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相关概念视频

¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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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.
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Energy Stored In A Coaxial Cable01:31

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Electromagnetic Fields01:30

Electromagnetic Fields

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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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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相关实验视频

Updated: Jun 6, 2025

Fabrication and Characterization of Superconducting Resonators
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基于14T处被动解方法的16通道袖式天线阵列.

Youheng Sun1, Miutian Wang2, Jianjun Du3

  • 1Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, 100871, China.

Journal of magnetic resonance (San Diego, Calif. : 1997)
|November 22, 2024
PubMed
概括

这项研究引入了一种新的被动解方法,用于14特斯拉的16通道头线圈阵列. 优化的方法减少了射频场干扰,提高了B1+效率,提高了磁共振成像性能.

关键词:
被动脱是指被动的脱.射频线圈设计的设计袖子天线的天线在UHFMRI中使用超高频率MRI.

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相关实验视频

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 无线电频率 (RF) 工程
  • 生物医学工程 生物医学工程

背景情况:

  • 在超高电场 (14 T) 的头线圈阵列中,存在元素合问题.
  • 由于射频场干扰,现有的被动解方法可以降低B1+效率.

研究的目的:

  • 为14T的16通道头线圈阵列开发一种新的被动解方法.
  • 为了最大限度地减少解元件和主射频场之间的破坏性干扰.

主要方法:

  • 利用被动双极天线来解一个16通道的袖子天线阵列.
  • 使用电磁模拟和人体模型优化双极定位.
  • 构建和测量了优化袖形天线阵列的S参数.

主要成果:

  • 新的被动解方法有效地减少了解元件的射频场干扰.
  • 与双极阵列相比,优化的袖子天线阵列表现出更高的B1+效率.
  • 通过开发的袖子天线阵列观察到更好的传输性能.

结论:

  • 拟议的被动解策略提高了14T的头线圈阵列性能.
  • 这种方法为提高B1+效率和信号传输在超高场MRI中提供了可行的解决方案.