Searches for vector-like quarks and ttˉt\bar{t} resonances with the ATLAS detector

Searches for vector-like quarks and $t\bar{t}$ resonances are performed with the ATLAS experiment at the Large Hadron Collider using an integrated luminosity of 14.3~fb$^{-1}$ of proton-proton collisions recorded in 2012 at a center-of-mass energy of $\sqrt{s} =$ 8~TeV. Several final states have been exploited to carry out these searches such as lepton plus jets and opposite and same-sign dilepton final states. No significant excess of events above the Standard Model expectation is observed, and upper limits at 95$\%$ CL are derived for vector-like quarks of various masses in a two-dimensional plane of branching ratios, and for $t\bar{t}$ resonances in two benchmark models, a topcolor leptophobic $Z'$ and a Kaluza-Klein gluon.Comment: 6 pages, 3 figures, Proceedings of The Second Annual Conference on Large Hadron Collider Physics, Columbia University, New York, U.S.A, June 2-7, 201

The higher topological complexity of subcomplexes of products of spheres---and related polyhedral product spaces

We construct "higher" motion planners for automated systems whose space of states are homotopy equivalent to a polyhedral product space $Z(K,\{(S^{k_i},\star)\})$, e.g. robot arms with restrictions on the possible combinations of simultaneously moving nodes. Our construction is shown to be optimal by explicit cohomology calculations. The higher topological complexity of other families of polyhedral product spaces is also determined.Comment: 30 pages. This second version of the paper extends the results of the first version to the case of polyhedral product spaces $Z(K,\{(S^{k_i},\star)\})$ where no restriction is assumed on the sphere dimensions $k_i

Comparison Between Bayesian and Frequentist Tail Probability Estimates

In this paper, we investigate the reasons that the Bayesian estimator of the tail probability is always higher than the frequentist estimator. Sufficient conditions for this phenomenon are established both by using Jensen's Inequality and by looking at Taylor series approximations, both of which point to the convexity of the distribution function

FUZZY COMPARATIVE CONCORDANCE ANALYSIS. Proposal and evaluation by a case study

In this paper it is proposed a fuzzy multiple attribute analysis, that we have called comparative concordance, as a help instrument to the decision-making process in an environment of lack of precise information as it generally is the decision-making in regional planning. Through an application to the selection of proceeding programs of the Environmental Plan of Andalusia, 1995-2000, it will be compared to other methods.fuzzy sets, multiple attribute decision, environmental planning

Relations between Spain and post‐Mubarak Egypt (2011‐2015)

En este artículo se presenta un estudio sobre la política exterior española hacia Egipto tras la caída del presidente Hosni Mubarak en febrero de 2011. La respuesta dada por la diplomacia española a las transformaciones políticas que se iniciaron en Egipto a partir de esa fecha, no se ha diferenciado, en líneas generales, a la desarrollada por la diplomacia europea. Esta se ha basado en un primer momento en la prudencia, para pasar posteriormente al pragmatismo, y en algunos casos a la improvisación, ante los sucesivos gobiernos tras el derrocamiento de Mubarak, así como en un comportamiento a remolque según se iban sucediendo los acontecimientos. Desde 2014, se percibe por parte de la diplomacia española y europea un retorno a las políticas basadas en cuestiones securitarias y financieras, como las desarrolladas bajo la presidencia de Mubarak, en las que se apostaba por gobernantes “fuertes” que garantizasen la estabilidad en la zona mientras se alejaba el foco de la sociedad civilThis article presents a study of Spanish foreign policy towards Egypt after the fall of President Hosni Mubarak in February 2011. Generally speaking, the Spanish diplomatic response to the political transformations that began in Egypt at that time differed little from the European diplomatic response. At first it was based on prudence and then at a later stage on pragmatism, with occasional cases of improvisation in the face of the successive governments that followed Mubarak’s overthrow and some reactions in the wake of various events. Since December 2014, the focus of Spanish and European diplomacy has returned to security and financial matters, with policies similar to those during the Mubarak presidency, an emphasis on supporting ‘strong’ leaders who guarantee stability in the area and less attention on civil societ

Tendencias actuales de la afiliación sindical en Argentina: evidencias de una encuesta a empresas

Este artículo analiza el aumento de trabajadores afiliados y la recuperación de la tasa de afiliación en relación a otros períodos históricos, en particular los años 1990 en la Argentina, en un contexto generalizado de caída de ese indicador en gran parte de los países desarrollados de la OCDE.La pregunta central que orienta el estudio refiere a conocer: ¿Qué factores explican la incipiente recuperación de la tasa de afiliación sindical? La respuesta a este interrogante se inscribe en una serie de debates nacionales e internacionales acerca de la definición de la afiliación sindical, su medición (o elaboración), su significado y particularmente los factores endógenos o exógenos que inciden en los trabajadores a afiliarse. En este sentido, la literatura reconoce factores exógenos al sindicato, como los económicos (Bain y Elsheikh, 1976; Metcalf, 2005; Visser, 2006), políticos (Wallerstein y Western, 2000; Frege y Kelly, 2003) y jurídico institucional (Freeman y Pelletier, 1990). En cuanto a los factores endógenos, se hace referencia a las técnicas de reclutamiento y estructura organizativa de los sindicatos (Undy et al., 1981; Herry, 2006). La información utilizada proviene de una encuesta de Relaciones Laborales realizada por el Ministerio de Trabajo, Empleo y Seguridad Social. La muestra comprende 1.553 empresas, representativas de un universo total de 53.038 firmas que emplean a 2.450.400 asalariados.Los resultados de la investigación revelan que los factores exógenos de orden jurídico institucional se han mantenido sin alteraciones durante décadas, sin embargo la tasa de afiliación cae durante los 1990 y se recupera a partir de 2003. La principal hipótesis del trabajo es que esta recuperación de la tasa de afiliación y aumento de afiliados se debe fundamentalmente a factores exógenos de orden político y económico como el aliento a la afiliación, el aumento general del empleo registrado y la expansión de la negociación colectiva.This article analyzes the reasons for the increase in the number of affiliated workers and the upsurge in the unionization rate in Argentina, in relation to other historical periods, in particular the 90s, in a generalized context of a drop in this indicator in a large proportion of OECD countries. The main question which directs this study is the following: which factors explain the sudden increase in the unionization rate? The answer to this question is part of a series of national and international debates on the definition of union affiliation, its measurement (or its definition), its meaning and particularly the endogenous and exogenous factors that encourage workers to affiliate.The literature recognizes the existence of explanatory factors exogenous to the union, such as economic (Bain and Elsheikh, 1976; Metcalf, 2005; Visser, 2006), political (Wallerstein and Western, 2000; Frege and Kelly, 2003), and judicial institutional factors (Freeman and Pelletier, 1990). As for endogenous factors, these refer to recruitment techniques, and the organizational structure of unions (Undy et al., 1981; Herry, 2006). The information used comes from an inquiry on labour relations carried out by the Ministry of Labour, Employment and Social Security. The sample includes 1,553 businesses, representative of a total universe of 53,038 businesses employing 2,450,400 salaried employees.The research results reveal that even if exogenous judicial institutional factors were stable for decades, the unionization rate nevertheless fell during the 90s, and then went up again beginning in 2003. The main working hypothesis is that this recovery in the unionization rate and the increase in the number of unionized workers are fundamentally due to exogenous factors of a political and economic nature such as support for unionization, the general increase recorded in employment, and the expansion of collective bargaining.Cet article analyse les raisons de l’augmentation du nombre de travailleurs affiliés et la recrudescence du taux de syndicalisation en Argentine, par rapport à d’autres périodes historiques, en particulier les années 1990, dans un contexte généralisé de chute de cet indicateur dans une grande partie des pays de l’OCDE. La principale question qui oriente cette étude est la suivante : quels facteurs expliquent l’augmentation soudaine du taux de syndicalisation ? La réponse à cette question s’inscrit dans une série de débats nationaux et internationaux sur la définition de l’affiliation syndicale, sa mesure (ou sa définition), sa signification et particulièrement les facteurs endogènes ou exogènes qui incitent les travailleurs à se syndiquer.La littérature reconnaît l’existence de facteurs explicatifs exogènes au syndicat, comme les facteurs économiques (Bain et Elsheikh, 1976; Metcalf, 2005; Visser, 2006), politiques (Wallerstein et Western, 2000; Frege et Kelly, 2003) et juridiques ou institutionnels (Freeman et Pelletier, 1990). Quant aux facteurs endogènes, ils réfèrent aux techniques de recrutement et à la structure organisationnelle des syndicats (Undy et al., 1981; Herry, 2006). L’information utilisée provient d’une enquête sur les relations du travail effectuée par le ministère du Travail, de l’Emploi et de la Sécurité sociale. L’échantillon comprend 1 553 entreprises, représentatives d’un univers total de 53 038 entreprises qui emploient 2 450 400 employés salariés.Les résultats de la recherche révèlent que même si les facteurs exogènes d’ordre juridique ou institutionnel ont été stables durant des décennies, le taux de syndicalisation a toutefois chuté pendant les années 1990 et il est remonté à partir de 2003. La principale hypothèse de notre étude est que cette récupération du taux de syndicalisation et l’augmentation du nombre de travailleurs syndiqués sont fondamentalement dus à des facteurs exogènes d’ordre politique et économique comme l’appui à la syndicalisation, l’augmentation générale de l’emploi enregistré et l’expansion de la négociation collective