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2020年, 第40卷, 第2期　刊出日期：2020-04-25 上一期    下一期

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INFINITE SERIES FORMULAE RELATED TO GAUSS AND BAILEY $_2F_1(\tfrac12)$-SUMS 初文昌 数学物理学报(英文版). 2020 (2):  293-315.  DOI: 10.1007/s10473-020-0201-y 摘要 ( 69 )   RICH HTML PDF   收藏 The unified Ω-series of the Gauss and Bailey $_2F_1(\tfrac12)$-sums will be investigated by utilizing asymptotic methods and the modified Abel lemma on summation by parts. Several remarkable transformation theorems for the Ω-series will be proved whose particular cases turn out to be strange evaluations of nonterminating hypergeometric series and infinite series identities of Ramanujan-type, including a couple of beautiful expressions for π and the Catalan constant discovered by Guillera (2008). 参考文献 | 相关文章 | 计量指标

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MULTI-BUMP SOLUTIONS FOR NONLINEAR CHOQUARD EQUATION WITH POTENTIAL WELLS AND A GENERAL NONLINEARITY 郭伦, 胡亭曦 数学物理学报(英文版). 2020 (2):  316-340.  DOI: 10.1007/s10473-020-0202-x 摘要 ( 68 )   RICH HTML PDF   收藏 In this article, we study the existence and asymptotic behavior of multi-bump solutions for nonlinear Choquard equation with a general nonlinearity \begin{equation*} -\Delta u+(\lambda a(x)+1)u=\Big(\frac{1}{|x|^{\alpha}}\ast F(u)\Big)f(u) \ \ \text{in}\ \ \mathbb{R}^{N}, \end{equation*} where $N\geq 3$, $0<\alpha< \min\{N,4\}$, $\lambda$ is a positive parameter and the nonnegative potential function $a(x)$ is continuous. Using variational methods, we prove that if the potential well int$(a^{-1}(0))$ consists of $k$ disjoint components, then there exist at least $2^k-1$ multi-bump solutions. The asymptotic behavior of these solutions is also analyzed as $\lambda\to +\infty$. 参考文献 | 相关文章 | 计量指标

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ASYMPTOTIC BEHAVIOR OF SOLUTION BRANCHES OF NONLOCAL BOUNDARY VALUE PROBLEMS 徐西安, 秦宝侠, 王震 数学物理学报(英文版). 2020 (2):  341-354.  DOI: 10.1007/s10473-020-0203-9 摘要 ( 43 )   RICH HTML PDF   收藏 In this article, by employing an oscillatory condition on the nonlinear term, a result is proved for the existence of connected component of solutions set of a nonlocal boundary value problem, which bifurcates from infinity and asymptotically oscillates over an interval of parameter values. An interesting and immediate consequence of such oscillation property of the connected component is the existence of infinitely many solutions of the nonlinear problem for all parameter values in that interval. 参考文献 | 相关文章 | 计量指标

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ASYMPTOTIC DISTRIBUTION IN DIRECTED FINITE WEIGHTED RANDOM GRAPHS WITH AN INCREASING BI-DEGREE SEQUENCE 罗敬, 覃红, 汪政红 数学物理学报(英文版). 2020 (2):  355-368.  DOI: 10.1007/s10473-020-0204-8 摘要 ( 29 )   RICH HTML PDF   收藏 The asymptotic normality of the fixed number of the maximum likelihood estimators (MLEs) in the directed finite weighted network models with an increasing bi-degree sequence has been established recently. In this article, we further derive the central limit theorem for linear combinations of all the MLEs with an increasing dimension when the edges take finite discrete weight. Simulation studies are provided to illustrate the asymptotic results. 参考文献 | 相关文章 | 计量指标

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SOME METRIC AND TOPOLOGICAL PROPERTIES OF NEARLY STRONGLY AND NEARLY VERY CONVEX SPACES 张子厚, Vicente MONTESINOS, 刘春燕 数学物理学报(英文版). 2020 (2):  369-378.  DOI: 10.1007/s10473-020-0205-7 摘要 ( 43 )   RICH HTML PDF   收藏 We obtain characterizations of nearly strong convexity and nearly very convexity by using the dual concept of S and WS points, related to the so-called Rolewicz's property (α). We give a characterization of those points in terms of continuity properties of the identity mapping. The connection between these two geometric properties is established, and finally an application to approximative compactness is given. 参考文献 | 相关文章 | 计量指标

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ON THE EXISTENCE OF SOLUTIONS TO A BI-PLANAR MONGE-AMPÈRE EQUATION Ibrokhimbek AKRAMOV, Marcel OLIVER 数学物理学报(英文版). 2020 (2):  379-388.  DOI: 10.1007/s10473-020-0206-6 摘要 ( 36 )   RICH HTML PDF   收藏 In this article, we consider a fully nonlinear partial differential equation which can be expressed as a sum of two Monge-Ampère operators acting in different two-dimensional coordinate sections. This equation is elliptic, for example, in the class of convex functions. We show that the notion of Monge-Ampère measures and Aleksandrov generalized solutions extends to this equation, subject to a weaker notion of convexity which we call bi-planar convexity. While the equation is also elliptic in the class of bi-planar convex functions, the contrary is not necessarily true. This is a substantial difference compared to the classical Monge-Ampère equation where ellipticity and convexity coincide. We provide explicit counter-examples: classical solutions to the bi-planar equation that satisfy the ellipticity condition but are not generalized solutions in the sense introduced. We conclude that the concept of generalized solutions based on convexity arguments is not a natural setting for the bi-planar equation. 参考文献 | 相关文章 | 计量指标

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INFINITELY MANY SOLUTIONS WITH PEAKS FOR A FRACTIONAL SYSTEM IN $\mathbb{R}^{N}$ 何其涵, 彭艳芳 数学物理学报(英文版). 2020 (2):  389-411.  DOI: 10.1007/s10473-020-0207-5 摘要 ( 36 )   RICH HTML PDF   收藏 In this article, we consider the following coupled fractional nonlinear Schrödinger system in $\mathbb{R}^{N}$ \[\left\{ \begin{array}{l} {\left( { - \Delta } \right)^s}u + P\left( x \right)u = {\mu _1}{\left| u \right|^{2p - 2}}u + \beta {\left| u \right|^p}{\left| u \right|^{p - 2}}u,\;\;\;x \in {{\mathbb{R}}^N},\\{\left( { - \Delta } \right)^s}v + Q\left( x \right)v = {\mu _2}{\left| v \right|^{2p - 2}}v + \beta {\left| v \right|^p}{\left| v \right|^{p - 2}}v,\;\;\;\;\;x \in {{\mathbb{R}}^N},\\u,\;\;v \in {H^s}\left( {{{\mathbb{R}}^N}} \right),\end{array} \right.\] where $N≥2, 0 < s < 1, 1 < p < \frac{N}{N-2s},\mu_1>0, \mu_2>0$ and $\beta \in \mathbb{R}$ is a coupling constant. We prove that it has infinitely many non-radial positive solutions under some additional conditions on $P(x), Q(x), p$ and $\beta$. More precisely, we will show that for the attractive case, it has infinitely many non-radial positive synchronized vector solutions, and for the repulsive case, infinitely many non-radial positive segregated vector solutions can be found, where we assume that $P(x)$ and $Q(x)$ satisfy some algebraic decay at infinity. 参考文献 | 相关文章 | 计量指标

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APPROXIMATE CONTROLLABILITY RESULTS FOR INTEGRO-QUASILINEAR EVOLUTION EQUATIONS VIA TRAJECTORY REACHABLE SETS A. Vinodkumar, C. Loganathan, S. Vijay 数学物理学报(英文版). 2020 (2):  412-424.  DOI: 10.1007/s10473-020-0208-4 摘要 ( 34 )   RICH HTML PDF   收藏 In this article, we study the approximate controllability results for an integro-quasilinear evolution equation with random impulsive moments under sufficient conditions. The results are obtained by the theory of C0 semigroup of bounded linear operators on evolution equations and using trajectory reachable sets. Finally, we generalize the results too with and without fixed type impulsive moments. 参考文献 | 相关文章 | 计量指标

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ASYMPTOTIC BEHAVIOR OF SOLUTIONS FOR THE CHAFEE-INFANTE EQUATION 黄浩川, 黄锐 数学物理学报(英文版). 2020 (2):  425-441.  DOI: 10.1007/s10473-020-0209-3 摘要 ( 34 )   RICH HTML PDF   收藏 In higher dimension, there are many interesting and challenging problems about the dynamics of non-autonomous Chafee-Infante equation. This article is concerned with the asymptotic behavior of solutions for the non-autonomous Chafee-Infante equation $\frac{\partial u}{\partial t}- \Delta u =\lambda(t) (u -u^{3})$ in higher dimension, where $\lambda(t)\in C^{1}[0,T]$ and $\lambda(t)$ is a positive, periodic function. We denote $\lambda_{1}$ as the first eigenvalue of $ -\Delta \varphi = \lambda \varphi, \; x \in \Omega; \;\; \varphi=0, \; x \in \partial \Omega. $ For any spatial dimension $N\geq1$, we prove that if $\lambda(t)\leq\lambda_{1}$, then the nontrivial solutions converge to zero, namely, $\underset{t\rightarrow+\infty }{\lim} u(x,t) =0, \; x\in\Omega$; if $\lambda(t)>\lambda_{1}$ as $t\rightarrow +\infty$, then the positive solutions are ``attracted'' by positive periodic solutions. Specially, if $\lambda(t)$ is independent of $t$, then the positive solutions converge to positive solutions of $- \Delta U =\lambda(U -U^{3})$. Furthermore, numerical simulations are presented to verify our results. 参考文献 | 相关文章 | 计量指标

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LOCAL WELL-POSEDNESS OF STRONG SOLUTIONS FOR THE NONHOMOGENEOUS MHD EQUATIONS WITH A SLIP BOUNDARY CONDITIONS 李红民, 肖跃龙 数学物理学报(英文版). 2020 (2):  442-456.  DOI: 10.1007/s10473-020-0210-x 摘要 ( 38 )   RICH HTML PDF   收藏 This article is concerned with the 3D nonhomogeneous incompressible magnetohydrodynamics equations with a slip boundary conditions in bounded domain. We obtain weighted estimates of the velocity and magnetic field, and address the issue of local existence and uniqueness of strong solutions with the weaker initial data which contains vacuum states. 参考文献 | 相关文章 | 计量指标

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$L^0$-CONVEX COMPACTNESS AND RANDOM NORMAL STRUCTURE IN $L^0(\mathcal{F},B)$ 郭铁信, 张二鑫, 王亚超, 袁先智 数学物理学报(英文版). 2020 (2):  457-469.  DOI: 10.1007/s10473-020-0211-9 摘要 ( 29 )   RICH HTML PDF   收藏 Let $(B,\|\cdot\|)$ be a Banach space, $(\Omega,\mathcal{F},P)$ a probability space, and $L^0(\mathcal{F},B)$ the set of equivalence classes of strong random elements (or strongly measurable functions) from $(\Omega,\mathcal{F},P)$ to $(B,\|\cdot\|)$. It is well known that $L^0(\mathcal{F},B)$ becomes a complete random normed module, which has played an important role in the process of applications of random normed modules to the theory of Lebesgue-Bochner function spaces and random operator theory. Let $V$ be a closed convex subset of $B$ and $L^0(\mathcal{F},V)$ the set of equivalence classes of strong random elements from $(\Omega,\mathcal{F},P)$ to $V$. The central purpose of this article is to prove the following two results: (1) $L^0(\mathcal{F},V)$ is $L^0$-convexly compact if and only if $V$ is weakly compact; (2) $L^0(\mathcal{F},V)$ has random normal structure if $V$ is weakly compact and has normal structure. As an application, a general random fixed point theorem for a strong random nonexpansive operator is given, which generalizes and improves several well known results. We hope that our new method, namely skillfully combining measurable selection theorems, the theory of random normed modules, and Banach space techniques, can be applied in the other related aspects. 参考文献 | 相关文章 | 计量指标

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STABILIZATION EFFECT OF FRICTIONS FOR TRANSONIC SHOCKS IN STEADY COMPRESSIBLE EULER FLOWS PASSING THREE-DIMENSIONAL DUCTS 袁海荣, 赵勤 数学物理学报(英文版). 2020 (2):  470-502.  DOI: 10.1007/s10473-020-0212-8 摘要 ( 33 )   RICH HTML PDF   收藏 Transonic shocks play a pivotal role in designation of supersonic inlets and ramjets. For the three-dimensional steady non-isentropic compressible Euler system with frictions, we constructe a family of transonic shock solutions in rectilinear ducts with square cross-sections. In this article, we are devoted to proving rigorously that a large class of these transonic shock solutions are stable, under multidimensional small perturbations of the upcoming supersonic flows and back pressures at the exits of ducts in suitable function spaces. This manifests that frictions have a stabilization effect on transonic shocks in ducts, in consideration of previous works which shown that transonic shocks in purely steady Euler flows are not stable in such ducts. Except its implications to applications, because frictions lead to a stronger coupling between the elliptic and hyperbolic parts of the three-dimensional steady subsonic Euler system, we develop the framework established in previous works to study more complex and interesting Venttsel problems of nonlocal elliptic equations. 参考文献 | 相关文章 | 计量指标

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ON THE AREAS OF THE MINIMAL TRIANGLES IN VEECH SURFACES 钟裕民 数学物理学报(英文版). 2020 (2):  503-514.  DOI: 10.1007/s10473-020-0213-7 摘要 ( 28 )   RICH HTML PDF   收藏 Smillie and Weiss proved that the set of the areas of the minimal triangles of Veech surfaces with area 1 can be arranged as a strictly decreasing sequence $\{a_n\}$. And each $a_n$ in the sequence corresponds to finitely many affine equivalent classes of Veech surfaces with area 1. In this article, we give an algorithm for calculating the area of the minimal triangles in a Veech surface and prove that the first element of $\{a_n\}$ which corresponds to non arithmetic Veech surfaces is $(5-\sqrt{5})/20$, which is uniquely realized by the area of the minimal triangles of the normalized golden $L$-shaped translation surface up to affine equivalence. 参考文献 | 相关文章 | 计量指标

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STRONG INSTABILITY OF STANDING WAVES FOR A SYSTEM NLS WITH QUADRATIC INTERACTION Van Duong DINH 数学物理学报(英文版). 2020 (2):  515-528.  DOI: 10.1007/s10473-020-0214-6 摘要 ( 23 )   RICH HTML PDF   收藏 We study the strong instability of standing waves for a system of nonlinear Schrödinger equations with quadratic interaction under the mass resonance condition in dimension d=5. 参考文献 | 相关文章 | 计量指标

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INITIAL BOUNDARY VALUE PROBLEM FOR THE 3D MAGNETIC-CURVATURE-DRIVEN RAYLEIGH-TAYLOR MODEL 蒲学科, 郭柏灵 数学物理学报(英文版). 2020 (2):  529-542.  DOI: 10.1007/s10473-020-0215-5 摘要 ( 26 )   RICH HTML PDF   收藏 This article studies the initial-boundary value problem for a three dimensional magnetic-curvature-driven Rayleigh-Taylor model. We first obtain the global existence of weak solutions for the full model equation by employing the Galerkin's approximation method. Secondly, for a slightly simplified model, we show the existence and uniqueness of global strong solutions via the Banach's fixed point theorem and vanishing viscosity method. 参考文献 | 相关文章 | 计量指标

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MAXIMUM TEST FOR A SEQUENCE OF QUADRATIC FORM STATISTICS ABOUT SCORE TEST IN LOGISTIC REGRESSION MODEL 杨青, 朱家砚, 李正帮 数学物理学报(英文版). 2020 (2):  543-556.  DOI: 10.1007/s10473-020-0216-4 摘要 ( 22 )   RICH HTML PDF   收藏 This article proposes the maximum test for a sequence of quadratic form statistics about score test in logistic regression model which can be applied to genetic and medicine fields. Theoretical properties about the maximum test are derived. Extensive simulation studies are conducted to testify powers robustness of the maximum test compared to other two existed test. We also apply the maximum test to a real dataset about multiple gene variables association analysis. 参考文献 | 相关文章 | 计量指标

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PROPERTIES ON MEROMORPHIC SOLUTIONS OF COMPOSITE FUNCTIONAL-DIFFERENTIAL EQUATIONS 刘曼莉, 高凌云 数学物理学报(英文版). 2020 (2):  557-571.  DOI: 10.1007/s10473-020-0217-3 摘要 ( 36 )   RICH HTML PDF   收藏 With the aid of Nevanlinna value distribution theory, differential equation theory and difference equation theory, we estimate the non-integrated counting function of meromorphic solutions on composite functional-differential equations under proper conditions.We also get the form of meromorphic solutions on a type of system of composite functional equations. Examples are constructed to show that our results are accurate. 参考文献 | 相关文章 | 计量指标

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EXPANDABLE PARALLEL FINITE ELEMENT METHODS FOR LINEAR ELLIPTIC PROBLEMS 杜光芝 数学物理学报(英文版). 2020 (2):  572-588.  DOI: 10.1007/s10473-020-0218-2 摘要 ( 38 )   RICH HTML PDF   收藏 In this article, two kinds of expandable parallel finite element methods, based on two-grid discretizations, are given to solve the linear elliptic problems. Compared with the classical local and parallel finite element methods, there are two attractive features of the methods shown in this article: 1) a partition of unity is used to generate a series of local and independent subproblems to guarantee the final approximation globally continuous; 2) the computational domain of each local subproblem is contained in a ball with radius of $O(H)$ ($H$ is the coarse mesh parameter), which means methods in this article are more suitable for parallel computing in a large parallel computer system. Some a priori error estimation are obtained and optimal error bounds in both $H^1$-normal and $L^2$-normal are derived. Finally, numerical results are reported to test and verify the feasibility and validity of our methods. 参考文献 | 相关文章 | 计量指标

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ULAM-HYERS-RASSIAS STABILITY AND EXISTENCE OF SOLUTIONS TO NONLINEAR FRACTIONAL DIFFERENCE EQUATIONS WITH MULTIPOINT SUMMATION BOUNDARY CONDITION Syed Sabyel HAIDER, Mujeeb Ur REHMAN 数学物理学报(英文版). 2020 (2):  589-602.  DOI: 10.1007/s10473-020-0219-1 摘要 ( 34 )   RICH HTML PDF   收藏 The purpose of this study is to acquire some conditions that reveal existence and stability for solutions to a class of difference equations with non-integer order μ∈ (1, 2]. The required conditions are obtained by applying the technique of contraction principle for uniqueness and Schauder's fixed point theorem for existence. Also, we establish some conditions under which the solution of the considered class of difference equations is generalized Ulam-Hyers-Rassias stable. Example for the illustration of results is given. 参考文献 | 相关文章 | 计量指标