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Search Results: 1 - 10 of 2363 matches for " Rosario Pereiro "
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Nanomodificated Surface CoCr Alloy for Corrosion Protection of MoM Prosthesis  [PDF]
Cristina Díaz, Stephan M?ndl, Rosario Pereiro, Beatriz Fernández
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2015, DOI: 10.4236/jbnb.2015.62009
Abstract: Problems in metal-on-metal (MoM) hip replacement systems still persist due to high wear rates, low corrosion resistance and release of toxic ions and nanoparticles. As a consequence of these effects, failure, infections, loosening or bone resorption is the typical problems in the hip prosthesis. In order to reduce failure due to corrosion and/or releasing ions and particles, this study presents some works in a novel nanoscale surface modification of cobalt-chromium alloy (CoCr) for obtaining improved surface conditions in these alloys for these applications. Improving corrosion resistant of these alloys and achieving a low wear rate are possible to reduce the total released ions and particles released from the surface of this material. According to it, three different treatments using oxygen at temperatures of 300°C, 350°C and 400°C were carried out by plasma immersion ion implantation technique (PI3). X-ray diffraction (XRD) analysis shows an increase in the formation of chromium oxides in the outer surface of the CoCr alloy. It allows improving in corrosion resistant in CoCr alloys. Moreover, total quantity of released Co, Cr and Mo ions have been reduced. Wear rate studies showed a very similar behaviour after the treatments in relation to untreated CoCr alloy and release rate from the treated surface of CoCr alloys was reduced in comparison with untreated CoCr alloy.
Characterization of Doped Amorphous Silicon Thin Films through the Investigation of Dopant Elements by Glow Discharge Spectrometry: A Correlation of Conductivity and Bandgap Energy Measurements
Pascal Sánchez,Olaya Lorenzo,Armando Menéndez,Jose Luis Menéndez,David Gomez,Rosario Pereiro,Beatriz Fernández
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12042200
Abstract: The determination of optical parameters, such as absorption and extinction coefficients, refractive index and the bandgap energy, is crucial to understand the behavior and final efficiency of thin film solar cells based on hydrogenated amorphous silicon (a-Si:H). The influence of small variations of the gas flow rates used for the preparation of the p-a-SiC:H layer on the bandgap energy, as well as on the dopant elements concentration, thickness and conductivity of the p-layer, is investigated in this work using several complementary techniques. UV-NIR spectrophotometry and ellipsometry were used for the determination of bandgap energies of four p-a-SiC:H thin films, prepared by using different B 2H 6 and SiH 4 fluxes (B 2H 6 from 12 sccm to 20 sccm and SiH 4 from 6 sccm to 10 sccm). Moreover, radiofrequency glow discharge optical emission spectrometry technique was used for depth profiling characterization of p-a-SiC:H thin films and valuable information about dopant elements concentration and distribution throughout the coating was found. Finally, a direct relationship between the conductivity of p-a-SiC:H thin films and the dopant elements concentration, particularly boron and carbon, was observed for the four selected samples.
La sonrisa de la institución. Confianza y riesgo en sistemas expertos
Xerardo Pereiro
Política y Sociedad , 2008, DOI: -
Abstract: Sin resumen
Recasting Culture and Space in Iberian Contexts
Xerardo Pereiro
Análise Social , 2009,
Abstract:
Darwinismo y religión en el Reino Unido durante el periodo Mid-Victoriano
James Pereiro
Anuario de Historia de la Iglesia , 2009,
Abstract: El impacto del Origin of Species de Darwin estuvo reforzado en el ámbito religioso por la aparición, unos meses después, de los Essays and Reviews. La teoría evolucionista y la exégesis crítica alemana parecían minar los fundamentos de la fe. Sin embargo, las reacciones negativas con respecto al evolucionismo no fueron meramente religiosas; las objeciones de científicos de reconocido prestigio a la nueva teoría estaban avaladas en muchos casos por los resultados de la ciencia contemporanea. A medida que los nuevos descubrimientos cientícos removieron algunas de esas objeciones, la aceptación parcial del evolucionismo fue en aumento, también entre las diferentes denominaciones religiosas.
O mal que se adivinha: polícia e menoridade no Rio de Janeiro (1910-1920)
Jesica Pereiro
Avá : Revista de Antropología , 2010,
Abstract:
El turismo indígena Guna (Panamá): Imaginarios y regímenes de mentira de las guías turísticas internacionales
Pereiro Pérez,Xerardo;
Estudios y perspectivas en turismo , 2012,
Abstract: in this paper it is analyzed, from an anthropological perspective, the meaning and the ideological role of images and metanarratives indigenous tourist destination guna yala (panama), framing these in a scene of fighting between the gunas and the global tourism system. in this indigenous area is tested for decades a model self-managed community-based indigenous tourism that conflicts with tourism development models desired by the panamanian government and the global tourism system. after reviewing some theoretical debates about the role of tourism in the imaginary construction of the gaze, the author focus on the reflection on the tourist image of guna yala power relations arena, differentiated between the official tourist image, images gunas created by entrepreneurs and international tourist guides. the touristic images are defined as ideological artifacts that contribute to the creation of different versions of indigenous identities. the methodology used in the research has been the anthropological fieldwork (2003-2010), based on participant observation, document analysis work and content of the images and discourses on tourism guna. it has had special relevance the analysis of audiovisual and documental production of tourism images, especially that of international guides in order to research the tourist representation of the gunas of panama.
El Reverendo Padre Bonaventura Ubach, peregrino en Tierra Santa: el monje y su obra
Valdés Pereiro, Carmen
Arbor : Ciencia, Pensamiento y Cultura , 2005, DOI: 10.3989/arbor.2005.i711/712.478
Abstract: Se estudia aquí la figura de un religioso benedictino del Monasterio de Montserrat, el padre Bonaventura Ubach, que dedicó gran parte de su vida al estudio de la Biblia. Para conocer mejor el libro sagrado realizó numerosos viajes por Tierra Santa y Mesopotamia durante los primeros decenios del siglo XX. La documentación recogida durante sus viajes le permitiría realizar dos de sus más importantes obras: la ilustración de la Biblia de Montserrat y la creación del Museo Bíblico.…
El turismo indígena Guna (Panamá): Imaginarios y regímenes de mentira de las guías turísticas internacionales Indigenous Tourism Guna (Panama): Imaginaries and Lie Regimes of International Tourist Guides
Xerardo Pereiro Pérez
Estudios y perspectivas en turismo , 2012,
Abstract: En este texto se analizan, desde una perspectiva antropológica, el significado y el papel ideológico de las imágenes y metanarrativas turísticas del destino indígena Guna Yala (Panamá), encuadrando estas en un escenario de luchas entre los gunas y el sistema turístico global. En esa zona indígena se ensaya desde hace décadas un modelo autogestionado de turismo indígena de base comunitaria que choca con los modelos de desarrollo turístico deseados por el Estado paname o y el sistema turístico global. Luego de revisar algunos debates teóricos sobre el papel de los imaginarios turísticos en la construcción de los sentidos del lugar, se reflexiona sobre las imágenes turísticas de Guna Yala como arena de relaciones de poder, diferenciado entre las imágenes turísticas oficiales, las imágenes creadas por los empresarios gunas y las de las guías turísticas internacionales. Las imágenes turísticas se entienden como artefactos ideológicos que contribuyen para la creación de diferentes versiones de las identificaciones indígenas. La metodología empleada en esta investigación ha sido el trabajo de campo antropológico (2003-2010), con base en la observación participante, y el trabajo de análisis documental y de contenido de las imágenes y discursos sobre el turismo guna. Se ha dado una especial relevancia al análisis de la producción de cultura audiovisual y documental turística, especialmente la de las guías internacionales, con el objeto de indagar sobre la representación turística de los gunas de Panamá. In this paper it is analyzed, from an anthropological perspective, the meaning and the ideological role of images and metanarratives indigenous tourist destination Guna Yala (Panama), framing these in a scene of fighting between the gunas and the global tourism system. In this indigenous area is tested for decades a model self-managed community-based indigenous tourism that conflicts with tourism development models desired by the Panamanian government and the global tourism system. After reviewing some theoretical debates about the role of tourism in the imaginary construction of the gaze, the author focus on the reflection on the tourist image of Guna Yala power relations arena, differentiated between the official tourist image, images gunas created by entrepreneurs and international tourist guides. The touristic images are defined as ideological artifacts that contribute to the creation of different versions of indigenous identities. The methodology used in the research has been the anthropological fieldwork (2003-2010), based on participant observation, docume
Structure and static response of small silver clusters to an external electric field
M. Pereiro,D. Baldomir
Physics , 2007, DOI: 10.1103/PhysRevA.75.033202
Abstract: The static response properties and the structural stability of silver clusters in the size range $1\le n \le 23$ have been studied using a linear combination of atomic Gaussian-type orbitals within the density functional theory in the finite field approach. The Kohn-Sham equations have been solved in conjuction with a generalized gradient approximation (GGA) exchange-correlation functional. A proof that the finite basis set GGA calculation holds the Hellmann-Feynman theorem is also included in the Appendix. The calculated polarizabilities of silver clusters are compared with the experimental measurements and the jellium model in the spillout approximation. Despite the fact that the calculated polarizabilities are in good agreement with both of them, we have found that the polarizability appears to be strongly correlated to the cluster shape and the highest occupied-lowest unoccupied molecular-orbital gap.
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