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Search Results: 1 - 10 of 673524 matches for " María J. Jorge "
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Thermal Decomposition of Diphenyl Tetroxane in Chlorobenzene Solution  [PDF]
Alexander G. Bordon, Andrea N. Pila, Mariela I. Profeta, María J. Jorge, Lilian C. Jorge, Jorge M. Romero, Nelly L. Jorge
International Journal of Organic Chemistry (IJOC) , 2019, DOI: 10.4236/ijoc.2019.91001
Abstract: The thermal decomposition of Cyclic Diperoxide of Benzaldehyde 3,6-diphenyl-1,2,4,5-tetroxane, (DFT) in chlorobenzene solution in the studied temperature range (130°C - 166°C) satisfactorily satisfies a first order law up to 60% conversions of diperoxide. DFT would decompose through a mechanism in stages and initiated by the homolytic breakdown of one of the peroxidic bonds of the molecule, with the formation of the corresponding intermediate biradical. The concentration studied was very low, so that the effects of secondary reactions of decomposition induced by free radicals originated in the reaction medium can be considered minimal or negligible. The activation parameters for the unimolecular thermal decomposition reaction of the DFT are ΔH# = 30.52 ± 0.3 kcal·mol-1 and ΔS# = -6.38 ± 0.6 cal·mol-1 K-1. The support for a step-by-step mechanism instead of a process concerted is made by comparison with the theoretically calculated activation energy for the thermal decomposition of 1,2,4,5-tetroxane.
Sección bibliográfica
Melo Jorge Orlando,María Carlos J.
Anuario Colombiano de Historia Social y de la Cultura , 1963,
Abstract: Los Grandes Conflictos Sociales y Económicos de Nuestra Historia. Lievano Aguirre, Indalecio. / Los Temas Sociales y Económicos en la época de la independencia. Griffin, Charles C. / La Marina Real Británica y la liberación de Suramérica. Humphrey, Robert A. / índice de "El Repertorio Colombiano”. Ortega Torres, José. / Juan Manuel Rosas. Abadía Méndez, Miguel. / índice del "Papel Periódico Ilustrado" y de Colombia Ilustrada". Ortega Torres, José J. / Codazzi, Humboldt, Ca1das: Precursores de la Geografía Moderna. Vila, Pablo. / Obras. Domínguez Camargo, Hernando. / Nari o, una conciencia criolla contra la tiranía. Miramón, Alberto. / Nari o Periodista. Restrepo Canal, Carlos. / El periodismo en la Nueva Granada: 1810-1811. Martínez Delgado, Luis; Ortiz, Sergio Elías. / Memorias sobre la revo1ución y sucesos de Santa fe de Bogotá, en el trastorno de la Nueva Granada y Venezuela. Torres y Pe a, José Antonio de. / Génesis de la revolución del 20 de julio de 1810. Ortiz, Sergio Elías. / 1818 Guerra de Independencia. Vergara y Velasco, F.J. / Timaná. De Belalcázar a la Gaitana: parábola de violencia y libertad. Gómez Picón, Rafael. / Seudónimos Colombianos. Pérez Ortiz, Rubén.
A Metamodel for Agile Requirements Engineering  [PDF]
Eva-Maria Sch?n, Jorge Sede?o, Manuel Mejías, J?rg Thomaschewski, María José Escalona
Journal of Computer and Communications (JCC) , 2019, DOI: 10.4236/jcc.2019.72001
Abstract: Value delivery is becoming an important asset for an organization due to increasing competition in industry. Therefore, companies apply Agile Software Development (ASD) to be more competitive and reduce time to market. Using ASD for the development of systems implies that established approaches of Requirements Engineering (RE) undergo some changes in order to be more flexible to changing requirements. To this end, the field of agile RE is emergent and different process models for agile RE have arisen. The aim of this paper is to build an abstract layer about the variety of existing process models by means of a metamodel for agile RE. It has been created in several iterations and relies on the evaluation of related process models. Furthermore, we have derived process models for agile RE in industry by presenting instances of the metamodel in two different cases: one is based on Scrum whereas the other is based on Kanban. This paper contributes to the software development body of knowledge by delivering a metamodel for agile RE that supports researchers and practitioners modeling and improving their own process models. We can conclude that the agile RE metamodel is highly relevant for the industry as well as for the research community, since we have derived it following empirical research in the field of ASD.
El urbanismo Inka y su vinculación con mesoclimas en el sitio "El Shincal de Quimivil" (Provincia de Catamarca, Argentina)
Capparelli,Aylen; Frangi,Jorge L.; Kristensen,María J.;
Intersecciones en antropolog?-a , 2006,
Abstract: the inkas managed the environment of the different regions they occupied based on their astronomical and agroecological knowledge, especially in relation to maize. surplus production was redistributed through a well developed storage system. within this framework, we propose that the inkas used their knowledge of different habitats and associated ecological factors to plan and guarantee the smooth functioning of each architectonic unit at every administrative center. therefore, our goal was to establish if there is a connection between different mesoclimatic conditions at el shincal inka site (catamarca, argentina) and the spatial distribution of three different architectural-functional structures (grain storage, residence, and cultivation) and a control (the plaza). six climatic variables were studied through uni and multivariate analysis. the storage area presented the best conditions for drying and preserving crop grains: the highest soil temperature, evaporative capacity, and water vapor saturation deficit of the air. the residential area showed low evaporative capacity and water vapor saturation deficit during spring and summer, making it a more comfortable place under high seasonal air temperatures. the cultivation area presented lower air evaporative capacity during days with zonda (regional wind with foehn-like effect) and generally a mild mesoclimate that fits better the requirements of maize agroecology.
El urbanismo Inka y su vinculación con mesoclimas en el sitio "El Shincal de Quimivil" (Provincia de Catamarca, Argentina) Inka urbanism associated with mesoclimatic conditions at the site "El Shincal de Quimivil" (Catamarca province, Argentina)
Aylen Capparelli,Jorge L. Frangi,María J. Kristensen
Intersecciones en Antropología , 2006,
Abstract: Los Inkas gestionaron el ambiente, de las distintas regiones que ocuparon, sobre la base tanto de sus conocimientos astronómicos -solares y lunares- como de aquellos referidos a la ecología y calendario agrícola -del maíz en especialde cada región. La producción excedente de una población se redistribuía luego en base a un sistema de almacenaje propio de este Estado. Dentro de este marco, se propone que el conocimiento de la diversidad de hábitats, y de los factores ecológicos a ellos asociados, les sirvió a los Inkas para planificar y garantizar el buen funcionamiento de cada unidad arquitectónica en cada centro administrativo. Por lo tanto, el objetivo principal de este trabajo es determinar si existe alguna vinculación entre las distintas condiciones mesoclimáticas que se encuentran en el lugar de implantación del sitio Inka El Shincal de Quimivil (Catamarca, Argentina) y la distribución espacial de tres sectores arquitectónicofuncionales diferentes (almacenaje, habitacional, cultivo) y un testigo (plaza). Se analizaron en forma univariada y multivariada 6 variables climáticas. Por sus altos valores de déficit de saturación de vapor del aire (DS), capacidad evaporante del aire y temperatura del suelo, el sector de almacenaje resultó el sector más propicio para lograr el secado y la preservación de los granos. El sector habitacional, mostró bajos DS y capacidad evaporante en primavera y verano, lo que contribuyó a condiciones más confortables bajo las elevadas temperaturas de esas estaciones. El sector cultivos, tuvo baja capacidad evaporante durante días con Zonda, y su mesoclima generalmente moderado, es el que más se ajusta a los requerimientos agroecológicos del maíz. The Inkas managed the environment of the different regions they occupied based on their astronomical and agroecological knowledge, especially in relation to maize. Surplus production was redistributed through a well developed storage system. Within this framework, we propose that the Inkas used their knowledge of different habitats and associated ecological factors to plan and guarantee the smooth functioning of each architectonic unit at every administrative center. Therefore, our goal was to establish if there is a connection between different mesoclimatic conditions at El Shincal Inka site (Catamarca, Argentina) and the spatial distribution of three different architectural-functional structures (grain storage, residence, and cultivation) and a control (the plaza). Six climatic variables were studied through uni and multivariate analysis. The storage area presented the best conditi
Tres casos de síndrome granuloma leproide canino en Tandil, Buenos Aires, Argentina
María C. Jorge,María J. Traversa,Karina C. Fresneda,Jorgelina Belsito
Ciencia, Docencia y Tecnología , 2009,
Abstract: El síndrome granuloma leproide canino (SGLC) es una afección nodular piogranulomatosa que afecta al tejido cutáneo y subcutáneo de los caninos, ocasionado por Mycobacterium sp. Las lesiones se caracterizan por nódulos simples o múltiples localizados en cabeza, hocico, orejas, miembros torácicos y tronco. El diagnóstico de laboratorio se realiza por citología, histopatología y evidencia del agente causal; por PCR se demostró una secuencia novel Mycobacterium sp. En este trabajo se describen tres casos de SGLC confirmados por coloración de Ziehl Neelsen y citología. El tratamiento con rifampicina y claritromicina combinadas fue exitoso en el 100% de los casos. Precisar la identificación taxonómica del agente causal permitirá determinar los requerimientos de cultivo, facilitando la prevención, tratamiento y control de la enfermedad.
Power Grounding Optimization  [PDF]
Eduardo A. Cano-Plata, Oscar J. Soto-Marín, Guillermo Jiménez-Lozano, Jorge H. Estrada-Estrada
American Journal of Computational Mathematics (AJCM) , 2015, DOI: 10.4236/ajcm.2015.53021
Abstract: In this paper we discuss the finite element models (FEM) using electromagnetic theory—Maxwell’s equations. Next we developed a new procedure for optimization with the idea to be implemented in the standard IEEE-80 (2013). We expose those ideas in the paper. ETAP program and Matlab software are used for FEM.
Enol and Enethiol Occurrence for Some Ketones and Thioketones. Mass Spectrometry and Theoretical Calculations
Patricia E. Allegretti,María de las Mercedes Schiavoni,María Susana Cortizo,Eduardo A. Castro,Jorge J. P. Furlong
International Journal of Molecular Sciences , 2004, DOI: 10.3390/i5110294
Abstract: The mass spectra of ketones can provide valuable information with regards to keto-enol equilibria occurring in the gas phase. Mass spectra of selected ketones and thioketones have been analysed and specific fragmentation assignments have been done to characterised and weigh co-existing keto and enol tautomers. Thioketones are of particular interest due to their tendency to shift the tautomeric equilibrium towards the enethiol form. The predictive value of this methodology is not only supported by the influence of these compound’s nature and size of the substituent on these equilibria but also by the good correlation found between the selected fragments abundances ratio and semi-empirical calculation (AM1) of the corresponding heats of tautomerization.
A Kowalski-S?odkowski theorem for 2-local $^*$-homomorphisms on von Neumann algebras
María Burgos,Francisco J. Fernández-Polo,Jorge J. Garcés,Antonio M. Peralta
Mathematics , 2014,
Abstract: It is established that every (not necessarily linear) 2-local $^*$-homomorphism from a von Neumann algebra into a C$^*$-algebra is linear and a $^*$-homomorphism. In the setting of (not necessarily linear) 2-local $^*$-homomorphism from a compact C$^*$-algebra we prove that the same conclusion remains valid. We also prove that every 2-local Jordan $^*$-homomorphism from a JBW$^*$-algebra into a JB$^*$-algebra is linear and a Jordan $^*$-homomorphism.
Comparative in vitro study of the antimicrobial activities of different commercial antibiotic products of vancomycin
Jorge A Diaz, Edelberto Silva, Maria J Arias, María Garzón
BMC Pharmacology and Toxicology , 2011, DOI: 10.1186/1472-6904-11-9
Abstract: Microbial assays were used to establish the potency, the Minimal Inhibitory Concentrations (MICs), the Minimal Bactericidal Concentration (MBCs), the critical concentrations, and the production of spontaneous mutants that are resistant to vancomycin.The microbial assay was validated in order to determine the Vancomycin potency of the tasted samples. All the products showed that have potency values between 90 - 115% (USP requirement). The products behave similarly because the MICs, The MBCs, the critical concentrations, the critical concentrations ratios between standard and samples, and the production of spontaneous mutants don't have significant differences.All products analyzed by microbiological tests, show that both trademarks and generics do not have statistical variability and the answer of antimicrobial activity Show also that they are pharmaceutical equivalents.Pharmaceutical products, especially antibiotics, must comply with standards of quality, efficacy and reliability, attributes that are determined by various authorities [[1,2], and [3]]. A discussion about the quality and efficacy of generic antibiotics has taken place in recent decades. This discussion has included presentations in congress and research articles in which the authors have shown that some products do not meet regulatory standards [4,5] and that their behavior is not similar in animal models [6,7]Some antibiotics must be analyzed using biological assays (e.g., penicillin, amikacyn, vancomycin, and neomycin) [2]. These products are measured by their potency or biological activity compared against an international standard. Therefore, the commercial products must be similar in composition to the international reference standard [7]. With antibiotics like vancomycin, if the commercial products do not fulfill the requirements of pharmacopeia, their behavior and performance could put a patient's health in danger.Biological assays and other analytical procedures must be validated before they a
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