6,510 research outputs found

    Mixed-methods research: a new approach to evaluating the motivation and satisfaction of university students using advanced visual technologies

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    The final publication is available at link.springer.comA mixed-methods study evaluating the motivation and satisfaction of Architecture degree students using interactive visualization methods is presented in this paper. New technology implementations in the teaching field have been largely extended to all types of levels and educational frameworks. However, these innovations require approval validation and evaluation by the final users, the students. In this paper, the advantages and disadvantages of applying mixed evaluation technology are discussed in a case study of the use of interactive and collaborative tools for the visualization of 3D architectonical models. The main objective was to evaluate Architecture and Building Science students’ the motivation to use and satisfaction with this type of technology and to obtain adequate feedback that allows for the optimization of this type of experiment in future iterations.Postprint (author’s final draft

    Circular economy through plastic recycling process into 3D printed products: A frugal solution for schools

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    Frugal Innovation Plastic has a great number of benefits that have made itan essential material in our life,being one of the most used and produced materials around the world,over the past decades. In addition, its manufacturing is even going to increasein the next years. Consequentially, the fact of such a huge production is connected toanenormous waste generation. For this reason, it is important to takecare of the environment through a green concept, circularity and recycling besides alerting the population in order to become awareof this problemand to change bad habits. Circular Economy has emerged as one of the main conceptsthat can bringsolutions on this matterenabling the reduction of the environmental damage. Therefore, 3D printing has emerged as one of the most scalable technologies to implement the concept of circular economy. On the other hand, a successful solution must be affordable in order to encourage to develop these new practices. Within this context, it has emerged Frugal Innovation which intends to provide good results facing financial or operative restraints. The goal of this Master dissertationis based on circular economy concept through plastic recycling(PET bottles)into 3D printed productsin a scholar demonstration. Methodologies are employed with frugal concept as reference, trying to offer an inexpensive solution. Most of the difficulties come from extrusion and filament quality while some of the main results obtained are: avoid glue, take into account the appropriate parameters of the extruder or add a cooling syste

    The relation between the implementation of learning objects and the listening skills in students of BA in Spanish and English

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    Learning objects (LOs) are materials designed to be self-contained digital instructional units that can be combined to create a variety of learning experiences. However, very few Higher education institutions in Colombia are using LOs for teaching purposes. Universidad Popular del Cesar is one of those educational institutions where LOs had been implemented without knowing how meaningful or inadequate its use is. Hence, the aim of this study is to establish the relation between the implementation of LOs and the development of listening skills in a group of students at this university. This qualitative investigation is nourished by case study methodology where 18 BA in Spanish and English students had an active role in using LOs to enhance their listening skills. The results of this research reveal that since English lab teacher mediation was accurate to the target lesson, the chosen group of students derived benefit from using LOs. Nonetheless, learners also experienced some difficulties in implementing LOs such as the low quality of Internet connection among other technical trouble. It is worth stating that the results of this research will be integrated to the curriculum of the BA in Spanish and English program at Universidad Popular del Cesar in order to enhance the academic processes by improving the communicative competence as well as the coherence regarding the way these target subjects work.Maestr√≠aMagister en la Ense√Īanza del Ingle

    Large eddy simulation and laboratory experiments on the decay of grid wakes in strongly stratified flows

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    A detailed analysis of the flow structure resulting from the combination of turbulence and internal waves is carried out and visualized by means of the Schlieren method on waves in a strongly stratified fluid at the Laboratory of the IPM in Moscow. The joint appearance of the more regular internal wave oscillations and the small-scale turbulence that is confined vertically to the Ozmidov length scale favours the use of a simple geometrical analysis to investigate their time-space span and evolution. This provides useful information on the collapse of internal wave breaking processes in the ocean and the atmosphere. The measurements were performed under a variety of linear stratifications and different grid forcing scales, combining the grid wake and velocity shear. A numerical simulation using LES on the passage of a single bar in a linearly stratified fluid medium has been compared with the experiments identifying the different influences of the environmental agents on the actual effective vertical diffusion of the wakes. The equation of state, which connects the density and salinity, is assumed to be linear, with the coefficient of the salt contraction being included into the definition of salinity or heat. The characteristic internal waves as well as the entire beam width are related to the diameter of the bar, the Richardson number and the peak-to-peak value of oscillations. The ultimate frequency of the infinitesimal periodic internal waves is limited by the maximum buoyancy frequency relating the decrease in the vertical scale with the anisotropy of the velocity turbulent r.m.s. velocity.Peer ReviewedPreprin

    Building LABDRIVE, a Petabyte Scale, OAIS/ISO 16363 Conformant, Environmentally Sustainable Archive, Tested by Large Scientific Organisations to Preserve their Raw and Processed Data, Software and Documents

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    Vast amounts of scientific, cultural, social, business and government, and other, information is being created every day. There are billions of objects, in a multitude of formats, semantics and associated software. Much, perhaps the majority, of this information is transitory but there is still an immense amount which should be preserved for the medium and long term ‚Äď perhaps even indefinitely. Preservation requires that the information continues to be usable, not simply to be printed or displayed. Of course, the digital objects (the bits) must be preserved, as must the ‚Äúmetadata‚ÄĚ which enables the bits to the understood which includes the software. Before LABDRIVE no system could adequately preserve such information, especially in such gigantic volume and variety.  In this paper we describe the development of LABDRIVE and its ability to preserve tens or hundreds of petabytes in a way which is conformant to the OAIS Reference Model and capable of being ISO 16363 certified

    Mixing in convective thermal fluxes in unsteady nonhomogeneous flows generating complex three dimensional vorticity patterns

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    Diffusion and scaling of the velocity and vorticity in a thermoelectric driven heating and cooling experimental device is presented in order to map the different patterns and transitions between two and three dimensional convection in an enclosure with complex driven flows. The size of the water tank is of 0.2 x 0.2 x 0.1 m and the heat sources or sinks can be regulated both in power and sign [1-3]. The thermal convective driven flows are generated by means of Peltier effects in 4 wall extended positions of 0.05 x 0.05 cm each. The parameter range of convective cell array varies strongly with the Topology of the boundary conditions. Side heat and momentum fluxes are a function of Rayleigh, Peclet and Nusselt numbers, [4-6] Visualizations are performed by PIV, Particle tracking and shadowgraph. The structure of the flow is shown by setting up a convective flow generated by buoyant heat fluxes. The experiments described here investigate high Prandtl number mixing using brine and fresh water in order to form a density interface and low Prandtl number mixing with temperature gradients. The evolution of the mixing fronts are compared and the topological characteristics of the merging of the convective structures are examined for different configurations. Based on two dimensional Vorticity spectral analysis, new techniques can be very useful to determine the evolution of scales considering the multi-fractal structure of the convective flows.Peer ReviewedPostprint (published version

    Nou analitzador on-line de residus contaminants en biogas

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    Investigadors del Grup de Tractament de Residus Gasosos del Departament d'Enginyeria Qu√≠mica de la UAB han desenvolupat un analitzador per a la detecci√≥ d'i√≥ sulfur en l√≠quid i sulfur d'hidrogen en gas, especialment dissenyat per ser utilitzat en el control de biofiltres per al tractament de biogas amb alta c√†rrega de sulfur d'hidrogen.Investigadores del Grupo de tratamiento de res√≠duos gaseosos del Departamento de Ingenier√≠a Qu√≠mica de la UAB han desarrollado un analizador para la detecci√≥n de ion sulfuro en l√≠quido y sulfuro de hidr√≥geno en gas, especialmente dise√Īado para ser utilizado en el control de biofiltros para el tratamiento de biog√°s con alta carga de sulfuro de hidr√≥geno.Researchers of the Group of Waste Gas Treatment at the Department of Chemical Engineering of the UAB have developed an analyser for the detection of sulfide ion in liquid and hydrogen sulfide in gas samples, especially designed to be used in the control of biof√≠lters for the treatment of biogas with high loads of hydrogen sulfide

    Los museos etnológicos como instrumentos de formación ciudadana para la sostenibilidad

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    Los museos etnológicos y antropológicos persiguen fundamentalmente mostrar los variados aspectos de la vida de los grupos humanos y las relaciones que entre ellos se establecen; constituyen, pues, una ocasión idónea para poner de manifiesto la vinculación de los problemas locales que afectan a un grupo humano concreto con los globales a los que ha de hacer frente la humanidad en su conjunto. La investigación que presentamos ha estado orientada a analizar en qué medida estos museos están prestando atención a los problemas que amenazan la conservación de nuestro planeta y a las medidas a adoptar para que una determinada región contribuya a lograr un desarrollo sostenible

    Rehabilitación Energética del edificio H de la Escuela Técnica Superior de Ingeniería Industrial de Barcelona (ETSEIB)

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    El objetivo de esta tesis es proponer medidas de mejora para el Edificio H de la Escuela T√©cnica Superior de Ingenier√≠a Industrial de Barcelona, enfocadas principalmente en la eficiencia energ√©tica, el impacto ambiental y los potenciales ahorros econ√≥micos en el edificio, siendo complementadas por la b√ļsqueda de la mejora en la calidad del confort al interior de los espacios. Las propuestas se plantean a partir del an√°lisis del consumo actual de energ√≠a, el comportamiento t√©rmico de la envolvente del edificio y el funcionamiento de los sistemas e instalaciones para climatizaci√≥n (calefacci√≥n y refrigeraci√≥n) e iluminaci√≥n. As√≠, se plantea una propuesta de rehabilitaci√≥n energ√©tica mediante diferentes medidas de mejora como lo son la incorporaci√≥n de un sistema de aislamiento de la envolvente, la sustituci√≥n de la ventaner√≠a, el cambio de luminarias y la incorporaci√≥n de un nuevo sistema centralizado de calefacci√≥n y refrigeraci√≥n. El conjunto de estas mejoras logra un ahorro energ√©tico al reducir el consumo en un 48,4%, obtenido en gran parte por el ahorro de demanda energ√©tica generado bajo la medida de mejora de la envolvente con una reducci√≥n importante de demanda para calefacci√≥n y refrigeraci√≥n de 54,2%. El documento se complementa con conclusiones sobre el estado actual de la edificaci√≥n, sobre las medidas de mejora y sobre la aplicaci√≥n de este tipo de proyectos en Colombia. Estas propuestas promueven un edificio de consumo energ√©tico casi nulo, conocido como NZEB (Nearly Zero Energy Building), estando dentro del marco normativo del C√≥digo T√©cnico de la Edificaci√≥n y logrando enmarcarse en los objetivos del Plan UPC Energ√≠a 2020 al reducir la demanda energ√©tica y las emisiones de CO2 en las edificaciones pertenecientes a la universidad.The goal of this thesis is to propose improvement measures for the H Building of the Barcelona School of Industrial Engineering, focused mainly on energy efficiency, environmental impact and potential economic savings in the building, being complemented by the search for the improvement in quality of comfort inside the spaces. The improvement proposals are based on the analysis of current energy consumption, the thermal behavior of the building envelope and the operation of systems and installations for heating, cooling and lighting. Thus, a proposal for energy rehabilitation is proposed through different improvement measures such as the incorporation of an envelope insulation system, the replacement of glazing elements, the change of luminaires and the incorporation of a new centralized heating and cooling system. All these improvements would achieve energy savings by reducing consumption by 48.4%, largely obtained by the reduction of energy demand generated under the envelope improvement measure with a significant reduction in demand for heating and cooling of 54.2% The document is complemented by conclusions on the current state of the building, on improvement measures and on the application of this type of projects in Colombia. These proposals promote an almost zero energy consumption building, kown as NZEB (Nearly Zero Energy Building), being within the regulatory framework of the Technical Building Code and achieving the goals of the UPC Energy 2020 Plan by reducing energy demand and CO2 emissions in the buildings belonging to the university
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