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相关概念视频

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

4.5K
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.
4.5K
Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

4.8K
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.
4.8K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

2.5K
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.
2.5K
Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

954
Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
954
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

3.9K
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
3.9K
Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

841
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
841

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相关实验视频

Updated: Jun 21, 2025

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

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一种基于流函数的高度线性梯度线圈设计的新方法.

Yufu Zhou1, Zhengrong Liu1, Qing Zhang1

  • 1Medical Imaging Center, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China.

Medical physics
|July 14, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种优化的梯度线圈设计方法,用于磁脑摄影 (MEG) 和磁共振成像 (MRI). 这种新方法显著提高了磁场的线性,提高了诊断成像能力.

关键词:
渐变线圈的渐变线圈粒子群集优化 粒子群集优化流的功能 流的功能目标场目标场的目标场.

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A Gradient-generating Microfluidic Device for Cell Biology
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A Gradient-generating Microfluidic Device for Cell Biology

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相关实验视频

Last Updated: Jun 21, 2025

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
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A Gradient-generating Microfluidic Device for Cell Biology
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科学领域:

  • 医学成像物理 医学成像物理
  • 生物医学工程 生物医学工程
  • 计算电磁学 计算机电磁学

背景情况:

  • 磁脑成像 (MEG) 和磁共振成像 (MRI) 是非常重要的非侵入性诊断工具.
  • 梯度线圈是MEG和MRI系统中必不可少的组件,需要优化设计以提高性能.

研究的目的:

  • 为设计高度线性梯度线圈提供一种新的,精简的方法.
  • 将流函数原理与梯度线圈设计的优化算法相结合.

主要方法:

  • 使用表面电流场的2D福里埃扩展的线圈形状表示.
  • 粒子群优化 (PSO) 用于根据线性和场均性优化线圈形状.
  • 在优化解决方案空间中整合设计参数,如电流分布,线圈转动和所需的场强度.

主要成果:

  • 双平面和圆柱形梯度线圈的最大线性空间偏差显著减少 (例如,双平面x梯度线圈的最大线性空间偏差从14%降至0.54%).
  • 显著改善了现场统一性,并降低了同质性错误指数.
  • 实验验证证了模拟和测量磁场结果之间的一致性.

结论:

  • 拟议的方法简化了梯度线圈的设计,并提高了线性.
  • 这一进步为工程和医学成像应用中改进磁场生成提供了潜力.