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Related Concept Videos

Moment-of-Momentum Equation01:09

Moment-of-Momentum Equation

The moment-of-momentum equation is a critical tool for analyzing the torque produced by the rotating blades of a wind turbine. This equation is derived by applying Newton's second law to a fluid particle, which states that the rate of change of linear momentum is equal to the external force acting on the particle.
Wind Turbine Machine Models01:24

Wind Turbine Machine Models

In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
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Gyroscope: Precession01:24

Gyroscope: Precession

Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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Updated: Jun 2, 2026

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
08:54

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

Published on: February 13, 2018

Tilting at windmills.

Yash Lokhandwala1, Mandar Shah, Gopi Krishna Panicker

  • 1Arrhythmia Associates, Mumbai, India.

The Journal of the Association of Physicians of India
|April 23, 2011
PubMed
Summary
This summary is machine-generated.

A patient experienced recurrent syncope, initially diagnosed as neurocardiogenic syncope. Electrophysiology revealed atrioventricular nodal reentrant tachycardia, successfully treated with radiofrequency ablation, resolving symptoms.

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Recurrent syncope poses a diagnostic challenge.
  • Neurocardiogenic syncope is a common, though often presumptive, diagnosis.

Observation:

  • A 69-year-old male presented with a three-year history of recurrent syncope.
  • Initial head-up tilt testing suggested a mixed response, leading to a diagnosis of neurocardiogenic syncope.
  • Conservative and pharmacologic treatments were ineffective.

Findings:

  • Electrophysiology study identified easily inducible, self-terminating atrioventricular nodal reentrant tachycardia (AVNRT).
  • Radiofrequency ablation targeting the AVNRT was performed.
  • One-year follow-up confirmed the patient remained asymptomatic.

Implications:

  • This case highlights the importance of considering cardiac causes of syncope, even with initial non-specific findings.
  • Radiofrequency ablation is an effective treatment for AVNRT-induced syncope.
  • Accurate diagnosis and targeted treatment can significantly improve patient outcomes and quality of life.