173,923 research outputs found
Two new species of<i>Carcinoplax</i>H. Milne Edwards, 1852, and<i>Pycnoplax</i>Castro, 2007, from the western pacific, and a description of the female of<i>Thyraplax truncata</i>Castro, 2007 (Crustacea, Decapoda, Brachyura, Goneplacidae)
No full textCastro, Peter (2009): Two new species of Carcinoplax H. Milne Edwards, 1852, and Pycnoplax Castro, 2007, from the western Pacific, and a description of the female of Thyraplax truncata Castro, 2007 (Crustacea, Decapoda, Brachyura, Goneplacidae). Zoosystema 31 (4): 949-957, DOI: 10.5252/z2009n4a9, URL: http://www.bioone.org/doi/abs/10.5252/z2009n4a
Thyraplax truncata Castro 2007
No full text<i>Thyraplax truncata</i> Castro, 2007 (Fig. 3) <p> <i>Thyraplax truncata</i> Castro, 2007: 683, figs 25, 26. — Ahyong 2009: 66, fig. 1A-C.</p> <p> MATERIAL EXAMINED. — <b>New Caledonia.</b> EBISCO, stn CP 2498, 24°45.0’S, 159°43.0’E, 367-536 m, 6.X.2005, 1 ♀, 7.2 mm, cw 9.7 mm (MNHN-B30794).</p> <p>REMARKS</p> <p> <i>Thyraplax truncata</i>, was described from five specimens, all males, which were collected from depths of 430- 500 m in New Caledonia and Fiji. Ahyong (2009) subsequently recorded a female from the Kermadec Is., New Zealand. A second female specimen from New Caledonia now permits the description of the female. All characters related to the morphology of the carapace and pereopods (Fig. 3A) agree with those described for the males (Castro 2007: 683, figs 25A, 26). One exception is the dark-brown tip of the cheliped fingers, which extended slightly less in the female than in the five males previously studied.</p> <p>DESCRIPTION OF THE FEMALE</p> <p>Abdomen wide.Telson triangular,slightly wider than long. Somite 3 covers space between P5 coxae and episternites 7, somite 2 only slightly narrower than somite 3, thoracic sternite8not visible.Vulva (Fig.3B) crescent-shaped, extending from edge of anteriorly deflected suture 5/6 to middle portion of thoracic sternite 6; small, triangular sternal vulvar cover on posterior margin of vulva, covering about third of aperture, soft membrane covering rest of aperture.</p>Published as part of <i>Castro, Peter, 2009, Two new species of Carcinoplax H. Milne Edwards, 1852, and Pycnoplax Castro, 2007, from the western Pacific, and a description of the female of Thyraplax truncata Castro, 2007 (Crustacea, Decapoda, Brachyura, Goneplacidae), pp. 949-957 in Zoosystema 31 (4)</i> on pages 956-957, DOI: 10.5252/z2009n4a9, <a href="http://zenodo.org/record/4520584">http://zenodo.org/record/4520584</a>
Huth (Ferdinand Louis) Papers
No full textLetter from H[enr]i Castro to [Ferdinand] Louis Huth regarding a new batch of emigrants and some specific instructions regarding the colony. Signed Hi. Castro on Sept. 17, 1845 in Antwerp
Weakly stratified laminar flow past normal flat plates
No full textNumerical computations of the steady, two-dimensional, incompressible, uniform velocity but stably stratified flow past a normal flat plate (of unit half-width) in a channel are presented. Attention is restricted to cases in which the stratification is weak enough to avoid occurrence of the gravity wave motions familiar in more strongly stratified flows over obstacles. The nature of the flow is explored for channel half-widths, H, in the range 5 [less-than-or-eq, slant] H [less-than-or-eq, slant] 100, for Reynolds numbers, Re, (based on body half-width and the upstream velocity, U) up to 600 and for stratification levels between zero (i.e. neutral flow) and the limit set by the first appearance of waves. The fourth parameter governing the flow is the Schmidt number, Sc, the ratio of the molecular diffusion of the agent providing the stratification to the molecular viscosity. For cases of very large (in the limit, infinite) Sc a novel technique is used, which avoids solving the density equation explicitly. Results are compared with the implications of the asymptotic theory of Chernyshenko & Castro (1996) and with earlier computations of neutral flows over both flat plates and circular cylinders. The qualitative behaviour in the various flow regimes identified by the theory is demonstrated, but it is also shown that in some cases a flow zone additional to those identified by the theory appears and that, in any case, precise agreement would, for most regimes, require very much higher Re and/or H. Some examples of multiple (i.e. non-unique) solutions are shown and we discuss the likelihood of these being genuine, rather than an artefact of the numerical scheme.<br/
The stability of laminar symmetric separated wakes
No full textTime-dependent computations of the two-dimensional incompressible uniform-velocity laminar flow past a normal flat plate (of unit half-width) in a channel are presented. Attention is restricted to cases in which the well-known anti-symmetric (von Kármán-type) vortex shedding is suppressed by the imposition of a symmetry plane on the downstream plate centreline. With a further symmetry plane at the channel's upper boundary, the only two governing parameters in the problem are the channel half-width, H, and the Reynolds number, Re (based on the body half-width and the upstream velocity, U). The former is restricted to the range 3?H?30 and the interest lies in determining the nature of the initial instability which occurs in the separated wake as Re is gradually increased. It is found that for sufficiently large H and at a critical Re, a long-time-scale global (supercritical) instability is initiated, which in its saturated (limit) state takes the form of ‘lumps’ of vorticity being periodically shed from the tail end of the separated bubble. Stability calculations of corresponding mean flow profiles (typical of those found in the separated wake) are undertaken by examining the impulse response of particular profiles via appropriate solution of the Orr–Sommerfeld equation. The results of this analysis extend those available from related published work and are consistent with the behaviour found from the numerical computations. Taken together, all the results suggest that this type of global instability may be generic to many kinds of separated wakes and, indeed, may provide the fundamental explanation for the very low-frequency oscillations often noticed in fully turbulent wake bubbles
[Leis etc.]
No full textPie de imp. tomado de colofón en r. de h. xiiij: "... Fueron Impressas las presentes pragmaticas: enla muy noble villa de Medina del campo. Por pedro de Castro, Acabaronse a veynte r seys dias del mes de Febrero: del año de mil r quinientos y quarenta y cinco años."Sign.: A\p8\s, B\p6\sLetra gótPort. con esc. xil. imperial: "Apud Guillelmum de Millis M
Huth (Ferdinand Louis) Papers
No full textLetter from [Henri] Castro to [Ferdinand] Louis [Huth] regarding his arrival in Antwerp and a new shipment of colonists. Signed H. Castro on April 25, 1845 in Antwerp
Huth (Ferdinand Louis) Papers
No full textLetter from H[enr]i Castro to [Ferdinand] Louis Huth regarding a new batch of emigrants and some specific instructions regarding the colony. Marked "Duplicate". Signed Hi. Castro on Sept. 17, 1845 in Antwerp. Includes a document listing names of colonists under the headings "house[s] built" and "under construction," with several dates listed
Whose "Fault" Is This? Untangling Domain Concepts in Ontology Design Patterns
No full textCertain ontology domain concepts are difficult to model due to the complexity of their definition, the number of roles that they fulfill in the ontology or the different types of relationships they participate in. To assist ontologists in overcoming some of these challenges, a comparative analysis of two Ontology Design Patterns (ODPs) has been carried out. As a result, terminology is introduced to describe the role and certain reusability characteristics of domain concepts in these ODPs. These findings provide a series of implications that make explicit certain modeling decisions that previously were implicit in the ontology modeling field. Our contribution is illustrated with a concrete example of a real world use case scenario that will benefit from the outcome of this study
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