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arXiv 1105.3098cond-mat.soft
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模拟中流体膜的弯曲刚度和自发曲率的测量

Measurement of the bending rigidity and spontaneous curvature of fluid membranes in simulations

Hayato Shiba, Hiroshi Noguchi

摘要:

利用两种无网格膜模型研究了测量流体膜弯曲刚度和自发曲率的几种数值方法。弯曲刚度估计从平面和管状膜的热波动和管状膜的轴向力。我们发现了一个很大的依赖性,其估计值从热波动分析上的最小二乘拟合的截止频率q_{cut}。逆功率谱拟合与外推到q_{cut} -> 0产生最小的估计误差之间的调查方法。根据管状膜的轴向力和弯曲膜条纹的平均曲率估计自发曲率。这些方法的结果显示出良好的一致性。

英文摘要:

Several numerical methods for measuring the bending rigidity and the spontaneous curvature of fluid membranes are studied using two types of meshless membrane models. The bending rigidity is estimated from the thermal undulations of planar and tubular membranes and the axial force of tubular membranes. We found a large dependence of its estimate value from the thermal undulation analysis on the upper-cutoff frequency q_{cut} of the least squares fit. The inverse power-spectrum fit with an extrapolation to q_{cut} -> 0 yields the smallest estimation error among the investigated methods. The spontaneous curvature is estimated from the axial force of tubular membranes and the average curvature of bent membrane stripes. The results of these methods show good agreement with each other.

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