1,720,958 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
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Geological Hazard Assessments for Mexico City and its Surroundings Based on Synthetic Aperture Radar Interferometry (InSAR) Observations
No full textMexico City, located in central Mexico, is one of the largest and most populated urban areas in the world. Due to its geographic location and particular geological conditions, the city and its population has been exposed to geological hazards. On the one hand, the city is exposed to earthquakes due to ongoing seismic activity originated offshore the southern coast of Mexico, mainly along the convergence boundary between the North American and the Cocos plates. On the other hand, the city was built on a highly compressible lacustrine sediment sequence, which has historically produced seismic amplification. Additionally, and triggered by aggressive groundwater extraction, the sedimentary sequence is subjected to differential land subsidence with rates exceeding 350 mm/yr. The city-scale subsidence patterns and rates were investigated since the 1940’s using multiple geodetic techniques, including the more advanced Interferometric Synthetic Aperture Radar (InSAR). However, these studies focused on the city-scale land subsidence and mostly ignored important differential displacements occurring at smaller scales, which cause damage to buildings and infrastructure. In this work, I use InSAR observation to evaluate geological hazards in Mexico City, focusing on smaller-scale signals typically hidden by the first-order subsidence that cause damage to buildings and infrastructure. First, I use InSAR to systematically measure the subsidence rates along the city’s Metro system, and evaluate the differential subsidence by the means of a 1D parameter—velocity gradient. My results yield that gradient values along some of the Metro lines exceed rates of 1x10^(-3) yr^(-1); these segments of high velocity gradients are also known to suffer from damage or malfunctioning, as reported by official and unofficial sources. Second, I use a band-pass filtering method to decompose the city’s InSAR-derived velocity map into maps of long, intermediate, and short wavelength subsidence velocities. In this study, I focus on the intermediate wavelength signal, which reflect shallow subsidence of large buildings and infrastructure facilities, as Metro lines, and can be used for infrastructure monitoring and improving geotechnical zone boundaries. Third, I use InSAR products to study an atypical phenomenon of shallow faulting induced by the September 19th, 2017 Puebla-Morelos earthquake. The induced shallow faults occur in areas that experienced differential subsidence and shallow faulting and, hence, represent a rapid occurrence of a slow faulting process that typically last 10-20 years of slow faulting.</p
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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