striation


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striation

1. an arrangement or pattern of striae
2. another word for stria (sense 1)

Striation

Fine, narrow ridges or grooves parallel to each other.

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.

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.
References in periodicals archive ?
Statistics of average striation density and total correct matching number Taurus Bryco Ruger SIG Browning Beretta Average [d.sub.s] (%) 3.66 1.41 3.9 1.51 2.23 6.86 N 18 13 24 15 17 24 The threshold length L has a significant effect on distinguishing a valid striation area from an invalid area, and it also affects the calculation of [d.sub.s].
This figure also shows characteristic pattern of primary and secondary striations. Degradation of the secondary striation pattern at the lower part of laser cut, and a greater surface waviness, are important indicators of laser cut quality.
Whereas Stalin's game players were bound by a magic circle, this did not make their play emancipative because their magic circle was dominated by the striations of universality (productivity as the only measure of success).
Ironically, Gould's "passing" as black itself questions the very racial categories the Atonists wish to secure by suggesting the possibility of racial nomadism that defies strict striation.
It is generally agreed upon that striation marks are angled away from the tire mark in the absence of braking and more in-line with the tire mark as the brakes are applied.
WS is characterised by the appearance of white striations on the pectoralis major muscle, which follow the direction of the muscle fiber [1,2].
Here, type A striation morphology of kerf walls was compared across different levels of observation in two broad types of saw.
They showed from 10 to 12 well differentiated striations, different from the clavae of non-toxic Sinaloa variety (Fig.
In practice, the angle of the striation marks will become more sensitive to braking as the slip angle increases.
It was demonstrated that for the 60/40 PP/PA6 blend, the PM domains are transformed from large particles to short striations and to small droplets finally in shear mixing, whereas the morphology develops through transitions from lamellas to thick striations and finally to a partially continuous structure in chaotic mixing.
Delicate striations of grasses aligned with the array reinforce its linear geometry and recall the site's agricultural past.
SAN DIEGO -- The best clinical predictors of adenomyosis on ultrasound are a heterogeneous myometrium, myometrial cysts, striations, and increased vascularity in the area of interest.