1,720,970 research outputs found
I paesaggi agricoli periurbani nelle politiche alimentari locali: proposta per una strategia sistemica
No full textIl lavoro si compone in tre sezioni: Teorie, Prassi e Azioni. Esse, oltre ad organizzare il lavoro secondo un percorso logico e metodologico, riflettono una fisiologica tripartizione del percorso di dottorato dovuta alla durata dello stesso, cioè il triennio. A partire da un’analisi teorica del problema individuato, il lavoro presenta una sezione mirata ad osservarne la fenomenologia, per terminare con una proposta strategica elaborata sulla scorta delle prime due sezioni. Tale suddivisione, che risente comunque di interferenze incrociate e necessari rimandi tra le tre sezioni, è rappresentativa e si fa metafora del percorso di dottorato stesso. Se durante il primo anno gli sforzi sono concentrati ad identificare il campo di ricerca e individuare il problema al quale si vuole rispondere, il secondo si appoggia su tali acquisizioni per analizzare e studiare le pratiche esistenti, per poi avere gli strumenti per formulare un proprio pensiero indipendente ma saldamente costruito su un percorso di studio e di ricerca. Teorie: La sezione specifica il problema di ricerca, l’ambito di lavoro e i principali approcci teorici già esistenti sul tema della sostenibilità dei sistemi alimentari e degli impatti degli stessi su paesaggio e ambiente, partendo dalla constatazione dell’importanza che i sistemi alimentari – nella loro natura di combinazioni complesse di flussi, spazi, valori, attività e rappresentazioni – hanno nel produrre paesaggio, sia in termini materiali che simbolici. Un’attenzione particolare viene dedicata all’agricoltura periurbana e al suo ruolo all’interno delle connessioni urbano-rurali e delle politiche locali del cibo. Prassi: La sezione analizza il caso francese, che si caratterizza per uno spiccato approccio territoriale alla soluzione dei problemi legati ai sistemi alimentari localizzati. In particolare, viene presentata la metodologia attraverso la quale è stato diffuso un questionario a circa 300 esperti francesi, riguardante le politiche alimentari urbane di 8 città. Nella sezione vengono presentati e discussi i risultati del questionario, al fine di delineare punti di forza e criticità di un approccio territoriale al cibo. Azioni: La terza sezione è di carattere propositivo-sperimentale. Si appoggia ai risultati e alle evidenze scaturite dalle prime due sezioni – impianto teorico per la sezione “Teorie” e analisi del fenomeno per la sezione “Prassi” – al fine di presentare una proposta per una politica del cibo e del paesaggio per la città di Roma Metropolitana. La proposta è il frutto di un lavoro di ricerca portato avanti anche grazie al supporto di un nutrito gruppo di stakeholder attualmente ingaggiati nel definire le priorità legate alla sostenibilità del sistema alimentare della Capitale
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
Production of bacteriocin-like substances by human oral streptococci.
No full textA sample of human streptococci (mainly Streptococcus mutans species) from dental plaques was examined in order to evaluate the production frequency and activity spectrum of bacteriocin-like substances (mutacins). 89% of the 55 Streptococcus mutans strains produced substances with a wide spectrum of antibacterial activity. The bacteriocins produced showed a marked inhibitory activity against Gram-positive bacteria. Among the Gram-negative species tested, only Neisseria sicca was inhibited by 25% of Streptococcus mutans strains. Also, 16 strains belonging to oral streptococci other than Streptococcus mutans, were examined for their inhibitory capacity against the same indicator. The authors stress the importance of mutacins production in oral ecology and Streptococcus mutans pathogenicity
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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