1,720,979 research outputs found
Effetti MHD sulla convezione mista entro un canale rettangolare in regime periodico stabilizzato
No full textLa presente memoria intende sviluppare l’analisi della convezione mista in un condotto rettangolare verticale in presenza di un
campo magnetico uniforme orizzontale. Lo studio è rivolto al regime periodico stabilizzato indotto da una temperatura uniforme
sulle quattro pareti ma variabile nel tempo con legge sinusoidale. Le equazioni di bilancio locale della quantità di moto e
dell’energia, nonché l’equazione di conservazione della carica elettrica, saranno risolte numericamente al variare del rapporto di
forma del condotto, tramite una decomposizione del campo di temperatura, del campo di velocità e del potenziale elettrico in una
componente media ed una oscillante. La conducibilità elettrica delle pareti sarà considerata trascurabile per i casi presi in esame.
Tale lavoro rappresenta un’estensione di precedenti analisi della convezione mista in regime periodico stabilizzato in assenza di
effetti MHD
A Hydrogel Based on a polyaspartamide: Characterization and Evaluation of In-vivo Biocompatibility and Drug release in the Rat.
No full textAbstract
This paper deals with the characterization of a new microparticulate hydrogel obtained by gamma irradiation of α,β-poly[N-(2-hydroxyethyl)-dl-aspartamide] (PHEA).
When enzymatic digestion of PHEA hydrogel was evaluated using various concentrations of pepsin and α-chymotrypsin no degradation occurred within 24 h. In-vivo studies showed that this new material is biocompatible after oral administration to rats. PHEA hydrogel was also studied as a system for delivery of diflunisal, an anti-inflammatory drug. In-vitro release studies in simulated gastrointestinal juice (pH 1 or 6.8) showed that most of the drug was released at pH 6.8. In-vivo studies indicated that diflunisal-loaded PHEA microparticles significantly improved the gastric tolerance and oral bioavailability of the drug in comparison with free diflunisal.
These results suggest the potential application of PHEA hydrogel as a new delivery system for the oral administration of anti-inflammatory drugs.</jats:p
The hydraulic behaviour of the ITER full-scale divertor cassette. The steady state analyses
No full textEffetti MHD sulla convezione mista entro un condotto circolare in regime periodico stabilizzato
No full textNel presente lavoro si studia la convezione mista in un condotto verticale in presenza di effetti magnetoidrodinamici. Si assume una temperatura di parete variabile nel tempo con legge sinusoidale ed un campo magnetico uniforme in direzione ortogonale al moto
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
Final report on the contract EFDA 682 - Preparation of integration and hydraulic tests of full-scale divertor components.
No full textDispelling 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
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