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相关概念视频

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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Derivatives of Inverse Trigonometric Functions01:30

Derivatives of Inverse Trigonometric Functions

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A ship tracking an approaching aircraft relies on geometric measurements to find out the aircraft’s position relative to the observer. By measuring the slant distance to the aircraft and the angle of elevation, the horizontal and vertical components of the distance can be obtained using trigonometric relationships. This geometric approach provides a basis for analyzing how the observed angle changes as the aircraft moves closer to the ship.To examine the mathematical behavior of the angle...
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相关实验视频

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Doppler Optical Coherence Tomography of Retinal Circulation
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异步光学连贯弹性学和定向相梯度分析.

Ginger Schmidt1,2, Ryan McAuley1, Brett E Bouma1,2

  • 1Massachusetts General Hospital, Harvard Medical School, Wellman Center for Photomedicine, Somerville, Massachusetts, United States.

Journal of biomedical optics
|September 22, 2025
PubMed
概括
此摘要是机器生成的。

这项研究介绍了一种使用光学连贯断层扫描 (OCT) 的更快,更耐运动的3D剪波成像技术. 这种新方法提高了组织硬度评估的速度和准确性,有助于临床应用.

关键词:
光学连贯性弹性图形学光学连贯性断层扫描技术信号处理 信号处理 信号处理

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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
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科学领域:

  • 生物医学工程 生物医学工程
  • 医疗成像医学成像
  • 生物物理学的生物物理.

背景情况:

  • 组织刚性和服从是健康的关键指标,在疾病中经常发生变化.
  • 目前使用OCT的剪切波弹性图像受限于缓慢成像,运动工件和硬件需求,阻碍了临床使用.

研究的目的:

  • 开发和验证与标准的OCT系统兼容的实用,高速的3D剪波成像方法.
  • 克服基于OCT的现有弹性图谱的局限性,以改善临床翻译.

主要方法:

  • 开发了一种快速,非同步的3D剪切波场采集技术,使用常规速率的B扫描对.
  • 引入了定向相梯度分析,用于在各种波形条件下对强大的剪切波数进行估计.
  • 通过更密集的横向采样,实现了减少运动灵敏度和增强采集速度.

主要成果:

  • 在幻影研究中与同步成像对比的验证准确性.
  • 对波浪方向,激发幅度和扩散率的变化表现出强度.
  • 通过在不同条件下重复测量,证实了技术可靠性.

结论:

  • 开发的方法为剪切波成像提供了一个实用的方法.
  • 这种技术不需要对现有的临床相稳定OCT系统进行修改.
  • 能够更容易获得和可靠地评估组织机械性质.