- curvature sign
- 曲面征<超声术语>
Medical Chinese dictionary (湘雅医学词典). 2013.
curvature sign
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Curvature invariant (general relativity) — Curvature invariants in general relativity are a set of scalars called curvature invariants that arise in general relativity. They are formed from the Riemann, Weyl and Ricci tensors which represent curvature and possibly operations on them such… … Wikipedia
Sign convention — In physics, a sign convention is a choice of the physical significance of signs (plus or minus) for a set of quantities, in a case where the choice of sign is arbitrary. Arbitrary here means that the same physical system can be correctly… … Wikipedia
Curvature — In mathematics, curvature refers to any of a number of loosely related concepts in different areas of geometry. Intuitively, curvature is the amount by which a geometric object deviates from being flat, or straight in the case of a line, but this … Wikipedia
Curvature of Riemannian manifolds — In mathematics, specifically differential geometry, the infinitesimal geometry of Riemannian manifolds with dimension at least 3 is too complicated to be described by a single number at a given point. Riemann introduced an abstract and rigorous… … Wikipedia
Sign — Any abnormality that indicates a disease process, such as a change in appearance, sensation, or function, that is observed by a physician when evaluating a patient. * * * 1. Any abnormality indicative of disease, discoverable on examination of… … Medical dictionary
curvature of space — Physics, Astron. 1. (in relativity) a property of space near massive bodies in which their gravitational field causes light to travel along curved paths. 2. (in cosmology) a large scale property of the universe that has an algebraic sign that… … Universalium
curvature of space — Physics, Astron. 1. (in relativity) a property of space near massive bodies in which their gravitational field causes light to travel along curved paths. 2. (in cosmology) a large scale property of the universe that has an algebraic sign that… … Useful english dictionary
Coca-Cola Sign — The Times Square Coca Cola Sign is an electro kinetic sculpture created in 2004, replacing the famous three dimensional bottle design that stood for years in the center of Times Square. Entitled Simply Coke, the sign is covered in programmable… … Wikipedia
Radius of curvature (optics) — Radius of curvature has specific meaning and sign convention in optical design. A spherical lens or mirror surface has a center of curvature located in (x, y, z) either along or decentered from the system local optical axis. The vertex… … Wikipedia
Mean curvature — In mathematics, the mean curvature H of a surface S is an extrinsic measure of curvature that comes from differential geometry and that locally describes the curvature of an embedded surface in some ambient space such as Euclidean space. The… … Wikipedia
Principal curvature — Saddle surface with normal planes in directions of principal curvatures In differential geometry, the two principal curvatures at a given point of a surface are the eigenvalues of the shape operator at the point. They measure how the surface… … Wikipedia
