土体振动的有效深度不一致,低频几乎影响各层土体,高频振动信号主要影响范围在表面。 相似文献
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Liu CHEN 《等离子体科学和技术》2020,22(10):102001
Nonlinear electromagnetic gyrokinetic equations have been constructed without expanding the field variables into background and finite but small-amplitude fluctuating components. At the long-wavelength limit, these unexpanded nonlinear gyrokinetic equations recover the well-known drift-kinetic equations. At the expanded limit, they recover the usual nonlinear gyrokinetic equations. These equations can therefore be applied to long-term simulations covering from microscopic to macroscopic spatial scales. 相似文献
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