Results 21 to 30 of about 2,509 (116)

Mesh-based video coding for low bit-rate communications [PDF]

, 2006
In this paper, a new method for low bit-rate content-adaptive mesh-based video coding is proposed. Intra-frame coding of this method employs feature map extraction for node distribution at specific threshold levels to achieve higher density placement of ...
Ahmed, KM, Fernando, WAC, Kocharoen, P, Rajatheva, RMAP   +3 more
core   +1 more source

From symmetry breaking to Poisson Point Process in 2D Voronoi Tessellations: the generic nature of hexagons [PDF]

, 2007
We bridge the properties of the regular triangular, square, and hexagonal honeycomb Voronoi tessellations of the plane to the Poisson-Voronoi case, thus analyzing in a common framework symmetry breaking processes and the approach to uniform random ...
Lucarini, Valerio
core   +2 more sources

Aquila X--1: a low inclination soft X-ray transient [PDF]

, 1998
We have obtained I-band photometry of the neutron star X-ray transient Aql X--1 during quiescence. We find a periodicity at 2.487 cd-1, which we interpret as twice the orbital frequency (19.30+/-0.05 h).
Charles, P. A., Shahbaz, T., Sherman, N. D., Thorstensen, J. R.   +3 more
core   +3 more sources

Parameter Estimation and Confidence Regions in the Method of Light Curve Simulations for the Analysis of Power Density Spectra [PDF]

, 2009
The Method of Light Curve Simulations is a tool that has been applied to X-ray monitoring observations of Active Galactic Nuclei (AGN) for the characterization of the Power Density Spectrum (PDS) of temporal variability and measurement of associated ...
Awaki, Bevington, Greg Madejski, Markowitz, Markowitz, Marshall, Martin Mueller, Mueller, Papadakis, Press, Timmer   +10 more
core   +2 more sources

Kinetic and Dynamic Delaunay tetrahedralizations in three dimensions [PDF]

, 2003
We describe the implementation of algorithms to construct and maintain three-dimensional dynamic Delaunay triangulations with kinetic vertices using a three-simplex data structure.
Aurenhammer, Aurenhammer, Baer, Berg, Boissonnat, Boissonnat, Bottino, Bowyer, Choi, De Fabritiis, Devillers, Devillers, Devillers, Devroye, Edelsbrunner, Goodman, Honda, Honda, Honda, Kittel, Lauritsen, Lürig, Meineke, Meyer-Hermann, Miller, Mostafavi, Mücke, Mücke, Okabe, Schönhardt, Shewchuk, Shewchuk, Shewchuk, von Neumann, Weliky, Weliky, Xinjian   +36 more
core   +2 more sources

The Three Dimensional Structure of EUV Accretion Regions in AM Herculis Stars: Modeling of EUV Photometric and Spectroscopic Observations [PDF]

, 1998
We have developed a model of the high-energy accretion region for magnetic cataclysmic variables and applied it to {\it Extreme Ultraviolet Explorer} observations of 10 AM Herculis type systems.
Bailey J., Bailey J., Beuermann K., Cameron A. G. W., Cropper M. S., Ferrario L., Imamura J. N., King A. R., Kuijpers J., Martin M. Sirk, Mason K. O., Meggitt S. M. A., Ramsay G., Ramsay G., Rosen S. R., Schwope A. D., Schwope A. D., Schwope A. D., Schwope A. D., Steve B. Howell, Stockman H. S., Wickramasinghe D. T., Wickramasinghe D. T., Woelk U., Wu K.   +24 more
core   +3 more sources

The XMM-Newton serendipitous ultraviolet source survey catalogue [PDF]

, 2012
The XMM-Newton Serendipitous Ultraviolet Source Survey (XMM-SUSS) is a catalogue of ultraviolet (UV) sources detected serendipitously by the Optical Monitor (XMM-OM) on-board the XMM-Newton observatory. The catalogue contains ultraviolet-detected sources
A. A. Breeveld, A. Smith, A. Talavera, Adelman-McCarthy, Albrecht, Antokhin, Bertin, Bianchi, Bianchi, Boggess, Bohlin, Boksenberg, Bowyer, C. Brindle, Carruthers, Castelli, Clegg, Code, Davis, de Jager, Drory, Ehle, Fordham, Fordham, Fälker, Grevesse, Guainazzi, H. Ziaeepour, Henize, Henry, Jin, Johnson, K. O. Mason, Kawakami, Kimble, Kuin, Kuntz, Landolt, Lasker, M. J. Page, M. S. Cropper, M. Still, MacKenty, Martin, Mason, Monet, Morrissey, N. Loiseau, P. Murdin, Pei, Pineau, R. Mignani, Rocca-Volmerange, Roming, S. R. Rosen, Schlegel, Seymour, Sirianni, Smith, Stecher, Stetson, Strüder, Talavera, Trauger, Turner, V. N. Yershov, Vagnetti, van Duinen, Watson, Watson, York   +70 more
core   +2 more sources

Singular Continuation: Generating Piece-wise Linear Approximations to Pareto Sets via Global Analysis [PDF]

, 2011
We propose a strategy for approximating Pareto optimal sets based on the global analysis framework proposed by Smale (Dynamical systems, New York, 1973, pp. 531-544). The method highlights and exploits the underlying manifold structure of the Pareto sets,
Alberto Lovison, Debreu G.
core   +2 more sources

Periodicities In The X-Ray Intensity Variations of TV Columbae: An Intermediate Polar [PDF]

, 2003
We present results from a temporal analysis of the longest and the most sensitive X-ray observations of TV Columbae--an intermediate polar. The observations were carried out with the RXTE PCA, ROSAT PSPC, and ASCA.
Augusteijn T., Barrett P., Bonnet-Bidaud J. M., Cooke B. A., E. M. Schlegel, Hellier C., Hellier C., Hellier C., K. P. Singh, Motch C., Norton A. J., Norton A. J., Norton A. J., Norton A. J., Norton A. J., P. Barrett, Schrijver J., Schrijver J., V. R. Rana, Wynn G. A.   +19 more
core   +2 more sources

Numerical derivation of dispersion coefficients for flow through three‐dimensional randomly packed beds of monodisperse spheres

AIChE Journal, Volume 60, Issue 2, Page 749-761, February 2014., 2014
The longitudinal (DL) and transverse (DT) dispersion coefficients for flow through randomly packed beds of discrete monosized spherical particles are studied. The three‐dimensional (3‐D) porous‐medium model consists of thousands of spherical particles that are divided into cells using Voronoi diagrams. The relationship between the variation of the dual
Amir Jourak, J. Gunnar I. Hellström, T. Staffan Lundström, Vilnis Frishfelds   +3 more
wiley   +1 more source