1,721,017 research outputs found
EX-VESSEL MAGNETIC MEASUREMENTS IN JET: A CRITICAL ASSESSMENT OF THE COLLAR PROBE
No full textThe paper reviews a set of magnetic probes which was installed in JET in order to improve the field measurements
in the proximity of the iron, and focuses in particular on one of them. The set consists of six Limb probes, attached
to the upper horizontal iron yokes, and one Collar Probe, inserted in the collar region of the iron structure. The
probes include pick-up coils, flux loops, Hall sensors, and a temperature sensor.
The data provided by the system are regularly acquired and recorded within the set of JET Pulse Files. They
can be used in studies implying measurement of the stray field due to the residual magnetization, as well as for all
the modeling activities involving 3D studies, in particular resistive wall mode studies, more accurate modeling for
the vertical stabilization, interactions between NBI and magnetic field. In addition, the experience gained with
Hall transducers is considered valuable in view of their potential use in ITER.
Unlike the limb probes, the collar probe did not pass the functional commissioning, due to an unexpected
discrepancy between the signals from Hall sensors and pick-up coils. The analysis illustrated in the paper shows
that a critical assessment of the local configuration and a suitable magnetic modeling solve the issue of the
observed discordance, by putting it in relation with a local geometrical effect due to the peculiar shape of the
ferromagnetic collar teeth.
The improvement of magnetic models targeted to the prediction of signals produced by magnetic sensors
is important, also considering that a large number of magnetic probes in ITER will be located close to the
ferromagnetic inserts
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
Color-Doppler e mdc per ecografia (Levovist) nel follow-up dell'epatocarcinoma dopo chemioembolizzazione arteriosa
No full textVariations 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
COMPFLUX: a tool for the analysis of the effects of spurious sources and geometrical imperfections on the magnetic measurements in fusion devices
Full text linkIn nuclear fusion devices there are several measurement systems, devoted to the evaluation of many physical quantities of interest for plasma confinement, like the energy confinement time, the poloidal beta, etc. Because of manufacturing and installation imperfections, the geometry of the real sensors differs from the ideality, thus affecting the measurements they carry out. The tolerable range for geometrical imperfections can be estimated by a sensitivity analysis.
The COMPFLUX electromagnetic numerical code allows computing magnetic fields and fluxes generated by axisymmetric massive, as well as general filamentary currents, also in the presence of magnetized materials. It has been designed so as to carry out wide, accurate and fast sensitivity analyses. We show the main features of this suite with an example of application to the diamagnetic flux measurement in a fusion device
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
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