Benjamin, Lichtenberg, la joroba y los añicos

En relación con las referencias de Benjamin a G. C. Lichtenberg, este artículo se centra en la figura del hombrecito jorobado de la canción infantil alemana, que es particularmente relevante para Benjamin en la medida en que personifica el motivo de la Entstellung ('distorsión'). Este motivo es tratado sobre la base de los comentarios de Benjamin a la obra de Franz Kafka. Se concluye con una consideración que relaciona lo anterior con el enano teológico, la llegada del Mesías y el sentido de la redención en el texto titulado Sobre el concepto de historia.En relació amb les referències de Benjamin a G. C. Lichtenberg, aquest article se centra en la figura de l'homenet geperut de la cançó infantil alemanya, que és particularment rellevant per a Benjamin en tant que personifica el motiu de l'Entstellung ('distorsió'). Aquest motiu és tractat sobre la base dels comentaris de Benjamin a l'obra de Franz Kafka. Es conclou amb una consideració que relaciona l'anterior amb el nan teològic, l'arribada del Messies i el sentit de la redempció en el text titulat Sobre el concepte d'història.In connection with Benjamin's references to G. C. Lichtenberg, this paper focuses on the figure of the little hunchback of the German children's song, which is particularly relevant for Benjamin, inasmuch as it personifies the motif of Entstellung (distortion). This motif is further questioned on the basis of Benjamin's commentaries on Kafka, concluding with a consideration that relates the former to the theological dwarf, the coming of the Messiah, and the meaning of redemption in Benjamin's On the Concept of History

Caledonian and late Caledonian Europe: a working hypothesis involving two contrasted compressional/extensional scenarios

The tectonomagmatic and metamorphic structuration of the European Caledonian realm suggests that two mutually perpendicular compressional/extensional scenarios developed during the Ordovician-Devonian time-span. As a result of the mid Ordovician Grampian compressional scheme (Caledonian s.s.), a major extensional province developed further east from the Caledonian foldbelt in continental Europe. This scenario ended by early/mid Devonian, with the complete locking of North America, Baltica and Gondwana into a Pangaea supercontinent, thus triggering a contrasted tectonic environment which might be termedLa estructuración tectonomagmática y metamórfica del dominio caledónico europeo sugiere que dos escenarios, compresional y extensional, mutuamente perpendiculares, se desarrollaron durante el Ordovícico-Devónico. Como resultado del esquema compresional del Ordovícico medio (Grampian, caledónico s.s.), en el O de Europa continental se desarrolló una provincia extensional localizada al E de la faja de plegamiento caledónica. Esta situación finalizó hacia el Devónico inferior/medio, cuando la convergencia de América del Norte, Báltica y Gondwana dió origen al supercontinente Pangea. Esta colisión generó un ambiente tectónico caracterizado por: 1. plegamiento y plutonismo en Europa continental occidental, y 2. extensión y volcanismo en la parte N de la faja de plegamiento caledónica (Escocia, SO de Noruega y E de Groenlandia). Este evento puede ser tentativamente denominado «Tardicaledónico». En términos globales, la evolución del dominio caledónico puede ser explicada en términos de «tectónica de inversión» (s.l.), esto es, períodos de adelgazamiento cortical (extensionales) seguidos por períodos de engrosamiento cortical (compresionales) y vicevers

Suceso y teleología. Un indicio sobre la "lectura" de Kant en Kleist

Se aborda la llamada Kantkrise de Heinrich von Kleist, entendida como el colapso epistemológico de toda posibilidad de acceso a la cosa en sí debido a su carácter radicalmente indecidible. Sin embargo, tal imposibilidad sigue conservando una vigencia negativa, como una brecha que adquiere para Kleist el carácter del suceso y, por consiguiente, de la soberanía de la contingencia. Esta se convierte en el principio fundamental de la producción literaria (dramatúrgica, narrativa y ensayística) de Kleist, reconocible en el lema “el frágil ordenamiento del mundo”, en la frágil constitución del sujeto y la inminencia constante de su destitución

Cassigoli, Rossana. (2016). El exilio como síntoma. Literatura y fuentes. México D. F. / Santiago: UNAM, Metales Pesados. 168 pp.

El exilio como síntoma es un libro complejo. Lo es por su tema, lo es por el tratamiento del tema, cuidadoso, lúcido, “desde dentro”, por la mucha literatura, las muchas fuentes con las que —rigurosamente— se va tramando (Literatura y fuentes es el subtítulo), por su escritura plural, autobiográfica y heterográfica a la vez, de ensayo y testimonio, de comentario y —casi me atrevería a decir— de responso, el responso de un duelo resistente..

Earth Science Data Fusion with Event Building Approach

Objectives of the NASA Information And Data System (NAIADS) project are to develop a prototype of a conceptually new middleware framework to modernize and significantly improve efficiency of the Earth Science data fusion, big data processing and analytics. The key components of the NAIADS include: Service Oriented Architecture (SOA) multi-lingual framework, multi-sensor coincident data Predictor, fast into-memory data Staging, multi-sensor data-Event Builder, complete data-Event streaming (a work flow with minimized IO), on-line data processing control and analytics services. The NAIADS project is leveraging CLARA framework, developed in Jefferson Lab, and integrated with the ZeroMQ messaging library. The science services are prototyped and incorporated into the system. Merging the SCIAMACHY Level-1 observations and MODIS/Terra Level-2 (Clouds and Aerosols) data products, and ECMWF re- analysis will be used for NAIADS demonstration and performance tests in compute Cloud and Cluster environments

Geoquímica de los procesos de alteración hidrotermal en la mineralización de Sb de Mari Rosa (zona Centro Ibérica)

The Central Iberian Zone of the Hesperian Massif hosts a series of late Hercynian veintype Sb deposits. One of them is the Mari Rosa mineralization, hosted by metagreywackes and slates belonging to the so-called Schist-Greywacke Complex (Upper Precambrian). The mineralization is characterized by a complex paragenesis comprising arsenopyrite-(pyrite), stibnite-gold and pyrite-pyrrhotite-galena-sphalerite-chalcopyrite-tetrahedrite-boulangeritestibnite. Of these only the second episode was of importance and gave rise to the main mineralized bodies of the deposito Two types of veins can be defined in Mari Rosa: Vp, showing pinch and swell structures parallel to the main foliation planes (S2), and Vo, massive lensoid-shaped bodies of gold bearing stibnite postdating the Vp veins and cross-cutting S2. Hydrothermal alteration consists oí a mild sericitization, chloritization and carbonatization oí the metasedimentary rocks around the veins. Due to the mineralogy oí the hostrocks (muscovite, chlorite, quartz), these alteration facies are not easily recognizable. However, the study of chemical changes around the veins allow a clear characterization of the hydrotermal processes. !hus, a remarkable increase in the ratio K2O/Na2O (from 1.2 in the regional rocks to 5.1 lfi the Vp contact rocks) and a decrease in the ratio SiO2/volatiles (írom 27.4 in the regional rocks to 13.5 in the Vp contact rocks) can be used as clear-cut indicators of the extension and magnitude of the hydrothermal alteration. Other changes included increases lfi. Sb (between 5,000 and 10,000 times the regional background), Mo (up to 60 times the regional background) and Au (values oí up to 32 ppm) around the veins. Besides, a high positive correlation between Sb and Mo is observed (R = 1 in the veins and R = 0.9 in the host rocks). The isotopic signature of stibnite and pyrite (average δ34S of 0.3‰ and -3.9‰, respectively) is close to the typical values of magmatic sulphur. This, together with the high correlations between Sb and Mo strongly suggest a genetic relationship between the Mari Rosa mineralization and the intrusion of the Alburquerque batholith.La zona Centro Ibérica del Macizo Hespérico contiene una serie de depósitos filonianos de antimonio de edad tardihercínica. Uno de ellos es la mineralización de Mari Rosa, encajada en metagrauvacas y pizarras pertenecientes al Complejo Esquisto Grauváquico (Precámbrico Superior) y situada en las proximidades del batolito de Alburquerque (Westfaliense/ Estefaniense). La mineralización está caracterizada por una paragénesis compleja que incluye arsenopirita-(pirita), estibina-oro y pirita-pirrotina-galena-esfalerita-calcopirita-tetraedrita- boulangerita-estibina. De éstos, sólo el segundo episodio fue importante y dio lugar a los principales cuerpos mineralizados del depósito. Dos tipos de venas pueden definirse en Mari Rosa: Vp, mostrando estructuras abudinadas paralelas a la esquistosidad principal (S2/), y Yo, bolsadas lenticulares de estibina masiva aurífera posteriores a Vp y cortando a S2/. La alteración hidrotermal consiste en una débil sericitización, cloritización y carbonatización de las rocas metasedimentarias en torno a las venas. Debido a la mineralogía de estas rocas (moscovita, clorita, cuarzo), estas facies de alteración no se reconocen fácilmente. Sin embargo, el estudio de los cambios químicos alrededor de las venas permite una caracterización adecuada de los procesos hidrotermales. Así, un notable incremento en la razón K2O/Na2O (desde 1,2 en las rocas regionales a 5,1 en la proximidad de las venas Vp) y un descenso en SiO2/volátiles (desde 27,4 en las rocas regionales a 13,5 en la proximidad de las venas Vp) pueden ser utilizados como marcadores de la magnitud y extensión de la alteración hidrotermal. Otros cambios incluyen importantes incrementos en Sb (valores entre 5.000 y 10.000 veces la media regional), Mo (hasta 60 veces su concentración regional) y Au (con valores máximos de hasta 32 ppm) en torno a las venas. Por otra parte, se observa una elevada correlación positiva entre Sb y Mo (R = 1 en las venas mineralizadas, R = 0,9 en las rocas encajantes). La composición isotópica media de estibina y pirita δ34S = 0,3 ‰ y-3,9 ‰, respectivamente) presenta valores próximos a los de azufre de origen magmático. Esto, junto con las significativas correlaciones entre Sb y Mo permiten sugerir una relación genética entre la mineralización de Mari Rosa y la intrusión del batolito de Alburquerque

Geochemistry of the Quaternary alkali basalts of Garrotxa (NE Volcanic Province, Spain): a case of double enrichment of the mantle lithosphere

The area of Garrotxa (also known as the Olot area) represents the most recent (700,000–11,500 y) and better preserved area of magmatic activity in the NE Volcanic Province of Spain (NEVP). This region comprises a suite of intracontinental leucite basanites, nepheline basanites and alkali olivine basalts, which in most cases represent primary or nearly primary liquids. The geochemical characteristics of these lavas are very similar to the analogous petrologic types of other Cenozoic volcanics of Europe, which are intermediate between HIMU, DM and EM1. Quantitative trace element modeling, suggests derivation from an enriched mantle source by degrees of melting that progressively increased from the leucite basanites (,4%) to the olivine basalts (,16%). However, the relatively more variable Sr–Nd–Pb isotope signature of the magmas suggests the participation of at least two distinct components in the mantle source: (1) a sublithospheric one with a geochemical signature similar to the magmas of Calatrava (Central Spain) and other basalts of Europe; and (2) an enriched lithospheric component with a K-bearing phase present. The geochemical model proposed here involves the generation of a hybrid mantle lithosphere source produced by the infiltration of the sublithospheric liquids into enriched domains of the mantle lithosphere, shortly before the melting event that generated the Garrotxa lavas. The available geological data suggest that the first enrichment event of the mantle lithosphere under the NEVP could be the result of Late Variscan mantle upwelling triggered by the extensional collapse of the Variscan orogen during the Permo-Carboniferous. By Jurassic/Cretaceous time, large-scale NNE-directed sublithospheric mantle channeling of thermally and chemically anomalous plume material was placed under the Iberian Peninsula and Central Europe. However, the geodynamic conditions in the NEVP did not favor magmatism, which could not take place until the Cenozoic after extension started. This favored the second enrichment event of the mantle lithosphere by entrainment and storage of liquids generated in the sublithospheric plume material. After a relatively short period of time, as extension progressed, it triggered melting in the enriched portions of the mantle lithosphere during the Quaternary, generating the Garrotxa volcanism.Depto. de Mineralogía y PetrologíaFac. de Ciencias GeológicasTRUEpu

Heterogeneous CPU/GPU co-execution of CFD simulations on the POWER9 architecture: Application to airplane aerodynamics

High fidelity Computational Fluid Dynamics simulations are generally associated with large computing requirements, which are progressively acute with each new generation of supercomputers. However, significant research efforts are required to unlock the computing power of leading-edge systems, currently referred to as pre-Exascale systems, based on increasingly complex architectures. In this paper, we present the approach implemented in the computational mechanics code Alya. We describe in detail the parallelization strategy implemented to fully exploit the different levels of parallelism, together with a novel co-execution method for the efficient utilization of heterogeneous CPU/GPU architectures. The latter is based on a multi-code co-execution approach with a dynamic load balancing mechanism. The assessment of the performance of all the proposed strategies has been carried out for airplane simulations on the POWER9 architecture accelerated with NVIDIA Volta V100 GPUs

A MegaCam Survey of Outer Halo Satellites. I. Description of the Survey

We describe a deep, systematic imaging study of satellites in the outer halo of the Milky Way. Our sample consists of 58 stellar overdensities --- i.e., substructures classified as either globular clusters, classical dwarf galaxies, or ultra-faint dwarf galaxies --- that are located at Galactocentric distances of R$_{\rm GC}$ > 25 kpc (outer halo) and out to ~400 kpc. This includes 44 objects for which we have acquired deep, wide-field, $g-$ and $r-$band imaging with the MegaCam mosaic cameras on the 3.6m Canada-France-Hawaii Telescope and the 6.5m Magellan-Clay telescope. These data are supplemented by archival imaging, or published $gr$ photometry, for an additional 14 objects, most of which were discovered recently in the Dark Energy Survey (DES). We describe the scientific motivation for our survey, including sample selection, observing strategy, data reduction pipeline, calibration procedures, and the depth and precision of the photometry. The typical 5$\sigma$ point-source limiting magnitudes for our MegaCam imaging --- which collectively covers an area of ~52 deg$^{2}$ --- are $g_{\rm lim}$ ~25.6 and $r_{\rm lim}$ ~25.3 AB mag. These limits are comparable to those from the coadded DES images and are roughly a half-magnitude deeper than will be reached in a single visit with LSST. Our photometric catalog thus provides the deepest and most uniform photometric database of Milky Way satellites available for the foreseeable future. In other papers in this series, we have used these data to explore the blue straggler populations in these objects, their density distributions, star formation histories, scaling relations and possible foreground structures.Comment: Accepted for publication in Ap

Implementation of the COIL methodology, as a strategy to enhance the teaching-learning process and academic and student mobility in the virtual mode

Hoy en día, el uso de las TIC ha generado un cambio en el ámbito educativo, generando cambios estructurales y operativos en la forma de enseñar, comunicares y aprender. Ante la crisis actual derivada de la pandemia por el COVID-19, las Instituciones de Educación Superior en México y en el mundo, han tenido que generar estrategias para que los estudiantes cuenten con diferentes opciones de enseñanza y de acompañamiento en formatos digitales y puedan continuar con sus estudios, sin descuidar el nivel académico; así mismo durante este periodo se cancelaron y/o suspendieron temporalmente los programas de movilidad educativa presencial, perdiendo todos los beneficios académicos e interculturales que se generan. Actualmente, existen una gran cantidad de herramientas digitales para la gestión de contenidos, plataformas de enseñanza-aprendizaje, redes sociales, herramientas de comunicación y de acceso a la información, que de manera accesible permite la posibilidad de realizar actividades atractivas para el alumnado. Esto ha favorecido la implementación de metodologías activas de enseñanza-aprendizaje como la “Clases Espejo”, basada en la metodología COIL (Collaborative Online International Learning), que se conceptualiza como aulas compartidas, a través de herramientas tecnológicas para la impartición de un curso, que permiten interactuar a docentes y alumnos de diferentes escuelas o instituciones.Today, the use of ICT has generated a change in the educational field, generating structural and operational changes in the way of teaching, communicating and learning. Faced with the current crisis derived from the COVID-19 pandemic, Higher Education Institutions in Mexico and in the world have had to generate strategies so that students have different teaching and support options in digital formats and can continue with their studies, without neglecting the academic level; Likewise, during this period, face-to-face educational mobility programs were canceled and/or temporarily suspended, losing all the academic and intercultural benefits generated. Currently, there are a large number of digital tools for content management, teaching-learning platforms, social networks, communication tools and access to information, which in an accessible way allow the possibility of carrying out attractive activities for students. This has favored the implementation of active teaching-learning methodologies such as the "Mirror Classes", based on the COIL (Collaborative Online International Learning) methodology, which is conceptualized as shared classrooms, through technological tools for teaching a course, that allow teachers and students from different schools or institutions to interact