Stability and asymptotic analysis of a fluid-particle interaction model

We are interested in coupled microscopic/macroscopic models describing the evolution of particles dispersed in a fluid. The system consists in a Vlasov-Fokker-Planck equation to describe the microscopic motion of the particles coupled to the Euler equations for a compressible fluid. We investigate dissipative quantities, equilibria and their stability properties and the role of external forces. We also study some asymptotic problems, their equilibria and stability and the derivation of macroscopic two-phase models.

Experimental investigation of transient natural convection cooling of high prandtl number fluid with variable viscosity

Report for the scientific sojourn at the James Cook University, Australia, between June to December 2007. Free convection in enclosed spaces is found widely in natural and industrial systems. It is a topic of primary interest because in many systems it provides the largest resistance to the heat transfer in comparison with other heat transfer modes. In such systems the convection is driven by a density gradient within the fluid, which, usually, is produced by a temperature difference between the fluid and surrounding walls. In the oil industry, the oil, which has High Prandtl, usually is stored and transported in large tanks at temperatures high enough to keep its viscosity and, thus the pumping requirements, to a reasonable level. A temperature difference between the fluid and the walls of the container may give rise to the unsteady buoyancy force and hence the unsteady natural convection. In the initial period of cooling the natural convection regime dominates over the conduction contribution. As the oil cools down it typically becomes more viscous and this increase of viscosity inhibits the convection. At this point the oil viscosity becomes very large and unloading of the tank becomes very difficult. For this reason it is of primary interest to be able to predict the cooling rate of the oil. The general objective of this work is to develop and validate a simulation tool able to predict the cooling rates of high Prandtl fluid considering the variable viscosity effects.

Recomanacions per defensar l’informe al judici oral

L'equip de la comunitat d'assessorament tècnic penal s'ha aplegat, en aquesta ocasió,per elaborar una guia de bones pràctiques en l’exercici de la tasca pericial en la situació de judici oral. És a dir, un manual que ajudi a identificar els elements que cal posar en joc per contestar la pregunta clau de tot peritatge: és creïble, el relat?, i que alhora doni pistes clares sobre com presentar el resultat d’aquesta feina.

The effects of teacher talk on students’ oral productions

The present study is a brief personal enquiry into the teaching and learning of EFL in the classroom with an orientation to action and personal professional development. It focuses on teacher talk, making special emphasis on questions, as well as on students’ resulting oral productions. The research contains samples of empirical data, which include their interpretations in the light of relevant research literature, and a more personal overall reflection of the teaching practice. Both the analysis and the reflections derive to a large extent from the self-observation paper 1 (SO1) and the Practicum portfolio (PP) developed within the TED Masters Degree practicum stages

Analyzing complexity in foreign language monologic oral production in a CLIL context

The study tested three analytic tools applied in SLA research (T-unit, AS-unit and Idea-unit) against FL learner monologic oral data. The objective was to analyse their effectiveness for the assessment of complexity of learners' academic production in English. The data were learners' individual productions gathered during the implementation of a CLIL teaching sequence on Natural Sciences in a Catalan state secondary school. The analysis showed that only AS-unit was easily applicable and highly effective in segmenting the data and taking complexity measures

Implementing CLIL in a primary school in Spain : the effects of CLIL on L2 English learners' oral production skills

This study presents the results of implementing a CLIL programme in a Catalan primary school three years after the onset of the implementation. The main objective of this investigation was to determine the effects of CLIL on students’ L2 English oral performance in terms of Complexity, Accuracy and Fluency (CAF). The results obtained suggest that CLIL learners outperform non-CLIL learners not only in fluency, but also in syntactic complexity. However, despite the encouraging results, the study concludes that further research which transcends the methodological limitations observed in the study is needed in order to confirm the results

An approximate solution method for boundary layer flow of a power law fluid over a flat plate

The work in this paper deals with the development of momentum and thermal boundary layers when a power law fluid flows over a flat plate. At the plate we impose either constant temperature, constant flux or a Newton cooling condition. The problem is analysed using similarity solutions, integral momentum and energy equations and an approximation technique which is a form of the Heat Balance Integral Method. The fluid properties are assumed to be independent of temperature, hence the momentum equation uncouples from the thermal problem. We first derive the similarity equations for the velocity and present exact solutions for the case where the power law index n = 2. The similarity solutions are used to validate the new approximation method. This new technique is then applied to the thermal boundary layer, where a similarity solution can only be obtained for the case n = 1.

Ciclofosfamida oral metronómica en combinación con prednisona tras la progresión a docetaxel en pacientes afectados de un cáncer de próstata metastásico resistente a la castración (CPRC).

Estudi retrospectiu que avalua eficàcia i tolerabilitat de ciclofosfamida oral metronòmica (COM) més prednisona en CPRC com a segona línia de tractament després de la progressió a docetaxel. Quinze pacients foren tractats. L'objectiu principal fou eficàcia del tractament. Els objectius secundaris eren toxicitat, període lliure de progressió (PLP) i supervivència global (SG). La resposta parcial per PSA es va evidenciar en 33.3%. La mitjana del PLP i SG van ser de 4.1 mesos i 7.2 mesos respectivament. La principal toxicitat va ser l'astènia. COM és poc tòxica i pot ser una alternativa en aquells malalts amb mal estat

Incidencia y gravedad de la enfermedad por citomegalovirus en pacientes trasplantados renales que han recibido tratamiento anticipado o profilaxis con valganciclovir oral

Antecedentes: La infección por CMV es la más frecuente que sufren los receptores de trasplante de órgano sólido (TOS) en los primeros meses del trasplante. Son abundantes las estrategias de prevención y tratamiento de la enfermedad por CMV que se han desarrollado. Métodos: El objetivo fue evaluar la incidencia y severidad de la enfermedad por CMV en 387 receptores de trasplante renal que recibieron tratamiento profiláctico (grupo de alto riesgo, n = 251) o realizaron seguimiento de PCR de CMV por ser grupo de bajo riesgo (n = 136) y recibieron tratamiento anticipado (n = 17) con valganciclovir oral (900 mg/día) cuando presentaron & 1000 copias/ml. Resultados: Presentaron enfermedad por CMV, 2 (11,76%) pacientes del grupo de riesgo estándar, descrita como enfermedad leve y 20 (7,96%) pacientes del grupo de alto riesgo, descrita como enfermedad leve en 15 casos y como enfermedad grave en 5 casos. Aquellos pacientes que desarrollaron la enfermedad, respondieron al tratamiento con ganciclovir endovenoso durante 14 días seguido de valganciclovir oral hasta completar tres meses. Conclusión: El tratamiento profiláctico con valganciclovir oral para la prevención de enfermedad o infección por CMV solamente es necesario en los receptores de TOS de alto riesgo.

La tradició oral africana lluny del seu context d'origen : estudi sobre la vigència i funcions de les històries orals senegaleses a l'àrea de Barcelona

La recerca vol determinar, principalment, si continua donant-se i sent vàlida la transmissió de la cultura oral de l'Àfrica occidental fora del seu context originari, en el cas concret del col·lectiu senegalès a l'àrea de Barcelona.

Dificultats d'aprenentatge en el llenguatge oral i escrit i en matemàtiques en un cas d'un nen amb trastorn per dèficit d'atenció sense hiperactivitat

Aquest projecte final de Pràcticum I de Psicologia de l'Educació explica totes les activitats que he dut a terme al llarg de la meva estada en practiques al centre Orienta. S'hi descriuen les característiques més rellevants del centre, així com els serveis que ofereix a la comunitat educativa, molt especialment els adreçats a ajudar els infants a millorar les seves capacitats d'aprenentatge, des d'un marc teòric cognitiu-conductual i sistèmic, tot emfatitzant el treball col·laboratiu que mantenen els professionals de l'educació amb les famílies dels nens. El projecte detalla les activitats de col·laboració en la intervenció que he realitzat des de l'àmbit educatiu de la Psicologia, la seva temporització i seguiment i finalment, les conclusions i prospectiva envers el treball realitzat, així com la valoració crítica que en faig de la meva estada en pràctiques.

Assessorament per a la millora de la llengua oral en un centre de primària

Aquest projecte pretén millorar les competències en llengua oral dels alumnes a partir de la reflexió amb els mestres sobre les pràctiques que es fan servir actualment per al seu aprenentatge. A partir d'aquesta reflexió, es proposen els canvis i modificacions pertinents que podrien millorar la competència dels alumnes en llengua oral.

Assessorament a un grup de treball per millora la competència oral en L2 en una escola bilingüe de Berlin

Aquest treball se centra en l'experiència teoricopràctica de l'Escola Europea Bilingüe Espanyol-Alemany Joan Miró Grundschule, en el plantejament de la millora de la competència oral en L2.

Meaning of the λ parameter of skew–normal and log–skew normal distributions in fluid geochemistry

The literature related to skew–normal distributions has grown rapidly in recent yearsbut at the moment few applications concern the description of natural phenomena withthis type of probability models, as well as the interpretation of their parameters. Theskew–normal distributions family represents an extension of the normal family to whicha parameter (λ) has been added to regulate the skewness. The development of this theoreticalfield has followed the general tendency in Statistics towards more flexible methodsto represent features of the data, as adequately as possible, and to reduce unrealisticassumptions as the normality that underlies most methods of univariate and multivariateanalysis. In this paper an investigation on the shape of the frequency distribution of thelogratio ln(Cl−/Na+) whose components are related to waters composition for 26 wells,has been performed. Samples have been collected around the active center of Vulcanoisland (Aeolian archipelago, southern Italy) from 1977 up to now at time intervals ofabout six months. Data of the logratio have been tentatively modeled by evaluating theperformance of the skew–normal model for each well. Values of the λ parameter havebeen compared by considering temperature and spatial position of the sampling points.Preliminary results indicate that changes in λ values can be related to the nature ofenvironmental processes affecting the data