1,720,958 research outputs found
Datasets for the paper 'Observations on the structure of turbulent boundary layers interacting with embedded propeller tip vortices'
No full text Paper to be published in the Journal of Fluid Mechanics. The dataset contains files for fig.2-15</span
Aeroelastic wing performance in high intensity turbulence: integral length scale effects
No full textThe impact of variations in the integral length scale of incoming free-stream turbulence onan aeroelastic NACA0012 wing is investigated using force, moment and PIV measurements. Ata chord-based Reynolds number
Experimental Investigation of Force Transients during Gust Encounters
Full text linkThe small size and low speed of Micro Air Vehicles make them vulnerable to wind gusts such that sustaining controlled flight becomes a challenge in the unsteady environments. A better understanding of the gust flow is crucial to develop models capable of predicting unsteady forcing. Therefore, this study aims to improve understanding of fundamental flow physics behind the unsteady force production during gust encounters. The bulk of the results presented here were obtained experimentally for a flat plate passing through a transverse gust created in a water towing tank and found to have a sine-squared velocity profile. The effects of 4 different parameters, namely angle of attack, gust ratio, effective angle of attack, and aspect ratio, were explored. A wide investigation range was used for each parameter. The forces increased significantly from their steady-state values during the encounter. 2D flowfields showed the formation and shedding of vortices from the leading and trailing edges of the wing. The flow was found to stay nominally two-dimensional until the forces peak. Only thereafter, spanwise variations were observed in the 3D flowfields. The accuracy and limitations of Kussner's model were evaluated by comparing the sine-squared and top-hat transverse gusts (the latter experiments performed by collaborators). The gradients in the transverse velocity profile were found to significantly affect the force response such that sharper gradients cause higher nonlinearities. Kussner's model was found to provide accurate predictions for the sine-squared gust even when the flow is highly nonlinear, whereas it failed to do so for the top-hat gust. A momentum flux-based normalization was proposed and found to scale the responses of different velocity profiles as long as the response can be predicted by Kussner's model. The effect of gust type on the unsteady forcing was examined by comparing the sine-squared transverse and vortex gusts (the latter experiments performed by collaborators). The results showed that both gust encounters result in large transients in the lift. The increase in the lift force and the leading-edge vortex strength for the transverse gust was found to be steeper than the vortex gust. A flowfield-based force prediction method was proposed and found to be effective for low-to-moderate effective angles of attack
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
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