6.1 Proyectos de investigación científica
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PublicaciónUso del programa Energyplus para la simulación del consumo energético de un módulo bioclimático ubicado en Imata, Arequipa a 4519 msnm(Universidad Nacional de Ingeniería, 2018)El presente trabajo forma parte de la línea de investigación en el campo del estudio Bioclimático en edificaciones que se viene desarrollando en la Facultad de Ciencias de la UNI la cual queda demostrado con las tesis sustentadas precedentes a la misma. 1Huaylla Fredy. Evaluación Experimental de Cambios Constructivos para Lograr Confort Térmico en una Vivienda Altoandina del Perú. Estudio de rehabilitación térmica de una vivienda existente para lograr incrementos de temperatura de al menos 6°C respecto a los mínimos registrados. 2 Saavedra Gonzalo. Construcción y Evaluación Térmica de un Módulo de Vivienda Rural en la Localidad de Vilcallamas Arriba, Distrito de Pisacoma, Provincia de Chucuito, Región Puno. Evaluación térmica de una vivienda nueva con resultados interiores de temperaturas entre 10.2 y 14.6°C, sensiblemente agradables, pero con temperaturas inferiores a la de confort. Espinoza Rafael. Evaluación experimental de la performance de dos componentes bioclimáticas de calentamiento aplicadas en un módulo de vivienda de San Francisco de Raymina - Ayacucho con el propósito de validarlas como técnicas de estrategias bioclimáticas para viviendas rurales Alto Andinas. Se concluye que es posible afirmar el mejor comportamiento del sistema de tubo radiante sobre el de muro radiante. 4Molina Jessica. Desarrollo de un Procedimiento de Evaluación Integral de una Vivienda Rural Alto Andina para su Calificación como Vivienda Bioclimática Caso de la Vivienda Modificada y la Vivienda Nueva de San Francisco de Raymina de Ayacucho. Se destaca la importancia de analizar la dinámica de utilización de la vivienda y la manera que los pobladores interactúan con las técnicas utilizadas con la finalidad de lograr el confort térmico deseado. 5Molina Juan. Evaluación Sistemática del Desempeño Térmico de un Módulo Experimental de Vivienda Alto Andina para Lograr el Confort Térmico con Energía Solar. Se logran ganancias internas del orden de los 9.45°C en promedio y, de hasta 16.62°C en horas críticas de la madrugada respecto a la temperatura exterior de -7.09°C a las 6:00am. Parte de este trabajo ha sido reportado en la siguiente publicación: Diseño de un módulo experimental bioclimático ubicado en Imata, Arequipa (4519 msnm) Juan Omar Molina Fuertes, Guilles Lefebvre, Manfred Horn, Mónica Marcela Gómez León Sometida a la Revista DYNA de la Universidad Nacional de Colombia
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PublicaciónBoron avoids cycloalkane-like structures in the LinBnH2n series(Royal Society of Chemistry, 2016)The stability of the LinBnH2n (n = 3–6) series was analyzed using quantum chemical calculations, and it was found that cyclic isomers are not energetically favored. This is different to what happens in their organic counterparts (CnH2n), where cyclopentane (C5H10) and cyclohexane (C6H12) are the low-lying isomers. Apparently, aromaticity is a key-stabilizing factor that needs to be considered for designing stable lithium-boron hydride analogues of cyclic organic compounds. This is verified in the Li3B3H3+ system, which has been designed as the smallest aromatic carbocation (C3H3+) analogue. The global minimum structure of Li3B3H3+ contains a triangular B3H32− moiety, which has structural and chemical bonding features similar to its organic counterpart. Besides, this new cluster is classified as aromatic according to both the 4n + 2 Hückel rule and the analysis of the induced magnetic field. This theoretical evidence leads us to propose this cluster as a viable target for experimental detection in the gas phase.
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PublicaciónMoisture-sensitive properties of multi-walled carbon nanotubes/polyvinyl alcohol nanofibers prepared by electrospinning electrostatically modified method(Elsevier, 2016)Polyvinyl alcohol (PVA) nanofibers reinforced with multi-walled carbon nanotubes (MWCNTs) were fabricated by electrospinning. MWCNTs were introduced into the PVA matrix through the application of an electric field. The morphology of the composite MWCNTs/PVA fibers was characterized by scanning electron microscopy. Results show that the nanofibers had a diameter between 48 and 103 nm and contained a variable amount of MWCNTs. The electrical properties of MWCNTs/PVA nanofibers were investigated by fabricating impedance-type sensors. The impedance and electrical conductivity of the samples were evaluated in the range 46% and 89% relative humidity.
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PublicaciónAntimicrobial peptides purified from hydrolysates of kanihua (Chenopodium pallidicaule Aellen) seed protein fractions(Elsevier Ltd, 2021)The kanihua (Chenopodium pallidicaule Aellen) Andean grain from the Peruvian Altiplano presents proteins of 15% to 19%. The objective was to obtain purified bioactive antimicrobial peptides (AMPs), hydrolyzed with Alcalase and Pepsin-pancreatin sequential system of protein fractions of kanihua varieties Ramis (KR) and CupiSayhua (KS), and hydrolysates with different degrees of hydrolysis (DH) and percentage inhibition (IP) of the growth of E. coli, S. aureus, and C. albicans. To obtain AMPs, nutraceuticals, bio-preservatives, and novel ingredients in food design. The results showed 216 hydrolysates (1%, w/v), only 28 presented significant difference compared to controls (IP 0.05), and presented an anionic charge. In conclusion, the simulated digestion in vitro showed higher DH (7%-67%) than Alcalase (13%-54%); the majority were extensive; of 28 hydrolysates with IP 45% 4 AMPs with important IPs were obtained, and one was anionic.
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PublicaciónLeaching of a pyrite-based ore containing copper using sulfuric acid and hydrogen peroxide(Springer, 2020)The oxidation of sulfide-based ores is industrially relevant as it facilitates the extraction of valuable metals and eliminates undesired elements from an ore. Even though oxidation can be done thermally (pyrometallurgy), solution-based (hydrometallurgical) methods are currently sought as they represent a more sustainable option. Here, the leaching of a sulfide ore (32% Fe, 2% Cu) is investigated using a mixture of sulfuric acid and hydrogen peroxide (0.15 M H2SO4 and 0.5 M H2O2), in proportions forming a slurry 10% w/w. The leaching process is found to occur in two stages, the first corresponding to an exothermic, peroxide-mediated dissolution, and the second corresponding to an acid-mediated reaction, which appears to be thermoneutral. Control experiments performed with only peroxide confirm that this oxidant is involved in the first stage of the dissolution process. The leaching process leads to copper and iron dissolution (15% and 5%, respectively), as determined using atomic absorption spectrometry (AAS). The mass of pyrite dissolved is estimated from AAS measurements and, from the stoichiometry of the peroxide-mediated dissolution reaction, it is found that ~ 80% of the peroxide participates in the dissolution, with the other 20% being decomposed, in a reaction catalyzed by ferric (Fe+3) ions produced during the first stage of the dissolution. © 2020, Islamic Azad University.
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