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相关概念视频

Inverting and Non-inverting OpAmps01:20

Inverting and Non-inverting OpAmps

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In an inverting amplifier, the input voltage is connected through a resistor to the inverting terminal. Meanwhile, the non-inverting terminal is grounded and a feedback resistor is established between the inverting and output terminal, as depicted in Figure 1.
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Physical Pendulum01:06

Physical Pendulum

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When a rigid body is hanging freely from a fixed pivot point and is displaced, it oscillates similar to a simple pendulum and is known as a physical pendulum. The period and angular frequency of a physical pendulum are obtained by using the small-angle approximation and drawing parallels with a spring-mass system. The small-angle approximation (sinθ=θ) is valid up to about 14°.
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it...
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Simple Pendulum01:10

Simple Pendulum

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A simple pendulum consists of a small diameter ball suspended from a string, which has negligible mass but is strong enough to not stretch. In our daily life, pendulums have many uses, such as in clocks, on a swing set, and on a sinker on a fishing line. 
The period of a simple pendulum depends on two factors: its length and the acceleration due to gravity. The period is completely independent of any other factors, such as mass or maximum displacement. For small displacements, a pendulum is...
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Torsional Pendulum01:09

Torsional Pendulum

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A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played...
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Steps in the Modeling Process01:14

Steps in the Modeling Process

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Albert Bandura's theory of observational learning identifies four critical processes: attention, retention, motor reproduction, and reinforcement or motivation.
Attention is the first necessary component for observational learning. It involves focusing on what the model is doing and saying. For example, if you decide to take a drawing class to enhance your skills, you need to pay close attention to the instructor's words and hand movements. The characteristics of the model significantly...
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Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

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By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
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相关实验视频

Updated: Jan 29, 2026

Lower-Limb Biomechanical Characteristics Associated with Unplanned Gait Termination Under Different Walking Speeds
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Lower-Limb Biomechanical Characteristics Associated with Unplanned Gait Termination Under Different Walking Speeds

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在不对称步行中估计步骤长度,使用单个下背IMU数据和由双反向摆启发的生物机械模型.

Daniela Pinto1, Paulina Ortega-Bastidas2, Pablo Aqueveque1

  • 1Electrical Engineering Department, Faculty of Engineering, Universidad de Concepción, Concepción 4070386, Chile.

Bioengineering (Basel, Switzerland)
|January 28, 2026
PubMed
概括

这项研究引入了一个新的生物力学模型,用于使用单个下背传感器准确地估计步程长度,即使是不对称的步态. 该模型显示了高精度和临床潜力,用于监测步行障碍的个体.

关键词:
步态分析 步态分析人类的机车运动.倒置的双摆形模型脚步长度 脚步长度 脚步长度可穿戴式传感器传感器

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科学领域:

  • 生物力学 生物力学
  • 步态分析 步态分析
  • 可穿戴式传感器 穿戴式传感器

背景情况:

  • 步骤长度对于评估神经肌肉和生物机械功能至关重要.
  • 准确的步骤长度估计有助于监测神经,肌肉骨疾病和老年人.
  • 现有的模型通常假定步态对称,限制了受损人群的准确性.

研究的目的:

  • 开发和验证一个新的生物力学模型,用于步骤长度估计.
  • 为了使准确的步态评估使用一个单一的惯性传感器在下背部.
  • 为了考虑不对称的步态条件和骨盆旋转.

主要方法:

  • 由反转的双摆所启发的新型生物机械模型被开发出来.
  • 该模型使用一个单一的惯性传感器,放置在腰部.
  • 对33名成年人 (21名健康者,12名步行障碍者) 进行了OptiTrack运动捕捉系统的验证.

主要成果:

  • 该模型在健康成年人中实现了低的中位数绝对误差 (MdAE),在0.04米以下,在步行障碍者中达到0.06米以内.
  • 与黄金标准相比,观察到强相关性 (R = 0.96,R2 = 0.93) 和最小平均偏差 (0.64厘米).
  • 该模型在各种步行条件,包括不对称性中证明了有效性.

结论:

  • 拟议的生物机械模型准确地估计了步骤长度,即使在不对称的步态条件下.
  • 该模型将骨盆旋转纳入模型的能力提高了准确性,特别是对于行走障碍的人来说.
  • 这种方法为临床和现实应用提供了技术可行性和重大潜力,包括纵向患者监测.