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相关概念视频

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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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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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
861
Transducer Mechanism: Nuclear Receptors01:31

Transducer Mechanism: Nuclear Receptors

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Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
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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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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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相关实验视频

Updated: Jul 3, 2025

External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures

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任何核分布的活跃可编程发射线圈.

Victor Han1, Charlie P Reeder1, Miriam Hernández-Morales1,2

  • 1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California, USA.

Magnetic resonance in medicine
|February 11, 2024
PubMed
概括
此摘要是机器生成的。

一个新的任何核分布式活性可编程传输线圈 (ADAPT线圈) 能够对任何核进行磁共振成像 (MRI),而不仅仅是-1. 这一突破允许使用MRI技术进行更广泛的生物和医学研究.

关键词:
在 GaN GaN 中.射频线圈是一个RF线圈.一个X核.这是一个多核的多核国家.

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科学领域:

  • 医疗成像医学成像
  • 核磁共振 (NMR) 是一种核磁共振技术.
  • 生物物理学的生物物理.

背景情况:

  • 目前大多数磁共振成像 (MRI) 依赖于单个核,-1 (1H).
  • 存在着许多生物相关的核,为先进的研究提供了潜力.
  • 现有的MRI技术在对各种核的成像能力上是有限的.

研究的目的:

  • 开发一种能够激发任意核的单一发射线圈,用于人类规模的MRI.
  • 克服当前MRI技术在多核成像中的局限性.
  • 为了方便在1H以后对生物相关核的成像.

主要方法:

  • 介绍任何核分布式主动可编程传输线圈 (ADAPT线圈).
  • 集成快速开关以在任何相关频率上工作.
  • 直流 (DC) 功率直接转换为无线电频率 (RF) 磁场,由数字控制.
  • 线圈的分割以减轻半导体开关的不完美.

主要成果:

  • 电路模拟证实了ADAPT线圈的有效性.
  • 一个直径9厘米的表面ADAPT线圈成功实施.
  • 获得了1H,23Na,2H和13C的幻影图像.
  • 获得了1H和23Na的体外图像.
  • 通过改变数字控制信号,实现了核激发的实时重编程.

结论:

  • 在MRI中激发任意核的ADAPT线圈提供了一种具有成本效益,可扩展和高效的方法.
  • 这项技术可实现简化多核核核磁共振成像工作流程.
  • 它为研究数十个生物学上相关的核开辟了道路,推动了医学研究.