1,721,073 research outputs found
Solid Oxide Fuel Cells: Numerical and Experimental Approaches
No full textSolid oxide fuel cell (SOFC) is a promising electrochemical technology that can produce electrical and thermal power with outstanding efficiencies. A systematic synergetic approach between experimental measurements and modelling theory has proved to be instrumental to evaluate performance and correct behaviour of a chemical process, like the ones occurring in SOFC. For this purpose, starting from SIMFC (SIMulation of Fuel Cells) code set-up by PERT-UNIGE (Process Engineering Research Group) for Molten Carbonate Fuel Cells [1], a new code has been set-up for SOFCs based on local mass, energy, charge and momentum balances. This code takes into account the proper reactions occurring in the SOFC as well as new geometries and kinetics thanks to experiments carried out on single cells and stack in ENEA laboratories of C.R. Casaccia and VTT Fuel Cell Lab in Finland. In particular using an innovative experimental setup it has been possible to study experimentally the influence of a multicomponent mixtures on the performance of SOFC and also validate locally a 2-D model developed starting from SIMFC code. The results obtained are good, showing a good agreement between experimental and numerical results. The obtained results are encouraging further studies which allow the model validation on a greater quantity of data and under a wider range of operating conditions
Análisis productivo y económico de una alternativa de dieta en un rodeo lechero en Arroyo Cabral, Córdoba
Full text linkTrabajo Final (Especialización en Alimentación de Bovinos) -- UNC- Facultad de Ciencias Agropecuarias, 2025Fil: Conti, Bruno. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Salloum, María Soraya. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.El presente trabajo de investigación se centra en el análisis productivo y económico de una alternativa de dieta en un rodeo lechero.
Dicha investigación se realizó en el establecimiento “Javier Chena”, ubicado en la zona de Arroyo Cabral, departamento General San Martín, provincia de Córdoba, entre las localidades de La Palestina y Arroyo Cabral sobre la ruta S 385. Se trata de una región agrícola-ganadera, en la cual predominan los cultivos de soja, maíz y maní. La misma es muy requerida para la siembra por ser fructífera para la cosecha siendo los alquileres en esta zona muy elevados. El establecimiento cuenta con una superficie de 62 has propias, a las que se le sumaron recientemente 40 hectáreas arrendadas, lo que exige una gestión intensiva y eficiente Gracias al esfuerzo y dedicación de muchos años, actualmente se encuentran instalados 3 robots de ordeño reconocidos de una marca importante de nivel internacional.
Además, cabe destacar que el establecimiento se encuentra en una de las principales cuencas lecheras del país, que también coincide con la zona más importante de producción de maní, lo cual representa un desafío adicional en la gestión del uso de la tierra frente a los arrendadores de dicho cultivo. En cuanto a los resultados, la implementación de la dieta alternativa no modificó el costo de producción de la leche, que se mantuvo en 0,38 USD/litro, y tampoco generó desequilibrios en los balances nutricionales. En términos económicos, el margen bruto fue similar entre ambas dietas, con un leve incremento favorable en la opción 2, lo que sugiere que la alternativa evaluada constituye una estrategia basada en la optimización del sistema, más que en un cambio radical en la formulación.Fil: Conti, Bruno. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina.Fil: Salloum, María Soraya. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina
The yellow pages of SOFC technology. International Status of SOFC deployment 2017
Full text linkLe celle a combustibile ad ossidi solidi (SOFC) sono una tecnologia di frontiera per convertire l’energia chimica di idrocarburi fossili o rinnovabili in elettricità e calore, attraverso una reazione elettrochimica. Decenni di ricerca e sviluppo stanno dando i loro frutti, e sono già numerose le applicazioni per la generazione di potenza elettrica pulita ed affidabile presso consumatori in tutto il mondo. Le SOFC possono utilizzare gas naturale, biogas e combustibili liquidi per la generazione di potenza elettrica e calore a efficienze record (fino al 60% netto di efficienza elettrica di sistema) anche a piccola scala e a carico parziale. Il potenziale di questa tecnologia è enorme e imprese dinamiche emergono in tutto il mondo, che trasformano le SOFC in prodotto, portandole a mercati diversi e variegati: potenza portatile, micro-cogenerazione, cogenerazione a scala commerciale, generatori di potenza ausiliare. In questo Dossier, viene riportata una panoramica concisa ma completa della diffusione a livello industriale della tecnologia e delle applicazioni SOFC nel mondo. Tutti gli sviluppatori principali delle SOFC vengono profilati: vengono descritti la loro tecnologia specifica, i loro prodotti e i loro mercati – a dimostrazione che la generazione di energia pulita, silenziosa ed affidabile sta diventando una realtà commerciale
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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