由于在固体表面活跃的游泳者，
Enhanced diffusion due to active swimmers at a solid surface
摘要：
我们考虑两个系统的主动游泳运动接近固体表面，一个是野生型\textit{E. coli}和其他的生活人口是一个自推进的金-铂棒组件。在这两种情况下，我们已经确定了两种不同类型的运动在表面上，并评估了人口的比例，显示弹道轨迹（积极的游泳者）相对于那些显示随机样行为。我们研究了这种复杂的游泳活动的被动示踪剂的扩散率也存在于表面上的效果。我们发现，示踪剂的扩散率是相对于标准的布朗运动增强，并与流体的活动，定义为产品的积极游泳者和他们的平均速度的分数线性增加。这一结果可以用主动游泳者和示踪者之间的一系列基本遭遇来理解。
英文摘要：
We consider two systems of active swimmers moving close to a solid surface, one being a living population of wild-type \textit{E. coli} and the other being an assembly of self-propelled Au-Pt rods. In both situations, we have identified two different types of motion at the surface and evaluated the fraction of the population that displayed ballistic trajectories (active swimmers) with respect to those showing random-like behavior. We studied the effect of this complex swimming activity on the diffusivity of passive tracers also present at the surface. We found that the tracer diffusivity is enhanced with respect to standard Brownian motion and increases linearly with the activity of the fluid, defined as the product of the fraction of active swimmers and their mean velocity. This result can be understood in terms of series of elementary encounters between the active swimmers and the tracers.
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