1,721,220 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
The application of nuclear physics processesfor diamond detection within kimberlite
No full textThesis (M.Sc. (Applied Radiance Science ) North-West University, Mafikeng Campus, 2013Mineral-PET (Positron Emission Tomography) is a new concept envisaged to revolutionize diamond-mining
operations. The idea is that diamond inclusions may be detected at an early stage. This
allows for rejection of barren material from the processing stream, which greatly reduces the costs.
The diamond recovery may also be more efficient. In fact, not only the presence but also the size
and relative position of the diamond inclusion in the host kimberlite rock may be determined. This
allows for grading and differentiated extraction techniques, which may protect larger diamonds.
The process involves the use of the (y,n) interaction at the Giant Dipole Resonance energy of carbon
to produce a radioactive carbon-11 PET isotope to label the presence of possible diamonds.
This is followed by the use of an analogue of the medical Positron Emission Tomography (PET)
diagnostic method to detect the evidence of diamonds in the kimberlite.
The Mineral-PET process has an activation stage. to generate the 11C positron-emitting isotope in
the kimberlite, and a detection stage, where the occurrence of hot-spots in the PET signal may
distinguish diamondifcrous from barren kimberlite. This dissertation makes a contribution in the
detection part. Specifically, experimental work has been done on absorption length measurements
for kimberlite, as well as a study of the noise reduction capacity of the co-incident detection technique.
The former measurement was used as input for computational simulations. The latter
measurement \\as part of the verification of the feasibility calculation for the system as a whole.
Computer modeling by Monte Carlo methods ha been used in order to simulate the Mineral-PET
system. In this work, the aspects of the Mineral-PET system that were simulated relate to the
efficiency of the detectors and the absorption length of radiation by the kimberlite.Master
To study the mobility of the naturally occurring radioactive materials (NORMs) in the sediments as a function of changing environmental conditions
Full text linkAbstract: Please refer to full text to view abstractM.Phil. (Energy Studies
The mineral-PET rock sorter : a study of the ( y,n) activation process
Full text linkMSc (Radiation Science), North-West University, Mafikeng CampusPositron Emission Tonwgraphy is a technique used for imaging in diagnostic medicine. In
this technique a nutrient is labeled with a positron emitter and imaging of the metabolic
uptake rates is performed. Mineral-PET uses an analogous process where a diamond inside a
kimberlite rock can be imaged in an on-line mining situation.
The diamond is PET-inactive and therefore a minute fraction of carbon atoms need to be
temporarily activated as a positron radiation source. Gamma radiation is used to convert
the dominant carbon-12 isotope to the positron emitter isotope carbon-11, via the gammaneutron
(y,n) nuclear reaction. The emitted positron thermalizes and annihilates with an
electron resulting in two back-to-bad<: gamma photons, each at 511 keV energy, which is then
detected by the matrix of position sensitive fast timing BGO (bismuth germanate- Bi₁₂Ge₄O₄)
detectors.
This study investigate the activation process where gamma photons in the energy range of
around 25 lVIe V are produced by bremsstrahlung from an electron beam, where a high atomic
number material is used as a target. The study then concludes on the parameters of accelerator
design (i.e. converter type and thickness and electron beam energy) based on the feasibility
study of the new technology.Master
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