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相关概念视频

Reducing Line Loss01:18

Reducing Line Loss

In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...

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相关实验视频

Updated: Jun 20, 2026

Fabrication of High Contact-Density, Flat-Interface Nerve Electrodes for Recording and Stimulation Applications
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尽量减少电场和增加外围神经刺激值使用体梯度阵列线圈.

Reza Babaloo1,2, Ergin Atalar1,2

  • 1National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey.

Magnetic resonance in medicine
|April 16, 2024
PubMed
概括
此摘要是机器生成的。

梯度阵列线圈显著减少电场,并增强MRI中的外围神经刺激 (PNS) 值. 这项技术提高了特定磁场线性需求的安全性和性能.

关键词:
磁力共振成像安全 磁力共振成像安全可调节的线性区域.电磁场模拟电磁场模拟灵活的梯度线性线性是一种灵活的梯度.梯度阵列线圈线圈的梯度阵列线圈周围神经的刺激.

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科学领域:

  • 磁共振成像 (MRI) 物理 物理
  • 生物医学工程 生物医学工程
  • 电磁学 电磁学 电磁学 电磁学

背景情况:

  • 交换梯度诱导的电场 (E-场) 可以引起外周神经刺激 (PNS),限制MRI性能.
  • 传统的梯度线圈在优化场线性和最小化诱导的E场方面面临着挑战.

研究的目的:

  • 评估渐变阵列线圈,以减少E字段和增加PNS值.
  • 为了在可定制的线性区域 (ROLs) 中展示可调节的梯度线性.

主要方法:

  • 利用带有调节电流的体梯度阵列线圈来最大限度地减少车身模型上的E场.
  • 采用优化方法来确定电流幅度,将峰值E场视为目标函数.
  • 通过调整线圈参数和ROLs来探索各种场景.

主要成果:

  • 阵列线圈始终显示较低的E场和比传统线圈更高的PNS值.
  • 在44厘米的ROL内,X,Y和Z梯度的E场减少了10-61%.
  • 在特定场景中实现了4.3倍的PNS值增加.

结论:

  • 梯度阵列线圈代表了高性能MRI梯度系统的有希望的进步.
  • 这项技术提高了梯度强度,滑动率和PNS安全性.
  • 对于在目标区域需要线性磁场的应用特别有利.