Pressure Fluctuations
Mostrando 1-12 de 88 artigos, teses e dissertações.
-
1. SMART MONITORING AND DECISION MAKING FOR REGULATING ANNULUS BOTTOM HOLE PRESSURE WHILE DRILLING OIL WELLS
Abstract Real time measurements and development of sensor technology are research issues associated with robustness and safety during oil well drilling operations, making feasible the diagnosis of problems and the development of a regulatory strategy. The major objective of this paper is to use an experimental plant and also field data, collected from a basi
Braz. J. Chem. Eng.. Publicado em: 2016-12
-
2. Equilibrium and Out-Of-Equilibrium Investigation of Proton Exchange and CuII and ZnII Complexation on Fungal Mycelium (Trametes hirsuta)
This work presents potentiometric investigations of [mycelium/metal ion/water] complex systems and the development of a new model investigating the ion-mycelium-fluid interactions. Since pH is a major parameter in soil ecology exhibiting large fluctuations, we proposed an improved equilibrium and also out-of-equilibrium potentiometric titration method in ord
J. Braz. Chem. Soc.. Publicado em: 2016-01
-
3. Variação da Pressão Arterial na Gestação Segundo o IMC no Início da Gravidez: Uma Coorte Brasileira
Background: The maternal cardiovascular system undergoes progressive adaptations throughout pregnancy, causing blood pressure fluctuations. However, no consensus has been established on its normal variation in uncomplicated pregnancies. Objective: To describe the variation in systolic blood pressure (SBP) and diastolic blood pressure (DBP) levels during pre
Arq. Bras. Cardiol.. Publicado em: 13/02/2015
-
4. Experimental closed system surgical procedures and intraocular pressure fluctuation
PURPOSE: To determine the behavior of intraocular pressure and its relationship with infusion pressure in vitrectomy, phacofragmentation and phacoemulsification surgeries in rabbits.METHODS:Intraocular pressure fluctuation was measured in 24 eyes of 12 rabbits submitted to vitrectomy, phacofragmentation and phacoemulsification procedures (eight eyes per grou
Acta Cir. Bras.. Publicado em: 2014-11
-
5. Endovascular treatment of peripheral arterial injury with covered stents: an experimental study in pigs
OBJECTIVE: To evaluate the feasibility of using endovascular repair to treat penetrating arterial injuries with covered stents. Feasibility was examined according to the circumferential extent of the injury. INTRODUCTION: Surgical trauma often increases the risk of major morbidity and mortality associated with vascular injury, and endovascular repair has man
Clinics. Publicado em: 2011
-
6. Avaliação dos níveis de metaloproteinases da matriz no fluido gengival durante a movimentação dentária ortodôntica / Evaluation of the matrix metalloproteinases levels in the gingival crevicular fluid during orthodontic tooth movement
During orthodontic treatment, the initial response of periodontal tissues to mechanical stress involves several structural and biochemical changes that allow the tooth movement. The matrix metalloproteinases (MMPs) seem to play an important role in maintaining the functional integrity of periodontal extracellular matrix. The aim of this study was to evaluate
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2010
-
7. Estimativa de um índice de estresse hídrico para a cultura da cana-de-açúcar com base na temperatura foliar / Estimating of crop water stress index to sugarcane based on the canopy temperature
The objective of this work was to evaluate the behavior of leaf temperature and transpiration of sugarcane under different matric and meteorological conditions to estimate a crop water stress index (IEHC), which can be applied in irrigation management and estimates of productivity. Because of the need to apply water stress to plants, the experiment was condu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2010
-
8. Avaliação sanitária da presença de doenças e caracterização dos padrões de caça de subsistência do queixada (Tayassu pecari) de vida livre na Amazônia Peruana / Serologic survey of disease and characterization of subsistence hunting patterns of white lipped peccaries (Tayassu pecari) populations in southwestern Amazon.
The peccary (Tayassu pecari) holds an important place in the Amazonian ecosystem. As seed dispersers they have measurable effects on their habitat, partly guiding structure and composition of the vegetation community. Additionally, their socio-economic role is unsurpassed as one of the most important sources of bushmeat for subsistence hunters in the Peruvia
Publicado em: 2010
-
9. Estudo preliminar da fluidodinamica do escoamento gas-solido de um leito fluidizado circulante atraves da analise dos sinais dinamicos de pressão / Preliminary study of gas-solid dynamics in a circulating fluidized bed through pressure fluctuations analysis
Este trabalho apresenta o estudo experimental das flutuações de pressão de um leito fluidizado circulante operando com areia, um sólido tipo B de Geldart, como material particulado. As medidas formam realizadas em diferentes regimes de contato gás-partícula variando desde leito fixo até leito fluidizado rápido através da variação da velocidade sup
Publicado em: 2009
-
10. Variações diurnas da fotossíntese e efeitos do anelamento de ramos sobre a fotossíntese e o metabolismo do carbono em café arábica / Diurnal changes in photosynthesis and effects of branch girdling on photosynthesis and carbon metabolism in arabica coffee
This study was carried out in order to examine (i) the diurnal changes in photosynthesis rates under low atmospheric evaporative demand, and (ii) the relationship between the rate of net photosynthesis (A) and carbon (C) metabolism in experimentally-manipulated branches through girdling. Two experiments were separately conducted and so analyzed. In both expe
Publicado em: 2008
-
11. AvaliaÃÃo ambiental e percepÃÃo dos usuÃrios sobre os efeitos das obras de proteÃÃo de costa nas praias da Casa Caiada (Olinda) e Janga (Paulista)
The coastal zones and special the beaches are dynamical and fragile regions in a continuous change. The high population concentration in these areas results in a pressure increment upon natural resources and increased risk of environmental degradation. The coast of the Sate of Pernambuco, is experiencing coastal erosion that has many times being mitigated wi
Publicado em: 2008
-
12. Identificação e monitoramento do regime fluidodinamico do leito de jorro no recobrimento de particulas / Identify and monitoring of flow regimes spouted bed coating of particles
The coating of particles in spouted has shown sufficiently promising, in view of its potential of applications in several products such as tablets, cosmetics, seeds, fertilizers. However, the works reported in literature had been predominantly based on visual observations, through columns constructed with transparent material, operated the pressure and ambie
Publicado em: 2007