1,089 research outputs found
FIGURE 32 in Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America
No full textFIGURE 32. Leptohyphes ferruginus, larva, abdominal tergites 6–10 (dorsal) [scale bar A].Published as part of Baumgardner, D.E. & Mccafferty, W.P., 2010, Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America, pp. 1-33 in Zootaxa 2360 (1) on page 12, DOI: 10.11646/zootaxa.2360.1.1, http://zenodo.org/record/530501
FIGURES 14–18 in Contributions to the larvae of North American Nixe (Ephemeroptera: Heptageniidae), with the description of N. dorothae sp. nov. from southern Indiana
No full textFIGURES 14–18. Nixe rusticalis: 14, labrum, apical view; 15, maxilla; 16, hindleg; 17, foretarsal claw; 18, robust seta from forefemur.Published as part of Webb, J.M. & Mccafferty, W.P., 2011, Contributions to the larvae of North American Nixe (Ephemeroptera: Heptageniidae), with the description of N. dorothae sp. nov. from southern Indiana, pp. 27-37 in Zootaxa 3065 (1) on page 34, DOI: 10.11646/zootaxa.3065.1.3, http://zenodo.org/record/527997
FIGURES 19–24. 19 in Contributions to the larvae of North American Nixe (Ephemeroptera: Heptageniidae), with the description of N. dorothae sp. nov. from southern Indiana
No full textFIGURES 19–24. 19, Nixe flowersi dorsal habitus (topotype); 20, Nixe lucidipennis dorsal habitus; 21, Nixe inconspicua; 22, Nixe spB; 23, Ecdyonurus simplicioides dorsal habitus; 24, Ecdyonurus simplicioides head capsule.Published as part of Webb, J.M. & Mccafferty, W.P., 2011, Contributions to the larvae of North American Nixe (Ephemeroptera: Heptageniidae), with the description of N. dorothae sp. nov. from southern Indiana, pp. 27-37 in Zootaxa 3065 (1) on page 35, DOI: 10.11646/zootaxa.3065.1.3, http://zenodo.org/record/527997
FIGURES 1–6 in Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America
No full textFIGURES 1–6. Characters of Leptohyphes male adults. 1, mesonotum (dorsal) [scale bar C]. 2, hindwing [A]. 3, mesoclaw [B]. 4, foreclaw [B]. 5, foretibia (ventrolateral) [D]. 6, genitalia (ventral) [E]. Scale bars (mm): A, C, D = 1; B, E = 0.1. aps = anterior parapsidal suture; cp = costal projection; plu = plumidium; pps = posterior parapsidal suture; tis = transverse interscutal suture.Published as part of Baumgardner, D.E. & Mccafferty, W.P., 2010, Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America, pp. 1-33 in Zootaxa 2360 (1) on page 4, DOI: 10.11646/zootaxa.2360.1.1, http://zenodo.org/record/530501
FIGURES 44–51 in Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America
No full textFIGURES 44–51. Characteristics of larval structures of Leptohyphes murdochi. 44, foreleg (dorsal) [scale bar C]. 45, hindleg (dorsal) [E]. 46, hind claw (ventrolaeral) [B]. FIGURES 47–51. Characteristics of larval structures of Leptohyphes musseri. 47, head (anterior) [A]. 48, pro- and mesothorax (dorsal) [A]. 49, foreleg (dorsal) [C]. 50, hindleg [D]. 51, hindclaw (ventrolateral) [F]. Scale bars (mm): A = 0.05; B, F = 0.10; C = 0.40; D, E = 0.50.Published as part of Baumgardner, D.E. & Mccafferty, W.P., 2010, Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America, pp. 1-33 in Zootaxa 2360 (1) on page 18, DOI: 10.11646/zootaxa.2360.1.1, http://zenodo.org/record/530501
FIGURES 21–25. Leptohyphes apache, larval structures. 21 in Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America
No full textFIGURES 21–25. Leptohyphes apache, larval structures. 21, head and prothorax, [scale bar B]. 22, foreleg [D]. 23, hindleg [E]. 24, hind claw (ventro-lateral) [C]. 25, abdominal tergites 7-10 [A]. Scale bars (mm): A, B = 0.05; C = 0.1; D = 0.5; E = 0.4.Published as part of Baumgardner, D.E. & Mccafferty, W.P., 2010, Revision of the genus Leptohyphes Eaton (Ephemeroptera: Leptohyphidae) in North and Central America, pp. 1-33 in Zootaxa 2360 (1) on page 7, DOI: 10.11646/zootaxa.2360.1.1, http://zenodo.org/record/530501
In therapy with avatars
No full textCombating phobias and psychotic disorders using virtual technology: that is what the work of Dr. Willem-Paul Brinkman of the Faculty of Electrical Engineering, Mathematics and Computer Science involves. Of course one does not have any of these disorders oneself – or at least that’s what our reporter also thought
Insects from the Santana Formation, Lower Cretaceous, of Brazil. Bulletin of the AMNH ; no. 195
No full text191 p. : ill. ; 26 cm.Includes bibliographical references and indexes.Introduction / David Grimaldi and John Maisey -- Stratigraphy / John G. Maisey -- Ephemeroptera / W.P. McCafferty -- Odonata / Frank Louis Carle and Dennis C. Wighton -- Dermaptera / Edward J. Popham -- Isoptera / Kumar Krishna -- Homoptera / K.G.A. Hamilton -- Hymenoptera / D. Christopher Darling and Michael J. Sharkey -- Raphidioptera / John D. Oswald -- Diptera / David Grimaldi
Structure and dynamics of turbulent flows over highly permeable walls
No full textHighly porous materials are found in various industrial applications and environmental flows. In previous studies it was found that a turbulent flow along a highly porous wall experiences a higher skin friction as compared to a solid wall with similar surface roughness when the so-called permeability Reynolds number (Re_K) is larger than O(1). The main objective of the present study was to gain understanding of the characteristic structures and auto-generation mechanisms of turbulence for Re_K >> 1. To this purpose the Volume-Averaged Navier-Stokes (VANS) equations were solved in a Direct Numerical Simulation (DNS) of a turbulent flow through a plane channel with an upper solid wall and a lower porous wall at Re_K = 5.91. The DNS results are in good agreement with available Particle Image Velocimetry (PIV) data for the same flow geometry. A linear stochastic estimation technique was used to capture the structure associated with the characteristic ejection event that contributes most to the Reynolds shear stress near the porous wall. This structure is similar to a horseshoe vortex. Contrary to the conventional hairpin vortex found near solid walls, this horseshoe vortex has a significantly higher inclination angle with the wall and its legs are much shorter. The latter is consistent with the observed absence of low and high-speed streaks near highly permeable walls. Next, the auto-generation mechanisms of the horseshoe vortex were studied in another DNS in which the horseshoe vortex was released in the Reynolds-averaged flow field obtained from the former DNS. Two distinct auto-generation mechanisms were observed: (1) the generation of new structures at the upstream end of the horseshoe vortex, which evolve rapidly into a turbulent spot with an arrowhead shape, and (2) the interaction of the horseshoe vortex with spanwise oriented Kelvin-Helmholtz vortex rollers originating from the inflexion point in the mean velocity profile near the porous wall
Direct numerical simulations of drag reduction in turbulent channel flow over bio-inspired herringbone riblet-texture
No full textThe use of drag reducing surface textures is a promising passive method to reduce fuel consumption. Probably most wellknown is the utilisation of shark-skin inspired ridges or riblets parallel to the mean flow. They can reduce drag up to 10%. Recently another bio-inspired texture based on bird flight feather riblets has been proposed. It differs from the standard riblets in two ways. First, the riblets are arranged in a converging/diverging or herringbone pattern. Second, the riblet height or groove depth changes gradually. Drag reductions as high as 20% have been claimed [2]. The objective of the present work is to study the drag reducing properties and mechanisms of this texture. To that purpose Direct Numerical Simulations (DNSs) of turbulent plane channel flow have been performed. Structured roughness has been applied to both walls and several geometric parameters have been varied. Marginal drag reductions on the order of 2.5% and significant drag increases well beyond 100% were found. The latter is attributed to a strong secondary flow that mixes momentum through the whole channel. In future optimization studies we might look for conditions at which secondary motions affect the near-wall cycle of turbulence only
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