1,720,961 research outputs found
Teleriscaldamento nelle località montane: un caso di studio nel Primiero.
No full textIl continuo aumento dei costi energetici e il crescente interesse per le energie rinnovabili stanno favorendo l'utilizzazione delle biomasse come fonte energetica. Benchè tale approccio sia vantaggioso dal punto di vista del bilancio di CO2, la produzione di energia mediante combustione (di biomassa legnosa) non è sempre un processo ottimale dal punto di vista dell'impatto ambientale.
Di fatto, la biomassa legnosa è un combustibile solido la cui combustione è affetta da problemi simili a quella del carbone e di altri combustibili di scarto e richiede, quindi, una gestione accurata al fine di minimizzare le emissioni inquinanti. Inoltre, la biomassa legnosa grezza (es. cippato) ha un potere calorifico inferiore (PCI) piuttosto basso se rapportato al volume e quindi il suo trasporto, specialmente da fonti di approvvigionamento distanti, può avere un impatto ambientale non trascurabile, che può vanificare parte dei vantaggi derivanti dall'uso di una fonte rinnovabile. D'altro canto, l'attivazione di una filiera corta ottimizzata (gestione forestale -segherie -, teleriscaldamento a biomassa) può portare notevoli vantaggi non solo dal punto di vista ambientale ma anche, per una comunità montana, dal punto di vista economico e sociale.
In questo lavoro viene presentato come caso di studio la Valle di Primiero (Dolomiti – Trento). Viene valutato dapprima l'attuale fabbisogno energetico, tenendo conto delle varie categorie di usi finali (case, alberghi, edilizia commerciale, etc. ). Tale fabbisogno viene confrontato con l'effettiva disponibilità di biomassa legnosa di scarto proveniente sia da segherie locali che dalle attività di ordinaria gestione forestale. Inoltre vengono considerate le interazioni con gli impianti di teleriscaldamento in funzione nelle località limitrofe. Sulla base di tale analisi si fanno alcune considerazioni sulle opportunità offerte da un impianto di teleriscaldamento che si integri nell'organizzazione di una comunità in modo da ottimizzare i benefici economici e quelli ambientali
District heating in alpine communities areas: a case study in the Primiero valley (North-east Italy).
No full textThe increasing energy cost (driven up by oil and naturale gas price) and the growing interest toward renewable energy sources are fostering the use of wood biomass as an energy source. In thisi work, a case study of the Primiero Valley (Dolomites - Italy) is presented. The current energy request for building heating is assessed, factoring the various kinds of final uses (houses, hotels, coomercial estabilishmenst, etc.). This request is compared against the actual availability of wood wastes both from local industrial operations (sawmills) and from forest management activities. In addition, the interactions (especially on the supply side) with nearby, biomass based, district heating systems already in operation is taken in account.
Based on the aforementioned analysis, an integrated proposal is presented for a district heating system, tightly knit with the organization of the local community in such a way to optimize environmental as well as economics and management aspects
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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