1,721,050 research outputs found
Anisotropy and directional pinning in YBa2Cu3O 7-x with BaZrO3 nanorods
No full textMeasurements of anisotropic transport properties (dc and high-frequency regime) of driven vortex matter in YBa2Cu3O 7-x with elongated strong-pinning sites (c-axis aligned, self-assembled BaZrO3 nanorods) are used to demonstrate that the effective-mass angular scaling takes place only in intrinsic physical quantities (flux-flow resistivity), and not in pinning-related Labusch parameter and critical currents. Comparison of the dynamics at different time scales shows evidence for a transition of the vortex matter toward a Mott phase, driven by the presence of nanorods. The strong pinning in dc arises partially from a dynamic effect. © 2013 Author(s)
Directional pinning and anisotropy in YBa2Cu3O 7-x with BaZrO3 nanorods: Intrinsic and nanorods-induced anisotropy
No full textWe present a study of the anisotropic vortex parameters as obtained from measurements of the microwave complex resistivity in the vortex state with a tilted applied magnetic field in YBa2Cu3O7-x thin films with BaZrO3 nanorods. We present the angular dependence of the vortex viscosity η, the pinning constant kp and the upper limit for the creep factor χM. We show that the directional effect of the nanorods is absent in η, which is dictated by the mass anisotropy γ. By contrast, pinning-mediated properties are strongly affected by the nanorods. It is significant that the pinning and creep affected by the nanorods is detectable also at our very high operating frequency, which implies very short-range displacements of the vortices from their equilibrium position. © 2014 Elsevier B.V. All rights reserved
L'insediamento subappenninico di Conelle di Arcevia (Ancona)
No full textSi presentano i risultati dello studio dei materiali ceramici provenienti da Conelle di Arcevia (AN), scavi Puglisi 1958-1969, riferibili al Bronzo recente. I materiali presi in esame sono attribuibili principalmente ad una fase antica del Subappenninico, anche se la presenza di elementi più tardi potrebbe far ipotizzare un’occupazione in un momento avanzato della stessa facies. Sono stati rinvenuti anche alcuni frammenti decorati ad incisioni ed excisioni, i quali, data la loro esigua presenza tra i materiali provenienti dagli scavi Puglisi, potrebbero testimoniare un permanere di tale stile decorativo anche nei periodi successivi all’Appenninico. The authors present the results of the study of ceramic material from the excavation of Conelle di Arcevia, by Puglisi (1958-1969), ascribed to the Late Bronze Age. The material examined can be mainly attributed to an ancient phase of the Subapennine, even if the presence of later elements could suggest a more recent occupation of the site during the same culture. Among the fragments analysed, some are decorated with incisions and excisions, which, even if the quantity found in the Puglisi excavations is limited, could suggest a continuing use of these decorative styles after the Apennine period
Corrigendum to: Geology of the Victoria quadrangle (H02), Mercury (Journal of Maps, (2016), 10.1080/17445647.2016.1193777)
No full textWhen the above article was first published online, the third author was incorrectly listed as F. Ferranti. This has now been corrected
Multi-objective optimization of takeoff and landing procedures: level abatement vs quality improvement of aircraft noise
No full textGeology of the Kuiper quadrangle (H06), Mercury
Full text linkThe Kuiper quadrangle (H06) is located at the equatorial zone of Mercury and encompasses the area between 288°E–360°E and 22.5°N–22.5°S. Using the NASA MESSENGER data, we compiled a geological map of the quadrangle at a 1:3,000,000 scale. The mapping was mainly based on photo-interpretation of an MDIS (Mercury Dual Imaging System) monochrome 166 m/pixel basemap. Additional datasets were also considered: stereo-DTM of the region, mosaics with high-incidence illumination, and the MDIS global color mosaic. The map shows that the quadrangle is characterized by the prevalence of crater materials which are distinguished into three classes based on their degradation degree. Different plain units were also identified and classified on the basis of their density of cratering. Several structures, mainly represented by contractional faults, were mapped in all quadrangle areas. The map represents the first complete geologic survey of H06 at this scale and provides a highly detailed analysis of the Kuiper quadrangle’s surface geology
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
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