1,720,955 research outputs found
Hybrid interface tracking method of multi-phase flows, for additive manufacturingand welding applications
No full textInternational audienc
Hydrodynamics of a flexible containment boom
Get PDFDenne masteroppgaven studerer hydrodynamikken til en fleksibel inneslutningsbom. En global modell basert på teori om kabelstrukturer ble utviklet for å estimere deformasjonene til en bomstruktur som møter strøm. Denne globale modellen tar bare hensyn til det horisontale planet. Den bruker kontaktledningsligningen, luftmotstandskraften og stripeteorien for å finne formen strukturen bør ha. For å validere denne modellen ble det utført eksperimenter på en lang fleksibel bom med dypgang. Strukturen ble slept med hastigheter som varierte mellom og , noe som tilsvarer et Reynoldstall som varierte mellom og . Bommen ble festet til vognen i begge ender, og det ble utført tester med ulike festebredder på , og . I tillegg ble det gjennomført en numerisk studie ved hjelp av CFD-beregningsprogrammet OpenFOAM. Simuleringene ble utført med det eksperimentelle oppsettet som inngangsverdier og inkluderte ulike representasjoner av bommens skjørt. En flat plate og tre ulike kurver som vender mot en strøm () med ulike helningsvinkler ble simulert. De numeriske resultatene viser at formen på den nedsenkede membranen har stor innvirkning på den påførte motstandskraften. Derfor må strukturens vertikale dimensjon tas i betraktning i den globale modellen. Ved å inkorporere varierende motstandskoeffisienter langs bommens lengde i den globale modellen, avhengig av kurven og helningsvinkelen, ble det vertikale aspektet til en viss grad tatt hensyn til. En sammenligning mellom denne modellen og den eksperimentelle studien viste at modellen var nøyaktig, men at den kunne trenge en viss utvikling og forbedring.This master's thesis studies the hydrodynamics of a flexible containment boom. A global model using cable structures theory was built to estimate the deformations of a boom structure facing a current. This global model only takes into account the horizontal plane. It uses the catenary equation, the drag force, and the strip theory to find the shape the structure should take. To validate this model, experiments were carried out on a long flexible boom model with a draft. The structure was towed at velocities varying between and corresponding to a Reynolds number varying between and . The boom was attached at both ends to the carriage and tests were carried out with different attachment widths of , , and . In addition, a numerical study was conducted, using the computational fluid dynamics (CFD) solver OpenFOAM. Simulations were performed using the experimental setup as input values and incorporated various representations of the boom's skirt. A flat plate and three different curves facing a current () with various inclination angles were simulated. The numerical results demonstrate that the shape of the submerged membrane significantly influences the applied drag force. Therefore, the vertical dimension of the structure must be considered within the global model. By incorporating varying drag coefficients along the length of the boom in the global model, dependent on the curve and inclination angle, the vertical aspect was taken into account to some extent. A comparison between this model and the experimental study proved that the model was accurate but could need some development and improvement
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
