Search results for "lcsh:A"
showing 10 items of 1866 documents
Multi-technical approach for the characterization of polychrome decorative surfaces at Spanish Mission Churches in Nueva Vizcaya (Chihuahua, Mexico)
2020
An interdisciplinary and multi-institutional group of science and art conservation specialists has provided new insight into the painting materials used in the polychrome walls and wooden ceilings in four seventeenth century Spanish colonial churches of Nueva Vizcaya (Chihuahua, Mexico). A multi-analytical study of the decorative surfaces was performed in situ using spectroscopic approaches (XRF, FORS), False Colour Infrared Reflectography – IRFC, as well as micro sampling for ATR-FTIR, LM and GC/MS laboratory analyses. A survey of natural resources were also studied by ATR-FTIR and LM to elucidate the natural occurrence of a select number of materials found in the surrounding areas of the …
Analyzing Regional Geographic Challenges: The Resilience of Chinese Vineyards to Land Degradation Using a Societal and Biophysical Approach
2021
Land degradation, especially soil erosion, is a societal issue that affects vineyards worldwide, but there are no current investigations that inform specifically about soil erosion rates in Chinese vineyards. In this review, we analyze this problem and the need to avoid irreversible damage to soil and their use from a regional point of view. Information about soil erosion in vineyards has often failed to reach farmers, and we can affirm that to this time, soil erosion in Chinese vineyards has been more of a scientific hypothesis than an agronomic or environmental concern. Two hypotheses can be presented to justify this review: (i) there are no official and scientific investigations on viney…
Effect of ethanol on yeast film formation
1999
<p style="text-align: justify;">In this study, we have investigated the influence of ethanol on yeast film formation and cell surface hydrophobicity (CSH). A yeast strain (P3) previously isolated from film yeast was grown in a medium containing increasing ethanol concentration ranging from 0 to 14 p. cent (v/v). It results from this study that up to 10 p. cent ethanol, the greater was the ethanol concentration, the greater was the growth of film. Using two different techniques (phase partition method, magnobead assay), we have shown that ethanol altered the CSH of the yeast. The measured hydrophobicity (p. cent) of cells grown without ethanol was 65 p. cent compared with 81 p. cent wi…
Ischemic cardiovascular disease in workers occupationally exposed to urban air pollution – A systematic review
2018
Introduction Cardiovascular disease is the first cause of morbidity and mortality worldwide. Among several known risk factors, researchers also focus their attention on the chronic exposure to air pollution. There is much evidence that exposure to air pollution, especially to ultrafine particles, can damage the endothelium and can favour cardiovascular diseases in the general population. Occupational exposition could be an additive risk factor for the cardiovascular system. This article presents a scientific review of the linkage between occupational exposure to air pollution and ischemic heart disease. Material and methods A scientific review was undertaken, followed by PRISMA Statements. …
Nota de Presentación
2013
El primer número del Journal de Ciencias Sociales, revista académica de ciencias sociales de la Universidad de Palermo, presenta una colección de artículos escritos por autores que provienen de diferentes geografías y reflexionan sobre diversos temas: los tipos de investigaciones que se producen en ciencias sociales, las “buenas sociedades”, la diáspora de grupos étnicos y religiosos, las políticas de juventud, la recuperación histórica de la cultura, las vivencias de la espacialidad y la tenencia del suelo.
Evaluadores de este número
2013
Alicia Naveda Universidad Nacional de San Juan, Argentina Rocio Canudas Universidad Nacional Autonoma de Mexico e INDES-BID Diego Ceruso Universidad de Buenos Aires, Argentina Maria Eugenia Comerci Universidad Nacional de La Pampa-CONICET, Argentina Francisco Lavolpe Universidad Nacional de Lomas de Zamora, Argentina Patricia Lucero Universidad Nacional de Mar del Plata, Argentina Luciano Visentini Universidad degli studi di Firenze, Italia
Some new fixed point results in non-Archimedean fuzzy metric spaces
2013
In this paper, we introduce the notions of fuzzy $(\alpha,\beta,\varphi)$-contractive mapping, fuzzy $\alpha$-$\phi$-$\psi$-contractive mapping and fuzzy $\alpha$-$\beta$-contractive mapping and establish some results of fixed point for this class of mappings in the setting of non-Archimedean fuzzy metric spaces. The results presented in this paper generalize and extend some recent results in fuzzy metric spaces. Also, some examples are given to support the usability of our results.
Existence of viscosity solutions to two-phase problems for fully nonlinear equations with distributed sources
2018
In this paper we construct a viscosity solution of a two-phase free boundary problem for a class of fully nonlinear equation with distributed sources, via an adaptation of the Perron method. Our results extend those in [Caffarelli, 1988], [Wang, 2003] for the homogeneous case, and of [De Silva, Ferrari, Salsa, 2015] for divergence form operators with right hand side.
Nuevos’ y ‘viejos’ liderazgos: la campaña de las elecciones generales españolas de 2015 en Twitter
2016
El objetivo de esta investigación es analizar la actividad en Twitter, durante la campaña de las Elecciones Generales de 2015 en España, por parte de los líderes de los principales partidos políticos españoles: Mariano Rajoy (PP), Pedro Sánchez (PSOE), Pablo Iglesias (Podemos) y Albert Rivera (Ciudadanos). Más concretamente: cuántos mensajes, y de qué tipo, publicaron; en qué asuntos concentraron su atención; y de qué forma, o formas, preferenciales usaron Twitter: para difundir mensajes políticos, hacer referencia a las actividades del candidato en los medios o en la agenda de la campaña, o bien para enfatizar cuestiones personales. El planteamiento metodológico de la investigación está es…
Magnetic fields in heavy ion collisions: flow and charge transport
2020
At the earliest times after a heavy-ion collision, the magnetic field created by the spectator nucleons will generate an extremely strong, albeit rapidly decreasing in time, magnetic field. The impact of this magnetic field may have detectable consequences, and is believed to drive anomalous transport effects like the Chiral Magnetic Effect (CME). We detail an exploratory study on the effects of a dynamical magnetic field on the hydrodynamic medium created in the collisions of two ultrarelativistic heavy-ions, using the framework of numerical ideal MagnetoHydroDynamics (MHD) with the ECHO-QGP code. In this study, we consider a magnetic field captured in a conducting medium, where the conduc…