Annuli
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. SECONDARY FLOW IN PARTIALLY-OBSTRUCTED ANNULAR SPACE WITH INNER CYLINDER ROTATION / ESCOAMENTO SECUNDÁRIO EM UM ANULAR PARCIALMENTE OBSTRUÍDO COM ROTAÇÃO DO CILINDRO INTERNO
The flow inside a horizontal annulus due to the inner cylinder rotation is studied. The bottom of the annular space is partially blocked by a plate parallel to the axis of rotation, thereby destroying the circumferential symmetry of the annular space geometry. This flow configuration is found in the drilling process of horizontal petroleum wells, where a bed
Publicado em: 2004
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14. Age and growth of Hypophthalmus edentatus (Spix), (Siluriformes, Hypophthalmidae) in the Itaipu Reservoir, Paraná, Brazil
Age and growth of Hypophthalmus edentatus (Spix, 1829) (Siluriformes, Hypophthalmidae) was determined. Data were collected from December 1983 to November 1984 and from April 1997 to March 1998 in the Itaipu Reservoir. To evaluate reading consistency, it was analyzed the coefficient of variation of the total length for each annulus observed in the otoliths. T
Revista Brasileira de Zoologia. Publicado em: 2003-06
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15. A numerical solution for the entrance region of non-newtonian flow in annuli
Continuity and momentum equations applied to the entrance region of an axial, incompressible, isothermal, laminar and steady flow of a power-law fluid in a concentric annulus, were solved by a finite difference implicit method. The Newtonian case was solved used for validation of the method and then compared to reported results. For the non-Newtonian case a
Brazilian Journal of Chemical Engineering. Publicado em: 2003-06
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16. Comparison between one-dimensional uncoupled and convection-conduction conjugated approaches in finned surface heat transfer
This work studies the forced convection problem in internal flow between concentric annular ducts, with radial fins at the internal tube surface. The finned surface heat transfer is analyzed by two different approaches. In the first one, it is assumed one-dimensional heat conduction along the internal tube wall and fins, with the convection heat transfer coe
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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17. Flows in annuli systems: velocity maps / Escoamentos em sistemas anulares : o mapas de velocidades
O presente trabalho é um estudo sobre os escoamentos anulares, onde se destacam os mapas de velocidades para os sistema excêntricos. Estes mapas foram obtidos através de: (i) algoritmos que foram desenvolvidos utilizando as soluções de Snyder 8c Goldstein (1965) para o regime laminar e (ii) da técnica da inversa:o geométrica como apresentada por Ozgen
Publicado em: 1994
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18. Proposed mechanism for generation and localization of new cell division sites during the division cycle of Escherichia coli.
The earliest detectable event at future sites of cell division in Escherichia coli is the appearance of paired periseptal annuli that flank the site of formation of the division septum. The development and localization of these structures were followed as the cell progressed through the division cycle. The data suggest that (i) new periseptal annuli are gene
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19. The periseptal annulus: An organelle associated with cell division in Gram-negative bacteria
Evidence is presented that the site of cell division in Salmonella typhimurium is flanked by two circumferential zones of cell envelope differentiation, the periseptal annuli, which separate the division site from the remainder of the cell envelope. Each annulus is composed of a continuous structure in which the membranous elements of the cell envelope are c
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20. Visual evoked potentials: evidence for lateral interactions.
Electrical potentials evoked in the human brain by visual stimulation can easily be recorded by using electrodes attached to the scalp. It is difficult, however, to relate these visual evoked potentials (VEPs) to specific neural processes: scalp electrodes, far removed from the brain, sum potentials from large areas of cortex. We improved identification and
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21. Traumatic disruption of the fibrous skeleton of the heart, with injury of the tricuspid and mitral valves, aortic annulus, and ventricular septum
In an automobile accident, a young man sustained blunt trauma to the chest that caused injury to the fibrous skeleton of the heart. The mitral and tricuspid valves and their annuli were lacerated, the aortic annulus was separated from the ventricular septum, and the ventricular septum was disrupted; however, with surgical management, the patient survived.
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22. Visual cortical input alters spatial tuning in monkey lateral geniculate nucleus cells.
The response of monkey lateral geniculate nucleus (l.g.n.) cells to flashing spots, annuli, and drifting sine-wave gratings were recorded with tungsten micro-electrodes. These stimuli were presented (a) monocularly, through an aperture in the centre of a radial grating, or (b) dichoptically, in which the spots or drifting gratings were presented to the domin
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23. The structure of the chromatin core particle in solution.
The shape and size of the nucleosomal core particle from chromatin has been examined by analysis of neutron and X-ray scattering data from dilute solutions. Calculations of scattering for many different models have been made and only one model was able to account for both the X-ray and neutron profiles. This model is an oblate structure with height about 50A
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24. Involvement of small-field horizontal cells in feedback effects on green cones of turtle retina.
Light stimuli depolarize green cones of turtle retina through a circuit involving a feedback connection from luminosity horizontal cells (L-HC) to green cones. In turtle retina two types of L-HC have been distinguished: large-field L-HC and small-field L-HC. The spatial properties of the feedback depolarizations of green cones were compared with those of bot