Results 211 to 220 of about 301,541 (264)
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Journal of the Optical Society of America, 1953
A form of ultraviolet microscope of the refracting type is described in which the source of radiation is a spark gap between fixed or rotating electrodes and the objectives are normally monochromats. The microscope is horizontal, thus avoiding the use of a mirror, and the fine motion mechanism responds to movements of 0.10 micron. Phase contrast may be
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A form of ultraviolet microscope of the refracting type is described in which the source of radiation is a spark gap between fixed or rotating electrodes and the objectives are normally monochromats. The microscope is horizontal, thus avoiding the use of a mirror, and the fine motion mechanism responds to movements of 0.10 micron. Phase contrast may be
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Photodermatology, Photoimmunology & Photomedicine, 2006
Both types of Ultraviolet (UV), UVB (290–320 nm) and UVA (320–400 nm), produce increased pigmentation or tanning. However, no evaluation of UVA alone in the treatment of vitiligo has been reported. Therefore, it was the purpose of this work to study the pigmentogenic effect of UVA (5 and 15 J/cm2) in vitiligo.
Medhat, El-Mofty +6 more
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Both types of Ultraviolet (UV), UVB (290–320 nm) and UVA (320–400 nm), produce increased pigmentation or tanning. However, no evaluation of UVA alone in the treatment of vitiligo has been reported. Therefore, it was the purpose of this work to study the pigmentogenic effect of UVA (5 and 15 J/cm2) in vitiligo.
Medhat, El-Mofty +6 more
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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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Canadian Journal of Research, 1948
A photometer for use in the near ultraviolet has been designed and built with particular attention to simplicity, ruggedness, and reliability.
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A photometer for use in the near ultraviolet has been designed and built with particular attention to simplicity, ruggedness, and reliability.
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Generation of Ultraviolet and Vacuum Ultraviolet Radiation
1974The paper describes the use of nonlinear optical techniques for the generation of coherent radiation at ultraviolet, vacuum ultraviolet, and soft x-ray wavelengths. Mixtures of metal vapors and inert gases, and other mixed gas systems, allow generation to regions of the spectrum where nonlinear optical crystals are opaque; and also allow generation at ...
S. E. Harris +4 more
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Ultraviolet and Vacuum Ultraviolet Systems
Optica Acta: International Journal of Optics, 1983openaire +2 more sources