Relaxation methods for solving linear inequality systems: Converging results

The problem of finding a feasible solution to a linear inequality system arises in numerous contexts. In [12] an algorithm, called extended relaxation method, that solves the feasibility problem, has been proposed by the authors. Convergence of the algorithm has been proven. In this paper, we onsider a class of extended relaxation methods depending on a parameter and prove their convergence. Numerical experiments have been provided, as well.

Dipolo impreso para aplicaciones Wi-fi y caracterización de la ganancia por medio de la celda TEM

Este trabajo recoge el estudio, diseño, fabricación y análisis de dos dipolos de media onda para aplicaciones Wi-fi, con objeto de caracterizar sus respectivas ganancias mediante el uso de dos sistemas de medida distintos, el primero basado en el análisis del balance de enlace entre antenas mediante un analizador de redes y el segundo mediante una celda TEM. Para obtener un correcto funcionamiento de los dipolos, resulta de vital importancia conseguir un buen ajuste de las dimensiones de los mismos durante el desarrollo práctico del proyecto, consiguiendo una máxima transferencia de potencia y un ancho de banda suficientemente amplio para asegurar que las antenas presenten una buena adaptación en la banda de los 2.4 GHz – 2.5 GHz.

Modelling of Mercury’s surface composition and remote detection from the orbit with the BepiColombo Mercury Planetary Orbiter

It can be assumed that the composition of Mercury’s thin gas envelope (exosphere) is related to thecomposition of the planets crustal materials. If this relationship is true, then inferences regarding the bulkchemistry of the planet might be made from a thorough exospheric study. The most vexing of allunsolved problems is the uncertainty in the source of each component. Historically, it has been believedthat H and He come primarily from the solar wind, while Na and K originate from volatilized materialspartitioned between Mercury’s crust and meteoritic impactors. The processes that eject atoms andmolecules into the exosphere of Mercury are generally considered to be thermal vaporization, photonstimulateddesorption (PSD), impact vaporization, and ion sputtering. Each of these processes has its owntemporal and spatial dependence. The exosphere is strongly influenced by Mercury’s highly ellipticalorbit and rapid orbital speed. As a consequence the surface undergoes large fluctuations in temperatureand experiences differences of insolation with longitude. We will discuss these processes but focus moreon the expected surface composition and solar wind particle sputtering which releases material like Caand other elements from the surface minerals and discuss the relevance of composition modelling

Determination and characterization of quinolones in foodstuffs of animal origin by CE-UV, LC-UV, LC-Fl, LC-MS and LC-MS/MS

In this work methods for the multiresidue determination of the series of quinolones include in the European regulation in food of animal origin are de veloped and validated in line with Commission Decision 2002/657/EC in terms of linearity, decision limit, capability detection, precision and stability. Mult iresidue methods were established to allow the determination of quinolones covered by EU legislation in 2377/90/EC in muscle of chicken, turkey, pig and cow, plasma of cow and pig, liver of pig and milk of cow. First an extraction step was optimized and a SPE step was applied to clean!up and preconcentrate quinolones prior to their separation by CE or LC and determination by CE!UV, LC!UV, LC!Fl, LC!MS with different ion sources (ESI ,ApCI) and different mass analyser (Q, ToF) and LC!E SI!QqQ tandem mass spectrometry. The limits of quantification obtained are always lower than Maxim um Residue Limit (MRL) established by EU for quinolones in animal products and they can be applied to the control of quinolones in foodstuffs of animal origin . Finally the proposed methods were applied to determine quinolones in samples of turkey and pig muscle, pig plasma and milk of cow. Excellent quality parameters and reduced time of analysis were obtained when LC!ESI!MS/MS is used, although the others techniques presented too satisfactory results.

BioSuper: A web tool for the superimposition of biomolecules and assemblies with rotational symmetry

Background Most of the proteins in the Protein Data Bank (PDB) are oligomeric complexes consisting of two or more subunits that associate by rotational or helical symmetries. Despite the myriad of superimposition tools in the literature, we could not find any able to account for rotational symmetry and display the graphical results in the web browser. Results BioSuper is a free web server that superimposes and calculates the root mean square deviation (RMSD) of protein complexes displaying rotational symmetry. To the best of our knowledge, BioSuper is the first tool of its kind that provides immediate interactive visualization of the graphical results in the browser, biomolecule generator capabilities, different levels of atom selection, sequence-dependent and structure-based superimposition types, and is the only web tool that takes into account the equivalence of atoms in side chains displaying symmetry ambiguity. BioSuper uses ICM program functionality as a core for the superimpositions and displays the results as text, HTML tables and 3D interactive molecular objects that can be visualized in the browser or in Android and iOS platforms with a free plugin. Conclusions BioSuper is a fast and functional tool that allows for pairwise superimposition of proteins and assemblies displaying rotational symmetry. The web server was created after our own frustration when attempting to superimpose flexible oligomers. We strongly believe that its user-friendly and functional design will be of great interest for structural and computational biologists who need to superimpose oligomeric proteins (or any protein). BioSuper web server is freely available to all users at http://ablab.ucsd.edu/BioSuper webcite.

Estudi tècnic dels Cartells de la Festa Major de Vilafranca del Penedès del VINSEUM

L'octubre de 2010 es va iniciar un estudi sobre els cartells de la Festa Majar de Vilafranca que esconserven al Centre de Documentació del Museu de les Cultures del Vi de Catalunya (CDV i VINSEUM)de Vilafranca del Penedes. Aquests cartells són part de la documentació grafica que genera aquestafesta i cronológicament se situen entre el 1907 i el 2007.El treball es va dur a terme mitjanc;ant conven i entre el Museu i la Universitat de Barcelona per ala real ització del Practicum del Máster en Direcció de Projectes de Conservació-Restauració ambI'objectiu d'estudiar I'estat de conservació de la Col·lecció de Cartells del CDV i propasar un seguit derecomanacions practiques per a la seva preservació futura.L'interes que va generar aquest primer estudi va donar pas a la necessitat d'aprofundir en lescaracterístiques tecniques deis Cartells de la Col ·lecció. A més, el fet de poder estudiar una col·leccióde cartells cronológicament correlatius i fets en un mateix Iloc geografic, Catalunya, permetria coneixerI'evo!ució tant de les tecniques d'impressió com deis materials utilitzats en la producció de cartells.En I'estudi es plantejaven dos obj ectius principals: en primer lIoc, recollir el maxim d'informaciósobre els mat erials i les tecniques deis cartells; i en segon, plantej ar la possibi litat de relacionarels diferents materials deis cartells amb el seu estat de conservació, intent ant posar de manifest sirealment els elements constitutius del paper I'havien afectat i si ho feien de la mateixa manera endiferents exemplars.

Afrontamiento de situaciones de hostilidad y desempeño de la función directiva. Planteamientos y reflexiones a raíz de una actividad de formación permanente de directivos de centros educativos de titularidad pública

The intervention in the organized conflicts and, particularly, the confrontation of hostile situations (based on the emotional alteration, the strain, the verbal aggressiveness, etc) is one of the aspects that worry the principals of the educative centres and, therefore, a main attention must be given to the initial and permanent training to have managing duties. Throughout the text we take some aspects into account in the development of these managing skills:a) we set the distinctive features; b) we answer to the dilemma about the existence of improvement possibilities; c) we state the need to star from the motivation and the active participation of the principals in their own personal development and, finally, d) we contribute with the design of a training activity to develop skills to confront hostile situations, addressed to the principals of primary and secondary schools, that was done in Girona, in November 2005

Design and evaluation of learning algorithms for dynamic resource management in virtual networks

Network virtualisation is considerably gaining attentionas a solution to ossification of the Internet. However, thesuccess of network virtualisation will depend in part on how efficientlythe virtual networks utilise substrate network resources.In this paper, we propose a machine learning-based approachto virtual network resource management. We propose to modelthe substrate network as a decentralised system and introducea learning algorithm in each substrate node and substrate link,providing self-organization capabilities. We propose a multiagentlearning algorithm that carries out the substrate network resourcemanagement in a coordinated and decentralised way. The taskof these agents is to use evaluative feedback to learn an optimalpolicy so as to dynamically allocate network resources to virtualnodes and links. The agents ensure that while the virtual networkshave the resources they need at any given time, only the requiredresources are reserved for this purpose. Simulations show thatour dynamic approach significantly improves the virtual networkacceptance ratio and the maximum number of accepted virtualnetwork requests at any time while ensuring that virtual networkquality of service requirements such as packet drop rate andvirtual link delay are not affected.

La crisi del segle III, preludi de la fi del món antic

[cat] L'any 235, quan Alexandre Sever fou occit per Maximí el Traci, es va inaugurar una «crisi» caracteritzada per una anarquia militar i per tot un seguit de crisis derivades i interconnectades entre elles: la politicoinstitucional, la militar, l'econòmica i la religiosa. Tradicionalment, es considera que aquest període es va cloure amb la pujada al tron de Dioclecià, l'any 284. Aquest emperador va instaurar un nou sistema polític, conegut per tetrarquia, que va permetre que quatre emperadors governessin al mateix temps però en plena concòrdia, gràcies al qual es va poder aplicar amb més eficàcia el cúmul de reformes que Dioclecià va posar en marxa per a redreçar l'Imperi. Ara bé, aquestes reformes tingueren un alt cost social i polític: una concepció teocràtica del poder que sacralitzava l'emperador i assimilava la seva funció de govern com una missió divina.