B 值复测度拟鞅的原子分解

设P 是一个概率测度,ψ是一个复值可积函数,dμ =ψdP是一个复值测度. 在权函数ψ∈a₁∩b_∝⁺和Banach空间X 具有适当的凸性和光滑性的条件下, 作者证明了关于复测度μ 的X值拟鞅空间D_α(X) 和_pQ_α(X) 上的原子分解定理. 并且利用复测度拟鞅的原子分解定理, 在0<α≤ 1 的情形, 证明了关于X 值复测度拟鞅的两个重要不等式.     

复测度鞅变换的收敛性及其应用

在满足ｂ_∞~（Ｋ）∩ａ_１（Ｋ）条件的情况下,讨论了关于复测度ｄμ＝ωｄν的鞅变换,证明了复测度鞅变换的几乎处处收敛性定理。并且,作为该定理的一个应用,对复测度鞅的点态收敛性作了较精细的讨论。     

复测度鞅空间及其对偶

本文在Ψ满足（Ｋ）条件或　　　的条件下，讨论了关于复测度ｄμ＝Ψｄｖ的鞅空间　　　　和ａＫ＿ｐ．证明了它们之间的等价性以及与关于非负测度ｄｖ的相应鞅空间的同构性，给出了它们的对偶空间，特别地Ｈ１＝ＢＭＯ，最后证明了关于复测度软的均方算子Ｓ（ｆ）是弱（１，１）有界的。     

拟鞅变换与UMD空间

本文定义了拟鞅变换,将Burkholder关于变换的不等式推广到拟鞅,同时应用拟鞅变换的若干性质刻划了UMD空间的特征.     

p-拟鞅变换

本文研究了p-拟鞅变换的问题.利用Banach空间的几何性质,得到一维和二维参数下拟鞅变换理论,推广了鞅变换的一些结果.     

复测度B值鞅的原子分解

本文利用停时方法给出复测度B值鞅的原子分解，讨论了复测度B值鞅空间的包含关系．此结果是非负测度鞅的推广．     

复测度双指标鞅的若干不等式

本文研究了关于复测度双指标鞅的某些性质.利用复测度双指标鞅的收敛定理,证明了极大算子f * 的弱(p,p)型和强(p,p)型不等式以及均方算子的有界性.     

三叉树模型下的等价鞅测度

本文研究了三叉树模型下的等价鞅测度刻划问题，得到了三叉树模型的最小熵鞅测度，逆相对熵鞅测度，方差最优鞅测度和极小鞅测度的精确表达式。     

复空间的凸性与Hardy鞅不等式

本文研究了取值于复拟Banach空间的一种特殊类型的鞅——Hardy鞅的不等式与该空间的解析一致凸性的关系,证明了Hardy鞅的q均方函数的弱(1,1)型,强(p,p)型和凸φ函数的不等式,并应用它们给出了复空间的解析q一致可凸性的等价条件.同时借助于复平面单位圆中的Banach空间值解析函数和Brown运动给出了同样的刻划.     

可积鞅测度的弱收敛

本文引入了可积鞅测度弱收敛的概念，并给出了可积鞅测弱收敛的一系列条件。     

Quasi-martingales with a linearly ordered index set

We consider quasi-martingales indexed by a linearly order set. We show that such processes are isomorphic to a given class of (finitely additive) measures. From this result we easily derive the classical theorem of Stricker as well as the decompositions of Riesz, Rao and the supermartingale decomposition of Doob and Meyer.     

拟鞅的Fefferman不等式和对偶定理

本文讨论了拟鞅的Fefferman不等式和Hardy空间的对偶空间. 利用鞅的相关结果和Doob分解的方法, 把鞅的Fefferman不等式推广到拟鞅情形, 并描述了拟鞅的Hardy空间Ĥ_p在1 < p < ∞)时的对偶空间.     

An application of martingales in the limit to a problem in information science

Martingales in the limit (mils) were introduced about two decades ago as nontrivial extensions of martingales. It was proved in 1976 that they have good convergence properties (at least) for real-valued stochastic processes. But, so far there have not been found any “real-life” applications of mils.In this article, we apply the full generality of mils to a problem in information science. There we study the evolution in time of source journals as, e.g., defined by the Institute for Scientific Information (ISI) who selects, on a yearly basis, the most “visible” journals in the world. In this connection one also encounters quasi-martingales.     

几类B值拟鞅空间上的原子分解

设1〈P≤2,0〈n≤1,X是P一致可光滑空间的Banach空间,则对每个X值拟鞅f=（fn）n≥0∈pHn^σ（X）存在分解fn=∑k∈Zμkαn^k（n≥0）,并且｜｜f｜｜pHα^σ（X）＋｜｜R（f）｜｜α～inf（∑k∈μk^a）^1/a,这里a^k=（an^k）n≥（k∈Z）是一列（1,α,∞;p）拟鞅原子,并且在L^1中收敛,sup k∈z｜｜a^k＊｜｜n〈∞,（μk）k∈Z∈la是非负实数列．对于拟鞅空间pHa^s（X）和qKn（x）成立类似的结果．此外,利用拟鞅原子分解定理,证明了几个拟鞅不等式．     

自由表面与粘性尾迹的相互作用

解析地研究了无限深不可压粘性流体中运动物体产生层流尾迹与自由表面波的相互作用．以定常的Oseen方程模拟受扰流动,对于小振幅自由表面波则采用线性化的运动学和动力学边界条件．在数学描述上,运动物体以Oseen极子模拟,受扰流场分解成表述粘性尾迹的无界奇异Oseen流和描述自由面效应的有界正则Oseen流之和．通过积分变换法,得到自由表面波的精确解．借助Lighthill的两步格式,导出了自由面波高带有附加校正项的渐近解．所得对称解显示了波动的振幅因粘性和潜深的存在而呈指数衰减．     

An optimal control problem for a pest, predator, and plant system

The paper is devoted to an optimal control problem for a system of three nonlinear parabolic equations from population dynamics. The equations model a trophic chain consisting of a predator, a pest and a plant species. The existence and uniqueness of the positive solution for the system are proved. The control variable is connected with the action of a pesticide. Our goal is to minimize the density of the pest and to maximize the plant density. The existence of the optimal solution is proved. The first and second order optimality conditions are established.     

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??Hidden Markov model is widely used in statistical modeling of time, space and state transition data. The definition of hidden Markov multivariate normal distribution is given. The principle of using cluster analysis to determine the hidden state of observed variables is introduced. The maximum likelihood estimator of the unknown parameters in the model is derived. The simulated observation data set is used to test the estimation effect and stability of the method. The characteristic is simple classical statistical inference such as cluster analysis and maximum likelihood estimation. The method solves the parameter estimation problem of complex statistical models.     

虚拟解法分析浸入边界法的精度

浸入边界法是对流固耦合系统进行建模和模拟的有效工具,在生物力学领域的应用尤为广泛．该文的工作主要包含两个部分:程序验证和精度分析．前者证明了程序的正确性,后者给出了浸入边界法的精度．两部分工作均使用虚拟解法作为研究工具．在程序验证部分,使用二阶空间离散格式进行数值计算,通过分析各种变量的离散误差,得到的程序计算精度阶是二阶,与理论精度阶一致,证明了数值计算所使用程序的正确性．精度分析部分工作在此基础上展开．引入压强跳跃,在动量方程中加入相应源项,通过分析带有源项的控制方程中各物理量的离散误差,证明浸入边界法只具有一阶精度．同时可以得出以下结论:粗网格无法敏感地捕捉浸入边界的影响;当Euler网格固定时,增加Lagrange标志点的数目并不会改善计算误差．     

Water waves diffraction by a circular plate

The interaction of water waves with circular plate within the framework of a linear theory is considered. The plate lies on the free surface in water of finite depth. The integral transform technique is used to solve this problem. The problem is reduced to a system of dual integral equations for a spectral function. The way to solve these equations consists in converting them into Fredholm integral equation of the second kind. The asymptotic solutions of this equation are obtained. Representations for diffraction field and for the forces on the plate are given.