共查询到11条相似文献,搜索用时 78 毫秒
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非平行板电容器电场和电容的另一种计算 总被引:13,自引:0,他引:13
通过求解电势的拉普拉斯方程,得到非平行板电容器两极板间的电势分布,从而求出其电场和电容,结果与用其他方法所得结果完全相同. 相似文献
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给出无限长均匀带电直线的复势,接着讨论平行直线排列与平行环形排列两种情况下,无限长均匀带电直线组的复势与电场,并由此得出相应的电场线与等势线方程. 相似文献
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Daniel O. Cajueiro 《Physica A》2010,389(9):1945-1703
In this paper, we explore how the approach of optimal navigation (Cajueiro (2009) [33]) can be used to evaluate the centrality of a node and to characterize its role in a network. Using the subway network of Boston and the London rapid transit rail as proxies for complex networks, we show that the centrality measures inherited from the approach of optimal navigation may be considered if one desires to evaluate the centrality of the nodes using other pieces of information beyond the geometric properties of the network. Furthermore, evaluating the correlations between these inherited measures and classical measures of centralities such as the degree of a node and the characteristic path length of a node, we have found two classes of results. While for the London rapid transit rail, these inherited measures can be easily explained by these classical measures of centrality, for the Boston underground transportation system we have found nontrivial results. 相似文献
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Any ensemble of random walks with symmetric transition probabilities will have symmetric properties. However, any single realization of such a random walk may be asymmetric. In an earlier paper, Weiss and Weissman developed a measure of asymmetry and applied it to random walks in the absence of a field, showing that the degree of asymmetry (in the diffusion limit) is independent of time and that the most probable degree of asymmetry corresponds to the maximum possible. We show in the present paper how the presence of a symmetric field can change this result, both in making the degree of asymmetry depend on time, and driving the random walk toward a more symmetric state. 相似文献
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基于对一典型Langevin问题——在双势井和变化的磁场中并受一恒冲量不断作用的运动带电粒子的动力学分析,利用频闪采样法,给出了描述粒子速度变化规律的复差分方程.选取适当的磁场强度和时间间隔(采样周期),将这一差分方程简化为用来构造广义M-J(Mandelbrot-Julia)集的复映射,并基于粒子的动力学特征探讨了广义M-J集的物理意义.结果发现:1)广义M-J集的分形结构特征可形象地反映出粒子速度的变化规律;2)选取的时间间隔有、无意义,决定了广义M-J集的分形结构是否具有连续性;3)广义M-J集的演
关键词:
Langevin问题
双势井
磁场
广义M-J集
物理意义 相似文献
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Arshak L. Vartanian Mkrtich A. Yeranosyan Albert A. Kirakosyan 《Physica E: Low-dimensional Systems and Nanostructures》2005,27(4):447-456
Using a variational technique, the effect of electron-longitudinal optical (LO) phonon interaction on the ground and the first few excited states of a hydrogenic impurity in a semiconductor quantum wire of rectangular cross section under an external electric field is studied theoretically for the impurity atom doped at various positions. The results for the binding energy as well as polaronic correction are obtained as a function of the size of the wire, the applied uniform electric field and the position of the impurity. It is found that the presence of optical phonons changes significantly the values of the impurity binding energies of the system. Taking into account the electron–LO phonon interaction the 1s→2py and 1s→2pz transition energies are calculated as a function of applied electric field for different impurity positions. 相似文献
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《Current Applied Physics》2018,18(8):912-918
In the conventional three-stage co-evaporation process to grow Cu(In,Ga)Se2 (CIGS) film, a large grain is achieved by the co-evaporation of Cu and Se on (In,Ga)2Se3 layer at 550 °C in the second stage and then a p-type is achieved by the co-evaporation of In, Ga, and Se in the third-stage. We reported a new process where a CIGS film with a large gain and p-type is achieved by evaporation of Cu only in the second stage at 400 °C and by the Se annealing in the third stage. In the new process, thermal budget was lowered and the third-stage co-evaporation process was eliminated. It was found that the CIGS gain size increased when the Cu/(In + Ga) ratio was above 0.7 and an addition thin CIGS layer appeared on the CIGS surface. The reaction path with Cu was described in the Cu-In-Se ternary phase diagram. The cell conversion efficiency increased from 9.6 to 15.4% as the Se annealing temperature increased from 400 to 550 °C in the third stage, mainly due to the increase of open-circuit voltage and fill factor. Our process demonstrated a new route to grow a CIGS film with a less thermal budget and simpler process in the co-evaporation process. 相似文献
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An effective potential method for the calculation of hydrogen molecule ion energy in a strong magnetic field 下载免费PDF全文
Using the adiabatic approximation and adiabatic variational approximation with an effective potential, the total energies and the equilibrium internuclear separations of H2+ ion in states σg, πu, δg, φu, γg, ηu in strong magnetic fields have been calculated. Our results reproduced those obtained by Vincke and Baye (Vincke M and Baye D 1985 J. Phys. B: At. Mol. Phys. 18 167), which are considered the most reliable. We found a basic function with better convergence than the Landau functions. 相似文献