Public Libraries: techno trends and collective memory

By public library I mean here a library providing some kind of universal access to its assets, one whose readership isn’t exclusively tied and restricted to a particular organization – including the generally called public libraries, but also many specialized libraries, such as the academic of the open kind. Despite all efforts, public libraries continue to face strong barriers to their participation in the information society. Participants of the World Meeting on the Future of the ISIS Software recognized that “the ISIS Software Family has a unique technological concept and developmental mission to cope with Information Storage and Retrieval Systems (ISRS), particularly for developing countries where the technology is widely known and used; that the ISIS Software Family has now fully embraced the Free and Open Source Software approach and the support of UNICODE structures to be fully open and multilingual” (Rio Declaration 2008), restating thus the persistent relevance of this software family. OSS (Coar 2006) is defined as software whose source code is freely available, therefore allowing for free inspection and/or utilization, i.e., it is available for study and use by everyone without any payment or any other barrier to access. the lack of technical skill in libraries, a situation that libraries share with much of the public and cultural sectors. The study of OSS ILS, and of the their adaptation to the needs of specific public libraries may be the solution to this. Library Management Systems) that enhances digital archive interoperability between a diverse range of libraries

[Review of] Mariano Azuela. The Underdogs

The Underdogs (Los De Abajo) is a classic novel of the Mexican Revolution. The foreword briefly covers Mexican history, from Spanish Conquest to Independence to Revolution. Its purpose is to focus upon the main sociopolitical and economic problems of the Mexican Revolution

An Einstein-like theory of gravity with a non-newtonian weak-field limit

We propose a model describing Einstein gravity coupled to a scalar field with an exponential potential. We show that the weak-field limit of the model has static solutions given by a gravitational potential behaving for large distances as \ln r . The Newtonian term GM/r appears only as subleading. Our model can be used to give a phenomenological explanation of the rotation curves of the galaxies without postulating the presence of dark matter. This can be achieved only by giving up at galactic scales Einstein equivalence principle.Comment: Final version, accepted for publication on General Relativity and Gravitatio

Acoustic analogs of two-dimensional black holes

We present a general method for constructing acoustic analogs of the black hole solutions of two-dimensional (2D) dilaton gravity. Because by dimensional reduction every spherically symmetric, four-dimensional (4D) black hole admits a 2D description, the method can be also used to construct analogue models of 4D black holes. We also show that after fixing the gauge degrees of freedom the 2D gravitational dynamics is equivalent to an one-dimensional fluid dynamics. This enables us to find a natural definition of mass $M$, temperature $T$ and entropy $S$ of the acoustic black hole. In particular the first principle of thermodynamics $dM=TdS$ becomes a consequence of the fluid dynamics equations. We also discuss the general solutions of the fluid dynamics and two particular cases, the 2D Anti-de sitter black hole and the 4D Schwarzschild black hole.Comment: some references adde

Social theory and the analysis of transactions

Este artículo analiza una seria objeción a las teorías sociales que apoyan los mecanismos apagados y las fuerzas escondidas que, a su vez, influyen en los actores sociales: ellas destacan la necesidad teórica de confirmar sus presuposiciones tanto si ellas son demostradas como si son desmentidas por los fenómenos en los que ellas mismas se centran. En primer lugar, el autor examina cómo Latour ha puesto en evidencia decididamente este problema. Se trata, pues, de uno de los objetivos polémicos principales de Latour, la teoría social de Bourdieu, para demostrar que, en realidad, Bourdieu compartió las preocupaciones de Latour. Este artículo lleva a cabo este objetivo deteniéndose en la relación entre la noción de rule-following de Wittgenstein y la de habitus de Bourdieu. En la base de este análisis, el autor profundiza el concepto de transactions, que atañe a las interpretaciones discursivas de los actores y al contexto semiótico en los que se insertan. Este análisis finaliza con las consecuencias teóricopolíticas de este tipo de metodología.This article discusses a serious objection to social theories that claim opaque mechanisms and hidden forces operate over social actors’ head: they bespeak the theorists’ need to confirm their presuppositions whether they are proven or disproven by the phenomena they focus on. The author first explores the way in which Latour has convincingly unearthed this problem. He then analyzes one of Latour’s primary polemical targets, Bourdieu’s social theory, to show that in reality Bourdieu shared Latour’s concerns. The article does so by exploring the nexus between Wittgenstein’s notion of rule-following and notion of Bourdieu’s habitus. Based on this analysis, the author elaborates on the concept of “transactions”, which draws attention to both the actors’ discursive performances and the semiotic context where they take place. The article concludes by illustrating the theoretical-political consequences of this methodological commitment

Expected Shortfall is jointly elicitable with Value at Risk - Implications for backtesting

In this note, we comment on the relevance of elicitability for backtesting risk measure estimates. In particular, we propose the use of Diebold-Mariano tests, and show how they can be implemented for Expected Shortfall (ES), based on the recent result of Fissler and Ziegel (2015) that ES is jointly elicitable with Value at Risk