Gamez-Montero, P.J.; Raush, G.; Domenech, L.; Castilla, R.; M. Garcia-Vilchez; Moreno, H.; Carbó-Bech, A. Journal of technology and science education Vol. 5, num. 1 DOI: 10.3926/jotse.135 Data de publicació: 2015-01-12 Article en revista
“Mechanics” and “Fluids” are familiar concepts for any newly-registered engineering student. However, when combined into the term “Fluid Mechanics”, students are thrust into the great unknown. The present article demonstrates the process of adaptation employed by the Fluid Mechanics course in the undergraduate engineering program, along with the teaching methodology, teaching materials and results obtained, evaluating the final objectve in terms of student satisfaction and level of learning.
“Mechanics” and “Fluids” are familiar concepts for any newly-registered engineering student. However, when combined into the term “Fluid Mechanics”, students are thrust into the great unknown. The present article demonstrates the process of adaptation employed by the Fluid Mechanics course in the undergraduate engineering program, along with the teaching methodology, teaching materials and results obtained, evaluating the final objective in terms of student satsfaction and level of learning
Gamez-Montero, P.J.; Raush, G.; Domenech, L.; Castilla, R.; M. Garcia-Vilchez; Moreno, H.; Carbó-Bech, A. Congreso Internacional de Docencia Universitaria e Innovación Data de presentació: 2014-07-04 Presentació treball a congrés
‘Mecánica’ y ‘Fluidos’ son conceptos familiares para todo estudiante de Ingeniería al matricularse por primera vez. Sin embargo, su unión en ‘Mecánica de Fluidos’ la convierten en la gran desconocida. En el presente artículo se muestra el proceso de adaptación realizado por la asignatura Mecánica de Fluidos en la Ingeniería de Grado, junto con la metodología docente y herramientas didácticas utilizadas así como los resultados obtenidos en dos años académicos evaluando como objetivo final la satisfacción y nivel de aprendizaje de nuestros/as alumnos/as.
In the old mining area of Rodalquilar, mine
wastes, soil and sediments were characterized and the results revealed high concentration of Au, Ag, As, Bi,Cu, Fe, Mn, Pb, Se, Sb and Zn in tailings and sediments.
The contaminant of greatest environmental concern is As. The mean concentration in the tailings was 679.9, and 345 mg/kg in the sediments of Playazo creek. The groundwater samples from the alluvial aquifer showed
high concentration of Al, As, Cd, Fe, Hg, Mn, Ni, Pb, Se, Sb and Zn and very high concentration of chloride and sulfate, which were above the concentration defined
in the European standards for drinking water. The presence of As in groundwater may be caused by the oxidation of arsenian pyrite, the possible As desorption from goethite and ferrihydrite and the jarosite dissolution.
Groundwater concentrations of Cd, Fe, Mn, and
possibly Cu, were associated with low values of Eh, indicating the possible dissolution of oxy-hydroxides of Fe and Mn. The mobility of metals in the column experiments show the release of Al, Fe, Mn, Cr, Cu, Ni, V and Zn in significant concentrations but below the
detected values in groundwater. However, As, Cd, Sb, Se Pb and Au, are generally mobilized in concentrations above the detected values in groundwater. The possible
mass transfer processes that could explain the presence of the contaminants in the aquifer and the leachates was simulated with the PHREEQC numerical code and revealed the possible dissolution of the following mineralphases: jarosite, natrojarosite, arsenian pyrite, alunite, chlorite, kaolinite and calcite.
Smelting slags associated with base-metal vein deposits of the Sierra Almagrera area (SE Spain) show high concentrations
of Ag (<5–180 ppm), As (12–750 ppm), Cu (45–183 ppm), Fe (3.2–29.8%), Pb (511–2150 ppm), Sb (22–620 ppm) and Zn (639–8600 ppm). The slags are mainly composed of quartz, fayalite, barite, melilite, celsian, pyrrhotite, magnetite, galena and Zn–Pb–Fe alloys. No glassy phases were detected. The following weathering-related secondary phases were found: jarosite–natrojarosite, cotunnite, cerussite, goethite, ferrihydrite, chalcanthite, copiapite, goslarite, halotrichite and szomolnokite. The weathering of slag dumps near the Mediterranean shoreline has contaminated the soils and groundwater, which has caused concentrations in groundwater to increase to 0.64 mg/L Cu, 40 mg/L Fe, 0.6 mg/L Mn, 7.6 mg/L Zn, 5.1 mg/L Pb and 19 lg/L As. The results of laboratory leach tests showed major solubilization of Al (0.89–12.6 mg/L),
Cu (>2.0 mg/L), Fe (0.22–9.8 mg/L), Mn (0.85–40.2 mg/L), Ni (0.092–2.7 mg/L), Pb (>2.0 mg/L) and Zn (>2.5 mg/L), and mobilization of Ag (0.2–31 lg/L), As (5.2–31 lg/L), Cd (1.3–36.8 lg/L) and Hg (0.2–7 lg/L). The leachates were modeled
using the numerical code PHREEQC. The results suggested the dissolution of fayalite, ferrihydrite, jarosite, pyrrhotite,
goethite, anglesite, goslarite, chalcanthite and cotunnite. The presence of secondary phases in the slag dumps and contaminated soils may indicate the mobilization of metals and metalloids, and help to explain the sources of groundwater contamination.