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Measuring Acceleration Due to Gravity01:12

Measuring Acceleration Due to Gravity

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Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Holter Monitor: 24-Hour Monitoring

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Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
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Variation in Acceleration due to Gravity near the Earth's Surface01:20

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An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's...
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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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相关实验视频

Updated: Mar 15, 2026

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
07:24

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers

Published on: April 21, 2017

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在日常生活中基于持续加速计的震动检测.

Luis Martinez1, Orlando Martinez1, Stephen L Schmidt2

  • 1Department of Electrical and Computer Engineering, California State University, Los Angeles, Los Angeles, CA 90032, USA.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
概括
此摘要是机器生成的。

我们开发了一个自动化算法,使用手腕穿戴的加速度计来持续检测帕金森症震. 这种算法将与日常活动区分开来,帮助自适应性深度脑刺激 (DBS) 控制.

关键词:
帕金森症的震.适应性的DBS系统植入了一个加速度计.震动检测 震动检测 震动检测一个可穿戴的加速计.

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相关实验视频

Last Updated: Mar 15, 2026

A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
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科学领域:

  • 生物医学工程 生物医学工程
  • 神经科学是一个神经科学.
  • 可穿戴技术可穿戴技术

背景情况:

  • 帕金森病 (PD) 的管理需要先进的适应性深度大脑刺激 (DBS) 控制.
  • 连续的实时震检测对于优化DBS治疗至关重要.
  • 现有的震评估方法在日常生活场景中可能受到限制.

研究的目的:

  • 开发和验证用于连续检测帕金森发的自动化算法.
  • 评估使用可穿戴加速度计用于震动监测的可行性.
  • 为了区分帕金森发与日常生活活动中的自愿运动.

主要方法:

  • 开发了一种自动化算法,利用商用手腕加速度计 (Apple Watch) 和植入的DBS设备的三轴加速度数据.
  • 算法识别了自愿活动,然后检测到4-7赫兹帕金森震频段的峰值.
  • 采用连续波束变换来增强峰值和波检测,与短时间里埃变换相比.

主要成果:

  • 开发的算法在日常活动中准确地检测了帕金森的震.
  • 使用果手表的震动检测准确度高于植入的DBS设备 (IPG).
  • 该算法与DBS强度 (r = -0.93至 -0.97) 和行业标准度量 (r = 0.57) 显示出强烈的相关性.

结论:

  • 该自动化算法提供了一种临床相关的方法,用于使用可穿戴加速度计连续检测帕金森症.
  • 这项技术通过在日常生活中将震与自愿运动区分开来,促进了自适应的DBS控制.
  • 这些发现支持使用方便的商业手腕设备来监测PD震.