Buscar
Mostrando ítems 21-30 de 238
Effective parameters for conductive contributions to radial heat transfer in fixed beds under stagnant conditions
(Inst Chemical Engineers, 2017-03)
New expressions to evaluate the thermal conduction parameters in fixed beds of monosized spheres are presented in this paper. The parameters are those introduced by the 2R2D model proposed by Asensio et al. (2014): the ...
Vegetation and topographic controls on sediment deposition and storage on gully beds in a degraded mountain area
(2009-05)
Active gully systems developed on highly weathered or loose parent material are an important source of runoff and sediment production in degraded areas. However, a decrease of land pressure may lead to a return of a partial ...
Universal relation with regime transition for sediment transport in fine-grained rivers
(National Academy of Sciences, 2019-12-18)
Fine-grained sediment (grain size under 2,000 μm) builds floodplains and deltas, and shapes the coastlines where much of humanity lives. However, a universal, physically based predictor of sediment flux for fine-grained ...
Statistical Characterization of the Intermittency of Bedload Transport in Conditions Near the Threshold of Motion
(2015)
The dynamics of sediment particles in a flat bed channel is mainly determined by near bed coherent
structures of the turbulent boundary layer. These vortices are characterized by intense velocity
fluctuations, which ...
Structure properties and pore dynamics in aggregate beds due to wetting-drying cycles
(WILEY-V C H VERLAG GMBH, 2006-04)
Aggregate hierarchy and porosity changes in aggregate beds as a consequence of wetting-drying cycles were studied in two Andisols and one Mollisol from Chile, collected at two depths. Bulk density and indirect tensile ...
Mathematical modeling of vegetable oil-solvent extraction in a multistage horizontal extractor
(Elsevier, 2008-04)
A new mathematical model of vegetable oil extraction in an industrial De Smet type extractor is proposed. Solvent extraction from a mobile bed of oilseed material was modeled considering different availability of oil in ...
Nitrogen budget and fluxes in Colossoma macropomum ponds
(Blackwell Publishing Ltd., 2005-07-01)
This study quanti¢ed the accumulation of nitrogen (N) in the water column, sediments, ¢sh and seepage water during a production cycle of Colossoma macropomum. By combining estimates of the deposition rates of uneaten feed, ...