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Search Results: 1 - 10 of 112410 matches for " Darío Trombotto Liaudat "
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Glaciares de escombros fósiles en el cordón Leleque, Noroeste del Chubut: significado paleoclimático y paleográfico
Lucas Ruiz,Darío Trombotto Liaudat
Revista de la Asociación Geológica Argentina , 2012,
Abstract: Este trabajo analiza la relación actual y pasada del ambiente periglacial y glaciario en los Andes de la Patagonia norte (41°- 43° L.S.). Es la primera vez que un estudio de estas características es llevado a cabo en esta región. A partir del análisis y caracterización de geoformas relacionadas con el permafrost de monta a y el ambiente glaciario, el análisis de las condiciones climáticas y el uso de análogos actuales, se presenta una reconstrucción paleogeográfica y paleoclimática del Cordón Leleque. El Cordón del Plata, en los Andes Centrales, con glaciares convencionales y glaciares de escombros, se utiliza como análogo actual de las condiciones pasadas en el Cordón Leleque. A partir de la ubicación espacial de las diferentes geoformas reconocidas en el Cordón Leleque se reconocieron cuatro grupos. Utilizando la relación entre la altura de la línea de equilibrio regional y la altura del límite de permafrost de monta a, se derivaron las variaciones climáticas necesarias que pudieron generar los diferentes grupos. Estos resultados son comparados con trabajos previos. Fossil rock glaciers in the Cordón Leleque, Northwestern Chubut: Palaeoclimatic and palaeogeographic significance. The aim of this work was to document the current and past relationships between periglacial and glacial environments in the Andes from northern Patagonia (41° - 43° S). From the analysis and characterization of landforms related to permafrost and mountain glacial environments in combination with the analysis of climatic conditions and the use of present analogs, we provide a paleogeographic and paleoclimatic reconstruction of the Cordon Leleque from the Last Glaciation until present. The Cordón del Plata, a mountain range in the Central Andes presently covered by glaciers and rock glaciers was used as the modern analogue for the environmental conditions in the Cordón Leleque. Paleoclimatic conditions for the Cordón Leleque were derived from the current climate conditions in the Cordón del Plata. We used the relationship between the altitude of the regional equilibrium line of glaciers and the altitude of mountain permafrost limit, derived from the total annual rainfall and mean annual air temperature, to analyze the paleoclimatic evolution in the study area. The landform chronology was used to derive the paleogeographic and paleoclimatic reconstruction of the Cordón Leleque.
Monitoreo del glaciar horcones inferior y sus termokarst, antes y durante el surge de 2003-2006: Andes centrales argentinos
María Gabriela Lenzano,Darío Trombotto Liaudat,Juan Carlos Leiva
Geoacta , 2012,
Abstract: En el presente trabajo se expone el monitoreo de termokarts glaciarios y su relación e interacción con los eventos surges ocurridos en el glaciar cubierto Horcones Inferior (GHI). Este glaciar se encuentra ubicado a los 32o 41'S y 69o 57'W, al pie de la pared sur del C° Aconcagua, Parque Provincial Aconcagua, en la Provincia de Mendoza, Argentina. El estudio fue llevado a cabo a través de la implementación de métodos indirectos de detección utilizando imágenes de los sensores Landsat y Aster durante el período 1997-2006. En el Glaciar Horcones Inferior "GHI", la superficie ocupada por los termokarst alcanza valores que varían entre el 4.3% y el 0% de la superficie total del glaciar, al finalizar un evento de surge. Las velocidades registradas en la superficie del glaciar cubierto arrojaron valores promedios entre 0.4 y 12 m/día. La metodología aplicada, con imágenes satelitales históricas, representa una herramienta fundamental para separar períodos de flujo glaciario catastróficos y no catastróficos. This work analyses the temporal evolution of thermokarst and their relationship to the surges in a reconstituted debris covered glacier. The glacier Horcones Inferior is located at Lat 32o 41' S and Long 69o 57' W in the Provincial Park Aconcagua, Mendoza, Argentina, on the foot of the Aconcagua massif. The study and monitoring of the thermokarst was carried out applying indirect methods using Landsat and Aster images from 1997-2006. Detected percentages of thermokarst, in relation to the total glacial area, showed that they varied between 4.3% to 0% at the end of the surge event. The registered speeds of the glacier -on the glacial surface- reached averages of between 0.4 and 12 m/d. This methodology, with historical images from archives, represents a fundamental tool to separate catastrophic and non-catastrophic glacial flow periods.
Satellite images and geodetic measurements applied to the monitoring of the Horcones Inferior Glacier, Mendoza, Argentina
Lenzano,M. Gabriela; Leiva,Juan Carlos; Trombotto,Darío; Lenzano,Luis;
Geoacta , 2011,
Abstract: this work analyzes the monitoring of the covered and regenerated horcones inferior glacier (hig) since the implementation of a semi-permanent gnss station (hiss) on its surface during the summer seasons of 2009 and 2010. the glacier is located at 32° 41's and 69° 57'w, at the foot of the south wall of mt. aconcagua, aconcagua provincial park, mendoza, argentina. the average velocities obtained from the hiss station were of 1.3 cm/d and 3.5 cm/d during the 2009 and 2010 seasons respectively. the data procured using satellite images during the last surges (1984 and 2003) gave average velocities for the hig front of 8.7 m/d for the first event and 11.5 m/d for the second one. these results allowed getting accurate and reliable movement tendency at the terminal part of the hig during the 1984-2010 period.
Satellite images and geodetic measurements applied to the monitoring of the Horcones Inferior Glacier, Mendoza, Argentina
M. Gabriela Lenzano,Juan Carlos Leiva,Darío Trombotto,Luis Lenzano
Geoacta , 2011,
Abstract: This work analyzes the monitoring of the covered and regenerated Horcones Inferior Glacier (HIG) since the implementation of a semi-permanent GNSS station (HISS) on its surface during the summer seasons of 2009 and 2010. The glacier is located at 32° 41's and 69° 57'w, at the foot of the south wall of Mt. Aconcagua, Aconcagua Provincial Park, Mendoza, Argentina. The average velocities obtained from the HISS station were of 1.3 cm/d and 3.5 cm/d during the 2009 and 2010 seasons respectively. The data procured using satellite images during the last surges (1984 and 2003) gave average velocities for the HIG front of 8.7 m/d for the first event and 11.5 m/d for the second one. These results allowed getting accurate and reliable movement tendency at the terminal part of the HIG during the 1984-2010 period. El presente trabajo realiza el monitoreo del glaciar Horcones Inferior, cubierto y regenerado a partir de la implementación de una estación GNSS semi-permanente (HISS), instalada sobre su superficie durante las temporadas de verano de 2009 y 2010 respectivamente. El glaciar se encuentra ubicado a los 32° 41's y 69° 57'w, al pie de la pared sur del C° Aconcagua, en el Parque Provincial Aconcagua, Mendoza, Argentina. La estación HISS registró valores de velocidades medias de 1.3 cm/d y 3.5 cm/d durante las temporadas de 2009 y 2010. Se utilizaron imágenes satelitales para el seguimiento del frente del glaciar durante los últimos surges (1984 y 2003), cuyas velocidades medias fueron de 8.7 m/d para el primero y de 11.5 m/d para el segundo evento. Estos resultados permitieron obtener de manera precisa y confiable la tendencia de movimiento de la parte terminal del GHI durante el periodo 1984-2010.
A GPR survey on degraded permafrost at Mesón San Juan, Mendonza, Argentina
Travassos, Jandyr de Menezes;Stael, Giovanni Chaves;Liaudat, Dario Trombotto;
Revista Brasileira de Geofísica , 2008, DOI: 10.1590/S0102-261X2008000400011
Abstract: this work presents some geophysical results obtained at mesón san juan located in the central andes (6,012 m, 33a°30' sand 69a°49' w), on the border of argentina and chile. the permafrost plateau (4,400 m) situated at the loot of the glacier is limited by recent moraines produced by cryogenic phenomena. the geophysical results revealed lateral differences in the dielectric characteristics of the subsurface due to varying water contents, allowing a zoning of the permafrost structure. we have compared the electrical permittivities in a semi-quantitative way through a trial-and-error migration procedure, taking advantage of the clutter present in the permafrost as seen in the fixed-offset data. in this way we were able to recognize a confined zone of relatively low phase velocity indicating higher porosity and water content. we interpret that zone as degraded permafrost , probably a result of the impact of global warming on the andean cryolithozone. that zone is likely a discharge channel linking a suprapermafrost to a subpermafrost aquifer, part of a laterally discontinuous near surface system not mapped in this work.
Propiedades insecticidas de la ceniza del complejo volcánico Puyehue-Cordón Caulle y su posible impacto ambiental: Insecticidal properties of ashes from the volcanic complex Puyehue-Caulle Range and their possible environmental impact
Buteler,Micaela; Stadler,Teodoro; López García,Guillermo P.; Lassa,María S.; Trombotto Liaudat,Dario; D'Adamo,Paola; Fernandez-Arhe,Valeria;
Revista de la Sociedad Entomol?3gica Argentina , 2011,
Abstract: this paper discusses the insecticidal effect of volcanic ash and its environmental impact, focusing on the ash accumulated as a result of the eruption of the volcanic complex puyehue- caulle range currently affecting an area of over 7.5 million hectares in the argentine patagonia. the chemical composition of ashes from the puyehue-caulle range was analyzed by eds showing that its major components are o, si, al, fe, na and k. laboratory bioassays using two species of insects as a biological model, found that the ashes thoroughly adhere to the insect body surface and are toxic to both species tested, when mixed into the substrate at low concentrations. susceptibility to ashes differs between the two species when tested in a seven day continuous exposure bioassay [cl99(oryzaephilus surinamensis l.) = 10.25 mg.g-1; cl99((tribolium castaneum (herbst)) = 4.96 mg.g-1]. these results agree with those reported in the literature on effects of volcanic eruptions and suggest that the impact of the ashes from the puyehue-caulle range volcanic complex on the insect community may be radical in the acute deposition phase, with substantial qualitative effects in the chronic phase of exposure. also, the recovery of populations affected by ash in desert areas where dry ash persists will be slower, and this will have tangible and long-term consequences for insect host plants, pollination and on the development of populations of vertebrate insectivores. by contrast, the presence of ash in humid regions will impact the ecosystem by the addition of nutrients, which in combination with water retention by the ash will lead to a qualitative and quantitative recovery of the populations under favorable conditions.
Rural Judges and Territorial Organization in Río de la Plata (17th to 19th Centuries)  [PDF]
Darío G. Barriera
Beijing Law Review (BLR) , 2016, DOI: 10.4236/blr.2016.71007
Abstract: This paper focuses on some traces of the challenge of the government of the dispersed population into a larger territory of the Spanish Monarchy throughout 16 - 19 century. The main subject is the creation and implementation of a minor justice: the “alcalde de la santa hermandad” (judge of the brotherhood). This rural judge appeared early at Santa Fe and Buenos Aires and plays like an articulator between urban and rural populations. Based on a large base of research, this work shows what was the role that the office holders allowed to play in the political process equipment planning at the Gobernación of Buenos Aires.
De la descentralización a la regionalización: Nuevo escenario de la guerra y oportunidad para la paz
Restrepo,Darío;
EURE (Santiago) , 2004, DOI: 10.4067/S0250-71612004008900005
Abstract: in many latin-american countries, the combination among neoliberal politics of adjustment, economic opening and transformations to political regimes, modify both economic geography and spatial conformation of institutions, political systems, social and corporative actors. colombia has also been affected by this redesign, that compromises the operation of its external and internal politics. the spatial effects of the economic opening combine with those of administrative, fiscal, and political process of decentralization, generating a tension on the geographical unit of the state. the consideration of these tendencies that have marked the paths of the economic, institutional, political, and social transformations since twenty years ago, indicate a probable way toward the regionalization of the country. will this regionalization be convenient for a more stable internal development and a favorable setting for a peace agreement based on a territorial distribution of the power, or will it be the promptest way to abandon each territory to its luck in the world competence, and to break the territorial unit of the colombian state? this is the question that is presented here
Rocas como símbolos: la selección de materias primas para puntas de proyectil en ambientes mesetarios de Patagonia
Hermo,Darío;
Intersecciones en antropolog?-a , 2008,
Abstract: analyses of hunter-gatherer lithic technologies from argentinean patagonia have been developed from ecological-economic perspectives, leaving aside the social and symbolic aspects that impacted technological organization. considering the analysis of projectile points of diverse ages from the patagonian plateaus, the visual aspect of these rocks, such as their color and brightness, is proposed as a non-exclusionary approach for the selection of the raw materials out of which they were manufactured. the proposed approach could open new interpretive paths for the region.
LOS DERECHOS HUMANOS: ENTRE LA BIOéTICA Y LA GENéTICA
Bergel,Salvador Darío;
Acta bioethica , 2002, DOI: 10.4067/S1726-569X2002000200011
Abstract: the evolution of human genetics, from the fifties onwards, acted as a trigger for multiple fields, especially for those dealing with bioethics and law. many of the advances accomplished may touch human dignity and, at the same time, they impel the creation of new human rights. on the basis of these premises the author analyses the most significant impacts of the new genetics upon society: the danger of a new eugenism, genetic discrimination, manipulation of genetic information, problems derived from the investigation on the genome, the appropriation of human genetic material; indicating, in conclusion some paths to follow
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