1,721,637 research outputs found
Two-dimensional non-linear model of reversed field pinch plasma evolution
No full textA two-dimensional non-linear equilibrium code, able to simulate reversed field pinch (RFP) discharges, has been developed. It is based on the two-dimensional MHD equilibrium code MAXFEA, which has been properly modified by introducing RFP profiles of the poloidal current density flux function in accordance with the μ&p model. In particular, equation parameters consistent with available data from the RFX machine have been used. A complete mesh of the RFX poloidal field system has been prepared and the whole poloidal electrical circuit has been implemented into the code. The RFP equilibrium code has been successfully validated against some RFX experiments, with and without plasma
Dynamic identification of plasma magnetic contour in fusion machines
No full textThe paper presents a method to identify the plasma magnetic contour in fusion machines, when eddy currents are present in the conducting structures surrounding the plasma. The approach presented is based on the integration of an electromagnetic model of the plasma with a lumped parameters model of the conducting structures around the plasma. This approach has been validated against experimental data from RFX, a reversed field pinch machine
Dynamic identification of plasma magnetic contour in fusion machines
No full textThe paper presents a method to identify the plasma magnetic contour in fusion machines, when eddy currents are
present in the conducting structures surrounding the plasma. The approach presented is based on the integration of
an electromagnetic model of the plasma with a lumped parameters model of the conducting structures around the
plasma. This approach has been validated against experimental data from RFX, a reversed field pinch machine
Modulation of motor excitability induced by action observation in stroke patients
No full textAction observation activates the same motor areas as those involved in the performance of the observed actions and promotes
functional recovery following stroke. Movement observation is now considered a promising tool for motor rehabilitation, by
allowing patients to train their motor functions when voluntarymovement is partially impaired.We asked chronic-stroke patients,
affected by either left (LHD) or right hemisphere (RHD) lesions, to observe either a left or right hand, while grasping a small target
(eliciting a precision grip) or a large target (eliciting a whole hand grasp directed towards a target object). To better understand
the effects of action observation on damaged motor circuits, we used transcranial magnetic stimulation (TMS) to induce motor
evoked potentials (MEP) from two muscles of the unaffected hand in 10 completely hemiplegic participants. Results revealed that
LHD patients showed MEP facilitation on the right (contralesional) M1 during action observation of hand-object interactions. In
contrast, results showed no facilitation of the left (contralesional) M1 in RHD patients. Our results confirm that action observation
might have a positive influence on the recovery of motor functions after stroke. Activating the motor system by means of action
observation might provide a mechanism for improving function, at least in LHD patients
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
Cell cycle perturbations and cytogenetic damage induced by low energy protons in human primary fibroblasts
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
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
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