1,722,862 research outputs found
A predictive maintenance model using Long Short-Term Memory Neural Networks and Bayesian inference
No full textMerits and differences between single-site robotic and laparoscopic cholecystectomy: What is unfair? Commentary on “Propensity score-matching analysis for single-site robotic cholecystectomy versus single-incision laparoscopic cholecystectomy: A retrospective cohort study”
No full textCivil and Industrial Applications of Muography
No full textStarting from the mid-1950s, techniques based on the absorption or scattering of cosmic ray (CR) muons, collectively referred to as muography, have been applied beyond the research domain only. Since the first pioneering measurement of the overburden of a railway tunnel, performed by E.P. George in 1955, applications of muography have steadily grown in number, especially in recent years. In this chapter, an overview of the most important civil and industrial applications of muography is given. Section 2 deals with applications of CR muons for the subsurface exploration, relevant in the mining industry, and for the monitoring of tunnels and other underground civil structures. Section 3 presents the use of muography for the inspection of large and/or inaccessible structures, such as a blast furnace and a nuclear reactor. Section 4 is dedicated to applications to nuclear controls, such as nuclear waste control, the inspection of dry storage casks for spent nuclear fuel, and vehicle and cargo scanning for nuclear contraband. Finally, Section 5 deals with the use of CR muons for the stability monitoring of civil and industrial structures, a technique generally referred to as muon metrology
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
Atomic Wall Recombination and Volume Negative Ion Production
No full textThe development of a numerical code for the modeling of negative ion sources requires the knowledge of a lot of processes occurring both in the gas phase and at the surface. The present work concerns the effect of surface processes (in particular atomic wall recombination) on the kinetics of production/destruction of negative ions. Especially in the pressure regimes useful to produce negative hydrogen ions for thermonuclear applications, wall processes can strongly affect the negative ion production acting on the vibrational distribution of molecular hydrogen
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