Results 71 to 80 of about 243 (108)

© Hindawi Publishing Corp. HYDRODYNAMIC EQUATIONS FOR INCOMPRESSIBLE INVISCID FLUID IN TERMS OF GENERALIZED STREAM FUNCTION

open access: yes, 2003
Hydrodynamic equations for ideal incompressible fluid are written in terms of generalized stream function. Two-dimensional version of these equations is transformed to the form of one dynamic equation for the stream function.
Yuri A. Rylov
core  

Uniqueness of the Positive Solution of Δu + f(u) = 0 in an Annulus

open access: yes, 1991
We give here an extension of the recent result of Kwong (which in turn extended earlier results of Coffman and McLeod and Serrin) on the uniqueness of the positive radial solution of a semilinear elliptic equation.
L. Zhang, Man Kam Kwong, Liqun Zhang
core  

Asymptotics of a Free Boundary Problem

open access: yes, 2007
As was shown by Kaper and Kwong [Differential and Integral Equations 3, 353--362], there exists a unique R ? 0, such that the differential equation u 00 + 2 + 1 r u 0 + u \Gamma u q = 0; r ? 0; (0 q !
Man Kam Kwong   +2 more
core  

On a Volume Constrained Variational Problem

open access: yes, 1998
Existence of minimizers for a volume constrained energy E(u) := Z \Omega W (ru)dx where L N (fu = z i g) = ff i ; i = 1; : : : ; P; is proved in the case where z i are extremal points of a compact, convex set in R d and under suitable assumptions ...
Irene Fonseca   +3 more
core  

Strongly indefinite systems with critical Sobolev exponents

open access: yes
We consider an elliptic system of Hamiltonian type on a bounded domain. In the superlinear case with critical growth rates we obtain existence and positivity results for solutions under suitable conditions on the linear terms.
Enzo Mitidieri   +2 more
core  

Maximum Principle for State-Constrained Optimal Control Problems Governed by Quasilinear Elliptic Equations

open access: yes
. In this paper, the authors study an optimal control problem for quasilinear elliptic PDEs with pointwise state constraints. Weak and strong optimality conditions of Pontryagin maximum principle type are derived.
Eduardo Casas, Jiongmin Yong
core  

Modulus continuity estimates for weak solutions of Laplace equation and Heat equation

open access: yes四川大学学报. 自然科学版
In this paper, we employ the perturbation method to study the modulus continuity estimates for Laplace equation and heat equation .Firstly, we investigate the modulus continuity estimate for the H1 weak solutions of the Laplace equation ∆ux=fx, x∈B1 on ...
WANG Jing, ZHANG Yong
doaj  

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