striation

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Related to Striations: Glacial striations

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 ?
2 times as long as wide, with median longitudinal carina medially, posterior margin slightly concave, striations on surface dense, oblique.
As the crack propagates, two kinds of striations, that is, compact and rough striations, generate as a consequence of interaction of shear bands with the crack surface and the distinct appearance of this striation morphology indicates the ductile impact fracture of the sample (43).
Chondrichthyan egg capsules with longitudinal striations have been described for species within several scyliorhinid genera, including Apristurus (Nakaya 1975; Springer 1979; Ebert et al.
I personally adore many groups within Richter's squeegee abstractions including the three 849 paintings from 1997 with their purple tones and peeled-away patches, and the jewel-like eight-part 858 series which were made on small aluminium panels so as to produce hair-thick striations of an unbelievable colour range.
The number and width of striations in a land impression can vary depending on the size of the bullet and the characteristics of the barrel.
The peels provide negative impressions so that pits and striations appear as raised features.
They made the diagnosis of adenomyosis on the basis of seven different ultrasound findings: an enlarged and globular uterus, a heterogeneous myometrium, myometrial cysts, a difference in the anteroposterior myometrial thickness, endomyometrial striations, loss of the endomyometrial junction, and myometrial hypervascularity.
the deutonymph was slightly larger than the protonymph, pale yellow in colour and well ornamented with striations and setae.
AMS cribellum cribellum cribellum Cribellum divided divided divided PMS present present present paracribellar spigots PLS modified present present present spigot (amaurobiid PLS spigot of Wang 2000) Chilum single single single Trichobothria transverse transverse transverse base, large hood striations Trichobothria striated striated striated base, small hood striations Tracheal four simple four simple four middle tubes tubes simple tubes (Griswold tubes et al.
The striations of RidgeBamboo, created using a proprietary process, provide a robust, sturdy surface that ages gracefully and requires little maintenance.
She was fascinated and watched for more than 20 minutes during which time, flapping its wings, it worked further up the four foot window, beak butting it thousands of times until it had covered the whole of the window with white striations.