La reinvención del Paraguay. La operación historiográfica de Blas Garay sobre las misiones jesuíticas

Tras la Guerra contra la Triple Alianza, Paraguay quedó destruido a todo nivel, desde lo demográfico hasta lo económico. Lo identitario no podía quedar sin ser afectado. Hacia fines del siglo XIX surgirá una generación de intelectuales que re-escribirán la historia del Paraguay haciendo hincapié en los ítems donde la identidad estaba en juego. Uno de ellos era el referente a las Misiones Jesuíticas. Ante la acusación de parte de la ‘historiografía aliada’ que las tiranías pasadas se debían a la enseñanza jesuítica en la sumisión y la obediencia, los nuevos intelectuales, entre ellos Manuel Domínguez y fundamentalmente Blas Garay, construyeron un relato en donde el Paraguay nada heredaba de jesuitas ni estos se habían basado en la cultura guaraní al edificar sus célebres misiones. El texto de Blas Garay que apareció como prólogo a la obra traducida de Nicolás del Techo será el referente de esta nueva narración historiográfica.After the Triple Alliance War Paraguay was destroyed at all levels, from demographic to economic. Identity could not remain unaffected. A new generation of intellectuals arouse by the late nineteenth century aiming to re-write the history of Paraguay highlighting items where identity was at stake. One of those issues was related to the Jesuit Missions. Faced with the accusation from the 'allied historiography' that past tyrannies were due to Jesuit education in submission and obedience, the new intellectuals, including Manuel Dominguez and fundamentally Blas Garay, built a history in which Paraguay inherited nothing from the Jesuits, In fact, according with Garay, the Jesuits build their famous missions based not on the Guarani culture but in their own criteria. The text of Blas Garay appeared as a preface to the translated work of Nicolas del Techo will be the benchmark for this new historiographical narrative.Fil: Telesca, Ignacio. Universidad Nacional de Formosa; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Nordeste. Instituto de Investigaciones Geohistóricas (i); Argentin

A uniform estimate of the relative projection constant

The main goal of the paper is to provide a quantitative lower bound greater than $1$ for the relative projection constant $\lambda(Y, X)$, where $X$ is a subspace of $\ell_{2p}^m$ space and $Y \subset X$ is an arbitrary hyperplane. As a consequence, we establish that for every integer $n \geq 4$ there exists an $n$-dimensional normed space $X$ such that for an every hyperplane $Y$ and every projection $P:X \to Y$ the inequality $||P|| > 1 + \left (8 \left ( n + 3 \right )^{5} \right )^{-30(n+3)^2}$ holds. This gives a non-trivial lower bound in a variation of problem proposed by Bosznay and Garay in $1986$.Comment: 16 page

Antisymmetric Wilson loops in N= 4 SYM: from exact results to non-planar corrections

Indexación: Scopus.A.C. and A.F. were supported by Fondecyt # 1160282. supported by the I.N.F.N., research initiative STEFI.We consider the vacuum expectation values of 1/2-BPS circular Wilson loops in N= 4 super Yang-Mills theory in the totally antisymmetric representation of the gauge group U(N) or SU(N). Localization and matrix model techniques provide exact, but rather formal, expressions for these expectation values. In this paper we show how to extract the leading and sub-leading behavior in a 1/N expansion with fixed ’t Hooft coupling starting from these exact results. This is done by exploiting the relation between the generating function of antisymmetric Wilson loops and a finite-dimensional quantum system known as the truncated harmonic oscillator. Sum and integral representations for the 1/N terms are provided. © 2018, The Author(s).https://link.springer.com/article/10.1007%2FJHEP08%282018%2914

Synthesis of strontium ferrite/iron oxide exchange coupled nano-powders with improved energy product for rare earth free permanent magnet applications

We present a simple, scalable synthesis route for producing exchange coupled soft/hard magnetic composite powder that outperforms pure soft and hard phase constituents. Importantly, the composites is iron oxide based (SrFe12O19 and Fe3O4) and contain no rare earth or precious metal. The two step synthesis process consists of first precipitating, an Iron oxide/hydroxide precursor directly on top of SrFe12O19 nano-flakes, ensuring a very fine degree of mixing between the hard and the soft magnetic phases. We then use a second step that serves to reduce the precursor to create the proper soft magnetic phase and create the intimate interface necessary for exchange coupling. We establish a clear processing window; at temperatures below this window the desired soft phase is not produced, while higher temperatures result in deleterious reaction at the soft/hard phase interfaces, causing an improper ratio of soft to hard phases. Improvements of Mr, Ms, and (BH)max are 42%, 29% and 37% respectively in the SrFe12O19/Fe3O4 composite compared to pure hard phase (SrFe12O19). We provide evidence of coupling (exchange spring behavior) with hysteresis curves, first order reversal curve (FORC) analysis and recoil measurements.Comment: in J. Mater. Chem. C, 201

Argentine Afterlives: Race, Hemispheric Comparison, and Translation in Benjamín de Garay’s Los sertones

This article considers Argentine Benjamín de Garay’s 1938 Spanish translation of Brazilian Euclides da Cunha’s 1902 Os Sertões as a transnational meditation on racialized processes of nation formation in South America. The translation paradoxically frames the linguistic and historical relationships between Brazil and Argentina in terms of both similarity and difference. While de Garay stresses the parallels between Brazil and Argentina in his translator’s prologue, he also includes a glossary of supposedly untranslatable Portuguese terms, suggesting incommensurability between the two national experiences. Tellingly, many of the glossary’s terms refer to racial categories. In this way, the de Garay text acts as a reflection on the divergent paths that Argentina and Brazil take in treating racial heterogeneity in their respective national narratives

Solar Neutrinos

The study of solar neutrinos has given since ever a fundamental contribution both to astroparticle and to elementary particle physics, offering an ideal test of solar models and offering at the same time relevant indications on the fundamental interactions among particles. After reviewing the striking results of the last two decades, which were determinant to solve the long standing solar neutrino puzzle and refine the Standard Solar Model, we focus our attention on the more recent results in this field and on the experiments presently running or planned for the near future. The main focus at the moment is to improve the knowledge of the mass and mixing pattern and especially to study in detail the lowest energy part of the spectrum, which represents most of solar neutrino spectrum but is still a partially unexplored realm. We discuss this research project and the way in which present and future experiments could contribute to make the theoretical framemork more complete and stable, understanding the origin of some "anomalies" that seem to emerge from the data and contributing to answer some present questions, like the exact mechanism of the vacuum to matter transition and the solution of the so called solar metallicity problem.Comment: 51 pages, to be published in Special Issue on Neutrino Physics, Advances in High Energy Physics Hindawi Publishing Corporation 201