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Eddy Currents01:25

Eddy Currents

1.6K
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
1.6K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

4.7K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
4.7K
Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

4.9K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
4.9K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

2.6K
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
2.6K
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

4.1K
Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
4.1K
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

3.0K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
3.0K

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相关实验视频

Updated: Jul 23, 2025

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
09:30

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

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用于MRI纵向梯度线圈的流分析方法.

Sadeq S Alsharafi1, Ahmed M Badawi1, AbdEl-Monem M El-Sharkawy1

  • 1Systems and Biomedical Engineering, Faculty of Engineering, Cairo University, Giza, Egypt.

Magnetic resonance in medicine
|July 19, 2023
PubMed
概括
此摘要是机器生成的。

一种新的定制的多层整合方法 (TMIM) 能够有效地分析金属结构中的旋流,从而实现更好的被动屏蔽和对梯度线圈的预强调补偿. 这种方法为复杂几何形状提供了一个计算效率高的替代方案.

关键词:
厄迪电流分析 厄迪电流分析梯度线圈是一个梯度线圈.的分析和的分析被动屏蔽是一种被动屏蔽.之前强调的重点.过渡性分析是一种过渡性分析.

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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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相关实验视频

Last Updated: Jul 23, 2025

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Cardiac Magnetic Resonance Imaging at 7 Tesla
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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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科学领域:

  • 物理 物理学 物理
  • 电气工程 电气工程
  • 计算电磁学 计算机电磁学

背景情况:

  • 在金属结构中由快速梯度场切换引起的流会在MRI等系统中产生不良影响.
  • 像网络分析 (NA) 这样的现有方法在几何和复杂性方面存在局限性.
  • 多层整合方法 (MIM) 是为了解决NA的一些局限性而引入的.

研究的目的:

  • 将多层积分方法 (TMIM) 定制为在薄结构中进行更一般的旋流分析.
  • 为了将TMIM与网络分析 (NA) 和Ansys对z梯度旋流的模拟进行比较.
  • 评估被动屏蔽和前强调补偿技术的效率.

主要方法:

  • 实现和交叉验证的NA和TMIM计算框架,用于对Ansys Maxwell进行和暂时旋流分析.
  • 模拟了一个预强调脉冲来补偿流.
  • 将TMIM应用于圆形不对称几何形状,并与 Ansys 对连接的z梯度进行验证.

主要成果:

  • TMIM计算的准确性与Ansys模拟相当,提供了更好的计算效率.
  • TMIM成功地应用于圆形不对称几何形状.
  • 评估了非封顶,封顶和滑动的被动屏蔽配置的性能.
  • 计算了一个有效的重点前补偿模型.

结论:

  • TMIM是一种计算效率高的方法,用于在复杂的梯度配置和屏蔽结构中进行和瞬时旋流分析.
  • TMIM为设计流的减轻和补偿技术提供了一个可行的工具.
  • 使用TMIM成功地证明了流的重力前补偿.