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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions02:31

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Inductance: Single-Phase And Three-Phase Line01:28

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Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
Single-Phase Two-Wire Line:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
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Capacitance: Single-Phase And Three-Phase Line01:25

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
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Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
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Phase Changes01:19

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
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Phase-lead and Phase-lag Controllers01:22

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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Related Experiment Video

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Cooling or Warming the Esophagus to Reduce Esophageal Injury During Left Atrial Ablation in the Treatment of Atrial Fibrillation
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Phased RF Ablation: Results and Concerns.

Alexandra Kiss1, Gábor Sándorfi1, Edina Nagy-Baló1

  • 1Department of Cardiology, University of Debrecen, Debrecen, Hungary.

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|December 14, 2016
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Summary

Phased radiofrequency ablation offers a potentially faster and more contiguous lesion creation for pulmonary vein isolation in atrial fibrillation (AF) treatment compared to traditional methods.

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Area of Science:

  • Electrophysiology
  • Cardiovascular Medicine
  • Medical Devices

Background:

  • Catheter ablation is a safe and effective treatment for atrial fibrillation (AF).
  • Pulmonary vein isolation (PVI) is a key strategy in AF ablation.
  • Conventional focal radiofrequency (RF) ablation for PVI can be challenging, time-consuming, and requires advanced mapping systems.

Approach:

  • This review focuses on the phased radiofrequency (RF) ablation system.
  • The system is designed to overcome limitations of conventional point-by-point RF ablation.
  • We describe the features and summarize clinical outcomes of phased RF ablation technology.

Key Points:

  • Phased RF ablation aims to improve lesion contiguity and reduce procedure time.
  • The technology addresses challenges associated with traditional PVI methods.
  • Clinical data on the efficacy and safety of phased RF ablation is reviewed.

Conclusions:

  • Phased RF ablation presents a promising alternative for pulmonary vein isolation in AF treatment.
  • The technology may offer advantages over conventional focal RF ablation techniques.
  • Further data supports its role in improving AF ablation outcomes.