1,720,979 research outputs found
Indirect diagnosis of pavement structural damages using surface GPR reflection techniques
No full textThe safety and operability of road networks is, in part, dependent on the quality of the pavement. It is known that pavements
suffer from many different structural problems which can lead to damage to the pavement surface. To minimize the effect of these
problems programmed policies for pavement management are required. Additionally a given local anomaly on the road surface can
affect the safety of the road to various degrees according to the category of the road, so it is possible to set up different programmes
of repair according to the different standards of road.
Programmed policies for pavement management are required because of the wide structural damage which occurs to pavements
during their normal operating life. This has consequences for the safety and operability of road networks. During the last decade,
road networks suffered from great structural damage. The damage occurs for different reasons, such as the increasing traffic or the
lack of means for routine maintenance. Many forms of damage, originating in the bottom layers are invisible until the pavement
cracks. They depend on the infiltration of water and the presence of cohesive soil greatly reduces the bearing capacity of the subasphalt
layers and underlying soils. On the basis of an in-depth literature review, an experimental survey with Ground Penetrating
Radar (GPR) was carried out to calibrate the geophysical parameters and to validate the reliability of an indirect diagnostic method
of pavement damage. The experiments were set on a pavement under which water was injected over a period of several hours. GPR
travel time data were used to estimate the dielectric constant and the water content in the unbound aggregate layer, the variations in
water content with time and particular areas where rate of infiltration decreases. A new methodology has been proposed to extract
the hydraulic permittivity fields in sub-asphalt structural layers and soils from the moisture maps observed with GPR. It is effective
at diagnosing the presence of clay or cohesive soil that compromises the bearing capacity of sub-base and induces damage
Design and Cahracterization of a 10-Gb/s Dual Drive Z-Cut Ti:LiNbO3 Electrooptical modulator
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
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