Results 1 to 10 of about 38,842 (262)

Difference equations as models of evolutionary population dynamics

open access: yesJournal of Biological Dynamics, 2019
We describe the evolutionary game theoretic methodology for extending a difference equation population dynamic model in a way so as to account for the Darwinian evolution of model coefficients.
J. M. Cushing
doaj   +2 more sources

Time domain analysis of impulse electromagnetic field at the interface of two media

open access: yesВісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2021
Background. Ultrashort pulses of electromagnetic field are widely used in construction, archeology and demining, etc., by constructing effective georadars of the underlying surface, but theoretical study of physical processes of irradiation of medium is ...
D. I. Havrylenko   +2 more
doaj   +1 more source

Irradiation of media by transient field: analytical solving of the problem

open access: yesВісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2022
Background. Application of transient electromagnetic waves for the remote sensing problems is perspective because of large information capacity of these fields and ability to penetrate into the medium with losses deeply.
D. I. Havrylenko   +2 more
doaj   +1 more source

Asymptotic Motion of a Satellite under the Action of Sdot Magnetic Attitude Control

open access: yesAerospace, 2022
Satellite angular motion under the action of the Sdot one-axis magnetic control algorithm is analyzed. Sdot control stabilizes the maximum moment of inertia axis towards the Sun.
Dmitry Roldugin   +2 more
doaj   +1 more source

Evolutionary Relation of Mathematical Physics Equations Evolutionary Relation as Foundation of Field Theory Interpretation of the Einstein Equation

open access: yesAxioms, 2021
It was shown that from the mathematical physics equations that are composed of the conservation laws equations for energy, momentum, angular momentum, and mass and describe material media such as thermodynamical, gas-dynamical, cosmic, and others, it ...
Ludmila Petrova
doaj   +1 more source

Estimates for evolutionary partial differential equations in classical function spaces

open access: yesForum of Mathematics, Sigma, 2023
We establish new local and global estimates for evolutionary partial differential equations in classical Banach and quasi-Banach spaces that appear most frequently in the theory of partial differential equations.
Alejandro J. Castro   +3 more
doaj   +1 more source

Numerical analysis of the Volterra differential equations via a combination of evolutionary algorithms with moving least squares and finite difference methods

open access: yesThe Journal of Engineering, 2021
In this paper, the Volterra differential equations governing on the predator‐prey dynamics is numerically solved through the combination of evolutionary algorithms with Moving Least Squares as well as the Finite Difference Method.
Mohammad Javad Mahmoodabadi
doaj   +1 more source

Exp-function Method and Reduction Transformations for Rogue ‎Wave Solutions of the Davey-Stewartson Equations‎ [PDF]

open access: yesJournal of Applied and Computational Mechanics, 2021
A pair of rogue wave solutions of the Davey-Stewartson (DS) equations are obtained by using the exp-function method and reduction transformations. Firstly, the Davey-Stewartson equations are transformed into two easy-to-solve equations, one of which is ...
Sheng Zhang, Yue Zhang, Bo Xu
doaj   +1 more source

5D Nonlinear Dynamic Evolutionary System in Real Estate Market

open access: yesComplexity, 2021
In this paper, we propose a new predator-prey nonlinear dynamic evolutionary model of real estate enterprises considering the large, medium, and small real estate enterprises for three different prey teams.
Jingyuan Zhang
doaj   +1 more source

Decay estimates for solutions of evolutionary damped p-Laplace equations

open access: yesElectronic Journal of Differential Equations, 2021
In this note, we study the asymptotic behavior, as t tends to infinity, of the solution u to the evolutionary damped p-Laplace equation $$ u_{tt}+ u_t =\Delta_p u $$ with Dirichlet boundary conditions.
Farid Bozorgnia, Peter Lewintan
doaj   +3 more sources

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