93 research outputs found
El pensamiento de santo Tomás de Aquino en la Encíclica Fides et ratio
No full textThe author presents the portrait of St. Thomas Aquinas following a selection of texts of the Encyclical. The harmony between faith and reason, the right autonomy of the human nature, the metaphysics of act of being (including the personal being) seem to be the ground of the recomendations of the Popes, particularly from Leo XIII to John Paul II, to study the thought of Aquinas, that was very present in the Council Vatican II
A probabilistic author-centered model for Twitter discussions
No full textIn a recent work some of the authors have developed an argumentative approach for discovering relevant opinions in Twitter discussions with probabilistic valued relationships. Given a Twitter discussion, the system builds an argument graph where each node denotes a tweet and each edge denotes a criticism relationship between a pair of tweets of the discussion. Relationships between tweets are associated with a probability value, indicating the uncertainty that the relationships hold. In this work we introduce and investigate a natural extension of the representation model, referred as probabilistic author-centered model, in which tweets within a discussion are grouped by authors, in such a way that tweets of a same author describe his/her opinion in the discussion and are rep- resented with a single node in the graph, and criticism relationships denote controversies between opinions of Twitter users in the discussion. In this new model, the interactions between authors can give rise to circular criticism relationships, and the probability of one opinion criticizing another has to be evaluated from the probabilities of criticism among the tweets that compose both opinions.This work was partially funded by the Spanish MICINN Projects TIN2015-71799-C2-1-P and TIN2015-71799-C2-2-PPeer Reviewe
Parametrization of embedded-atom method potential for liquid lithium and lead-lithium eutectic alloy
No full textLiquid lead-lithium eutectic remains as a promising candidate for various breeding-blanket designs in future nuclear-fusion technologies. The lack of a generalized theory of interatomic forces in the liquid state is reflected on the wide variety of proposed functional forms to describe interatomic interactions even in simple liquids. Computer simulations facilitate the study of liquid metal properties, due to mathematical and experimental challenges. A classical-MD EAM potential is parametrized using mechanical and non-mechanical (melting-point) properties to minimize the arbitrariness of functional forms, where the employed pair potential stems from the liquid-state theory to avoid the issue of the uniqueness of the potential. Enhanced performance is obtained for liquid density, energy, structure, diffusivity and shear viscosity of Li, and their temperature-dependencies. In a similar manner, reference experimental and ab initio MD data are used to parametrize a functional to describe Pb-Li pairwise interactions in liquid Pb-Li alloy, which is used with the derived EAM of liquid Li and a reference EAM of liquid Pb to investigate properties of liquid Pb-Li alloy. Enhanced transferability characteristics are obtained for low-in-lithium liquid Pb-Li melts, where Coulombic interactions are negligible. In specific, the exhibited behaviour of Li in liquid lead-lithium eutectic is consistent with findings from ab initio MD methods, and drastically different from predictions of previous C-MD studies which suggested a substantial segregation of Li atoms instead of dispersion. It is concluded that the functional form of the pair potential and its uniqueness influence both the pure liquid-metal properties and the validity of the potential transferability in multi-component systems, where a theoretical functional results in enhanced performance in pure and alloyed liquid systems.We thank Dr. Jordi Marti for the discussion about the NPA potential. The first author is a holder of FI AGAUR doctoral fellowship, provided by Generalitat de Catalunya and European Social Plus Fund. This work is partially funded by the EUROfusion project (Grant Agreement No. 101052200) under the Horizon Europe programme.With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000917-S).Peer reviewe
Metafisica del sorriso
No full textAnalisi del "sorriso" nella prospettiva dell'antropologia filosofica e della sociologia della cultura di H. Plessner. Con un confronto con R. Guardini
Provenance-based trust for grid computing: Position Paper
No full textCurrent evolutions of Internet technology such as Web Services, ebXML, peer-to-peer and Grid computing all point to the development of large-scale open networks of diverse computing systems interacting with one another to perform tasks. Grid systems (and Web Services) are exemplary in this respect and are perhaps some of the first large-scale open computing systems to see widespread use - making them an important testing ground for problems in trust management which are likely to arise. From this perspective, today's grid architectures suffer from limitations, such as lack of a mechanism to trace results and lack of infrastructure to build up trust networks. These are important concerns in open grids, in which "community resources" are owned and managed by multiple stakeholders, and are dynamically organised in virtual organisations. Provenance enables users to trace how a particular result has been arrived at by identifying the individual services and the aggregation of services that produced such a particular output. Against this background, we present a research agenda to design, conceive and implement an industrial-strength open provenance architecture for grid systems. We motivate its use with three complex grid applications, namely aerospace engineering, organ transplant management and bioinformatics. Industrial-strength provenance support includes a scalable and secure architecture, an open proposal for standardising the protocols and data structures, a set of tools for configuring and using the provenance architecture, an open source reference implementation, and a deployment and validation in industrial context. The provision of such facilities will enrich grid capabilities by including new functionalities required for solving complex problems such as provenance data to provide complete audit trails of process execution and third-party analysis and auditing. As a result, we anticipate that a larger uptake of grid technology is likely to occur, since unprecedented possibilities will be offered to users and will give them a competitive edge
Comparative Endocrine Stress Responses in Vertebrates
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
Solution Processed Bathocuproine for Organic Solar Cells
No full textPublisher Copyright: © 2017 IEEE.PTB7/PC71BM bulk heterojunction solar cell devices where the conventional calcium hole-blocking layer has been replaced by a solution processed bathocuproine (BCP) layer is described. The BCP thin film was deposited via spin coating from a dilute solution of BCP in a mixture of toluene and methanol directly on the top of the active layer. The silver cathode was subsequently deposited via thermal evaporation. The study shows that solar cells devices comprising solution-processed BCP show similar performance than devices made from either calcium or evaporated BCP. Moreover, the devices made from solution-processed BCP show superior stability in air than calcium and evaporated BCP-based devices. This is to the best of our knowledge, the first report of the use of solution processed BCP in organic solar cells.Manuscript received July 26, 2017; revised October 20, 2017; accepted November 28, 2017. Date of publication December 4, 2017; date of current version January 8, 2018. This work was supported by the Spanish Ministry of Economy and Competitiveness under Grant TEC2015-71915-REDT and Grant TEC2015-71324-R (MINECO/FEDER), in part by the Departa-ment d’Innovació, Universitats i Empresa, Generalitat de Catalunya (AGAUR) 2017SGR1527, and in part by the ICREA under the 2014 ICREA Academia Award. The review of this paper was arranged by Associate Editor C. Anghel. (Corresponding author: Lluis F. Marsal.) C. Stenta, M. P. Montero-Rama, A. Viterisi, and L. F. Marsal are with the De-partament d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Tarragona 43007, Spain (e-mail: [email protected]; [email protected]; [email protected]; [email protected]).Peer reviewe
Adquisició d'informació lexica i morfosintactica a partir de corpus sense anotar: aplicació al rus i al croat
No full textThesis in Linguistics written by Antoni Oliver González under the supervision of Dr. Irene Castellón Masalles (U. de Barcelona) and Dr. Lluis Márquez Villodre (U. Politécnica de Catalunya). The author was examined in July 27th, 2004 by the commitee formed by Dr. Horacio Rodríguez Hontoria (U. Politécnica de Catalunya), Joan Caltellví Vives (U. de Barcelona), Dr. Iñaki Alegria Loinaz (U. País Vasco), Dr. Toni Badia Cardús (U. Pompeu Fabra) and Dr. Ana Maria Fernández Montraveta (U. Autònoma de Barcelona). The grade obteined was Sobresaliente Cum LaudeTesis doctoral Lingüística realizada por Antoni Oliver González bajo la dirección do la doctora Irene Castellón Masalles (U. de Barcelona) y del doctor Lluis Márquez Villodre (U. Politécnica de Catalunya). El arto de defensa de la tesis tuvo lugar el 27 de julio de 2004 ante el tribunal formado por los doctores Horacio Rodríguez Hontoria (U. Politécnica de Catalunya), Joan Castellví Vives (U. de Barcelona), Iñaki Alegría Lomas (U. País Vasco), Toni Badia Cardús (U. Pompeu Fabra) y Ana Maria Fernández Montraveta (U. Autónoma de Barcelona). La calificación obtenida fue Sobresaliente Cum Laude por unanimidad
Of Mice and Men: Reflexiones sobre la ética de la experimentación animal
No full textEn el presente artículo se sostiene que la experimentación con animales es necesaria para generar una parte de los avances en los conocimientos médicos, pero sin ignorar el difícil e ineludible dilema moral que supone el imponer sufrimiento a unos seres a cambio de beneficios para otros que son, en esencia, muy similares a los primeros, tanto física como mentalmente. La similitud, cada vez más constatada por la ciencia, es rechazada por muchas personas para no tener mala conciencia por los numerosos usos y abusos que se hacen de los animales en la sociedad. Este rechazo encuentra reflejo en el ámbito legal y en el religioso, en los que se ha consolidado la equiparación de los animales a las cosas. Pero tal equiparación se revela cada vez menos plausible, y el trato hacia ellos dispensado cada vez menos justificable, con las crecientes evidencias sobre los sentimientos y la capacidad de raciocinio de los animales. La experimentación médica con animales es un caso especial, no obstante, por los importantes beneficios que reporta, que son reconocidos incluso por muchas personas preocupadas por la protección de los animales. Sin embargo, no pocos ciudadanos se manifiestan contrarios a estas prácticas al tiempo que desean beneficiarse de los avances médicos. Esta incoherente actitud puede deberse, por un lado, a que la sociedad no comprende la ciencia, y por otro al impacto de algunas campañas sensacionalistas en contra de la experimentación. Frente a todo esto, el autor plantea una serie de recomendaciones para el desarrollo de la actividad investigadora con animales basadas en la transparencia, la información, el reconocimiento del dilema ético y la participación en el debate que suscita, siempre con el objetivo de causar el menor sufrimiento posible.This essay argues that research on animals is necessary for the unhindered advancement of medical knowledge, but at the same time it recognises the moral dilemma of inflicting suffering on some beings for the benefit of others who are, in essence, very similar to them physically and mentally. The likeness, for which there is increasing scientific evidence, is rejected by many in order not to have bad conscience over the extensive use and abuse of animals in society. Such deeply rooted denial has been woven into most legal and religious traditions, which regard animals as things. This conception of animals is becoming increasingly implausible, and our poor treatment of them decreasingly justifiable, in the light of the amounting evidence regarding the existence and nature of their feelings and rationality. Medical research is a special case, however, because of the important benefits it provides, which many animal advocates are ready to admit. Nevertheless, a portion of society is against medical research on animals while still wanting to benefit from the medical advances. Such inconsistent attitudes may be due, on one hand, to the fact that people generally do not understand science, and on the other, to the impact of campaigns that selectively use very graphic examples of experiments. In this context the author proposes a set of recommendations for carrying out medical research on animals emphasising transparency, openness, recognition of the moral dilemma and participation in the debate it gives rise to, always keeping sight on the goal of minimising suffering
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