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Search Results: 1 - 10 of 517680 matches for " Rodríguez A. Carlos Alfonso "
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Apreciaciones sobre el contexto sociocultural del VIH-Sida en las comunidades indígenas en Colombia
Betancourt Rodríguez, Carlos Fabian;Pinilla Alfonso, María Yaneth;
Desacatos , 2011,
Abstract: this paper introduces some perceptions around social and cultural aspects involved in the sexual and reproductive health of piaroa, curripaco, piapoco, paez, guambiano and tikuna indigenous communities in colombia. the researchers made workshops to prevent hiv/aids and observed that the communities suffer illness related with poverty, forced displacement and armed conflict. they found that myths, beliefs and traditions make the inclusion of prevention strategies to hiv/aids more difficult. there are situations like gender inequality and homophobia which increase the vulnerability of men having sex with men and of women to hiv/ aids and sexually transmitted disease (std).all this, inside of the frame of the ethnic panorama.
La fototeca de la Facultad de Humanidades de la Universidad Autónoma del Estado de México
María Eugenia Rodríguez Parra,Carlos Alfonso Ledesma Ibarra
Contribuciones desde Coatepec , 2011,
Abstract:
Procedimiento para el dise o de un sistema de calentamiento solar-mixto de aire que utiliza agua como fluido de trabajo
Boada E. Luis Francisco,Rodríguez A. Carlos Alfonso,Salazar L. Luz Marina
Ingeniería e Investigación , 1983,
Abstract: En este artículo se describe un sistema solar-mixto de calefacción de aire que incorpora colectores planos calentadores del agua, un tanque acumulador de calor y un dispositivo para el intercambio de calor agua-aire. Se presentan los ensayos que determinaron la disposición óptima del equipo para el intercambio de calor con flujo de agua por termosifón y el comportamiento térmico para diferentes flujos de aire, así como los ensayos para conocer el comportamiento del sistema de calentamiento solar de agua. Finalmente, el dise o se efectúa mediante un programa de computador adaptado para tal fin.
SnO2 COMO CATALIZADOR Y SOPORTE DE Ni Y Sn EN LA ALCOHOLISIS DEL ACEITE DE PALMA
CARLOS E. ARARAT,JORGE E. RODRíGUEZ,LUIS A. VARGAS,ALFONSO E. RAMIREZ
DYNA , 2011,
Abstract: El óxido de esta o en forma de SnO2 (casiterita) ha sido usado como catalizador en diferentes procesos de interés de la industria química, tales como la de deshidrogenación, cracking, isomerización y oxidación de hidrocarburos. En este trabajo se estudió la aplicación de SnO2 como catalizador y como soporte de especies de níquel y esta o, en la alcohólisis del aceite de palma. La obtención del SnO2 se realizó por el método de precipitación y la incorporación de níquel y esta o, al soporte, por el método de impregnación. Se determinó que el SnO2 presentaba una mayor actividad frente a la reacción de alcohólisis en comparación con otros óxidos, tal como el MgO, y que esta actividad era afectada por la adición de níquel y esta o en su superficie. Se utilizó cromatografía de gases CG para el seguimiento de las reacciones, así como la espectroscopia FTIR para realizar el análisis de los productos obtenidos después del proceso. Los catalizadores fueron analizados por DRX para la determinación de las fases cristalinas presentes y del análisis de área superficial, volumen y tama o de poro, para determinar las propiedades texturales de los catalizadores.
SnO2 COMO CATALIZADOR Y SOPORTE DE Ni Y Sn EN LA ALCOHOLISIS DEL ACEITE DE PALMA
ARARAT,CARLOS E.; RODRíGUEZ,JORGE E.; VARGAS,LUIS A.; RAMIREZ,ALFONSO E.; URRESTA,JULIáN D.;
DYNA , 2011,
Abstract: tin oxide in the form of sno2 (cassiterite) was used as catalyst in various processes of interest in the chemical industry, such as dehydrogenation, cracking, isomerization and oxidation of hydrocarbons. in this paper, it was study the application of sno2 as catalyst and as support of nickel and tin species in the alcoholysis of palm oil. sno2 was obtained by precipitation method and the incorporation of tin and nickel to the support, by the impregnation method. sno2 was found that showed greater activity against the alcoholysis reaction in comparison with other oxides, such as mgo, and that this activity was affected by the addition of nickel and tin on the surface. gas chromatography was used for monitoring gc reactions and ft-ir spectroscopy for the analysis of products obtained after processing. the catalysts were analyzed by xrd to determine the crystalline phases present and the analysis of surface area, pore volume and size, to determine the textural properties of the catalysts.
Derrame pleural: marcadores bioquímicos en el enfoque diagnóstico
Páez Prats,Isidoro A.; Pino Alfonso,Pedro P.; Rodríguez Vázquez,Juan C.; Gassiot Nu?o,Carlos;
Revista Cubana de Medicina , 1998,
Abstract: the main characteristics of the normal pleural fluid, as well as the different mechanisms leading to the formation of a pleural effusion were described. a diagnostic strategy was presented starting from the separation of transudates and exudates. their diagnostic criteria were also defined. those biochemical markers that are most commonly used in the medical practice were reviewed, and the utility of each of them for the diagnosis of different diseases causing pleural effusion was specified. the limitations of these markers and the importance of their rational use according to the clinical data of every case were explained.
Evaluation of the Quality of Service of Voice Over Internet Protocol (VoIP) Using Active Queue Management (AQM) Evaluación de la calidad de servicios de VoIP en presencia de AQM
Vitalio Alfonso Reguera,Félix F. álvarez Paliza,Pedro Arco Ríos,Carlos A. Rodríguez López
Revista Cubana de Ingeniería , 2010, DOI: 10.1234/rci.v1i2.15
Abstract: This paper presents a comprehensive study about the impact of active queue management (AQM) on Voice over Internet Protocol (VoIP) quality of service. One of the most representative AQM scheme is analyzed through extensive simulation and its effect on the perceived quality of voice calls is evaluated. Different network scenarios, changing network loads and different scheme control parameters are investigated. Network impairments are related to user perception by means of well known algorithmic models, expressing user satisfaction in the MOS scale. The main results obtained show that the use of active queue management schemes like adaptive random early detection (ARED) significantly improve the perceived quality of voice calls. Se presenta un comprensivo estudio sobre el impacto del manejo activo de colas (AQM) en la calidad de servicio de las aplicaciones de voz sobre IP (VoIP). Se analiza uno de los algoritmos AQM más representativos mediante extensas simulaciones, evaluando su efecto en la calidad de voz percibida. Diferentes escenarios de red son investigados cambiando la carga de tráfico y alterando los parámetros de control. La degradación de la transmisión es vinculada a la percepción de los usuarios por medio de modelos algorítmicos bien conocidos, expresando la satisfacción de estos en la escala MOS. Los principales resultados obtenidos muestran que el uso de mecanismos para el manejo activo de colas, como el de detección temprana aleatoria en su versión adaptativa (ARED), mejora significativamente la calidad de voz percibida.
Derrame pleural: marcadores bioquímicos en el enfoque diagnóstico
Isidoro A. Páez Prats,Pedro P. Pino Alfonso,Juan C. Rodríguez Vázquez,Carlos Gassiot Nu?o
Revista Cubana de Medicina , 1998,
Abstract: Se describieron las principales características del líquido pleural normal y los diferentes mecanismos que conducen a la formación de un derrame pleural. Se presentó una estrategia diagnóstica a partir de la diferenciación de trasudados y exudados. Se definieron sus criterios diagnósticos. Se revisaron los marcadores bioquímicos de uso más frecuente en la práctica médica y se especificó la utilidad de cada uno para el diagnóstico de las diferentes entidades que causan derrame pleural. Se aclararon las limitaciones de estos marcadores y la importancia de su uso racional a partir de los datos clínicos de cada caso. The main characteristics of the normal pleural fluid, as well as the different mechanisms leading to the formation of a pleural effusion were described. A diagnostic strategy was presented starting from the separation of transudates and exudates. Their diagnostic criteria were also defined. Those biochemical markers that are most commonly used in the medical practice were reviewed, and the utility of each of them for the diagnosis of different diseases causing pleural effusion was specified. The limitations of these markers and the importance of their rational use according to the clinical data of every case were explained.
Ascitis quilosa tras nefrectomía radical y linfadenectomía retroperitoneal
Rodríguez Alonso,Andrés; González Blanco,Alfonso; Barbagelata López,Alfonso; Bonelli Martín,Carlos; Fernández López,María; Cuerpo Pérez,Miguel A.;
Actas Urológicas Espa?olas , 2009, DOI: 10.4321/S0210-48062009000200016
Abstract: chylous ascites consists of the accumulation of chyle in the abdominal cavity. postoperative presentation develops as a consecuence of unrecognized injury of cisterna chyli or one of its major lumbar tributaries. it usually present as abdominal distention and pain or drainage of milky fluid from surgical wound or abdominal drain. diagnosis is established by cytochemical analysis of fluid and staining with sudan iii, that shows fat globules, leukocytes with lymphocytic predominance and a high triglyceride content. we present a case of postoperative chylous ascites following radical nephrectomy and retroperitoneal lymphadenectomy for renal cancer, which successfully respond to conservative measures: total parenteral nutrition and octreotide.
Comparación entre 2 cultivares de Calendula officinalis l
Fuentes Fiallo,Víctor R; Lemes Hernández,Ciro M; Reyes,Mireya; Méndez Jorrín,Gladys; Alfonso Borrego,Juan Carlos; Rodríguez Ferradá,Carlos A;
Revista Cubana de Plantas Medicinales , 2000,
Abstract: calendula officinalis l. is one the species approved by cuban public health ministry, to be used as raw material in making of phytodrugs in our country. traditionally, researches and use of this species, have been referred in farming of "fiesta gitana", established in cuba for a long time. in 1996, farming of "radio" was introduced in cuba for the production of this species. a morphological, agronomical, and phytochemical comparison, stablish a well marked differences between both farmings. results of comparison, advantages and disadvantages of introduction of new farming in the country, are showed, as well as possibilities to produce seeds of this species in cuba.
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