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Rheological Characterization of a Mixed Fruit/Vegetable Puree Feedstock for Hydrogen Production by Dark Fermentation  [PDF]
Jacob Gomez-Romero, Inés Garcia-Pe?a, Jorge Ramirez-Muoz, Luis G. Torres
Advances in Chemical Engineering and Science (ACES) , 2014, DOI: 10.4236/aces.2014.41011
Abstract:

Bio-hydrogen (Bio-H2) production from the organic fraction of solid waste, as fruit and vegetable wastes, constitutes an interesting and feasible technology to obtain clean energy. In spite of the feasibility to produce Bio-H2 from fruit/vegetable wastes (FVW), data about its rheological characterization are scarce. This information is useful to establish the hydrodynamic behavior, which controls the overall mixing process when the feedstock for Bio-H2 production process is a mixture of FVW. In this work, the rheological behavior of a vegetable/fruit waste mixture was characterized. The effect of the solids content (%, w/w), temperature, time (tyxotropy effects) and shear rate over the apparent viscosity of the mixture was evaluated. Most of the mixtures showed non-Newtonian behavior. The curves are typical rheofluidizing fluids. The rheological curves were different at increasing solids contents (80%, 60%, 40% and 30%), independent from the temperature. Rheological data were fitted to the power law model. Correlation factors R2 for the different mixtures were 0.991-0.995 for 80%, 0.961 -0.986 for 60%, 0.890

Caracterización de los ladrillos constitutivos de un puente histórico en Popayán (Colombia)
Galindo Díaz,Jorge Alberto; Muoz,Andrés Mauricio; Caicedo Muoz,Marisol;
Ingeniería e Investigación , 2008,
Abstract: this article presents the procedures and results of studying the physical-mechanical and chemical-mineralogical characterisation of the bricks originally used in a masonry arch bridge; the bridge was built in the first half of the 18th century in the city of popayán, colombia . coresamples were thus extracted from the bridge?s lower area and subjected to different laboratory tests. physical-mechanical characterisation quantified values related to dry weight, suspended weight, saturated weight, porosity, apparent gravity, apparent density and maximum load values, cold compression resistance and elasticity modulus. the results revealed the bricks? high porosity and their low resistance to compression stress. chemical-mineralogical characterisation involved a combination of tests including x-ray diffracttion (xrd), x-ray photoelectron spectroscopy (xps) and fourier transformed infrared spectroscopy (ftir). several minerals found led to deducting the source of the raw material, as well as verifying some brick production characteristics of the time in the said region. tridimite, cristobalite, magnetite and calcium carbonate were some of the phases formed by the temperatures reached while firing the bricks, while potassium sulphate presence in one of the samples conveyed the nature of the construction materials? production characteristics. combining xrd and xps analysis provided information about firing temperature and the new mineralogical phases appearing at the end of this process; ftir proved functional oh and si-o-si group presence. these bricks? characteristics provided valuable data for restoration purposes, formulating a new brick from raw material complying with reconstruction requirements.
Caracterización de los ladrillos constitutivos de un puente histórico en Popayán (Colombia) Characterising a historical bridge’s bricks in Popayán (Colombia)
Galindo Díaz Jorge Alberto,Muoz Andrés Mauricio,Caicedo Muoz Marisol
Ingeniería e Investigación , 2008,
Abstract: El objetivo de este artículo es presentar los procedimientos y resultados del estudio y caracterización físico-mecánica y químico-mineralógica de los ladrillos empleados originalmente en un puente de arco de alba ilería cuya cons-trucción data de la primera mitad del siglo XVIII, ubicado en la ciudad de Popayán, Colombia. Para ello se extraje-ron núcleos de las zonas bajas del puente a partir de los cuales se obtuvieron especímenes que fueron sometidos a diferentes pruebas de laboratorio. La caracterización físico-mecánica cuantificó valores relativos a peso seco, peso suspendido, peso saturado, porosidad, gravedad aparente, densidad aparente, y por último, valores de carga máxi-ma, resistencia a la compresión en frío y módulo de elasticidad. Los resultados obtenidos hacen ver la alta porosi-dad de los ladrillos y su baja capacidad resistente a esfuerzos de compresión. La caracterización químico-mineraló-gica se llevó a cabo mediante una combinación de pruebas que incluyeron difracción de rayos X (XRD), espectros-copia de fotoelectrones de rayos X (XPS) y espectroscopia infrarroja por transformada de Fourier (FTIR). Varios mine-rales encontrados permiten deducir la fuente del material crudo, así como verificar algunas características de la pro-ducción de ladrillo de la época en esta región. Tridimita, cristobalita, magnetita y carbonato de calcio son algunas de las fases formadas por las temperaturas alcanzadas en la cocción, mientras que la presencia de sulfato de pota-sio en una de las muestras da razón de características de producción de material para la construcción. La combina-ción de los análisis XRD y XPS suministra información sobre la temperatura de quemado y las nuevas fases minera-lógicas que aparecen al final de este proceso, mientras que FTIR permite comprobar la presencia de grupos funcio-nales OH y Si-O-Si, principalmente. Las características de estos ladrillos proporcionan datos valiosos para el propó-sito de restauración, formulando un nuevo ladrillo a partir del material crudo que se ajuste a los requerimientos de la construcción existente. This article presents the procedures and results of studying the physical-mechanical and chemical-mineralogical cha-racterisation of the bricks originally used in a masonry arch bridge; the bridge was built in the first half of the 18th century in the city of Popayán, Colombia. Core-samples were thus extracted from the bridge’s lower area and sub-jected to different laboratory tests. Physical-mechanical characterisation quantified values related to dry weight, sus-pended weight, saturated weight, por
ISELA-INIA, Nueva Variedad de Uva de Mesa
Hewstone O,Nicole; Valenzuela B,Jorge; Muoz S,Carlos;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000200011
Abstract: isela-inia is a mid season ripening table grape (vitis vinifera l.) cultivar released by the table grape breeding program at the la platina research centre of the national agricultural research institute, santiago, chile. the berries are medium-sized, seedless, green, firm and flavor-full. giberellic acid combined with girdling can be employed for thinning so as to increase berries size. it usually shows two clusters per shoot, so one cluster can be removed. some shoulders must be removed in order to improve fruit presentation; this thinning must be done before the veraison, to avoid bruising. it ripens before ?thompson seedless?. post harvest life in good conditions can last up to 45 days at 0oc.
Ilusión-INIA, una Nueva Variedad Temprana de Uva de Mesa
Valenzuela B,Jorge; Hewstone O,Nicole; Muoz S,Carlos;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000200012
Abstract: ilusión-inia is an early ripening table grape (vitis vinifera l.) cultivar released by the table grape breeding program at the la platina research centre of the national agricultural research institute, santiago, chile. berries are medium-sized, green, firm, with a muscatel flavor. fifty percent of the berries are seeded, but when treated with gibberellic acid for thinning only 10-20% of the berries are seeded. gibberellic acid sprays may be applied combined with girdling. so as to increase berries size, usually it shows two clusters per shoot, so one cluster can be removed. it ripens before ?perlette?. some shoulders must be removed to improve fruit presentation. post harvest life in good conditions can last up to 25-30 days at 0oc.
Estudio y caracterización de los ladrillos de un puente histórico en Buga (Valle del Cauca)
Galindo,Jorge; Paredes,Jairo; Muoz,Andrés;
Revista Facultad de Ingeniería Universidad de Antioquia , 2009,
Abstract: in colombia, bricklaying is constituted as a very significant construction technique present in historical buildings. however, with changes in their use, which generally implied increased dynamic loads, strong environmental variations, increased pollution, and the presence of different living organisms - among other factors - in recent years have apparently accelerated the deterioration of the materials conforming them (brick and lime mortar), in many occasions making it necessary to determine their physical and mechanical properties along with their chemical and mineralogical composition to diagnose the real state of the structure. this article explores the appropriate routines for such characterization to permit their future application in restoration processes of historical buildings. from the case study involving the masonry brick arch bridge constructed in the city of buga (valle del cauca) during the second half of the 19th century, we will establish how mechanical analysis of the bricks allows having reference patterns of its resistance behavior; simultaneously, mineralogical characterization permits identifying the composition and firing temperature of the bricks originally used in the construction.
Ilusión-INIA, una Nueva Variedad Temprana de Uva de Mesa Ilusión-INIA, a New Early Table Grape Cultivar
Jorge Valenzuela B,Nicole Hewstone O,Carlos Muoz S
Agricultura Técnica , 2007,
Abstract: Ilusión-INIA es una variedad muy temprana de uva de mesa (Vitis vinifera L.) liberada por el Programa de Mejoramiento Genético de Uva de Mesa del Centro Regional de Investigación La Platina del Instituto de Investigaciones Agropecuarias, Santiago. Las bayas son de tama o medio a grande, verdes, firmes, de un suave sabor moscatel. Un 50% de las bayas presentan semillas, este porcentaje disminuye a 10 a 20% con aplicaciones de ácido giberélico de raleo. La variedad responde al anillado y al ácido giberélico para aumentar el tama o de las bayas. Normalmente produce dos racimos por brote, por lo que uno de ellos puede ser removido. Madura antes que ‘Perlette’. Es necesario hacer arreglo de racimos entresacando hombros para mejorar la presentación de la fruta. En postcosecha puede permanecer hasta 25 a 30 días a 0oC en buenas condiciones. Ilusión-INIA is an early ripening table grape (Vitis vinifera L.) cultivar released by the Table Grape Breeding Program at the La Platina Research Centre of the National Agricultural Research Institute, Santiago, Chile. Berries are medium-sized, green, firm, with a muscatel flavor. Fifty percent of the berries are seeded, but when treated with gibberellic acid for thinning only 10-20% of the berries are seeded. Gibberellic acid sprays may be applied combined with girdling. so as to increase berries size, Usually it shows two clusters per shoot, so one cluster can be removed. It ripens before ‘Perlette’. Some shoulders must be removed to improve fruit presentation. Post harvest life in good conditions can last up to 25-30 days at 0oC.
ISELA-INIA, Nueva Variedad de Uva de Mesa Isela-INIA, a New Table Grape Cultivar
Nicole Hewstone O,Jorge Valenzuela B,Carlos Muoz S
Agricultura Técnica , 2007,
Abstract: Isela-INIA es una variedad de uva de mesa (Vitis vinifera L.) de maduración intermedia liberada por el Programa de Mejoramiento Genético de Uva de Mesa del Centro Regional de Investigación La Platina, del Instituto de Investigaciones Agropecuarias, Santiago, Chile. Las bayas son de tama o medio a grande, sin semilla, verdes, firmes, de un suave sabor moscatel. La variedad responde al ácido giberélico para raleo y para aumentar el tama o de las bayas en combinación con el anillado. Normalmente produce dos racimos por brote, por lo que uno de ellos puede ser removido. Madura antes que ‘Thompson Seedless’. Es necesario eliminar hombros al racimo para mejorar la calidad de postcosecha de la fruta. Este proceso debe ser realizado antes de la pinta para evitar manchado de la fruta. Puede permanecer hasta 45 días a 0oC en buenas condiciones de postcosecha Isela-INIA is a mid season ripening table grape (Vitis vinifera L.) cultivar released by the Table Grape Breeding Program at the La Platina Research Centre of the National Agricultural Research Institute, Santiago, Chile. The berries are medium-sized, seedless, green, firm and flavor-full. Giberellic acid combined with girdling can be employed for thinning so as to increase berries size. It usually shows two clusters per shoot, so one cluster can be removed. Some shoulders must be removed in order to improve fruit presentation; this thinning must be done before the veraison, to avoid bruising. It ripens before ‘Thompson Seedless’. Post harvest life in good conditions can last up to 45 days at 0oC.
Analysis of Two Clonal Lines (Embryogenic and Non-Embryogenic) of Agave fourcroydes Using AFLP and MSAP  [PDF]
Kelly M. Monja-Mio, Adriana Quiroz-Moreno, Gastón Herrera-Herrera, Jorge Luis Montero-Muoz, Felipe Sánchez-Teyer, Manuel L. Robert
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.94059
Abstract: Somatic embryogenesis is a very efficient way to propagate economically important plants; however, not all genotypes within a species can be propagated using this method, as a combined effect of both genetic and epigenetic mechanisms may be involved in the response. The aim of the present study was to perform a comparative analysis of the genetic differences through amplified fragment length polymorphism (AFLP) and the epigenetic differences through methylation-sensitive amplified polymorphism (MSAP) of two Agave fourcroydes clonal lines, one highly embryogenic (K33) and the other non-embryogenic (K7). Genetic and epigenetic variabilities existed within each clonal line; however, the polymorphic profiles from the two marker systems allowed us to clearly distinguish the two clonal lines before somatic embryogenesis induction. During the induction, the changes detected were mainly 1) unmethylated fragments in the initial explants that were methylated during induction (methylation events) and 2) fragments with different methylation states in the initial explant that were unmethylated in some stages of the process (demethylation events). K33 showed greater dynamism in relation to methylation/demethylation events, while K7 presented the methylation events in a
Estudio del procesamiento cerámico de las arcillas de la vereda "La Codicia" (Guapi, Colombia) para potencializar su uso en la elaboración de piezas cerámicas
Muoz Chaves,Javier Andrés; Muoz Menesea,Rodrigo Arbey; Mancill,Paulino; Rodríguez Páez,Jorge Enrique;
Revista Facultad de Ingeniería Universidad de Antioquia , 2007,
Abstract: in this work the characteristics of clay from the region of guapi, cauca, colombia were determined. also, a methodology was established to defi ne the conditions to conform ceramic pieces. chemical structure, characteristic composition and thermal behavior of raw material were determined using x-ray fl uorescence, (frx), x- ray diffraction (drx) and thermal gravimetric analysis (atd/tg), respectively. different stages of the ceramic processing were studied paying attention to dosage of the ceramic pastes, pressing of the pieces, drying and sintering. variables controlled were shaping pressure, lost of weight, time of drying, density in green and sintering temperature, among others. to achieve an appropriate drying it was necessary to maintain the samples in a controlled humidity atmosphere during about 7 days. independent of the composition of the pastes, sintering above 1000 °c was necessary to obtain high density samples considering that at 950 °c des-density of samples was observed probably due to "ostwald ripening" type phenomenon.
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