1,721,026 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
Microstructural evolution during ageing treatment of metastable titanium alloy Ti-17
No full textTitan-basierte Legierungen sind aufgrund ihrer guten mechanischen Eigenschaften wichtige Baustoffe für bestimmte Luft- und Raumfahrtbauteile und Strukturen. Ein hohes Festigkeits-Dichte Verhältnis, gute Kriech- und Dauerfestigkeit zeichnet diese aus. Die near [beta]-Ti-Legierung Ti-17 (Ti-5Al-2Sn-2Zr-4Cr-4Mo) ist wegen ihres Verhaltens bei Festigkeit-, Härtbarkeit-, Zähigkeit- und Kurzzeitfestigkeit besonders attraktiv für die Luft-und Raumfahrtindustrie. Diese Eigenschaften ermöglichen die Anwendungen in Triebwerkskomponenten insbesondere Mantelstromtriebwerk und Scheiben, sowie in Pylonen, die hohen Belastungen und Vibrationen im Temperaturbereich von -40°C bis 300°C ausgesetzt sind.In dieser Arbeit wird die Titanlegierung Ti-17 unterschiedlichen Wärmebehandlungen unterzogen. Die Rekristallisationsglühung, Lösungsglühung, Auslagerung und Doppel-Auslagerung ermöglichen Gefügeänderungen durch die Verwendung von Dilatometrie, Differential Scanning Kalorimetrie (DSC), Härtemessungen, In-Situ/Ex-Situ Diffraktionsexperimente mittels Synchrotron-strahlung sowie Beobachtungen der Licht- und Rasterelektronmikroskopie zu untersuchen.Thermomechanische Behandlungen des Augangsmaterials zeigen keine signifikanten Veränderungen in Härte und in den Ex-Situ Synchrotron Experimenten während der Auslagerung zwischen 350-500°C. Allerdings wird eine Erhöhung der Längenänderung bei Verlängerung der Auslagerungszeit und Erhöhung der Auslagerungstemperatur erkannt. Die Wärmebehandlung bei 950°C für 1 Stunde und anschließender Wasserabkühlung führen zu einem Gefüge mit vollständig rekristallisierten [beta]-Körnern. DSC, Dilatometrie und In-Situ Synchrotron Experimente dieser im [beta]-Gebiet wasserabgeschreckten Proben (BWQ) zeigen metastabile Phasen wie [omega] und [alpha]'', die mit der [beta]-Phase im Temperaturbereich von 300-450°C koexistieren. Durch In-Situ Diffraktometrie Experimente können bestimmt werden, dass die ersten 10-15 Minuten des Auslagerungsprozesses, für die Bildung dieser Phasen bei hohen Heizraten, kritisch sind. Die Auslagerung der wasserabgeschreckten Proben (BWQ) zeigen die maximalen Härtewerte bei 450°C, die mit der Anfangsphase der [alpha]-Teilchen korreliert werden kann.Titanium-based alloys are important structural materials for specific aerospace components and structures due to their high specific strength, good creep and fatigue resistance. Among them near-[beta] Ti alloy, Ti-5Al-2Sn-2Zr-4Cr-4Mo (Ti-17) is attractive for the aerospace industry due to its high strength, hardenability, good toughness and excellent low-cycle fatigue resistance. Such properties, which depend on the microstructure of the alloy allow it to find applications in jet engine components, specifically, in fan and discs, as well as in pylons subjected to high vibration loads and temperature changes between -40°C and 300°C.In this work, a Ti-17 alloy is subjected to different thermal treatments such as recrystallization, annealing, ageing and double ageing in order to investigate its microstructural evolution by dilatometry, differential scanning calorimetry (DSC), hardness, in-situ/ex-situ X-ray synchrotron diffraction and metallography by light optical microscopy (LOM) and field emission gun scanning electron microscopy (FEG-SEM).The thermomechanically processed material in as-received condition does not show significant changes in hardness nor variations of the present phases determined by ex-situ diffraction measurements after different ageing times between 350-500°C. On the other hand, an increment of the volume of the sample is detected when the ageing time and temperature increases. Heat treatment at 950°C for 1 hour and following water cooling shows a microstructure with fully recrystallized [beta] grains.Differential scanning calorimetry, dilatometry and in-situ diffraction of these [beta]-field water-quenched samples (BWQ) reveal metastable phases like [omega] and [alpha]'' coexisting with the [beta]-phase at temperature range of 300-450°C. In-situ diffraction experiments show that the first 10-15min during the isothermal part of ageing process is critical for the formation of potential phases at high heating rates.Ageing of BWQ samples exhibit the maximum hardness values at 450°C which is correlated with early stage of [alpha]-lath formations.<br /
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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