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Automatic Gain Control Model for Vision (1969)

LEVI, L.

[s.l.] : Nature Publishing Group

Nature 223 (1969), S. 396-397

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] It seems that Weber's law at high luminance can be explained far more simply and convincingly by assuming that the brightness (B) and the luminance (L) are related as _ B = B0L(x + L)-i (I) where Bo and x are constants and L is the mean luminance level. Alternatively, the "gain" may be written ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/223396b0

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Effect of structure of the wear resistance of white cast iron (1968)

Garber, M. E. ; Levi, L. I. ; Rozhkova, E. V. ; [et al.]

Springer

Metal science and heat treatment 10 (1968), S. 895-898

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ISSN: 1573-8973

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Conclusions 1. No direct relationship was found between the hardness and the wear resistance of white cast irons. 2. The wear resistance of cast iron increases with the hardness of the carbides. 3. The wear resistance of hypoeutectic chromium cast irons increases linearly with the quantity of carbides if the type of carbide does not change. An increase of the carbon concentration above the eutectic does not increase the wear resistance, since large brittle needles of hypereutectic carbides are formed. 4. The wear resistance decreases with increasing sizes of the carbides. 5. The wear resistance of white cast irons increases linearly with the hardness of the metallic base. The wear resistance is highest when the metallic base is martensitic. In some cases metastable austenite provides an equal wear resistance. Stable austenite reduces the wear resistance.