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相关概念视频

Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

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

Magnetic Field Due To A Thin Straight Wire

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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.
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Magnetic Field Of A Current Loop01:16

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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.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Torque On A Current Loop In A Magnetic Field01:13

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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相关实验视频

Updated: Jan 12, 2026

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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固体中的低交流损失Nb3Sn验证模型线圈,用于快速切换场的MRI磁铁原型.

Jintao Hu1, Junseong Kim2, Liangjun Shao1

  • 1Francis Bitter Magnet Laboratory (FBML)/Plasma Science and Fusion Center (PSFC), Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.

IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee
|November 3, 2025
PubMed
概括

这项研究引入了一种用于磁共振成像 (MRI) 的新型超导磁铁,可以快速切换磁场. 这项技术通过快速在高场和低场之间切换,使新的成像技术和微分放松度学成为可能.

关键词:
快速切换领域的快速切换领域高导电性的热链.低交流损失的Nb3Sn线圈这就是为什么MRI是MRI.固体气是一种固体气.

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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科学领域:

  • 超导磁铁技术是超导磁铁技术的一种.
  • 磁共振成像 (MRI) 应用程序
  • 先进的材料科学是先进的材料科学.

背景情况:

  • 传统的MRI磁铁使用静态磁场.
  • 在MRI中快速切换磁场为新的对比机制提供了潜力.
  • 开发用于快速场切换超导磁体的技术对于下一代MRI至关重要.

研究的目的:

  • 设计和测试一个低交流损失的-锡 (Nb3Sn) 模型线圈,用于快速切换场的MRI磁铁.
  • 为了验证能够在1秒内在3T和0.5T之间切换的磁铁的启用技术.
  • 探索新的对比机制,如交叉路口和电性去磁化/再磁化.

主要方法:

  • 开发一个低交流损失的Nb3Sn线圈.
  • 实施一种使用热导热连接到固体的新型冷却技术.
  • 将热链接固定在冷冷却器冷头上,以实现高效的传热.
  • 测试模型线圈以分析快速场切换期间的温度升高.

主要成果:

  • 成功设计和测试了Nb3Sn模型线圈.
  • 演示磁铁设计,使高 (3 T) 和低 (0.5 T) 场之间快速切换.
  • 验证了一个冷却系统,可以在快速场变化时防止火.
  • 分析线圈内最大温度升高的情况.

结论:

  • 开发的低交流损耗Nb3Sn线圈和冷却系统是快速切换场MRI磁铁的关键启用技术.
  • 这项技术促进了新的MRI对比机制和微分放松计.
  • 该设计允许快速改变磁场,而不会影响超导体的稳定性.