Results 11 to 20 of about 44,664 (309)

The interpretation of diffuse reflectance spectra

open access: yesJournal of Research of the National Bureau of Standards Section A: Physics and Chemistry, 1976
Numerous treatments of the diffuse reflecting properties of scattering media have been described. Many theories give an adequate account of the reflectance for a specific set of conditions for which the model was constructed and the solution tested experimentally. Only those models which are considered to be fairly general are considered here.
Hecht, Harry G.
openaire   +3 more sources

DIFFUSE REFLECTANCE MEASUREMENTS FROM DIFFERENT SURFACES [PDF]

open access: yesJournal of Sciences, Islamic Republic of Iran, 2001
Relative diffuse reflection measurements from the original and ground surfaces using a He-Ne laser are reported. The intensity measurements for the metallic, transparent dielectric, matte plastic surfaces and colored papers are presented.
doaj   +1 more source

ReDDLE-Net: Reflectance Decomposition for Directional Light Estimation

open access: yesPhotonics, 2022
The surfaces of real objects can visually appear to be glossy, matte, or anywhere in between, but essentially, they display varying degrees of diffuse and specular reflectance.
Jiangxin Yang   +6 more
doaj   +1 more source

Reflectometers for Absolute and Relative Reflectance Measurements in the Mid-IR Region at Vacuum

open access: yesSensors, 2021
We demonstrated spectral reflectometers for two types of reflectances, absolute and relative, of diffusely reflecting surfaces in directional-hemispherical geometry.
Jinhwa Gene, Min Yong Jeon, Sun Do Lim
doaj   +1 more source

Analysis of petroleum-contaminated soils by diffuse reflectance spectroscopy and sequential ultrasonic solvent extraction-gas chromatography [PDF]

open access: yes, 2014
In this study, we demonstrate that partial least-squares regression analysis with full cross-validation of spectral reflectance data estimates the amount of polycyclic aromatic hydrocarbons in petroleumcontaminated tropical rainforest soils.
Mouazen, Abdul Mounem   +2 more
core   +1 more source

Monitoring real time polymorphic transformation of sulfanilamide by diffuse reflectance visible spectroscopy [PDF]

open access: yes, 2016
This study investigated the development of a novel approach to surface characterisation of drug polymorphism and the extension of the capabilities of this method to perform ‘real time’ in situ measurements.
Mitchell, John C.   +11 more
core   +1 more source

Carbon Nanotube (CNT) Honeycomb Cell Area-Dependent Optical Reflectance

open access: yesNanomaterials, 2016
The relationship between the physical structure of carbon nanotube (CNT) honeycomb structures and their total, diffuse, and specular reflectance is investigated for the first time.
Junthorn Udorn   +2 more
doaj   +1 more source

Diffuse Reflectance Spectroscopy of the Oral Mucosa: In Vivo Experimental Validation of the Precancerous Lesions Early Detection Possibility

open access: yesDiagnostics, 2023
This article is devoted to the experimental validation of the possibility of early detection of precancerous lesions in the oral mucosa in vivo using diffuse reflectance spectroscopy in the wavelength range from 360 to 1000 nm. During the study, a sample
Alexander V. Kolpakov   +10 more
doaj   +1 more source

On reflected diffusions in cones and cylinders

open access: yesUkrains’kyi Matematychnyi Zhurnal, 2023
UDC 519.21 Let X be a diffusion in a cone with oblique reflection at the boundary. We study the question whether X reaches a vertex of the cone for a finite time with positive probability. We propose new probabilistic method of investigation connected with the long-term  behavior of a diffusion reflected in a cylinder.
Kulyk, Oleksii   +2 more
openaire   +1 more source

Near infrared reflectance spectroscopy compared with soil clay and organic matter content for estimating within-field variation in N uptake in cereals [PDF]

open access: yes, 2008
Adjusting fertiliser applications to within-field variations in nitrogen (N) mineralisation during the growing season can increase yields, improve crop quality, reduce costs and decrease nutrient losses to the environment. Predicting such variations at a
Stenberg, Bo   +2 more
core   +1 more source

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