1,721,000 research outputs found
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
ELECTRON PARAMAGNETIC RESONANCE IN CADMIUM(1-X)MANGANESE(X)TELLURIDE, CADMIUM(1 X)MANGANESE(X)SELENIDE AND CADMIUM(1-X)MANGANESE(X)SULFIDE (DILUTED MAGNETIC, SEMICONDUCTORS, EXCHANGE NARROWING, SUPEREXCHANGE, EPR)
No full textWe present the results of a systematic investigation of EPR in the Cd based DMS, namely, Cd(,1-x)Mn(,x)Te, Cd(,1-x)Mn(,x)Se and Cd(,1-x)Mn(,x)S, over a wide range of temperatures (1.3K - 250K) and sample compo- sition. The EPR measurements were made on a 35GHz transmission spectrometer, using circular polarization and Faraday effect tech- niques. The Faraday technique is perfected by showing that the fits to the experimental lineshapes are considerably improved if we employ a mixture of Faraday rotation and ellipticity. The EPR behaviour in all the three compounds is qualitatively identical: the absorption lineshape is Lorentzian, and broadens with increasing Mn concentration and decreasing temperature. At very low temperatures, of samples with a high Mn concentration, the line- shape deviates from Lorentzian behaviour and the resonance shifts to lower fields. We also establish the dependence of EPR linewidth on the anion of the host lattice. Over a wide range of sample compo- sition and temperatures, for a fixed temperature and Mn concentra- tion, given a particular cation, the linewidth in the order: sulfide, selenide and telluride. The Lorentzian regime linewidth is analyzed using exchange narrowing theory. While it appears that the EPR in the sulfide may be dipolar broadened, the linewidth in the selenide and telluride cannot be explained by dipolar anisotropy alone. The dominant anisotropy in the latter cases must come from the anisotropic part of the exchange interaction, and we speculate the the spin-orbit coupling of the anion has to play a role. The Dzyaloshinski-Moriya interaction offers a promising solution to this problem. At high tem- peratures, the x dependence of the linewidth is much stronger than predicted by exchange narrowing--the linewidth almost goes as x(\u272), while theory yields approximately a SQRT.(x) behaviour. This discrep- ancy is attributed to temperature dependent factors which are neglected in the infinite temperature theory. In all the three systems studied, for x(, )\u3e 0.20, the temperature variation of the linewidth is a universal function of reduced temperature T/T(,0). The variation of the scaling temperature T(,0) with x resembles that of the spin glass temperature T(,g). The non-Lorentzian lineshapes at low temperatures are exam- ined using the Kubo-Toyabe theory. We find that the theory cannot explain the lineshapes in DMS, and the problem remains unresolved
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
Topological Insulator Heterostructures: Searching for Exotic Particles on a Bench Top
No full textPresented on October 8, 2012 from 3:00 pm to 4:00 pm in IBB Building room 1128 on the Georgia Tech campus.Runtime: 58:14 minutes.A triumph of contemporary physics is the highly successful description of the most fundamental constituents of Nature and their excitations. Recent theories of “topological insulators” [1,2] have shown that in the complex and emergent world of condensed matter physics, one can engineer the interplay between fundamental symmetries, band structure and spin-orbit coupling to create novel energy-spin-momentum relationships for band electrons and to yield effective realizations of exotic particles predicted but yet unobserved in Nature. This Colloquium will describe the experimental routes we are pursuing in this context to build "detectors" for such particles, by coupling the surface states of a topological insulator with the gauge symmetry breaking effects of superconductivity [3] and the time-reversal symmetry breaking effect of magnetism [4.5]. 1. M. Z. Hasan and C. L. Kane, Rev. Mod. Phys. 82, 3045 (2010). 2. Xiao -Liang Qi and Shou-Cheng. Zhang, Rev. Mod. Phys. 83, 1057 (2011). 3. Duming Zhang et al., Phys. Rev. B 84, 165120 (2011). 4. Su-Yang Xu et al., Nature Physics 8, 616 (2012). 5. Duming Zhang et al., arxiv: 1206.2908
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
