1,721,009 research outputs found
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
ASSESSMENT OF BURIED PIPELINES COATING AND THE CASE FOR A NEW REFLECTOMETRY BASED TECHNOLOGY
Get PDFCorrosion control of buried assets usually involves a redundant shield: a coating system as a physical barrier, and a cathodic protection system as an ad hoc defense. Characterization and localization of defects in the coatings of such assets is critical, since large defects, if left unrepaired, will not only leave the asset locally prone to corrosion, but also drain and weaken the cathodic protection for the entire structure.
Electrochemical impedance spectroscopy has been used in order to study the influence of different types of defects on the insulating capabilities of coal tar coating. Experimentation and research has led the author of this thesis to design a reflectometry based method to provide both localization and characterization of such defects. In the energy industry, most pipelines consist of several parallel lines and this method makes the most of this feature in order to overcome difficulties usually associated with time domain reflectometry, specifically the quest for reliable and adaptable baselines.
The method has been tested with success in both laboratory and field conditions. The conclusion of these tests acknowledges limitations in terms of operational distance for practical applications of this technique and confirms its usefulness for the detection of coating defects as well as other features for multiple pipelines
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
Performance of Zinc-Rich Epoxy Primers Containing Carbon Nanotubes on the Corrosion Protection of Carbon Steel in Simulated Concrete Pore Environments
Get PDFThe performance of zinc-rich epoxy primers containing carbon nanotubes (CNT-ZRPs) on the corrosion protection of carbon steel in simulated concrete pore solutions contaminated with chloride ions was investigated. The research project was divided in two main sections; in the first part of this project, the author studied the influence of zinc content on the corrosion protection mechanism of carbon nanotubes/zinc rich epoxy primers on carbon steel under exposure to a simulated concrete pore solution. Based on the zinc content, three mechanisms of corrosion protection were identified. The CNT-ZRP with 60 wt. % Zn exhibited good barrier protection during the entire immersion period as a result of the highly cross-linked character of the epoxy binder. In contrast, the CNT-ZRP with 70 wt. % Zn afforded short-term sacrificial protection to the metallic substrate followed by intermediate barrier protection. Furthermore, it was found that the presence of CNTs in the coating system with 70 wt. % Zn, enhanced the electrical contact between the zinc particles and the carbon steel surface, allowing to provide sacrificial protection to the steel substrate. In addition, CNTs increased the barrier properties of the coating, suggesting that CNTs blocked micropores and defects in the material, hindering the diffusion of electrolyte throughout the coating. Finally, an extended galvanic protection was provided for the CNT-ZRP with 80 wt. % Zn. Insoluble zinc corrosion products were found inside the material and at the coating surface, as a result of the galvanic protection process and a self-corrosion process of the zinc particles. These mechanisms of corrosion protection were characterized quantitatively by electrochemical techniques such as open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and localized electrochemical impedance spectroscopy (LEIS) and high-resolution techniques such as scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS).
In the second part of the research project, the influence of chloride concentration in the simulated concrete pore solution on the corrosion performance of these coating systems was investigated. The corrosion protection mechanisms for the different coating systems were similar to the ones described above, however, the effect of different chloride concentrations in the simulated concrete pore solution was noticeable; it was found that concrete pore environments with low chloride concentration allowed passivation of the carbon steel surface and formation of solid zinc corrosion products. In contrast, simulated concrete pore solutions with high chloride concentration led to breakdown of the passive layer, blister formation, and dissolution of zinc corrosion products previously formed during the sacrificial protection process
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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