Results 51 to 60 of about 10,228 (279)

Use of Measured Aerosol Optical Depth and Precipitable Water to Model Clear Sky Irradiance [PDF]

, 2017
Predicted clear sky irradiance depends on atmospheric composition as well as solar position and extra-terrestrial irradiance. The effects on clear sky irradiance of year to year variations in atmospheric composition were studied using measurements of ...
Gregory M. Kimball, Mark M. Mikofski, William F. Holmgren, Mark A. Mikofski, Clifford W. Hansen   +4 more
core   +1 more source

Impact of Stationarizing Solar Inputs on Very-Short-Term Spatio-Temporal Global Horizontal Irradiance (GHI) Forecasting

Energies
In solar forecasting, it is common practice for solar data (be it irradiance or photovoltaic power) to be converted into a stationary index (e.g., clear-sky or clearness index) before being used as inputs for solar-forecasting models. However, its actual
Rodrigo Amaro e Silva, Llinet Benavides Cesar, Miguel Ángel Manso Callejo, Calimanut-Ionut Cira   +3 more
doaj   +1 more source

From Photoalignment to Structured Light: Liquid Crystal Platforms for Beam Shaping and Complex Wavefronts

Advanced Functional Materials, EarlyView.
Photoaligned and photopatterned liquid crystal platforms provide programmable control of optical phase, polarization, and spin‐orbit interactions, enabling compact generation of structured light and complex wavefronts. This review highlights how tailored molecular orientations transform simple beams into designed optical fields, opening versatile ...
Le Zhou, Tingjun Zhong, Sijie Liu, Pouya Nosratkhah, Ke Xu, Yuzhen Zhao, Kristiaan Neyts   +6 more
wiley   +1 more source

Evaluation of the Relationship between Air and Land Surface Temperature under Clear- and Cloudy-Sky Conditions [PDF]

, 2011
Clear and cloudy daytime comparisons of land surface temperature (LST) and air temperature (Tair) were made for 14 stations included in the U.S. Climate Reference Network (USCRN) of stations from observations made from 2003 through 2008.
Robert Hale, Kevin Gallo, Dan Tarpley, Yunyue Yu   +3 more
core   +1 more source

Estimation of Clearness Index and its Application in Determining Sky Conditions using Three Cities in Ghana as a Case Study

Indian Journal of Environment Engineering, 2022
In this work, hourly global radiation and extraterrestrial data for three locations in Ghana, namely Accra, Kumasi, and Navrongo, were used to estimate the daily clearness, monthly mean clearness index, and monthly-averaged hourly clearness index of the study areas. It was observed that the monthly average clearness index of Accra ranged from 0.4505 to
Ralph Osei Dartey, Bobie Ansah Samuel, Chigbo A. Mgbemene, Ekechukwu Onyemaechi Valentine   +3 more
openaire   +1 more source

An Edible Chitosan‐Based Acoustic Sensor for Sound‐Responsive Actuation in Edible Robots

Advanced Functional Materials, EarlyView.
This study introduces an edible acoustic sensor for robotic food and edible robotics. Built from a chitosan piezoelectric film between gold electrodes, the sensor enables acoustic communication through ON/OFF keying. Integrated into an edible robot with pneumatically actuated arms and neck, it responds to high‐frequency tones.
Valerio Francesco Annese, Bokeon Kwak, Gaia de Marzo, Giulia Coco, Valentina Antonaci, Leonardo Lamanna, Massimo De Vittorio, Dario Floreano, Mario Caironi   +8 more
wiley   +1 more source

Air pollution is pushing wind speed into a regulator of surface solar irradiance in China

Environmental Research Letters, 2014
Analysis in 27 cities across China shows that surface solar irradiance (SSI) and wind speed track similar decadal trends in 1961–2011, suggesting wind speed as a possible regulator of SSI. This assumption is further confirmed by the continuously widening
Y W Wang, Y H Yang, X Y Zhou, N Zhao, J H Zhang   +4 more
doaj   +1 more source

Análise da frequência anual das condições de céu em Botucatu, São Paulo Analysis of the annual frequency of the sky conditions in Botucatu, São Paulo

Revista Brasileira de Engenharia Agrícola e Ambiental, 2012
Este trabalho apresenta uma análise da frequência das condições de céu em Botucatu. A classificação das condições de céu foi feita com base no índice de claridade (K T), calculado a partir de uma base de dados de 10 anos de radiação global diária.
Érico T. Teramoto, João F. Escobedo
doaj   +1 more source

An Electrowetting Pump

Advanced Functional Materials, EarlyView.
A tubular electrowetting pump moves alternating droplets through a millimeter‐wide channel in discrete, reversible steps, functioning as a fluidic stepper motor. With no moving parts and electrodes insulated from the liquid, it delivers silent, accurate flow. Flexibility allows the pump to be woven directly into textiles for wearable, medical, and soft‐
Robert Hennig, Herbert Shea
wiley   +1 more source

A Satellite-Based Sky Luminance Model for the Tropics

International Journal of Photoenergy, 2013
This paper presents a sky luminance model for the tropics. The model is mathematically expressed as a multiplication of two functions. These are φ, which is a function of the zenith angle of a sky element and solar zenith angle, and f, which is a ...
Serm Janjai
doaj   +1 more source