1,721,027 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
Zur Zuverlässigkeit der Bemessung von biegebeanspruchten Betonbauteilen mit textiler Bewehrung
No full textSlim and light-weight constructions are becoming increasingly important in architecture, due to esthetical reasons. The demand for such constructions can be satisfied by using Textile-Reinforced-Concrete (TRC), where concrete-cover of only a few millimetres is needed. This leads to thin-walled concrete constructions, which still have a high bearing capacity due to the high strength of the textiles, up to 3500 N/mm . In recent years, numerous self-bearing structures, such as facade-panels, as well as bearing elements, such as bridges, have been produced successfully. For the realization of these structures, many costly experimental investigations on the bearing capacity were necessary. For the innovative material Textile-Reinforced-Concrete to become more economic, the costs for testing needs to be reduced. For this reason, design methods have to be established, which are suitable for daily use, but also fulfill the safety standards. Pursuing exactly this goal, this thesis focuses on the following three steps: During the first step, the material properties of the concrete and of the textile reinforcement had to be investigated. For concrete as a construction material, the recommendations of Eurocode 2 could be used. For the textile reinforcement, however, a new standardized experiment had to be developed, which can be applied in the investigation of the material properties and the statistic values. During the experiments, it was confirmed that epoxy impregnated textile reinforcement has a linear-elastic behavior. It was also proved that the breaking stress and the modulus of elasticity have a normal distribution. During the investigation of the breaking stress, it was observed that the specimen length and the number of yarns have an influence on the results, which must be considered in the structural design. In a second step, a concept for the structural design was developed, which is based on a component structural design concept. The material properties of the single components, which were investigated during the first step, are used to calculate the bending capacity, an approach very similar to the procedure used for standard steel reinforced concrete. The comparison of the experimental and the theoretical results shows a very good match. Thirdly, the reliability of the Textile-Reinforced-Concrete elements was determined. The statistic parameters and the structural design concept were used for these probabilistic calculations. During this process, the main design parameters that influence the bending bearing capacity were investigated. Consequently, a general statement about the reliability was made and a design concept proposed. With the design concept and the proposed safety factor, Textile-Reinforced-Concrete elements under bending stress can be planned efficiently with sufficient reliability. An extensive experimental proof of the bearing capacity of each new structure is no longer necessary
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Long-term durability of carbon reinforced concrete
No full textNonmetallic reinforcements made of fiber-reinforced plastic (FRP) become more and more important in the construction industry. The highly innovative material, mostly used in grid or bar form, is characterized by high tensile strength along with high durability. The noncorrosive properties of the reinforcements made of carbon or glass filaments and a polymer matrix enable a significant reduction of the concrete cover compared to conventionally reinforced components. The ongoing developments in FRP reinforcements are impressively demonstrated by the large number of realized projects, including bridges for pedestrians and cyclists as well as road traffic. The long-term durability of tensile strength is of fundamental importance in the design of FRP-reinforced structural components. Since varying materials and resulting characteristics of individual reinforcement products complicate a general derivation of the long-term behavior, neither standardized design approaches nor test methods allowing for a more extensive application of FRP reinforcement are yet available. Therefore, this work focused on the investigation of the long-term durability behavior of carbon FRP (CFRP) grids as well as the development of testing concepts to determine the long-term durability strength of FRP grids.In this work, long-term durability tensile tests in tempered water at up to 60 °C were carried out on carbon-reinforced concrete (CRC) tensile specimens with an epoxy resin-impregnated CFRP reinforcement. Even after test durations of over 12,000 hours, no loss of strength was observed in the subsequent residual capacity tests.Available testing concepts from the literature and the findings of the experimental investigations were used for developing two testing concepts for the determination of the long-term durability strength of FRP after a service life of up to 100 years. The first concept follows the "time-to-failure" concept assuming that failure of the reinforcement occurs as a result of high constant loading, whereby the second concept is based on the "residual capacity" concept, where the residual capacity of the specimen is tested after a specified test duration, provided that no failure occurs due to high constant loading.Finally, reliability analyses were performed on FRP-reinforced one-way slabs. Using the First Order Reliability method (FORM) and "crude" Monte Carlo method, the influence of the time-dependent tensile strength of FRP reinforcements was taken into account and the positive influence on the reliability of FRP reinforced components was evaluated
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