Novetats

Emergencia en la educación de posgrado. El caso de la experiencia educativa “Taller de Innovación Arquitectónica” de la maestría en Arquitectura de la Universidad Veracruzana, México

UPCommons - dj., 03/07/2019 - 18:14
Emergencia en la educación de posgrado. El caso de la experiencia educativa “Taller de Innovación Arquitectónica” de la maestría en Arquitectura de la Universidad Veracruzana, México Vázquez Honorato, Luis Arturo; Castro Salgado, Selim Abdel; Salazar Martínez, Bertha Lilia El paradigma de la complejidad y de sistemas nos obliga a replantear nuestra posición respecto a la forma en la que planteamos el proceso de Aprendizaje en los estudios de Arquitectura y Urbanismo, y con mayor importancia en los estudios de posgrado. El ensayo sobre procesos autoorganizados emergentes incluyen las formas de organización del equipo de trabajo, las temáticas de estudio emergentes o las formas de representación, que van más allá de los estándares de textos académicos formalizados, para formar parte de un aprendizaje y formación centrada en procesos complejos, que permiten a todos los involucrados entender cómo el estudio de la realidad no puede ser sintetizado –separado en partes abstractas, desconectadas–, sino únicamente estudiados de manera holística, conectada, contextual, auto-estructurada y emergente. Por otro lado, el estudio de los procesos plantea el reto de su definición –si lo entendemos como límite– que permita darle forma y, por lo tanto, márgenes. Este documento plantea el estudio de un caso de trabajo de investigación, –que si bien se ha desarrollado desde 2014, 2015 y 2017, se hace énfasis en el último resultado, por significar el avance más notorio del trabajo desarrollado en esta Experiencia Educativa–, desde su evolución hasta sus posibilidades futuras, como parte de una universidad pública mexicana, que en este momento lucha por una autodefinición de sus estrategias de aprendizaje y enseñanza, creemos que este planteamiento se exploran nuevas posibilidades del planteamiento de la investigación. Siendo varias las posibilidades que se visualizan: desde estudios que involucran a varias disciplinas relacionadas, el impacto que puede llegar a tener en distintos grados de estudio, el desarrollo de formas de representación específicas y algunas otras. El planteamiento fue desarrollado en la Experiencia Educativa Taller de Innovación Arquitectónica en la Facultad de Arquitectura Xalapa de la Universidad Veracruzana, conjuntando las investigaciones de cada uno de los estudiantes, en un solo ejercicio que les permitiera encontrar el sentido de su investigación desde el ámbito de la realidad sobre un contexto mucho más amplio, que al ser contrastado les permitiera realizar una crítica a sus propias posturas, así como la pertinencia de su trabajo de investigación. Ponència presentada a la sessió 2
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Redacció del projecte i direcció de les obres de rehabilitació de la nau 8 de Can Batlló, per adequar-la com a “Arxiu de la ciutat de Barcelona”, districte de Sants- Montjuïc

UPCommons - dj., 03/07/2019 - 18:01
Redacció del projecte i direcció de les obres de rehabilitació de la nau 8 de Can Batlló, per adequar-la com a “Arxiu de la ciutat de Barcelona”, districte de Sants- Montjuïc Partida Muñoz, Mara Gabriela; Mendoza Ramírez, Héctor
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The cohesive urban social fabric between local architectural identity and climatic response

UPCommons - dj., 03/07/2019 - 17:26
The cohesive urban social fabric between local architectural identity and climatic response Kaihoul, Ahmed; Sriti, Leila Ponència presentada a la sessió 7
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Heuristic methods in geographical routing protocols for VANETs

UPCommons - dc., 03/06/2019 - 20:27
Heuristic methods in geographical routing protocols for VANETs Urquiza Aguiar, Luis; Almeida, Daniel; Tripp Barba, Carolina; Aguilar Igartua, Mónica This paper proposes different local\hyph search heuristics to improve the performance of geographical routing protocols in VANET networks, which typically relies the selection of the next node only on the best candidate. The presented algorithms are based on modifications of well-known metaheuristics such as simulated annealing, metropolis and tabu. We divided our heuristics according to their operation in forwarding and recovery algorithms. However, a simultaneous use of some of them is also possible to improve the overall performance of the system. Simulation results of the proposed implementation of tabu-search in our routing proposal show a promising increment in the packet delivery ratio.
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A temporal phase coherence estimation algorithm

UPCommons - dc., 03/06/2019 - 20:15
A temporal phase coherence estimation algorithm Zhao, Feng; Mallorquí Franquet, Jordi Joan Pixel selection is a critical procedure in DInSAR processing. In this paper a new temporal phase coherence (TPC) estimation algorithm is proposed for the pixel selection. TPC is calculated based on the estimated interferometric phase noise of all included interferograms. The method has been tested and it turns out to be effective. Comparing with the classical amplitude dispersion (DA) method, TPC method can select more high quality pixels. © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Structural health monitoring with 94 GHz radar

UPCommons - dc., 03/06/2019 - 20:09
Structural health monitoring with 94 GHz radar Broquetas Ibars, Antoni; Aguasca Solé, Alberto; Martinez Cervera, Arturo; Tomás Jover, Roberto Technological developments in low-power mmW radar allow the measurement of deformations in the order of few micrometers and monitoring dynamic processes like structural vibration. This paper presents a fast acquisition FMCW radar operating at 94 GHz and recent experimental results of remote observation of micrometric vibration motion for bridge structural health monitoring. The presented approach offers cost reduction and applicability advantages compared to conventional techniques.
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Analysis of differential correction techniques for orbit determination interferometry

UPCommons - dc., 03/06/2019 - 20:01
Analysis of differential correction techniques for orbit determination interferometry Fernández Usón, Marc; Martin Fuster, Roger; Broquetas Ibars, Antoni Orbit determination errors are expected to be a major threat for obtaining focused images on Geostationary Synthetic Aperture Radar (GeoSAR) missions. A ground-based interferometer system is presently being under research to determine the satellite orbit with the required precision. However, from that system, it must be addressed which orbit determination techniques offer better results for that purpose. This paper provides a comparison between two differential correction techniques: the least squares (LS) and the extended Kalman filter (EKF) techniques.
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Phase ambiguity resolution for orbit determination interferometry

UPCommons - dc., 03/06/2019 - 19:56
Phase ambiguity resolution for orbit determination interferometry Fernández Usón, Marc; Martin Fuster, Roger; Broquetas Ibars, Antoni This paper proposes a method to solve the absolute phase ambiguity introduced by an orbit determination interferometer system, suitable for GeoSAR missions. This method will be complemented with simulated results in order to validate its reliability.
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International Conference Arquitectonics Network: Mind, Land and Society, Barcelona, 29-31 May, 1 June 2018: Abstract book

UPCommons - dc., 03/06/2019 - 18:56
International Conference Arquitectonics Network: Mind, Land and Society, Barcelona, 29-31 May, 1 June 2018: Abstract book
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Towards limiting the impact of timing anomalies in complex real-time processors

UPCommons - dc., 03/06/2019 - 18:55
Towards limiting the impact of timing anomalies in complex real-time processors Benedicte Illescas, Pedro; Abella Ferrer, Jaume; Hernández Chulde, Carlos Efrén; Mezzetti, Enrico; Cazorla Almeida, Francisco Javier Timing verification of embedded critical real-time systems is hindered by complex designs. Timing anomalies, deeply analyzed in static timing analysis, require specific solutions to bound their impact. For the first time, we study the concept and impact of timing anomalies in measurement-based timing analysis, the most used in industry, showing that they require to be considered and handled differently. In addition, we analyze anomalies in the context of Measurement-Based Probabilistic Timing Analysis, which simplifies quantifying their impact.
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International Conference Arquitectonics Network: Mind, Land and Society, Barcelona, 29-31 May, 1 June 2018: Call for papers

UPCommons - dc., 03/06/2019 - 18:17
International Conference Arquitectonics Network: Mind, Land and Society, Barcelona, 29-31 May, 1 June 2018: Call for papers
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Allelochemicals and esters from leaves and inflorescences of Sambucus nigra L

UPCommons - dc., 03/06/2019 - 18:02
Allelochemicals and esters from leaves and inflorescences of Sambucus nigra L Basas Jaumandreu, Josep; Heras Cisa, F. Xavier de las Allelochemical compounds were detected in leaves and inflorescences of Sambucus nigra L. by means of GC-EIMS. The identified compounds were characterized by their mass spectra and relative retention times as their trimethylsilyl derivatives. The pheromone L-isoleucine methyl ester extracted from inflorescences can attract pollinator insects during the flowering period and together with uncommon n-alkyl and benzyl esters were firstly identified in S. nigra. On the other hand, mandelonitrile, which is used by the plant to avoid herbivore attack, was observed as the most abundant compound from the leaf extracts. In the present work are described 154 compounds from leaves and 196 from inflorescences including alkanes, alcohols, acids and terpenoids from elder aerial parts.
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Desarrollo de competencias éticas en el ámbito docente universitario

UPCommons - dc., 03/06/2019 - 17:47
Desarrollo de competencias éticas en el ámbito docente universitario Arderiu Calvo, Amadeo Este trabajo pretende mostrar, a la luz de la literatura existente, la necesidad de incorporar activamente la dimensión ética a los estudios universitarios. Así, entendiendo que un buen profesional solamente puede ser un profesional ético, el artículo preconiza la necesidad del desarrollo de competencias éticas en el seno de la Universidad, con un estímulo continuo de mejora desde el compromiso con la sociedad. En la práctica profesional, la interiorización de valores, tendrá una fuerza mayor que cualquier deontología o autorregulación corporativa, que no son más que documentos de mínimos. Se trata, pues, de completar la formación de buenos profesionales, cuyas futuras generaciones están en la Universidad. El desarrollo de competencias éticas, en los estudios universitarios, debe estar permanentemente presente a través de todos los programas formativos y asignaturas, con el objetivo común (educandos y educadores) de alcanzar la excelencia profesional. La dimensión ética no puede ser un añadido, sino que es parte integral de la acción humana. Por ello, las competencias éticas deben ser desarrolladas en comunión con las demás, de forma absolutamente integrada, como parte indisoluble de toda materia curricular y a lo largo de todo el proceso formativo. En el texto se abordan posibles metodologías formativas. El papel de quienes como docentes integran la Universidad, no solamente será el de transmitir unos conocimientos y posibilitar un ámbito de práctica, sino también enseñar a través del ejemplo, siendo el papel del formador similar al que desempeña el liderazgo en un grupo de profesionales.
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Waveform flexibility in database-oriented cognitive wireless systems

UPCommons - dt., 03/05/2019 - 19:23
Waveform flexibility in database-oriented cognitive wireless systems Kulacz, Lukasz; Kryszkiewicz, Pawel; Kliks, Adrian; Pérez Romero, Jordi In this paper we discuss the idea of waveform flexibility in future wireless networks utilizing cognitive radio functionality. Mainly, we consider the possibility to adjust the shape of the waveform based on the information about the surrounding environment stored in a dedicated context-information database. In our approach, the cognitive terminal has an option to select one of four available waveforms to adapt itself in the best way to the constraints delivered by the database. In this paper we present the key concept of waveform flexibility, the proposed algorithm for waveform selection and the achieved simulation results. © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Evaluating the role of aggregate gradation on cracking performance of asphalt concrete for thin overlays

UPCommons - dt., 03/05/2019 - 18:55
Evaluating the role of aggregate gradation on cracking performance of asphalt concrete for thin overlays García Gil, Lívia; Miró Recasens, José Rodrigo; Pérez Jiménez, Félix Edmundo Thin asphalt concrete overlays are a maintenance technique that mainly restore the functional properties of pavements. One of the main issues in thin overlays is reflective cracking that can cause early deterioration and reduce their service life. For this reason, the purpose of this investigation is to evaluate the effect of material selection on cracking performance of asphalt concrete mixtures for thin overlays. In particular, this paper evaluates the role of aggregate skeleton gradation. The study of the effect of aggregate gradation was divided into two stages: (1) fine fraction content and (2) maximum nominal aggregate size. Based on this, up to seven asphalt mixture gradations were designed and evaluated through the Fénix test at different test temperatures. The results showed a significant correlation between the fine fraction content, and maximum nominal aggregate size, and the cracking performance of the asphalt concrete mixtures. Mixtures manufactured with a low content of fine aggregates, as well as small nominal maximum size, experienced a further improvement of their toughness. These results reflected the importance of considering not only the effect of asphalt binder and environmental conditions but also aggregate gradation in the design of asphalt concrete mixtures in order to achieve a desirable cracking performance.
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Co-digestion of microalgae and primary sludge: effect on biogas production and microcontaminants removal

UPCommons - dt., 03/05/2019 - 18:10
Co-digestion of microalgae and primary sludge: effect on biogas production and microcontaminants removal Solé Bundó, Maria; Garfi, Marianna; Matamoros Mercadal, Víctor; Ferrer Martí, Ivet Microalgal-based wastewater treatment plants are conceived as low cost and low energy consuming systems. The operation of these plants involves the management of primary sludge and microalgal biomass. The aim of this study is to analyse the anaerobic co-digestion of both by-products in terms of biogas production and contaminants of emerging concern removal. The co-digestion of microalgae and primary sludge (25/75% on a volatile solids basis) was investigated in continuous reactors and compared to microalgae mono-digestion at a hydraulic retention time of 20 days. Results showed how the co-digestion enhanced the anaerobic digestion of microalgal biomass, since primary sludge is a more readily biodegradable substrate, which increased the methane production by 65% and reduced the risk of ammonia toxicity. Regarding the contaminants, musk fragrances (galaxolide and tonalide) and triclosan showed the highest abundance on primary sludge (0.5–25 µg/g TS), whereas caffeine, methyl dihydrojasmonate and triphenyl phosphate were barely detected in both substrates (<0.1 µg/g TS). The removal of these contaminants was compound-depending and ranged from no removal to up to 90%. On the whole, microalgae mono-digestion resulted in a higher removal of selected contaminants than the co-digestion with primary sludge.
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Mechanical behavior of an unsaturated clayey silt: an experimental and constitutive modelling study

UPCommons - dt., 03/05/2019 - 17:43
Mechanical behavior of an unsaturated clayey silt: an experimental and constitutive modelling study Romero Morales, Enrique Edgar; Sánchez, Marcelo; Gai, Xuerui; Barrera Bucio, Mauricio; Lloret Morancho, Antonio This paper reports an experimental study and subsequent constitutive modelling focused on the stress-strain and volumetric response during deviatoric stress application of a partially saturated clayey-silt. The material was statically and isotropically compacted at constant water content towards a pre-defined pre-consolidation stress. A series of strain-controlled triaxial compression tests on a state-of-the-art device and isotropic experiments are presented and discussed. All of the experiments started at the same stress state (i.e., identical matric suction and mean net stress) and were conducted at the same constant suction. Several stress paths under isotropic conditions (i.e., drying/wetting, loading/unloading and wetting/drying) were followed to induce different over-consolidated states before shearing the specimens. The test results are initially interpreted using the elastoplastic Barcelona Basic Model (BBM). Independent tests were selected to determine the model parameters associated with the volumetric behavior of the soil. The BBM was not able to capture the dilatant behavior observed during shearing in all the samples. An enhancement of the BBM is proposed in this work, which consists in including a more general hardening law and sub-loading concepts. Main capabilities and limitations of original BBM and enhanced model are discussed and compared. The modified BBM was able to handle the dilatancy features observed in the experiments and provided a more realistic description of the experimental stress-strain behavior.
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A simple contaminant fate and transport modelling tool for management and risk assessment of groundwater pollution from contaminated sites

UPCommons - dt., 03/05/2019 - 17:09
A simple contaminant fate and transport modelling tool for management and risk assessment of groundwater pollution from contaminated sites Locatelli, Luca; Binning, Philip J.; Sánchez Vila, Francisco Javier; Søndergaard, Gitte Lemming; Rosenberg, Louise; Bjerg, Poul L. Contaminated sites pose a significant threat to groundwater resources. The resources that can be allocated by water regulators for site investigation and cleanup are limited compared to the large number of contaminated sites. Numerical transport models of individual sites require large amounts of data and are labor intensive to set up, and thus they are likely to be too expensive to be useful in the management of thousands of contaminated sites. Therefore, simple tools based on analytical solutions of contaminant transport models are widely used to assess (at an early stage) whether a site might pose a threat to groundwater. We present a tool consisting of five different models, representing common geological settings, contaminant pathways, and transport processes. The tool employs a simplified approach for preliminary, conservative, fast and inexpensive estimation of the contamination levels of aquifers. This is useful for risk assessment applications or to select and prioritize the sites, which should be targeted for further investigation. The tool is based on steady-state semi-analytical models simulating different contaminant transport scenarios from the source to downstream groundwater, and includes both unsaturated and saturated transport processes. The models combine existing analytical solutions from the literature for vertical (from the source to the top of the aquifer) and horizontal (within the aquifer) transport. The effect of net recharge causing a downward migration and an increase of vertical dispersion and dilution of the plume is also considered. Finally, we illustrate the application of the tool for a preliminary assessment of two contaminated sites in Denmark and compare the model results with field data. The comparison shows that a first preliminary assessment with conservative, and often non-site specific parameter selection, is qualitatively consistent with broad trends in observations and provides a conservative estimate of contamination.
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Current Trends in Simheuristics: from smart transportation to agent-based simheuristics

UPCommons - dt., 03/05/2019 - 16:56
Current Trends in Simheuristics: from smart transportation to agent-based simheuristics Estrada-Moreno, Alejandro; Juan Pérez, Ángel Alejandro; Panadero, Javier; Serrat Piè, Carles; Freixes, Alfons Simheuristics extend metaheuristics by adding a simulation layer that allows the optimization component to deal efficiently with scenarios under uncertainty. This presentation reviews both initial as well as recent applications of simheuristics, mainly in the area of logistics and transportation. We also discuss a novel agent-based simheuristic (ABSH) approach that combines simheuristic and multi-agent systems to efficiently solve stochastic combinatorial optimization problems. The presentation is based on papers [1], [2], and [3], which have been already accepted in the prestigious Winter Simulation Conference.
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Escala de gravedad de daños en edificios: de la asignación directa a la contrastación estadística

UPCommons - dt., 03/05/2019 - 16:45
Escala de gravedad de daños en edificios: de la asignación directa a la contrastación estadística Ruiz Gorrindo, Félix; Aguado de Cea, Antonio; Serrat Piè, Carles; Casas Rius, Joan Ramon Está firmemente demostrada la importancia de realizar mantenimiento preventivo en los edificios, para evitar que se degraden y aparezcan lesiones graves. También está demostrado que con el mantenimiento preventivo se ahorra dinero frente al mantenimiento correctivo. En el marco del mantenimiento cabe decir que para realizar las inspecciones periódicas de los edificios, es de gran utilidad el poder cuantificar hasta qué punto las deficiencias existentes son graves o no, con objeto de facilitar la toma de decisiones y priorizar las intervenciones terapéuticas. De hecho se han utilizado y utilizan numerosas escalas diferentes entre sí para valorar el grado de gravedad de los elementos constructivos. Pero no existe consenso común y estas escalas son diferentes entre sí según el estudio a que pertenezcan. Por ejemplo, en las diferentes normas ITE existentes en España se utilizan diferentes escalas y formas de valorar las deficiencias existentes y no hay consenso común en el método de valoración. En cambio, en otros ámbitos de la ciencia sí existen escalas de uso generalizado (escala Boufort (viento), escala Richter (terremotos), escala Mohs (dureza de una sustancia), escala EVA (grado del dolor), escala Douglas (estado del mar), etc.). Incluso en el ámbito de la eficiencia energética de edificios hay una escala de uso común en toda Europa. Todo lo referido muestra la necesidad de proponer y validar una escala que sirva para valorar el grado de gravedad de elementos constructivos en edificios, que sea de uso generalizado. El objetivo del presente artículo es proponer, en base a un largo y riguroso proceso metodológico, una escala que sirva para valorar el grado de gravedad de los daños en edificios, que pueda ser utilizada de manera generalizada.
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