相关实验视频
Updated: Jun 14, 2025

14:25
Determining 3D Flow Fields via Multi-camera Light Field Imaging
Published on: March 6, 2013
16.6K
从实验数据中测量速度场的深度学习光流
Phu N Tran1, Sattvic Ray2, Linnea Lemma1,2
1Department of Physics, Brandeis University, Waltham, MA 02453, USA. hagan@brandeis.edu.
Soft matter
|September 3, 2024
概括
基于深度学习的光流 (DLOF) 准确地量化了基于微管的活性阴性流,在密集条件下优于粒子图像速度测量 (PIV). DLOF为软和生物物理流体动力学提供了一种多功能工具.
科学领域:
- 生物物理学的生物物理.
- 软物质物理学 软物质物理学
- 流体动力学 流体动力学
背景情况:
- 基于微管的活体体质表现出复杂的流体流.
- 量化这些流量对于理解活性物质系统至关重要.
- 像粒子图像速度计 (PIV) 这样的传统方法在密集或复杂的生物样本中面临局限性.
研究的目的:
- 评估基于深度学习的光流 (DLOF) 来量化主动阴性流.
- 在不同的样本标记密度下,将DLOF性能与PIV进行比较.
- 建立DLOF作为生物物理流体流量测量的强大工具.
主要方法:
- 深度卷积神经网络被用于从视频中提取DLOF特征.
- 使用半自动粒子跟踪和被动跟踪珠验证了流速.
- DLOF和PIV方法应用于不同标签密度的基于微管的活体内马特样本.
主要成果:
- 对于密集标记的样本,DLOF提供了比PIV更准确的速度场.
- DLOF成功地沿着阴性导体解决了流量细节,克服了PIV在高密度下对比度的限制.
- 对于标签稀疏的样本,DLOF给出了与PIV相似的结果,但分辨率更高.
结论:
- DLOF是一种比PIV更优越的方法,用于量化活性阴性流,特别是在密集条件下.
- 在复杂的生物物理系统中,DLOF提供了更高的分辨率并克服了PIV的局限性.
- 这项研究验证了DLOF作为一种多功能和准确的工具,用于在活性,软和生物物质中进行流体流动分析.
相关概念视频
Uniform Depth Channel Flow
63
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
63
Uniform Depth Channel Flow: Problem Solving
59
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
59
Velocity and Acceleration in Steady and Unsteady Flow
100
In fluid mechanics, velocity and acceleration are key concepts for analyzing particle motion in both steady and unsteady flow. Consider a fluid particle moving along a pathline, where its velocity depends on its position and time. The particle's acceleration is obtained by differentiating the velocity with respect to time.
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over...
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over...
100
Rapidly Varying Flow
56
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
56
Laminar and Turbulent Flow
8.5K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
8.5K
Steady Flow of a Fluid Stream
275
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
275

