1,720,988 research outputs found
La dimensione storica delle idrofite invasive: un database condiviso, potenzialità e studi fatti
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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
Areas with Natural Constraints to Agriculture: Possibilities and Limitations for The Cultivation of Switchgrass (Panicum Virgatum L.) and Giant Reed (Arundo Donax L.) in Europe
No full textThe European Union is facing complex issues concerning the achievement of GHG reduction goals. CO2 emissions could be reduced by a rational allocation of perennial lignocellulosic crops on unsuitable land for agriculture. These crops would also potentially reverse the increasing trend of soil depletion and land abandonment in Europe. The Joint Research Centre (JRC) identified biophysical constraints aimed at defining and unifying the definition of marginal land across Europe, and evaluating agricultural opportunities in these areas. In this study we evaluate possibilities and limitations for the cultivation of two of the most promising perennial biofuel crops (giant reed and switchgrass) in Europe, in areas with natural constraints (ANC land), as identified by the JRC. Based on the literature, both giant reed and switchgrass appear suitable for ANC land. Only shallow rooting depth and waterlogging can limit the establishment and agricultural mechanization of these rhizomatous plant species. Field tests in ANC land are needed to assess the potential yields provided by lignocellulosic crops under such limiting conditions. These results are fundamental to stimulate farmers’ acreage expansion and the development of a supply chain. Further research in the impact of lignocellulosic crops on the evolution of ANC ecosystems and lignocellulosic species is also needed to ensure a sustainable use of ANC land
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
Ecosistemi da progettare. Esercizi progettuali per la conservazione della biodiversità, il ripristino funzionale degli ecosistemi e l’accessibilità alle risorse naturali.
Full text linkIn un’epoca di grande pressione sugli ecosistemi naturali, l’uso del territorio per la conservazione della biodiversità, il recupero funzionale degli ecosistemi più degradati e di sistemi produttivi che si coniughino alle esigenze di biodiversità, hanno un ruolo strategico di primaria importanza per assicurare la sostenibilità delle risorse.
La biodiversità è tutto ciò che abbiamo. Biodiversità è ossigeno, cibo, medicine, risorse economiche, resilienza e adattamento ai cambiamenti naturali, così come a quelli indotti dalle attività umane. Un mondo senza uccelli, insetti, prati, aree umide o boschi non sosterebbe la popolazione umana esistente, e certamente non renderebbe possibile la ripresa economica che tutti ci auspichiamo.
Abbiamo chiesto agli studenti del corso di “Ecosistemi, habitat protetti e ripristini ambientali” della Laurea Magistrale in “Progettazione e gestione degli ecosistemi agro-territoriali, forestali e del paesaggio” dell’Alma Mater Studiorum, Università degli Studi di Bologna, di fare un esercizio teorico-pratico sulla base di questa prospettiva e cioè di elaborare progetti di ripristino ambientale, conservazione della natura, e uso sostenibile delle risorse. Gli studenti hanno risposto con grande serietà ed entusiasmo a questa proposta formativa. Sono loro gli ideatori, interlocutori e anche i beneficiari dei progetti che vengono presentati in questo booklet. In alcuni casi hanno ritenuto opportuno coinvolgere la cittadinanza e le associazioni di volontariato locali per poter sviluppare i loro progetti sulla base delle esigenze dei fruitori di queste aree. Queste sono vere e proprie azioni di Citizen Science che integrano l’uso sostenibile dell’ambiente con le esigenze economiche e della società, e forniscono una prova della professionalità acquisita dai ragazzi in questo percorso.
Nell’elaborazione dei progetti i ragazzi sono stati affiancati e stimolati da esperti e professionisti di vari settori che hanno permesso di indirizzare l’esercizio teorico necessario per il sostenimento dell’esame alle esigenze specifiche e attuali dei territori studiati.
Con questo booklet desideriamo far conoscere agli addetti ai lavori, enti di gestione, aree protette, comuni, regioni, ai proprietari delle aree scelte come modello per l’esercizio progettuale e alla cittadinanza, i progetti sviluppati nei loro territori. Possono servire come spunto per la pianificazione e la gestione dei territori specifici, ma esprimono anche la necessità dei nostri ragazzi di un ambiente fatto di natura e biodiversità
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