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Re-construyendo la novela para un nuevo milenio. Postestructuralismo, discurso, lectura, autoría e hipertextualidad ante los nuevos caminos de la novela
álvaro Llosa Sanz
Caracteres : Estudios Culturales y Críticos de la Esfera Digital , 2012,
Abstract: Poststructuralism has influenced novelistic creations along the last forty years, in such a way that novels are changing their linear structure. I would like to describe the importance of some fundamental points of poststructuralism in the structure of three different novels from diverse spanish and international authors who wrote between the 60s and 80s. I will describe the important role played on each by the plot, the author and narrator, and also the reader, whose importance has grown after the apparition of the reader-oriented theories.
Comment on "Canonical formalism for Lagrangians with nonlocality of finite extent"
J. Llosa
Physics , 2002, DOI: 10.1103/PhysRevA.67.016101
Abstract: We show by some counterexamples that Lagrangian sysytems with nonlocality of finite extent are not necessarily unstable.
Matter and Ricci collineations
Josep Llosa
Physics , 2013,
Abstract: The infinitesimal transformations that leave invariant a two-covariant symmetric tensor are studied. The interest of these symmetry transformations lays in the fact that this class of tensors includes the energy-momentum and Ricci tensors. We find that in most cases the class of infinitesimal generators of these transformations is a finite dimensional Lie algebra but also, in some cases exhibiting a higher degree of degeneracy, this class is infinite dimensional and may fail to be a Lie algebra.
Yet another derivation of special relativity transformations without the second postulate
Josep Llosa
Physics , 2014,
Abstract: The most general transformation connecting inertial frames is derived from rather general and simple assumptions, without the postulate of constancy of the speed of light in vacuo.
Los moluscos terrestres (Mollusca: Gastropoda) de Costa Rica: clasificación, distribución y conservación
Barrientos Llosa,Zaidett;
Revista de Biología Tropical , 2010,
Abstract: terrestrial mollusks (mollusca: gastropoda) of costa rica: classification, distribution and conservation. terrestrial mollusks are poorly known worldwide. the country has 183 reported species, 30% endemic and 7% are probably extinct. about 400 species are expected to inhabit the country. biology, ecology, distribution, genetics and other areas of research are unknown for more than 95% of the species. the most diverse families are spiraxidae, orthalicidae and subulinidae. however, the family that may have more species is euconulidae. euconulids inhabit the highlands, where less work has been done. the study of species of highlands will also rise the endemism rate. future taxonomic, biological and ecological work should consider their low vagility, tendency to produce new taxa in sympatry, specific microhabitat requirements, hermaphroditism, high evolutionary rate (10% per million years), and divergence between species (2 to 30%). urgent studies to protect the costa rican malacofauna include: distribution, abundance, effect of land use and climate changes on populations. rev. biol. trop. 58 (4): 1165-1175. epub 2010 december 01.
Bicentenarios digitales: celebraciones en la red
Alvar de la Llosa
Historia Actual Online , 2011,
Abstract: Si la celebración del primer centenario de las independencias de los países americanos se valió de las innovaciones de los medios de comunicación de su época, en particular del cine, hoy en día los gobiernos han asaltado la Red y se han apoderado del media para difundir una versión oficial. Conviene por lo tanto ver cómo los diferentes países latinoamericanos construyen este Bicentenario siempre de modo nacional y unilateral y nunca transnacional, en el marco de unas fronteras modernas a pesar de un pasado común entre varias naciones. Palabras clave: Internet, bicentenario, Latinoamérica. ___________________________ Abstract: The celebration of the first centenary of independence of american countries used the innovations of the mass media of it time, particulary the movie world. Today, the governements stormed Internet and taked possession of the media to spread an official version. It′s necesary, consequently, to analyse how the different latin american countries build this Centenary, always national, never like a transnational perspective, in the context of the modern frontiers and the common past. Keywords: Internet, bicentenary, Latin America
1968 en América Latina: aparición de nuevos actores
Alvar De la Llosa
Historia Actual Online , 2009,
Abstract: Más allá de reivindicaciones y protestas semejantes a las que se desarrollan en Europa y en el mundo, el a o 1968 en América Latina se caracteriza por la aparición de nuevos actores (jóvenes, clases medias, feminismo, Iglesia, sindicatos). Los nuevos actores tienden a ocupar el hueco dejado por actores tradicionales que, en el seno de sociedades debilitadas por la crisis económica, ya no consiguen desempe ar su papel de actores democráticos. La organización de las Olimpiadas en México y la visita papal en Colombia prueban hasta qué punto la región es integrada al mundo moderno. Pero en México como en Argentina la prepotencia de gobiernos que se niegan al diálogo provoca choques violentos. 1968 está también marcado por opciones represivas que anuncian la acción violenta de los estados terroristas que 5 a os más tarde conquistarán el poder mediante golpes de estado.
Los moluscos terrestres (Mollusca: Gastropoda) de Costa Rica: clasificación, distribución y conservación
Zaidett Barrientos Llosa
Revista de Biología Tropical , 2010,
Abstract: Los moluscos terrestres son un grupo muy poco estudiado a nivel mundial. Hay 183 especies reportadas para Costa Rica, 30% son endémicas y 7% posiblemente están extintas. Se espera que en el país haya alrededor de 400 especies, de más del 95% se desconoce su biología, ecología, distribución, genética y otros campos de estudio. En Costa Rica las familias con mayor número de especies son Spiraxidae, Orthalicidae y Subulinidae. No obstante, es posible que Euconulidae sea aun más diversa, pues habitan las zonas altas del país que es en donde menos trabajo se ha hecho. El estudio de regiones altas aumentará el porcentaje de endemismo. Los futuros trabajos malacológicos taxonómicos, biológicos y ecológicos deben considerar la poca movilidad de este grupo, su tendencia a formar especies nuevas en simpatría, la especificidad de requerimientos de microhábitat, el hermafroditismo, la alta tasa de evolución (10% por millón de a os) y la divergencia entre especies (2-30%). Para proteger adecuadamente la biodiversidad de la malacofauna costarricense, se requiere de estudios que determinen la distribución y abundancia de las especies y el efecto del uso de la tierra y del climático. Terrestrial mollusks (Mollusca: Gastropoda) of Costa Rica: classification, distribution and conservation. Terrestrial mollusks are poorly known worldwide. The country has 183 reported species, 30% endemic and 7% are probably extinct. About 400 species are expected to inhabit the country. Biology, ecology, distribution, genetics and other areas of research are unknown for more than 95% of the species. The most diverse families are Spiraxidae, Orthalicidae and Subulinidae. However, the family that may have more species is Euconulidae. Euconulids inhabit the highlands, where less work has been done. The study of species of highlands will also rise the endemism rate. Future taxonomic, biological and ecological work should consider their low vagility, tendency to produce new taxa in sympatry, specific microhabitat requirements, hermaphroditism, high evolutionary rate (10% per million years), and divergence between species (2 to 30%). Urgent studies to protect the Costa Rican malacofauna include: distribution, abundance, effect of land use and climate changes on populations. Rev. Biol. Trop. 58 (4): 1165-1175. Epub 2010 December 01.
Flat deformation of a spacetime admitting two Killing fields
Josep Llosa,Jaume Carot
Physics , 2009, DOI: 10.1088/0264-9381/27/24/245006
Abstract: It is shown that given an analytic Lorentzian metric on a 4-manifold, $g$, which admits two Killing vector fields, then it exists a local deformation law $\eta = a g + b H$, where $H$ is a 2-dimensional projector, such that $\eta$ is flat and admits the same Killing vectors. We also characterize the particular case when the projector $H$ coincides with the quotient metric. We apply some of our results to general stationary axisymmetric spacetimes
Flat deformation theorem and symmetries in spacetime
Josep Llosa,Jaume Carot
Physics , 2008, DOI: 10.1088/0264-9381/26/5/055013
Abstract: The \emph{flat deformation theorem} states that given a semi-Riemannian analytic metric $g$ on a manifold, locally there always exists a two-form $F$, a scalar function $c$, and an arbitrarily prescribed scalar constraint depending on the point $x$ of the manifold and on $F$ and $c$, say $\Psi (c, F, x)=0$, such that the \emph{deformed metric} $\eta = cg -\epsilon F^2$ is semi-Riemannian and flat. In this paper we first show that the above result implies that every (Lorentzian analytic) metric $g$ may be written in the \emph{extended Kerr-Schild form}, namely $\eta_{ab} := a g_{ab} - 2 b k_{(a} l_{b)}$ where $\eta$ is flat and $k_a, l_a$ are two null covectors such that $k_a l^a= -1$; next we show how the symmetries of $g$ are connected to those of $\eta$, more precisely; we show that if the original metric $g$ admits a Conformal Killing vector (including Killing vectors and homotheties), then the deformation may be carried out in a way such that the flat deformed metric $\eta$ `inherits' that symmetry.
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