Results 21 to 30 of about 52,709 (270)

Proximal hyperspectral analysis in grape leaves for region and variety identification

Ciência Rural, 2023
: Reflectance measurements of plants of the same species can produce sets of data with differences between spectra, due to factors that can be external to the plant, like the environment where the plant grows, and to internal factors, for measurements of
Diniz Carvalho de Arruda, Jorge Ricardo Ducati, Rosemary Hoff, Tássia Fraga Belloli, Adriane Brill Thum   +4 more
doaj   +1 more source

Plant canopy shape and the influences on UV exposures to the canopy [PDF]

, 1996
The solar spectra at selected sites over hemispherical, conical and pinnacle plant canopy models has been evaluated with a dosimetric technique. The irradiance at the sites varies by up to a factor of 0.31 compared to the irradiance on a horizontal plane.
Caldwell M. M., Caldwell M. M., Coohill T. P., Parisi A. V., Tate T. J., Teramura A. H., Tevini M., Tevini M., Wong C. F.   +8 more
core   +2 more sources

Experimental Evaluation of a Spectral Index to Characterize Temporal Variations in the Direct Normal Irradiance Spectrum

Applied Sciences, 2021
A simple index is desirable to assess the effects on both flat-plate and concentrating photovoltaics of natural changes in the solar spectrum. Some studies have suggested that the relationship between the Average Photon Energy (APE) and the shape of ...
Gustavo Nofuentes, Christian A. Gueymard, José A. Caballero, Guilherme Marques-Neves, Jorge Aguilera   +4 more
doaj   +1 more source

Use of consumer-grade cameras to assess wheat N status and grain yield [PDF]

, 2019
Relationships between (a) fractional Intercepted PAR (fIPAR), and (b) aboveground biomass (Biomass) and (c) grain yield at harvest with the Normalized Difference Vegetation Index (NDVI) derived either from a spectroradiometer or a conventional camera at ...
Fernández Murcia, Enric, Gorchs Altarriba, Gil, Serrano Porta, Lydia   +2 more
core   +4 more sources

Patterns in the received facial UV exposure of school children measured at a subtropical latitude [PDF]

, 2008
Polysulphone dosimeters have been employed to measure the erythemally effective UV exposure to the vertex, nose, cheek, chin and side facial sites of 45 volunteer high school students from Hervey Bay, Australia (25.3oS 152.9oE).
Downs, Nathan, Parisi, Alfio
core   +2 more sources

Incorporating a Hyperspectral Direct-Diffuse Pyranometer in an Above-Water Reflectance Algorithm

Remote Sensing, 2022
In situ hyperspectral remote-sensing reflectance (Rrs(λ)) is used to derive water quality products and perform autonomous monitoring of aquatic ecosystems.
Thomas M. Jordan, Stefan G. H. Simis, Philipp M. M. Grötsch, John Wood   +3 more
doaj   +1 more source

Characterization of a Field Spectroradiometer for Unattended Vegetation Monitoring. Key Sensor Models and Impacts on Reflectance

Sensors, 2015
Field spectroradiometers integrated in automated systems at Eddy Covariance (EC) sites are a powerful tool for monitoring and upscaling vegetation physiology and carbon and water fluxes.
Javier Pacheco-Labrador, M. Pilar Martín   +1 more
doaj   +1 more source

Shade Selection, a Key to Esthetics

Journal of International Clinical Dental Research Organization
One of the most difficult steps in restorative dentistry can be precisely matching natural teeth with an artificial restoration. Natural teeth come in a variety of shapes and hues.
Shruti Deepak Jadhav, Varsha Sanjay Pandit, Ashwini Avinash Gaikwad, Vinaya Prabhanjan Ingale, Rajlaxmi Pradeep Patil, Mineet Satish Kaul   +5 more
doaj   +1 more source

Using Ridge Regression Models to Estimate Grain Yield from Field Spectral Data in Bread Wheat (Triticum Aestivum L.) Grown under Three Water Regimes

Remote Sensing, 2015
Plant breeding based on grain yield (GY) is an expensive and time-consuming method, so new indirect estimation techniques to evaluate the performance of crops represent an alternative method to improve grain yield. The present study evaluated the ability
Javier Hernandez, Gustavo A. Lobos, Iván Matus, Alejandro del Pozo, Paola Silva, Mauricio Galleguillos   +5 more
doaj   +1 more source

Estimating the irradiance spectrum from measurements in a limited number of spectral bands

, 2006
Accurate measurement and characterisation of fluctuations in the irradiance environment is important for many areas of optical remote sensing. This paper describes a method of estimating spectral irradiance over the region 400 – 1000 nm from the radiance
Milton, E.J., Rollin, E.M.
core   +1 more source