1,720,977 research outputs found
Novel techniques of imaging interferometry analysis to study gas and plasma density for laser-plasma experiments
Get PDFLaser-plasma based experiments are always more demanding about the plasma features which need to be generated during the interaction. This is valid for laser-plasma acceleration as well as for inertial confinement fusion experiments. Most of these experiments are moving toward high repetition rate operation regimes, making even more demanding the requests on the plasma sources and the diagnostics to be implemented. Interferometry is one of the most used methods to characterize these sources, since it allows for non-perturbative, single-shot measurements either of the neutral gas or the plasma density. The design of the interferometric setup is non-trivial and needs to be shaped on the actual conditions of the experiment. Similarly, the analysis of the raw data is a complex task, prone to many sources of error and dependent on the manual inputs. In this work, we will present the techniques we are developing for the analysis of the interferograms to measure both the gas and plasma density. We will show the methods, the progress and the problems we encountered in the development of novel routines of analysis based on machine learning. The architectures and the methods to obtain data used for training and testing them will be introduced. The study is ongoing and preliminary results with synthetic data will be presented. The goal is to set up a fast and operator independent diagnostic for the feedback of plasma sources toward high repetition rate experiments
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Questio satis iocunda est : Analisi delle fonti di questiones et responsiones del Liber de natura rerum di Tommaso di Cantimpré*
Get PDFBien que tous les encyclopédistes du XIIIe siècle utilisent un corpus commun de sources, chacun d’eux a une manière personnelle de choisir, « découper » et disposer les contenus tirés de ces auctoritates. Ces modi scribendi attentifs et distinctifs ne permettent pas seulement à un compilateur, qui recueille les prestigieux matériaux d’autrui, de devenir auteur, ce qui est prestigieux en soi, mais reflètent également les différentes formae mentis et les objectifs fondamentaux d’une encyclopédie médiévale. Grâce à l’analyse de la manière dont le Dominicain flamand Thomas de Cantimpré (1201-1270/1271) copie certains traités de questiones et responsiones – par exemple les Questiones naturales d’Adélard de Bath et les questiones salernitane anonymes – dans ses rédactions successives du Liber de natura rerum (1242/1247-1255/1260), cet article vise donc à montrer comment Thomas utilise ces sources particulières pour arriver à ses fins marquées par un esprit à la fois pragmatique et dominicain.Even though encyclopedists of the thirteenth century used a common corpus of sources, each had a precise and personal way to choose, ‘tailorize’ and arrange the contents taken from these auctoritates. The peculiar and custom modi scribendi permitted the compiler (who collects authoritative materials from others) to become an author (who in turn becomes authoritative), while also reflecting accurately the different forme mentis and purposes behind the encyclopedic texts. Through the analysis of the exclusive way in which the Flemish Dominican friar Thomas of Cantimpré (1201-1270/1271) copies dialogical treatises – such as Adelard of Bath’ Questiones naturales and the anonymous questiones salernitane – in both authorial versions of his encyclopedia, Liber the natura rerum (approximately 1242/1247-1255/1260), this essay shows how Thomas uses these particular sources to reach his own pragmatic and dominican goals
Un aspect de l’encyclopédisme de Thomas de Cantimpré. La section De lapidibus pretiosis du Liber de natura rerum
Get PDFBien que tous les encyclopédistes du xiiie siècle utilisent un corpus commun de sources, chacun d’eux a une manière personnelle de choisir, « découper » et disposer les contenus tirés de ces auctoritates. Ces modi scribendi attentifs et distinctifs ne reflètent pas seulement les différentes formae mentis et finalités à la base d’une encyclopédie médiévale, mais permettent également à un compilateur (qui recueille les prestigieux matériaux d’autrui) de devenir auteur (qui est prestigieux en soi). Grâce à l’analyse de la structure, des sources et des contenus du De lapidibus pretiosis – le quatorzième livre du Liber de natura rerum, une célèbre encyclopédie écrite entre 1242/1247 et 1260 par le Dominicain flamand Thomas de Cantimpré (1201-1270/1271) –, cet article veut mettre en lumière le « style encyclopédique » exclusif et attentif et les buts précis de son auteur.Even though all thirteenth century encyclopaedists used a common corpus of sources, each of them had a precise and personal way to choose, “tailorize” and arrange the contents taken from these auctoritates. These peculiar and custom modi scribendi reflect accurately the different formae mentis and purposes behind the encyclopaedic texts, while also permitting the compiler (who collects authoritative materials of others) to become an author (who in turn becomes authoritative). Through the analysis of the structure, contents and sources of De lapidibus pretiosis—the fourteenth book of the widespread encyclopedia Liber the natura rerum (approximately 1242/1247-1260)—, this essay will show the exclusive « encyclopaedic style » and goals of its author, the Flemish Dominican friar Thomas of Cantimpré (1201-1270/1271)
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