1,720,961 research outputs found
Energy solutions for sports facilities
No full textThe sports facilities are characterized by special energy needs different from any other user and they are characterized by high heat and electricity loads. For this reason, the aim of this work has been to propose a tool to provide a preliminary estimation of the power and energy required by the sports centres. In addition, the possibility to make the building self-energy sufficient has been considered, thanks to the exploitation of renewable energy sources (RES). The overall work has been performed following three steps: energy needs analysis; local RES availability analysis; energy balance of Sport Centres. Considering that each sport facility is characterized by different energy needs depending on the sport typology itself, the analysis started from the features established by the CONI (National Italian Olympic Committee) standardization. For calculations a program in LabVIEW has been developed to evaluate the energy requirements of the sports centre considering as inputs the sport halls, the playgrounds and the supporting rooms, the level of the sport activity (e.g. agonistic) and the climatic conditions of the area where the facilities are located. The locally available RES are evaluated in order to decide which one can be exploited to feed the Sport Centre. The proposed solution for the energy production refers to a combination of different and innovative technologies which involve, in particular, hydrogen technologies. The energy and costs analysis has been finally carried out for an application case in Dubai. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved
Techno-economic optimisation of hydrogen production by PV – electrolysis: “RenHydrogen” simulation program
No full textSimulazione ed analisi di un sistema di produzione di idrogeno via elettrolisi alimentato da un impianto ibrido fotovoltaico - eolico
No full textSessione Tecnica Tema n. 06 – La produzione e l’utilizzazione dell’idrogeno a fini energetic
Energetic evaluation on auxiliary systems of an hydrogen hybrid minibus
No full textThe transport is currently shifting towards an electric hybridization of the powertrain and the primary target is to decrease the pollutant emissions, to enhance efficiency and contemporary maintain the current vehicle performances. In particular the range is crucial for the electric powertrain and it could be sensitively affected by the auxiliary systems consumption. In fact it represents a considerable load and its consumption could reach 34% of total energy in a vehicle as verified in this work. The carried out activity has dealt with the energy analysis of the bus in different cases study varying the number of passengers, to evaluate the real range of the vehicle in real conditions. After that, the analysis has delved to the auxiliary system of mini-buses consisting of APU (Auxiliary Power Unit), suspension air compressor, cooling fans, water pump, windscreen wiper, doors motion, lights, defrosting device, electronic management system, power steering, power braking system. Once set up different representative working parameters, the data has been acquired during real tests performed to evaluate the energy required by each device. They have been exploited to simulate the auxiliary energy incidence on the actual range of the bus in real use. The auxiliary system incidences have been evaluated on the global efficiency of the minibus monitoring the energy use of auxiliary components by developing an efficient data acquisition system. The conclusion is that the energy required by the auxiliaries is not negligible, so that the efficiency enhancement of the auxiliaries could lead through an improvement of the global energy use in the vehicle, which is particularly important for innovative means of transport which are characterized by a limited range, as the electric and the hydrogen vehicle
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
- …
