A Numerical Procedure to Evaluate Memory Effects in Non‐Equilibrium Coarse‐Grained Models

A Numerical Procedure to Evaluate Memory Effects in Non‐Equilibrium Coarse‐Grained Models
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评估非平衡粗粒度模型中记忆效应的数值程序

DOI:
10.1002/adts.202000197
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发表时间:
2020
影响因子:
3.3
通讯作者:
T. Schilling
T. Schilling
中科院分区:
工程技术3区
文献类型:
--
作者:
H. Meyer;S. Wolf;G. Stock;T. Schilling

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当开发复杂过程的粗粒度模型时,人们会遇到非平稳广义朗之万方程。该方程最重要的特征是存在非平稳记忆核。在这里,提出了一种方法来推断这个记忆内核从MD模拟数据在非平衡过程。该方法提供了一个以前发表的数值方案,其适用性是有限的截断问题的改进。作为一个例子,该方法被应用于NaCl在水中的离子解离,其中在记忆核中观察到非平凡的阻尼振荡。
When developing coarse‐grained models of complex processes out of equilibrium, one encounters the non‐stationary generalized Langevin equation. The most important feature of this equation is the presence of a non‐stationary memory kernel. Here, a method is presented to infer this memory kernel from MD simulation data in non‐equilibrium processes. The method provides an improvement of a previously published numerical scheme, the applicability of which is limited by a truncation problem. As an illustration, the method is applied to ion dissociation of NaCl in water, for which non‐trivial dampened oscillations are observed in the memory kernel.
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