Pressure Reduction Valves
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Efeito da correção cirúrgica nas variáveis do teste cardiopulmonar de exercício em pacientes com insuficiência mitral crônica. / Effect of surgical correction on cardiopulmonary exercise testing in patients with organic mitral regurgitation.
Introduction: Chronic organic Mitral Regurgitation (MR) has a complex physiopathology. The symptoms of heart failure and functional capacity worsening may appear too late, when a left ventricle (LV) contractile dysfunction already exists. The cardiopulmonary exercise testing (CPET) may objectively assess the functional capacity and helps in the medical condu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/05/2012
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2. Modelo de sistema de automação aplicado à setorização de redes de abastecimento hídrico. / Model of a system of automation applied to the sectorization of hydric supplying nets.
A diminuição das perdas hídricas com a redução das pressões de operação das redes de distribuição é um fenômeno conhecido há muito tempo pelas companhias de saneamento e distribuição de água. Entre as técnicas empregadas para esta finalidade, a setorização apresenta-se, atualmente, como um dos instrumentos mais efetivos de melhoria e otimi
Publicado em: 2011
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3. Importance of appropriated sectorization to reduce real water loss in public supply system. / Importância da setorização adequada para combate às perdas reais de água de abastecimento público.
The following study aims to present the effect of pressure reducing in the distribution networks over the water real loss. For development of the studies, were collected field data that allowed to evaluate the distribution systems conditions and build mathematical models for hydraulic simulations. From the hydraulics models, were developed cases for the Wate
Publicado em: 2010
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4. USE OF EXPANDERS FOR GENERATING ELECTRICAL ENERGY IN NATURAL GAS PRESSURE REDUCTION STATIONS / USO DE EXPANSORES PARA GERAÇÃO DE ENERGIA ELÉTRICA EM ESTAÇÕES DE REDUÇÃO DE PRESSÃO DE GÁS NATURAL
The natural gas is compressed to high pressures in order to be transported in the gas pipeline and delivered to the clients at lower pressures, using pressure reduction control valves in an adiabatic process. It can be shown that the same natural gas thermodynamic output state is achieved if the control valves can be substituted by expanders, producing work
Publicado em: 2009
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5. Avaliação do impacto da redução de pressão nas perdas reais em setor de distribuição de água do municipio de Campo Grande MS / Impact of reduction of pressure losses in real sector of water supply of the municipality of Campo Grande MS
The losses in a system of water supply may represent a large percentage of the total water supplied, depending on age, the applied pressure and the deterioration of the system. This paper presents the water losses occurring in water supplies and various control mechanisms available to avoid them. The aim is to correlate the loss of a real system and the same
Publicado em: 2009
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6. Assessment of the pressure: consumption relationship, in areas with the water distributions network controlled by pressure reducing valves (PRVs). Case Study: Metropolitan Region of Sao Paulo. / Avaliação da relação pressão x consumo, em áreas controladas por válvulas redutoras de pressão (VRPs). Estudo de caso: rede de distribuição de água da Região Metropolitana de São Paulo.
O presente trabalho investiga o efeito da redução de pressão em rede de distribuição de água, provocada pela instalação de válvulas redutoras de pressão (VPRs), no consumo médio total medido em ligações de água, localizadas em áreas sob influência daquele equipamento. Foi feito um levantamento no estado da arte em gestão de sistemas de abast
Publicado em: 2007
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7. Effect of glutaraldehyde fixation and valve constraint conditions on porcine aortic valve leaflet coaptation.
In an investigation of the influence of glutaraldehyde fixation pressure and subsequent valve constraint on the coaptive characteristics of porcine aortic valves, 14 valves were examined, eight having been fixed at low pressure (congruent to 1 mm Hg) and six at high pressure (80 mm Hg). The coaptive ratios of the left and right coronary leaflets in the low-p
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8. Double inlet ventricle. Lung biopsy findings and implications for management.
The lung was biopsied in 20 children with double inlet ventricle and pulmonary hypertension aged 2 months to 14 years. Eleven patients had two patent atrioventricular valves, three atresia of the right valve, and six hypoplasia of the left valve. Severe pulmonary arterial medial hypertrophy occurred in the nine children less than 1 year of age. The findings
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9. Aerosol generation by metered-dose inhalers containing dimethyl ether/propane inverse microemulsions
Water soluble compounds were incorporated into metered-dose inhalers (MDIs) by using water-in-propellant lecithin microemulsions, in which dimethyl ether (DME) and propane acted as both continuous phase and propellant. Lecithin, water, and water soluble compounds were added to glass MDI containers, valves were crimped on, and propellants were added using a p
Springer-Verlag.