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Yolk-shelled ZnCo2O4 microspheres: Surface properties and gas sensing application
(Elsevier B.V., 2018-03-01)
The need to improve the sensitivity, selectivity and stability of ozone gas sensors capable of monitoring the environment to prevent hazard to humans has sparked research on binary metal oxides. Here we report on a novel ...
Reanalysis of monthly precipitation fields in colombian territory
(Universidad Nacional de Colombia Sede Medellín, 2014-08-26)
The historical monthly precipitation fields in Colombia are estimated and studied for the period 1975 - 2006 at a spatial resolution of 5 minutes of arc, calculated using an optimal integration of information available at ...
Sulfate and metal removal from acid mine drainage using sugarcane vinasse as electron donor: Performance and microbial community of the down-flow structured-bed bioreactor
(2021-06-01)
The down flow structured bed bioreactor (DFSBR) was applied to treat synthetic acid mine drainage (AMD) to reduce sulfate, increase the pH and precipitate metals in solutions (Co, Cu, Fe, Mn, Ni and Zn) using vinasse as ...
CO Oxidation Activity of a Au/Ceria-Zirconia Catalyst Prepared by Deposition-Precipitation with Urea
(Springer, 2011-08)
The activation of a 2.6 wt% Au/Ce0.62Zr0.38O2 catalyst prepared by deposition?precipitation with urea is investigated. At 298 K, the activity for CO oxidation of the as-prepared sample is very low; it is significantly ...
Room temperature co-precipitation of nanocrystalline CeO2 and Ce0.8Gd0.2O1.9-delta powder
(Elsevier B.V., 2007-04-01)
This paper describes a simple method to co-precipitate CeO2 and Ce0.8Gd0.2O1.9-delta with ammonium hydroxide from solvents such as: water, ethylene glycol, ethyl alcohol and isopropyl alcohol. Characterization by Raman ...
Room temperature co-precipitation of nanocrystalline CeO2 and Ce0.8Gd0.2O1.9-delta powder
(Elsevier B.V., 2007-04-01)
This paper describes a simple method to co-precipitate CeO2 and Ce0.8Gd0.2O1.9-delta with ammonium hydroxide from solvents such as: water, ethylene glycol, ethyl alcohol and isopropyl alcohol. Characterization by Raman ...
Association between climate variables and global transmission oF SARS-CoV-2
In this study, we aimed at analyzing the associations between transmission of and deaths caused by SARS-CoV-2
and meteorological variables, such as average temperature, minimum temperature, maximum temperature, ...
Conversion of an existing electrostatic precipitator casing to Pulse Jet Fabric filter in fossil power plants
(Universidad Nacional de Colombia (Sede Medellín). Facultad de Minas., 2016-01-01)
The combustion process of power generation plants originates particulates. There are different technologies to collecting particulate such as electrostatic precipitators (ESPs) or fabric filters. Currently, these ESPs take ...
Mapping seasonal and annual extreme precipitation over the Peruvian Andes
(John Wiley and Sons Ltd, 2018-12)
Seasonal and annual extreme precipitation over the Peruvian Andes have been mapped for the first time. Maps were developed using the most complete, quality-controlled and homogenous daily precipitation records in Peru from ...