Results 251 to 260 of about 111,378 (284)

Absolute diffuse reflectance from relative reflectance measurements

Applied Optics, 1987
A method is presented whereby any photometer than can measure relative diffuse reflectance of materials in the laboratory can be used to measure absolute diffuse reflectance of such samples without any modification to the apparatus. No additional integrating spheres or special optical geometries are required.
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Specular Reflection and Diffuse Reflectance Spectroscopy of Soils

Applied Spectroscopy, 2005
Studies on the occurrence and effects of specular reflection in mid-infrared spectra of soils have shown that distortions due to specular reflection occur for both organic (humic acid) and non-organic fractions (carbonates, silica, ashed fraction of soil).
James B, Reeves, Barry A, Francis, Stephen K, Hamilton   +2 more
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Influences Of Surface Reflection On Diffuse Reflectance Measurements

SPIE Proceedings, 1989
Abstract When the diffuse reflectance of a compact, i.e. non-particulate solid sample is measured, regular reflection at the surface cannot be avoided: external reflection occurs when the sample is irradiated, and internal reflection occurs when radiation emerges from the sample.
E.H. Korte, H. Staat
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Toward Quantitative Diffuse Reflectance: Diffuse Reflectance Without Specular Impurity.

SPIE Proceedings, 1985
Diffuse reflectance has become one of the simplest technics available to the researcher for the FT-IR analysis of powdered samples with a minimum of sample preparation. However, it is still not used widely as a quantitative tool. Papers have appeared in the literature suggesting that diffuse reflectance can indeed be used quantitatively l, but more ...
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Extended diffuse reflection model for reflectance estimation

ACM SIGGRAPH 2007 posters, 2007
Reflectance properties play an important roll in generating realistic images and a lot of research has been done to determine the reflectance of real objects from images[Sato et al. 1997]. In the process of the estimation, the Lambertian model is commonly used to estimate the diffuse reflection of real objects.
Masashi Baba, Junya Hiramatsu, Masayuki Mukunoki, Naoki Asada   +3 more
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Diffuse Reflectance Infrared Spectroscopy

Journal of Chemical Education, 1994
Diffuse reflectance offers a quick and easy-to-use alternative to the preparation of KBr pellets and Nujol mulls for the infrared spectra of solid samples; includes a comparison of spectra from both techniques.
Kenneth W. Raymond, Jeffrey A. Corkill
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Diffuse reflectivity of selenium

Materials Research Bulletin, 1967
Abstract Diffuse reflectance spectra measured for powdered specimens of monoclinic, amorphous and hexagonal selenium in the region 0.2μ to 2.0μ are compared and discussed in relation to the known absorption spectra of selenium in single crystal, amorphous bulk, vapor and solute forms. In all forms, the Se:Se bond is found to be of dominant importance.
V. Prosser, H.K. Henisch
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Diffuse Reflections from Diamond

Nature, 1941
Sir C. V. Raman and P. Nilakantan have published Laue photographs of diamond1 showing modified (111) reflections, consisting of an approximately circular diffuse spot, accompanied in certain positions by two diffuse streamers, near each Laue (111) reflection. These photographs were taken with the X-ray beam parallel, or nearly parallel, to a [111] axis,
H. A. JAHN, K. LONSDALE
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Diffuse reflectance flash photolysis

Journal of the Chemical Society, Faraday Transactions 2, 1986
Examples are given demonstrating recent progress which allows flash photolysis investigations of opaque materials by using diffuse reflectance from analysing sources for transient detection. Experimental details of a nanosecond diffuse reflectance laser flash photolysis system are presented.
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MULTIDIMENSIONAL SKEW REFLECTED DIFFUSIONS

Stochastic Analysis: Classical and Quantum, 2005
Let G ⊂ R be (non-empty) open with euclidean closure G 6= R. We assume that G is the interior of G. Let ρ ∈ L(R, dx), ρ > 0 dx-a.e., 0 ≤ α ≤ 1, and ρα := (α1G + (1 − α)1Rd\G)ρ, mα := ραdx. Let Dα = R \ G if α = 0, Dα = R if 0 < α < 1, Dα = G if α = 1.
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