Nguyen Thanh Chung, Ky Ho
We establish a concentration-compactness principle for the Sobolev space $W^{2,p(\cdot)}(Ω)\cap W_0^{1,p(\cdot)}(Ω)$ that is a tool for overcoming the lack of compactness of the critical Sobolev imbedding. Using this result we obtain several existence and multiplicity results for a class of Kirchhoff type problems involving $p(\cdot)$-biharmonic operator and critical growth.
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Infinitely many solutions for a biharmonic-Kirchhoff system on locally finite graphs
针对局部有限图上的双调和-Kirchhoff系统，通过变分法结合对称山路引理，证明当非线性项满足超4次线性增长时存在无穷多解，且结果优于欧几里得环境下的对应系统。
$p$-biharmonic Kirchhoff equations with critical Choquard nonlinearity
本文研究含临界 Choquard 非线性的 $p$-双调和 Kirchhoff 方程，通过建立集中紧性原理并结合变分法，证明不同 $r$ 下解关于参数 $λ$、$α$ 的存在性与多重性。
In this article we study the existence of weak solution, existence of ground state solution using Nehari manifold and existence of infinitely many solutions using Fountain theorem and Dual fountain theorem for a class of doubly nonlocal Kirchhoff-Choquard type equations involving the variable-order fractional $p(\cdot)-$ Laplacian operator. Here the nonlinearity does not satisfy the well known Ambrosetti-Rabinowitz type condition.
Well-posedness for the biharmonic scattering problem for a penetrable obstacle
本文研究了可渗透障碍物在弹性板中的双调和波散射问题，通过算子分解方法分析了适定性及互易关系，并通过数值示例验证了理论结果。
Analysis of the transmission eigenvalue problem for biharmonic scattering considering penetrable scatterers
本文针对可穿透障碍物的双调和散射问题，分析透射特征值的存在性、离散性及对折射率的依赖，证明首个特征值的单调性，并通过数值实验验证理论结果。
A degenerate Kirchhoff-type problem involving variable $s(\cdot)$-order fractional $p(\cdot)$-Laplacian with weights
本文针对含权的非局部变阶分数阶 $p(\cdot)$-Kirchhoff 方程，在适当结构条件下证明非平凡解的存在性与多重性，并将结论推广至退化情形。
We are interested in the existence of solutions for the following fractional $p(x,\cdot)$-Kirchhoff type problem $$ \left\{\begin{array}{ll} M \, \left(\displaystyle\int_{Ω\times Ω} \ \displaystyle{\frac{|u(x)-u(y)|^{p(x,y)}}{p(x,y) \ |x-y|^{N+p(x,y)s}}} \ dx \, dy\right)(-Δ)^{s}_{p(x,\cdot)}u = f(x,u), \quad x\in Ω, \\ \\ u= 0, \quad x\in \partialΩ, \end{array}\right.$$ where $Ω\subset\mathbb{R}^{N}$, $N\geq 2$ is a bounded smooth domain, $s\in(0,1),$ $p: \overlineΩ\times \overlineΩ \rightarrow (1, \infty)$, $(-Δ)^{s}_{p(x,\cdot)}$ denotes the $p(x,\cdot)$-fractional Laplace operator, $M: [0,…
Factorization method for the biharmonic scattering problem for an absorbing penetrable scatterer
本文将因子分解方法拓展至薄弹性板中吸收性可穿透散射体的逆散射问题，基于双调和波动方程严格证明该方法的合理性，提供二元判据区分采样点位置，并数值分析弱散射体Born近似的有效性。
Infinitely many solutions for doubly critical variable-order $p(x)$-Choquard-Kirchhoff type equations via the concentration compactness method
本文研究变光滑度双临界Choquard-Kirchhoff型方程，通过建立新的Sobolev嵌入定理、推广集中紧性引理，结合基于Krasnoselskii亏格的临界点定理，证明了该方程无穷多解的存在性。
On Kirchhoff-type p(.)-Laplacian problems with sandwich-type and arbitrary growth
针对具有任意增长和夹层型增长的Kirchhoff型p(·)-Laplacian问题，通过截断论证和先验估计，证明了正有界弱解的存在性。
The study of fourth order partial differential equations has flourished in the last years, however, a $p(\cdot)$-biharmonic problem with no-flux boundary condition has never been considered before, not even for constant $p$. This is an important step further, since surfaces that are impermeable to some contaminants are appearing quite often in nature, hence the significance of such boundary condition. By relying on several variational arguments, we obtain the existence and the multiplicity of weak solutions to our problem. We point out that, although we use a mountain pass type theorem in orde…
\noi In this article, we study the existence of non-negative solutions of the following polyharmonic Kirchhoff type problem with critical singular exponential nolinearity $$ \quad \left\{ \begin{array}{lr} \quad -M\left(\displaystyle\int_Ω|\nabla^m u|^{\frac{n}{m}}dx\right)Δ_{\frac{n}{m}}^{m} u = \frac{f(x,u)}{|x|^α} \; \text{in}\; \Om{,} \quad \quad u = \nabla u=\cdot\cdot\cdot= {\nabla}^{m-1} u=0 \quad \text{on} \quad \partial \Om{,} \end{array} \right. $$ where $\Om\subset \mb R^n$ is a bounded domain with smooth boundary, $n\geq 2m\geq 2$ and $f(x,u)$ behaves like $e^{|u|^{\frac{n}{n-m}}}$…
The aim of this paper is to study the multiplicity of solutions for the following Kirchhoff type elliptic systems \begin{eqnarray*} \left\{ \arraycolsep=1.5pt \begin{array}{ll} -m\left(\sum^k_{j=1}\|u_j\|^2\right)Δu_i=\frac{f_i(x,u_1,\ldots,u_k)}{|x|^β}+\varepsilon h_i(x),\ \ & \mbox{in}\ \ Ω, \ \ i=1,\ldots,k ,\\[2mm] u_1=u_2=\cdots=u_k=0,\ \ & \mbox{on}\ \ \partialΩ, \end{array} \right. \end{eqnarray*} where $Ω$ is a bounded domain in $\mathbb{R}^2$ containing the origin with smooth boundary, $β\in [0,2)$, $m$ is a Kirchhoff type function, $\|u_j\|^2=\int_Ω|\nabla u_j|^2dx$, $f_i$ behaves li…
We consider an operator $Δ^2 + A(x)\cdot D+q(x)$ with the Navier boundary conditions on a bounded domain in $R^n$, $n\ge 3$. We show that a first order perturbation $A(x)\cdot D+q$ can be determined uniquely by measuring the Dirichlet--to--Neumann map on possibly very small subsets of the boundary of the domain. Notice that the corresponding result does not hold in general for a first order perturbation of the Laplacian.
We establish a continuous embedding $W^{s(\cdot),2}(Ω)\hookrightarrow L^{α(\cdot)}(Ω)$, where the variable exponent $α(x)$ can be close to the critical exponent $2_{s}^*(x)=\frac{2N}{N-2\bar{s}(x)}$, with $\bar{s}(x)=s(x,x)$ for all $x\in\barΩ$. Subsequently, this continuous embedding is used to prove the multiplicity of solutions for critical nonlocal degenerate Kirchhoff problems with a variable singular exponent. Moreover, we also obtain the uniform $L^{\infty}$-estimate of these infinite solutions by a bootstrap argument.
Nehari-type ground state solutions for asymptotically periodic bi-harmonic Kirchhoff-type problems in $\mathbb{R}^N$
本文研究了 $\mathbb{R}^N$ 中渐近周期双调和 Kirchhoff 型方程的 Nehari 型基态解存在性，在 $f(x,u)u-4F(x,u)$ 变号条件下，显著扩展了先前文献的结果。
The higher order Kirchhoff type equation $$\int_{\mathbb{R}^{2m}}(|\nabla^m u|^2 +\sum_{γ=0}^{m-1}a_γ(x)|\nabla^γu|^2)dx \left((-Δ)^m u+\sum_{γ=0}^{m-1}(-1)^γ\nabla^γ\cdot(a_γ(x)\nabla^γu)\right) =\frac{f(x,u)}{|x|^β}+εh(x)\ \ \text{in}\ \ \mathbb{R}^{2m}$$ is considered in this paper. We assume that the nonlinearity of the equation has exponential critical growth and prove that, for a positive $ε$ which is small enough, there are two distinct nontrivial solutions to the equation. When $ε=0$, we also prove that the equation has a nontrivial mountain-pass type solution.
Existence of transmission eigenvalues for biharmonic scattering by a clamped planar region
本文研究了薄弹性板上不可穿透夹紧障碍物的双曲散射问题，证明了存在无限多个实传输特征值，并探讨了其与狄利克雷和诺伊曼特征值的关系。
The inverse fixed angle problem for operator $Δ^2 u + V(x,|u|) u$ is considered in dimensions $n=2,3$. We prove that the difference between an inverse fixed angle Born approximation and the function $V(\cdot,1)$ is smoother than the function $V$ itself in some Sobolev scale. This allows us to conclude that the main singularities of the perturbation $V$ can be reconstructed from the knowledge of the scattering amplitude with some fixed incident angle.
On biharmonic equations with $p$-Laplacian and indefinite potentials or critical nonlinearity
本文针对具p-拉普拉斯算子与不定势或临界非线性项的双调和方程，利用局部环绕和莫尔斯理论得到非平凡解，对奇非线性项得大能量解，对有界正势与临界/次临界指数非线性项得多个解。
This paper deals with the following degenerate fractional Kirchhoff-type system with magnetic fields and critical growth: $$ \left\{ \begin{array}{lll} -\mathfrak{M}(\|u\|_{s,A}^2)[(-Δ)^s_Au+u] = G_u(|x|,|u|^2,|v|^2) + \left(\mathcal{I}_μ*|u|^{p^*}\right)|u|^{p^*-2}u \ &\mbox{in}\,\,\mathbb{R}^N,\\ \mathfrak{M}(\|v\|_{s,A})[(-Δ)^s_Av+v] = G_v(|x|,|u|^2,|v|^2) + \left(\mathcal{I}_μ*|v|^{p^*}\right)|v|^{p^*-2}v \ &\mbox{in}\,\,\mathbb{R}^N, \end{array}\right. $$ where $$\|u\|_{s,A}=\left(\iint_{\mathbb{R}^{2N}}\frac{|u(x)-e^{i(x-y)\cdot A(\frac{x+y}{2})}u(y)|^2}{|x-y|^{N+2s}}dx dy+\int_{\mathbb{…
Motived by the heat flow and bubble analysis of biharmonic mappings, we study further regularity issues of the fourth order Lamm-Riviere system $$Δ^{2}u=Δ(V\cdot\nabla u)+{\rm div}(w\nabla u)+(\nablaω+F)\cdot\nabla u+f$$ in dimension four, with an inhomogeneous term $f$ which belongs to some natural function space. We obtain optimal higher order regularity and sharp Holder continuity of weak solutions. Among several applications, we derive weak compactness for sequences of weak solutions with uniformly bounded energy, which generalizes the weak convergence theory of approximate biharmonic mapp…
$L^p$-regularity for fourth order elliptic systems with antisymmetric potentials in higher dimensions
本文建立了所有超临界维数下带反对称势的四阶椭圆系统的最优$L^p$-正则性理论，改进了Struwe的Hölder正则性定理，并扩展了调和映射的$L^p$-正则性理论。
A nonstandard higher-order variational model to speckle noise removal and thin-structure detection
本文提出一种基于p(·)-Kirchhoff能量的非标准高阶PDE多尺度方法，通过拓扑梯度方法检测图像重要对象，并利用自适应选择的变量指数函数保持图像特征，结合分裂Bregman方法进行数值实现，对比传统变分方法验证了其有效性。
Degenerate Kirchhoff problems with nonlinear Neumann boundary condition
针对带非线性Neumann边界的退化Kirchhoff型方程，本文基于变分方法在非局部约束集上极小化能量泛函，证明了节点基态解的存在性。
Least energy sign-changing solution for degenerate Kirchhoff double phase problems
本文针对含退化 Kirchhoff 系数的双相非局部 Dirichlet 问题，利用变分法、定量形变引理与 Poincaré–Miranda 定理，证明正、负定号解及最小能量变号解的存在性。
A new class of multiple nonlocal problems with two parameters and variable-order fractional $p(\cdot)$-Laplacian
本文研究了一类涉及变阶p(x)-分数阶Laplacian的新型三重非局部Kirchhoff问题，结合变分法及Fountain定理与对称山路定理，分别在两种参数条件下证明了该问题解的存在性与多重性。
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