Hydraulic Pumps
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Análise das condições operacionais de bombas hidráulicas de fluxo radial de grande porte. / Principal hydraulic phenomena in high loaded radial flow hydraulic pumps.
This work presents theoretical and experimental data on the principal hydraulic phenomena responsible for damage in high loaded radial flow hydraulic pumps. The main objective is to provide a technical overview in order to contribute for the analysis and solution on these cavitation pumping systems problems. In addition this work intends to transmit practica
Publicado em: 2006
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14. Proposição de uma metodologia para avaliação de inversores de freqüência em estações elevatórias de água: estudo de casos no sistema de abastecimento de água de São José dos Campos. / Proposal of methodology to evaluation of variable frequency drives in water pumping stations: case study in water supply system in the city of São José dos Campos.
The main purpose of this work is to evaluate the application of Variable Frequency Drives ? VFD, carried out in water pumping stations managed by SABESP ? Companhia de Saneamento Básico do Estado de São Paulo, located in the city of Sâo José dos Campos that are monitored by the Operational Control Center ? O.C.C. Technical characteristics of four pumping
Publicado em: 2006
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15. Formation of soluble microbial products (SMP) in anaerobic reactors during stress conditions
Anaerobic wastewater treatment has many advantages over aerobic treatment, however, one factor that limits its application is the relatively high concentration of organic material in the effluent. Characterization of both aerobic and anaerobic effluents has shown that the majority of the residual chemical oxygen demand (COD) is due to soluble microbial produ
Publicado em: 2004
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16. Simulação computacional de eventos termo-hidraulicos transitorios em multicircuitos com multibombas
PANTERA-2 (from Programa para Análise Termo-hidráulica de Reatores a ÁguaProgram for Thermal-hydraulic Analysis of Water Reactors, Version 2), whose fundamentals are described in this work, is intended to carry out rod bundle subchannel analysis in conjunction with multiloop simulation. It solves simultaneously the conservation equations of mass, axial an
Publicado em: 2003
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17. Detecção de vazamentos em tubulações atraves da analise espectral de transientes de pressão
The development and test of a technique for leak detection in pipelines is presented. The technique is based on the spectral analysis of pressure signals measured in pipeline sections where the formation of stationary waves is favoured, allowing leakage detection during the start stop of pumps. Experimental tests were performed in a 1250 m long pipeline for
Publicado em: 2002
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18. Modelo hibrido para o estabelecimento de rotações otimas de bombas de rotação variavel
Computational simulations are, nowadays, tools that are present in the analysis process of hydraulic networks. The present dissertation brings the development of a computational model, to simulate, in extensive period, water supply systems operating with variable pumps speed, aiming at the optimum speeds of rotation that satisfy pre determined purposes, in t
Publicado em: 2002
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19. Desenvolvimento de equipamento para avaliação de erosão por cavitação
Cavitation in hydraulic structures is particularly important and especially the superficial areas must be resistant. In many cases the provoked damage is so great that it reduces the useful life of the structure and also compels long periods of functioning interruption. The erosion provoked for this phenomenon comes followed of other undesirable effect, such
Publicado em: 2002
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20. A atividade de inovação em uma organização produtiva cubana : um estudo de caso
This dissertation describes the innovation activity of a factory in the Cuban territory nowadays, taking into account the specific determinants of this process in the particular case of a country that still has strong features of a planned economy but is introducing elements of market relationships. The analysis is undertaken by a case study of the Water Pum
Publicado em: 1999
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21. Otimização da operação de sistemas de distribuição de agua abastecidos por bombeamento e reservatorios de regularização
In the present work it was developed an optimization model to water distribution systems operation, supplied by multiple pump stations and multiple reservoirs regulation. The difficulties to reach an appropriate modelling and the excessive simplification of the models have been delaying the appearance of practical solutions more adapted to dimensioning and o
Publicado em: 1999
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22. Biomechanics of the movable pretarsal adhesive organ in ants and bees
Hymenoptera attach to smooth surfaces with a flexible pad, the arolium, between the claws. Here we investigate its movement in Asian weaver ants (Oecophylla smaragdina) and honeybees (Apis mellifera). When ants run upside down on a smooth surface, the arolium is unfolded and folded back with each step. Its extension is strictly coupled with the retr
The National Academy of Sciences.
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23. Presence and Persistence of Legionella spp. in Groundwater
Groundwater samples (111) from six different boreholes located in two geographical areas were examined for the presence of legionellae over a 7-year period. The number of Legionella isolates detected was generally low. The colonization of the aquifers was not uniform, and the persistence of Legionella was independent of the hydraulic pumps and the plumbing s
American Society for Microbiology.
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24. Extraplacental transfer of water in the sheep.
1. Ten pregnant ewes were operated on at 130 days of gestation. The fetal trachea was intubated with a double-lumen tube, an inflatable occluder was placed around the umbilical cord, vascular catheters were placed in the fetal carotid artery and jugular vein and in the maternal jugular vein, and multiple catheters were placed in the amniotic and allantoic sa