1,723,870 research outputs found
A finite element analysis of the hydrodynamic performance of 3- and 4-Fin surfboard configurations
No full textThis study investigates the hydrodynamic performance of three and four fin surfboard configurations using the CFD/CFX approach. CFD models of three and four fin configurations were setup inside a rectangular domain using CFX meshing. Comparisons of performance were evaluated by analysing both lift and drag coefficients for each fin system as a function of the angle of incidence at various speeds. The 2-equation k-epsilon (k-ε) turbulence model was used as the base for simulations of flow velocities of 3, 5, 7 and 10 m/s. In addition the 7-equation Reynolds stress (RSM) turbulence model was also employed for flow velocities of 10 and 25m/s in order to compare the predictions of the k-ε turbulence model. Results demonstrated that the maximum lift for the three fin configuration occurred at a smaller angle of incidence than for the four fin design. However, the magnitude of maximum lift was the same for both designs under the operating conditions considered in this study. The results from this investigation imply that if a surfer desires a greater degree of manoeuvrability (ideal in regular surfing), then the three fin configuration would be more appropriate in comparison to the four fin configuration. This is because the three fin design is more efficient at generating lift during smaller angles of attack compared to the four fin design. However if stability and speed in the surfboard is preferred (favourable in big wave surfing), then the four fin configuration would be more suitable owing to less lift and drag at smaller incidence angles
Otopheidomeninae Treat 1955
No full textSubfamily Otopheidomeninae Treat, 1955 Otopheidomeninae Treat, 1955: 556, type genus: Otopheidomenis Treat, by original designation.Published as part of Prasad, V., 2011, Redescription Of Adults Of Prasadiseius Cocytes (Prasad, 1970) (Acari: Otopheidomenidae), pp. 165-189 in Acarologia 51 (2) on page 166, DOI: 10.1051/acarologia/20112002, http://zenodo.org/record/540142
FIGURE 7 in Infestation Of Sphingidae (Lepidoptera) By Otopheidomenid Mites In Intertropical Continental Zones And Observation Of A Case Of Heavy Infestation By Prasadiseius Kayosiekeri (Acari: Otopheidomenidae)
No full textFIGURE 7: Large infestation of P. kayosiekeri on the prothorax of Pachylioides resumens (Sphingidae) in low magnification (Guatemala) (many mites were removed for identification).Published as part of Prasad, V., 2013, Infestation Of Sphingidae (Lepidoptera) By Otopheidomenid Mites In Intertropical Continental Zones And Observation Of A Case Of Heavy Infestation By Prasadiseius Kayosiekeri (Acari: Otopheidomenidae), pp. 323-345 in Acarologia 53 (3) on page 327, DOI: 10.1051/acarologia/20132100, http://zenodo.org/record/539246
FIGURE 9 in Infestation Of Sphingidae (Lepidoptera) By Otopheidomenid Mites In Intertropical Continental Zones And Observation Of A Case Of Heavy Infestation By Prasadiseius Kayosiekeri (Acari: Otopheidomenidae)
No full textFIGURE 9: Several Prasadiseius species mites in the left proximal half of the forewing and left wing base-tympanic-first abdominal cavity area (several mites shown within the circle) (low magnification).Published as part of Prasad, V., 2013, Infestation Of Sphingidae (Lepidoptera) By Otopheidomenid Mites In Intertropical Continental Zones And Observation Of A Case Of Heavy Infestation By Prasadiseius Kayosiekeri (Acari: Otopheidomenidae), pp. 323-345 in Acarologia 53 (3) on page 327, DOI: 10.1051/acarologia/20132100, http://zenodo.org/record/539246
Prasadiseius cocytes
No full text<i>Prasadiseius cocytes</i> (Prasad, 1970) <p> <b>(Figs. 1-35)</b></p> <p> <i>Otopheidomenis cocytes</i> Prasad, 1970a: 29. <i>Prasadiseius cocytes</i> (Prasad), Wainstein, 1972: 453.</p>Published as part of <i>Prasad, V., 2011, Redescription Of Adults Of Prasadiseius Cocytes (Prasad, 1970) (Acari: Otopheidomenidae), pp. 165-189 in Acarologia 51 (2)</i> on page 183, DOI: 10.1051/acarologia/20112002, <a href="http://zenodo.org/record/5401424">http://zenodo.org/record/5401424</a>
Prasadiseius Wainstein 1972
No full textGenus <i>Prasadiseius</i> Wainstein, 1972 <p> <i>Prasadiseius</i> Wainstein, 1972: 453, type species: <i>Otopheidomenis pholusis</i> Prasad, by original designation.</p>Published as part of <i>Prasad, V., 2011, Redescription Of Adults Of Prasadiseius Cocytes (Prasad, 1970) (Acari: Otopheidomenidae), pp. 165-189 in Acarologia 51 (2)</i> on page 166, DOI: 10.1051/acarologia/20112002, <a href="http://zenodo.org/record/5401424">http://zenodo.org/record/5401424</a>
FIGURE 15 in Description Of Immature Stages Of Prasadiseius Cocytes (Prasad, 1970) (Acari: Otopheidomenidae)
No full textFIGURE 15: Prasadiseius cocytes (protonymph) — Dorsal view of left lateral idiosoma (ID) showing small left peritreme (PE) and part of left posterolateral podonotal shield (POS) with left posterior podonotal lobe (LPPOL) and s4. Note seta r3 on soft integument well anterior to the tip of peritreme and anterolateral to s4. Some part of left vertical invagination (LVINV) could also be seen (VP10-36-231, 400x).Published as part of Prasad, V., 2012, Description Of Immature Stages Of Prasadiseius Cocytes (Prasad, 1970) (Acari: Otopheidomenidae), pp. 59-86 in Acarologia 52 (1) on page 71, DOI: 10.1051/acarologia/20122033, http://zenodo.org/record/539938
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
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