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Related Concept Videos

Angular Momentum01:21

Angular Momentum

Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
Torsional Pendulum01:09

Torsional Pendulum

A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
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The Anchoring-and-Adjustment Heuristic01:25

The Anchoring-and-Adjustment Heuristic

In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the $2,000...
Angular Momentum and Principle Axes of Inertia01:09

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The concept of angular momentum for a solid structure is illustrated as the cumulative result of the cross-product of the position vector of the mass element and the cross-product of the body's angular velocity with the position vector.
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Angular Momentum about an Arbitrary Axis

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Related Experiment Video

Updated: Jun 20, 2026

Inchworming: A Novel Motor Stereotypy in the BTBR T+ Itpr3tf/J Mouse Model of Autism
08:03

Inchworming: A Novel Motor Stereotypy in the BTBR T+ Itpr3tf/J Mouse Model of Autism

Published on: July 5, 2014

The Twiddling Andersen.

John L Jefferies1, Jeffrey J Kim, John W Belmont

  • 1Section of Pediatric Cardiology, Texas Children's Hospital, Houston, Texas 77030, USA. jlj@bcm.tmc.edu

Texas Heart Institute Journal
|August 21, 2009
PubMed
Summary
This summary is machine-generated.

Andersen-Tawil syndrome and Twiddler syndrome rarely co-occur. This case highlights the importance of considering both genetic and device-related complications in pediatric patients.

Keywords:
Andersen syndrome/geneticsKCNJ2 protein, humanTwiddler syndromecardiac complexes, prematuredefibrillators, implantable/adverse effectselectrodes, implanted/adverse effectsforeign-body migrationlong-QT syndrome/geneticsmandibulofacial dysostosispotassium channels, inwardly rectifying/geneticsself-injurious behavior/complicationssyncopetachycardia, ventricular/genetics

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A Tactile Automated Passive-Finger Stimulator (TAPS)
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Method to Measure Tone of Axial and Proximal Muscle
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Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

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Last Updated: Jun 20, 2026

Inchworming: A Novel Motor Stereotypy in the BTBR T+ Itpr3tf/J Mouse Model of Autism
08:03

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Published on: July 5, 2014

A Tactile Automated Passive-Finger Stimulator (TAPS)
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Published on: June 3, 2009

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10:41

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Area of Science:

  • Cardiology
  • Genetics
  • Pediatrics

Background:

  • Andersen-Tawil syndrome is a rare autosomal dominant disorder.
  • Twiddler syndrome involves manipulation of pacemaker devices.

Observation:

  • An 8-year-old girl presented with features of both syndromes.
  • This co-occurrence is highly unusual.

Findings:

  • The patient exhibited dysmorphic features, periodic paralysis, and ventricular arrhythmias.
  • The case demonstrates the potential for co-presentation of these distinct conditions.

Implications:

  • This case underscores the need for comprehensive evaluation in patients with complex cardiac and genetic conditions.
  • Awareness of this dual diagnosis can improve patient management and outcomes.