On exact solutions for the semiempirical equation of turbulent diffusion and the second-order closure methods

2007 ◽  
Vol 1 (2) ◽  
pp. 160-164
Author(s):  
A. I. Borodulin ◽  
B. M. Desyatkov
Keyword(s):  
Exact Solutions ◽  
Turbulent Diffusion ◽  
Second Order ◽  
Semiempirical Equation

scholarly journals A Partial Lagrangian Approach to Mathematical Models of Epidemiology

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
R. Naz ◽  
I. Naeem ◽  
F. M. Mahomed
Keyword(s):  
Mathematical Models ◽  
Exact Solutions ◽  
Numerical Solutions ◽  
First Integrals ◽  
Order Equation ◽  
Second Order ◽  
Lagrangian Approach ◽  
Hiv Model ◽  
First Order ◽  
Partial Lagrangian

This paper analyzes the first integrals and exact solutions of mathematical models of epidemiology via the partial Lagrangian approach by replacing the three first-order nonlinear ordinary differential equations by an equivalent system containing one second-order equation and a first-order equation. The partial Lagrangian approach is then utilized for the second-order ODE to construct the first integrals of the underlying system. We investigate the SIR and HIV models. We obtain two first integrals for the SIR model with and without demographic growth. For the HIV model without demography, five first integrals are established and two first integrals are deduced for the HIV model with demography. Then we utilize the derived first integrals to construct exact solutions to the models under investigation. The dynamic properties of these models are studied too. Numerical solutions are derived for SIR models by finite difference method and are compared with exact solutions.

Symmetries, ansätze and exact solutions of nonlinear second-order evolution equations with convection terms, II

2006 ◽  
Vol 17 (5) ◽  
pp. 597-605 ◽  
Author(s):  
ROMAN CHERNIHA ◽  
MYKOLA SEROV
Keyword(s):  
Exact Solutions ◽  
Evolution Equations ◽  
Applied Mathematics ◽  
Reaction Diffusion ◽  
Second Order ◽  
Lie Symmetries ◽  
Nonlinear Reaction ◽  
Diffusion Convection ◽  
Natural Way

New results concerning Lie symmetries of nonlinear reaction-diffusion-convection equations, which supplement in a natural way the results published in the European Journal of Applied Mathematics (9(1998) 527–542) are presented.

scholarly journals Cauchy Problems for Evolutionary Pseudodifferential Equations overp-Adic Field

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Bo Wu ◽  
Yin Li ◽  
Weiyi Su
Keyword(s):  
Exact Solutions ◽  
Pseudodifferential Operator ◽  
Second Order ◽  
Cauchy Problems ◽  
Pseudodifferential Equations ◽  
Mixed Classes

We study a class of evolutionary pseudodifferential equations of the second order int,  (∂2u(t,x)/∂t2+2a2Tα/2(∂u(t,x)/∂t)+b2Tαu(t,x)+c2u(t,x)=q(t,x)), wheret∈(0,z]andTαis pseudodifferential operator inx∈Qp, which defined by Weiyi Su in 1992. We obtained the exact solutions to the equations which belong to mixed classes of real andp-adic functions.

EXACT SOLUTIONS OF THE DIRAC EQUATION WITH A COULOMB PLUS SCALAR POTENTIAL IN 2 + 1 DIMENSIONS

2002 ◽  
Vol 11 (06) ◽  
pp. 483-489 ◽  
Author(s):  
SHI-HAI DONG ◽  
XIAO-YAN GU ◽  
ZHONG-QI MA ◽  
SHISHAN DONG
Keyword(s):  
Dirac Equation ◽  
Differential Equations ◽  
Exact Solutions ◽  
Coulomb Potential ◽  
Scalar Potential ◽  
Second Order ◽  
First Order ◽  
Second Order Differential Equations

The exact solutions of the (2+1)-dimensional Dirac equation with a Coulomb potential and a scalar one are analytically presented by studying the second-order differential equations obtained from a pair of coupled first-order ones. The eigenvalues are studied in some detail.

scholarly journals Systematic study of exact solutions in second-order conformal hydrodynamics

2014 ◽  
Vol 89 (11) ◽  
Author(s):  
Yoshitaka Hatta ◽  
Jorge Noronha ◽  
Bo-Wen Xiao
Keyword(s):  
Exact Solutions ◽  
Systematic Study ◽  
Second Order

scholarly journals The dispersionless Veselov–Novikov equation: symmetries, exact solutions, and conservation laws

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Oleg I. Morozov ◽  
Jen-Hsu Chang
Keyword(s):  
Conservation Laws ◽  
Exact Solutions ◽  
Second Order ◽  
Invariant Solutions ◽  
Arbitrary Degree ◽  
Spatial Variables ◽  
Particular Solutions ◽  
Novikov Equation

AbstractWe study symmetries, invariant solutions, and conservation laws for the dispersionless Veselov–Novikov equation. The emphasis is placed on cases when the odes involved in description of the invariant solutions are integrable by quadratures. Then we find some non-invariant solutions, in particular, solutions that are polynomials of an arbitrary degree $$N \ge 3$$ N ≥ 3 with respect to the spatial variables. Finally we compute all conservation laws that are associated to cosymmetries of second order.

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