We examine the impact of transmit antenna selection with receive generalized selection combining (TAS/GSC) for cognitive decode-and-forward (DF) relaying in Nakagamim fading channels. We select a single transmit antenna at the secondary transmitter which maximizes the receive signal-tonoise ratio (SNR) and combine a subset of receive antennas with the largest SNRs at the secondary receiver. In ...

In this paper, we introduce an extension of Van Leer’s slope limiter for two-dimensional discontinuous Galerkin (DG) methods on arbitrary unstructured quadrangular or triangular grids. The aim is to construct a non-oscillatory shock capturing DG method for the approximation of hyperbolic conservative laws without adding excessive numerical dispersion. Unlike some splitting techniques that are l...

We discuss a recently proposed analytic solution to the Thomas– Fermi (TF) equation and show that earlier approaches provide more accurate results. In particular, we show that a simple and straightforward rational approximation to the TF equation yields the slope at origin with unprecedented accuracy, as well as remarkable values of the TF function and its first derivative for other coordinate ...

We propose a new continuum description of the dynamics of sandpile surfaces, which recognizes the existence of two populations of grains: immobile and rouing. Trie rolling grains are carried clown the slope with a constant drift velocity and have a certain dispersion constant. We introduce a simple bilinear approximation for the interconversion

Field observations of instantaneous water surface slopes in the swash zone are presented. For free-surface flows with a hydrostatic pressure distribution the surface slope is equivalent to the horizontal pressure gradient. Observations were made using a novel technique which in its simplest form consists of a horizontal stringline extending seaward from the beach face. Visual observation, still...

Using work of Ozsváth and Szabó, we show that if a nontrivial knot in S3 admits a lens space surgery with slope p, then p ≤ 4g+3, where g is the genus of the knot. This is a close approximation to a bound conjectured by Goda and Teragaito. AMS Classification numbers Primary: 57M25 Secondary: 57R58

We derive the form factors relevant for decays of pseudo-scalar mesons corresponding to the semi-leptonic decay B → Dlν. The simulations are performed in the quenched approximation at β = 6.0 and β = 6.2 using a non-perturbatively improved clover action. The slope of the Isgur Wise function and |V cb | are extracted from the form factors.

— We prove an arithmetic analogue of Fujita’s approximation theorem in Arakelov geometry, conjectured by Moriwaki, by using slope method and measures associated to R-filtrations. Résumé. — On démontre un analogue arithmétique du théorème d’approximation de Fujita en géométrie d’Arakelov — conjecturé par Moriwaki — par la méthode de pentes et les mesures associées aux R-filtrations.

An approximation to the exact derivative leads to perturbed fixed slope iterations in the context of Inexact Newton methods. We prove an a posteriori convergence theorem for such an algorithm, and show an application to nonlinear differential boundary value problems. The abstract setting is a complex Banach space. © 2004 Elsevier Ltd. All rights reserved.