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    Modification of a Class of Double-Parameterized Filled Function Methods for Global Optimization
    Zhu Wenxing
    Acta mathematica scientia,Series A    1999, 19 (5): 550-558.  
    Abstract721)      PDF(pc) (373KB)(1532)       Save

    A class of doubleparameterized filled function methods developed for unconstrained global minimization problem needs the assumption that the optimization problem has only a finite number of local minimizers, and has parameters which are restricted by the inimal radius of the S-basin of some local minimizer of the problem. In this paper, we modify them such that the two weaknesses are overcome. Numerical experiments show that the algorithm is efficient.

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    On Dual Gap of Semi-infinite Programming
    LI Shi-Zheng
    Acta mathematica scientia,Series A    2000, 20 (1): 1-5.  
    Abstract826)      PDF(pc) (305KB)(1608)       Save

    Thispaperproposesadualproblem (D1)forasemiinfiniteconvexprogrammingproblem (P).Itisprovedthatasufficientandnecessaryconditionofnodualgapbetween (D1)and (P)isnodualgapbetween (P)andLagrange'sdualproblem(D)of(P).Thesaddlepointcriterionof(P)isacharacterizedbyusingthedirectionalderivative.Semiinfiniteprogramming,Dualproblem,Dualgap,Directionalderivative,Subdifferential.

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    A Strong Limit Theorem for the Harmonic Mean of the Random Transition Probabilities of Finite Nonhomogeneous Markov Chains  
    Liu Wen
    Acta mathematica scientia,Series A    2000, 20 (1): 81-84.  
    Abstract1066)      PDF(pc) (286KB)(1507)       Save
     Let {Xn, n≥0} be a nonhomogeneous Markov chain with state space I = {1, 2, …, N} and transition probabilities pn(i, j) = P(X n =j|Xn-1 = i). In this paper the conditions that the harmonic mean of random transition probabilities p1(X0,X1),…, pn (Xn-1,Xn) converges to 1/N a.s. are investigated, and the differentiation technique on a net together with the tool of generating function for the study of strong limit theorems of Markov chains is presented.
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    Acta mathematica scientia,Series A    1997, 17 (4): 361-363.  
    Abstract79)      PDF(pc) (221KB)(708)       Save
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    A Class of Singulaly Perturbed Problem for Reaction Diffusion Equations With Nonlocal Boundary Conditions
    Mo Jiaqi, Chen Yusen
    Acta mathematica scientia,Series A    1997, 17 (1): 25-30.  
    Abstract107)      PDF(pc) (330KB)(706)       Save
    A class of initial-boundary value problems for the singularly perturbed reaction diffusion equations with nonlocal boundary conditions are considered. Under suitable conditions, using the comparison theorem the asymptotic behavior of solution for the initial boundary value problems are studied.
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    Some Properties of Quasi-Periodic Functions and Their Applications
    Hu Keqi, Zhang Qingcai
    Acta mathematica scientia,Series A    2024, 44 (6): 1415-1425.  
    Abstract285)   HTML10)    PDF(pc) (560KB)(532)       Save

    In this paper, we estimate relevant properties of quasi-periodic functions, and these properties are applied. Under the additional condition, the conjecture proposed by Yang is solved.

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    A new exploration of the inverse operator solution for a kind of strong nonliear partial differential equations with initial-boundary value problems
    Wu Baoting Sun Yanping
    Acta mathematica scientia,Series A    1999, 19 (3): 347-355.  
    Abstract734)      PDF(pc) (376KB)(1395)       Save

     By means of the Inverse Operator Method, the approximate analytic solution for the mathematical model of the packed bed catalytic reactor (i.e.akind of strong nonliner partial differential equations  with initial-boundary value problems) are studied.A new technique,which replaces‘the arithmetic mean of the partial solutions’by ‘the geometry mean of the partial solutions’, is put forward. The technique leds that the appoximate analytic solutions are given reasonably.

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    Weak Transverse and Weak Chaos
    Zhang Jianfeng, Xie Xiangdong
    Acta mathematica scientia,Series A    1998, 18 (3): 241-245.  
    Abstract87)      PDF(pc) (338KB)(606)       Save
    On the premise of unchange the fundamental characteristic of chaos, the article introduce the concept of weak transverse and weak chaos and prove that the diffeomorphism is weak chaotic if it have weak transverse homoclinic point.
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    Asymptotic Properties in Nonlinear Reproductive Dispersion Models
    Tang Niansheng Zhu Zhongyi Wei Bocheng
    Acta mathematica scientia,Series A    2000, 20 (3): 321-328.  
    Abstract1076)      PDF(pc) (352KB)(1410)       Save

    This paper proposes some mild regularity conditions analogous to those given by Wei (1998) and Fahrmeir & Kaufmann (1985) under which the existence, the strong consistency and the asymptotic normality of maximum likelihood estimation (MLE) are given in nonlinear reproductive dispersion models (NRDM). The previous results in the literature are generalized to NRDM.

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    Acta mathematica scientia,Series A    1996, 16 (3): 276-283.  
    Abstract96)      PDF(pc) (484KB)(660)       Save
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    Bayesian Procedure in Classification Problem With Linear Expon ential Hazard Function
    WEI Li-Li, ZHANG Wen-Xiu
    Acta mathematica scientia,Series A    2003, 23 (4): 436-443.  
    Abstract1348)      PDF(pc) (390KB)(2284)       Save

    Let Π0 and Π1 be two populations, the hazard functions  of which are linear exponential functions with different param eters.For the life data X in an experiment, the Bayesian stopping rule and decision r ule of the classification problem are given in this paper, where the loss functi o n of the model is the sum of the cost of the experiment time and the loss due to  the wrong decision.

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    Normalized Solutions of the Quasilinear Schrödinger System in Bounded Domains
    Zhang Qian
    Acta mathematica scientia,Series A    2025, 45 (1): 1-30.  
    Abstract337)   HTML12)    PDF(pc) (779KB)(463)       Save

    This paper is concerned with the following nonlinear coupled system
    $\left\{\begin{array}{l} -\Delta u_{1}+\omega_{1} u_{1}-\frac{1}{2} \Delta\left(u_{1}^{2}\right) u_{1}=\mu_{1}\left|u_{1}\right|^{p-1} u_{1}+\beta\left|u_{2}\right|^{\frac{p+1}{2}}\left|u_{1}\right|^{\frac{p-3}{2}} u_{1} \\ -\Delta u_{2}+\omega_{2} u_{2}-\frac{1}{2} \Delta\left(u_{2}^{2}\right) u_{2}=\mu_{2}\left|u_{2}\right|^{p-1} u_{2}+\beta\left|u_{1}\right|^{\frac{p+1}{2}}\left|u_{2}\right|^{\frac{p-3}{2}} u_{2} \\ \int_{\Omega}\left|u_{i}\right|^{2} \mathrm{~d} x=\rho_{i}, \quad i=1,2, \quad\left(u_{1}, u_{2}\right) \in H_{0}^{1}\left(\Omega ; \mathbb{R}^{2}\right) \end{array}\right.$
    and linear coupled system
    $\left\{\begin{array}{l} -\Delta u_{1}+\omega_{1} u_{1}-\frac{1}{2} \Delta\left(u_{1}^{2}\right) u_{1}=\mu_{1}\left|u_{1}\right|^{p-1} u_{1}+\beta u_{2} \\ -\Delta u_{2}+\omega_{2} u_{2}-\frac{1}{2} \Delta\left(u_{2}^{2}\right) u_{2}=\mu_{2}\left|u_{2}\right|^{p-1} u_{2}+\beta u_{1} \\ \int_{\Omega}\left|u_{i}\right|^{2} \mathrm{~d} x=\rho_{i}, \quad i=1,2, \quad\left(u_{1}, u_{2}\right) \in H_{0}^{1}\left(\Omega ; \mathbb{R}^{2}\right) \end{array}\right.$
    where $\Omega\subset\mathbb R^N(N\geq1)$ is a bounded smooth domain, $\omega_i,\ \beta\in\mathbb R$, $\mu_i,\ \rho_i>0,\ i=1,2.$ Moreover, $p>1$ if $N=1,2$ and $1<p\leqslant\frac{3N+2}{N-2}$ if $N\geqslant3$. Using change of variables, on the one hand, we prove the existence and stability of normalized solutions in nonlinear coupled system and the limiting behavior of normalized solutions as $\beta\rightarrow -\infty$. On the other hand, we apply the minimization constraint technique to obtain the existence of normalized solutions for linear coupled system. Compared with some previous results, we extend the existing results to the quasilinear Schrödinger system and also obtain normalized solutions for the linear coupling case.

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    Acta mathematica scientia,Series A    1989, 9 (4): 423-427.  
    Abstract79)      PDF(pc) (265KB)(526)       Save
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    Estimation of Failure Rate and its' Applications in the Case of Zero-Failure Data
    Han Ming
    Acta mathematica scientia,Series A    2000, 20 (3): 364-369.  
    Abstract797)      PDF(pc) (396KB)(1588)       Save

    In this paper, for zerofailure data of exponential distribution, if the prior density kernel of the failure rate λ is in form of λa-1, the author gives λ Bayesian estimation and hierarchical Bayesian estimation. When for life distribution such as exponential distribution of certain hydraulic engine , the author gives, then the reliability estimation of certain hydraulic engine under zero-failure data condition is obtained also.

     

     

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    Uniform Characterization of Function Spaces by Wavelets
    YANG Ai-Xiang, CHENG Zheng-Xin, BANG Li-Zhong
    Acta mathematica scientia,Series A    2005, 25 (1): 130-144.  
    Abstract1947)      PDF(pc) (473KB)(1755)       Save

    Using Littlewood Paley decomposition, Triebel classified most of function spaces into three index function spaces: Besov spaces and Triebel Lizorkin spaces. But such spaces  contain neither real interpolation spaces of two Sobolev spaces L^p(Lorentz spaces), nor dual space and predual space of  Triebel Lizorkin spaces F^{α,q}_1; the authors did not know how to give a uniform description for Triebel Lizorkin spaces and Lorentz spaces. Using wavelets, the authors can give all these spaces a uniform description: Triebel Lizorkin Lorentz spaces, BesovLorentz spaces and dual space and predual space of F^{α,q}_1; furthermore, the authors study also some properties for these spaces.

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    Exponential dichotomy and invariant manifold
    Xia Hongqiang
    Acta mathematica scientia,Series A    1998, 18 (2): 200-205.  
    Abstract78)      PDF(pc) (324KB)(518)       Save
    In this paper,the author proved that the nonlinear differential equation system exists stable and unstable manifolds if their associated homogenous equations satisfies exponential dichotomy and nonlinear part satisfies certain conditions; then he gave an applications on perturbed Hill equation.
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    Acta mathematica scientia,Series A    1991, 11 (1): 44-53.  
    Abstract58)      PDF(pc) (577KB)(585)       Save
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    电子等离子体波动方程的摄动分析
    LV Ke-Pu, DUAN Wen-Shan, DIAO Jin-Bao
    Acta mathematica scientia,Series A    2002, 22 (3): 353-360.  
    Abstract1316)      PDF(pc) (374KB)(1882)       Save

    该文采用减缩摄动法,将电子等离子体的非线性耦合方程组变换为非线性Schr¨odinger方程.

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    The Complete Classification of Solutions to the Step Initial Condition: Analysis and Numerical Verification for the Generalized Gardner Equation in Fluid Mechanics
    Zhang Yan, Hao Huiqin, Guo Rui
    Acta mathematica scientia,Series A    2024, 44 (5): 1242-1282.  
    Abstract75)   HTML3)    PDF(pc) (10179KB)(394)       Save

    In this paper, we investigate the evolution of the initial discontinuity for the generalized Gardner equation through the Whitham modulation theory, which the generalized Gardner equation can describe the transcritical flow of stratified fluids over topography. Firstly, we derive the linear harmonic wave, soliton and nonlinear trigonometric wave in different limiting cases via the periodic waves represented by the Jacobi elliptic functions. Then we obtain the Whitham characteristic velocities and modulation system based on the Riemann invariants by the finite-gap integration method. Since the modulation system of the generalized Gardner equation is neither strictly elliptic nor hyperbolic type, which makes the dynamical evolution behavior more varied in different regions compared to the KdV equation. Furthermore, we perform a complete classification for all wave structures in the cases of positive and negative cubic nonlinear terms, including the dispersive shock wave, rarefaction wave, trigonometric dispersive shock wave, solibore and their combinations. In addition, the correctness of the results is verified by numerical simulations, and the numerical solutions are in good agreement with the analytical solutions. Finally, the influences of the coefficients of the linear and nonlinear terms on the step initial value problem under certain conditions are analyzed.

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     Existence and Uniqueness of Solutions for a Class of Nonlinear Operator Equations |and its Applications
    ZHANG Xiao-Yan, SUN Jing-Xian
    Acta mathematica scientia,Series A    2005, 25 (6): 846-851.  
    Abstract1630)      PDF(pc) (333KB)(2012)       Save

    By using the  cone theory and the Banach contraction mapping principle,  the existence and uniqueness theorem of solutions for a class of nonlinear opera tor equations in ordered Banach spaces are investigated in more general condition. As an application, an existence and uniqueness theorem of solutions for initial  value problems of  nonlinear second order integro differential equations of mixed type in Banach  spaces are given. The results presented here improve and generalize some known results.

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