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Sample records for cerro bola provincia

  1. Andesita Cerro Bola: Nueva unidad vinculada al magmatismo mioceno de la Cordillera de Olivares, San Juan, Argentina (30°35´S; 69°30´O Cerro Bola Andesite: New unit linked to the Miocene magmatism of the Olivares Cordillera, San Juan (30°35' S ; 68°30' W

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    A.F. Wetten

    2005-03-01

    Full Text Available El área de estudio se halla en la zona de Tocota, inmediatamente al este de la Cordillera de Olivares, en el borde oriental de la Cordillera Frontal, provincia de San Juan. En ella se encuentran unidades ígneas y sedimentarias del ciclo gondwánico, las que fueron intruidas y cubiertas en relación discordante por cuerpos subvolcánicos y volcánicos asignados anteriormente al ciclo ándico en sentido amplio, los cuales constituyen el principal objeto del presente estudio. Estos cuerpos han sido mapeados a fin de poder caracterizarlos adecuadamente, en el contexto estratigráfico de la región. Los afloramientos de interés han sido reconocidos en el cerro Bola y alrededores, donde se observan distribuidos irregularmente, cubriendo un área superior a 5 km². Las rocas, de coloración gris clara y composición andesítica - fenoandesítica, presentan estructuras de domo y colada. Estos afloramientos serían correlacionables con la unidad volcánica Pircas (Mioceno, la que aflora al oeste, y conformarían un evento magmático posterior al de pórfidos de diferente composición situados tanto en el arroyo Chita como en el cerro Divisadero. La extensión del área involucrada, la uniformidad litológica, el bajo grado de alteración y una edad radimétrica obtenida por el método K/Ar, fueron considerados para proponer a estas volcanitas como una unidad litoestratigráfica de edad miocena superior, con la denominación de Andesita Cerro Bola.The study area is located in the region of Tocota Creek, close to the Cordillera Olivares, eastern border of the Frontal Range, San Juan province. In this place, igneous and sedimentary units belonging to the Gondwanic cycle, were recognized. These units were intruded and unconformably covered by subvolcanic and volcanic bodies, which were commonly referred to the Tertiary or Andean cycle. The study of these bodies is the main proposal of this work. These bodies had been mapped in order to characterize them

  2. Los marsupiales (Mammalia del Mioceno Superior de la Formación Cerro Azul (Provincia de La Pampa, Argentina

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    Visconti, G.

    2000-04-01

    first lower molar. Microtragulus rusconii (Argirolagida, Argirolagidae is generalized with respect to the other species of this genus in having a less reduced talonid in the m4, and shows closer affinities with M. catamarcensis than with M. reigi. Hyperdidelphys, Lutreolina, Thylatheridium, Achlysictis, and, probably Microtragulus, are common taxa with those of the Valle de Santa María and Puerta de Corral Quemado, in Catamarca province (northwestern Argentina. On the contrary, Pliolestes and Zygolestes constitute exclusive taxa of Cerro Azul Fm. for central Argentina during the Huayquerian Age. The marsupial association recovered from levels of Cerro Azul Fm. is the most abundantly recorded from Upper Miocene levels in South America. Its taxonomic composition confirms previous hypotheses on the important faunal turnover that happened in this continent, as a consequence of the environmental changes occurred since the medial Miocene.Se describe la asociación de marsupiales sudamericanos fósiles de edad Huayqueriense (Mioceno tardío más completa hasta ahora conocida. Los ejemplares fueron exhumados de varias localidades fosilíferas nuevas del centro y norte de la provincia de La Pampa (Argentina central, en sedimentos asignables a la Formación Cerro Azul: Bajo Giuliani, Quehué, Telén, El Guanaco y Laguna Chillhué. El conjunto de las sedimentitas loessoides analizadas en los diferentes afloramientos de esta formación indica la existencia de depósitos lacustres en la base, a los que suprayacen niveles eólicos, ambos con evidencias pedogenéticas. El análisis de estas sedimentitas en cada una de las localidades estudiadas, permitió correlacionarlas en un perfil integrado de la Formación Cerro Azul. Esta formación es correlacionable con la «Formación Epecuén», al menos en la localidad Salinas Grandes de Hidalgo y, probablemente, con los términos superiores de la Formación Arroyo Chasicó. Los marsupiales fósiles exhumados representan la casi

  3. NUEVOS APORTES AL CONOCIMIENTO DE LA HERPETOFAUNA DE LA FORMACIÓN CERRO AZUL (MIOCENO SUPERIOR, PROVINCIA DE LA PAMPA, ARGENTINA

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    AGUSTÍN SCANFERLA

    2015-01-01

    Full Text Available RESUMENSe describen nuevos materiales fósiles de anfibios y reptiles hallados en sedimentos referidos a la Formación Cerro Azul (Mioceno Superior, procedentes de numerosas localidades de la provincia de La Pampa, Argentina. Los nuevos registros se basan en un resto craneano de anuro asignado al géneroCeratophrys, restos de caparazón de tortugas terrestres del géneroChelonoidis, vértebras asignables al lagarto de la familia TeiidaeTupinambis, y una vértebra troncal de serpiente comparable al género de colubroideos actualesPhilodryas. Tanto los registros terciarios previos de géneros actuales de anfibios y reptiles en América del Sur, como así también la asociación recuperada en el Mioceno Superior de La Pampa sugieren que la mayoría de los géneros que componen la herpetofauna Neotropical estaban presentes en el Mioceno, patrón similar al observado en otras regiones del mundo.

  4. Los granitos peraluminosos de las Sierras de Vinquis, Cerro Negro y Zapata (Sierras Pampeanas, provincia de Catamarca, Argentina

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    Medina, M. E.

    1992-12-01

    Full Text Available The studied plutons are close to several batholiths of this region, as Sierra de Mazán and other, but with some mineralogical peculiarities. The magmatic cordierite, common in proximate places, is scarce, as sillimanite, while the andalusite is very rare, with few tourmaline. Fluorite and allanite are also typical accasories only in the granites of the Sierra de Zapata. All plutons are peraluminous of potassic tendency, with cortical affinity.The interpretation of the geochemical values distinguishes between granites of different maturity, emplaced under a predominant influence of active margin for Cerro Negro and Vinquis, while the batholith of Zapata has, below these concepts, a marked feature of within plate.The mineralogical associations suggest that the granites of Cerro Negro and Vinquis were emplaced to pressures of 2 kb or less and temperature of 650º C, while the granites of Zapata had done under conditions of lesser pressure, between 1.5 and 2.0 kb and lower temperature, 600-650º C.A grandes rasgos, los plutones estudiados tienen semejanzas con otros del entorno regional, tal como los de la Sierra de Mazán, pero con peculiaridades mineralógicas. La cordierita magmática, que en lugares próximos es muy abundante, es aquí escasa, al igual que la sillimanita, mientras que la andalucita es muy rara y la turmalina poco frecuente. La fluorita y allanita son accesorios comunes y de cierta abundancia sólo en los granitos de la Sierra de Zapata.Todos los plutones son peralumínicos y de tendencia potásica, con neta afinidad cortical. El estudio estadístico de datos geoquímicos seleccionados, permite diferenciar agrupaciones que tienen un reflejo satisfactorio en los plutones caracterizados, por encima de las variaciones de facies. La interpretación de los valores geoquímicos distingue granitos de desigual madurez, emplazados bajo una influencia predominante de margen activo o intraplaca de características continentales, en

  5. Constraining the Paleogene of South America: Magnetostratigraphy and paleoclimate proxy records from Cerro Bayo (Provincia de Salta, Argentina)

    Science.gov (United States)

    Hyland, E.; Cotton, J. M.; Sheldon, N. D.

    2012-12-01

    Records of rapid climatic and ecological shifts in the past are crucial for understanding global systems and for predicting future impacts of climate change. Transient and broad scale hyperthermal events during the Paleogene, such as the Paleocene-Eocene Thermal Maximum (PETM) and Early Eocene Climatic Optimum (EECO), have been studied extensively through both marine records and a significant terrestrial record from North America. Despite this, little evidence exists from the climatic and ecological histories of other major landmasses, which limits the effectiveness of global climate response predictions. Here we present an integrated paleoenvironmental reconstruction of the early Paleogene from a site in central South America (Cerro Bayo, Argentina), including a new magnetostratigraphic age model, pedological and sedimentological interpretation, whole rock geochemical climate proxies, isotopic environmental proxies, and microfloral assemblages. Cerro Bayo is a 235-meter terrestrial section that exposes the Tunal, Mealla, and Maiz Gordo Formations, and based on magnetostratigraphic interpolation spans roughly 58—50 Mya, including both the PETM and EECO events. These formations are composed primarily of reddish sandstone and siltstone, much of which exhibits features characteristic of a moderate degree of pedogenesis (i.e., Inceptisols and Alfisols). High-resolution climate proxies derived from paleosol geochemical compositions highlight rapid increases in mean annual temperature (>5°C) and precipitation (>300 mm yr-1) during the PETM, as well as more gradual increasing temperature and precipitation trends leading up to the EECO. Carbon isotope stratigraphy through the section also indicates a sizable negative excursion (~4‰) during the PETM, and generally positive isotopic trends during the early Eocene. Phytolith biostratigraphy also details changes in local vegetation composition during climatic events that corresponds to similar patterns seen in terrestrial

  6. Microestructuras de deformación en rocas granulíticas, Cerro La Crespa, Tandilia, Provincia de Buenos Aires

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    Lucrecia Jorgensen

    2008-06-01

    Full Text Available El cerro La Crespa, localizado un kilómetro al sur de la megacizalla de Azul, integra las sierras de Azul, las cuales componen parte del Sistema de Tandilia. El presente trabajo trata sobre el estudio petrográfico-microestructural, donde se determina la composición modal y arreglos texturales a escala de grano y una primera caracterización geoquímica de rocas granulíticas aflorantes en el sector NO del cerro La Crespa. A partir de tales análisis, se intenta dilucidar los mecanismos de deformación actuantes y las condiciones metamórficas alcanzadas. Se reconocen rocas con texturas granoblásticas de composición básica e intermedia. Dichas rocas evidencian deformación frágil-dúctil heterogénea, con desarrollo de fábricas miloníticas, acaecida luego de que el evento metamórfico alcanzara su máximo desarrollo. Las texturas primitivas y la asociación de minerales anhidros presentes indicarían que dichas rocas podrían ser consideradas dentro de la serie de las granulitas. En las milonitas se aprecian significativos cambios mineralógicos, ya que al aumentar la deformación se incrementa la proporción de minerales hidratados y simultáneamente se reduce la cantidad de minerales anhidros. Estas modificaciones hacen suponer que la deformación actuó bajo condiciones metamórficas medias a altas, en facies de anfibolita superior-granulita inferior. Esta interpretación está apoyada por los mecanismos de deformación observados, a saber, recristalización dinámica de feldespatos, piroxenos, anfíboles, biotita y cuarzo; elongación de piroxenos y desarrollo de microboudinage.

  7. Microestructuras de deformación en rocas granulíticas, Cerro La Crespa, Tandilia, Provincia de Buenos Aires Deformation microstructures in granulitic rocks, Cerro La Crespa, Tandilia, province of Buenos Aires

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    Lucrecia Jorgensen

    2008-06-01

    Full Text Available El cerro La Crespa, localizado un kilómetro al sur de la megacizalla de Azul, integra las sierras de Azul, las cuales componen parte del Sistema de Tandilia. El presente trabajo trata sobre el estudio petrográfico-microestructural, donde se determina la composición modal y arreglos texturales a escala de grano y una primera caracterización geoquímica de rocas granulíticas aflorantes en el sector NO del cerro La Crespa. A partir de tales análisis, se intenta dilucidar los mecanismos de deformación actuantes y las condiciones metamórficas alcanzadas. Se reconocen rocas con texturas granoblásticas de composición básica e intermedia. Dichas rocas evidencian deformación frágil-dúctil heterogénea, con desarrollo de fábricas miloníticas, acaecida luego de que el evento metamórfico alcanzara su máximo desarrollo. Las texturas primitivas y la asociación de minerales anhidros presentes indicarían que dichas rocas podrían ser consideradas dentro de la serie de las granulitas. En las milonitas se aprecian significativos cambios mineralógicos, ya que al aumentar la deformación se incrementa la proporción de minerales hidratados y simultáneamente se reduce la cantidad de minerales anhidros. Estas modificaciones hacen suponer que la deformación actuó bajo condiciones metamórficas medias a altas, en facies de anfibolita superior-granulita inferior. Esta interpretación está apoyada por los mecanismos de deformación observados, a saber, recristalización dinámica de feldespatos, piroxenos, anfíboles, biotita y cuarzo; elongación de piroxenos y desarrollo de microboudinage.This work deals with a petrographic- microstructural study in order to determine the modal composition and textural arrangement on a grain scale and the first geochemistry characterization of granulitic rocks on the NW of the cerro La Crespa, which is located about 1 km south of the Azul Megashear and forms part of the sierras de Azul in the Tandilia System

  8. El volcanismo bimodal del volcán cerro Corona, Alta Sierra de Somún Curá, provincia de Río Negro

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    Guadalupe Maro

    2012-03-01

    Full Text Available La Alta Sierra de Somún Curá es uno de los complejos volcánicos terciarios postplateau en el ambiente de la meseta basáltica de Somún Curá, en la Patagonia extrandina. En ella se encuentra el cerro Corona, un volcán en escudo que corresponde al centro de mayor altura en la región. Está construido por rocas efusivas y piroclásticas subordinadas, fundamentalmente traquiandesíticas-basálticas, con variaciones traquíticas tanto en sus flancos como en su cráter. A pesar de la bimodalidad compositional con una importante discontinuidad entre el 54 y 58 % en peso de SiO2, el presente trabajo propone que las traquitas son el producto de la evolución por cristalización fraccionada de las traquiandesitas basálticas, con cierta influencia de recargas máficas a la cámara magmática de acuerdo a la presencia de texturas de desequilibrio en los fenocristales, principalmente de las rocas félsicas.

  9. Los depósitos de bentonita de Barda Negra y cerro Bandera, departamento Zapala, provincia del Neuquén, Argentina Bentonite deposits of Barda Negra and Cerro Bandera, Zapala Department, Neuquén Province, Argentina

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    A. Impiccini

    2002-09-01

    Full Text Available Las bentonitas de la región nordpatagónica pueden ser agrupadas en dos distritos mineralogenéticos caracterizados desde el punto de vista geológico, geográfico y estratigráfico. En este trabajo se considera a las bentonitas terciarias localizadas en la región occidental, en el departamento Zapala, provincia del Neuquén. Los depósitos consisten en estratos lenticulares, subhorizontales, de 2 a 15 metros de espesor, la mayoría de ellos aflorantes. Están incluidos en la Formación Collón Curá, una secuencia miocena continental donde alternan tobas y areniscas. Los cuerpos de arcilla son productos de alteración de materiales piroclásticos vítreos en ambientes húmedos confinados, tales como cuerpos de agua someros. Los análisis por difracción de rayos X muestran que prevalece una esmectita dioctaédrica - montmorillonita - como único mineral arcilloso en la mayoría de los depósitos. Los minerales accesorios son cuarzo, feldespato, plagioclasa y cristobalita (ópalo-CT, y en menor proporción, ceolitas y yeso. El Na+ es el ión intercambiable dominante, junto con Ca++, Mg++ y K+. El contenido en Fe2O3 es muy alto. Estas bentonitas son buenos agentes ligantes en arenas de moldeo para fundición, pero sus propiedades reológicas y el test de filtrado no cumplen exactamente con las normas API para lodos de perforación de petróleo.Bentonites from the North Patagonia region can be grouped in two mineralogenic districts distinguishable on geological, geographical, and stratigraphical criteria. In this paper, we consider the Tertiary bentonites located in the western region, Zapala Department, Neuquén Province. The deposits occur in sub-horizontal lenticular beds, 2 to 15 m in thickness, most of which crop out at the surface. They lie within the Collón Curá Formation, a Miocene continental sequence of alternating tuffs and sandstones. The clay bodies are alteration products of pyroclastic glassy materials in confined wet

  10. Los depósitos de bentonita de Barda Negra y cerro Bandera, departamento Zapala, provincia del Neuquén, Argentina

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    A. Impiccini

    2002-09-01

    Full Text Available Las bentonitas de la región nordpatagónica pueden ser agrupadas en dos distritos mineralogenéticos caracterizados desde el punto de vista geológico, geográfico y estratigráfico. En este trabajo se considera a las bentonitas terciarias localizadas en la región occidental, en el departamento Zapala, provincia del Neuquén. Los depósitos consisten en estratos lenticulares, subhorizontales, de 2 a 15 metros de espesor, la mayoría de ellos aflorantes. Están incluidos en la Formación Collón Curá, una secuencia miocena continental donde alternan tobas y areniscas. Los cuerpos de arcilla son productos de alteración de materiales piroclásticos vítreos en ambientes húmedos confinados, tales como cuerpos de agua someros. Los análisis por difracción de rayos X muestran que prevalece una esmectita dioctaédrica - montmorillonita - como único mineral arcilloso en la mayoría de los depósitos. Los minerales accesorios son cuarzo, feldespato, plagioclasa y cristobalita (ópalo-CT, y en menor proporción, ceolitas y yeso. El Na+ es el ión intercambiable dominante, junto con Ca++, Mg++ y K+. El contenido en Fe2O3 es muy alto. Estas bentonitas son buenos agentes ligantes en arenas de moldeo para fundición, pero sus propiedades reológicas y el test de filtrado no cumplen exactamente con las normas API para lodos de perforación de petróleo.

  11. Jurassic tetrapods and flora of Cañadón Asfalto Formation in Cerro Cóndor area, Chubut Province Flora y tetrápodos del Jurásico de la Formación Cañadón Asfalto en el área de Cerro Cóndor, provincia de Chubut

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    Ignacio H. Escapa

    2008-12-01

    Full Text Available The plant and tetrapod fossil record of the Cañadón Asfalto Formation (Middle to Late Jurassic found in Cerro Cóndor area (Chubut Province is summarized here. The flora is dominated by conifers (Araucariaceae, Cupressaceae sensu lato but also includes ferns and equisetaleans. The tetrapod fauna is composed of dinosaur taxa described in the 70's as well as other remains recently described and other vertebrate groups such as amphibians, turtles, and mammals. The amphibian remains have been interpreted as representatives of a new species of Notobatrachus, considered one of the most basal members of the anuran lineage. Similarly, turtle remains have been recently recognized as a new species of basal turtle, bringing valuable information about the early evolution of this group. The dinosaur remains are largely dominated by saurischian taxa, represented by basal forms of Eusauropoda and Tetanurae. In addition, three different mammalian species have been identified and considered as early representatives of an endemic Gondwanan mammalian fauna. The fossil record of this formation represents the most completely known biota from the continental Middle to Late Jurassic of the Southern Hemisphere and one of the most complete of the entire world.Se resume brevemente el registro de plantas y tetrápodos fósiles de la Formación Cañadón Asfalto (Jurásico Medio a Superior en el área de Cerro Cóndor, provincia de Chubut. La flora está conformada por coníferas de las familias Araucariaceae y Cupressaceae sensu lato dominando la asociación, la cual se completa con helechos y equisetales en proporciones menores. La fauna de tetrápodos se compone por los clásicos dinosaurios descriptos en los 70`s, a los que se suman nuevos restos pertenecientes a este grupo, así como anfibios, tortugas y mamíferos coleccionados en la última década. Los restos de anfibios han sido interpretados como representantes de una nueva especie de Notobatrachus, considerado

  12. Jurassic tetrapods and flora of Cañadón Asfalto Formation in Cerro Cóndor area, Chubut Province Flora y tetrápodos del Jurásico de la Formación Cañadón Asfalto en el área de Cerro Cóndor, provincia de Chubut

    OpenAIRE

    2008-01-01

    The plant and tetrapod fossil record of the Cañadón Asfalto Formation (Middle to Late Jurassic) found in Cerro Cóndor area (Chubut Province) is summarized here. The flora is dominated by conifers (Araucariaceae, Cupressaceae sensu lato) but also includes ferns and equisetaleans. The tetrapod fauna is composed of dinosaur taxa described in the 70's as well as other remains recently described and other vertebrate groups such as amphibians, turtles, and mammals. The amphibian remains have been i...

  13. Al Este del Cerro Pampa: ampliación del área de disponibilidad de obsidiana de la Pampa del Asador (Provincia de Santa Cruz East of the Cerro Pampa: enlargement of the obsidian availability area from Pampa del Asador (Santa Cruz Province

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    Juan Bautista Belardi

    2006-12-01

    Full Text Available La Pampa del Asador ha sido identificada como el lugar de proveniencia de distintos tipos de obsidiana, mayoritariamente negra, y el Cerro Pampa, ubicado en el extremo suroeste de la pampa, ha sido un punto central a partir del cual se ha medido la dispersión de los artefactos confeccionados en esta materia prima. Sobre la base de la interpretación de imágenes satelitales, análisis químicos y trabajos de campo se presenta y discute la evidencia provista por nódulos y artefactos de obsidiana recuperados en paleocauces y un abanico aluvial que se origina en la Pampa del Asador. Los resultados muestran la ampliación del área de disponibilidad de obsidiana 65 km hacia el este y 75 km al noreste del Cerro Pampa y, aunque presentando menor frecuencia relativa de nódulos y el decrecimiento de sus tamaños, el área se amplía a lo largo de la Pampa La Chispa. Estos resultados tienen implicaciones tanto en términos de la distribución de frecuencias de artefactos de obsidiana en el registro arqueológico regional como en los costos de aprovisionamiento de la roca.Pampa del Asador has been identified as the source of distinct types of obsidian (generally black, and Cerro Pampa, located in the extreme southwest of the Pampas, has been the central point from which the dispersal of artifacts fashioned from this obsidian has been measured. Based on the interpretation of satellite images, geochemical analysis, and field work, we present and discuss evidence provided by nodules and artifacts of obsidian recovered from paleo-drainage channels and an alluvial fan which originates in Pampa del Asador. The results expand the area of availability of obsidian 65 km east and 75 km northeast of Cerro Pampa, and also across Pampa La Chispa, although the relative frequency of nodules decreases and smaller size increases. These results have implications both in terms of the distribution and frequency of obsidian artifacts in the regional archaeological record

  14. Demo 105. Bola “alegre” y bola “triste” en colisiones

    OpenAIRE

    2014-01-01

    Objetivo: Observar la colisión de dos bolas de materiales diferentes y razonarla en términos del coeficiente de restitución. Discutir el diferente de comportamiento de ambas bolas en términos de este coeficiente y los diferentes tipos de energía involucrados.

  15. El volcanismo bimodal del volcán cerro Corona, Alta Sierra de Somún Curá, provincia de Río Negro Bimodal volcanism of the Cerro Corona volcano in the Alta Sierra de Somún Curá (Río Negro province

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    Guadalupe Maro

    2012-03-01

    Full Text Available La Alta Sierra de Somún Curá es uno de los complejos volcánicos terciarios postplateau en el ambiente de la meseta basáltica de Somún Curá, en la Patagonia extrandina. En ella se encuentra el cerro Corona, un volcán en escudo que corresponde al centro de mayor altura en la región. Está construido por rocas efusivas y piroclásticas subordinadas, fundamentalmente traquiandesíticas-basálticas, con variaciones traquíticas tanto en sus flancos como en su cráter. A pesar de la bimodalidad compositional con una importante discontinuidad entre el 54 y 58 % en peso de SiO2, el presente trabajo propone que las traquitas son el producto de la evolución por cristalización fraccionada de las traquiandesitas basálticas, con cierta influencia de recargas máficas a la cámara magmática de acuerdo a la presencia de texturas de desequilibrio en los fenocristales, principalmente de las rocas félsicas.The Cerro Corona is a shield volcano situated in the Alta Sierra de Somún Curá, one of the tertiary volcanic complex that constitute the Meseta de Somún Curá, in the Extrandean Patagonia. It is the highest center in the region and it is compound mainly of basaltic trachyandesites, with trachytic variations on its flanks and crater. Despite the compositional bimodality with an important compositional gap between 54% and 58% in weight in SiO2, this work suggests that trachytes are the product of the evolution of basaltic trachyandesites through fractional crystallization, with some influence of mafic recharge to the magmatic chamber, in agreement with the presence of disequilibrium textures in fenocrystals, essentially in felsic rocks.

  16. Estratigrafía, análisis de facies y paleoambientes de la formación cañadón asfalto en el depocentro jurásico cerro Cóndor, provincia del Chubut

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    Nora Cabaleri

    2010-05-01

    Full Text Available El depocentro Cerro Cóndor representa la secuencia estratigráfica del Jurásico continental más completa de la cuenca de Cañadón Asfalto y de Sudamérica austral. Se sitúa en la Patagonia extraandina, en ambas márgenes del río Chubut medio. La sedimentación en esta cuenca pull apart, acompañada por efusiones de basalto olivínico, comenzó en el Jurásico Medio temprano. Predominan en la Formación Cañadón Asfalto los depósitos lacustres caracterizados por asociaciones de facies carbonáticas y siliciclásticas intercaladas con rocas lávicas en la base y depósitos piroclásticos hacia el techo de la unidad. Se describe el desarrollo de facies a lo largo de un corte norte-sur que abarca las secciones de estancia El Torito y de los cañadones Los Loros, Las Chacritas, Carrizal, Asfalto y Lahuincó. Las facies/microfacies carbonáticas están representadas por mudstones, wackestones,packstones, grainstones y calizas microbialíticas características de ambientes litorales, marginales y palustres. En la Formación Cañadón Asfalto se distinguen un miembro inferior (Las Chacritas, constituido por calizas, lutitas, areniscas y conglomerados, intercalados con basaltos olivínicos y por otro superior (Puesto Almada compuesto por tobas, tufitas, lutitas y areniscas. El primero es portador de una asociación palinológica de edad bajociano-bathoniana y el segundo de dinosaurios de edad tithoniana. Se describen detalladamente e ilustran las secciones estratigráficas de ambos miembros de la formación en sus localidades tipo, cañadón Las Chacritas y estancia el Torito y se reconstruyen los paleoambientes del depocentro desde el Aaleniano al Tithoniano. La edad del miembro Puesto Almada en su localidad tipo se obtuvo mediante una datación radimétrica (K/Ar de biotitas provenientes de una delgada capa de toba volcánica (147,1 ± 3,3 Ma, Tithoniano proveniente de la parte superior de la unidad.

  17. Caracterización petrográfica y geoquímica del batolito Cerro Aspero-Alpa Corral (32°34'-32°42' LS y 64°43'-64°52' LO, provincia de Córdoba, Argentina

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    Porta, G.

    1992-12-01

    Full Text Available The Cerro Aspero-Alpa Corral (CA-AC batholith is a 440 km2 granite body present in the Southern edge of the Eastern Pampean Ranges, Córdoba province, central Argentina. The intrusive body of probably paleozoic age shows both post-tectonic and epizonal character. Country rocks include Upper Precambrian-Lower Paleozoic metasedimentary rocks mainly represented by mica-schists, gneisses and migmatites, locally interrupted by minor amphibolite and marble outcrops.This paper deals with representative petrographic and geochemical data that characterize a 150 km2 central stripe between 32°34'-32°42'S and 64°43'-64°52'W.Three granitic facies have been distinguished based on their distinctive modal mineralogy and texture, and upon well known chemical parameters.A K-feldspar megacryst porphydic-type is the areally prevalent facies, but dykes of micro- leucogranites and biotite-phenocryst bearing granite are also well represented. They are all monzogranites of subalkaline and peraluminous chemistry. Their mineralogy shows variable proportions of QAP constituents and micas, with minor phases represented by Fe-Ti oxides, apatite (Ap, titanite (Tt, allanite (Aln.Microgranular enclaves, abundantly distributed in the porphydic facies, provide valuable information for a better understanding of parental magma evolution.The high-Ca content of the melt makes this body quite distinctive compared to its larger northern neighbour, the Achala batholith.Pegmatite and aplite bodies, as well as fluorite bearing breccias and quartz veins, barren or mineralized, are also present within the CA-AC batholith.El batolito Cerro Aspero-Alpa Corral (CA-AC es un cuerpo granítico que aflora en el extremo sur de las Sierras Pampeanas Orientales, en la provincia de Córdoba, República Argentina, cubriendo una superficie cercana a los 440 km2.Es un cuerpo intrusivo postcinemático de probable edad paleozoica. Las rocas encajantes son metamorfitas correspondientes al Prec

  18. Estratigrafía, análisis de facies y paleoambientes de la formación cañadón asfalto en el depocentro jurásico cerro Cóndor, provincia del Chubut Stratigraphy, facies analysis and paleoenvironments of the Cañadón Asfalto Formation, Jurassic Cerro Cóndor depocenter, Chubut province

    Directory of Open Access Journals (Sweden)

    Nora Cabaleri

    2010-05-01

    Full Text Available El depocentro Cerro Cóndor representa la secuencia estratigráfica del Jurásico continental más completa de la cuenca de Cañadón Asfalto y de Sudamérica austral. Se sitúa en la Patagonia extraandina, en ambas márgenes del río Chubut medio. La sedimentación en esta cuenca pull apart, acompañada por efusiones de basalto olivínico, comenzó en el Jurásico Medio temprano. Predominan en la Formación Cañadón Asfalto los depósitos lacustres caracterizados por asociaciones de facies carbonáticas y siliciclásticas intercaladas con rocas lávicas en la base y depósitos piroclásticos hacia el techo de la unidad. Se describe el desarrollo de facies a lo largo de un corte norte-sur que abarca las secciones de estancia El Torito y de los cañadones Los Loros, Las Chacritas, Carrizal, Asfalto y Lahuincó. Las facies/microfacies carbonáticas están representadas por mudstones, wackestones,packstones, grainstones y calizas microbialíticas características de ambientes litorales, marginales y palustres. En la Formación Cañadón Asfalto se distinguen un miembro inferior (Las Chacritas, constituido por calizas, lutitas, areniscas y conglomerados, intercalados con basaltos olivínicos y por otro superior (Puesto Almada compuesto por tobas, tufitas, lutitas y areniscas. El primero es portador de una asociación palinológica de edad bajociano-bathoniana y el segundo de dinosaurios de edad tithoniana. Se describen detalladamente e ilustran las secciones estratigráficas de ambos miembros de la formación en sus localidades tipo, cañadón Las Chacritas y estancia el Torito y se reconstruyen los paleoambientes del depocentro desde el Aaleniano al Tithoniano. La edad del miembro Puesto Almada en su localidad tipo se obtuvo mediante una datación radimétrica (K/Ar de biotitas provenientes de una delgada capa de toba volcánica (147,1 ± 3,3 Ma, Tithoniano proveniente de la parte superior de la unidad.The Cerro Cóndor depocenter represents the

  19. Enfermedad por el virus Ébola medidas de bioseguridad

    OpenAIRE

    2015-01-01

    El virus Ébola representa el patógeno prototipo de fiebre hemorrágica viral, causando una enfermedad severa de alta tasa de mortalidad. Esta alta mortalidad, combinada con la ausencia de vacunación y de un tratamiento específico, hace que el virus Ébola sea un patógeno importante para la salud pública. La fiebre hemorrágica de Ébola se cree es una zoonosis con persistencia del virus en especies de reservorios encontrados en áreas endémicas. A pesar de todos los esfuerzos realizados en cada br...

  20. Roberto Bolaño’s Narrative on Stage: 2666

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    Ana Prieto Nadal

    2017-01-01

    Full Text Available In this paper we set out to analyze the play 2666, a dramatization of the homonymous Roberto Bolaño’s novel, adapted by Pablo Ley and Alex Rigola and directed by this last one. The staging keeps the complexity, fragmentariness and multiperspectivism of the novel, investing in intermediality as well as respecting faithfully the narrative tension of the original and the lyricism of Bolaño’s word.

  1. Beyond biopolitics: reading Bolaño's human fragments

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    Paul Merchant

    2015-12-01

    Full Text Available The bodies of murdered Mexican women in Roberto Bolaño's novel 2666 have been taken by critics to signify the biopolitical power of the neoliberal order. This article will contend that such readings overlook a broader crisis of bodily representation, which is apparent both in 2666 and in Bolaño's earlier novels. The extent to which the body might be ‘read’ as part of a signifying system is insistently challenged in Bolaño’s work, where images of the human are frequently fragmented or unstable. Drawing on ideas from Levinas and Deleuze, I suggest that the difficulty of representing the human, and the political implications of that act, are particularly clear when Bolaño approaches the face. I then argue, following Jean-Luc Nancy, that the theological imagery which accrues around the body of the artist in Bolaño’s work stages the deconstruction of Christian humanist aesthetics. Ultimately, Bolaño’s fragmented bodies invite a mode of reading which is not uniquely concerned with representation.    

  2. Seismological studies at Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Majer, E.L.; McEvilly, T.V.; Albores, A.; Diaz, S.C.

    1980-01-01

    A radio-telemetered 12-station seismographic network was operated in a dense-array configuration over the Cerro Prieto field as shown in Fig. 1. Horizontal and vertical 4.5-Hz geophones were deployed with interstation distances of order 1 km in a multi-purpose survey for microearthquake occurrence and possible anomalies in P- and S-wave velocities and attenuation associated with the field. Although data obtained thus far are limited, attenuation and velocity studies at Cerro Prieto show anomalies related to the production area. This suggests that these data might be useful for delineating the field boundaries. 16 refs.

  3. Overview of Cerro Prieto studies

    Energy Technology Data Exchange (ETDEWEB)

    Lippmann, M.J.

    1983-01-01

    The studies performed on the Cerro Prieto geothermal field, Mexico, since the late 1950's are summarized. Emphasis is given to those activities leading to the identification of the sources of heat and mass, the fluid flow paths, and the phenomena occurring in the field in its natural state and under exploitation.

  4. La avalancha de rocas del cerro Los Cardos (37°10´S,70°53´O en la región norte de la provincia del Neuquén The rock avalanche of Cerro Los Cardos (37° 10´S, 70° 53´ W in the northern region of the province of Neuquén

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    E.F. González Díaz

    2005-03-01

    Full Text Available Se describe una nueva e importante avalancha de rocas, no reconocida hasta ahora, localizada a unos 25 km al oeste de la población de Andacollo. Muestra dos cicatrices o muescas de desprendimiento, de las cuales la austral es interpretada como la muesca principal de su desprendimiento y se halla al pie del borde occidental de una planicie estructural lávica, sobre cuyo extremo norte se ubica el cerro Los Cardos. Es un complejo movimiento, con numerosas escarpas de arranque internas en la masa movilizada, consideradas secundarias, las que al igual que la principal, tienen una general orientación noroeste-sureste. Su mecánica aparenta haberse iniciado como un movimiento translacional (planar a favor de la disposición casi vertical, con fuerte buzamiento hacia el oeste de las capas de la Formación Lileo. Sin embargo, la disposición espacial (cóncavas que adoptan las distintas muescas de arranque (tanto principales como secundarias, permite sugerir un desarrollo y continuación del movimiento como afín a un deslizamiento rotacional. A partir del desprendimiento austral el movimiento general se orientó hacia el sur, hacia el valle del arroyo Lileo, presumiblemente en sucesivos pulsos, identificables por escarpas de arranque internas. En el correspondiente al septentrional el desplazamiento se dirigió hacia el oeste hacia el valle del arroyo Palao. Con posterioridad el movimiento parece estar controlado por la pendiente de dicho valle hacia la afluencia al arroyo Lileo. La porción distal de sus acumulaciones alcanzó a trepar (run-up, el lateral opuesto del valle del arroyo Palao. La laguna de los Rojos se halla en una depresión supuestamente generada por el deslizamiento y fracturamiento de un bloque rocoso desprendido de la planicie estructural lávica de Los Cardos. Diversos factores intrínsecos, establecieron previamente al fenómeno condiciones favorables para el desprendimiento. Se propone como promotor de la avalancha de rocas a

  5. Enfermedad por el virus Ébola medidas de bioseguridad

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    Kattia Bucknor Johnson

    2015-12-01

    Full Text Available El virus Ébola representa el patógeno prototipo de fiebre hemorrágica viral, causando una enfermedad severa de alta tasa de mortalidad. Esta alta mortalidad, combinada con la ausencia de vacunación y de un tratamiento específico, hace que el virus Ébola sea un patógeno importante para la salud pública. La fiebre hemorrágica de Ébola se cree es una zoonosis con persistencia del virus en especies de reservorios encontrados en áreas endémicas. A pesar de todos los esfuerzos realizados en cada brote para identificar los reservorios naturales no se conocen los huéspedes potenciales ni los artrópodos vectores. El manejo de los casos está basado en el aislamiento de los pacientes y en el uso de barreras de aislamiento, tales como ropa e implementos de protección como respiradores. Debido a su rápida propagación la OMS declaró que la enfermedad por el virus Ébola representa una emergencia de salud pública más allá de las fronteras y exhortó a la comunidad internacional a tomar las acciones necesarias para detener la epidemia.

  6. Geothermal drilling in Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez A., Bernardo

    1982-08-10

    The number of characteristics of the different wells that have been drilled in the Cerro Prieto geothermal field to date enable one to summarize the basic factors in the applied technology, draw some conclusions, improve systems and procedures, and define some problems that have not yet been satisfactorily solved, although the existing solution is the best now available. For all practical purposes, the 100 wells drilled in the three areas or blocks into which the Cerro Prieto field has been divided have been completed. Both exploratory and production wells have been drilled; problems of partial or total lack of control have made it necessary to abandon some of these wells, since they were unsafe to keep in production or even to be used for observation and/or study. The wells and their type, the type of constructed wells and the accumulative meters that have been drilled for such wells are summarized.

  7. Designing Functional Virtual Learning Communities Using the Bola Ola Method

    OpenAIRE

    Bolanle A. Olaniran

    2011-01-01

    This paper explores how social media and the likes of Web 2.0 are gaining ground in e-learning and virtual communities. The paper argues that successful learning in virtual learning communities (VLCs) require cultural sensitivity given that technological tools in these communities were not originally designed for learning. The paper uses the dimensions of cultural variability to identify some of the cultural challenges in VLCs. Subsequently, the Bola Ola method is presented as a way to addres...

  8. Update of the conceptual geological model for the geothermal reservoir in Cerro Prieto, BC; Actualizacion del modelo geologico conceptual del yacimiento geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Lira Herrera, Hector [Comision Federal de Electricidad, Mexicali, B.C., (Mexico)

    2005-06-01

    An updated, conceptual geologic model is presented for the geothermal reservoir in Cerro Prieto geothermal field. The tectonic extension that formed the Basin and Range Province of the Western United States and Northwestern Mexico during Upper Tertiary in the Cerro Prieto area resulted in the formation of a half graben tectonic basin between the Cerro Prieto and Imperial faults. Called the Cerro Prieto basin, it includes listric faults, predominately northwest-southwest trending, stepped generally to the northeast. The zone of cortical weakness, formed during the Tertiary, allowed an intrusion of basic rock associated with the magnetic anomaly know as Nuevo Leon. The intrusive rock has been fed by new magmatic intrusions originated by the present tectonic extension of the Gulf of California. The oldest rocks identified in the area are gneiss and biotite-schists of Permian-Jurassic age and tonalities of Jurassic-Cretaceous age in contact with Cretaceous granites, all representing the regional basement. The lithologic column in the subsurface of the Cerro Prieto basin in formed by a basement of Cretaceous granites; an argillaceous package resting on the basement composed of gray shales with interleaves of sandstone, Tertiary brown-shales and mudstone, with an average thickness of 2700 m; clastic sediments of the Quaternary age deposited mainly by the Colorado River and alluvial fans of the Cucapa Range, comprised of gravel, sands and clays with an average thickness of 2500 m, covering the shales. The fluids feeding the geothermal reservoir heat as they pass though the zone where the basic intrusive is located (the heat source) and migrate through the listric faults toward the permeable layers of sandstone located within the gray shales. [Spanish] Se presenta el modelo geologico conceptual actualizado del yacimiento geotermico de Cerro Prieto. La tectonica extensional que origino la Provincia de Cuencas y Cordilleras (Basin and Range) del oeste de Estados Unidos y

  9. Xenolitos ultramáficos en el cerro De la Laguna, volcanismo basáltico de retroarco en el sureste de la provincia de Mendoza, Argentina Ultramafic xenoliths in De la Laguna hill, retro-arc basaltic volcanism in the southeast of Mendoza Province, Argentina

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    G. W. Bertotto

    2002-12-01

    Full Text Available Se describen por primera vez xenolitos ultramáficos incluidos en basaltos de retroarco cenozoicos, en el sector extraandino de la provincia de Mendoza. El basalto portador tiene estructura masiva y textura porfírica con asociaciones de fenocristales de olivino-clinopiroxeno y olivino-plagioclasa. Todos los xenolitos ultramáficos son peridotitas en facies de espinela, se reconocieron lherzolitas, wehrlitas y dunitas, en orden de abundancia. Presentan una asociación mineral compuesta por olivino, ortopiroxeno, clinopiroxeno y espinela. Las texturas identificadas son porfiroclástica de Tipo I y porfiroclástica a equigranular de Tipo I. Estos xenolitos tienen zonas de reacción microscópicas mayormente desarrolladas en los ortopiroxenos y clinopiroxenos en el contacto con el basalto. La presencia de reacción indica al menos un evento de desequilibrio. Estas peridotitas representan fragmentos del manto superior situado debajo de la zona estudiada.Ultramafic xenoliths in Cenozoic retro-arc basalts of the extra-Andean sector of Mendoza province are described here for the first time. The host basalt has a massive structure and porphyritic texture with phenocryst assemblages of olivine-clinopyroxene and olivine-plagioclase. All the ultramafic xenoliths are spinel-bearing peridotites; lherzolite, wehrlite and dunite, in order of abundance, have been recognized. The mineral assemblage is olivine-orthopyroxene-clinopyroxene-spinel. Textures are porphyroclastic Type I and porphyroclastic to equigranular Type I. The xenoliths contain microscopic reaction areas, mainly developed in orthopyroxene and clinopyroxene in the contact with basalt. The reaction indicates at least one disequilibrium event. The peridotites are fragments of the upper mantle situated beneath the study area.

  10. STRUKTUR DAN PRODUKSI LEBAH Trigona spp. PADA SARANG BERBENTUK TABUNG DAN BOLA

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    Putu Ade Hinduari Putra

    2015-12-01

    Full Text Available Lebah tanpa sengat (Trigona spp. dapat menghasilkan madu yang bermanfaat bagi kesehatan. Penelitian bertujuan untuk mengetahui : (1 morfologi Trigona spp., (2 struktur internal sarang Trigona spp. pada sarang berbentuk tabung dan bola, (3 volume sarang serta perkiraan produksi madu, beebread dan selanakan Trigona spp. pada sarang berbentuk tabung dan bola. Penelitian dilaksanakan pada bulan November 2014. Sampel yang digunakan adalah koloni dan sarang Trigona spp. berbentuk tabung dan bola yang diambil di Desa Padang Tunggal,Kecamatan Selat, Kabupaten Karangasem, Bali. Hasil penelitian menunjukan bahwa nama spesies dari sampel koloni Trigona spp. pada sarang berbentuk tabung dan bola adalah Trigona laeviceps. Struktur internal sarang Trigona spp. pada sarang berbentuk tabung dan bola mempunyai pola susunan yaitu pot madu, pot beebread dan pot sel anakan. Volume sarang besar memberikan perkiraan total jumlah produksi madu, beebread dan selanakan lebih banyak dibandingkan volume sarang kecil.

  11. Designing Functional Virtual Learning Communities Using the Bola Ola Method

    Directory of Open Access Journals (Sweden)

    Bolanle A. Olaniran

    2011-12-01

    Full Text Available This paper explores how social media and the likes of Web 2.0 are gaining ground in e-learning and virtual communities. The paper argues that successful learning in virtual learning communities (VLCs require cultural sensitivity given that technological tools in these communities were not originally designed for learning. The paper uses the dimensions of cultural variability to identify some of the cultural challenges in VLCs. Subsequently, the Bola Ola method is presented as a way to address cultural challenges and effective use of VLCs. Finally, implications are presented as well.

  12. provincia de arauco

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    Juan Pablo Gramsch Labra

    2006-01-01

    Full Text Available A raíz de los últimos acontecimientos ocurridos en la provincia de Arauco, relacionados tanto con los temporales como con la fragilidad de su conexión física con la provincia de Concepción, lo que provoca continuos cortes en la Ruta 160, y recurrentes y graves accidentes vehiculares, he querido revisar desde mi especialidad el estado de sus comunas, sus habitantes urbanos y rurales y conocer los aspectos de la habitabilidad con que ellos cuentan. Al respecto, se plantean cuatro preguntas para revisar cómo ha avanzando efectivamente la provincia y sus siete comunas integrantes en esta última década, tomando los datos del Censo 2002 y comparándolos con los del año 1992. La primera interrogante es acerca de su poblamiento, en tanto de si su población ha crecido y cuánto lo ha hecho; nos preguntamos también donde sus habitantes están priorizando vivir, si en el mundo urbano, en el rural, o de preferencia en algunas comunas que en otras, todo esto a partir de lo que podemos extraer de las cifras del Censo para estas comunas araucanas. La segunda pregunta está relacionada con la evolución de las características de sus habitaciones, fundamentalmente a través de datos del parque habitacional, cuánto éste ha crecido, con qué materiales predominantemente, donde ha crecido más y donde menos y cómo ha variado la calidad material de este parque, siempre en relación al total de la región. La tercera pregunta, está planteada en función de las infraestructuras higiénicas y de complemento sanitario a la habitabilidad de las familias en sus viviendas, la calidad y disponibilidad de su agua potable, de su alcantarillado, y de la electricidad. Por último, en la cuarta pregunta relacionada, se revisan los avances de la provincia en equipamientos complementarios al interior de las viviendas, de cómo ha evolucionado la calidad y disponibilidad de los artefactos con que cuentan las familias al interior de los hogares, algunos de ellos de

  13. Formatos de interatividade da TV digital: estudo de caso do quadro ‘Bola Cheia, Bola Murcha’

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    Lígia Campos de Cerqueira Lana

    2011-12-01

    Full Text Available A implantação da televisão digital no Brasil enfrenta desafios técnicos, marcados pelo desenvolvimento tecnológico de novas plataformas, e simbólicos, relacionados aos novos formatos de interatividade com os telespectadores. Este artigo tem por objetivo refletir sobre questões simbólicas da televisão digital a partir do quadro ‘Bola Cheia, Bola Murcha’, do programa ‘Fantástico’ (Rede Globo. O propósito é discutir a integração do telespectador na narrativa televisiva, uma das características do processo da digitalização dos meios. Tendo como base a distinção de Yvana Fechini entre ‘assistir’ e ‘interagir’, mostramos como um quadro bem sucedido da televisão contemporânea trabalha o ‘diálogo intermídia’, conceito de Vera França, como estratégia de produção de seu conteúdo. 

  14. Geohydrology of the Cerro Prieto geothermal aquifer

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez R, J.; de la Pena L, A.

    1981-01-01

    The most recent information on the Cerro Prieto geothermal aquifer is summarized, with special emphasis on the initial production zone where the wells completed in the Alpha aquifer are located. These wells produce steam for power plant units 1 and 2. Brief comments also are made on the Beta aquifer, which underlies the Alpha aquifer in the Cerro Prieto I area and which extends to the east to what is known as the Cerro Prieto II and Cerro Prieto III areas. The location of the area studied is shown. The Alpha and Beta aquifers differ in their mineralogy and cementing mineral composition, temperatures, and piezometric levels. The difference in piezometric levels indicates that there is no local communication between the two aquifers. This situation has been verified by a well interference test, using well E-1 as a producer in the Beta aquifer and well M-46 as the observation well in the Alpha aquifer. No interference between them was observed. Information on the geology, geohydrology, and geochemistry of Cerro Prieto is presented.

  15. Ethos y epos en 2666 de Roberto Bolaño

    OpenAIRE

    Rojas Sierra, Sergio Daniel

    2011-01-01

    La percepción y crítica de la obra de Roberto Bolaño es un trabajo en marcha para los estudios literarios. Como parte de esa dinámica, esta tesis tiene como objetivo comprender el ethos presente en la novela 2666 de Roberto Bolaño a través del análisis de epos de la misma.

  16. Recent activities at the Cerro Prieto field

    Energy Technology Data Exchange (ETDEWEB)

    Alonso, E. H.; Dominguez, A.B.; Lippmann, M.J.; Manon, M.A.; Schroeder, R.C.; Witherspoon, P.A.

    1978-01-01

    The purpose of this paper is to describe some of the latest activities of interest to reservoir engineers at the Cerro Prieto geothermal field. Special emphasis is given to the wells drilled in 1978 for exploration purposes and to provide steam to the existing and future power plants. The present power output is 75MW. Two additional 37.5MW units are scheduled to go on line in March and May 1979, while the total generating capacity at Cerro Prieto will reach about 400MW in 1985. Additional information is available in a number of papers in References 1 and 2.

  17. Roberto Bolaño: the Declension of «I»

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    Zofia Grzesiak

    2016-07-01

    Full Text Available The relationship between autobiography and fiction, as well as the phenomenon of the double, are one of the most popular subjects among the investigators of the works of Roberto Bolaño. Many critics intend to “open” his texts with a “factual key” and discover his truth, describe his way of mixing reality with fantasy. In other words, one of the central problems in Roberto Bolaño’s ouvre is the phnomenon of the autofiction. Instead of participating in the terminological discussions surrounding the subject, in this essay I propose an approach to the different sides of Bolaño through a juxtaposition of three ideas: the dialogism of Mikhail Bakhtin, the “paralactic mode” of Hal Foster and, specifically, the “sylleptic subject” described by a Polish scholar, Ryszard Nycz. These theoretical devices facilitate the description of the process in which Bolaño effectuates the declination of his own identity. The essay consists of a metaphor drawned form the texts of Jorge Luis Boges, a response to other critical readings of Bolaño’s autofiction and an analysis of the literary investigations described by the chilean author. It is concluded by an approach to the “savagery”, Bolaño’s intrinsic condition which reveals itself in the labyrinthic paradigm of his “I”.

  18. Material progress at Cerro Prieto, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Mercado, A.M.

    1978-01-01

    A brief general description is presented about the principal problems observed on the materials used in the Cerro Prieto geothermal project. These include those problems that have been observed in drill pipes, well casing separation equipment and conduction pipes for geothermal water and steam as well as the problems observed in geothermal power plant materials.

  19. Exploration and development of Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Teilman, M.A.; Cordon, U.J.

    1981-01-01

    A brief retrospective of the exploration and field model development at Cerro Prieto are presented. Representative field models are presented for each of the work phases. These models demonstrate how the concept of the field evolved - from a small 2 km/sup 2/ area with a relatively unknown reservoir configuration - to a geothermal resource area over 20 km/sup 2/ where the hydrothermal processes and structural environment are being studied in detail. A model integrating information from these studies was developed.

  20. Vanguardia y violencia en el Cono Sur: Bolaño relee a Arlt

    OpenAIRE

    Castañeda, Luis H.; Middlebury College

    2015-01-01

    Este artículo discute la intersección entre vanguardismo y violencia en las obras de Roberto Arlt (El juguete rabioso, Los siete locos/Los lanzallamas) y Roberto Bolaño (Estrella distante). Se empieza por inscribir a Arlt en un vanguardismo caracterizado por la naturaleza violenta y criminal de la fusión vanguardista del arte y la vida. A continuación se analiza, en la novela de Bolaño, la recontextualización neovanguardista y la evaluación ética del vanguardismo arltiano. El artículo concluy...

  1. Geologic model of the Cerro Prieto geothermal field

    Science.gov (United States)

    Halfman, S. E.; Howard, J. H.; Vonderhaar, S. P.

    1982-09-01

    One of the tasks under the Mexican-American cooperative agreement is the comprehensive geologic study of the Cerro Prieto geothermal field. Using logs from over seventy deep wells as the basic source of information on the subsurface geology, a working model of the Cerro Prieto geothermal field is developed.

  2. Viaje maldito en “La universidad desconocida”, de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Leila Gómez

    2013-01-01

    Full Text Available This paper focuses on the seldom studied poetry of Roberto Bolaño, using "La Universidad Desconocida", the exhaustive compilation published posthumously in 2007. Although Bolaño received wide recognition and many awards for his novels, he defined himself as a poet. In his poetry, we find the same topics and tendencies that he developed in the characters and plots of his narratives. A prime example is "Los detectives salvajes", a novel about a group of young rebel poets in the Mexico of the seventies. Bolaño’s poet characters, as well as his travels, exiles and criticisms of the literary establishment, take on a new light when compared alongside his poetry. this article explores the modes of poetic production as understood by Bolaño, as a way of life outside universities, the literary canon, and any other institutional networks. Instead, his poetic production is marked by the figure of Arthur Rimbaud as the archetype of the cursed poet.

  3. Association of gene BoLA DRB3.2 with production traits in a dairy herd of Antioquia, Colombia

    OpenAIRE

    Juan Zambrano A; Julián Echeverri Z.; Albeiro López-Herrera

    2014-01-01

    ABSTRACTObjective. To determine the associations of BoLA DRB3.2 alleles present in Holstein and BON x Holstein cattle to production and milk quality traits in a dairy herd of Antioquia, Colombia. Materials and methods. Ninety-one cows, 66 Holstein and 25 BxH, were genotyped for the BoLA DRB3.2 gene, through PCR-RFLP technique. Furthermore, the association of the alleles of the gene BoLA DRB3.2 with milk yield (PL305), fat yield (PG305), protein yield (PP305) fat percentage (PGRA) and protein ...

  4. Ricardo Piglia y Roberto Bolaño: tradición y narratividad

    Directory of Open Access Journals (Sweden)

    AndreaTorres Perdigón

    2012-12-01

    Full Text Available Este artículo indaga por las relaciones entre la noción de poder y la tradición literaria en las poéticas de Ricardo Piglia y Roberto Bolaño a partir de sus lecturas críticas. Se analiza en primer lugar en qué sentido se ha estudiado este tema en ambos autores, para luego aludir a la tradición literaria como una circulación de formas en la que actúa un tipo de poder. Después se estudia la valoración crítica de figuras como Roberto Arlt y Jorge Luis Borges dentro de los ensayos de Bolaño y Piglia. Finalmente se muestra cómo estas valoraciones críticas de la tradición revelan aspectos fundamentales de la concepción literaria de los autores y de una forma literaria tradicional que ambos han retomado y desarrollado: la narratividad secuencial.This article investigates the relationship between a concept of power and the literary tradition, as it is conceived by Ricardo Piglia and Roberto Bolaño in their critical essays. We analyze in the first place in what sense this subject has already been studied regarding Bolaño and Piglia, in order to question how one can speak of literary tradition as a form of power. Then we study the critical judgment of figures such as Roberto Arlt and Jorge Luis Borges within the critical texts of Piglia and Bolaño. At the end we show how this critical approaches to the tradition point out fundamental characteristics of their idea of literature and of a literary form developed by both of them: sequential narrativity.

  5. El corrido y la bola suriana: el canto popular como arma ideológica y operador de identidad

    Directory of Open Access Journals (Sweden)

    Catherine Hèau

    1989-01-01

    Full Text Available Through the study of two musical generes, the "bola suriana" and the "corrido Zapatista" of Mexican revolution, the author consisely analyzes the popular song and its ideological power as a mechanism of production of cultural identities.

  6. Association of gene BoLA DRB3.2 with production traits in a dairy herd of Antioquia, Colombia

    Directory of Open Access Journals (Sweden)

    Juan Zambrano A.

    2014-06-01

    Full Text Available Objective. To determine the associations of BoLA DRB3.2 alleles present in Holstein and BON x Holstein cattle to production and milk quality traits in a dairy herd of Antioquia, Colombia. Materials and methods. Ninety-one cows, 66 Holstein and 25 BxH, were genotyped for the BoLA DRB3.2 gene, through PCR-RFLP technique. Furthermore, the association of the alleles of the gene BoLA DRB3.2 with milk yield (PL305, fat yield (PG305, protein yield (PP305 fat percentage (PGRA and protein percentage (PPRO were determined, using a general linear model. Results. Twenty-seven BoLA DRB3.2 alleles were identified; the most frequent alleles in Holstein were: BoLA DRB3.2*23, 22, and 24 with frequencies of: 0.159, 0.129, and 0.106, respectively and the most frequent alleles in BxH were: BoLA DRB3.2*23, 24 and 20 with frequencies of: 0.20, 0.140, and 0.120, respectively. Associations of BoLA DRB3.2 alleles with production and milk quality traits were also determined. In Holstein cows the BoLA DRB3.2*36 allele was associated with low PL305 (p≤0.01, high PGRA in multiparous cows (p≤0.05 and high PG305 in primiparous cows (p≤0.01. The BoLA DRB3.2*33 allele was associated with increased in the PPRO in multiparous cows (p≤0.01. In BXH cows only the BoLA DRB3*19 allele was associated with high PGRA (p≤0.05. Conclusions. The gene BoLA DRB3.2 shows high polymorphism in both groups; Holstein and BxH and some of its allelic variants were associated with production and milk quality traits.

  7. Parabolic trough Project in Cerro Prieto, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Lentz, A.; Cadenas, R.; Almanza, R.; Martinez, I.; Ruiz, V.

    2006-07-01

    Federal Electricity Commission (CFE), the most important electricity Company in Mexico wants to install a parabolic trough row in the Cerro Prieto Geothermal field. Cerro Prieto (CP) is the most important geothermal field in Mexico; this area has the highest levels of irradiance in the country. The levels of irradiance make it feasible to set up a solar collector field in the geothermal field to build a hybrid system in order to increase the steam and electricity production. There are several alternative in the hybrid system, depending where the solar field place is located. Two new options are presented in this paper. The first one uses water from the condenser in DSG with the solar field and steam is separated in the first separator. The second option (DSG), the steam produced is separated in an expansion vessel; the water is reinjected in the solar field and the steam goes to the turbine. This project plans to install an experimental facility to research and learning about the technology, CFE main objective will be the electricity generation; using steam from solar collectors using the existing turbines in CPIV; the second objective is to instruct the workers in the operation of the real facility. The third objective is to study the geothermal flow in the absorbers in Direct Steam Generation (DSG), which has salt and silica dissolved, and look for a possible solution for steam generation. The geothermal facilities have considerable experience using the brine flow, so it is not considered an impediment in the solar-geothermal hybrid system. (Author)

  8. Uma leitura do conto "Detectives" de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Raquel Parrine

    2010-04-01

    Full Text Available By an interpretation of the aesthetics resources used by Roberto Bolaño in his short history “Detectives”, we seek its fictional status, as it contains strong traces of autobiographical motifs — so much as to become a crucial point for its reading. From a comparative analysis of other passages with the same motifs in other Bolaño’s texts, and new forms of thinking the contemporary literature, we can pose a question of what contemporary texts are coming to be in this new century. Is contemporary literature breaking the whole paradigm of literature itself, or this rebellion against its own field is a constitutive part of the institution we came to call literature?

  9. Mito y vanguardia en Los detectives salvajes de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Patricia Espinosa

    2015-07-01

    Full Text Available This article aims to address the disappearance and the specific closure of myth as metaphysical background in Los Detectives Salvajes by Roberto Bolaño; this closure is represented in the novel by the avant-garde poet Cesárea Tinajero, a character that emerges as a concrete life, lost in history, with more courage against systemic or ethical strength, than magical properties that connect with spiritual or religious statements.

  10. Seismological studies at the Cerro Prieto field, 1978 - 1982

    Science.gov (United States)

    Majer, E. L.; McEvilly, T. V.

    1982-10-01

    Varied seismological studies were conducted to determine the static and dynamic properties of the Cerro Prieto geothermal field. Sought were the relation of wave propagation characteristics and microearthquake activity to such features as production boundaries, recharge zones, heat sources, fluid strata, lithology and structure. Discussed are the results of the studies carried out since 1978 in light of the current knowledge of the Cerro Prieto field. Also included are interpretations of the reflection surveys carried out in the immediate production areas.

  11. Ecology of a bolas spider, Mastophora hutchinsoni: phenology, hunting tactics, and evidence for aggressive chemical mimicry.

    Science.gov (United States)

    Yeargan, Kenneth V

    1988-01-01

    Bolas spiders are relatively rare members of the large family known as orb weavers. Instead of using a typical web to capture prey, late-stadia and adult female bolas spiders swing a droplet of adhesive on a thread at flying insects. Mastophora hutchinsoni (Araneae: Araneidae) is one of five Mastophora species known from the United States and occurs over much of eastern North America. It is univoltine in Kentucky and overwinters in the egg stage. Spiderling emerged in May, the diminutive males matured in late June and early July, and females matured in early September. Eggs were produced from late September to late October or early November. This report is the first complete documentation of the population phenology of any bolas spider. Newly-emerged M. hutchinsoni spiderlings did not use a bolas, but instead hunted by positioning themselves on the underside of leaf margins where they ambushed small arthropods that crawled along the leaf margins. Subadult and adult female M. hutchinsoni used a bolas to capture moths. Only male moths were captured, specifically three species of Noctuidae (bristly cutworm, bronzed cutworm, and smoky tetanolita) and one species of Pyralidae (bluegrass webworm). Among 492 prey captured by more than twenty spiders at two sites during 1985 and 1986, smoky tetanolita moths and bristly cutworm moths accounted for 93% of the total. The flight behavior of approaching moths, the limited taxa caught from a large available moth fauna, and the fact that only males were caught support the hypothesis that the spider attracts its prey by producing chemicals which mimic the sex pheromones of these moth species. Adult female M. hutchinsoni frequently captured more than one moth species on a given night. The two most common prey species were active at different times of night, the bristly cutworm soon after nightfall and the smoky tetanolita generally between 11:00 p.m. and dawn. This pattern suggests that mating activity of these moth species may be

  12. Analisis Sinyal Getaran untuk Menentukan Jenis dan Tingkat Kerusakan Bantalan Bola (Ball Bearing

    Directory of Open Access Journals (Sweden)

    Suhardjono Suhardjono

    2004-01-01

    vibration monitoring for predictive maintenance. Abstract in Bahasa Indonesia : Seorang Insinyur (Engineer mesin dapat mendeteksi jenis dan tingkat kerusakan mesin dengan sinyal getarannya bak seorang dokter mendeteksi penyakit pasiennya dengan menganalisa denyut/detak jantungnya. Getaran merupakan respon dari sebuah sistem mekanik baik yang diakibatkan oleh gaya eksitasi yang diberikan maupun perubahan kondisi operasi sebagai fungsi waktu. Gaya yang menyebabkan getaran ini dapat ditimbulkan oleh beberapa sumber misalnya kontak/benturan antar komponen yang bergerak/berputar, putaran dari massa yang tidak seimbang (unbalance mass, misalignment dan juga karena kerusakan bantalan (bearing fault yang akan menjadi topik penelitian ini. Jenis kerusakan bantalan bola baik akibat kerusakan lokal maupun yang terdistribusi ditunjukkan oleh adanya getaran dengan frekuensi tertentu yang muncul, sedangkan tingkat kerusakan pada umumnya diketahui dari besarnya amplitude getarannya. Metode yang paling mutakhir untuk mendeteksi kerusakan pada bantalan bola adalah dengan mengukur karakteristik getarannya baik dalam domain waktu maupun domain frekuensi yang terjadi pada arah radial. Percobaan untuk mengetahui dan mempelajari spektrum getaran akibat kerusakan bantalan bola ini dilakukan pada mesin gerinda bangku dengan mengganti beberapa jenis bantalan yang sengaja dirusak. Analisis perbandingan sinyal getaran antara bantalan bola yang berkondisi baik (normal dan yang dibuat cacat pada komponennya secara bertingkat sedemikian rupa sehingga dapat ditentukan jenis dan tingkat kerusakan bantalan bola tersebut. Secara umum hasil dari percobaan ini dapat disimpulkan bahwa sinyal getaran untuk bantalan yang baik mendekati harmonik (sinusoidal, sedangkan yang rusak sinyal getarannya berbentuk stokastik (random. Untuk menentukan jenis kerusakan lintasan dalam, luar atau kerusakan bola harus disinkronkan antara frekuensi getaran dan perhitungan yang berdasarkan data dari parameter bantalannya, yaitu

  13. Evaluation of geologic characteristics at Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Howard, J.H.; Halfman, S.E.; Vonder Haar, S.P.

    1981-01-01

    Computerized well-log analysis of Cerro Prieto has led to the identification of a relatively large and irregular low-density volume extending from near the surface in the vicinity of Laguna Volcano to greater depths toward the northeast. This low-density volume is located about a plane of symmetry of a self-potential anomaly and a group of northeast trending active faults. The presence of a volume of relatively high-density rock has been recognized at shallow depths in the initially developed part of the resource. It is believed to be due to minerals deposited by cooled, rising geothermal brine. Storativity calculated from well logs at the south end of the western part of the field shows acceptable comparison with storativity calculated from well tests. The amount of fluid produced from the field during the period 1973-1977 is greater than the amount in situ calculated from the completed interval thicknesses. Because this part of the field is still producing today, fluid must be recharging this part of the field.

  14. Induction of a growth-phase-dependent promoter triggers transcription of bolA, an Escherichia coli morphogene.

    Science.gov (United States)

    Aldea, M; Garrido, T; Hernández-Chico, C; Vicente, M; Kushner, S R

    1989-12-01

    The bolA gene, which is involved in the morphogenetic pathways of Escherichia coli, was sequenced and two potential promoters were identified. Expression from promoter P1, proximal to the bolA structural gene is specifically induced during the transition to the stationary phase of growth. This promoter contains an unusual--10 region (CGGCTAGTA), which defines a new class of E. coli promoters necessary for the dramatic increase in the rate of synthesis of a large set of proteins during the cessation of logarithmic growth. This conclusion was confirmed by identifying two additional E. coli promoters and one plasmid promoter, which also were induced during the transition to the stationary phase of growth. Analysis of proteins produced during the exponential and stationary phases of growth in a bolA null mutant suggest a possible role for the BolA protein in the induction of the expression of penicillin-binding protein 6 (PBP6) in the transition to the stationary phase. Supporting this hypothesis is the presence of a putative DNA-binding domain within the bolA coding sequence.

  15. Initial characterization of a bolA homologue from Pseudomonas fluorescens indicates different roles for BolA-like proteins in em>P. fluorescens and Escherichia coli

    DEFF Research Database (Denmark)

    Koch, Birgit; Nybroe, Ole

    2006-01-01

    The RpoS-regulated bolA gene in Escherichia coli is important for the decrease in cell size during stationary phase or sudden carbon starvation. A Pseudomonas fluorescens strain mutated in a gene with homology to bolA reduced its cell size upon carbon starvation, and RpoS had little effect on bol...

  16. Odeim y Oido en Nocturno de Chile de Roberto Bolaño Odeim and Oido in Nocturno de Chile by Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Karim Benmiloud

    2010-12-01

    Full Text Available El artículo se propone estudiar el funcionamiento del dúo Odeim-Oido en la novela Nocturno de Chile de Roberto Bolaño, como protagonistas y enigmas lingüísticos que hay que descifrar. Si toda la crítica coincide en descodificar la pareja en Miedo/Odio, se trata de ver cómo la misma novela programa la descodificación mediante una serie de indicios y variantes léxico-semánticas muy elaboradas. El análisis también propone una descodificación de los códigos culturales que informan al dúo (película policial, cuento de hadas, mitología escandinava, etc.. La reflexión concluye con un análisis sicoanalítico de los dobles (externos e internos en la novela.The following article will study how the couple Odeim-Oido works in the novel Nocturno de Chile by Roberto Bolaño, considering them as protagonists as well as linguistic enigmas to be decoded. If the critical approach manages to decode the couple in Miedo/Odio (Fear/Hate in Spanish, it will have to see how the novel programs the decoding process through a number of elaborated signs and lexical-semantic variants. The essay will also try to decode de cultural signs that lead us to this couple (detective films, fairy tales, Scandinavian mythology, etc.. The article will end with a psychoanalytical analysis of doubles (inner doubles and external ones present in this novel.

  17. ANALISIS TERMAL-ALIRAN KISI BAHAN BAKAR BOLA TERAS RGTT200K DENGAN FLUENT

    Directory of Open Access Journals (Sweden)

    Mohammad Dhandhang Purwadi

    2015-03-01

    Full Text Available Sejalan dengan Perpres No.5/2010, PTRKN-BATAN mengembangkan dua varian desain konseptual reaktor daya maju kogenerasi, yaitu RGTT200K dan RGTT200KT. Energi termal pada kedua sistem reaktor ini dipasok oleh teras reaktor berbahan bakar bola dengan daya termal 200 MWt. Komposisi geometri dan struktur teras didesain agar dapat menghasilkan keluaran pendingin gas helium bertemperatur 950OC sehingga dapat digunakan untuk produksi hidrogen dan atau unit industri proses lainnya secara kogeneratif. Luaran gas helium bertemperatur sangat tinggi ini akan menimbulkan tegangan termal pada bola bahan bakar yang mengancam integritas sistem pengungkungan produk fisi di dalamnya. Oleh karena itu perlu dilakukan analisis termal-aliran untuk mengetahui distribusi temperatur dan aliran pendingin gas helium dalam kisi bahan bakar bola. Salah satu cara terbaik untuk melakukan analisis termal-aliran adalah dengan pemodelan tiga dimensi menggunakan perangkat lunak komputasi dinamika fluida (computational fluid dynamics yang teruji. Dalam penelitian ini digunakan perangkat lunak FLUENT 6.3. Analisis termal aliran pada kisi bola bahan bakar dilakukan dengan memodelkan dinamika fluida pendingin dengan perpindahan panas kombinasi tiga moda, konduksi, konveksi dan radiasi, serta mempertimbangkan adanya turbulensi aliran gas. Model Discret Ordinate dan Reynolds-Averaged Navier-Stokes (RANS masing-masing digunakan dalam perhitungan perpindahan panas radiasi dan turbulensi. Dari distribusi temperatur bola bahan bakar hasil pemodelan CFD dengan aliran turbulen pada pendinginnya diketahui bahwa temperatur maksimum bahan bakar bola mencapai 1036,1OC. Temperatur setinggi ini masih jauh dari temperatur yang dapat menyebabkan kegagalan pengungkungan produksi fisi, yaitu 1600OC. Kata kunci: pemodelan pendinginan, model kisi kubus sederhana, reaktor kogenerasi, RGTT, komputasi dinamika fluida   In accordance to the Presidential Regulation No.5/2010, PTRKN-BATAN develops two variants

  18. Transport of Cerro Hudson SO2 clouds

    Science.gov (United States)

    Doiron, Scott D.; Bluth, Gregg J. S.; Schnetzler, Charles C.; Krueger, Arlin J.; Walter, Louis S.

    The Cerro Hudson volcano in southern Chile (45.92°S, 73.0°W) emitted large ash and sulfur dioxide clouds on August 12-15, following several days of minor activity [Global Volcanism Network Bulletin, 1991]. The SO2 clouds were observed using (preliminary) near real-time data from the Total Ozone Mapping Spectrometer (TOMS) as they encircled the south polar region. The injection of SO2 into the stratosphere has essentially created a gigantic chemical tracer that could provide new insights into the wind patterns and seasonal circulation around the Antarctic region.around the Antarctic region. The TOMS instrument, on board the National Aeronautic and Space Administration's Nimbus 7 satellite, measures the ratio of backscattered Earth radiance to incoming solar irradiance in the ultraviolet spectrum. Although originally designed to measure ozone, it was later discovered that the TOMS instrument could also detect and quantify SO2 [Krueger, 1985]. After this discovery, measurements from TOMS were examined for SO2 emissions for all recorded volcanic eruptions since Nimbus-7 was launched in October 1978, and current data are analyzed as new eruptions occur. The satellite is in a polar, Sun-synchronous orbit so that it crosses the equator at local noon and observes the whole sunlit Earth in approximately 14 orbits each day. Total column amounts of SO2 are determined that represent the amount of gas affecting the reflection of ultraviolet light through a column of the atmosphere from the satellite to the reflecting surface, Earth, given in terms of milli atmospheres centimeter (1000 milli atm cm = a gas layer 1-cm thick at STP). The mass of SO2 is calculated by integrating over the cloud area to obtain a volume, then converting to tons.

  19. Fiebre hemorrágica del Ébola (Ebola Virus Disease)

    Centers for Disease Control (CDC) Podcasts

    2014-08-08

    Este podcast proporciona información general sobre la enfermedad del virus del Ébola y el brote en África Occidental. El programa contiene declaraciones del director de los CDC, Dr. Tom Frieden, así como una breve descripción de las actividades de respuesta de los CDC.  Created: 8/8/2014 by National Center for Emerging and Zoonotic Infectious Diseases (NCEZID).   Date Released: 8/18/2014.

  20. Monsieur Pain, de Roberto Bolaño: a dor da história

    Directory of Open Access Journals (Sweden)

    Graciela Ravetti

    2009-06-01

    Full Text Available Este artigo propõe uma leitura do romance Monsieur Pain, de Roberto Bolaño, como caso exemplar do transgênero performático que, na contemporaneidade, experimenta formas e linguagens para dar conta das tragédias pessoais e históricas sem cair no didatismo. Para isso busca-se elaborar uma reflexão teórica sobre esta obra da perspectiva da experimentação acerca da representação pela linguagem da dor e das perdas pessoais e culturais, individuais e coletivas, enfim, políticas.

  1. From Monomodal to Multimodal Metaphors in the Portuguese sports newspaper A Bola

    Directory of Open Access Journals (Sweden)

    Maria Clotilde Almeida

    Full Text Available Following our comprehensive study of conceptual metaphor occurrences in the Portuguese sports newspaper A Bola (ALMEIDA, 2013 and the research on multimodal metaphor (Forceville, 2008, 2009, 2012, the present paper aims to analyse multimodal metaphors, depicting Cristiano Ronaldo on the covers of this very same newspaper. We wish to uncover conceptual affinities or differences between monomodal and multimodal metaphors as far as their source domains are concerned, namely those of WAR and RELIGION (ALMEIDA, 2013. Upon confronting monomodal and multimodal metaphors, we have unveiled that source domains of multimodal metaphors appear to be more restrictive in comparison to the vast panoply of source domains in monomodal metaphors (ALMEIDA, 2013.

  2. Biopolitics in Roberto Bolaño’s 2666, “The Part About the Crimes”

    OpenAIRE

    Camelia Raghinaru

    2016-01-01

    Starting from Agamben’s theories of state of exception, and sovereignty and subalternity, this article looks at Roberto Bolaño’s 2004 novel, 2666, as a critique of neoliberal capitalism, where the law is predicated on violence and exploitation of surplus humanity—in this case, the poor female maquiladora workers at the U.S./Mexico border. Narco-trafficking and misogyny are symptomatic of a juridical and economic order that revolves around exploitation as central to the workings of transnation...

  3. As formações em bolas argênticas do sistema nervoso simpático

    Directory of Open Access Journals (Sweden)

    José Fernandez

    1957-09-01

    Full Text Available Foram estudados, histològicamente, gânglios simpáticos provenientes de 40 pacientes portadores de enfermidades variadas e 40 gânglios tidos como normais, para pesquisar as formações cm bolas argênticas. As impregnações foram feitas pelos métodos de Cajal, Arteta, Castro, Gros, Bielschowsky e Agduhr. Foi verificado que a presença de bolas argênticas é mais constante nas doenças circulatórias periféricas; nestas afecções, foi verificada, também, a presença de um pigmento corável pelos tricrômios de Gomori e de Goldner e que, possìvelmente, tem o mesmo significado que os descritos por Fedorow 12 corados pelo vermelho neutro; tais pigmentos foram relacionados com as formações em bolas argênticas, levando em consideração os trabalhos experimentais dos autores da escola russa. A presença das formações em bolas argênticas, tanto nos casos normais como nos patológicos, é atribuída a uma hiperfunção, por excitação, do simpático, por serem mais numerosas nos casos de transtornos periféricos. Foi observado que os neurônios em íntimo contacto com as formações em bolas argênticas, apresentam sempre alterações que vão desde o grau mais leve (tumefação do soma celular, retificação dos prolongamentos, neurofibrilas mais fortemente impregnadas, até o mais grave (hiperplasia e hipertrofia dos dendritos, degeneração retrátil, degeneração pigmentar. Foi notado que as terminações das fibras pré-ganglionares e as próprias fibras apresentam, muitas vêzes, alterações (hipertrofia, sinuosidade e grande poder de impregnação; as bolas argênticas foram observadas tanto no final dos dendritos como no das fibras pré-ganglionares. Foram encontradas formações de bolas argênticas em rosário, concluindo-se que elas têm a mesma significação que as alterações claviformes. Conclui-se, finalmente, que as bolas argênticas são produtos patológicos.

  4. Bolaño en el camino: El viaje como búsqueda de identidad en Los detectives salvajes

    Directory of Open Access Journals (Sweden)

    Gustavo Pierre Herrera López

    2012-06-01

    Full Text Available What are looking for the main characters of Los detectives salvajes by Roberto Bolaño in the desert? The following essay proposes a reading of travels in Bolaño’s work, as journeys on which there are a research of identity denied by the ruling culture; the journey to the desert are presented as the transition moment between the modern condition of the characters and the postmodern condition, and the traveler like the person who reads his life like a fiction.

  5. Del valle al cerro: el sitio del Cerro Zapotecas durante el Epiclásico

    OpenAIRE

    Salomón Salazar, María Teresa

    2008-01-01

    El objetivo de esta tesis es definir qué tipo de asentamiento era el Cerro Zapotecas durante el periodo Epiclásico (600-900 d.C.), ubicado a escasos tres kilómetros de Cholula. Los antecedentes de investigación en este sitio lo señalan como un centro focal de las actividades del valle de Puebla-Tlaxcala durante la transición del Clásico al Posclásico. Esta investigación llevó a cabo un nuevo recorrido de superficie con el cual se documentó la composición arquitectónica y ...

  6. Latin America through the Literary Looking-Glass, And What Bolaño Found There

    Directory of Open Access Journals (Sweden)

    Stramskas Arnoldas

    2014-03-01

    Full Text Available Šis straipsnis plačiai apžvelgia socialinę, ekonominę ir kultūrinę politiką Lotynų Amerikoje, skiriant daug dėmesio septintojo ir aštuntojo dešimtmečio literatūrinio „bumo” fenomenui, bei regiono politiniam kontekstui - kolonijinei praeičiai, neokolinijinei/ neoliberaliai dabarčiai, intelektualų rolei valdžios ir kultūros sferose. Antroji straipsnio dalis koncentruojasi ties Roberto Bolaño (ir jo romanu Pašėlę detektyvai, rašytoju, kuris paženklino Lotynų Ameriką pasauliniame literatūros žemėlapyje mastu, panašiu į sėkmingiausius bumo pavyzdžius. Šio straipsnio tikslas yra parodyti, kad literatūra ne tik gali sietis bendrais elementais ir galimais tikslais su socialine ir politine kritika, bet kad ir gali būti efektyvi sociopolitinės kritikos forma. Tokiu atveju, Bolaño darbai gali būti perskaityti ne tik kaip antrarūšė fi kcija, bet kaip ir daugiasluoksnis tyrimas apie socioekenominę bei ontologinę Lotynų Amerikos būklę, kurios kiti tyrimo būdai gali ir neužčiuopti.

  7. Geophysical monitoring at the Cerro Prieto geothermal field

    Science.gov (United States)

    Wilt, M.; Zelwer, R.; Majer, E. L.

    1982-09-01

    A program of reservoir monitoring at the Cerro Prieto geothermal field using surface geophysical methods with the objective of observing changes resulting from production is described. The three methods used, dipole-dipole resistivity, precision gravity, and passive seismic monitoring, are discussed.

  8. Hydrophobic Mismatch and Phase Transition in a Membrane Composed by a Mixture of Linear and Bola Phospholipids

    Science.gov (United States)

    Longo, Gabriel; Szleifer, Igal

    2006-03-01

    Archeobacteria are microorganisms that can survive and proliferate in extreme habitats, such as high salt concentration environments, anaerobic conditions, and high or low temperatures. A membrane composed of bolaform phospholipids is what gives these unique survival qualities to the bacteria. The nature and composition of this membrane has not yet been elucidated. In this work, a membrane composed by a mixture of linear and bola phospholipids is studied using a molecular theory. The effect of changing the fraction of bolaform phospholipids, as well as the length of the hydrocarbon chain of the linear lipid are studied. A phase separation in the mixture between a thin bola rich membrane and a thick linear rich membrane is found. The thin membrane is mainly composed by ``spanning'' bola molecules whose polar heads are in opposed hydrophilic regions of the membrane. The phase separation is only present when the hydrocarbon chains of both molecular species have comparable sizes. The driving force for the phase separation is the size matching between the hydrophobic chains of the linear phospholipid and the spanning bola lipid.

  9. Variant non ketotic hyperglycinemia is caused by mutations in LIAS, BOLA3 and the novel gene GLRX5

    DEFF Research Database (Denmark)

    Baker, Peter R; Friederich, Marisa W; Swanson, Michael A

    2014-01-01

    -onset spastic paraplegia, spinal lesion, and optic atrophy. Clinical features of BOLA3-associated variant nonketotic hyperglycinemia include severe neurodegeneration after a period of normal development. Additional features include leukodystrophy, cardiomyopathy and optic atrophy. Patients with lipoate synthase...

  10. El México abismal de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Felipe Adrián Ríos Baeza

    2016-07-01

    Full Text Available Este trabajo de análisis no solo resalta la presencia de México, en cuanto motivo literario y espacio refractado estéticamente, en la literatura de Roberto Bolaño, cuestión que ha atraído a la mayoría de la crítica especializada, sino analiza su comportamiento y su influjo en diversos personajes, con el propósito de demostrar la hipótesis de que dicho país deviene algo más que una referencia. En su obra, México resulta un acontecimiento, como se entiende en la crítica posestructuralista, capaz de alterar la percepción de quienes allí habitan o arriban, posibilitando la invención de un territorio altamente caótico y cambiante.

  11. ¿Qué deber saber un médico sobre el ébola?

    Directory of Open Access Journals (Sweden)

    2014-12-01

    Full Text Available El reciente brote provocado por el virus Ébola en varios países del oeste africano (Guinea, Liberia, Sierra Leona y Nigeria, se ha traducido, según el último informe de la Organización mundial de la Salud (OMS, en 13.567 infectados y 4.951 fallecidos, cifra que se cree, está subestimada debido a los inexistentes sistemas de sanitarios disponibles en los países centro de la epidemia. Con una mortalidad cercana al 40% ha supuesto una gran preocupación para todos servicios de salud pública mun-diales, especialmente, una vez que se ha tenido conocimiento de los primeros casos en los países desarrollados

  12. Mito e sociedade na literatura latino-americana: Neruda, Carpentier, Bolaño

    Directory of Open Access Journals (Sweden)

    Pedro Dolabela Chagas

    2013-09-01

    Full Text Available Resumo: Discussão sobre a problemática identitária na literatura latino-americana: a sua associação oitocentista à representação da natureza e da paisagem social; a sua longa duração entre os séculos XIX e XX; a sua politização pela dicotomia entre a América Latina e o Centro representado pela Europa e pelos EUA. A construção da identidade como produção de mitos: como construção de passados úteis, valoração positiva ou negativa do presente, projeção de futuros possíveis. A presença do mito em Canto geral, de Pablo Neruda; a sua recusa em 2666, de Roberto Bolaño; discussão sobre as razões desta recusa: a concentração no presente em detrimento da projeção do futuro. Localização de um tensionamento embrionário do mito identitário em Os passos perdidos, de Alejo Carpentier: discussão sobre os termos de orientação deste tensionamento e a diferença que ele produzia em relação à história anterior do romance latino-americano. Sugestão do fechamento recente da época histórica dominada pela problemática identitária na narrativa latino-americana.Palavras-chave: Pablo Neruda; Alejo Carpentier; Roberto Bolaño; romance latino-americano; mito e identidade. Abstract: The problematic of identity representation in Latin- American literature: its 19th Century association to the representation of nature and the social landscape; its long duration in the 19th and 20th Centuries; its politicization through the dichotomy between Latin America and a Center represented by Europe and the USA. Identity construction as a production of myths: as a construction of usable pasts, as a positive or negative evaluation of the present, as a projection of possible futures. The presence of myth in Pablo Neruda’s Canto general; its rejection in Roberto Bolaño’s 2666; the possible reasons of this rejection: a concentration in the present in detriment of the future. Location of an embrionary tensioning of the identity myths

  13. The Escherichia coli BolA Protein IbaG Forms a Histidine-Ligated [2Fe-2S]-Bridged Complex with Grx4.

    Science.gov (United States)

    Dlouhy, Adrienne C; Li, Haoran; Albetel, Angela-Nadia; Zhang, Bo; Mapolelo, Daphne T; Randeniya, Sajini; Holland, Ashley A; Johnson, Michael K; Outten, Caryn E

    2016-12-13

    Two ubiquitous protein families have emerged as key players in iron metabolism, the CGFS-type monothiol glutaredoxins (Grxs) and the BolA proteins. Monothiol Grxs and BolA proteins form heterocomplexes that have been implicated in Fe-S cluster assembly and trafficking. The Escherichia coli genome encodes members of both of these proteins families, namely, the monothiol glutaredoxin Grx4 and two BolA family proteins, BolA and IbaG. Previous work has demonstrated that E. coli Grx4 and BolA interact as both apo and [2Fe-2S]-bridged heterodimers that are spectroscopically distinct from [2Fe-2S]-bridged Grx4 homodimers. However, the physical and functional interactions between Grx4 and IbaG are uncharacterized. Here we show that co-expression of Grx4 with IbaG yields a [2Fe-2S]-bridged Grx4-IbaG heterodimer. In vitro interaction studies indicate that IbaG binds the [2Fe-2S] Grx4 homodimer to form apo Grx4-IbaG heterodimer as well as the [2Fe-2S] Grx4-IbaG heterodimer, altering the cluster stability and coordination environment. Additionally, spectroscopic and mutagenesis studies provide evidence that IbaG ligates the Fe-S cluster via the conserved histidine that is present in all BolA proteins and by a second conserved histidine that is present in the H/C loop of two of the four classes of BolA proteins. These results suggest that IbaG may function in Fe-S cluster assembly and trafficking in E. coli as demonstrated for other BolA homologues that interact with monothiol Grxs.

  14. Brine treatment test for reinjection on Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Hurtado, R.; Mercado, S.; Gamino, H. (Departamento de Geotermia, Division de Fuentes de Energia, Instituto de Investigaciones Electricas, Justo Sierra y Herreros Sur 2098-Altos C.P. 21020, Mexicali, B.C. (MX))

    1989-01-01

    Reinjection of disposal brine from the Cerro Prieto Geothermal Power Plant System is attractive mainly because, on top of solving the brine disposal problem, it may significantly contribute to extend the reservoir useful lifetime, through thermal and hydraulic recharge. Because the high concentration of colloidal silica in the disposal brine, laboratory and pilot plant tests were conducted in order to develop the brine treatment process. Addition of 20-40 mg/1 lime to flashed and aged brine for 10-20 minutes yields a clarified brine relatively low in suspended solids (10-30 mg/1) when the over flow rate is 38.5 1/min-m/sup 2/. 1.1 mills/kWh was the estimated cost for treatment of 800 kg/s of separated brine from the Cerro Prieto I power station.

  15. Criteria for determining casing depth in Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Olivas M., H.M.; Vaca S., J.M.E.

    1982-08-10

    On the basis of geological data obtained during drilling and its relation to electric logs, together with the problems that arose when drilling through formations until the production zone was reached, it is possible to establish the most suitable manner to line a well and thus formulate an optimum casings program. The main criteria to be taken into consideration in preparing such a program and its application in the drilling of wells programmed in Cerro Prieto to optimize and economize such drilling and achieve suitable techniques for well completion are presented. The criteria are based on the characteristics of the Cerro Prieto field and on casing design factors, as well as a experience gained during drilling in such a field.

  16. Open file data on the Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Lippman, M.J.; Aguirre, B.D.; Wollenberg, H.A.; Witherspoon, P.A.

    1977-04-01

    Some of the unpublished data presently available on open file at the Lawrence Berkeley Laboratory are listed and described. In addition, in the files are a number of internal memoranda of the Commission Federal de Electricidad of Mexico (CFE) on chemical characteristics of the produced fluids and incrustations; published papers on Cerro Prieto and the geologic setting of the Salton Trough; and data on the hydrogeology of the Mexicali Valley. (MHR)

  17. Dating thermal events at Cerro Prieto using fission track annealing

    Energy Technology Data Exchange (ETDEWEB)

    Sanford, S.J.; Elders, W..

    1981-01-01

    Data from laboratory experiments and geologic fading studies were compiled from published sources to produce lines of iso-annealing for apatite in time-temperature space. Fission track ages were calculated for samples from two wells at Cerro Prieto, one with an apparently simple and one with an apparently complex thermal history. Temperatures were estimated by empirical vitrinite reflectance geothermometry, fluid inclusion homogenization and oxygen isotope equilibrium. These estimates were compared with logs of measured borehole temperatures.

  18. Early mineralization at Cerro de Pasco (central Peru) revisited

    OpenAIRE

    Rottier, Bertrand; Casanova, Vincent; Fontboté, Lluis; Kouzmanov, Kalin; Alvarez, Hugo; Bendezú, Ronner

    2013-01-01

    The large Cerro de Pasco Cordilleran base metal deposit in central Peru is located on the eastern margin of a Middle Miocene diatreme-dome complex. A striking characteristic is the presence of a N-S trending massive funnel-shape pyrite-quartz replacement ore body that contains pyrrhotite pipes grading outwards to lead-zinc replacement bodies, along the eastern contact of the diatreme-dome complex. Earlier workers interpreted the pyrrhotite pipes as postdating the pyritequartz body. This study...

  19. Estratigrafia e estrutura do Cerro do Jarau: nova proposta

    Directory of Open Access Journals (Sweden)

    Joana Paula Sánchez

    Full Text Available A estrutura do Cerro do Jarau está localizada no Estado do Rio Grande do Sul, nas proximidades de Quarai, divisa com o Uruguai. É uma estrutura circular de aproximadamente 8 km de diâmetro, cujos dados geológicos apontam para uma origem por impacto meteorítico. Está situada na Bacia do Paraná e compreende uma área de afloramento de arenitos na porção central, circundada por basaltos da Formação Serra Geral. Nos trabalhos publicados, o arenito da porção central é interpretado como pertencente à Formação Botucatu, soerguido em meio aos basaltos da Formação Serra Geral, correspondendo, para muitos autores, a uma feição dômica. O objetivo do presente trabalho é apresentar novos dados sobre a estratigrafia e estrutura do Cerro do Jarau, que mostram que os arenitos estão estrutural e estratigraficamente sobrepostos aos basaltos e ambas unidades exibem mergulhos centrípetos. A estrutura do Cerro do Jarau é, portanto, uma bacia com a porção central rebaixada, e não um domo como antes admitido.

  20. Current state of the hydrothermal geochemistry studies at Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Fausto L, J.J.; Jimenez S, M.E.; Esquer P, I.

    1981-01-01

    The current state of hydrothermal geochemistry studies being carried out at the field are reported. These studies are based on the results of chemical analysis of water samples collected during 1979 and 1980 at the geothermal wells of the area known as Cerro Prieto I, as well as from those located in the Cerro Prieto II and Cerro Prieto III areas, some of which have only recently started flowing. Data are presented on the chemical variations of the main chemical constituents dissolved in the waters, as well as on the Na/K and Na-K-Ca chemical relations and the temperatures calculated from them and from SiO/sub 2/. Fluid recharge into the reservoir and its direction of flow are interpreted from isotherm contour maps of the field prepared from Na/K and Na-K-Ca geothermometry and from concentration contour maps of some of the main chemical constituents. Well M-43 is discussed as an example of a well affected by well completion problems in its production casing. Its behavior is explained on the basis of the chemical characteristics of the produced water. The chemical changes that have taken place in some of the wells during production are explained by correlating the chemistry with the production mechanisms of the well (steam-water production rates).

  1. Correlation between precision gravity and subsidence measurements at Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Zelwer, R.; Grannell, R.B.

    1982-10-01

    Precision gravity measurements were made in the region of the Cerro Prieto geothermal field at yearly intervals from 1977 to 1981 to assess the feasibility of using gravity to determine subsurface reservoir changes with time. The extent of mass recharge in response to the continued production of fluids from this field was studied. Changes in gravity and ground elevation were observed throughout the region for the period of observation. Results indicate that the largest changes observed were the result of the Magnitude 6.1 (Caltech) Victoria earthquake of 8 June 1980. The epicenter of this earthquake was located 25 km southeast of the field on the Cerro Prieto Fault, which bounds the field on the southwest. Subsidence of up to 55 cm was measured east of the power plant, in the region between the northern end of the Cerro Prieto Fault and the southern end of the Imperial Fault. This area has been postulated to be the site of an active spreading center or pull-apart basin, and has been characterized by a high level of seismic activity during the last 10 years. Minor subsidence and small related gravity changes for the period preceeding the Victoria earthquake suggest that in spite of large fluid production rates, the reservoir is being almost completely recharged and that a measurable increase in subsurface density may be taking place. The results of measurements of horizontal ground motions made in this area are discussed in relation to the gravity and subsidence observations.

  2. Microfossils from Cerro Prieto geothermal wells, Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Cotton, M.L.; Haar, S.V.

    1982-08-10

    To aid in a paleonenvironmental and age reconstruction of the Cerro Prieto reservoir system, 59 samples of well cuttings were analyzed for microfossils. The cuttings were obtained at depths from 351 to 3495m in 14 geothermal wells in the Cerro Prieto field, Baja California, Mexico. Foraminifera was found in 6 samples, ostracodes in 19 samples and mannoplankton as coccoliths in 24 samples. Other groups, such as molluscus, insects, fish skeletal parts, and plant material were occasionally present. Detailed interpretations at this time cannot be made because of poor preservation of samples. This is primarily due to causes: dissolution by geothermal fluids that reach 350/sup 0/C, and the extensive mixing of filled Cretaceous forms (reworked from the Colorado Plateau region) with Tertiary species during drilling. Further studies of ostracodes and foraminifera from colder portions of the wells are needed. The abundant and well-preserved ostracodes indicate marine to backish water inviroments that correspond in part, to lagoonal or estuarine facies. The presence of the mid-Tertiary (15-m.y.-old) marine foraminifera, Cassigerinela chipolensis, in wells M-11 and M-38, 350 to 500m deep, is perplexing. These are not laboratory contaminates and, as yet have not been found in the drilling mud. If further studies confirm their presence at Cerro Prieto, established ideas about the opening of the Gulf of California and about Pacific Coast mid-Tertiary history will need to be rewritten.

  3. Correlation between precision gravity and subsidence measurements at Cerro Prieto

    Science.gov (United States)

    Zelwer, R.; Grannell, R. B.

    1982-10-01

    Precision gravity measurements were made in the region of the Cerro Prieto geothermal field at yearly intervals from 1977 to 1981 to assess the feasibility of using gravity to determine subsurface reservoir changes with time. The extent of mass recharge in response to the continued production of fluids from this field was studied. Changes in gravity and ground elevation were observed throughout the region for the period of observation. Results indicate that the largest changes observed were the result of the Magnitude 6.1 (Caltech) Victoria earthquake of 8 June 1980. The epicenter of this earthquake was located 25 km southeast of the field on the Cerro Prieto Fault, which bounds the field on the southwest. Subsidence of up to 55 cm was measured east of the power plant, in the region between the northern end of the Cerro Prieto Fault and the southern end of the Imperial Fault. This area has been postulated to be the site of an active spreading center or pull-apart basin, and has been characterized by a high level of seismic activity during the last 10 years.

  4. Microfossils from Cerro Prieto geothermal wells, Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Cotton, M.L.; Vonder Haar, S.

    1980-01-01

    To aid in a paleoenvironmental and age reconstruction of the Cerro Prieto reservoir system, 59 samples of well cuttings were analyzed for microfossils. The cuttings were obtained at depths from 351 to 3495 m in 14 geothermal wells in the Cerro Prieto field, Baja California, Mexico. We found foraminifera in 6 samples, ostracodes in 19 samples, and nannoplankton as coccoliths in 24 samples. Other groups, such as molluscs, insects, fish skeletal parts, and plant material were occasionally present. Detailed interpretations are not possible at this time because of poor preservation of samples. This is primarily due to causes: dissolution by geothermal fluids that reach 350{sup 0}C, and the extensive mixing of filled Cretaceous forms (reworked from the Colorado Plateau region) with Tertiary species during drilling. Further studies of ostracodes and foraminifera from colder portions of the wells are needed. The abundant and well-preserved ostracodes indicate marine to brackish water environments that correspond, in part, to lagoonal or estuarine facies. The presence of the mid-Tertiary (15-My-old) marine foraminifera, Cassigerinela chipolensis, in wells M-11 and M-38, 350 to 500 m deep, is perplexing. These are not laboratory contaminates and, as yet, have not been found in the drilling mud. If further studies confirm their presence at Cerro Prieto, established ideas about the opening of the Gulf of California and about Pacific Coast mid-Tertiary history will need to be rewritten.

  5. Estudios termométricos de granitoides de Algarrobo del Águila, provincia de La Pampa Thermometric Studies from Algarrobo del Aguila granitoids, province of La Pampa

    Directory of Open Access Journals (Sweden)

    T Montenegro

    2003-12-01

    Full Text Available Los plutones graníticos de Algarrobo del Águila, provincia de La Pampa, forman parte del Complejo Intrusivo Algarrobo del Águila y afloran en el bloque de Las Matras. Tienen edad permo-triásica y constituyen cerros de escasa altura. Los principales afloramientos son Puesto Los Cerros, Puesto Las Tinajeras y Cerro Colorado. Hacia el oeste, cerca del límite con Mendoza, se encuentra, en forma aislada, el monzogranito de Chos Malal. Las edades obtenidas por el método K/Ar sobre roca total son de 256,8 ± 5,5 Ma para Cerro Colorado y 197,9 ± 3,9 Ma para Puesto Los Cerros. Los cuerpos ígneos se caracterizan por una amplia variación textural con transición hacia términos volcánicos, indicativos de una rápida cristalización en ambientes de profundidad somera. La cristalización del cuarzo tiene lugar bajo diferentes presentaciones. A partir de 370º y hasta 260°C los megacristales de cuarzo capturaron fluidos de composición compleja H2O-NaCl-CO2, con salinidad elevada y concentración de CO2 no mayor a 0,04% molar. En las miarolas, el cuarzo cristalizó entre 335º y 235°C y en las venas entre 330º y 300°C, con salinidades de hasta 14% equivalente en peso NaCl. Los feldespatos potásicos tienen un grado de ordenamiento intermedio lo que indica un enfriamiento rápido a temperaturas inferiores a 400°C. Estas temperaturas son congruentes con la cristalización de microclino sin las maclas según leyes de Albita-Periclino. La presencia de minerales como fluorita, apatito y turmalina, sumado a todas las anteriores características, son indicativos de la cúpula de un plutón emplazado en niveles someros.The granitic stocks of Algarrobo del Aguila, in the province of La Pampa, are assembled in "Complejo Intrusivo Algarrobo del Aguila" and they crop out in Las Matras Block forming smooth and small hills. Main outcrops of these Permian-Triassic granites are Puesto Los Cerros, Puesto Las Tinajeras and Cerro Colorado. The isolated outcrops

  6. Panama Canal Zone. Cerro Tigre, Fort Gulick, Gamboa Met Van No. 1.

    Science.gov (United States)

    The report contains the following meteorological data collected at sites within Fort Gulick and Cerro Tigre , Panama during December 1970: Atmospheric precipitation; Atmospheric temperature; Wind; Atmospheric pressure.

  7. Seismotectonics of the Cerro Prieto Geothermal Field, Baja California, Mexico.

    Science.gov (United States)

    Rebollar, C. J.; Reyes, L. M.; Quintanar, L.; Arellano, J. F.

    2002-12-01

    We studied the background seismic activity in the Cerro Prieto geothermal field (CPGF) using a network of 21 digital stations. Earthquakes are located below the exploitation area of the CPGF, between 3 and 12 km depth, within the basement. Earthquakes follow roughly a N30°E trend perpendicular to the Cerro Prieto fault. This activity is located on a horst-like structure below the geothermal field and coincides with the zone of maximum subsidence in the CPGF. Two earthquake swarms occurred along the SE-NW strike of the Cerro Prieto fault and in the neighborhood of the Cerro Prieto volcano. Magnitudes range from -0.3 to 2.5. A Vp/Vs=1.91 ratio of the activity below the volcano suggests a water-saturated medium and/or a partial-melt medium. We calculated 76 focal mechanisms of individual events. On June 1 and September 10, 1999, two earthquakes of Mw 5.2 and 5.3 occurred in the basement at depths of 7.4 and 3.8 km below the CPGF. Maximum peak accelerations above the hypocenter ranged from 128.0 to 432.0 cm/s2. Waveform modeling results in a fault geometries given by strike=236°, dip=60°, rake=-58° (normal) and strike=10°, dip=90°, rake=159° (right lateral strike-slip) for the June and September events. Observed triangular source time function of 0.7 seconds and a double source with a total duration of 1.9 seconds for the June and September events were used to calculate the synthetics seismograms. Static stress drops and seismic moments for the June and September events are: Δ\\sigma=82.5 MPa (825 bars), Mo= 7.65x1016 Nm (7.65x1023 dyne-cm) and Δ\\sigma=31.3 MPa (313 bars) and Mo=1.27x1017 Nm (1.27x1024 dyne-cm). These stress drops are typical of continental events rather than stress drops of events originated in spreading centers. We concluded from the focal mechanisms of the background seismicity and June and September 1999 events, that a complex stress environment exits in the CPGF due to the continual thinning of the crust in the Cerro Prieto basin.

  8. Zur Politik der Intertextualität in Roberto Bolaños ‚Estrella Distante‘

    Directory of Open Access Journals (Sweden)

    Samir Sellami

    2014-12-01

    Full Text Available Am Beispiel von Bolaños 1996 erschienenem Kurzroman Estrella Distante untersucht der Beitrag die spezifische Logik der Intertextualität in Bolaños Poetik. Seine implizite Logik der Intertextualität entwickelt sich dabei nicht im luftleeren Raum, sondern im Kontrastverhältnis zu der erzählten Poetik des Protagonisten Carlos Wieder. Dessen formal progressive, aber politisch reaktionär motivierte Poetik deckt die fundamentale Ambivalenz avantgardistischer Poetiken auf und führt zur gegensätzlichen Affirmation einer metabolischen Intertextualität, die den körperlichen und gelebten Kontakt mit dem Literarischen in den Vordergrund stellt. In dieser Konstellation wird Estrella Distante lesbar als poetischer Widerstand und literarische Vergeltung an der historischen Wirklichkeit.

  9. Estudio crítico sobre Roberto Bolaño: literatura, identificaciones imaginarias y registros modélicos

    Directory of Open Access Journals (Sweden)

    C. Valeria Bril

    2015-09-01

    Full Text Available The article analyzes the figure of writer Roberto Bolaño (1953-2003, from his emergence in literary circles, depending on what the discourse of critical lists and addresses at different times as to the evolution of the author and his work. What we are proposing is to find out what happens with the case "Bolaño", the contemplation of caring if the particular situation of a paradigmatic figure who built a remarkable subjectivity evoked in his work as an essential link to the affirmation of the individual who writes, who is subtracted from the traditional literary aesthetic ideals that work for other contemporary Latin American authors.

  10. CASCABELES DE COBRE EN LA CULTURA BOLAÑOS, JALISCO (Copper Bells in the Bolaños Culture, Jalisco

    Directory of Open Access Journals (Sweden)

    María Teresa Cabrero G.

    2013-10-01

    Full Text Available En el sitio de El Piñón, perteneciente a la cultura Bolaños, se recuperaron siete cascabeles pequeños de forma globular elaborados en cobre nativo y elementos traza de arsénico y plata. Como en otros sitios del occidente de México, se encontraron asociados a entierros, lo cual sugiere una relación religiosa enfocada a la muerte. Las circunstancias sociales y económicas de este hallazgo, en especial dentro de la cultura Bolaños y en el centro rector de la región como lo fue El Piñón, es probable que representaran objetos de muy alto valor que llegaron al sitio como un regalo destinado al grupo de poder, como lo atestiguan los entierros donde fueron encontrados. ENGLISH: At the site of El Piñon, belonging to the Bolaños Culture, seven small globular bells made in native copper were recovered. The bells have trace elements of arsenic and silver. Like other sites in western Mexico, these objects were associated with burials, suggesting a religious relationship focused on death. The social and economic circumstances of this find, particularly within the Bolaños Culture and given El Piñon’s location near the governing center of the region, likely represent very high value items that reached the site intended as a gift for the group in power, as evidenced by the burials where the bells were found.

  11. Roberto Bolaño y las reelecturas de la novela negra: La pista de hielo

    Directory of Open Access Journals (Sweden)

    Mirian Pino

    2006-01-01

    Full Text Available El objetivo de este artículo es realizar una lectura crítica de una de las numerosas novelas negras escritas por Roberto Bolaño (1953-2003. De la bibliografía crítica en torno a su obra, La pista de hielo es quizá uno de los textos menos trabajados; sin embargo en él están contenidos una serie de principios composicionales que implican una re lectura del género. Los mismos anticipan claves de lecturas que pulverizan aspectos que señalan, paradójicamente, la necesidad de su muerte para mostrar la vigencia del relato negro. Podríamos pensar que "el ataque" a leyes del género, realizados desde dentro del mismo, vivencian, a través de sus personajes y situaciones, no sólo la posibilidad de la existencia de un cadáver sino también arrojarlo y arrojarse al vacío de fin de siglo y principios del nuevo milenioThe objective of this article is to take on a critical reading of one of the numerous black novels written by Robert Bolaño (1953 - 2003. Of the critical bibliography about his work, The Ice Rink is perhaps one of less-worked texts; nevertheless, in his work a series of composition principles are contained that imply a reading of gender. They themselves anticipate readings keys that pulverize aspects that indicate, paradoxically, the necessity of their death to show the use of the black portrait. We could think that the ‘attack’ to the laws of this genre, made from within itself, experiences, through its characters and situations, not only the possibility of the existence of a corpse, but also of throwing it, and of throwing ourselves to the emptiness at the end of the century and at the beginning of the new millennium

  12. Atmospheric conditions at Cerro Armazones derived from astronomical data

    Science.gov (United States)

    Lakićević, Maša; Kimeswenger, Stefan; Noll, Stefan; Kausch, Wolfgang; Unterguggenberger, Stefanie; Kerber, Florian

    2016-04-01

    Aims: We studied the precipitable water vapour (PWV) content near Cerro Armazones and discuss the potential use of our technique of modelling the telluric absorbtion lines for the investigation of other molecular layers. The site is designated for the European Extremely Large Telescope (E-ELT) and the nearby planned site for the Čerenkov Telescope Array (CTA). Methods: Spectroscopic data from the Bochum Echelle Spectroscopic Observer (BESO) instrument were investigated by using a line-by-line radiative transfer model (LBLRTM) for the Earth's atmosphere with the telluric absorption correction tool molecfit. All observations from the archive in the period from December 2008 to the end of 2014 were investigated. The dataset completely covers the El Niño event registered in the period 2009-2010. Models of the 3D Global Data Assimilation System (GDAS) were used for further comparison. Moreover, we present a direct comparison for those days for which data from a similar study with VLT/X-Shooter and microwave radiometer LHATPRO at Cerro Paranal are available. Results: This analysis shows that the site has systematically lower PWV values, even after accounting for the decrease in PWV expected from the higher altitude of the site with respect to Cerro Paranal, using the average atmosphere found with radiosondes. We found that GDAS data are not a suitable basis for predicting local atmospheric conditions - they usually systematically overestimate the PWV values. The large sample furthermore enabled us to characterize the site with respect to symmetry across the sky and variation with the years and within the seasons. This technique of studying the atmospheric conditions is shown to be a promising step into a possible monitoring equipment for the CTA. Based on archival observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile and of the Cerro Armazones Observatory facilities of the Ruhr Universität Bochum.Full Table 1

  13. Biopolitics in Roberto Bolaño’s 2666, “The Part About the Crimes”

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    Camelia Raghinaru

    2016-05-01

    Full Text Available Starting from Agamben’s theories of state of exception, and sovereignty and subalternity, this article looks at Roberto Bolaño’s 2004 novel, 2666, as a critique of neoliberal capitalism, where the law is predicated on violence and exploitation of surplus humanity—in this case, the poor female maquiladora workers at the U.S./Mexico border. Narco-trafficking and misogyny are symptomatic of a juridical and economic order that revolves around exploitation as central to the workings of transnational capitalism. As the boundary between legality and illegality breaks down, an aporetic state of exception forms, in which the transnational corporation acts as sovereign power by introducing a space of exception in the law. This force of law without law obscures the politicization of bare life, while maintaining traditional means of exploitation. The maquiladora workers emerge as docile bodies imprinted by the biopolitical power of sovereign financial capital. Powerless victims of overwork, displacement, destitution, and ultimately rape and slaughter, they objectify the violence of low wage labour in the global exchange of power and capital.

  14. Connected magma plumbing system between Cerro Negro and El Hoyo Complex, Nicaragua revealed by gravity survey

    Science.gov (United States)

    MacQueen, Patricia; Zurek, Jeffrey; Williams-Jones, Glyn

    2016-11-01

    Cerro Negro, near León, Nicaragua is a young, relatively small basaltic cinder cone volcano that has been unusually active during its short lifespan. Multiple explosive eruptions have deposited significant amounts of ash on León and the surrounding rural communities. While a number of studies investigate the geochemistry and stress regime of the volcano, subsurface structures have only been studied by diffuse soil gas surveys. These studies have raised several questions as to the proper classification of Cerro Negro and its relation to neighboring volcanic features. To address these questions, we collected 119 gravity measurements around Cerro Negro volcano in an attempt to delineate deep structures at the volcano. The resulting complete Bouguer anomaly map revealed local positive gravity anomalies (wavelength 0.5 to 2 km, magnitude +4 mGal) and regional positive (10 km wavelength, magnitudes +10 and +8 mGal) and negative (12 and 6 km wavelength, magnitudes -18 and -13 mGal) Bouguer anomalies. Further analysis of these gravity data through inversion has revealed both local and regional density anomalies that we interpret as intrusive complexes at Cerro Negro and in the Nicaraguan Volcanic Arc. The local density anomalies at Cerro Negro have a density of 2700 kg m-3 (basalt) and are located between -250 and -2000 m above sea level. The distribution of recovered density anomalies suggests that eruptions at Cerro Negro may be tapping an interconnected magma plumbing system beneath El Hoyo, Cerro La Mula, and Cerro Negro, and more than seven other proximal volcanic features, implying that Cerro Negro should be considered the newest cone of a Cerro Negro-El Hoyo volcanic complex.

  15. Exploration and development of the Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Lippmann, M.J.; Goldstein, N.E.; Halfman, S.E.; Witherspoon, P.A.

    1983-07-01

    A multidisciplinary effort to locate, delineate, and characterize the geothermal system at Cerro Prieto, Baja California, Mexico, began about 25 years ago. It led to the identification of an important high-temperature, liquid-dominated geothermal system which went into production in 1973. Initially, the effort was undertaken principally by the Mexican electric power agency, the Comision Federal de Electricidad (CFE). Starting in 1977 a group of US organizations sponsored by the US Department of Energy, joined CFE in this endeavor. An evaluation of the different studies carried out at Cerro Prieto has shown that: (1) surface electrical resistivity and seismic reflection surveys are useful in defining targets for exploratory drilling; (2) the mineralogical studies of cores and cuttings and the analysis of well logs are important in designing the completion of wells, identifying geological controls on fluid movement, determining thermal effects and inferring the thermal history of the field; (3) geochemical surveys help to define zones of recharge and paths of fluid migration; and (4) reservoir engineering studies are necessary in establishing the characteristics of the reservoir and in predicting its response to fluid production.

  16. Precision gravity studies at Cerro Prieto: a progress report

    Energy Technology Data Exchange (ETDEWEB)

    Grannell, R.B. (California State Univ., Long Beach); Kroll, R.C.; Wyman, R.M.; Aronstam, P.S.

    1981-01-01

    A third and fourth year of precision gravity data collection and reduction have now been completed at the Cerro Prieto geothermal field. In summary, 66 permanently monumented stations were occupied between December and April of 1979 to 1980 and 1980 to 1981 by a LaCoste and Romberg gravity meter (G300) at least twice, with a minimum of four replicate values obtained each time. Station 20 alternate, a stable base located on Cerro Prieto volcano, was used as the reference base for the third year and all the stations were tied to this base, using four to five hour loops. The field data were reduced to observed gravity values by (1) multiplication with the appropriate calibration factor; (2) removal of calculated tidal effects; (3) calculation of average values at each station, and (4) linear removal of accumulated instrumental drift which remained after carrying out the first three reductions. Following the reduction of values and calculation of gravity differences between individual stations and the base stations, standard deviations were calculated for the averaged occupation values (two to three per station). In addition, pooled variance calculations were carried out to estimate precision for the surveys as a whole.

  17. Hydrocarbons emissions from Cerro Prieto Geothermal Power Plant, Mexico

    Science.gov (United States)

    Navarro, Karina; Navarro-González, Rafael; de la Rosa, José; Peralta, Oscar; Castro, Telma; Imaz, Mireya

    2014-05-01

    One of the most important environmental issues related to the use of geothermal fluids to generate electricity is the emission of non-condensable gases to the atmosphere. Mexico has one of the largest geothermal plants in the world. The facility is located at Cerro Prieto, Baja California, roughly 30 km south of Mexicali and the international boundary between Mexico and United States. The Cerro Prieto power plant has 13 units grouped on four individual powerhouses. Gas samples from 9 units of the four powerhouses were collected during 4 campaigns conducted in May-July, 2010, February, 2012, December, 2012, and May, 2013. Gas samples from the stacks were collected in 1000 ml Pyrex round flasks with Teflon stopcocks, and analyzed by gas chromatography-mass spectrometry. Methane was the most abundant aliphatic hydrocarbon, with a concentration that ranged from less than 1% up to 3.5% of the total gas mixture. Normal alkanes represented the second most abundant species, and displayed a decreasing abundance with increasing carbon number in the homologous series. Isoalkanes were also present as isobutane and isopentane. Cycloalkanes occurring as cyclopentane and cyclohexane, were detected only at trace level. Unsaturated hydrocarbons (alkenes and alkynes) were not detected. Benzene was detected at levels ranging from less than 1% up to 3.4% of the total gas mixture. Other aromatic hydrocarbons detected were toluene, and xylenes, and were present at lower concentrations (

  18. Characterization of pottery from Cerro de Las Ventanas, Zacatecas, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Lopez-del-Rio, H.; Mireles-Garcia, F. [Unidad Academica de Estudios Nucleares, UAZ, Zacatecas (Mexico); Mendez-Cardona, R.Y. [Unidad Academica de Antropologia, UAZ, Zacatecas (Mexico); Nicolas-Caretta, M. [INAH Delegacion Zacatecas (Mexico); Coordinacion de Ciencias Sociales y Humanidades, UASLP, Fracc. Talleres, SLP (Mexico); Speakman, R.J. [Museum Conservation Inst., Smithsonian Institution, Suitland, MD (United States); Glascock, M.D. [Research Reactor Center, Univ. of Missouri, Columbia, MO (United States)

    2009-09-15

    With the aim of classifying prehispanic pottery from Cerro de Las Ventanas site, Juchipila, Zacatecas, Mexico, instrumental neutron activation analysis (INAA) was used to analyze ceramic samples at the University of Missouri Research Reactor Center. Thirty-two chemical elements were measured: Al, As, Ba, Ca, Ce, Co, Cr, Cs, Dy, Eu, Fe, Hf, K, La, Lu, Mn, Na, Nd, Rb, Sb, Sc, Sm, Sr, Ta, Tb, Ti, Th, U, V, Yb, Zn, and Zr. Two multivariate statistical methods, cluster analysis and principal component analysis, were performed on the dataset to examine similarities between samples and to establish compositional groups. The statistical analyses of the dataset suggest that the pottery samples form a unique chemically homogeneous group, with the exception of one pottery sample. The compositional data were compared to an existing Mesoamerican ceramic database. It was found that the newly generated data fit best with data from a previous chemical analysis of pottery from the Malpaso Valley. However, despite the apparent similarity, pottery samples from the site of Cerro de Las Ventanas represent a new and unique chemical fingerprint in the region. (orig.)

  19. Scarsa visibilità in provincia. Nebbia laboratorio di cambiamento

    Directory of Open Access Journals (Sweden)

    Sebastiano Citroni

    2016-09-01

    Full Text Available Raramente oggetto d’attenzione esplicita, la categoria di provincia organizza implicitamente svariati discorsi e connota gli oggetti più vari da un punto di vista geografico, sociale e talvolta esistenziale. Recentemente, ad esempio, la provincia è stata una delle dimensioni centrali nei commenti sul voto in Gran Bretagna per la ‘Brexit’ e nelle analisi sull’ascesa di Donald Trump negli Stati Uniti. In entrambi i casi, infatti, è invocata una più adeguata comprensione dei territori di provincia di cui tali fenomeni sarebbero espressione.

  20. Bocio en la provincia de Cartago

    Directory of Open Access Journals (Sweden)

    María Dolores Fernández-Olaechea

    2001-03-01

    Full Text Available Justificación y Objetivo: La yodazión de la sal en Costa Rica, establecida en 1972, hizo que el bocio por deficiencia de yodo disminuyera en forma importante. Sin embargo, las notificaciones por bocio en todo el país han aumentado en los últimos años, siendo Cartago una de las provincias más afectadas. En el año 1994 la mitad de los casos de bocio en todo el país provenían de dicha provincia. La presente investigación trata de analizar esta elevada incidencia de bocios provenientes de la zona de Cartago. Métodos: Se analizó una muestra significativa de los casos de bocio reportados en la provincia durante el año 1996. Se eligió dicho año porque eran los últimos datos estadísticos que tenía el Ministerio de Salud en ese momento. A todos los pacientes se les tomó la historia del bocio y se les hizo examen físico. Además se les midió en sangre los niveles de honnona estimulante del tiroides (TSH, tiroxina (T4, anticuerpos antitiroideos y antimicrosomas. También se midió de la excreción urinaria de yodo y se analizó el contenido de yodo en las muestras de sal que los pacientes trajeron de sus hogares. Resultados y Conclusión: El 96% de los pacientes con bocio eran del sexo femenino, la mayoría de edad media y dedicadas a las labores del hogar. Un 68% de los bocios eran pequeños y 72% de crecimiento difuso. En el 24,5% de los casos el bocio se acompañaba de hipotiroidismo. La excreción urinaria actual de yodo se encontró disminuida en un 29% de pacientes. El 91 % de las muestras de sal resultó adecuadamente yodada. Sin embargo se descubrió una sustitución en el uso de la misma por otros condimentos elaborados con sal no yodada.

  1. Cytosolic BolA Plays a Repressive Role in the Tolerance against Excess Iron and MV-Induced Oxidative Stress in Plants.

    Directory of Open Access Journals (Sweden)

    Lu Qin

    Full Text Available The BolA-like protein is present in all eukaryotes, and it is able to form complex with monothiol glutaredoxin of the same subcellular compartments, suggesting that the BolA-like protein has essential function in eukaryotes, and that the function is associated with its partner glutaredoxin. Some studies have indicated a role for BolA proteins in Fe-S cluster synthesis or in redox homeostasis. However, the physiological function of BolA proteins remains to be elucidated. Here, we report the characterization of an insertion mutant of BolA3 in Arabidopsis. Among the four AtBolA proteins found in Arabidopsis, the AtBolA3 was the only BolA located in the cytosol of plant cells. It was highly expressed in roots. AtBolA3 was able to interact with the cytosolic monothiol glutaredoxin, AtGRXS17. The bola3 mutant did not show any notable phenotype under normal growth condition, but rather grew better than wild type under some stresses. The bola3 mutant was more tolerant to excess iron and the MV-induced oxidative stress than wild type. It displayed no necrosis in leaves, developed longer roots, accumulated more iron and higher Fe-S protein activities in roots. In addition, the mutant possessed a more potent antioxidant defense to scavenge ROS species. Taken together, our data indicated that the cytosolic AtBolA3 has a suppressive role in the tolerance to excess iron and the MV-induced oxidative stress in plants. AtBolA3 seems to be a repressor under some stress conditions.

  2. Cytosolic BolA Plays a Repressive Role in the Tolerance against Excess Iron and MV-Induced Oxidative Stress in Plants.

    Science.gov (United States)

    Qin, Lu; Wang, Meihuan; Zuo, Jia; Feng, Xiangyang; Liang, Xuejiao; Wu, Zhigeng; Ye, Hong

    2015-01-01

    The BolA-like protein is present in all eukaryotes, and it is able to form complex with monothiol glutaredoxin of the same subcellular compartments, suggesting that the BolA-like protein has essential function in eukaryotes, and that the function is associated with its partner glutaredoxin. Some studies have indicated a role for BolA proteins in Fe-S cluster synthesis or in redox homeostasis. However, the physiological function of BolA proteins remains to be elucidated. Here, we report the characterization of an insertion mutant of BolA3 in Arabidopsis. Among the four AtBolA proteins found in Arabidopsis, the AtBolA3 was the only BolA located in the cytosol of plant cells. It was highly expressed in roots. AtBolA3 was able to interact with the cytosolic monothiol glutaredoxin, AtGRXS17. The bola3 mutant did not show any notable phenotype under normal growth condition, but rather grew better than wild type under some stresses. The bola3 mutant was more tolerant to excess iron and the MV-induced oxidative stress than wild type. It displayed no necrosis in leaves, developed longer roots, accumulated more iron and higher Fe-S protein activities in roots. In addition, the mutant possessed a more potent antioxidant defense to scavenge ROS species. Taken together, our data indicated that the cytosolic AtBolA3 has a suppressive role in the tolerance to excess iron and the MV-induced oxidative stress in plants. AtBolA3 seems to be a repressor under some stress conditions.

  3. Poéticas de lo indecidible: Roberto Bolaño y la re-narración post-dictatorial

    Directory of Open Access Journals (Sweden)

    Eugenio Santangelo

    2013-01-01

    Full Text Available This paper examines Roberto Bolaño's rewriting of his own short story "Ramírez Hoffman, el infame" in the novel Estrella distante. It considers the re-narration of historical catastrophes as an ethical and political scheme, exploring Bolaño's poetics of narrative pluralization, as well as his ethics of reading as a critical experience. Following Idelber Avelar's theories on postdictatorial fiction, the paper highlights the author's effort to impede the resolution of the mourning process, opposing the politics of memory of the so-called Latin American democratic transition.

  4. A review of progress in understanding the fluid geochemistry of the Cerro Prieto geothermal system

    Science.gov (United States)

    Truesdell, A.H.; Nehring, N.L.; Thompson, J.M.; Janik, C.J.; Coplen, T.B.

    1984-01-01

    Fluid geochemistry has played a major role in our present understanding of the Cerro Prieto geothermal system. Fluid chemical and isotopic compositions have been used to indicate the origin of water, salts and gases, original subsurface temperature and fluid flow, fluid-production mechanisms, and production-induced aquifer boiling and cold-water entry. The extensive geochemical data and interpretations for Cerro Prieto published from 1964 to 1981 are reviewed and discussed. Fluid geochemistry must continue to play an important role in the further development of the Cerro Prieto field. ?? 1984.

  5. Progress on the biphase turbine at Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Cerini, D.; Hays, L.; Studhalter, W. [Douglas Energy Company, Placentia, CA (United States)

    1997-12-31

    The status of a Biphase turbine power plant being installed at the Cerro Prieto geothermal field is presented. The major modules for the power plant are completed except for a back pressure steam turbine. The power plant will be started in April 1997 with the Biphase turbine alone followed by the addition of the steam turbine module two months later. The current power plant performance level is 2780 kWe due to a decline in the well. An increase in power output to 4060 kWe by adding the flow from another well is planned. The addition of five Biphase power plants with a total power output of 21.2 megawatts is described.

  6. Geochemical evidence of drawdown in the Cerro Prieto geothermal field

    Science.gov (United States)

    Truesdell, A.H.; Manon, M.A.; Jimenez, S.M.E.; Sanchez, A.A.; Fausto, L.J.J.

    1979-01-01

    Some wells of the Cerro Prieto geothermal field have undergone changes in the chemistry of fluids produced which reflect reservoir processes. Pressure decreases due to production in the southeastern part of the field have produced both drawdown of lower chloride fluids from an overlying aquifer and boiling in the aquifer with excess steam reaching the wells. These reservoir changes are indicated by changes in fluid chloride concentrations, Na/K ratios and measured enthalpies and by comparisons of aquifer fluid temperatures and chloride concentrations calculated from enthalpy and chemical measurements. Fluid temperatures have not been greatly affected by this drawdown because heat contained in the rock was transferred to the fluid. When this heat is exhausted, fluid temperatures may drop rapidly. ?? 1979.

  7. The origin of the Cerro Prieto geothermal brine

    Science.gov (United States)

    Truesdell, A.H.; Thompson, J.M.; Coplen, T.B.; Nehring, N.L.; Janik, C.J.

    1981-01-01

    The Cerro Prieto geothermal brine may have originated from mixing of Colorado River water with seawater evaporated to about six times its normal salinity. This mixture circulated deeply and was heated by magmatic processes. During deep circulation, Li, K, Ca, B, SiO2 and rare alkalis were transferred from rock minerals to the water, and Mg, SO4, and a minor quantity of Na were transferred to the rock. Similar alteration of seawater salt chemistry has been observed in coastal geothermal systems and produced in laboratory experiments. After heating and alteration the brine was further diluted to its present range of composition. Oxygen isotopes in the fluid are in equilibrium with reservoir calcite and have been affected by exploitation-induced boiling and dilution. ?? 1981.

  8. Reservoir engineering studies of the Cerro Prieto geothermal field

    Science.gov (United States)

    Goyal, K. P.; Lippmann, M. J.; Tsang, C. F.

    1982-09-01

    Reservoir engineering studies of the Cerro Prieto geothermal field began in 1978 under a five-year cooperative agreement between the US Department of Energy and the Comision Federal de Electricidad de Mexico, with the ultimate objective of simulating the reservoir to forecast its production capacity, energy longevity, and recharge capability under various production and injection scenarios. During the fiscal year 1981, attempts were made to collect information on the evolution history of the field since exploitation began; the information is to be used later to validate the reservoir model. To this end, wellhead production data were analyzed for heat and mass flow and also for changes in reservoir pressures, temperatures, and saturations for the period from March 1973 to November 1980.

  9. Geothermal emissions data base: Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Schwartz, S.R. (comp.)

    1978-04-01

    A new database subset on the gaseous emissions from the Cerro Prieto geothermal field is presented. Properties and states of the reservoir fluid such as flow rates, wellhead pressure, and enthalpy are included in the file along with the well name and constituent measurement. This subset is the result of an initial screening of the data covering 1967 to 1969, and new additions will be appended periodically to the file. The data are accessed by a database management system as are all other subsets in the file. Thereby, one may search the database for specific data requirements and print selective output. For example, one may wish to locate reservoir conditions for cases only when the level of the constituent exceeded a designated value. Data output is available in the form of numerical compilations such as the attached, or graphical displays disposed to paper, film, or magnetic tape.

  10. Results from two years of resistivity monitoring at Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Wilt, M.J.; Goldstein, N.E.

    1981-01-01

    Dipole-dipole resistivity measurements for the combined purposes of reservoir delineation and resistivity monitoring were first made at Cerro Prieto in 1978 and have continued on an annual basis since then. Two 20 km long dipole-dipole lines with permanently emplaced electrodes at one kilometer spacings were established over the field area; one of these lines is remeasured annually. Resistivity measurements are taken using a 25 kW generator capable of up to 80A output and a microprocessor controlled signal averaging receiver; this high power-low noise system is capable of highly accurate measurements even at large transmitter-receiver separations. Standard error calculations for collected data indicate errors less than 5% for all points, but 95% confidence intervals show error limits about 2 to 4 times higher. Analysis of collected data indicate little change in the apparent resistivity of the upper 300 m over the field production zone and that in this section measurements are relatively insensitive to the annual rainfall cycle. Apparent resistivity increases were observed over the older producing zone at Cerro Prieto at depths of 1 km and greater. Large zones of decreasing apparent resistivity were observed flanking the zone of increases on both sides. The increase in apparent resistivity in the production region may be due to an increasing fraction of steam in the reservoir resulting from a production related decline in reservoir pressure. Alternatively the increases may be the result of fresh water influx from the Colorado River. The zone of declining resistivity flanking the area of increase may be due to the movement of saline waters into the reservoir region as a result of the pressure decline. Quantitative modeling of observed changes is impractical owing to the high uncertainty in estimating apparent resistivity changes and the nonuniqueness of models.

  11. LOS TEXTILES RECUPERADOS EN LA CULTURA BOLAÑOS, JALISCO (Textiles recovered from the Bolaños culture, Jalisco

    Directory of Open Access Journals (Sweden)

    María Teresa Cabrero G.

    2010-09-01

    Full Text Available En el México prehispánico, el hallazgo de textiles es sorprendente ya que deben reunirse determinados factores de clima y suelo para su conservación. Durante las excavaciones en El Piñón, sitio arqueológico perteneciente a la cultura Bolaños situada en el norte de Jalisco, México, se descubrieron varios fragmentos de telas elaboradas con fibras de algodón cuya antigüedad es de 1500 años. Dar a conocer este hallazgo resulta de gran importancia por ser una región inhóspita, poco conocida y alejada de las grandes urbes mexicanas. ENGLISH: It is very uncommon to find textile remains dated before the Spanish conquerors arrived in Mexico because numerous taphonomic factors, especially those pertaining to local climatic and soil chemistry conditions, must coincide to in order to preserve textiles. We found a series of cotton cloth fragments dated about 1500 years old during the archaeological recovery at the site of El Piñon, which is part of the Bolaños culture located in the North of Jalisco, Mexico. Publishing these data is very important due to the inhospitable geography and climate of the region, the fact that the site is not well known and is at a substantial distance from the closest Mexican urban centers.

  12. La pedagogía de las parábolas: Una perspectiva psicológica

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    Luis Bravo

    2002-01-01

    Full Text Available El presente artículo analiza, desde la perspectiva de la psicología cognitiva, el método pedagógico de la enseñanza con parábolas, efectuado por Jesús de Nazaret. Este método de enseñanza se caracteriza por su efectividad para dejar en la memoria colectiva un contenidoque se ha retrasmitido a través de los siglos. En las parábolas hay significados que pueden descubirse tras sus apariencias de ser historias sencillas y a veces dramatizadas, con características de imágenes visuales descritas verbalmente, que hacen fácil su retrasmisiónJesus of Nazareth’s pedagogical method of teaching in parabolas is analized from the point of view of the cognitive psychology. This teaching method has showed its effectivity for imprinting in the collective memory images and meanings that has been transmited during centuries. Inside the visual histories and dramatizations of the parabolas there are meanings that people may discover and talk with others easily

  13. EFFECTS OF LOCALIZED AQUIFER BOILING ON FLUID PRODUCTION AT CERRO PRIETO.

    Science.gov (United States)

    Truesdell, Alfred H.; D'Amore, Franco; Nieva, David

    1984-01-01

    Localized aquifer boiling in the shallow two-phase reservoir of Cerro Prieto has produced excess steam and increased electrical output. Unfortunately it has also caused near-well mineral deposition that has decreased permeability and fluid flow. Inflow of cold water has limited the extent of aquifer boiling and permeability loss. The deeper reservoir at Cerro Prieto may need injection of cold water to decrease boiling and prevent loss of production. Refs.

  14. Bocio en la provincia de Cartago

    Directory of Open Access Journals (Sweden)

    María Dolores Fernández-Olaechea

    2001-03-01

    Full Text Available Justificación y Objetivo: La yodazión de la sal en Costa Rica, establecida en 1972, hizo que el bocio por deficiencia de yodo disminuyera en forma importante. Sin embargo, las notificaciones por bocio en todo el país han aumentado en los últimos años, siendo Cartago una de las provincias más afectadas. En el año 1994 la mitad de los casos de bocio en todo el país provenían de dicha provincia. La presente investigación trata de analizar esta elevada incidencia de bocios provenientes de la zona de Cartago. Métodos: Se analizó una muestra significativa de los casos de bocio reportados en la provincia durante el año 1996. Se eligió dicho año porque eran los últimos datos estadísticos que tenía el Ministerio de Salud en ese momento. A todos los pacientes se les tomó la historia del bocio y se les hizo examen físico. Además se les midió en sangre los niveles de honnona estimulante del tiroides (TSH, tiroxina (T4, anticuerpos antitiroideos y antimicrosomas. También se midió de la excreción urinaria de yodo y se analizó el contenido de yodo en las muestras de sal que los pacientes trajeron de sus hogares. Resultados y Conclusión: El 96% de los pacientes con bocio eran del sexo femenino, la mayoría de edad media y dedicadas a las labores del hogar. Un 68% de los bocios eran pequeños y 72% de crecimiento difuso. En el 24,5% de los casos el bocio se acompañaba de hipotiroidismo. La excreción urinaria actual de yodo se encontró disminuida en un 29% de pacientes. El 91 % de las muestras de sal resultó adecuadamente yodada. Sin embargo se descubrió una sustitución en el uso de la misma por otros condimentos elaborados con sal no yodada.Justification and Objectives: In Costa Rica the iodination of salt, established in 1972, reduced the incidence of endemic goitre. Nonetheless goiter notifications were increased during the last years. The purpose of this study is to determine the causes of the high incidence of goiter in

  15. Relación entre la potencia muscular de extremidades inferiores y tronco con la velocidad de salida de la bola en el swing de drive en golf

    Directory of Open Access Journals (Sweden)

    Lorena Torres Ronda

    2010-09-01

    Full Text Available A pesar del interés emergente en el acondicionamiento físico en el golf, se han llevado a cabo pocos estudios para valorar la relación entre la potencia mecánica y el rendimiento en golf. El objetivo de este estudio fue valorar si existía una correlación entre la velocidad de salida de la bola del swing de drive y la potencia muscular de extremidades inferiores y tronco, en un grupo de 8 golfistas (16,8 ± 1,4 años; 2,2 ± 1,8 Handicap; 63,1 ± 6,4 kg.; 172,7 ± 7,5 cm. El test incluyó mediciones de la velocidad de salida de la bola y tests de potencia mecánica (prensa de piernas horizontal, press de banca y rotaciones de tronco. Los resultados de este estudio indican que existe una correlación significativa entre la velocidad de salida de la bola y la potencia piernas (prensa de piernas horizontal: r2=,933; p=,000 y del tronco (press de banca: r2 = 0,66; p = ,014. La prensa de piernas se mostró como el predictor más representativo para la velocidad de salida de la bola (r2 = 0,934; p = ,000.

  16. Chistes par(ra reordenar el canon: Roberto Bolaño, Nicanor Parra y la poesía chilena

    Directory of Open Access Journals (Sweden)

    Benjamin Loy

    2014-12-01

    Full Text Available “Todo se lo debo a Parra” – con estas y semejantes palabras de elogio Roberto Bolaño le asignó un lugar central al antipoeta chileno dentro de su amplio canon personal. No obstante, la amplia crítica bolañiana hasta el momento no pareciera haber estudiado a fondo las múltiples dimensiones de esta relación entre los dos autores chilenos. El presente estudio pretende analizar, por lo tanto, de qué manera los postulados ético-estéticos de Parra y de su antipoesía le sirven a Bolaño como punto de referencia clave para reordenar el canon de la literatura chilena contemporánea. Además, se discutirá el papel clave que desempeña Bolaño en el renovado interés de la crítica en la obra de Nicanor Parra durante los últimos años.

  17. Geochemistry of igneous rocks from the Cerro Prieto geothermal field, northern Baja California, Mexico

    Science.gov (United States)

    Herzig, C. T.

    1990-08-01

    Fractional crystallization of basaltic magma, derived from an oceanic affinity source region present beneath the Salton Trough and emplaced into a pull-apart basin of this continental rift regime, produced a tholeiitic suite of hypabyssal rocks consisting of basalt, andesite and dacite within the Cerro Prieto geothermal field, located in northern Baja California, Mexico. Higher light-rare-earth-element abundances for a basalt from the Cerro Prieto geothermal field in comparison to basalts from the Gulf of California and the East Pacific Rise suggest partial assimilation of crustal materials into the parental magmas generated beneath the Salton Trough. The crustal contaminant may be present near the surface today in the form of granitoids of the Peninsular Ranges batholith, at deeper levels as hydrothermally altered materials near the base of the Salton Trough, or may be a relict feature of Tertiary subduction contained within the upper mantle beneath the Salton Trough. The Sr isotopic compositions of dacites from the nearby Cerro Prieto volcano range from 0.7029 to 0.7036, indicating an oceanic affinity source for these rocks. The suite of hypabyssal rocks of tholeiitic affinity present within the Cerro Prieto geothermal field, related by fractional crystallization, link the dacite volcano of Cerro Prieto to gabbroic plutons inferred to exist beneath the Cerro Prieto geothermal field.

  18. Association of bovine leukocyte antigen (BoLA) DRB3.2 with immune response, mastitis, and production and type traits in Canadian Holsteins.

    Science.gov (United States)

    Rupp, R; Hernandez, A; Mallard, B A

    2007-02-01

    Data collected from 328 Canadian Holsteins in a research herd at the University of Guelph were used to study associations among expression of bovine leukocyte antigen (BoLA) DRB3.2 alleles, immune response, mastitis resistance via somatic cell counts (SCC), and clinical mastitis, as well as to extend these results to production and type traits. Accordingly, groups of cows were evaluated in vivo for both the antibody-mediated immune response (AMIR) and the cell-mediated immune response (CMIR), which generally predominate in responses to extracellular and intracellular pathogens, respectively. Of note was that associations between BoLA DRB3.2 alleles and immune responses tended to be in the opposite sign for the 2 AMIR and CMIR traits examined. For example, alleles DRB3.2*3 and *24 were associated with higher AMIR but lower CMIR, whereas allele *22 was associated with lower AMIR but higher CMIR. This finding is in agreement with the hypothesis that both traits are genetically independent and represent opposing type 1 and type 2 immune responses. Additionally, BoLA DRB3.2*3 and *11 were associated with lower SCC, whereas alleles *22 and *23 were associated with higher SCC. Finally, allele DRB3.2*3 was also associated with less clinical mastitis, whereas allele *8 was associated with higher mastitis risk. Allele *3 was of particular relevance because it was associated with increased antibodies, as well as reduced mastitis and SCC. This could be due to an indirect relationship between the ability to produce a high antibody response and enhanced defense against intrammamary infections caused by extracellular pathogens. Consequently, the BoLA DRB3.2*3 allele should be investigated further as a candidate for resistance to some types of intramammary infections, the important caveat being its association with lower CMIR, particularly with one of the test antigens used to evaluate delayed-type hypersensitivity. The results of associations between BoLA DRB3.2 and production

  19. Evidence of recent deep magmatic activity at Cerro Bravo-Cerro Machín volcanic complex, central Colombia. Implications for future volcanic activity at Nevado del Ruiz, Cerro Machín and other volcanoes

    Science.gov (United States)

    Londono, John Makario

    2016-09-01

    In the last nine years (2007-2015), the Cerro Bravo-Cerro Machín volcanic complex (CBCMVC), located in central Colombia, has experienced many changes in volcanic activity. In particular at Nevado del Ruiz volcano (NRV), Cerro Machin volcano (CMV) and Cerro Bravo (CBV) volcano. The recent activity of NRV, as well as increasing seismic activity at other volcanic centers of the CBCMVC, were preceded by notable changes in various geophysical and geochemical parameters, that suggests renewed magmatic activity is occurring at the volcanic complex. The onset of this activity started with seismicity located west of the volcanic complex, followed by seismicity at CBV and CMV. Later in 2010, strong seismicity was observed at NRV, with two small eruptions in 2012. After that, seismicity has been observed intermittently at other volcanic centers such as Santa Isabel, Cerro España, Paramillo de Santa Rosa, Quindío and Tolima volcanoes, which persists until today. Local deformation was observed from 2007 at NRV, followed by possible regional deformation at various volcanic centers between 2011 and 2013. In 2008, an increase in CO2 and Radon in soil was observed at CBV, followed by a change in helium isotopes at CMV between 2009 and 2011. Moreover, SO2 showed an increase from 2010 at NRV, with values remaining high until the present. These observations suggest that renewed magmatic activity is currently occurring at CBCMVC. NRV shows changes in its activity that may be related to this new magmatic activity. NRV is currently exhibiting the most activity of any volcano in the CBCMVC, which may be due to it being the only open volcanic system at this time. This suggests that over the coming years, there is a high probability of new unrest or an increase in volcanic activity of other volcanoes of the CBCMVC.

  20. Hydrogeophysics and Water Balance of Cerro Prieto Dam, NE Mexico

    Science.gov (United States)

    Yutsis, V.; de León Gómez, H.; Masuch Oesterreich, D.; Izaguirre, F.

    2007-05-01

    The geographical location of the State of Nuevo Leon, due to its physiographic features, has temperate and arid climate; undeveloped drainage, low precipitations, and high evapotranspiration rates, as well as rapid demographic growth. The hydrological data of the Pablillo basin, registered in the hydrometric station Cerro Prieto, showed an annual precipitation from 415 up to 1130 mm/a , the mean evaporation of 705 mm/a (up to 2460 mm/a in 1996). The maximum water storage of the Cerro Prieto reservoir is 395 millions m3 which corresponds to a water level of 295 meters. However, this level was reached only three times after the dam's construction. By the end of June 2006 the water level was at 276.2 m which corresponds to a water volume of about 127,806,300 m3 which is less than a third of maximum storage. Analysis of hydrological data showed sufficient misbalance between water recharge (by rain, river flow) and loss due to evaporation, filtration, extraction, discharge, etc. 160 gravity reading points, 400 onshore magnetic field readings as well as about 250 offshore magnetic points were carried out. The standard corrections as instrumental drift, latitude, elevation, IGRF, etc. were applied to obtained data. Data procession includes Fourier transformation, wavelength filters, upward continuation, vertical and horizontal derivates, etc. As a result a 2D geological-geophysical models and 3D maps were elaborated. The general trend of the magnetic field reduced to a pole is NW - SE on which background anomalies of northeast trend are obviously traced. The general trend of the gravity field received as a result of our works is the same. However, local magnetic and residual gravity anomalies have mosaic character and, being morphologically extended in a NE direction, grouped in chains of northwest trend. Potential data interpretation allows assuming a series of the superficial fractures focused in a NE direction, perpendicular (NW-SE) to the general deep fault. The

  1. Investigating the subsurface connection beneath Cerro Negro volcano and the El Hoyo Complex, Nicaragua

    Science.gov (United States)

    Venugopal, Swetha; Moune, Séverine; Williams-Jones, Glyn

    2016-10-01

    Cerro Negro, the youngest volcano along the Central American Volcanic Belt (CAVB), is a polygenetic cinder cone with relatively frequent basaltic eruptions. The neighbouring El Hoyo complex, of which Las Pilas is the dominant edifice, is a much larger and older complex with milder and less frequent eruptions. Previous studies have suggested a deep link beneath these two closely spaced volcanoes (McKnight, 1995; MacQueen, 2013). Melt inclusions were collected from various tephra samples in order to determine whether a connection exists and to delineate the features of this link. Major, volatile, and trace elemental compositions reveal a distinct geochemical continuum with Cerro Negro defining the primitive endmember and El Hoyo representing the evolved endmember. Magmatic conditions at the time of melt inclusion entrapment were estimated with major and volatile contents: 2.4 kbar and 1170 °C for Cerro Negro melts and 1.3 kbar and 1130 °C for El Hoyo melts with an overall oxygen fugacity at the NNO buffer. Trace element contents are distinct and suggest Cerro Negro magmas fractionally crystallise while El Hoyo magmas are a mix between primitive Cerro Negro melts and residual and evolved El Hoyo magma. Modelling of end member compositions with alphaMELTS confirms the unique nature of El Hoyo magmas as resulting from incremental mixing between Cerro Negro and residual evolved magma at 4 km depth. Combining all available literature data, this study presents a model of the interconnected subsurface plumbing system. This model considers the modern day analogue of the Lemptégy cinder cones in Massif Central, France and incorporates structurally controlled dykes. The main implications of this study are the classification of Cerro Negro as the newest conduit within the El Hoyo Complex as well as the potential re-activation of the El Hoyo edifice.

  2. Detailed microearthquake studies at the Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Majer, E.L. (Lawrence Berkeley Lab., CA); McEvilly, T.V.

    1981-01-01

    There appears to be an increase in seismic activity within the Cerro Prieto production zone since early 1978. The microearthquake activity is now more or less constant at a rate of 2 to 3 events per day. The b-values within the field are significantly higher inside the production zone than are those for events on faults outside of the production region. The earthquakes seem to be controlled by the Hidalgo fault, although slight clustering was observed in the center of the main production region. The earthquakes within the production zone may reflect the reservoir dynamics associated with heat and mass withdrawal. Mechanisms such as volume change, thermal stresses and weakening of materials associated with boiling (i.e., phase changes, dissolution) may all be responsible for the increased seismic activity. Although a small reinjection program has started, the pressure drawdown conditions existing within the field would imply that increased pore pressure resulting from the injection activities is not responsible for the increased seismic activity.

  3. Evolution of the Cerro Prieto reservoirs under exploitation

    Energy Technology Data Exchange (ETDEWEB)

    Truesdell, A.H.; Lippmann, M.J. [Lawrence Berkeley National Lab., CA (United States); Puente, H.G. [Comision Federal de Electricidad, Mexicali (Mexico)

    1997-07-01

    The Cerro Prieto Geothermal field of Baja California (Mexico) has been under commercial production to generate electricity since 1973. Over the years, the large amount of Geothermal fluids extracted (at present about 12,000 tons per hour) to supply steam to the power plants has resulted in a reduction of pressures, changes in reservoir processes, and increased flow of cooler groundwater into the geothermal system. The groundwater recharging the reservoir moves horizontally through permeable layers, as well as vertically through permeable fault zones. In addition, the supply of deep hot waters has continued unabated, and perhaps has increased as reservoir pressure decreased. Since 1989, this natural fluid recharge has been supplemented by injection which presently amounts to about 20% of the fluid produced. Changes in the chemical and physical characteristics of the reservoir fluids due to the drop in pressures and the inflow of cooler groundwaters and injectate have been detected on the basis of wellhead data. These changes point to reservoir processes like local boiling, phase segregation, steam condensation, mixing and dilution. Finally, the study identified areas where fluids are entering the reservoir, as well as indicated their source (i.e. natural Groundwater recharge versus injectate) and established the controlling geologic structures.

  4. Cerro Prieto cold water injection: effects on nearby production wells

    Energy Technology Data Exchange (ETDEWEB)

    Truesdell, A.H.; Lippmann, M.J.; De Leon, J.; Rodriguez, M.H.

    1999-07-01

    The liquid-dominated Cerro Prieto geothermal field of northern Baja California, Mexico has been under commercial exploitation since 1973. During the early years of operation, all waste brines were sent to an evaporation pond built west of the production area. In 1989, cooled pond brines began to be successfully injected into the reservoir along the western boundary of the geothermal system. The injection rate varied over the years, and is at present about 20% of the total fluid extracted. As expected under the continental desert conditions prevailing in the area, the temperature and salinity of the pond brines change with the seasons, being higher during the summer and lower during the winter. The chemistry of pond brines is also affected by precipitation of silica, oxidation of H{sub 2}S and reaction with airborne clays. Several production wells in the western part of the field (CP-I area) showed beneficial effects from injection. The chemical (chloride, isotopic) and physical (enthalpy, flow rate) changes observed in producers close to the injectors are reviewed. Some wells showed steam flow increases, in others steam flow decline rates flattened. Because of their higher density, injected brines migrated downward in the reservoir and showed up in deep wells.

  5. What lies beneath the Cerro Prieto geothermal field?

    Energy Technology Data Exchange (ETDEWEB)

    Elders, W.A.; Williams, A.E.; Biehler, S. [Univ. of California, Riverside, CA (United States)

    1997-12-31

    Although the Cerro Prieto geothermal reservoir is one of the world`s largest geothermal developments, conflicting ideas persist about the basement beneath it. The current plan to drill a 6 km deep exploratory well in the eastern part of the field has brought this controversy into sharper focus. This paper discusses criteria which any model of what lies beneath the reservoir must meet, in terms of regional tectonics and geophysics, of the metamorphic and igneous rocks thus far encountered in drilling, and of models of possible heat sources and coupling between the hydrothermal and magmatic systems. Our analysis confirms the interpretation that the crystalline basement beneath the sediments, rather than being granitic, is oceanic in character, resembling an ophiolite complex. The heat source is most likely a cooling gabbroic intrusion, several kilometers in diameter, overlain by a sheeted dike swarm. A 6 km deep bore-hole centered over such an intrusion would not only be one of the world`s deepest geothermal wells but could also be one of the hottest.

  6. Performance of casings in Cerro Prieto production wells

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez A, B.; Vital B, F.; Bermejo M, F.; Sanchez G, G.

    1981-01-01

    A careful evaluation of different production casings used at Cerro Prieto from 1964 to date has shown that the following casings have yielded particularly impressive results: 7 5/8-in. diameter, J-55, 26 lb/ft; 7 5/8-in. diameter, K-55, 45.3 lb/ft; and 5-in. diameter, K-55, 23.2 lb/ft. These casings differ from others of the same diameter but lighter weight which were also used at the field. The results are favorable in spite of severe construction problems, especially the loss of circulation during cementing operations, which we encountered in some of the wells where these casings were used. The use of gravity-fed fine sand as packing material and the arrangement of the production and intermediate casings were important in avoiding damage due to tension-compression stresses and, above all, damage due to internal or external corrosion over time. This situation is clearly evidenced if we compare the damage to the above casings with that experienced by grade N-80 production casings, especially in a corrosive environment.

  7. Parábolas e fabulações : uma investigação em arte

    OpenAIRE

    Lia Fernanda Ramos de Oliveira

    2014-01-01

    Esta dissertação, "Parábolas e Fabulações: uma Investigação em arte", estabelece uma relação entre obras de minha autoria - o que inclui desenhos, pinturas e grafites - e as análises desta mesma produção feitas através de uma pesquisa que contempla os referenciais teóricos aos quais ela se relaciona, implicando ainda num diálogo circunstanciado com a história da arte. O trabalho processa-se por meio de textos que abordam aspectos correlatos à Arte Lowbrow, numa hibridização desse movimento. T...

  8. PATRONES DE CONSUMO FINAL DE CÉRVIDOS EN EL PARANÁ MEDIO: EL CASO DEL SITIO CERRO AGUARÁ / Cervids final consumption patterns in middle Paraná River: the case of Cerro Aguará archaeological site

    Directory of Open Access Journals (Sweden)

    Leonardo Mucciolo

    2015-06-01

    Full Text Available Los cérvidos fueron amplia y regularmente explotados por los cazadores-recolectores que habitaron la macroregión del Paraná-Plata durante el Holoceno tardío. En la cuenca media del Paraná, sin embargo, muy pocos estudios han enfocado sobre las estrategias empleadas para su obtención, procesamiento y consumo. Teniendo en cuenta esto, el objetivo de este trabajo es explorar dichos aspectos a partir del análisis de los conjuntos de cérvidos provenientes del sitio arqueológico Cerro Aguará, localizado en el departamento General Obligado (provincia de Santa Fe. La perspectiva seleccionada propone al consumo como factor preponderante en la configuración del registro zooarqueológico dentro del continuum de actividades que componen la explotación faunística. Desde esta perspectiva, y tomando en consideración que las carcasas de los cérvidos proveen distintos tipos de recursos alimenticios con diferentes costos de extracción (carne, médula y grasa ósea, se evalúan diferentes indicadores para establecer si existió diferente intensidad en su procesamiento. Los resultados indican que las dos especies de cérvidos identificadas en el sitio, Blastocerus dichotomus y Ozotoceros bezoarticus, ocuparon un rol preponderante en la dieta, aunque las carcasas del primero fueron empleadas más intensivamente probablemente en correlación con su mayor disponibilidad de nutrientes internos, tales como la médula y posiblemente la grasa ósea.  Abstract  Cervids were wide and regularly exploited by several Late Holocene hunter-gatherers inhabiting Paraná Plata macroregion. In the middle Paraná river, however, few research has been made on strategies involving their procurement, processing and consumption. The purpose of this article is to explore those aspects from the analysis of cervid assemblages of Cerro Aguará archaeological site (General Obligado, Santa Fe province. The selected perspective proposes final consumption as one of the most

  9. PRESENCIA TEOTIHUACANA EN LA CULTURA BOLAÑOS (Teotihuacan Presence in the Bolaños Culture

    Directory of Open Access Journals (Sweden)

    María Teresa Cabrero G.

    2015-09-01

    Full Text Available El cañón de Bolaños fue ocupado durante el periodo prehispánico por un grupo proveniente, posiblemente, del centro de Jalisco, puesto que traían dentro de su bagaje cultural la costumbre de depositar a sus muertos en tumbas de tiro y la construcción de conjuntos circulares como centros ceremoniales. El cañón principia en el altiplano centro-norte y corre hacia el sur hasta desembocar en el río Grande de Santiago en el centro de Jalisco. La presencia de una máscara mortuoria hecha con mosaicos de Spondylus princeps que muestra una nariguera colgante con la representación de una serpiente emplumada y, por otra parte, el descubrimiento de una nariguera con la representación de Tláloc sugieren un contacto con las caravanas teotihuacanas que transitaban a través de la ruta interior de intercambio comercial propuesta por Kelley. ENGLISH: The Bolaños Canyon was occupied during the pre-Hispanic period by a group—possibly coming from the center of Jalisco—as their cultural background included the custom of depositing their dead in shaft tombs and the construction of circular sets as ceremonial centers. The canyon begins in the north central high plateau and flows to the south, ending at the Rio Grande de Santiago in central Jalisco. The presence of a death mask made of Spondylus princeps mosaic, featuring a nose ring pendant with the representation of a feathered serpent and, moreover, the discovery of a nose ring with the representation of Tlaloc, suggest contact with Teotihuacan caravans that traveled through the inland trade route as proposed by Kelley in 1980.

  10. Petrological and Geochemical Studies of the Igneous Rocks at Cerro EL Borrego, Chihuahua, Mexico

    Science.gov (United States)

    Estrada, V. M.; Espejel-Garcia, V. V.; Villalobos-Aragon, A.

    2013-05-01

    Cerro El Borrego, which is a hill composed of igneous rocks, is located 13.7 km to the SW of Chihuahua city, in northern Mexico. The coordinates of the hill are 28° 11' 07'' N latitude and 105° 33' 23'' W longitude. The study area is within the Basin and Range Physiographic Province, characterized by a complex tectonic-structural pattern, such as elongated ranges with folds and igneous rock formations of Paleogene age. A lava flow of Oligocene age is part of the large volcanic and plutonic activity at the early times of the Cenozoic, which occurred to the NW portion of Mexico. In Cerro El Borrego, the rocks that outcrop are middle Oligocene's rhyolitic tuff to the NW of the hill, while to its SE there is a Pleistocene polymictic conglomerate. Previous work shows different interpretations about the origin and composition of the igneous rocks at Cerro El Borrego. This project includes whole rock and textural analyses, which helped to discern the petrogenesis of these rocks. Preliminary petrographic analyses indicate that the Cerro El Borrego, is a structural dome, and its feldspar-rich rocks contain large crystals that can be appreciated without a microscope. The presence of a porphyritic texture, suggest a sallow intrusion origin. A preliminary conclusion is that Cerro El Borrego is a shallow depth intrusive body with a syenitic composition derived from the Oligocene plutonic activity.

  11. Measured ground-surface movements, Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Massey, B.L.

    1981-01-01

    The Cerro Prieto geothermal area in the Mexicali Valley, 30 kilometers southeast of Mexicali, Baja California, incurred slight deformation because of the extraction of hot water and steam, and probably, active tectonism. During 1977 to 1978, the US Geological Survey established and measured two networks of horizontal control in an effort to define both types of movement. These networks consisted of: (1) a regional trilateration net brought into the mountain ranges west of the geothermal area from stations on an existing US Geological Survey crustal-strain network north of the international border; and (2) a local net tied to stations in the regional net and encompassing the present and planned geothermal production area. Electronic distance measuring instruments were used to measure the distances between stations in both networks in 1978, 1979 and 1981. Lines in the regional net averaged 25 km. in length and the standard deviation of an individual measurement is estimated to be approx. 0.3 part per million of line length. The local network was measured using different instrumentation and techniques. The average line length was about 5 km. and the standard deviation of an individual measurement approached 3 parts per million per line length. Ground-surface movements in the regional net, as measured by both the 1979 and 1981 resurveys, were small and did not exceed the noise level. The 1979 resurvey of the local net showed an apparent movement of 2 to 3 centimeters inward toward the center of the production area. This apparent movement was restricted to the general limits of the production area. The 1981 resurvey of the local net did not show increased movement attributable to fluid extraction.

  12. Actualización en el límite entre sierras Pampeanas occidentales y Precordillera Oriental, en la provincia de San Juan

    Directory of Open Access Journals (Sweden)

    Juvenal J. Zambrano

    2008-03-01

    Full Text Available En este trabajo se analiza el sistema de fallamiento existente en la depresión tectónica de Tulum, ubicada en la parte este y sur de la provincia de San Juan, en el oeste árido de Argentina. El límite entre los dos sistemas morfoestructurales, uno la Precordillera Oriental y el otro el Sistema Pampeano Occidental ha sido establecido en trabajos anteriores, a lo largo del sistema de fallamiento de Tulum, que cruza a la depresión diagonalmente en dirección NNE. No obstante la disponibilidad de nueva información de sondeos eléctricos verticales y de algunas perforaciones para búsqueda de agua subterránea, efectuados al sur y al oeste del cerro Valdivia, permite señalar que hacia el suroeste de este núcleo de basamento metamórfico limitado en ambos flancos por fallas, el límite Sistema Pampeano y Precordillera se aproxima al cordón montañoso de sierra Chica de Zonda, continuando al sur en el cerro Salinas. De allí al SSO existen, en superficie, indicaciones de que el sistema de fallamiento continúa hasta el Montecito, donde el sistema pampeano de fallas queda interrumpido por la gran falla con actividad cuaternaria que sirve de límite oriental a la sierra de Las Peñas. El contacto entre ambos sistemas forma el extremo sur de la Precordillera Oriental en subsuelo. Este conocimiento estructural permite no solo ser aplicado a la prospección de agua sino también a la de hidrocarburos en la región.

  13. Interaction of cold-water aquifers with exploited reservoirs of the Cerro Prieto geothermal system

    Science.gov (United States)

    Truesdell, Alfred; Lippmann, Marcelo

    1990-01-01

    Cerro Prieto geothermal reservoirs tend to exhibit good hydraulic communication with adjacent cool groundwater aquifers. Under natural state conditions the hot fluids mix with the surrounding colder waters along the margins of the geothermal system, or discharge to shallow levels by flowing up fault L. In response to exploitation reservoir pressures decrease, leading to changes in the fluid flow pattern in the system and to groundwater influx. The various Cerro Prieto reservoirs have responded differently to production, showing localized near-well or generalized boiling, depending on their access to cool-water recharge. Significant cooling by dilution with groundwater has only been observed in wells located near the edges of the field. In general, entry of cool water at Cerro Prieto is beneficial because it tends to maintain reservoir pressures, restrict boiling, and lengthen the life and productivity of wells.

  14. SELF-POTENTIAL SURVEY AT THE CERRO PRIETO GEOTHERMAL FIELD, BAJA CALIFORNIA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    Corwin, R.F.; Diaz C., S.; Rodriguez B., J.

    1978-06-01

    In December 1977, two self-potential survey lines were run across the producing area of the Cerro Prieto geothermal field, located about 30 km south of Mexicali, Baja California, Mexico. The purpose of the survey was to determine whether significant self-potential variations were related to the known geothermal activity. Large-amplitude, long-wavelength self-potential anomalies are seen in the Cerro Prieto geothermal field. The inflection points of the anomalies are roughly centered over two major faults thought to act as conduits for the thermal fluids, and the form of the anomalies indicates that they may be generated by electrical activity extending to a depth of several km along the fault zones. Thus, self-potential measurements may be helpful in tracing thermally active fault zones in the Cerro Prieto area.

  15. Estudio de los fundentes utilizados en la metalurgia del cobre en Cerro Muriano (Córdoba durante el período Romano Altoimperial

    Directory of Open Access Journals (Sweden)

    Criado, A. J.

    1996-10-01

    Full Text Available There are no doubts that Hispania was, under the Roman Empire, the most profitable and abundant in resources of all the mining districts exploded by Rome -Hispania, Galia, Danubian Provinces, Dacia, Greece, Asia Minor, Syria, Egypt and North Africa-. Plinius gives the same data and hands many more in the passages dedicated to the mining and the working of the metals in his Natural History. Of all the many mining places that this author refers, the exploiting in copper at Cerro Muriano presents the main interest; of this he says that it was of an unbeatable quality, used, among other applications, to manufacture the very famous "Copper of Campania". The utilization of fusing agents, adapted to the process of copper obtainment, is fundamental for obtaining this high quality. The addition of these fusing agents was very important for the control of the work parameters and to reach the required temperatures. The high purity of the obtained copper shows a very close knowledge of the phenomena involved in the process.

    Durante el Imperio Romano, de todos los distritos mineros explotados por Roma -Hispania, Galia, las provincias danubianas, Dacia, Grecia, Asia Menor, Siria, Egipto y el Norte de África-, sin duda el más rentable y más abundante en recursos era Hispania. Plinio facilita muchos datos en los pasajes dedicados a la minería y el trabajo de los metales en su Historia Natural. Entre los muchos lugares mineros que este autor cita, nos interesa ahora la explotación de cobre en Cerro Muriano, del cual dice que era de una calidad inmejorable, utilizado, entre otras aplicaciones, para fabricar el famosísimo cobre de Campania. Para poder obtener esta elevada calidad, es fundamental la utilización de fundentes adecuados en el proceso de obtención de cobre. La adición de estos fundentes era vital para controlar los parámetros de trabajo y alcanzar las temperaturas requeridas. La elevada pureza del cobre obtenido demuestra un

  16. Cinemática de la extensión jurásica vinculada a la Provincia Silícea Chon Aike, Santa Cruz, Argentina

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    María S. Japas

    2013-03-01

    Full Text Available La Provincia Silícea Chon Aike, de vasta distribución en Patagonia, plataforma continental y Península Antártica, representa un megaevento volcánico ocurrido en tiempos jurásicos (188-152 Ma, cuyo emplazamiento estuvo controlado por una tectónica extensional. El análisis cinemático llevado a cabo a partir de fallas y zonas de cizalla frágil-dúctil en cuatro localidades (El Dorado- Monserrat, Norte de Cerro Vanguardia y El Fénix, en la comarca del Deseado; y Lago Ghío, en la Cordillera Patagónica Austral, permitió definir los ejes cinemáticos de la deformación jurásica, reconocer dos eventos cinemáticos diferentes (principal y secundario e identificar la existencia de un régimen transtensional. En relación a la oblicuidad que presentan los ejes cinemáticos en estas localidades, se definieron en forma preliminar dos dominios: el oriental y el occidental. El dominio oriental (El Dorado - Monserrat, Norte de Cerro Vanguardia presenta una dirección de extensión ENE para el evento principal y NNO para el evento secundario, mientras que el dominio occidental (El Fénix y Lago Ghío exhibe direcciones de extensión NE y NO para los episodios principal y secundario, respectivamente. Estos eventos cinemáticos diferentes (principal y secundario guardan estrecha correlación con facies volcánicas definidas, ya que el episodio secundario se encuentra temporalmente restringido al momento del emplazamiento de la facies efusiva riolítica (domos, coladas, cuerpos hipabisales. Dado el marcado diacronismo de esta provincia volcánica, las diferencias estructurales y cinemáticas halladas entre ambos dominios podrían estar reflejando un emplazamiento controlado por estructuras desarrolladas progresivamente que, a escala continental, estarían vinculadas a un régimen de deformación no-coaxial mayor.

  17. Bioética e investigación: análisis de caso de la epidemia por el virus Ébola en 2014

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    Boris Julián Pinto Bustamante

    2017-01-01

    Full Text Available La epidemia por el virus Ébola, en África occidental (2014, ha suscitado una serie de interrogantes éticos en torno a las medidas de salud pública para su contención, el uso de medicamentos experimentales y el desarrollo de vacunas contra esta enfermedad. El presente trabajo explora algunas de estas preguntas desde la perspectiva de la ética en investigación biomédica. La epidemia por el virus Ébola es un modelo de estudio adecuado para abordar esfuerzos multilaterales en investigación, así como para analizar aspectos antropológicos en salud pública y determinantes sociales, económicos y políticos en salud a nivel global.

  18. Control de la posició i balanceig d’una bola sobre un pla emprant una plataforma Gough-Stewart

    OpenAIRE

    Bonet Muñoz, Albert

    2015-01-01

    El treball que es presenta a continuació consisteix en el plantejament, disseny i construcció d’un robot paral·lel amb 6 graus de llibertat del tipus Gough-Stewart per controlar, mitjançant un control PID, la posició d’una bola situada a sobre de la seva plataforma mòbil. La detecció de la bola s’ha realitzat mitjançant un sistema de visió, amb una càmera en posició zenital enfocant la part superior de la plataforma mòbil del robot. S’ha procurat assegurar una resposta ràpida, amb la màxima p...

  19. Co-infection with Mycobacterium bovis does not alter the response to bovine leukemia virus in BoLA DRB3*0902, genetically resistant cattle.

    Science.gov (United States)

    Lützelschwab, Claudia M; Forletti, Agustina; Cepeda, Rosana; Esteban, Eduardo N; Confalonieri, Omar; Gutiérrez, Silvina E

    2016-12-01

    High proviral load (HPL) profile in bovine leukemia virus infected animals poses increased risk of transmission, and development of HPL or low proviral load (LPL) profile may be attributed to host genetics. Genetic resistance and susceptibility has been mapped to the Major Histocompatibility Complex class II DRB3 gene (BoLA DRB3). The aim of this work was to determine the effect of Mycobacterium bovis infection on certain virological and host immunological parameters of BLV experimental infection. Twenty-six Argentinian Holstein calves carrying the resistance-associated marker allele BoLA DRB3*0902, susceptibility-associated marker allele BoLA DRB3*1501, or neutral BoLA DRB3 alleles, exposed to M. bovis were used. Twenty calves were inoculated with BLV, three were naturally infected and other three were BLV-negative. Seven from twenty six (27%) of the animals resulted positive to the PPD test. The proviral load, absolute leukocyte and lymphocyte counts, time to seroconversion, antibody titer against BLV, and viral antigen expression in vitro at various times post inoculation were determined and compared between PPD+ and PPD- animals. From a total of 23 BLV positive animals (naturally and experimentally infected), 13 (56.5%) developed HPL, and 10 (43.5%) developed LPL. None of the investigated parameters were affected by infection with M. bovis. We concluded that the ability of cattle carrying resistance-associated marker to control BLV and to progress towards a LPL phenotype was not altered by M. bovis co-infection.

  20. Gas equilibria in Cerro Prieto geothermal field, B.C., Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Portugal, E.; Barragan, R.M.; Izquierdo, G. [Inst. de Investigaciones Electricas, Morelos (Mexico); Leon, J. de [Comision Federal de Electricidad, Mexicali B.C. (Mexico)

    2003-07-01

    Gas equlibria methods involving fischer-tropsch-pyrite-magnetite; and fischer-tropsch-pyrite-hematite-pyrite-magnetite reactions were used to evaluate reservoir temperature and a mass steam fraction in Cerro Prieto geothermal field. These approaches have been applied in some selected producing wells from four areas under exploitation. The results show good correlation for both equilibria methods; however fischer-tropsch; pyrite-magnetite reactions provide the best estimation of the physical reservoir parameters. The main processes found for Cerro Prieto IV area are lateral vapor contribution and the inflow of hotter and deeper fluid with high liquid saturation. (orig.)

  1. Indios y blancos en la ciudad minera: Cerro de Pasco en el siglo XIX1

    OpenAIRE

    Contreras, Carlos

    2014-01-01

    En este artículo se presenta una descripción de las condiciones de vida, materiales y culturales en Cerro de Pasco durante el siglo pasado, cuando era una de las principales ciudades de la sierra peruana, tanto en lo económico como en lo demográfico.El autor discute las características de la estructura social de Cerro de Pasco, recalcando la yuxtaposición de elementos económicos y étnico-culturales y el tipo de relaciones sociales prevalecientes. Luego describe las características y condicion...

  2. Santuarios prehispánicos identificados sobre cimas de cerros en Aguascalientes, México

    OpenAIRE

    Macías Quintero, Juan Ignacio; Villagrana Prieto, Citlallitl Selene

    2016-01-01

    Este trabajo considera la presencia de estructuras arqueológicas dispuestas sobre la cima de cerros en la región Centro-Norte de México, con énfasis en el valle del río Verde-San Pedro, Aguascalientes. Regularmente, los sitios dispuestos en cerros aislados y cimas escarpadas se han contemplado como fortificaciones que reflejaban conflictos e inestabilidad. Sin embargo, hemos identificado que estos asentamientos podrían ser de santuarios que, junto con otros elementos naturales y culturales (p...

  3. Releyendo el siglo xx con roberto bolaño. estética y política agonística

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    Alberto Bejarano

    2012-09-01

    Full Text Available Leer el siglo XX literariamente a través de la novela 2666 de Roberto Bolaño es arriesgarse a pensar el siglo de una manera kafkiana o tal vez, mejor sea decir, pos-kafkiana (así como Agamben se refiere a lo pos-humano. ¿Cuál es la (relectura del siglo hecha por Bolaño en 2666?, ¿qué podría significar la expresión “lo bolañiano” para pensar el siglo?, son algunas de las preguntas que motivan estas palabras. Así como hubo un “mal del siglo” decimonónico, expresado en una idea de decadencia (Huysmans, también habría un mal del siglo veinte, encarnado en el horror y en la “visibilización de lo invisible” de Auschwitz (Blanchot.

  4. Edad y rasgos petrográficos y geoquímicos de cuerpos subvolcánicos asignables a la Formación Cerro León, este del Macizo del Deseado, Santa Cruz Age and petrography and geochemistry features of subvolcanic outcrops from Cerro León Formation, east of the Deseado Massif, Santa Cruz

    Directory of Open Access Journals (Sweden)

    D. Guido

    2004-12-01

    Full Text Available Se presentan nuevos afloramientos de cuerpos subvolcánicos correlacionables con la Formación Cerro León en el sector oriental del Macizo del Deseado. Esta unidad aflora en dos sectores, en el bajo Leonardo y en el afloramiento Bahía Laura del Complejo Río Deseado. El primer sector presenta trece diques y un filón capa intruyendo a las sedimentitas pérmicas de la Formación La Golondrina y el segundo sector comprende tres diques que intruyen a rocas del basamento. Se trata de rocas de color gris a negro, frecuentemente alteradas, con textura microgranuda a porfírica, con fenocristales de plagioclasa, diópsido (En42 Fs11 Wo47 y en menor medida de hornblendas ricas en Mg (magnesio hastingsita, en una matriz holocristalina de textura intergranular. Son rocas subalcalinas de composiciones basalto-andesita y con afinidades calcoalcalinas. La edad Ar/Ar obtenida en una de estas muestras (180,1±1,5 Ma representa la primer determinación realizada en esta unidad y es coherente con las relaciones estratigráficas observadas para esta formación. La comparación con rocas ígneas jurásicas de la provincia geológica Macizo del Deseado, favorece la vinculación temporal y genética con el evento volcánico-piroclástico del Jurásico medio a superior (Formación Bajo Pobre y Grupo Bahía Laura. Sin embargo, la diferencia en las edades Ar/Ar, sugieren una interrupción entre el evento subvolcánico (180 Ma y el volcanismo Jurásico medio a superior (177 a 150 Ma. Se considera, preliminarmente, que los cuerpos subvolcánicos de la Formación Cerro León representarían las primeras evidencias magmáticas del rift jurásico en el Macizo del Deseado.New subvolcanic outcrops, correlated with the Cerro León Formation and located in the eastern Deseado Massif, are presented. This unit outcrops in two sectors, the Leonardo depression and the Bahía Laura outcrop of the Río Deseado Complex. In the first sector there are thirteen dikes and a sill

  5. Relación entre factores micro- estructurales e impacto repetido en aleaciones de alto cromo para bolas de molino.

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    E. Albertin

    2008-01-01

    Full Text Available Las aleaciones de alto cromo son empleadas para la fabricación de bolas de molino en industrias de procesamiento de minerales. Los usuarios y fabricantes requieren lograr mejores resultados técnicos-económicos en sus aplicaciones, por lo que necesitan aumentar los conocimientos relacionados con los aspectos estructurales de estos materiales. En este trabajo se realiza una investigación con vistas a establecer relaciones entre la estructura de las aleaciones y su comportamiento ante el impacto repetido que es un fenómeno característico en estos procesos. Se funden bolas con varias aleaciones hipo eutécticas, eutécticas, e hipereutécticas; se prueban en un equipo que simula el impacto repetido. Los resultados permiten comprobar los buenos resultados de aleaciones hipo eutécticas con relaciones de Cr/C altas y a su vez altos contenidos de Cr y de aleaciones eutécticas para menores relaciones de Cr/C y menores contenidos de Cr, en ambos casos los carburos eutécticos son de forma simétrica, regulares y no forman redes continuas de carburos asimétricos bordeando los granos, que presentan peores comportamiento en el impacto repetido y que son el caso de las hipoeutécticas con bajas relaciones Cr/C y las hipereutécticas donde aparecen también grandes carburos primarios.High Chromium alloys are used to manufacture grinding balls for the Industry of Construction Materials. Customers and users need to improve their knowledge about the relationships between microstructure and the parts damage in these alloys to obtain better technical-economics results. In this paper the results of a research to obtain different microstructures of eutectics, hipoeutectics and hipereutectics alloys are presented, searching for the lesser damage in these alloys. These alloys are tested in a repeated impact testing machine that simulate its mechanical behaviour .The results show a good behaviour for hipoeutectic alloys with high relations of Cr/C and high

  6. The Cerro Grande Fire - From Wildlife Modeling Through the Fire Aftermath

    Energy Technology Data Exchange (ETDEWEB)

    Rudell, T. M. (Theresa M.); Gille, R. W. (Roland W.)

    2001-01-01

    The Cerro Grande Fire developed from a prescribed burn by the National Park Service at Bandelier National Monument near Los Alamos, New Mexico. When the burn went out of control and became a wildfire, it attracted worldwide attention because it threatened the birthplace of the atomic bomb, Los Alamos National Laboratory (LANL). Was LANL prepared for a fire? What lessons have been learned?

  7. Provincia y Restituo en el Bronce de El Bierzo

    Directory of Open Access Journals (Sweden)

    López Barja de Quiroga, Pedro

    2010-12-01

    Full Text Available Three are three main ideas discussed in this paper: first, that prouincia Transduriana is a perfectly valid denomination for a Roman province; second, that it was a fully fledged province, not merely a sub-province or a military command post, because, according to Roman Law, delegated jurisdiction cannot be delegated a second time-, and finally, that with restituo the emperor Augustus annulled a previous conviction imposed on the Aliobrigiaecini.Tres son las ideas principales: que prouincia Transduriana es una denominación perfectamente válida para una provincia romana; que se trataba de una provincia como cualquier otra, no de una subprovincia ni de una misión militar, pues en derecho romano la jurisdicción delegada no puede delegarse a su vez y, por último, que al restituir, Augusto levantó una condena anterior impuesta a los Aliobrigiaecini.

  8. El caso de la provincia de Salta (1880-1914

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    Mar\\u00EDa Fernanda Justiniano

    2005-01-01

    Full Text Available E l desarrollo rápido de la Pampa húmeda argentina a fines del siglo XIX no fue igual en todas las regiones. El Chaco y la Patagonia fueron áreas marginadas, y Salta una región aislada del boom expansivo que incorpora a la República Argentina a la modernidad y al capitalismo. Las elites gobernantes de la provincia de Salta usaron diversas estrategias para conservar el poder e integrarse, de manera exitosa, al grupo dominante. Este artículo se basa en el análisis exploratorio y descriptivo de los presupuestos de la provincia de Salta, entre 1880/1914 – y estudia cómo se ejecutan los mismos. Su objetivo es mostrar las estrategias desplegadas por determinadas familias para perpetuarse en el control del estado provincial y aumentar sus patrimonios.

  9. ESTUDO DO DESGASTE DE REVESTIMENTO INTERNO DE UM MOINHO DE BOLAS OPERANDO COM ROCHA FOSFÁTICA

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    André Carlos Silva

    2014-07-01

    Full Text Available O revestimento interno dos moinhos vem tomando maior proeminência devido à sua influência direta na eficiência de moagem e pelo alto custo agregado relacionado ao seu tempo de operação. Uma vez que o desgaste do revestimento não é uniforme, foi realizado o acompanhamento do desgaste do revestimento interno do moinho de bolas (SAG 4,87 x 6,09 m da empresa Vale Fertilizantes S.A. Unidade Catalão-GO. Tal moinho trabalha com rocha fosfática e o monitoramento se deu através de um dispositivo prático visando à determinação do comportamento do desgaste do revestimento ao longo de toda a extensão do moinho, desde a alimentação até a descarga, bem como a variação em um único perfil de uma placa do revestimento. Observou-se que o desgaste não é uniforme tanto ao longo do moinho quanto em um mesmo perfil, indicando que o maior desgaste ocorre nos primeiros e últimos 1,5 metros, com valores muito próximos. Na alimentação do moinho o desgaste específico foi de 0,60 g/t, na descarga de 0,63 g/t e no do centro do moinho de aproximadamente 0,55g/t.

  10. Nuevos datos, viejas colecciones: los conjuntos óseos de Cerro Casa de Piedra Cueva 5 (Parque Nacional Perito Moreno, Santa Cruz New data, old collections: Cerro Casa de Piedra 5 bone assemblages (Perito Moreno National Park, Santa Cruz Province, Argentina

    Directory of Open Access Journals (Sweden)

    Mariana E. De Nigris

    2007-12-01

    Full Text Available En este trabajo se presentan los resultados de un nuevo análisis de las colecciones óseas de Cerro Casa de Piedra Cueva 5, emplazado en el Parque Nacional Perito Moreno, provincia de Santa Cruz. Las muestras óseas fueron recuperadas en excavaciones sistemáticas realizadas en la década del ´80 y se ubican temporalmente en el Holoceno medio y tardío (ca. 2500-6500 años. El principal objetivo de este estudio es identificar las posibles variaciones existentes en el aprovechamiento de los recursos faunísticos con el fin de alcanzar un mayor entendimiento de las estrategias que implementaron las sociedades cazadoras recolectoras en torno a la utilización de los recursos de origen animal. Los resultados señalan al guanaco (Lama guanicoe como la especie dominante si bien el huemul (Hippocamelus bisulcus forma parte importante de la dieta. En ambos ungulados se observa un predominio del esqueleto apendicular por sobre el axial y una gran diversidad de marcas de procesamiento compatibles con situaciones de consumo. Sin embargo, a pesar de estas regularidades se han registrado también diferencias en el aprovechamiento de las presas a través del tiempo.This paper presents the results of a new analysis of bone collections from Cerro Casa de Piedra Cueva 5. The archaeological site is a large cave positioned on the north side of a volcanic hill located on the southern bank of Roble river (900 masl in a transitional area between the forest and the shrubby Patagonian steppe within the Perito Moreno National Park, northwest of Santa Cruz, Argentina. The occupational sequence is formed by four stratigraphic layers radiocarbon dated between ca. 2500 and 6500 years BP. Bone samples had been recovered during the 1980s but have received no attention since. The main aim of this paper is to identify continuities and changes in faunal resource consumption to better understand hunter-gatherer strategies during the Middle and Late Holocene. The analyzed

  11. LAS CONSECUENCIAS JURÍDICAS DE NO SER UNA PROVINCIA*

    Directory of Open Access Journals (Sweden)

    Leonardo Hugo Limanski

    2015-09-01

    Full Text Available En el presente trabajo se analiza, en forma profunda, la autonomía de la Ciudad Autónoma de Buenos Aires, en comparación con las 23 provincias argentinas. A su vez, se intentará demostrar que la Ciudad de Buenos Aires debe ser tratada en forma equivalente a una provincia, desarrollando los problemas que la interpretación actual de la Constitución Nacional por parte de la Corte Suprema acarrea. A los efectos de lograr una cabal comprensión del tema se realizará una breve reseña histórica partiendo desde la federalización en el año 1880, y se hará hincapié en aquellos temas que, creo, violan la igualdad. Es así que se pondrán de manifiesto cuales son las consecuencias jurídicas de no ser considerada una provincia y, por último, se realizará una aproximación al vínculo existente entre las comunas y los municipios, a efectos de dejar planteado un problema

  12. The Peculiar Art of Cultural Formations: Roberto Bolaño and the Translation of Latin American Literature in The United States

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    Sarah Pollack

    2008-01-01

    Full Text Available Les Détectives sauvages de Roberto Bolaño, traduit en anglais en 2007, représente une rupture avec l’esthétique en pleine expansion du réalisme magique et l’appétit du lecteur états-unien pour ce genre. La décision du New York Times de décerner au roman de Bolaño sa plus grande distinction, ainsi que les comptes-rendus enthousiastes que le livre a reçus dans d’autres publications à travers le pays, interrogent inévitablement : comment l’ establishement littéraire des Etats-Unis reconfigure-t-il actuellement ce qu’il juge être « la littérature latino-américaine », et, par extension, comment cette région est-elle représentée à travers la traduction anglaise de ces romans ? Bien que Les Détectives sauvages réorganisent en apparence les coordonnées du roman latino-américain, l’image qui transparaît dans ses pages révèle certaines idées préconçues de l’altérité qui satisfont l’imaginaire des consommateurs de culture états-uniens.Roberto Bolaño’s The Savage Detectives, translated in 2007, represents a break with “boom” aesthetics and the U.S. reader’s appetite for magic realism. The New York Times’s decision to honor Bolaño’s 577-page-long novel with its highest accolade, and the rave reviews the novel received in other publications across the country, necessitate the pondering of how the U.S. literary establishment is presently reconfiguring what it deems “Latin American literature” to be, and, by extension, how it represents the region to itself through literature in English translation. I propose that although The Savage Detectives ostensibly realigns the coordinates of the Latin American novel, the image that is gleaned from its pages foments other (preconceptions of alterity that satisfy the fantasies and collective imagination of U.S. cultural consumers.Los detectives salvajes (1998 de Roberto Bolaño, traducido al inglés en 2007, representa una ruptura con las est

  13. Geología de la región del Cerro Guanaquero, Río Diamante, Mendoza Geology of Cerro Guanaquero region, Diamante River, Mendoza

    OpenAIRE

    Federico Fuentes; Ramos,Victor A.

    2008-01-01

    El estudio realizado presenta nuevos datos sobre un sector poco conocido de la Cordillera Principal de Mendoza, en la alta cuenca del río Diamante en las adyacencias del cerro Guanaquero, y los primeros datos geocronológicos de sus rocas volcánicas. Las unidades geológicas presentes en el área se dividen en cuatro grupos principales: secuencias sedimentarias mesozoicas marinas y continentales intensamente plegadas y falladas; intrusivos y volcanitas intermedias de edad neógena; rocas volcánic...

  14. Hacia un análisis comparativo de Cromañón, Ycuá Bolaños y Kiss

    OpenAIRE

    Laura Codaro

    2015-01-01

    Cromañón en Argentina, Ycuá Bolaños en Paraguay y Kiss en Brasil, representaron tres grandes tragedias desarrolladas en lo que va del siglo XXI que causaron la muerte de centenares de personas. Estos incendios devenidos “hechos de carácter criminal” mostraron, en principio, la precariedad en la que se encontraban numerosos espacios a los que muchos jóvenes concurrían para divertirse, escuchar un show musical o simplemente comprar algún producto. La desregulación estatal en las habilitaciones ...

  15. Resultados y retos en salud pública ante la alerta por Ébola: una perspectiva desde Cataluña

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    Mireia Jané

    2017-03-01

    Full Text Available El brote de enfermedad por virus Ébola iniciado en Guinea Conakry y notificado a la Organización Mundial de la Salud en marzo de 2014 ha sido el mayor documentado hasta la fecha. Su extensión a países limítrofes y el riesgo de expansión fuera del continente africano hicieron que, en agosto de 2014, fuese declarado emergencia de salud pública internacional. En el marco de lo establecido por el Centro de Coordinación de Alertas y Emergencias Sanitarias, la Agencia de Salud Pública de Cataluña inició las actuaciones de salud pública en marzo de 2014 y elaboró un único protocolo para todo el territorio, consejos para viajeros y cooperantes procedentes de países afectados, y una nota informativa semanal. Asimismo, en Cataluña, se crearon el Comité de Análisis y Seguimiento de Ébola y el Comité Científico Asesor de Ébola. Se realizaron sesiones informativas y formativas a más de 9600 profesionales de la salud de diferentes ámbitos. Desde agosto de 2014, a través del Sistema de Urgencias de Vigilancia Epidemiológica de Cataluña se notificaron 117 sospechas de Ébola. En tres casos se activó el protocolo con derivación al centro hospitalario de referencia, siendo los resultados descartados microbiológicamente. Se realizó la vigilancia de 95 cooperantes, un 52% mujeres y un 74% procedentes de Sierra Leona. En la gestión de alertas fueron esenciales la preparación y la planificación previas, el trabajo sinérgico entre la red epidemiológica, la asistencial y el conjunto de agentes implicados, así como la comunicación de riesgo precisa, veraz y proporcionada. Fue clave el circuito de cribado previo establecido ante la sospecha de casos por parte de los servicios de vigilancia epidemiológica. Así, solo se activó el protocolo de inmediato en aquellos casos que cumplían estrictamente los criterios. Este es un aspecto esencial a reforzar y mantener de cara a futuras alertas de salud pública internacional.

  16. Aproximaciones polinómicas al método parábola-rectángulo

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    de Miguel Rodríguez, José L.

    1988-04-01

    Full Text Available The article puts forward the formulation of flexure reinforcement in rectangular sections according to the parabola-rectangle model, obtains mass development and discusses the precision obtained by polynomial formulations of varios orders. Said formulation allows the author to ponder the different effects of each variable included in the original formulation. He reaches the conclusion that a first order approximation is sufficiently precise in practical use, an interesting physical interpretation, and notable simplicity, not having any variable difficult to estimate in real cases. The study is extended to the case of compressive reinforcement. Here it is found that the same formulation allows the case to be solved. For T-sections, the author concludes that the simplified expression is too conservative, and suggests corrections in it.

    Se expone la formulación de la armadura de flexión en secciones rectangulares según el modelo parábola-rectángulo, se obtiene el desarrollo en serie y se discute la precisión obtenida por las formulaciones polinómicas de varios órdenes. Dicha formulación permite ponderar la diferente repercusión de cada variable incluida en la formulación original. Se llega a concluir que una aproximación de primer orden posee en la práctica suficiente precisión, una interesante interpretación física, y una notable simplicidad, no conteniendo alguna variable de difícil estimación en los casos reales. El estudio se amplía al caso de armadura de compresión, comprobándose que la misma formulación permite resolver este caso. Para secciones en forma de T se concluye que la expresión simplificada es conservadora en demasía, y se sugieren correcciones a la misma.

  17. Case history report on East Mesa and Cerro Prieto geothermal fields

    Energy Technology Data Exchange (ETDEWEB)

    Davis, DG.; Sanyal, S.K.

    1979-06-01

    Well log analysis as applied to the geothermal industry is one of the areas of technology in great need of further development. One means of improving log analysis technology is to study case histories of the past uses of log analysis as applied to specific fields. The project described in this report involved case history studies on two well-known geothermal areas in North America: the East Mesa field in California and the Cerro Prieto field in Mexico. Since there was considerably more pertinent material available on East Mesa, a major part of the effort on this project was devoted to studying the East Mesa field. One particular problem that first came to attention when studying the Cerro Prieto data was the difficulty in determining actual formation temperature at the time of logging. Since the temperature can have a significant effect on well log readings, an accurate temperature determination was considered to be important.

  18. H2S and CO2 emissions from Cerro Prieto geothermal power plant, Mexico

    Science.gov (United States)

    Peralta, Oscar; Franco, Luis; Castro, Telma; Taran, Yuri; Bernard, Ruben; Inguaggiato, Salvatore; Navarro, Rafael; Saavedra, Isabel

    2014-05-01

    Cerro Prieto geothermal power plant has an operation capacity of 570 MW distributed in four powerhouses being the largest geothermal plant in Mexico. The geothermal field has 149 production wells. It is located in Cerro Prieto, Baja California, 30 km to the south of the Mexico-US border. Two sampling campaigns were performed in December 2012 and May 2013 where geothermal fluids from 46 production wells and 10 venting stacks were obtained and analyzed by gas chromatography coupled to mass spectrometry. Average CO2 and H2S composition of samples from venting stacks were 49.4% and 4.79%, respectively. Based on the chemical composition of samples, the geothermal power plant emits every day from venting stacks 869 tons of CO2, plus 68 tons of H2S, among other non-condensable gases.

  19. Occurrences of alunite, prophyllite, and clays in the Cerro La Tiza area, Puerto Rico

    Science.gov (United States)

    Hildebrand, Fred Adelbert; Smith, Raymond J.

    1959-01-01

    A deposit of hydrothermally altered rocks in the Cerro La Tiza area located between the towns of Comerio and Aguas Buenas, approximately 25 kilometers southwest of San Juan, Puerto Rico, was mapped and studied to determine the principal minerals, their extent distribution and origin, and the possibility of their economic utilization, especially in Puerto Rico. The Cerro la Tiza area is about 7? kilometers long, has an average width of about 1? kilometers and embraces a total area of approximately 15 square kilometers. The principal mineralized zone, a dike-like mass of light-colored rocks surrounded by dark-colored volcanic country rocks, occupies the crest and upper slopes of east-trending Cerro La Tiza ridge and is believed to be of Late Cretaceous or Eocene age. This zone is approximately 5,300 meters long, 430 meters wide and has an area of approximately 225 hectares (556 acres). The rocks of the mineralized zone are of mixed character and consist mainly of massive quartzose rocks and banded quartz-alunite rocks closely associated with foliated pyrophyllitic, sericitic and clayey rocks. The principal minerals in probably order of abundance are quartz, alunite, pyrophyllite, kaolin group clays (kaolinite and halloysite) and sericite. Minerals of minor abundance are native sulfure, diaspore, svanbergite (?), sunyite (?), hematite, goethite, pyrite, rutile (?) and very small quantities of unidentified minerals. The mineralized zone has broken down to deposits of earth-rock debris of Quaternary age that cover much of the slopes and flanks of Cerro La Tiza. This debris consists generally of fragments and boulders with a very large size range embedded in a clayey matrix. The distribution of the earth-rock debris with respect to the present topography and drainage suggests that it may have undergone at least two cycles of erosion. Underlying the earth-rock debris and completely enclosing the mineralized zone are country rocks of probably Late Cretaceous age. These

  20. Progress report on LBL's numerical modeling studies on Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Halfman-Dooley, S.E.; Lippman, M.J.; Bodvarsson, G.S.

    1989-04-01

    An exploitation model of the Cerro Prieto geothermal system is needed to assess the energy capacity of the field, estimate its productive lifetime and develop an optimal reservoir management plan. The model must consider the natural state (i.e., pre-exploitation) conditions of the system and be able to predict changes in the reservoir thermodynamic conditions (and fluid chemistry) in response to fluid production (and injection). This paper discusses the results of a three-dimensional numerical simulation of the natural state conditions of the Cerro Prieto field and compares computed and observed pressure and temperature/enthalpy changes for the 1973--1987 production period. 16 refs., 24 figs., 2 tabs.

  1. Seismicity studies in the region of the Cerro Prieto Geothermal Field

    Energy Technology Data Exchange (ETDEWEB)

    Albores, A.; Reyes, A.; Brune, J.N.; Gonzalez, J.; Garcilazo, L.; Suarez, F.

    1980-01-01

    This paper reports results from seismicity studies in the region of the Cerro Prieto geothermal field. These studies were conducted with local short period seismic arrays during 1974-1975 and 1977-1978. During the latter period, horizontal seismometers were used for better control on the S-wave arrival times. Locations were obtained for about 200 events and composite fault plane solutions were obtained for five groups of events. 16 refs.

  2. Identification of fluid-flow paths in the Cerro Prieto geothermal field

    Science.gov (United States)

    Halfman, S. E.; Lippmann, M. J.; Zelwer, R.; Howard, J. H.

    1982-05-01

    A hydrogeologic model of the Cerro Prieto geothermal field has been developed based on geophysical and lithologic well logs, downhole temperature, and well completion data from about 90 deep wells. The hot brines seem to originate in the eastern part of the field, flowing in a westward direction and rising through gaps in the shaly layers which otherwise act as partial caprocks to the geothermal resource.

  3. The age and constitution of Cerro Campanario, a mafic stratovolcano in the Andes of central Chile

    Science.gov (United States)

    Hildreth, W.; Singer, B.; Godoy, E.; Munizaga, F.

    1998-01-01

    Cerro Campanario, a towering landmark on the continental divide near Paso Pehuenche, is a glacially eroded remnant of a mafic stratovolcano that is much younger than previously supposed. Consisting of fairly uniform basaltic andesite, rich in olivine and plagioclase, the 10-15 km3 edifice grew rapidly near the end of the middle Pleistocene, about 150-160 ka, as indicated by 40Ar/39Ar and unspiked K-Ar analyses of its lavas.

  4. A review of the hydrogeologic-geochemical model for Cerro Prieto

    Science.gov (United States)

    Lippmann, M.J.; Truesdell, A.H.; Halfman-Dooley, S. E.; Mañónm, A.

    1991-01-01

    With continued exploitation of the Cerro Prieto, Mexico, geothermal field, there is increasing evidence that the hydrogeologic model developed by Halfman and co-workers presents the basic features controlling the movement of geothermal fluids in the system. In mid-1987 the total installed capacity at Cerro Prieto reached 620 MWc, requiring a large rate of fluid production (more than 10,500 tonnes/hr of a brine-steam mixture; August 1988). This significant mass extraction has led to changes in reservoir thermodynamic conditions and in the chemistry of the produced fluids. Pressure drawdown has caused an increase in cold water recharge in the southern and western edges of the field, and local and general reservoir boiling in parts of the geothermal system. After reviewing the hydrogeologic and geochemical models of Cerro Prieto, the exploitation-induced cold water recharge and reservoir boiling (and plugging) observed in different areas of the field, are discussed and interpreted on the basis of these models and schematic flow models that describe the hydrogeology. ?? 1991.

  5. Evolution of the Cerro Prieto geothermal system as interpreted from vitrinite reflectance under isothermal conditions

    Energy Technology Data Exchange (ETDEWEB)

    Barker, C.E. (US Geological Survey, Denver, CO); Pawlewicz, M.J.; Bostick, N.H.; Elders, W.A.

    1981-01-01

    Temperature estimates from reflectance data in the Cerro Prieto system correlate with modern temperature logs and temperature estimates from fluid inclusion and oxygen isotope geothermometry indicating that the temperature in the central portion of the Cerro Prieto System is now at its historical maximum. Isoreflectance lines formed by contouring vitrinite reflectance data for a given isothermal surface define an imaginary surface that indicates an apparent duration of heating in the system. The 250/sup 0/C isothermal surface has a complex dome-like form suggesting a localized heat source that has caused shallow heating in the central portion of this system. Isoreflectance lines relative to this 250/sup 0/C isothermal surface define a zone of low reflectance roughly corresponding to the crest of the isothermal surface. Comparison of these two surfaces suggest that the shallow heating in the central portion of Cerro Prieto is young relative to the heating (to 250/sup 0/C) on the system margins. Laboratory and theoretical models of hydrothermal convection cells suggest that the form of the observed 250/sup 0/C isothermal surface and the reflectance surface derived relative to it results from the convective rise of thermal fluids under the influence of a regional hydrodynamic gradient that induces a shift of the hydrothermal heating effects to the southwest.

  6. Relationship between water chemistry and sediment mineralogy in the Cerro Prieto geothermal field: a preliminary report

    Energy Technology Data Exchange (ETDEWEB)

    Valette-Silver, J.N. (Univ. de Perpignan, France); Thompson, J.M.; Ball, J.W.

    1981-01-01

    The chemical compositions of waters collected from the Cerro Prieto geothermal production wells and hydrothermal emanations are different. Compared to the Cerro Prieto well waters, the surficial waters generally contain significantly less potassium, slightly less calcium and chloride, and significantly more magnesium and sulfate. In comparison to the unaltered sediments, the changes in the mineralogy of the altered sediments appear to be controlled by the type of emanation (well, spring, mud pot, geyser, fumarole, or cold pool). However, an increase in quartz and potassium feldspar percentages seems to be characteristic of the majority of the sediments in contact with geothermal fluids. Preliminary attempts to model the chemical processes occurring in the Cerro Prieto geothermal field using chemical equilibrium calculations are reported. For this purpose the chemical compositions of thermal waters (well and surficial emanation) were used as input data to make calculations with SOLMNEQ and WATEQ2 computer programs. Then the theoretical mineral composition of altered sediments was predicted and compared to the mineralogy actually observed in the solid samples.

  7. Materiales del Poblado de las Paredejas en el Cerro del Berrueco. Una Nueva Arracada

    Directory of Open Access Journals (Sweden)

    Carlos PIÑEL

    2009-10-01

    Full Text Available Queremos dar a conocer con esta nota el interesante hallazgo de una arracada de oro en el yacimiento de «Las Paredejas» o «Santa Lucía», en el Cerro del Berrueco, así como de otros objetos, procedentes del mismo lugar, que quizá nos acerquen a un conocimiento de la joyería occidental durante la 2.a Edad del Hierro en la Península y por otra parte a una mayor aclaración del conjunto arqueológico que constituye el Cerro del Berrueco, dos de cuyos poblados fueron estudiados por Maluquer: el yacimiento de «La Mariselva», situado en la ladera meridional del Berroquillo, perteneciente al Bronce I y II y el del «Canoho Enamorado», situado este último en la parte alta del Cerro y desarrollándose durante la 1.a Edad del Hierro, a partir de cuya fecha surgen los poblados que se localizan en la base.

  8. La larga marcha ambiental en la provincia de Santa Fe.

    OpenAIRE

    2008-01-01

    Recibido: Jun. 2008 – Aceptado Sep. 2008 Alejandro Kaminsky La ley 10.000 (T.O. 12.015) de la Provincia de Santa Fe, se construyó como instrumento pionero –09/01/87– del universo jurídico ambiental. Esta verdadera “acción popular de protección” de los intereses colectivos – formalmente denominada “recurso contencioso administrativo sumario” – ostenta las ventajas de la acción de amparo ambiental (ley 25.675), sin exigir las condiciones y requisitos de aquella, y al mismo tiempo prohibe ...

  9. PCR-RFLP Analysis of Exon 2 of Bola-DRB3 Gene in Gayal%大额牛Bola-DRB3基因第2外显子的PCR-RFLP多态性分析

    Institute of Scientific and Technical Information of China (English)

    陈智华; 顾磊; 钟金城; 胡汉傈; 李子良

    2007-01-01

    本文应用PCR-RFLP方法研究了大额牛MHC Ⅱ类基因座位的Bola-DRB3基因第2外显子的遗传多态性.结果表明:Hae Ⅲ酶切出现3种基因型,即NN、OO、NO,由N和Q两个等位基因控制;NO为优势基因型,O为优势基因.RsaⅠ酶切也出现3种基因型,即PP、Pq、QQ,由P和Q两个等位基因控制;QQ为优势基因型,Q为优势基因,说明大额牛在有些基因位点上,特别是在Bola基因系统中还是具有较为丰富的遗传多态性;经X2适合性检验表明两位点均符合Hardy-Weinberg平衡,这对保种是有利的.作者认为目前大额牛的保种应以传统保种方法为主,在泸水县、福贡县等地引种,异地纯繁成功的基础上,国家给予重点扶持,建立保种场和核心群进行重点保种;同时,应积极探索冻精、冻胚以及分子标记辅助保种和基因库保种等方法,加大生物技术保种的研究和应用力度;在必要的条件下建立大额牛冻精、冻胚的"基因库",开展细胞工程、胚胎工程方面的研究,并探讨细胞核移植作为大额牛遗传资源保存的可行性和现实性.

  10. New data on the bottom topography, recent sedimentation and water balance of Cerro Prieto dam, Mexico

    Science.gov (United States)

    Yutsis, Vsevolod; Levchenko, Oleg; Lowag, Jens; Krivosheya, Konstantin; de León Gómez, Héctor; Kotsarenko, Anatolyi

    2010-05-01

    Cerro Prieto Dam, a small water reservoir in the NE Mexico, is characterized by very high velocity of recent sedimentation, high sub-bottom seepage and erosion, and as a result, nonlinear water balance. These phenomenons never were studied since construction of the dam in the beginning of 1980th. So the goal of our work was to investigate the bottom topography and also sub-bottom near surface structure using the parametric acoustical effect. High-resolution sub-bottom profiling, using the Innomar SES-2000 compact echosounder, was carried out in Cerro Prieto Dam during February-April of 2008. The survey was conducted onboard of a small motor boat. The SES transducer was mounted on the front side of the boat using light metal pipe, and all electronic equipment was installed on the deck. Accurate positioning of the boat was reached by GPS. Average speed was 8-10 km/h. Innomar's software tool ISE was provides near real-time post-processing of the collected SES data and operation procedure could be corrected on-line. Acoustic signal ensured vertical resolution of 10-15 cm at acceptable penetration up to 15 m. Bathymetry map was compiled assuming average sound velocity of 1450 m/s. The irregular bottom topography of Cerro Prieto dam was discovered. The present elevation of the water surface is about 181 m above see level, and the lake depth varies from 1-2 to 28 m. The SES records show a distinct bottom layer of recent sediments by 0.5 - 4 m thickness which follows reservoir floor topography. Very specific acoustic anomalies, which seem to be related with gas sediments, are observed. The integrated SES, gravity, magnetic and geoelectrical data interpretation allows assuming a series of the superficial fractures focused in a NW direction, perpendicular (NE-SW) to the general deep fault zone. Hydrological balance for the Cerro Prieto water reservoir has been analyzed for last two decades. There are three types of water level fluctuations on the Cerro Prieto dam: long

  11. Association of BoLA DRB3 and DQA1 alleles with susceptibility to Neospora caninum and reproductive outcome in Quebec Holstein cattle.

    Science.gov (United States)

    Schwab, Anne E; Geary, Timothy G; Baillargeon, Paul; Schwab, Andreas J; Fecteau, Gilles

    2009-10-28

    The BoLA DRB3 and DQA1 genes are part of the major histocompatibility complex (MHC) class II in cattle. These genes are highly polymorphic and have been associated with resistance to several diseases, such as mastitis, Bovine Leukemia Virus (BLV) and dermatophilis. Sequenced based typing of these genes has been carried out extensively from blood samples; however it is often impractical or expensive to obtain such samples. Repositories of well-characterized serum from cattle are readily available in many veterinary research facilities. This paper reports a retrospective analysis of BoLA class II genotypes of cattle obtained from stored serum samples from Holstein cattle from Québec dairy farms, which were obtained as part of a previous study on bovine neosporosis. It was possible to genotype 56 cattle with known infection status for Neospora caninum. We identified 14 different DRB3 and 10 different DQA1 alleles in this population. The allele frequency distribution was consistent with previously studied cattle populations, and alleles known to be associated with BLV and mastitis were present. No association was found between allele frequency distribution of DRB3 or DQA genes and infection with N. caninum. However, an association of allele DRB3*1001 and allele DRB3*2703 with resistance and susceptibility to pregnancy loss, irrespective of infection status, was identified.

  12. De muertas y policías: la duplicidad de la novela negra en la obra de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Nilia Viscardi

    2013-12-01

    Full Text Available Se presenta una sociología de las representaciones de la violencia a partir del estudio de la novela policial. Tomando como base los comentarios frankfurtianos sobre el auge de la novela policial en la modernidad, se comparan dos escritores europeos (Andrea Camilleri y Henning Mankell con un latinoamericano (Roberto Bolaño. 2666, la novela de Bolaño, se construye desde un tipo particular de violencia social relacionada con la impunidad y la impotencia del estado, o en definitiva, con la imposibilidad del proyecto moderno. Esta realidad da lugar a un tipo de representación que se aparta de los cánones de la novela policial, como se apreciará en la caracterización del detective. Investigando los violentos desafíos al frágil orden social, este nuevo tipo de novela policial latinoamericana pone en cuestión los mecanismos de representación de la muerte, esto es, la representación de lo irrepresentable.

  13. Angiostrongylus vasorum in 20 cani della provincia di Chieti, Italia

    Directory of Open Access Journals (Sweden)

    Daniela Morelli

    2011-01-01

    Full Text Available A seguito di un caso di Angiostrongylus vasorum, diagnosticato all’inizio del 2008 nella provincia di Chieti, è stata organizzata una ricerca parassitologica al fine di indagare la presenza del parassita nei cani nella stessa area. Da gennaio a settembre 2008 sono stati esaminati 178 cani, 56 carcasse e 122 campioni di feci. Nelle carcasse sono stati ricercati i parassiti adulti nel ventricolo destro e nell’arteria polmonare e le forme larvali in tessuti di organi interni e cervello. Nelle feci è stata ricercata la forma larvale L1 con tre metodiche diagnostiche utilizzate correntemente per la ricerca di endoparassiti e larve di strongili broncopolmonari. Sono stati diagnosticati 20 casi (8,9% con identificazione di parassiti adulti in 5 cani e larve L1 in altri 15 soggetti. L’esame anatomopatologico delle carcasse dei cani con nematodi adulti ha evidenziato polmonite, pleurite, schiuma rossastra in trachea, versamento di liquido sieroemorragico in cavità toracica e ingrossamento di linfonodi medinici e meseraici. L’esame istologico dei tessuti ha evidenziato quadri gravi e sovrapponibili con lesioni da localizzazione dei parassiti in reni, linfonodi e cervello. Il numero cospicuo di casi riscontrati ha reso indispensabile considerare l’angiostrongilosi nelle diagnosi differenziali degli esami clinici e autoptici di cani della provincia di Chieti (Italia e dei territori confinanti.

  14. Asosiasi Keragaman Lokus DNA Mikrosatelit DRB3 Gen Bola dengan Berat Badan Induk dan Berat Lahir Pedet pada Sapi Bali

    Directory of Open Access Journals (Sweden)

    Ni Nyoman Trinayani

    2013-11-01

    Full Text Available Normal 0 false false false EN-US X-NONE X-NONE Genomic selection has a high potency to improve the genetic quality of Bali cattle. In effort to find out a molecular marker or DNA segment which is linked with a certain phenotype, we examined the association between BoLa-DRB3 microsatellite polymorphism and dam body weight and birth weight of calves in Bali cattle. A total of 40 dams from Abuan Village, the District of Susut was investigated. The total DNA was extracted with QIAamp DNA blood mini kit. The locus was amplified using PCR technique with a 54OC annealing temperature.. Alleles were separated through PAGE 6%, and visualized with silver staining. We found 10 alleles which their length varied from 145 bp to 233 bp. Allele 195 had the highest frequency that was 35.0%. The HE, HO, PIC were 0.821, 0.875, and 0.791 consecutively. Statistical analysis showed that the polymorphism of DRB3 microsatellite had a marginally significant association (p < 0.1 to the dam body weight. However, it had no significant association to the birth weight of the calves. The results of the research reflect that the DRB3-BoLA gene has a weak potency in controlling the body weight. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; text-align:justify; line-height:150%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;}

  15. Análisis paleoambiental y procedencia de los depósitos en el extremo suroeste de la sierra de Aconquija, provincia de Catamarca

    Directory of Open Access Journals (Sweden)

    Claudia Inés Galli

    2012-12-01

    Full Text Available Se realizó el estudio de facies y petrografía de los depósitos sedimentarios y volcaniclásticos-sedimentarios expuestos en la zona de cerro Atajo, cerro Blanco y alrededores del río Capillita, provincia de Catamarca, con el fin de analizar los paleoambientes sedimentarios y la proveniencia de los mismos. Estos comprenden bancos rojos depositados por sistemas fluviales correspondientes a la Formación Hualfin (Eoceno-Mioceno inferior? y acumulaciones clásticas, volcaniclásticas y depósitos volcánicos primarios intercalados, del Complejo Volcánico Farallón Negro (Mioceno superior- Plioceno. La asociación de facies de la Formación Hualfin está caracterizada por el desarrollo de una sucesión de formas de lecho predominantemente arenosas, en menor medida, barras gravosas conformando un sistema fluvial entrelazado arenoso poco profundo perenne. Las muestras analizadas de la Formación Hualfin corresponden a arenitas cuarzosas, derivadas principalmente del resultado de la erosión de rocas graníticas y gnéisicas con elevados porcentajes de cuarzo, que muestran proveniencias de interior cratónico y orógeno reciclado cuarzoso. El paleoambiente de los depósitos del Complejo Volcánico Farallón Negro evoluciona desde un sistema fluvial de río entrelazado distal areno dominado a uno de sistema fluvial entrelazado gravoso asociado a flujos de gravedad, para culminar en un sistema fluvial entrelazado gravoso somero. En estos depósitos se han podido diferenciar de base a techo: wackes cuarzosas, con proveniencias de orógeno reciclado que habría derivado del basamento; wackes líticas, con alto porcentaje de fragmentos líticos volcánicos de basaltos y con proveniencia de arco no disectado. Wackes feldespáticas, con altos porcentajes de plagioclasa y en menor medida clastos de andesitas, producto del cambio composicional del aporte volcánico.

  16. Procedencia de los depósitos del Grupo Payogastilla (Cenozoico, río Calchaquí, provincia de Salta

    Directory of Open Access Journals (Sweden)

    Claudia Inés Galli

    2011-06-01

    Full Text Available Se realiza el estudio de procedencias de los depósitos cenozoicos expuestos en la zona sur del valle Calchaquí, provincia de Salta que comprenden a sedimentitas fluviales del Grupo Payogastilla (Eoceno medio-Mioceno superior. La sucesión analizada se encuentra muy bien expuesta en ambas márgenes del río Calchaquí y consta de 5.400 metros de depósitos clásticos, integrada, de base a techo, por las formaciones Los Colorados, Angastaco, Palo Pintado y San Felipe. Se describen características mineralógicas, petrográficas, geoquímicas y de difracción de rayos X de las facies constituyentes de las formaciones Los Colorados, Angastaco y Palo Pintado, incorporándose el análisis de proveniencia asociado al estudio de paleocorrientes. El componente mayoritario, en las facies de areniscas, está caracterizado por granos de cuarzo, mientras que otros detritos son de: feldespatos potásicos, plagioclasas alteradas, pertitas y abundante micas. Los depósitos conglomerádicos matriz- soporte, siendo sus clastos mayoritarios de pegmatitas, granitos, cuarzos, esquistos, gneis y migmatitas. La geoquímica de elementos mayores y tierras raras de clastos de la Formación Angastaco muestran composiciones similares a la de rocas de la Faja Eruptiva de la Puna Oriental y cuerpos intrusivos ordovícicos-silúricos de Sierras Pampeanas. Los análisis de difracción de rayos X de muestras de arcillitas de la Formación Palo Pintado presentan illita y montmorillonita, que son interpretadas como de origen detrítico, mientras que la saponita ha sido generada por bisialitización (hidrólisis en un clima templado-húmedo. Las características composicionales y los datos de paleocorrientes medidos sugieren que durante el Eoceno medio al Mioceno superior el aporte principal de los materiales fue de zonas positivas de diferente composición de los afloramientos de cumbres de Luracatao y sierra de Vázquez, como así también de los cerros Runo, Durazno, sierra

  17. Recuperación del patrimonio gastronómico de la provincia de Buenos Aires

    OpenAIRE

    Nieva, Verónica L.

    2006-01-01

    Se abordan las relaciones entre gastronomía, turismo y fiestas en la provincia de Buenos Aires, con el objetivo de establecer las pautas que permitan la Recuperación del Patrimonio Gastronómico de la Provincia, diversificando la oferta turística ofrecida por los municipios que la integran. Para ello, se recurre a la compilación histórica y de recetas, que permitan entender el desarrollo de la gastronomía en la provincia de Buenos Aires, desde el habitante originario hasta los inmigrantes, inc...

  18. El recorrido al Cerro Gordo y el ritual tepehuano de las ofrendas en los cerros de la comunidad de San Bernardino de Milpillas

    Directory of Open Access Journals (Sweden)

    Chantal CRAMAUSSEL

    2014-01-01

    Full Text Available El ritual de las ofrendas es una ceremonia propiciatoria de la lluvia que se efectúa al terminar la estación seca en los cerros más altos de la comunidad de San Bernardino de Milpillas Chico, en la Sierra Tepehuana del estado de Durango. A esos rituales distintos de los cató- licos que forman parte del ciclo anual de costumbre concurren las autoridades civiles, los curanderos y miembros del Consejo de ancianos. Es un momento muy importante en el que se refuerza la cohesión de los tepehuanos que tienen un patrón de asentamiento muy disperso, como los demás grupos del norte, pero sus rituales presentan también similitudes con los mesoamericanos.

  19. Areas to explore surrounding the Cerro Prieto geothermal field, BC; Areas para exploracion en los alrededores del campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar Dumas, Alvaro [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Residencia General de Cerro Prieto, Mexicali, Baja California (Mexico)]. E-mail: alvaro.aguilar@cfe.gob.mx

    2009-07-15

    Exploration plays an important role in tapping underground natural resources-whether water, oil, natural gas or minerals. Exploratory data allow us to learn reservoir conditions, increasing probable reserves and reservoir life span. Around the Cerro Prieto geothermal field, BC, and in the Mexicali Valley in general, exploration had almost stopped but recently was resumed by the Studies Division of Comision Federal de ELectricidad (CFE)'s Gerencia de Proyectos Geotermoelectricos. The division sent technical personnel to structurally map the northern and eastern portions of Laguna Salada. The paper offers a general outline of the main zones undergoing exploratory studies-studies perhaps culminating in siting exploratory wells to locate more geothermal resources (and ultimately producing them using binary power plants). CFE also wants to site injection wells west of the current production zone, and this is covered, as well. All activities are meant to increase the productive lifespan of the geothermal reservoir. [Spanish] Cuando se trata de la explotacion de recursos naturales del subsuelo, sea agua, gas, petroleo o minerales, la exploracion juega un papel muy importante, ya que permite conocer las condiciones del yacimiento que pudieran llevar a incrementar las reservas de los recursos explotados y extender su vida util. En las zonas aledanas al campo geotermico de Cerro Prieto, BC, y en general en el Valle de Mexicali, la exploracion estaba practicamente detenida habiendose reactivado a raiz de que la Subgerencia de Estudios de la Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad (CFE) envio personal para realizar mapeos estructurales en las porciones norte y oriente de la Laguna Salada. Este trabajo presenta un panorama general de las areas prioritarias para realizar estudios exploratorios y poder programar, con mas bases, pozos exploratorios enfocados a localizar mas recursos geotermicos, inclusive para generar energia por medio

  20. Basic aspects of the Cerro Prieto reservoir water recharge; Aspectos basicos de la recarga de agua al reservorio de Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Mercado, Sergio [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1991-12-31

    The Cerro Prieto geothermal field, located 30 km South of Mexicali City, Baja California, has at present an installed capacity of 620 MW in geothermal power plants, that operating with endogenous steam, make use of the underground energy by means of deep wells, from which about 80 million cubic meters per year of high enthalpy water and steam mixture are extracted. During the exploitation physical an chemical changes in the hydrothermal fluids discharged by the wells have been detected, which shows, among other things, an elevated water recharge, located towards the West area of the field and a low recharge in the part of the east zone area. For this reason the hot brine waste re-injection is recommended, (previously treated to eliminate the silica excess) to thermally an hydraulically recharge the reservoir in that part of the field. [Espanol] El campo geotermico de Cerro Prieto, situado a 30 km al sur de la ciudad de Mexicali, Baja California, cuenta actualmente, despues de 18 anos en explotacion, con 620 MW de capacidad instalada en plantas geotermoelectricas que, operando con vapor endogeno, aprovechan la energia del subsuelo mediante pozos profundos de los que se extraen alrededor de 80 millones de metros cubicos por ano de una mezcla de agua vapor de elevada entalpia. Durante la explotacion se han percibido cambios fisicos y quimicos en los fluidos hidrotermales descargados por los pozos, lo que indica, entre otras cosas, una recarga elevada de agua localizada hacia el poniente del campo y una recarga baja en una zona de la parte oriental. Por ello se recomienda la reinyeccion de salmuera geotermica caliente de desecho (previamente tratada para eliminar el exceso de silice) para recargar termica e hidraulicamente el reservorio en esa parte del campo.

  1. Reconnaissance study of late quaternary faulting along cerro GoDen fault zone, western Puerto Rico

    Science.gov (United States)

    Mann, P.; Prentice, C.S.; Hippolyte, J.-C.; Grindlay, N.R.; Abrams, L.J.; Lao-Davila, D.

    2005-01-01

    The Cerro GoDen fault zone is associated with a curvilinear, continuous, and prominent topographic lineament in western Puerto Rico. The fault varies in strike from northwest to west. In its westernmost section, the fault is ???500 m south of an abrupt, curvilinear mountain front separating the 270- to 361-m-high La CaDena De San Francisco range from the Rio A??asco alluvial valley. The Quaternary fault of the A??asco Valley is in alignment with the bedrock fault mapped by D. McIntyre (1971) in the Central La Plata quadrangle sheet east of A??asco Valley. Previous workers have postulated that the Cerro GoDen fault zone continues southeast from the A??asco Valley and merges with the Great Southern Puerto Rico fault zone of south-central Puerto Rico. West of the A??asco Valley, the fault continues offshore into the Mona Passage (Caribbean Sea) where it is characterized by offsets of seafloor sediments estimated to be of late Quaternary age. Using both 1:18,500 scale air photographs taken in 1936 and 1:40,000 scale photographs taken by the U.S. Department of Agriculture in 1986, we iDentified geomorphic features suggestive of Quaternary fault movement in the A??asco Valley, including aligned and Deflected drainages, apparently offset terrace risers, and mountain-facing scarps. Many of these features suggest right-lateral displacement. Mapping of Paleogene bedrock units in the uplifted La CaDena range adjacent to the Cerro GoDen fault zone reveals the main tectonic events that have culminated in late Quaternary normal-oblique displacement across the Cerro GoDen fault. Cretaceous to Eocene rocks of the La CaDena range exhibit large folds with wavelengths of several kms. The orientation of folds and analysis of fault striations within the folds indicate that the folds formed by northeast-southwest shorTening in present-day geographic coordinates. The age of Deformation is well constrained as late Eocene-early Oligocene by an angular unconformity separating folDed, Deep

  2. Archaeological fieldwork in the Bronze Age site of Cerro de la Encina (Monachil, Granada

    Directory of Open Access Journals (Sweden)

    Aranda Jiménez, Gonzalo

    2005-06-01

    Full Text Available New archaeological fieldwork has been carried out from November 2003 to May 2004 in the Bronze Age site of Cerro de la Encina, due to the interest of the regional government of Andalusia in displaying the settlement for visitors. The aim of this fieldwork has been the systematic excavation of a large settlement area partially known thanks to the excavations developed at the beginning of 1980s. A first toccupation period belonging to the Argaric Culture has been documented, highlighting specially the funerary ritual characterized by individual inhumations located below dwellings. After a gap in the occupation of the settlement a new social group belonging to the Late Bronze Age Culture of Southeast of Spain inhabits the Cerro de la Encina.

    El interés de la Consejería de Cultura de la Junta de Andalucía por la musealización del yacimiento del Cerro de la Encina ha motivado el desarrollo de nuevas investigaciones arqueológicas cuya primera fase se ha desarrollado entre Noviembre de 2003 y Mayo de 2004. Los trabajos han consistido en la excavación sistemática de un área de poblado de grandes dimensiones parcialmente conocida por las investigaciones realizadas a principios de los años 80. Los resultados han sido del máximo interés documentándose un primer momento de ocupación perteneciente a la Cultura de El Argar en el que destaca su espectacular registro funerario integrado dentro de las áreas de habitación. Tras un periodo de abandono del yacimiento se produce una nueva ocupación correspondiente a una comunidad del Bronce Final del Sureste.

  3. Vitrinite reflectance geothermometry and apparent heating duration in the Cerro Prieto geothermal field

    Science.gov (United States)

    Barker, C.E.; Elders, W.A.

    1981-01-01

    Vitrinite reflectance measured in immersion oil (Ro) on kerogen extracted from hydrothermally altered mudstones in borehole M-84 at the Cerro Prieto geothermal field exhibit an increase in mean reflectance (Ro) from 0.12 per cent at 0.24 km depth to 4.1 per cent at 1.7 km depth. Downhole temperatures measured over this interval increase from about 60?? to 340??C. These Ro data plotted against temperature fall along an exponential curve with a coefficient of determination of about 0.8. Other boreholes sampled in the field show similar relationships. A regression curve calculated for temperature and Ro in borehole M-105 correctly predicts temperatures in other boreholes within the central portion of the geothermal system. The correlation between the reflectance values and logged temperature, together with consistent temperature estimates from fluid inclusion and oxygen isotope geothermometry, indicates that changes in Ro are an accurate and sensitive recorder of the maximum temperature attained. Therefore, vitrinite reflectance can be used in this geothermal system to predict the undisturbed temperature in a geothermal borehole during drilling before it regains thermal equilibrium. Although existing theoretical functions which relate Ro to temperature and duration of heating are inaccurate, empirical temperature-Ro curves are still useful for geothermometry. A comparison of temperature-Ro regression curves derived from nine boreholes within the Cerro Prieto system suggests that heating across the central portion of the field occurred penecontemporaneously, but varies near margins. Boreholes M-93 and M-94 appear to have cooled from their maximum temperatures, whereas M-3 and Prian-1 have only recently been heated. Comparison of the temperature-Ro data from the Salton Sea, California, geothermal system indicates that the duration of heating has been longer there than at the Cerro Prieto field. ?? 1981.

  4. Edad y rasgos petrográficos y geoquímicos de cuerpos subvolcánicos asignables a la Formación Cerro León, este del Macizo del Deseado, Santa Cruz

    Directory of Open Access Journals (Sweden)

    D. Guido

    2004-12-01

    Full Text Available Se presentan nuevos afloramientos de cuerpos subvolcánicos correlacionables con la Formación Cerro León en el sector oriental del Macizo del Deseado. Esta unidad aflora en dos sectores, en el bajo Leonardo y en el afloramiento Bahía Laura del Complejo Río Deseado. El primer sector presenta trece diques y un filón capa intruyendo a las sedimentitas pérmicas de la Formación La Golondrina y el segundo sector comprende tres diques que intruyen a rocas del basamento. Se trata de rocas de color gris a negro, frecuentemente alteradas, con textura microgranuda a porfírica, con fenocristales de plagioclasa, diópsido (En42 Fs11 Wo47 y en menor medida de hornblendas ricas en Mg (magnesio hastingsita, en una matriz holocristalina de textura intergranular. Son rocas subalcalinas de composiciones basalto-andesita y con afinidades calcoalcalinas. La edad Ar/Ar obtenida en una de estas muestras (180,1±1,5 Ma representa la primer determinación realizada en esta unidad y es coherente con las relaciones estratigráficas observadas para esta formación. La comparación con rocas ígneas jurásicas de la provincia geológica Macizo del Deseado, favorece la vinculación temporal y genética con el evento volcánico-piroclástico del Jurásico medio a superior (Formación Bajo Pobre y Grupo Bahía Laura. Sin embargo, la diferencia en las edades Ar/Ar, sugieren una interrupción entre el evento subvolcánico (180 Ma y el volcanismo Jurásico medio a superior (177 a 150 Ma. Se considera, preliminarmente, que los cuerpos subvolcánicos de la Formación Cerro León representarían las primeras evidencias magmáticas del rift jurásico en el Macizo del Deseado.

  5. Cerro Papayo: an astronomical, calendrical and traditional landmark in Ancient Mexico.

    Science.gov (United States)

    Galindo Trejo, J.; Aguilera, T.; Montero García, I. A.

    Cerro Papayo is a peculiar formed hill (almost perfect semisphere, 3,630 m) situated at the east side of the Valley of Mexico. According to surface reconnaissance there is on its cusp a prehispanic site and a modern shrine dedicated to the Virgin of Guadalupe. Its striking appearance and its unobstructed visibility from anyplace in the Valley were used, since preclassic up to postclassic periods, to mark at sunrise the moment of precise astronomical, calendrical and traditional events. The present work shows observational evidence from Cuicuilco, the Templo Mayor of Tenochtitlan and Tepeyacac.

  6. Numerical modeling of high-temperature deep wells in the Cerro Prieto geothermal field, Mexico

    OpenAIRE

    García, A.; F. Ascencio; Espinosa, G.; E. Santoyo; H. Gutiérrez; V. Arellano

    1999-01-01

    A numerical modeling study of three non-producing deep geothermal wells from Cerro Prieto is presented. We compute the expected production characteristics of these wells in order to determine if their inability to sustain flow was due to (i) heat loss effects in the well, (ii) the influence of production casing diameters, (iii) the transient heat loss during the first few days of well discharge, or (iv) the effect of secondary low-enthalpy inflows. A new version of the wellbore flow simulator...

  7. Two-dimensional modeling of apparent resistivity pseudosections in the Cerro Prieto region

    Energy Technology Data Exchange (ETDEWEB)

    Vega, R.; Martinez, M.

    1981-01-01

    Using a finite-difference program (Dey, 1976) for two-dimensional modeling of apparent resistivity pseudosections obtained by different measuring arrays, four apparent resistivity pseudosections obtained at Cerro Prieto with a Schlumberger array by CFE personnel were modeled (Razo, 1978). Using geologic (Puente and de la Pena, 1978) and lithologic (Diaz, et al., 1981) data from the geothermal region, models were obtained which show clearly that, for the actual resistivity present in the zone, the information contained in the measured pseudosections is primarily due to the near-surface structure and does not show either the presence of the geothermal reservoir or the granitic basement which underlies it.

  8. Goldgroup矿业公司Cerro Prieto金矿投入商业化生产

    Institute of Scientific and Technical Information of China (English)

    2016-01-01

    Goldgroup矿业公司(Goldgroup Mining Inc.)日前宣布,公司所属墨西哥Sonora地区Cerro Prieto金矿从6月1日起正式投入商业化生产。此前从2013年12月起该金矿就一直在进行小规模中试,预计2016年该金矿黄金产量将达到15000盎司。

  9. Overview of the Mexican-American cooperative program at the Cerro Prieto geothermal field

    Science.gov (United States)

    Lippmann, M. J.; Zelwer, R.

    1982-09-01

    The Lawrence Berkeley Laboratory is coordinating the US technical activities being carried out at Cerro Prieto under a five-year agreement between the US Department of Energy and the Comission Federal de Electricidad de Mexico. This agreement, signed in July 1977, is expected to expire in July 1982. Efforts are being made to continue some of the research beyond the formal termination of the agreement. A description of the program, which involves studies of geology, geophysics, hydrodynamics, subsidence, geothermal wells and reservoirs, and aquifers, is discussed.

  10. Preliminary plasma spectrometric analyses for selected elements in some geothermal waters from Cerro Prieto, Mexico

    Science.gov (United States)

    Ball, J.W.; Jenne, E.A.

    1983-01-01

    As part of a cooperative study with Dr. Alfred Truesdell, water samples collected from geothermal power production wells at Cerro Prieto, Mexico, were analyzed for selected elements by d.c. argon plasma emission spectroscopy. Spectral interferences due to the presence of high concentrations of Ca, Si, Na and K in these water affected the apparent concentration values obtained. These effects were evaluated and correction techniques were developed and applied to the analytical values. Precipitates present in the samples at the time of analysis adversely affected the accuracy, precision and interpretability of the data. (USGS)

  11. noroeste de la provincia de Neuquén, Argentina

    Directory of Open Access Journals (Sweden)

    Ricardo Gandullo

    2005-01-01

    Full Text Available Se describe la estructura y composicion florística de cuatro comunidades vegetales de los humedales del Parque Provincial Copahue (provincia de Neuquén, Argentina.El estudio se realizó de acuerdo con la metodología de la escuela fitosociológica de Zürich-Montpellier. Los humedales estudiados se distribuyen a lo largo de un gradiente altitudinal entre los 1.400 a 1.800 m s.m. (piso montano inferior. Se establece la relación de estas nuevas comunidades vegetales con los humedales del piso montano superior (1.800 a 2.300 m s.m. sobre la base de su composición florística. De la interpretación cenosistemática resultaron cuatro nuevas asociaciones y una subasociación agrupadas en la nueva alianza Juncion leusueurii.

  12. 222Radon Concentration Measurements biased to Cerro Prieto Fault for Verify its Continuity to the Northwest of the Mexicali Valley.

    Science.gov (United States)

    Lazaro-Mancilla, O.; Lopez, D. L.; Reyes-Lopez, J. A.; Carreón-Diazconti, C.; Ramirez-Hernandez, J.

    2009-05-01

    The need to know the exact location in the field of the fault traces in Mexicali has been an important affair due that the topography in this valley is almost flat and fault traces are hidden by plow zone, for this reason, the southern and northern ends of the San Jacinto and Cerro Prieto fault zones, respectively, are not well defined beneath the thick sequence of late Holocene Lake Cahuilla deposits. The purpose of this study was to verify if Cerro Prieto fault is the continuation to the southeast of the San Jacinto Fault proposed by Hogan in 2002 who based his analysis on pre-agriculture geomorphy, relocation and analysis of regional microseismicity, and trench exposures from a paleoseismic site in Laguna Xochimilco, Mexicali. In this study, four radon (222Rn) profiles were carried out in the Mexicali Valley, first, to the SW-NE of Cerro Prieto Volcano, second, to the W-E along the highway Libramiento San Luis Río Colorado-Tecate, third, to the W-E of Laguna Xochimilco and fourth, to the W-E of the Colonia Progreso. The Radon results allow us to identify in the Cerro Prieto profile four regions where the values exceed 100 picocuries per liter (pCi/L), these regions can be associated to fault traces, one of them associated to the Cerro Prieto Fault (200 pCi/L) and other related with Michoacán de Ocampo Fault (450 pCi/L). The profile Libramiento San Luis Río Colorado-Tecate, show three regions above 100 pCi/L, two of them related to the same faults. In spite of the results of the Laguna Xochimilco, site used by Hogan (2002), the profile permit us observe three regions above the 100 pCi/L, but we can associate only one of the regions above this level to the Michoacán de Ocampo Fault, but none region to the Cerro Prieto Fault. Finally in spite of the Colonia Progreso is the shortest profile with only five stations, it shows one region with a value of 270 pCi/L that we can correlate with the Cerro Prieto Fault. The results of this study allow us to think in the

  13. TEM and SEM observations of super-structures constructed in organogel systems from a combination of boronic-acid-appended bola-amphiphiles with chiral diols

    Science.gov (United States)

    Koumoto, Kazuya; Yamashita, Tadahiro; Kimura, Taro; Luboradzki, Roman; Shinkai, Seiji

    2001-03-01

    Two bola-amphiphilic α,ω-diboronic acids separated by a (CH2)11 or (CH2)12 group were synthesized. Complexation with chiral diols readily gave new amphiphiles end-capped with the chiral substituents. Some of these acted as good gelators of organic solvents. Transmission electron microscope and scanning electron microscope observations established that a variety of super-structures are created in the organogels, depending on the solvents and the structure of the chiral end-cap groups. In most cases, the fibrous aggregates, the network structure which is the driving-force for gelation, showed a helical higher-order structure reflecting the chirality of the end-cap groups. The results indicate that the combinatorial approach utilizing boronic acid functions and diol compounds is useful in creating a variety of new super-structures in the gel phase.

  14. Relación entre la potencia muscular de extremidades inferiores y tronco con la velocidad de salida de la bola en el swing de drive en golf

    OpenAIRE

    Lorena Torres Ronda; Joan Solé Fortó; Lisímaco Vallejo Cuéllar; Xavier Balius Matas

    2010-01-01

    A pesar del interés emergente en el acondicionamiento físico en el golf, se han llevado a cabo pocos estudios para valorar la relación entre la potencia mecánica y el rendimiento en golf. El objetivo de este estudio fue valorar si existía una correlación entre la velocidad de salida de la bola del swing de drive y la potencia muscular de extremidades inferiores y tronco, en un grupo de 8 golfistas (16,8 ± 1,4 años; 2,2 ± 1,8 Handicap; 63,1 ± 6,4 kg.; 172,7 ± 7,5 cm). El test incluyó medicione...

  15. El palimpsesto infrarrealista: Tras las huellas del manifiesto poético en la narrativa de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    José González

    2014-12-01

    Full Text Available En este artículo se pretende rastrear la estética y actitud del movimiento infrarrealista en las novelas de Roberto Bolaño, mostrando su particular traducción a la narrativa en clave de humor. Se le prestará especial atención a las técnicas para posicionarse en contra de la cultura institucionalizada, formando lo que Bajtín denomina una descentralización del lenguaje a favor de un plurilingüismo, donde se distinguen mundos ideológicos en las voces del discurso. Unas de estas voces representan en ocasiones instituciones de la cultura oficial y otras se posicionan en contra, haciendo para ello uso de, por ejemplo, la parodia, la ironía o la caricatura.

  16. República de expósitos, genealogías de la orfandad en 2666 de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Alberto Bejarano

    2010-10-01

    Full Text Available A través de la relectura filosófica de la novela de Roberto Bolaño 2666 (2004, se pretende repensar el concepto de república como cuerpo político “libre” en América Latina, a través del estudio del personaje Lalo Cura como figura de la orfandad (un policía, descendiente de una historia familiar de cinco generaciones de mujeres sucesivamente violadas desde 1865. El propósito es pensar la república como un régimen de la orfandad. Se concluye que la potencia de la ficción reside en reescribir permanentemente la historia, brindándonos otras perspectivas de análisis.

  17. ¿Qué es una vida? Bolaño lee a Nietzsche a través de Schwob y Borges

    Directory of Open Access Journals (Sweden)

    Alberto Bejarano

    2012-10-01

    Full Text Available El artículo se en la idea de que el género de la biografía imaginaria iniciado por Marcel Schwob se posiciona frente a la biografía histórica tradicional como un método de investigación herético-crítico que inspecciona la vida de los hombres cualquiera, subrayando el rol de la ficción sobre lo real y sus efectos. Se indaga la herencia nietzscheana y schwobiana de esta práctica y se analiza su uso y reinvención creativa en textos de Borges y de Bolaño. Al final se afirma que esta práctica hace de la literatura un ejercicio permutador de conciencias y afectos.

  18. Formación Laguna Tordillo: Volcanismo dacítico eoceno en el Macizo del Deseado, provincia de Santa Cruz

    Directory of Open Access Journals (Sweden)

    D. Guido

    2004-12-01

    Full Text Available Se determinó una nueva entidad formacional para la provincia geológica Macizo del Deseado. Se trata de rocas volcánicas melanocráticas que se presentan como dos afloramientos en inmediaciones de la laguna Tordillo, en el sector oriental del macizo del Deseado. Son lavas de color negro a rojizo, de textura porfírica con fenocristales de labradoritas (An55-57 inmersos en una pasta de textura hialocristalina, de tipo hialofítica. Además, poseen xenolitos de roca volcánica de textura glomeroporfírica con fenocristales de labradoritas (An56-59 y enstatitas (En56-Fs40-Wo4, con rebordes de reacción pigeoníticos (En44-Fs47-Wo9. Los análisis de elementos mayoritarios y traza las definen como lavas dacíticas, de tipo subalcalino y con afinidad calcoalcalina. Las relaciones estratigráficas evidencian una edad post-Jurásico superior, la cual fue confirmada mediante un fechado radimétrico K/Ar en roca total (fracción vidrio, que resultó en 40,8 ± 2,4 Ma (Eoceno. Teniendo en cuenta el marco paleogeográfico y geotectónico paleógeno para la Patagonia, se propone que estas rocas se generaron como consecuencia de un subplacado básico de magmas, posiblemente vinculados con el Basalto Cerro del Doce o unidades paleógenas correlacionables. Sin embargo, no se descarta una vinculación entre las rocas de la Formación Laguna Tordillo y las piroclastitas de la Formación o Grupo Sarmiento.

  19. Association of BoLA DRB3 alleles with variability in immune response among the crossbred cattle vaccinated for foot-and-mouth disease (FMD).

    Science.gov (United States)

    Gowane, G R; Sharma, A K; Sankar, M; Narayanan, K; Das, Biswajit; Subramaniam, S; Pattnaik, B

    2013-08-01

    Polymorphism of bovine leukocyte antigen (BoLA) DRB3 gene is being intensively investigated for potential association with economically important diseases of cattle. Accordingly, we investigated the association of DRB3 Exon 2 polymorphism as evidenced by the variation in the binding pockets with variability in immune response to inactivated trivalent (O, A and Asia1) foot and mouth disease virus (FMDV) vaccine in a closed population of crossbred cattle. Antibody titer of ≥ 1.8 was set as the cut off value to distinguish the protected (≥ 1.8) and unprotected (DRB3 alleles 0201, 0801 and 1501 always ranked high for protective immune response whereas alleles 0701, 1103 and 1101 consistently ranked low for unprotected immune response for all the three serotypes. Rank correlation of DRB3 alleles among the three serotypes was positive, high in magnitude and statistically significant (P<0.05). Logistic regression analysis revealed that odds of protection from the vaccine were highest for all the three serotypes if allele (∗)1501 was present and strengthened the results of allele ranking. Predicted amino acid substitution in the peptide binding pockets revealed that all the important sites had high Wu-Kabat index. Similarly, specific residues in pockets were crucial for immune response to FMD vaccine. There were specific substitutions in un-protected alleles such as absence of acidic amino acids substituted by basic amino acid at β71, presence of non-polar cysteine or basic histidine at β30 and presence of polar tyrosine at β37. From the observations, we hypothesize that the substitutions lead to unique conformational changes in the protein products of the studied alleles that would associate with the protective or unprotective antibody response to FMDV vaccine. The knowledge has potential implications in future selection programs if integrated with the complete BoLA haplotype details and production traits of the herd.

  20. A first shallow firn-core record from Glaciar La Ollada, Cerro Mercedario, central Argentine Andes

    Science.gov (United States)

    Bolius, David; Schwikowski, Margit; Jenk, Theo; Gäggeler, Heinz W.; Casassa, Gino; Rivera, Andrés

    In January 2003, shallow firn cores were recovered from Glaciar Esmeralda on Cerro del Plomo (33°14‧ S, 70°13‧ W; 5300 ma.s.l.), central Chile, and from Glaciar La Ollada on Cerro Mercedario (31°58‧ S, 70°07‧ W; 6070 ma.s.l.), Argentina, in order to find a suitable archive for paleoclimate reconstruction in a region strongly influenced by the El Niño-Southern Oscillation. In the area between 28° S and 35° S, the amount of winter precipitation is significantly correlated to the Southern Oscillation Index, with higher values during El Niño years. Glaciochemical analysis indicates that the paleo-record at Glaciar La Ollada is well preserved, whereas at Glaciar Esmeralda the record is strongly influenced by meltwater formation and percolation. A preliminary dating of the Mercedario core by annual-layer counting results in a time-span of 17 years (1986-2002), yielding an average annual net accumulation of 0.45 m w.e.

  1. Optical Sky Brightness at Cerro Tololo Inter-American Observatory from 1992 to 2006

    CERN Document Server

    Krisciunas, Kevin; Sanhueza, Pedro; Schwarz, Hugo E; Semler, Dylan R; Suntzeff, Nicholas B; Vera, Sergio

    2007-01-01

    We present optical UBVRI sky brightness measures from 1992 through 2006. The data are based on CCD imagery obtained with the CTIO 0.9-m, 1.3-m, and 1.5-m telescopes. The B- and V-band data are in reasonable agreement with measurements previously made at Mauna Kea, though on the basis of a small number of images per year there are discrepancies for the years 1992 through 1994. Our CCD-based data are not significantly different than values obtained at Cerro Paranal. We find that the yearly averages of V-band sky brightness are best correlated with the 10.7-cm solar flux taken 5 days prior to the sky brightness measures. This implies an average speed of 350 km/sec for the solar wind. While we can measure an enhancement of the night sky levels over La Serena 10 degrees above the horizon, at elevation angles above 45 degrees we find no evidence that the night sky brightness at Cerro Tololo is affected by artificial light of nearby towns and cities.

  2. Cerro de Pasco and other massive sulfide deposits of central Peru

    Energy Technology Data Exchange (ETDEWEB)

    Cheney, E.S.

    1985-01-01

    The famous Cerro de Pasco Pb-Zn-Ag deposit historically has been considered to be hydrothermally derived from an adjacent Tertiary volcanic vent. However, texturally massive pyrite-chert and pyrite-sphalerite-galena in the deposit have the same strike and cross folds as the adjacent pre-Tertiary strata. Both the deposit and the strata are cut by one of the large Longitudinal Faults. Both dikes and pyrite-enargite veins associated with the vent cut the massive sulfides; fragments of massive pyrite occur in the vent. A few examples of laminated pyrite and chert, banded pyrite and chert, banded pyrite and sphalerite, and banded pyrite, sphalerite, and galena are preserved in the massive sulfide portion of the deposit. The deposit has the composition and zoning patterns typical of shale-hosted massive sulfides. Cerro de Pasco probably in part of the pelitic Devonian Excelsior formation. The Colquijirca deposit 8 km to the south and the San Cristobal district 110 km to the south likewise have been considered to be Tertiary volcanic hydrothermal deposits. Colquijirca consists of stratigraphically controlled mantos of layered pyrite, chert and tuff in the Tertiary Calera formation. The mantos of the San Cristobal district are along the upper contact of the pyritic, Permian, Catalina felsic volcanic rocks; some ore consists of laminated pyrite and sphalerite. Tertiary plutons are conspicuously absent at San Cristobal, and the ores are brecciated by Tertiary folding.

  3. Reservoir Simulation on the Cerro Prieto Geothermal Field: A Continuing Study

    Energy Technology Data Exchange (ETDEWEB)

    Castaneda, M.; Marquez, R.; Arellano, V.; Esquer, C.A.

    1983-12-15

    The Cerro Prieto geothermal field is a liquid-dominated geothermal reservoir of complex geological and hydrological structure. It is located at the southern end of the Salton-Mexicali trough which includes other geothermal anomalies as Heber and East Mesa. Although in 1973, the initial power plant installed capacity was 75 MW of electrical power, this amount increased to 180 MW in 1981 as field development continued. It is expected to have a generating capacity of 620 MW by the end of 1985, when two new plants will be completely in operation. Questions about field deliverability, reservoir life and ultimate recovery related to planned installations are being presently asked. Numerical modeling studies can give very valuable answers to these questions, even at the early stages in the development of a field. An effort to simulate the Cerro Prieto geothermal reservoir has been undergoing for almost two years. A joint project among Comision Federal de Electricidad (CFE), Instituto de Investigaciones Electricas (IIE) and Intercomp of Houstin, Texas, was created to perform reservoir engineering and simulation studies on this field. The final project objective is tosimulate the behavior of the old field region when production from additional wells located in the undeveloped field zones will be used for feeding the new power plants.

  4. Analysis of heavy oils: Method development and application to Cerro Negro heavy petroleum

    Energy Technology Data Exchange (ETDEWEB)

    Carbognani, L.; Hazos, M.; Sanchez, V. (INTEVEP, Filial de Petroleos de Venezuela, SA, Caracas (Venezuela)); Green, J.A.; Green, J.B.; Grigsby, R.D.; Pearson, C.D.; Reynolds, J.W.; Shay, J.Y.; Sturm, G.P. Jr.; Thomson, J.S.; Vogh, J.W.; Vrana, R.P.; Yu, S.K.T.; Diehl, B.H.; Grizzle, P.L.; Hirsch, D.E; Hornung, K.W.; Tang, S.Y.

    1989-12-01

    On March 6, 1980, the US Department of Energy (DOE) and the Ministry of Energy and Mines of Venezuela (MEMV) entered into a joint agreement which included analysis of heavy crude oils from the Venezuelan Orinoco oil belt.The purpose of this report is to present compositional data and describe new analytical methods obtained from work on the Cerro Negro Orinoco belt crude oil since 1980. Most of the chapters focus on the methods rather than the resulting data on Cerro Negro oil, and results from other oils obtained during the verification of the method are included. In addition, published work on analysis of heavy oils, tar sand bitumens, and like materials is reviewed, and the overall state of the art in analytical methodology for heavy fossil liquids is assessed. The various phases of the work included: distillation and determination of routine'' physical/chemical properties (Chapter 1); preliminary separation of >200{degree}C distillates and the residue into acid, base, neutral, saturated hydrocarbon and neutral-aromatic concentrates (Chapter 2); further separation of acid, base, and neutral concentrates into subtypes (Chapters 3-5); and determination of the distribution of metal-containing compounds in all fractions (Chapter 6).

  5. Elemental analysis of pottery from Cerro de las Ventanas, Zacatecas, by INAA

    Energy Technology Data Exchange (ETDEWEB)

    Lopez del Rio, H.; Mireles G, F. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Mendez C, R. Y. [Universidad Autonoma de Zacatecas, Unidad Academica de Antropologia, Apdo. Postal 555 Suc. C, Zacatecas (Mexico); Nicolas C, M. [Universidad Autonoma de San Luis Potosi, Coordinacion de Ciencias Sociales y Humanidades, Av. Industrias 101-A, Fracc. Talleres, 78494 San Luis Potosi (Mexico); Speakman, R. J. [Museum Conservation Institute, Smithsonian Institution, Suitland, 20746 Maryland (United States); Glascock, M. D. [Reactor Center, University of Missouri, Columbia, 65211 Missouri (United States)

    2009-10-15

    Fifteen ceramic fragments samples from Cerro de las Ventanas site, Zacatecas, were analyzed by instrumental neutron activation analysis. Thirty-two elements were measured: Al, As, Ba, Ca, Ce, Co, Cr, Cs, Dy, Eu, Fe, Hf, K, La, Lu, Mn, Na, Nd, Rb, Sb, Sc, Sm, Sr, Ta, Tb, Ti, Th, U, V, Yb, Zn, and Zr. Cluster analysis and principal component analysis were performed on the dataset to examine similarities between samples and to establish compositional groups. The statistical analyses of the dataset suggest that the pottery samples form a unique chemically homogeneous group, with the exception of one pottery sample. The compositional data were compared to an existing Meso american ceramic database. It was found that the newly generated data fit best with data from a previous chemical analysis of pottery from the Mal paso Valley. However, despite the apparent similarity, pottery samples from the site of Cerro de las Ventanas represent a new and unique chemical fingerprint in the region. (Author)

  6. SITE CHARACTERISTICS OF THE SUMMIT OF CERRO CHAJNANTOR AT THE 5640 M ALTITUDE

    Directory of Open Access Journals (Sweden)

    K. Motohara

    2011-01-01

    Full Text Available Instituto de Astronomía de la Universidad de Tokio está promoviendo el proyecto TAO (University of Tokyo Atacama Observatory; Yoshii et al. 2010 para construir un telescopio infrarrojo en la cima de Cerro Chajnantor (altitud 5640 m en el desierto de Atacama en el Norte de Chile. Para la evaluación de las características del sitio, primero se realizó el monitoreo del tiempo atmosférico, la emisividad de nubes y el seeing durante 2006. 2007. La fracción despejada fue alta (>80% y la mediana del seeing en la banda V fue de tan solo 0."69. Un telescopio explorador de 1 m llamado miniTAO fue instalado y comenzó a observar en 2009. Con éste se han obtenido imágenes satisfactorias de Paα de hidrógeno 1.875 μm como también imágenes de 30.40 μm por primera vez desde un telescopio en tierra. Estos resultados demuestran que la cima de Cerro Chajnantor es uno de los mejores sitios para la astronomía infrarroja en la Tierra.

  7. Cerro Negro field, Venezuela: geological images from a high resolution 3-D survey

    Energy Technology Data Exchange (ETDEWEB)

    Woller, Kevin L. [Mobil Technology Co. (WEC)

    1999-07-01

    Following a pilot 3-D survey, Petrolera Cerro Negro acquired and processed a 3-D dynamite survey over the Cerro Negro Field in Venezuela. We designed the survey to achieve high frequency imaging at the relatively shallow (< 1000 m) objectives in the Morichal formation. The data exhibits usable frequencies in the 10-120 Hz range after migration. The results of the survey have satisfied the original objective of imaging the faults and basement structure in the field. Use of continuity measurements on the data has resulted in a photographic quality image of the faults at the basement level. The pattern of the faults indicates an unexpected degree of complexity, indicating a richer structural history than originally thought. The continuity data also shows depositional details in the Morichal, which in accordance with geological history of the area. The operatorship is currently in the process of drilling many horizontal development wells. The patterns of the wells bores and variations in the rock types present a challenge to the usage of the 3-D seismic. The operatorship is working to raise the understanding and utility of the seismic data to another plateau. (author)

  8. Presence of cross flow in the Cerro Prieto geothermal field, BC; Presencia de flujo cruzado en el campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Rodriguez, Marco Helio [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Residencia General de Cerro Prieto, Mexicali, Baja California (Mexico)]. E-mail: marco.rodriguez01@cfe.gob.mx

    2011-01-15

    During the development of Cerro Prieto geothermal field, BC, exploitation has increased gradually, causing a continuous drop in pressure to almost 100 bars in the central and eastern parts of the field. This has occurred despite the high natural recharge induced by the reservoir exploitation and helped by the high permeability of the reservoir and the wide availability of natural recharge of low-temperature water in the vicinity. The strata above the production zones have significantly lower temperatures than these zones, but due to the particular characteristics of the reservoir, do not have pressure drops. As the pressure of producing strata declines, the hydraulic pressure differential between them and the overlying strata increases. Thus in recent years the phenomenon of cross flow occurs with greater frequency and severity. In this paper, this phenomenon is analyzed, detailing the specific mechanisms favoring it and identifying the stage (drilling or workover) in which it commonly occurs. Rigorous supervision during these stages is crucial to identifying cross flow and to taking necessary measures to save the well. Cross flow cases are presented at different stages in the history of a well: during drilling, repair, before and during the stimulation, and during production. [Spanish] Durante el desarrollo del campo geotermico de Cerro Prieto, BC, la explotacion se ha incrementado en forma gradual provocando una continua caida de presion, que en las porciones central y oriente ha sido de casi 100 bars. Esto ha ocurrido a pesar de la enorme recarga natural inducida por la explotacion, favorecida por la alta permeabilidad del yacimiento y la gran disponibilidad de recarga natural de agua de baja temperatura en los alrededores del mismo. Los estratos ubicados encima de las zonas productoras presentan temperaturas significativamente menores que estos, pero debido a las caracteristicas particulares del yacimiento, no han presentado abatimiento en su presion. En la

  9. Cerámica común tardorromana, imitación de sigillata, en la provincia de Segovia. Aproximación al estudio de las producciones cerámicas del siglo V en la Meseta Norte y su transición al mundo hispano-visigodo

    Directory of Open Access Journals (Sweden)

    Juan Tovar, Luis Carlos

    1997-12-01

    Full Text Available The Vth century A.D. is possibly the least known period of Roman Hispania, especially as far as its material culture is concerned: town planning, architecture, pottery, metalwork, glass, and so on. In this paper we tackle a particular area of that material culture within a specific region: the common pottery (table and kitchen ware, imitation of the terra sigillata, in the Segovia province. Our essential aim has been to define its technical, typological and decorative characteristics, as well as the features it bears in common with the terra sigillata, and its significance in the origin of Hispanic-Visigothic pottery. In order to do so, we have taken into account ceramics from towns such as Cauca, Cerro del Castillo (in Bernardos or Cerro de la Virgen de Tormejón (in Armuña, as well as rural settlements (villae rusticae?, burying grounds (El Cantosal, Aguilafuente, Duratón, etc., and single findings.De la Hispania romana tal vez el periodo más desconocido sea el siglo V, sobre todo en los aspectos referidos a sus restos materiales: urbanismo, arquitectura, cerámica, metalistería, vidrio, etc. En este trabajo hemos abordado una parte concreta de esta cultura material en una zona determinada: la cerámica común (tanto de mesa, como de cocina, imitación de sigillata, en la provincia de Segovia. Definir sus características técnicas, tipológicas, decorativas, así como su similitud con la terra sigillata y su significado en la formación de la cerámica hispano-visigoda, ha sido nuestro objetivo básico. Para ello, hemos tenido en cuenta tanto cerámica proveniente de núcleos urbanos como Cauca, el Cerro del Castillo (en Bernardos o el Cerro de la Virgen de Tormejón (en Armuña, como de asentamientos rurales (¿villae rusticae?, necrópolis (El Cantosal, Aguilafuente, Duratón, etc. y hallazgos aislados.

  10. Minimal thermodynamic conditions in the reservoir to produce steam at the Cerro Prieto geothermal field, BC; Condiciones termodinamicas minimas del yacimiento para producir vapor en el campo geotermico de Cerro Prieto, B.C.

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Rodriguez; Marco Helio [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Residencia General de Cerro Prieto, Mexicali, Baja California (Mexico)]. E-mail: marco.rodriguez01@cfe.gob.mx

    2009-01-15

    Minimal thermodynamic conditions in the Cerro Prieto geothermal reservoir for steam production are defined, taking into account the minimal acceptable steam production at the surface, considering a rank of mixed-enthalpies for different well-depths, and allowing proper assessments for the impacts of the changes in fluid reservoir pressure and enthalpy. Factors able to influence steam production are discussed. They have to be considered when deciding whether or not to drill or repair a well in a particular area of the reservoir. These evaluations become much more relevant by considering the huge thermodynamic changes that have occurred at the Cerro Prieto geothermal reservoir from its development, starting in 1973, which has lead to abandoning some steam producing areas in the field. [Spanish] Las condiciones termodinamicas minimas del yacimiento geotermico de Cerro Prieto, BC, para producir vapor se determinan tomando en cuenta la minima produccion de vapor aceptable en superficie, considerando un rango de entalpias de la mezcla y para diferentes profundidades de pozos, lo que permite valorar adecuadamente el impacto de la evolucion de la presion y entalpia del fluido en el yacimiento. Se discuten los factores que pueden afectar la produccion de vapor, los cuales se deben tomar en cuenta para determinar la conveniencia o no de perforar o reparar un pozo en determinada zona del yacimiento. Estas evaluaciones adquieren gran relevancia al considerar los enormes cambios termodinamicos que ha presentado el yacimiento geotermico de Cerro Prieto, como resultado de su explotacion iniciada en 1973, lo que ha llevado a abandonar algunas zonas del campo para la produccion de vapor. Palabras Clave: Cerro Prieto, entalpia, evaluacion de yacimientos, politicas de explotacion, presion, produccion de vapor.

  11. Extension of the Cerro Prieto field and zones in the Mexicali Valley with geothermal possibilities in the future

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca L, H.L.; de la Pena L, A.; Puente C, I.; Diaz C, E.

    1981-01-01

    This study concerns the possible extension of the Cerro Prieto field and identification of other zones in the Mexicali Valley with geothermal development potential by assessing the structural geologic conditions in relation to the regional tectonic framework and the integration of geologic and geophysical surveys carried out at Cerro Prieto. This study is based on data obtained from the wells drilled to date and the available geological and geophysical information. With this information, a geologic model of the field is developed as a general description of the geometry of what might be the geothermal reservoir of the Cerro Prieto field. In areas with geothermal potential within the Mexicali Valley, the location of irrigation wells with anomalous temperatures was taken as a point of departure for subsequent studies. Based on this initial information, gravity and magnetic surveys were made, followed by seismic reflection and refraction surveys and the drilling of 1200-m-deep multiple-use wells. Based on the results of the final integration of these studies with the geology of the region, it is suggested that the following areas should be explored further: east of Cerro Prieto, Tulecheck, Riito, Aeropuerto-Algodones, and San Luis Rio Colorado, Sonora.

  12. Monitoreo de DDI en la provincia de Formosa (2003

    Directory of Open Access Journals (Sweden)

    J.L. Atencia

    2007-06-01

    Full Text Available Un total de 691 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos localidades de la provincia de Formosa: ciudad de Formosa (299 niños y Clorinda (392 niños. La edad de los escolares osciló entre 5 y 16 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-15, se tomó como única referencia la palpación de H.N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (152 de la ciudad de Formosa y 154 de Clorinda. Se recogieron 139 muestras de sal de consumo hogareño de Formosa y 371 de Clorinda. El examen palpatorio de los niños reveló la existencia de bocio grado 1, con excepción de un niño de Clorinda que tuvo un nódulo único en una glándula cuyo resto era palpatoriamente normal. La prevalencia de bocio encontrada fue de 17,7 % en la ciudad de Formosa y de 13 % en Clorinda. Los niveles de yoduria alcanzaron, en la ciudad de Formosa, una media de 128±13,2 (DS µg/L y una mediana de 92 µg/L, al tiempo que en Clorinda la media fue de 193±14,7 µg/L y la mediana de 155 µg/L. El contenido de yodo de las sales que aportaron los alumnos, si bien varió según la marca de sal utilizada, tuvieron un nivel adecuado de yodo en aquellas de consumo masivo. De esta manera, observamos que en la ciudad de Formosa el promedio de yodo en la sal, tomada en conjunto, fue de 25,2±9,1mg/Kg, mientras que para Clorinda fue de 27,89±10,1mg/Kg. Al analizar las concentraciones de yodo <15mg/Kg, observamos que fue del 15,6 % en Formosa y del 10,9 % en Clorinda. Teniendo en cuenta la línea de corte del 10 % que fija el ICCIDD (16 como valor óptimo, podemos observar que la cifra

  13. Monitoreo de DDI en la provincia de La Rioja (2006

    Directory of Open Access Journals (Sweden)

    Mónica L Milani

    2010-04-01

    Full Text Available Un total de 712 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos localidades de la provincia de La Rioja: Ciudad de La Rioja (442 niños y Chilecito (270 niños. La edad de los escolares osciló entre 5 y 16 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-24, se tomó como única referencia la palpación de H.N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (125 de La Rioja y 128 de Chilecito. Se recolectaron 251 muestras de sal de consumo hogareño de La Rioja y 141 de Chilecito, para medir su contenido en yodo. El examen palpatorio de los niños reveló la existencia de bocio grado 1 solamente. La prevalencia de bocio encontrada fue de 1,8% en La Rioja y de 2,6% en Chilecito. Los niveles de yoduria alcanzaron, en La Rioja, una media de 226 ± 181 (DS μg/L y una mediana de 186μg/L, al tiempo que en Chilecito la media fue de 217 ± 161μg/L y la mediana de 185μg/L. El contenido de yodo de las sales, que aportaron los alumnos desde sus hogares, fue adecuado para casi todas las marcas. De esta manera, observamos que en la ciudad de La Rioja el promedio de yodo en la sal, tomada en conjunto, fue de 33,1 ± 12,5 mg/Kg, mientras que para Chilecito fue de 28,1 ± 8,2 mg/Kg. Al analizar las concentraciones de yodo <15mg/Kg, observamos que fue del 10,7% en La Rioja y del 9,5% en Chilecito. Teniendo en cuenta la línea de corte del 10% que fija el ICCIDD (25 como valor óptimo, podemos observar que la situación fue prácticamente satisfactoria en ambas poblaciones. Concluímos que en estas dos poblaciones de la provincia de La Rioja no existe, actualmente, bocio

  14. Epidemiologia del tumore della mammella in provincia di Cremona

    Directory of Open Access Journals (Sweden)

    L. Iacuzio

    2003-05-01

    Full Text Available

    Introduzione: nei paesi industrializzati il carcinoma mammario è, per incidenza e mortalità, al primo posto tra i tumori maligni della popolazione femminile. Nella presente nota vengono analizzati i profili epidemiologici della patologia in provincia di Cremona nel periodo 1999 - 2002. Metodologia. La popolazione in studio, ottenuta mediante record linkage, è costituita dalla donne ricoverate/decedute con diagnosi di neoplasia mammaria (ICD 174.x o di carcinoma in situ (ICD 2330. Verificata la partecipazione allo screening aziendale. I dati sono stati elaborati con il package EPI INFO.

    Risultati: arruolate complessivamente 1771 “nuove” pazienti (24 per carcinoma in situ; la prevalenza annua è di 255.6 x100.000, la mortalità di 53 x 100.000. Il distretto sanitario di Cremona presenta oltre il 50% dei casi. L’età media, di 56 anni per i carcinomi in situ, si eleva a 64 nei ricoveri per forme invasive (range 26 97 e a 68 anni nei decessi; il 16% delle ricoverate e l’11% delle decedute ha meno di 50 anni (limite inferiore dello screening di popolazione. 161 pazienti avevano partecipato, precedentemente al ricovero, allo screening aziendale con riscontro positivo in 138 casi (sensibilità 85.7%. Non si registra un incremento significativo, nel biennio di applicazione dello screening (2001 2002, dei pazienti ricoverati rispetto al biennio precedente

    Conclusioni: i nostri dati confermano la rilevanza della patologia anche in provincia di Cremona. La brevità del periodo in studio non consente conclusioni circa l’impatto dell’indagine di massa sull’andamento di ricoveri e mortalità. Complessivamente, solo il 46% delle ricoverate/decedute rientra nella fascia di età dello screening ed interrogativi pongono sia la notevole quota di giovani (la neoplasia mammaria è la prima causa di mortalità neoplastica al di sotto dei 50 anni sia il numero di donne nella fascia 70

  15. Geología de la región del Cerro Guanaquero, Río Diamante, Mendoza Geology of Cerro Guanaquero region, Diamante River, Mendoza

    Directory of Open Access Journals (Sweden)

    Federico Fuentes

    2008-03-01

    Full Text Available El estudio realizado presenta nuevos datos sobre un sector poco conocido de la Cordillera Principal de Mendoza, en la alta cuenca del río Diamante en las adyacencias del cerro Guanaquero, y los primeros datos geocronológicos de sus rocas volcánicas. Las unidades geológicas presentes en el área se dividen en cuatro grupos principales: secuencias sedimentarias mesozoicas marinas y continentales intensamente plegadas y falladas; intrusivos y volcanitas intermedias de edad neógena; rocas volcánicas pliocenas a recientes de composición intermedia a básica, y depósitos cuaternarios inconsolidados. El cerro Guanaquero, un estratovolcán pliocuaternario intensamente erosionado por glaciares pleistocenos, con sus 4.841 metros es el rasgo orográfico más prominente. Está constituido esencialmente por andesitas grises porfíricas, piroxénicas a biotíticas. Intercaladas con las coladas andesíticas se presentan depósitos piroclásticos, aglomerados volcánicos, ignimbritas y basaltos. La datación de una andesita por el método K-Ar en roca total arrojó una edad de 1,4 ± 0,1 Ma. La deformación ándica comenzó en forma de una faja plegada y corrida de piel fina, con pliegues por despegue en el sector occidental y por propagación de falla en el oriental. La compresión al oeste de los 69º47´O terminó por invertir la fallas normales del rift mesozoico. A lo largo de este meridiano se encuentra la falla más importante de la región, la que se ha correlacionado con la falla Malargüe, bien desarrollada en latitudes más australes. Esta falla limita la faja plegada y corrida del Aconcagua, de naturaleza epidérmica, y la faja plegada y corrida de Malargüe, controlada por la inversión tectónica del basamento. El volcanismo fue muy intenso en el Plioceno y el Cuaternario, correspondiendo a un período de empinamiento de la placa oceánica subducida, en el que la región ha sido levantada pasivamente. La alta resistencia a la erosión de

  16. Estudo comparativo entre exercícios com dinamômetro isocinético e bola terapêutica na lombalgia crônica de origem mecânica

    OpenAIRE

    Freitas,Cíntia Domingues de; Greve,Júlia Maria D'Andrea

    2008-01-01

    O objetivo foi avaliar os efeitos dos exercícios de fortalecimento de tronco sobre a dor lombar crônica de origem mecânica e comparar o uso do dinamômetro isocinético e da bola terapêutica. Dezenove pacientes com dor lombar crônica foram distribuidos randomicamente em dois grupos, para fortalecimento do tronco: grupo bola (5 homens e 5 mulheres, idade média 31,2±8,2) e grupo dinamômetro (2 homens e 7 mulheres, idade média 37,9±11,2). Os grupos foram tratados em duas sessões semanais, por três...

  17. Caracterización metalúrgica de diversas bolas de cañón procedentes de las fábricas de armas de Orbaiceta y Eugi

    OpenAIRE

    Ajona Izal, Samuel

    2015-01-01

    En el presente Trabajo de Fin de Grado, se ha realizado el estudio de varias bolas de fundición de hierro procedentes de las antiguas Reales Fábricas de armas y municiones de Orbaiceta y Eugi (Navarra). Para ello se ha llevado a cabo la preparación, observación y análisis metalográfico de las muestras. Con ello, se ha procedido realizar una comparación de ambas bolas: microestructura, diferencia de fases, etc. Se ha llevado a cabo un análisis de su composición química y un análisis por micros...

  18. Microfaunal evidence of age and depositional environments of the Cerro Prieto section (Plio-Pleistocene), Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Ingle, J.C. Jr.

    1982-01-01

    Microfossils including benthic and planktic foraminifera, ostracodes, calcareous algae, fish skeletal material, and fragments of pelecypods were found in 14 core samples from depths of 185 to 1952 m in the Cerro Prieto geothermal field, providing evidence of both the age and depositional history of sediments comprising the 3000-m-thick Pliocene and Pleistocene section in this area. Ostracodes of brackish water and marine origin constitute the most common microfossils present in this sequence occurring in 8 samples; in situ littoral and neritic species of benthic foraminifera occur in 5 samples with planktic species present in 2 samples. Distributional patterns of ostracodes and foraminifera together with previously analyzed lithofacies (Lyons and van de Kamp, 1980) indicate that the Cerro Prieto section represents an intertonguing complex of alluvial, deltaic, estuarine, and shallow marine environments deposited along the front of the Colorado River delta as it prograded across the Salton Trough during Pliocene and Pleistocene time. Foraminiferal evidence indicates that a sand and shale unit commonly present at depths between 700 and 1100 m represents a significant mid-Pleistocene marine incursion in the Cerro Prieto area. Tentative correlation of the Cerro Prieto section with the well dated Palm Springs Formation of the Imperial Valley, California area suggests that the Pliocene/Pleistocene boundary occurs at a depth of approximately 2000 m in the area of well M-93. Reworked specimens of Cretaceous foraminifera and fragments of the Cretaceous pelecypod Inoceramus were found in five samples further substantiating the Colorado Plateau provenance of a significant portion of the Colorado River deltaic sediments in the Cerro Prieto area.

  19. Arterial oxygen saturation in healthy newborns delivered at term in Cerro de Pasco (4340 m and Lima (150 m

    Directory of Open Access Journals (Sweden)

    Gonzales Gustavo F

    2005-09-01

    Full Text Available Abstract Background High altitude is associated with both low pulse oxygen saturation at birth and more pre-term deliveries. The present study was performed to determine pulse oxygen saturation in newborns at term in Cerro de Pasco (4340 m and Lima (150 m to test the hypothesis that low pulse oxygen saturation at birth at high altitudes was not observed at term deliveries. Methods The present study was designed to determine pulse oxygen saturation values through 1 minute to 24 hours and values of Apgar score at 1 and 5 minutes in newborns delivered at term in Cerro de Pasco (4340 m and Lima (150 m. Pulse oxygen saturation was recorded in 39 newborns from Cerro de Pasco (4340 m and 131 from Lima (150 m at 1, 2, 3, 4, 5, 10, 15, 30 minutes and 1, 2, 8 and 24 hours after delivery. Apgar score was assessed at 1 and 5 minutes after birth. Neurological score was assessed at 24 h of birth by Dubowitz exam. Results Pulse oxygen saturation increased significantly from 1 to 15 min after birth at sea level and from 1 to 30 minutes at Cerro de Pasco. Thereafter, it increased slightly such that at 30 min at sea level and at 60 minutes in Cerro de Pasco it reached a plateau up to 24 hours after birth. At all times, pulse oxygen saturation was significantly higher at sea level than at high altitude (P Conclusion From these analyses may be concluded that pulse oxygen saturation at 4340 m was significantly low despite the fact that births occurred at term. Apgar scores at first minute and neurological scores were also lower at high altitudes.

  20. Role of bolA and rpoS genes in biofilm formation and adherence pattern by Escherichia coli K-12 MG1655 on polypropylene, stainless steel, and silicone surfaces.

    Science.gov (United States)

    Adnan, Mohd; Sousa, Ana Margarida; Machado, Idalina; Pereira, Maria Olivia; Khan, Saif; Morton, Glyn; Hadi, Sibte

    2016-11-15

    Escherichia coli has developed sophisticated means to sense, respond, and adapt in stressed environment. It has served as a model organism for studies in molecular genetics and physiology since the 1960s. Stress response genes are induced whenever a cell needs to adapt and survive under unfavorable growth conditions. Two of the possible important genes are rpoS and bolA. The rpoS gene has been known as the alternative sigma (σ) factor, which controls the expression of a large number of genes, which are involved in responses to various stress factors as well as transition to stationary phase from exponential form of growth. Morphogene bolA response to stressed environment leads to round morphology of E. coli cells, but little is known about its involvement in biofilms and its development or maintenance. This study has been undertaken to address the adherence pattern and formation of biofilms by E. coli on stainless steel, polypropylene, and silicone surfaces after 24 h of growth at 37 °C. Scanning electron microscopy was used for direct examination of the cell attachment and biofilm formation on various surfaces and it was found that, in the presence of bolA, E. coli cells were able to attach to the stainless steel and silicone very well. By contrast, polypropylene surface was not found to be attractive for E. coli cells. This indicates that bolA responded and can play a major role in the presence and absence of rpoS in cell attachment.

  1. Vivienda y transformaciones de habitabilidad en la Provincia de Arauco

    Directory of Open Access Journals (Sweden)

    Juan Pablo Gramsch Labra

    2015-04-01

    La tercera pregunta, está planteada en función de las infraestructuras higiénicas y de complemento sanitario a la habitabilidad de las familias en sus viviendas, la calidad y disponibilidad de su agua potable, de su alcantarillado, y de la electricidad. Por último, en la cuarta pregunta relacionada, se revisan los avances de la provincia en equipamientos complementarios al interior de las viviendas, de cómo ha evolucionado la calidad y disponibilidad de los artefactos con que cuentan las familias al interior de los hogares, algunos de ellos de gran trascendencia en la calidad de la habitabilidad que estas familias puedan lograr y otros factores adicionales como disponibilidad de Internet y teléfonos celulares, más relacionados con su capacidad de conectarse al resto de la región y del mundo.

  2. Provincia de Concepción -– Chile

    Directory of Open Access Journals (Sweden)

    Aracelly Godoy Bustos

    2007-01-01

    Full Text Available El propósito del estudio fue explorar en la percepción que tienen de su calidad de vida las familias usuarias de la política habitacional chilena, específicamente las que han optado por programas a partir de los cuales las familias de escasos recursos acceden a una vivienda con un ahorro previo, adquiriendo una vivienda “sin deuda”, pasando a ser propietarios de éstas.1 A partir del año 2002 se implementa la nueva política habitacional, incorporando, los programas Fondo Solidario de Vivienda y Vivienda Social Dinámica sin Deuda. En este contexto, se entrevistó a 136 familias de 4 comunas de la provincia de Concepción, estableciendo para conocer su calidad de vida, 4 campos que la conformarían: físico, humano, natural y sociocultural. Así, surge la pregunta respecto de si la Política Habitacional efectivamente está contribuyendo a mejorar la calidad de vida, al proceso de superación de la pobreza y generación de redes de asociatividad entre las familias. De esta forma, y a partir de la implementación de una metodología cuantitativa, se logró un acercamiento a la realidad de “los con techo propio”.

  3. Hydrothermal alteration of sediments associated with surface emissions from the Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Valette-Silver, J.N.; Esquer P., I.; Elders, W.A.; Collier, P.C.; Hoagland, J.R.

    1981-01-01

    A study of the mineralogical changes associated with these hydrothermal vents was initiated with the aim of developing possible exploration tools for geothermal resources. The Cerro Prieto reservoir has already been explored by extensive deep drilling so that relationships between surface manifestations and deeper hydrothermal processes could be established directly. Approximately 120 samples of surface sediments were collected both inside and outside of the vents. The mineralogy of the altered sediments studied appears to be controlled by the type of emission. A comparison between the changes in mineralogy due to low temperature hydrothermal activity in the reservoir, seen in samples from boreholes, and mineralogical changes in the surface emission samples shows similar general trends below 180 C: increase of quartz, feldspar and illite, with subsequent disappearance of kaolinite, montmorillonite, calcite and dolomite. These mineral assemblages seem to be characteristic products of the discharge from high intensity geothermal fields.

  4. Comments on some of the drilling and completion problems in Cerro Prieto geothermal wells

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez A, B.; Sanchez G, G.

    1981-01-01

    From 1960 to the present, 85 wells with a total drilling length exceeding 160,000 m have been constructed at Cerro Prieto, a modest figure compared to an oil field. This activity took place in five stages, each characterized by changes and modifications required by various drilling and well-completion problems. Initially, the technical procedures followed were similar to those used in the oil industry. However, several problems emerged as a result of the relatively high temperatures found in the geothermal reservoir. The various problems that have been encountered can be considered to be related to drilling fluids, cements and cementing operations, lithology, geothermal fluid characteristics, and casings and their accessories. As the importance of high temperatures and the characteristics of the geothermal reservoir fluids were better understood, the criteria were modified to optimize well-completion operations, and satisfactory results have been achieved to date.

  5. Isotopic changes in the fluids of the Cerro Prieto {Beta} Reservoir

    Energy Technology Data Exchange (ETDEWEB)

    Verma, Mahendra; Quijano, Luis; Gutierrez, Hector; Iglesias, Eduardo; Truesdell, Alfred

    1996-01-24

    Monitoring changes with time of the isotopes of water (18O and D) in wellhead fluids is an effective way of indicating reservoir changes and processes. Because 18O concentrations in water are altered by high-temperature exchange with rock oxygen and because both 18O and D are fractionated in vapor-liquid separation processes at the surface (separators and cooling towers), these isotopes are excellent indicators of inflow and distribution of fluids from outside the reservoir, either natural or injected. Studies of the isotopic compositions of fluids from the Cerro Prieto field in Baja California, Mexico show that pressure drawdown in the major β (beta) reservoir has caused intense boiling followed by inflow of water from outside the reservoir. A method of field exploitation based on this behavior is discussed.

  6. Dynamics of a geothermal field traced by noble gases: Cerro Prieto, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Mazor, E. (Weizmann Inst. of Science, Rehovot, Israel); Truesdell, A.H.

    1981-01-01

    Noble gases have been measured mass spectrometrically in samples collected during 1977 from producing wells at Cerro Prieto. Positive correlations between concentrations of radiogenic (He, /sup 40/Ar) and atmospheric noble gases (Ne, Ar, and Kr) suggest the following dynamic model: the geothermal fluids originated from meteoric water penetrated to more than 2500 m depth (below the level of first boiling) and mixed with radiogenic helium and argon-40 formed in the aquifer rocks. Subsequently, small amounts of steam were lost by a Raleigh process (0 to 3%) and mixing with shallow cold water occurred (0 to 30%). Noble gases are sensitive tracers of boiling in the initial stages of 0 to 3% steam separation and complement other tracers, such as Cl or temperature, which are effective only beyond this range.

  7. BESO échelle spectroscopy of solar-type stars at Cerro Armazones

    Science.gov (United States)

    Fuhrmann, K.; Chini, R.; Hoffmeister, V. H.; Lemke, R.; Murphy, M.; Seifert, W.; Stahl, O.

    2011-03-01

    The Bochum Échelle Spectroscopic Observer BESO is a fibre-fed high-resolution spectrograph for the 1.5-m Hexapod Telescope at the Cerro Armazones Observatory in the Atacama desert in Chile. Here we report on the first BESO observations and model atmosphere analyses of solar-type stars secured in 2010 April. The quality of the data is first tested with a reflected sunlight spectrum as well as the standard G-type subgiant 70 Vir. We then investigate the bright and supposedly single F-type star ξ Gem and present the spectroscopic evidence that instead favours an equal-mass binary. We present also the first composite synthetic modelling of the G-type visual binary HR 3430 and discuss the spectroscopic observations that identify this as a triple system. We conclude with another triple, the famous and very nearby α Cen, and the basic stellar parameters of its inner, solar-type visual binary.

  8. Bottom Topography, Recent Sedimentation and Water Volume of the Cerro Prieto Dam, NE Mexico

    Science.gov (United States)

    Yutsis, V. V.

    2012-12-01

    Cerro Prieto dam, relatively small water reservoir in the NE of Mexico, is characterized by a very high velocity of recent sedimentation, irregular bottom topography and sub-bottom seepage. Very high resolution seismic study using non-linear parametric echo sounder SES-2000 was carried out in this water reservoir, which is one of the main resources of potable water for the Monterrey, the city with a population of about four million inhabitants. A strong difference between water depth and hence the volume capacity calculated by National Commission of Water (Comision Nacional del Agua, CNA), Digital Elevation Model (DEM), and acoustic data was discovered. Very high rate of recent sedimentation due to damming is discussed. SES data interpretation shows that the thickness of recent sediments due to siltation of the reservoir reaches 3.5-4.0 m. Differences between the CNA and SES data indicate storage losses from 8-10 up to 30 million cubic meters due to sedimentation.

  9. Did stresses from the Cerro Prieto Geothermal Field influence the El Mayor-Cucapah rupture sequence?

    Science.gov (United States)

    Trugman, Daniel T.; Borsa, Adrian A.; Sandwell, David T.

    2014-12-01

    The Mw 7.2 El Mayor-Cucapah (EMC) earthquake ruptured a complex fault system in northern Baja California that was previously considered inactive. The Cerro Prieto Geothermal Field (CPGF), site of the world's second largest geothermal power plant, is located approximately 15 km to the northeast of the EMC hypocenter. We investigate whether anthropogenic fluid extraction at the CPGF caused a significant perturbation to the stress field in the EMC rupture zone. We use Advanced Land Observing Satellite interferometric synthetic aperture radar data to develop a laterally heterogeneous model of fluid extraction at the CPGF and estimate that this extraction generates positive Coulomb stressing rates of order 15 kPa/yr near the EMC hypocenter, a value which exceeds the local tectonic stressing rate. Although we cannot definitively conclude that production at the CPGF triggered the EMC earthquake, its influence on the local stress field is substantial and should not be neglected in local seismic hazard assessments.

  10. Lithology and hydrothermal alteration determination from well logs for the Cerro Prieto Wells, Mexico

    Science.gov (United States)

    Ershaghi, I.; Ghaemian, S.; Abdassah, D.

    1981-10-01

    The characteristics of geophysical well logs are compared against the sand-shale series of the sedimentary column of the Cerro Prieto Geothermal Field, Mexico. It is shown that the changes in mineralogy of the rocks because of hydrothermal alteration are not easily detectable on the existing logs. However, if the behavior of clay minerals alone is monitored, the onset of the hydrothermally altered zones may be estimated from the well logs. The effective concentration of clay-exchange cations, Q/sub v/, is computed using the data available from conventional well logs. Zones indicating the disappearance of low temperature clays are considered hydrothermally altered formations with moderate to high permeability and temperature, and suitable for completion purposes.

  11. Dynamics of a geothermal field traced by noble gases: Cerro Prieto, Mexico

    Science.gov (United States)

    Mazor, E.; Truesdell, A.H.

    1984-01-01

    Noble gases have been measured mass spectrometrically in samples collected during 1977 from producing wells at Cerro Prieto. Positive correlations between concentrations of radiogenic (He and 40Ar) and atmospheric noble gases (Ne, Ar and Kr) suggest the following dynamic model: the geothermal fluids originated from meteoric water that penetrated to more than 2500 m depth (below the level of first boiling) and mixed with radiogenic He and 40Ar formed in the aquifer rocks. Subsequently, small amounts of steam were lost by a Raleigh process (0 - 30%) and mixing with shallow cold water occurred (0 - 30%). Noble gases are sensitive tracers of boiling in the initial stages of 0 - 3% steam separation and complement other tracers, such as C1 or temperature, which are effective only beyond this range. ?? 1984.

  12. Study of the atmospheric conditions at Cerro Armazones using astronomical data

    CERN Document Server

    Lakicevic, Masha; Noll, Stefan; Kausch, Wolfgang; Unterguggenberger, Stefanie; Kerber, Florian

    2016-01-01

    Aims: We studied the precipitable water vapour (PWV) content near Cerro Armazones and discuss the potential use of our technique of modelling the telluric absorbtion lines for the investigation of other molecular layers. The site is designated for the European Extremely Large Telescope (E-ELT) and the nearby planned site for the Cherenkov Telescope Array (CTA). Methods: Spectroscopic data from the Bochum Echelle Spectroscopic Observer (BESO) instrument were investigated by using line-by-line radiative transfer model (LBLRTM) radiative transfer models for the Earths atmosphere with the telluric absorption correction tool molecfit. All observations from the archive in the period from December 2008 to the end of 2014 were investigated. The dataset completely covers the El Nino event registered in the period 2009-2010. Models of the 3D Global Data Assimilation System (GDAS) were used for further comparison. Moreover, for those days with coincidence of data from a similar study with VLT/X-shooter and microwave rad...

  13. Mathematical Modeling of the Dynamics of Salmonella Cerro Infection in a US Dairy Herd

    Science.gov (United States)

    Chapagain, Prem; van Kessel, Jo Ann; Karns, Jeffrey; Wolfgang, David; Schukken, Ynte; Grohn, Yrjo

    2006-03-01

    Salmonellosis has been one of the major causes of human foodborne illness in the US. The high prevalence of infections makes transmission dynamics of Salmonella in a farm environment of interest both from animal and human health perspectives. Mathematical modeling approaches are increasingly being applied to understand the dynamics of various infectious diseases in dairy herds. Here, we describe the transmission dynamics of Salmonella infection in a dairy herd with a set of non-linear differential equations. Although the infection dynamics of different serotypes of Salmonella in cattle are likely to be different, we find that a relatively simple SIR-type model can describe the observed dynamics of the Salmonella enterica serotype Cerro infection in the herd.

  14. Results of the latest transient well pressure tests at Cerro Prieto

    Energy Technology Data Exchange (ETDEWEB)

    Abril G, A.; Vargas G, C.

    1981-01-01

    The equipment used in the interference and two-rate flow tests carried out at the Cerro Prieto geothermal field during 1980 are described. The results of two interference tests are presented, one between wells M-110 and M-104, and the other between wells M-7 and Q-757. The data was interpreted using type curve matching analysis. Results of two-rate flow tests carried out in wells M-102 and M-7 are also discussed. A technique for making two-rate flow tests is proposed. This approach, which attempts to avoid the uncertainty of present flow-rate measurements, makes use of devices for direct measurements of separated water and steam. Conclusions based on the above interpretations and recommendations for future tests are presented.

  15. MOVIMIENTOS DE LADERA Y PLANEAMIENTO URBANÍSTICO: EL CONFLICTO DEL CERRO DEL OPE, ARCHENA (MURCIA

    Directory of Open Access Journals (Sweden)

    María Dolores Gómez Moreno

    2009-01-01

    Full Text Available Los desprendimientos son un proceso natural que afecta, de forma generalizada en el Valle de Ricote, a las laderas del tipo cantil-talud. Su peligrosidad radica en que los bloques desprendidos del escarpe ruedan con facilidad, talud abajo, cuando son descalzados por efecto de la escorrentía superfi cial o desestabilizados por movimientos sísmicos. El planeamiento urbanístico se convierte en factor inductor del riesgo al clasifi car como urbanizables y urbanos suelos que, por su ubicación en pie de ladera, deberían excluirse de cualquier proceso urbanizador. Este es el caso de Archena en el entorno inmediato del cerro del Ope.

  16. Structure and age of the Cerro de Pasco Cu-Zn-Pb-Ag deposit, Peru

    Science.gov (United States)

    Cheney, E. S.

    1991-04-01

    The world-famous Cu-Zn-Pb-Ag deposit at Cerro de Pasco, Peru, consists of texturally massive pyrite, texturally massive sphalerite-galena-pyrite, and veins containing pyrite and enargite. Historically the deposit has been considered to be the hydrothermal product of the adjacent Miocene volcanic and intrusive complex (locally known as the “Vent”). However, both the texturally massive sulfides of the deposit and the pre-Miocene strata are cut by the Longitudinal fault, one of the largest faults in the district, but the Vent is not. Imbrication by the Longitudinal fault zone (duplex structures) has thickened the deposit so that it is amenable to open-pit mining. Dikes and pyrite-enargite veins pass from the Vent into the massive sulfides; fragments of massive pyrite occur in the Vent. Thus, no matter what their origin, the texturally massive sulfides are older and, therefore, genetically unrelated to the Vent.

  17. Burning down the brewery: establishing and evacuating an ancient imperial colony at Cerro Baul, Peru.

    Science.gov (United States)

    Moseley, Michael E; Nash, Donna J; Williams, Patrick Ryan; DeFrance, Susan D; Miranda, Ana; Ruales, Mario

    2005-11-29

    Before the Inca reigned, two empires held sway over the central Andes from anno Domini 600 to 1000: the Wari empire to the north ruled much of Peru, and Tiwanaku to the south reigned in Bolivia. Face-to-face contact came when both colonized the Moquegua Valley sierra in southern Peru. The state-sponsored Wari incursion, described here, entailed large-scale agrarian reclamation to sustain the occupation of two hills and the adjacent high mesa of Cerro Baúl. Monumental buildings were erected atop the mesa to serve an embassy-like delegation of nobles and attendant personnel that endured for centuries. Final evacuation of the Baúl enclave was accompanied by elaborate ceremonies with brewing, drinking, feasting, vessel smashing, and building burning.

  18. Volcanic hazard map for Telica, Cerro Negro and El Hoyo volcanoes, Nicaragua

    Science.gov (United States)

    Asahina, T.; Navarro, M.; Strauch, W.

    2007-05-01

    A volcano hazard study was conducted for Telica, Cerro Negro and El Hoyo volcanoes, Nicaragua, based on geological and volcanological field investigations, air photo analyses, and numerical eruption simulation. These volcanoes are among the most active volcanoes of the country. This study was realized 2004-2006 through technical cooperation of Japan International Cooperation Agency (JICA) with INETER, upon the request of the Government of Nicaragua. The resulting volcanic hazard map on 1:50,000 scale displays the hazards of lava flow, pyroclastic flows, lahars, tephra fall, volcanic bombs for an area of 1,300 square kilometers. The map and corresponding GIS coverage was handed out to Central, Departmental and Municipal authorities for their use and is included in a National GIS on Georisks developed and maintained by INETER.

  19. Mid amphibolite facies metamorphism of harzburgites in the Neoproterozoic Cerro Mantiqueiras Ophiolite, southernmost Brazil

    Directory of Open Access Journals (Sweden)

    HARTMANN LÉO A.

    2003-01-01

    Full Text Available Valuable information is retrieved from the integrated investigation of the field relationships, microstructure and mineral compositions of harzburgites from the Neoproterozoic Cerro Mantiqueiras Ophiolite. This important tectonic marker of the geological evolution of southernmost Brazilian Shield was thoroughly serpentinized during progressive metamorphism, because the oldest mineral assemblage is: olivine + orthopyroxene + tremolite + chlorite + chromite. This M1 was stabilized in mid amphibolite facies - 550-600ºC as calculated from mineral equilibria. No microstructural (e.g. ductile deformation of olivine or chromite or compositional (e.g. mantle spinel remnant of mantle history was identified. A metamorphic event M2 occurred in the low amphibolite facies along 100 m-wide shear zones, followed by intense serpentinization (M3 and narrow 1-3 m-wide shear zones (M4 containing asbestos.

  20. Burn Severities, Fire Intensities, and Impacts to Major Vegetation Types from the Cerro Grande Fire

    Energy Technology Data Exchange (ETDEWEB)

    Balice, Randy G. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Bennett, Kathryn D. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Wright, Marjorie A. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2004-12-15

    The Cerro Grande Fire resulted in major impacts and changes to the ecosystems that were burned. To partially document these effects, we estimated the acreage of major vegetation types that were burned at selected burn severity levels and fire intensity levels. To accomplish this, we adopted independently developed burn severity and fire intensity maps, in combination with a land cover map developed for habitat management purposes, as a basis for the analysis. To provide a measure of confidence in the acreage estimates, the accuracies of these maps were also assessed. In addition, two other maps of comparable quality were assessed for accuracy: one that was developed for mapping fuel risk and a second map that resulted from a preliminary application of an evolutionary computation software system, called GENIE.

  1. La necrópolis medieval del Cerro de la Horca de Toledo

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    Ruiz Taboada, Arturo

    2009-06-01

    Full Text Available The archaeological excavation of part of a medieval necropolis at the Cerro de la Horca (Toledo has provided new information regarding burial traditions in Toledo. One formal aspect is common to the broad range of graves that have been brought to light, namely the pit that was dug for the burial, being of considerable depth in a number of cases. Because little is known of the funerary practices in Toledo during the Middle Ages and hardly any objects have been recovered in the excavation, it is difficult to identify the religious community to which it belonged. Whereas the location of Muslim and Christian cemeteries have been known through documentary and archaeological sources, only popular traditions quoted so far the Jewish necropolis, its location remaining thus a mystery.

    La excavación arqueológica desarrollada en un sector del Cerro de La Horca ha permitido conocer aspectos inéditos del ritual de enterramiento medieval en Toledo. Se ha documentado una amplia tipología de tumbas con un único elemento constructivo común para todas ellas, la excavación previa de una fosa que, en numerosos casos, alcanza gran profundidad. El desconocimiento sobre el mundo funerario medieval toledano y la falta de materiales arqueológicos representativos en esta necrópolis han obligado a reflexionar sobre la comunidad religiosa a la que pertenecen estos enterramientos. Por fuentes históricas y excavaciones previas, conocemos la localización de necrópolis musulmanas y cristianas. La localización de la(s judía(s había sido, al menos hasta ahora, una incógnita.

  2. Monitoreo de DDI en la provincia de Corrientes (2005

    Directory of Open Access Journals (Sweden)

    Silvia B Lapertosa

    2009-09-01

    Full Text Available Un total de 610 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos localidades de la provincia de Corrientes: Ciudad de Corrientes (292 niños y Paso de la Patria (318 niños. La edad de los escolares osciló entre 6 y 15 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-23, se tomó como única referencia la palpación de H.N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (145 de Corrientes y 131 de Paso de la Patria. Se recolectaron 271 muestras de sal de consumo hogareño de Corrientes y 318 de Paso de la Patria, para medir su contenido en yodo. El examen palpatorio de los niños reveló la existencia de bocio grado 1 solamente. La prevalencia de bocio encontrada fue de 5,5% en Corrientes y de 4,1% en Paso de la Patria. Los niveles de yoduria alcanzaron, en Corrientes, una media de 190,4 ± 176,6 (DS μg/L y una mediana de 159μg/L, al tiempo que en Paso de la Patria la media fue de 326 ± 348μg/L y la mediana de 282μg/L. El contenido de yodo de las sales, que aportaron los alumnos desde sus hogares, fue adecuado para la mayoría de las marcas de mayor consumo. Sin embargo, otras demostraron un déficit importante en sus niveles de yodación. Afortunadamente, estas últimas fueron la minoría y no repercutieron significativamente sobre la concentración global de yodo en la sal de consumo. De esta manera, observamos que en la ciudad de Corrientes el promedio de yodo en la sal, tomada en conjunto, fue de 28,2 ± 13,1 mg/Kg, mientras que para Paso de la Patria fue de 31,0 ± 14,3 mg/Kg. Al analizar las concentraciones de yodo <15mg/ Kg, observamos que fue del

  3. Saqueos en la provincia de Corrientes durante la Guerra del Paraguay

    OpenAIRE

    Ramírez Braschi, Dardo

    2014-01-01

    La guerra del Paraguay tuvo como único escenario en territorio argentino a la provincia de Corrientes. El enfrentamiento de ambos ejércitos generaron múltiples consecuencia entre los correntinos, pero el impacto inmediato fueron los saqueos y destrozos producidos tanto por el ejército paraguayo como por las tropas aliadas. La invasión paraguaya a territorio correntino dejara secuelas importantes en sus habitantes y en el futuro político de la provincia. The province of Corrientes was the o...

  4. Civilidad, policiamiento y marginalidad : La seguridad ciudadana en la provincia de Buenos Aires

    OpenAIRE

    2007-01-01

    La temática planteada en el presente trabajo versa sobre la construcción conceptual de la noción de seguridad/inseguridad que aparece en las prácticas y discursos oficiales de las gestiones de gobierno en la provincia de Buenos Aires en los últimos años. Consiste en reconocer los programas en materia de seguridad de las gestiones de gobierno de Carlos Ruckauf desde 1999 hasta 2001, al frente de la provincia de Buenos Aires, y Felipe Solá desde 2003 hasta la actualidad. Tratamos de reconoce...

  5. Código de aguas de la provincia de Río Negro

    OpenAIRE

    Volonté, Miguel

    2014-01-01

    El objetivo del presente trabajo es destacar en forma sintética los aspectos jurídicos más importantes que surgen del Código de Aguas de la Provincia de Río Negro, sus antecedentes y bases constitucionales, tomando como guía una serie de preguntas planteadas con el objeto de realizar un análisis comparativo con los códigos de las restantes provincias. Se recorren los antecedentes normativos del Código actual y el tratamiento que éste hace de los tipos de aguas comprendidas, los usos regula...

  6. La dualidad de la cultura castreña en la provincia de Soria

    Directory of Open Access Journals (Sweden)

    María Luisa REVILLA ANDIA

    2009-10-01

    Full Text Available La investigación de la Primera Edad del Hierro ha estado marcada en la zona oriental de la Meseta Superior, como es sabido, por dos áreas diferenciadas: los castros de la serranía norte de la provincia de Soria, recientemente revisados y actualizados por el Prof. Romero en un magnífico estudio 1, y las necrópolis que Bosch denominó «posthallstátticas» en la zona centro y sur de esta provincia y norte de Guadalajara.

  7. Edad, caracterización petrográfica y Geoquímica del Granitoide del Cerro Falkner, Neuquén Age, petrography and geochemistry of Cerro Falkner's granitoid

    Directory of Open Access Journals (Sweden)

    Sabrina Crosta

    2008-03-01

    Full Text Available El Cerro Falkner se halla constituido por rocas graníticas infrayacentes a las volcanitas de la Formación Ventana de edad paleógena. Dichos intrusivos son de composición granodiorítica, metaluminosos a peraluminosos, subalcalinos, con características de granitos de arco volcánico concordantes con otros granitoides del segmento norte de la Cordillera Patagónica Septentrional. La edad obtenida por el método K-Ar sobre anfíboles de composición tschermakítica (125 ± 20 Ma indica una edad mínima perteneciente al Cretácico inferior para la granodiorita del cerro Falkner, por lo que sería incorrecto utilizar la denominación Formación Los Machis (Cretácico superior para estas rocas. Esta edad, permite vincular las rocas graníticas del área de estudio con el volcanismo representado por el Grupo Divisadero de edad predominantemente cretácica inferior.Cerro Falkner is composed of granitic rocks underlying volcanic rocks of the Ventana Formation of Paleogene age. Those intrusives are granodioritic in composition, metaluminous to peraluminous, subalkaline, with characteristics of volcanic arc granites that are concordant with other granitoids of the Cordillera Patagónica Septentrional's northern segment. The age obtained by the K-Ar method on tschemakitic amphiboles (125 ± 20 Ma points out a minimun age from the lower Cretaceous for the Cerro Falkner's granodiorite. Therefore the use of the term Los Machis Formation (Upper Cretaceous would be incorrect for these rocks. This age, allows us to relate the granitic rocks on the study area to the lower Cretaceous, coeval with the volcanism of the Divisadero Group.

  8. Corrosion in pipelines and well casings at the Cerro Prieto geothermal field, BC; Corrosion en tuberias de linea y de revestimiento de pozos del campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Miranda Herrera, Carlos A.; Canchola Felix, Ismael; Raygoza Flores, Joaquin; Mora Perez, Othon [Comision Federal de Electricidad, Residencia General de Cerro Prieto, Mexicali, Baja California (Mexico)]. E-mail: carlos.miranda02@cfe.gob.mx

    2009-07-15

    In the area called Poligono Hidalgo, inside the Cerro Prieto IV zone in the Cerro Prieto geothermal field, BC, corrosion has occurred in the last few years on well casings and pipelines used for geothermal fluids. Corrosion test results are presented here for pipes, type API L-80 and ASTM A-53 grade B, which were subjected to condensate from wells 403 and 424. These wells have thrown corroded material from their respective casings. With these data we pinpoint corrosive conditions in this field area and determine which pipes are adequate to case wells in similar chemical, production conditions to minimize adverse effects and extend the life of the well, allowing more efficient exploitation of the deepest production zones in the reservoir. [Spanish] En el campo geotermico de Cerro Prieto, BC, dentro del area del Poligono Hidalgo en el sector conocido como Cerro Prieto IV, algunos pozos han presentado en los ultimos anos desgastes en sus tuberias de revestimiento y en las tuberias de linea para el transporte del fluido geotermico. Se presentan resultados de pruebas de corrosion con tuberias tipo API L-80 y ASTM A-53 grado B al ser sometidas al condensado de los pozos 403 y 424, los cuales han estado arrojando material de sus respectivas tuberias de revestimiento. Con estos datos se pretende conocer las condiciones corrosivas de esa zona del campo y determinar cual seria la tuberia ideal a utilizar en pozos con condiciones quimicas de produccion semejantes a fin de minimizar este efecto adverso y prolongar la vida de los pozos, a la vez que se permita la explotacion eficiente de las zonas productoras mas profundas del yacimiento.

  9. Tratamento para escoliose através do método iso-stretching e uso de bola suíça

    Directory of Open Access Journals (Sweden)

    Kelly Cattelan Bonorino

    2008-10-01

    Full Text Available A escoliose envolve uma modificação das vértebras e costelas com rotação vertebral, desvio lateral e lordose, o que gera transtornos, principalmente em crianças e adolescentes por seu caráter evolutivo. Muitos métodos têm sido propostos para o tratamento desse tipo de deformidade postural, com objetivo de controlar a evolução e prevenir complicações. Nesse trabalho aplicou-se a técnica de Iso-Streching e o uso de Bola Suíça para tratamento de um paciente portador de escoliose idiopática. As principais metas foram proporcionar o alongamento das cadeias musculares, aumentar a flexibilidade e melhorar o padrão postural. O paciente foi submetido a avaliação das cadeias musculares, avaliação postural, teste de Adams, mensuração da flexibilidade e do ângulo de Cobb. Após o tratamento, verificou-se melhora do padrão postural, diminuição da dor e diminuição das retrações musculares.

  10. Rescribir el horror. Historia y poética de la memoria en la obra de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Alba Solà Garcia

    2013-04-01

    Full Text Available Con los horrores del siglo XX, el mal ha caído en un vacío ontológico que lo hace ininteligible: la desemantización de su lenguaje y la atrofia de sus fórmulas niegan la posibilidad de erigir un discurso válido, sea éste en el plano moral, político o filosófico. La literatura, sin embargo, se aventura a resignificar el espacio del mal a partir de su reelaboración en la dimensión simbólica de la ficción. Roberto Bolaño reconstruye el discurso histórico chileno en Estrella distante y Nocturno de Chile, denunciando el fenómeno del mal y su reiterada aparición en la Historia y resignificando su lenguaje a partir de una poética del ocultamiento y la sugerencia que permite visibilizar el horror y sus espacios, convirtiendo sus ficciones en documentos testimoniales que reelaboran la memoria histórica latinoamericana y reivindican sus episodios olvidados.

  11. Study of the structural control of fluid flow within the Cerro Prieto Geothermal Field, Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Noble, J.E.; Manon, M.A.; Lippmann, M.J.; Witherspoon, P.A.

    1977-10-01

    The Lawrence Berkeley Laboratory and the Comision Federal de Electricidad of Mexico are conducting a joint investigation of the Cerro Prieto Geothermal Field, located approximately 35 km south of Mexicali, Baja California, Mexico, in the Sea of Cortez-Salton Trough. Recent analyses of various geophysical/electrical logs, temperature logs, production and geochemical data and the subsequently developed preliminary model of the structure of the geothermal system and the distribution of geothermal fluids are presented. Techniques routinely applied to petroleum exploration were successfully used in the development of a preliminary model of this water-dominated system. The study indicates the upwelling of geothermal fluids along an east bounding fault from a deep, as yet unexplored source. The fluids dissipate into various sand horizons at various depths. The resulting stratigraphic and fluid flow model is of importance in planning additional developments of the Cerro Prieto Geothermal Field.

  12. Relationshipe Between Self-potential Anomalies and Hydraulic Flow In A Geothermal System: Application To Cerro-prieto, Baja California

    Science.gov (United States)

    Saracco, G.; Revil, A.; Pessel, M.

    The Cerro Prieto geothermal field is located in the alluvial plain of the Mexicali Valley, northern Baja California, Mexico, at about 35 km southeast of the city of Mexicali. The Cerro Prieto geothermal field is one of several high temperature water-dominated geothermal fields within the Salton Trough. We analyze here the self-potential distri- bution at the ground surface in order to determine the pattern of fluid flow in te sub- surface of this geothermal field. Various methods of analysis of self-potential anoma- lies are employed to reach this purpose. We use density probability tomography of monopolar and dipolar electrical sources and an Euler-type analysis. The hydraulic flow pattern found in this geothermal field is in agreement with that detemined from the heat flux inside the structure.

  13. CATÁLOGO COMENTADO DE LAS HEPÁTICAS DEL CERRO DE MAMAPACHA, MUNICIPIO DE CHINAVITA-BOYACÁ, COLOMBIA

    Directory of Open Access Journals (Sweden)

    WILSON RICARDO ÁLVARO ALBA

    2007-01-01

    Full Text Available Se presenta el catálogo comentado de 77 especies de hepáticas presentes en el cerro de Mamapacha en donde se organizan alfabéticamente las familias, géneros y es- pecies. Se proporciona información sobre la forma de crecimiento, abundancia, hábitat y distribución. Se resalta la presencia de 23 especies como nuevos registros para Boyacá.

  14. Oxygen isotope exchange in rocks and minerals from the Cerro Prieto geothermal system: Indicators of temperature distribution and fluid flow

    Energy Technology Data Exchange (ETDEWEB)

    Williams, A.E.; Elders, W.A.

    1981-01-01

    Oxygen isotopic compositions have been measured in drill cuttings and core samples from more than 40 wells ranging in depth to more than 3.5 km in the Cerro Prieto geothermal field. Profiles of isotopic ratios versus sampling depths provide information on the three-dimensional distribution of temperature and fluid flow. These parameters also indicate variations in the history of hydrothermal processes in different areas of the geothermal field.

  15. Cerro prieto y su correlación con los centros de dispersión del Golfo de California

    OpenAIRE

    Francisco Suárez Vidal; Ana Luz Quintanilla Montoya

    1996-01-01

    The Cerro Prieto geothermal tield is located in the Mexicali Valley, Baia California. Tectonically, this northern part of the Gulf of California has been classitied as a spreadmg center, within a transitional area of oceanic to continental conditions. Thermal, geologic-tectonic and magnetic evidente has been used to postulate the existence of a heat source in the area that is associated with magmatic processes, similar to those that occur in a typical oceanic spreading center. Based on the pe...

  16. Xenoliths of Cerro las Mercedes, Costa Rica: a Geochemical Record of Arc History?

    Science.gov (United States)

    Lindsay, F. N.; Gazel, E.; Herzberg, C. T.; Carr, M. J.; Feigenson, M. D.

    2006-12-01

    Over 70 ultramafic xenoliths, many with diameters of at least 3cm, open a window into the mantle beneath Cerro las Mercedes, Costa Rica. This quaternary vent is 70km behind the active volcanic front and near the northern boundary of the Caribbean Plateau. Both xenoliths and host lava remain well preserved in spite of substantial soil development in a rain forest environment. We analyzed the host lava and a subset of 30 rocks for bulk and mineral chemistry, which include both peridotite and pyroxenite populations. The host rock is Plio-Quaternary potassic alkaline basalt; depleted in SiO2 and Al2O3 and enriched in MgO and P2O5 relative to both present day and Miocene volcanics. In terms of trace elements, the host basalt has enriched LREEs and relative depletion of HFSEs, typical of island-arc basalt, both present and past. The coarse-grained pyroxenites have trace element chemistry akin to the volcanic front lavas of Costa Rica, although they are closer to chondritic values. Truly, they are more similar to basalts from Sarapiquí Miocene arc than to present day volcanic front basalts. Although there is enrichment in incompatible elements such as Ba and U and depletions in HFSEs, common in island arc basalts, the pyroxenites have a strong positive Pb anomaly that is characteristic only of the Miocene arc, not present day lavas. We interpret the pyroxenites as cumulates. The peridotite population includes dunites, spinel lherzolites and lherzolites. These rocks have Mg-numbers ranging from 87 to 92 and Cr-numbers ranging from 6 to 61. Whole rock geochemistry indicates that the peridotite xenoliths are fragments of mantle associated with the western Caribbean Plateau. SiO2, FeO, Al2O3 and MgO contents of several Cerro Mercedes peridotites are similar to those expected of hot residues that would form in a plume environment. Trace elements reveal some samples with enrichment of Ba and U, and depletion in Nb and Ta indicating variable extents of melt-rock reaction and

  17. ANALYSIS OF RECHARGE COOLDOWN AT THE WESTERN BOUNDARY OF CERRO PRIETO I GEOTHERMAL FIELD

    Energy Technology Data Exchange (ETDEWEB)

    Kruger, P.; Lam, S.; Hunsbedt, A.; Esquer, C.; Marquez, R.; Hernandez, L. Cobo, J.

    1985-01-22

    Extensive study of the Cerro Prieto geothermal field has provided much geologic and thermodynamic data of its structurally-complex, liquid-dominated reservoir. Several of the studies investigated the resource characteristics of fluid and energy flow. An early report by Mercado (1975) showed that the heat source for the part of the reservoir under development, now called Cerro Prieto I (CPI), originated in the eastern part of the field. Subsequent studies confirmed the flow of hot water from the east. A summary of several experimental and numerical studies of fluid and energy transport in the field was given by Lippmann and Bodvarsson (1983). The hydrogeologic model of Halfman et al. (1982) shows hot-water flow from the east divided into a shallow (alpha) aquifer at about 120Om and a deeper (beta) aquifer at about 170Om depth. A cross section along an east-west direction shows a central upflow to the two aquifers and uncertain geology beyond the western border of the field near well M-9. It also shows a fault dividing the line of border wells at M-29 from the inner wells at M-25 to the east. The hydrogeology of the field was described by Sanchez and de la Pena (1981) as an alluvial unit from the surface to about 700 m over the production zone and a shale-sandstone unit comprising an upper, shallow (alpha) aquifer bounded below by a basement horst overlying a deeper (beta) aquifer. To date, much of the cumulative production at Cerro Prieto I has been from the alpha aquifer. Piezometric level measurements over the first 5 years of operation showed a decline in the western zone beyond the production wells. Over the 10-year period of continuous production, a significant temperature decline has been observed along the westernmost line of wells. Several investigations of the recharge characteristics of the field have been reported. Mercado (1975) and Elders et al. (1984) indicated a flow of cold groundwater from the east. Mercado also noted that cold water was entering

  18. Intense Seismic Activity at Chiles and Cerro Negro Volcanoes on the Colombia-Ecuador Border

    Science.gov (United States)

    Torres, R. A.; Cadena, O.; Gomez, D.; Ruiz, M. C.; Prejean, S. G.; Lyons, J. J.; White, R. A.

    2015-12-01

    The region of Chiles and Cerro Negro volcanoes, located on the Colombian-Ecuadorian border, has experienced an ongoing seismic swarm beginning in Aug. 2013. Based on concern for local residents and authorities, a cooperative broadband monitoring network was installed by the Servicio Geológico Colombiano in Colombia and the Instituto Geofísico of the Escuela Politécnica Nacional in Ecuador. Since November 2013 more than 538,000 earthquakes were recorded; although since May 2015 the seismicity has decreased significantly to an average of 70 events per day. Three large earthquake swarms with increasing energy occurred in Aug.-Oct. 2013, March-May 2014, and Sept.-Dec. 2014. By the end of 2014, roughly 400 earthquakes greater than M 3 had occurred with a maximum rate of 8000 earthquakes per day. The largest earthquake was a 5.6 ML on Oct. 20, 2014. This event produced an InSAR coseismic deformation of ~23 cm (S. Ebmeier, personal communication). Most events are typical brittle failure volcano-tectonic (VT) earthquakes that are located in a cluster beneath the southern flank of Chiles volcano, with depths between 1.5 and 10 km. Although the great majority of earthquakes are VT, some low-frequency (LF, ~0.5 Hz) and very-low-frequency (VLF) events have occurred. Particle motion analysis suggests that the VLF source migrated with time. While a VLF on Oct. 15, 2014 was located south of Chiles volcano, near the InSAR source, the VLF registered on Feb. 14, 2015 was likely located very close to Chiles Volcano. We infer that magma intrusion and resulting fluid exsolution at depths greater than 5 km are driving seismicity in the Chiles-Cerro Negro region. However earthquakes are failing in a manner consistent with regional tectonics. Relative relocations reveal a structure consistent with mapped regional faults. Thus seismicity is likely controlled by an interaction of magmatic and tectonic processes. Because the regional stress field is highly compressional and the volcanoes

  19. INVESTIGACIONES ARQUEOLÓGICAS EN EL FORTÍN PESCADO, PARTIDO DE BENITO JUÁREZ, PROVINCIA DE BUENOS AIRES / Archaelogical research at Fortin Pescado, Benito Juárez county, Buenos Aires province

    Directory of Open Access Journals (Sweden)

    Vanesa Natalia Bagaloni

    2015-12-01

    Full Text Available En este trabajo se presentan los primeros resultados del estudio de los materiales recuperados en la localidad arqueológica Fortín Pescado, ubicada sobre la margen izquierda del arroyo Pescado Castigado, en el partido de Benito Juárez (provincia de Buenos Aires. Esta localidad se compone de dos sitios arqueológicos (Fortín Pescado 1 y Fortín Pescado 2 donde se efectuaron excavaciones y recolecciones en superficie y en el perfil de barrancas aledañas. El conjunto arqueológico de ambos sitios incluye restos faunísticos (mayormente animales domésticos, materiales vítreos (botellas cuadradas y cilíndricas, frascos, tarros y damajuanas, fragmentos de gres (botellas de ginebra y/o agua mineral, lozas (tazas y bowls ingleses, metales (clavos, botón, cuchilla y arma, ladrillos y un fragmento de bola de boleadora. Según diversos documentos escritos procedentes del Servicio Histórico del Ejército, del Archivo General de la Nación y del departamento de Geodesia, este fortín se instaló en 1858 y funcionó por lo menos hasta fines de 1863, cuando pasó a ser usado como posta militar hasta el fin de la década. A partir de las intervenciones arqueológicas y el relevamiento de las fuentes escritas se pudieron determinar áreas de actividades específicas (vivienda, descarte pautado y no pautado, corral dentro de esta localidad.  AbstractIn this paper the first results of the materials recovered at the Fortin Pescado archaeological locality are presented. This locality is situated on the left bank of Pescado Castigado stream (Benito Juárez County, Buenos Aires Province. It is composed by two sites (Fortin Pescado 1 and Fortin Pescado 2 where excavations and surface surveys were developed. Surface surveys were also conducted on the profiles of the surrounding canyons. The archaeological assemblages of both sites include faunal remains (mostly of domestic fauna/animals, glassy materials (square and cylindrical bottles, flasks, jars and jugs

  20. Nematodos entomofílicos de la provincia de Córdoba, Argentina

    OpenAIRE

    2008-01-01

    Se reseña la situación actual de nematodos entomofílicos en la provincia de Córdoba. Son consideradas las familias: Heterorhabditidae, Mermithidae, Steinernematidae y Thelastomatidae acerca de aspectos relacionados con su biología, ecología y distribución. Academia Nacional de Agronomía y Veterinaria

  1. Primer registro de Aplectana hylambatis (Nematoda, Cosmocercidae para anfibios de la provincia de San Juan

    Directory of Open Access Journals (Sweden)

    Quiroga, Lorena B.

    2012-11-01

    Full Text Available La presente nota representa los primeros registros de parásitos (nematodos para anfibios de la provincia de San Juan. Además, se discute la variación morfológica de los nematodos encontrados con otras poblaciones de Argentina.

  2. Fanerógamas de la provincia de Huancayo, Perú

    Directory of Open Access Journals (Sweden)

    Genaro Yarupaitán Galván

    2013-06-01

    Full Text Available Se presenta una relación detallada, incluyendo forma de vida, rangos altitudinales y nombres comunes de 328 especies de fanerógamas comprendidas en 61 familias registrados hasta hoy en la provincia de Huancayo, departamento de Junín, Perú Central.

  3. provincia de Buenos Aires (República Argentina

    Directory of Open Access Journals (Sweden)

    Rubén Alberto Cervini

    2008-01-01

    Full Text Available En el estudio que se informa se investigaron las relaciones entre progreso de aprendizaje (valor agregado, motivación y autoconcepto académico del alumno en Matemática, en el marco de los efectos de las características socioeconómicas y académicas del alumno y de su escuela. Para la medición del valor agregado se utilizaron los resultados de dos pruebas estandarizadas de Matemática aplicadas a una cohorte de alumnos de la Provincia de Buenos Aires (República Argentina en dos momentos diferentes (séptimo y noveno años de Educación General Bási ca - EGB. Las mediciones de motivación y de autoconcepto se basaron en respuestas a ítemes binarios de actitudes con respecto a Ma temática y fueron definidas utilizando el análisis de la componente prin - cipal, a partir de la matriz de correlación tetracórica (método heurístico. Para el análisis de las correlaciones se utilizó la téc nica estadística de modelos multinivel. El presente estudio relaciona los resultados empíricos con la teoría del habitus de Bourdieu. Inicialmente, el autoconcepto resulta significativa y positivamente asociado con el puntaje en la prueba y con el progreso de aprendizaje posterior. Este efecto continúa siendo significati vo aun cuando se controlan los efectos del nivel socioeconómi - co y del género del alumno. Sin embargo, su capacidad ex plicativa es muy tenue desde el punto de vista práctico. Si bien este resultado confirmaría la hipótesis central de la teoría de la reproducción, indica un sendero a través del cual podrían producirse transformaciones. Uno de los desafíos del sistema educativo es promover el habitus escolar cultivado (autoconcepto más allá de las determinaciones sociales, culturales y económicas.

  4. Subsurface Connections and Magma Mixing as revealed by Olivine- and Pyroxene-Hosted Melt Inclusions from Cerro Negro Volcano and the Las Pilas-El Hoyo Complex, Nicaragua.

    Science.gov (United States)

    Venugopal, S.; Moune, S.; Williams-Jones, G.

    2015-12-01

    Cerro Negro, the youngest volcano in the Central American Volcanic Belt, is a polygenetic cinder cone with relatively frequent explosive basaltic eruptions. Las Pilas, on the other hand, is a much larger and older complex with milder and less frequent eruptions. Based on historical data, these two closely spaced volcanoes have shown concurrent eruptive behavior, suggesting a subsurface connection. To further investigate this link, melt inclusions, which are blebs of melt trapped in growing crystals, were the obvious choice for optimal comparison of sources and determination of pre-eruptive volatile contents and magmatic conditions. Olivine-hosted inclusions were chosen for both volcanoes and pyroxene-hosted inclusions were also sampled from Las Pilas to represent the evolved melt. Major, volatile and trace elements reveal a distinct geochemical continuum with Cerro Negro defining the primitive end member and Las Pilas representing the evolved end member. Volatile contents are high for Cerro Negro (up to 1260 ppm CO2, 4.27 wt% H2O and 1700 ppm S) suggesting that volatile exsolution is likely the trigger for Cerro Negro's explosive eruptions. Las Pilas volatile contents are lower but consistent with degassing and evolutionary trends shown by major oxides. Trace element contents are rather unique and suggest Cerro Negro magmas fractionally crystallize while Las Pilas magmas are the products of mixing. Magmatic conditions were estimated with major and volatile contents: at least 2.4 kbar and 1170 °C for Cerro Negro melts and 1.3 kbar and 1130 °C for Las Pilas melts with an overall oxygen fugacity at the NNO buffer. In combination with available literature data, this study suggests an interconnected subsurface plumbing system and thus Cerro Negro should be considered as the newest vent within the Las Pilas-El Hoyo Complex.

  5. The Final Days of Paracas in Cerro del Gentil, Chincha Valley, Peru.

    Directory of Open Access Journals (Sweden)

    Henry Tantaleán

    Full Text Available This article describes and analyzes a highly significant archaeological context discovered in a late Paracas (400-200 BCE sunken patio in the monumental platform mound of Cerro Gentil, located in the Chincha Valley, Peru. This patio area was used for several centuries for ritual activities, including large-scale feasting and other public gatherings. At one point late in this historical sequence people deposited a great deal of objects in what is demonstrably a single historical event. This was quickly followed by a series of minor events stratigraphically immediately above this larger event. This entire ritual process included the consumption of liquids and food, and involved the offering of whole pottery, pottery fragments, botanical remains, bone, lithics, baskets, pyro-engraved gourds, mummies, and other objects. We interpret these events as an "abandonment ceremony" or "termination ritual" during the late Paracas period, one that may have lasted for weeks or even months. The subsequent Topará occupation at the site (ca. 200 BCE- AD 100 involved the architectural enhancement of the mound area, but the pattern of use of the patio itself ended. Such a termination ritual signals a reorganization in the regional political structure of Paracas society.

  6. Forecast of surface layer meteorological parameters at Cerro Paranal with a mesoscale atmospherical model

    CERN Document Server

    Lascaux, Franck; Fini, Luca

    2015-01-01

    This article aims at proving the feasibility of the forecast of all the most relevant classical atmospherical parameters for astronomical applications (wind speed and direction, temperature) above the ESO ground-base site of Cerro Paranal with a mesoscale atmospherical model called Meso-Nh. In a precedent paper we have preliminarily treated the model performances obtained in reconstructing some key atmospherical parameters in the surface layer 0-30~m studying the bias and the RMSE on a statistical sample of 20 nights. Results were very encouraging and it appeared therefore mandatory to confirm such a good result on a much richer statistical sample. In this paper, the study was extended to a total sample of 129 nights between 2007 and 2011 distributed in different parts of the solar year. This large sample made our analysis more robust and definitive in terms of the model performances and permitted us to confirm the excellent performances of the model. Besides, we present an independent analysis of the model p...

  7. Intersecting faults and sandstone stratigraphy at the Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Vonder Haar, S.; Howard, J.H.

    1980-02-01

    The northwest-southeast trending Cerro Prieto fault is part of a major regional lineament that extends into Sonaro and has characteristics of both a wrench fault and an oceanic transform fault. The distribution of lithologies and temperature within the field was studied by comparing data from well cuttings, cores, well logs, and geochemical analyses. Across the earliest developed portion of the field, in particular along a 1.25-km northeast-southwest section from well M-9 to M-10, interesting correlations emerge that indicate a relationship among lithology, microfracturing, and temperature distribution. In the upper portion of Reservoir A of this stratigraphic section, between 1200 and 1400 m, the percentage of sandstones ranges from 20 to 55. Temperatures are 225/sup 0/ to 275/sup 0/C based on well logs, calcite isotope maxima, and Na-K-Ca indices. The study shows that an isothermal high in this vicinity corresponds to the lowest total percentage of sandstones. Scanning electron microphotographs of well cores and cuttings from sandstone and shale units reveal clogging, mineral dissolution, and mineral precipitation along microfractures. The working hypothesis is that these sandy shale and siltstone facies are most amenable to increased microfracturing and, in turn, such microfracturing allows for higher temperature fluid to rise to shallower depths in the reservoir.

  8. A simulation of the Cerro Hudson SO[sub 2] cloud

    Energy Technology Data Exchange (ETDEWEB)

    Schoeberl, M.R.; Lait, L.R.; Newman, P.A.; Krueger, A.J. (NASA Goddard Space Flight Center, Greenbelt, MD (United States)); Doiron, S.D. (Hughes STX Corp., Lanham, MD (United States))

    1993-02-20

    An isentropic trajectory model is used to simulate the evolution of the southern hemisphere SO[sub 2] cloud associated with the eruption of Cerro Hudson. By matching the parcel trajectories with total ozone mapping spectrometer SO[sub 2] retrievals, the principal stratospheric injection region is determined to be between 11 and 16 km in altitude. This region is characterized by weak wind shears and is located just poleward of the subtropical jet in the outer fringe of the stratospheric polar vortex. The lack of wind shear in the injection region explains the slow zonal dispersal of the SO[sub 2] cloud which was still clearly observed 19 days after the eruption. The trajectory model simulation of the SO[sub 2] cloud shows good agreement with observations for 7 days after the eruption. Using the potential vorticity and potential temperature estimates of the initial eruption cloud, the cloud position relative to the polar night jet is shown to be nearly fixed up to September 2, 1991, which was as long as the cloud was observed. This result suggests that the lower stratopsheric polar and mid-latitude regions are nearly isolated from each other during the late August period. 9 refs., 5 figs.

  9. Repetitive precision gravity studies at the Cerro Prieto and Heber geothermal fields

    Science.gov (United States)

    Grannell, R. B.

    1982-09-01

    To study subsidence and mass removal, a precise gravity network was established on 60 permanent monuments in the Cerro Prieto geothermal field in early 1978, and repeated annually through early 1981; the survey was tied to two bedrock sites outside the limits of the current production zone. The looping technique of station occupation was utilized, in which occupation of the base was followed by occupation of several stations, followed by a return to the base. Use of two LaCoste and Romberg gravity meters, and replication of values within loops as well as entire loops, enhanced precision such that the median standard deviations of the base-to-station differences, reduced to observed gravity values, ranged from 7 to 15 microgals for individual surveys. The smaller values were obtained as field and data reduction techniques were improved and experience was gained. A similar survey was initiated in the Heber area just north of the Mexican border in early 1980. It too was established on permanent monuments, was tied to bedrock stations outside the geothermal area, and used multiple repetitions of values with two meters to achieve high precision.

  10. Preliminary isotopic studies of fluids from the Cerro Prieto geothermal field

    Science.gov (United States)

    Truesdell, A.H.; Rye, R.O.; Pearson, F.J.; Olson, E.R.; Nehring, N.L.; Whelan, J.F.; Huebner, M.A.; Coplen, T.B.

    1979-01-01

    Preliminary isotopic studies of Cerro Prieto geothermal fluids and earlier studies of Mexicali Valley ground waters suggest local recharge of the geothermal system from the area immediately to the west. Oxygen isotope exchange of water with reservoir rock minerals at temperatures increasing with depth has produced fluids with oxygen-18 contents increasing with depth, and pressure drawdown in the southeastern part of the field has allowed lower oxygen-18 fluids to invade the production aquifer from above. The contents of tritium and carbon-14 in the fluid suggest only that the age of the fluid is between 50 and 10,000 years. The isotopic compositions of carbon and sulfur are consistent with a magmatic origin of these elements but a mixed sedimentary-organic origin appears more likely for carbon and is also possible for sulfur. Investigations of the isotopic compositions of geothermal and cold ground waters continue and are being expanded as fluids become available and as separation and analysis methods are improved. ?? 1979.

  11. Numerical Studies of the Heat and Mass Transport in the Cerro Prieto Geothermal Field, Mexico

    Science.gov (United States)

    Lippmann, M. J.; Bodavarsson, G. S.

    1983-06-01

    Numerical simulation techniques are employed in studies of the natural flow of heat and mass through the Cerro Prieto reservoir, Mexico and of the effects of exploitation on the field's behavior. The reservoir model is a two-dimensional vertical east to west-southwest cross section, which is based on a recent hydrogeologic model of this geothermal system. The numerical code MULKOM is used in the simulation studies. The steady state pressure and temperature distributions are computed and compared against observed preproduction pressures and temperatures; a reasonable match is obtained. A natural hot water recharge rate of about 1×10-2 kg/s per meter of field length (measured in a north-south direction) is obtained. The model is then used to simulate the behavior of the field during the 1973-1978 production period. The response of the model to fluid extraction agrees to what has been observed in the field or postulated by other authors. There is a decrease in temperatures and pressures in the produced region. No extensive two-phase zone develops in the reservoir because of the strong fluid recharge. Most of the fluid recharging the system comes from colder regions located above and west of the produced reservoir.

  12. Gas chemistry and thermometry of the Cerro Prieto, Mexico, geothermal field

    Science.gov (United States)

    Nehring, N.L.; D'Amore, F.

    1984-01-01

    Gas compositions of Cerro Prieto wells in 1977 reflected strong boiling in the reservoir around wells M-20 and M-25. This boiling zone appeared to be collapsing in 1982 when a number of wells in this area of the field were shut-in. In 1977 and 1982, gas compositions also showed boiling zones corresponding to faults H and L postulated by Halfman et al. (1982). Four gas geothermometers were applied, based on reservoir equilibria and calculated fugacities. The Fisher - Tropsch reaction predicted high temperatures and appeared to re-equilibrate slowly, whereas the H2S reaction predicted low temperatures and appeared to re-equilibrate rapidly. Hydrogen and NH3 reactions were intermediate. Like gas compositions, the geothermometers reflected reservoir processes, such as boiling. Surface gas compositions are related to well compositions, but contain large concentrations of N2 originating from air dissolved in groundwater. The groundwater appears to originate in the east and flow over the production field before mixing with reservoir gases near the surface. ?? 1984.

  13. Subsidence and Stress Change in the Cerro Prieto Geothermal Field, B. C., Mexico

    Science.gov (United States)

    Glowacka, E.; Sarychikhina, O.; Nava, F. A.

    2005-11-01

    Previous works have shown that ground deformation and seismicity in the Cerro Prieto geothermal field (CPGF) are due to both tectonics and field exploitation. Here, we use information about current tectonics and data from precision leveling surveys, to model tectonic and anthropogenic subsidence. Our results show that tectonic subsidence constitutes only ˜4% of the measured subsidence. Anthropogenic subsidence was evaluated using a model of rectangular tensional cracks, based on the hydrological model of the field, together with the Coulomb 2.0 program. From the resulting values of the fissure parameters and from extraction and injection data, we calculate that the volume changes caused by closure of the geothermal and cold water reservoirs account for only ˜3% and ˜7%, respectively, of the volume change which should occur due to extraction. Since 18% of the extracted fluids are reinjected, external recharge must compensate for about 72% of the expected volume reduction. An analysis of the changes in Coulomb stress caused by exploitation of the geothermal field suggest that even though the anthropogenic stresses account for only a fraction of tectonic stresses, they are large enough to trigger seismicity.

  14. New mammalian records in the Parque Nacional Cerros de Amotape, northwestern Peru

    Directory of Open Access Journals (Sweden)

    Cindy M. Hurtado

    2015-04-01

    Full Text Available The Pacific Tropical Rainforest and Equatorial Dry Forest are found only in southern Ecuador and northern Peru, and are among the most poorly known ecosystems of South America. Even though these forests are protected in Parque Nacional Cerros de Amotape (PNCA, they are threatened by fragmentation because of farming and agriculture. The aim of this study was to determine the medium and large mammalian species richness, using transect census, camera trapping, and specimen bone collection. Nine transects were established and 21 camera trap stations were placed along 16 km2 in three localities of PNCA, from August 2012 to April 2013. Total sampling effort was 215 km of transects and 4077 camera-days. We documented 22 species; including 17 with camera trapping, 11 with transect census, and 10 with specimen collection.  Camera traps were the most effective method, and four species (Dasyprocta punctata, Cuniculus paca, Leopardus wiedii and Puma concolor were documented only with this method. This comprised the first Peruvian record for Dasyprocta punctata, and the first record for the western slope of the Peruvian Andes for Cuniculus paca. Also, both specimen collections and sightings confirm the presence of Potos flavus, first record in the western slope of the Peruvian Andes. Panthera onca, Tremarctos ornatus and Saimiri sciureus are considered locally extinct, while several species are in need of further research. We highlight the importance of the high diversity of this rainforests and encourage local authorities to give the area the highest priority in conservation.

  15. Soil mercury levels in the area surrounding the Cerro Prieto geothermal complex, MEXICO.

    Science.gov (United States)

    Pastrana-Corral, M A; Wakida, F T; García-Flores, E; Rodriguez-Mendivil, D D; Quiñonez-Plaza, A; Piñon-Colin, T D J

    2016-08-01

    Even though geothermal energy is a renewable energy source that is seen as cost-effective and environmentally friendly, emissions from geothermal plants can impact air, soil, and water in the vicinity of geothermal power plants. The Cerro Prieto geothermal complex is located 30 km southeast of the city of Mexicali in the Mexican state of Baja California. Its installed electricity generation capacity is 720 MW, being the largest geothermal complex in Mexico. The objective of this study was to evaluate whether the emissions generated by the geothermal complex have increased the soil mercury concentration in the surrounding areas. Fifty-four surface soil samples were collected from the perimeter up to an approximate distance of 7660 m from the complex. Additionally, four soil depth profiles were performed in the vicinity of the complex. Mercury concentration in 69 % of the samples was higher than the mercury concentration found at the baseline sites. The mercury concentration ranged from 0.01 to 0.26 mg/kg. Our results show that the activities of the geothermal complex have led to an accumulation of mercury in the soil of the surrounding area. More studies are needed to determine the risk to human health and the ecosystems in the study area.

  16. Research Experiences for Undergraduates at Cerro Tololo Inter-American Observatory

    Science.gov (United States)

    Hoard, D. W.; Smith, R. C.

    2000-12-01

    Each year, Cerro Tololo Inter-American Observatory (CTIO), located in La Serena, Chile, hosts a Research Experiences for Undergraduates (REU) Program funded by the National Science Foundation. In general, REU programs bring a group of undergraduate students to the host institute for 10 weeks, where they are teamed-up with staff members to perform research projects. Unlike REU programs at other U.S. institutions, the CTIO program takes place outside the United States and during the southern summer/northern winter months of January--March. This offers students not only a chance to perform research and participate in the day-to-day life at a major astronomical observatory, but also provides a unique exposure to a foreign culture and an option for students who can take advantage of a non-traditional work experience during the academic year. CTIO REU students also benefit from interaction with their Chilean counterparts participating in the Prácticas de Investigación en Astronomía, an REU-like program operated by CTIO for Chilean undergraduates. Since 1995, CTIO has hosted 20 REU students (with 4 more coming in 2001). Twenty (and counting) publications have resulted from CTIO REU projects. In addition, since 1999, 100% of the CTIO REU students have presented the results of their research projects at meetings of the American Astronomical Society. We present here an overview of the REU program at CTIO.

  17. Prototype of a Space Fluorescence Detector at Cerro La Negra Mountain Site

    Science.gov (United States)

    Cordero, A.; Robledo, C.; Moreno, E.; Salazar, H.; Martinez, O.; Villaseñor, L.; Zepeda, A.; Khrenov, B.; Garipov, G.

    2003-07-01

    The prototype of space fluorescence detector TUS (see V. Alexandrov et al., this conference) is begin prepared for operation at the mountain site Cerro La Negra (atmosphere depth 600g /cm2). The fluorescence detector (FD) field of view cover the atmosphere above the EAS array at the Pico de Orizaba site (see O. Martinez et al., this conference), separated from the FD by ˜ 5k m. At night at energies E0 > 0.05EeV both FD and EAS array will operate as an "hybrid detector." The range of atmosphere depths available for observation of EAS tracks by FD in hybrid mode is 200g /cm2. FD will also observe EAS tracks at energies of about 1 EeV at distances R=25-50 km, at zenith angles > 450 (when the atmosphere depth is more than 850g /cm2 ) with direction of tracks perpendicular to the FD axis. The FD design and preliminary data of the FD performance will be presented.

  18. Model for the heat source of the Cerro Prieto magma-hydrothermal system, Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Elders, W.A.; Bird, D.K.; Williams, A.E.; Schiffman, P.; Cox, B.

    1981-01-01

    Earlier studies at Cerro Prieto led to the development of a qualitative model for fluid flow in the geothermal system before it was drilled and perturbed by production. Current efforts are directed towards numerical modeling of heat and mass transfer in the system in this undisturbed state. This one-dimensional model assumes that the heat source was a single basalt/gabbro intrusion which provided heat to the system as it cooled. After compilation of various information of the physical properties of the reservoir, the enthalpy contained in two 1 cm thick sections across the reservoir orthogonal to each other was calculated. Various shapes, sizes and depths for the intrusion were considered as initial conditions and boundary conditions for the calculations of heat transfer. A family of numerical models which so far gives the best matches to the conditions observed in the field today have in common a funnel-shaped intrusion with a top 4 km wide emplaced at a depth of 5 km some 30,000 to 50,000 years ago, providing heat to the geothermal system.

  19. Hydrothermal flow regime and magmatic heat source of the Cerro Prieto geothermal system, Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Elders, W.A.; Bird, D.K.; Schiffman, P.; Williams, A.E.

    1984-01-01

    This detailed three-dimensional model of the natural flow regime of the Cerro Prieto geothermal field, before steam production began, is based on patterns of hydrothermal mineral zones and light stable isotopic ratios observed in rock samples from more than 50 deep wells, together with temperature gradients, wireline logs and other data. At the level so far penetrated by drilling, this hydrothermal system was heated by a thermal plume of water close to boiling, inclined at 45/sup 0/, rising from the northeast and discharging to the west. To the east a zone of cold water recharge overlies the inclined thermal plume. Fission track annealing studies show the reservoir reached 170/sup 0/C only 10/sup 4/ years ago. Oxygen isotope exchange data indicate that a 12 km/sup 3/ volume of rock subsequently reacted with three times its volume of water hotter than 200/sup 0/C. Averaged over the duration of the heating event this would require a flow velocity through a typical cross-section of the reservoir of about 6 m/year. The heat in storage in that part of the reservoir hotter than 200/sup 0/C and shallower than 3 km depth is equivalent to that which would be released by the cooling of about 1 or 2 km/sup 3/ of basalt or gabbro magma.

  20. Model of the heat source of the Cerro Prieto magma-hydrothermal system, Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Elders, W.A.; Bird, D.K.; Williams, A.E.; Schiffman, P.; Cox, B.

    1982-08-10

    Earlier studies at Cerro Prieto by UCR have led to the development of a qualitative model for field flow in the geothermal system before it was drilled and perturbed by production. Current efforts are directed towards numerical modelling of heat and mass transfer in the system in this undisturbed state. A two-dimensional model assumes that the heat sources were a single basalt/gabbro intrusion which provided heat to the system as it cooled. After compiling various information on the physical properties of the reservoir, the enthalpy contained in two 1cm thick section across the reservoir orthogonal to each other was calculated. Next various shapes, sizes and depths for the intrusion as initial conditions and boundary conditions for the calculation of heat transfer were considered. A family of numerical models which so far gives the best matches to the conditions observed in the field today have in common a funnel-shaped intrusion with a top 4km wide emplaced at a depth of 5km some 30,000 to 50,000 years ago, providing heat to the geothermal system. Numerical modelling is still in progress. Although none of the models so far computed may be a perfect match for the thermal history of the reservoir, they all indicate that the intrusive heat source is young, close and large.

  1. Application of oil-field well log interpretation techniques to the Cerro Prieto Geothermal Field

    Energy Technology Data Exchange (ETDEWEB)

    Ershaghi, I.; Phillips, L.B.; Dougherty, E.L.; Handy, L.L.

    1979-10-01

    An example is presented of the application of oil-field techniques to the Cerro Prieto Field, Mexico. The lithology in this field (sand-shale lithology) is relatively similar to oil-field systems. The study was undertaken as a part of the first series of case studies supported by the Geothermal Log Interpretation Program (GLIP) of the US Department of Energy. The suites of logs for individual wells were far from complete. This was partly because of adverse borehole conditions but mostly because of unavailability of high-temperature tools. The most complete set of logs was a combination of Dual Induction Laterolog, Compensated Formation Density Gamma Ray, Compensated Neutron Log, and Saraband. Temperature data about the wells were sketchy, and the logs had been run under pre-cooled mud condition. A system of interpretation consisting of a combination of graphic and numerical studies was used to study the logs. From graphical studies, evidence of hydrothermal alteration may be established from the trend analysis of SP (self potential) and ILD (deep induction log). Furthermore, the cross plot techniques using data from density and neutron logs may help in establishing compaction as well as rock density profile with depth. In the numerical method, R/sub wa/ values from three different resistivity logs were computed and brought into agreement. From this approach, values of formation temperature and mud filtrate resistivity effective at the time of logging were established.

  2. Unrest of Chiles - Cerro Negro volcanic complex: A binational Ecuador - Colombia effort

    Science.gov (United States)

    Ruiz, M. C.; Gomez, D.; Torres, R.; Cadena, O.; Mothes, P. A.; Anzieta, J. C.; Pacheco, D. A.; Bernard, B.; Acero, W.; Hidalgo, S.; Enriquez, W.; Cordova, A.

    2014-12-01

    The increasing seismic activity at the area of Chiles - Cerro Negro volcanic complex, located at the Ecuador-Colombian border, has been jointly monitored by the Instituto Geofisico - Ecuador and the Observatorio Vulcanologico y Sismologico de Pasto OVSP, a division of the Servicio Geologico Colombiano. Since April 2013, three seismic swarms have been detected in this area and more than 100.000 events are recorded since November 2013. The largest and more recent swarm has a daily average of 676 events between March and June 2014. Currently a seismic network of 8 seismic stations (5 in the Colombian and 3 in Ecuadorean side) are deployed in this area. Epicenters of more than 315 seismic events with magnitudes Ml>2.0 and 10 or more phases are located in an area 1-4 km south of Chiles volcano with shallow depths (up to 14 km). Most of events have magnitudes between 1.0 to 4.0. Nine events have magnitudes larger than 4.0 and the largest event occurred on April 30. 2014 with a local magnitude of 4.7 and inverse-transcurrent component focal mechanism. Waveforms and spectral patterns define these events as volcano-tectonic. Events with large magnitudes (above 3.0) show a very long-period component. Hot spring and deformation measurements also show signals of volcanic unrest.

  3. Measurements of air contaminants during the Cerro Grande fire at Los Alamos National Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Eberhart, Craig

    2010-08-01

    Ambient air sampling for radioactive air contaminants was continued throughout the Cerro Grande fire that burned part of Los Alamos National Laboratory. During the fire, samples were collected more frequently than normal because buildup of smoke particles on the filters was decreasing the air flow. Overall, actual sampling time was 96% of the total possible sampling time for the May 2000 samples. To evaluate potential human exposure to air contaminants, the samples were analyzed as soon as possible and for additional specific radionuclides. Analyses showed that the smoke from the fire included resuspended radon decay products that had been accumulating for many years on the vegetation and the forest floor that burned. Concentrations of plutonium, americium, and depleted uranium were also measurable, but at locations and concentrations comparable to non-fire periods. A continuous particulate matter sampler measured concentrations that exceeded the National Ambient Air Quality Standard for PM-10 (particles less than 10 micrometers in diameter). These high concentrations were caused by smoke from the fire when it was close to the sampler.

  4. 3-cerro y 4-mundo: los números del banquete en las ofrendas quechuas

    Directory of Open Access Journals (Sweden)

    David Lorente Fernández

    2010-12-01

    Full Text Available Las ofrendas quechuas del sur del Perú son platos alimenticios, banquetes destinados principalmente a la pachamama y los apus, pero también elaborados sistemas matemáticos regidos por operaciones sofisticadas. Sirviéndose de dos números fundamentales, el 3 y el 4, los especialistas rituales son capaces de transmitir mensajes polisémicos. Mediante el número 3 aglutinan clientes, parajes y cerros, en suma, «personas» capaces de interactuar entre sí. El 3 aparece en los k’intus de hojas de coca y en las oraciones que se recitan durante el proceso de realizar la ofrenda. Por el contrario, el número 4 no indica relaciones sino formas espaciales: es un operador geométrico que unifica la servilleta ceremonial (unk’uña, el papel envoltorio y el paquete acabado para representar las cuatro direcciones del mundo y hacer de la ofrenda un mundo en miniatura. Gracias a los dos números el ritualista puede recrear el cosmos, establecer convenios con los dioses y definir nuevas situaciones favorables para la vida de sus clientes.

  5. Characterization of the sodium layer at Cerro Pachon, and impact on laser guide star performance

    CERN Document Server

    Neichel, Benoit; Callingham, Joseph; Rigaut, Francois; Winge, Claudia; Trancho, Gelys; 10.1093/mnras/sts631

    2013-01-01

    Detailed knowledge of the mesopheric sodium layer characteristics is crucial to estimate and optimize the performance of Laser Guide Star (LGS) assisted Adaptive Optics (AO) systems. In this paper, we present an analysis of two sets of data on the mesospheric sodium layer. The first set comes from a laser experiment that was carried out at Cerro Tololo to monitor the abundance and altitude of the mesospheric sodium in 2001, during six runs covering a period of one year. This data is used to derive the mesospheric sodium column density, the sodium layer thickness and the temporal behavior of the sodium layer mean altitude. The second set of data was gathered during the first year of the Gemini MCAO System (GeMS) commissioning and operations. GeMS uses five LGS to measure and compensate for atmospheric distortions. Analysis of the LGS wavefront sensor data provides information about the sodium photon return and the spot elongation seen by the WFS. All these parameters show large variations on a yearly, nightly ...

  6. Sobre a perda da grandiloquência na literatura hispano-americana pós-noventa: notas sobre a des-representação do exílio em Lemebel e Bolaño

    Directory of Open Access Journals (Sweden)

    Pablo Gasparini

    2011-01-01

    Full Text Available The aim of this article is to analyze the transition from the political comprehension of the Hispanic-American Literature on the ’80 to another paradigm that involves speci fi c changes on the functions and characteristics of the literary discourse due to the Latin-American democratization and the strengthening of the mass culture. For this aim, will be done references to the exile representations on Respiración ar- ti fi cial by Ricardo Piglia; Loco afán. Crónicas de sidario by Pedro Lemebel, and 2666 and the short story “El Ojo Silva” by Roberto Bolaño.

  7. Alelos del complejo mayor de histocompatibilidad BoLA clase II asociados a la resistencia y susceptibilidad a Boophilus microplus en ganado bovino, Junín–Perú

    Directory of Open Access Journals (Sweden)

    M. Custodio Villanueva

    2011-01-01

    Full Text Available El objetivo del presente estudio fue identificar mediante la amplificación de microsatélites, los alelos del Complejo Mayor de Histocompatibilidad (CMH BoLA Clase II aso ciados a la resistencia y susceptibilidad a Boophilus microplus en ganado bovino, Junín – Perú. S e recolectaron muestra s de sangre de 47 bovinos , a sí como, ejemplares de B. microplus durante los meses de marzo, abril y mayo del 2009, en horas de la mañana, del lado derecho de cada animal. La extracción del ADN genómico se realizó por el método de Phil Summers (1995 y la amplificación de los microsatélites DRB3.2, DRB31 y BM1815 fue por PCR en un secuenciador automático. Los datos fueron evaluados mediante e l programa POPGEN 32. Se identificaron los alelos A, B y C relacionados con la resistencia y susceptibilidad a B. microplus en ganado bovino tanto en el locus BoLA DRB3.2 como en BoLA BM1815. Las frecuencias alélicas estimadas fueron: en el locus DRB3.2 la frecuencia del alelo A fue de 0 . 2742, del alelo B fue de 0.5000 y del alelo C fue de 0.2258; en el locus DRB31 la frecuencia del alelo A fue de 1.0000 y, en el locus BM1815 la frecuencia del alelo A fue de 0.3295, del alelo B fue de 0.5909y del alelo C fu e de 0.0795. Se concluye que los alelos A, B y C de los loci DRB3.2 y BM1815 del Complejo Mayor de Histocompatibilidad BoLA Clase II están relacionados con la resistencia a B. microplus en ganado bovino y el alelo A del locus DRB31 está relacionado con la susceptibilidad.

  8. Cicatrices y tormentas: el pasado en cuestión. Memoria post-dictatorial en Nocturno de Chile de Bolaño y en crónicas de Lemebel

    Directory of Open Access Journals (Sweden)

    Ludmila Sol Vergini

    2013-06-01

    Full Text Available Following Nelly Richard’s point of view about the closure of dictatorial past held out by the rhetoric of consensus in Chilean Transition to democracy, this paper examines two literary responses to this closure. On the one hand, Lemebel’s chronicles claim a place for collective memory of the silenced in public space. On the other hand, Bolaño’s novel, Nocturno de Chile, subverts the dictatorial official memory from within. In both cases, the interpretation of the past is problematized, contributing to keep memory alive.

  9. Estrategia didáctica para introducir las coordenadas polares y sus aplicaciones en la representación y análisis de la parábola y la elipse

    OpenAIRE

    Pérez Acuña, Urías José

    2014-01-01

    El presente trabajo muestra una Unidad Didáctica para introducir las coordenadas polares a estudiantes de grado 11 de educación media, y la posterior aplicación del plano polar para representar y analizar la parábola y la elipse. La propuesta consta de cuatro grupos (4) de actividades en donde se articulan elementos de la Educación Matemática Realista y las teorías de Brousseau y Chevallard relacionadas con el proceso de enseñanza-aprendizaje de las matemáticas. Los conceptos básicos de ...

  10. Discurso, poder e institucionalidad: canon, cánones y canonización. El caso Bolaño, desde una perspectiva diacrónica

    Directory of Open Access Journals (Sweden)

    Horacio Gabriel M. Simunovic Díaz

    2015-06-01

    Full Text Available El estudio propuesto intenta ofrecer una entrada parcial pero ilustrativa del fenómeno de canonización de la figura autorial de Roberto Bolaño y su obra, desde una perspectiva sistémica, valorativa y diacrónica. El supuesto básico de este trabajo es que la lengua es un sistema social y una red de recursos de construcción de significado que se instancia a través de múltiples textos, surgidos según condiciones contextuales determinadas, orientados a la consecución de metas específicas y constreñidos por valores y reglas institucionales que determinan su funcionamiento, orientación, circulación y predominancia. Se utiliza el enfoque lingüístico sistémico-funcional como marco teórico y se recurre a algunas de sus herramientas analíticas (sistemas de valoración o appraisal para explicar los significados interpersonales cristalizados en un texto crítico literario que sirve de ejemplo del tipo de discursos integrantes del proceso dinámico y conflictivo de formación de cánones literarios. El análisis demuestra que el texto presenta un compromiso mayoritariamente heteroglósico, pero realizado a través de uno de sus mecanismos menos explícitos y democráticos: la legislación.

  11. Brote de Fiebre Hemorrágica por el virus del Ébola en Uganda Hemorrhagic Fever outbreak due to Ebola virus in Uganda

    Directory of Open Access Journals (Sweden)

    MªC. Aríñez Fernández

    2012-03-01

    Full Text Available En Uganda se está llevando a cabo la Misión de la Unión Europea (EUTM Somalia, en la que participan efectivos de las Fuerzas Armadas españolas. En mayo de 2011 el Ministerio de Sanidad de Uganda notificó un brote de fiebre hemorrágica por el virus del bola a 70 km de distancia de Kampala. El caso índice y único caso confirmado, fue una niña de 12 años que falleció. La investigación epidemiológica se llevó a cabo por un equipo internacional que incluyó personal del Ministerio de Sanidad de Uganda y de la OMS. Tras mantener la vigilancia del brote durante un tiempo igual a dos veces el periodo de incubación y no confirmar otros casos, fue declarado finalizado el brote el 17 de junio de 2011. Se distribuyó información sobre el brote y recomendaciones de actuación tanto a profesionales de la salud como a la población general.The European Mission (EUTM Somalia is being conducted in Uganda. Military personnel of the Spanish Armed Forces participate in that mission. On 13 May 2011, The Ministry of Health of Uganda notified a case of Ebola hemorrhagic fever in a district 70 kilometers far from Kampala. The index case and only confirmed case, was a 12-year-old girl who finally died. Epidemiologic surveillance was conducted by an international team including representatives of the Ugandan Ministry of Health and WHO. The Ministry of Health of Uganda declared the end of the outbreak on the 17 June 2011, since the epidemiological investigations, including twofold the incubation period surveillance, did not confirm new cases. Guidelines to control the outbreak and information on the disease were distributed to health professionals and general population.

  12. El proceso de escolarización en la provincia de Almería (1850-1900

    Directory of Open Access Journals (Sweden)

    Pilar BALLARÍN DOMINGO

    2010-03-01

    Full Text Available RESUMEN: Queremos, en este trabajo, presentar un aspecto histórico que aporte nuevos elementos de análisis a las causas del persistente subdesarrollo de la provincia de Almería.

  13. 德昌水牛Bola-DRB3基因第二外显子的PCR-RFLP多态性研究%Study on the Polymorphism of the Bola-DRB3 Gene exon 2 in Dechang Buffalo by the PCR-RFLP Method

    Institute of Scientific and Technical Information of China (English)

    陈智华; 顾磊; 钟金城

    2007-01-01

    本研究应用PCR-RFLP方法,对德昌水牛MHCⅡ类基因座位的Bola-DRB3基因第2外显子进行了遗传多态性研究.结果表明:HaeⅢ酶切出现7种基因型,即AA、AB、AD、BC、AC、BF和BB,共有A、B、C、D、F 5个复等位基因控制;AA型的频率最高,为优势基因型,A基因为优势基因.RsaⅠ酶切结果出现3种基因型,即GH、GG、HH,共有G、H 2个基因控制;GG的频率最高,为优势基因型,G基因为优势基因.这表明德昌水牛在Bola-DRB3基因第2外显子上具有丰富的多态性.在RsaⅠ酶切位点上,德昌水牛未达到Hardy-Weiberg平衡状态,显示在群体中有选择、基因突变、近交、遗传漂变等因素的一定影响,这是对保种极为不利的,应引起畜牧工作者的关注.在德昌水牛遗传资源的开发利用和保存中,作者认为应严格划定杂交改良和保种区的范围;在杂交改良区内可以进行选育、品种间杂交,充分利用杂种优势,提高其生产性能;而在保种区或群中不进行杂交,同时减少选育;使德昌水牛遗传资源的有效保存和充分利用有机的结合起来.

  14. Aplicación web sobre los diversos perfiles de mercado en las provincias de Canadá

    OpenAIRE

    Caicedo Castro, Paula Andrea; Argumedo, Juliana

    2014-01-01

    El proyecto de creación de una Aplicación web sobre los diferentes perfiles de mercado de las provincias canadienses, consiste en la recopilación de información de diversas fuentes académicas, con el fin de crear una guía electrónica que permita a los exportadores colombianos tener información precisa y actualizada sobre cada una de las provincias canadienses.

  15. Mortalitá per tumori nella Provincia di Palermo (anno 2000

    Directory of Open Access Journals (Sweden)

    R. Cusimano

    2003-05-01

    Full Text Available

    Obiettivi: in Italia la percentuale di popolazione coperta da Registri Tumori nel meridione è inferiore rispetto alle aree del centro-nord: la disponibilità di dati aggiornati di mortalità per tumori nella Provincia di Palermo (1 milione e 250mila abitanti di cui 700mila residenti nella città di Palermo acquista in tale contesto il duplice significato di indicatore di morbosità, al fine di valutare le risorse necessarie a questo settore dell’assistenza sanitaria, e di elemento informativo per la prossima realizzazione del Registro Tumori della Provincia di Palermo.

    Materiali e metodi: dal Registro delle Cause di morte dell’anno 2000 sono stati identificati, per i deceduti residenti a Palermo e negli 81 comuni della Provincia (morti nel comune di residenza o in comune diverso, i record relativi ai codici compresi tra 140 e 239 (Settore II, Tumori della IX Revisione della Classificazione Internazionale delle Malattie. Sono stati calcolati i tassi di mortalità specifici per sesso ed età utilizzando la popolazione residente al 1/1/2000 (ISTAT e i tassi standardizzati utilizzando la popolazione italiana al censimento del 1981. Risultati: nel 2000 nella Provincia di Palermo sono stati osservati 2863 decessi per tumore (1636 maschi e 1227 femmine. Il tasso di mortalità standardizzato è risultato pari a 231.5/100mila nei maschi e 169.7/100mila nelle femmine. Nel comune di Palermo la mortalità è superiore a quella osservata nei comuni della provincia, sia nei maschi (276.8 vs 187.4 che nelle femmine (180.0 vs 158.8

    Conclusioni: i dati di mortalità per tumore costituiscono un importante indicatore di morbosità, particolarmente in assenza di dati di incidenza. L’osservazione che la provincia di Palermo mostra una mortalità per tumori simile a quella riportata dai Registri del centro Italia (Macerata, Umbria, Sassari e superiore a quella riportata dal Registro di Ragusa

  16. Evolution of the CP-I sector of the Cerro Prieto geothermal reservoir, BC, and exploitation alternatives; Evolucion del sector CP-I del yacimiento geotermico de Cerro Prieto, BC, y alternativas de explotacion

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Rodriguez, Marco Helio [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Residencia General de Cerro Prieto, Mexicali, Baja California (Mexico)]. E-mail: marco.rodriguez01@cfe.gob.mx

    2010-01-15

    After 35 years of exploitation of the CP-I (Cerro Prieto I) sector of the Cerro Prieto geothermal field, its thermal conditions have been declined substantially; the number of production wells is reduced and exploitation has been abandoned in some zones. However with a binary cycle, it is still possible to generate electricity from the remaining reservoir energy. To do so, one needs to know a detailed reservoir history of the sector, identifying the best potential strata to be assessed. In this paper, the CP-I reservoir evolution is presented and its exploitation and main reservoir characteristics -which play important roles- are identified. The CP-I zones offering the best conditions for binary cycle exploitation are identified. Exploiting partially abandoned reservoir sections is crucial for the future of the field. If such sections can be made to produce, this will help reduce the progressive steam-production decline in the occurring since production began. The production decline had been mitigated by a large area available for drilling replacement production wells, but such an area is limited now, due to the vast number of operating wells. [Spanish] Despues de 35 anos de explotacion del yacimiento en el sector de CP-I (Cerro Prieto I) del campo geotermico de Cerro Prieto, BC, sus condiciones termicas han declinado considerablemente, por lo que el numero de pozos productores ha disminuido, dejando algunas zonas abandonadas a la explotacion. Sin embargo, aun es posible aprovechar la energia que contiene este sector del yacimiento para la generacion de electricidad mediante ciclo binario. Para ello primeramente se debe conocer en detalle cual ha sido la evolucion del yacimiento en este sector, identificando los estratos de mejor potencial para evaluarlos posteriormente. En este estudio se presenta la evolucion del yacimiento de CP-I como respuesta a su explotacion, identificando las principales caracteristicas del yacimiento que determinan su comportamiento. Asi

  17. Update of the basement model of the Cerro Prieto, B. C., geothermal field, Mexico; Actualizacion del modelo del basamento en el campo geotermico de Cerro Prieto, B.C., Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Lopez, Macario [Residencia General de Cerro Prieto, Comision Federal de Electricidad, Mexicali, Baja California (Mexico)

    1999-04-01

    With the aim to actualize the basement model of the Cerro Prieto Geothermal Field, a gravity interpretation has been held. We modeled in 2.5 D, nine profiles traced over the Bouguer anomaly map. Well data concerning lithology and density changes were used to fit the gravity models. Results of this work confirm that the geometry of the basement of Cerro Prieto, corresponds to a structural sequence. From west to east it starts as a big depression, continues with a strong uplift of the basement in the middle sector and finally deepens eastward in steps. The basement model proposed in the present work, defines a similar trend to that established by Fonseca y Razo (1980), but there are differences in basement depth in some areas. In the present model we interpret basement depths between 200 and 400 m deeper than in previous models to the south and northwest of the actual exploitation zone. [Spanish] Con el fin de actualizar el modelo del basamento en el Campo Geotermico de Cerro Prieto, se realizo una reinterpretacion gravimetrica, modelando en 2.5 D, 9 perfiles trazados sobre el mapa de anomalia de Bouguer. Utilizando la informacion litologica obtenida a traves de numerosas perforaciones profundas, se hicieron coincidir, dentro de los mofelos gravimetricos, las principales variaciones litologicas con cambios en la densidad. Los resultados de este trabajo reiteran que la geometria del basamento del Campo de Cerro Prieto, vista de W a E, corresponde con una secuencia estructural que se inicia con una gran depresion en el W, continua con un fuerte levantamiento y finalmente se extiende con una tendencia a profundizarse hacia el E de forma escalonada. El modelo de basamento derivado del presente trabajo, define una tendencia muy similar al modelo de basamento establecido (Fonseca y Razo, 1980), pero difiere en cuanto a la profundidad en algunos sectores del campo. En el actual trabajo se interpreta una profundidad entre 200 y 400 m mayor hacia el sur y noroeste de la

  18. Criteria to determine the depth of the production interval in wells of the Cerro Prieto geothermal field, Mexico; Criterios para determinar la profundidad del intervalo productor en pozos del campo geotermico de Cerro Prieto, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Leon Vivar, Jesus Saul de [Comision Federal de Electricidad, Residencia General de Cerro Prieto, Mexicali, B.C. (Mexico)]. E-mail: jesus.deleon@cfe.gob.mx

    2006-07-15

    Ways to select the depth of the production interval or to complete wells in the Cerro Prieto geothermal field have changed during the development of the field. From 1961 when drilling began to the middle of 2005, a total of 325 wells were drilled. The paper compares the approaches used in the past with those of the last ten years. The Cerro Prieto system has been classified as being of liquid-dominated and high-temperature. Today, after 33 years of commercial exploitation, it has experienced a series of thermal and geochemical fluid changes making it necessary to modify the ways to select the depth of the well production intervals, according to the observed behavior of the reservoir. The new criteria include the thermal approach, the geological approach, the geochemical approach and a comparative approach with neighboring wells. If most of these criteria are interpreted correctly, the success of a well is ensured. [Spanish] Los criterios para seleccionar la profundidad del intervalo productor o la terminacion de los pozos en el campo geotermico de Cerro Prieto han cambiado durante el desarrollo del mismo. De 1961, cuando se perforaron los primeros pozos, hasta mediados del 2005 se han perforado un total de 325 pozos. En el presente articulo se hara una breve revision de cuales han sido los criterios usados en el pasado y los que se han venido empleando en los ultimos diez anos. El yacimiento de Cerro Prieto ha sido clasificado como de liquido dominante, de alta temperatura, pero actualmente, despues de 33 anos de explotacion comercial, ha sufrido una serie de cambios termicos y geoquimicos en sus fluidos, por lo que ha sido necesario modificar los criterios para seleccionar la profundidad del intervalo productor de los pozos de acuerdo al comportamiento observado en el yacimiento. Los criterios actuales se dividen en cuatro: 1. Criterio termico, 2. Criterio geologico, 3. Criterio geoquimico y 4. Criterio comparativo de los pozos vecinos. Cuando la mayoria de estos

  19. Petrografía y geoquímica del magmatIsmo cretácico superior-eoceno en el área de PichaIhue, provincia de Neuquén

    Directory of Open Access Journals (Sweden)

    M. Paula Mateo Fernández Caso

    2011-06-01

    Full Text Available Hacia fines del Mesozoico, en el sector noroeste de la provincia de Neuquén se desarrolló un magmatismo asociado a la evolución y migración del arco andino desde los 36º40' hasta los 38º20' de latitud sur. En base a estudios petrológicos, se caracterizaron facies hipabisales y extrusivas que afloran en el área de Pichaihue. Las primeras están compuestas por andesitas que se emplazan como lacolitos, diques o filones capa intruyendo las secuencias sedimentarias mesozoicas. También se reconocen afloramientos de basaltos. Las facies extrusivas están constituidas principalmente por coladas brechosas, coladas masivas y pequeños domos. La geoquímica evidencia una impronta calcoalcalina, de arco volcánico, con una corteza de espesor normal y patrones de elementos traza que sugieren una misma fuente. Dentro del marco regional, se pueden distinguir tres grupos: los diques del cerro Mocho con alto contenido en Ti y mayor relación Sm/Yb, magmatismo cretácico superior-paleoceno al que pertenecen las facies extrusivas (Andesita Rivera y un evento eoceno al cual corresponden las facies hipabisales (Diques de Colipilli. Por último, la presencia de estas rocas en este segmento de los Andes evidencia una importante migración hacia el este del arco volcánico cretácico superior-eoceno indicando su posición más oriental.

  20. Validating numerical simulations of snow avalanches using dendrochronology: the Cerro Ventana event in Northern Patagonia, Argentina

    Directory of Open Access Journals (Sweden)

    A. Casteller

    2008-05-01

    Full Text Available The damage caused by snow avalanches to property and human lives is underestimated in many regions around the world, especially where this natural hazard remains poorly documented. One such region is the Argentinean Andes, where numerous settlements are threatened almost every winter by large snow avalanches. On 1 September 2002, the largest tragedy in the history of Argentinean mountaineering took place at Cerro Ventana, Northern Patagonia: nine persons were killed and seven others injured by a snow avalanche. In this paper, we combine both numerical modeling and dendrochronological investigations to reconstruct this event. Using information released by local governmental authorities and compiled in the field, the avalanche event was numerically simulated using the avalanche dynamics programs AVAL-1D and RAMMS. Avalanche characteristics, such as extent and date were determined using dendrochronological techniques. Model simulation results were compared with documentary and tree-ring evidences for the 2002 event. Our results show a good agreement between the simulated projection of the avalanche and its reconstructed extent using tree-ring records. Differences between the observed and the simulated avalanche, principally related to the snow height deposition in the run-out zone, are mostly attributed to the low resolution of the digital elevation model used to represent the valley topography. The main contributions of this study are (1 to provide the first calibration of numerical avalanche models for the Patagonian Andes and (2 to highlight the potential of Nothofagus pumilio tree-ring records to reconstruct past snow-avalanche events in time and space. Future research should focus on testing this combined approach in other forested regions of the Andes.

  1. The CCAT-prime Extreme Field-of-View Submillimeter Telescope on Cerro Chajnantor

    Science.gov (United States)

    Koopman, Brian; Bertoldi, Frank; Chapman, Scott; Fich, Michel; Giovanelli, Riccardo; Haynes, Martha P.; Herter, Terry L.; Murray, Norman W.; Niemack, Michael D.; Riechers, Dominik; Schilke, Peter; Stacey, Gordon J.; Stutzki, Juergen; CCAT-prime Collaboration

    2017-01-01

    CCAT-prime is a six meter aperture off-axis submillimeter telescope that we plan to build at 5600m elevation on Cerro Chajnantor in Chile. The CCAT-prime optics are based on a cross-Dragone design with high throughput and a wide field-of-view optimized to increase the mapping speed of next generation cosmic microwave background (CMB) observations. These characteristics make CCAT-prime an excellent platform for a wide range of next generation millimeter and submillimeter science goals, and a potential platform for CMB stage-IV measurements. Here we present the telescope design for CCAT-prime and review the science goals.Taking advantage of the high elevation site, the first generation instrument for CCAT-prime will measure seven different frequency bands from 350um to 3mm. These seven bands will enable precise measurements of the Sunyaev-Zel’dovich effects (SZE) by separating contributions from CMB, thermal SZE, kinetic SZE, bright submm galaxies, and radio sources with a goal of extracting the peculiar velocities from a large number of galaxy clusters. Additional science priorities for CCAT-prime include: Galactic Ecology studies of the dynamic intersteller medium by mapping the fine structure lines [CI], [CII] and [NII] as well as high-excitation CO lines at the shortest wavelength bands; high redshift intensity mapping of [CII] emission from star-forming galaxies that likely dominates cosmic reionization at z~5-9 to probe the Epoch of Reionization; and next generation CMB polarization measurements to constrain inflation and cosmological models. The CCAT-prime facility will further our understanding of astrophysical processes from moments after the Big Bang to the present-day evolution of the Milky Way.

  2. Planning and Analysis of Fractured Rock Injection Tests in the Cerro Brillador Underground Laboratory, Northern Chile

    Science.gov (United States)

    Fairley, J. P., Jr.; Oyarzún L, R.; Villegas, G.

    2015-12-01

    Early theories of fluid migration in unsaturated fractured rock hypothesized that matrix suction would dominate flow up to the point of matrix saturation. However, experiments in underground laboratories such as the ESF (Yucca Mountain, NV) have demonstrated that liquid water can migrate significant distances through fractures in an unsaturated porous medium, suggesting limited interaction between fractures and unsaturated matrix blocks and potentially rapid transmission of recharge to the sat- urated zone. Determining the conditions under which this rapid recharge may take place is an important factor in understanding deep percolation processes in arid areas with thick unsaturated zones. As part of an on-going, Fondecyt-funded project (award 11150587) to study mountain block hydrological processes in arid regions, we are plan- ning a series of in-situ fracture flow injection tests in the Cerro Brillador/Mina Escuela, an underground laboratory and teaching facility belonging to the Universidad la Serena, Chile. Planning for the tests is based on an analytical model and curve-matching method, originally developed to evaluate data from injection tests at Yucca Mountain (Fairley, J.P., 2010, WRR 46:W08542), that uses a known rate of liquid injection to a fracture (for example, from a packed-off section of borehole) and the observed rate of seepage discharging from the fracture to estimate effective fracture aperture, matrix sorptivity, fracture/matrix flow partitioning, and the wetted fracture/matrix interac- tion area between the injection and recovery points. We briefly review the analytical approach and its application to test planning and analysis, and describe the proposed tests and their goals.

  3. Carbon-13 variations in fluids from the Cerro Prieto geothermal system

    Energy Technology Data Exchange (ETDEWEB)

    Janik, C.J.; Nehring, N.L.; Huebner, M.A.; Truesdell, A.H.

    1982-08-10

    The carbon isotope compositions of CO/sub 2/ in steam from Cerro Prieto production well have been measured for 1977, 1979, and 1982. Variations in the delta/sup 13/C values are caused by production-related changes in the chemical and physical parameters of the geothermal system. In 1977, most CO/sub 2/ in the reservoir was isotopically light (delta/sup 13/C = -6.4 +/- 0.4). Heavier CO/sub 2/ was produced from wells in the center of the field (M5,M26,M27) due to deposition of isotopically light calcite caused by near-well boiling. In 1979 nearly all well showed relatively heavy CO/sub 2/, probably due to expansion of aquifer boiling and calcite precipitation. In 1982, many wells in the central part of the field were shut in. The amount of drawndown decreased and as temperatures and pressures near the wells increased, the boiling zones collapsed. The CO/sub 2/ in the fluid then exchanged with the precipitated calcite and became isotopically lighter. The sensitivity of carbon isotopes to calcite precipitations caused by aquifer boiling and to reequilibration with this deposited calcite upon decrease of boiling suggests use as an indicator of these aquifer processes. Surficial CO/sub 2/ of thermal origin was collected in 1981. Generally, the carbon-13 contents were close to CO/sub 2/ from production wells except for high-temperature mud pots and fumaroles containing isotopically light CO/sub 2/ derived from near surface alteration of organic matter.

  4. Mexicali aquifer and its relation with the Colorado river and the Cerro Prieto geothermal reservoir

    Science.gov (United States)

    Ramirez-Hernandez, J.; Reyes-Lopez, J. A.; Carreon-Diazconti, C.; Lazaro-Mancilla, O.

    2008-05-01

    Until some years ago the Colorado River has been the main recharge source of the Mexicali and the Imperial Valley aquifers. River discharge interruption after the constructions of dams upstream (i.e. Parker, Davis and Hoover) and the creation of great irrigation systems in both Valleys have modified their dynamics. Currently, the distribution of water recharge is the network of irrigation and drainage channels that distribute water to more than 500.000 ha. The chemical quality of the recharge water also has changed because the irrigation run-off water has become more mineralized. On the other hand, the intense steam exploitation of the Cerro Prieto geothermal reservoir has inverted the flow direction from the Volcano Lagoon area that until the 60s constituted the discharge zone of the aquifer and the geothermal reservoir. In this work, changes in the aquifer water recharge regime, the phreatic level and the water chemical quality are analyzed. It was found that after the reduction of the annual water extraction from aquifer up to 750X106 m3, the static levels have reached a dynamic balance that could be altered if water seepage from the irrigation channels, specially from the All American Channel, is reduced. The total dissolved solids (TDS) concentration has increased from 1000 ppm in 1970 to 1800 ppm in 2005. The water of recent infiltration, the gradual cooling of the shallowest strata of the geothermal reservoir, and the almost total disappearance of the hydrothermal surface manifestations are evidences of groundwater flow inversion. The new source of groundwater recharge due to seepage of evaporation disposal geothermal brine pond is documented. This pond incorporates water with a very different chemical composition to the groundwater system. Therefore, mineralization of the shallow aquifer layers and the soil contamination process are identified. It was concluded that the aquifer hydrodynamics in the Valley of Mexicali depends on the irrigation system more

  5. Regional and local networks of horizontal control, Cerro Prieto geothermal area

    Science.gov (United States)

    Massey, B.L.

    1979-01-01

    The Cerro Prieto geothermal area in the Mexicali Valley 30 km southeast of Mexicali, Baja California, is probably deforming due to (1) the extraction of large volumes of steam and hot water, and (2) active tectonism. Two networks of precise horizontal control were established in Mexicali Valley by the U.S. Geological Survey in 1977 - 1978 to measure both types of movement as they occur. These networks consisted of (1) a regional trilateration net brought into the mountain ranges west of the geothermal area from survey stations on an existing U.S. Geological Survey crustal-strain network north of the international border, and (2) a local net tied to stations in the regional net and encompassing the area of present and planned geothermal production. Survey lines in this net were selected to span areas of probable ground-surface movements in and around the geothermal area. Electronic distance measuring (EDM) instruments, operating with a modulated laser beam, were used to measure the distances between stations in both networks. The regional net was run using a highly precise long-range EDM instrument, helicopters for transportation of men and equipment to inaccessible stations on mountain peaks, and a fixed wing airplane flying along the line of sight. Precision of measurements with this complex long-range system approached 0-2 ppm of line length. The local net was measured with a medium-range EDM instrument requiring minimal ancillary equipment. Precision of measurements with this less complex system approached 3 ppm for the shorter line lengths. The detection and analysis of ground-surface movements resulting from tectonic strains or induced by geothermal fluid withdrawal is dependent on subsequent resurveys of these networks. ?? 1979.

  6. Validating numerical simulations of snow avalanches using dendrochronology: the Cerro Ventana event in Northern Patagonia, Argentina

    Science.gov (United States)

    Casteller, A.; Christen, M.; Villalba, R.; Martínez, H.; Stöckli, V.; Leiva, J. C.; Bartelt, P.

    2008-05-01

    The damage caused by snow avalanches to property and human lives is underestimated in many regions around the world, especially where this natural hazard remains poorly documented. One such region is the Argentinean Andes, where numerous settlements are threatened almost every winter by large snow avalanches. On 1 September 2002, the largest tragedy in the history of Argentinean mountaineering took place at Cerro Ventana, Northern Patagonia: nine persons were killed and seven others injured by a snow avalanche. In this paper, we combine both numerical modeling and dendrochronological investigations to reconstruct this event. Using information released by local governmental authorities and compiled in the field, the avalanche event was numerically simulated using the avalanche dynamics programs AVAL-1D and RAMMS. Avalanche characteristics, such as extent and date were determined using dendrochronological techniques. Model simulation results were compared with documentary and tree-ring evidences for the 2002 event. Our results show a good agreement between the simulated projection of the avalanche and its reconstructed extent using tree-ring records. Differences between the observed and the simulated avalanche, principally related to the snow height deposition in the run-out zone, are mostly attributed to the low resolution of the digital elevation model used to represent the valley topography. The main contributions of this study are (1) to provide the first calibration of numerical avalanche models for the Patagonian Andes and (2) to highlight the potential of textit{Nothofagus pumilio} tree-ring records to reconstruct past snow-avalanche events in time and space. Future research should focus on testing this combined approach in other forested regions of the Andes.

  7. Temporal Evolution of a Seismic Swarm at Chiles - Cerro Negro volcanic complex

    Science.gov (United States)

    Ruiz, Mario

    2015-04-01

    The increasing seismic activity in the area of the Chiles - Cerro Negro volcanic complex, located on the Ecuador-Colombian border, has been jointly monitored by the Instituto Geofisico - Ecuador and the Observatorio Vulcanologico y Sismologico de Pasto (OVSP), a division of the Servicio Geologico Colombiano. Since April 2013, three seismic swarms have been detected in this area, and more than 400.000 events have been recorded since November 2013. The largest and most recent swarm has a daily average of 3894 events between March and the 12th of December 2014. Currently a seismic network of 13 short- and broad-band stations (5 Colombian, 8 Ecuadorian) was deployed in this area. High quality epicenters of seismic events with magnitudes Ml>2.0, RMSChiles volcano with shallow depths (up to 14 km). Most events have magnitudes between 1.0 to 4.0. Fifteen events have magnitudes larger than 4.0 including an event that occurred on October 20, 2014. This event had a local magnitude of 5.7 and an oblique (strike-slip with some thrusting) focal mechanism. Waveforms and spectral patterns define these events as volcano-tectonic. However, events with moderate to large magnitudes (above 3.0) contain pronounced very-long-period components. Position time series recorded by a dual-frequency GPS receiver at the SE flank of Chiles show a slight departure from the normal tectonic trend beginning with the appearance of the last seismic swarm on or around September 30, 2014. This trend is subsequently punctuated by a sharp deformation transient related to the coseismic displacement of the October 20 event. After more than a year of very anomalous seismic activity and concurrent minor deformation, no evidence of surficial volcanic activity has been documented.

  8. Shallow earthquake inhibits unrest near Chiles-Cerro Negro volcanoes, Ecuador-Colombian border

    Science.gov (United States)

    Ebmeier, Susanna K.; Elliott, John R.; Nocquet, Jean-Mathieu; Biggs, Juliet; Mothes, Patricia; Jarrín, Paúl; Yépez, Marco; Aguaiza, Santiago; Lundgren, Paul; Samsonov, Sergey V.

    2016-09-01

    Magma movement or reservoir pressurisation can drive swarms of low-magnitude volcano-tectonic earthquakes, as well as occasional larger earthquakes (>M5) on local tectonic faults. Earthquakes >M5 near volcanoes are challenging to interpret in terms of evolving volcanic hazard, but are often associated with eruptions, and in some cases enhance the ascent of magma. We present geodetic observations from the first episode of unrest known to have occurred near Chiles and Cerro Negro de Mayasquer volcanoes on the Ecuador-Colombian border. A swarm of volcano-tectonic seismicity in October 2014 culminated in a Mw 5.6 earthquake south of the volcanoes. Satellite radar data spanning this earthquake detect displacements that are consistent with dextral oblique slip on a reverse fault at depths of 1.4-3.4 km within a SSW-NNE trending fault zone that last ruptured in 1886. GPS station measurements capture ∼20 days of uplift before the earthquake, probably originating from a pressure source ∼10-15 km south of Volcán Chiles, at depths exceeding 13 km. After the Mw 5.6 earthquake, uplift ceased and the rate of seismicity began to decrease. Potential mechanisms for this decline in activity include a decrease in the rate of movement of magma into the shallow crust, possibly caused by the restriction of fluid pathways. Our observations demonstrate that an earthquake triggered during volcanic unrest can inhibit magmatic processes, and have implications for the hazard interpretation of the interactions between earthquakes and volcanoes.

  9. Structural control on geothermal circulation in the Cerro Tuzgle-Tocomar geothermal volcanic area (Puna plateau, Argentina)

    Science.gov (United States)

    Giordano, Guido; Pinton, Annamaria; Cianfarra, Paola; Baez, Walter; Chiodi, Agostina; Viramonte, José; Norini, Gianluca; Groppelli, Gianluca

    2013-01-01

    The reconstruction of the stratigraphical-structural framework and the hydrogeology of geothermal areas is fundamental for understanding the relationships between cap rocks, reservoir and circulation of geothermal fluids and for planning the exploitation of the field. The Cerro Tuzgle-Tocomar geothermal volcanic area (Puna plateau, Central Andes, NW Argentina) has a high geothermal potential. It is crossed by the active NW-SE trans-Andean tectonic lineament known as the Calama-Olacapato-Toro (COT) fault system, which favours a high secondary permeability testified by the presence of numerous springs. This study presents new stratigraphic and hydrogeological data on the geothermal field, together with the analysis from remote sensed image analysis of morphostructural evidences associated with the structural framework and active tectonics. Our data suggest that the main geothermal reservoir is located within or below the Pre-Palaeozoic-Ordovician basement units, characterised by unevenly distributed secondary permeability. The reservoir is recharged by infiltration in the ridges above 4500 m a.s.l., where basement rocks are in outcrop. Below 4500 m a.s.l., the reservoir is covered by the low permeable Miocene-Quaternary units that allow a poor circulation of shallow groundwater. Geothermal fluids upwell in areas with more intense fracturing, especially where main regional structures, particularly NW-SE COT-parallel lineaments, intersect with secondary structures, such as at the Tocomar field. Away from the main tectonic features, such as at the Cerro Tuzgle field, the less developed network of faults and fractures allows only a moderate upwelling of geothermal fluids and a mixing between hot and shallow cold waters. The integration of field-based and remote-sensing analyses at the Cerro Tuzgle-Tocomar area proved to be effective in approaching the prospection of remote geothermal fields, and in defining the conceptual model for geothermal circulation.

  10. Surface Deformation Associated with Geothermal Fluids Extraction at the Cerro Prieto Geothermal Field, Baja California, Mexico Revealed by DInSAR Technique

    Science.gov (United States)

    Sarychikhina, O.; Glowacka, E.; Mojarro, J.

    2016-08-01

    The Differential Synthetic Aperture Radar Interferometry (DInSAR) is widely used for surface deformation detection and monitoring.In this paper, ERS-1/2, ENVISAT and RADARSAT-2 synthetic aperture radar (SAR) images acquired between 1993 and 2014 were processed to investigate the evolution of surface deformation at the Cerro Prieto geothermal field, Baja California, Mexico. The conventional DInSAR together with the interferogram stacking method was applied. Average LOS (line of sight) displacement velocity maps were generated for different periods: 1993 - 1997, 1998 - 2000, 2004, 2005, 2007, 2009, and 2012 - 2014, revealing that the area corresponding to Cerro Prieto basin presented the important surface deformation (mainly subsidence) during the entire time of investigation. The changes in the surface deformation pattern and rate were identified. These changes have a good correlation in time with the changes of production in the Cerro Prieto geothermal field.

  11. Oxygen isotope exchange in rocks and minerals from the Cerro Prieto geothermal system: Indicators of temperature distribution and fluid flow

    Science.gov (United States)

    Williams, A. E.; Elders, W. A.

    1981-12-01

    Paleotemperatures different from the present thermal regime were studied by examining coexisting mineral systems which exchanged their oxygen with the geothermal brines at different rates. Oxygen isotopic compositions were measured in drill cuttings and core and core samples from more than 40 wells. Oxygen isotopic profiles of pore filling calcites in sandstones are a measure of the recent equilibrium temperature distribution. A three dimensional map was developed, showing the equilibrium temperatures in the geothermal field. A mass balance calculation was performed using measured 18O enrichment of the geothermal brine. This calculation implies an overall water; rock volume ratio of approximately 3:1 during the history of the Cerro Prieto system.

  12. Production induced boiling and cold water entry in the Cerro Prieto geothermal reservoir indicated by chemical and physical measurements

    Science.gov (United States)

    Grant, M.A.; Truesdell, A.H.; Manon, M.A.

    1984-01-01

    Chemical and physical data suggest that the relatively shallow, western part of the Cerro Prieto reservoir is bounded below by low permeability rocks, and above and at the sides by an interface with cooler water. There is no continuous permeability barrier around or immediately above the reservoir. Permeability within the reservoir is dominantly intergranular. Mixture with cooler water rather than boiling is the dominant cooling process in the natural state, and production causes displacement of hot water by cooler water, not by vapour. Local boiling occurs near most wells in response to pressure decreases, but no general vapour zone has formed. ?? 1984.

  13. Arterial oxygen saturation in healthy newborns delivered at term in Cerro de Pasco (4340 m) and Lima (150 m)

    OpenAIRE

    Gonzales Gustavo F; Salirrosas Amelia

    2005-01-01

    Abstract Background High altitude is associated with both low pulse oxygen saturation at birth and more pre-term deliveries. The present study was performed to determine pulse oxygen saturation in newborns at term in Cerro de Pasco (4340 m) and Lima (150 m) to test the hypothesis that low pulse oxygen saturation at birth at high altitudes was not observed at term deliveries. Methods The present study was designed to determine pulse oxygen saturation values through 1 minute to 24 hours and val...

  14. Production induced boiling and cold water entry in the Cerro Prieto geothermal reservoir indicated by chemical and physical measurements

    Energy Technology Data Exchange (ETDEWEB)

    Grant, M.A. (DSIR, Wellington, New Zealand); Truesdell, A.H.; Manon, A.

    1981-01-01

    Chemical and physical data suggest that the relatively shallow western part of the Cerro Prieto reservoir is bounded below by low permeability rocks, and above and at the sides by an interface with cooler water. There is no continuous permeability barrier around or immediately above the reservoir. Permeability within the reservoir is dominantly intergranular. Mixture with cooler water rather than boiling is the dominant cooling process in the natural state, and production causes displacement of hot water by cooler water, not by vapor. Local boiling occurs near most wells in response to pressure decreases, but no general vapor zone has formed.

  15. Fault Length Vs Fault Displacement Evaluation In The Case Of Cerro Prieto Pull-Apart Basin (Baja California, Mexico) Subsidence

    Science.gov (United States)

    Glowacka, E.; Sarychikhina, O.; Nava Pichardo, F. A.; Farfan, F.; Garcia Arthur, M. A.; Orozco, L.; Brassea, J.

    2013-05-01

    The Cerro Prieto pull-apart basin is located in the southern part of San Andreas Fault system, and is characterized by high seismicity, recent volcanism, tectonic deformation and hydrothermal activity (Lomnitz et al, 1970; Elders et al., 1984; Suárez-Vidal et al., 2008). Since the Cerro Prieto geothermal field production started, in 1973, significant subsidence increase was observed (Glowacka and Nava, 1996, Glowacka et al., 1999), and a relation between fluid extraction rate and subsidence rate has been suggested (op. cit.). Analysis of existing deformation data (Glowacka et al., 1999, 2005, Sarychikhina 2011) points to the fact that, although the extraction changes influence the subsidence rate, the tectonic faults control the spatial extent of the observed subsidence. Tectonic faults act as water barriers in the direction perpendicular to the fault, and/or separate regions with different compaction, and as effect the significant part of the subsidence is released as vertical displacement on the ground surface along fault rupture. These faults ruptures cause damages to roads and irrigation canals and water leakage. Since 1996, a network of geotechnical instruments has operated in the Mexicali Valley, for continuous recording of deformation phenomena. To date, the network (REDECVAM: Mexicali Valley Crustal Strain Measurement Array) includes two crackmeters and eight tiltmeters installed on, or very close to, the main faults; all instruments have sampling intervals in the 1 to 20 minutes range. Additionally, there are benchmarks for measuring vertical fault displacements for which readings are recorded every 3 months. Since the crackmeter measures vertical displacement on the fault at one place only, the question appears: can we use the crackmeter data to evaluate how long is the lenth of the fractured fault, and how quickly it grows, so we can know where we can expect fractures in the canals or roads? We used the Wells and Coppersmith (1994) relations between

  16. Geología de la región del Cerro Guanaquero, Río Diamante, Mendoza

    OpenAIRE

    Federico Fuentes; Ramos,Victor A.

    2008-01-01

    El estudio realizado presenta nuevos datos sobre un sector poco conocido de la Cordillera Principal de Mendoza, en la alta cuenca del río Diamante en las adyacencias del cerro Guanaquero, y los primeros datos geocronológicos de sus rocas volcánicas. Las unidades geológicas presentes en el área se dividen en cuatro grupos principales: secuencias sedimentarias mesozoicas marinas y continentales intensamente plegadas y falladas; intrusivos y volcanitas intermedias de edad neógena; rocas volcánic...

  17. From bola-amphiphiles to supra-amphiphiles: the transformation from two-dimensional nanosheets into one-dimensional nanofibers with tunable-packing fashion of n-type chromophores.

    Science.gov (United States)

    Liu, Kai; Yao, Yuxing; Wang, Chao; Liu, Yu; Li, Zhibo; Zhang, Xi

    2012-07-09

    With a rational design of the supra-amphiphiles, we have successfully demonstrated that not only the dimension of the self-assembled nanostructures, but also the packing fashion of the functional naphthalene diimide (a typical n-type chromophore), can be tuned in a noncovalent way in aqueous solution. Naphthalene diimide is incorporated into a bola-amphiphile as the rigid core, whereas viologen derivatives are used as the hydrophilic head. The bola-amphiphile self-assembles into two-dimensional nanosheets, in which naphthalene diimide adopts a "J-type" aggregation. Water-soluble supramolecular complexation between viologen derivatives and the 8-hydroxypyrene-1, 3, 6-trisulfonic acid trisodium salt is used as a driving force for the formation of the supra-amphiphiles. Upon formation of the supra-amphiphiles, the nanosheets transform into ultralong nanofibers with a close packing of naphthalene diimide. Notably, just by mixing the two building blocks of the supra-amphiphiles in aqueous solution, a dimension-controlled evolution of the nanostructures is formed that leads to a different packing fashion of the n-type functional chromophores, which is facile and environmental friendly.

  18. Apocalipsis y literatura en Cien años de soledad de Gabriel García Márquez, La guerra del fin del mundo de Mario Vargas Llosa y Estrella distante de Roberto Bolaño

    Directory of Open Access Journals (Sweden)

    Laura Luche

    2013-07-01

    Full Text Available The study examines three novels of apocalyptic character, Cien años de soledad by Gabriel García Márquez, La guerra del fin del mundo by Mario Vargas Llosa and Estrella distante by Roberto Bolaño. Both in Cien años de soledad and in La guerra del fin del mundo apocalypse is related to the sudden and forced graft of modernity in a backward society and to the inability of the ruling class to understand the disturbing and devastating aspects of such a graft and, more generally, to understand themselves, their own development, their own history. Through the metaliterary component that characterizes them, Garcia Marquez’s and Vargas Llosa’ novels represent literature as an instrument that as memory, as a form of processing and understanding of history, can help to prevent the repetition of the apocalypse they narrate. In Bolaño’s novel, on the contrary, writers seem not to have any cognitive power anymore and their literature not only doesn’t play any salvific role, but rather becomes one of the elements that contributes to the historical catastrophe.

  19. O status da partida e a amplitude de circulação da bola da seleção espanhola de futebol na Copa do Mundo Fifa® 2010

    Directory of Open Access Journals (Sweden)

    Rodrigo Santos

    Full Text Available Resumo Este artigo objetiva comparar a amplitude de circulação da bola da seleção espanhola de futebol na Copa do Mundo Fifa® 2010, pelo número de variações de corredor (NVC em diferentes status das partidas. A amostra englobou 850 sequências ofensivas dos sete jogos da equipe na competição. Para coleta de dados, usou-se a observação de partidas televisionadas. Os dados foram registrados no Excel 2007. Fez-se análise descritiva para NVC. O teste de Kolmogorov-Smirnov foi usado para verificar a distribuição dos dados. Usou-se o teste de Kruskal-Wallis (p < 0,05 para comparar o NVC entre os status das partidas. Não houve diferença significativa de NVC nos status das partidas (p = 0,328. Conclui-se que o status da partida não influenciou a amplitude de circulação da bola da Espanha.

  20. Magnitud y tendencia del suicidio en las provincias de Costa Rica: 1980 - 1994

    OpenAIRE

    Damaris Granados Bloise

    1998-01-01

    En el primer artículo de la serie, publicado en el número anterior de esta Revista (1), se analizó, para Costa Rica como un todo, la magnitud, estructura por edad y sexo y tendencia del suicidio en el período 1980 - 1994. En esta segunda entrega se amplía el estudio a nivel de provincia. (2) (3) (4) (5) de las 2.015 muertes por suicidio registradas entre 1980 - 1994, el 39% correspondió a residentes de la provincia de San José, el 17% de Alajuela y el 11% de Limón. La más alta tasa promedio a...

  1. Relevamiento preliminar de las TICs en establecimientos de una localidad de la provincia de Corrientes

    OpenAIRE

    Mariño, Sonia Itatí; Godoy Guglielmone, María Viviana

    2006-01-01

    Con el objeto de definir acciones tendientes a disminuir la brecha digital existente en distintas regiones del pais y de la provincia de Corrientes, es necesario implementar relevamientos de datos de modo de diseñar programas de formación y capacitación en las TICs acordes a la zona de ejecución. Se exponen los resultados obtenidos de la implementación de un relevamiento en el año 2005.

  2. Stenocercus doellojuradoi (Iguanidae, Tropidurinae: una nueva especie para la provincia de San Juan, Argentina

    Directory of Open Access Journals (Sweden)

    Laspiur, Alejandro

    2006-05-01

    Full Text Available República Argentina, Provincia de San Juan, Depto. Valle Fértil, 3 km al norte de la localidad de Las Tumanas sobre la Ruta Provincial 510 (30°52’ S, 67°20’ W. COLECTOR: Alejandro Laspiur. FECHA: 25 /02/ 2006. MATERIAL DE REFERENCIA: Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan: IMCNUNSJ 3000. Un ejemplar macho (LHC: 54 mm..

  3. Caracterización sismológica de la provincia de Matanzas.

    Directory of Open Access Journals (Sweden)

    Laritza Alfonso González

    2013-01-01

    Full Text Available En la investigación presentada se exponen conceptos fundamentales y un estado del arte acerca de los estudios de riesgos, para ello se abordará el tema específicamente en la provincia de Matanzas. Muchos son los estudios de riesgos que se pueden llevar a cabo ante innumerables peligros, en este caso la autora inclina su investigación a los riesgos por desastres naturales y específicamente (los sismos. En la investigación la autora hace una recopilación de la información geológica - tectónica - sismológica de la provincia y se propone un valor de aceleración sísmica para conocer mediante un grupo de estudios la vulnerabilidad de algunas edificaciones ya existente o también llevar a cabo proyectos sismo – resistentes. Para la realización de esta investigación la autora se ve motivada por la necesidad de conocer, profundizar acerca de este tema porque el hecho de que la provincia se encuentre ubicada en una región que por las características de su suelo no tiene como tarea imprescindible adoptar medidas sismo- resistentes no minimiza el que estos fenómenos existan y se debe estar preparado para enfrentarlos, razones claras para tomar de suma importancia estos estudios de vulnerabilidad sísmica que se proponen realizar en la provincia.

  4. Changes in steam production due to the reservoir conditions in Cerro Prieto, Baja California; Cambios en la produccion de vapor debido a las condiciones del yacimiento en Cerro Prieto, Baja California

    Energy Technology Data Exchange (ETDEWEB)

    Morales Cardenas, Ramon; Rodriguez Rodriguez, Marco H. [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Residencia General de Cerro Prieto, Mexicali, B.C. (Mexico)]. E-mail: marco.rodriguez01@gfe.gob.mx

    2011-07-15

    In more than 35 years of exploitation, thermodynamic conditions have changed in the Cerro Prieto geothermal reservoir. The effects are analyzed of the changes to the reservoir and their consequences to steam production in different field zones. For steam production, the most important features of reservoir fluids are enthalpies and pressures. The evolution of these features is presented in an enthalpy-pressure diagram. Here it can be seen that some reservoir zones have almost reached abandonment conditions. [Spanish] En mas de 35 anos de explotacion el yacimiento geotermico de Cerro Prieto ha experimentado cambios en sus condiciones termodinamicas. En este trabajo se analiza el efecto de esos cambios del yacimiento y su repercusion en la produccion de vapor para las diferentes zonas en las que se ha dividido el campo. Las propiedades mas importantes del fluido en el yacimiento para la produccion de vapor son su entalpia y su presion, por lo que se presenta la evolucion de esas propiedades en un diagrama de presion-entalpia, en el que se observa que hay zonas del yacimiento que estan proximas a alcanzar condiciones de abandono.

  5. Mexican-American Cooperative Program at the Cerro Prieto geothermal field: Analysis of the Nuevo Leon magnetic anomaly and its possible relation to the Cerro Prieto magmatic-hydrothermal system

    Science.gov (United States)

    Goldstein, N. E.; Wilt, M. J.; Corrigan, D. J.

    1982-10-01

    The broad dipolar magnetic anomaly whose positive peak is centered near Ejido Nuevo Leon, some 5 km east of the Cerro Prieto I Power Plant, has long been suspended to have a genetic relationship to the thermal source of the Cerro Prieto geothermal system. This suspicion was reinforced after several deep geothermal wells, drilled to depths of 3 to 3.5 km over the anomaly, intersected an apparent dike-sill complex consisting mainly of diabase but with minor rhyodacite. A detailed fit of the observed magnetic field to a computer model indicates that the source may be approximated by a tabular block 4 by 6 km in area, 3.7 km in depth, 2.3 km thick, and dipping slightly to the north. Mafic dike chips from one well, NL-1, were analyzed by means of electron microprobe analyses which showed them to contain a titanomagnetite that is paramagnetic at in-situ temperature conditions. As the dike mineralogy does not account for the magnetic anomaly, the magnetic source is believed to be a deeper, magnetite-rich assemblage of periodotite-gabbro plutons.

  6. Emisión de gases de efecto invernadero en la provincia de Matanzas

    Directory of Open Access Journals (Sweden)

    Mercedes Alemán García

    2008-01-01

    Full Text Available Se realiza un diagnóstico de la Emisión y Absorción de los Gases de Efecto Invernadero (GEI en la Provincia de Matanzas sobre la base de un inventario detallado con los datos de los años 2005 y 2006. Este inventario es la actualización del primero realizado en la provincia con datos del año 2002. Se emplea la metodología recomendada en las Guías Revisadas de 1996 del Panel Intergubernamental sobre Cambio Climático (IPCC [8] y para los cálculos se utilizó el Software del Libro de Trabajo del Inventario de Gases de Efecto Invernadero [9]. La información utilizada se obtiene de las instituciones y empresas provinciales y se utilizan básicamente los factores de emisión proporcionados por las Guías del IPCC y los utilizados por los Inventarios Nacionales realizados para los años 1990, 1994 y 1996 [10]. A partir de la identificación de las principales fuentes emisoras y receptoras de GEI en la Provincia, se comparan las variaciones existentes entre estos dos años y el año 2002.

  7. Mapas en escenarios de cambio: el caso de la provincia de Río Negro, Argentina

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    Paula Gabriela Núñez

    2015-01-01

    Full Text Available En este trabajo se analiza la forma en que se fue graficando la provincia de Río Negro en Argentina,desde su formación en 1958 hasta el golpe de Estado de 1976. Se contextualizan los esquemasterritoriales y mapas de la provincia en los modos precedentes de graficar el territorio patagónico,indagando en las diversas tensiones y dinámicas que incidieron en su formación como provincia,y las rupturas y continuidades presentes en el modo de caracterizar el espacio. Estos elementospermitirán evidenciar el carácter coyuntural de las representaciones gráficas del territorio.También muestran la pretensión de objetividad y neutralidad de los mismos, dando cuenta dela comprensión espacial como parte de una planificación política antes que de una observacióndirecta, que se observa en las diferentes formas de dibujar la superficie afectada a la jurisdicciónprovincial.Como resultado encontramos que los sucesivos gobiernos provinciales, entre 1958 y 1976, vana fundamentar una política distributiva desigual usando un discurso geográfico que justificó elestablecimiento de marginalidades internas.

  8. Stress orientation and anisotropy based on shear-wave splitting observations in the Cerro Prieto fault area, Baja California, Mexico

    Science.gov (United States)

    Zúñiga, F. R.; Castro, R. R.; Domínguez, T.

    1995-03-01

    Digital seismograms continuously recorded from 1988 to 1992 by two stations of the RESNOM seismic network in northern Baja California, Mexico, were used to search for probable shear-wave anisotropic characteristics in the region of the Cerro Prieto fault. Shear-wave splitting was identified in many of the three-component records analyzed. We measured the polarization direction of the leading S wave inside the S-wave window as well as the delay times between fast and slow phases on those records displaying shear-wave splitting. For station CPX, which is nearest the Imperial Valley region to the north, the preferred polarization direction found in this study (azimuth 180°±10°) coincides with the direction of the regional maximum compressive stress determined for the region. This polarization direction can be interpreted in terms of the “Extensive Dilatancy Anisotropy” model as the effect of vertical parallel aligned cracks. The preferred polarization direction measured at LMX, however, gives an azimuth of 45°±5°. Thus, it appears that faults and fractures aligned oblique to the main tectonic trend have a greater influence on the anisotropic characteristics of the crust south of Cerro Prieto volcano than that of the regional stress field. Time delays between slow and fast S waves observed at CPX appear constant from 1988 to 1992 while delays measured at LMX for the same interval indicate a small increase with time which cannot be attributed to azimuthal variations of paths.

  9. ANALYSIS OF MUNICIPAL WASTEWATER AND ACID MINE DRAINAGE PASSIVE CO-TREATMENT AT CERRO RICO DE POTOSÍ, BOLIVIA

    Directory of Open Access Journals (Sweden)

    William H.J. Strosnider

    2015-06-01

    Full Text Available Acid mine drainage (AMD is a worldwide environmental problem. The passive co-treatment of AMD with municipal waste water (MWW is a cost effective approach that uses nutrients in MWW in order to treat high concentrations of metals and sulfate found in AMD. Cerro Rico de Potosí in Bolivia is one of the biggest mining cities in the world, and it is constantly facing problems with AMD. The goal of this study was to determine the reaction rates of Al, Fe, Mn, Zn, and other metals found in an AMD discharge from Cerro Rico by a three-stage reactor system. The AMD had a pH of 3.58 and acidity of 1080 mg/L as CaCO3 equivalent containing 12, 68, 17 and 550 mg/L of dissolved Al, Fe, Mn, and Zn respectively. The reaction rates of Al, Fe, Mn, and Zn were 1.43, 2.09, 0.01, and 0.10 d-1, respectively.

  10. Importaciones áticas del siglo V a.C. del Cerro del Prado (Algeciras, Cádiz

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    Cabrera, Paloma

    1996-12-01

    Full Text Available In this paper we analyze a group of Attic imports, found in the excavations of Cerro del Prado, a settlement situated in the Bahía de Algeciras (Cádiz. The great interest of this group lies in the fact that it belongs to a particular chronological period, the last third of the 5th century B.C., as we have not found later imports, and in the almost exclusive presence of black glazed vases, which gives US an idea of a very definitive demand of the punic society of the Iberian Peninsula regarding the trade of greek goods.

    Presentamos en este trabajo un conjunto de importaciones áticas halladas en las excavaciones del Cerro del Prado, situado en la bahía de Algeciras (Cádiz. El interés de este conjunto reside en su pertenencia a un momento cronológico muy concreto: el último tercio del siglo V a.C., no habiéndose hallado importaciones más modernas y en la presencia absoluta de vasos de barniz negro, lo que nos habla de una demanda muy determinada de la sociedad púnica peninsular frente al comercio de productos griegos.

  11. Gases in steam from Cerro Prieto geothermal wells with a discussion of steam/gas ratio measurements

    Science.gov (United States)

    Nehring, N.L.; Fausto, L.J.J.

    1979-01-01

    As part of a joint USGS-CFE geochemical study of Cerro Prieto, steam samples were collected for gas analyses in April, 1977. Analyses of the major gas components of the steam were made by wet chemistry (for H2O,CO2,H2S and NH3) and by gas chromatography (He,H2,Ar,O2,N2 and hydrocarbons). The hydrocarbon gases in Cerro Prieto steam closely resemble hydrocarbons in steam from Larderello, Italy and The Geysers, California which, although they are vapor-dominated rather than hot-water geothermal systems, also have sedimentary aquifer rocks. These sedimentary geothermal hydrocarbons are characterized by the presence of branched C4-6 compounds and a lack of unsaturated compounds other than benzene. Relatively large amounts of benzene may be characteristic of high-temperature geothermal systems. All hydrocarbons in these gases other than methane most probably originate from the thermal metamorphosis of organic matter contained in the sediments. ?? 1979.

  12. Paleomagnetism in the Determination of the Emplacement Temperature of Cerro Colorado Tuff Cone, El Pinacate Volcanic Field, Sonora, Mexico.

    Science.gov (United States)

    Rodriguez Trejo, A.; Alva-Valdivia, L. M.; Vidal Solano, J. R.; Garcia Amador, B.; Gonzalez-Rangel, J. A.

    2014-12-01

    Cerro Colorado Maar is located at the World Heritage Site, biosphere reserve El Pinacate and Gran Desierto del Altar, at the NNW region of Sonora, Mexico (in El Pinacate Volcanic Field). It is a tuff cone, about 1 km diameter, result of several phreatomagmatic episodes during the late Quaternary. We report paleomagnetic and rock magnetic properties from fusiform volcanic bombs obtained from the borders of Cerro Colorado. This study is based in the thermoremanent magnetization TRM normally acquired by volcanic rocks, which can be used to estimate the emplacement temperature range. We performed the experiments on 20 lithic fragments (10 cm to 20 cm approximately), taking 6-8 paleomagnetic cores from each. Rock magnetic experiments (magnetic susceptibility vs. temperature (k-T), hysteresis curves and FORC analysis, shows that the main magnetic mineral carriers of magnetization are titanomagnetite and titanohematite in different levels of intergrowth. The k-T curves suggest in many cases, only one magnetic phase, but also in other cases a second magnetic phase. Thermal demagnetization was used to demagnetize the specimens in detailed short steps and make a well-defined emplacement temperature determination ranges. We found that temperature emplacement determination range for these two magnetic phases is between 350-450 °C, and 550-580 °C, respectively. These results are consistent with those expected in an eruption of Surtsey type, showing a distinct volcanic activity compared to the other craters from El Pinacate volcanic field.

  13. Análisis del Impuesto sobre los Ingresos Brutos en las Provincias del Noroeste Argentino.

    Directory of Open Access Journals (Sweden)

    Juan Manuel Fernández

    2004-05-01

    Full Text Available Las fluctuaciones y los cambios estructurales económicos representan conceptos claves para el análisis de datos de coyuntura. Constituyen la materia prima para la estimación y predicción de variables representativas de la actividad económica de un país. Los cambios estructurales son acontecimientos especialmente relevantes en el análisis de la coyuntura económica que se examinan con especial atención, sobre todo por sus implicancias. Las fluctuaciones amplían sustancialmente el conocimiento sobre el sistema económico, de modo que pueden explicar con mayor fundamento el comportamiento de las variables analizadas y obtener predicciones y diagnósticos más precisos. En base a los datos obtenidos de la Dirección Nacional de Coordinación Fiscal con las Provincias, dependiente del Ministerio del Interior de la Nación, se realiza un análisis descriptivo del comportamiento de la recaudación del impuesto sobre los Ingresos Brutos de las provincias de la región del Noroeste Argentino -Catamarca, Jujuy, Salta, Santiago del Estero y Tucumán- en el período comprendido entre 1983 y 2002. También se ha considerado importante agregar la relación entre la recaudación del tributo y el Producto Bruto Interno (PBI, en cada una de las provincias, a efectos de medir su incidencia y disponer de un coeficiente de comparación interjurisdiccional de eficiencia tributaria por parte de la entidad recaudadora. Finalmente y en función de la disponibilidad de datos mensuales de la recaudación de la Provincia de Tucumán, se realiza un análisis de la serie correspondiente al tributo Ingresos Brutos, en el período enero de 1987 a junio de 2003, muy representativo para medir el nivel de actividad económica de nuestra provincia. El método estadístico, para esta parte del trabajo, se basa en un análisis de series cronológicas con enfoque estructural de espacio de estado.

  14. A process for fire-related debris flow initiation, Cerro Grande fire, New Mexico

    Science.gov (United States)

    Cannon, S.H.; Bigio, E.R.; Mine, E.

    2001-01-01

    In this study we examine factors that pertain to the generation of debris flows from a basin recently burned by wildfire. Throughout the summer 2000 thunderstorm season, we monitored rain gauges, channel cross-sections, hillslope transects, and nine sediment-runoff traps deployed in a steep, 0??15 km2 basin burned by the May 2000 Cerro Grande fire in New Mexico. Debris flows were triggered in the monitored basin during a rainstorm on July 16, 2000, in response to a maximum 30 min rainfall intensity of 31 mm h-1 (return period of approximately 2 years). Eleven other storms occurred before and after the July storm; these storms resulted in significant runoff, but did not generate debris flows. The debris flows generated by the July 16 storm initiated on a broad, open hillslope as levee-lined rills. The levees were composed of gravel- and cobble-sized material supported by an abundant fine-grained matrix. Debris-flow deposits were observed only on the hillslopes and in the first and second-order drainages of the monitored basin. No significant amounts of channel incision were measured following the passage of the debris flows, indicating that most of the material in the flows originated from the hillslopes. Sediment-runoff concentrations of between 0??23 and 0??81 kg 1-1 (with a mean of 0-42 kg 1-1) were measured from the hillslope traps following the debris-flow-producing storm. These concentrations, however, were not unique to the July 16 storm. The materials entrained by the July 16 storm contained a higher proportion of silt- plus clay-sized materials in the debris flows. The difference in materials demonstrates the critical role of the availability of fine-grained wood ash mantling the hillslopes in the runoff-dominated generation of post-wildfire debris flows. The highest sediment-runoff concentrations, again not unique to debris-flow production, were produced from maximum 30 min rainfall intensities greater than 20 mm h-1. Copyright ?? 2001 John Wiley and Sons

  15. El megadeslizamiento del cerro Uritorco, ladera occidental de la Sierra chica de Córdoba

    Directory of Open Access Journals (Sweden)

    Claudio A Carignano

    2014-03-01

    Full Text Available En el extremo norte de la Sierra Chica de Córdoba, sobre el flanco oeste del cerro Uritorco (1.949 m s.n.m., se ha identificado un megadeslizamiento (30°49'55,46"S y 64°29'50,31"O. Los materiales movilizados del frente del escarpe de la falla Sierra Chica, han cubierto parcialmente el granito de Capilla del Monte y los abanicos aluviales pleistocenos del piedemonte. El lóbulo y bloques rotados del deslizamiento conforman un alto topográfico que oficia de límite entre los valles de Punilla (al sur y de Charbonier (al noroeste. Mediante técnicas de procesamiento e interpretación de imágenes satelitales multiespectrales de media (Landsat-ETM y muy alta resolución (GeoEye-1, análisis digital del terreno a partir de modelos de elevación (SRTM y Aster-GDEM y el correspondiente control de campo, se ha delimitado y caracterizado esta megageoforma nunca antes advertida. Dada la elevada sismicidad actual e histórica de la zona y los indicios morfotectónicos que señalan como activas a las fallas Sierra Chica y Pajarillo-Copacabana-Masa, se estima que este deslizamiento posiblemente fue gatillado por un evento sísmico, acontecido en alguna de esas estructuras. Tanto el depósito del deslizamiento como su cicatriz de despegue presentan un significativo grado de erosión hídrica. Por análisis comparativos con otros deslizamientos ya datados y de características similares, situados en el escarpe occidental de las Sierras de San Luis, se le asigna una edad pleistocena medio-tardía. Por su volumen y características (2,1 x109 m³ se estableció que se trata de un megadeslizamiento único en las Sierras de Córdoba y constituye uno de los deslizamientos de mayor tamaño entre los registrados hasta el presente en Argentina.

  16. El sistema de yacimientos de mamíferos miocenos del Cerro de los Batallones, Cuenca de Madrid: estado actual y perspectivas

    NARCIS (Netherlands)

    Morales, J.; Pozo, M.; Silva, P.G.; Domingo, M.S.; López-Antoñanzas, R.; Álvarez Sierra, A.; Antón, M.; Martín Escorza, C.; Quiralte, V.; Salesa, M.J.; Sánchez, I.M.; Azanza, B.; Calvo, J.P.; Carrasco, P.; García-Paredes, I.; Knoll, F.; Hernández Fernández, M.; Hoek Ostende, van den L.W.; Merino, L.; Meulen, van der A.J.; Montoya, P.; Peigné, S.; Peláez-Campomanes, P.; Sánchez-Marco, A.; Turner, A.; Abella, J.; Alcalde, G.M.; Andrés, M.; DeMiguel, D.; Cantalapiedra, J.L.; Fraile, S.; García Yelo, B.A.; Gómez Cano, A.R.; López Guerrero, P.; Oliver Pérez, A.; Siliceo, G.

    2008-01-01

    The Cerro de los Batallones (Los Batallones Butte) is located in the central-northern area of the Madrid Basin, central Spain. Nine vertebrates localities containing a large variety of mammals of Upper Vallesian Age (Late Miocene) have been found associated with the sediments forming the butte. From

  17. El frente de corrimiento andino al nivel de los cerros Penitentes y Visera (alta Cordillera de Mendoza: aspectos cronológicos y cartográficos

    Directory of Open Access Journals (Sweden)

    Jean-Claude Vicente

    2009-10-01

    Full Text Available El hallazgo de una iportante fauna de invertebrados marinos del Tithoniano superior a espaldas del cerro Penitentes en la secuencia carbonática basal de la primera escama del frente de corrimiento andino, confirma la lógica tectónica de un despegue de esta unidad a nivel del Yeso Principal y lleva a invalidar ciertas correlaciones litoestratigráficas y bosquejos paleogeográficos asignados a la Formación La Manga. Por otro lado, el análisis de algunos perfiles claves en torno al cerro Penitentes entre la quebrada Vargas y el cerro Visera permite presentar una reinterpretación tectónica del sector. Esta se sustenta en el reconocimiento y la diferenciación de las unidades terciarias básicas representadas por los Conglomerados Penitentes (Mioceno inferior y los Aglomerados Santa María (Mioceno superior en una relación muy similar a la descrita anteriormente al norte de Puente del Inca. El estudio permite seguir las interferencias, en un contexto polifásico, entre las reactivaciones del corrimiento Penitentes de piel fina y un cabalgamiento frontal de piel gruesa que repite la secuencia terciaria. La discordancia entre las secuencias terciarias y el emplazamiento de una klippe de Malm sobre los Conglomerados Penitentes del sinclinal del cerro Visera, conduce a otorgar cierta importancia a la fase del final del Mioceno inferior.

  18. An integrated model for the natural flow regime in the Cerro Prieto hydrothermal system based upon petrological and isotope geochemical criteria

    Energy Technology Data Exchange (ETDEWEB)

    Elders, W.A.; Williams, A.E.; Hoagland, J..

    1981-01-01

    Studies of cuttings and cores at Cerro Prieto have now been extended to more than 50 boreholes. The aims of this petrological and isotopic work are to determine the shape of the reservoir, its physical properties, and its temperature distribution and flow regime before the steam field was produced.

  19. Paleomagnetism of the Quaternary Cerro Prieto, Crater Elegante, and Salton Buttes volcanic domes in the northern part of the Gulf of California rhombochasm

    Energy Technology Data Exchange (ETDEWEB)

    de Boer, J.

    1980-02-01

    Deviating thermomagnetic directions in volcanics representing the second and fifth or sixth pulse of volcanism suggest that the Cerro Prieto volcano originated about 110,000 years B.P. and continued to be active intermittently until about 10,000 years ago.

  20. Land subsidence in the Cerro Prieto Geothermal Field, Baja California, Mexico, from 1994 to 2005: An integrated analysis of DInSAR, leveling and geological data

    Science.gov (United States)

    Sarychikhina, Olga; Glowacka, Ewa; Mellors, Robert; Vidal, Francisco Suárez

    2011-07-01

    Cerro Prieto is the oldest and largest Mexican geothermal field in operation and has been producing electricity since 1973. The large amount of geothermal fluids extracted to supply steam to the power plants has resulted in considerable deformation in and around the field. The deformation includes land subsidence and related ground fissuring and faulting. These phenomena have produced severe damages to the local infrastructure such as roads, irrigation canals and other facilities. In this paper, the technique of Differential Synthetic Aperture Radar Interferometry (DInSAR) is applied using C-band ENVISAR ASAR data acquired between 2003 and 2006 to determine the extent and amount of land subsidence in the Mexicali Valley near Cerro Prieto Geothermal Field. The DInSAR results were compared with published data from precise leveling surveys (1994-1997 and 1997-2006) and detailed geological information in order to improve understanding of the temporal and spatial distributions of anthropogenic subsidence in the Mexicali Valley. The leveling and DInSAR data were modeled to characterize the observed deformation in terms of fluid extraction. The results confirm that the tectonic faults control the spatial extent of the observed subsidence. These faults likely act as groundwater flow barriers for aquifers and reservoirs. The shape of the subsiding area coincides with the Cerro Prieto pull-apart basin. In addition, the changes in spatial pattern and rate of the subsidence are correlated with the development of the Cerro Prieto Geothermal Field.

  1. Land subsidence in the Cerro Prieto Geothermal Field, 1 Baja California, Mexico, from 1994 to 2005. An integrated analysis of DInSAR, levelingand geological data.

    Energy Technology Data Exchange (ETDEWEB)

    Sarychikhina, O; Glowacka, E; Mellors, R; Vidal, F S

    2011-03-03

    Cerro Prieto is the oldest and largest Mexican geothermal field in operation and has been producing electricity since 1973. The large amount of geothermal fluids extracted to supply steam to the power plants has resulted in considerable deformation in and around the field. The deformation includes land subsidence and related ground fissuring and faulting. These phenomena have produced severe damages to infrastructure such as roads, irrigation canals and other facilities. In this paper, the technique of Differential Synthetic Aperture Radar Interferometry (DInSAR) is applied using C-band ENVISAR ASAR data acquired between 2003 and 2006 to determine the extent and amount of land subsidence in the Mexicali Valley near Cerro Prieto Geothermal Field. The DInSAR results were compared with published data from precise leveling surveys (1994- 1997 and 1997-2006) and detailed geological information in order to improve the understanding of temporal and spatial distributions of anthropogenic subsidence in the Mexicali Valley. The leveling and DInSAR data were modeled to characterize the observed deformation in terms of fluid extraction. The results confirm that the tectonic faults control the spatial extent of the observed subsidence. These faults likely act as groundwater flow barriers for aquifers and reservoirs. The shape of the subsiding area coincides with the Cerro Prieto pull-apart basin. In addition, the spatial pattern of the subsidence as well as changes in rate are highly correlated with the development of the Cerro Prieto Geothermal Field.

  2. Relación entre factores micro- estructurales e impacto repetido en aleaciones de alto cromo para bolas de molino. // Relationship among factors micro - structural and impact repeated in alloys of high chromium for mill balls.

    Directory of Open Access Journals (Sweden)

    E. Albertin

    2008-01-01

    Full Text Available Las aleaciones de alto cromo son empleadas para la fabricación de bolas de molino en industrias de procesamiento deminerales. Los usuarios y fabricantes requieren lograr mejores resultados técnicos-económicos en sus aplicaciones, por loque necesitan aumentar los conocimientos relacionados con los aspectos estructurales de estos materiales. En este trabajo serealiza una investigación con vistas a establecer relaciones entre la estructura de las aleaciones y su comportamiento ante elimpacto repetido que es un fenómeno característico en estos procesos.Se funden bolas con varias aleaciones hipo eutécticas, eutécticas, e hipereutécticas; se prueban en un equipo que simula elimpacto repetido. Los resultados permiten comprobar los buenos resultados de aleaciones hipo eutécticas con relaciones deCr/C altas y a su vez altos contenidos de Cr y de aleaciones eutécticas para menores relaciones de Cr/C y menorescontenidos de Cr, en ambos casos los carburos eutécticos son de forma simétrica, regulares y no forman redes continuas decarburos asimétricos bordeando los granos, que presentan peores comportamiento en el impacto repetido y que son el casode las hipoeutécticas con bajas relaciones Cr/C y las hipereutécticas donde aparecen también grandes carburos primariosPalabras claves: Alto-cromo, bolas de molino, impacto repetido, desgaste.____________________________________________________________________________Abstract.High Chromium alloys are used to manufacture grinding balls for the Industry of Construction Materials. Customers andusers need to improve their knowledge about the relationships between microstructure and the parts damage in these alloysto obtain better technical-economics results. In this paper the results of a research to obtain different microstructures ofeutectics, hipoeutectics and hipereutectics alloys are presented, searching for the lesser damage in these alloys. These alloysare tested in a repeated impact testing

  3. Redescripción de la obrera de Myrmelachista gallicola (Hymenoptera: Formicidae y primera cita para la provincia de La Pampa (Argentina

    Directory of Open Access Journals (Sweden)

    Estela M. QUIRÁN

    2006-01-01

    Full Text Available Se redescribe la obrera de Myrmelachista gallicola Mayr y se cita por primera vez para la provincia de La Pampa (Argentina. El material estudiado está compuesto por obreras y fue recolectado sobre Prosopis caldenia Burkart (Fabaceae, dentro de las agallas de Tetradiplosis sp. (Diptera: Cecidomyiidae, en la periferia de la ciudad de Santa Rosa, provincia de La Pampa.

  4. 三江黄牛Bola-DRB3基因第二外显子的PCR-RFLP多态性研究%Study on the polymorphism of the Bola-DRB3 gene exon 2 in the Sanjiang Cattle by PCR-RFLP Method

    Institute of Scientific and Technical Information of China (English)

    陈智华; 顾磊; 钟金城; 陈雪梅

    2007-01-01

    用PCR-RFLP方法,对三江黄牛和黑白花奶牛的MHCⅡ类基因座位Bola-DRB3基因第2外显子的遗传样性进行了研究. 结果表明:①三江黄牛HaeIII酶切出现3种基因型,即SS、RS、RR,由S和R两个基因控制,RR为优势基因型,R为优势基因;RsaI酶切出现4种基因型,即XX、XM、LM、MM,由X、M和L三个复等位基因控制,LM为优势基因型,M为优势基因;两种内切酶在三江黄牛Bola-DRB3基因的第二个外显子上有150、202、65、180等酶切位点,且4个位点的碱基存在多态性,表现为多碱基突变;经(2适合性检验,HaeIII和RsaI酶切位点的(2值分别为7.0802、14.1358,差异显著(p<0.05),说明三江黄牛Bola-DRB3基因第2外显子的4个酶切位点的碱基突变未达到Hardy-Weinberg平衡状态,存在选择、基因突变、近交、遗传漂变等因素的影响. ②黑白花奶牛HaeIII酶切出现4种基因型,即JJ、KI、IJ、KJ,由J、K和I三个复等位基因控制,JJ为优势基因型,J为优势基因;RsaI酶切出现3种基因型,即LL、MM、LM,由L和M两个基因控制,LM为优势基因型,M为优势基因;HaeIII和RsaI两种内切酶在黑白花奶牛中也有多个酶切位点,在150、48、65、202位上有碱基多态性,表现为多碱基突变;经(2适合性检验,RsaI酶切位点的(2值为3.456,差异不显著(p>0.05),处于Hardy-Weinberg平衡状态;HaeIII酶切位点的(2值为18.4211,差异显著(p<0.05),未达到Hardy-Weinberg平衡状态. ③用两种酶在三江黄牛中共检测到7种基因型,且与黑白花奶牛在酶切位点上具有较多的差异,说明三江黄牛具有丰富的遗传多样性;这一结果与张成忠、赖松家等从血液蛋白、染色体、mtDNA等水平上的研究结果一致,也同三江黄牛的育成历史和所处生态条件一致. 综上所述,三江黄牛具有丰富的遗传多样性,今后应加强对三江黄牛遗传多态性以及起源、演化和分类的研究,为这一畜种资源的进一步开

  5. Hydraulic model of the steam-lines network of the Cerro Prieto, B.C., geothermal field; Modelo hidraulico de la red de vaporductos del campo geotermico de Cerro Prieto, B.C.

    Energy Technology Data Exchange (ETDEWEB)

    Salaices, E; Garcia, A; Martinez J I; Ovando, R; Cecenas, M; Hernandez A F [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: salaices@iie.org.mx; Canchola, I; Mora, O; Miranda, C; Herandez, M; Lopez, S; Murillo, I [Comision Federal de Electricidad, B.C (Mexico)

    2007-01-15

    The steam-line network of the Cerro Prieto geothermal field is composed of 184 wells, and 162 of the wells are integrated and connected by pipes. Thirteen power units, with an installed electrical capacity of 720 MW, are fed by that network. The network length is 120 km, including pipes of several diameters with branches and interconnections. The extension and complexity of the steam-line system make it difficult to analyze the transport and supply of steam to the power plants. For that it was necessary to have a tool capable of analyzing the system and the performance of the network as a whole, as well as the direction and flow volumes in each part of the system. In this paper, a hydraulic model of the Cerro Prieto steam-line network is presented. The model can determine the performance of the whole network by quantifying the pressure drops, flows and heat losses of the components. The model analyses the consequences of changes in operating conditions, steam production, maintenance activities and design (such as the integration of new wells). The model was developed using PIPEPHASE 9.0, a numeric simulator of multi-phase flow in steady state with heat transfer. It is used to model systems and pipe networks for steam- and condensate-transport. [Spanish] La red de vaporductos del campo geotermico de Cerro Prieto esta compuesta por un conjunto de 184 pozos, de los cuales 162 son pozos integrados, interconectados entre si a traves de una red de tuberias. Por medio de esta red se alimentan 13 unidades generadoras de electricidad con una capacidad total instalada de 720 MWe. La red tiene una longitud aproximada de 120 kilometros y esta compuesta por tuberias de diferentes diametros, ramales, interconexiones, etc. La complejidad y extension del sistema de vaporductos hace muy dificil el analisis del transporte y suministro de vapor a las plantas generadoras. Lo anterior creo la necesidad de contar con una herramienta que ayudara en el analisis del sistema con el fin de

  6. Las asignaciones para el culto en el presupuesto de la provincia de Tucumán, Argentina (1852-1897

    Directory of Open Access Journals (Sweden)

    Esteban Abalo

    2014-01-01

    Full Text Available El presente trabajo tiene como finalidad analizar los montos destinados por el estado provincial de Tucumán, Argentina, al ítem de Culto, dentro del presupuesto de la provincia entre los años 1852 y 1897. Durante este período fueron constantes los aportes del gobierno para contribuir a los gastos originados por el ejercicio del culto católico en la provincia. El trabajo apunta a enmarcar estos aportes dentro de los estudios sobre la reconstrucción de la Iglesia Católica y sobre la edificación del aparato administrativo estatal en la provincia durante la segunda mitad del siglo xix.

  7. Cost model for geothermal wells applied to the Cerro Prieto geothermal field case, BC Abstract; Modelo de costeo de pozos geotermicos aplicado para el caso del campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Vaca Serrano, Jaime M.E [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Morelia, Michoacan (Mexico)]. E-mail: jaime.vaca@cfe.gob.mx

    2008-01-15

    A project for drilling geothermal wells to produce electrical energy can be defined as a sequence of plans to get steam or geothermal fluids to satisfy a previously known demand, and, under the best possible conditions, to obtain payment. This paper presents a cost model for nine wells drilled at the Cerro Prieto geothermal field in 2005 and 2006 to supply steam to the power plants operating in the field. The cost model is based on the well cost, the initial steam production, the annual decline of steam, the drilling schedule and the break-even point for each well. The model shows the cost of steam by the ton and the sale price needed to determine the discount rate and the investment return time. [Spanish] Un proyecto de perforacion de pozos geotermicos puede definirse como una secuencia o sucesion de planes para obtener vapor o fluidos geotermicos destinados a satisfacer una demanda previamente determinada, que se emplearan principalmente para generar energia electrica, bajo las mejores condiciones para obtener un pago. Este trabajo presenta un modelo de costeo para nueve pozos en el campo geotermico de Cerro Prieto, que fueron perforados entre 2005 y 2006 como parte del suministro de vapor para las plantas generadoras que operan en este campo. El modelo de costeo se basa en el costo por pozo, la produccion inicial de vapor, la declinacion anual de vapor, los intereses de las obras de perforacion y el punto de equilibrio para cada pozo. Los resultados permiten conocer el costo de la tonelada de vapor y el precio de venta para determinar la tasa de descuento y el tiempo de retorno de la inversion.

  8. Noise reduction in steam-vent points at the Cerro Prieto geothermal field, BC; Reduccion del ruido en puntos de desfogue en el campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Miranda Herrera, Carlos A [Comision Federal de Electricidad, Residencia General de Cerro Prieto, Mexicali, B.C (Mexico)]. E-mail: carlos.miranda02@cfe.gob.mx

    2008-01-15

    Steam silencers have been placed on the power units regulation system of the Cerro Prieto geothermal field, but not where the steam-pipes vent high-pressure steam (rupture disks). Moreover, the power-unit silencers are large and their abilities to reduce noise depend on an external, uncontrollable factor: pores sizes in the volcanic rocks they are made of. Thus a compact, economic and relatively easy to construct metallic silencer was designed to be used at several points of dry-steam venting to minimize the noise. The design was based on orifice-plate equations and a prototype was constructed and tested. It proved capable of reducing noise by 30 decibels for atmospheric discharges of primary steam at operating pressures. The size of the silencer can be adjusted to the particular needs of each vent case. [Spanish] En el campo geotermico de Cerro Prieto solo existen silenciadores de vapor en el sistema de regulacion de las plantas generadoras, pero no en los sitios de desfogue de vapor a alta presion en los vaporductos (discos de ruptura). Ademas, los silenciadores de las plantas son muy robustos y su capacidad de reduccion del ruido depende de un factor externo no controlable, como es el tamano del poro de la roca volcanica con el que estan construidos. Por lo tanto, se diseno un silenciador metalico compacto, economico y relativamente facil de fabricar, para utilizarse en diversos puntos de descarga de vapor seco a fin de minimizar el ruido. El diseno se realizo con base en las ecuaciones de la placa de orificio. Se construyo un prototipo cuyas pruebas demostraron que es capaz de reducir el ruido hasta en 30 decibeles, al descargar desde la presion de operacion de vapor primario hacia la presion atmosferica. Las dimensiones del silenciador pueden ajustarse a las necesidades particulares de cada caso de desfogue.

  9. Ecologia del lupo in provincia di Genova: distribuzione, consistenza della popolazione, alimentazione, impatto sulla zootecnia

    Directory of Open Access Journals (Sweden)

    Laura Schenone

    2003-10-01

    Full Text Available Dal 1998 la Provincia di Genova ha promosso ricerche sull'ecologia del Lupo nel proprio territorio, riprendendo indagini che si erano interrotte nel 1995. Attraverso la raccolta e la mappatura dei segni di presenza su 15 transetti percorsi stagionalmente è stato individuato un areale in parte corrispondente al Parco naturale regionale dell'Aveto, mentre nelle zone occupate dal Lupo negli anni precedenti si riscontravano solo occasionali segni di presenza. Utilizzando il metodo della conta delle tracce su neve è stata rilevata la presenza di 5 individui. Nel 2000 due censimenti hanno permesso di individuare, rispettivamente, 3 e 2 individui. Le indagini sull'intero territorio provinciale del 2002 hanno ribadito come le aree di maggiore frequentazione continuino ad essere localizzate nel levante della provincia, in particolare nel gruppo del M. Aiona, mentre sullo spartiacque Aveto-Trebbia si registra una presenza più continua rispetto agli anni precedenti. I censimenti del gennaio 2003 hanno evidenziato la presenza di 5 lupi. Alcuni segni di presenza della specie sono stati osservati nell'area del M. Antola e nelle zone al confine tra le province di Alessandria e Piacenza, dove nei primi anni novanta si registrava una presenza stabile del Lupo. Nel settore di ponente della provincia, sono stati rilevati alcuni segni di presenza al confine con la provincia di Savona (passo del Faiallo e un'unica interessante segnalazione presso i Piani di Praglia, al confine con il Parco piemontese delle Capanne di Marcarolo. L'analisi di 199 campioni di feci, raccolte dal 1998 al 2002, ha evidenziato una dieta basata principalmente su tre categorie: ungulati domestici (51,57%, ungulati selvatici (21,33%, altri vertebrati (10,67%. Relativamente consistente, nonostante le basse densità di queste specie nell'area frequentata dal Lupo, la frequenza percentuale di comparsa di Daino (4% e Capriolo (5,33%. Il Cinghiale sembra essere poco utilizzato (12% rispetto all

  10. PRESENCIA DE LA CERÁMICA SEUDO-CLOISONNÉ EN LA CULTURA BOLAÑOS, JALISCO Y ZACATECAS (Presence of the Pseudo-cloisonné Pottery in the Bolaños Culture, Jalisco and Zacatecas)

    OpenAIRE

    María Teresa Cabrero G.

    2012-01-01

    La cerámica seudo-cloisonné tuvo una amplia distribución en el mundo prehispánico mexicano a partir de 200 d. C. Se denominó así por la semejanza en la técnica decorativa con el verdadero cloisonné elaborado sobre metal. La presencia de esta técnica poscocción en la cultura Bolaños, ubicada en parte de los estados de Jalisco y Zacatecas, constituyó una prueba más del contacto comercial que existió con la cultura Chalchihuites (noroeste de Zacatecas); a la cual le llegó a través de la ruta de ...

  11. O dom de jogar bola

    Directory of Open Access Journals (Sweden)

    Sérgio Settani Giglio

    2008-12-01

    Full Text Available Este artigo tem como objetivo investigar como a categoria dom e seus significados interagem com a construção sociocultural do fenômeno futebol. A categoria foi trabalhada a partir da sua relação com a magia e a fé, necessárias num ambiente tão supersticioso como o do futebol brasileiro. A validação do dom enquanto objeto imperativo à compreensão dos êxitos e fracassos no futebol é algo compartilhado não só pelos jogadores, como também pela imprensa esportiva e pelos torcedores. A eficácia simbólica do dom é validada em ato mágico ao ser compartilhada e aceita por seus próprios criadores e consumidores, a ponto de transformar o rico contexto de aprendizado para o futebol, vivido no Brasil, em um simples golpe da sorte: nascer ou não com o dom.This paper aims at investigating how being gifted, as a category for classifying football players, interacts with the sociocultural construction of the sporting phenomenon. The category and its meanings were analyzed in relation to magic and faith, since the Brazilian football environment is very superstitious. Football players and fans and also the press usually attribute success and failure in the sport to being gifted. The symbolic efficacy of the natural ability is validated as it is accepted and conveyed by its own creators and consumers as a magical fact. That sense causes them to signify the rich Brazilian context of learning how to play football as a matter of luck: players are either gifted or non-gifted.

  12. "We are taking you to attend the birth of history": Tlatelolco in Carlos Fuentes' Los 68: París, Praga, México and Roberto Bolaño's Amuleto

    Directory of Open Access Journals (Sweden)

    Susana Domingo Amestoy

    2012-12-01

    Full Text Available Este artículo se propone analizar la novela de Roberto Bolaño Amuleto (1999 y en particular su interés por el límite de una resistencia política. En este estudio se yuxtapone la descripción en la novela de la masacre en Tlatelolco con la obra de Carlos Fuentes Los 68: París, Praga, México (2005, y su uso tanto de la memoria no ficcional de París en 1968 como el recuento ficcional de lo sucedido en Tlatelolco. Este artículo intenta demostrar cómo en Los 68 se intenta recuperar un tipo de subjetividad cuyos imaginarios utópicos definían los años sesenta, y cómo el uso de alegoría en Amuleto marca el vaciamiento de ese imaginario.This paper analyzes Roberto Bolaño’s Amuleto (1999, and in particular its interest in the cotemporary limits of political resistance. The essay subsequently juxtaposes the novel’s depiction of the massacre at Tlateloco with Carlos Fuentes’ Los 68: Paris, Praga, México (2005, and its use of both a non-fictional memoir of Paris in 1968 and a fictionalized account of Tlateloco. Ultimately, this essay demonstrates how Los 68 attempts to recuperate a kind of subjectivity in which utopian imaginaries defined the 1960s, but which Amuleto’s mobilization of allegory reveals as emptied out.

  13. Minería, conflicto y mediadores locales: Minera San Xavier en Cerro de San Pedro, México Mineira, conflito e mediadores locais: Minera San Xavier em Cerro de San Pedro Mining, conflict and local brokers: Minera San Xavier in Cerro de San Pedro

    Directory of Open Access Journals (Sweden)

    Hernán Horacio Schiaffini

    2011-12-01

    Full Text Available Este trabajo indaga en las instancias de mediación que intervienen en la articulación de procesos económicos de gran escala y su puesta en práctica local. Basándonos en el conflicto que se produjo en el Municipio de Cerro de San Pedro (San Luis Potosí, México entre la empresa Minera San Xavier y el Frente Amplio Opositor (FAO a la misma, aplicamos el método etnográfico con el objetivo de describir las estructuras locales de mediación política y analizar sus prácticas y racionalidad. Intentamos demostrar así la importancia de los factores políticos locales en las vinculaciones entre estado, empresa y población.Este trabalho indaga nas instâncias de mediação que intervêm em processos econômicos de grande escala e sua posta em prática local. Baseando-nos no conflito no Cerro de San Pedro (San Luis Potosí, México entre a empresa Minera San Xavier e a Frente Amplio Opositor (FAO aplicamos o método etnográfico pra descrever as estruturas de mediação política locais e analisar suas práticas e racionalidade. Tenta-se demonstrar assim a importância dos fatores políticos locais nas vinculações entre estado, empresa e população.This paper investigates in instances of mediation involved in large-scale economic processes and local implementation. Analyzing the conflict in Cerro de San Pedro (San Luis Potosí, México among San Xavier mining company and the Frente Amplio Opositor (FAO, it applies an ethnographic approach to describe the local structures of political mediation and its practices and rationality. The work shows the relevance of local factors in the relationships between State, company and people.

  14. Transición demográfica en la provincia de Jujuy (1948-2000)

    OpenAIRE

    Eichenberger, Juliana; Alfaro Gómez, Emma Laura; Dipierri, José Edgardo

    2005-01-01

    El cambio demográfico representado por el descenso de las tasas de natalidad y mortalidad se denomina transición demográfica (TD). La Argentina se ubica en el grupo de países con TD avanzada (natalidad y mortalidad moderada o baja con crecimiento natural alrededor del 10‰). Estudios previos indican que en la provincia de Jujuy existen diferencias regionales de la TD. El objetivo de este estudio fue profundizar el análisis de la TD a nivel regional y provincial. Los datos procedieron de los Ce...

  15. Perfil del mercado del jugo de aguaymanto (Physalis peruviana) en la provincia de Barranca

    OpenAIRE

    Guerrero Hurtado, Julio Enrique; Dextre Mendoza, Rodolfo Willian; Guerrero Hurtado, Felicia Antonia

    2015-01-01

    Objetivos: Generar un perfil del mercado del jugo de aguaymanto (Physalis peruviana) en la provincia de Barranca para establecer una planta de producción que permita la obtención de jugo de aguaymanto de excelente calidad. Métodos: Se realizaron encuestas, donde se ha considerado a 150 encuestados, mediante la Aplicación del Método Delphi. El instrumento fue aplicado a expertos. Para elegir el lugar más adecuado, se usó el método de Balanceo de Factores, después de haber evaluado cuantitativ...

  16. Estudio de oligoelementos en suelos de pastos de la provincia de Salamanca. I. Cobre

    OpenAIRE

    Duque Macías, Francisco; González Carreño, Teresita

    2011-01-01

    R E S U M E NSe estudian 67 muestras de suelos de pastos seminaturales de la provincia de Salamanca en cuanto a su contenido en cobre total y extraído por las disoluciones ácido clorhídrico 0,1 N, tampón ácido oxálico-oxalato amónico de pH 3,3 y acetato amónico normal. Las muestras de suelos se agrupan de acuerdo con la roca madre, comprendiendo suelos desarrollados sobre rocas cristalinas, pizarras y arcillas, y conglomerados y areniscas. Para los suelos desarrollados sobre rocas cristalinas...

  17. Estudio de oligoelementos en suelos de pastos de la provincia de Salamanca. II. Cinc

    OpenAIRE

    Duque Macías, Francisco; Martín Polo, José L.

    2011-01-01

    R E S U M E NSe estudian 67 muestras de suelos de pastos seminaturales de la provincia de Salamanca en cuanto a su contenido en cinc total y extraído por las disoluciones: ácido clorhídrico 0,1 N, tampon ácido oxálico-oxalato amónico de pH 3,3 y acetato amónico normal. Las muestras de suelos se agrupan de acuerdo con la roca origen en: a) suelos desarrollados sobre rocas cristalinas; b) suelos desarrollados sobre pizarras y arcillas, y c) suelos desarrollados sobre conglomerados y areniscas. ...

  18. Las actividades económicas de la provincia de Costa Rica. 1569-1610

    OpenAIRE

    Quirós, Claudia

    2002-01-01

    ResumenAnaliza las primeras actividades económicas que desarrollaron en la Provincia de Costa Rica los conquistadores-pobladores-encomenderos. La comercialización del tributo en especie y la ganadería fueron el fundamento de la economía colonial durante el período de estudio (1569-1610).AbstractStudies the economic activities carried out in the Province of Costa Rica be the conqueror- settler- “encomenderos”. Marketing of tribute in kind and livestock were the basis of the Colonial economy du...

  19. Comportamiento de la lepra en la provincia de Las Tunas, 2003-2012

    OpenAIRE

    2014-01-01

    Se realizó un estudio descriptivo de corte transversal, para determinar algunas características epidemiológicas de la incidencia de la lepra, que es una enfermedad transmisible, tan antigua como el hombre mismo. El universo estuvo constituido por los 103 casos notificados con lepra en la provincia de Las Tunas, en el período de enero de 2003 a diciembre de 2012. La información se obtuvo por las encuestas epidemiológicas existentes en el Departamento de Estadística de la Dirección Provincial d...

  20. Provincia de Santa Marta y Río Hacha del Virreynato de Santa Fe

    Directory of Open Access Journals (Sweden)

    Boletín Cultural y Bibliográfico Banco de la República

    1962-10-01

    Full Text Available Relación, o informe de la Provincia de S.ta Marta y Rio Hacha por lo que respecta al estado actual de su Comercio, Labranzas, Haciendas, y Frutos; que manifiesta los pocos que se cogen ahora, y los que pueden cultivarse, y conviene fomentar para aumento de su Comercio, y Agricultura; las causas de su decadencia, y medios que se consideran oportunos, para adelantar estos importantes objetos con beneficio de la Prov.a, de sus vecinos, y de todo el R.no.

  1. Mujeres y educación en la provincia de Sevilla

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    Carolina del Valle Ramos

    2004-01-01

    Full Text Available En los últimos años, la búsqueda por mejorar las condiciones de vida y el status social, así como por conseguir la igualdad entre sexos, ha generado un aumento considerable del número de mujeres que demandan un mayor nivel de estudios. En este trabajo se presenta la situación actual de la mujer en la provincia de Sevilla y algunas de las vías que éstas han encontrado para ampliar o mejorar su nivel formativo, como son las escuelas taller, talleres de empleo, casas de oficio, la teleformación o las universidades populares.

  2. Le zone libere partigiane in provincia di Piacenza: un primo sguardo d’insieme

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    Iara Meloni

    2016-05-01

    Full Text Available Il saggio traccia un primo quadro delle zone libere partigiane sorte in provincia di Piacenza nel corso dell’estate-autunno 1944, analizzandone sia l’importanza strategico-militare che le realizzazioni in campo politico-amministrativo. In particolare si è evidenziato il ruolo di controllo e coordinamento portato avanti dal Commissariato Civile per i Comuni liberati e liberandi dalle formazioni partigiane istituito nell’ottobre 1944 dal Comitato di Liberazione provinciale di Piacenza con l’intento di supervisionare le attività delle giunte dei Comuni liberati.

  3. Brote de fiebre amarilla en comunidad aguaruna en la provincia de Bagua, DIRESA Amazonas. Diciembre 2005

    OpenAIRE

    Clendenes Alvarado, Orlando Martín; Pachas Chávez, Paul; Quezada Tirado, Héctor Eduardo; Arévalo Daza, Luis; Purisaca Morante, Enrique; Díaz Díaz, Artidoro; Espinoza Silva, Máximo Manuel

    2006-01-01

    El 26 de diciembre de 2006, el Ministerio de Salud toma conocimiento de un brote de una enfermedad caracterizada como un síndrome febril hemorrágico, en la localidad de Alto Tuntus de la etnia Aguaruna, en la provincia de Bagua. Esta localidad se encuentra a siete días de camino por trocha. El acceso más rápido es a través de helicóptero. Hasta el 28 de diciembre se tenía conocimiento oficial de 73 casos identificados y siete fallecidos, en una comunidad de aproximadamente 425 habitantes....

  4. Encuesta de helmintos intestinales en la provincia de Sandia (Departamento de Puno)

    OpenAIRE

    2013-01-01

    En 290 sujetos de la provincia de Sandia, departamento de Puno, el examen microscópico de una muestra de heces proveniente de cada uno de ellos, mostró: 1. La incidencia del parasitismo intestinal a helmintos es considerablemente alta (91. 03% ) 2. La incidencia por especie de parásito que se ha determinado es la siguiente: 3. La incidencia por localidades, en el caso de Ancylostoma o Necator y de S. stercoralis, aumenta a medida que se desciende hacia la Selva. 4. La asociación de helmintos...

  5. Encuesta de helmintos intestinales en la provincia de Sandia (Departamento de Puno

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    Efraín Santillana

    1956-12-01

    Full Text Available En 290 sujetos de la provincia de Sandia, departamento de Puno, el examen microscópico de una muestra de heces proveniente de cada uno de ellos, mostró: 1. La incidencia del parasitismo intestinal a helmintos es considerablemente alta (91. 03% 2. La incidencia por especie de parásito que se ha determinado es la siguiente: 3. La incidencia por localidades, en el caso de Ancylostoma o Necator y de S. stercoralis, aumenta a medida que se desciende hacia la Selva. 4. La asociación de helmintos más frecuente ha sido Ascaris lumbricoides-Trichocephalus trichiurus.

  6. Gestión presupuestaria de las administraciones locales. Caso de la provincia de Huelva

    OpenAIRE

    Carretero Peñalva, Lucía

    2016-01-01

    La administración local es el total de administraciones públicas correspondientes a todas las entidades locales que pueden ser: municipios, como entidad local más común, provincias, islas, comarcas, áreas metropolitanas y mancomunidades. Estas entidades locales tienen diferentes competencias, que varían de unas a otras; su financiación procede principalmente de tributos que reciben, entre los que se encuentran: impuestos, tasas y contribuciones especiales, además de otros ingresos procedentes...

  7. El acoso escolar en Educación Primaria en la provincia de Huelva

    OpenAIRE

    Ávila Fernández, José Antonio (Coordinador)

    2014-01-01

    El resumen que a continuación se presenta, es el reflejo del trabajo de tesis doctoral realizado bajo el título «El Acoso Escolar en Educación Primaria en la Provincia de Huelva». En los últimos años ha existido una preocupación social en relación al tema de la violencia escolar, reconociéndose como un problema común. Los medios de comunicación se han ocupado de difundir situaciones límites relacionadas con e! comportamiento de escolares; a nivel internacional se ha afrontado la investigac...

  8. Primer registro de Tityus trivittatus (Scorpiones: Buthidae en la provincia de Mendoza (Argentina

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    Florencia FERNÁNDEZ CAMPÓN

    2009-01-01

    Full Text Available En la siguiente nota se informa sobre el primer registro delescorpión Tityus trivittatus Kraepelin en la provincia de Mendoza en el Barrio Campo Papa, departamento de Godoy Cruz. T. trivittatus es dentro de nuestro país una de las especies de escorpiones con importancia médica, debido a que su veneno neurotóxico puede causar lesiones en el sistema nervioso y en algunos casos la muerte, particularmente en niños.

  9. Caracterización de manantiales del departamento Ancasti en la provincia de Catamarca (Argentina)

    OpenAIRE

    Denim, Pablo; l Instituto Nacional de Tecnología, Estación Experimental Agropecuaria Catamarca, Ruta 33- Km 4,5. Valle Viejo, Catamarca, Argentina.; Cano, Laura; Instituto Nacional de Tecnología, Estación Experimental Agropecuaria Catamarca, Ruta 33- Km 4,5. Valle Viejo, Catamarca, Argentina.; Castro, Ornella; l Instituto Nacional de Tecnología, Estación Experimental Agropecuaria Catamarca, Ruta 33- Km 4,5. Valle Viejo, Catamarca, Argentina.

    2015-01-01

    Las poblaciones de la provincia de Catamarca, Argentina no tienen acceso al agua o el acceso es muy precario. Entre estas poblaciones se encuentran las de El Huayco, El Arbolito y El Puesto Nuevo, en el departamento Ancasti, donde cada familia y una escuela de la zona poseen su propia vertiente. En estos lugares se realizaron obras de captación de agua, a fin de que cada familia y la escuela tengan disponibilidad de este recurso. Con el objetivo de conocer la calidad del agua de abastecimient...

  10. Las investigaciones de Campo Nassif 1, Valle de Piedra Parada, Provincia del Chubut

    OpenAIRE

    Onetto, María

    1987-01-01

    El presente trabajo forma parte de las investigaciones que se han venido desarrollando desde 1979 como parte del Proyecto de Rescate del Patrimonio Arqueológico de la Provincia del Chubut: zona del río Chubut Medio (Aschero y otros, 1983). En un trabajo anterior informamos sobre los resultados preliminares de nuestras investigaciones en el sitio Campo Nassif 1 (Onetto, 1983). Posteriormente –en las Primeras Jornadas de Arqueología de la Patagonia- comunicamos la obtención de un fechado radioc...

  11. Manuale del recupero de la arquitectura vernacular de la provincia de Loja, Ecuador

    OpenAIRE

    Eguiguren Franco, Daniel Eduardo

    2016-01-01

    El presente trabajo está enfocado en primer lugar a la necesidad de conocer y poner en valor la arquitectura vernacular de la provincia de Loja, considerando que el conocimiento constituye el primer paso hacia la conservación. Por otro lado la importancia de proporcionar un método práctico de la forma de construir como herramienta clave para la intervención, donde se ha intentado transmitir el valor de la arquitectura vernacular en sus aspectos históricos, simbólicos, técnico-constructivos, f...

  12. Notes on the ecology of Phyllodactylus reissi (Phyllodactylidae: Sauria in Parque Nacional Cerros de Amotape (Tumbes, Peru

    Directory of Open Access Journals (Sweden)

    Juan Carlos Jordán Arizmendi

    2012-02-01

    Full Text Available Some basics aspects on the ecology of the nocturnal gecko Phyllodactylus reissi from Parque Nacional Cerros de Amotape (Tumbes, Peru are described. This species used rock boulders (57,4% and trees (31,9% as microhabitats primarily, exhibiting a nocturnal activity pattern, with a peak between 2100-2200 hours, remaining active until midnight. Body temperature (mean 24,4 ºC was correlated with both air and substrate temperature, with the last variable affecting in higher degree (47% the body temperature of this species. The slightly high body temperature of Phyllodactylus reissi, compared to other Phyllodactylus geckos, could be related to nocturnal microhabitat use and diurnal retreat site selection. More studies on lizard ecology from this endangered ecosystem are needed.

  13. Estudio de la líqueno flora encontrada en el Cerro de Quininí, Tibacuy, Cundinamarca

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    Hormaza Francisco

    2000-12-01

    Full Text Available

    Se realizó un muestreo de la liquen o flora del cerro de Quininí, Tibacuy, Cundinamarca para estudiar las características morfológicas externas de los géneros de líquenes encontrados en el. A su vez se hizo la revisión bibliográfica acerca de dichos géneros, datando así la riqueza de líquenes en la zona con 8 géneros en total y con respecto al papel de bioindicadores se mostró el grado de intervención para el lugar.

  14. Dry steam feed zones and silica scaling as major controls of total flow enthalpy at Cerro Prieto, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Beall, J.J. [Calpine Corp., Santa Rosa, CA (United States); Ledesma, A.P.; Dios Ocampo, J. de [Constructora y Perforadora Latina S.A., Baja California (Mexico)

    1997-12-31

    Enthalpy and chloride data for Cerro Prieto well fluids define a mixing line between original reservoir liquid (1,300-1,500 J/g, 9,000-11,000 ppm Cl) and superheated steam (2870 J/g, 0 ppm Cl). The mixing relationship establishes that dry steam feed zones contribute to the total fluid flow of many wells. Fluids produced from newly completed or worked over wells often show rapid movement in either direction along the enthalpy-chloride mixing line. The direction of movement along the enthalpy-chloride mixing line depends upon whether increased formation boiling (increasing the dry steam flow to the well) or silica scaling in the formation and on the surface of the well bore (which inhibits the flow of dry steam) is the dominant process.

  15. Results of the first order leveling surveys in the Mexicali Valley and at the Cerro Prieto field

    Energy Technology Data Exchange (ETDEWEB)

    de la Pena L, A.

    1981-01-01

    The results obtained from the third leveling survey carried out by the Direccion General de Geografia del Territorio Nacional (previously DETENAL) during November and December 1979 are presented. Calculations of the changes in field elevation and plots showing comparisons of the 1977, 1978, and 1979 surveys are also presented. Results from a second order leveling survey performed to ascertain the extent of ground motion resulting from the 8 June 1980 earthquake are presented. This magnitude ML = 6.7 earthquake with epicenter located 15 km southeast of the Guadalupe Victoria village, caused fissures on the surface, the formation of small sand volcanos, and the ejection of ground water in the vicinity of the Cerro Prieto field. This leveling survey was carried out between benchmark BN-10067 at the intersection of the Solfatara canal and the Sonora-Baja California railroad, and benchmark BN-10055 located at the Delta station.

  16. Curie point depth from spectral analysis of aeromagnetic data from Cerro Prieto geothermal area, Baja California, México

    Science.gov (United States)

    Espinosa-Cardeña, J. M.; Campos-Enriquez, J. O.

    2008-10-01

    Using aeromagnetic data acquired in the area from the Cerro Prieto geothermal field, we estimated the depth to the Curie point isotherm, interpreted as the base of the magnetic sources, following statistical spectral-based techniques. According to our results the Curie point isotherm is located at a depths ranging from 14 to 17 km. Our result is somewhat deeper than that obtained previously based only in 2-D and 3-D forward modeling of previous low-quality data. However, our results are supported by independent information comprising geothermal gradients, seismicity distribution in the crust, and gravity determined crustal thickness. Our results imply a high thermal gradient (ranging between 33 and 38 °C/km) and high heat flow (of about 100 mW/m 2) for the study area. The thermal regime for the area is inferred to be similar to that from the Salton trough.

  17. Active metasomatism in the Cerro Prieto geothermal system, Baja California, Mexico: a telescoped low pressure/temperature metamorphic facies series

    Energy Technology Data Exchange (ETDEWEB)

    Schiffman, P.; Elders, W.A.; Williams, A.E.; McDowell, S.D.; Bird, D.K.

    1983-01-01

    In the Cerro Prieto geothermal field, carbonate-cemented, quartzofeldspathic sediments of the Colorado River delta are being actively metasomatized into calc-silicate metamorphic rocks by reaction with alkali chloride brines between 200/sup 0/ and 370/sup 0/C, low fluid and lithostatic pressures, and low oxygen fugacities. Petrologic investigations of drill cores and cutting from over 50 wells in this field identified a prograde series of calc-silicate mineral zones which include as index minerals: wairakite, epidote, prehnite, and clinopyroxene. Associated divariant mineral assemblages are indicative of a very low pressure/temperature metamorphic facies series which encompasses the clay-carbonate, zeolite, greenschist, and amphibolite facies. This hydrothermal metamorphic facies series, which is becoming increasingly recognized in other active geothermal systems, is characterized by temperature-telescoped dehydration and decarbonation mineral equilibria. Its equivalent should now be sought in fossil hydrothermal systems.

  18. Burning down the brewery: Establishing and evacuating an ancient imperial colony at Cerro Baúl, Peru

    Science.gov (United States)

    Moseley, Michael E.; Nash, Donna J.; Williams, Patrick Ryan; deFrance, Susan D.; Miranda, Ana; Ruales, Mario

    2005-01-01

    Before the Inca reigned, two empires held sway over the central Andes from anno Domini 600 to 1000: the Wari empire to the north ruled much of Peru, and Tiwanaku to the south reigned in Bolivia. Face-to-face contact came when both colonized the Moquegua Valley sierra in southern Peru. The state-sponsored Wari incursion, described here, entailed large-scale agrarian reclamation to sustain the occupation of two hills and the adjacent high mesa of Cerro Baúl. Monumental buildings were erected atop the mesa to serve an embassy-like delegation of nobles and attendant personnel that endured for centuries. Final evacuation of the Baúl enclave was accompanied by elaborate ceremonies with brewing, drinking, feasting, vessel smashing, and building burning. PMID:16293691

  19. IMPACT OF ADDITIONALS CONTAMINANTS DUE TO ACID MINE DRAINAGE IN TRIBUTARIES OF THE PILCOMAYO RIVER FROM CERRO RICO, POTOSÍ, BOLIVIA

    Directory of Open Access Journals (Sweden)

    William H.J. Strosnider

    2014-09-01

    Full Text Available Intensive mining and processing of the polymetallic sulfide ore body of Cerro Rico de Potosí (Bolivia has occurred since 1545. To further investigate acid mine drainage (AMD discharges and their link to downstream contamination, data were gathered during two sampling events during the most extreme periods of the dry and wet seasons of one year. Concentrations of Ag, B, Ba, Mo, Sb, Se, Sn and V in AMD and receiving streams were greater than Bolivian discharge limits and receiving water body guidelines as well as international agricultural use standards. High concentrations of rare earth metals have been documented in this area. Results indicate that contamination from mining has a larger scope than previously thought and underscore the importance of remediation.

  20. The ash deposits of the 4200 BP Cerro Blanco eruption: the largest Holocene eruption of the Central Andes

    Science.gov (United States)

    Fernandez-Turiel, Jose-Luis; Saavedra, Julio; Perez-Torrado, Francisco-Jose; Rodriguez-Gonzalez, Alejandro; Carracedo, Juan-Carlos; Lobo, Agustin; Rejas, Marta; Gallardo, Juan-Fernando; Osterrieth, Margarita; Carrizo, Julieta; Esteban, Graciela; Martinez, Luis-Dante; Gil, Raul-Andres; Ratto, Norma; Baez, Walter

    2015-04-01

    We present new data about a major eruption -spreading approx. 110 km3 ashes over 440.000 km2- long thought to have occurred around 4200 years ago in the Cerro Blanco Volcanic Complex (CBVC) in the Central Andes of NW Argentina (Southern Puna, 26°45' S, 67°45' W). This eruption may be the biggest during the past five millennia in the Central Volcanic Zone of the Andes, and possibly one of the largest Holocene eruptions in the world. Discrimination and correlation of pyroclastic deposits of this eruption of Cerro Blanco was conducted comparing samples of proximal (domes, pyroclastic flow and fall deposits) with distal ash fall deposits (up to 400 km from de vent). They have been characterized using optical and electron microscopy (SEM), X-ray diffraction, particle-size distribution by laser diffraction and electron microprobe and HR-ICP-MS with laser ablation for major and trace element composition of glass, feldspars and biotite. New and published 14C ages were calibrated using Bayesian statistics. An one-at-a-time inversion method was used to reconstruct the eruption conditions using the Tephra2 code (Bonadonna et al. 2010, https://vhub.org/resources/tephra2). This method allowed setting the main features of the eruption that explains the field observations in terms of thickness and grain size distributions of the ash fall deposit. The main arguments that justify the correlation are four: 1) Compositional coincidence for glass, feldspars, and biotite in proximal and distal materials; 2) Stratigraphic and geomorphological relationships, including structure and thickness variation of the distal deposits; 3) Geochronological consistency, matching proximal and distal ages; and 4) Geographical distribution of correlated outcrops in relation to the eruption centre at the coordinates of Cerro Blanco. With a magnitude of 7.0 and a volcanic explosivity index or VEI 7, this eruption of ~4200 BP at Cerro Blanco is the largest in the last five millennia known in the Central

  1. Rutas turísticas culturales de la provincia de Cádiz: Castillos y fortalezas medievales

    OpenAIRE

    Roldán Corrales, Ana

    2015-01-01

    El presente documento trata sobre una de las rutas turísticas más singulares de la provincia de Cádiz que recorre sus castillos y fortalezas. Se inicia este estudio con una amplia introducción histórica que pretende informar al lector sobre el origen de este extenso Patrimonio Cultural: La Arquitectura defensiva de la provincia de Cádiz, justificada por la situación geoestratégica a lo largo de la historia.

  2. La administración de la provincia de Sonora: los alcaldes mayores en la primera mitad del siglo XVIII

    OpenAIRE

    Borrero Silva, María del Valle

    2008-01-01

    En este trabajo se quiere mostrar cómo funcionaban las alcaldías mayores en una provincia de la frontera novohispana, Sonora. Provincia que hasta 1732 va a depender del gobierno de la nueva Vizcaya, por lo tanto los alcaldes mayores tenían como autoridad superior a tal gobernador, aunque para todo lo judicial dependían de la Audiencia neogallega. Esta doble dependencia originó a lo largo del siglo XVIII muchos conflictos de intereses, que los propios alcaldes manejaron para su propio interés ...

  3. Una fosa-vertedero de época vettona en el Cerro de la Mesa (Alcolea de Tajo, Toledo

    Directory of Open Access Journals (Sweden)

    Chapa Brunet, Teresa

    2013-06-01

    Full Text Available The existence of pits filled with earth, ashes, pottery fragments and fauna, usually known as ash pits, rubbish pits or dumps, has been recognized on many Second Iron Age settlements of the Spanish Northern Plateau, generally linked with Vaccean and Vettonian groups. However, its distribution should be extended to the west of the Southern Plateau and eastern Extremadura, as evidenced by the example of the Cerro de la Mesa village and indications coming from other western sites. We offer here a detailed study of part of a rubbish pit where certain domestic remains were withdrawn in connection with a new project of urbanisation of the Vettonian village held on the transition from the 3rd to the 2nd centuries BC.La existencia de fosas rellenas con tierra, cenizas, fragmentos cerámicos y fauna denominadas genéricamente como cenizales, basureros o vertederos, es un hecho bien conocido en la Meseta Norte durante la Segunda Edad del Hierro, vinculándose con los grupos Vacceos y Vettones. Sin embargo, su distribución debe ampliarse al occidente de la Meseta Sur y oriente extremeño, como se evidencia tanto en el Cerro de la Mesa como a través de indicios documentados en otros yacimientos más occidentales. Se presenta aquí un detallado estudio de un sector de la fosa que actuó como vertedero para la retirada de ciertos restos domésticos con ocasión de la reurbanización en profundidad del poblado vettón que tuvo lugar en la transición del siglo III al II a.C.

  4. Volcanismo máfico terciario de la Puna jujeña, los Cerros Negros de Jama.

    Directory of Open Access Journals (Sweden)

    Caffe, Pablo, J.

    2011-12-01

    Full Text Available Tertiary mafic volcanism of the Jujuy Puna, the Cerros Negros de Jama. The Cerros Negros de Jama (23°29’ S – 66°56’ W monogenetic volcanoes belong to a group of eruptive centers that are representative of the most mafic magmatism in the northern Puna during the Cenozoic. They comprise scoria cones and associated lava flows erupted during coeval strombolian and effusive volcanic activity.Aphyric to microporphyritic skeletal textures and microphenocryst assemblages dominated by olivine and/or orthopyroxene suggest inexistent or short residence times in supracrustal magma chambers, as well as magma temperatures higher than 1000º C and near to water saturation conditions. The frequent occurrence of magmatic quartz xenocrysts with different degrees of reaction suggests assimilation of silicic magmas/igneous rocks under variable P-T conditions. A combination of large ascent rates and strong turbulence, together with an overheating of the magmas would have been crucial for this in-route contamination process.The Jama volcanic rocks are basaltic andesites and andesites to trachyandesites which belong to the high-K calcalkaline series. The observed geochemical signature is typical of continental arc magmas, showing negative anomalies of Nb, Ta and P, La/Ta > 30 and Ba/Nb > 25. Two main groups of rocks with different evolution patterns can be distinguished from major and trace element diagrams. Different concentrations of some elements at intermediate degrees of evolution point to variable degrees of incompatibility for them, which in turn may have been caused by magma evolution at different depths from the same or different primary magmas.

  5. Stress controlled magma-earthquake interaction during unrest at Chiles-Cerro Negro Volcanoes (Ecuador-Colombian border)

    Science.gov (United States)

    Ebmeier, S. K.; Elliott, J. R.; Nocquet, J. M.; Biggs, J.; Mothes, P. A.; Lundgren, P.; Samsonov, S. V.; Jarrin, P.; Yepez, M.; Aguaiza, S.

    2015-12-01

    The movement of fluids beneath a volcano can cause deformation, and therefore changes to the subsurface stress field that manifest in swarms of low magnitude (Chiles-Cerro Negro volcanoes on the Ecuador-Colombian border. These volcanoes were previously considered to be historically inactive, but between 2013 and early 2015 there were three episodes of unrest characterised by VT swarms of increasing energy and duration. GPS measurements at two stations near Volcán Chiles show inflation over a time period of approximately twenty days prior to the 20th October, consistent with the intrusion of magma at half space depths >13 km. This inflation took place during a swarm of VT seismicity with thousands of low magnitude events per day and culminated in a M 5.6 earthquake on the 20th October, when inflation abruptly ceased. We measure coseismic displacements from the M 5.6 earthquake with data from three independent InSAR platforms and find that they are consistent with shallow slip of 1.2 m on an oblique reverse fault. This fault plane would have experienced positive Coulomb stress changes from some of the range of potential sources consistent with the inflation. Magmatic intrusion could therefore have contributed to the loading on the fault directly through stress changes caused by pressurisation, and indirectly through the decrease in effective friction coefficient due to elevated pore fluid pressure. The cessation of inflation immediately after the moderate earthquake suggests a link between the two events. We expect slip on the fault plane identified from the InSAR data to have resulted in compression in the shallow crust south of Volcán Chiles, above the source that had previously been inflating. This would have inhibited further ascent of magma. The Chiles-Cerro Nego unrest provides rare observations of interaction between magmatic intrusion and a moderate earthquake during volcanic unrest.

  6. Analysis of the Nuevo Leon Magnetic Anomaly and its possible relation to the Cerro Prieto magmatic-hydrothermal system

    Energy Technology Data Exchange (ETDEWEB)

    Goldstein, N.E.; Corrigan, D.J.; Wilt, M.J.

    1984-01-01

    The broad dipolar magnetic anomaly whose positive peak is centered near Ejido Nuevo Leon, some 5 km east of the Cerro Prieto I power plant, has long been suspected to have a genetic relationship to the thermal source of the Cerro Prieto geothermal system. This suspicion was reinforced after several deep geothermal wells, drilled to depths of 3-3.5 km over the anomaly, intersected an apparent dike-sill complex consisting mainly of diabase but with minor rhyodacite. A detailed fit of the observed magnetic field to a computer model indicates that the source may be approximated by a tabular block 4 x 6 km in area, 3.7 km in depth, 2.3 km thick, and dipping slightly to the north. Mafic dike chips from one well, NL-1, were analysed by means of electron microprobe analyses which showed them to contain a titanomagnetite that is paramagnetic at in situ temperature conditions. As the dike mineralogy does not account for the magnetic anomaly, the magnetic source is believed to be a deeper, magnetite-rich assemblage of peridotite-gabbro plutons. The suite of igneous rocks was probably emplaced at a shallow depth in response to crustal extension and thinning brought on by en echelon strike-slip faulting. The bottom of the magnetic source body, at an estimated depth of 6 km, is presumed to be at or near that of the Curie isotherm (575/sup 0/C) for magnetite, the principal ferromagnetic mineral in peridotiticgabbroic rocks. The geological model derived from the magnetic study is generally supported by other geophysical data. In particular, earthquake data suggest dike injection is occurring at depths of 6-11 km in an area beneath the magnetic source. Thus, it is possible that heat for the geothermal field is being maintained by continuing crustal extension and magmatic activity.

  7. Analysis of the Nuevo Leon magnetic anomaly and its possible relation to the Cerro Prieto magmatic-hydrothermal system

    Energy Technology Data Exchange (ETDEWEB)

    Goldstein, N.E.; Wilt, M.J.; Corrigan, D.J.

    1982-10-01

    The broad dipolar magnetic anomaly whose positive peak is centered near Ejido Nuevo Leon, some 5 km east of the Cerro Prieto I Power Plant, has long been suspected to have a genetic relationship to the thermal source of the Cerro Prieto geothermal system. This suspicion was reinforced after several deep geothermal wells, drilled to depths of 3 to 3.5 km over the anomaly, intersected an apparent dike-sill complex consisting mainly of diabase but with minor rhyodacite. A detailed fit of the observed magnetic field to a computer model indicates that the source may be approximated by a tabular block 4 by 6 km in area, 3.7 km in depth, 2.3 km thick, and dipping slightly to the north. Mafic dike chips from one well, NL-1, were analyzed by means of electron microprobe analyses which showed tham to contain a titanomagnetite that is paramagnetic at in-situ temperature conditions. As the dike mineralogy does not account for the magnetic anomaly, the magnetic source is believed to be a deeper, magnetite-rich assemblage of peridotite-gabbro plutons. the suite of igneous rocks was probably passively emplaced at a shallow depth in response to crustal extension and thinning brought on by strike-slip faulting. The bottom of the magnetic source body, at an estimated depth of 6 km, is presumed to be at or near that of the Curie isotherm (575/sup 0/C) for magnetite, the principal ferromagnetic mineral in peridotitic-gabbroic rocks. The geological model derived from the magnetic study is generally supported by other geophysical data. In particular, earthquake data suggest dike injection is occurring at depths of 6 to 11 km in an area beneath the magnetic source. Thus, it is possible that heat for the geothermal field is being maintained by continuing crustal extension and magmatic activity.

  8. Minería, conflicto y mediadores locales: Minera San Xavier en Cerro de San Pedro, México Mineira, conflito e mediadores locais: Minera San Xavier em Cerro de San Pedro Mining, conflict and local brokers: Minera San Xavier in Cerro de San Pedro

    OpenAIRE

    Hernán Horacio Schiaffini

    2011-01-01

    Este trabajo indaga en las instancias de mediación que intervienen en la articulación de procesos económicos de gran escala y su puesta en práctica local. Basándonos en el conflicto que se produjo en el Municipio de Cerro de San Pedro (San Luis Potosí, México) entre la empresa Minera San Xavier y el Frente Amplio Opositor (FAO) a la misma, aplicamos el método etnográfico con el objetivo de describir las estructuras locales de mediación política y analizar sus prácticas y racionalidad. Intenta...

  9. Configuration of the mudstones, gray- and coffee-colored shale lithologic units, zones of silica and epidote, and their relation to the tectonics of the Cerro Prieto geothermal field

    Energy Technology Data Exchange (ETDEWEB)

    Cobo R, J.M.

    1981-01-01

    Based on well cuttings, five lithological units have been recognized within the area of what is now the Cerro Prieto geothermal field. These five units are described. Differences in origin, mineralogy, grading, color, compaction, etc., are shown.

  10. Cimarrones y palenques en las provincias al norte del Nuevo Reino de Granada siglo XVII

    Directory of Open Access Journals (Sweden)

    María Cristina Navarrete P.

    2001-01-01

    Full Text Available A finales del siglo XVII, ya existían comunidades de cimarrones en varias provincias de la jurisdicción de la Audiencia del Nuevo Reino de Granada. Hacia 1598, en Zaragoza, y en 1607, en Remedios, provincia de Antioquia, esclavos negros de las rancherías mineras se levantaron violentamente y fortificaron en palenques, causando perjuicios en el comercio, la vida de las ciudades y la labor de las minas. Otro de los más importantes alzamientos de esclavos fue el dirigido por Domingo Biohó quien se refugió con sus seguidores en la Ciénaga de la Matuna. Asimismo, las Sierras de María y la Serranía de San Lucas fueron espacios de establecimiento de palenques. Los cimarrones intentaron reconstruir organizaciones sociales con base en la herencia cultural africana, en la permanencia en las haciendas y minas al contacto con amos, capataces y compañeros de circunstancias y, en las nuevas condiciones que les ofrecía la vida de los palenques.

  11. LA ACTIVIDAD HIDROCARBURÍFERA EN LA PROVINCIA DE NEUQUÉN.

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    Beatriz Saint-Lary

    2000-12-01

    Full Text Available Si se tiene en cuenta que la actividad energética constituye el eje del desarrollo económico de la provincia del Neuquén, que de los tres circuitos que la conforman- hidroeléctrico, del petréleo y del gas- son estos dos últimos los que tiene mayores implicancias en los preceso socioeconómicos regionales y en la configuración territorial neuquina y que, además, a partir de 1990 se han producido transformaciones estructurales que han modificado radicalmente las relaciones de produción, de reproduccion social y de acumulación de capital en los referidos circuitos, es indispensable caracterizar estas actividades para comprender la dinámica socioeconómica y territorial de la provincia y, en especial, de los centros urbanos que nacieron y se desarrollaron como consecuencia de la explotación del petroleo y del gas.

  12. Decrecimiento y renovadas estrategias para un territorio agotado. El caso de la provincia de Alicante

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    Xavier Amat Montesinos

    2015-01-01

    Full Text Available Las consecuencias del último boom inmobiliario han abierto el debate alrededor del crecimientourbano en España, especialmente en áreas con una fuerte presión turística y residencial. En estetrabajo se analizan algunas de las implicaciones de la crisis financiera mundial sobre la planificaciónurbanística municipal, centrando el estudio en la provincia de Alicante, uno de los ámbitosque mejor ilustran el éxito y la caída del modelo inmobiliario hispano. La unidad básica de análisisla componen las figuras de planeamiento municipal y estrategias territoriales vigentes, y sutraducción en suelos urbanos inconclusos. Considerando que se trata de actuaciones durmientesa la espera de un contexto económico favorable, la situación hace pensar que la burbuja inmobiliariano estaría estallada sino tan sólo desinflada.El objetivo es reflexionar, con carácter propositivo, sobre las estrategias de gestión del territorioque emergen durante los últimos años a raíz de la crisis financiera e inmobiliaria, tratando derelanzar algunas cuestiones que deberían preocupar en la planificación urbanística y territorialde la provincia de Alicante, y por extensión, de otros espacios afectados por el crash inmobiliario.

  13. Criterios sobre la uniformidad de riego en cultivos protegidos de las provincias centrales

    Directory of Open Access Journals (Sweden)

    Miriel Ajete Gil

    2011-01-01

    Full Text Available El presente trabajo tiene como objetivo evaluar aspectos técnicos en sistemas de riego de las provincias centrales del país pertenecientes al Programa de Cultivos Protegidos del MINAG. A partir de la puesta en explotación de los primeros módulos comienzan a presentarse deficiencias en la uniformidad del riego. En las casas de posturas, en Camagüey se ensayó una solución alternativa utilizando el emisor bailarina con resultados preliminares aceptables, experiencia que se extendió posteriormente a otros módulos. Además se realizaron evaluaciones de uniformidad del riego en cuatro provincias, los resultados ratifican la calidad del riego por goteo con el emisor Twin Drip utilizado en cultivos protegidos, mientras en las casas de posturas con el emisor microjet de 2 x 1400 de 1 mm de producción nacional los resultados fueron ineficientes, y con el emisor "bailarina" fueron aceptables.

  14. Distribución y Hospederos de pulgas (Siphonaptera en la Provincia de Ayabaca, Piura - 1999

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    Edwar J Pozo

    2005-10-01

    Full Text Available Estudio descriptivo transversal realizado en la provincia de Ayabaca (zona endémica de peste bubónica, departamento de Piura, Perú; con el objetivo de ampliar los conocimientos sobre las especies de pulgas presentes. Fueron colectados 10 152 especimenes de pulgas en 46 localidades pertenecientes a seis distritos de la provincia de Ayabaca (Suyo, Sapillica, Montero, Paimas, Lagunas y Ayabaca, entre los meses de enero a julio de 1999. El muestreo se realizó seleccionando para cada vivienda un mínimo de cinco ropas de cama y cinco cuyes (Cavia porcellus además de la totalidad de los roedores capturados en las viviendas y en el área silvestre. Ocho especies de pulgas fueron identificadas (Pulex irritans, Tiamastus cavicola, Polygenis litargus, Xenopsylla cheopis, Ctenocephalides felis, Craneopsylla minerva, Leptopsylla segnis y Cediopsylla spillmanni de éstas, P. irritans se reportó en todos los distritos muestreados, seguida de X. cheopis y P. litargus, encontradas en cinco de los seis distritos.

  15. Nuevos registros de squamata (reptilia para el pleistoceno superior del norte de la provincia de Buenos Aires, Argentina

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    Federico Agnolin

    2011-01-01

    Full Text Available En el presente artículo son reportados ejemplares de diversos taxones de reptiles escamados fósiles procedentes de la base de la Formación Luján (Pleistoceno Superior, en la localidad fosilífera de Merlo, provincia de Buenos Aires, Argentina. Entre los ejemplares registrados se reconoce el primer registro fósil para el género y especie Anops kingii (Amphisbaenidae; asimismo se reporta la presencia de especies indeterminadas de los géneros Homonota (Gekkonidae y Liolaemus (Liolaemidae. La asociación conjunta de estos tres taxones hoy en día no se encuentra representada en el norte de la provincia de Buenos Aires, siendo la región geográficamente más cercana en donde encuentran una superposición en su distribución el Partido de Balcarce, ubicado en el extremo Sureste de la provincia y alejado unos 600 kilómetros al sur de la localidad fosilífera de Merlo. La presencia conjunta de estos tres reptiles se encuentra de acuerdo con la posible existencia de un pulso árido y frío, tal como ha sido propuesto con anterioridad para porción más inferior del Pleistoceno Superior en la provincia de Buenos Aires.

  16. Nuevas citas de Asteraceae para la provincia de Catamarca (Argentina) New records of Asteraceae for the province of Catamarca (Argentina)

    OpenAIRE

    Susana E. Freire; Bayón, Néstor D.; Daniel A. Giuliano; Luis Ariza Espinar; Sáenz, Alcides A.; Claudia Monti; Gustavo Delucchi

    2011-01-01

    Se mencionan los siguientes nuevos registros de Asteráceas para la provincia de Catamarca, Argentina: Baccharis acaulis, B. boliviensis var. latifolia, B. flexuosa, B. glutinosa var. angustissima, B. stenophylla (Tribu Astereae), Eupatorium patens var. tomentosum (Tribu Eupatorieae), Cosmos bipinnatus, C. peucedanifolius var. peucedanifolius, Helianthus annuus (Tribu Heliantheae), Gamochaeta erythractis, G. longipedicellata, Gnaphalium lacteum, Tessaria integrifolia var. integrifolia (Tribu I...

  17. LA COSMOVISIÓN DEL OCCIDENTE DE MÉXICO EN LA TRADICIÓN DE TUMBAS DE TIRO CON ÉNFASIS EN LA CULTURA BOLAÑOS (The Worldview of Western Mexico through the Shaft Tomb Tradition, with Emphasis on the Bolaños Culture

    Directory of Open Access Journals (Sweden)

    María Teresa Cabrero G.

    2016-06-01

    Full Text Available Se propone la presencia de deidades en las tumbas de tiro del Occidente de México a través de una primera interpretación iconográfica de las figurillas huecas depositadas como ofrenda, tanto en las tumbas en general como en las descubiertas en la cultura Bolaños, con base en una posible concepción distinta a la mesoamericana de la cosmovisión y cosmogonía de los creadores de esta tradición. ENGLISH: The presence of deities in Western Mexican shaft tombs is proposed through the first iconographic interpretation of hollow figurines deposited as offerings in the tombs, particularly those of the Bolaños culture. The creators of the shaft tomb tradition may have held a worldview and a cosmogony distinct from those of Mesoamerica.

  18. Composición, estructura y diversidad del cerro El Águila, Michoacán, México Composition, structure and diversity of the cerro El Águila, Michoacán, Mexico

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    Luis Eduardo Zacarias-Eslava

    2011-09-01

    Full Text Available Se describe la composición, estructura y diversidad de la vegetación presente en el cerro El Águila, Michoacán. Se reconocieron fisonómicamente 5 tipos de vegetación y en cada uno se establecieron 16 parcelas circulares de 400 m² (3.2 ha para censar los individuos leñosos ≥ 10 cm d.a.p., con una parcela anidada de 100 m² (0.8 ha para los individuos entre 2.5 y 9.9 cm d.a.p. El muestreo incluyó 46 especies agrupadas en 33 géneros y 21 familias. Los bosques tropical caducifolio y de Quercus deserticola tuvieron los valores más bajos de altura promedio ( 11 m y área basal (> 40 m²/ha. La diversidad fue mayor en el bosque tropical caducifolio (S=23 y α =5.4 y menor en el de Quercus-Pinus (S= 13 y α= 2.71. En general, los tipos de vegetación mostraron diferentes especies dominantes y una alta diversidad beta. La composición y estructura de estas comunidades puede asociarse a cambios en altitud y a la perturbación por actividades humanas. No obstante, la zona de estudio aún presenta áreas en buen estado de conservación, particularmente los bosques templados hacia las zonas con mayor altitud, por lo que se sugiere que en un futuro cercano sea incluida dentro de alguna categoría de protección estatal.This study describes composition, structure and diversity of vegetation in the Cerro El Águila, Michoacán. Five plant communities were recognized and for each one all woody individuals ≥10 cm DBH were tallied in sixteen 400 m² circular plots, whereas individuals between 2.5 and 9.9 cm DBH were measured in a 100 m² circular sub-plot centered within each larger plot. A total of 46 species, 33 genera and 21 families were recorded. The tropical deciduous forest and Quercus deserticola forest had low values of mean plant height ( 11 m and basal area (> 40 m²/ha. Diversity was greater in the tropical deciduous forest (S= 23 and α= 5.4, respectively and lower in the oak-pine forest (S= 13 and α= 2.71. All communities displayed

  19. Investigaciones bioarqueológicas en ambientes ecotonales del borde occidental de la provincia de Buenos Aires y sur de la provincia de Santa Fé

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    Ayuso, María P.

    2003-01-01

    Full Text Available A fines de la década del '80, se ha producido en nuestro país un sostenido desarrollo de los estudios bioarqueológicos orientados a obtener información relevante para discutir diversos aspectos del proceso evolutivo y adaptativo de las poblaciones prehistóricas. Los proyectos realizados y aquellos en desarrollo, presentan un marcado énfasis regional y consideran una amplia gama de indicadores biológicos referidos a aspectos tales como las pautas de salud, nutrición, dieta y actividad de poblaciones correspondientes a distintos períodos del Holoceno. En la Región Pampeana, los trabajos bioarqueológicos llevados a cabo hasta el presente, son escasas las consideraciones sobre el sector comprendido por el Borde Occidental de la Provincia de Buenos, e inexistentes en el Sur de la Provincia de Santa Fe. El presente trabajo está orientado a analizar desde una perspectiva Bioarqueológica, la interrelación entre los procesos bioculturales y paleoambientales en distintos ambientes ecotonales de la Pampa Húmeda. Específicamente se halla abocado al análisis comparativo de sectores con características ecológicas diferentes, ya que se trata de áreas de transición, factor que probablemente influyó en la toma de decisiones por parte de los grupos humanos que habitaron la región a través del tiempo. El objetivo general es estudiar la variabilidad en los modos de uso del espacio y adaptación biocultural por parte de los pobladores de ambientes ecotonales pampeanos. La particularidad ambiental del área de estudio y la variedad del registro bioarqueológico, permiten suponer que la información generada de este modo contribuirá a aumentar y complejizar el conocimiento acerca de los procesos que estructuran el registro arqueológico a distintas escalas espaciales y temporales como un paso necesario para la comprensión de la evolución y adaptación de las poblaciones humanas.

  20. Estratigrafía y petrología del sector noreste de sierra de Apas. Provincia del Chubut Stratigraphy and petrology of the Northeastern sector of Sierra de Apas. Chubut Province

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    M. Remesal

    2004-12-01

    Full Text Available La sierra de Apas, ubicada entre las provincias de Rio Negro y Chubut, forma parte del magmatismo de intraplaca emplazado durante el Paleogeno-Neógeno en el norte de la Patagonia extrandina. En el sector noreste se ha definido una estratigrafía integrada por: traquitas oscuras, flujos piroclásticos, traquitas claras, domos riolíticos y basaltos porfíricos y afíricos. Las traquitas oscuras, son relativamente más antiguas, tienen bajo porcentaje de fenocristales, y clasifican como traquitas- benmoreítas. Las traquitas claras son porfíricas, y clasifican como comenditas. Su ubicación estratigráfica es confirmada por una edad K/Ar de 19 ± 2 Ma. Los flujos piroclásticos son predominantemente vítreos, cubren a las traquitas oscuras y tienen composiciones traquiandesíticas. La petrografía y geoquímica establecen una estrecha relación con las traquitas claras. El único cuerpo dómico en el área es el cerro Colorado, cuya composición corresponde a una riolita peralcalina ó comendita; una edad K/Ar de 24 ± 1 Ma establece por primera vez su relación temporal. La unidad efusiva más joven corresponde a lavas basálticas, agrupadas en afíricas y porfíricas. Se propone designar a las primeras como basaltos olivínicos transicionales en tanto que los basaltos porfíricos se subdividen en basaltos olivínicos alcalinos y hawaiitas. Los datos estratigráficos y geoquímicos sugieren que la asociación volcánica estudiada es el resultado de al menos dos etapas evolutivas. Una de ellas incluye los basaltos, traquitas claras, flujos claros y comenditas que muestran un patrón de cristalización fraccionada. Las traquitas oscuras, más viejas, corresponderían a otro estadio evolutivo.The volcanic building of Sierra de Apas (located on the limit between the Rio Negro and Chubut provinces is part of the Paleogene-Neogene intraplate magmatism of the northern Extrandean Patagonia. This contribution is focused on the northeastern of the Sierra

  1. Actualización en el límite entre sierras Pampeanas occidentales y Precordillera Oriental, en la provincia de San Juan Updating the boundary between the western Pampean ranges and the eastern Precordillera, province of San Juan

    Directory of Open Access Journals (Sweden)

    Juvenal J. Zambrano

    2008-03-01

    Full Text Available En este trabajo se analiza el sistema de fallamiento existente en la depresión tectónica de Tulum, ubicada en la parte este y sur de la provincia de San Juan, en el oeste árido de Argentina. El límite entre los dos sistemas morfoestructurales, uno la Precordillera Oriental y el otro el Sistema Pampeano Occidental ha sido establecido en trabajos anteriores, a lo largo del sistema de fallamiento de Tulum, que cruza a la depresión diagonalmente en dirección NNE. No obstante la disponibilidad de nueva información de sondeos eléctricos verticales y de algunas perforaciones para búsqueda de agua subterránea, efectuados al sur y al oeste del cerro Valdivia, permite señalar que hacia el suroeste de este núcleo de basamento metamórfico limitado en ambos flancos por fallas, el límite Sistema Pampeano y Precordillera se aproxima al cordón montañoso de sierra Chica de Zonda, continuando al sur en el cerro Salinas. De allí al SSO existen, en superficie, indicaciones de que el sistema de fallamiento continúa hasta el Montecito, donde el sistema pampeano de fallas queda interrumpido por la gran falla con actividad cuaternaria que sirve de límite oriental a la sierra de Las Peñas. El contacto entre ambos sistemas forma el extremo sur de la Precordillera Oriental en subsuelo. Este conocimiento estructural permite no solo ser aplicado a la prospección de agua sino también a la de hidrocarburos en la región.An analysis is made of the fault system in the Tulum tectonic depression, situated in the southeastern part of the province of San Juan, which is in the arid western part of Argentina. The boundary of two morphostructural systems occurs in this valley: the eastern Andean Precordillera and the western Pampean ranges. In former studies it was found that this boundary runs along a fault system that crosses the Tulum depression with a NNE trends. The availability of new information from electric resistivity tests and wells drilled for ground

  2. Mineralogy of the silica-epidote mineralized zone (SEMZ) in the Cerro Prieto geothermal reservoir, B.C., Mexico; Mineralogia de la zona mineralizada de silice-epidota (ZMSE) del yacimiento geotermico de Cerro Prieto, B.C., Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Izquierdo, Georgina; Aragon, Alfonso; Portugal, Enrique; Arellano; Victor M [Instituto de Investigaciones Electricas, Gerencia de Geotermia, Cuernavaca, Morelos (Mexico)]. E-mail: gim@iie.org.mx; Leon, Jesus de; Alvarez, Julio [Comision Federal de Electricidad, B.C. (Mexico)

    2006-07-15

    The distribution of hydrothermal minerals, mineral assemblages and fluid inclusion data were taken from drill cuttings from the production zone of wells all over the Cerro Prieto geothermal field. The production zone has been termed the silica-epidote mineralized zone (SEMZ), and is located in the deep part of the gray shale where thick layers of sandstone are found. Common mineral assemblages show three temperature ranges in the SEMZ: <200 degrees Celsius, 200-250 degrees Celsius and 250-300 degrees Celsius. The first range is characterized by clays, calcite and quartz; the second by quartz, epidote, chlorite and mica, and the third by epidote, amphibole, illite and chlorite. The study of fluid inclusions in authigenic grain quartz has shown two-phase fluid inclusions (liquid + vapor) of different salinities. A wide range exists of homogenization temperatures (Th) and for some wells there is a good agreement between Th and direct temperature measurements. [Spanish] Se determino la distribucion de minerales hidrotermales y las asociaciones parageneticas y se realizo el estudio microtermometrico de inclusiones fluidas a partir de recortes de perforacion de pozos de las distintas areas del campo geotermico de Cerro Prieto. Las muestras de recortes y nucleos de perforacion estudiados provienen de la zona de produccion a la que se le ha denominado Zona Mineralizada de Silice-Epidota (ZMSE), que se encuentra en la parte profunda de la lutita gris con importantes horizontes de areniscas. En esta zona las asociaciones parageneticas mas comunes han mostrado tres intervalos de temperatura para la ZMSE: <200 degrees Celsius, 200-250 degrees Celsius, 250-300 degrees Celsius. El primer intervalo esta caracterizado principalmente por arcillas, calcita y cuarzo; el segundo por cuarzo, epidota, clorita y micas, y el tercero por epidota, anfiboles, illita y clorita. El estudio de inclusiones fluidas en fragmentos de cuarzo autigenico mostro la presencia de inclusiones de dos fases

  3. Studies for recovering injection capacity in wells of the Cerro Prieto, BC, geothermal field; Estudios para recuperar la capacidad de aceptacion en pozos inyectores del campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez Rosales, Julio [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Residencia General de Cerro Prieto, Mexicali, Baja California (Mexico)]. E-mail: julio.alvarez@cfe.gob.mx

    2010-01-15

    As in geothermal fields around the world, at Cerro Prieto geothermal field, Baja California, former exploratory and production wells are used to inject residual brine. Since the 1980s, studies and activities have been carried out to find ways to recharge the reservoir and dispose of brine without harming the environment or underground aquifers. These include infiltration and cold-and-hot injection. Some of the studies are presented here, including analyses of litho-facies; core samples; pressure, temperature and spinner logs; well tests and injection rates-plus some studies on the shallow aquifer. All have been useful in fulfilling requirements made by environmental authorities. Because injection rates constantly decrease due to formation damage, it is proposed an additional technique be used to reduce such damages and prolong the lifetime of cold-and-hot injection wells-while ensuring the environment and shallow aquifers are not affected. [Spanish] Al igual que en diversos campos geotermicos en el mundo, en el de Cerro Prieto, Baja California se han utilizado tanto pozos inyectores perforados ex profeso como antiguos pozos exploratorios y productores para inyectar el fluido residual al subsuelo. Desde la decada de los 80 se han realizado diversos estudios y acciones en ese campo geotermico para recargar al yacimiento y para disponer del fluido residual, sin ocasionar danos al ambiente ni a los cuerpos hidricos del subsuelo, que van desde la infiltracion hasta la inyeccion en frio y en caliente. Este articulo presenta los diferentes estudios realizados con ese objetivo en el campo, incluyendo el analisis de litofacies, de nucleos de formacion, de registros de presion, temperatura y spinner, las pruebas en pozos y analisis de tasas de aceptacion, asi como los efectuados en el acuifero superficial. Todos ellos han sido de utilidad para atender los requerimientos de las autoridades ambientales. Finalmente, y en virtud de que las tasas de aceptacion de los pozos

  4. Geological and production analyses focused on exploration of the eastern part of the Cerro Prieto geothermal field, BC; Analisis geologico-productivo enfocado a la exploracion de la parte oriental del campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar Dumas, Alvaro [Comision Federal de Electricidad, Residencia General de Cerro Prieto, B.C (Mexico)]. E-mail: alvaro.aguilar@cfe.gob.mx

    2008-01-15

    The eastern part of the Cerro Prieto geothermal field (CGCP), known as Poligono Nuevo Leon, is an area with proven geothermal resources, as confirmed by seven directional wells located toward the east and by vertical well M-200 located inside the polygon. Well M-200 was drilled in 1984 and has produced about 4 million tons of steam to date. It is integrated into the CP-2 sector, producing 68 t/h of steam. Presently the eastern part of CGCP, representing 25% of the total field area, is producing over half of the steam for the entire field. In the last few years, the steam has come only after increasing the number of production wells located in the eastern zone of CGCP (Rodriguez, 2006), where pressure, enthalpy and temperature conditions are better than in other parts of the field. However in the long term it will be necessary to incorporate Poligono Nuevo Leon into the productive area to expand the productive life of CGCP. This paper includes a geological analysis, plus models for steam production, temperature and enthalpy for Poligono Nuevo Leon. [Spanish] La parte oriental del Campo Geotermico de Cerro Prieto (CGCP), conocida como Poligono Nuevo Leon, representa una area potencial con recursos geotermicos comprobados, lo que demuestran siete pozos direccionales que se han perforado hacia el este, asi como el pozo vertical M-200, localizado dentro del poligono. El pozo M-200 se perforo en 1984 y ha producido a la fecha alrededor de 4 millones de toneladas de vapor, estando integrado al sector CP-2 una produccion de 68 t/h de vapor. Actualmente la parte oriental del CGCP, que representa el 25% del area total del campo, produce mas de la mitad del total de vapor del campo. El suministro de vapor en los ultimos anos se ha logrado cubrir aumentando el numero de pozos en operacion localizados en la zona oriente del CGCP (Rodriguez, 2006), ya que es aqui donde hay condiciones de presion, entalpia y temperatura del yacimiento que son mejores que en otras areas del campo

  5. Two-phase characteristics of the feeding fluid of Cerro Prieto IV wells (Mexico) obtained by gas equilibrium; Caracteristicas bifasicas del fluido de alimentacion de pozos de Cerro Prieto IV (Mexico), obtenidas por equilibrio gaseoso

    Energy Technology Data Exchange (ETDEWEB)

    Barragan-Reyes, Rosa Maria; Arellano-Gomez, Victor Manuel; Portugal-Marin, Enrique [Instituto de Investigaciones Electricas (Mexico); De Leon-Vivar, Jesus [Comision Federal de Electricidad, Residencia General de Cerro Prieto, B.C (Mexico)

    2008-10-15

    The gas composition of fluids produced by CP IV geothermal wells from the Cerro Prieto field was studied in order to identify different types of fluids entering the wells by estimating their temperature and excess steam. A method based on the Fischer Tropsch reaction and H2S equilibrium with pyrite-pyrrhotite as mineral buffer (FTHSH3) was used. The results for the reservoir natural state indicated the presence of fluids with heterogeneous reservoir temperature (between 275 and 310 degrees Celsius) and excess steam values, which were found from negative (boiled liquid that has lost steam when flowing to the well) to one (steam phase with zero liquid saturation). The study for individual wells in which boiling processes were identified, showed that through time, the feeding fluids consist of a two-phase mixture with different liquid/steam proportions. Also, the results suggested that a steam phase could occur at CP IV which is added to the feeding fluid, depending on the operation conditions of the wells. The origin of this steam could be the boiling of the deeper liquid due to a pressure drop. [Spanish] Se estudio la composicion gaseosa de los fluidos producidos por pozos geotermicos del sector CP IV del campo de Cerro Prieto para tratar de distinguir aportes de fluidos diferentes mediante la estimacion de su temperatura de yacimiento y del exceso de vapor. Se utilizo un metodo de equilibrio gaseoso basado en la reaccion de Fischer Tropsch y el equilibrio combinado pirita-pirrotita (FT-HSH3). Los resultados obtenidos indican que en el estado inicial del yacimiento existen fluidos que muestran heterogeneidad en los valores de temperatura de yacimiento (entre 275 y 310 grados Celsius), asi como en el exceso de vapor con valores desde negativos (liquido que despues de ebullir ha perdido vapor en su trayecto hacia el pozo) hasta uno (vapor con cero saturacion de liquido). El estudio individual de los pozos con fenomenos de ebullicion muestra que a traves del tiempo

  6. Cerro Grande Fire Impact to Water Quality and Stream Flow near Los Alamos National Laboratory: Results of Four Years of Monitoring

    Energy Technology Data Exchange (ETDEWEB)

    B.M. Gallaher; R.J. Koch

    2004-09-15

    In May 2000, the Cerro Grande fire burned about 7400 acres of mixed conifer forest on the Los Alamos National Laboratory (LANL), and much of the 10,000 acres of mountainside draining onto LANL was severely burned. The resulting burned landscapes raised concerns of increased storm runoff and transport of contaminants by runoff in the canyons traversing LANL. The first storms after the fire produced runoff peaks that were more than 200 times greater than prefire levels. Total runoff volume for the year 2000 increased 50% over prefire years, despite a decline in total precipitation of 13% below normal and a general decrease in the number of monsoonal thunderstorms. The majority of runoff in 2000 occurred in the canyons at LANL south of Pueblo Canyon (70%), where the highest runoff volume occurred in Water Canyon and the peak discharge occurred in Pajarito Canyon. This report describes the observed effects of the Cerro Grande fire and related environmental impacts to watersheds at and near Los Alamos National Laboratory (LANL) for the first four runoff seasons after the fire, from 2000 through 2003. Spatial and temporal trends in radiological and chemical constituents that were identified as being associated with the Cerro Grande fire and those that were identified as being associated with historic LANL discharges are evaluated with regard to impacts to the Rio Grande and area reservoirs downstream of LANL. The results of environmental sampling performed by LANL, the New Mexico Environment Department (NMED), and U.S. Geological Survey (USGS) after the Cerro Grande fire are included in the evaluation. Effects are described for storm runoff, baseflow, stream sediments, and area regional reservoir sediment.

  7. Pucarilla-Cerro Tipillas volcanic complex: the oldest recognized caldera in the southeastern portion of central volcanic zone of Central Andes?

    Energy Technology Data Exchange (ETDEWEB)

    Guzman, Silvina; Petrinovic, Ivan [CONICET -IBIGEO. Museo de Cs. Naturales, Universidad de Salta, Mendoza 2 (4400), Salta (Argentina)], E-mail: guzmansilvina@gmail.com

    2008-10-01

    We recognize the most eastern and oldest collapse caldera structure in the southern portion of the Central Volcanic Zone of the Andes. A description of Middle-Upper Miocene successions related to explosive- effusive events is presented. The location of this centre close to Cerro Galn Caldera attests a recurrence in the volcanism between 12 and 2 Ma in this portion of the Altiplano - Puna Plateau.

  8. Evaluación integral del riesgo volcánico del Cerro Machín, Colombia

    Directory of Open Access Journals (Sweden)

    Leonel Vega Mora

    2013-01-01

    Full Text Available El volcán Cerro Machín (VCM se encuentra situado en la Cordillera Central de Colombia. Por la com- posición química, magnitud y extensión de sus erupciones pasadas, se reconoce como un volcán explosivo de gran potencial de daño, cuya actividad futura podría afectar intensamente durante mucho tiempo (meses hasta años una región muy estratégica para la economía del país, que cubre áreas pertenecientes a los departamentos de Tolima, Quindío, Valle del Cauca y Cundinamarca, en las cuales habitan cerca de un millón de personas. En este artículo se muestra la metodología y resultados del estudio de “Evaluación Integral del Riesgo del Cerro Machín – Colombia”, realizado durante 2009 por el Grupo PIGA de Investigación en Política, Información y Gestión Ambiental de la Facultad de Ingeniería de la Universidad Nacional de Colombia, tomando como punto de partida el estudio de “Evaluación de la Amenaza Volcánica Potencial del Cerro Machín” adelantado en el 2002 por el Servicio Geológico Colombiano (SGC. En consecuencia, se genera y ajusta una nueva ecuación para la determinación del riesgo, basada en la valoración de índices de amenaza intrínseca e índices de vulnerabilidad, los primeros en función del grado de intensidad, duración, extensión y acumulación de las amenazas, y los segundos, en función del grado de exposición espacial y temporal de los elementos (sociales, económicos, institucionales y ecosisté- micos y de su capacidad de respuesta intrínseca y extrínseca ante las amenazas. Con estas ecuaciones y mediante el uso de sistemas de información geográfica (SIG, se realiza para cada escenario de análisis considerando la modelación geoespacial del riesgo a nivel de cada pixel cartográfico del área territorial de estudio. En esta modelación se integra toda la informa- ción territorial del área en estudio, lo que permite obtener, de acuerdo con el marco lógico de evaluación preestablecido

  9. Seismic activity at the Cerro Prieto Geothermal Area (Mexico) from August 1994 to December 1995, and its relationship with tectonics and fluid exploitation

    Science.gov (United States)

    Fabriol, H.; Munguía, L.

    A continuous monitoring of the Cerro Prieto geothermal field was carried out from August 1994 to December 1995 to investigate the seismicity of tectonic origin and the seismicity triggered by exploitation activities. Hypocenters for 148 events were located mainly around the northern end of the Cerro Prieto fault and within the geothermal zone. The estimated focal depths range mostly from 1 to 6 km, for earthquakes with magnitudes from 0.5 to 4.6. It was difficult to distinguish between natural and triggered seismicity. We observed a single case of an earthquake for which a correlation in time and space seems plausible with a sharp increase of fluid injection in a well located at less than 1 km from the epicenter. Fault plane solutions of 26 events with magnitudes between 2.8 and 4.6 indicate right-lateral strike-slip motion for earthquakes that occur near the Cerro Prieto and Imperial faults. Inside the geothermal zone, events with normal components of motion were recorded, as expected from the extensional stress regime of the pull-apart basin laying between both faults.

  10. Chemical variations in the Cerro de Mercado (Durango, Mexico) fluorapatite: Assessing the effect of heterogeneity on a geochronologic standard.

    Science.gov (United States)

    Boyce, J. W.; Hodges, K. V.

    2001-12-01

    Despite the lack of an official pronouncement, the fluorapatite of Cerro de Mercado, Durango, Mexico has become the de facto standard for (U-Th)/He geochronology. In addition to being relatively inclusion-free and easily obtained, these crystals are commonly in excess of 5mm in diameter, permitting the removal of the outer skin of the crystal, theoretically eliminating the alpha-ejection correction. However, bulk analyses of the Durango fluorapatite indicate a substantial variation in U and Th concentrations from aliquot to aliquot (167-238 ppm Th; 9.7-12.3 ppm U, [1]). If similar variations were to occur on the sub-grain scale, small fragments of single crystals could contain helium excesses or deficiencies due to alpha-ejection exchange between zones with varying parent element content. We have performed a series of experiments to quantify the intra-grain variation in U and Th, in order to model the effect of this variation on ages determined on Durango fluorapatite. X-ray maps show concentric zonation in U and Th, with similar, but more apparently pronounced zonation in Si and Cl. Preliminary laser-ablation ICPMS data indicate, not surprisingly, that intra-grain variations in U and Th concentrations obtained by analysis of ~35 μ m spots are larger than that which had been previously obtained by bulk analytical techniques (with overall concentrations greater than for bulk analyses). Thus far, analyses yield U concentrations varying from 11 to 16 ppm, and Th concentrations ranging from 220 to 340 ppm. Modeling underway suggests that parent element variations on the order of 50%, such as those observed, and the resulting differential alpha-exchange could lead to several percent error in age, for ~100 μ m fragments. The effect scales inversely with fragment size, with 300 μ m fragments (roughly the size of a large, single grain analysis) having only ~1% error. This may offer an explanation for the previously observed inability to reproduce ages for the Durango

  11. Geographic Information System (GIS) Emergency Support for the May 2000 Cerro Grande Wildfire, Los Alamos, New Mexico, USA

    Energy Technology Data Exchange (ETDEWEB)

    C.R.Mynard; G.N.Keating; P.M.Rich; D.R. Bleakly

    2003-05-01

    In May 2000 the Cerro Grande wildfire swept through Los Alamos, New Mexico, burning approximately 17,400 ha (43,000 acres) and causing evacuation of Los Alamos National Laboratory (LANL) and the communities of Los Alamos and White Rock. An integral part of emergency response during the fire was the use of geographic information system (GIS) technology, which continues to be used in support of post-fire restoration and environmental monitoring. During the fire Laboratory GIS staff and volunteers from other organizations worked to produce maps and provide support for emergency managers, including at an emergency GIS facility in Santa Fe. Subsequent to the fire, Laboratory GIS teams supported the multiagency Burned Area Emergency Rehabilitation (BAER) team to provide GIS data and maps for planning mitigation efforts. The GIS teams continue to help researchers, operations personnel, and managers deal with the tremendous changes caused by the fire. Much of the work is under the auspices of the Cerro Grande Rehabilitation Project (CGRP) to promote recovery from fire damage, improve information exchange, enhance emergency management, and conduct mitigation activities. GIS efforts during the fire provided important lessons about institutional matters, working relationships, and emergency preparedness. These lessons include the importance of (1) an integrated framework for assessing natural and human hazards in a landscape context; (2) a strong GIS capability for emergency response; (3) coordinated emergency plans for GIS operations; (4) a method for employees to report their whereabouts and receive authoritative information during an evacuation; (5) GIS data that are complete, backed-up, and available during an emergency; (6) adaptation of GIS to the circumstances of the emergency; (7) better coordination in the GIS community; (8) better integration of GIS into LANL operations; and (9) a central data warehouse for data and metadata. These lessons are important for planning

  12. Incidencia de cateterismo umbilical en la provincia. holguin (2004 - 2007: 1ª parte

    Directory of Open Access Journals (Sweden)

    Odalys Leyva González

    2008-01-01

    Full Text Available Aborda el uso casi generalizado del cateterismo umbilical en neonatos graves, lo que hace que Cuba alcance la tasa mas alta de morbilidad por Hipertensión Portal pre-hepática pediátrica en el mundo, secundaria a la trombosis venosa portal post-cateterismo. Se realiza un estudio epidemiológico para conocer el número de neonatos que han requerido cateterismo umbilical como base a la implantación del programa de pesquizaje y diagnóstico precoz que permita la caracterización de la población afectada. Se hace un estudio descriptivo, revisando registros epidemiológicos de unidades de neonatología de la provincia. Un total de 666 pacientes en los tres años de estudio requirieron cateterismo umbilical, siendo la principal causa hipoxia al nacer.

  13. Refugiados y evacuados de la provincia de Toledo al comienzo de la guerra civil (1936

    Directory of Open Access Journals (Sweden)

    Juan Carlos Collado

    2009-01-01

    Full Text Available Desde el comienzo de la guerra civil tuvieron lugar movimientos forzosos de población al compás del avance de los frentes. Como ya sucedió en Andalucía y Extremadura, las sucesivas derrotas del ejército republicano en las comarcas septentrionales de la provincia de Toledo provocaron de nuevo desplazamientos masivos de población con Madrid como destino principal. Empezaba el drama de los refugiados.From the begining of the civil war, forced movements of populations took place witnessing the avance of the army detachments. As it already happened in Andalucia and Extremadura, the successive defeats suffered by the recuplican army in the northern regions of the province of Toledo caused other mass movements of civilians towards Madrid as the main destination. It was just the beggining of the refugees tragedy.

  14. El fenómeno de la prostitución en la provincia de Palencia

    OpenAIRE

    García Calleja, Rebeca

    2015-01-01

    Este trabajo pretende ser un acercamiento a la realidad sobre el fenómeno de la prostitución y la trata de seres humanos con fines de explotación sexual en la provincia de Palencia. En una primera parte, se presenta el marco teórico en relación con el fenómeno de la prostitución y la trata de seres humanos con fines de explotación sexual, asi como los modelos legislativos existentes sobre el fenómeno de la prostitución y la perspectiva político – legal adoptada por España. Y, en la segund...

  15. LA RESILIENCIA DE LOS EMPRESARIOS EN EL SECTOR FORESTO INDUSTRIAL DE LA PROVINCIA DE MISIONES

    Directory of Open Access Journals (Sweden)

    Nilda, Tañski

    2010-12-01

    Full Text Available Como parte del resultado de un trabajo de investigación denominado La gestiónasociativa entre PyMEs (Pequeñas y Medianas Empresas en el sector de la Foresto-industria yactividades relacionadas, en la Provincia de Misiones, se efectúa el presente estudio. Seanalizan los discursos de los empresarios de un grupo de Pymes del sector de la Forestoindustria,para verificar la existencia o no de comportamientos resilientes e identificar lascaracterísticas de dichos comportamientos o los estilos de enfrentamientos a las adversidadespor parte de los mismos. Se describen las adversidades contextuales por las que atraviesan yse detectan los factores resilientes como acciones efectuadas en las distintas situaciones.

  16. Salud y enfermedad en Tunja y su Provincia durante el período colonial

    Directory of Open Access Journals (Sweden)

    Ernesto Porras Collantes

    2010-08-01

    Full Text Available La salud pública es provincia del bienestar social, de la asistencia pública, que las modernas sociedades han integrado a la planificación urbana. Las condiciones físicas del sitio en que Tunja fue fundada, empero, entrabaron la planificación urbana colonial de la urbe y fueron óbice insalvable que conspiró contra su sanidad pública. En efecto, las necesidades tácticas de la guerra de conquista fueron causa determinante para que se fundara a Tunja en un sitio por demás inconveniente para una ciudad, como apropiado para un castro militar. 

  17. El municipio y la provincia en la Constitución de 1812

    OpenAIRE

    García Fernández, Javier

    2012-01-01

    El modelo local establecido por la Constitución de Cádiz de 1812 comportó un cambio revolucionario que resquebrajó la organización administrativa del Antiguo Régimen, insertando los órganos de gobierno del municipio y de la provincia en la estructura del Estado. La Constitución gaditana alteró la base social y política de España que gravitaba sobre unas entidades locales que estaban liberándose del feudalismo, y reguló profusamente el régimen local. Después de su aprobación, las Cortes Genera...

  18. Hallazgo de sepiolita en Serpentinitas, Mina árbol seco, provincia de Córdoba

    Directory of Open Access Journals (Sweden)

    Leticia Lescano

    2012-12-01

    Full Text Available La sepiolita es un mineral utilizado en numerosos productos comerciales e industriales generalmente relacionados con aplicaciones de absorción de moléculas orgánicas. Este mineral, por su hábito fibroso, fue utilizado como un sustituto del asbesto. Presenta una estructura tridimensional en fibras que origina una alternancia de "listones" y canales denominados zeolíticos donde pueden alojarse cationes, agua y compuestos orgánicos. En la Argentina, ha sido descripta por diversos autores como una alteración de rocas carbonáticas. En este trabajo se caracterizó una sepiolita localizada en el sector oeste de la mina Árbol Seco, departamento Calamuchita, provincia de Córdoba, desarrollada en fracturas dentro de cuerpos serpentiníticos.

  19. la mitad sur de la provincia de A Coruña

    Directory of Open Access Journals (Sweden)

    José Antonio Aldrey Vázquez

    2005-01-01

    Full Text Available En este artículo se realiza una aproximación a las potencialidades y problemas que presenta el uso de fuentes a escala microespacial para el análisis demográfico en base a la propia experiencia de investigación del autor en su tesis doctoral. En este sentido, se hace un repaso al proceso que se ha seguido para la obtención y aplicación de este tipo de datos para localizar patrones demográficos en Galicia y definir su lógica territorial, aspecto que se ha logrado a través del análisis de casos seleccionados en la mitad sur de la provincia de A Coruña.

  20. Mapa de Potencial Eólico de la provincia Holguín

    Directory of Open Access Journals (Sweden)

    Jorge Proenza Velázquez

    2007-01-01

    Full Text Available En este trabajo, se aplican el modelo de microescala WasP 8.2 y el sistema de información geográfica ArcView 3.0 para obtener el mapa de d ensidad de potencia media anual del flujo de energía a 50 m de altura de la provincia Holguín, donde se representan las principales zonas geográficas del territorio con potenciales eólicos óptimos para la utilización del viento en la producción de energía eléctrica mediante la instalación de turbinas eólicas o aerogeneradores.

  1. PRESENCIA DE LA CERÁMICA SEUDO-CLOISONNÉ EN LA CULTURA BOLAÑOS, JALISCO Y ZACATECAS (Presence of the Pseudo-cloisonné Pottery in the Bolaños Culture, Jalisco and Zacatecas

    Directory of Open Access Journals (Sweden)

    María Teresa Cabrero G.

    2012-12-01

    Full Text Available La cerámica seudo-cloisonné tuvo una amplia distribución en el mundo prehispánico mexicano a partir de 200 d. C. Se denominó así por la semejanza en la técnica decorativa con el verdadero cloisonné elaborado sobre metal. La presencia de esta técnica poscocción en la cultura Bolaños, ubicada en parte de los estados de Jalisco y Zacatecas, constituyó una prueba más del contacto comercial que existió con la cultura Chalchihuites (noroeste de Zacatecas; a la cual le llegó a través de la ruta de intercambio comercial que partía desde Teotihuacan hacia el norte, en búsqueda de la preciada turquesa cuyos yacimientos se encuentran en Nuevo México. La decoración de las vasijas empleando esta técnica demostró la presencia de artesanos especialistas dentro de una sociedad con un avanzado desarrollo; los motivos señalan la ideología de sus creadores al plasmar representaciones de la fauna, la flora y personajes distinguidos dentro de la sociedad. ENGLISH: The pseudo-cloisonné pottery was widely distributed among the prehispanic world in Mexico from 200 AD. These objects are described as pseudo-cloisonné because of similarities to the decorative technique employed by the true cloisonné made of metal. The presence of this technique post-firing in the Bolaños culture, which is located among the states of Jalisco and Zacatecas, is further evidence of the commercial contact that took place with the Chalchihuites culture (Northeast Zacatecas. These objects arrived to Chalchihuites through the commercial exchange that began in Teotihuacan and traveled northward in search of the valuable turquoise mines located in New Mexico. The decoration on these objects using this technique shows evidence of the existence of highly skilled people specialized in this technique among this society. The decoration in general represents the ideology of the craftsmen when they embedded the features of nature as well as distinctive people among their

  2. Velocidade da bola no chute no futsal: comparação entre garotos com diferentes níveis de desempenho e correlação de variáveis preditoras do desempenho

    Directory of Open Access Journals (Sweden)

    Vitor Luiz de ANDRADE

    2015-09-01

    Full Text Available ResumoO estudo objetivou comparar e verificar as possíveis correlações entre a velocidade da bola com a velocidade do pé, ângulo relativo do joelho e comprimento do último passo durante o chute entre garotos Praticantes e Não Praticantes do futsal. Participaram do estudo 14 garotos com idade entre 13 e 15 anos divididos em dois grupos, Praticantes (G1 e Não Praticantes (G2 de acordo com seu tempo de prática estruturada semanal na modalidade. Para a análise cinemática duas câmeras ajustadas a uma frequência de 120 Hz, foram fixadas lateralmente ao movimento realizado e focalizando os marcadores fixados no membro inferior do chute. Cada participante executou 10 chutes simulando uma cobrança de tiro livre no futsal. Os dados tridimensionais do membro inferior de chute foram obtidos pelo "software" DVIDEOW e tratados em ambiente Matlab, para obtenção das variáveis cinemáticas de interesse: velocidade da bola (VELBOLA, velocidade do pé (VELPÉ, ângulo de joelho (ANGJOELHO e comprimento do último passo (CP. Todas as variáveis exibiram índices estatisticamente maiores em G1 se comparado a G2 e, além disso, não foram encontradas diferenças intertentativas na tarefa (p < 0,05. No G1 uma análise de regressão múltipla somente revelou influência na VELBOLA em 17% causada pelo CP. Além disso, no G2 nenhuma variável influenciou na VELBOLA. Pode-se concluir que as variáveis estudadas são diferentes entre praticantes e não praticantes de futsal com idade entre 13 - 15, e que a VELBOLA pode ser ligeiramente influenciada pelo CP nesta faixa etária. Recomenda-se que treinadores monitorem periodicamente o desenvolvimento desta característica do movimento, principalmente em jogadores novatos, como forma de identificar jogadores com diferentes níveis de desempenho no chute em um contexto de futsal.

  3. Subdivisión litofacial e interpretación del volcanismo jurásico (Grupo Bahía Laura en el este del Macizo del Deseado, provincia de Santa Cruz Litofacial subdivision and interpretation of the Jurassic volcanism (Bahía Laura Group in the eastern Deseado Massif, Santa Cruz province

    Directory of Open Access Journals (Sweden)

    D.M. Guido

    2004-12-01

    Full Text Available El Grupo Bahía Laura representa la unidad de mayor importancia de la provincia geológica Macizo del Deseado. Está constituido por un conjunto de rocas volcánicas ácidas de edad Jurásico medio a superior, que se distribuyen ampliamente en la provincia. El presente artículo describe la subdivisión litofacial del grupo surgida de los trabajos de mapeo en el sector oriental del Macizo del Deseado. Este criterio condujo a una clasificación en facies y subfacies volcánicas desde un punto de vista descriptivo y genético. De este modo, se han determinado la facies volcaniclástica que comprende las subfacies piroclástica (de flujo, caída y surge y la subfacies epiclástica, y la facies efusiva, que incluye las subfacies lávica y subvolcánica. Esta discriminación posibilitó la interpretación de los procesos que han actuado en la conformación de los depósitos volcánicos del sector estudiado, favoreciendo además la utilización del término "Complejo Bahía Laura". El volcanismo ácido jurásico de la región oriental se asocia a un ciclo mayor explosivo-efusivo. En un principio se generaron alta proporción de depósitos de caída, posteriormente se originaron grandes volúmenes de ignimbritas, principalmente de alto grado, y la etapa final fue dominada por materiales lávicos y depósitos volcánicos retrabajados. Se identificaron además los principales centros de emisión (la caldera del cerro Torta y varios complejos de domos, domos, pórfiros y diques de los materiales volcánicos en el área. Su distribución se ajusta a lineamientos ENE y NNO, poniendo en evidencia la importancia del mecanismo de erupción fisural, asociado a las fracturas extensionales del sistema El Tranquilo, en la extrusión de los materiales volcánicos.The Bahía Laura Group represents the most important unit of the Deseado Massif geological province. It is composed by acid volcanic rocks of upper to middle Jurassic age, which are widely distributed in

  4. Mortalidad en la población galesa de Gaiman, provincia de Chubut, Argentina

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    Caratini, Alicia Liliana

    2005-01-01

    Full Text Available El objetivo de este trabajo es analizar la evolución en el tiempo de las defunciones y de las causas de muerte por edad y sexo de la población galesa de Gaiman, provincia de Chubut, Argentina. Los datos fueron obtenidos de las Actas de Defunción del Archivo del Registro Civil de la ciudad de Rawson, Chubut. El período de estudio se extendió de 1892 a 1961 y para su descripción y análisis se lo dividió en decenios. Se registraron 2103 defunciones de las cuales 1039 (49% correspondieron a galeses y sus descendientes, lo cual representa un promedio de 14.6 muertes por año. Se detectó una sobremortalidad masculina (59%, esperable en una población colonizadora con predominio de varones. Se observó un incremento, en el tiempo, de la edad media de defunción, lo que indica mejoras en las condiciones socioeconómicas y de salud de la población. La mortalidad infantil y los natimortos representaron el 20% y el 11%, respectivamente, de las defunciones y se constató una transición desde una mortalidad provocada por enfermedades de naturaleza exógena a otra de causalidad endógena. Al compararse nuestros datos con los de la provincia de Chubut y el país, se comprobó, en todos los casos, un descenso de la mortalidad en el tiempo, aunque en Gaiman esa disminución fue más significativa, probablemente por la atención que la comunidad le dedicaba a la educación y a la salud.

  5. Valutazione epidemiologica dello screening mammografico 'Per te donna' nell'ASL della provincia di Varese

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    S. Pisani

    2003-05-01

    Full Text Available

    Nel corso del 2000 è stato avviato, nell’ASL della Provincia di Varese, lo screening mammografico per tutte le donne residenti, di età compresa tra i 50 - 69 anni. In questo lavoro si valuta sinteticamente l’andamento dello screening dal 1° di gennaio 2001 fino al 31 dicembre 2002.
    L’avvio dello screening è stato graduale, iniziando con alcuni comuni della Provincia, fino ad arrivare al coinvolgimento di tutti i 141 comuni.
    La popolazione bersaglio è risultata essere di 109.607 donne. Nel primo anno sono state invitate 35.161 donne, nel secondo 49.709, con un aumento degli inviti pari al 41,4%.

    La popolazione rispondente, nel corso del 2001, è stata di 12.992 donne, nel 2002 di 22.590 donne, con un aumento della risposta pari al 73,9 %.
    L’adesione corretta al programma di screening è passata
    dal 41,2 % nel 2001 al 54,7 % nel 2002 e il tasso di identificazione (Detection Rate dal 4,8 ‰ al 5,3 ‰.

    Sta per iniziare il secondo round del programma di screening. In previsione di questa fase, sulla base dell’esperienza maturata nel primo round, dovranno essere aggiornati le linee guida, il piano di fattibilità e implementato il sistema di controllo di qualità di tutte le componenti del programma (ruolo di gestione e di coordinamento dell’ASL, esecuzione delle prestazioni da parte degli enti erogatori, flussi informativi, comunicazione e formazione di tutto il personale dedicato.

  6. EMPLEO DEL PROGRAMA VOLCFLOW PARA SIMULAR FLUJOS PIROCLÁSTICOS DEL VOLCÁN CERRO MACHÍN, TOLIMA, COLOMBIA

    Directory of Open Access Journals (Sweden)

    Elsa Adriana Cárdenas Quiroga

    2013-01-01

    Full Text Available Se presentan los resultados de simular futuros flujos piroclásticos que podría producir el Volcán Cerro Machín, ubicado en la Cordillera Central de Colombia. Esta simulación se realizó con el programa VolcFlow desarrollado por el Laboratorio de Magmas y Volcanes de la Universidad Blaise Pascal, Francia, diseñado especialmente para modelar el comportamiento de este tipo de productos volcánicos, ya que está basado en las características reológicas de esos flujos. Se comparan las áreas que serían potencialmente afectadas por una erupción de ese tipo y los espesores del material que se depositaría con resultados obtenidos de simulaciones realizadas con un Model Builder desarrollado en ARC GIS por el Grupo de Investigación Geomática Aplicada de la Universidad Militar Nueva Granada en Colombia, obteniéndose resultados similares.

  7. A preliminary interpretation of gas composition in the CP IV sector wells, Cerro Prieto geothermal field, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Barragan Reyes, Rosa Maria; Arellano Gomez, Victor M; Portugal Marin, Enrique [Instituto de Investigaciones Electricas, Gerencia de Geotermia, Morelos (Mexico)]. E-mail: rmb@iie.org.mx; Perez Hernandez, Alfredo; Rodriguez Rodriguez, Marco Helio; Leon Vivar, Jesus de [Comision Federal de Electricidad, Residencia General Cerro Prieto, B.C. (Mexico)

    2007-07-15

    To increase the electrical generation capacity of the Cerro Prieto geothermal field from 620 MW to 720 MW, the Cerro Prieto IV (CP IV) sector of the field was developed in the NE portion of the exploited field. Fourteen new wells have been drilled there since 2000. The wells in CP IV zone produce two-phase fluids at wellhead with heterogeneous steam fraction characteristics: at the central zone and towards the NW, the wells are liquid-dominated while those towards the E and S produce a relatively high steam fraction. This work studies the gas compositions of produced fluids to obtain reservoir parameters such as temperature and steam fraction and identify different sources of fluids in the wells. A method was used based on the Fischer Tropsch reaction and H{sub 2}S equilibria with pyrite-pyrrhotite as a mineral buffer (FT-HSH3). The results for the natural state showed the presence of fluids with reservoir temperatures from 275 to 310 degrees Celsius and excess steam values from -1 to 50%. Data are aligned in a FT-HSH3 trend, suggesting that the well discharges consist of a mixture in different proportions of the two end members. One seems to be a liquid with a temperature of over 300 degrees Celsius with negative or negligible excess steam. The other seems to be a two-phase fluid with a temperature of about 275 degrees Celsius and an excess steam fraction of about 0.5. According to the data for single wells and depending on the production conditions of the wells, reservoir fluid mixtures could occur in different proportions of liquid and steam. Data for 2005 that included wells drilled after 2000 suggest the presence of a steam phase in the reservoir. The steam could be generated with the boiling of deep reservoir fluid from a pressure drop. The mixing trend obtained for the natural state was also seen for 2005 data but lower temperatures (from 265 to 295 degrees Celsius) were obtained compared with those for natural conditions. The entry of lower

  8. Babel en la mina. El campamento minero como modelo de asentamiento en el mundo industrializado: Cerro Muriano (Córdoba.

    Directory of Open Access Journals (Sweden)

    Cano Sanchiz, J.M.

    2012-01-01

    Full Text Available El campamento minero contemporáneo es un tipo de asentamiento muy concreto, configurado bajo unos cánones que, con matices, suelen repetirse a escala internacional. Se trata de un lugar de convergencia, de fricción de clases. También, de un espacio heterogéneo desde el punto de vista cultural donde, sin embargo, el grupo humano formado por los obreros suele aparecer cohesionado por unas circunstancias comunes. Estas características se acentúan allí donde la inversión procede de un país distinto al de la mina. Hablamos, muchas veces, de territorios ocupados en el marco de una actividad económica de corte colonialista. Estas páginas recogen un análisis arqueológico del asentamiento surgido en torno a las minas de Cerro Muriano (Córdoba durante su explotación inglesa a principios del siglo XX. El ejemplo seleccionado nos sirve para ilustrar cómo fueron aquellos campamentos, muchos de los cuales sobrevivieron a la desaparición de la actividad minera y evolucionaron hacia núcleos de población consolidados, como es el caso.

  9. Dieta de murciélagos nectarívoros del Parque Nacional Cerros de Amotape, Tumbes

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    Edith Arias

    2011-07-01

    Full Text Available En el Perú se reporta la presencia de 18 especies de murciélagos nectarívoros, sin embargo se cuenta con poca información sobre la dieta de estas especies. En este estudio se reporta por primera vez la dieta de los nectarívoros Glossophaga soricina, Lonchophylla hesperia y Anoura geoffroyi en el bosque seco ecuatorial y del bosque tropical del Pacífico del Parque Nacional Cerros de Amotape, Tumbes. Analizamos 21 contenidos gastrointestinales e identificamos ocho morfotipos de polen pertenecientes a las familias Bombacaceae, Cactaceae, Fabaceae, Solanaceae, Rubiaceae, Myrtaceae, Malvaceae y Rosaceae. Encontramos evidencia del síndrome de quiropterofilia en Bombacaceae, Cactaceae, Fabaceae, Solanaceae y Rubiaceae. Observamos que A. geoffroyi consume polen de Ceiba trichistandra, Solanaceae y Rubiacea; G. soricina consume de Abutilon reflexum, Armathocereus cartwrightianus, C. trichistandra y Rubiaceae; y L. hesperia de A. cartwrightianus, Eriobotrya japonica, Fabaceae y Psidium sp.; sugiriendo una dieta generalista en estas especies. Los murciélagos G. soricina y A. geoffroyi comparten el consumo del ceibo C. trichistandra y de la Rubiaceae, mientras que G. soricina comparte con L. hesperia el consumo del cactus A. cartwrightianus. Los otros morfotipos de polen no fueron compartidos entre murciélagos. Se encuentra además que el ceibo C. trichistandra fue la especie más consumida, especialmente por G. soricina.

  10. Reproductive structures of Rhamnaceae from the Cerro del Pueblo (Late Cretaceous, Coahuila) and Coatzingo (Oligocene, Puebla) Formations, Mexico.

    Science.gov (United States)

    Calvillo-Canadell, Laura; Cevallos-Ferriz, Sergio R S

    2007-10-01

    Recently discovered fossil flowers from the Cretaceous Cerro del Pueblo and flowers and fruits from the Oligocene Coatzingo Formations are assigned to the Rhamnaceae. The Cretaceous flower, Coahuilanthus belindae Calvillo-Canadell and Cevallos-Ferriz, gen. et sp. nov., is actinomorphic with fused perianth parts forming a slightly campanulate to cupulate floral cup, with sepals slightly keeled and spatulate clawed petals. The Oligocene fossils include Nahinda axamilpensis Calvillo-Canadell and Cevallos-Ferriz, gen. et sp. nov. (characterized by its campanulate bisexual flower with stamens opposite, adnate to and enfolded by petals; and with the ovary ripening into a drupe), and a winged fruit assigned to Ventilago engoto Calvillo-Canadell and Cevallos-Ferriz, sp. nov. The flowers and drupe features indicate closer affinity to Zizipheae and/or Rhamneae, while the single samaroid fruit suggests the presence of Ventilagineae. However, the unique character combination in the fossil flowers precludes placing them in extant genera. Nevertheless, the history of the family is long and can be traced back to the Campanian. A detailed phylogenetic revision of the group that uses morphological characters from both extant and fossil plants is needed to better understand the significance of these records as well as other important fossils of the family.

  11. Effects of pressure drawdown and recovery on the Cerro Prieto beta reservoir in the CP-III area

    Energy Technology Data Exchange (ETDEWEB)

    Truesdell, A.H. [Truesdell (Alfred H.), Menlo Park, CA (United States); Lippmann, M.J. [Lawrence Berkeley National Lab., CA (United States)

    1998-02-01

    The production characteristics of wells in the northwestern Cerro Prieto III area changed greatly when the Cp-III power plant went on line in 1986. Fluid extraction in the field more than doubled and reservoir-wide boiling started immediately, greatly increasing the enthalpy of produced fluids. Some well fluids showed a decrease in chloride due to adiabatic steam condensation in the well and separator, and others were enriched in chloride due to boiling. As reservoir drawdown increased, entrance of cooler and more dilute groundwaters into the reservoir became evident (i.e., condensation stopped, and there was a decrease in enthalpy and chloride in produced fluids). Although some groundwater inflow was from the leaky western margin of the reservoir, the majority is in the northeast, inferred to be local and downward, possibly through more permeable zones associated with the normal fault H. This natural recharge and some reinjection have slowed and possibly reversed pressure drawdown throughout CP-III. Enthalpy has decreased and liquid saturation has increased as the steam-rich zone in the upper part of the reservoir has either disappeared or become thinner.

  12. Monitoring and modeling land subsidence at the Cerro Prieto Geothermal Field, Baja California, Mexico, using SAR interferometry

    Science.gov (United States)

    Carnec, Claudie; Fabriol, Hubert

    Images derived from repeat-pass spaceborne interferometric synthetic aperture radar (InSAR) systems offer the possibility of mapping surface deformation of small spatial extent and monitoring its spatio-temporal evolution. A slow local subsidence has been detected at the Cerro Prieto geothermal field from images acquired by the European Space Agency remote sensing satellites ERS-1/2 between 1993 and 1997. Although agricultural activity in the area limited the investigation, interferometric monitoring revealed that the ground deformation is associated with the withdrawal of geothermal fluid and agreed with the leveling data. Modeling of the subsidence was carried out assuming elastic deformation in a half-space from simple point sources, of which five were necessary to reproduce the fringe patterns observed on the interferograms. The depths and locations of three of the sources are compatible with the location of the known reservoir. The study improves prior knowledge of the displacement field and of the mecanisms involved in the subsidence phenomenon.

  13. Palynological analysis of camelid coprolites: seasonality in the use of the site Cerro Casa de Piedra 7 (Santa Cruz, Argentina)

    Science.gov (United States)

    Velázquez, Nadia Jimena; Burry, Lidia Susana; Fugassa, Martín Horacio; Civalero, María Teresa; Aschero, Carlos Alberto

    2014-01-01

    Palynological, palaeoparasitological and paleobotanical studies of coprolites found in archaeological sites from Perito Moreno National Park (47°57‧S72°05‧W) yielded information on diet, palaeoenvironment and health. These studies allowed adding evidence to the reconstruction of life history of the hunter-gatherers that inhabited Patagonia during the Holocene. We examined the season of the year when camelid Lama guanicoe coprolites (5400 ± 64 yr 14C BP to 9640 ± 190 yr 14C BP) were deposited at Cerro Casa de Piedra 7 (site CCP7). The study used palynological evidence and comparison with pollen spectra of modern feces collected during summer, fall, winter and spring of 2010. The dominant types were: pollen of Nothofagus, Empetrum rubrum, Asteraceae subfam. Asteroideae, Nassauvia, Caryophyllaceae and Poaceae; fern spores; remains of Eimeria macusaniensis; and plant remains of Poaceae, Festuca pallescens, Stipa speciosa, Armeria maritima, Gaultheria mucronata and E. rubrum. Pollen spectra of modern and fossil feces were used for multivariate analysis. Coprolites associated to fall and winter modern feces. These results and those obtained from pollen concentration values and the presence of pollen types indicators of seasonality, allowed the determination of summer, fall and winter coprolites. However, caution must be taken with the seasonality results of coprolites dated earlier than 9000 years BP since the environmental conditions differed from now. The site was probably a camelid shelter during the unfavorable seasons.

  14. The Cerro Bitiche Andesitic Field: petrological diversity and implications for magmatic evolution of mafic volcanic centers from the northern Puna

    Science.gov (United States)

    Maro, Guadalupe; Caffe, Pablo J.

    2016-07-01

    The Cerro Bitiche Andesitic Field (CBAF) is one of the two largest mafic volcanic fields in northern Puna (22-24° S) and is spatially and temporally associated with ignimbrites erupted from some central Andean Altiplano-Puna Volcanic Complex calderas. The CBAF comprises seven scoria cones and widespread high-K calcalkaline lava flows that cover an area of 200 km2. Although all erupted rocks have a relatively narrow chemical range (56-62 % SiO2, 3-6 % MgO), there is a broad diversity of mineral compositions and textures. The least evolved lavas (˜58-61 % SiO2) are high-Mg andesites with scarce (andesites (˜62 wt% SiO2), on the other hand, are porphyritic rocks with plagioclase + orthopyroxene + biotite and ubiquitous phenocryst disequilibrium textures. These magmas were likely stored in crustal reservoirs, where they experienced convection caused by mafic magma underplating, magma mixing, and/or assimilation. Trace element and mineral compositions of CBAF lavas provide evidence for complex evolution of distinct magma batches.

  15. El patrimonio industrial petrolero en la Patagonia: Comodoro Rivadavia (Argentina y Cerro Sombrero (Chile. Una perspectiva comparada

    Directory of Open Access Journals (Sweden)

    Pía Acevedo Méndez

    2016-01-01

    Full Text Available El hallazgo de petróleo en Comodoro Rivadavia (Chubut, Argentina y en Manantiales (Tierra del Fuego, lado chileno, motivó la construcción de espacios socioproductivos bajo el modelo de Company Towns. En el caso argentino la empresa estatal Yacimientos Petrolíferos Fiscales (Y.P.F creó el Campamento Central y la Empresa Nacional del Petróleo (ENAP creó Cerro Sombrero en Chile, los que en la década de 1970 formaron dos tejidos urbanos (barrio en el caso argentino y pueblo en el caso chileno. En esta dinámica se transformó el modo de habitar de ambos espacios, que se convirtieron en potenciales elementos turísticos, teniendo en cuenta que desde el año 2014 poseen reconocimiento patrimonial relacionado con su pasado petrolero y su arquitectura moderna. El objetivo es comparar cómo ambas empresas petroleras estatales construyeron dichos espacios “urbanos” y sus comunidades sociolaborales e indagar en la relación identidad/ patrimonio de ypefeanos y enapinos.

  16. Astronomical orientations in the Iberian oppidum of Cerro de las Cabezas (Valdepeñas, Ciudad Real

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    César Esteban

    2017-01-01

    Full Text Available We present an archaeoastronomical analysis of the orientations observed in the entrance-sanctuary and other enclosures at the Iberian oppidum Cerro de las Cabezas (Valdepeñas, Ciudad Real, Spain, located in the northern Oretania. The most important result of this work is that two of the perimeter walls of the entrance-sanctuary are oriented towards the sunrise, one at the equinoxes and the other at the summer solstice. As in other Iberian sanctuaries, an equinoctial marker is also found. This coincides with the top of one of the most distant mountains of the horizon. The possibility that other walls of the entrance-sanctuary may be oriented to the rising of several of the brightest stars in the sky is also discussed. Moreover, it is found that the east-west axis of the southern part of the oppidum (where an enclosure that some authors have interpreted as a possible sanctuary is located is oriented approximately toward the sunrise at the winter solstice. Finally a possible alignment between the entrance-sanctuary, a necropolis located at the east and the point of the horizon where the sunrise of the winter solstice occurs is also reported.

  17. El frente de corrimiento andino al nivel de los cerros Penitentes y Visera (alta Cordillera de Mendoza: aspectos cronológicos y cartográficos The Andean thrust front in the Cerros Penitentes and Visera (High Cordillera of Mendoza: chronological and cartographic aspects

    Directory of Open Access Journals (Sweden)

    Jean-Claude Vicente

    2009-10-01

    Full Text Available El hallazgo de una iportante fauna de invertebrados marinos del Tithoniano superior a espaldas del cerro Penitentes en la secuencia carbonática basal de la primera escama del frente de corrimiento andino, confirma la lógica tectónica de un despegue de esta unidad a nivel del Yeso Principal y lleva a invalidar ciertas correlaciones litoestratigráficas y bosquejos paleogeográficos asignados a la Formación La Manga. Por otro lado, el análisis de algunos perfiles claves en torno al cerro Penitentes entre la quebrada Vargas y el cerro Visera permite presentar una reinterpretación tectónica del sector. Esta se sustenta en el reconocimiento y la diferenciación de las unidades terciarias básicas representadas por los Conglomerados Penitentes (Mioceno inferior y los Aglomerados Santa María (Mioceno superior en una relación muy similar a la descrita anteriormente al norte de Puente del Inca. El estudio permite seguir las interferencias, en un contexto polifásico, entre las reactivaciones del corrimiento Penitentes de piel fina y un cabalgamiento frontal de piel gruesa que repite la secuencia terciaria. La discordancia entre las secuencias terciarias y el emplazamiento de una klippe de Malm sobre los Conglomerados Penitentes del sinclinal del cerro Visera, conduce a otorgar cierta importancia a la fase del final del Mioceno inferior.The finding of an important marine invertebrate fauna of Upper Tithonian age at the shoulders of the Penitentes hill, in the basal carbonatic sequence of the first Andean wedge confirms the tectonic logic of a detachment of this unit at the level of the Yeso Principal. This allows invalidating certain lithostratigraphic correlations and paleogeographic sketches ascribed to the La Manga Formation. On the other hand, the analysis of some key sections around the Penitentes hill area between the Quebrada de Vargas and the Cerro Visera, allows presenting a tectonic reinterpretation of the sector. This is based on the

  18. Association of the bovine major histocompatibility complex (BoLA BoLA-DRB3 gene with fat and protein production and somatic cell score in Brazilian Gyr dairy cattle (Bos indicus

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    Carlos Souza do Nascimento

    2006-01-01

    Full Text Available The effect of the bovine major histocompatibility complex (BoLA locus on animal health may be due to a direct action of its alleles on immune functions, whereas its indirect effect on production traits might be explained by the better general health conditions of more productive animals. In the present study, the BoLA-DRB3 gene was investigated in 1058 cows belonging to seven Brazilian Gyr Dairy herds (Bos indicus, Zebu cattle. A total of 37 alleles were identified, 15 of them described for the first time in a Zebu breed. A highly significant association (p < 0.02 was observed between allele *54 and a decrease (-26.1 kg in milk protein yield and there was a significant association (p < 0.05 between this allele and lower (-26.07 kg milk fat yield. There was also a significant association (p < 0.05 between allele *6 and decreased (-12.47 kg milk protein and allele *7 and increased (12.72 kg milk protein. There were also indications of association (p < 0.10 between somatic cell score (SCS and alleles *3 (SCS increased by 0.54 units and *31 (SCS increased by 0.46 units. The highly significant association of allele *54 with lower protein yield suggests the possible use of this allele in marker-assisted selection programs.

  19. Análisis de la diversidad de suelos y series vegetales en la provincia de Almería.

    OpenAIRE

    Fernández de Romarategui Ibáñez de Maestu, Izaskun

    2014-01-01

    En este Proyecto Fin de Máster se realiza un estudio de la diversidad en la Provincia de Almería, analizando los suelos y las series de vegetación en relación con los pisos bioclimáticos de la zona de estudio Objetivos: 1. Definir una metodología que permita obtener un análisis de la diversidad de suelos y series de vegetación en la provincia de Almería, en base a los pisos bioclimáticos presentes como unidades espaciales con vistas a su análisis estadístico. Esta metodología se basa...

  20. Red de la Ciencia: Análisis e Impacto en la Provincia de Sancti Spíritus.

    Directory of Open Access Journals (Sweden)

    María Ofelia Guardiola Fernández

    2009-12-01

    Full Text Available En el presente trabajo se abordan aspectos importantes como el Acceso Abierto a la Información así como la Propiedad Intelectual. Dos aspectos a consideración de las autoras que pueden repercutir positivamente en el desarrollo y divulgación del quehacer científico de la Provincia. Se pone a disposición de los lectores un ejemplo palpable de una de las vías para llegar al Acceso Abierto: Red de la Ciencia. Se hace un análisis desde que comienza en la Provincia el Proyecto llevado a cabo por el IDICT; período comprendido entre 2006 y junio del 2009. Se menciona el impacto que este proyecto ha tenido en el territorio.

  1. Implantación y evolución de la encomienda en la provincia de Tabasco, 1522-1625

    Directory of Open Access Journals (Sweden)

    Jiménez Abollado, Francisco L.

    2000-06-01

    Full Text Available El presente trabajo intenta analizar la evolución de una institución como la encomienda en la Provincia de Tabasco, desde su implantación en 1522 hasta el primer cuarto del siglo XVII. Se hace hincapié en la importancia de dicha institución la de mayor atractivo socio-económico para la escasa población española asentada en la provincia, debido al carácter fronterizo y marginal de la misma, y a la escasez de otros incentivos económicos. Asimismo, se examinan algunos aspectos como la incorporación de pueblos a la Real Corona y la política de “ayudas de costa”, como fuentes de compensación para aquellos pobladores y descendientes de conquistadores que no poseían encomiendas.

  2. Ministerio público y el acceso a la justicia: el caso de la Provincia de Buenos Aires

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    Gabriel Costantino

    2015-10-01

    Full Text Available Desde 1997 el gobierno de la Provincia de Buenos Aires ha iniciado una serie de reformas para estructurar un sistema penal más eficaz y equitativo a la hora de perseguir los delitos y garantizar los derechos de los ciudadanos. Un punto importante de estas reformas es el nuevo rol del Ministerio Público y su articulación con las demás instituciones del Estado para promover dichas finalidades. Situado en este contexto, mi trabajo se propone analizar la reforma del sistema de persecución criminal de la provincia de Buenos Aires, deteniéndose en tres niveles de análisis: 1 el nuevo marco normativo del sistema de persecución penal; 2 las principales estrategias de persecución penal implementadas por los funcionarios del Ministerio Público; 3 las consecuencias de estas estrategias para el acceso a la justicia.

  3. ESTRATEGIA DE REMONTAJE APLICADA SOBRE EL REGISTRO CERÁMICO DEL SITIO LOS TRES CERROS 1 (DELTA SUPERIOR DEL RÍO PARANÁ / Refitting applied to pottery from Los Tres Cerros 1 site (Upper Delta of Paraná River

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    Violeta Soledad Di Prado

    2014-12-01

    Full Text Available El sitio arqueológico Los Tres Cerros 1 se encuentra ubicado en el departamento Victoria, Entre Ríos, y consiste en una estructura monticular con una compleja historia ocupacional. La abundancia y fragmentación del registro cerámico del sitio, llevaron a aplicar la estrategia de remontajes, con el propósito de reconstruir la historia de vida de las vasijas e identificar las prácticas humanas y los agentes naturales que actuaron en la configuración del depósito. Sobre una muestra del total de tiestos recuperados en la cuadrícula 1, se realizaron 43 remontajes, que unen fragmentos del mismo nivel y de diferentes niveles. Se identificaron semejanzas en las elecciones técnicas similares (i.e., agregado de tiesto molido, aplicación de pigmento y de surco rítmico efectuadas en distintas etapas del proceso de elaboración del número mínimo de vasijas estimado (NMV= 49. Se reconocieron contenedores utilizados sobre el fuego, posiblemente para la cocción, y piezas probablemente empleadas para servir. Por último, se propusieron hipótesis en torno a la integridad del registro y, al menos para el sector superior de la secuencia estratigráfica, se infirió un evento de ocupación que no fue mayormente disturbado en momentos posteriores al descarte.   Palabras clave: alfarería, remontajes, elecciones tecnológicas, prácticas de uso, procesos de formación de sitio.   Abstract Los Tres Cerros 1 archaeological site is located in Victoria department, Entre Ríos province, and it is a mound with a complex occupational history. The abundance and fragmentation of the ceramic record recovered from this site, led to apply the refitting strategy in order to reconstruct the vessels’ life history and identify human practices and natural agents that took part in the site configuration. From a ceramic sample of the whole recovered in grid 1, 43 reassemblies were made, joining sherds from the same level, as well as from different levels. Similar

  4. Analysis of productive evolution of well M-19A, Cerro Prieto geothermal field, BC; Analisis de la evolucion productiva del pozo M-19A del campo geotermico de Cerro Prieto, BC

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez-Rodriguez, Marco H; Romero-Rios, Francisco [Comision Federal de Electricidad, Residencia General de Cerro Prieto, B.C (Mexico)]. E-mail: marco.rodriguez01@cfe.gob.mx

    2007-07-15

    Well M-19A has been the most productive in the Cerro Prieto field, producing around 40 million tons of fluid. The well went on line in February 1975 and was in continuous operation until June 2006. Monthly measurements for over 30 years of operating conditions and chemical and isotopic analyses of the fluids allow identification of the most significant processes occurring in the zone where the well is located. Three dominant recharge types have been identified, each lasting about 10 years. They are a) a recharge of fluids of lower temperature than the production fluids, even though the chemical and isotopic compositions are similar; b) a recharge of lower-temperature fluids with diluted chemical and isotopic compositions; and c) a progressive recharge of reinjected water with a higher chloride concentration and heavy isotopic composition. The production and reinjection rates for over 30 years of production history in the M-19A well zone allow for speculation of a reservoir pressure recovery, which is confirmed with a calculation using production data from well M-19A. The evolution of the reservoir pressure in the zone contrasts with the rest of the reservoir, where a constant pressure drop is observed, particularly toward the central and eastern parts of the field. [Spanish] El pozo M-19A ha sido el mas productivo del campo geotermico de Cerro Prieto, BC, alcanzando una extraccion de mas de 40 millones de toneladas de fluido. Fue integrado a produccion en febrero de 1975 y hasta junio de 2006 ha permanecido en produccion en forma continua. Las mediciones mensuales de sus condiciones operativas y los analisis quimicos e isotopicos del agua producida permiten identificar los procesos mas significativos que han ocurrido a lo largo de esos mas de 30 anos en la zona donde se localiza el pozo. Se han identificado tres tipos de recarga dominantes que se presentan durante un periodo cercano a 10 anos cada uno, los cuales son: a) una recarga de fluidos de menor temperatura

  5. Control estructural de las mineralizaciones de fluorita del batolito Cerro Áspero, Sierras Pampeanas de Córdoba Structural control of vein-type fluorite deposits of Cerro Áspero batholith, Sierras Pampeanas of Córdoba

    Directory of Open Access Journals (Sweden)

    Jorge E Coniglio

    2010-12-01

    Full Text Available Con más de 1.000.000 t de reservas totales el batolito Cerro Áspero, magmatismo devónico de alto potasio, es portador de las mayores concentraciones de fluorita de las Sierras Pampeanas. Las vetas epitermales son de edad cretácica, subverticales, poseen potencias generalmente menores a 3 m y se extienden a profundidades mayores a 200 metros. Ocurren en un área de 440 km² con una distribución intrabatolítica predominante. La geometría y la cinemática de las estructuras mineralizadas son consistentes con deformación por cizalla simple, dextrógira, con el eje extensional principal (σ3 orientado hacia el NNO. Esta situación implantó en el área estructuras extensionales N70ºE ( 4 km de corrida, que presentan patrones de fallas transcurrentes, con bifurcaciones, deflexiones, aperturas, saltos, cierres y fracturas en échelon asociadas. Los estudios texturales y estructurales en las vetas han permitido distinguir cuatro estadios sucesivos de mineralización que fueron controlados por una actividad discontinua de la cupla dextral. Este modelo estructural es similar a aquéllos propuestos para mineralizaciones de fluorita emplazadas en otros sectores del continente durante el mismo período, los que vinculan el control tectónico con la apertura del océano Atlántico sur. El registro del relleno hidrotermal permitió reconstruir la historia de apertura de las estructuras y puede usarse como un criterio efectivo de prospección y exploración. Las mayores concentraciones de mineral ocurren en las estructuras extensionales y en las flexiones dilatantes de las estructuras asociadas con la zona de cizallamiento principal NNE-SSO, que registran la secuencia mineralizada completa.With over 1,000,000 t of total reserves, the high-K devonian granites of the Cerro Áspero batholith (440 km² are the most important fluorite-bearing granitic suite in the Sierras Pampeanas. The epithermal fluorite veins, of Cretaceous age, fill in steeply dipping

  6. CIRCULACION DEL NEUMOCOCO RELACIONADO A CAMBIOS EN LOS FACTORES CLIMÁTICOS EN LA PROVINCIA DE LA RIOJA

    OpenAIRE

    Patricia Cordoba, PhD; Mónica Romanazzi; Sonia Flores; Patricia Torres; Jose Maria Barrios

    2003-01-01

    Resumen: Streptococo pneumoniae (Neumococo), Neisseria meningitidis y Haemophilus influenzae producen meningitis bacterianas. Este trabajo describe las caracteristicas del aumento de casos de meningitis bacterianas en la Provincia de la Rioja, Argentina. Se realizó un estudio descriptivo retrospectivo de las meningitis desde 1997 hasta 2001. Se estudió la circulación de los agentes etiologicos; la distribución de las neumonías y bacteriemias producidas por neumococo; las variaciones de la ...

  7. Estimación de la discriminación salarial femenina en la provincia de Segovia

    OpenAIRE

    2016-01-01

    Estudio o análisis sobre la discriminación salarial femenina en la provincia de Segovia, haciendo una comparativa a niveles regionales y nacionales, incluyendo un análisis de la brecha salarial en función de las características de los trabajadores así como de las empresas y puestos del trabajo. Grado en Administración y Dirección de Empresas

  8. La provincia de Segovia a mediados del Siglo XIX según el diccionario de Pascual Madoz

    OpenAIRE

    Montes Martín, María

    2015-01-01

    Análisis de la situación que vivió la provincia de Segovia durante el fin del Siglo XVIII y el inicio del XIX a través del Diccionario-geográfico-estadístico-histórico de Pascual Madoz. Influencia de la población, agricultura, ganadería e industria en la evolución económica.

  9. Análisis del contenido de carotenoides florales de plantas que crecen en la provincia de Buenos Aires (Argentina)

    OpenAIRE

    Natalucci, Claudia Luisa

    1982-01-01

    Se ha estudiado el contenido en carotenoides totales, carotenos y pigmentos monohidroxilados y dihidroxilados presentes en flores de especies que crecen en estado silvestre o que se cultivan en la provincia de Buenos Aires, entre las que se incluyen con propósitos comparativos las variedades de Tagetes erecta L. de flores amarillas y anaranjadas. Los carotenos predominan en seis de las especies estudiadas y las xantofilas en las trece restantes, entre las que se encuentra Ranunculus repens L....

  10. Determinaciòn de actividad viral de fiebre aftosa en bovinos de la Provincia del Azuay: estudio preliminar

    OpenAIRE

    Vaca Vaca, Carlos; López, Gonzalo

    2003-01-01

    Se llevò a cabo la investigaciòn con la finalidad de relievar la actividad viral de la Fiebre A ftosa para establecer la prevalencia de los mismos para la totalidad de la provincia y determinar la actividad viral por àreas y confirmar las presunciones epidemiològicas para cada cantòn Magister en Producciòn Animal. Mención bovinos Cuenca

  11. La política de ordenación del suelo y sus usos en la Provincia de Granada

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    Amparo Ferrer

    2000-01-01

    Full Text Available El objetivo del presente trabajo es analizar el uso del suelo en la provincia de Granada, así como su evolución más reciente, teniendo presente tanto el marco legal como el de la planificación urbanística tanto supramunicipal como municipal. Los cambios de uso se han analizado en las dos categorías básicas de tipos de suelo: urbano y agrario.

  12. Paleoparasitologia en coprolitos del Parque Nacional Perito Moreno, provincia de Santa Cruz, Argentina

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    Fugassa, Martín H.

    2005-01-01

    Full Text Available El objetivo del trabajo fue conocer algunas de las parasitosis que existían en América precolombina y discutir diversos aspectos ecológico-culturales. El coprolito examinado provino del sitio Cerro Casa de Piedra 5 (CCP5, Parque Nacional Perito Moreno, Santa Cruz, Argentina. Las muestras fueron rehidratadas con fosfato trisódico acuoso y procesadas por sedimentación espontánea. Existieron dificultades para la determinación del origen zoológico del coprolito-cánido o humano-y el análisis de los restos macroscópicos y pelos presentes resultó decisivo. Los resultados evidenciaron un caso de poliparasitismo entre los que se hallaron huevos correspondientes al género Trichuris y a especies del género Capillaria. Otros hallazgos corresponden a huevos atribuibles a ascarididos, eucestodes y ooquistes de coccidios. Se hallaron huevos que no pudieron determinarse si correspondían a ácaros o pentastómidos. La muestra analizada ha aportado información inédita sobre el parasitismo en Patagonia Austral precolombina. Se discute su significado bioantropológico. Los resultados presentados permiten demostrar el valor de la recuperación de coprolitos y sedimentos arqueológicos.

  13. Geología de la región del Cerro Guanaquero, Río Diamante, Mendoza

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    Federico Fuentes

    2008-03-01

    Full Text Available El estudio realizado presenta nuevos datos sobre un sector poco conocido de la Cordillera Principal de Mendoza, en la alta cuenca del río Diamante en las adyacencias del cerro Guanaquero, y los primeros datos geocronológicos de sus rocas volcánicas. Las unidades geológicas presentes en el área se dividen en cuatro grupos principales: secuencias sedimentarias mesozoicas marinas y continentales intensamente plegadas y falladas; intrusivos y volcanitas intermedias de edad neógena; rocas volcánicas pliocenas a recientes de composición intermedia a básica, y depósitos cuaternarios inconsolidados. El cerro Guanaquero, un estratovolcán pliocuaternario intensamente erosionado por glaciares pleistocenos, con sus 4.841 metros es el rasgo orográfico más prominente. Está constituido esencialmente por andesitas grises porfíricas, piroxénicas a biotíticas. Intercaladas con las coladas andesíticas se presentan depósitos piroclásticos, aglomerados volcánicos, ignimbritas y basaltos. La datación de una andesita por el método K-Ar en roca total arrojó una edad de 1,4 ± 0,1 Ma. La deformación ándica comenzó en forma de una faja plegada y corrida de piel fina, con pliegues por despegue en el sector occidental y por propagación de falla en el oriental. La compresión al oeste de los 69º47´O terminó por invertir la fallas normales del rift mesozoico. A lo largo de este meridiano se encuentra la falla más importante de la región, la que se ha correlacionado con la falla Malargüe, bien desarrollada en latitudes más australes. Esta falla limita la faja plegada y corrida del Aconcagua, de naturaleza epidérmica, y la faja plegada y corrida de Malargüe, controlada por la inversión tectónica del basamento. El volcanismo fue muy intenso en el Plioceno y el Cuaternario, correspondiendo a un período de empinamiento de la placa oceánica subducida, en el que la región ha sido levantada pasivamente. La alta resistencia a la erosión de

  14. Il rifornimento della rete commerciale al dettaglio della Provincia di Napoli

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    Marino de Luca

    2010-07-01

    Full Text Available Nella nota vengono sintetizzate le principali conclusioni cui è pervenuta una ricerca finanziata dalla Camera di Commercio di Napoli e realizzata da Uniontrasporti e dal dipartimento di Ingegneria dei trasporti della Federico II. Il lavoro ha riguardato il settore prevalente della city logistics e cioè il rifornimento di quegli esercizi della rete commerciale al dettaglio che non dispongono di organizzazioni autonome già oggi sotto controllo come, ad esempio, hanno la Grande distribuzione, il trasporto dei giornali, dei prodotti farmaceutici, degli ortofrutticoli ecc. Il lavoro è stato caratterizzato da alcune specificità: • è basato su una conoscenza quantitativa diretta della domanda di rifornimento merci nell’area metropolitana di Napoli ottenuta da una rilevazione campionaria sul campo (2000 interviste • si riferisce ad un’area metropolitana e non ad una singola città, prevedendo che una diversa organizzazione del rifornimento deve riguardare tutti gli esercizi del territorio sul quale operano le aziende del settore, territorio che, per le grandi città, coincide con l’area metropolitana • prevede la realizzazione di due tipologie di “nodi” nei quali effettuare manipolazione delle merci: centri merci inseriti negli interporti dell’area per i flussi provenienti o destinati in zone molto distanti (Italia del centro, del nord e del sud e transit point “di quartiere” dai quali partire per raggiungere il destinatario finale con mezzi a mano o ad emissione zero o anche con ritiro a cura del destinatario stesso. Le principali dimensioni della domanda desunte dall’indagine eseguita possono essere sintetizzate nelle seguenti cifre: 27.000 consegne/giorno-medio (0,87 per esercizio per 260.000 colli (9,72 a consegna su tutto il territorio della provincia; il 44% destinate alla città di Napoli, il 45% destinato al resto dell’area metropolitana di Napoli e l’11% al resto della provincia; il 34% proviene invece da

  15. Control estructural de las mineralizaciones de fluorita del batolito Cerro Áspero, Sierras Pampeanas de Córdoba

    Directory of Open Access Journals (Sweden)

    Jorge E Coniglio

    2010-12-01

    Full Text Available Con más de 1.000.000 t de reservas totales el batolito Cerro Áspero, magmatismo devónico de alto potasio, es portador de las mayores concentraciones de fluorita de las Sierras Pampeanas. Las vetas epitermales son de edad cretácica, subverticales, poseen potencias generalmente menores a 3 m y se extienden a profundidades mayores a 200 metros. Ocurren en un área de 440 km² con una distribución intrabatolítica predominante. La geometría y la cinemática de las estructuras mineralizadas son consistentes con deformación por cizalla simple, dextrógira, con el eje extensional principal (σ3 orientado hacia el NNO. Esta situación implantó en el área estructuras extensionales N70ºE ( 4 km de corrida, que presentan patrones de fallas transcurrentes, con bifurcaciones, deflexiones, aperturas, saltos, cierres y fracturas en échelon asociadas. Los estudios texturales y estructurales en las vetas han permitido distinguir cuatro estadios sucesivos de mineralización que fueron controlados por una actividad discontinua de la cupla dextral. Este modelo estructural es similar a aquéllos propuestos para mineralizaciones de fluorita emplazadas en otros sectores del continente durante el mismo período, los que vinculan el control tectónico con la apertura del océano Atlántico sur. El registro del relleno hidrotermal permitió reconstruir la historia de apertura de las estructuras y puede usarse como un criterio efectivo de prospección y exploración. Las mayores concentraciones de mineral ocurren en las estructuras extensionales y en las flexiones dilatantes de las estructuras asociadas con la zona de cizallamiento principal NNE-SSO, que registran la secuencia mineralizada completa.

  16. Hydrothermal-flow regime and magmatic heat source of the Cerro Prieto geothermal system, Baja California, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Elders, W.A.; Bird, D.K.; Williams, A.E.; Schiffman, P.

    1982-01-01

    This detailed three-dimensional model of the natural flow regime of the Cerro Prieto geothermal field, before steam production began, is based on patterns of hydrothermal mineral zones and light stable isotopic ratios observed in rock samples from more than fifty deep wells, together with temperature gradients, wireline logs and other data. At the level so far penetrated by drilling, this hydrothermal system was heated by a thermal plume of water close to boiling, inclined at 45/sup 0/, rising from the northeast and discharging to the west. To the east a zone of cold water recharge overlies the inclined thermal plume. Fission track annealing studies shows that the reservoir reached 170/sup 0/C only 10/sup 4/ years ago. Oxygen isotope exchange data indicate that a 12 km/sup 3/ volume of rock subsequently reacted with three times its volume of water hotter than 200/sup 0/C. Averaged over the duration of the heating event this would require a flow velocity of about 6 m/year through the pores of a typical cross section of the reservoir having an average porosity of 10%. Although this is an extensional tectonic environment of leaky transform faulting in which repeated intrusions of basalt magma are likely, for simplicity of computation possible heat sources were modelled as simple two dimensional basalt intrusions of various sizes, shapes and locations. We have calculated a series of two-dimensional convective heat transfer models, with different heat sources and permeability distributions. The models which produce the best fit for the temperature distributions observed in the field today have in common a heat source which is a funnel-shaped basalt intrusion, 4 km wide at the top, emplaced at a depth of 5 km to 6 km about 40,000 to 50,000 years ago.

  17. Magmatismo ácido del mioceno superior-cuaternario en el área de Cerro Blanco-La Hoyada, Puna Austral

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    María Carolina Montero López

    2010-11-01

    Full Text Available El volcanismo de composición ácida desarrollado en la Puna Austral entre el Mioceno superior y el Holoceno está representado en el extremo oriental de la cordillera de San Buenaventura (26°25'-27°00'S y 67°25'-67°50' O por dos unidades: Ignimbrita Aguada Alumbrera y Complejo Volcánico Cerro Blanco. Hacia el norte y noroeste de esta área afloran flujos piroclásticos (Ignimbrita Rosada cuyo análisis se presenta aquí a fines comparativos. Estas rocas volcánicas apoyan sobre un basamento metamórfico de mediano a alto grado con intrusivos del Neoproterozoico-Paleozoico inferior y rocas volcánicas de composición intermedia de ca. 9-7 Ma. Las rocas estudiadas abarcan un lapso entre el Mioceno superior (Ignimbrita Aguada Alumbrera e Ignimbrita Rosada hasta el Holoceno (Complejo Volcánico Cerro Blanco, tienen afinidad calcoalcalina y son principalmente de composición riolítica. En este estudio se presentan nuevos datos de campo que permiten ordenar la estratigrafía del sector de estudio, así como resultados de geoquímica. Las ignimbritas del Mioceno Superior-Plioceno estudiadas presentan características similares a las rocas ácidas aflorantes al oeste del área de estudio, las cuales fueron relacionadas por diversos autores a un ambiente de subducción procedentes de fuentes mantélicas con altos porcentajes de contaminación cortical, mientras que el Complejo Volcánico Cerro Blanco podría estar reflejando su procedencia de la fusión directa de la corteza, si bien esta hipótesis debe ser corroborada con mayor cantidad de datos geoquímicos.

  18. Monitoreo de DDI en la zona andina de la provincia de Chubut (2004

    Directory of Open Access Journals (Sweden)

    J. L. Tellechea

    2009-03-01

    Full Text Available Un total de 444 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos localidades de la zona andina de la provincia de Chubut: Esquel (292 niños y Cushamen (152 niños. La edad de los escolares osciló entre 5 y 13 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-20, se tomó como única referencia la palpación de H.N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (139 de Esquel y 133 de Cushamen. Se recolectaron 213 muestras de sal de consumo hogareño de Esquel y 144 de Cushamen, para medir su contenido en yodo. El examen palpatorio de los niños reveló la existencia de bocio grado 1 solamente. La prevalencia de bocio encontrada fue de 2,1% en Esquel y de 3,3% en Cushamen. Los niveles de yoduria alcanzaron, en Esquel, una media de 238±119(DSμg/L y una mediana de 214μg/L, al tiempo que en Cushamen la media fue de 270±187μg/L y la mediana de 238μg/L. El contenido de yodo de las sales que aportaron los alumnos tuvieron un nivel adecuado de yodo, sobre todo en aquellas de consumo masivo. De esta manera, observamos que en la ciudad de Esquel el promedio de yodo en la sal, tomada en conjunto, fue de 30,6 ± 8,1 mg/Kg, mientras que para Cushamen fue de 31,1 ± 10,5 mg/Kg. Al analizar las concentraciones de yodo <15mg/Kg, observamos que fue del 3,0% en Esquel y del 7,4% en Cushamen. Teniendo en cuenta la línea de corte del 10% que fija el ICCIDD (21 como valor óptimo, podemos observar que la situación de ambas poblaciones es muy satisfactoria. Concluimos que en estas dos poblaciones de la zona andina de la provincia de Chubut ya no existe bocio endémico.

  19. Historia de la oftalmología en la provincia de Sancti Spíritus.

    Directory of Open Access Journals (Sweden)

    Silvia Landaburo Valle

    2006-10-01

    Full Text Available Con el triunfo de la Revolución Cubana en 1959 el país comenzó a realizar varias trasformaciones importantes para la vida de la población, siendo de gran valor entre otras el desarrollo de la educación y la salud. Este sector brindaba atención no gratuita a enfermos con diferentes patologías, los que eran atendidos por un médico general ya que existía un pobre desarrollo en diversas especialidades dentro de la medicina, siendo la oftalmología una de las más afectadas, por lo que nos dedicamos al estudio de la historia de la misma en la provincia la cual data de la década del 1930 hasta el año 2005. Se hace un recuento cronológico de todo cuanto ha acontecido con relación a dicha disciplina. Para realizar este estudio interrogamos a diferentes personas que habitaron en la localidad en el momento en que comenzaban a darse los primero pasos con relación a esta entidad. Fue importante descubrir que médicos generales y optometristas, algunos de ellos formados de forma empírica, eran los que ocupaban la responsabilidad de atender aquellas patologías relacionadas con el ojo, sin que el paciente pudiera alcanzar la atención especializada porque no existía en el territorio ningún oftalmólogo y los estos eran remitidos a la ciudad de Santa Clara o Camaguey cuando el médico no era capaz de realizar un diagnóstico certero de la afección que aquejaba al enfermo. Todo ello comenzó a cambiar en la década del 60 cuando se realizó la primera cirugía de catarata en la provincia practicada por el Dr. Puentes en 1962. Gracias a la preocupación constante de nuestro Gobierno Revolucionario y al desarrollo científico técnico que ha tenido nuestro país en los últimos años, se han obtenido logros en aras de brindar una asistencia médica integral especializada a nuestra población y así mejorar su calidad de vida.

  20. El sistema de la provincia metalúrgica circumpóntica

    Directory of Open Access Journals (Sweden)

    Chernij, E. N.

    1990-12-01

    Full Text Available The Circumpontic metallurgical province represented a system of centres of production of copper, arsenical bronzes and tin bronze artefacts of similar morphology, all closely interrelated. This wide system undoubtedly played a central role in the Old World during more than a millenium and a half (from the middle of the fourth millenium to the beginning of the second millenium B.C. embracing the cultures of Early and Middle Bronze Ages in the territory of southern half of Eastern Europe, the Caucasus, Asia Minor and Balkan-Carpathian region. The problem of morphology and the technology of production is studied in the framework of wide relations, the dynamics of development of different cultural and productive systems, the province's rather rapid formation and its fortuitous destruction. Furthermore issues are examined regarding the functional character of metallurgical production inside the boundaries of the province and the obvious decay of the metallurgy in Asia Minor and Near East from the middle of the second millenium B.C.

    La Provincia Metalúrgica Circumpóntica representaba un sistema de centros de producción de cobre, bronces arsenicales y objetos de bronce de morfología similar, estrechamente interconectados. Este amplio sistema jugó sin duda, un papel central en el Viejo Mundo durante más de un milenio y medio (desde la mitad del IV al inicio del II milenio a. C. abarcando las culturas de las Edades del Bronce Antiguo y Medio en el territorio de la mitad meridional de Europa oriental. el Cáucaso, Asia Menor y la región Cárpato-Balcánica. Se estudia el problema de la morfología y la tecnología de la producción en el marco de unas amplias relaciones, la dinámica de desarrollo de diferentes sistemas culturales y productivos, su formación bastante rápida y su destrucción fortuita. Además se han examinado las cuestiones relativas a la funcionalidad de la producción metalúrgica dentro de las fronteras de la Provincia

  1. Procedencia de los depósitos del Grupo Payogastilla (Cenozoico, río Calchaquí, provincia de Salta Provenance of the Payogastilla Group (Cenozoic, Calchaquí river, Salta Province

    Directory of Open Access Journals (Sweden)

    Claudia Inés Galli

    2011-06-01

    Full Text Available Se realiza el estudio de procedencias de los depósitos cenozoicos expuestos en la zona sur del valle Calchaquí, provincia de Salta que comprenden a sedimentitas fluviales del Grupo Payogastilla (Eoceno medio-Mioceno superior. La sucesión analizada se encuentra muy bien expuesta en ambas márgenes del río Calchaquí y consta de 5.400 metros de depósitos clásticos, integrada, de base a techo, por las formaciones Los Colorados, Angastaco, Palo Pintado y San Felipe. Se describen características mineralógicas, petrográficas, geoquímicas y de difracción de rayos X de las facies constituyentes de las formaciones Los Colorados, Angastaco y Palo Pintado, incorporándose el análisis de proveniencia asociado al estudio de paleocorrientes. El componente mayoritario, en las facies de areniscas, está caracterizado por granos de cuarzo, mientras que otros detritos son de: feldespatos potásicos, plagioclasas alteradas, pertitas y abundante micas. Los depósitos conglomerádicos matriz- soporte, siendo sus clastos mayoritarios de pegmatitas, granitos, cuarzos, esquistos, gneis y migmatitas. La geoquímica de elementos mayores y tierras raras de clastos de la Formación Angastaco muestran composiciones similares a la de rocas de la Faja Eruptiva de la Puna Oriental y cuerpos intrusivos ordovícicos-silúricos de Sierras Pampeanas. Los análisis de difracción de rayos X de muestras de arcillitas de la Formación Palo Pintado presentan illita y montmorillonita, que son interpretadas como de origen detrítico, mientras que la saponita ha sido generada por bisialitización (hidrólisis en un clima templado-húmedo. Las características composicionales y los datos de paleocorrientes medidos sugieren que durante el Eoceno medio al Mioceno superior el aporte principal de los materiales fue de zonas positivas de diferente composición de los afloramientos de cumbres de Luracatao y sierra de Vázquez, como así también de los cerros Runo, Durazno, sierra

  2. Estudio de los niveles de plomo, cadmio, zinc y arsénico, en aguas de la provincia de Salamanca

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    Blanco Hernández Angel Luis

    1998-01-01

    Full Text Available FUNDAMENTOS: Conocer el grado de contaminación por plomo, cadmio, cinc y arsénico de las aguas de la provincia de Salamanca y su relación con la zona de procedencia de las muestras y el punto de recogida de las mismas. MÉTODO: Estudio epidemiológico transversal, observacional y descriptivo. Se han estudiado aguas procedentes de redes de abastecimiento, fuentes, manantiales, pozos, ríos, riveras y lagunas de la provincia de Salamanca, analizándose los contenidos de plomo, cadmio, zinc y arsénico de 180 muestras, mediante espectroscopía de absorción atómica. Se han comparado los niveles de contaminación por los cuatro elementos de las muestras de agua entre las cuatro unidades comarcales de la provincia. Se han comparado los niveles de contaminación por los cuatro elementos entre las aguas procedentes de redes de abastecimiento y aquellas muestras de pozos, fuentes, manantiales y aguas de superficie. RESULTADOS: Los resultados indican que un 56% de las muestras analizadas superan las concentraciones máximas admisibles de cadmio, y un 28% del total de muestras analizadas supera las concentraciones máximas admisibles de plomo, según la legislación vigente presentando niveles tolerables de zinc y arsénico. No se han observado diferencias importantes en el grado de contaminación de las aguas por los elementos estudiados entre las cuatro unidades comarcales de la provincia. No se han observado diferencias en los niveles de contaminación por los cuatro elementos entre las aguas procedentes de redes de abastecimientos y aquellas muestras de pozos, fuentes, manantiales y aguas de superficie. CONCLUSIONES: Los resultados sugieren que las aguas de la provincia de Salamanca presentan de forma "natural" altos contenidos de cadmio y plomo, probablemente debido a las características geológicas del terreno.

  3. [R_Arnedo_SanMiguel] Documentación geométrica de las excavaciones arqueológicas del Cerro de San Miguel (Arnedo, La Rioja)

    OpenAIRE

    2007-01-01

    [ES] El cerro de San Miguel de Arnedo alberga un importante asentamiento plenamente adscrito a la cultura celtibérica. Los restos documentados corresponden a dos conjuntos de viviendas y una estructura defensiva compuesta por un foso y restos de muralla. La documentación se ha realizado mediante estación total. Además, la muralla se ha documentado mediante fotogrametría estereoscópica. [EN] San Miguel’s hill houses an important archaeological site which dates back to the Celtiberian cul...

  4. IMPACTO EN AFLUENTES DEL RÍO PILCOMAYO POR CONTAMINANTES ADICIONALES DE DRENAJE ÁCIDO DE MINAS DESDE CERRO RICO, POTOSÍ-BOLIVIA

    OpenAIRE

    William H.J. Strosnider; Freddy S. Llanos; Cristina E. Marcillo; Ruben R. Callapa; Robert W. Nairn

    2014-01-01

    La minería intensiva y el procesamiento del cuerpo mineralizado del Cerro Rico de Potosí (Bolivia) ha ocurrido desde 1545. Para avanzar la investigación sobre descargas de drenaje acido de minas (DAM) y su conexión a la contaminación río abajo, se generaron datos en dos muestreos durante la temporada más extrema de lluvia y sequía. Las concentraciones en el DAM y arroyos receptores de Ag, B, Ba, Mo, Sb, Se, Sn, y V fueron superiores a los límites de descarga permitidos por la legislación Boli...

  5. Chemical and mineralogical analyses of a weathering mantle developing on peridotite of the mining area for nickel in Cerro Matoso, Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, C.M.; Fabris, J.D. [Departamento de Quimica, UFMG (Brazil)], E-mail: claudiag@dedalus.lcc.ufmg.br, E-mail: fabris@dedalus.lcc.ufmg.br; Pacheco Serrano, W.A. [Departamento de Fisica (Colombia)], E-mail: wpacheco@donato.uptc.edu.co

    1999-11-15

    Four samples were collected at several depths in a weathering mantle developing on peridotite, found in a mining area for nickel of Cerro Matoso, about 20 km southwest of Monte Libano, Department of Cordoba, Colombia. Samples represent the main stratigraphy of the mantle. Powder X-ray diffractometry, RT Moessbauer spectroscopy, saturation magnetization measurements and conventional chemical analysis on the whole and chemically treated samples, and on some of their magnetic extracts, were used to give some details of the main occurring mineralogical phases in the mantle, particular of the magnetic iron oxides.

  6. Tecnología, subsistencia y cronología del sitio El Cerro, Departamento de Río Negro,Uruguaya

    OpenAIRE

    Gascue, Andrés; Loponte, Daniel M.; Moreno, Federica; Bortolotto, Noelia; Rodríguez, Ximena; Figueiro, Gonzalo; Teixeira, Franco; de Acosta, Alejandro

    2016-01-01

    En este trabajo se efectúa una revisión de los materiales obtenidos en El Cerro, excavado por Boretto y colaboradores en la segunda mitad del siglo pasado. El sitio se ubica sobre una suave colina natural en la margen derecha del Río Negro (República Oriental del Uruguay). La estratigrafía observada en sondeos recientemente efectuados en el sitio, indican que se trata de una elevación natural constituida por un albardón de arena edafizada. El conjunto arqueológico fue generado por grupos de c...

  7. Procesos históricos y ambientales en Cerro de San Pedro, San Luis Potosí, México, 1948-1997

    OpenAIRE

    Paula Andrea Martínez Chaves; Alexander Betancourt Mendieta; Miguel Nicolás Caretta; Miguel Aguilar Robledo

    2010-01-01

    Los estudios sobre el municipio Cerro de San Pedro enfatizan la continuidad ambiental aparente que estimula la minería; sin embargo, esta lectura subvalora otras dinámicas que ocurren en la zona. Con base en observaciones directas de trabajo en campo, para realizar análisis de coberturas vegetales, entrevistas con los habitantes de la zona, revisión de cartografía e investigación de archivo, el presente trabajo muestra procesos como la explotación de recursos vegetales y el pastoreo, como act...

  8. Catálogo de los puentes proyectados por Jules Sagebien en la provincia de Matanzas.

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    Luis R. González Arestuche

    2014-01-01

    Full Text Available Esta investigación recopila en documento único, el mejor quehacer de uno de los principales forjadores de Matanzas como ciudad y del desarrollo industrial inicial, alcanzado en el siglo XIX, para la demarcación. El respeto hacia la conservación y el rescate del patrimonio construido en la actual provincia homónima, por sus altísimos valores: histórico, cultural y tecnológico, considera la necesidad del conocimiento ciudadano sobre la actividad del francés Jules Sagebien Tavernier. Desde el año 2009 diferentes instituciones y asociaciones promueven, desde Francia y aquí en Cuba, el estudio de sus realizaciones. Este trabajo pretende ir más allá de las observaciones anteriores, ya que los autores logran crear un catálogo, referido a la ingeniería de puentes desarrollada por él, que tuvo su máxima expresión en la propia ciudad de Matanzas y en los diferentes ramales ferroviarios que diseñó; obras todas ejecutadas en un tiempo que hoy parece imposible de alcanzar.

  9. Pueblos indígenas, Estado y Territorio en tiempos interculturales en la provincia de Salta

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    Mariana Andrea Schmidt

    2011-12-01

    Full Text Available La configuración del Estado argentino hacia fines del siglo XIX y principios del XX tuvo como uno de sus móviles principales la eliminación, asimilación e invisibilización de los pueblos indígenas. En las últimas décadas del siglo XX, se ha pasado de una política de invisibilización y homogeneización a otra de visibilización y reconocimiento de la diversidad cultural, promoviéndose la diversidad territorial, cultural y lingüística acallada durante décadas. El objetivo del presente artículo es indagar en las características asumidas por estos procesos en la provincia de Salta. Partiendo de considerar al Chaco salteño como territorio históricamente imaginado como indígena, interesa pensar cómo juegan estos imaginarios territoriales a la hora de diseñar e implementar políticas públicas para este territorio y su población.

  10. Notas sobre joyería tradicional en la provincia de Madrid

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    León Fernández, Marcos

    1996-12-01

    Full Text Available This article deals with peasant jewellery from the province of Madrid (Spain in the eighteenth and nineteenth centuries, especially those pieces closely related to the regional costume. They have been classified according to «use» «form» and «name». Examples from inventories of the period are provided. The study is based on fieldwork and inventories of the time and is viewed as a first approach or general outlook into the subject.El presente artículo pretende, a través de un primer muestreo, ofrecer una visión general aproximada de la joyería tradicional en la provincia de Madrid —especialmente aquellas piezas relacionadas con la indumentaria—, a partir de los datos obtenidos de los inventarios de los siglos XVIII y XIX y del trabajo de campo. Las piezas se ordenan según su uso, forma y denominación, tratando ele hacer coincidir estos tres aspectos cuando ello es posible.

  11. Revolución y liberalismo en la provincia de Veracruz, 1812-1821

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    Ortiz Escamilla, Juan

    2002-08-01

    Full Text Available This article studies the insurrection movement in the province of Veracruz, with especial emphasis on the diversity of actors in a region which was both ethnically heterogeneous and very uneven from a geographical point of view. The different phases of the war, and their relation with the creation of constitutional municipalities provided for in the Cadiz Constitution, as well as the breaking down of the political hierarchy of the different territories, are described.

    Se estudia aquí el desarrollo de la insurgencia en la provincia de Veracruz, poniendo especialmente el acento en la diversidad de los actores de una región geográficamente muy variada y étnicamente heterogénea. Se describen las diferentes fases de la guerra y su relación con la creación de ayuntamientos constitucionales previstos por la Constitución de Cádiz, así como la desintegración de la jerarquía política de los territorios que ésta provoca.

  12. Cuatro propuestas educativas de consumo responsable del tiempo extraescolar en la provincia de Burgos.

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    Dolores Fernández Malanda

    2012-01-01

    Full Text Available Presentamos en este artículo cuatro propuestas formativas llevadas a cabo durante los tiempos curriculares y extracurriculares en algunos centros escolares de la provincia de Burgos. Entre sus fines destacan objetivos de los documentos marco de la Unión Europea para impulsar la tolerancia y la solidaridad en los espacios de educación formal. Estas propuestas son: a talleres de Educación en Derechos Humanos de la ONG Amnistía Internacional, sección Burgos; b Programa “Por los Buenos Tratos” de la asociación Acciónenred, de Burgos; c los programas de Cruz Roja Juventud Burgos, y d programas de Ecoauditorias (La Escuela Sesostiene del Ayuntamiento de Burgos, Concejalía de Medio Ambiente.--------------------------------------------------------------------In this article we present four learning proposals that have bee implemented during both curricular and extracurricular periods in different schools in the province of Burgos. The goals of these proposals were based on propositions put forward by the European Union aimed towards developing tolerance and solidarity within formal educational contexts.These learning proposals were the following: a Human Rights education workshops conducted by Amnesty International in Burgos; b The “Por los Buenos Tratos” Program implemented by the Association Acciónenred in Burgos; c programs developed by the Youth Section of the Red Cross in Burgos, and d Ecoaudits (Sustainable Schools programs developed by the Environment Department of the Burgos City Council.

  13. Las escuelas articuladas de la provincia de Buenos Aires y la fragmentación social

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    Victoria Gessaghi

    2004-07-01

    Full Text Available El siguiente artículo pretende introducir algunos avances correspondientes a la investigación que vengo desarrollando en el marco de mi tesis de licenciatura. La misma analiza la reconfiguración de los circuitos de escolarización tras la reforma que tuvo lugar en nuestro país para la implementación de la Ley Federal de Educación, durante la década del '90, en la Provincia de Buenos Aires. Se buscará indagar acerca del proceso mediante el cual se construyeron los acuerdos para la instrumentación de la articulación institucional entre las ex escuelas primarias y las ex escuelas medias. De esta manera intentaremos describir los procesos de diferenciación entre las escuelas, y las diversas manifestaciones que asume la cada vez más creciente fragmentación social.This paper will introduce some of the results of my research project on the formation of school circuits during the argentine's education reform to implement the Education Federal Law in the 90's. I will look into the agreements done by school directors and supervisors in order to instrument the articulation between primary schools and secondary schools. I will try to describe diffenciation processes among schools and the different forms of the growing social fragmentation.

  14. BIOMASA EN PLANTACIONES DE Eucalyptus viminalis Labill. DE LA PROVINCIA DE BUENOS AIRES, ARGENTINA

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    Paula Ferrere

    2008-01-01

    Full Text Available El presente trabajo se desarrolló en el oeste de la provincia de Buenos Aires, Argentina con el objetivo de ajustar funciones de biomasa de árboles individuales y determinar la biomasa en diferentes compartimientos de la planta y el sotobosque. Se identificaron rodales de Eucalyptus viminalis Labill. cuyas edades oscilaron entre 4 y 14 años. Se apearon 21 árboles con diámetros entre 9,2 y 32,5 cm. Se desarrollaron regresiones simples y múltiples y se estimó el volumen, la biomasa en ramas, hojas y fuste. Las ecuaciones de volumen de mejor comportamiento son basadas en modelos lineales en su forma normal, y el modelo más adecuado fue el que incorporó al d2 (R2 = 0,92. Para la estimación de la biomasa en hojas, ramas, copa y fuste se recomienda los modelos ln-ln que consideran el d y h o solo el d. El componente de la biomasa en hojas presentó una estimación más débil. La distribución de la biomasa en los individuos sigue el patrón de desarrollo que se encuentra en la bibliografía. La proporción de la biomasa en la copa disminuye con la edad, contrariamente a lo sucedido con el fuste.

  15. Georreferenciamiento: una herramienta utilizada para analizar y diagnosticar sitios contaminados en la provincia de Jujuy- Argentina

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    MA Ruggeri

    2009-01-01

    Full Text Available El análisis georreferencial se ha impuesto en los últimos años en la investigación científica como un elemento esencial de las Evaluaciones Integrales sobre el Riesgo, sobre todo debido a la disponibilidad de software de procesamiento de datos y Sistemas de Información Geográfica (GIS. Dos trabajos de investigación realizados en dos localidades distintas de la provincia de Jujuy, Argentina fueron georreferenciados lo que permitió su reconocimiento y tipificación como sitios contaminados. El primer elemento químico analizado georreferencialmente fue el arsénico (As. Para ello se cuantificó su presencia natural en aguas de distintas cuencas acuíferas de la provincia de Jujuy. El resultado de esta primera investigación fue la identificación de elevados niveles de arsénico total en aguas superficiales y subterráneas de determinadas cuencas de la provincia. El segundo elemento georreferenciado fue el plomo, en el marco de una Evaluación Integral en la localidad de Abra Pampa, Jujuy, lugar de asentamiento de una fundición de plomo. En esta investigación se cuantificó la presencia de Pb en sangre de niños pobladores del lugar. Como etapa integral de ambas investigaciones se realizó el georreferenciamiento de cada uno de los tóxicos en ambas matrices. Se georreferenció, en la primera investigación un total de 225 puntos de muestreo de agua de 3 cuencas hídricas que recorren el territorio provincial y, en la segunda investigación, 233 plumbemias de una población infantil que habita en las cercanías de la fundición. Como resultado final de este procesamiento de datos se obtuvieron dos mapas temáticos que permitieron tener una percepción globalespacial sobre las distintas situaciones abordadas. En cada uno se pudo visualizar, entre otros, la variación del contenido del tóxico respecto a la distancia de las zonas contaminantes. Se determinó la zona geológicamente contaminada por As en Jujuy correspondiendo

  16. Por mano propia. La justicia policial de la provincia de Buenos Aires en el primer peronismo

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    Osvaldo Barreneche

    2009-11-01

    Full Text Available La sanción del Código Penal Policial fue una pieza importante en el andamiaje jurídico por el cual el primer gobierno peronista procuró afianzar la profesionalización y disciplinamiento de las fuerzas de seguridad en las distintas jurisdicciones del país. Así, se organizó y se puso en marcha una nueva rama de la justicia bonaerense, paralela a la ordinaria, integrada completamente por policías retirados y en actividad, que se ocupó de los casos penales donde estuviesen implicados uno o más policías. Este trabajo analiza dicha experiencia, basándose en los casos sumariados y resueltos por la Justicia Policial mientras existió. En primer lugar se pone en contexto los fundamentos y propósitos que guiaron al peronismo para impulsar una justicia 'uniformada' que se ocupase de los excesos y falta a los deberes de los funcionarios policiales a nivel penal y administrativo. Luego se estudia su aplicación concreta en la provincia de Buenos Aires, indagando sobre los casos juzgados, su tratamiento, los actores, los fallos y los fines políticos perseguidos por esta justicia por y para policías

  17. Leptospirosis en niños de la Provincia de Ciego de Ávila, Cuba

    Directory of Open Access Journals (Sweden)

    Suárez Hernández Miguel

    1999-01-01

    Full Text Available Se analiza la morbilidad por leptospirosis humana en niños de la Provincia de Ciego de Ávila, Cuba en el período de 1982 a 1995 donde se diagnosticaron 253 casos. Los casos aislados predominaron sobre los presentados en brotes. Con respecto a los grupos de edades predominó el de 10 a 14 años seguido del grupo de 5 a 9 años. Fue más frecuente el sexo masculino que el femenino, en esta etapa se presentó un fallecido. En la presentación de casos por meses se reporta un incremento de enfermos a partir del mes de julio, siendo agosto, octubre y noviembre los meses de mayor incidencia; los síntomas y signos de mayor frecuencia fueron fiebre, cefalea y mialgia; el 92% de los casos eran anictéricos. Los diagnósticos presuntivos más planteados fueron síndrome febril agudo, leptospirosis y meningoencefalitis viral. En las posibles fuentes de infección el contacto con terrenos bajos y el baño en fuentes de agua dulce, presentaron el mayor número de casos. En lo referente al diagnóstico 162 se diagnosticaron por microaglutinación y 91 por prueba hemolítica. En la primera los serogrupos Canícola Australis y Pomona tuvieron el mayor reporte.

  18. Recursos turísticos y actividades del sector en la Provincia de Granada

    Directory of Open Access Journals (Sweden)

    Francisco Villegas

    2000-01-01

    Full Text Available El presente trabajo pretende hacer una doble contribución respecto al análisis geográfico de la actividad turística granadina: en primer lugar, se valora ésta a tenor de los resultados macroeconómicos y de las magnitudes sobre oferta y demanda, mediante distintos indicadores, todo ello precedido de una breve reseña sobre los antecedentes y evolución de esta importante actividad socioeconómica. La segunda parte del artículo se centra en una aproximación a la distribución geográfica de la actividad en la provincia, a partir de la demarcación de ámbitos turísticos, pero introduciendo reflexiones acerca de la posible diversificación de los actualmente consolidados y potenciación de los que, conteniendo recursos de índole cultural, ambiental, paisajística, y/o deportiva, no están siendo aprovechados para generar economías de escala del sector turístico. A este respecto, se aportan tablas-inventario, de elaboración propia, donde se señalan diversas valoraciones para los espacios significados por su carácter turístico consolidado o que cuentan con estimables posibilidades.

  19. Helechos epífitos de Alsophila setosa (Cyatheaceae, Pteridophyta en la provincia de Misiones, Argentina

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    Gonzalo Javier Marquez

    2012-12-01

    Full Text Available Los cáudices de los helechos arborescentes presentan condiciones particulares que favorecen el establecimiento de epífitas. En este trabajo se estudiaron los helechos que crecen sobre Alsophila setosa Kaulf. (Cyatheaceae, Pteridophyta en la provincia de Misiones. Se encontraron 21 especies, que se agruparon en 10 géneros y 5 familias. La familia más diversa fue Polypodiaceae, con 8 especies, y los géneros mejor representados fueron Asplenium (6 y Pecluma (4. Se presenta una clave para la identificación de los taxa involucrados. La cantidad de especies epífitas encontradas sugiere que Alsophila setosa juega un papel importante como reservorio de biodiversidad en el bosque atlántico.Epiphyte ferns on Alsophila setosa (Cyatheaceae, Pteridophyta from Misiones province, Argentina. Trunks of tree ferns offer especially distinctive substrates to support epiphytes. In this paper, ferns that grow on Alsophila setosa Kaulf. from Misiones were studied. A total of 21 species, from 10 genera and 5 families, were recorded. Polypodiaceae (8 had greater specific diversity. Richest genera were Asplenium (6 and Pecluma (4. A key is presented to identify the taxa involved. The high epiphytic diversity found suggests that Alsophila setosa plays an important role as a biodiversity reservoir in the Atlantic forest.

  20. Educando al buen ciudadano. Las guardias nacionales en la Provincia de Cartagena, Colombia, 1832-1857

    Directory of Open Access Journals (Sweden)

    Flórez Bolívar, Roicer

    2010-12-01

    Full Text Available This article analyzes the role played by the National Guard in the Province of Cartagena in training and education of citizens between 1832 and 1857. Also, determine the social sectors that made up this institution. It supports the idea that members of this Guard, military service became a form of more direct political intervention, because during that century citizenship is closely associated with participation in the militias and because active citizen status implies the right and duty to belong to it. Similarly, the National Guard became an instrument of sociability and political pedagogy.

    Este artículo analiza el papel desempeñado por la Guardia Nacional en la Provincia de Cartagena en la formación y educación de los ciudadanos entre 1832 y 1857. Asimismo, se determinan los sectores sociales que integraban esta institución. Se sostiene la idea de que para sus miembros, el servicio de las armas se convirtió en una forma de intervención política más directa, ya que durante ese siglo la ciudadanía se asociaba estrechamente con la participación en las milicias y debido a que la condición de ciudadano activo implicaba el derecho y el deber de pertenecer a ella. De igual forma, la Guardia Nacional se convirtió en un instrumento de sociabilidad y pedagogía política.

  1. Gaseous equilibrium in sector CP IV of the Cerro Prieto, B.C. Mexico geothermal field; Equilibrio gaseoso en el sector CP IV del campo geotermico Cerro Prieto, B.C., Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Barragan Reyes, Rosa Maria; Arellano Gomez, Victor Manuel; Portugal Marin, Enrique [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); De Leon Vivar, Jesus [Comision Federal de Electricidad, Campo Geotermico Cerro Prieto, Cerro Prieto, B. C. (Mexico)

    2007-07-01

    Sector CP IV is located in the NE portion of the Cerrro Prieto geothermal field. The wells of this zone produce two-phase fluids, with different characteristics as far as their steam fraction content; in the central part and towards the NW the fluids are of dominant liquid type whereas towards the E and the S, the fluid contains a relatively higher steam fraction. The results of gaseous equilibrium FT- HSH3 showed that the fluids in the deposit are at temperatures between 275 Celsius degrees and 310 Celsius degrees and contain steam fractions between 0.01 and 0.5. The data found for the natural state are aligned in a tendency defined in the diagram FT- HSH3, that suggest the wells receive different proportions from preexisting steam in the deposit, which are mixed with the liquid phase to produce the observed discharges. The present data, besides showing the presence of deposit steam, also indicates the entrance of lower temperature fluid in the central part of sector CP IV. [Spanish] El sector CP IV se localiza en la porcion NE del campo geotermico Cerro Prieto. Los pozos de esta zona producen fluidos bifasicos, con diferentes caracteristicas en cuanto a su contenido de fraccion de vapor: en la parte central y hacia el NW los fluidos son de tipo liquido dominante mientras que hacia el E y hacia el S, el fluido contiene una fraccion relativamente alta de vapor. Los resultados de equilibrio gaseoso FT-HSH3 mostraron que los fluidos en el yacimiento se encuentran a temperaturas de entre 275 grados Celsius y 310 grados Celsius y contienen fracciones de vapor de entre -.01 y .5. Los datos hallados para el estado natural se alinean en una tendencia definida en el diagrama FT-HSH3, que sugiere que los pozos reciben diferentes proporciones de vapor pre-existente en el yacimiento, que se mezclan con fase liquida para producir las descargas que se observan. Los datos actuales, ademas de mostrar la presencia de vapor de yacimiento, tambien indican la entrada de fluidos de

  2. Geología de la Formación Cerro Negro (Cretácico en Isla Livingston: aportes a su geocronología y contenido paleontológico Geology of the Cerro Negro Formation (Cretaceous in Livingston Island: contributions to its geochronology and paleontological content

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    C.A. Parica

    2007-12-01

    Full Text Available La península Byers se encuentra en el extremo occidental de la isla Livingston, archipiélago de las islas Shetland del Sur. Geológicamente está caracterizada por depósitos marinos, continentales y volcanismo cretácico-terciario que son incluidos en la Formación Cerro Negro de la sección superior del Grupo Byers. Las secuencias magmáticas han sido divididas en dos grupos principales, el primero comprende a las rocas piroclásticas y reúne cinco unidades con un importante desarrollo y distribución en el área. Por su parte, el segundo grupo comprende lavas e intrusivos aflorantes en cerros Don Carlos, Usnea (Usnea Plug, Chester (Chester Cone, Sealer (Sealer Hill y Negro (Negro Hill. Los términos sedimentarios incluyen conglomerados, areniscas y pelitas, de color gris verdoso con estratificación entrecruzada (tanto tabular como en artesa, raramente estratos macizos, laminación horizontal (en algunos casos de naturaleza rítmica, y estructuras de deformación sinsedimentaria (principalmente laminación convoluta. Se propone un ambiente fluvial de depositación, con canales dominados por carga de lecho y barras areno-gravosas bien desarrolladas. En lo que corresponde al sector de planicie de inundación, predominó allí la depositación de material limo-arcilloso por corrientes tractivas débiles durante las crecientes. En las áreas deprimidas de las planicies habría tenido lugar la formación de cuerpos de aguas de poca profundidad en los que se vió favorecida la preservación de la macro y microflora. En las nuevas localidades fosilíferas de península Byers, Domo Rotch (Rotch Dome, cerro Don Carlos, Lomada de las Plantas y 904, ha sido reconocida la presencia de las especies: Araucarites sp., Archangelskya furcata Herbst, Cladophlebis sp., Dictyozamites sp., Elatocladus sp, Phyllopteroides sp., Pseudoctenis sp., Ptyllophyllum menendezii Cantrill, Sphenopteris sp., Eocyathea remesaliae Césari, Sergioa austrina Césari y

  3. 2666, de Roberto Bolaño, e Valsa com Bashir, de Ari Folman: o que não é visível deve ser escrito? O que não é “escrevível” deve ser mostrado?

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    Maria Aparecida Oliveira Carvalho

    2014-08-01

    Full Text Available Este ensaio apresenta uma leitura que aproxima de dois tipos de texto, um literário – 2666, de Roberto Bolaño – e um fílmico – Valsa com Bashir, de Ari Folman –, cujos temas centrais são a linguagem da violência e do delito. Ambos em regiões de intenso conflito: a fronteira do México com os Estados Unidos e a região do Oriente Médio.

  4. TECNOLOGÍA Y SUBSISTENCIA EN EL SITIO ARQUEOLÓGICO CERRO TAPERA VÁZQUEZ (PARQUE NACIONAL PRE-DELTA, REPÚBLICA ARGENTINA

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    Mariano Bonomo

    2014-10-01

    Full Text Available In this paper the results of the studies carried out on ceramic and bone materials recorded at Cerro Tapera Vázquez site (Argentinean Northeast are presented. Taxonomic, anatomic and taphonomic studies of bone assemblages and technological-decorative analysis and refitting of pottery were undertaken. The site is located on a mound next to El Ceibo Creek, where 16 m2 were excavated in 2008. Abundant smooth, incised and modeled pottery (handles and zoomorphic appendages and numerous bones remains of Myocastor coypus (most frequent taxon, Blastocerus dichotomus, Ozotoceros bezoarticus, Cavia aperea, Leopardus geoffroyi, Lycalopex gymnocercus, Hydrochaeris hydrochaeris, birds and fish (Siluriformes and Characiformes were recorded. Except Cavia aperea rodent and Dusicyon gimnocercus fox, all taxa show evidence of anthropic modification (cut marks, fresh fractures and burning. Two radiocarbon dates were obtained: 650 and 520 yrs. BP. The results reached in this study lead to the conclusion that the pre-Hispanic populations that occupied Cerro Tapera Vázquez by the end of the Late Holocene were riverine canoe peoples, with complex ceramic technology and subsistence based on hunting of coypu, capybara and cervids, fishing and small-scale horticulture.

  5. Geochemistry of the Neoproterozoic (800-767 Ma) Cerro Bori orthogneisses, Dom Feliciano Belt in Uruguay: tectonic evolution of an ancient continental arc

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    Lenz, C.; Porcher, C. C.; Fernandes, L. A. D.; Masquelin, H.; Koester, E.; Conceição, R. V.

    2013-10-01

    The Cerro Bori orthogneisses, crystallized between ca. 800 and 767 Ma, are composed of a sequence of mafic gneisses, with dioritic-gabbroic and dioritic composition tectonically interleaved with a sequence of tonalitic and granodioritic gneisses. These rocks intruded the Chafalote paragneisses (metapelites, semipelites, carbonate and mafic rocks) and they were metamorphosed of high P-T conditions at ca. 676-654 Ma. This paper presents the first major and trace geochemical signatures, as well as Sm and Pb isotopic composition for the Cerro Bori orthogneisses, which allow distinguishing three different groups of rocks. Type I rocks are mafic gneisses with tholeiitic affinity, whereas the Type II rocks are tonalitic and granodioritic gneisses with calc-alkaline affinity. The third type is composed of biotite-rich mafic gneisses with potassic and ultrapotassic affinities. All the three types of rocks have negative ℰND values (between -2.12 and -6.67) and old TDM ages (between 1.2 and 2.0 Ga), indicating that the process of crustal assimilation/contamination was an important process, together with fractional crystallization. An continental arc tectonic setting is suggested to this association of rocks between 800 and 767 Ma. This subduction suggests the existence of an ocean between Rio de La Plata and adjacent cratons during the break up of the Rodinia supercontinent.

  6. ANALISIS DEL CO-TRATAMIENTO PASIVO DE AGUAS RESIDUALES MUNICIPALES Y DRENAJE ACIDO DE MINAS EN CERRO RICO DE POTOSÍ, BOLIVIA

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    William H.J. Strosnider

    2015-01-01

    Full Text Available El drenaje acido de minas (DAM es un problema a nivel mundial. El co-tratamiento pasivo de DAM con aguas residuales municipales (ARM es una manera efectiva y de bajo costo que utiliza los nutrientes de ARM para tratar las concentraciones de metales y sulfato en DAM. Cerro Rico de Potosí, Bolivia es una de las grandes ciudades mineras en el mundo que tiene muchos problemas con el DAM. El objetivo de este estudio fue determinar velocidades de reacción de Al, Fe, Mn, Zn, y otros metales en DAM provenientes de un flujo de agua en Cerro Rico usando un sistema reactor de tres etapas. El DAM tenía un pH de 3.58, acidez de 1080 mg/L equivalente a CaCO3 conteniendo concentraciones de 12, 68, 17, y 550 mg/L de Al, Fe, Mn y Zn respectivamente. Las velocidades de reacción de Al, Fe, Mn y Zn fueron de 1.43, 2.09, 0.01 y 0.10 d-1, respectivamente.

  7. Edad, caracterización petrográfica y Geoquímica del Granitoide del Cerro Falkner, Neuquén

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    Sabrina Crosta

    2008-03-01

    Full Text Available El Cerro Falkner se halla constituido por rocas graníticas infrayacentes a las volcanitas de la Formación Ventana de edad paleógena. Dichos intrusivos son de composición granodiorítica, metaluminosos a peraluminosos, subalcalinos, con características de granitos de arco volcánico concordantes con otros granitoides del segmento norte de la Cordillera Patagónica Septentrional. La edad obtenida por el método K-Ar sobre anfíboles de composición tschermakítica (125 ± 20 Ma indica una edad mínima perteneciente al Cretácico inferior para la granodiorita del cerro Falkner, por lo que sería incorrecto utilizar la denominación Formación Los Machis (Cretácico superior para estas rocas. Esta edad, permite vincular las rocas graníticas del área de estudio con el volcanismo representado por el Grupo Divisadero de edad predominantemente cretácica inferior.

  8. Rock-magnetism and ore microscopy of the magnetite-apatite ore deposit from Cerro de Mercado, Mexico

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    Alva-Valdivia, L. M.; Goguitchaichvili, A.; Urrutia-Fucugauchi, J.; Caballero-Miranda, C.; Vivallo, W.

    2001-03-01

    Rock-magnetic and microscopic studies of the iron ores and associated igneous rocks in the Cerro de Mercado, Mexico, were carried out to determine the magnetic mineralogy and origin of natural remanent magnetization (NRM), related to the thermo-chemical processes due to hydrothermalism. Chemical remanent magnetization (CRM) seems to be present in most of investigated ore and wall rock samples, replacing completely or partially an original thermoremanent magnetization (TRM). Magnetite (or Ti-poor titanomagnetite) and hematite are commonly found in the ores. Although hematite may carry a stable CRM, no secondary components are detected above 580°, which probably attests that oxidation occurred soon enough after the extrusion and cooling of the ore-bearing magma. NRM polarities for most of the studied units are reverse. There is some scatter in the cleaned remanence directions of the ores, which may result from physical movement of the ores during faulting or mining, or from perturbation of the ambient field during remanence acquisition by inhomogeneous internal fields within these strongly magnetic ore deposits. The microscopy study under reflected light shows that the magnetic carriers are mainly titanomagnetite, with significant amounts of ilmenite-hematite minerals, and goethite-limonite resulting from alteration processes. Magmatic titanomagnetites, which are found in igneous rocks, show trellis, sandwich, and composite textures, which are compatible with high temperature (deuteric) oxy-exsolution processes. Hydrothermal alteration in ore deposits is mainly indicated by martitization in oxide minerals. Grain sizes range from a few microns to >100 mm, and possible magnetic state from single to multidomain, in agreement with hysteresis measurements. Thermal spectra, continuous susceptibility measurements, and IRM (isothermal remanent magnetization) acquisition suggest a predominance of spinels as magnetic carriers, most probably titanomagnetites with low

  9. Effect of artificial feeders on pollen loads of the hummingbirds of Cerro de la Muerte, Costa Rica.

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    Avalos, Gerardo; Soto, Alejandra; Alfaro, Willy

    2012-03-01

    Although sugar-water feeders are commonly used by enthusiasts to attract hummingbirds, little is known about how they affect hummingbird behavior and flower use. We studied the highland hummingbird assemblage of Cerro de La Muerte, Costa Rica, both at a site with permanent feeders (La Georgina Restaurant) and further from it. We examined how feeder use and monopolization affected seasonal changes in pollen loads during four sampling periods, including dry and wet seasons, from 2003-2005. We expected that species monopolizing the feeders would carry little or no pollen whatsoever, and would have pollen loads characterized by low floral diversity, in contrast with species less dependent on feeders. We obtained pollen samples from 183 individuals of four hummingbird species captured around the feeders using mist nets, which were compared with a pollen reference collection of plants with a pollination syndrome by hummingbirds. The same methods were implemented at a site 3km away from the feeders. Feeder usage was quantified by counting the number of times hummingbirds drank from the feeders in periods of 4min separated by 1min. The effects of hummingbird species and season on pollen load categories were assessed using a nominal logistic regression. The alpha species at the site, the Fiery-throated Hummingbird (Panterpe insignis), dominated the feeders during the dry season. Meanwhile, in the wet season, feeder usage was more evenly distributed across species, with the exception of the Volcano Hummingbird, Selasphorus flammula, which occupies the last place in the dominance hierarchy. Pollen loads of hummingbirds captured near feeders were low in abundance (more than 50% of captured individuals had zero or low pollen loads), and low in species richness (96% of the hummingbirds with pollen from only one plant genus, Centropogon). Overall pollen loads increased during the dry season coinciding with peaks in flower availability, although the majority of captured

  10. Recycling of water, carbon, and sulfur during subduction of serpentinites: A stable isotope study of Cerro del Almirez, Spain

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    Alt, Jeffrey C.; Garrido, Carlos J.; Shanks, Wayne C.; Turchyn, Alexandra; Padrón-Navarta, José Alberto; López Sánchez-Vizcaíno, Vicente; Gómez Pugnaire, María Teresa; Marchesi, Claudio

    2012-01-01

    We use the concentrations and isotope compositions of water, carbon, and sulfur in serpentinites and their dehydration products to trace the cycling of volatiles during subduction. Antigorite serpentinites from the Cerro del Almirez complex, Spain, contain 9–12 wt.% H2O and 910 ± 730 ppm sulfur, and have bulk δ18O values of 8.6 ± 0.4‰, δD = − 54 ± 5‰, and δ34S = 5.0‰, consistent with serpentinization at temperatures of ~ 200 °C by seawater hydrothermal fluids in a seafloor setting. The serpentinites were dehydrated to chlorite–harzburgite (olivine + orthopyroxene + chlorite) at 700 °C and 1.6–1.9 GPa during subduction metamorphism, resulting in loss of water, and sulfur. The chlorite–harzburgites contain 5.7 ± 1.9 wt.% H2O, and have bulk δ18O = 8.0 ± 0.9‰, and δD = − 77 ± 11‰. The rocks contain 650 ± 620 ppm sulfur having δ34S = 1.2‰. Dehydration of serpentinite resulted in loss of 5 wt.% H2O having δ18O = 8–10‰ and δD = − 27 to − 65‰, and loss of 260 ppm sulfur as sulfate, having δ34S = 14.5‰. The contents and δ13C of total carbon in the two rock types overlap, with a broad trend of decreasing carbon contents and δ13C from ~ 1300 to 200 ppm and − 9.6 to − 20.2‰. This reflects mixing between reduced carbon in the rocks (210 ppm, δ13C ≈ − 26‰) and seawater-derived carbonate (δ13C ≈ − 1‰). Our results indicate: 1) Serpentinized oceanic peridotites carry significant amounts of isotopically fractionated water, carbon and sulfur into subduction zones; 2) Subduction of serpentinites to high P and T results in loss of water, and sulfur, which can induce melting and contribute to 18O, D, and 34S enrichments and oxidation of the sub-arc mantle wedge; and 3) Isotopically fractionated water, carbon, and sulfur in serpentinite dehydration products are recycled deeper into the mantle where they can contribute to isotope heterogeneities and may be significant for volatile budgets of the deep Earth.

  11. APORTES PALEOBOTÁNICOS EN LA RECONSTRUCCIÓN DE PALEODIETAS. ANÁLISIS DE COPROLITOS DEL CERRO CASA DE PIEDRA, SANTA CRUZ/Palaeobotany contributions in palaeodiets reconstruction. Coprolites analysis of Cerro Casa de Piedra, Santa Cruz.

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    Ana Cecilia Martínez Tosto

    2012-11-01

    Full Text Available Los coprolitos son heces fósiles deshidratadas o mineralizadas que contienen inclusiones orgánicas e inorgánicas. El estudio de las inclusiones de origen vegetal de los coprolitos permite conocer los ítems vegetales consumidos por los organismos e inferir la estacionalidad en el uso del sitio. El objetivo de este trabajo es estudiar el contenido de polen y de microrrestos vegetales de un coprolito humano del sitio CCP7 relacionado a una capa arqueológica fechada en 8920±200 C14 (UGA 7383 años AP. El sitio CCP7 está ubicado en la provincia de Santa Cruz (Argentina en el ecotono bosque-estepa. Se realizaron los análisis polínicos y microhistológicos de los restos vegetales del coprolito. Se identificaron 13 tipos polínicos, tres de ellos pertenecientes a la vegetación del bosque y el resto a la estepa. Mediante el análisis microhistológico se identificaron las especies Azorella monanthos, Empetrum rubrum y Gaultheria mucronata. El análisis simultáneo de la información extraída de los datos palinológicos y de los microhistológicos mostró coincidencias parciales entre el contenido de polen y de restos vegetales, permitiendo reconstruir la porción vegetal de la paleodieta e inferir la época del año en que el hombre que dio origen al coprolito estuvo ocupando el sitio CCP7.   Abstract Coprolites are dehydrated or mineralized fossil feces containing organic and inorganic inclusions. The study of plant inclusions of coprolites allows knowing the vegetable items consumed by organisms and inferring the seasonality in the use of the site. This work aims at studying pollen and plant remains from a human coprolite in the CCP7 site related to an archaeological layer dated from around 8920±200 14C (UGA 7383 years BP. CCP7 is located in the province of Santa Cruz (Argentina within the forest-steppe ecotone. Pollen and microhistological analyses of coprolite plant remains were conducted. Thirteen pollen types were identified: three

  12. TUMOR PHYLLODES DE LA MAMA.CARACTERIZACIÓN EN LA PROVINCIA CIENFUEGOS.ESTUDIO DE 20 AÑOS

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    Lidia Torres Aja

    2007-01-01

    Full Text Available El tumor Phyllodes de la mama es poco frecuente. Tiene un origen fibroepitelial con potencial agresivo y representa el 0.3% a 0.4% de todos los tumores mamarios y el 2.5% a 3% de los tumores epiteliales de dicho órgano.Objetivo: Nuestro objetivo fundamental es caracterizar desde el punto de vista clínico patológico los tumores Phyllodes operados en la provincia de Cienfuegos durante 20 años.Tipo de estudio: descriptivo prospectivo observacional. Periodo evaluado: 20 años desde 1 de enero de 1987 hasta el 31 de diciembre del 2006. Universo: 57 pacientes.Métodos: para realizar nuestra investigación hemos seguido anualmente durante estos 20 años los casos operados en nuestra provincia, examinando personalmente los casos en consulta de Mastología antes de operarlos y siguiéndolo por consulta de operados durante más de 5 añosResultados fundamentales: como resultados fundamentales de nuestra investigación obtuvimos que se operaron en esos 20 años un total de 57 tumores Phyllodes, los cuales representaron el 2.9% del total de tumores fibroepiteliales de mama operados.Aunque el mayor número de casos se detectó en pacientes de más de 40 años, queremos resaltar que en este periodo se operaron los únicos tumores Phyllodes en niña y en adolescente reportados en nuestra provincia

  13. Sistema de salud pública y comunidades indígenas de la Provincia de Formosa

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    Cristina S. Mirassou

    2013-10-01

    Full Text Available Relato de la experiencia de la autora en el ejercicio de la medicina y la salud pública entre los aborígenes de la provincia de Formosa, Argentina; la experiencia cubre 34 años, 11 de los cuales la realizó en una pequeña comunidad Wichí ubicada en el extremo noroeste, lindante con la provincia de Salta, Bolivia y Paraguay. De los 530 162 habitantes de la provincia 43 358 (6.5% son pueblos originarios de las etnias Wichí, Qom, y Pilagá. Los problemas particulares de estas comunidades se deben a las distancias entre las comunidades y los servicios médicos regulares, y a las diferencias culturales. La situación mejoró en los últimos 30 años al facilitar y acercar los servicios médicos a las poblaciones, incorporar y mejorar la preparación de las parteras aborígenes, formar agentes sanitarios, auxiliares médicos y la mejora de las condiciones sociales en general. Los resultados más destacados fueron la disminución de los índices de mortalidad infantil, de la incidencia de tuberculosis, ninguna muerte por meningitis tuberculosa desde 1999. Es de importancia haber incorporado a la enseñanza los idiomas propios de las etnias y el manifiesto respeto a sus diferentes costumbres. Los cambios originaron nuevos riesgos: accidentes viales, alcoholismo en los jóvenes, obesidad, diabetes (antes no diagnosticada, y crisis de liderazgo en las comunidades.

  14. Las políticas hospitalarias peronistas: el caso de la provincia de Córdoba, Argentina (1946-1955

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    María Laura Rodríguez

    2013-01-01

    Full Text Available En este trabajo abordamos las transformaciones del universo hospitalario de la provincia de Córdoba durante el peronismo (1946-1955, a partir de la articulación entre fuentes primarias y aportes bibliográficos especializados. Para ello, abandonamos una tradición historiográfica dominante, tributaria de estudios de las dinámicas de la ciudad de Buenos Aires o de análisis de procesos que involucran, como principal protagonista, cuando no único, al nivel federal. Ponemos en perspectiva las limitaciones y los alcances en las intervenciones articuladas por las instancias estatales, nacional y provincial, en el plano local, y la institucionalidad formal entre nación y provincias a lo largo del período. Mostramos que los ritmos de las políticas públicas y sus resultados fueron radicalmente distintos a los vaivenes identificados al nivel de las políticas nacionales orientadas al ámbito hospitalario. En esta línea, consideramos las novedades e inercias materiales y las complejidades en el proceso de avance estatal, en relación a las tradicionales atribuciones que las asociaciones de beneficencia tenían sobre la administración de un vasto conjunto de nosocomios existentes en la provincia. Finalmente, buscamos dar cuenta de dicha especificidad, abordando un conjunto de variables ligadas a complejos procesos sociopolíticos de afirmación y consolidación de un peronismo local que nació sin la huella de la industrialización.

  15. Monitorieo de DDI en el noreste de la provincia de Chubut (2004

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    G. S. Zarza

    2008-06-01

    Full Text Available Un total de 668 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos ciudades del noreste de la provincia de Chubut: Puerto Madryn (493 niños y Trelew (175 niños. La edad de los escolares osciló entre 5 y 15 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-18, se tomó como única referencia la palpación de H. N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (161 de Puerto Madryn y 139 de Trelew. Se midió el contenido de yodo en 467 muestras de sal de consumo hogareño de Puerto Madryn y en 161 de Trelew. El examen palpatorio de los niños reveló la existencia de bocio grado 1 solamente. La prevalencia de bocio encontrada fue de 3,9 % en Puerto Madryn y de 2,9 % en Trelew. Los niveles de yoduria alcanzaron, en Puerto Madryn, una media de 188±95,8(DS μg/L y una mediana de 171 μg/L, al tiempo que en Trelew la media fue de 245±102,3 μg/L y la mediana de 196 μg/L. El contenido de yodo de las sales que aportaron los alumnos, si bien varió según la marca de sal utilizada, tuvieron un nivel relativamente adecuado de yodo en aquellas de consumo masivo. De esta manera, observamos que en la localidad de Puerto Madryn el promedio de yodo en la sal, tomada en conjunto, fue de 32,0 ± 10,9 mg/Kg, mientras que para Trelew fue de 31,5 ± 8,5 mg/Kg. Al analizar las concentraciones de yodo <15 mg/Kg, observamos que fue del 9 % en Puerto Madryn y del 5 % en Trelew. Teniendo en cuenta la línea de corte del 10 % que fija el ICCIDD (19 como valor óptimo, podemos observar que la situación de ambas poblaciones es satisfactoria. Concluimos que en estas dos ciudades del

  16. Monitoreo de DDI en la provincia de Neuquén (2004

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    J. A. Ferrería

    2009-03-01

    Full Text Available Un total de 235 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos localidades de la provincia de Neuquén: Junín de los Andes (186 niños y Chiuquillihuin (49 niños. La edad de los escolares osciló entre 5 y 15 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-20, se tomó como única referencia la palpación de H.N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (100 de Junín de los Andes y 36 de Chiuquillihuin. Se recolectaron 125 muestras de sal de consumo hogareño de Junín de los Andes y 33 de Chiuquillihuin, para medir su contenido en yodo. El examen palpatorio de los niños reveló la existencia de bocio grado 1 en 7 niños y grado 2 en una niña, todos ellos de Junín de los Andes. La prevalencia de bocio encontrada fue de 4,3% en Junín de los Andes y de 0% en Chiuquillihuin. Los niveles de yoduria alcanzaron, en Junín de los Andes, una media de 182±62(DSμg/L y una mediana de 168μg/L, al tiempo que en Chiuquillihuin la media fue de 212±101μg/L y la mediana de 176μg/L. El contenido de yodo de las sales, que aportaron los alumnos desde sus hogares, fue adecuado en la mayoría de las muestras. De esta manera, observamos que en la ciudad de Junín de los Andes el promedio de yodo en la sal, tomada en conjunto, fue de 34,6 ± 12,4 mg/Kg, mientras que para Chiuquillihuin fue de 23,6 ± 18,2 mg/Kg. Al analizar las concentraciones de yodo <15mg/ Kg, observamos que fue del 4,1% en Junín de los Andes y del 36,4% en Chiuquillihuin. Teniendo en cuenta la línea de corte del 10% que fija el ICCIDD (21 como valor óptimo, podemos observar que la situaci

  17. Monitoreo de DDI en la provincia de Santiago del Estero (2004

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    O. M. Abdala

    2008-09-01

    Full Text Available Un total de 675 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos ciudades de la provincia de Santiago del Estero: Santiago del Estero (360 niños y Frías (315 niños. La edad de los escolares osciló entre 6 y 12 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-19, se tomó como única referencia la palpación de H.N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (137 de Santiago del Estero y 154 de Frías. Se recolectaron 358 muestras de sal de consumo hogareño de Santiago del Estero y 299 de Frías, para medir su contenido en yodo. El examen palpatorio de los niños reveló la existencia de bocio grado 1 solamente. La prevalencia de bocio encontrada fue de 3,9 % en Santiago del Estero y de 2,9 % en Frías. Los niveles de yoduria alcanzaron, en Santiago del Estero, una media de 159 ± 147,3(DSμg/L y una mediana de 132,5μg/L, al tiempo que en Frías la media fue de 178 ± 147,3μg/L y la mediana de 136μg/L. El contenido de yodo de las sales que aportaron los alumnos, si bien varió significativamente según la marca de sal utilizada, tuvieron un nivel relativamente adecuado de yodo en aquellas de consumo masivo. De esta manera, observamos que en la ciudad de Santiago del Estero el promedio de yodo en la sal, tomada en conjunto, fue de 30,1 ± 8,0 mg/Kg, mientras que para Frías fue de 29,1 ± 10 mg/Kg. Al analizar las concentraciones de yodo <15mg/Kg, observamos que fue del 6,4 % en Santiago del Estero y del 12,5 % en Frías. Teniendo en cuenta la línea de corte del 10 % que fija el ICCIDD (20 como valor óptimo, podemos observar que la situación de

  18. Monitoreo de DDI en el Noroeste de la provincia de Santa Cruz

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    Olguita Vera

    2008-03-01

    Full Text Available Un total de 807 alumnos de escolaridad primaria, de ambos sexos, fue estudiado en este monitoreo de bocio endémico en dos localidades del noroeste de la provincia de Santa Cruz: Perito Moreno (407 niños y Los Antiguos (400 niños. La edad de los escolares osciló entre 6 y 15 años. La palpación tiroidea fue hecha por el conjunto de los médicos participantes. Sin embargo, con la finalidad de aunar criterios con lo realizado previamente (1-17, se tomó como única referencia la palpación de H.N., que se llevó a cabo en la totalidad de los niños estudiados. La definición del grado de bocio fue similar a la utilizada en los otros relevamientos (1. Se determinó la yoduria en muestras casuales de orina emitidas por los niños una vez que fueron palpados (149 de Perito Moreno y 88 de Los Antiguos. Se midió el contenido de yodo en 357 muestras de sal de consumo hogareño de Perito Moreno y en 329 de Los Antiguos. El examen palpatorio de los niños reveló la existencia de bocio grado 1 solamente. La prevalencia de bocio encontrada fue de 4,7 % en Perito Moreno y de 3,5 % en Los Antiguos. Los niveles de yoduria alcanzaron, en Perito Moreno, una media de 124±78,5(DSμg/L y una mediana de 107μg/L, al tiempo que en Los Antiguos la media fue de 175±96μg/L y la mediana de 165μg/L. El contenido de yodo de las sales que aportaron los alumnos, si bien varió según la marca de sal utilizada, tuvieron un nivel relativamente adecuado de yodo en aquellas de consumo masivo. De esta manera, observamos que en la localidad de Perito Moreno el promedio de yodo en la sal, tomada en conjunto, fue de 32,9 ± 9,5 mg/Kg, mientras que para Los Antiguos fue de 28,9 ± 9,6 mg/Kg. Al analizar las concentraciones de yodo <15mg/Kg, observamos que fue del 5,3 % en Perito Moreno y del 9,7% en Los Antiguos. Teniendo en cuenta la línea de corte del 10% que fija el ICCIDD (18 como valor óptimo, podemos observar que la situación de ambas poblaciones es satisfactoria

  19. La fecundidad de las provincias españolas en perspectiva histórica

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    Delgado, Margarita

    2009-12-01

    Full Text Available Spain participates in the same trends that are common to the rest of Western Europe followed by the course of fertility, while showing some peculiarities. The first transition of fertility in Spain was a fairly heterogeneous in terms of territorial, as the Spanish provinces show “tempos” quite distinct. The opposite happens with the second transition, which shows a great homogeneity, especially in regard to turning points in the index. The most influential factor in the decline of the total fertility rate until 1975 is marital fertility, as shown by the regression analysis. After 1975, it still shows that over half of the provinces (26 the general decline in fertility is explained by the decline of fertility within marriage, only in 9 the nuptiality explains the reduction in the overall rate, while in the rest the two factors work together.

    España participa de las mismas tendencias que son comunes al resto de Europa Occidental respecto al curso seguido por la fecundidad, si bien mostrando algunas peculiaridades. La primera transición de la fecundidad en España fue un proceso bastante heterogéneo desde el punto de vista territorial, pues las provincias españolas muestran “tempos” bastante diferenciados. Ocurre lo contrario con la segunda transición, la cual evidencia una gran homogeneidad, principalmente en lo que se refiere a los puntos de inflexión del índice. El factor más influyente en el descenso de la fecundidad general hasta 1975 es la fecundidad matrimonial, como han mostrado los análisis de regresión. Después de 1975, todavía se aprecia que para más de la mitad de las provincias (26 el descenso de la fecundidad general se explica por el descenso de la fecundidad dentro del matrimonio; solamente en 9 es la nupcialidad la que explica la reducción del índice general, mientras que en el resto operan ambos factores conjuntamente. [fr] L’Espagne présente les mêmes tendances communes au reste de l

  20. Estado nutricional infanto juvenil en seis provincias de Argentina: variación regional

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    Oyhenart, Evelia Edith

    2008-01-01

    Full Text Available En Argentina si bien se dispone de información de prevalencias de malnutrición (desnutrición y exceso de peso, existe dificultad en la comparación debido a que en la mayor parte de los casos hay disparidad en las técnicas y/o metodologías empleadas. El objetivo del presente trabajo es analizar el estado nutricional de la población infanto-juvenil de seis provincias: Buenos Aires (Brandsen y La Plata, Catamarca (Catamarca, Chubut (Puerto Madryn, Jujuy (San Salvador de Jujuy, La Pampa (Santa Rosa y Toay y Mendoza (General Alvear, empleando la misma metodología de estudio a fin de disponer de elementos diagnósticos que permitan su contrastación. Se midieron, en el período 2003-2005, peso corporal (kg y talla (cm en una muestra de 15011 escolares asistentes a 102 establecimientos escolares comprendidos entre los 3 y 18 años de edad. Con los datos obtenidos se analizaron los indicadores Talla/Edad, Peso/Talla, Peso/Edad e Indice de Masa Corporal (IMC. Los indicadores de desnutrición fueron comparados con los valores de referencia provenientes del NCHS y las prevalencias de baja talla para la edad (BT/E, bajo peso para la talla (BP/T y bajo peso para la edad (BP/E se calcularon tomando como punto de corte el percentilo 5 de dicha referencia. Para sobrepeso (S y obesidad (O se tomaron puntos de corte proyectados sobre los valores adultos de 25 y 30 Kg/m2 según edad y sexo propuestos por la referencia Internacional Obesity Task Force. A fin de disponer de información socio-ambiental de las zonas de estudio se analizaron indicadores demográficos, económicos, sociales y ambientales. Cuando fue posible, se utilizaron los datos provenientes del Censo Nacional de Población y Vivienda (CNPyV 2001, de las Encuestas Permanentes de Hogares (EPH, INDEC, de la Dirección de Estadísticas de Salud del Ministerio de Salud de la Nación (DEIS, MSyA y de otros organismos oficiales. Las prevalencias generales de desnutrición (BT/E, BP/T y BP/E y