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aberration

Overview page. Subjects: Physics — Medicine and Health.

n. (in optics) a defect in the image formed by an optical device (e.g. a lens). In chromatic aberration the image has coloured fringes as a result of the different extent to...

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bending moment

Overview page. Subjects: Sports and Exercise Medicine — Physics.

(about any point or section of a horizontal beam under load) The algebraic sum of the moments of all the vertical forces to either side of that point or section. See moment of a force.

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betatron

Overview page. Subjects: Physics — Medicine and Health.

(bee-tă-tron)

a device used to accelerate a stream of electrons (beta particles) into a beam of radiation that can be used in radiotherapy.

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cathode rays

Overview page. Subjects: Public Health and Epidemiology — Physics.

The stream of electrons emanating from the negative pole (cathode) of a vacuum tube when an electric current is passed through it. At very high voltages, cathode rays emit high-energy...

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cyclotron

Overview page. Subjects: Physics — Medicine and Health.

n. a machine in which charged particles following a spiral path within a magnetic field are accelerated by an alternating electric field. It produces very high-energy charged...

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elastic modulus

Overview page. Subjects: Sports and Exercise Medicine — Physics.

Ratio of stress to strain in a given material. Strain may be a change in length, a twist, or a change in volume. See also flexural rigidity, modulus of compression, modulus of rigidity,...

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fluid mechanics

Overview page. Subjects: Physics — Sports and Exercise Medicine.

A branch of mechanics concerned with the forces that fluids exert on objects that are in or moving through the fluids. The fluids most relevant to exercise and sport biomechanics are air...

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gamma camera

Overview page. Subjects: Medicine and Health — Physics.

A piece of apparatus that detects radioactivity in the form of gamma rays emitted by radioactive isotopes that have been introduced into the body as tracers. It contains an activated sodium...

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heat balance

Overview page. Subjects: Sports and Exercise Medicine — Physics.

1. A balance sheet showing all the heat inputs to a system (such as a chemical process, furnace, etc.) and all the heat outputs.

2. The equilibrium that...

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Joule heating

Overview page. Subjects: Plastic and Reconstructive Surgery — Physics.

The production of heat in a conductor as a result of the passage of an electric current through the conductor. The quantity of heat produced is given by Joule's law.

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