striation


Also found in: Dictionary, Thesaurus, Medical, Financial, Wikipedia.

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 ?
Near the notch, a characteristic of the fractured surface is the formation of compact "fish bone" striations perpendicular to the direction of crack propagation (as shown in Fig.
Firearms often leave unique microscopic striation marks on fired bullets.
Namely, recently it was found that bucco-pharyngeal denticles of Phlebolepis elegans Pander were covered with the same type of ultrasculpture of fine longitudinal striation as the scales of the squamation (unpublished data by M.
Following Deleuze and Guattari, one might argue that not only are the Atonist efforts to striate all space unable to contain Jes Grew, but, ultimately, the effort at striation in this case has the reverse effect and actually "emits new smooth spaces" (500), or at least those spaces at the crossroads that defy the one-way logic the Atonists wish to impose on all peoples and places.
5Nb pressure tube materials, fractographic features called striations were absent in all tested cladding materials.
While the experimentally obtained samples show more complex mixing features compared to the numerical results, one can identify similar trends when looking at the striation formation in both.
One might want to ensure, for example, that there exists some specified upper bound for the maximum striation thickness, even in the worst-mixed region; this is often a requirement when mixing pigments into plastics.
In a typical single-screw extruder, the mixture is generally present in the form of striations or lamellar structure at the initial stage (feed zone) and the striation thickness reduction quantifies the degree of mixing.
The change in the volume of a layer of the rubber compound in the barrel during a particular time interval is the same as the volume of polymer flowing along that striation in the capillary die.
The main foyer channels directly into the eastern striation which combines exhibition and reading rooms with generous circulation spaces.
1, the striation thickness distribution for an impingement T-mixer in reaction injection molding was calculated using the statistical theory of turbulent diffusion.
These second order indicator minerals line up in four distinct glacial trains, as confirmed by striation measurements: