1,720,959 research outputs found
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
Investigation of Pore-Scale Phenomena for Underground Gas Storage Through Micromodels
No full textThe global need to reduce carbon emissions and improve energy security is driving the development of innovative energy production and storage strategies. One promising solution for large-scale energy storage is Underground Hydrogen Storage (UHS), which benefits from the long-standing experience in Underground Gas Storage (UGS). However, targeted analyses are essential to assess the limits and potential of this application by properly characterizing the differences in the behavior of hydrogen compared to natural gas in underground saturated porous media. Phenomena at the macro scale are intrinsically linked to behaviors at much smaller scales, highlighting the necessity of detailed experimental investigations. Thus, addressing challenges like storage capacity, injectivity, and safety in underground systems demands a deep comprehension of fluid dynamics at the pore scale. Microfluidic devices are recognized as valuable tools for such a scope. These small-scale systems can mimic porous media networks, enabling direct observation of fluid dynamics and chemical interactions at the pore-scale. Despite limitations, such as their two-dimensional nature, they offer significant advantages over traditional methods, including real-time fluid flow visualization, reusability, and customizable flow patterns. This research focuses on the investigation of pore-scale phenomena through microfluidic devices, with an emphasis on the experimental setup and procedures for fluid flow tests. Early results on gas drainage and water imbibition tests revealed variations in percolation patterns and saturations due to key factors such as fluid type and injection velocity. These findings provide a foundation for advancing our understanding of hydrogen storage in depleted gas reservoirs
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
Linee di flusso per modelli numerici discretizzati con griglie 3D non strutturate: calcolo e visualizzazione sviluppati in ambiente MatLab
Full text linkIn questo lavoro di tesi è stato creato uno strumento informatico sviluppato in ambiente MatLab , per il calcolo e la visualizzazione delle traiettorie/linee di flusso del moto di un fluido in un mezzo poroso a partire da simulazioni numeriche ottenute con griglie non strutturate.
Il codice sviluppato implementa l’algoritmo proposto da Painter, Gable e Kelkar che,
operando in due fasi, prima ricostruisce il campo di velocità del fluido nel dominio indagato e poi
calcola le traiettorie. Tale algoritmo permette di agire su griglie non strutturate, dove nessun vincolo
è posto riguardo alla forma e al numero di facce degli elementi che la compongono.
Il codice prevede che l’utilizzatore fornisca le posizioni iniziali delle particelle di fluido di cui si vuole calcolare le traiettorie e, una volta calcolate, le presenta in forma grafica e le esporta in opportuni file. Il codice crea infatti un file in formato ASCII per ognuna delle traiettorie studiate, in cui è salvata la successione di coordinate costituenti la traiettoria, con relativo tempo di volo e velocità puntuale stimata.
Il codice trova applicabilità in un’ampia varietà di contesti, dalla bonifica di siti inquinati alla coltivazione di reservoir petroliferi o geotermici. In particolare questo strumento potrebbe essere di estremo interesse nello specifico ambito della simulazione di reservoir basata sulle linee di flusso (“streamline-based” nella letteratura anglosassone)
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
- …
