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Search Results: 1 - 10 of 487319 matches for " Tania L. S. Miranda "
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Development of a New Bio-Based Insulating Fluid from Jatropha curcas Oil for Power Transformers  [PDF]
José M. G. Evangelista Jr., Fabrício E. Bortot Coelho, Juliana A. O. Carvalho, Estêv?o M. R. Araújo, Tania L. S. Miranda, Adriane Salum
Advances in Chemical Engineering and Science (ACES) , 2017, DOI: 10.4236/aces.2017.72018
Abstract: The present work aims to develop a new vegetable insulating fluid for power transformers based on Jatropha curcas oil. Besides its technical benefits, Jatropha curcas oil has a socio-economic role by promoting income to rural families, contributing to the countryside development and avoiding rural exodus. Thus, the entire transformer oil production (extraction, processing, characterization and accelerated aging) was covered and a new process was developed. For oil extraction, the most suitable process was the solvent extraction (5 mL of hexane per gram of crushed non-peeled seeds during 30 minutes) with an oil yield of 32%. In raw oil processing stage, the degumming, with 0.4 g of phosphoric acid per 100 g of oil, at 70°C, was used to remove phosphatides. Then, free fatty acids were 96% neutralized with a sodium hydroxide solution (0.5% w/w) at room temperature. For the oil clarification, the combination of 5% w/woil of activated carbon and 1% w/woil of MgO resulted in a bright, odorless and clear oil with an acid number of 0.04 mgKOH·g1. The oil drying in a vacuum rotary evaporator, at 70°C, for 2 hours reduced the water content to 177 ppm. The processed oil was characterized following ASTM D6871 methods. This oil presented higher dielectric breakdown voltage (55 kV) than commercial transformer fluids (BIOTEMP?, EnvirotempFR3?, and Bivolt?), which increases transformer safety, capacity and lifetime. In addition, the processed oil has a lower viscosity than BIOTEMP? fluid, which can enhance the heat dissipation efficiency in the transformer. Moreover, the processed oil flash and fire points of 310°C and >340°C, respectively, confirm the great security of vegetable insulating fluids. The analyzed properties of the processed oil fulfill all the ASTM D6871, ABNT NBR 15422 and IEC 62770 specifications. Therefore, Jatropha curcas oil is a potential substitute formineral insulating fluids.
Empoderamiento y cambio social a partir de la participación y el fomento de capacidades. Estudio de caso en tres cooperativas agropecuarias
Suset,A; Machado,Hilda; Miranda,Taymer; Campos,Maybe; Duquesne,P; Sánchez,Tania; Lamela,L; Mesa,A.R; Reyes,F; Nodarse,F; Sardi?as,J.A;
Pastos y Forrajes , 2010,
Abstract: in order to evaluate the potential of mulberry (morus alba var. cubana) for the supplementation of young grazing cattle and its effects on the productivity and health of the animals, this study was conducted at the eepf "indio hatuey" during the rainy season, with two treatments: the experimental group received 6 kg of fresh chopped mulberry and 500 g of concentrate/animal/day (a); while in the control group supplementation was 1 kg of concentrate/animal/day and pangola grass hay ad libitum (b). the bromatological and phytochemical composition of mulberry, live weight, mean daily gain (mdg) and fecal egg count (fec) of gastrointestinal nematodes in the animals were evaluated. significant differences (p<0,001) were observed in the live weight between treatments (186,06 vs 169,01 kg). likewise, a significant effect (p<0,05) of the mdg was detected, with values higher than 600 g in the supplemented animals. on the other hand, the fec showed significant differences (p<0,01) since the second month of evaluation, with stable performance and values lower than 100 epg in the experimental group. seven groups of secondary metabolites were found; the most representative ones were phenols, tripertene-steroids and flavonoids, which have therapeutical action on animals. the mulberry forage is concluded to show good nutritional characteristics that allow its inclusion in diets for grazing calves. in addition, good results in the live weight and mean daily gain can be obtained with supplementation.
La innovación y la transferencia de tecnologías en la Estación Experimental "Indio Hatuey": 50 a?os propiciando el desarrollo del sector rural cubano (Parte II)
Miranda,Taymer; Machado,Hilda; Suárez,J; Sánchez,Tania; Lamela,L; Iglesias,J. M; Suset,A; Pérez,A; Milera,Milagros; Martín,G. J; Campo,Maybe; López,O; Sánchez,Saray; Simón,L;
Pastos y Forrajes , 2012,
Abstract: the changes occurred in cuban agriculture at the end of the 20th century caused the rupture of the paradigm based on import dependence, for which it became necessary to begin building a new technical-economic model based on endogenous development, associated to the promotion of innovative capacities and sustainable technologies; this demanded that knowledge-development centers focused on the application of innovations, through adequate rural extension processes. in this sense, the experimental station "indio hatuey" focused the efforts on the promotion of innovation processes in cuban livestock production, which were enhanced at the beginning of the first decade of this millennium, when a turn occurred in the conventional technology transference system to promote innovation and rural local development. outstanding examples of the application of this approach are: the livestock production development program in the martí municipality, the enhancement of the processes of local agricultural innovation and of promotion of local innovation systems in the cooperative and farmer sector of matanzas province, as well as the integrated food and energy production on agroecological bases in five cuban provinces.
La Innovación y la transferencia de tecnologías en la Estación Experimental "Indio Hatuey": 50 a?os propiciando el desarrollo del sector rural cubano (Parte I)
Miranda,Taymer; Machado,Hilda; Suárez,J; Sánchez,Tania; Lamela,L; Iglesias,J. M; Suset,A; Pérez,A; Milera,Milagros; Martín,G. J; Campo,Maybe; López,O; Simón,L;
Pastos y Forrajes , 2011,
Abstract: with the triumph of the cuban revolution, the ministry of agriculture (minagri) created a centralized management and technological innovation system, which generated substantial changes in the farmers' living and working conditions. however, this enhancement had structural limitations that caused unfavorable economic and environmental consequences, which determined the need for a technological change in the cuban agriculture of the 1990's. this problem forced the knowledge development centers to search for new ways for the effective application of the innovations, an issue that was priority of the eepf "indio hatuey" since its creation. the highest impact generated by the station in terms of generalization of results was associated to the opportunities originated by the minagri with the creation of a system of agricultural extension in 1976-1980. the scientific results were focused on forage conservation, as strategy to relieve the feed deficit occurred every year, during the dry season. with the economic crisis of the 90's, a reconversion process began in the dairy cattle exploitation technologies. in the mid 90's, the silvopastoral system technology emerged, gradually introduced in 16 provinces of the country, with the advisory of a multidisciplinary group in charge of monitoring and feedback between the generating center and the receptors. nevertheless, to guarantee the sustainability of the dissemination of these systems, the availability of pasture seeds was a limiting factor. in spite of the novelty of the technologies generated by the institution, the adoption rate was not in correspondence with the real needs and the effort made by cuba to reverse the situation of livestock production. the institution searched for a new way to approach technology transference, visualizing it as a component of the rural territorial development which has determined the appropriation of new concepts and social constructions. studies were conducted in six municipalities of matan
La innovación y la transferencia de tecnologías en la Estación Experimental "Indio Hatuey": 50 a os propiciando el desarrollo del sector rural cubano (Parte II) Innovation and technology transference at the Experimental Station "Indio Hatuey": 50 years propitiating the development of the Cuban rural sector (Part II)
Taymer Miranda,Hilda Machado,J Suárez,Tania Sánchez
Pastos y Forrajes , 2012,
Abstract: Los cambios acontecidos en la agricultura cubana a finales del siglo XX provocaron la ruptura del paradigma basado en la dependencia de importaciones, por lo que se precisó comenzar a construir un nuevo modelo técnico-económico sobre la base del desarrollo endógeno, asociado al fomento de capacidades innovadoras y de tecnologías sostenibles; ello exigió que los centros de desarrollo de conocimiento se centraran en la aplicación de innovaciones, mediante adecuados procesos de extensión rural. En este sentido, la Estació n Experimental "Indio Hatuey" concentró los esfuerzos en el fomento de los procesos de innovación en la ganadería cubana, que fueron potenciados a inicios de la primera década del actual milenio cuando se dio un giro en el sistema convencional de transferencia tecnológica para fomentar la innovación y el desarrollo local rural. Ejemplos destacados de la aplicación de este enfoque son: el Programa de Desarrollo Agropecuario en el municipio Martí, el fortalecimiento de los procesos de innovación agropecuaria local y de fomento de sistemas locales de innovación en el sector cooperativo y campesino de la provincia de Matanzas, así como la producción integrada de alimentos y energía sobre bases agroecológicas en cinco provincias cubanas. The changes occurred in Cuban agriculture at the end of the 20th century caused the rupture of the paradigm based on import dependence, for which it became necessary to begin building a new technical-economic model based on endogenous development, associated to the promotion of innovative capacities and sustainable technologies; this demanded that knowledge-development centers focused on the application of innovations, through adequate rural extension processes. In this sense, the Experimental Station "Indio Hatuey" focused the efforts on the promotion of innovation processes in Cuban livestock production, which were enhanced at the beginning of the first decade of this millennium, when a turn occurred in the conventional technology transference system to promote innovation and rural local development. Outstanding examples of the application of this approach are: the Livestock Production Development Program in the Martí municipality, the enhancement of the processes of local agricultural innovation and of promotion of local innovation systems in the cooperative and farmer sector of Matanzas province, as well as the integrated food and energy production on agroecological bases in five Cuban provinces.
La Innovación y la transferencia de tecnologías en la Estación Experimental "Indio Hatuey": 50 a os propiciando el desarrollo del sector rural cubano (Parte I) Innovation and technology transference at the Experimental Station "Indio Hatuey": 50 years propitiating development in the Cuban rural sector (Part I)
Taymer Miranda,Hilda Machado,J Suárez,Tania Sánchez
Pastos y Forrajes , 2011,
Abstract: Con el triunfo de la Revolución cubana, el Ministerio de la Agricultura creó un sistema centralizado de gestión e innovación tecnológica, que generó cambios sustanciales en las condiciones de vida y trabajo del campesinado. Sin embargo, este impulso tuvo limitaciones de tipo estructural que provocaron consecuencias económicas y ambientales desfavorables, las que determinaron la necesidad de un cambio tecnológico en la agricultura cubana de los a os 90. Esta problemática obligó a los centros de desarrollo de conocimiento a buscar nuevas vías para la aplicación efectiva de las innovaciones, asunto que fue prioridad de la EEPF "Indio Hatuey" desde su fundación. El mayor impacto que generó la Estación, en términos de generalización de resultados, estuvo asociado a las oportunidades originadas por el MINAGRI con la creación de un sistema de extensión agrícola en el quinquenio 1976-1980. Los resultados científicos se centraron en la conservación de forrajes, como estrategia para aliviar el déficit alimentario que se producía cada a o, durante la estación seca. Con la crisis económica de los 90 del siglo XX comenzó un proceso de reconversión de las tecnologías de explotación del ganado lechero. A mediados de los 90 surgió la tecnología del silvopastoreo, que fue introducida de forma gradual en 16 provincias del país, con la asesoría de un grupo multidisciplinario encargado del monitoreo y la retroalimentación entre el centro de investigación generador y los receptores. Sin embargo, para garantizar la sostenibilidad de la diseminación de estos sistemas un factor limitante lo constituía la disponibilidad de semillas de pastos. A pesar de lo novedoso de las tecnologías generadas por la Institución, el grado de adopción no se correspondía con las necesidades reales y el esfuerzo que hacía Cuba para revertir la situación de la ganadería. La Institución buscó una nueva forma de enfocar la transferencia de tecnología, al visualizarla como un componente del desarrollo territorial rural que ha determinado la apropiación de nuevos conceptos y construcciones sociales. Se realizaron investigaciones en seis municipios de la provincia de Matanzas, con resultados relevantes para las localidades. With the triumph of the Cuban Revolution, the Ministry of Agriculture (MINAGRI) created a centralized management and technological innovation system, which generated substantial changes in the farmers' living and working conditions. However, this enhancement had structural limitations that caused unfavorable economic and environmental consequences, which determined the need for a tech
El movimiento social altermundista. La nueva praxis de la acción política
Tania L. Sánchez Garrido
El Cotidiano , 2004,
Abstract: En el incierto, contingente y riesgoso contexto de la globalización, resulta interesante analizar el formato organizativo que exhibe el movimiento altermundista, original forma de acción colectiva que, desde sus particulares formas de organización y de lucha, rompe con el aislamiento que propiciaba la vieja dinámica de los movimientos sociales: avanzar por vías separadas. Vale preguntarse entonces: qué es lo que propicia el internacionalismo de la acción? cómo se articulan, ciertas reacciones, movilizaciones y demandas locales-globales en pro de la formación de las llamadas redes de economía solidaria? y, en tal sentido, cómo converge?
México y el altermundismo: avances y retrocesos
Tania L. Sánchez Garrido
El Cotidiano , 2005,
Abstract: La Globalización es un fenómeno que penetra toda esfera humana redefiniendo la dinámica de las sociedades contemporáneas, pues ha dado lugar a un proceso de interconexión acelerada de ámbitos disímbolos. Ahora bien, lo que resulta interesante es que está arrojando un tipo particular de organización política, como lo demuestra el surgimiento del movimiento social altermundista1 y es a partir del cual nos preguntamos en qué radica lo novedoso y por qué en sociedades como la nuestra el eco que registra la subpolítica es tan pobre.
Solvent Extraction of Citric Acid with Different Organic Phases  [PDF]
Estêv?o Magno Rodrigues Araújo, Fabrício Eduardo Bortot Coelho, Julio Cézar Balarini, Tania Lúcia Santos Miranda, Adriane Salum
Advances in Chemical Engineering and Science (ACES) , 2017, DOI: 10.4236/aces.2017.73023
Abstract: The present work aimed at the study of citric acid solvent extraction in order to establish the composition of the organic phase and to obtain thermodynamic and kinetic data for the chosen system. Discontinuous extraction experiments in a single stage were performed from a synthetic solution of citric acid, with the typical concentration (10% w/v) observed in industrial fermented musts. Exploratory experiments were carried out using different organic phases in order to select the most suitable solvent phase to further continuous extraction tests in a mechanically agitated column. The selected organic phase composition was: Alamine 336, ExxalTM 13 tridecyl alcohol, and the aliphatic diluent EscaidTM 110. Next, the effects of the contact time and of the concentrations of extractant and modifier on the citric acid extraction were studied. Among the investigated conditions, the best one was 10 minutes of contact time, 30% w/v of Alamine 336, and 10% w/v of ExxalTM 13 tridecyl alcohol. For this condition, the equilibrium isotherm (28°C ± 2°C) was determined, and the equilibrium constant was calculated (36.8 (mol·L-1)-1.5). It was considered that trioctylamine and citric acid complexation reaction occurs mainly with non-dissociated citric acid form, because the aqueous feed solutions’ pH is lower than the citric acid pKa1. It was found that 1.5 molecules of the extractant, on average, are required to react with one citric acid molecule, which can indicate that reactions with different extractant/citric acid ratios occur simultaneously. Next, the rate constants for the direct and inverse reactions, 2.10 (mol·L-1)-1.5·s-1 and 5.69 × 10-2 s-1, respectively, were calculated. Coefficients of determination (R2) values higher than 0.93 were found in these calculations, suggesting that the results obtained using a computer modeling would be very close to those results obtained experimentally. Therefore, the present work provides data required to future modelling, design, and simulation of citric acid solvent extraction processes.
O cotidiano das famílias de crian?as e adolescentes portadores de anemia falciforme
Guimar?es, Tania M. R.;Miranda, Wagner L.;Tavares, Márcia M. F.;
Revista Brasileira de Hematologia e Hemoterapia , 2009, DOI: 10.1590/S1516-84842009005000002
Abstract: sickle cell anemic is a common disorder among hemoglobinopatias, characterized by a genetic mutation which affects the function of the red blood cells, causing episodes of vaso-occlusion and predisposing sufferers to infections. this study aims at describing the day-to-day life of families with children and adolescents with sickle cell anemia. this was a descriptive, exploratory, qualitative investigation. data collection was achieved by recording semi-structured interviews with relatives of ten under 18-year-old patients with sickle cell anemia attended in the hemope clinic in october 2006. the selection criteria of interviewees were that they lived with and were first degree relatives of the patient. the exclusion criterion was that the patient was at risk of death. the sample size followed the criteria of saturation discussed by mynaio. the technique of "analysis of content" described by bardin was used in the evaluation. the interviews were completely transcribed and grouped according to their similarities, searching for relevant feelings originating from codes and themes: 1. theme: involvement of the family (exclusiveness of attention; codes: overprotection, relinquishing other roles, overload of mother, learning with the illness); 2: theme: impact of the illness (chronic illness affecting family; codes: non-acceptance, fear of death); 3. theme: facing challenges (support networks, healthcare services; codes: spiritual, professional, and family support; hospital structure). we verified difficulties in the acceptance of the illness by the family and the burden of the mother with necessary patient care. in conclusion, healthcare assistance models should allow the family to act as a co-participant in the care of the patient in order to facilitate the patient's adaptation to the disease.
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