http://hdl.handle.net/2117/3680 2013-05-23T23:45:43Z http://hdl.handle.net/2117/19365 Title: Apoyo institucional del ICE-UPC a las dinámicas de innovación docente: Proyecto RIMA Authors: Martínez Martínez, María del Rosario; Salán Ballesteros, Maria Núria; Adam, Araceli; Darnell, Isabel; Corral Manuel de Villena, Ignacio de; Gallego Fernández, María Isabel; Portet Cortés, Esperanza; Torra Bitlloch, Immaculada Abstract: En los últimos años, desde el Instituto de Ciencias de la Educación de la Universidad Politécnica de Cataluña (ICE - UPC), se ha incentiva do l a Innovación Docente mediante múltiples iniciativas. Desde 2007, con la creación del Proyecto RIMA (Investigación e Innovación en Metodologías de Aprendizaje - Recerca i Innovació en Metodologies d’Aprenentatge) y de su entorno virtual asociado (www.upc.ed u/rima), el apoyo a la innovación docente se completa con un proyecto coordinado, que facilita la confluencia de esfuerzos de grupos de profesorado con interés en este ámbito. En la presente comunicación y partiendo de los resultados y experiencias de los últimos años en adaptación e implantación de metodologías de innovación docente en la UPC, se realiza una reflexión sobre la acogida e incidencia de esta iniciativa en la adaptación a los nuevos planes de estudio del Espacio Europeo de E ducación Superior ( EEES), y en el planteamiento de nuevos objetivos institucionales referidos tanto al tema de la participación en innovación docente como a las nuevas metodologías y a la mejora de la calidad docente. 2013-05-21T17:25:49Z http://hdl.handle.net/2117/19117 Title: Some experiences related to innovation methodologies within the university classroom Authors: Amante García, Beatriz; Martínez Martínez, María del Rosario 2013-05-07T11:07:59Z http://hdl.handle.net/2117/19115 Title: Towards methodological improvement in the Spanish studies Authors: Amante García, Beatriz; Martínez Martínez, María del Rosario 2013-05-07T10:51:03Z http://hdl.handle.net/2117/19114 Title: A proposal to improve your evaluation skills Authors: Amante García, Beatriz; Martínez Martínez, María del Rosario 2013-05-07T10:19:24Z http://hdl.handle.net/2117/18862 Title: Multidisciplinary study of tutoring using virtual characters and second life Authors: Amante García, Beatriz; Campo Sud, David del; Martínez Martínez, María del Rosario Abstract: In this article we present the planning and methodology followed in order to apply virtual tutoring sessions in different subjects and universities. The Second Life environment, together with the Voki speaking avatars will be employed. It is a multidisciplinary study that includes personal and collective tutoring sessions, answering key questions through animated avatars, virtual labs, and posters exhibition for peer-evaluation. From a survey run among the students it is concluded that most of them are willing to learn and try this kind of tutoring sessions, but at the same time some feel skeptical about its utility 2013-04-18T10:23:24Z http://hdl.handle.net/2117/18676 Title: Thorium sorption onto magnetite and ferrihydrate in acidic conditions Authors: Rojo, I.; Seco, F.; Rovira, M.; Giménez Izquierdo, Francisco Javier; Cervantes, G.; Martí Gregorio, Vicenç; De Pablo Ribes, Joan Abstract: Sorption of Th(IV) onto two-line ferrihydrite and magnetite in NaClO4 solutions has been studied as a function of pH and ionic strength revealing that sorption onto both solids increases with pH while it is independent on ionic strength. Sorption capacity of both solids is high, the maximum sorption (almost 100% of Th(IV)) occurs at pH higher than 3.5 for ferrihydrite, and higher than 3.0 for magnetite. Sorption variation with pH was modeled with three different models using the FITEQL 4.0 code: non-electrostatic model, constant capacitance model, and diffuse-double layer model. In all cases, good fit to the experimental data is obtained with one-species: a corner-sharing bidentate-mononuclear surface complex, (triple bond; length of mdashFeO)2Th2+, which coincides with the surface complex postulated on these solids surface in previous spectroscopic studies; however, the monodentate species triple bond; length of mdashFeOThOH2+ also gives a satisfactory fit. Under the experimental conditions of the present study, any effect of possible thorium colloid formation is negligible. 2013-04-08T09:20:06Z http://hdl.handle.net/2117/18643 Title: Secondary phase formation on UO2 in phosphate media Authors: Rey, A.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Clarens, F.; De Pablo Ribes, Joan Abstract: he dissolution of UO2 (a chemical analog of uraninite and of spent nuclear fuel) has been studied by using a flow-through reactor. The UO2 dissolution rates at total View the MathML source concentrations of 10−4, 10−5, and 10−6 mol dm−3 have been determined to be: 1.3 × 10−10 mol m−2 s−1, 6.7 × 10−11 mol m−2 s−1, and 2.0 × 10−11 mol m−2 s−1, respectively. The dissolution rates determined are found to be higher than the ones determined for similar carbonate concentrations. Moreover, the surface of the UO2 has been studied in static tests by means of the scanning force microscopy technique (SFM) in order to follow the formation of any secondary solid phase on its surface. The formation of chernikovite (H2(UO2)2(PO4)2 · 8H2O) has been observed at a 10−4 M total View the MathML source concentration, while no uranyl-phosphate secondary phases have been found at lower View the MathML source concentrations. In experiments performed in the presence of both carbonate and phosphate, no precipitation of secondary phases has been observed. It is postulated that this is due to the formation of the highly stable uranyl-carbonate complexes in solution. 2013-04-05T11:20:49Z http://hdl.handle.net/2117/17583 Title: GREDIQ-RIMA: The evolution of a teaching project of experimentation in chemistry Authors: Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María del Rosario; Calvet Tarragona, Aureli; Farran Marsà, Adriana; Salán Ballesteros, Maria Núria; Álvarez del Castillo, María Dolores; Gorchs Altarriba, Roser; Almajano Pablos, María Pilar; Morillo Cazorla, Margarita; Garrido Soriano, Núria Abstract: Authors of this project belong to the Resources Chemistry Teaching Group (GReDiQ) involved in RIMA (Research and innovation in learning methodologies). The audiovisual and multimedia material productions realized have been grouped into three themes: Basic Techniques of Experimentation in Chemistry, Safety in Chemistry Laboratories and Advanced Techniques of Experimentation in Chemistry. This work has been awarded a prize of the Universitat Politècnica de Catalunya (UPC–BARCELONATECH), one of the Autonomous Region of Catalunya and another one of a State scope 2013-02-05T15:33:21Z http://hdl.handle.net/2117/17340 Title: Ammonia removal from water by liquid-liquid membrane contactor under closed loop regime Authors: Licon Bernal, Edxon Eduardo; Casas Garriga, Sandra; Alcaraz, Aurora; Cortina Pallás, José Luís; Valderrama Angel, César Alberto Abstract: Ammonia separation from water by a membrane contactor was simulated on transient state and compared with experimental data. Aqueous low concentrated solution of ammonium with high pH has been pumped inside a hydrophobic hollow fiber (lumen), sulfuric acid solution in the outside part and the feeding solutions are in closed loop configuration. In order to simulate the separation process, the equations were developed considering radial and axial diffusion and convection in the lumen with a well-developed parabolic velocity profile. The model proposed shows minimal deviations when is compared against experimental data. This study shows that the most important parameters to control during the operation are the flow rate and the pH, mainly the last one, due to high dependence in chemical equilibrium of ammonium reaction to ammonia. 2013-01-14T13:46:43Z http://hdl.handle.net/2117/17137 Title: Binary fixed bed modeling of phenol/aniline removal from aqueous solutions onto hyper-cross-linked resin (Macronet MN200) Authors: Valderrama Angel, César Alberto; Poch Garcia, Jordi; Barios, Joan I.; Farran Marsà, Adriana; Cortina Pallás, José Luís Abstract: The sorption performance of hyper-cross-linked Macronet resin (MN200) to remove phenol and aniline from aqueous solution has been evaluated. Fixed bed column experiments were undertaken to obtain the breakthrough curves in both single and binary solutions. The film-surface diffusivity model has been used to predict the single (phenol and aniline) fixed bed breakthrough curves by using the Langmuir and Freundlich single isotherm data to represent the equilibrium. A good description of the experimental data has been obtained by both isotherms, and the mass transfer coefficient and the surface diffusivity have been obtained as optimized parameters for both solutes. The binary breakthrough curve prediction has been performed by the film surface diffusion model, incorporating an equilibrium relationship defined by the extended Langmuir isotherm model and the ideal sorbed solution theory (IAST). The sum of square errors (SSE) obtained for the IAST approach confirms the good agreement between the experimental and the predicted breakthrough data and the deviation obtained for the extended Langmuir model. The surface diffusivities in binary sorption reported a significant difference to those obtained in a single system, indicating that binary sorption is mainly controlled by the intraparticle diffusion. 2012-12-17T15:33:28Z http://hdl.handle.net/2117/16987 Title: Chloride reduction from brackish water by supported liquid membranes using ionic liquids as carriers Authors: Benito, Sergi; Fortuny Sanromá, Agustín; Coll Ausió, Mª Teresa; Sastre Requena, Ana María Abstract: The desalinization of the continental waters is one of the actual challenges on supplying water requirements. Water with high contents in salts is inadequate for drinking water and irrigation uses. In the industry this water involves additional conditioning steps. Salinity in water can determine the aquatic ecosystem and the life of the pants. High concentration of chloride in continental water is a great problem for the exploitation of these natural resources. In general, Cl- in water can be reduced by conventional water treatment processes, like ion exchange or reverse osmosis, but for long scale production these techniques could be very expensive due to resins regeneration or energy costs. This work proposes an alternative solution to chloride reduction from brackish water. The possibility to exchange Cl- to HCO3- anion on a supported liquid membrane using Aliquat 336, Cyphos IL 101 and Cyphos IL 167 as a carriers have been demonstrated. Experimental liquid liquid extraction process has been taken into account to determinate the stability and the easiness of the anion exchange. Alternating HCO3- 1M, and 1000 mg/L of Cl- contacts with the organic phase during fifteen extraction-regeneration cycles, no change in the results have been observed. 2012-11-21T11:30:32Z http://hdl.handle.net/2117/16781 Title: Toxicity of metal-ethylenediaminetetraacetic acid solution as a function of chemical speciation:An approach for toxicity assessment Authors: Peraferrer, C.; Martínez Martínez, María del Rosario; Poch García, Jordi; Villaescusa Gil, Isabel Abstract: The influence of complexation by ethylenediaminetetraacetic acid (EDTA) on the toxicity of Cd(II), Cu(II), Cd(II), and Ni(II) was investigated. Result of the Microtox test, which is based on measuring the decrease of light emitted by Vibrio fischeri bacterium when exposed to a toxicant, was used as an indication of toxicity. The effect of pH and EDTA molar ratio that might potentially modify the percentage of chemical species in solution on toxicity was evaluated. In general, results indicate that toxicity decreases when increasing the pH value as well as the EDTA molar ratio. Chemical modeling was used to predict metal speciation and correlation analysis to relate chemical species with the obtained toxicity results. The species that most contribute to toxicity resulted to be MeCl? (Me = metal), which is formed as a consequence of the presence of the bioassay medium (2 % NaCl). A model that predicts metal-solution toxicity by using the chemical species, whichmost contribute to toxicity is proposed as a useful tool for toxicity assessment in waters containing metal ions and EDTA. 2012-10-23T10:57:52Z http://hdl.handle.net/2117/16513 Title: Use of methyltrioctyl/decylammonium bis 2,4,4-(trimethylpentyl)phosphinate ionic liquid (ALiCY IL) on the boron extraction in chloride media Authors: Fortuny Sanromá, Agustín; Coll Ausió, Mª Teresa; Sastre Requena, Ana María Abstract: Recent restriction of boron concentration in drinking water has produced some problems in the seawater desalinization plants because the rejection of boron in most of the plants is inadequate. Three ionic liquids derived from Cyanex 272 as an anion with different cations (from Aliquat 336, Cyphos IL 101 and Cyphos IL 167) were prepared to be used as boron extractants. Liquid–liquid extraction experiments were carried out to evaluate the viability of boron separation from high chloride media. The effect of ILs and boron concentration and pH were determined. Successive extractions, maintaining the organic phase, provided satisfactory results in order to implement these ILs on supported liquid membrane technologies. The use of the ionic liquid as a carrier can overcome the inconvenience associated with the membrane stability. In this sense, the ionic liquids ALiCY and the mixture of Cyphos IL 101 and Cyphos IL 167 with Cyanex 272 have been tested as liquid carrier for boron separation by using a flat sheet supported liquid membrane. The results obtained allow us to think about the application of this kind of ILs on the process intensification to remove boron from chloride solutions. 2012-09-18T06:45:11Z http://hdl.handle.net/2117/16506 Title: Review of the dielectric properties of nanofiltration membranes and verification of the single oriented layer approximation Authors: Oatley, Darren Lee; Llenas Argelaguet, Laia; Pérez Magrané, Ramon; Williams, Paul M.; Martínez Lladó, Xavier; Rovira Boixaderas, Miquel Abstract: The structuring of water at soft solid surfaces remains an area of great interest to colloid science as a whole and has many applications in relation to colloid stability, foams, and wetting films as well as being central to membrane separations. Quantitatively calculating the structural components of thin layers of water and the interaction forces of hydrated molecules with the surface of pores through a layer of water having modified structure is one of the most important challenges in the physics of surface phenomenon. In this paper these effects are reviewed and discussed in relation to the confines of a capillary pore. Membrane nanofiltration is extremely complex and is dependent on the micro-hydrodynamics and interfacial events occurring at the membrane surface and within the membrane nanopores. There is significant debate as to the exact nature of these complex phenomena and rejection is typically attributed to a combination of steric and electrical effects. The electrical effects are less well understood and in particular the contribution of dielectric exclusion. A review of the two competing descriptions of dielectric exclusion is presented along with the theories currently used in modelling this phenomena. A series of rejection experiments of 0.01 M salt solutions at the membrane isoelectric point has been performed for the NF270 and NF99HF membranes. The dielectric constants inside the nanopore are calculated and these values were consistent for three of the salts studied, indicating that a simplistic model based on Born theory is accurate enough for engineering calculations and that ion solvation is most likely to be the more appropriate dielectric exclusion mechanism for true nanofiltration membranes. 2012-09-17T10:50:03Z http://hdl.handle.net/2117/16488 Title: Uranium speciation in river sediments contaminated by phosphate ores Authors: Meca, S.; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Martí Gregorio, Vicenç; Pablo Ribas, Joan de Abstract: Large amounts of phosphate ores with high concentrations of uranium were dumped by a phosphate plant into the Flix water reservoir in the Ebre River, Catalonia, NE Spain. These phosphate wastes have been mixed over the years with effluents from other industries as well as with the sediments of the river, resulting in a complex mixture of solid wastes and sediments. No investigations on uranium speciation in such sediments were made because of the complexity of the sediments composition as well as the relatively low uranium content. However, these studies are necessary in order to predict the release of the uranium to the river waters. Here, we studied uranium speciation in sediments from two sampling points of the Flix water reservoir and at depths from 5 to 113 cm. We used room temperature time-resolved laser fluorescence spectroscopy and a three-step sequential extraction procedure described by the Standards, Measurements, and Testing Programme of the European Union. We found that uranium was mainly present in the sediment samples as meta-autunite [Ca(UO2)2(PO4)2 10–12H2O], whose low solubility will result in a low release of uranium to the river waters. In addition, we found that some uranium was linked to sediments by forming surface complexes. We therefore made the first study of uranium speciation in the sediments of the Flix water reservoir. 2012-09-14T09:44:07Z