Hydraulic Radius
Mostrando 1-12 de 13 artigos, teses e dissertações.
-
1. Physical stability of iron ore caves: geomechanical studies of a shallow underground cave in SE Brazil
Abstract Caves hosted in iron formations are attracting considerable interest due to their scientific and environmental value. Some of these caves are located in or near iron ore mine sites, which represent an important source of income to Brazil. However, the Brazilian legislation requires speleological studies that currently have an impact upon ore reserve
REM, Int. Eng. J.. Publicado em: 2019-06
-
2. AvaliaÃÃo de biodigestor tubular na degradaÃÃo anaerÃbia de cama de frango de corte / Evaluation of tubular biodigester in anaerobic degradation with roiler litter
In the twenty-first century, the broiler production has increased in the world and continues increasing due to the high consumption of this meat. The broiler litter is the largest amount of waste generated in poultry production. It is also characterized by its high concentration of organic matter. The broiler production integrated system defines a radius aro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/02/2012
-
3. Metodologia para determinação da perda de carga localizada em emissores não coaxiais integrados a tubos de polietileno / Methodology for Localized head loss determination of non coaxial emitters inserted in polyethylene pipe
The design of a lateral line of trickle irrigation requires an accurate evaluation of head losses in not only the pipe but the emitters as well. A procedure was developed to determine localized head losses within the emitters by the formulation of a mathematical model accounting for the obstruction caused by the insertion point. These localized losses can be
Publicado em: 2008
-
4. INTERAÇÃO FLUIDOS SINTÉTICOS BASE-ÓLEO E BASE-ÁGUA E FOLHELHOS / SHALE-SYNTHETICS OIL AND WATER FLUIDS INTERACTION
A methodology was developed to experimentally obtain the capillary pressure of different fluids in contact with shales and compare these values with analytical results from individual characterization of fluids and shales. Tests were carried out in a diffusion cell, which allows the simulation of in-situ pressure conditions, the evaluation of physical-chemic
Publicado em: 2005
-
5. PRESSURE DROP IN AXIAL FLOW THROUGH ANNULAR REGION WITH INNER CYLINDER ROTATION / QUEDA DE PRESSÃO EM ESCOAMENTO AXIAL ATRAVÉS DE REGIÃO ANULAR COM ROTAÇÃO DO CILINDRO INTERNO
The present work investigated the pressure drop generated by the flow through an annular configuration with rotation of the inner cylinder. The motivation for the work comes from the several industrial application of the configuration, such as chemical reactors, filters and in drilling operations for oil and gas wells. The experimental study was conducted in
Publicado em: 2005
-
6. Glomerular permeability barrier in the rat. Functional assessment by in vitro methods.
The formation of glomerular ultrafiltrate is dependent on the prevailing hemodynamic forces within the glomerular microcirculation and the intrinsic properties of the filtration barrier. However, direct assessment of the permeability barrier is difficult with most available techniques. We used confocal microscopy to image 1-micron thick optical cross-section
-
7. Passive water flows driven across the isolated rabbit ileum by osmotic, hydrostatic and electrical gradients.
Water flows generated by osmotic and hydrostatic pressure and electrical currents were measured in sheets of isolated rabbit ileum at 20 degrees C. Flows across the mucosal and serosal surfaces were monitored continuously by simultaneous measurement of tissue volume change (with an optical lever) and net water flows across one surface of the tissue (with a c
-
8. Hindered diffusion in agarose gels: test of effective medium model.
The diffusivities of uncharged macromolecules in gels (D) are typically lower than in free solution (D infinity), because of a combination of hydrodynamic and steric factors. To examine these factors, we measured D and D infinity for dilute solutions of several fluorescein-labeled macromolecules, using an image-based fluorescence recovery after photobleachin
-
9. Nature of the renal injury following total renal ischemia in man.
The effects of total renal ischemia (TRI) of 15-87 min duration due to suprarenal clamping of the aorta were studied in 15 mannitol-treated patients undergoing abdominal aortic surgery. 15 patients undergoing similar surgery but requiring only infrarenal clamping served as controls. 1-2 h following TRI, GFR was reduced to only 39% of that in controls, 23 +/-
-
10. Functional response of healthy and diseased glomeruli to a large, protein-rich meal.
Differential solute clearances and hormone assays were used to characterize the effect of a large, protein-rich meal (1.5 g/kg) on glomerular function in 12 healthy volunteers (group I) and 12 patients with chronic glomerular disease (group II). Changes from baseline during 3 h after the meal included an elevation of plasma osmolality, progressive urinary co
-
11. Effect of extravascular plasma protein on pressure-flow relations across synovium in anaesthetized rabbits.
1. The effect of extravascular plasma protein on fluid flux through interstitial matrix was investigated in vivo by studying the pressure-flow relation across synovium during intra-articular infusions of protein solutions (usually bovine serum albumin). Synovium is a sheet of non-epithelial cells separated by interstitium-filled gaps, beneath which are fenes
-
12. Angiotensin converting enzyme inhibition ameliorates glomerular filtration of macromolecules and water and lessens glomerular injury in the rat.
The effect of enalapril on glomerular hemodynamics and permselectivity and on subsequent sclerosis was studied in male MWF/Ztm rats which spontaneously develop proteinuria and glomerular structural damage. Untreated group 1 and enalapril-treated group 2 (50 mg/liter, in the drinking water) underwent micropuncture studies after 2 mo of observation. After the