Striation (redirected from Striations)

striation

1. an arrangement or pattern of striae

2. another word for stria (sense 1)

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striation [strī′ā·shən]

(electronics)

A succession of alternately luminous and dark regions sometimes observed in the positive column of a glow-discharge tube near the anode.

(geology)

One of a series of parallel or subparallel scratches, small furrows, or lines on the surface of a rock or rock fragment; usually inscribed by rock fragments embedded at the base of a moving glacier.

(mineralogy)

One of a series of parallel, shallow depressions or narrow bands on the cleavage face of a mineral caused either by growth twinning or oscillatory growth of different crystal faces.

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Striation 

any one of the alternating light and dark bands occurring in the positive column of a vacuum tube during electric discharge through a gas. In some cases, the striations are static; in others they move rapidly, usually from the anode to the cathode. The bright and sharp side of each striation faces the cathode. The brightness of the striation, as a rule, diminishes in the direction of the anode. According to recent concepts, the electric field intensity and the temperature and concentration of electrons are great in the head of the striation (from the cathode side). As the electrons move in the process of diffusion from the head of the striation toward the anode, their concentration and temperature fall off to the point where ionization ceases. There is then a new jump in electric potential, and a new striation is formed.

REFERENCES

Nedospasov, A. V. “Straty.” Uspekhi fizicheskikh nauk, 1968, vol. 94, issue 3, pp. 439–62.
Pekarek, L. “Ionizatsionnye volny (straty) v razriadnoi plazme.” Uspekhi fizicheskikh nauk, 1968, vol. 94, issue 3, pp. 463–500.