Results 101 to 110 of about 2,710 (220)

Ellipsoidal billiards in pseudo-Euclidean spaces and relativistic quadrics [PDF]

, 2012
We study the geometry of confocal quadrics in pseudo-Euclidean spaces of arbitrary dimension d and any signature, and related billiard dynamics. The goal is to give a complete description of periodic billiard trajectories within ellipsoids.
Dragović, Vladimir, Radnović, Milena
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Shaping Single Offset Reflector Antennas Using Local Axis-Displaced Confocal Quadrics

International Journal of Antennas and Propagation, 2016
This work investigates a novel numerical procedure for the solution of an exact formulation for the Geometrical Optics synthesis of a single reflector antenna by simultaneously imposing Snell’s Law and Conservation of Energy in a tube of rays, yielding a
Rafael A. Penchel, José R. Bergmann, Fernando J. S. Moreira   +2 more
doaj   +1 more source

Quadric representation of a submanifold [PDF]

Proceedings of the American Mathematical Society, 1992
If x : M n
openaire   +2 more sources

Finite temperature QCD on Quadrics

, 1996
Petersson B, Laermann E. Finite temperature QCD on Quadrics. Progress of the Theoretical Physics Suppl. 1996;122(122):85-96.Results from a large scale quenched simulation of QCD at finite temperature are presented.
Petersson, Bengt, Laermann, Edwin
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Gröbner Bases for Spaces of Quadrics of Low Codimension [PDF]

, 2000
Let R=⊕i≥0Ri be a quadratic standard graded K-algebra. Backelin has shown that R is Koszul provided dimR2≤2. One may wonder whether, under the same assumption, R is defined by a Gröbner basis of quadrics. In other words, one may ask whether an ideal I in
Conca, Aldo
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Cubic curves associated to quadrics [PDF]

Surveys in Mathematics and its Applications
he aim of this paper is to study two associated cubic curves C1,2(Γ) to a given Euclidean quadric Γ through two polynomials generated by the symmetric 3 × 3 and 4 × 4 matrices defining Γ.
Mircea Crâșmăreanu
doaj  

A new characterization of elliptic quadrics in PG(3, q), q odd

Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2018
We prove that a set O of points of PG(3,q), q odd, of line-type (0,m,n)_1, n ≠ q, with a point on which there are at most q+1 lines intersecting O in exactly m points is either an elliptic quadric or n = q + 1 and O is the complement of a line in PG(3,q).
Vito Napolitano
doaj   +1 more source

Toward a New Mathematical Definition of Datums in Standards to Support Advanced Manufacturing. [PDF]

J Comput Inf Sci Eng, 2023
Shakarji CM, Srinivasan V.
europepmc   +1 more source

Conchoid surfaces of quadrics

Journal of Symbolic Computation, 2013
The authors study parametric representations of conchoids of quadric surfaces from a computational point of view. To address the problem, let \({\mathbf f}={\mathbf f}(u,v)\) be a parameterization of a real surface \(F\subseteq \mathbb R^3\). Then, its conchoid surfaces \(F_d\) with respect to the sphere with center the origin and radius \(d\) can be ...
David Gruber, Martin Peternell
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Scaled-neighborhood Patches Fusion for Multi-view Stereopsis

MATEC Web of Conferences, 2016
In this paper, we present a multi-view stereo reconstruction approach which fuses scaled-neighborhood information. PMVS proposed by Furukawa is one of the most excellent algorithms, and it has a good performance on many datasets both the accuracy and the
An Ning, He Yicong, Dong Hang, Wang Fei
doaj   +1 more source