Voltage Elevation
Mostrando 1-12 de 115 artigos, teses e dissertações.
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1. Low cost UV-Ozone reactor mounted for treatment of electrode anodes used in P-OLEDs devices
Abstract Low cost UV-Ozone reactor using a high pressure mercury vapor lamp of 80 watts without outer bulb showed good results for treatment of ITO films used as anode electrode in the assembly of P-OLED (polymer-organic light emitting diode) devices. This study revealed 20 minutes as effective treatment time and it was verified also that the effect of UV-Oz
Polímeros. Publicado em: 22/08/2016
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2. Análise metodológica para a conversão de linhas de distribuição de 34,5 KV para 69 KV / Methodological analysis to convert distribution lines from 34,5 kV to 69 kV.
Este trabalho visa apresentar uma análise metodológica para viabilizar a realização da repotenciação, elevando a classe de tensão de linhas de distribuição de 34,5 kV para a classe de subtransmissão de 69 kV. Foi realizado um levantamento de casos de repotenciação de linhas de transmissão, inclusive para a alternativa de elevação da tensão de
Publicado em: 2011
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3. INFLUENCE ANALYSIS OF THE SWITCHING FREQUENCY AND INPUT CURRENT RIPPLE ON THE PFC CONVERTER DESIGN AIMING TO MINIMIZE THE MAGNETIC VOLUME / ANÁLISE DA INFLUÊNCIA DA FREQÜÊNCIA DE COMUTAÇÃO E DA ONDULAÇÃO DA CORRENTE DE ENTRADA NO PROJETO DE CONVERSORES PFC PARA MINIMIZAÇÃO DO VOLUME DE MAGNÉTICOS
This work investigates the relationship among the magnetic volume, switching frequency and input current ripple of a single-phase, 1kW boost based PFC converter with universal input voltage range, complying with the international standards IEC 61000-3-2 and CISPR 22. Such topology is frequently applicable in Telecom power supplies modules, as a part of a Dis
Publicado em: 2006
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4. Eficacia da epinefrina, norepinefrina e angiotensina II ana ressuscitação cardiopulmonar : estudo experimental na fibrilação ventricular
The augmentation of peripheral vascular tone, by using alpha-adrenergic drugs, is vital for elevation of coronary perfusion pressure (CorPP) and for restoration of spontaneous circulation (ROSC) during cardiopulmonary resuscitation (CPR). We studied, comparatively to a placebo group, the efficacy of Epinephrine (the standard alpha-adrenergic drug), Norepinep
Publicado em: 1996
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5. Mechanism underlying corticotropin-releasing hormone (CRH) triggered cytosolic Ca2+ rise in identified rat corticotrophs.
1. The patch-clamp technique was used in conjunction with the fluorescent Ca2+ indicator indo-1 to measure simultaneously cytosolic Ca2+ concentration ([Ca2+]i) and membrane potential in single rat corticotrophs identified with the reverse haemolytic plaque assay. 2. Application of the adrenocorticotropin (ACTH) secretagogue, corticotropin-releasing hormone
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6. Ionic basis of the different action potential configurations of single guinea-pig atrial and ventricular myocytes.
Single myocardial cells were enzymatically dispersed from guinea-pig atria and ventricles. At 25 degrees C, atrial cell action potentials differed significantly from ventricular cell action potentials in duration (atrial = 141 ms, ventricular = 497 ms) and over-shoot (atrial = +36 mV, ventricular = +42 mV). Action potentials of atrial and ventricular cells r
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7. Cholinergic agonists suppress a potassium current in freshly dissociated smooth muscle cells of the toad.
Single micro-electrode voltage-clamp and current-clamp techniques were used to study cholinergic responses in single freshly isolated gastric smooth muscle cells from the toad Bufo marinus. Acetylcholine (ACh) or muscarine caused membrane depolarization, which sometimes gave rise to action potentials and contractions. The agonist-induced depolarization is du
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8. The suppression of Ca(2+)- and voltage-dependent outward K+ current during mAChR activation in rat adrenal chromaffin cells.
1. The mechanism by which muscarine, ionomycin or caffeine results in suppression of Ca(2+)- and voltage-dependent outward current in rat adrenal chromaffin cells was evaluated using both whole-cell voltage clamp and single channel recording. 2. The whole-cell current activated following the elevation of the cytosolic calcium concentration ([Ca2+]i) by musca
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9. Maximal exercise testing in patients with spontaneous angina pectoris associated with transiet ST segment elevation. Risks and electrocardiographic findings.
Six patients with spontaneous angina associated with transient ST segment elevation had a multistate maximal exercise (bicycle) test. In 5 patients, typical electrocardiographic changes were recorded during exercise, namely ST segment elevation often accompanied by an increase in the voltage of the R wave and a widening of the QRS complex. Four of these pati
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10. Coordinate regulation of gonadotropin-releasing hormone neuronal firing patterns by cytosolic calcium and store depletion
Elevation of cytosolic free Ca2+ concentration ([Ca2+]i) in excitable cells often acts as a negative feedback signal on firing of action potentials and the associated voltage-gated Ca2+ influx. Increased [Ca2+]i stimulates Ca2+-sensitive K+ channels (IK-Ca), and this, in turn, hyperpolarizes the cell and inhibits Ca2+ influx. However, in some cells expressin
The National Academy of Sciences.
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11. Activation of calcium current in voltage-clamped rat glomerulosa cells by potassium ions.
1. We examined Ca2+ influx mechanisms using the whole-cell patch-clamp technique in primary cultures of rat glomerulosa cells. 2. Depolarization of the plasma membrane, as studied by a stepwise or ramp depolarization technique, activated low-threshold, transient (T-type) and high-threshold, long-lasting (L-type) voltage-dependent calcium channels (VDCCs). 3.
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12. Activation of protein kinases and inhibition of protein phosphatases play a central role in the regulation of exocytosis in mouse pancreatic beta cells.
The mechanisms that regulate insulin secretion were investigated using capacitance measurements of exocytosis in single beta cells maintained in tissue culture. Exocytosis was stimulated by voltage-clamp depolarizations to activate the voltage-dependent Ca2+ channels that mediate Ca2+ influx into the beta cell. Under basal conditions, the exocytotic response