1) closed geodesic
闭测地线
1.
The paper discusses the relations between parallel vector fields and Jacobi fields in a complete Riemannian manifold, and proves that there exists infinite closed geodesics in a local symmetric space which is orientable, compact, nonsimply connected and with nonnegative sectional curvature.
讨论了曲率定号的完备黎曼流形上的平行向量场与Jacobi场之间的关系;证明了紧致的偶数维具非负曲率的非单连通局部对称空间上存在无穷多条长度一样的闭测地线。
2.
In this thesis, we mainly study the volume growth of complete noncompact Riemannian manifold with nonnegative curvature, which has relations with closed geodesics and critical points of distance functions.
在本文中,我们主要研究具有非负曲率完备非紧流形的体积增长与闭测地线及距离函数临界点一些关系。
2) elliptic and hyperbolic closed geodesic
椭圆与双曲闭测地线
3) line ties
测线闭合
4) closed loop on-line test
闭环在线测试
5) looping
['lu:piŋ]
闭合导线观测
6) geodesic
[英][,dʒi:əu'desik] [美][,dʒiə'dɛsɪk]
测地线
1.
The study of geodesic of three patterns in hyperbolic space;
双曲空间中三种模型的测地线研究
2.
On some properties of geodesic and totally geodesic submanifold in Finsler manifold;
Finsler流形中测地线与全测地子流形的几个性质
3.
Based on the geodesic,a novel parallel equidistant path generation algorithm for composite fiber placement was implemented.
针对复合材料自动铺丝技术轨迹规划问题,提出了一种新的基于测地线的平行等距轨迹规划算法。
补充资料:闭测地线
闭测地线
dosed geodesic
闭测地线「d姗dge川esic;,日”.职.翻.侧呱e,洲.a.国1 在R iemaon流形(Riemannian manifold)M上,本身是测地线(罗记esic hne)的闭光滑曲线.更一般的概念是珍跨铡毕攀(罗odesic loop),即当‘一“和‘一b时通过同一点p的测地线以O(a感t(b);作为闭曲线它在点p可能有一个角一条环路测地线是一条闭测地线,仅当它没有角,即城t)在t=a和t”b有相同的切线.在自然射影TM~M下,M的切丛TM中的测地流(罗odesic flow)的闭轨线被投影成闭测地线.同一条闭测地线被绕行多次而得到的曲线称为多重闭测地线(multipled倪ed罗odesie).非多重的闭测地线称为简单闭测地线(s im川ed份ed罗odesic)· 闭测地线和环路测地线的定义可逐字不变地搬到M具有Finsler度t(Finsler metrie)或仿射联络(affineconneetion)的情形.如果M是一个度量空间(此时测地线定义成局部最短线),环路测地线的定义仍是相同的,但闭测地线的定义需稍作修改,因为光滑性或角的概念并不存在.考虑环路测地线,(t)(a(t(b),这里下(a)=下(b)=P且下在任何子区间上都不是常值,如果对充分小的。>O,线 _(v(b十、)一“、:、住 ,“’二!了‘“十‘,·。
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