1,721,559 research outputs found
Microgrids
Full text linkIntegration of renewable energy sources in the electrical power system is key for enabling the decarbonization of that system. The connection of renewable generation to the electrical system is being performed in a centralized form (large renewable power plants like wind or solar power plants connected at the transmission system) and in a decentralized manner (through the connection of dispersed generation connected at the distribution system). The connection of renewable generation at distribution levels, together with other generating sources as well as energy storage systems (the so-called DER, Distributed Energy Resources) close to consumption sites, is promoting the development of microgrids: DER installations that have the capability to operate grid connected and grid isolated. The uncertainty and variability of the renewable energy sources that integrate microgrids, as well as the need for coordination with other energy sources, pose challenges in the operation, protection, control, and planning of microgrids. The five selected papers published in this Special Issue propose solutions to address these challenges.Peer ReviewedObjectius de Desenvolupament Sostenible::7 - Energia Assequible i No ContaminantObjectius de Desenvolupament Sostenible::7 - Energia Assequible i No Contaminant::7.1 - Per a 2030, garantir l’accés universal a serveis d’energia assequibles, confiables i modernsObjectius de Desenvolupament Sostenible::7 - Energia Assequible i No Contaminant::7.2 - Per a 2030, augmentar substancialment el percentatge d’energia renovable en el conjunt de fonts d’energiaPostprint (published version
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Instalación eléctrica nave almacén
No full textEn este proyecto objeto de estudio, se realizo el estudio luminotécnico, el dimensionado de la instalación eléctrica con la aplicación de la normativa vigente para que pase la inspección de los respectivos organismo competente en materia de seguridad industrial.
Este proyecto se estudio el caso de una nave Industrial dedicada al Almacenaje de productos farmacéuticos, en donde tiene diferentes lugares para receptores y maquinaria el cual se ha estudiado.
Para la realización de este proyecto se conto todos los aparatos que ya estaban en situ y se agrego la ventilación, todos estos aparatos fueron ordenados y sumado sus potencias respectivas y multiplicado con el debido coeficiente o factor para obtener la potencia que será utilizada.
Una vez obtenido lo anterior se procede a calcular la intensidad y caídas de tensión reglamentarias y a escoger la sección necesaria para el conductor que llevara la respectiva línea.
También se escogió las respectivas protecciones que viene en el Reglamento electrotécnico de baja tensión el cual se ha utilizado ampliamente para la realización de este proyecto.
En este proyecto la iluminación que se utilizo es de Tecnología LED, ya que da una muy buena iluminación para todas las zonas
Energy efficiency in power transformers
No full textThe objective of this report is to calculate the amount of incentives in orderto achieve the potential energy saving of distribution transformer in distributionnetwork.Firstly, a case study for Spain with the basic data of the power installed ofthree different energy efficiency rates of transformers has been created. Then theproblem formulation in GAMS is presented with the objective function to maximizethe benefit in year n to fulfill with the demand growth, under the control of theeconomic constraint RD222/2008 and the improvement overall efficiency constraint.As a result, the objective of this project can be achieved
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