17 resultados para Sagard, Gabriel.

em Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco


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1 nota y 3 cartas (manuscritas) ; entre 155x047mm y 210x295mm. Caja 1 - Carpeta 47

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Fecha: 16 de noviembre de 1936 / Unidad de ínstalación: Carpeta Rectorado - C-1 / Nº de pág.: 1. Copia del original mecanografiado, con membrete y sello del Euzko Gudarostea y firma de Ramón de Azkue

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Fecha: >1970 reproducción / Unidad de instalación: Carpeta 45 - Expediente 1-4 / Nº de pág.: 3 (mecanografiadas)

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We report the findings of an experiment designed to study how people learn and make decisions in network games. Network games offer new opportunities to identify learning rules, since on networks (compared to e.g. random matching) more rules differ in terms of their information requirements. Our experimental design enables us to observe both which actions participants choose and which information they consult before making their choices. We use this information to estimate learning types using maximum likelihood methods. There is substantial heterogeneity in learning types. However, the vast majority of our participants' decisions are best characterized by reinforcement learning or (myopic) best-response learning. The distribution of learning types seems fairly stable across contexts. Neither network topology nor the position of a player in the network seem to substantially affect the estimated distribution of learning types.

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316 p. (Bibliogr. 301-316)

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In this work we attempt to find out the extent to which realistic prebiotic compartments, such as fatty acid vesicles, would constrain the chemical network dynamics that could have sustained a minimal form of metabolism. We combine experimental and simulation results to establish the conditions under which a reaction network with a catalytically closed organization (more specifically, an (M, R)-system) would overcome the potential problem of self-suffocation that arises from the limited accessibility of nutrients to its internal reaction domain. The relationship between the permeability of the membrane, the lifetime of the key catalysts and their efficiency (reaction rate enhancement) turns out to be critical. In particular, we show how permeability values constrain the characteristic time scale of the bounded protometabolic processes. From this concrete and illustrative example we finally extend the discussion to a wider evolutionary context.

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In this paper, reanalysis fields from the ECMWF have been statistically downscaled to predict from large-scale atmospheric fields, surface moisture flux and daily precipitation at two observatories (Zaragoza and Tortosa, Ebro Valley, Spain) during the 1961-2001 period. Three types of downscaling models have been built: (i) analogues, (ii) analogues followed by random forests and (iii) analogues followed by multiple linear regression. The inputs consist of data (predictor fields) taken from the ERA-40 reanalysis. The predicted fields are precipitation and surface moisture flux as measured at the two observatories. With the aim to reduce the dimensionality of the problem, the ERA-40 fields have been decomposed using empirical orthogonal functions. Available daily data has been divided into two parts: a training period used to find a group of about 300 analogues to build the downscaling model (1961-1996) and a test period (19972001), where models' performance has been assessed using independent data. In the case of surface moisture flux, the models based on analogues followed by random forests do not clearly outperform those built on analogues plus multiple linear regression, while simple averages calculated from the nearest analogues found in the training period, yielded only slightly worse results. In the case of precipitation, the three types of model performed equally. These results suggest that most of the models' downscaling capabilities can be attributed to the analogues-calculation stage.

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Helburuak: Ikasmaterial hau Euskal Herriko Unibertsitateko (UPV/EHU) Bilboko Ingeniaritza Goi Eskola Teknikoan (IGET) Makina Hidraulikoak irakasgaian 2004-2005 ikasturtetik 2010-2011 ikasturtera bitartean proposatu diren azterketetako enuntziatuen bilduma bat da. Ariketa horietan, makina hidrauliko guztien artean, bereziki turbomakinak landu dira helburu hauekin: Industria mailan fluidoekin lan egiten duten instalazioen eta makinen kalkuluetan trebetasuna hartzea. Ponpaketa-instalazioetan ponpen aukeraketa egitea, funtzionamendu-puntuak zehaztea, lan-baldintza egokiak zeintzuk diren ulertzea eta ager daitezkeen arazoak aurreikustea. Elektrizitatea lortzeko erabiltzen diren turbina hidraulikoen kalkuluak lantzea: aukeraketa, dimentsionaketa, funtzionamendua, antzekotasuna eta abar. Norentzat: Ikasmaterial hau Ingeniaritza Industrialeko 5. mailako Fluidoen Instalazioak eta Makinak izeneko irakasgaian erabiltzeko aproposa da. Horrez gain, Ingeniaritza Industrialeko Hidraulikari dagokion espezialitatean bereziki eta baita beste alor batzuetan ere erabilgarria izan daiteke: Fluidoen Mekanika, Instalazio Hidraulikoak... Orokorrean, Makina Hidraulikoekin zerikusia duten gaiak lantzen dituen edozein ikaslerentzat prestatutako lana da.

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Utilización de técnicas de visión artificial para extraer la firma del contorno de perfiles de caucho y proceder a su clasificación y comparación con su correspondiente plano.

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Cap. 1. La interrelación entre los sistemas turístico y patrimonial: más allá de los discursos apologéticos y las prácticas reduccionistas. Iñaki Arrieta Urtizberea Cap. 2. Turistas y museos. Apocalípticos e integrados. José Antonio Donaire. Cap. 3. Turismo cultural. Ficciones sobre realidades, realidades sobre invenciones. Agustín Santana Talavera, Pablo Díaz Rodríguez y Alberto Jonay Rodríguez Darias. Cap. 4. ¿Museos a la deriva o continentes a la deriva?: consecuencias de la crisis financiera para los museos de América del Norte, Yves Bergeron. Cap. 5. Patrimonio histórico, turismo, economía: ¿un desafío o una alianza? El caso de Populonia (Toscana, Italia). Daniele Manacorda. Cap. 6. Diagnóstico posrevolucionario en Túnez: delirio turístico, fiebre museística y la locura del jazmín. Habib Saidi. Cap. 7. Patrimonio etnológico: ¿recurso socioeconómico o instrumento sociopolítico? El caso de los Astilleros Nereo de Málaga. Esther Fernández de Paz. Cap. 8. De Rampas y Pasarelas: los museos Guggenheim como espacios artísticos genéricos. Sophia Carmen Vackimes. Cap. 9. El patrimonio como fuente de desarrollo sostenible en las regiones del interior norte de Portugal: el caso del municipio de Vieira do Minho. Eduardo Jorge Duque. Cap. 10. Museos, turismo y desarrollo local: el caso de Belmonte, Portugal. Luís Silva. Cap. 11. ¿Existen razones de eficiencia económica en las decisiones de cierre parcial de algunos museos locales? Análisis del caso del Museo Darder (Banyoles) en el contexto de los museos de Cataluña. Gabriel Alcalde, Josep Burch, Modest Fluvià, Ricard Rigall i Torrent y Albert Saló.

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Indargetze handiko materialek energia barreiatzeko duten gaitasunean parte hartzen duten prozesuak aztertu dira. (Euskera)

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Several pseudo-binary RxR2-x'Fe-17 alloys (with R = Y, Ce, Pr, Gd and Dy) were synthesized with rhombohedral Th2Zn17-type crystal structure determined from x-ray and neutron powder diffraction. The choice of compositions was done with the aim of tuning the Curie temperature (T-C) in the 270 +/- 20 K temperature range, in order to obtain the maximum magneto-caloric effect around room temperature. The investigated compounds exhibit broad isothermal magnetic entropy changes, Delta S-M(T), with moderate values of the refrigerant capacity, even though the values of Delta S-M(Peak) are relatively low compared with those of the R2Fe17 compounds with R = Pr or Nd. The reduction on the Delta S-M(Peak) is explained in terms of the diminution in the saturation magnetization value. Furthermore, the Delta S-M(T) curves exhibit a similar caret-like behavior, suggesting that the magneto-caloric effect is mainly governed by the Fe-sublattice. A single master curve for Delta S-M/Delta S-M(Peak)(T) under different values of the magnetic field change are obtained for each compound by rescaling of the temperature axis.