Search results for "69"
showing 10 items of 1106 documents
X-ray CT analyses, models and numerical simulations: a comparison with petrophysical analyses in an experimental CO2 study
2016
An essential part of the collaborative research project H2STORE (hydrogen to store), which is funded by the German government, was a comparison of various analytical methods for characterizing reservoir sandstones from different stratigraphic units. In this context Permian, Triassic and Tertiary reservoir sandstones were analysed. Rock core materials, provided by RWE Gasspeicher GmbH (Dortmund, Germany), GDF Suez E&P Deutschland GmbH (Lingen, Germany), E.ON Gas Storage GmbH (Essen, Germany) and RAG Rohöl-Aufsuchungs Aktiengesellschaft (Vienna, Austria), were processed by different laboratory techniques; thin sections were prepared, rock fragments were crushed and cubes of 1 cm edge leng…
Micro- and nano-porosity of the active Alpine Fault zone, New Zealand
2020
Porosity reduction in rocks from a fault core can cause elevated pore fluid pressures and consequently influence the recurrence time of earthquakes. We investigated the porosity distribution in the New Zealand's Alpine Fault core in samples recovered during the first phase of the Deep Fault Drilling Project (DFDP-1B) by using two-dimensional nanoscale and three-dimensional microscale imaging. Synchrotron X-ray microtomography-derived analyses of open pore spaces show total microscale porosities in the range of 0.1 %–0.24 %. These pores have mainly non-spherical, elongated, flat shapes and show subtle bipolar orientation. Scanning and transmission electron microscopy reveal the…
Control of 3-D tectonic inheritance on fold-and-thrust belts: insights from 3-D numerical models and application to the Helvetic nappe system
2020
We apply three-dimensional (3-D) thermo-mechanical numerical simulations of the shortening of the upper crustal region of a passive margin in order to investigate the control of 3-D laterally variable inherited structures on fold-and-thrust belt evolution and associated nappe formation. We consider tectonic inheritance by employing an initial model configuration with basement horst and graben structures having laterally variable geometry and with sedimentary layers having different mechanical strength. We use a visco-plastic rheology with a temperature-dependent flow law and a Drucker–Prager yield criterion. The models show the folding, detachment (shearing off) and horizontal transport of …
Editorial NoteA case of plagiarism: "Modelling of the wave fields by the modification of the matrix method in anisotropic media" published in Solid E…
2018
No abstract available.
Squirt flow due to interfacial water films in hydrate bearing sediments
2018
Sediments containing gas hydrate dispersed in the pore space are known to show a characteristic seismic anomaly which is a high attenuation along with increasing seismic velocities. Currently, this observation cannot be fully explained albeit squirt-flow type mechanisms on the microscale have been speculated to be the cause. Recent major findings from in situ experiments, using the gas in excess and water in excess formation method, and coupled with high-resolution synchrotron-based X-ray micro-tomography, have revealed the systematic presence of thin water films between the quartz grains and the encrusting hydrate. The data obtained from these experiments underwent an image processing proc…
Post-entrapment modification of residual inclusion pressure and its implications for Raman elastic thermobarometry
2020
Residual pressure can be preserved in mineral inclusions, e.g. quartz-in-garnet, after exhumation due to differential expansion between inclusion and host crystals. Raman spectroscopy has been applied to infer the residual pressure and provides information on the entrapment temperature and pressure conditions. However, the amount of residual pressure relaxation cannot be directly measured. An underestimation or overestimation of residual pressure may lead to significant errors between calculated and actual entrapment pressure. This study focuses on three mechanisms responsible for the residual pressure modification: (1) viscous creep; (2) plastic yield; (3) proximity of inclusion to the thi…
A methodological framework based on a DANP model for evaluating the software quality in terms of usability: a preliminary investigation on mobile ope…
2020
Evaluation of the software usability as concerns software alternatives represents a typical Multi- Criteria Decision-Analysis (MCDA) problem. Such a kind of problem can be successfully faced via structured models and approaches which validity have been widely shown in literature. In this work, a methodological framework based on a MCDA model integrating the DEMATEL method along with the ANP technique is proposed and explained with more detail to address the relevant issue of the software usability evaluation. The applicability of the considered DEMATEL-ANP (DANP) based model in the under analysis contest is demonstrated via a preliminary investigation, where the usability of the two major M…
Flujos de transporte y relaciones interurbanas en la provincia de Valencia.
1987
Julia Salom Carrasco: Julia.Salom@uv.es Este artículo recoge parte de los resultados dcl proyecto dc investigación <‘Jerarquía urbana y áreas de atracción en la provincia de Valencia’, subvencionado por el Instituto de Geografía de la Institución Alfonso cl Magnánimo dc la Diputación Provincial de Valencia. Agradecemos la colaboración de A. Andrés Gomis, J. R. cuevas Camps y M. Montero Fernández, que recopilaron y tabularon la información, y realizaron gran parle de la cartografía.
La formación docente en línea: experiencias con MOOCs en Sonora (México)
2019
espanolEl proposito de este estudio fue conocer las perspectivas que un grupo de profesores del estado de Sonora (Mexico) tienen sobre la formacion en linea y sobre los cursos en linea masivos y abiertos (MOOCs, por sus siglas en ingles) “Coleccion de Aprendizajes Clave”. Estos MOOCs fueron disenados para dar a conocer a los profesores de educacion basica los planteamientos del nuevo modelo educativo derivado de la reforma de 2013. El enfoque aplicado en la investigacion fue el cualitativo; los datos se colectaron por medio de entrevistas semiestructuradas a seis profesoras de primaria. Las perspectivas de las profesoras en cuanto a la formacion en linea se concentraron en las categorias de…
Los procesos de revisión textual en entornos virtuales de aprendizaje. Evaluar para aprender en la universidad
2020
Este trabajo presenta los resultados de una investigacion vinculada al desarrollo de competencias en evaluacion de la expresion escrita —revision y reescritura— en colaboracion y en linea. En ella han participado 167 estudiantes matriculados durante 2018-2019 en primer y cuarto curso de los titulos de grado de Maestro/a en Educacion Primaria (EP) y en Educacion Infantil (EI) de la Universitat de Valencia. Los datos analizados provienen de la experimentacion de una serie de practicas pedagogicas encaminadas al desarrollo y mejora de las competencias comunicativas academico-profesionales de ambas titulaciones y a todas luces convergentes con los principios del marco metodologico del EEES: (1)…