由Dirac方程研究带电蒸发黑洞的新方法

该文从Ｄｉｒａｃ方程本身直接导出带电蒸发黑洞的视界位置和Ｈａｗｋｉｎｇ温度，提出了由Ｄｉｒａｃ方程研究带电蒸发黑洞的新方法     

高阶非齐次GBBM方程

本文研究了高阶非齐次ＧＢＢＭ方程的Ｃａｕｃｈｙ问题和初边值问题。对任意的有界或无界光滑区域Ω，采用Ｂａｎａｃｈ不动点原理及一系列的积分估计，建立了高阶非齐次ＧＢＢＭ方程的Ｃａｕｃｈｙ问题和初边值问题在Ｗ＾２ｍ，ｐ（Ω）上整体强解的存在唯一性，这些结果改进并完善了ＢＢＭ方程的已有结果，与此同时，我们还讨论了强解的正则性。     

LIPSCHITZ柱形域上具Lp,q边值的抛物方程边值问题

设Ω为Ｒｎ中—Ｌｉｐｓｃｈｉｔｚ区域，ＳＴ为柱形域的边界Ω×（０，Ｔ）本文研究了此区域上的一般二阶常系数抛物方程具Ｌｐｑ边值的抛物方程边值问题．采用Ｒ．Ｂｒｏｗｎ和Ｚ．Ｓｈｅｎ的方法，我们证明了所涉及的双层位势和单层位势算子的可逆性，从而证明了初边值问题的唯一可解性，而且这种解可由位势算子表示．     

关于Dirac结构

本文给出了 Ｄｉｒａｃ流形几何化的刻画;证明了 Ｐｏｉｓｓｏｎ流形上的Ｄｉｒａｃ结构是Ｃｏｕｒａｎｔ最初定义的 Ｄｉｒａｃ结构通过扭曲得到的．     

关于双特征Beltrami方程

该文研究空间Ｂｅｌｔｒａｍｉ方程的推广形式，即双特征Ｂｅｌｔｒａｍｉ方程．利用外微分形式与矩阵的外代数等工具，将双特征Ｂｅｌｔｒａｍｉ方程转化为一个非齐次的狆 调和方程，转化过程中只用到加于特征矩阵的一致椭圆型条件．然后验证了算子犃满足的条件：Ｌｉｐｓｃｈｉｔｚ型条件、单调不等式、齐次性条件以及算子犅满足的控制增长条件．并利用得到的狆 调和方程，给出了双特征Ｂｅｌｔｒａｍｉ方程广义解分量函数的弱单调性结果．     

三维静态Landau-Lifshitz方程组多重正则解的存在性

对三维Ｌａｎｄａｕ－Ｌｉｆｓｈｉｔｚ方程常边值问题,证明了当λ＞λ１时,存在两个正则解,当λ＞ｍａｘ（λ１,λ）时,存在三个正则解,除常数外,还有一个是非轴对称极小解,另一个是轴对称解,其中λ１是－△算子齐次Ｄｉｒｉｃｈｌｅｔ问题的第一特征值,     

电磁蒸发黑洞中Dirac粒子的量子热效应

本文从弯曲时空中电磁Ｄｉｒａｃ粒子的场方程出发，研究了电磁蒸发黑洞的ｄｉｒａｃ粒子的量子热效应，得到了这类黑洞的视界面方程，温度函数以及Ｈａｗｋｉｎｇ热谱公式．     

四元数分析中超球与双圆柱区域上的正则函数

本文讨论了四元数分析中的正则函数Ｕ（ｚ）（满足方程ｚＵ（ｚ）＝０,ｚ＝ｘ１＋ｉｘ２＋ｊｘ３－ｋｘ４）及其边值问题,给出了超球与双圆柱区域上的四元数正则函数的Ｃａｕｃｈｙ积分公式,获得了一般区域上正则函数的无穷次可微性;给出了定义在超球与双圆柱区域边界上的四元数函数可正则开拓到区域内的条件;讨论了满足非齐次方程ｚＦ＝ｆ的四元函数Ｆ（ｚ）的Ｄｉｒｉｃｈｌｅｔ和Ｎｅｕｍａｎｎ边值问题;获得了超球与双圆柱区域上这两种边值问题解的积分表示．     

Ginzburg-Landau方程的非齐次初边值问题

研究具非线性边界条件的一类广义Ginzburg-Landau方程解的整体存在性．推导了Ginzburg-Landau方程的非齐次初边值问题光滑解的几个积分恒等式,由此得到了解的法向导数在边界上的平方模以及解的平方模和导数的平方模估计;通过逼近技巧、先验估计和取极限方法证明了Ginzburg-Landau方程的非齐次初边值问题整体弱解的存在性．     

一类变系数非齐次调和方程边值问题的级数解

利用由三角级数和幂级数复合构成的函数项级数的有关性质,得到了一类变系数非齐次调和方程边值问题的级数解.使变系数非齐次调和方程边值问题的求解有了新的进展.     

On the diffusion equation and diffusion wavelets on flat cylinders and the n‐torus

In this paper we study the solutions to the diffusion equation on some conformally flat cylinders and on the n‐torus. Using the Clifford algebra calculus with an appropriate Witt basis, the solutions can be expressed as multiperiodic eigensolutions to the parabolic Dirac operator. We study their fundamental properties, give representation formulas of all these solutions and develop some integral representation formulas. In particular we set up a Green type formula for the solutions to the homogeneous diffusion equation on cylinders and tori. Then we also treat the inhomogeneous diffusion equation diffusion with prescribed boundary conditions in Lipschitz domains on these manifolds. As main application, we construct well localized diffusion wavelets on this class of cylinders and tori by means of multiperiodic eigensolutions to the parabolic Dirac operator. We round off with presenting some concrete numerical simulations for the three dimensional case. Copyright © 2010 John Wiley & Sons, Ltd.     

Multi‐periodic eigensolutions to the Dirac operator and applications to the generalized Helmholtz equation on flat cylinders and on the n‐torus

In this paper, we study the solutions to the generalized Helmholtz equation with complex parameter on some conformally flat cylinders and on the n‐torus. Using the Clifford algebra calculus, the solutions can be expressed as multi‐periodic eigensolutions to the Dirac operator associated with a complex parameter λ∈?. Physically, these can be interpreted as the solutions to the time‐harmonic Maxwell equations on these manifolds. We study their fundamental properties and give an explicit representation theorem of all these solutions and develop some integral representation formulas. In particular, we set up Green‐type formulas for the cylindrical and toroidal Helmholtz operator. As a concrete application, we explicitly solve the Dirichlet problem for the cylindrical Helmholtz operator on the half cylinder. Finally, we introduce hypercomplex integral operators on these manifolds, which allow us to represent the solutions to the inhomogeneous Helmholtz equation with given boundary data on cylinders and on the n‐torus. Copyright © 2009 John Wiley & Sons, Ltd.     

非线性分数阶微分方程三点边值问题解的存在性

讨论了一类非线性分数阶微分方程三点边值问题解的存在性.微分算子是Riemann-Liouville导算子并且非线性项依赖于低阶分数阶导数.通过将所考虑的问题转化为等价的Fredholm型积分方程,利用Schauder不动点定理获得该三点边值问题至少存在一个解.     

The Schr?dinger equation on cylinders and the n-torus

In this paper, we study the solutions to the Schr?dinger equation on some conformally flat cylinders and on the n-torus. First, we apply an appropriate regularization procedure. Using the Clifford algebra calculus with an appropriate Witt basis, the solutions can be expressed as multiperiodic eigensolutions to the regularized parabolic-type Dirac operator. We study their fundamental properties, give representation formulas of all these solutions in terms of multiperiodic generalizations of the elliptic functions in the context of the regularized parabolic-type Dirac operator. Furthermore, we also develop some integral representation formulas. In particular, we set up a Green type integral formula for the solutions to the homogeneous regularized Schr?dinger equation on cylinders and n-tori. Then, we treat the inhomogeneous Schr?dinger equation with prescribed boundary conditions in Lipschitz domains on these manifolds. We present an L _p -decomposition where one of the components is the kernel of the first-order differential operator that factorizes the cylindrical (resp. toroidal) Schr?dinger operator. Finally, we study the behavior of our results in the limit case where the regularization parameter tends to zero.     

On an inhomogeneous problem for parabolic-hyperbolic equation

We study a boundary value problem for an inhomogeneous parabolic-hyperbolic equation with a noncharacteristic type change line. Boundary conditions of the first kind are posed on characteristics in the parabolic and hyperbolic parts of the domain where the equation is given, and a condition of the third kind is posed on the noncharacteristic part of the boundary in the parabolic part. First, we study the solvability of an inhomogeneous initial–boundary value problem for a parabolic equation.     

Space-time Estimates for Parabolic Type Operator and Application to Nonlinear Parabolic Equations

In this present paper we establish space-time estimates of solutions for linear parabolic type equations based on classical multipliers theory or operator semigroup theory. According to space-time estimates we first construct suitable work space L^q(0, T; L^P), moreover we study the Cauchy problem and initial boundary value problem for semilinear parabolic equation in L^q(0, T; L^P) type space.     

A Variational Approach for the Mixed Problem in the Elastostatics of Bodies with Dipolar Structure

In this study, we address the mixed initial boundary value problem in the elastostatics of dipolar bodies. Using the equilibrium equations, we build the operator of dipolar elasticity and prove that this operator is positively defined even in the general case of an elastic inhomogeneous and anisotropic dipolar solid. This helps us to prove the existence of a generalized solution for first boundary value problem and also the uniqueness of the solution. Moreover, relying on this property of the operator of dipolar elasticity to be positively defined, we can apply the known variational method proposed by Mikhlin.     

一类Dirac方程特征值问题的迹恒等式

讨论了带有非局部边界条件的一维Dirac方程BdY/dx+P(x)Y=λY的特征值问题,其中首先建立了问题的特征值集合与一个整函数u(λ)零点集合的对应,并对Dirac算子的特征值进行了估计,然后借助于一个积分恒等式,采用留数方法,得到了该问题的特征值的迹恒等式.     

On an inverse scattering problem for a class of Dirac operators with spectral parameter in the boundary condition

In this work, we consider the inverse scattering problem for a class of one dimensional Dirac operators on the semi-infinite interval with the boundary condition depending polynomially on a spectral parameter. The scattering data of the given problem is defined and its properties are examined. The main equation is derived, its solvability is proved and it is shown that the potential is uniquely recovered in terms of the scattering data. A generalization of the Marchenko method is given for a class of Dirac operator.     

非自伴Dirac算子的迹公式

本文研究了非自伴Dirac算子的一般两点边值问题的渐近迹,首先运用平移算子得到了其Cauchy问题解的渐近式,并由此及边界条件,构造了整函数ω(λ),利用它将边界条件分为八种基本类型,最后采用留数的方法,得到了四种主要类型的特征值的渐近迹公式。