Symmetry Properties of Positive Solutions of Parabolic Equations on ℝ N : II. Entire Solutions

We consider nonautonomous quasilinear parabolic equations satisfying certain symmetry conditions. We prove that each positive bounded solution u on ? ^N  × (?∞, T) decaying to zero at spatial infinity uniformly with respect to time is radially symmetric around some origin in ? ^N . The origin depends on the solution but is independent of time. We also consider the linearized equation along u and prove that each bounded (positive or not) solution is a linear combination of a radially symmetric solution and (nonsymmetric) spatial derivatives of u. Theorems on reflectional symmetry are also given.     

Asymptotic Behavior of Least Energy Solutions for a Fractional Laplacian Eigenvalue Problem on ℝN

Acta Mathematica Sinica, English Series - We are interested in the existence and asymptotic behavior for the least energy solutions of the following fractional eigenvalue problem $$left({rm{P}}...     

On the Suitable Weak Solutions for the Cauchy Problem of the Boussinesq Equations

ＯｎｔｈｅＳｕｉｔａｂｌｅＷｅａｋＳｏｌｕｔｉｏｎｓｆｏｒｔｈｅＣａｕｃｈｙＰｒｏｂｌｅｍｏｆｔｈｅＢｏｕｓｓｉｎｅｓｑＥｑｕａｔｉｏｎｓＧｕｏＢｏｌｉｎｇ（郭柏灵），ＹｕａｎＧｕａｎｇｗｅｉ（袁光伟）（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＰｈｇｓｉ...     

Asymptotic of the Solutions of the Initial Boundary Value Problem for the Diffusion Equations for Semiconductors（Ⅱ）

The paper deal with the asymptotic behavior of the solutions to the initial boundary value problem for unipolar drift diffusion equations for semiconductors. Under the proper assumptions on doping profile and initial value, we prove that the smooth solutions to these evolutionary problems tend to the unique stationary solution exponentially as time tends to infinity.     

The Asymptotic Behavior of Solutions of Some Doubly Degenerate Nonlinear Parabolic Equations

Ｔｈｅ　Ａｓｙｍｐｔｏｔｉｃ　Ｂｅｈａｖｉｏｒ　ｏｆ　Ｓｏｌｕｔｉｏｎｓ　ｏｆ　Ｓｏｍｅ　Ｄｏｕｂｌｙ　Ｄｅｇｅｎｅｒａｔｅ　Ｎｏｎｌｉｎｅａｒ　Ｐａｒａｂｏｌｉｃ　ＥｑｕａｔｉｏｎｓＹａｎｇＪｉｎｓｈｕｎ（杨金顺）（ＤｅｐａｒｔｍｅｎｔｏｆＢａｓｉ...     

Liouville Type Theorems for Positive Solutions of Elliptic System in ℝ N

In this paper, by the Alexandrov-Serrin method of moving plane combined with integral inequalities, we prove some new Liouville type results for positive solution of semilinear elliptic system in the whole space ? ^N .     

The Cauchy Problem for Nonlinear Parabolic Equations with Lévy Laplacian

A solution to the Cauchy problem for a rather general class of nonlinear parabolic equations involving the infinite-dimensional Laplacian Δ_L of the form , where f is a real function defined on R³ is presented. Mathematics Subject Classifications (2000) 35R15, 46G05.     

On the Cauchy Problem for Nondegenerate Parabolic Integro-Differential Equations in the Scale of Generalized Hölder Spaces

Parabolic integro-differential nondegenerate Cauchy problem is considered in the scale of Hölder spaces of functions whose regularity is defined by a radially O-regularly varying Lévy measure. Existence and uniqueness and the estimates of the solution are derived.

     

Blow－Up and Mass Concentration of Solutions to the Cauchy Problem for Nonlinear Schrodinger Equations

Ｂｌｏｗ－ＵｐａｎｄＭａｓｓＣｏｎｃｅｎｔｒａｔｉｏｎｏｆＳｏｌｕｔｉｏｎｓｔｏ　ｔｈｅＣａｕｃｈｙＰｒｏｂｌｅｍｆｏｒＮｏｎｌｉｎｅａｒＳｃｈｒｏｄｉｎｇｅｒＥｑｕａｔｉｏｎｓ秦玉明Ｂｌｏｗ－ＵｐａｎｄＭａｓｓＣｏｎｃｅｎｔｒａｔｉｏｎｏｆＳｏｌｕ...     

Travelling Wave Solutions for Some Degenerate Parabolic Equations ( I )

The existence and regularity of travelling wave front solutions are studied forsome degenerate parabolic equationswith m,n>0 and f satisfies(H):f(u)∈C~1[0,1],f(0)<0, f(1)<0 and f'(1)<0.There exists a∈(0,1),s.t.f(u)<0 for u∈(0,a) and f(u)>0 for u∈(a,1). A function u=q(z)with z=x+ct is said to be a travelling wave front solution     

Stability of Solutions for a Class of Quasilinear Degenerate Parabolic Equations

ＳｔａｂｉｌｉｔｙｏｆＳｏｌｕｔｉｏｎｓｆｏｒａＣｌａｓｓｏｆＱｕａｓｉｌｉｎｅａｒＤｅｇｅｎｅｒａｔｅＰａｒａｂｏｌｉｃＥｑｕａｔｉｏｎｓ￥ＺｈａｏＪｕｎｎｉｎｇ（赵俊宁）（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｈｅｍａｔｉｃｓ，ＪｉｌｉｎＵｎｉｖｅｒｓｉｔ...     

Global Existence of Positive Solutions for Volterra Integral Equations

ＧｌｏｂａｌＥｘｉｓｔｅｎｃｅｏｆＰｏｓｉｔｉｖｅＳｏｌｕｔｉｏｎｓｆｏｒＶｏｌｔｅｒｒａＩｎｔｅｇｒａｌＥｑｕａｔｉｏｎｓＷａｎｇＳｈｕ（王术）；ＷａｎＣｈｕｎｌｉｎ（万春林）；ＺｈａｎｇＫｕｎ（张锟）（ＨｅｍａｎＵｎｉｖｅｒｓｉｔｙ，Ｋａｉｆｅｎ...     

Cauchy Problem of Some Doubly Degenerate Parabolic Equations with Initial Datum a Measure

This paper discusses the Cauchy problem of the equationu_t=▽·(▽_u~m|~(p-2)▽_u~m)-u~qwith initial datum a measure.Under the assumption of the parameters,one proves the existence andnou-existence of the non-negative generalized solution.     

Bifurcation Results for the Mean Curvature Equations Defined on all ℝ N

We prove certain local bifurcation results for the mean curvature problem.

Global Entropy Solutions of the Cauchy Problem for Nonhomogeneous Relativistic Euler System

We analyze the 2×2 nonhomogeneous relativistic Euler equations for perfect fluids in special relativity. We impose appropriate conditions on the lower order source terms and establish the existence of global entropy solutions of the Cauchy problem under these conditions.     

Optimal Three Cylinder Inequality at the Boundary for Solutions to Parabolic Equations and Unique Continuation Properties

Let Γ be a portion of a C ^1,α boundary of an n-dimensional domain D. Let u be a solution to a second order parabolic equation in D × (–T, T) and assume that u = 0 on Γ × (–T, T), 0 ∈ Γ. We prove that u satis.es a three cylinder inequality near Γ × (–T, T) . As a consequence of the previous result we prove that if u (x, t) = O (|x|^k) for every t ∈ (–T, T) and every k ∈ ℕ, then u is identically equal to zero. This work is partially supported by MURST, Grant No. MM01111258     

Continuity of Weak Solutions for Quasilinear Parabolic Equations with Strong Degeneracy

The aim of this paper is to study the continuity of weak solutions for quasilinear degenerate parabolic equations of the form U_t-Δφ(u)=O, whereφ■C~1(R~1)is a strictly monotone increasing function.Clearly,the above equation has strong degeneracy,i.e.,the set of zero points ofφ′(·)is permitted to have zero measure. This is an answer to an open problem in[13,p.288].     

Collapse Rate of Solutions of the Cauchy Problem for the Nonlinear Schrödinger Equation

We prove that solutions of the Cauchy problem for the nonlinear Schrödinger equation with certain initial data collapse in a finite time, whose exact value we estimate from above. We obtain an estimate from below for the solution collapse rate in certain norms.

     

Existence of Three Positive Solutions for Quasi-linear Boundary Value Problem

In this paper, we prove a new fixed point theorem in cones and obtain the existence of triple positive solutions for a class of quasi-linear three-point boundary value problems.     

Development of the Lomov Regularization Method for a Singularly Perturbed Cauchy Problem and a Boundary Value Problem on the Half-Line for Parabolic Equations with a “Simple” Rational Turning Point

Differential Equations - The Lomov regularization method was developed for the Cauchy problem and the mixed problem for a singularly perturbed parabolic equation in the case of a...