Results 51 to 60 of about 12,654,125 (372)

Study on computational efficiency of composite schemes for convection-diffusion equations using single-grid and multigrid methods

open access: yesJournal of Thermal Science and Technology, 2015
The computational efficiency of different composite schemes for the convection terms of the convection-diffusion equations is systematically studied in this paper.
Jingfa LI   +4 more
doaj   +1 more source

Dynamical Sieve of Eratosthenes

open access: yes, 2011
In this document, prime numbers are related as functions over time, mimicking the Sieve of Eratosthenes. For this purpose, the mathematical representation is a uni-dimentional time line depicting the number line for positive natural numbers N, where each
Mateos, Luis A.
core   +2 more sources

Composite functional metasurfaces for multispectral achromatic optics [PDF]

open access: yesNature Communications, 2016
Nanostructured metasurfaces offer unique capabilities for subwavelength control of optical waves. Based on this potential, a large number of metasurfaces have been proposed recently as alternatives to standard optical elements.
O. Avayu   +3 more
semanticscholar   +1 more source

Composite electric S-brane solutions with maximal number of branes

open access: yes, 2004
In this paper we consider (n+1)-dimensional cosmological model with scalar field and antisymmetric (p+2)-form. Using an electric composite Sp-brane ansatz the field equations for the original system reduce to the equations for a Toda-like system with n(n-
D Singleton   +24 more
core   +1 more source

Approximation and entropy numbers of composition operators [PDF]

open access: yesConcrete Operators, 2020
Abstract We give a survey on approximation numbers of composition operators on the Hardy space, on the disk and on the polydisk, and add corresponding new results on their entropy numbers, revealing how they are different.
Li, Daniel   +2 more
openaire   +4 more sources

Approximation numbers of weighted composition operators [PDF]

open access: yesJournal of Functional Analysis, 2018
We study the approximation numbers of weighted composition operators $f\mapsto w\cdot(f\circ )$ on the Hardy space $H^2$ on the unit disc. For general classes of such operators, upper and lower bounds on their approximation numbers are derived. For the special class of weighted lens map composition operators with specific weights, we show how much the
G. Lechner   +3 more
openaire   +5 more sources

Heat Treated NiP–SiC Composite Coatings: Elaboration and Tribocorrosion Behaviour in NaCl Solution [PDF]

open access: yes, 2009
Tribocorrosion behaviour of heat-treated NiP and NiP–SiC composite coatings was investigated in a 0.6 M NaCl solution. The tribocorrosion tests were performed in a linear sliding tribometer with an electrochemical cell interface.
A Hovestad   +37 more
core   +2 more sources

Photocatalytic activity of SnO2–α-Fe2O3 composite mixtures: exploration of number of active sites, turnover number and turnover frequency

open access: yes, 2018
SnO2 and α-Fe2O3 were prepared by a sol–gel method and their composite (SnO2–α-Fe2O3) systems were synthesized by combining SnO2 with α-Fe2O3 in various weight percent ratios.
L. Devi, R. Shyamala
semanticscholar   +1 more source

Network topology drives population temporal variability in experimental habitat networks

open access: yesPopulation Ecology, EarlyView.
Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu   +3 more
wiley   +1 more source

Distribution of Composite Numbers and Determination of Prime Numbers

open access: yes, 2021
Integer is either a composite number or a prime number. Therefore, detecting composite numbers is important for solving prime numbers. The study of prime numbers, apart from satisfying human curiosity, can be very important. In this article, the order of composite numbers has been detected. And explained with a simple method and a simple function. And,
openaire   +4 more sources

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