1,720,954 research outputs found
Il problema dei nitrati nel comprensorio del lago di Massaciuccoli: l'analisi degli stakeholders
No full textL’analisi critica dei sistemi colturali monitorati nel comprensorio del lago di
Massaciuccoli ha evidenziato come questi non sempre rispondano alle severe
esigenze di tutela ambientale che la salvaguardia della risorsa idrica impone
all’interno di un comprensorio tanto vulnerabile.
Al di là dei piccoli “aggiustamenti” che potrebbero essere apportati sin da subito
a carico di alcuni segmenti della tecnica colturale, è però difficile proporre
un modello “preconfezionato” di agricoltura compatibile, che possa essere trasferito
direttamente all’interno del comprensorio in esame. Ogni modifica deve
invece essere introdotta con prudenza, valutando ogni possibile conseguenza
anche sul piano dell’organizzazione aziendale, oltre che su quello della congruenza
agronomica.
La gestione del cambiamento risulta, quindi, oltremodo difficoltosa se le soluzioni
proposte non risultano adeguatamente condivise e partecipate dagli
agricoltori, cioè da coloro che sono poi chiamati a tradurle in effettivi comportamenti
tecnici
Il problema dei nitrati all'interno del bacino del lago di Massaciuccoli
No full textIn considerazione delle specificità ambientali, biologiche e naturalistiche che caratterizzano il comprensorio lacuo-palustre del Massaciuccoli, la Regione Toscana ha deciso con delibera n. 172 dell’8 ottobre 2003 di attribuire al comprensorio idraulicamente tributario del lago la qualifica di “area vulnerabile” da nitrati (ai sensi del DL 152/99).
Buona parte di questo territorio (6.820 ha su 14.323) è sotto la giurisdizione del Parco naturale regionale di Migliarino, San Rossore, Massaciuccoli che, a partire dai primi anni ’90, ha promosso e coordinato numerose ricerche finalizzate a valutare il possibile contributo dell’agricoltura all’arricchimento in nutrienti.
Il Dipartimento di Agronomia e Gestione dell’Agroecosistema dell’Università di Pisa si è posto quindi l’obiettivo di chiarire i reali termini del problema e di suggerire, di concerto con gli agricoltori, gli eventuali correttivi da apportare, contribuendo alla definizione di linee programmatiche utili alla stesura di Codici di Buona Pratica Agricola Locali (CBPAL).
L’attività svolta nel corso del progetto è sostanzialmente riconducibile a tre direttrici principali:
- caratterizzazione e valutazione dei modelli agricoli presenti nell’area di studio;
- monitoraggio ambientale del sistema delle acque superficiali;
- applicazione di un modello matematico di simulazione, tarato sulla base di dati raccolti nel comprensorio, per quantificare lo specifico contributo attribuibile all’esercizio dell’attività agricola
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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