1,720,983 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
Power-Optimized Topology Formation and Configuration in Bluetooth Sensor Networks: An Experimental Approach
No full textLow power consumption is a critical issue in wireless sensor networks. To achieve it, a number of arguments exist in favor of ad-hoc architectures and communication protocols, with high power optimization potential. These architectures, however, lack interoperability, as opposite to standardized wireless protocols. In this paper we present and validate experimentally a variable-granularity power model of Bluetooth and apply it to solve variable-complexity power optimization problems, with the goal of making the protocol viable for wireless sensor network scenarios. Among such optimizations, a set of heuristic rules is derived to build power-optimal Bluetooth scatternet topologies, which unlike most Bluetooth topology formation schemes stem directly from experimental evidence
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
Chemical evolution in the Earth’s mantle and its explanation based on piezonuclear fission reactions
No full textThe anomalous chemical balances at the major events in the
geomechanical and geochemical evolution of the Earth’s crust should be considered
as indirect evidences of piezonuclear fission reactions. Recent results observed at
the scale of the Earth’s crust and reproduced at the scale of the laboratory during
quasi-static and repeated loading experiments may be extended to the different
layers of the planet like the atmosphere and the bulk Earth (mantle and external
core). The mantle of our planet is characterized by very high pressures and
temperatures (~150 GPa and ~4000 C) that could favour this kind of reactions.
In the present paper, it is shown that the most important chemical changes in the
Earth’s crust evolution may be recognized also at the internal Earth’s layers. Recent
investigations have shown that also the mantle is characterized by significant
compositional time variations. This evolution may be interpreted in the light of
the same nuclear reactions recently proposed to explain the chemical changes in the
Earth’s continental crust and atmosphere through the entire life of our planet
Piezonuclear fission reactions triggered by fracture and turbulence in the rocky and gaseous planets of the Solar System
No full textEvidences from the planets of the Solar System are presented and
interpreted in the light of piezonuclear fission reactions. In particular, results coming
from different investigations are reported for the crust of Mars. They were made
available by NASA space missions during the last 15 years. The concentration
increment in certain elements (Fe, Cl, and Ar) and the corresponding decrement in
others (Ni and K), together with neutron emissions at Mars largest faults, should be
considered as directly correlated phenomena. The findings presented provide a clear
evidence of how seismic activity has contributed to the Red Planet’s compositional
evolution. Analogous evidences regard Mercury, Jupiter, and the Sun itself. The
major compositional variations are interpreted according to piezonuclear fission
reactions triggered by earthquakes in rocky planets and by storms in gaseous planets
as well as in our star. These conjectures, which were originated from the analysis of
geological and geophysical evolution of the Earth’s crust, are based on recent
evidence of neutron and alpha particle emissions during brittle fracture experiments
carried out on inert non-radioactive rocks (granite, basalt, magnetite, marble)
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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