Search results for "BD"
showing 10 items of 3363 documents
Active north-vergent thrusting in the northern Sicily continental margin in the frame of the quaternary evolution of the Sicilian collisional system
2021
Abstract A three-stage evolution has characterized the Sicilian Fold and Thrust Belt (SFTB) during the last 15 My: two main thin-skinned shortening events involving mainly Meso-Cenozoic carbonate units, followed by thick-skinned thrusting involving Plio-Pleistocene deposits in the frontal area as well as the crystalline basement in the inner and deeper sector of the chain. We investigated the northern Sicily continental margin, by using differently-penetrative seismic reflection data and new field surveys, which revealed, both offshore and onshore, north-vergent compressional structures that affected the tectonic edifice during Quaternary time. These structures, correlated with the kinemati…
Helium isotopes and tectonics in southern Italy
1989
Geodynamic evolution of southern Italy can be understood within the framework of the Mediterranean-Alpine System. Subduction of a plate along the Sicily-Calabrian forearc under the Tyrrhenian Sea has been suggested by many geophysicists, although it is not yet confirmed and remains somewhat controversial. Helium isotope ratios provide useful information on the geotectonic structure of the region. The authors report here the {sup 3}H/{sup 4}He ratios of terrestrial gas samples from southern Italy. The observed {sup 3}He/{sup 4}He ratios are relatively high in the Eolian volcanic arc region and low in the other areas. Dichotomous explanations are presented. Firstly, volcanic arc-forearc hypot…
Recycling and transport of continental material through the mantle wedge above subduction zones: A Caribbean example
2016
Abstract Estimates of global growth rates of continental crust critically depend upon knowledge of the rate at which crustal material is delivered back into the mantle at subduction zones and is then returned to the crust as a component of mantle-derived magma. Quantification of crustal recycling by subduction-related magmatism relies on indirect chemical and isotopic tracers and is hindered by the large range of potential melt sources (e.g., subducted oceanic crust and overlying chemical and clastic sediment, sub-arc lithospheric mantle, arc crust), whose composition may not be accurately known. There is also uncertainty about how crustal material is transferred from subducted lithosphere …
The southern margin of the Caribbean Plate in Venezuela: tectono-magmatic setting of the ophiolitic units and kinematic evolution
2002
Abstract The southern Caribbean Plate margin in Venezuela consists of a W–E elongated deformed belt, composed of several tectonic units dismembered along the northern part of the South America continental Plate since the Late Cretaceous. The present review, based on petrology and tectono-magmatic significance of each unit, makes it possible to define the main geotectonic elements and to reconstruct the paleogeographic domains from Late Jurassic to Tertiary: (a) Mid-Ocean Ridge Basalt (MORB) proto-Caribbean oceanic basin (Loma de Hierro Unit); (b) oceanic plateau (Dutch and Venezuelan Islands basement); (c) rifted continental margin (Cordillera de La Costa and Caucagua–El Tinaco Units) with …
Intrabiliary rupture of hepatic hydatid cyst: MRI findings
2016
Learning objectives Background Findings and procedure details Conclusion Personal information References
Rhabdomyolysis associated with the co-administration of daptomycin and pegylated interferon α-2b and ribavirin in a patient with hepatitis C
2012
Evaluación del tratamiento quirúrgico de la hernia de hiato. Valoración de indicaciones, efectividad y resultados.
2015
Estado actual del problema y justificación del estudio En la primera mitad del siglo XX la cirugía de la hernia hiatal se limitaba a casos agudos (vólvulo asociado, isquemia del estómago incarcerado. Las características típicas de estos pacientes; en su mayoría enfermos mayores con importantes comorbilidades y la cirugía de urgencia suponía en algunas series una mortalidad de hasta el 40%. Muchos cirujanos, influenciados por los estudios de Belsey y Hill abogaron por la reparación de las hernias en el momento del diagnóstico, fueran o no sintomáticas para evitar las posibles complicaciones. El abordaje laparoscópico, con la minimización de las complicaciones perioperatorias, apoyó la repara…
Valoración biomecánica de la columna vertebral basada en el análisis funcional de diversas actividades de la vida diaria
2018
En la literatura se han utilizado pruebas dinámicas sobre movimientos sencillos, como la flexo-extensión del tronco o la marcha, para distinguir de manera objetiva entre sujetos sanos y pacientes con dolor lumbar de causa inespecífica. No tenemos constancia de estudio alguno que haya registrado de manera simultánea los patrones de actividad neuromuscular de la musculatura extensora de la espalda, musculatura abdominal, glúteos e isquiotibiales y los patrones de movimiento lumbo-pélvico, estudiando el efecto de la velocidad y carga, mediante técnicas no invasivas durante actividades de la vida diaria, y los haya comparado entre distintos grupos de pacientes con dolor lumbar y alteraciones es…
CCDC 232005: Experimental Crystal Structure Determination
2004
Related Article: E.Coronado, J.R.Galan-Mascaros, C.Gimenez-Saiz, C.J.Gomez-Garcia, E.Martinez-Ferrero, M.Almeida, E.B.Lopes, S.C.Capelli, R.M.Llusar|2004|J.Mater.Chem.|14|1867|doi:10.1039/b402630f
A Computational Study of Adsorption of CO2, SO2, and H2CO on Free-Standing and Molybdenum-Supported CaO Films
2018
Oxide films play a significant role in a wide range of fields from catalysis to solar cell materials. CaO films are promising sorbents for many environmentally harmful molecules. Here, we report a systematic investigation of adsorption of CO2, SO2, and H2CO on bulk and Mo-supported CaO(100) films using density functional theory. Significant effects on adsorption energy, charge transfer to the molecules, and degree of the C–O bond activation were demonstrated on Mo-supported CaO films by changing the film thickness, composition, and the strength and direction of an applied external electric field. These findings are relevant for interpreting results from scanning tunneling microscopy of smal…