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A METHOD FOR SOLVING THE DYNAMICS OF MULTIBODY SYSTEMS WITH RHEONOMIC AND NONHOLONOMIC CONSTRAINTS
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作者 水小平 张永发 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1996年第6期577-584,共8页
The solution of the dynamic problem of multibody systems subject to rheonomic and nonholonomic constraints is achieved by applying singular value decomposition of the constraint matrix and projections of the dynamic e... The solution of the dynamic problem of multibody systems subject to rheonomic and nonholonomic constraints is achieved by applying singular value decomposition of the constraint matrix and projections of the dynamic equations of the systems along the feasible and unfeasible directions of the constraints. Formula to solve the constraint reaction forces and a method to avoid the violation of the constraints are also given.The solution does not rely on coordinates used to describe the systems and is computational efficitive example is finally presnted. 展开更多
关键词 dynamic. multibody system nonholonomic constraint rheonomic constraint singular value decomposition. projection
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Influences of the Three Gorges Project on seismic activities in the reservoir area 被引量:11
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作者 Yun-Sheng Yao Qiu-Liang Wang +5 位作者 Wu-Lin Liao Li-Fen Zhang Jun-Hua Chen Jing-Gang Li Li Yuan Yan-Nan Zhao 《Science Bulletin》 SCIE EI CAS CSCD 2017年第15期1089-1098,共10页
Reservoir-induced earthquakes related with the construction of the Three Gorges Project have attracted great concerns of the public. Since the first water impoundment on May 25, 2003, a number of earthquakes have occu... Reservoir-induced earthquakes related with the construction of the Three Gorges Project have attracted great concerns of the public. Since the first water impoundment on May 25, 2003, a number of earthquakes have occurred during the water storage stages, in which the largest was the Badong M5.1 earthquake on December 16, 2013. In this paper, the relationships between seismic activities, b value, seismic parameters, and reservoir water level fluctuations are studied. In addition, based on the digital seismic waveform data obtained since 2000, the focal depth changes and focal mechanism characteristics before and after the water impoundment are studied as well. These provide us important information to understand the earthquake mechanisms. The results show that these earthquakes are typical reservoir-induced earthquakes, which are closely related to water infiltration, pore pressure, and water level fluctuations.The majority of the micro and small earthquakes are caused by karst collapse, mine collapse, bank reformation, superficial unloading, and so on. The larger earthquakes are related to the fault structures to some extent. Due to the persistent effects of water impoundment on the seismic and geological environments around the reservoir and water infiltration into the rocks, the influences on the crustal deformation field, gravity field, seepage field, and fault medium-softening action may vary gradually from a higher strength to a weaker one. Therefore, it is possible that small earthquakes and few medium earthquakes(M≤5.5) will occur in the reservoir area in the future. 展开更多
关键词 Three Gorges project Earthquake monitoring network Reservoir-induced earthquake Seismic activity b value Focal mechanism
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Mackey Theory for p-adic Lie Groups
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作者 Bing Yong HSIE 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2006年第2期507-514,共8页
This paper gives a p-adic analogue of the Mackey theory, which relates representations of a group of type G - H × t A to systems of imprimitivity.
关键词 Cosmooth projection valued measure System of imprimitivity Cosmooth system of imprimitivity Smooth representation
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