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26 April 2023, Volume 43 Issue 2 Previous Issue    Next Issue

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Locally Minimizing Solutions of a Two-component Ginzburg-Landau System Xiong Chen, Gao Qi Acta mathematica scientia,Series A. 2023, 43 (2):  321-340.  Abstract ( 181 )   RICH HTML PDF (446KB) ( 449 )   Save In this paper, we consider a Ginzburg-Landau functional for a complex vector order parameter $\Psi=[\psi_+, \psi_-]$. In particular, we consider entire solutions in all ${\Bbb R}^2$, which are obtained by blowing up around vortices. Among the entire solutions we distinguish those which are locally minimizing solutions, and we show that locally minimizing solutions must have degrees $n_\pm \in \{0, \pm1\}$. By studying the local structure of these solutions, we also show that one component of the solution vanishes, but the other does not, which describes the coreless vortex phenomenon in physics. References | Related Articles | Metrics

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Asymptotically Almost Periodic Solutions for Stochastic Differential Equations in Infinite Dimensions Chen Yejun, Ding Huisheng Acta mathematica scientia,Series A. 2023, 43 (2):  341-354.  Abstract ( 135 )   RICH HTML PDF (401KB) ( 191 )   Save In this paper, we introduce the notion of asymptotically $\theta$-almost periodic stochastic process and study a class of stochastic differential matrixs in infinite dimensions with asymptotically almost periodic coefficients under the framework of operator semigroup theory. Using stochastic analysis theory, the existence of asymptotically $\theta$-almost periodic solutions of these matrixs is established. In addition, the concept of asymptotically almost periodic process in path distribution is introduced, and we prove that the above solutions are also asymptotically almost periodic in path distribution. It is noteworthy that all the earlier related results only give the existence of asymptotically almost periodic solutions in one-dimensional distribution, which are weaker than asymptotically almost periodic solutions in path distribution. References | Related Articles | Metrics

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Stability of Piezoelectric Beams with Magnetic Effects of Fractional Derivative Type and with/without Thermal Effects An Yanning, Liu Wenjun, Kong Aowen Acta mathematica scientia,Series A. 2023, 43 (2):  355-376.  Abstract ( 65 )   RICH HTML PDF (483KB) ( 123 )   Save In this paper, we consider the well-posedness and asymptotic behavior of a one-dimensional piezoelectric beam system with control boundary conditions of fractional derivative type, which represent magnetic effects on the system. By introducing two new matrixs to deal with control boundary conditions of fractional derivative type, we obtain a new equivalent system, so as to show the well-posedness of the system by using Lumer-Philips theorem. We then prove the lack of exponential stability by a spectral analysis, and obtain the polynomial stability of the system without thermal effects by using a result of Borichev and Tomilov (Math. Ann. 347 (2010), 455-478). To find a more stable system, we then consider the stability of the above system with thermal effects described by Fourier's law, and achieve the exponential stability for the system by using the perturbed functional method. References | Related Articles | Metrics

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Identification of Initial Values of Space-Time Fractional Diffusion-Wave Equation Yang Fan, Cao Ying, Li Xiaoxiao Acta mathematica scientia,Series A. 2023, 43 (2):  377-398.  Abstract ( 63 )   RICH HTML PDF (660KB) ( 103 )   Save In this paper, we study the identification of unknown initial values of time-space fractional diffusion-wave matrix. Firstly, we prove that the problem is ill-posed and give the conditional stability result. Then, we use Tikhonov regularization method to restore the stability of the solutions, and give the convergence error estimates under a priori regularization parameter selection rule and a posteriori regularization parameter selection rule. Finally, numerical examples show that the regularization method is effective. Figures and Tables | References | Related Articles | Metrics

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Long-Wavelength Limit for the Two-Fluid Euler-Poisson Equation Li Min, Pu Xueke Acta mathematica scientia,Series A. 2023, 43 (2):  399-420.  Abstract ( 76 )   RICH HTML PDF (458KB) ( 108 )   Save In this paper, we justify rigorously the long-wavelength limit for the two-fluid Euler-Poisson matrix. Firstly, under a long wave scaling, we establish the formal derivation of the Korteweg-de Vries (KdV) matrix from the two-fluid Euler-Poisson matrix by using a singular perturbation method. Then, with the aid of deep analysis of the complicated coupling structure of the two-fluid Euler-Poisson system and delicate energy estimates depending on such a structure, we prove the convergence of solutions of the Euler-Poisson system to that of the KdV matrix mathematically rigorously when $m_{i}/m_{e}\neq T_{i}/T_{e}$ in a time interval on which the KdV dynamics can be seen. References | Related Articles | Metrics

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Approximate Controllability for a Class of Second-Order Evolution Equations with Instantaneous Impulse Kang Xiaodong, Fan Hongxia Acta mathematica scientia,Series A. 2023, 43 (2):  421-432.  Abstract ( 56 )   RICH HTML PDF (381KB) ( 94 )   Save In this paper, we study the approximate controllability for a class of second-order neutral evolution matrixs with infinite delay and instantaneous pulses in Hilbert spaces. The representation of mild solution of this matrix is obtained by using the cosine family theory, and combined with Schauder fixed point theorem, the existence conclusion of mild solution is obtained. By constructing an appropriate control function and using the resolvent operator type condition, the sufficient condition for the approximate controllability of this matrix is acquired. Finally, an example is given to illustrate the application of the main conclusions. References | Related Articles | Metrics

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Existence and Multiplicity of Radial Solutions for Double Phase Problem on the Entire Space $\mathbb{R} ^N$ Ge Bin, Yuan Wenshuo Acta mathematica scientia,Series A. 2023, 43 (2):  433-446.  Abstract ( 82 )   RICH HTML PDF (401KB) ( 109 )   Save This study is concerned with the following double phase problem $\begin{array}{ll}-{\rm div}(|\nabla u|^{p-2}\nabla u+\mu(x)|\nabla u|^{q-2}\nabla u) +|u|^{p-2}u+\mu(x)|u|^{q-2}u =\lambda f(x,u),\;x\in \mathbb{R} ^N, &\\ \end{array}$ where 1 < p < q < N, $\frac{q}{p}\leq 1+\frac{\alpha}{N}$, $\lambda$ is a real parameter, $0\leq\mu\in C^{0,\alpha}(\mathbb{R} ^N)$ with $\alpha\in(0,1]$ and $f: \mathbb{R} ^N\times\mathbb{R} \rightarrow \mathbb{R}$ satisfies a Carathéodory condition. The aim is to determine the precise positive interval of $\lambda$ for which the problem admits at least one or two nontrivial radially symmetric solutions by applying abstract critical point results. References | Related Articles | Metrics

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Variational Approach to Existence of Multiple Solutions for Neumann Boundary Value Problem of Impulsive Differential Equations Liao Dan, Zhang Huiping, Yao Wangjin Acta mathematica scientia,Series A. 2023, 43 (2):  447-457.  Abstract ( 84 )   RICH HTML PDF (377KB) ( 96 )   Save In this paper, we consider the multiplicity of solutions for Neumann boundary value problem of impulsive differential matrixs with $p$-Laplacian operator. Under the assumption that the nonlinearity does not satisfy Ambrosetti-Rabinowitz condition, infinitely many classical solutions for the impulsive boundary value problem are obtained via variational method. References | Related Articles | Metrics

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Global Existence of the Compressible and Radiative Flux with Temperature-Dependent Transport Coefficients Zhang Mingyu Acta mathematica scientia,Series A. 2023, 43 (2):  458-480.  Abstract ( 71 )   RICH HTML PDF (398KB) ( 110 )   Save In this paper, we are concerned with the the global existence and non-linear stability of the compressible and radiative Navier-Stokes matrixs when the viscosity $\lambda$ and heat conductivity $\kappa$ depend on temperature $\theta$, i.e., $\lambda(\theta)=\theta^\alpha$, $\kappa(\theta)=1+\theta^\beta$ with $\alpha \in [0, +\infty)$, $\beta \in (2, +\infty)$. The global existence and uniqueness of strong solutions are obtained under the assumptions on the parameter $\alpha$ and initial data. In addition, we also proved the non-linear exponential stability of the solutions on the basis of the fundamental uniform-in-time estimates. It should be note that the initial data could be large if $\alpha$ is small and the growth exponent $\beta$ can be arbitrarily large. References | Related Articles | Metrics

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Formation of Singularities in Solutions to Spherically Symmetric Relativistic Euler Equations for a Chaplygin Gas Shi Yingchun, Lai Geng Acta mathematica scientia,Series A. 2023, 43 (2):  481-490.  Abstract ( 67 )   RICH HTML PDF (330KB) ( 105 )   Save This paper studies the formation of singularities in smooth solutions to three-dimensional (3D) spherically symmetric relativistic Euler matrixs with a Chaplygin gas matrix of state. We give a sufficient condition on the initial data to obtain that the mass-energy density itself of the classical solutions to the Cauchy problem blows up in finite time. References | Related Articles | Metrics

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Well-Balanced Preserving of Entropy Stable Schemes for Shallow Water Equations Jian Mangmang, Zheng Supei, Feng Jianhu, Zhai Mengqing Acta mathematica scientia,Series A. 2023, 43 (2):  491-504.  Abstract ( 72 )   RICH HTML PDF (971KB) ( 96 )   Save Preserving well-balanced property is an important property for shallow water matrixs. The schemes with this property can capture small perturbations of steady state accurately in theory. For the shallow water matrixs with source terms, the first step is to construct an appropriate numerical dissipative operator and select a special discretization of source terms to accurately balance the non-zero flux and source terms, which is to obtain a class of high order well-balanced entropy stable schemes to keep balance. The new idea is to put forward the well-balanced preserving theorems for the high-order entropy conservative schemes and for the high-order entropy stable schemes. The detail proof process is also clearly given. Finally, several typical numerical examples show that new schemes can well deal with the small perturbation problems of steady-state solutions. Figures and Tables | References | Related Articles | Metrics

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Phragmén-Lindelöf Type Results for the Solutions of Forchheimer Equations on a Semi-Infinite Cylinder Chen Xuejiao, Li Yuanfei, Hou Chunjuan Acta mathematica scientia,Series A. 2023, 43 (2):  505-514.  Abstract ( 59 )   RICH HTML PDF (369KB) ( 79 )   Save The Forchheimer fluid defined in porous media on a three-dimensional semi-infinite cylinder is considered. An energy function is established, and a differential inequality about the energy function is derived. From the inequality, an alternative result of the solutions is obtained. In the case of decay, the fast decay rate of the solutions is obtained by setting a positive parameter. References | Related Articles | Metrics

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Optimal Control for a Class of Nonlinear Evolutionary Equations with Weakly Continuous Operators Zeng Biao Acta mathematica scientia,Series A. 2023, 43 (2):  515-530.  Abstract ( 61 )   RICH HTML PDF (419KB) ( 95 )   Save In the paper we study an optimal control problem for a class of nonlinear evolutionary matrixs involving weakly continuous operators. By exploiting the Rothe method and using a surjectivity result for weakly continuous operators, we establish the solvability for the matrix. Then we show the existence of optimal state-control pairs for the optimal control problem. The main results are applied to non-stationary Navier-Stokes-Voigt matrix. References | Related Articles | Metrics

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Backward $W$-compact Mean Dynamics for Stochastic ${g}$-Navier-Stokes Equations with Nonlinear Noise Li Yangrong, Wang Fengling, Yang Shuang Acta mathematica scientia,Series A. 2023, 43 (2):  531-548.  Abstract ( 49 )   RICH HTML PDF (480KB) ( 102 )   Save We study the mean dynamics for the stochastic 2D $g$-Navier-Stokes matrix driven by infinitely dimensional cylindrical noise with a nonlinear diffusion term and a time-dependent external force. We first obtain a mean random dynamical system if the nonlinear diffusion term is Lipschtz continuous and the force is locally integrable. We then show that the mean RDS possesses a unique mean pullback weak attractor in the Bochner space of even power if the force is also tempered. Moreover, by using the monotonicity of Bochner spaces with respect to the time, we show that the backward union of the mean pullback w-attractor is well-defined and weakly compact in progressive Bochner spaces if the force is backward tempered. We finally provide three examples of backward $w$-compact $w$-attractors when the force is null, periodic or increasing, respectively. References | Related Articles | Metrics

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Sliding Mode Control for Time-Varying Delay Systems with Semi-Markov Jump Fu Qinhong, Xiong Lianglin, Zhang Haiyang, Qin Ya, Quan Shenai Acta mathematica scientia,Series A. 2023, 43 (2):  549-562.  Abstract ( 81 )   RICH HTML PDF (780KB) ( 105 )   Save This paper studies the sliding mode controller design problem for uncertain continuous time-varying delay systems with the semi-Markov jump. Firstly, by studying the dynamic characteristics of the system, combined with the sliding mode surface, a singular system is established to describe the holonomic dynamics of the sliding mode. Then, building an appropriate Lyapunov functional by taking into account more information about time delay, a sufficient condition that guarantees the existence of sliding mode surface and the stochastic stability of sliding mode dynamics is given. Based on this, a sliding mode controller is designed to make the closed-loop system finally converge to the sliding mode surface. Finally, a numerical example is given to show the effectiveness of the developed approach. Figures and Tables | References | Related Articles | Metrics

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Unextendible Product Bases of Mixed Quantum States in Higher Dimensional Systems Han Qi, Han Yanan, Bai Ning, Kou Yaxin Acta mathematica scientia,Series A. 2023, 43 (2):  563-569.  Abstract ( 52 )   RICH HTML PDF (356KB) ( 100 )   Save In the context of quantum information theory, the positive mapping St?rmer-Woronowicz feature is only applicable to low dimensions, the positive partial transposition (PPT) of the mixed quantum state does not form a necessary and sufficient condition for separability in a higher dimensional Hilbert space, so PPT entanglement states exists. Bound entanglement is a weak form of quantum entanglement. It cannot purify any entanglement under local operation and classical communication, which means that not all entanglement can be directly applied to quantum communication. How to characterize bound entanglement states is one of the key problems in quantum information. Bound entanglement states can be constructed by means of an unexpandable product basis. In this paper, we give a constructon of unextensible product basis for mixed quantum states in high dimensional systems, and give the rule of the number of basis vectors in this basis. References | Related Articles | Metrics

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Two Extended HS-type Conjugate Gradient Methods with Restart Directions Liu Pengjie, Wu Yanqiang, Shao Feng, Zhang Yan, Shao Hu Acta mathematica scientia,Series A. 2023, 43 (2):  570-580.  Abstract ( 103 )   RICH HTML PDF (408KB) ( 200 )   Save The conjugate gradient method is one of the effective methods to solve large-scale unconstrained optimization. In this paper, the Hestenes-Stiefel (HS) conjugate parameter is improved, and then two extended HS-type conjugate gradient methods with restart directions are established by introducing restart conditions and restart directions. The first method produces descent direction under the weak Wolfe line search, and the second one obtains sufficient descent independent of any line search. Under conventional assumptions, the global convergence results of the two proposed methods are analyzed and obtained. Finally, the numerical comparison results and performance graphs show the effectiveness of the new methods. Figures and Tables | References | Related Articles | Metrics

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Self Adaptive Viscosity Algorithm for Solving Variational Inequality Problem in Hilbert Spaces Xia Pingjing, Cai Gang Acta mathematica scientia,Series A. 2023, 43 (2):  581-592.  Abstract ( 96 )   RICH HTML PDF (404KB) ( 115 )   Save In this paper, we propose a new self adaptive subgradient extragradient viscosity algorithm for solving pseudomonotone variational inequality problems in Hilbert space. Using the new stepsize rule, the strong convergence theorem is obtained without any information about the Lipschitz constant. The effectiveness of the suggested algorithm is illustrated through some numerical examples. Figures and Tables | References | Related Articles | Metrics

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Inertial Projection Algorithms for Quasimonotone Variational Inequalities Yang Lanxiang, Chen Yi, Ye Minglu Acta mathematica scientia,Series A. 2023, 43 (2):  593-603.  Abstract ( 49 )   RICH HTML PDF (385KB) ( 98 )   Save In 2020, Liu and Yang proposed a projection algorithm (LY for short) for solving quasimonotone variational inequality in Hilbert Space. In this paper, by taking a new inertia coefficient, we present an inertial technique to accelerate LY. Under the same assumptions, the global weak convergence of the sequence generated by this algorithm is obtained. Numerical experiments show that the new algorithm can accelerate LY from the point view of iterate number steps and the point view of CPU time cost by taking suitable parameters. Figures and Tables | References | Related Articles | Metrics

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A Generalized HBV Diffusive Model with DNA-Containing Capsids and Cell-Cell Infection Liu Lili, Wang Honggang, Li Yazhi Acta mathematica scientia,Series A. 2023, 43 (2):  604-624.  Abstract ( 59 )   RICH HTML PDF (1625KB) ( 278 )   Save This paper investigates a generalized HBV diffusive model, where two HBV infection ways, general incidence functions and DNA-containing capsids are considered. This paper gives the well-posedness of model and then obtains the threshold dynamical behaviors of the proposed model, including the unique existence of two equalibria, the uniformly persistence of the model and global stability by using Lyapunov functionals. The numerical simulations not only verify the theoretical results, but also explore the influence of diffusion on the state variables. The result shows that diffusion affects the HBV infection, and the bigger of diffusion is, the larger of HBV infection region will become. Figures and Tables | References | Related Articles | Metrics

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Analysis of ${M/G/1}$ Repairable Queueing System with a Replaceable Repair Facility, ${N}$-policy and Delayed Uninterrupted Single Vacation He Yaxing, Tang Yinghui, Liu Qionglin Acta mathematica scientia,Series A. 2023, 43 (2):  625-645.  Abstract ( 75 )   RICH HTML PDF (595KB) ( 76 )   Save This paper considers an $M/G/1$ repairable queueing system with $N$-policy and delayed uninterrupted single vacation, in which the repair facility subject to breakdowns and then replaced during the repair facility busy period. By the renewal process theory, the total probability decomposition technique and the Laplace transform tool, some reliability indices of the service station and the repair facility are discussed, such as the transient-state and steady-state unavailability, and the expected failure number during $(0,t]$, etc., and the parameter sensitivity analysis is carried out on the steady-state unavailability and the steady-state failure frequency. Figures and Tables | References | Related Articles | Metrics

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Mathematical Modeling and Dynamic Analysis of Echinococcosis Transmission in Tibet Autonomous Region Xu Yue, Han Xiaoling Acta mathematica scientia,Series A. 2023, 43 (2):  646-656.  Abstract ( 65 )   RICH HTML PDF (787KB) ( 111 )   Save In this paper, by studying the transmission mechanism of echinococcosis and the epidemic status of echinococcosis in Tibet, we constructed a dynamic model of echinococcosis in line with the actual situation in Tibet. The stability of the equilibrium point of the model is analyzed by Lyapunov function, and the global stability of disease-free equilibrium point and endemic equilibrium point is proved. Using the collected data, according to the model, the basic regeneration number $R_{0}$ and the prevalence of echinococcosis were estimated and simulated. The results show that the model is in line with the local actual communication situation and has certain rationality. Finally, reasonable suggestions are given for the prevention and treatment of domesticated stray dogs and publicity and education. Figures and Tables | References | Related Articles | Metrics