Hydrostatic Test
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. OtimizaÃÃo de poliuretanos para protetores de linhas flexÃveis sujeitos ao desgaste abrasivo / Optimization of Polyurethanes for Protection of Flexible Pipes Subject at Abrasion Wear
n the last year the Petrobras Company gone self sufficiency of Brazil in the production of petroleum, Itâs take great effort to achieve technology in the exploration of deeper oil-well offshore. The extraction of petroleum deeper off-shore is make through flexible pipes that has multi layers of metal materials and polymeric materials, connected semi-submers
Publicado em: 2007
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14. Influência da configuração de bobinagem no comportamento mecânico de cilindros de compósito polimérico / Influence of the stacking sequence of layers on the mechanical behavior of polymeric composite cylinders
This work evaluated experimentally the influence of the stacking sequence of layers symmetrical and asymmetrical on the mechanical behavior of polymeric composite cylinders. For so much, two open-ended cylinders groups were manufactured by filament winding process, which had different stacking sequence related to the laminate midplane, characterizing symmetr
Publicado em: 2006
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15. Fracture assessment of pipelines using constraint designed test specimens: a 3D extension of the J-Q approach. / Avaliação de defeitos em dutos e risers utilizando corpos de prova mecanicamente similares: extensão 3D da metodologia J-Q.
This study describes an extensive set of 3-D analyses conducted on conventional fracture specimens, including pin-load and clamped SE(T) specimens, and axially cracked pipes with varying crack configurations. The primary objective is to examine 3-D effects on the correlation of fracture behavior for the analyzed crack configurations using the J-Q methodology
Publicado em: 2006
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16. Development of alternative methods to the assessment of the creep fracture resistance of polyethylene resins used for the extrusion of water pipes. / Desenvolvimento de métodos alternativos para a avaliação da resistência à fratura por fluência de resinas de polietileno utilizadas para a extrusão de tubos de água.
Polyethylene has been largely used in potable water distribution systems, mainly in service lines. This polymer offers many advantages over its competitors: flexibility, low cost, ease installation and corrosion resistance. Pipes made with high density polyethylene HDPE, the generic designation of the material in the sanitation industry in Brazil fail
Publicado em: 2005
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17. GERENCIAMENTO DA INTEGRIDADE DE EQUIPAMENTOS UTILIZANDO A INSPEÇÃO BASEADA EM RISCO / INTEGRITY MANAGEMENT THROUGH RISK BASED INSPECTION
This dissertation deals with the general concepts of risk and risk based inspection (RBI) and presents a procedure that integrates risk based inspection and fitnessfor- service tools as presented in API 581 and API 579 respectively, to manage the structural integrity of static equipments and piping subjected to a corrosion mechanism. Risk of failure is quant
Publicado em: 2005
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18. Spontaneous changes in arterial blood pressure and renal interstitial hydrostatic pressure in conscious rats.
1. Previous work has demonstrated a positive relationship between experimentally induced changes in arterial pressure (AP) and renal interstitial hydrostatic pressure (RIHP). The purpose of the present study was to test the hypothesis that RIHP is positively correlated with the normal changes in AP that occur spontaneously in conscious rats. 2. Rats were chr
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19. Inactivation of Gram-Negative Bacteria by Lysozyme, Denatured Lysozyme, and Lysozyme-Derived Peptides under High Hydrostatic Pressure
We have studied the inactivation of six gram-negative bacteria (Escherichia coli, Pseudomonas fluorescens, Salmonella enterica serovar Typhimurium, Salmonella enteritidis, Shigella sonnei, and Shigella flexneri) by high hydrostatic pressure treatment in the presence of hen egg-white lysozyme, partially or completely denatured lysozyme, or a synthetic cationi
American Society for Microbiology.
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20. Evaluation of the chondral modeling theory using fe-simulation and numeric shape optimization
The chondral modeling theory proposes that hydrostatic pressure within articular cartilage regulates joint size, shape, and congruence through regional variations in rates of tissue proliferation.The purpose of this study is to develop a computational model using a nonlinear two-dimensional finite element analysis in conjunction with numeric shape optimizati
Blackwell Science Inc.
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21. Cell volume and membrane stretch independently control K+ channel activity
A number of potassium channels including members of the KCNQ family and the Ca2+ activated IK and SK, but not BK, are strongly and reversibly regulated by small changes in cell volume. It has been argued that this general regulation is mediated through sensitivity to changes in membrane stretch. To test this hypothesis we have studied the regulation of KCNQ1
Blackwell Science Inc.
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22. Heparin-binding EGF-like growth factor contributes to reduced glomerular filtration rate during glomerulonephritis in rats
Heparin-binding epidermal growth factor–like growth factor (HB-EGF), a member of the epidermal growth factor (EGF) family, is expressed during inflammatory and pathological conditions. We have cloned the rat HB-EGF and followed the expression of HB-EGF in rat kidneys treated with anti– glomerular basement membrane (anti–GBM) antibody (Ab) to induce glo
American Society for Clinical Investigation.
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23. Arginine feeding modifies cyclosporine nephrotoxicity in rats.
Glycine (G) infusion causes renal vasodilation mediated by nitric oxide (NO). Cyclosporine A (CsA) nephrotoxicity is characterized by preglomerular vasoconstriction and decreased efferent arteriolar tone probably related to reduced NO and angiotensin II, respectively. L-Arginine (ARG) is a precursor to NO. To test the hypothesis that chronic CsA decreases re
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24. Lung injury edema in dogs. Influence of sympathetic ablation.
Increased vascular permeability characterizes lung injury pulmonary edema and renders fluid balance in the injured lung especially sensitive to changes in hydrostatic pressure. Pulmonary edema is often associated with increased sympathetic nervous system activity which can lead to pulmonary venoconstriction. This postcapillary venoconstriction could raise mi