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《数学进展》2017,(5)
本文证明了:如果rectifiable空间G是局部Lindel?fΣ-空间,则G是强仿紧空间,该结论改进了文[Topology Appl.,2015,193:182-191]的一个结果;如果rectifiable空间G的某个紧化剩余是局部σ-空间,则G是局部紧空间或可分的度量空间,该结论推广了文[Topology Appl.,2010,157(4):789-799]的一个结果;如果非局部紧k-gentle仿拓扑群G在某个紧化bG中的剩余具有局部G_(δ-)对角线,则G是σ-紧的cosmic空间或者bG是可分的度量空间,该结论改进了文[Topology Appl.,2007,154(6):1084-1088]与[Topotogy Apt.,2009,156(5):849-854]的两个结果. 相似文献
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设X是拓扑空间,CL(X)表示X的所有非空闭子集的族,本文得到了下述结果:在CL(X)上的Fell-拓扑是伪肾的当且仅当X是feebly-紧或者非局部紧或者非σ-紧,由此得到了对于伪紧性不是闭遗传的两类新的拓扑空间。 相似文献
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设G为具有n个顶点的简单连通图.本文给出了图G的第k大规范拉普拉斯特征值的两个新上界,分别推广了已有的规范拉普拉斯谱半径的两个上界. 相似文献
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Magnetic monopoles stand for the static solution arising from a(1 + 3)–dimensional theory describing the interaction between a real scalar triplet and non–Abelian gauge field. In this paper, we obtain a two–point boundary value problem of a first–order ordinary differential equations from the self–dual monopole model. Then we establish the existence and uniqueness theorem for the problem by using a dynamical shooting method, we also obtain sharp asymptotic estimates for the solutions at infinity... 相似文献
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令G是简单图.记L(G)为图G的规范拉普拉斯矩阵,其特征值称为图的规范拉普拉斯特征值.[Adv.Math.(China),2017,46(6):848-856]给出了关于规范拉普拉斯特征值和的相关结论,并提出相关猜想.我们发现在上述文章中的一些重要结果中存在一些错误.本文修正了所有不正确的结果.此外,我们讨论了£(G)的特征值优超不等式.利用这些结果,我们证实了[Adv.Math.(China),2017,46(6):848-8561中提出的一个猜想. 相似文献
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《数学季刊》2017,(4)
This paper concerns an inverse problem of recovering implied volatility in shortterm interest rate model from the market prices of zero-coupon bonds. Based on linearization, an analytic solution, which is given as a power series, is derived for the direct problem.By neglecting high order terms in the power series, an integral equation about the perturbation of volatility is formulated and the Tikhonov regularization method is applied to solve the integral equation. Finally numerical experiments are given and the results show that the method is effective. 相似文献
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In this paper, we give a Fermion representation of the Phase model. We find that the states in the phase model can be described by Maya diagrams, and operators can be described by Fermions. We calculate the rule of multiplications of Young diagrams in N ×M box by Fermions, and also calculate the relations in the Phase model by Fermions. 相似文献
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本文重新考虑连续时间随机Solow模型,在Merton(1975)模型的条件下,若噪声相对较小时,资本及利率的随机微分方程存在唯一全局正解.本文证明这两类模型存在唯一的稳定分布. 相似文献
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Based on the Lagrangian action density under Born-Infeld type dynamics and motivated by the one-dimensional prescribed mean curvature equation, we investigate the polynomial function model in Born-Infeld theory in this paper with the form of-([1-a(φ)2]φ) = λf(φ(x)),where λ > 0 is a real parameter, f ∈ C2(0, +∞) is a nonlinear function. We are interested in the exact number of positive solutions of the above nonlinear equation. We specifically develop for the problem combined with a... 相似文献
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《应用数学和力学》2016,(12)
正On September16-20,2016,the top-level exchange of research results in computational fluid dynamics studies in Asia,i.e.the11th Asian Computational Fluid Dynamics Conference(ACFD11)was held at Dalian University of Technologyinternational forum for p,Dalianresentin,China.The ACFD aims to provide an g the latest achievements,exchanging innovative ideas and sharing the cutting-edge aspects of the theories, 相似文献
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《应用数学和力学》2016,(12)
对亚声速转捩热射流中失稳波相关的噪声产生机制进行了研究,并与冷射流中的结果进行了对比.基于时均大涡模拟(LES)流场,通过求解线性抛物化稳定性方程(LPSE)得到了失稳波的空间演化特性,然后基于LPSE的解与声比拟方法构建了射流的线性及非线性声源模型.LPSE结果表明,加热可以提高失稳波的空间增长率,使其更早达到饱和.由线性模型分析可知,加热会提高高频模态的声压级(SPL).与冷射流相比,热射流中线性模型预测的声压级与大涡模拟结果间的差距更小,表明线性机制在热射流中作用更大.在亚声速冷射流中,非线性模型在之前的研究中已经被证明可以提高声辐射效率.在当前热射流中,发现非线性模型与大涡模拟间的声压级差距被进一步的缩小,且温度相关的声源项在声辐射中发挥更重要的作用. 相似文献