1,720,978 research outputs found
Hydrological study of some rivers in the Umbria Region and small scale hydropower applications
No full textIl presente studio è stato realizzato su alcuni corsi d’acqua
d’ordine minore della Regione Umbria ed ha permesso di individuarne il regime idrologico e di condurre valutazioni sul potenziale sfruttamento degli stessi a fini idroelettrici, nel campo dell’idroelettrico minore. Dall’analisi delle pendenze delle curve di durata dei deflussi (FDC) e dall’indice del deflusso di base (BFI) è emerso che i corsi d’acqua esaminati sono ascrivibili a due tipologie: bacini a regime idrologico costante e bacini a regime idrologico torrentizio. Le informazioni ottenute dallo studio idrologico condotto
e la verifica in alveo dei salti ottenibili mediante traversa hanno permesso di selezionare, tra le tecnologie idrauliche in uso, quella meglio adattabile: la vite idraulica. Il dimensionamento della macchina impiegata ha messo in evidenza, a livello teorico, l’effetto prodotto dai due diversi regimi sulla producibilità idroelettrica. L’analisi dei rendimenti della macchina e delle portate turbinabili, ha mostrato la capacità dell’impianto di sfruttare la quasi totalità della
portata disponibile per i corsi d’acqua con deflussi regolari, con
rendimenti elevati. Nei corsi d’acqua a carattere torrentizio i
rendimenti e le rese sono invece più variabili, fino a valori nulli in certi periodi dell’anno, con una parte non trascurabile delle portate transitanti che non risulta produttiva ai fini idroelettrici. I bacini ricadenti nella prima tipologia risultano quindi sfruttabili senza particolari accorgimenti e in abbinamento a più soluzioni impiantistiche, mentre i secondi necessitano di valutazioni più accurate in fase di progettazione
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
Vibrational signal processing for characterization of fluid flows in pipes
No full textThe main idea of this paper is to assess a simpler and faster procedure leading to the evaluation of the
fluid flow rate through a pipe. Currently, several methods are available and they involve ad-hoc instruments.
All these methods are characterized by high accuracies and dynamic responses, but they are
intended to be inserted within the pipe under investigation, bringing to well-known insertion effects,
compromising the reliability of the measurements performed. The authors illustrate a newer methodology
for the measurement of flow rates by means of the processing of the vibration signals of pipe walls,
inferred by the flow turbulence. Previous studies of the same authors showed a linear dependence
between the amplitude of the most prominent peak of the vibration spectra and the flow rate. In this
work, the authors relate the power content of the processed signals (by introducing the signal Root
Mean Square value) to the flow rate
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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