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Yen-Shung TSAI 《中国科学A辑(英文版)》2007,50(7):1026-1034
By means of further investigation of solid codes,the problem“Is every fd-domain uni- formly dense”proposed by Yuqi Guo,C.M.Reis and G.Thierrin in 1988 is solved in this paper. 相似文献
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Taking TiCu alloy as an example, based on the measurement of thermal expansion coefficient, the harmonic vibration cpefficient and anharmonic vibration coefficient of atoms were calculated. With the help of Collins model, the author worked out the thermodynamic function and the solubility curve under the atomic anharmonic vibration. And, the influence of the anharmonic vibration was also discussed. 相似文献
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Exponential stability of cellular neural networks with multiple time delays and impulsive effects 下载免费PDF全文
In this work, the stability issues of the equilibrium points of the cellular neural networks with multiple time delays and impulsive effects are investigated. Based on the stability theory of Lyapunov-Krasovskii, the method of linear matrix inequality (LMI) and parametrized first-order model transformation, several novel conditions guaranteeing the delaydependent and the delay-independent exponential stabilities are obtained. A numerical example is given to illustrate the effectiveness of our results. 相似文献
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The eleven low-lying energy levels of a hydrogen atom, and its mean radius in a uniformly high magnetic field B are calculated in a simple variational approach. The potential term containing squared magnetic field in Hamiltonian operator is separated into spherically and nonspherically symmetric potentials. The influence over levels and radius of the hydrogen atom is discussed. The results are in good agreement with the recent literatures, but more accurate. We find that the stronger the'magnetic field is, the smaller the mean radius of the hydrogen atom is. 相似文献
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设X是局部凸Fréchet空间,(Ω,Σ,μ)是非负有限测度空间,则LX1(μ,Σ)是完备的,从而也是局部凸Fréchet空间. 相似文献
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掺杂和取代对聚苯胺导电性能影响机制的研究 总被引:4,自引:0,他引:4
在导电聚合物的研究中,聚苯胺及其衍生物一直是人们相当感兴趣的课题.此类聚合物既可用氧化剂掺杂,也可进行质子酸掺杂,掺杂后其电导率可提高约十个数量级{1,’];利用在主链上引入取代基等化学修饰方法,可方便地调节其溶解性、加工性等物理化学性能.已有的研究结果表明,主链的化学修饰往往给聚苯胺的导电性能带来不利影响*.因此,如何使聚苯胶类导电聚合物保持高的电导率且同时具备优良的物理加工性能使成为此类导电聚合物研究中的一个亟待解决的问题一本文利用鼻子化学EHMO-CO方法对掺杂和取代影响聚苯胺及其衍生物导电性… 相似文献
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本文将Wielandt-Hoffman定理的一种对称形式推广到四元数体上,得到了自共轭矩阵二项式的广义F-范数估计定理和一个幕迹定理. 相似文献
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利用Finsler法曲率A、Landsberg曲率Ly、法切曲率Fy、Berwald联络D以及第二基本形式Ⅱy,研究Minkowski空间中的子流形、子流形的旗曲率与李齐曲率. 相似文献
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