Concept

Système de coordonnées

Publications associées (121)

A software package to manipulate space dependencies and geometry in magnetic confinement fusion

Improvement in the performance of magnetic confinement devices for nuclear fusion relies on the optimization of the geometry of the plasma: either the two-dimensional (2D) cross-section shape in tokamaks with toroidal symmetry or the 3D magnetic configurat ...

2005

Liquid Crystal Alignment Chemical Nanopatterns : Control over Azimuthal and Polar Alignment

Toralf Scharf

We discuss alignment properties of nematic liquid crystals on surfaces that contain homeotropic and planar alignment areas on the same surface substrate. The basic idea is to locally pattern homeotropic agents (silane) on surfaces that usually lead to plan ...

2005

Matrix-based analysis of digital images: application to goniophotometric measurements with variable referential

Marilyne Andersen

Digital video-based luminance mapping systems require the establishment of a precise relation between the considered spatial referential and the associated pixel coordinates on the image. Such a relation may vary with the measurement conditions, and an adj ...

Elsevier2005

Hard equality constrained integer knapsacks

Arjen Lenstra

We consider the following integer feasibility problem: Given positive integer numbers a0, a1,&mellip;,an with gcd(a1,&mellip;,an) = 1 and a = (a1,&mellip;,an), does there exist a ...

2004

Shape and deformation measurements of large objects by fringe projection

Anne-Isabelle Desmangles

The height and/or deformation of a surface of an object (10) defined in terms of x, y and z coordinates is measured by projecting a divergent beam of light 21) onto the surface to produce a periodic pattern of fringes (30. A CCD camera (40) views the surfa ...

2004

Non-linear subdivision using local spherical coordinates

Touradj Ebrahimi, Pierre Vandergheynst, Nicolas Aspert

In this paper, we present an original non-linear subdivision scheme suitable for univariate data, plane curves and discrete triangulated surfaces, while keeping the complexity acceptable. The proposed technique is compared to linear subdivision methods hav ...

2003

Nodal high-order discontinuous Galerkin methods for the spherical shallow water equations

Jan Sickmann Hesthaven

We present a high-order discontinuous Galerkin method for the solution of the shallow water equations on the sphere. To overcome well-known problems with polar singularities, we consider the shallow water equations in Cartesian coordinates, augmented with ...

Elsevier2002

Method for defining a location in a section under medical examination refers to a system of coordinates and subsequently to a collection of topological data

Theo Lasser

A targeting device (35) determines a first location in an area under examination with reference to a system (13) of coordinates and makes coordinates for the first location available as a first coordinate set allocated to the first location. A topology cap ...

2002

Use of Matrices for the Adaptation of Video-based Photogoniometric Measurements to a Variable Referential

Marilyne Andersen

Digital video based luminance mapping systems require the establishment of a precise relation between the considered spatial referential and the associated pixel coordinates on the image, that may vary with the measurement conditions. In this paper, an ada ...

2001

Local three-dimensional MHD stability in equilibrium optimized coordinates

Wilfred Anthony Cooper

The linear equation for ideal magnetohydrodynamic ballooning modes in three-dimensional configurations is derived in the coordinate system that is optimal for the representation of the equilibrium state. The magnetic field lines in this coordinate system, ...

2000

Graph Chatbot

Chattez avec Graph Search

Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.

AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.

Connectez-vous pour utiliser Chat avec Graph Search