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相关概念视频

Electric Field Lines01:25

Electric Field Lines

The three-dimensional representation of the electric field of a positive point charge requires tracing the electric field vectors, whose lengths decrease as the square of their distance from the charge and which point away from the charge at each point. This vector field is no doubt challenging to visualize. The visualization of electric fields becomes quickly intractable as the number of charges increases.
The solution to this problem is to use electric field lines, which are not vectors but...
Magnetic Field Lines01:19

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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.
Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...

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绘制看不见的地图:编程的电刺激来检测隐藏的导电块.

Rongheng Liao1, Lu Zhang1, Paul Knops1

  • 1Department of Cardiology, Erasmus Medical Center, Rotterdam, The Netherlands.

Heart rhythm
|November 2, 2025
PubMed
概括

编程电刺激 (PES) 有效地揭露了右心室的导电阻塞 (CBs),特别是当垂直于鼻节律时. 这种方法揭示了更严重和更广泛的CBs,有助于理解心房动.

关键词:
没有异性otropy.心房动是一种心房动.导电异常 导电异常心的映射绘制图.节奏节奏是指节奏的节奏.可编程的电刺激.在右心房的右心房.

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科学领域:

  • 电子生理学 电子生理学
  • 心脏节律失常症 心脏节律失常症
  • 心血管研究研究心血管研究

背景情况:

  • 导电阻塞 (CBs) 涉及到心房的开始和延续.
  • 由于方向或速率依赖性,CBs可以被掩盖,使诊断复杂化.

研究的目的:

  • 调查揭露右心室 (RA) 中最高数量和最严重的CB的方法.
  • 评估编程电刺激 (PES) 方向和频率对CB揭示屏的影响.

主要方法:

  • 在鼻节律 (SR) 和PES期间,在40名患者中进行高分辨率的心表图谱绘制.
  • PES从四个方向以不同的频率 (SR50,S2300,S2250,S2200) 传递.
  • 导电区块面积百分比 (CBA%) 和严重程度以局部导电时间来定义.

主要成果:

  • CBA%显著增加,从SR期间的0.6%增加到S2200期间的15.4% (P < .001).
  • 在S2200期间,CB严重程度从SR期间的18ms增加到S2200期间的46ms (P<.001).
  • 在S2200期间,PES在100%的患者中揭示了CB,在垂直和相反于SR方向的节奏时,增幅最大.

结论:

  • 与过早刺激的垂直节奏是揭开CB的最佳方式.
  • 在具有复杂SR激活模式的患者中,PES可以揭示显著的CB,并可能减少它们.