88,718 research outputs found
Maria Rivas oral history interview.
No full textOral history interview with Maria Rivas conducted by Daniel U. Sanchez on Feb. 3, 2010, in Lubbock, Tex. Accompanied by 1 finding aid.Maria Rivas, a Texas Technological College alumna, talks about her experiences growing up in Pecos, Tex., and life at Texas Technological College during the mid-1960s. She discusses her views on bilingual education, racial discrimination and Los Tertulianos (Texas Tech's first minority student organization)
Drawing the Line: How African, Caribbean and White British Women Live Out Psychologically Abusive Experiences
No full textThe final, definitive version of this paper has been published in Violence Against Women, 19 (9):1104-32, Sept 2013 by SAGE Publications Ltd, All rights reserved. © The Author(s) 2013.
The online version of this article can be found at: http://vaw.sagepub.com/content/19/9/110
Listening to Landscapes with Usue Ruiz Arana
No full textIn today\u27s episode we have some big words in the title and with Usue Ruiz Arana, a Lecturer in Landscape Architecture at Newcastle University, we are going to revisit some concepts we have talked about very often: What is a soundwalk? How should we use soundwalks? How do we bring this concept to the cities? Is landscape a superior format to portrait
Extra N° 2: Entrevista a Rosendo Ruiz
No full textRosendo Ruiz es un productor, editor, guionista y director de cine sanjuanino radicado en Córdoba, donde se licenció en Cine y Televisión en la Universidad Nacional. Fue invitado por el Ciclo de Cine y Psicoanálisis de la U. N. C. para comentar su película De Caravana (Ruiz, 2010), realizada íntegramente en Córdoba y galardonada con el Premio del Público en el 25° Festival Internacional de Cine de Mar del Plata. En esa oportunidad, conversó con una psicoanalista y con el público, generando un ávido interés por conocer un poco más acerca de su trayectoria y su modo particular de hacer cine. Por ello se realizó esta entrevista en la cual nos transmite, entre otras cosas, el recorrido de su investigación y la experiencia de grabar en los bailes de Carlos “La Mona” Jiménez; también nos cuenta sobre la recepción y las repercusiones del film en los distintos ámbitos donde fue presentado, así como su perspectiva sobre los lazos de hoy. La entrevista puede verse online en: https://www. youtube.com/watch?v=vxUJ4DznmQ8
A Dynamic Subfilter-scale Stress Model for Large Eddy Simulations Based on Physical Flow Scales
No full textWe propose a new definition of the length scale in an eddy-viscosity model for large-eddy simulations (LES). This formulation extends and generalizes a previous proposal [Piomelli, Rouhi and Geurts, Proc. ETMM10, 2014], in which the LES length scale was expressed in terms of the integral length-scale of turbulence determined by the flow characteristics and explicitly decoupled from the simulation grid; this approach was named Integral Length-Scale Approximation (ILSA). As in the original ILSA, the model coefficient was determined by the user, and required to maintain a desired contribution of the unresolved, subfilter scales (SFS) to the global transport. We propose a local formulation (local ILSA) in which the model coefficient is local in space, allowing a precise control over SFS activity as a function of location. This new formulation preserves the properties of the global model; application to channel flow and backward-facing step verifies its features and accuracy
Large-eddy simulation of a separated flow with a sub-filter scale model based on the integral length-scale
No full textA new sub-filter scale model for large-eddy simulations, which uses a length-scale proportional to the integral scale of the turbulence instead of the grid resolution to parametrize the modelled stresses, will be assessed in the prediction of the flow of a boundary-layer over a rough surface, which includes separation and reattachment
Near Wall PIV-Measurements on the Windward Slope of a Hill
No full textThe turbulent flow over periodic hills was measured near to the wall, using planar Particle-Image-Velocimetry (PIV) at high spatial resolution. Our focus is on the near wall turbulence structure on the windward slope of the hill. For large-eddy simulation (LES) we suspect that, if this was not predicted accurately, it affects the prediction of the velocity profiles over the hill crest which in turn will affect the recirculation length downstream of the hill. Regarding the time averaged velocities, we were able to resolve the linear viscous region of the boundary layer. The velocity distribution and also the Reynolds stress does not comply with the law of the wall as it is valid for a turbulent boundary layer at equilibrium
Dinámica de vorticidad en el campo cercano de un chorro con coflujo y sometido a forzado axial
No full textLa estructura de un chorro con coflujo y sometido a forzado axial es estudiada
experimentalmente en e! campo cercano. El flujo es isotermo e incompresible. Las medidas experimentales han consistido en visualizaciones del flujo en planos longitudinales y transversales y medidas simultáneas de dos componentes del vector velocidad, mediante PIV (Particle Image Velocimetry), en una retícula de puntos contenida en un plano longitudinal.
Estas medidas se realizan en dos instalaciones distintas (pero geométricamente similares) y para diversos valores de los números adimensionales de relevancia (Reynolds, Strouhal, amplitud de forzado, etc.).
Las medidas experimentales han permitido clarificar el comportamiento del flujo en el
campo cercano. Los resultados muestran que las configuraciones que toma el flujo no difieren en sus características fundamentales al variar el número de Reynolds. Por ello, se considera aceptable modelar el flujo mediante razonamientos de dinámica de vorticidad no viscosa, simplificando el flujo en estructuras de vorticidad concentrada, en hilos o capas, que se mueven solidariamente al flujo.
Para estudiar los efectos tridimensionales de forma unívoca, se añade al flujo una nueva
perturbación, acimutal, de baja intensidad. Esta perturbación anda las organizaciones
acimutales del flujo a un número de onda prefijado.
En los experimentos se ha observado la aparición, desarrollo e interacciones entre tres estructuras diferentes de vorticidad. Las dos primeras estructuras corresponden al desarrollo de las inestabilidades axial y acimutal del chorro interior, ancladas y amplificadas por las dos excitaciones ortogonales. La tercera estructura tiene una organización inicial similar a la de la
primera (anillos de vorticidad), pero contrarrotatoria. Esta estructura de vorticidad acimutal “negativa” es el resultado de diversos efectos sobre el labio de salida: 1 )la aparición de
velocidades radiales de succión, inducidas por un anillo de vorticidad de la primera estructura, formado previamente; 2)la existencia del flujo exterior; y 3)la posible aparición de zonas de baja velocidad en el chorro interior, a causa del forzado axial al que es sometido. Por tanto, la formación de esta tercera estructura depende fuertemente de las condiciones del forzado axial y
de la corriente exterior. Su aparición o no en el flujo como una estructura de vorticidad
conceiitrada dependerá de dichas condiciones. Ambos casos (los de aparición o no de la
estructura terciaria) han sido estudiados.
La organización del flujo en el campo cercano responde a las interacciones de estas
estructuras. Se muestran las diversas configuraciones geométricas que pueden aparecer, dependiendo de las características dinámicas del flujo y del forzado axial. Estas configuraciones son modeladas mediante razonamientos de dinámica de vorticidad no viscosa. El efecto de los diferentes parámetros del flujo es analizado._________________________________________-
The near fleid structure of axisyrnmetric coflowing jets, subjected to an inner axial forcing, is studied experimentally. The flow presented here is isothermal and incompressible. The experimental measurements consist of flow visualizations along longitudinal and transverse planes of the 1low as well as 2D-PIV (Particle Image Velocimetry) measurements of the
velocity fleld in a diarnetrical plane. Two flow facilities (geornetrically similar) have been used.
Measurements were performed for different flow conditions, involving flow parameters as the Reynolds number, the Strouhal number (based on the axial forcing frequency), axial forcing amplitude, etc.
The experimental results obtained clarify the flow development iii the near fleld. Several
flow configurations liave been disregarded, depending oii the forcing parameters, but it has been shown that they remain unchanged in their fundamental characteristics when varying the Reynolds number. Therefore, an effort has been made in modeling the flow development by using inviscid vortex dynamics arguments, simplifying the flow in filaments of concentrated vorticity that move with the fluid.
lii order to study the three-dimensional geornetry of the flow fleld, an azimuthal perturbation has also been added. This perturbation locks the azimuthal instabilities to a given wavenumber.
The experimental results show the formation, developrnent and interaction of three different vortex structures. The first and second structures correspond to the development of the well known axial and azimuthal instabilities of the inner jet, locked and amplified by the two
perpendicular excitations. The third structure involves azimuthal vorticity, as well as the first one, but with a sign change. It is the result of different effects in the exit hp of the flow, comprising velocity induction by a previously formed structure of the first type, the external
boundary layer, and the incidence of low velocities iii the inner flow due to the forcing.
Therefore, the formation of the third structure is strongly associated to the values of the axial forcing and the outer jet velocity. Thus, depending on the values of such parameters the third structure could appear (or not) as a concentrated vortex structure.
The flow development in the near fleid is controlled by the interaction of these vortex
structures. Depending on the values of the different flow and forcing pararnenter, several
configurations have been shown. These configurations have been observed and explained via inviscid vortex dynamics. The effect of the different parameters has been analyzed
Energy dissipation and flux laws for unsteady turbulence
No full textDirect Numerical Simulations of spatially periodic unsteady turbulence show that the high Reynolds number scalings of the instantaneous energy dissipation rate and interscale energy flux at intermediate wavenumbers are qualitatively different from the well-known cornerstone scalings of equilibrium turbulence where and are time-dependent rms velocity and integral length-scales. Instead, they both scale as where and are length and velocity scales characterizing initial/overall unsteady turbulence conditions
Thiodina camilae Bustamante & Ruiz 2020, sp. nov.
No full textThiodina camilae sp. nov. Figs 9–10, 52–63 Etymology. The specific name honours Camila Cerón M.D., best female friend of the first author for more than 20 years, in recognition of her friendship, support, encouragement and patience. This also alludes to her short stature, like the representatives of this species. Diagnosis. Males and females of T. camilae sp. nov. resemble those of T. minuta (Galiano, 1977), T. perian Bustamante & Ruiz, 2017 and T. tyrioni sp. nov. by the general appearance (carapace yellow with black borders, a pair of brown stripes on the thoracic region, abdomen dorsally as in genus) and small body. Males of T. camilae sp. nov. differ from those of T. minuta and T. perian by the length of the embolus of the palp (360°), longer than the embolus of T. minuta (270°), but shorter than the embolus of T. perian (450°, 1T+90°) and T. tyrioni sp. nov. (480°, 1T+120°) [compare Figs 56 and 58 with Figs 68 and 70, Galiano (1977b: fig. 14) and Bustamante & Ruiz (2017: fig. 26A)]. The females resemble those of T. minuta, T. perian and T. tyrioni sp. nov. by the rounded shape of the spermathecae, but differ by the longer sclerotized portion of the copulatory ducts [compare Figs 62–63 with Figs 74–75, Galiano (1977b: fig. 17) and Bustamante & Ruiz (2017 fig. 26F)]. Description. Male (Holotype, UBC-SEM). Total length 1.84. Carapace length 0.88, width 0.59, height 0.36. AME diameter 0.19. Ocular quadrangle length 0.51. Anterior eye row width 0.56. Posterior eye row width 0.61. Abdomen length 0.96. Chelicera paturon: spine-like setae absent; promargin with one tooth, tricuspid, middle cusp larger than others, retromargin with two teeth, both curved. Excavation of chelicera absent. Leg I: femur 0.42x0.18, patella 0.24, tibia 0.29, metatarsus 0.23, tarsus 0.20; II: fe 0.34, pa 0.19, ti 0.21, mt 0.18, ta 0.17; III: fe 0.32, pa 0.17, ti 0.19, mt 0.19, ta 0.19; IV: fe 0.45, pa 0.20, ti 0.31, mt 0.26, ta 0.21. Leg formula 4123. Leg macrosetae: femur I–IV d1di, p0, r0; patella I–IV 0; tibia I p0, r0, v1r-0-2a-0; II p0, r0, v1r-0-0; III–IV 0; metatarsus I–II p0, r0, v2-2; III p2di, r2di (r0 right), v0; IV p2di, r2di, v0. Palp (Figs 56–59): tibia wider than long, RTA triangular, RvTA rounded (Figs 57, 59), PTA rounded (Fig. 58); embolus simple, fixed to tegulum, arising distally (12:00), with path of 360° before distal coil (Figs 56, 58). Color in alcohol: carapace yellow with black borders, two brown stripes on thoracic region, abdomen dorsum yellow, with three longitudinal dark stripes, sides with one longitudinal dark stripe (five stripes in total), venter yellow, spinnerets yellow. Femur I yellow, patella, tibia and metatarsus dark; other legs yellow (Figs 52–53). Female (Paratype, UBC-SEM). Total length 1.85. Carapace length 0.91, width 0.60, height 0.38. AME diameter 0.21. Ocular quadrangle length 0.53. Anterior eye row width 0.62. Posterior eye row width 0.65. Abdomen length 0.95. Chelicera paturon: promargin with two teeth, distal one bicuspid and curved, other unicuspid and curved, retromargin with one bicuspid and curved tooth. Leg I: femur 0.38x0.16, patella 0.24, tibia 0.26, metatarsus 0.19, tarsus 0.18; II: fe 0.34, pa 0.22, ti 0.20, mt 0.16, ta 0.16; III: fe 0.32, pa 0.18, ti 0.19, mt 0.17, ta 0.18; IV: fe 0.45, pa 0.20, ti 0.28, mt 0.23, ta 0.19. Leg formula 4123. Leg macrosetae: femur I–III d1di, p0, r0; IV d0-1-1, p0, r0; patella I–IV 0; tibia I p0, r0, v2-1r-0 (v2-2-0 right); II p0, r0, v1r-1r-0; III 0; IV p0, r0, v1pdi (v0 right); metatarsus I p0, r0, v2-2; II p0, r0, v1r-2; III p2di, r1di, v0; IV p1di, r2di (r1di right), v0. Epigyne (Figs 60–63): posterior border without lobes, copulatory openings U-shaped and posteriorly placed (Figs 60–61), copulatory ducts projected posteriorly to epigynal border (Figs 62–63). Color in alcohol: as in male, except for legs yellow and carapace lighter (Figs 54–55). Spine variation (one Ƌ, paratype). Femur I p1di; II d0-1-1, p1di; III: p1di; IV d1-1-1; Tibia I v1r-0-2a-1p; II v1r-1r-0; IV v2di; metatarsus II p1di. Type material. Holotype Ƌ: DOMINICAN REPUBLIC: Barahona: Parque Nacional Sierra Martín García, 18.424°N, 71.112°W, 170 m a.s.l., leg. W.P. Maddison, G.B. Edwards, J. Zhang & G. R. S. Ruiz, 21.VII.2009 (UBC-SEM). Paratypes: DOMINICAN REPUBLIC: Barahona: Parque Nacional Sierra Martín García, 18.424°N, 71.112°W, 170 m a.s.l., leg. W.P. Maddison, G.B. Edwards, J. Zhang & G. R. S. Ruiz, 21.VII.2009, 1♀ (UBC-SEM). Pedernales: Pedernales, 17.964°N, 71.652°W), 13 m a.s.l., leg. W. Maddison, G.B. Edwards, J. Zhang, G. R.S. Ruiz & N. Corona, 18.VII.2009, 3♀ (UBC-SEM); E of Pedernales, 17.965°N, 71.635°W, 30 m a.s.l., leg. W.P. Maddison, G.B. Edwards, J. Zhang, G. R. S. Ruiz & N. Corona, 1Ƌ 1♀ (UBC-SEM). Other material examined. DOMINICAN REPUBLIC: Pedernales: E of Pedernales, 17.965°N, 71.635°W, 30 m a.s.l., leg. W.P. Maddison, G.B. Edwards, J. Zhang, G. R. S. Ruiz & N. Corona, 17.VII.2009, 3 imm. (UBC-SEM); near Pedernales, 17.964°N, 71.652°W, 13 m a.s.l., leg. W.P. Maddison, G.B. Edwards, J. Zhang, G. R. S. Ruiz & N. Corona, 18.VII.2009, 3 imm. (UBC-SEM). Distribution. Known only from the type locality, Dominican Republic.Published as part of Bustamante, Abel A. & Ruiz, Gustavo R. S., 2020, New species and records of thiodinines from North and South America (Araneae Salticidae: Salticinae: Thiodinini), pp. 115-140 in Zootaxa 4899 (1) on pages 131-134, DOI: 10.11646/zootaxa.4899.1.6, http://zenodo.org/record/440075
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