Motor Pump
Mostrando 25-36 de 51 artigos, teses e dissertações.
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25. Condicionamento de potÃncia de uma motobomba em um sistema de bombeamento fotovoltaico atravÃs de um conversor de frequÃncia
Frequency converters (FC), usually applied in industrial applications, are being adopted in practice, to drive photovoltaic pumping systems (PVPS), substituting equipment (inverters), specially designed for that purpose. However, the information available, regarding the operation of FC for applications of that nature is small or almost inexistent. This work
Publicado em: 2004
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26. AVALIAÇÃO DE DESEMPENHO DO ÓLEO DE SOJA COMO COMBUSTÍVEL PARA MOTORES DIESEL / EV ALUA TION OF SOYBEAN OIL PERFORMANCE AS A FUEL FOR DIESEL ENGINES
The renewed interest in energy for biomass is supported by the need for different energy sources and the need to protect the environment. Recently, because of increases in crude oil prices, limited resources of fossil oil and environmental concerns there has been renewed focus on vegetable oils and animal fats to make a biodiesel fuel. What is known as biodi
Publicado em: 2003
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27. Banco de ensaios para pequenas bombas utilizando a turbina Michell-Banki como maquina motora
The installation, operation and analysis of a rig of test perrnitted to check their particular characteristics, as the use of a Turbina Michell-Banki as motor machine and tests with variable rotation. As a result of this research, we have a demonstration of the viability sustain on the national industry on the improvement of little hydraulic machines, supply
Publicado em: 1999
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28. Desenvolvimento e avaliação de uma bomba de calor usada no condicionamento de ar para secagem de alimentos
A heat pump made up of a reciprocating compressor driven by a 1.1 kW electric motor, an air condenser, a dry expansion evaporator, filled with R22 refrigerant fluid and fully instrumented was circuited to a tray dryer. Ambient air was sucked through the evaporator, flowed outside the condenser and was blown into the dryer. The thermodynamic performance of th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/1993
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29. Sodium Channel and Sodium Pump in Normal and Pathological Muscles from Patients with Myotonic Muscular Dystrophy and Lower Motor Neuron Impairment
Two sodium transport systems have been analyzed in this work: the voltage-sensitive sodium channel and the (Na+, K+) ATPase pump. The sodium channel has been studied using a tritiated derivative of tetrodotoxin; the sodium pump has been studied using tritiated ouabain. Properties of interaction of tritiated tetrodotoxin and of tritiated ouabain with their re
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30. Rotary DNA motors.
Many molecular motors move unidirectionally along a DNA strand powered by nucleotide hydrolysis. These motors are multimeric ATPases with more than one hydrolysis site. We present here a model for how these motors generate the requisite force to process along their DNA track. This novel mechanism for force generation is based on a fluctuating electrostatic f
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31. The Newmarket pump: a new suction pump for external negative pressure ventilation.
A new electronically controlled pump has been developed for use with a cuirass in providing external negative pressure ventilation. It is smaller, lighter, and more versatile than currently available pumps and operates on a servo principle. A rotary valve between the pump and the cuirass varies the rate of extraction of air from the cuirass. The pressure wit
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32. Blue Light Activates Potassium-Efflux Channels in Flexor Cells from Samanea saman Motor Organs via Two Mechanisms1
Light-induced leaflet movement of Samanea saman depends on the regulation of membrane transporters in motor cells. Blue light (BL) stimulates leaflet opening by inducing K+ release from the flexor motor cells. To elucidate the mechanism of K+-efflux (KD)-channel regulation by light, flexor motor cell protoplasts were patch-clamped in a cell-attached configur
American Society of Plant Physiologists.
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33. Changes in excitability of human motor axons underlying post-ischaemic fasciculations: evidence for two stable states.
1. We have investigated the origin of post-ischaemic ectopic discharges in human nerve by recording changes in electrical excitability following periods of ischaemia (15-20 min) sufficient to induce spontaneous motor fasciculations. The ulnar nerve was stimulated beneath a pressure cuff on the upper arm, and compound motor action potentials recorded from abd
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34. Distribution and Activity of the Plasma Membrane H+-ATPase in Mimosa pudica L. in Relation to Ionic Fluxes and Leaf Movements.
Plasma membrane H+-ATPase was immunolocalized in several cell types of the sensitive plant Mimosa pudica L., and transmembrane potentials were measured on cortical cells. In comparison with the nonspecialized cortical cells of the petiole or stem, the proton pump was highly expressed in motor cells. These immunological data are in close agreement with electr
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35. Regulation of Na(+)-K+ pump activity in contracting rat muscle.
1. In rat soleus muscle, high frequency electrical stimulation produced a rapid increase in intracellular Na+ (Na+i) content. This was considerably larger in muscles contracting without developing tension than in muscles contracting isometrically. During subsequent rest a net extrusion of Na+ took place at rates which, depending on the frequency and duration
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36. Molecular mechanisms for proton transport in membranes.
Likely mechanisms for proton transport through biomembranes are explored. The fundamental structural element is assumed to be continuous chains of hydrogen bonds formed from the protein side groups, and a molecular example is presented. From studies in ice, such chains are predicted to have low impedance and can function as proton wires. In addition, conform