Results 41 to 50 of about 892,367 (145)

An interhemispheric, statistical study of nightside spectral width distributions from coherent HF scatter radars [PDF]

, 2002
International audienceA statistical investigation of the Doppler spectral width parameter routinely observed by HF coherent radars has been conducted between the Northern and Southern Hemispheres for the nightside ionosphere.
Milan, S. E., N. Sato, Woodfield, E.E., Lester, M., M. Lester, N. Sato (7606136), Milan, S.E., M. Lester (7589660), K. Hosokawa, S. E. Milan, K. Hosokawa (7606139), Hosokawa, K., E. E. Woodfield (7590071), E. E. Woodfield, Sato, N., S. E. Milan (7594526), Woodfield, E. E.   +16 more
core   +2 more sources

Matrix-based Chebyshev collocation technique for nonlinear system of differential Riccati equations

Alexandria Engineering Journal
This paper presents a novel and efficient spectral collocation method for solving systems of differential Riccati equations (SDREs) with variable coefficients.
Ibtisam Aldawish, Lakhlifa Sadek, Zakia Hammouch, Ahmed Shafee, Ioan-Lucian Popa   +4 more
doaj   +1 more source

A generalized spectral collocation method with tunable accuracy for variable-order fractional differential equations

, 2015
We generalize existing Jacobi--Gauss--Lobatto collocation methods for variable-order fractional differential equations using a singular approximation basis in terms of weighted Jacobi polynomials of the form (1 ± ϰ)μPja,b(ϰ), where μ > -1.
Zhang, Zhongqiang, Karniadakis, George E., Zeng, Fanhai   +2 more
core   +1 more source

New Wavelets Collocation Method for Solving Second-Order Multipoint Boundary Value Problems Using Chebyshev Polynomials of Third and Fourth Kinds

Abstract and Applied Analysis, 2013
This paper is concerned with introducing two wavelets collocation algorithms for solving linear and nonlinear multipoint boundary value problems. The principal idea for obtaining spectral numerical solutions for such equations is employing third- and ...
W. M. Abd-Elhameed, E. H. Doha, Y. H. Youssri   +2 more
doaj   +1 more source

A New Numerical Algorithm for Solving a Class of Fractional Advection-Dispersion Equation with Variable Coefficients Using Jacobi Polynomials

Abstract and Applied Analysis, 2013
We propose Jacobi-Gauss-Lobatto collocation approximation for the numerical solution of a class of fractional-in-space advection-dispersion equation with variable coefficients based on Caputo derivative.
A. H. Bhrawy
doaj   +1 more source

Study on Spectral Interference in the Determination of Vanadium by ICP-OES

, 2020
Vanadium is an important scarce resource and strategic metal, and often coexists with a variety of complex metals in the form of secondary mineral phases in nature.
Zhang Yi, Li Ming, Li Lan-jie, Wang Shao-na, Liu Biao, Jin Xing, Du Hao, Zhao Bei-bei   +7 more
core   +1 more source

Thermal Analysis of Convective-Radiative Fin with Temperature-Dependent Thermal Conductivity Using Chebychev Spectral Collocation Method [PDF]

Journal of Applied and Computational Mechanics, 2018
In this paper, the Chebychev spectral collocation method is applied for the thermal analysis of convective-radiative straight fins with the temperature-dependent thermal conductivity.
George Oguntala, Raed Abd-Alhameed
doaj   +1 more source

Tensor Network Space-Time Spectral Collocation Method for Time-Dependent Convection-Diffusion-Reaction Equations

Mathematics
Emerging tensor network techniques for solutions of partial differential equations (PDEs), known for their ability to break the curse of dimensionality, deliver new mathematical methods for ultra-fast numerical solutions of high-dimensional problems ...
Dibyendu Adak, Duc P. Truong, Gianmarco Manzini, Kim Ø. Rasmussen, Boian S. Alexandrov   +4 more
doaj   +1 more source

Statistical characteristics of Doppler spectral width as observed by the conjugate SuperDARN radars [PDF]

, 2002
International audienceWe performed a statistical analysis of the occurrence distribution of Doppler spectral width around the day-side high-latitude ionosphere using data from the conjugate radar pair composed of the CUTLASS Iceland-East radar in the ...
Milan, S. E., N. Sato, T. Iyemori, T. Iyemori (7616135), Woodfield, E.E., Lester, M., A. S. Yukimatu, A. S. Yukimatu (7614353), M. Lester, N. Sato (7606136), Milan, S.E., M. Lester (7589660), K. Hosokawa, S. E. Milan, Yukimatu, A. S., Iyemori, T., K. Hosokawa (7606139), Hosokawa, K., E. E. Woodfield (7590071), E. E. Woodfield, Sato, N., Yukimatu, A.S., S. E. Milan (7594526), Woodfield, E. E.   +23 more
core   +2 more sources

Least-squares spectral collocation for discontinuous and singular perturbation problems [PDF]

, 2003
A least-squares spectral collocation scheme for discontinuous problems is proposed. For the first derivative operator the domain is decomposed in subintervals where the jumps are imposed at the discontinuities.
Heinrichs, Wilhelm
core   +1 more source