Results 111 to 120 of about 7,785,042 (211)

An algorithm for the numerical evaluation of the associated Legendre functions that runs in time independent of degree and order

open access: yes, 2017
We describe a method for the numerical evaluation of normalized versions of the associated Legendre functions $P_\nu^{-\mu}$ and $Q_\nu^{-\mu}$ of degrees $0 \leq \nu \leq 1,000,000$ and orders $-\nu \leq \mu \leq \nu$ on the interval $(-1,1)$.
Bremer, James
core   +1 more source

Multiple Scattering Theory for Two-dimensional Electron Gases in the Presence of Spin-Orbit Coupling

open access: yes, 2005
In order to model the phase-coherent scattering of electrons in two-dimensional electron gases in the presence of Rashba spin-orbit coupling, a general partial-wave expansion is developed for scattering from a cylindrically symmetric potential.
Eric J. Heller   +5 more
core   +1 more source

Nonoscillatory half-linear difference equations and recessive solutions

open access: yesAdvances in Difference Equations, 2005
This paper is concerned with recessive and dominant solutions for the nonoscillatory second-order half-linear difference equations \[ \Delta(a_{n}\Phi(x_{n}))+b_{n}\Phi(x_{n+1})=0, \] where \(\Delta x_{n}=x_{n+1}-x_{n}\), \(\Phi(u)=| u| ^{p-2}u\) with \(p>1\), and \(\{a_{n}\},\{b_{n}\}\) are positive real sequences for \(n\geq1\). By using a uniqueness
M. CECCHI, Z. DOSLA, MARINI, MAURO
openaire   +4 more sources

Second-order accurate nonoscillatory schemes for scalar conservation laws [PDF]

open access: yes
Explicit finite difference schemes for the computation of weak solutions of nonlinear scalar conservation laws is presented and analyzed. These schemes are uniformly second-order accurate and nonoscillatory in the sense that the number of extrema of the ...
Huynh, Hung T.
core   +1 more source

A nonoscillatory, characteristically convected, finite volume scheme for multidimensional convection problems [PDF]

open access: yes
A new, nonoscillatory upwind scheme is developed for the multidimensional convection equation. The scheme consists of an upwind, nonoscillatory interpolation of data to the surfaces of an intermediate finite volume; a characteristic convection of surface
Huynh, Hung T., Yokota, Jeffrey W.
core   +1 more source

Nonoscillatory Solutions of Second Order Differential Equations with Integrable Coefficients [PDF]

open access: yesProceedings of the American Mathematical Society, 1990
The asymptotic behavior of nonoscillatory solutions of the equation x + a ( t ) | x | γ sgn ⁡ x = 0 , γ > 0 x + a\left ( t
openaire   +2 more sources

Necessary and sufficient conditions for oscillation of the solutions of even order differential equations

open access: yesJournal of Numerical Analysis and Approximation Theory, 2012
In this paper, we establish several necessary and sufficient conditions for oscillation of the solutions of the following even order differential equation\[x^{(n)}(t) + q(t)x^\gamma (t) = 0, \quad \mbox{$n$ is even},\]where \( q(t) \in C([t_0 ,\infty ),{\
Cheng Jin-Fa, Chu Yu-Ming
doaj   +2 more sources

Fite-Wintner-Leighton-Type Oscillation Criteria for Second-Order Differential Equations with Nonlinear Damping

open access: yesAbstract and Applied Analysis, 2013
Some new oscillation criteria for a general class of second-order differential equations with nonlinear damping are shown. Except some general structural assumptions on the coefficients and nonlinear terms, we additionally assume only one sufficient ...
Mervan Pašić
doaj   +1 more source

ULTRA-SHARP nonoscillatory convection schemes for high-speed steady multidimensional flow [PDF]

open access: yes
For convection-dominated flows, classical second-order methods are notoriously oscillatory and often unstable. For this reason, many computational fluid dynamicists have adopted various forms of (inherently stable) first-order upwinding over the past few
Leonard, B. P., Mokhtari, Simin
core   +1 more source

NONOSCILLATORY SOLUTIONS OF DELAY DIFFERENTIAL EQUATIONS WITH OSCILLATING COEFFICIENTS

open access: yesDemonstratio Mathematica, 1992
Nonoscillatory solutions of delay differential equations with oscillatory coefficients of the form \[ y'(t)+P_ 0(t)y(t)+\sum_{i=1}^ n P_ i(t)y(t-T_ i(t))=0\tag{1} \] are considered. The main results are: Theorem 1. Consider differential equation (1), where \(P_ 0(t)\), \(P_ i(t)\) and \(T_ i(t)\) are continuous functions such that \(| P_ 0(t)|\leq P_ 0\
openaire   +2 more sources

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