186,327 research outputs found
Helical plasma-wall interaction in the RFX-mod: Effects of high-n mode locking
No full textThe purpose of this paper is to analyse higher toroidal harmonics m = 1 with 7 < n < 23 (secondary modes) in the quasi single helicity, reversed field pinch plasma in the RFX-mod device. The quasi single helicity is an improved confinement state characterized by a dominant mode m/n = 1/7, rotating along the toroidal direction. The spectroscopic measurements in the boundary plasma show footprints of a localized plasma deformation called 'phase locking', which can be described as an interferential pattern of toroidal Fourier harmonics. In the locking region the magnetic field lines are deformed in large poloidal lobes hitting the plasma facing components, a mechanism similar to the 'homoclinic lobes' observed in the Tokamak divertor with RMP application. Correspondingly, the magnetic connection length to the wall presents a strong decrease ('hole') with increased plasma-wall interaction, which fortunately is not stationary, but jumps in the toroidal direction thanks to the effective action of the RFX-mod feedback system. The global plasma wall interaction is the superposition of a rotating helix and of the localized toroidal deformation due to the secondary modes, which mirrors the local emission and particle influx from the wall. The local edge perturbation impacts also on the global plasma performance: a threshold to obtain an electron transport barrier has been identified. An improvement in plasma performance is expected in the upgraded device RFX-mod2, where the magnetic boundary will be modified to decrease the edge field deformation by a factor about 2
Osservazioni stratigrafiche e considerazioni paleoambientali preliminari nell'area di Galliera (Bologna). Una prospettiva di ricerca integrata nei rapporti tra insediamento e paleoambiente nella pianura d'età medievale.
No full textRiassunto - Viene succintamente riletta tutta la documentazione storico-archivistica relativa all’area indagata, evidenziando gli spunti problematici degli aspetti fisico-ambientali in un arco cronologico esteso dall’altomedioevo al XVIII secolo, con l’obiettivo di fornire una taratura ai primi dati stratigrafici originali prodotti. Si provvede ad una prima ricostruzione dell’evoluzione della Rotta Panfilia ricavandone gli ordini di grandezza dei tassi fisiologici di sviluppo e se ne suggeriscono i precedenti. Si propone una preliminare analisi dell’esondabilità pregressa del territorio altomedievale. Si contestualizza l’area geomorfologicamente tentando l’integrazione tra aspetti morfologici e stratigrafici, sottolineando gli argomenti di interesse ed attenzione per una futura analisi geoarcheologica. Si propone il medesimo livello di attenzione analitica per tutte le altre realtà microinsediative medievali note nel territorio ma finora mai sondate. Si suggerisce un termine post quem (1134 d.C.) per l’avulsione inferiore che condusse il fiume medievale nel sottodominio centese.
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Indice – Dati storico documentali (la Torre di Galliera; il centro abitato; lo Scolo Riolo; il Fluvius di Galliera; la Coronella di Galliera; il “Terrazzone”). Inquadramento geomorfologico (la Rotta Panfilia; i dossi di Reno A e B). Una prospettiva ambientale fisica: la taratura paleoidraulica e la paleomorfologia (la sezione dell’alveo di Reno al Gallo). Stratigrafie e contesto locale. Confronti stratigrafici. Conclusioni
Scavi sulla Rocca di Garda (VR)
No full textSintesi delle ricerche archeologiche presso la Rocca di Garda (VR
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
No full textWe 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
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
Slow versus traditional strength training in obese female participants: preliminary results
No full textThe aim of this study was to provide comparative data on a slow versus a traditional supervised resistance training in an obese female population. Forty obese female patients admitted to our rehabilitation hospital were assigned randomly to a slow training group (STgroup; mean age: 47.44 years, mean BMI: 38.53kg/m2) and a traditional training group (TTgroup; mean age: 54.34 years, mean BMI: 39.37kg/m2). The ST protocol included five repetitions for five consecutive bouts on the leg press and extension machine. The duration of each repetition (concentric+eccentricphases)was6sforlegpressand5s for leg extension. The initial load was 50% of the one repetition maximum and then gradually reduced by 20% for each bout. The TT protocol included six consecutive repetitions for five bouts on the leg press and leg extension with 80% of the one repetition maximum load. Both groups performed10sessions.Allofthepatientswereassessedby a visual analogue scale for pain, a Borg scale for subjective fatigue, and an isokinetic strength test. Statistically significant strength improvements were observed in both groups.InSTgroup,statisticallysignificantimprovementsin visual analogue scale scores for knee pain were found at
post, larger than that observed in TTgroup. Subjectively perceived fatigue on the Borgscale decreasedmoreat post in STgroup in comparison with TTgroup. Our preliminary data suggest that ST may represent a preferential strengthening method in obese patients as it can lead to significant strength gains with a relatively lower loading effect on the knee, and hence reduced perception of pain
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