1,721,055 research outputs found
Fundamental and 3-rd harmonic АС magnetic susceptibility of over-doped polycrystalline Y1-xCaxBa2Cu3O7-δ (x=0.025 and x=0.20) samples
No full textThe inter-granular vortex dynamics of two polycrystalline samples Y1−xCaxBa2Cu3O7− (x =0.025 and 0.20) with different levels of over-doping is investigated by AC magnetic susceptibility measurements. The temperature dependence of the fundamental and 3-rd harmonic components of AC magnetic susceptibility shows that the sample with higher Ca content and level of over-doping is less influenced by the change of the AC magnetic field
amplitude and frequency. The better inter-granular transport properties for sample Y0.80Ca0.20Ba2Cu3O7− are related to the S-N-S type of the inter-granular links. The observed
samples’ behavior is compared to the theoretical models of the AC magnetic response of a superconductor. The dynamical processes show a strong effect upon the inter-granular
transition for both samples. Finally, a significant temperature misalignment between the imaginary components of the fundamental and 3-rd harmonic AC magnetic susceptibility is
observed
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Multiferroic single crystals with layered structure in Pb-Mn-Ni-Ti-O system – growth and investigation of their properties
No full textSingle crystals in the prospective multiferroic mixed valence ((Mn3+/Mn4+) novel system Pb-Mn-Ni-Ti-O have been grown from high temperature solution. The new material is having a pronounced layered structure, which gives rise to strong anisotropy on its properties. The temperature and frequency dependences of dielectric properties have been investigated. The loss tangent’ abnormal behavior between 180 and 220K along with the measured complex impedance indicate relaxation process, attributed to small polaron hopping. Temperature dependent transport measurements have been performed and the thermal activation energy has been estimated. The multiferroic system Pb3(Mn7-x-yNix,Tiy)O15 have a sophisticated magnetic nature, which has been investigated by means of DC magnetization and linear and non-linear (harmonic) AC magnetic susceptibility. There is a strong anisotropy effect on the magnetic properties and complex evolution from paramagnetic, short-range antiferromagnetic state, followed by global AF ordering at 48K and some indications for spin canted effects and spin reorientation transitions at lower temperatures. The high magnetic field experiments reveal a metamagnetic behavior
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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