论文标题
流动中有源游泳者的单个设备表征
Single-Trajectory Characterization of Active Swimmers in a Flow
论文作者
论文摘要
我们开发了一种推断伸长活性颗粒的相关物理特性的最大似然方法。我们使用对流游泳者的单个轨迹作为输入，我们能够准确地确定它们的旋转扩散系数和对纵横比的有效度量，也为这种数量的不确定性提供了可靠的估计量。我们使用数值生成的活动轨迹在无流量，简单的剪切和Poiseuille流量上验证理论结构，并具有出色的效果。我们的方法被设计为依靠单粒子数据，可以在游泳者表现出强烈的形态学多样性的实验条件下简化应用。我们简要讨论了一些正在进行的实验应用，特别是在流动中游泳大肠杆菌的表征。
We develop a maximum likelihood method to infer relevant physical properties of elongated active particles. Using individual trajectories of advected swimmers as input, we are able to accurately determine their rotational diffusion coefficients and an effective measure of their aspect ratio, also providing reliable estimators for the uncertainties of such quantities. We validate our theoretical construction using numerically generated active trajectories upon no-flow, simple shear, and Poiseuille flow, with excellent results. Being designed to rely on single-particle data, our method eases applications in experimental conditions where swimmers exhibit a strong morphological diversity. We briefly discuss some of such ongoing experimental applications, specifically, in the characterization of swimming E.coli in a flow.
