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中国科学院声学研究人员揭示高频Lamb波在微尺度薄板中的传播特征（图）
尺度结构 力学性能 纳米
2024/4/18
当微尺度结构的特征尺寸减小到微纳米量级时，材料的力学性能对特征尺寸的变化非常敏感，受这种尺度效应影响，Lamb波在微尺度板中的传播特性与宏观尺度不同。研究微尺度板中Lamb波的频散及模态位移特征，有助于分析导波的可激发性、可探测性及波泄漏特点，可为导波无损检测技术提供理论指导。
日前，北京大学地球与空间科学学院理论与应用地球物理研究所张海明副教授与其弟子冯禧博士合著的《地震学中的Lamb问题（下）》由科学出版社出版。
在地震动数值模拟方法中，谱元法和有限元法是应用较广泛的两种方法。基于经典的Lamb问题模型，首先推导给出地表竖向位移的解析解答。然后分别利用常用的四阶谱元法和线性有限元法，模拟了地表脉冲力源作用下模型的位移响应。考虑有意义的最短波长内的采样点个数及单元高宽比的变化，对比了两种方法的模拟精度；结果表明：对于谱元法，观测点与波源之间需至少包含两个网格，在此条件下，最短波长内包含一个网格（最短波长内5个...
Professor Michael P. Lamb，Division of Geological and Planetary Sciences at California Institute of Technology（图）
Professor Michael P. Lamb Division of Geological and Planetary Sciences at California Institute of Technology
2014/4/8
B.S., University of Minnesota, 2001; M.S., University of Washington, 2004; Ph.D., University of California, Berkeley, 2008. Assistant Professor, Caltech, 2009-14; Professor, 2014-.
Sheep are ideally suited to small-scale and part-time farming operations in Pennsylvania due to their adaptability and nutritional versatility. Sheep can be fed a diet high in concen-trates (similar ...
Characterization and Classification of Rocks with Lamb Modes
Ultrasound Lamb Waves Nondestructive Investigation
2013/3/8
The nondestructive investigation by ultrasound has become a fundamental tool for characterizing rocks. We applied this technique for characterizing samples of rocks. The later had been members of the ...
Lamb Shift for static atoms outside a Schwarzschild black hole
Lamb Shift static atoms Schwarzschild black hole
2010/12/23
We study, by separately calculating the contributions of vacuum fluctuations and radiation reaction to the atomic energy level shift, the Lamb shift of a static two-level atom interacting with real ma...
Preparation of Schrödinger cat states with cold ions in a cavity beyond the Lamb-Dicke limit
Schrö dinger cat states cold ions the Lamb-Dicke limit
2010/11/8
We investigate the dynamics of a cold trapped ion coupled to the quantized field inside a high-finesse cavity. We have used an approach for preparing the SC states of motion of ion. This approach, bas...
Calculation of thermostable directions and the influence of bias electric field on the propagation of the Lamb and SH waves in langasite single crystal plates
Calculation of thermostable directions influence of bias electric field
2010/11/25
Paper is presented the results of computer simulation. Effect of the dc electric field nfluence on the propagation of Lamb and SH waves and its temperature coefficients of delay in piezoelectric langa...
Combining red- and blue-detuned optical traps to form a Lamb-Dicke trap for a single neutral atom
Combining red- and blue-detuned optical traps Lamb-Dicke trap single neutral atom
2010/11/16
We propose and demonstrate a scheme for strongly radially confining a single neutral atom in a bichromatic far-off resonance optical dipole trap(BFORT) . BFORT is composed of a blue-detuned Laguerre-...
Lamb Shift for static atoms outside a Schwarzschild black hole
Lamb Shift static atoms Schwarzschild black hole
2010/12/21
We study, by separately calculating the contributions of vacuum fluctuations and radiation
reaction to the atomic energy level shift, the Lamb shift of a static two-level atom interacting with real m...
The Nobel Prize in Physics 1955, Willis Eugene Lamb, for his discoveries concerning the fine structure of the hydrogen spectrum.
Complex coherence function represented by discrete formula on the basis of Lamb's problem for Rayleigh waves
Lamb's problem complex coherence function spatial autocorrelation method
2009/3/5
The spatial autocorrelation (SPAC) method requires a special circular array where several observation points are equally spaced on the circumference. In order to look for the possibility of developpin...
卷期页码：第27卷 第8期
(2006年8月) P.913
文章编号：1000-0887(2006)08-0913-10
微极各向同性弹性板中的Rayleigh-Lamb波
R·库玛1，G·帕塔泊2
1.库鲁克西察大学 数学系，库鲁克西察 136119，那亚那，印度；2.恩伯德卡国家工艺大学 应用数学系，加兰德哈 144011，庞加伯，印度
摘要：研究了无应力作用条件下，均匀、各向...
Quantum Logic Operation with Single Trapped Ion Without
Limitation of Lamb-Dicke Parameter
ion trap Lamb-Dicke parameter quantum logic operation
2007/8/15
2003Vol.39No.6pp.709-710DOI:
Quantum Logic Operation with Single Trapped Ion Without
Limitation of Lamb-Dicke Parameter
ZHANG Rong and ZHU Shi-Qun
School of Physical Sci...