Lower Circuit
Mostrando 25-36 de 78 artigos, teses e dissertações.
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25. Repetibilidade da avaliação do grau de dispnéia através de um sistema de cargas resistivas inspiratória em indivíduos normais
Introduction: Studies have shown that the magnitude of externally added inspiratory resistive loads follows a predictable relationship with dyspnea perception, in which the psychological magnitude grows as a power of the added loads. The effect of repeated measures of dyspnea perception using resistive loading system is not clear in literature. Objective: To
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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26. Recovery of tin and copper by recycling of printed circuit boards from obsolete computers
This paper presents the experimental results for the leaching of printed circuit boards (PCB) from obsolete computers for extracting and recovering tin and copper by means of leaching followed by precipitation. Printed circuit boards were dismantled, cut into small pieces, and fed into a cylinder mill. The powder obtained was leached by using the aqueous sol
Brazilian Journal of Chemical Engineering. Publicado em: 2009-12
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27. Low environmental impact bleaching sequences for attaining high brightness level with eucalyptus SPP pulp
The alternatives used for minimizing the usage of chlorine dioxide in bleaching sequences included a hot acid hydrolysis (Ahot) stage, the use of hot chlorine dioxide (Dhot) and ozone stages at medium consistency and high consistency (Zmc and Zhc), in addition to stages with atmospheric hydrogen peroxide (P) and pressurized hydrogen peroxide (PO). The result
Brazilian Journal of Chemical Engineering. Publicado em: 2009-03
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28. Preparação e caracterização estrutural e elétrica de cristais mistos de K1-x(NH4)xH2PO4
The preparation and structural and electrical characterization of KH2PO4 (KDP), (NH4)H2PO4 (ADP) and K1-x(NH4)xH2PO4 (KADPx) mixed crystals grown by the method of solvent evaporation at 40 C and with x = 0, 0.076, 0.118, 0.357, 0.857, 0.942, 1.0 was carried out. Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES) was performed in order to deter
Publicado em: 2009
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29. O uso do boné em crianças durante a corrida de intensidade auto regulada sob o sol diminui a temperatura média da cabeça, mas não influencia a velocidade da corrida
The aim of this study was to test the hypothesis that the use of the cap could be a barrier to sun radiation, allowing less heat storage during the self paced race of 6 km under sunlight. Nineteen children of both sexes, inhabitants of tropical region, healthy and able to practice physical exercise (10.3 ± 0.7 and 10.2 ± 1.0 years old, 148 ± 6 and 145 ±
Publicado em: 2009
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30. Frequency synthesizers of 2.4 GHz from CMOS with 0.35 µm for ZigBee applications. / Sintetizador de freqüências de 2,4 GHz em CMOS, 0,35 µm para aplicações em ZigBee.
Frequency Synthesizers are circuits that generate pre-determined frequencies, used in both radio frequency reception and transmission. The Synthesizer circuits are composed by several blocks, such as Voltage-Controlled Oscillator (VCO), Prescaler, PFD (Phase/Frequency Detector), Charge Pump (CP), and Low Pass Filters (LPF). In 2003, an Integer-N architecture
Publicado em: 2008
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31. Alterações plasmáticas do cobre e do zinco em crianças submetidas a cirurgia cardíaca com circulação extracorpórea
The cardiac surgery, comprising extracorporeal circulation, is known to trigger oxidative stress due to the formation of reactive oxygen species and free radicals during the periods of ischemia and reperfusion. They are hazardous to the heart cell components and regarded as responsible for the myocardial stunned. These processes are intricately associated wi
Publicado em: 2008
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32. WC-CoCr coatings sprayed by high velocity oxygen-fuel (HVOF) flame on AA7050 aluminum alloy: electrochemical behavior in 3.5% NaCl solution
In the present work, the electrochemical behavior of WC-CoCr coatings with 10 (W10), 15 (W15) and 20 (W20) torch passes sprayed by High Velocity Oxygen-Fuel (HVOF) flame on AA7050 aluminum alloy substrate, evaluated in 3.5% NaCl solution, were compared using open-circuit potential (E OC) measurements, electrochemical impedance spectroscopy (EIS) and polariza
Materials Research. Publicado em: 2007-12
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33. Mapeamento paramétrico da soldagem GMAW com arames de aço inoxidável ferrítico e austenítico
The use of stabilized ferritic stainless steel wires for GWAW welding in the industry has been increasing in the last years, replacing austenitic stainless steel wires for the welding of stabilized ferritic stainless steel. Besides its lower costs, the ferrític stainless steel weld present a similar, or even superior quality compared to austenitic welds. Co
Publicado em: 2007
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34. Tratamento anaeróbio de efluentes de máquina de papel por biorreator convencional e biorreator de membranas / Anaerobic treatment of paper machine effluents by conventional bioreactor and membrane bioreactor
Fresh water use in paper mills varies according to the type of paper produced, but it can be as high as 100 m3 per ton of paper. In order to reduce water use in paper mills, the reclamation of whitewater is an attractive option. However, it is not always possible to completely recover the whitewater in a closed-cycle manner due to the poor quality of this st
Publicado em: 2007
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35. Efeitos de diferentes intensidades de exercÃcio resistido sobre as respostas hemodinÃmicas em indivÃduos diabÃticos tipo 2 e nÃo diabÃticos
Physical exercise, when prescribed in a proper intensity, is very important in the prevention and/or non pharmacological treatment of high blood pressure, which is common among type-2 diabetics (D). The decrease in blood pressure (BP) after exercise, below pre-exercise rest values, known as post-exercise hypotension (PEH), has been verified after both aerobi
Publicado em: 2006
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36. Rota de processo para o underflow da deslamagem de minério de ferro do concentrador da Samarco Mineração
The iron ore reverse cationic flotation process, using etheramine as a collector/frothing and corn starch as a depressor, is very important in all major Brazilian pellet-feed concentration plants. One of the major challenges found by these plants is the metallic recovery increase, whose main factor is the reduction of iron minerals loss on the froth or true
Publicado em: 2006