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La capacidad de absorción para la innovación: estudio de caso en la Generación Distribuida Cubana
Filgueiras Sainz de Rozas,Miriam L.; Castro Fernández,Miguel;
Ingenier?-a Energ??tica , 2012,
Abstract: in this paper are made considerations about the need to form conceptions respect to treatment of innovation as a result of an organizational learning process become continuous integration and re-configuration of embedded knowledge in people, processes, systems and the practices of management, as platform to study the mechanisms through which the absorptive capacity is built and increased. it is proposed a conceptual model to explain the innovation capability at a company and establish its essential components, by identifying a set of variables to construct empirical measures to evaluate such capacity and its impact on the level of organizational performance. the research was developed at the cuban′s distributed generation by fuel oil engines′ plants; these organizations presented insufficiency with strategic attitude to innovation, learning and environment, which limited the assimilation of the acquired technologies on years 2005-2008.
Electric Power Quality and Distributed Generation in Cuba Calidad de la energía y generación distribuida en Cuba
Miguel Castro Fernández,Marielys Francisco Fernández,Raúl Díaz Fuentes,ángel Costa Montiel
Revista Cubana de Ingeniería , 2010, DOI: 10.1234/rci.v1i3.28
Abstract: Diesel engine generator (RM) is one of the most used technologies on distributed generation (DG). The presence of RM, no manner its operation form need an analysis about differents problems: one of them is related with power quality (PQ). First results obained inside one study directed to obtain answers about differents perturbations for the RM presence like shortcircuit and voltage variation on RM termianls and rejected charge are presented in this paper. Entre las tecnologías de mayor difusión que en la actualidad se utilizan dentro de la generación distribuida (GD) están los grupos electrógenos (GE) Los GE en cualquiera de sus formas de explotación, exigen un análisis de los problemas que puedan manifestarse por su presencia; uno de estos problemas está relacionado con la calidad de la energía eléctrica (CEL). El presente trabajo expone los primeros resultados de un estudio que va dirigido a buscar respuestas sobre este tema ante diferentes tipos de perturbaciones que pueden presentarse en la red: Cortocircuito y variación de la tensión en los terminales del GE y la desconexión súbita de la carga (rechazo de carga).
Ajuste de las simulaciones de flujos continuados para el cálculo del Límite de Potencia Eólica
Santos Fuentefria,Ariel; Castro Fernández,Miguel; Martínez García,Antonio;
Ingenier?-a Energ??tica , 2012,
Abstract: the wind power insertion in the power system is an important issue and can create some instability problems in voltage and system frequency due to stochastic origin of wind. know the wind power limit is a very important matter. existing in bibliography a few methods for calculation of wind power limit. the calculation is based in static constrains, dynamic constraints or both. in this paper is developed a method for the calculation of wind power limit using some adjust in the continuation power flow, and having into account the static constrains. the method is complemented with minimal power production criterion. the method is proved in the isla de la juventud electric system. the software used in the simulations was the power system analysis toolbox (psat).
Penetración eólica con diferentes tecnologías de aerogeneradores en presencia de una red débil
Santos Fuentefria,Ariel; Castro Fernández,Miguel; Martínez García,Antonio;
Ingenier?-a Energ??tica , 2012,
Abstract: the insertion of wind energy into electric network may provoke stability problems due to stochastic character of wind. the variation in the wind causes voltage variation in the point of common coupling (pcc). in a weakest system that variation is high. another important factor is wind turbine technology. the use of grid-connected fixed speed wind generator introduces a great consumption of reactive power that can be compensated using different devices as capacitors bank or static var compensator (svc or statcom). in the other hand the variable speed wind turbine have an electronic converter to control the reactive consumption to maintain the pcc voltage more stable. in this paper a comparison between the different types of wind turbines technology is show. it's analyzing the impact in wind power limit for different wind turbine technologies in a weak system.
Nanosílice como carga en la RTV SR usada para cubrir aisladores/ Nanosilica as filler in the Room temperature vulcanized silicone rubber used to coat insulators
Ignat Pérez Almirall,Daniella Cibele Bezerra,Miguel Castro Fernández,Edson Guedes da Costa.
Ingeniería Energética , 2012,
Abstract: En el presente trabajo se realiza un estudio sobre la influencia que tiene agregar como carga nanosílice a la goma de silicona vulcanizada a temperatura ambiente (RTV SR, por sus siglas en inglés) que es empleada para cubrir aisladores de vidrio o de porcelana. Con este objetivo se observó la dispersión de la nanosílice en la RTV SR por medio de microscopía electrónica de barrido (MEV, por sus siglas en inglés), se midió la permitividad de la RTV SR con y sin nanosílice para varias frecuencias y se evaluó la influencia que tiene la nanosílice en la resistencia a la erosión. Además fueron medidas las corrientes de fuga durante ensayos de niebla salina a aisladores de vidrio pintados con estos recubrimientos, analizando también la pérdida de hidrofobicidad que ocurre durante el ensayo y su recuperación una vez finalizado el mismo.The present research work carries out a study on the influence of nanosilica on room temperature vulcanized silicone rubber (RTV SR) used to coat insulators. Considering this objective, the dispersion of nanosilica was observed by means of scanning electron microscopy (MEV), the permittivity of the room temperature vulcanized silicone rubber was measured with and without nanosilica for different frequencies and the influence of nanosilica in erosion resistance. Leakage currents were also measured during salt spray tests to glass insulators covered with these coatings; the loss of hidrophobicity during the test was also measured and its recovery was analyzed the test was finished.
Desarrollo de un sistema de información referencial siguiendo una metodología de dise o de bases de datos
Castro Galán, Elena,Martínez Fernández, Paloma,de Miguel Casta?o, Adoración
Revista Espa?ola de Documentación Científica , 2001,
Abstract: The processing of bibliographical references and appointments in scientific works is a complicated process for those researchers no specialist in Information Science. In this work we present some of the problems with which these researchers are confronted, such as the references organization and structure which are usually hand-made with no automatic support. To solve this problems and to make easy the researchers work, we propose a Referential Information System (RIS) that allows to systematize and to homogenize the management of the bibliographical references by means of the databases technology. This referential information system developed following a database design and taking like reference point the ISO 690 standard, allows the user to process its references and to obtain their citations as well as the overhaul of these last ones in generated documents. La elaboración de referencias bibliográficas y citas en los trabajos de investigación es un proceso complicado para aquellos investigadores no especialistas en el área de la Documentación. En este trabajo se plantean algunos de los problemas con los que se enfrentan estos investigadores, como la organización y estructura de las referencias que, en algunos casos, se realiza de forma artesanal. A fin de resolver estos problemas y facilitar el trabajo a los investigadores, se propone un Sistema de Información Referencial (SIR) que permite sistematizar y homogeneizar la gestión de las referencias bibliográficas mediante la tecnología de las bases de datos. Este sistema de información, que se ha elaborado tomando como punto de referencia la norma ISO 690 y aplicando una metodología de dise o de bases de datos, permite al usuario investigador elaborar sus referencias y obtener las citas correspondientes de forma homogénea y conforme a la norma, así como revisar la concordancia entre las citas que aparecen en el texto de sus trabajos y las referencias que se incluyen en la bibliografía.
Nanosílice como carga en la RTV SR usada para cubrir aisladores
Pérez Almirall,Ignat; Cibele Bezerra,Daniella; Castro Fernández,Miguel; Guedes da Costa,Edson; Dantas Germano,André;
Ingenier?-a Energ??tica , 2012,
Abstract: the present research work carries out a study on the influence of nanosilica on room temperature vulcanized silicone rubber (rtv sr) used to coat insulators. considering this objective, the dispersion of nanosilica was observed by means of scanning electron microscopy (mev), the permittivity of the room temperature vulcanized silicone rubber was measured with and without nanosilica for different frequencies and the influence of nanosilica in erosion resistance. leakage currents were also measured during salt spray tests to glass insulators covered with these coatings; the loss of hidrophobicity during the test was also measured and its recovery was analyzed the test was finished.
EL PAPEL DE LA MUJER EN LOS MICROCRéDITOS DE LOS PAíSES EN VíAS DE DESARROLLO. EL CASO DE MOHAMMAD YUNUS (BANGLADESH)
Manuel Castro Fernández
Nómadas , 2010,
Abstract: Con este trabajo hemos querido centrar y analizar el por qué del importante papel que la mujer desempe a el sistema de préstamos conocido como microcréditos, los motivos y lo que han supuesto para miles de personas como único medio de salir de la miseria. El motivo de elegir el caso de Bangladesh y en especial el Grameen Bank de Mohamed Yunus se debe, no sólo por haber sido la primera experiencia desarrollada en microcréditos, sino por la repercusión que a nivel mundial han tenido sus experiencias.
?Son problemáticos para el veritismo la naturaleza y el valor del entendimiento?
Fernández, Miguel ángel;
Diánoia , 2010,
Abstract: this paper examines a series of recent objections to veritistic epistemology that aim to show that it cannot account for the nature and value of understanding. section 1 formulates the central tenets of veritistic epistemology and makes a few more preliminary remarks. sections 2 and 3 discuss objections that attempt to show that cognitive states implicated in understanding have a sui generis nature which makes the veritistic model of evaluation inapplicable to them. sections 4 and 5 examine objections that aim to show that there are aspects of understanding which are epistemically valuable, whose value cannot be explained in veritistic terms. section 6 sums up results of the discussion: none of the objections discussed succeeds in revealing any explanatory deficit of veritism with respect to the nature and value of understanding.
RESE A DE GOTTLIEB, M. 2006. ASSESSING ENGLISH LANGUAGE LEARNERS: BRIDGES FROM LANGUAGE PROFICIENCY TO ACADEMIC ACHIEVEMENT.
Miguel Fernández álvarez
Revista de Lingüística y Lenguas Aplicadas , 2009, DOI: 10.4995/rlyla.2009.745
Abstract:
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