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1
artículo
Publicado 2010
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The structural evolution and dynamics of silver nanodrops Ag_2869 (4.4 nm in diameter) under rapid cooling conditions have been studied by means of molecular dynamics simulations and electronic density of state calculations. The interaction of silver atoms is modelled by a tight-binding semiempirical interatomic potential proposed by Cleri and Rosato. The pair correlation functions and the pair analysis technique are used to reveal the structural transition in the process of solidification. It is shown that Ag nanoparticles evolve into different nanostructures under different cooling processes. At a cooling rate of 1.5625 × 10(13) K s−1 the nanoparticles preserve an amorphous-like structure containing a large amount of 1551 and 1541 pairs which correspond to icosahedral symmetry. For a lower cooling rate (1.5625 × 1012 K s−1 ), the nanoparticles transform into a crystal-like struc...
2
artículo
Publicado 2002
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Using Monte Cario simulation have been carried out an.atomistic description of the structure and ordering processes in the system Cu - Au in a two-dimensional model. The ABV model of the alloy is a system of N atoms A and B, located in rigid lattice with sorne vacañt sites. In the model we assume pair wise interactions between nearest neighbors with constant ordering energy J,;, 0.03 eV. The dynarnics was introduced by means of a vacancy that exchanges of place with any atom of its neighbors . The simulations were carried out in a square lattice with 1024 and 4096 particles, using periodic boundary conditions to avoid border effects. We calculate the first two parameters of short range arder of Warren-Cowley as function of the concentration and tenl.petature. It was also studied the probabilities of formation of different atomic clusters that consist of 9 atoms as function of the concen...
3
artículo
Publicado 2022
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Creative tourism is currently emerging as a differential and alternative proposal for experiences to vindicate the cultural, environmental and artistic aspects, while the tourist simulates immersive interaction with social, cultural and natural landscapes. This article develops a case study with the village community of La Puerta, San Nicolás de quebrada seca, municipality of Sopetrán, Antioquia, in order to analyze the possibilities of tourism use, which can be accessed by the inhabitants of the Afro-descendant collective territory of the village of La Puerta, in Sopetrán, Antioquia, from the approach of the orange economy. For this purpose, a qualitative research method was applied, from a participatory and interactive methodological approach, with the predominance of techniques such as sociographic analysis and group discussion. Recognition of the modes of representation and territ...
4
tesis de grado
Publicado 2024
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Actualmente en el Perú se tienen varios proyectos mineros, los cuales priorizan la construcción de campamentos mineros modulares, para el adecuado descanso se sus colaboradores; los cuales tengan los servicios básicos y brinden las comodidades que pudieran encontrar en sus respectivos hogares. Para que se puedan ejecutar los campamentos mineros se requiere de una serie de procesos propios de la construcción, pero a la par se requiere asegurar y controlar que la construcción de los campamentos mineros se realice de acuerdo a lo requerido por el cliente, lo cual esta previamente establecido en las especificaciones del proyecto. Para el aseguramiento y control de la calidad de la construcción de los campamentos mineros modulares se requiere una serie de formatos y registros como son los planes de calidad, planes de inspección y ensayo (PIE), registros de control de obra; estos planes...
5
tesis doctoral
Publicado 2019
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Descargue el texto completo en el repositorio institucional de la Communauté Université Grenoble Alpes: https://tel.archives-ouvertes.fr/tel-02506388
6
artículo
The aim of the present study is to analyze the role of the gut microbiotain the progression of Parkinson's disease by performing a literature review. Parkinson's disease is a neurodegenerative disease caused by the degeneration of dopaminergic neurons in the substantia nigra (pars compacta). The frequency of the disease varies with age and gender, being more common in men over 60 years of age. The main cause of neuronal death is unknown and may be related to degenerative processes such as mitochondrial dysfunction, a-synuclein aggregation, altered autophagy, endoplasmic reticulum (ER) stress or dysregulation of intracellular calcium homeostasis. The gut microbiota is an integral part of the human organism and contributes to many physiological processes, including immune defense. The interaction between the gut microbiota and the central nervous system (CNS) is known as the microbiota-gut...
