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相关概念视频

Radial System Protection01:23

Radial System Protection

420
Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
420
Design Example01:23

Design Example

530
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
530
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

705
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
705
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

3.5K
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

445
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Magnetic Damping01:17

Magnetic Damping

1.0K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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相关实验视频

Updated: Jan 16, 2026

Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis
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辐射TRASE:通过机械旋转和主动数字解进行2D射频编码.

Christopher J Sedlock1, Aaron R Purchase2, Boguslaw Tomanek1

  • 1Department of Oncology, University of Alberta, Edmonton, Alberta, Canada.

Magnetic resonance in medicine
|October 3, 2025
PubMed
概括

这项研究介绍了Radial TRASE,这是一种用于2D磁共振成像的简化双线圈系统. 这种新方法可以在没有复杂硬件的情况下实现高效的空间编码,为医学成像提供了低成本的替代方案.

关键词:
射频线圈旋转的频率是什么横体核磁共振成像 (TRASE MRI) 是一个非常好的方法.积极的数字解.辐射编码 辐射编码无线电频率 (RF) 发射阵列传输阵列.一个扭曲的电磁体.

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Method to Measure Tone of Axial and Proximal Muscle
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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) 线圈技术
  • 图像编码技术 图像编码技术

背景情况:

  • 传统的2D发射阵列空间编码 (TRASE) 使用四个射频场,因元素相互作用而带来挑战.
  • 简化传输 (Tx) 阵列对于提高二维成像效率和降低复杂性是可取的.

研究的目的:

  • 介绍一种新的,低成本的2D辐射编码方案 (Radial TRASE),使用简化的双线圈阵列.
  • 为了克服2D成像中以前的多线圈TRASE方法的局限性.

主要方法:

  • 为了横向编码,开发了一个双线圈B1相梯度系统.
  • 发射阵列的机械旋转使辐射k空间获取成为可能.
  • 采用主动数字解来增强线圈隔离和减轻剩余合.
  • 实验验证是在2MHz的哈尔巴赫磁铁上进行的,该磁铁具有静态B0切片选择梯度.

主要成果:

  • 在水幽灵中,Radial TRASE实现了比1.67毫米更好的图像分辨率.
  • 简化的双线圈阵列显示出最小的图像扭曲.
  • 主动数字解将剩余合降低到 -50 dB,显著改善了隔离.
  • 顺序轴切片成像成功演示.

结论:

  • 双线圈辐射TRASE可以实现2D切片编码,而不需要快速切换的B0梯度.
  • 这种简化的设计大大降低了发射阵列的复杂性,并与以前的卡特西安TRASE方法相比改善了隔离.