1,720,981 research outputs found
Electron scale magnetic reconnections in laser produced plasmas
Full text linkKuramitsu Yasuhiro, Sakai Kentaro, Moritaka Toseo. Electron scale magnetic reconnections in laser produced plasmas. Reviews of Modern Plasma Physics 7, 33–1 (2023); https://doi.org/10.1007/s41614-023-00125-4.Magnetic reconnection is a fundamental process in the universe, in which magnetic field energy is converted into plasma kinetic energy associated with a topological change in the magnetic field. Magnetic reconnections have been extensively investigated in space in the form of solar terrestrial plasmas, and also in laboratories in the form of magnetic confinement plasmas and laser-produced plasmas. Macroscopic features of magnetic reconnections can be well described in the context of magnetohydrodynamics (MHD) across a wide variety of research fields. However, how the kinetic regime of magnetic reconnection should be connected to the macroscopic MHD regime is still an open question. It is generally assumed that electron dynamics play an essential role in the triggering mechanism of magnetic reconnections. In this review, we discuss magnetic reconnections on the electron scale, focusing in particular on laboratory experiments using high-power lasers
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
PIC Simulation Study of Merging Processes of Two Spheromak-Like Plasmoids
No full text0000-0002-4040-2747Two different types of merging processes of spheromak-like plasmoids (SPs) without any external guide-field (toroidal) component, which are confined in a rectangular conducting vessel, have been investigated by means of two-dimensional PIC simulation, i.e., counter-helicity merging and co-helicity merging processes. The merging time scale is given by the transit time for ion sound wave to travel from the center of SP in the initial profile to the reconnection point for both cases. Through the counter-helicity SP merging process, toroidal magnetic field energy is effectively converted to thermal energy, while the energy transfer rate is suppressed to lower value for the co-helicity case because most of the toroidal magnetic field energy does not dissipate in the merging process. The reconnection process is impulsive for both cases, and, thus, the released energy is locally distributed around field lines connected to a reconnection point and forms the high temperature region with a spatial structure dependent on Larmor radius and the merging processes
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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