1,721,004 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
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
EngD in Renewable Energy Marine Structures
Get PDFThe negative effects of anthropogenic climate change has led to an increase in electricity generated from renewable energy sources. Within this, offshore wind is currently one of the fastest growing markets, and industry is now looking towards the role that floating offshore wind turbines (FOWT) may play in the future. However, FOWT are often subjected to increased tower loads, up to 1.6 times those experienced by their fixed-to-seabed counterparts. Reducing these loads would help to decrease the costs of this fledgling technology, by diminishing the tower strengthening requirements.
In the present work, as a possible technological solution to reduce the above mentioned loads, a variable speed, variable pitch-to-stall (VSVP-S) control strategy, is proposed for wind turbines. The 5 MW turbine is applied to both a semi-submersible and a spar floating platform, as these floaters both suffer from increased tower fore-aft oscillations. The VSVP-S control configuration avoids negative damping by design, allowing higher controller gain settings and hence a more regulated power output, than a pitch-to-feather controlled floating scenario. The FOWTs are further altered to incorporate back twisted blades, to decrease the blade bending moment response. This was seen to decrease the
tower fore-aft moment range, creating an increase in the turbine tower life expectancy, when compared to their respective feather base models.
To predict the overall tower axial fatigue life, the frequency of anticipated wind speeds are required. The likely occurrence of the different wind speed cases was accounted for through a weighted analysis. This took account of the distribution of probability of occurrence at three mean turbulent wind speeds: 8, 13 and 18 m/s. FOWT analysis highlighted trends in terms of back twist angle initiation point and magnitude were similar for both VSVP-S models (i.e. semi-submersible and a spar floating platforms). When a back twist angle to -6° at the tip was imposed, starting at 75% along the blade length, increases in the tower axial fatigue life of 10.2% for the semi-submersible and 18.8% for the spar were achieved, with the VSVP-S controlled turbines, compared to their feather controlled counterparts
Monitoring of stress corrosion cracking under representative pipeline conditions.
Get PDFMori, Stefano - Associate SupervisorPipelines are subjected to various stresses during operation, which are induced
from factors including fluid flow, ocean currents, mechanical vibrations, or earth
movements. These stresses, in combination with the corrosive environment can
cause an increase in pipeline’s corrosion rate and, subsequently, lead to stress
corrosion cracking. The presence of trace gases (CO₂, O₂, H₂S), is expected to
have an influence on this susceptibility. As such, the aim of the research is to
access the impact of trace gases linked to CO₂transportation, carbon capture
and storage, enhanced oil recovery and other pipeline operations. This is key to
understanding whether pipelines are at increased risk of failure.
In this research, the stress corrosion behaviour of API 5L X65, X70, X80 and
X100 has been investigated. Tests were conducted in 3.5 % NaCl solution with
either N₂, CO₂, or mixtures of O₂/N₂ and O₂/CO₂ bubbled through. Liquid
temperatures were maintained at either at 5 ˚C, 15 ˚C or 25 ˚C. C-ring and 3-point
bending specimens were stressed at 80 % or 95 % of yield strength. Linear
polarization resistance monitored corrosion rates. Corrosion extent and
morphology were examined by optical microscopy (to measure metal loss),
followed by scanning electron microscopy analysis.
The results from baseline experiment (N₂) showed correlations between
corrosion rates and both stress and temperature. All samples exposed with mixed
O₂/N₂ presented higher corrosion rates by 1 order of magnitude. Their damage
morphology consisted of metal loss and pits features. These pits had deeper,
elliptical morphology in comparison with N₂-only data. Results from the pure CO₂
gas showed more rapid corrosion rates than in pure N₂ and mixed O₂/N₂.
However, with change in trace gas mixture from pure CO₂ to O₂/CO₂, a large
increase in corrosion rates of about 70% was observed. Similar morphologies
were observed on X65, X70 and X80 samples in solution with pure CO₂ and
mixed O₂/CO₂ at all solution temperatures, with a deep undercutting morphology
and discontinuous microcracks being observed. In contrast, X100 showed wide,
deep ellipse-shaped pits.PhD in Energy and Powe
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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