Results 311 to 320 of about 979,962 (353)
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Applied Spectroscopy, 1966
The reading of wavelengths (or wave numbers) at which maxima occur in ultraviolet spectroscopic analysis on a Cary model 11 recording spectrophotometer can be greatly simplified by the use of an “ultraviolet ruler.” The ruler obviates the necessity of having to count wavelengths on recorder paper in which the abscissa is not graduated and on which only
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The reading of wavelengths (or wave numbers) at which maxima occur in ultraviolet spectroscopic analysis on a Cary model 11 recording spectrophotometer can be greatly simplified by the use of an “ultraviolet ruler.” The ruler obviates the necessity of having to count wavelengths on recorder paper in which the abscissa is not graduated and on which only
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Photochemical & Photobiological Sciences, 2010
The chemistry, photostability and mechanism of action of ultraviolet filters are reviewed. The worldwide regulatory status of the 55 approved ultraviolet filters and their optical properties are documented. The photostabilty of butyl methoxydibenzoyl methane (avobenzone) is considered and methods to stabilize it in cosmetic formulations are presented.
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The chemistry, photostability and mechanism of action of ultraviolet filters are reviewed. The worldwide regulatory status of the 55 approved ultraviolet filters and their optical properties are documented. The photostabilty of butyl methoxydibenzoyl methane (avobenzone) is considered and methods to stabilize it in cosmetic formulations are presented.
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Dependence of ultraviolet absorbers' performance on ultraviolet wavelength
Polymer Degradation and Stability, 2008Abstract So far, ultraviolet absorbers (UVA) have been discussed mainly on the basis of the extinction coefficient ( ɛ ), and the light degradation of polymeric materials is explained by photolysis of hydroperoxides and Norrish reactions of ketones. This study focuses on the photo-antioxidant ability as characteristic which UVA must possess for the ...
Yoshiyuki Dobashi, Yasukazu Ohkatsu
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Ultraviolet Albedo of the Moon with the Hopkins Ultraviolet Telescope
The Astrophysical Journal, 1995During the 1995 March flight of the Hopkins Ultraviolet Telescope, as part of the Astro-2 Space Shuttle mission, we observed the Moon over the wavelength range 820-1840 A, with a resolution of 3-4 A, finding the ultraviolet albedo of the Moon to be 0.038 ± 0.0038 at 1700 A.
Richard C. Henry +4 more
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STANDARDIZATION OF ULTRAVIOLET RAYS
Journal of the American Medical Association, 1926Heliotherapy has gained more and more advocates among the medical profession in the last few years. There is no denying the fact that ultraviolet radiation intelligently used in favorable cases has shown encouraging results. The amount of radiation administered in a single treatment or the total energy applied in a series of treatments varies widely ...
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Ultraviolet Microscopy and Ultraviolet Microspectroscopy
1953Elkan R. Blout, Elkan R. Blout
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2013
The ultraviolet comprises high frequency radiation adjacent to the blue hues of the visible portion of the electromagnetic spectrum. Two factors limit our use of the ultraviolet. First, atmospheric scattering is severe in the ultraviolet, making photographs fuzzy and of low contrast.
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The ultraviolet comprises high frequency radiation adjacent to the blue hues of the visible portion of the electromagnetic spectrum. Two factors limit our use of the ultraviolet. First, atmospheric scattering is severe in the ultraviolet, making photographs fuzzy and of low contrast.
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2014
: Advances in deep ultraviolet (DUV) light-emitting diodes (LEDs) fabricated using wide-bandgap AlGaN-based semiconductors are described. Crystal growth techniques for wide-bandgap AlN- and AlGaN-based semiconductors have been developed and used to produce 220–350 nm-band DUV-LEDs.
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: Advances in deep ultraviolet (DUV) light-emitting diodes (LEDs) fabricated using wide-bandgap AlGaN-based semiconductors are described. Crystal growth techniques for wide-bandgap AlN- and AlGaN-based semiconductors have been developed and used to produce 220–350 nm-band DUV-LEDs.
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