1,721,017 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
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
Laser trapping and micro-manipulation using optical vortices
No full textThe aim of this work is to investigate the usefulness of the Laguerre-Gaussian (LG) beams, often referred to as optical vortices, for laser trapping and manipulation experiments that cannot be performed using Gaussian beams. Laguerre-Gaussian beams, exhibiting "doughnut"-like transversal intensity distributions and carrying orbital angular momentum (OAM), greatly extended the capabilities of laser tweezers. These beams can be obtained by converting the Gaussian beam generated by a common laser source, by means of property designed diffractive optical elements (DOEs). We present two trapping systems, the first one based on amplitude DOEs, the second one based on phase DOEs. In both cases the DOE is implemented on a liquid crystal display. Trapping of small dielectric high-index particles on the "doughnut" profile is demonstrated. OAM transfer to trapped particles, that are caused to rotate, is observed as well. Moreover, low-index particles, that would be rejected by a conventional Gaussian beam, are trapped in the zero intensity region of the doughnut
Fabrication of a microfluidic platform for investigating dynamic biochemical processes in living samples by FTIR microspectroscopy
No full textHere we present the optimization of fabrication steps for realizing an infrared–visible microfluidic chip to
study single-living cell behaviour in physiological environment by synchrotron radiation FTIR microspectroscopy.
We optimized subtractive and additive lithographic processes on CaF2 substrate, employing XARP
3100/10 photoresist both as etching-mask and for the device fabrication. Using prototype microfabricated
liquid cells 9 and 5 lm thick, we measured the response of small groups of THP1 monocytic cells
to mechanical compression and chemical stimulation with fMLP using conventional IR globar source,
aiming to evaluate biochemical rearrangements of leukocytes during the capillary circulation or recruitment
processes. Stimulated monocytes have spectral features recognizable, differentiating them from unstimulated,
especially affecting the spectral region 1280–1000 cm1, characteristic of nucleic acids and
carbohydrates, and specific band ratios, such as proteins on lipids and methylene on methyl. Spectra variations
have been correlated with biochemical events such as transcription, synthesis of new-proteins and
variations in membrane fluidity
Gaussian to rectangular light beam redistribution using computer generated phase elements
No full textSome considerations on the design of computer generated phase elements applied to the intensity redistribution of Gaussian light beams are presented in this paper. The computer generated phase elements are designed using an iterative transform algorithm for Fresnel domain. Parameters which influence the performances of these algorithms and the computation time are discussed. Results obtained by computer simulations are presented for three different Gaussian beam shaping (flat-top, 2 shifted gaussians, acronym)
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