On stochastic resonance in a model of double diffusion
On stochastic resonance in a model of double diffusion
复制标题
双扩散模型中的随机共振
DOI：
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发表时间：
2018
影响因子：
1.8
通讯作者：
E. Aifantis
中科院分区：
文献类型：
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作者：
A. Chattopadhyay;Xiaoyong He;A.;A. Konstantinidis;E. Aifantis
双扩散模型于20世纪70年代末提出，80年代和90年代由Aifantis和他的同事推广。这是一个连续介质模型，它假定两个局部非平衡浓度场遵守由线性质量交换项介导的单独的质量-动量方程。目前的工作涉及两个竞争相密度的随机双扩散，以研究纳米晶体中的输运。结果表明，由随机动力学表示的表面不均匀和时间延迟的存在可能会对两相界面产生实质性的影响。这种效应在发生最大能量转移的临界点(随机共振)最为明显，从而量化了纳米晶体动力学中表面缺陷的影响。计算结果与实验数据进行了比较，结果令人满意。这是关于小规模力学-EUROMAT的专题问题的一部分。
The double diffusion model was proposed in the late 1970s and extended in 1980s and 1990s by Aifantis and co-workers. It is a continuum model that assumes two local non-equilibrium concentration fields abiding separate mass–momentum equations mediated by a linear mass exchange term. The present work deals with stochastic double diffusion of two competing phase densities to study transport in nanocrystals. We show that the presence of surface inhomogeneities and temporal delay, represented by stochastic dynamics, could have substantial impact at the interface of the two phases. The effect is most pronounced at a critical point (stochastic resonance), where maximum energy transfer occurs, thereby quantifying the impact of surface imperfections in nanocrystal dynamics. The results have been favourably compared with experimental data. This is part of a thematic issue on Small Scale Mechanics - EUROMAT.