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Search Results: 1 - 10 of 274653 matches for " Cabrales R. Roberto Antonio "
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Evaluation of seed yield and oil contents in four materials of Ricinus communis L.
Plaza T. Guido Armando,Cabrales R. Roberto Antonio,Marrugo N. José Luis
Agronomía Colombiana , 2011,
Abstract: Four castor materials were evaluated in 2009 in the middle region of Valle del Sinu, Colombia. The variables were phonological development, plant height, seed production and oil yield, in order to determine the best material for commercial purposes. All materials reported high yields of oil seeds and highlighting the commercial genotype Nordestina BRS149, 2.2 t ha-1 seed and 47% oil content. Planting distances were 1.5 x 1.5 m and 2.0 x 2.0 m, with densities of 6,666 and 3,906 plants ha-1, respectively. The plant height, seed productivity and oil yield showed significant differences for the interaction density × material; while comparing each material density, seed production only showed differences. These variables were significantly different between population densities, which shows that the higher the plant height, lower productivity. The planting distance of 2.0 x 2.0 m, provides higher productivity per plant values but seed oil yields were not different between densities. The oil quality parameters were assessed using free fatty acid value, iodine, acidity index, saponification, refraction and specific gravity, found that planting distance does not affect the quality of oil.
Stochastically stable implementation
Antonio Cabrales,Roberto Serrano
SERIEs , 2012, DOI: 10.1007/s13209-011-0062-7
Abstract: Restricting attention to economic environments, we study implementation under perturbed better-response dynamics (BRD). A social choice function (SCF) is implementable in stochastically stable strategies of perturbed BRD whenever the only outcome supported by the stochastically stable strategies of the perturbed process is the outcome prescribed by the SCF. For uniform mistakes, we show that any ε-secure and strongly efficient SCF is implementable when there are at least five agents. Extensions to incomplete information environments are also obtained.
The causes and economic consequences of envy
Antonio Cabrales
SERIEs , 2010, DOI: 10.1007/s13209-010-0028-1
Abstract: In this lecture I first give an explanation for invidious preferences based on the (evolutionary) competition for resources. Then I show that these preferences have wide ranging and empirically relevant effects on labor markets, such as: workplace skill segregation, gradual promotions, wage increases that have no relation with productivity and downward wage flexibility. I suggest that labor and human resource economics can benefit from including envy into the standard set of factors considered in their theoretical and empirical models.
Intervención valvular aórtica percutánea: una terapia novedosa, pero viable en nuestro medio? Percutaneous aortic valve replacement: a novel therapy, but feasible in our environment?
Jaime R Cabrales
Revista Colombiana de Cardiología , 2012,
Optical Spectra and Stokes Shift in Nanometric Quantum Wells  [PDF]
Antonio A. P. Silva, Eliermes A. Meneses, Aurea R. Vasconcellos, Roberto Luzzi
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.36A001

We consider semiconductor heterostructures in nanometric quantum wells, which as a consequence of the growth process display at the rugged interfaces fractal characteristics, and largely influence optical and transport properties of the carriers system. The photoluminescence and excited photoluminescence spectra in such fractal conditions are theoretically analyzed, obtaining good agreement with the experimental results. The Stokes shift and linewidth are strongly dependent on the nonequilibrium thermomechanical-statistical state of the system. The Stokes shift has its origin in the presence of a gain region in the absorption spectrum, only present when the carriers system is in a statistical degenerate state.

Cabrales,Roberto; Montoya,Rafael; Rivera,Jaime;
Revista MVZ Córdoba , 2007,
Abstract: objective. to evaluate seven millo and five sorghum genotypes to determine forage yield and to use it in feeding bovine in sinú valley, colombia. materials and methods. sorghum (sorghum vulgare) and millo seeds were hybrid materials and commercial type varieties. a design of complete blocks at random was used with four repetitions for millo and three for sorghum. results. regarding vigor the genotypes that better behavior presented were the round cuba and white long panicle for millo and lc 603, p-8239 and dr-1125 for sorghum. the millos that showed bigger senescence was the high cuarentano, the cane and the white long panicle; in sorghum those of more senescence were p-8239, lc 603 and 74 co. biggest production of green forage and dry matter were presented by millo, batea cuba, round cuba and white long panicle genotypes, for sorghum were blanco creole and dr-1125. the biggest yield grain was of batea cuba and cane genotypes in millo, and in sorghum were dr-1125 and lc 603. as materials of good behavior inside all those evaluated were selected the batea cuba, round cuba, and white long panicle in millo and blanco creole and dr-1125 in sorghum. conclusions. the millo genotypes that better behavior presented were in its order for yield (ton/ha): batea cuba, round cuba and white long panicle (ton/ha), being obtained a bigger capacity of animal load. the genotypes of better behavior of sorghum were blanco creole and dr-1125.
Cabrales,Roberto; Montoya,Rafael; Rivera,Jaime;
Revista MVZ Córdoba , 2007,
Abstract: objective.to evaluate agronomically 25 genotypes of maize for forage purposes. materials and methods. this research was carried out in turipaná investigation center belonging to corpoica at córdoba department. a lattice design 5x5 was used, with 36 treatments and three repetitions by treatment. results. higher yields were showed by the following maize genotypes: hit 34 with 63.52 ton/ha of fresh matter, 22.11 ton/ha of dry matter and 3.10 ton/ha of grain; vera 225 with 61.13 ton/ha of fresh matter, 20.11 ton/ha of dry matter and 4.37 ton/ha of grain; snlp 111 with 60.62 ton/ha of fresh matter, 19.20 ton/ha of dry matter and 4.69 ton/ha of grain; ica v 156 with 54.51 ton/ha of fresh matter, 17.1 ton/ha of dry matter and 4.41 ton/ha of grain; for prolificacy showed like better genotypes the vera 225 with 1 ear per plant, being the second genotype in production of fresh matter and one of the higher in grain production; in grain index snlp 111 was the greatest with 82.87%, outstanding as the genotype of higher production of grain, the relation of dry matter of leaf-stem-ear were better represented by the genotypes cuba 91 with 33.63%: 20.43%: 45.97% and ica v 156 with 32.33%: 24.43%: 43.23%, respectively. conclusions. there are good genotypes of maize to be use by farmers in silage processes.
Roberto Cabrales,Rafael Montoya,Jaime Rivera I.
Revista MVZ Córdoba , 2007,
Abstract: Objetivo. Evaluar agronómicamente 25 genotipos de maíz con fines forrajeros. Materiales y métodos. La investigación se realizó en predios del centro de Investigación Turipaná de Corpoica, departamento de Córdoba. Se empleó un dise o de campo en latice 5x5, con 25 tratamientos y tres repeticiones por tratamiento. Resultados. Los genotipos de maíz, que mostraron los mayores rendimientos de materia fresca, seca y de grano fueron: HIT 34 con 63.52 Ton/ha de materia fresca,22.11 Ton/ha de materia seca y 3.10 Ton/ha de grano; VERA 225 con 61.13 Ton/ha de materia fresca, 20.11 Ton/ha de materia seca y 4.37 Ton/ha de grano; SNLP 111 con 60.62 Ton/ha de materia fresca, 19.20 Ton/ha de materia seca y 4.69 Ton/ha de grano; ICA V 156 con 54.51 Ton/ha de materia fresca, 17.1 Ton/ha de materia seca y 4.41 Ton/ha de grano. En cuanto a prolificidad mostró como mejores genotipos el vera 225 con 1 mazorca por planta, siendo el segundo genotipo en producción de materia fresca y uno de los mayores en producción de grano; en índice de grano se destaco el SNLP 111 con 82.87%, destacándose como el genotipo de mayor producción de grano. Con respecto a la materia seca de hoja/tallo/mazorca sobresalieron los genotipos CUBA 91 con 33.63%: 20.43%: 45.97% e ICA V 156 con 32.33%: 24.43%: 43.23% respectivamente. Conclusiones. Se cuenta con buenos genotipos de maíz para ser empleados por los ganaderos en procesos de ensilaje.
Roberto Cabrales,Rafael Montoya,Jaime Rivera M.
Revista MVZ Córdoba , 2007,
Abstract: Objetivo. Evaluar siete genotipos de millo y cinco genotipos de sorgo, para determinar el rendimiento forrajero y su utilidad en la alimentación de bovinos en el valle del medio Sinu. Materiales y métodos. Las semillas de sorgo y millo (Sorghum vulgare), fueron materiales híbridos y variedades tipo comercial. Se utilizó un dise o de bloques completos al azar con 4 cuatro repeticiones para millo y tres para sorgo. Resultados. Respecto al vigor los genotipos de millo que mejor comportamiento presentaron fueron el redondo cuba y blanco panoja larga; en sorgo el LC 603, el P-8239 y el DR-1125. Los millos que mostraron mayor senescencia fueron el cuarentano alto, el bastón y el blanco panoja larga; en sorgo los de mayor senescencia fueron el P-8239, el LC603 y el 74 CO. La mayor producción de forraje verde y materia seca la presentaron los genotipos de millo, el batea cuba, el redondo cuba y el blanco panoja larga, los de sorgo fueron el blanco criollo y el DR-1125. El mayor rendimiento de grano fue de los genotipos el batea cuba y bastón en millo, y en sorgo fueron DR-1125 y LC 603. Se seleccionaron como materiales de buen comportamiento dentro de todos los evaluados el batea cuba, redondo cuba, y blanco panoja larga en millo y el blanco criollo y DR-1125 en sorgo. Conclusiones. Los genotipos de millo que mejor comportamiento presentaron fueron en su orden por rendimiento (ton/ha): el batea cuba, el redondo cuba y el blanco panoja larga (ton/ha), obteniéndose una mayor capacidad de carga animal. Los genotipos de mejor comportamiento de sorgo fueron el blanco criollo y el DR-1125.
Towards a Proper Assignment of Systemic Risk: The Combined Roles of Network Topology and Shock Characteristics
Lasse Loepfe, Antonio Cabrales, Angel Sánchez
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077526
Abstract: The 2007-2008 financial crisis solidified the consensus among policymakers that a macro-prudential approach to regulation and supervision should be adopted. The currently preferred policy option is the regulation of capital requirements, with the main focus on combating procyclicality and on identifying the banks that have a high systemic importance, those that are “too big to fail”. Here we argue that the concept of systemic risk should include the analysis of the system as a whole and we explore systematically the most important properties for policy purposes of networks topology on resistance to shocks. In a thorough study going from analytical models to empirical data, we show two sharp transitions from safe to risky regimes: 1) diversification becomes harmful with just a small fraction (~2%) of the shocks sampled from a fat tailed shock distributions and 2) when large shocks are present a critical link density exists where an effective giant cluster forms and most firms become vulnerable. This threshold depends on the network topology, especially on modularity. Firm size heterogeneity has important but diverse effects that are heavily dependent on shock characteristics. Similarly, degree heterogeneity increases vulnerability only when shocks are directed at the most connected firms. Furthermore, by studying the structure of the core of the transnational corporation network from real data, we show that its stability could be clearly increased by removing some of the links with highest centrality betweeness. Our results provide a novel insight and arguments for policy makers to focus surveillance on the connections between firms, in addition to capital requirements directed at the nodes.
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