La evaluación analógica. El Proyecto DIVA.

Se explica el Proyecto DIVA (Didattica Individualizzata con Valutazione Analogica) desarrollado por el Laboratorio de Pedagogía Experimental del Departamento de Ciencias de la Educación (III Universidad de los Estudios de Roma), cuyo fin es el de reflexionar sobre los problemas derivados de la estrategia estadounidense del mastery learning. Para ello se comentan los objetivos y las fases del Proyecto DIVA, así como la experimentación del mismo .

Study of photo-assisted electrochemical degradation of carbaryl at dimensionally stable anodes (DSA (R))

This paper presents the results concerning the degradation of the pesticide carbaryl comparing two methods: electrochemical (EC) and photo-assisted electrochemical (PAEC). The experimental variables of applied current density, electrolyte flow-rate and initial carbaryl concentration were investigated. The results demonstrate that the electrochemical degradation of carbaryl was greatly enhanced when simultaneous UV light was applied. The greatest difference between the PAEC and EC method was apparent when lower current densities were applied. The extent of COD removal was much enhanced for the combined method, independent of the applied current density. It should be noted that the complete removal of carbaryl was achieved with out the need to add NaCl to the reaction mixture, avoiding the risk of chlorinated organic species formation. (C) 2009 Elsevier B.V. All rights reserved.

ELECTROCHEMICAL OXIDATION OF THE HERBICIDE TEBUTHIURON USING DSA (R)-TYPE ELECTRODE

ELECTROCHEMICAL OXIDATION OF THE HERBICIDE TEBUTHIURON USING DSA (R)-TYPE ELECTRODE. Tebuthiuron (TBH) is a herbicide widely used in different cultures and known for its toxic effects. Electrochemical methods are promising for removing pollutants such as pesticides. This study showed the degradation of TBH using a DSA (R) anode operated at current densities of 50 to 200 mA cm(-2). Removal presented pseudo-first order kinetics while high-pressure liquid chromatography (UV detection) showed two peaks, ascribed to degradation intermediates. The maximum percentage of total organic carbon removed was 12.9%. Ion chromatography revealed that higher concentrations of nitrate and nitrite ions formed with increasing current density.

Oxidação eletroquímica do herbicida tebutiuron utilizando eletrodo do tipo DSA

Tebuthiuron (TBH) is a herbicide widely used in different cultures and known for its toxic effects. Electrochemical methods are promising for removing pollutants such as pesticides. This study showed the degradation of TBH using a DSA® anode operated at current densities of 50 to 200 mA cm-2. Removal presented pseudo-first order kinetics while high-pressure liquid chromatography (UV detection) showed two peaks, ascribed to degradation intermediates. The maximum percentage of total organic carbon removed was 12.9%. Ion chromatography revealed that higher concentrations of nitrate and nitrite ions formed with increasing current density.

I valori di H1-A2 e H1-A3 come correlati della intensità "rivisitata": aspetti e problemi

Durante le lezioni si farà riferimento a questo articolo. Si deciderà poi se includerlo fra i testi obbligatori o fra i testi a libera scelta dello studente.