113,010 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Weakly stratified laminar flow past normal flat plates
No full textNumerical computations of the steady, two-dimensional, incompressible, uniform velocity but stably stratified flow past a normal flat plate (of unit half-width) in a channel are presented. Attention is restricted to cases in which the stratification is weak enough to avoid occurrence of the gravity wave motions familiar in more strongly stratified flows over obstacles. The nature of the flow is explored for channel half-widths, H, in the range 5 [less-than-or-eq, slant] H [less-than-or-eq, slant] 100, for Reynolds numbers, Re, (based on body half-width and the upstream velocity, U) up to 600 and for stratification levels between zero (i.e. neutral flow) and the limit set by the first appearance of waves. The fourth parameter governing the flow is the Schmidt number, Sc, the ratio of the molecular diffusion of the agent providing the stratification to the molecular viscosity. For cases of very large (in the limit, infinite) Sc a novel technique is used, which avoids solving the density equation explicitly. Results are compared with the implications of the asymptotic theory of Chernyshenko & Castro (1996) and with earlier computations of neutral flows over both flat plates and circular cylinders. The qualitative behaviour in the various flow regimes identified by the theory is demonstrated, but it is also shown that in some cases a flow zone additional to those identified by the theory appears and that, in any case, precise agreement would, for most regimes, require very much higher Re and/or H. Some examples of multiple (i.e. non-unique) solutions are shown and we discuss the likelihood of these being genuine, rather than an artefact of the numerical scheme.<br/
Thyraplax truncata Castro 2007
No full text<i>Thyraplax truncata</i> Castro, 2007 (Fig. 3) <p> <i>Thyraplax truncata</i> Castro, 2007: 683, figs 25, 26. — Ahyong 2009: 66, fig. 1A-C.</p> <p> MATERIAL EXAMINED. — <b>New Caledonia.</b> EBISCO, stn CP 2498, 24°45.0’S, 159°43.0’E, 367-536 m, 6.X.2005, 1 ♀, 7.2 mm, cw 9.7 mm (MNHN-B30794).</p> <p>REMARKS</p> <p> <i>Thyraplax truncata</i>, was described from five specimens, all males, which were collected from depths of 430- 500 m in New Caledonia and Fiji. Ahyong (2009) subsequently recorded a female from the Kermadec Is., New Zealand. A second female specimen from New Caledonia now permits the description of the female. All characters related to the morphology of the carapace and pereopods (Fig. 3A) agree with those described for the males (Castro 2007: 683, figs 25A, 26). One exception is the dark-brown tip of the cheliped fingers, which extended slightly less in the female than in the five males previously studied.</p> <p>DESCRIPTION OF THE FEMALE</p> <p>Abdomen wide.Telson triangular,slightly wider than long. Somite 3 covers space between P5 coxae and episternites 7, somite 2 only slightly narrower than somite 3, thoracic sternite8not visible.Vulva (Fig.3B) crescent-shaped, extending from edge of anteriorly deflected suture 5/6 to middle portion of thoracic sternite 6; small, triangular sternal vulvar cover on posterior margin of vulva, covering about third of aperture, soft membrane covering rest of aperture.</p>Published as part of <i>Castro, Peter, 2009, Two new species of Carcinoplax H. Milne Edwards, 1852, and Pycnoplax Castro, 2007, from the western Pacific, and a description of the female of Thyraplax truncata Castro, 2007 (Crustacea, Decapoda, Brachyura, Goneplacidae), pp. 949-957 in Zoosystema 31 (4)</i> on pages 956-957, DOI: 10.5252/z2009n4a9, <a href="http://zenodo.org/record/4520584">http://zenodo.org/record/4520584</a>
Whose "Fault" Is This? Untangling Domain Concepts in Ontology Design Patterns
No full textCertain ontology domain concepts are difficult to model due to the complexity of their definition, the number of roles that they fulfill in the ontology or the different types of relationships they participate in. To assist ontologists in overcoming some of these challenges, a comparative analysis of two Ontology Design Patterns (ODPs) has been carried out. As a result, terminology is introduced to describe the role and certain reusability characteristics of domain concepts in these ODPs. These findings provide a series of implications that make explicit certain modeling decisions that previously were implicit in the ontology modeling field. Our contribution is illustrated with a concrete example of a real world use case scenario that will benefit from the outcome of this study
Caracterização e desempenho de genótipos de abóboras e morangas para rendimento e qualidade de frutos maduros.
No full textO presente trabalho objetivou caracterizar genótipos de abóboras e morangas para rendimento e qualidade de frutos maduros. Foi avaliado um conjunto de nove genótipos de abóbora e quatro de moranga. O experimento foi instalado em condições de campo, no Núcleo Rural Tabatinga, em Brasília?DF
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
An ecosystem services approach to the ecological effects of salvage logging: valuation of seed dispersal
No full textData used to calculate the replacement cost of the natural regeneration of the Holm oak under three post-fire management scenarios in Leverkus and Castro (Ecological Applications, 2017). The data consist of a) the densities of natural regeneration in each replicate of the three treatments (“Seedling densities"), and b) the cost of reforestation with Holm oaks (“Reforestation cost data”). The calculation of the average values presented in the manuscript is reproduced in “Table 1” (for the numbers and densities of seedlings per treatment) and in “Summary of reforestation costs” (for the average cost of reforestation). For further details and study site descriptions, see the cited manuscript and the references therein
Desempenho de genótipos de arroz sob deficiência hídrica e irrigação adequada.
No full textO objetivo do trabalho foi avaliar o desempenho produtivo de genótipos de arroz de terras altas, em ambientes de irrigação adequada e de deficiência hídrica
Viveiro de Castro (Eduardo B.) Escatologia pessoal e poder entre os Arwaté
No full textViveiro de Castro (Eduardo B.) Escatologia pessoal e poder entre os Arwaté . In: Archives de sciences sociales des religions, n°68/2, 1989. p. 191
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