Stretched exponential relaxation in the Coulomb glass

The relaxation of the specific heat and the entropy to their equilibrium values is investigated numerically for the three-dimensional Coulomb glass at very low temperatures. The long time relaxation follows a stretched exponential function, $f(t)=f_0\exp[-(t/\tau)^\beta]$, with the exponent $\beta$ increasing with the temperature. The relaxation time follows an Arrhenius behavior divergence when $T\to 0$. A relation between the specific heat and the entropy in the long time regime is found.Comment: 5 pages and 4 figure

Estudio de serie de casos de trombopenia inmune en la infancia

Conocer el impacto de la PTI en la infancia a través de un estudio descriptivo, estudiando su prevalencia, las características clínicas de presentación, la evolución, los abordajes terapéuticos y las asociaciones con enfermedades secundarias, en la Unidad de Oncología Infantil del Hospital Clínico de ValladolidGrado en Medicin

Percepción y rentabilidad cinegética : la hipótesis del “verdadero ecologista”

The hunting supposes in the set of the Spanish state an activity that together its economic importance plays an outstanding factor in the performance, modification and conservation of natural spaces. The hunter becomes an active agent who through a secular practice influences the fugitives and in the existing biodiversity in them, adapting it to his necessities. This fact is the beginning of concept and a particular environmental perception. Within this dynamics, taking care of the emic speeches, the hunter thinks of himself as a “true ecologist” due to the works that makes for the cinegetic fauna and its habitat. In addition the ecological confrontation to that “another” ecologism of associations and ecological groups to which they consider far anyway from the “natural reality”. The communication affects the hypothesis to consider that the perception as much as the performance comes determined by a concept of profitability, that the hunter and the companies of the sector activate according to the case by virtue of making profitable economically and/or recreationally the investment done. The figure of the hunter as “true ecologist” would be immersed in a dialectic one between an “atavic speech” and an economic conditioner.La caza supone en el conjunto del estado español una actividad que junto a su importancia económica juega un factor destacado en la actuación, modificación y conservación de espacios naturales. El cazador se convierte en agente activo que a través de una práctica secular influye sobre los acotados y en la biodiversidad existente en ellos, adaptándola a sus necesidades. Este hecho parte de un concepto y una percepción medioambiental particular. Dentro de esta dinámica, atendiendo a los discursos emic, el cazador se arroga la auto-definición de “verdadero ecologista” en virtud a los trabajos que realiza en pro de la fauna cinegética y su hábitat. A ello se une la confrontación a ese “otro” ecologismo de asociaciones y colectivos ecologistas a los que consideran alejados de la “realidad” natural. El texto incide en la hipótesis de considerar que tanto la percepción como la actuación vienen determinadas por un concepto de rentabilidad, que el cazador y las empresas del sector activan según el caso en virtud de rentabilizar económica y/o recreativamente la inversión realizada. La figura del cazador como “verdadero ecologista” quedaría inmersa en una dialéctica entre un “discurso atávico” y un condicionante económico

Digital Electrical Substation Communications based on Deterministic Time-Sensitive Networking over Ethernet

The authors would like to thank Alberto Sánchez Pérez and Grupo Cuerva S.L. for their assistance in the realization of the field tests at their electrical substation facility in Escúzar (Granada, Spain); and Jesús Torres Tenor and the CIRCE Foundation for their contribution to the development of a substation GOOSE traffic generator.This work presents a novel use case with Time-Sensitive Networks (TSN) for implementing a deterministic system allowing the joint transmission of all substation communications over the same Ethernet-based infrastructure. This approach streamlines the transition to Smart Grid by simplifying the typically complex architecture of electrical substations, characterized by multiple field buses and bridging devices. Thus, Smart Grid represents a disruptive innovation advancing substations to an “all-digital” environment with a uniform interface to access, manage, and update their communications and variables. TSN can serve as its underlying foundation as it is based on open, interoperable standards and enhancements for Ethernet that can establish deterministic communications with bounded end-to-end latency. This is shown with a TSN Proof of Concept (PoC) in a real-life substation that can integrate its most usual signals: digitized analog triggers for critical events or interlocks, GOOSE signaling (IEC 61850), and Best-Effort “Internet-like” traffic. This TSN PoC is shown to be versatile enough to propagate digitized critical events around 160 µs earlier than legacy substation equipment while preserving the integrity of background traffic. Furthermore, its flexibility was characterized in-depth in controlled laboratory tests, thereby confirming TSN as a viable alternative for supporting Smart Grid so long as the appropriate configuration is supplied.Amiga-7 Project RTI2018-096228-B-C3FITOPTIVIS Project H2020-RIA ECSEL-JU-2017-783162Spanish Ministerio de Economia y Transformacion Digital (MINECO) APCIN PCI2018-093184German Research Foundation (DFG

GAMES: A new Scenario for Software and Knowledge Reuse

Games are a well-known test bed for testing search algorithms and learning methods, and many authors have presented numerous reasons for the research in this area. Nevertheless, they have not received the attention they deserve as software projects. In this paper, we analyze the applicability of software and knowledge reuse in the games domain. In spite of the need to find a good evaluation function, search algorithms and interface design can be said to be the primary concerns. In addition, we will discuss the current state of the main statistical learning methods and how they can be addressed from a software engineering point of view. So, this paper proposes a reliable environment and adequate tools, necessary in order to achieve high levels of reuse in the games domain

Long-term evolution of strongly nonlinear internal solitary waves in a rotating channel

The evolution of internal solitary waves (ISWs) propagating in a rotating channel is studied numerically in the framework of a fully-nonlinear, nonhydrostatic numerical model. The aim of modelling efforts was the investigation of strongly-nonlinear effects, which are beyond the applicability of weakly nonlinear theories. Results reveal that small-amplitude waves and sufficiently strong ISWs evolve differently under the action of rotation. At the first stage of evolution an initially two-dimensional ISW transforms according to the scenario described by the rotation modified Kadomtsev-Petviashvili equation, namely, it starts to evolve into a Kelvin wave (with exponential decay of the wave amplitude across the channel) with front curved backwards. This transition is accompanied by a permanent radiation of secondary Poincaré waves attached to the leading wave. However, in a strongly-nonlinear limit not all the energy is transmitted to secondary radiated waves. Part of it returns to the leading wave as a result of nonlinear interactions with secondary Kelvin waves generated in the course of time. This leads to the formation of a slowly attenuating quasi-stationary system of leading Kelvin waves, capable of propagating for several hundreds hours as a localized wave packet. © 2009 Author(s)

Integrated model concept for district energy management optimisation platforms

District heating systems play a key role in reducing the aggregated heating and domestic hot water production energy consumption of European building stock. However, the operational strategies of these systems present further optimisation potential, as most of them are still operated according to reactive control strategies. To fully exploit the optimisation potential of these systems, their operations should instead be based on model predictive control strategies implemented through dedicated district energy management platforms. This paper describes a multiscale and multidomain integrated district model concept conceived to serve as the basis of an energy prediction engine for the district energy management platform developed in the framework of the MOEEBIUS project. The integrated district model is produced by taking advantage of co-simulation techniques to couple building (EnergyPlus) and district heating system (Modelica) physics-based models, while exploiting the potential provided by the functional mock-up interface standard. The district demand side is modelled through the combined use of physical building models and data-driven models developed through supervised machine learning techniques. Additionally, district production-side infrastructure modelling is simplified through a new Modelica library designed to allow a subsystem-based district model composition, reducing the time required for model development. The integrated district model and new Modelica library are successfully tested in the Stepa Stepanovic subnetwork of the city of Belgrade, demonstrating their capacity for evaluating the energy savings potential available in existing district heating systems, with a reduction of up to 21% of the aggregated subnetwork energy input and peak load reduction of 24.6%.The research activities leading to the described developments and results, were funded by the European Uniońs Horizon 2020 MOEEBIUS project, under grant agreement No 680517. Authors would like to ex-press their gratitude to the operator of the Vozdovac district heating system (Beogradske elektrane) for the specifications used to develop and calibrate the models, and to Solintel M&P, SL for developing the initial versions of the EnergyPlus models (including only the geometrical and constructive definition of the buildings), in the framework of the MOEEBIUS project

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El impacto de las tecnologías informáticas sobre la empresa de los 90

The enterprise of the nineties creates its own strategies in a competitive atmosphere characterísed by the spreading of Computer technology. The flexibílity that these technologies of information to the eompany bring forward, has implications all over the areas that constitute the business sector, not only over the productive area, but also over the organizational, fínancial and business ones, With this work we try to analysis and point out some of the main consequences that the adoption of these technologies brings about in a eompany, making an especial stand on those that affect the managerial function.L/entreprise des années 90 cree sa propre stratégie dans un environnement competitif characterisé par 1’enorme diffusion des technologies de I’information. La fléxibilité que ces technologies offrent á l’entreprise a des implications sur tous ses secteurs: organisation, finance, pro- duction, etc. Avec notre travail nous essayerons d ’aonaliser et raettre en évidence quelques des consequences principales qui ont pour Tentrepríse 1*adoption de ces technologies. Nous ínsistirons specialement sur celles qui affectent les fonctions managéríales

A comparison of simulation and hardware-in-the-loop alternatives for digital control of power converters

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. A. Sánchez, Á. de Castro, J. Garrido, "A Comparison of Simulation and Hardware-in-the- Loop Alternatives for Digital Control of Power Converters", IEEE Transactions on Industrial Informatics, vol. 8, no. 3, pp. 491 - 500, Aug. 2012Debugging digital controllers for power converters can be a problem because there are both digital and analog components. This paper focuses on debugging digital controllers to be implemented in Field Programmable Gate Arrays or Application Specific Integrated Circuits, which are designed in hardware description languages. Four methods are proposed and described. All of them allow simulation, and two methods also allow emulation-synthesizing the model of the converter to run the complete closed-loop system in actual hardware. The first method consists in using a mixed analog and digital simulator. This is the easiest alternative for the designer, but simulation time can be a problem, specially for long simulations like those necessary in power factor correction or when the controller is very complex, for example, with embedded processors. The alternative is to use pure digital models, generating a digital model of the power converter. Three methods are proposed: real type, float type and fixed point models (in the latter case including hand-coded and automatic-coded descriptions). Float and fixed point models are synthesizable, so emulation is possible, achieving speedups over 20 000. The results obtained with each method are presented, highlighting the advantages and disadvantages of each one. Apart from that, an analysis of the necessary resolution in the variables is presented, being the main conclusion that 32-bit floating point is not enough for medium and high switching frequencies