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Search Results: 1 - 10 of 8978 matches for " Rubí Romero "
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Rese a de "De la Iglesia indiana. Homenaje a Elsa Cecilia Frost" de Patricia Escandón [coord.]
José Rubén Romero
Latinoamérica. Revista de estudios Latinoamericanos , 2007,
Abstract:
Amor y desamor: vivencias de parejas en la sociedad novohispana
Romero José Rubén
Anuario Colombiano de Historia Social y de la Cultura , 1996,
Abstract: Seminario de historia de las mentalidades. Amor y desamor: vivencias de parejas en la sociedad novohispana. México: INAH, 1993, 184 páginas.
Planeamiento de la expansión de sistemas de transmisión de energía eléctrica considerando demanda variable
Luis Alfonso Gallego P.,Rubén Romero
Scientia Et Technica , 2007,
Abstract: Los modelos matemáticos tradicionales para el planeamiento de sistemas de transmisión, normalmente consideran la demanda de manera estática, es decir, mediante un valor fijo en el futuro. Realmente, la demanda futura del sistema es una variable aleatoria, la cual no se puede determinar en forma exacta y que requiere de técnicas de predicción que están sujetas a errores denominados incertidumbre . En este artículo se presenta un modelo matemático y la metodología de solución para el planeamiento de sistemas de transmisión cuando se considera la demanda como una variable aleatoria que esta dentro de un rango probable de ocurrencia.
Identificación de los principales factores que afectan el desempe?o competitivo del subsector avícola en el Valle del Cauca (Colombia)
Echeverry Romero,Rubén Darío; Silva Castellanos,Tulio Ferney;
Pensamiento & Gestión , 2009,
Abstract: in this paper a contribution to the competitive socio-cultural perspective is developed through an analytical scheme that allows to identify limiting factors to the competitive capacity of region vulnerable economical sectors. it is based on the cultural anthropology analytical proposal that considers the ecology, the social structure, and the ideology as determinant factors of socio-cultural systems that let describe, explain, and classify communities and their dynamics. based upon identification of poultry sector in the valle del cauca region (colombia), on its vulnerability, and on its importance as an alternative to the region productive platform diversification, geo-economical and sociopolitical factors schemes were applied. this exercise was complemented with consultancies to the sector's entrepreneurs who not only validated the factors found with their opinion but they also intervened on neuralgic points of strategic action definition.
Identificación de los principales factores que afectan el desempe o competitivo del subsector avícola en el Valle del Cauca (Colombia) Identification of the main factors affecting the competitive performance of the poultry subsector in the Valley of Cauca (Colombia)
Rubén Darío Echeverry Romero,Tulio Ferney Silva Castellanos
Pensamiento & Gestión , 2009,
Abstract: En este trabajo se realiza una contribución a la perspectiva sociocul-tural de la competitividad a través de un esquema analítico que permite identificar factores limitantes a la competitividad de sectores económicos vulnerables en las regiones. Este esquema se basa en la propuesta analítica de la antropología cultural que considera que la ecología, la estructura social y la ideología son los factores determinantes de la evolución de los sistemas socioculturales, por lo que el análisis de estos permite describir, explicar y clasificar las comunidades y su dinámica. A partir de la identificación del sector avícola en la región del Valle del Cauca (Colombia), de su vulnerabilidad, pero también de su importancia como alternativa para la diversificación de la plataforma productiva de la región, se aplicó el esquema de análisis de los factores geoeconómicos y sociopolíticos. Este ejercicio se complementó con las consultas a los empresarios del sector, que no solamente validaron con sus opiniones los factores encontrados, sino que también intervinieron en el establecimiento de los puntos neurálgicos de acción estratégica. In this paper a contribution to the competitive socio-cultural perspective is developed through an analytical scheme that allows to identify limiting factors to the competitive capacity of region vulnerable economical sectors. It is based on the cultural anthropology analytical proposal that considers the ecology, the social structure, and the ideology as determinant factors of socio-cultural systems that let describe, explain, and classify communities and their dynamics. Based upon identification of poultry sector in the Valle del Cauca Region (Colombia), on its vulnerability, and on its importance as an alternative to the region productive platform diversification, geo-economical and sociopolitical factors schemes were applied. This exercise was complemented with consultancies to the sector's entrepreneurs who not only validated the factors found with their opinion but they also intervened on neuralgic points of strategic action definition.
Intervencionismo en oclusiones crónicas: evaluación de la efectividad cruce de distintas guías y balones según complejidad Percutaneous coronary interventions in chronic coronary occlusions: effectiveness of different guides and balloons according to complexity of total coronary artery occlusion
Pablo Pedreros,Rubén Lamich,Arnoldo Aguirre,Carlos Romero
Revista Chilena de Cardiología , 2010,
Abstract: Antecedentes: El intervencionismo en las oclusiones totales crónicas (OTC) requiere técnicas complejas y el éxito es poco predecible. Es útil identificar la efectividad de las guías de cruce y del balón para el intervencionismo en distintos niveles de complejidad de OTC. Objetivos: Evaluar la efectividad de cruce de distintas guías y balones en el tratamiento de OTC. Métodos: Se revisa en forma retrospectiva la efectividad de distintos tipos de guías y balones de cruce utilizados en intervencionismo de OTC efectuados entre agosto de 2007 y agosto de 2009. Se define "efectividad" como la capacidad de avanzar y cruzar la oclusión crónica con la guía y el balón, ambas necesarias para efectuar la angioplastia de la OTC. Se agrupan los resultados según el nivel de complejidad de la OTC de acuerdo a score propio, distinguiendo entre OTC simples, complejas y de alta complejidad. Resultado: En el período estudiado se revisan 90 OTC. Se utilizan 148 guías (1,6 guía/proc.) y se utilizan 92 balones en 76 procedimiento que logran paso efectivo de guía. (1,2 bal/proc). Se realiza una tabla con la tasa de efectividad de distintas guías y balones de cruce. Destaca la utilidad de guía PT2 en lesiones simples y complejas, como la utilidad de la guía Miracle 6 en OTC de alta complejidad. Conclusiones: En OTC se obtiene un éxito de 67% en nuestro medio, con mayor efectividad de la guía PT2 en lesiones simples y complejas y de Miracle 6 en lesiones de alta complejidad. En cuanto a balones se obtiene mayor efectividad en los tipo Maverick, Mercury y Voyaguer de 1,5 mm en lesiones simples y complejas, como del Balón Maverick de 1,5 mm en lesiones de alta complejidad. Es de gran utilidad un registro de la efectividad de balones y guías en el tratamiento de OTC, lo que permite al intervencionista una adecuada elección del material con el consecuente ahorro de tiempo y mayor efectividad del procedimiento. Background.: PCI in chronic coronary occlusions requi-res complex techniques and is associated to less predictable results. It is important to evalúate the effectiveness of different guides and balloons in PCI for total coronary occlusion (TCO). Aim: To evalúate the effectiveness of different guides and balloons in the treatment of TCO. Methods: A retrospective review of the effectiveness of different guides and balloons in the treatment of TCO perfor-med from 2007 to 2009 was carried out Effectiveness was defined as the ability to traverse the occlusion with the guide and the balloon. The analysis was performed according to groups defined by the complexity of the TCO as assess
Evaluación a largo plazo del impacto funcional y estructural de la arteria radial post acceso en intervencionismo coronario Long term evaluation of functional and structural changes of the radial artery used as access for cardiac interventional procedures
Pablo Pedreros,Rubén Lamich,Amoldo Aguirre,Carlos Romero
Revista Chilena de Cardiología , 2010,
Abstract: Resumen: Antecedentes: El acceso radial es una alternativa aceptable y segura para procedimientos endovasculares. Sin embargo no existe una clara evaluación de la integridad de la arteria radial (AR) post procedimiento. Objetivo: Evaluar el impacto funcional y estructural a largo plazo de la punción y colocación del introductor vascular en arteria radial (AR) post intervencionismo coronario. Método: Se estudian 33 pacientes con cardiopatía coronaria a quienes se realizó coronadografía y/o angioplastía vía radial. A los 6-10 meses de seguimiento se analizó las características ecográficas funcionales y estructurales de la AR comparándola con la AR contralateral. Resultados: Con el seguimiento se observan 3 AR ocluidas (9%). No se encontró un aumento significativo del grosor de la pared a nivel distal (zona de punción), 0,36 ± 0,22 vs 0,28 ± 0,08mm; el diámetro fue similar a nivel distal 2,6 ± 0,7mm vs 2,8 ± 0,35mm (ns) y proximal 2,8 ± 0,35 vs 2,5 ± 0,7mm. No hay diferencia significativa en la velocidad peak sistólica (VPS), en la AR puncionada vs la control 54 ± 16 vs 50 ± 14 cm/seg ni en los índices de resistencia 0,83 ± 0,1 vs 0,87 ±0,1. Conclusiones: La utilización de la vía radial para intervencionismo coronario ocasiona en un bajo porcentaje la oclusión esta arteria. En las arterias que permanecen permeables no se encontró a largo plazo un impacto sobre las características estructurales ni funcionales. Background: the radial artery is a common and safe access site for endovascular procedures. There has been no adequate evaluation of the radial artery integrity following the procedure. Aim: to evaluate the long term functional and structural status of the radial artery use for cardiac interventional procedures Methods: 33 patients with coronary artery disease had coronary angiography and/or PTCA using the radial artery approach. After 6-10 months the functional and structural status of the artery was evaluated by comparison to the contra lateral artery Results: Three (9%) arteries were occluded. No thickening of the arterial wall distal to the puncture site was observed. Diameters were 2.6 ± 0.7 vs 2.8 ± 0.35mm (punctured vs control) distally and 2.8 ± 0.35 vs 2.5 ± 0.7mm proximally. Respective peak systolic flow velocities were 54 ± 16 vs 50 ± 14 cm/sec (NS) and resistance indexes were 0.83±0.1 compared to 0.67±0.1 (NS) Conclusion: A low % of radial arterial occlusion is observed following use of the radial artery following cardiovascular interventions. Patent arteries showed no structural or functional limitations at long term evaluation.
PLANEJAMENTO DA EXPANS O DE SISTEMAS DE TRANSMISS O DE ENERGIA ELéTRICA COM BUSCA EM VIZINHAN A VARIáVEL
Silvia Lopes de Sena Taglialenha,Rubén Romero
Colloquium Exactarum , 2010, DOI: 10.5747/ce.2010.v02.n1.e010
Abstract: The static long-term power transmission network expansion planning problem consists in, given an initial configuration and the generation data and demand of the planning horizon, operation limits, costs and investment restrictions, to determine the expansion plan with a minimal cost, in other words, should be determined where and what type of equipments should be correctly installed for the system to operate assisting the needs of the electric power market. It is an integer nonlinear problem with high complexity for systems of great load, presenting the phenomenon of combinatorial explosion and with the added difficulty of being multimodal, then being too complex to be solved by traditional optimization techniques. To solve this problem we applied the metaheuristic Variable Neighborhood Search, which is based on a simple beginning: Systematic changes of neighborhood within a local search. We present obtained results using available nets of medium sized networks available in the literature, which show that this metaheuristic is robust and competitive both in terms of quality and processing time.
Degradation of Indigo Carmine Using Advanced Oxidation Processes: Synergy Effects and Toxicological Study  [PDF]
Elba Ortiz, Violeta Gómez-Chávez, Carlos M. Cortés-Romero, Hugo Solís, Rubén Ruiz-Ramos, Sandra Loera-Serna
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.712137
Abstract:
The physicochemical degradation of Indigo Carmine (IC) dye in aqueous solution was performed using single and combined Advanced Oxidation Processes (AOP’s). Photocatalysis (TiO2-UV), Ozonation (O3) and Sonolysis (SN) were tested either in a standalone methodology or by combination of two simultaneous AOP’s. The dye conversion was followed by both measurements: 1) color removal determined by UV-VIS spectrometry and 2) organic and inorganic load determined by the chemical oxygen demand (COD). A complete and quick color disappearance of model water waste has been obtained by using combination of non-irradiated AOP’s, namely, O3/SN, which contrasts to the combination of irradiated photocatalysis with O3 or sonolysis. Color removal with simultaneous TiO2-UV/SN reached 77% while TiO2-UV/O3 reached 96% at similar reaction time. On the other hand, the standalone O3 yielded the highest color removal (94.4%) in 32 minutes whereas SN reached only 39.2% in 4 hours. The standalone light irradiated TiO2-UV reached 93.3% color re-moval in one hour of reaction time. These results indicated that non-irradiated (SN and O3) enhance synergistic effects that provoke structural changes in dye molecule without reaching total degradation. This is evidenced from FTIR of residuals from reaction mixture in which it has been observed the presence of organic molecules such as aromatics, sulfonic and amines refractory compounds that are mechanisti-cally possible to be found during IC degradation. Also, toxicity tests (MicroTox
Otra historia de la investigación científica en México: El Instituto Mexicano del Seguro Social
Licea de Arenas,Judith; Arenas Vargas,Miguel; González,Eric; Romero,Rubén D;
ACIMED , 2008,
Abstract: background: the impoverishment of mexicans has deepened the gap that separates them from wellbeing. the pathologies of poverty and those of the developed countries coexist. therefore, scientific research is seen as a possible contribution to the prevention of illnesses. objective: to conduct a metrical exercise using as an object of study the mexican social security institute (imss), the institution that provides healthcare to the majority of the mexican population to find out its research performance. it is expected that the x-ray obtained will contribute to a diagnosis of the research conducted by the institute. methods: through the web of science the cited articles of the personnel assigned to the mexican social security institute that were published in the mainstream journals between 1995 and 1999, the last five-year period of the governing party that ruled the country for 70 years, were identified. results: 581 papers were cite and the rate of annual publication was stable; however citations received were scarce. the most represented disciplines were experimental medicine, endocrinology, general and internal medicine, rheumatology and genetics. conclusions: the mexican social security institute has capacity, competitiveness and stability to conduct research; however the poverty suffered by millions of mexicans, related to hunger, malnutrition and the consequent lack of health make necessary a change of its orientation
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