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相关概念视频

Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

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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...
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Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

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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...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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相关实验视频

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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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基于角光流算法的动态3D相位移配置测量.

Shi Lu, Hui Weng, Mingyou Dai

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    此摘要是机器生成的。

    这项研究介绍了一种更快的3D重建方法,使用角光流来进行相位转移型度计. 这种新方法通过减少计算来显著加快3D形状测量速度.

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    科学领域:

    • 计算机视觉 计算机视觉
    • 光学计量学 在光学计量学

    背景情况:

    • 实时3D重建在各个领域至关重要,需要更快,更准确的算法.
    • 使用卢卡斯-卡纳德光流的相位转移特征测量 (PSP) 提供了高精度,但受到缓慢的密集光流计算的影响.

    研究的目的:

    • 为了提高3D相位移形状测量的速度和实时性能.
    • 通过优化光流计算来减少3D重建中的计算负载.

    主要方法:

    • 提出了使用角光流算法的动态3D相位移配置测量技术.
    • 采用哈里斯角算法来识别对象上的特征点.
    • 计算光流量仅用于这些已识别的特征点.

    主要成果:

    • 通过将光流集中在特征点上,实现了显著的计算时间缩短.
    • 显示像素匹配效率增加了四倍.
    • 显示了3D重建速度的两倍改进.

    结论:

    • 拟议的角光流法大大提高了3D相位移形状测量的效率.
    • 这一进步可以实现更快,更有效的实时3D重建和显示.