منابع مشابه
Seasonal waves on glaciers
Seasonal waves accompanying annual changes in the sliding velocity of ice travel down glacier at speeds much faster than the ice itself. A simple explanation for these waves in terms of the passage of a pressure wave through the subglacial drainage system is given. Drainage by both distributed and localized systems is explored, with the sliding velocity governed by a dependence on the effective...
متن کاملWaves on glaciers
This paper is an attempt a t a mathematical synopsis of the theory of wave motions on glaciers. These comprise surface waves (analogous to water waves) and seasonal waves (more like compression waves). Surface waves have been often treated and are well understood, but seasonal waves, while observed, do not seem to have attracted any theoretical explanation. Additionally, the spectacular phenome...
متن کاملIsotropic realizability of electric fields around critical points
In this paper we study the isotropic realizability of a given regular gradient field ∇u as an electric field, namely when ∇u is solution of the equation div (σ∇u) = 0 for some isotropic conductivity σ > 0. The case of a function u without critical point was investigated in [5] thanks to a gradient flow approach. The presence of a critical point needs a specific treatment according to the behavi...
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© Foundation Compositio Mathematica, 1992, tous droits réservés. L’accès aux archives de la revue « Compositio Mathematica » (http: //http://www.compositio.nl/) implique l’accord avec les conditions générales d’utilisation (http://www.numdam.org/legal.php). Toute utilisation commerciale ou impression systématique est constitutive d’une infraction pénale. Toute copie ou impression de ce fichier ...
متن کاملOn Isotropic Sets of Points in the Plane. Application to Thedesign of Robotarchitectures
Various performance indices are used for the design of serial manipulators. One method of optimization relies on the condition number of the Jacobian matrix. The minimization of the condition number leads, under certain conditions, to isotropic configurations, for which the roundoff-error amplification is lowest. In this paper, the isotropy conditions, introduced elsewhere, are the motivation b...
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ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 1986
ISSN: 0022-1430,1727-5652
DOI: 10.1017/s0022143000012041