光学的非高斯异常扩散
Jiaxing Gong1, Qi Li1, Shaoqun Zeng2
1Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
Physical review. E
|March 16, 2024
概括
光学旋表现出异常扩散,在复杂的粘弹性介质中偏离布朗运动. 这种子扩散,以分数布朗运动和非高斯分布为特征,为流体动力学和微观生物学提供了新的见解.
科学领域:
- 复杂系统物理 复杂系统物理
- 光学物理学 光学物理学
- 软物质物理学 软物质物理学
背景情况:
- 异常扩散在生物和物理系统中很常见,它偏离了标准的布朗运动.
- 光学之前只在随机斑点场中显示布朗运动.
研究的目的:
- 在复杂的介质中实验证明光的异常扩散.
- 调查这种异常扩散的潜在机制和特征.
- 探索光学在微观学中的潜在应用.
主要方法:
- 利用来自多重散射粘弹性介质的时间变化的斑点图案.
- 分析光学轨迹以确定自我相似性和反持久相关性.
- 调节样品粘弹性以控制扩散特性.
主要成果:
- 直接实验证据观察到光学的异常亚扩散.
- 运动表现出自我相似性和反持久相关性,与分数布朗运动 (FBM) 一致.
- 旋位移遵循非高斯式重尾分布,扩散特性可以通过粘性弹性进行调整.
结论:
- 粘弹性介质中的光扩散是复杂的FBM,但不是高斯的.
- 这一发现为动力学和布朗和高斯的脱提供了基本的见解.
- 光学旋显示出作为内源性追踪器的潜力,可用于微观生物学应用.
相关概念视频
01:20Gauss's Law: Cylindrical Symmetry
7.6K
A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
7.6K
01:19Viscosity of Fluid
400
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
400