Geometry, kinematics and evolution o

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篇1：Noncommutative Geometry and Classica

Noncommutative Geometry and Classical Orbits of Particles in a Central Force Potential

We investigate the effect of the noncommutative geometry on the classical orbits of particles in a central force potential The relation is implemented through the modified commutation relations [xi,xj] = iθij. Comparison with observations places severe constraints on the value of the noncommutativity parameter.

作 者：B.Mirza M.Dehghani  作者单位：B.Mirza(Department of Physics, Isfahan University of Technology, Isfahan 84154, Iran;Institute for Studies in Theoretical Physics and Mathematics, P.O. Box 5746, Tehran 19395, Iran)

M.Dehghani(Department of Physics, Isfahan University of Technology, Isfahan 84154, Iran)

刊 名：理论物理通讯（英文版）  ISTIC SCI英文刊名：COMMUNICATIONS IN THEORETICAL PHYSICS 年，卷(期)：2004 42(8) 分类号：O57 关键词：noncommutative geometry   planetary orbits  

篇2：Geometry, kinematics and evolution o

Geometry, kinematics and evolution of the Tongbai orogenic belt

The Tongbai orogenic belt (TOB) is composed of six tectonic units. From south to north these units are: Tongbai gneiss rise (TGR); Hongyihe-Luozhuang eclogite belt (HLE); Maopo-Hujiazhai igneous rock belt (MHI); Zhoujiawan flysch belt (ZFB); Yangzhuang greenschist belt (YGB); and Dongjiazhuang marble belt (DMB).The geometry and kinematic images of the TOB include: the antiformal structures caused by a later uplift process, the top-to-north ductile shear structure that related to a process that the ultrahigh pressure rocks are brought to surface, the top-to-south ductile shear thrust and the sinistrial shear structures related to a south-north direction compression, and the east-west direction fold structures in the upper crust. In the view of the multistage subduction-collision orogenic belt, according to the characters of petrology and its distribution, geometry, kinematics and structural chronology in these tectonic units, tectonic evolution of the TOB can be divided into four stages: oceanic crust subduction during 400-300 Ma, continental collision during 270-250 Ma, continental deep subduction and uplift during 250-205 Ma and doming deformation during 200-185 Ma.

作 者：HUANG Shaoying XU Bei WANG Changqiu ZHAN Sheng DENG Rongjing  作者单位：The Key Laboratory of Orogenic Belts and Crustal Evolution Peking University, Ministry of Education, Beijing 100871, China 刊 名：中国科学D辑（英文版）  SCI英文刊名：SCIENCE IN CHINA SERIES D (EARTH SCIENCES) 年，卷(期)：2006 49(8) 分类号：O1 关键词：Tongbai   geometry   kinematics   tectonic unit   orogenic belt evolution