1,720,958 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
Diffusion of spins in a strongly spatially varying local magnetic field
Full text linkMathematical and Physical Sciences: 1st Place (The Ohio State University Denman Undergraduate Research Forum)In recent years, the field of spintronics has gained immense interest in the research community. In conventional computing, data is encoded by turning electrical signals on and off; with spintronics, data is encoded with electron spin, allowing for new electronic devices that can move more data at reduced voltages. To further this field, an understanding of spin behavior at the local level is necessary. In my group, magnetic force detection experiments are being used to understand these local phenomena. In these experiments, a micro-magnetic probe couples to the spins generated in a gallium arsenide sample. The sample in these experiments is a 2 micron thick n-GaAs (3e16 cm-3 Si doped) epitaxial membrane. Spins were injected into the membrane over a 10 micron region using standard optical pumping techniques. My presentation focuses on numerical analysis of the spin diffusion equation to better understand the effects of the local magnetic field generated by the probe tip. These simulations provide spatial maps of spin polarization. They also provide information concerning the procession of the spins about an external transverse magnetic field. These were simulated for the conditions experienced by the sample in the experiment. A key result is that the presence of localized, strongly inhomogeneous magnetic fields leads to spatial features in the spin distribution smaller than the injection spot size. These changes in the spatial maps and spin precession due to an external magnetic field as a function of the magnetic tip position can help obtain information regarding spin diffusion, precession, and relaxation with enhanced spatial resolution. The strong field gradients produced by local spin features can also increase the signal in magnetic force microscopy of the sample.OSU ENCOMMCEMNSFDOE Office of ScienceAcademic Major: Electrical and Computer Engineerin
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
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Acoustically Driven Ferromagnetic Resonance for Device Applications
Full text linkMagnetic devices have become increasingly integrated into modern technology as they enable technologies as varied as computer hard drives, RF circulators, and medical diagnostic equipment. Electrically controlling magnetism in the small scale, however, has always been difficult due to the inefficiencies of generating the localized nanoscale magnetic fields necessary to precisely control such devices. Traditional macroscale methods (such as simple Oersted fields) fail when scaled to the sizes of modern device components, and even the most efficient established techniques (spin transfer torque, spin hall effect) are current-based and thus dissipate substantial power when used to switch magnetic elements.Recent work in the field of multiferroic materials has opened the potential for using voltage, rather than current, to manipulate magnetism in these systems, potentially increasing the efficiency of nanoscale magnetic control by several orders of magnitude. In this thesis, we explore the Acoustically Driven Ferromagnetic Resonance effect in composite strain-coupled multiferroic bilayers. This technique allows for a voltage-driven piezoelectric excitation to drive magnetostrictive thin films into resonance with a much greater coupling efficiency than is possible using traditional methods. By leveraging this enhanced coupling, it is possible to develop a number of novel devices based on this interaction that span a number of extremely important commercial fields.This thesis experimentally explores the dependence of this effect on a number of factors such as operating frequency, input power, magnetic element size and thickness, and magnetic element composition. We also study three high-potential applications for this technology: magnetic sensing, antenna miniaturization, and room-temperature coupling to quantum systems - specifically diamond nitrogen-vacancy centers. While some of these applications are far from commercial readiness, we are able to demonstrate proof-of-concept examples for each of these concepts that demonstrate that the core concept is valid and is worth further exploration
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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