1,721,177 research outputs found
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
NOVEL NANO-TEMPLATE TECHNOLOGY AND ITS APPLICATIONS TO THE FABRICATION OF NOVEL PHOTONIC DEVICES
No full textkoamabayili/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
Electrical characterization of 2DEG transport properties in In0.14Al0.86N/AlN/GaN heterostructures
No full textInAlN/AlN/GaN heterostructures have a high potential to be used in HEMTs because of
their ability to provide high electron mobility and high 2D electron gas density. Here we report
the characterization of MOCVD grown Al0.84In0.16N/AlN/GaN heterostructures using Four Probe
Current-Voltage (I-V) measurements. InAlN/AlN/GaN heterostructures with for different AlN
interlayer thicknesses (0-7.5nm) and also different barrier layer thicknesses have been explored.
The four probe Current-Voltage measurements have been performed at room temperature. A
change of the conduction mechanism has been observed and a model has been developed to
extract the 2DEG properties by the current-voltage characteristics. By comparing I-V and Hall
effect results we could assess the reliability of common I-V analyses in the determination of the
major transport properties of the 2DEG.. This work was supported by the EU under Project No.
PITN-GA-2008 213238_RAINBO
Defect investigation in In(Ga,Al)N-related alloy by SPM methodology
No full textNitride based alloys such as InGaN, AlInN, AlN, InN alloys and their heterostructures have attracted a lot of attention for different applications as photovoltaic solar cells, high mobility transistors (HEMT) and light emitting devices. The strong polarization fields and good free carrier confinement at the interface, the flexibility in tuning the energy gap form the basis of achieving high quality device properties in HEMTs, LEDs, LASERs, etc. The achievement of this target is hindered by the difficulty in growing high quality epitaxial layer, due to high lattice mismatch and high thermal expansion coefficients indifferences between InN and GaN or AlN. As a result, these epilayers are highly strained and are prone to relaxation by elastic or non-elastic process, leading to the formation of structural defects.
Here we will investigate the electronic and optical properties of structural defects such as threading dislocations, trenches and slip planes in indium-rich InGaN and AlInN epilayers. The electronic properties have been investigated by various Scanning probe microscopy such as Scanning Capacitance Microscopy (SCM), Kelvin Probe Force Microscopy (KPFM) and Conductive Atomic Force Microscopy (CAFM). These defects have been found to be related with leakage current paths, carrier localization and change in surface potential. The effect of these structural defects on optical properties has been investigated by Cathodo-Luminescence (CL), while their recombination strength has been studied by Electron Beam Induced Current (EBIC) measurements. The presence of a high density of threading dislocations has a detrimental effect on the emission in indium-rich InGaN. The present results on the optical and electronic properties of threading dislocations are correlated to the emission efficiency of these heterostructures investigated by photoluminescence (PL). Apart from the electronic and optical properties, their impact on the electrical devices has also been investigate
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