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几何不变系的多刚片规则 被引量:1
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作者 周文华 《科技进步与对策》 CSSCI 北大核心 2003年第S1期261-262,共2页
现行的结构力学教科书给出的几何不变系的组成规则 ,一般由二元体规则、两刚片规则、三刚片规则组成。通过指出存在不能用这些规则进行几何组成分析的几何不变系 ,指明了如何由任意多个刚片构造这种几何不变系的方法 ,并提出了几保不变... 现行的结构力学教科书给出的几何不变系的组成规则 ,一般由二元体规则、两刚片规则、三刚片规则组成。通过指出存在不能用这些规则进行几何组成分析的几何不变系 ,指明了如何由任意多个刚片构造这种几何不变系的方法 ,并提出了几保不变系的四刚片规则、五刚片规则等多刚片规则。 展开更多
关键词 刚片 几何不变系 多刚片规则
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Symplectic invariants for curves and integrable systems in similarity symplectic geometry 被引量:2
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作者 LI YanYan QU ChangZheng 《Science China Mathematics》 SCIE CSCD 2015年第7期1415-1432,共18页
In this paper, similarity symplectic geometry for curves is proposed and studied. Explicit expressions of the symplectic invariants, Frenet frame and Prenet formulae for curves in similarity symplectic geometry are ob... In this paper, similarity symplectic geometry for curves is proposed and studied. Explicit expressions of the symplectic invariants, Frenet frame and Prenet formulae for curves in similarity symplectic geometry are obtained by using the equivariant moving frame method. The relationships between the Euclidean symplectic invariants, Frenet frame, Frenet formulae and the similarity symplectic invariants, Frenet frame, Frenet formulae for curves are established. Invariant curve flows in four-dimensional similarity symplectic geometry are also studied. It is shown that certain intrinsic invariant curve flows in four-dimensional similarity symplectic geometry are related to the integrable Burgers and matrix Burgers equations. 展开更多
关键词 similarity symplectic geometry integrable system symplectic invariant moving frame method matrix Burgers equation
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