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相关概念视频

Magnetic Force On Current-Carrying Wires: Example01:22

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Displacement Current01:19

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Significance of Displacement Current01:27

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A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual conduction current. However, it is produced by a changing electric field. Displacement current is defined in terms of a time-varying electric field, and also has an associated displacement current density. By adding a term accounting for displacement current, Maxwell modified the existing Ampère's law, which is now called generalized Ampère's law.
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
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Induced Electric Fields01:23

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Updated: Jun 16, 2025

Measurement of Bioelectric Current with a Vibrating Probe
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无线运动变量分析与集成的Triboelectric织品通过排位电流流变量分析.

Yinghong Wu1,2, Sunil Kumar Sailapu1, Chiara Spasiano1,3

  • 1Biomedical and Mobile Health Technology Group, Department of Health Sciences and Technology, ETH Zürich, Lengghalde 5, Zürich 8008, Switzerland.

ACS nano
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PubMed
概括
此摘要是机器生成的。

这项研究引入了一种用于无线运动传感的新型 triboelectric 织品. 这种完全以织品为基础的系统可以从日常活动和炼中持续,不受束的生物信号监测.

关键词:
移位电流的移位电流是什么运动变化的可变性.带电织品的三电织品穿戴式技术是一种可穿戴技术.无线生理监测无线生理监测

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科学领域:

  • 材料科学 材料科学 材料科学
  • 可穿戴技术可穿戴技术
  • 生物医学工程 生物医学工程

背景情况:

  • 部落电力织品提供了检测身体运动的潜力.
  • 目前的 triboelectric 可穿戴设备面临由于非织部件和有线连接的限制,阻碍了人类自然运动的无线信号传输.

研究的目的:

  • 开发一个完全基于织品的无线生物传感系统,用于连续,不受约束地监测人类运动.
  • 通过将传感元件直接集成到服装中来克服现有的 triboelectric 可穿戴设备的局限性.

主要方法:

  • 一种新的 triboelectric 织品是使用带有固有的微隙的电纳米纤维创建的.
  • 织品被无地编织成各种定位的服装.
  • 无线信号传输是使用由织感应器增强的位移电流实现的.

主要成果:

  • 该系统能够从日常活动和炼中进行无连续的生物信号监测.
  • triboelectric 织品有效地捕获了表明步伐时间和关节时间变化的信号.
  • 无线信号传输成功地直接从服装上演示,没有外部电源.

结论:

  • 这项工作在完全基于织品的无线可穿戴传感器方面取得了重大进展.
  • 开发的系统有助于下一代运动跟踪,健康监测和智能服装技术.
  • 电纳米纤维中固有的微隙是创建有效的 triboelectric 织品无集成的关键.