排序方式: 共有88条查询结果,搜索用时 15 毫秒
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本文中,我们研究一类带有非单调扰动算子的二阶非线性发展方程的反周期问题,证明方程中的非单调扰动算子为极大单调的,并用极大单调算子的微单调扰动理论来证明此类方程的反周期解的存在性。 相似文献
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Liu Lanzhe 《Proceedings Mathematical Sciences》2005,115(2):167-190
In this paper, we prove some BMO end-point estimates for some vector-valued multilinear operators related to certain singular
integral operators. 相似文献
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基于最优化方法求解约束非线性方程组的一个突出困难是计算 得到的仅是该优化问题的稳定点或局部极小点,而非方程组的解点.由此引出的问题是如何从一个稳定点出发得到一个相对于方程组解更好的点. 该文采用投影型算法,推广了Nazareth-Qi$^{[8,9]}$ 求解无约束非线性方程组的拉格朗日全局算法(Lagrangian Global-LG)于约束方程上; 理论上证明了从优化问题的稳定点出发,投影LG方法可寻找到一个更好的点. 数值试验证明了LG方法的有效性. 相似文献
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A V-cycle multigrid method is developed for a time-dependent viscoelastic fluid flow satisfying an Oldroyd-B-type constitutive equation in two-dimensional domains. Also existence, uniqueness, and error estimates of an approximate solution are discussed. The approximate stress, velocity, and pressure are, respectively, σ k -discontinuous, u k -continuous, and p k -continuous. 相似文献
5.
Tiexiang Fu 《Electroanalysis》2008,20(1):68-74
The results concerning the gas‐sensing characteristics of novel NO2 gas sensors, fabricated from complex [Cr(bipyO2)Cl2]Cl thin films, were first presented. The sensors exhibited high response to NO2 gas in the concentration range from 1.97% to 6.67% at relative low temperatures (from room temperature to 348 K). No response to H2S and SO2 was observed. The maximum response for 6.03% NO2 was approximately 11.7 at 338 K and 10 V operating voltage. The response time of the sensors was about 4.5 min for NO2 and the recovery time about 40 s. The effect of the electrical resistance change of the sensors in the presence of NO2 could be used for gas sensing measurements. The performance and reliability of the sensors showed their potential applications for monitoring and controlling NO2 component continuously in chemical production. 相似文献
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两参数齐次独立增量过程在原点的局部性质 总被引:2,自引:0,他引:2
Adler曾经给出了两参数独立增量过程的特征函数的一般形式.本文对齐次情形给出了更具体的表达式,引进了累积量的概念.在此基础上,研究了比值X(s,t)/st在原点的分布,单调过程在原点的局部性质以及任意过程在原点的局部增长.由此得到了Brown单和不包含高斯分量的过程在原点的局部增长. 相似文献
8.
Images of locally compact metric spaces 总被引:1,自引:0,他引:1
Li Zhaowen 《Acta Mathematica Hungarica》2003,99(1-2):81-88
We establish relationships between locally compact-metric spaces and all kinds of spaces with mk-system (compact k-network) by means of compact-covering mappings, quotient mapping and closed mappings.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
9.
李应求 《数学物理学报(A辑)》2007,27(2):269-276
借鉴确定环境中马氏链暂留性的定义,在随机环境中马氏链的研究领域,引入了各种暂留性的概念,在确定环境中这些暂留性是等价的,而在随机环境中它们不等价.讨论了各类暂留性之间的相互关系及其基本性质,给出了链和状态是暂留的一些判别准则. 相似文献
10.
Liu Zhenhai 《Israel Journal of Mathematics》2002,129(1):363-372
This paper is devoted to the existence of solutions for a class of implicit Cauchy problems. The main tools in our study will
be a convergent approximation procedure and the theory of pseudomonotone perturbations of maximal monotone mappings.
This research is supported by the National Natural Science Foundation of China (No. 10171008). 相似文献