Results 41 to 50 of about 63,984 (305)

Formulation of a T-Matrix Approach for a Piecewise-Homogeneous Anisotropic Medium Excited by a Spherical Sound Wave

Mathematics, 2023
A piecewise-homogeneous medium, consisting of anisotropic layers, is excited by a primary spherical sound wave due to a point source lying in the exterior of the medium or in one of its layers.
Andreas Kalogeropoulos, Nikolaos L. Tsitsas   +1 more
doaj   +1 more source

Solution of the modified Helmholtz equation using mixed boundary conditions in an equilateral triangle

Partial Differential Equations in Applied Mathematics
The modified Helmholtz equation qxx+qyy−4β2q=0, is one of the basic equations of classical mathematical physics. In this paper we have obtained the solution of the boundary-value problems for the modified Helmholtz equation in an equilateral triangle. An
Pratul Gadagkar, Subhash Kendre, Pooja Paratane   +2 more
doaj   +1 more source

Scalar-tensor cosmological simulations

, 2008
We present $N$-body cosmlogical simulations in the framework of the Newtonian limit of scalar-tensor theories of gravity. The scalar field is described by a modified Helmholtz equation with a source that is coupled to the standard Poisson equation of ...
Abel Camacho, Alfredo Macias, Claus Lämmerzahl, M. A. Rodríguez-Meza   +3 more
core   +1 more source

Regularization modeling for large-eddy simulation of homogeneous isotropic decaying turbulence [PDF]

, 2008
Inviscid regularization modeling of turbulent flow is investigated. Homogeneous, isotropic, decaying turbulence is simulated at a range of filter widths.
Geurts, B.J., Kuczaj, A.K., Titi, E.S.
core   +3 more sources

On mean value properties involving a logarithm-type weight [PDF]

Mathematica Bohemica
Two new assertions characterizing analytically disks in the Euclidean plane $\mathbb{R}^2$ are proved. Weighted mean value property of positive solutions to the Helmholtz and modified Helmholtz equations are used for this purpose; the weight has a ...
Nikolay Kuznetsov
doaj   +1 more source

Solving the Helmholtz Equation for the Neumann Boundary Condition for the Pseudosphere by the Galerkin Method [PDF]

, 2011
In this paper, the Helmholtz equation for the exterior Neumann boundary condition for the pseudosphere in three dimensions using the global Galerkin method is studied.
Pleskunas, Jane
core   +1 more source

A simulational and theoretical study of the spherical electrical double layer for a size-asymmetric electrolyte: the case of big coions

, 2009
Monte Carlo simulations of a spherical macroion, surrounded by a size-asymmetric electrolyte in the primitive model, were performed. We considered 1:1 and 2:2 salts with a size ratio of 2 (i.e., with coions twice the size of counterions), for several ...
D. Boda, D. Frenkel, Enrique González-Tovar, F. Fenell-Evans, G. Iván Guerrero-García, M. B. Partenskii, M. P. Allen, Martín Chávez-Páez, P. C. Hiemenz, R. D. Vold, R. J. Hunter, R. J. Hunter, S. S. Dukhin, U. Marini Bettolo Marconi   +13 more
core   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Stochastic thermodynamics of active Brownian particles

, 2013
Examples of self propulsion in strongly fluctuating environment is abound in nature, e.g., molecular motors and pumps operating in living cells. Starting from Langevin equation of motion, we develop a fluctuating thermodynamic description of self ...
Chaudhuri, Debasish, Ganguly, Chandrima
core   +1 more source

Low-complexity computation of plate eigenmodes with Vekua approximations and the Method of Particular Solutions [PDF]

, 2013
This paper extends the Method of Particular Solutions (MPS) to the computation of eigenfrequencies and eigenmodes of plates. Specific approximation schemes are developed, with plane waves (MPS-PW) or Fourier-Bessel functions (MPS-FB). This framework also
Chardon, Gilles, Daudet, Laurent
core   +5 more sources