1,720,955 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
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
Roll damping to improve the operational limits of existing barge shaped vessels
No full textRoll motion damping has been an important issue since mankind started building ships. Naval architects have always tried to reduce the roll motion as much as possible for comfort, structural strength and operational limits. In this thesis the effects of using ballast water as active or passive roll damping system are investigated. The goal is to improve the motion behavior of barge shaped vessels owned by Boskalis, such as the Taklift 6. These vessels are used extensively on the North Sea. The roll behavior in waves is quite critical for the operational limits, so being able to reduce those motions with a damping system could improve the workability. The North Sea is a region where the most common wave frequency and the eigenfrequency of most barge shaped vessels owned by Boskalis are very close to each other, which may cause severe roll motion even with relative low waves. In this thesis the vessel 'Taklift 6' has been simulated with an active and passive damping system. The time domain simulations have been performed using the software 'OrcaFlex', while the damping system is programmed as an extension to OrcaFlex in the programming language Python. Both the active and passive system show improvement in motion behavior; the spectral density for the roll motion decreases. As a result the operational limits and thus the workability of the vessel can be increased. The increase in operational limits is not very significant though. The increase in operational limit is theoretically interesting, but in reality the improvement is probably not significant enough to make an actual difference in workability. The active system performs only slightly better than the passive system in some simulated cases, and performs worse in other cases. This might be an optimization error as the controller has only been tuned manually. The advantage of an active system would be to be able to compensate for small motions and to be able to respond earlier to vessel motions, but a passive system might be a better fit, as it damps the roll behavior while the complexity of a passive system is simpler compared to an active system and no external power is required. Within the passive system, the motion of the mass could be limited by using air valves on top of each tank to create a semi-passive system. The semi-passive system is not researched within this thesis report. Further model tests should be performed to test the best setup for a damping system. The location and space required might be an issue on some vessels and the effect of different location for the damping system should be researched. Overall a damping system can give a reduction for the roll motion of barge shaped vessels, but the inprovement in operational limts is not significant. Further research into the design and costs aspects is required to make a decision whether a damping system would be beneficial to use in barge shaped vessels. The damping controller should also be improved to optimize the damping behavior and include sloshing effects in the simulations.Floating offshore structuresOffshore and Dredging EngineeringMechanical, Maritime and Materials Engineerin
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
Sustainability in Inland Shipping: The use of LNG as Marine Fuel
No full textLNG has the potential to reduce echaust gas emissions from vessels. The report explains the basics of LNG: what is it, what are the technical challenges of using LNG as marine fuel, which infrastructure is needed to bunker it and what is the impact on the costs. The report concludes with some measures to assure the succesful adoption of LNG as a marine fuel.Mechanical, Maritime and Materials Engineerin
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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