Onset of Phase Synchronization in Neurons Conneted via Chemical Synapses

We study the onset of synchronous states in realistic chaotic neurons coupled by mutually inhibitory chemical synapses. For the realistic parameters, namely the synaptic strength and the intrinsic current, this synapse introduces non-coherences in the neuronal dynamics, yet allowing for chaotic phase synchronization in a large range of parameters. As we increase the synaptic strength, the neurons undergo to a periodic state, and no chaotic complete synchronization is found.Comment: to appear in Int. J. Bif. Chao

Structure and function in flow networks

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CLINT EASTWOOD ATOR E DIRETOR

This paper aims to reflect on the work of Clint Eastwood as a director and as an actor, using the concepts of classic and post-classical, according to definitions by David Bordwell, Kristin Thompson and Janet Staiger, and the theory of the Psychological Gesture of of the Russian Michael Checkhov. To think of Eastwood as director and actor, the concepts of post-classical and the Psychological Gesture, and of we will study opening sequences from the films Play Misty for Me (1971), his first work as a director and The Outlaw Josey Wales (1976). We base the criterion of analyzing the opening scenes as revealing and significant to analyze the style of a filmmaker, on Jacques Aumont and Michel Marie's seminal work Film Analysis (2010).  Este artículo pretende reflexionar sobre la obra de Clint Eastwood como director y como actor, utilizando los conceptos de clásico y postclásico, según las definiciones de David Bordwell, Kristin Thompson y Janet Staiger, y la teoría del Gesto Psicológico de la escuela de interpretación teatral del ruso Michael Checkhov. Para pensar en Eastwood como director y actor, los conceptos de postclásico y el Gesto Psicológico, y de estudiaremos secuencias de apertura de las películas Escalofrio en la noche (Play Misty for Me, 1971), su primer trabajo como director y El fugitivo Josey Wales (The Outlaw Josey Wales, 1976). Basamos el criterio del análisis de las escenas de apertura como reveladoras y significativas para analizar el estilo de un cineasta, en la obra seminal de Jacques Aumont y Michel Marie Análise de filme (2010)  O presente artigo tem como objetivo refletir sobre a obra de Clint Eastwood como diretor e como ator, utilizando os conceitos de clássico e pós-clássico, segundo definições de David Bordwel, Kristin Thompson e Janet Staiger, e a teoria do Gesto Psicológico da escola de interpretação teatral do russo Michael Checkhov. Para pensar o Eastwood como diretor e ator, os conceitos de pós-clássico e do Gesto Psicológico, e de estudaremos sequências de abertura dos filmes Play Misty for Me (1971), primeira obra dele como diretor e de O fora da ley Josey Wales (The Outlaw Josey Wales,1976). Fundamentamos o critério da análise das cenas de abertura como reveladoras e significativas para analisar o estilo de um cineasta, na obra seminal de Jacques Aumont e Michel Marie Análise de filme (2010)

Pictografia em movimento

Os pictogramas e o movimento estão presentes no nosso dia a dia mas são poucos os exemplos que relacionam estas duas temáticas. Neste contexto, o presente estudo, realizado no âmbito do design de informação, teve como objetivo analisar a pertinência da introdução de movimento a uma realidade que é vista como predominantemente analógica. Assim, tendo por base conceitos teóricos, estudos de caso e os resultados de uma investigação de campo que incluiu entrevistas, questionários e focus group, foram criadas e testadas propostas especulativas de introdução de movimento em treze pictogramas do sistema AIGA. Através dos exercícios efetuados concluiu-se que a introdução de movimento poderá ser um contributo importante para facilitar a interpretação de pictogramas e para permitir a sua evolução em novas vertentes, tais como incentivar ao comportamento cívico, reforçar o contexto da mensagem e criar elos emocionais.Pictograms and movement are part of our daily life but there are few examples relating these two themes. The current study, undertaken as a Masters degree project in Information Design, aims to analyse the relevance of introducing movement to a medium that is considered to be mainly analogical. Based on theoretical concepts, case studies and the results of a field work that included interviews, questionnaires and focus group, were created and tested hypothetical proposals to introduce movement to thirteen AIGA system pictograms. Through the exercises undertaken, it was concluded that the introduction of movement may be an important contribution to facilitate the interpretation of pictograms and to allow their evolution to new dimensions, such as fostering civic behaviour, strengthening message context and creating emotional ties

Twisting gauged non-linear sigma-models

We consider gauged sigma-models from a Riemann surface into a Kaehler and hamiltonian G-manifold X. The supersymmetric N=2 theory can always be twisted to produce a gauged A-model. This model localizes to the moduli space of solutions of the vortex equations and computes the Hamiltonian Gromov-Witten invariants. When the target is equivariantly Calabi-Yau, i.e. when its first G-equivariant Chern class vanishes, the supersymmetric theory can also be twisted into a gauged B-model. This model localizes to the Kaehler quotient X//G.Comment: 33 pages; v2: small additions, published versio

Methods for removal of unwanted signals from gravity time-series : comparison using linear techniques complemented with analysis of system dynamics

We thanks the participants of the 35th General Assembly of the European Seismological Commission for comments on preliminary results. The authors are grateful to all IGETS contributors, particularly to the station operators and to ISDC/GFZ-Potsdam for providing the original gravity data used in this study. We also thank the developers of ATLANTIDA3.1 and UTide. Part of this work was performed using the ICSMB High Performance Computing Cluster, University of Aberdeen. We also thanks M. Thiel and A. Moura for reviewing a preliminary version and making comments on the methods section and M.A. Ara´ujo for comments on Lyapunov exponents. Funding: A. Valencio is supported by CNPq, Brazil [206246/2014-5]; and received a travel grant from the School of Natural and Computing Sciences, University of Aberdeen [PO2073498], for a presentation including preliminary results.Peer reviewedPostprintPublisher PD

Second-order finite volume with hydrostatic reconstruction for tsunami simulation

Tsunami modeling commonly accepts the shallow water system as governing equations where the major difficulty is the correct treatment of the nonconservative term due to bathymetry variations. The finite volume method for solving the shallow water equations with such source terms has received great attention in the two last decades. The built-in conservation property, the capacity to correctly treat discontinuities, and the ability to handle complex bathymetry configurations preserving some steady state configurations (well-balanced scheme) make the method very efficient. Nevertheless, it is still a challenge to build an efficient numerical scheme, with very few numerical artifacts (e.g., small numerical diffusion, correct propagation of the discontinuities, accuracy, and robustness), to be used in an operational environment, and that is able to better capture the dynamics of the wet-dry interface and the physical phenomena that occur in the inundation area. In the first part of this paper, we present a new second-order finite volume code. The code is developed for the shallow water equations with a nonconservative term based on the hydrostatic reconstruction technology to achieve a well-balanced scheme and an adequate dry/wet interface treatment. A detailed presentation of the numerical method is given. In the second part of the paper, we highlight the advantages of the new numerical technique. We benchmark the numerical code against analytical, experimental, and field results to assess the robustness and the accuracy of the numerical code. Finally, we use the 28 February 1969 North East Atlantic tsunami to check the performance of the code with real data.Historical data for Cascais and Lagos (1969 Lisbon Tsunami) are available at http://www.dgterritorio.pt/cartografia_e_geodesia/geodesia/redes_geodesicas/rede_maregrafica/. The tagus estuary data (typewriter document) are available at the Dom Luiz Institute library http://idl.ul.pt/node/33. This work is funded by the Portugal-France research agreement, through the research project GEONUM FCT-ANR/MAT-NAN/0122/2012. This research was financed by Portuguese Funds through FCT-Fundacao para a Ciencia e a Tecnologia, within the Project UID/MAT/00013/2013

Maintaining extensivity in evolutionary multiplex networks

In this paper, we explore the role of network topology on maintaining the extensive property of entropy. We study analytically and numerically how the topology contributes to maintaining extensivity of entropy in multiplex networks, i.e. networks of subnetworks (layers), by means of the sum of the positive Lyapunov exponents, HKS, a quantity related to entropy. We show that extensivity relies not only on the interplay between the coupling strengths of the dynamics associated to the intra (short-range) and inter (long-range) interactions, but also on the sum of the intra-degrees of the nodes of the layers. For the analytically treated networks of size N, among several other results, we show that if the sum of the intra-degrees (and the sum of inter-degrees) scales as N?+1, ? > 0, extensivity can be maintained if the intra-coupling (and the inter-coupling) strength scales as N??, when evolution is driven by the maximisation of HKS. We then verify our analytical results by performing numerical simulations in multiplex networks formed by electrically and chemically coupled neurons

Resumen historico de la portentosa llegada de la imagen del Smo. Christo del Salvador a los muros de la ciudad de Valencia ... en el año 1250, sacado de los escritores de la historia de dicha ciudad ... que publicaron D. Juan Bautista Ballester ... en el año 1672 ... y D. Josef Vicente Ortí y Mayor en el año 1709

Sign.: [A]-B2, C8Grab. xil. con la imagen del Ss. Christo del Salvado