1,720,979 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
A single-chip micro-opto-electro-mechanical system for optical coherence tomography imaging
No full textEKL Processin
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
An Evaluation of Silicon Carbide Based Bimorph Actuators for Optical Coherence Tomography Applications
No full textOptical coherence tomography (OCT) probes rely on MEMS micro-scanners to provide fast and reproducible scans covering as much area as possible. A popular choice of actuators employed in this role are electrothermal bimorph actuators. They comprise of two layers of different materials which are rigidly joined together. Differential expansion under heating causes the bimorph to deflect. Polycrystalline silicon carbide has been proposed to replace polysilicon as a multi-purpose material in MEMS but it has not been yet explored as a bimorph material. Under this premise, an in-plane bimorph actuator based on doped polycrystalline silicon carbide and silicon was proposed to fulfill the requirements of an OCT probe. This actuator suffered from yield and reliability issues, which were, however, linked primarily to the design and not the material itself. Therefore, in order to evaluate silicon carbide as a bimorph “hot” layer, an optimization and characterization procedure was carried out to determine its relevant mechanical, thermal and electrical properties. Specifically, the residual stress, Young modulus, coefficient of thermal expansion, thermal coefficient of resistance and electrical resistivity were determined. The layer residual stress and resistivity could be reduced by adjusting the SiH2Cl¬2, C2H2 and NH3 gas ratio¬, achieving 0.03 ? cm and 300 MPa respectively. The resistivity of the layer is adequate for it to act as a heater. The electrostatic pull-in instability technique was used to extract the Young modulus for different layers and it was found to decrease with increasing Si/C composition, with a value of 250 GPa for our selected optimum layer. The coefficient of thermal expansion was determined through fabricated v-beam actuators to be 4.3 ppm/K which indicates that SiC must be heated more to produce strain comparable to other bimorph ”hot” materials. As a final step in poly-SiC evaluation, we constructed rudimentary bimorph poly-SiC/SiO¬2 cantilevers which were subsequently used to test the static and dynamic performance of this material combination. Our conclusion is that poly-SiC is a good bimorph “hot” material that operates optimally at higher temperatures, can be used in more diverse bimorph designs and is more suited to applications that require high force. Throughout the material characterization process, we used numerical and analytical models extensively. This helped us identify good modelling practices and led to the refinement of the models, allowing us to obtain better matching between theoretical predictions and experimental data. Based on these findings of the poly-SiC properties and better models, we propose a novel in-plane, spring form actuator for use in an OCT micro-scanner. It employs a poly-SiC/SiO2 material combination in a mechanical amplifying geometry and in simulation, it achieves 80.9 mN of force and 250 ?m of displacement at 43 mW power consumption and a 0.3 mm2 footprint. All these parameters are an improvement over the initial design.ECTMMicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
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
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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