Results 21 to 30 of about 1,308,954 (287)
A Semi-Analytical Model for Separating Diffuse and Direct Solar Radiation Components
Applied Sciences, 2022 The knowledge of the solar irradiation components is required by most solar applications. When only the global horizontal irradiance is measured, this one is typically broken down into its fundamental components, beam and diffuse, by applying an ...
Eugenia Paulescu, Marius Paulescu
doaj +1 more source
Statistical analysis of the solar diffuse fraction radiation using regression analysis of longitudin
Journal of Thermal Engineering, 2023 In this study, the validity of the estimation of a single regression equation for the diffuse frac-tion across 22 stations in India using the two parameters: the clearness index and the sunshine ratio is tested.
Hicham SALHI +2 more
doaj +1 more source
The Sky-Status Climatology of Greece: Emphasis on Sunshine Duration and Atmospheric Scattering
Applied Sciences, 2022 The aim of this work is the study of the sky conditions climatology over Greece based on the diffuse-fraction (kd) limits, for clear, kd ∈ [0, 0.26]; intermediate, kd ∈ (0.26, 0.78); and overcast, kd ∈ (0.78, 1) skies.
Harry D. Kambezidis
doaj +1 more source
Mathematical Determination of the Upper and Lower Limits of the Diffuse Fraction at Any Site
Applied Sciences, 2021 A mathematical method for accurately determining the upper and lower diffuse-fraction (kd) limits that divide the sky into clear, intermediate, and overcast is developed. Fourteen sites around the world are selected for demonstrating the methodology. The
Harry D. Kambezidis +2 more
doaj +1 more source
Effects of Air Pollution on Sunshine Duration Trends in Typical Chinese Cities
Atmosphere, 2022 Long-term trends in sunshine duration in Chinese cities have been closely linked to factors caused by air pollution. To understand this impact on sunshine duration (SD), surface solar radiation from 1981 to 2020, annual PM2.5 concentration from 2012 to ...
Wei Chong +5 more
doaj +1 more source
Boundary conditions for fractional diffusion [PDF]
Journal of Computational and Applied Mathematics, 2018 This paper derives physically meaningful boundary conditions for fractional diffusion equations, using a mass balance approach. Numerical solutions are presented, and theoretical properties are reviewed, including well-posedness and steady state solutions.
Boris Baeumer +3 more
openaire +3 more sources
Fractional chemotaxis diffusion equations [PDF]
Physical Review E, 2010 We introduce mesoscopic and macroscopic model equations of chemotaxis with anomalous subdiffusion for modelling chemically directed transport of biological organisms in changing chemical environments with diffusion hindered by traps or macro-molecular crowding.
Langlands, T. A. M., Henry, B. I.
openaire +4 more sources
Numerical methods for fractional diffusion [PDF]
Computing and Visualization in Science, 2018 We present three schemes for the numerical approximation of fractional diffusion, which build on different definitions of such a non-local process. The first method is a PDE approach that applies to the spectral definition and exploits the extension to one higher dimension.
Andrea Bonito +4 more
openaire +2 more sources
Applied Sciences, 2023 The separation models are tools used in solar engineering to estimate direct normal (DNI) and diffuse horizontal (DHI) solar irradiances from measurements of global solar irradiance (GHI).
Eugenia Paulescu, Marius Paulescu
doaj +1 more source
Energies, 2022 For the various climatic zones of India, machine learning (ML) models are created in the current work to forecast monthly-average diffuse solar radiation (DSR).
Jawed Mustafa +4 more
doaj +1 more source