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Author:
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Category : Nuclear energy
Languages : en
Pages : 326
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Book Description
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 326
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 2180
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 122
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Author:
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ISBN:
Category :
Languages : en
Pages : 24
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 124
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Book Description
Author: Defense Documentation Center (U.S.)
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ISBN:
Category : Technology
Languages : en
Pages : 1116
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 384
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Author: Armed Services Technical Information Agency (U.S.)
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Category : Aviation medicine
Languages : en
Pages : 176
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Author: United States. Air Force Personnel and Training Research Center
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Category :
Languages : en
Pages : 1316
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Author: Malcolm Mellor
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Category : Snow
Languages : en
Pages : 32
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Spectral extinction measurements for the visual range were made on homogeneous snow samples prepared under controlled conditions, with snow density and grain size as variables. Comparative measurements were made on coarse-grained natural snow. Extinction coefficient nu was in the range 0.8 to 1.7/cm for fine-grained dense snow, and 0.16 to 0.37/cm for the coarse-grained snow. In the fine-grained snow, where scattering is thought to be the dominant attenuating process, there is a general decline in nu as wavelength lambda increases from 0.4 to 0.7 microns. In the coarse-grained snow, where absorption becomes significant, spectral selection was slight, with a weak minimum in the region 0.5 to 0.6 microns. When nu is related to density it must have a maximum value; limited data for fine-grained snow show this maximum in the density range 0.45 to 0.60 g/cc, and the density for maximum extinction is inversely related to wavelength. For a given density nu decreases as grain size increases, the rate of change varying with wavelength. Spectral reflectance measurements on natural snow are reported, and attenuation data are interpreted to give surface reflectivity for fine-grained snow. Diffuse reflection from fine-grained snow is believed to have little spectral dependence in the visual range, but with coarse-grained snow reflectance is expected to become inversely dependent on wavelength. It is suggested that optical principles might be applied in the measurement of snow structure, and also for remote sensing of snow-covered terrain. (Author).
