1,720,995 research outputs found
Innovazione di processo industriale per la depurazione delle acque
No full textLa gestione dei reflui civili prevede diverse fasi di trattamento le quali hanno lo scopo di rendere di nuovo utilizzabili le acque gestite ed i materiali (organici ed inerti) presenti nelle stesse.
L’approccio ed i costi di gestione sono fortemente dipendenti dalle dimensioni degli impianti ed agli obiettivi che si vogliono perseguire. I processi preliminari da effettuarsi sulle acque reflue tal quali sono però comuni a tutte le tipologie di impianto e prevedono: grigliatura o vagliatura per l’eliminazione dei materiali grossolani, dissabbiatura per
l’estrazione dal flusso di inerti di origine sabbiosa ed in genere dei materiali pesanti ed in fine la sgrassatura per la rimozione dei grassi flottanti sul pelo libero dell’acqua. I liquami così trattati potranno,
quindi, essere inviati ai trattamenti secondari.
L’ottimizzazione di tali processi richiede studi particolareggiati di tutte le differenti fasi. L’ottimizzazione delle superfici filtranti dei vagli, il dimensionamento delle vasche, l’estrazione del materiale (sia
flottante che sedimentato), l’effetto dell’areazione della vasca, oltre ovviamente all’analisi della resistenza strutturale del sistema. In particolare per ciò che concerne il dimensionamento e la forma del
bacino di sedimentazione risulta particolarmente importante analizzare sia le caratteristiche fisiche del materiale che si vuole estrarre (dimensioni,
densità degli inerti, ecc.), sia le proprietà del flusso del liquido (velocità, direzione, portata, ecc.). Per il raggiungimento di questi importanti obiettivi, la presente ricerca propone alcuni sperimentali risultati
relativi a processi meccanici combinati in grado di svolgere le singole fasi di trattamento, valutando il contenimento delle dimensioni degli impianti ed i relativi costi di realizzazione e di gestione. A tal proposito il contributo propone in un primo momento un inquadramento tecnico del processo di trattamento (primario e secondario) e le caratteristiche dell’impianto ed in un secondo momento la valutazione della sostenibilità economica ed ambientale del recupero della frazione organica da indirizzare alla trasformazione energetica
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
Iron-rich saponite: dissolution reactions and Cr uptake
No full textTo gain a deeper understanding of the geochemical processes involved in the interactions between ionic solutions and clay minerals in natural systems, the dissolution rate of an Fe-rich saponite from Mt. Prinzera (Taro Valley, Italy) was measured as a function of pH and time at 25 degrees C. Also, its ability to adsorb Cr was studied at varying metal concentrations (3.22, 5.50, 8.50 mEq l(-1)) and with different competing anions (CH3COO-, Cl-, NO3-). It was found that there is a correlation between the experimentally determined release rate constant (k), as defined by the relase of Si, and pH. In acidic solutions, the k values correlate negatively with pH, whereas the opposite occurs for basic solutions. The extent of Cr uptake was measured by analysis of the liquid portion separated by centrifugation after a controlled period of exposure. The Cr adsorbed for different concentrations and anionic environments shows the dependence of Cr uptake on the initial metal concentration and on accompanying anions in the order CH3COO- < Cl- < NO3-
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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