共搜索到2291条信息,每页显示10条信息,共230页。用时:0小时0分0秒312毫秒
......
Theoretical analysis of JMC effect on stress wave transmission and reflectionXin Chen1,2,Mei-feng Cai1,2,Jian-chuan Li3,Wen-hui Tan1,21. Beijing Key Laboratory of Urban Underground Space Engineering... parameter, a one-dimensional contacted interface model(CIM-JMC) was established in this study to describe the wave propagation across a single joint. According to this model, the reflected and transmitted......
Piezoelectric Actuator/Sensor Wave Propagation Based Nondestructive Active Monitoring Method of Concrete Structures朱劲松摘 要:In order to monitor the basic mechanical properties and interior damage of concrete structures,the piezoelectric actuator/sensor based wave propagation method was investigated experimentally in the laboratory using a specifically......
First principle study on the possibilities of magnetism in one-dimensional In and T1 atomic wires with the full-potential linearized augmented plane wave method Zhili ZHU1,Yu JIA1,Jinhua GU1,Xing... linearized augmented plane wave method, the possibilities of magnetism in one-dimensional In and TI wires were explored and their properties as the function of geometric structures were studied. The results......
; 文章编号:1672-7207(2011)S2-0246-06 2D numerical wave tank simulation for deployment of seafloor mining system HU Xiao-zhou1, LIU Shao-jun1, LI Yan1, 2 (1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; 2. The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China) Abstract: 2D numerical wave tanks......
Study on the Carbonyl Iron Powder Based Nano-Composite Radar Wave Absorbing Coatings LIANG wen-ting1,WANG Zhi-hui1,LI Wan-zhi1,HUANG Dong-zhen1,YAO Jun-min1,HU Chuan-xin1,LV Yan-hong1 (1.Beijing... to the HP1 and HP2 carbonyl iron powders by weight respectively. By a series of composite techniques, sample plate with the radar absorbing coating was prepared. Compared with the single coating, the wave......
"四大谣言"之再生能源篇Robert Lamb摘 要:可以说我们生活在一个激动人心的时代.互联网技术蒸蒸日上,对于自然界的认识达到了前所未有的高度,我们甚至能在自己的手机上观看电视节目.毋庸置疑,世界是在不断变化的,我们正好处于两个时代中间:一个是依靠石油,煤等资源燃烧的时代,另一个则是可再生能源占主流的未来时代.然而关于某些可再生能源的可靠性,以及它们能否保证人类在后化石燃料时代的需求,一些谣言,误解以及彻头彻尾的谎言纷纷浮上台面.在本文中,我们将摒弃诸如世界新秩序和外星科技之类的天方夜谭,简单给您介绍早已四处传开的关于可再生能源的4大谣言.关键词:......
......
......
STRESS WAVE PROPAGATION IN COMPOSITE WITH DIFFERENT FIBER END GEOMETRIES (Abstract)H. Pih,Q. Bi,Y.Y.chen,P.Ye摘 要:<正> The effect of fiber end geometries on the propagating stress wave in composite models was investigated by the dynamic photoelastic method. Aluminum fibers with rectangular, semicircular,V-and wedge-shape ends were cast in epoxy......