Piensa globalmente, actúa localmente: mapeo de la cultura libre en un sistema mediático híbrido

From the nineties, the Internet has been providing new political hybrid action forms. At the same time, some communities make a disruptive use of technologies aiming to subvert network power relationships at the current capitalized and centralized cyberspace. Addressing a collaborative mapping, we identified 290 free culture communities in Spain. Their characteristics suggest the relevance of offline spaces and local areas to deliberate, propose and perform political participation towards a neutral, centralised and free Internet.Desde los años noventa, el ciberespacio ha propuesto formas acción política híbrida. Asimismo, algunos colectivos realizan un uso disruptivo de las tecnologías para subvertir las relaciones de poder en la Red. Mediante un mapeo colaborativo, identificamos 290 grupos relacionados con la cultura libre en España. Sus características sugieren la relevancia de los espacios offline y de los territorios locales para deliberar y activarse políticamente a favor de un Internet libre

Lyapunov exponents and Oseledets decomposition in random dynamical systems generated by systems of delay differential equations

Producción CientíficaLinear skew-product semidynamical systems generated by random systems of delay differential equations are considered, both on a space of continuous functions as well as on a space of p-summable functions. The main result states that in both cases, the Lyapunov exponents are identical, and that the Oseledets decompositions are related by natural embeddings.NCN grant Maestro 2013/08/A/ST1/00275MICIIN/FEDER Grant RTI2018-096523-B-100H2020-MSCA-ITN-2014 643073 CRITICS

Preference stability along time: the time cohesiveness measure

This work introduces a non-traditional perspective about the problem of measuring the stability of agents’ preferences. Specifically, the cohesiveness of preferences at different moments of time is explored under the assumption of considering dichotomous evaluations. The general concept of time cohesiveness measure is introduced as well as a particular formulation based on the consideration of any two successive moments of time, the sequential time cohesiveness measure. Moreover, some properties of the novel measure are also provided. Finally, and in order to emphasize the adaptability of our proposal to real situations, a factual case of study about clinical decision-making is presented. Concretely, the study of preference stability for life-sustaining treatments of patients with advanced cancer at end of life is analysed. The research considers patients who express their opinions on three life-sustaining treatments at four consecutive periods of time. The novel measure provides information of patients preference stability along time and considers the possibility of cancer metastasesEste trabajo forma parte del proyecto de investigación con financiación nacional: MEC-FEDER Grant ECO2016-77900-

Pretreatment Processes of Biomass for Biorefineries: Current Status and Prospects

Producción CientíficaThis article seeks to be a handy document for the academy and the industry to get quickly up to speed on the current status and prospects of biomass pretreatment for biorefineries. It is divided into two biomass sources: vegetal and animal. Vegetal biomass is the material produced by plants on land or in water (algae), consuming sunlight, CO2, water, and soil nutrients. This includes residues or main products from, for example, intensive grass crops, forestry, and industrial and agricultural activities. Animal biomass is the residual biomass generated from the production of food from animals (e.g., manure and whey). This review does not mean to include every technology in the area, but it does evaluate physical pretreatments, microwave-assisted extraction, and water treatments for vegetal biomass. A general review is given for animal biomass based in physical, chemical, and biological pretreatments

A relativistic one dimensional band model with position dependent mass

Producción CientíficaIn this note a one-dimensional band model is proposed based on a periodic Dirac comb having a periodic mass distribution m(x). The mass function is represented as a Hermitian, non-local separable operator. Two specific cases–a constant mass model and a sinusoidal mass model–are examined. The lowest electron and positron bands for the constant mass case are similar to those for the standard relativistic Kronig-Penney model, suggesting that non-locality has little influence. The results for the sinusoidal case are consistent with the expectation that at low wavenumber an electron “feels” it has an average constant mass, but at high wave number, the particle “sees” the periodic mass variation and the band is distorted.Ministerio de Economía, Industria y Competitividad (project MTM2014-57129-C2-1-P)Junta de Castilla y León (project VA057U16

Broadband transverse susceptibility in multiferroic Y-type hexaferrite Ba0.5Sr1.5Zn2Fe12O22

Producción CientíficaNoncollinear spin systems with magnetically induced ferroelectricity from changes in spiral magnetic ordering have attracted significant interest in recent research due to their remarkable magnetoelectric effects with promising applications. Single phase multiferroics are of great interest for these new multifunctional devices, being Y-type hexaferrites good candidates, and among them the ZnY compounds due to their ordered magnetic behaviour over room temperature. Polycrystalline Y type hexaferrites with composition Ba0.5Sr1.5Zn2Fe2O22 (BSZFO) were sintered in 1050 °C–1250 °C temperature range. Transverse susceptibility measurements carried out on these BSZFO samples in the temperature range 80–350 K with DC fields up to ± 5000 Oe reveal different behaviour depending on the sintering temperature. Sample sintered at 1250 °C is qualitatively different, suggesting a mixed Y and Z phase like CoY hexaferrites. Sintering at lower temperatures produce single phase Y-type, but the transverse susceptibility behaviour of the sample sintered at 1150 °C is shifted at temperatures 15 K higher. Regarding the DC field sweeps the observed behaviour is a peak that shifts to lower values with increasing temperature, and the samples corresponding to single Y phase exhibit several maxima and minima in the 250 K–330 K range at low DC applied field as a result of the magnetic field induced spin transitions in this compound.Ministerio de Ciencia, Innovación y Universidades; Agencia Estatal de Investigación with FEDER (MAT2016-80784-P

At the roots of Europe: post-Synodal Apostolic Exhortation Ecclesia in Europe and the role of Ecclesiastical Archives

Between 1994 and 1999 the Catholic church promoted five special synods, one for each Continent of the Earth: Africa, America, Asia, Oceania and Europe. On June, 28, 2003, Pope John Paul II promulgated the post-synodal apostolic exhortation Ecclesia in Europa, addressed to the whole European Community in order to illustrate the results of the Synod of European Churches held in 1999. The document wanted to be a way for taking in consideration one’s own past and the Christian roots looking to provide the governance of the new Europe, especially in the perspective of the largest enlargement of the European Union planned between 2004 and 2007. Those cultural and Christian roots are readily available within the ecclesiastical archives of all European countries, a priceless patrimony which, after the Second Vatican Council, the Catholic church aimed to enhance more and more. The present work illustrates the main documents that led the Church to highlight the importance of the ecclesiastical archives in the European history by a brief analysis of the apostolic exhortation Ecclesia in Europa.Entre 1994 y 1999, la Iglesia Católica promovió cinco sínodos especiales, uno para cada Continente de la Tierra: África, América, Asia, Oceanía y Europa. El 28 de junio de 2003, el Papa Juan Pablo II promulgó la exhortación apostólica post-sinodal Ecclesia in Europa, dirigida a toda la Comunidad Europea, a instituciones y ciudadanos, para ilustrar los resultados del Sínodo de las Iglesias europeas. El documento quería ser una invitación a considerar su pasado, sus raíces cristianas, en el gobierno de la nueva Europa, especialmente en vista de la mayor ampliación de la Unión Europea planeada entre 2004 y 2007. Esas raíces culturales y cristianas están fácilmente disponibles en los archivos eclesiásticos de todos los países europeos, un patrimonio único y que, después del Concilio Vaticano II, la Iglesia católica ha mejorado mucho. La comunicación investiga los principales documentos que llevaron a la Iglesia a este importante camino de conocimiento de los archivos, también a la luz de un breve análisis del texto de la exhortación apostólica Ecclesia in Europa, con el fin de que la gente entienda el papel de los archivos eclesiásticos en la historia europea

Cayley-Klein Poisson Homogeneous Spaces

Producción CientíficaThe nine two-dimensional Cayley–Klein geometries are firstly reviewed by following a graded contraction approach. Each geometry is considered as a set of three symmetrical homogeneous spaces (of points and two kinds of lines), in such a manner that the graded contraction parameters determine their curvature and signature. Secondly, new Poisson homogeneous spaces are constructed by making use of certain Poisson–Lie structures on the corresponding motion groups. Therefore, the quantization of these spaces provides noncommutative analogues of the Cayley–Klein geometries. The kinematical interpretation for the semiRiemannian and pseudo-Riemannian Cayley–Klein geometries is emphasized, since they are just Newtonian and Lorentzian spacetimes of constant curvature.Ministerio de Ciencia, Innovación y Universidades (grant MTM2016-79639-P)European Cooperation in Science and Technology (COST Action MP1405 QSPACE

Understanding the role of MAM molecular weight in the production of PMMA/MAM nanocellular polymers

Nanostructured polymer blends with CO2-philic domains can be used to produce nanocellular materials with controlled nucleation. It is well known that this nanostructuration can be induced by the addition of a block copolymer poly(methyl methacrylate)-poly(butyl acrylate)-poly(methyl methacrylate) (MAM) to a poly(methyl methacrylate) (PMMA) matrix. However, the effect of the block copolymer molecular weight on the production of nanocellular materials is still unknown. In this work, this effect is analysed by using three types of MAM triblock copolymers with different molecular weights, and a fixed blend ratio of 90 wt% PMMA and 10 wt% of MAM. Blends were produced by extrusion. As a result of the extrusion process, a non-equilibrium nanostructuration takes place in the blends, and the micelle density increases as MAM molecular weight increases. Micelle formation is proposed to occur as result of two mechanisms: dispersion, controlled by the extrusion parameters and the relative viscosities of the polymers, and self-assembly of MAM molecules in the dispersed domains. On the other hand, in the nanocellular materials produced with these blends, cell size decreases from 200 to 120 nm as MAM molecular weight increases. Cell growth is suggested to be controlled by the intermicelle distance and limited by the cell wall thickness. Furthermore, a theoretical explanation of the mechanisms underlying the limited expansion of PMMA/MAM systems is proposed and discussed

Equilibrium strategies in a defined benefit pension plan game

Producción CientíficaWe study the optimal management of an aggregated overfunded pension plan of defined benefit type as a two-player noncooperative differential game. The model’s key fact is to consider the fund surplus as a strategic variable that makes the pension plan more attractive both for current and future participants. We let the worker participants to act collectively as a single player that claims a share of the surplus, and let the sponsoring firm act as the player that cares about the investment of the surplus fund assets. The union’s objective is to maximize the expected discounted utility of the extra benefits claimed. We solve this asymmetric game under two different assumptions on the preferences of the firm: in the first scenario, the firm aims to maximize expected discounted utility derived from fund surplus; while in the second scenario, the firm cares about minimizing the probability that the fund surplus reaches very low values.Este trabajo se ha hecho con ayuda de los proyectos del Ministerio de Economía Industria y Competitividad (Spain), ECO2017-86261-P , ECO2014-56384-P y MDM2014-0431, y de la Comunidad de Madrid MadEco-CM S2015/HUM-3444 y Comunidad de Castilla y León VA148G18