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Dimmable electronic ballast with high power-factor SEPIC preregulator, for multiple tubular fluorescent lamps
(2004-11-29)
An electronic ballast for multiple tubular fluorescent lamps is presented in this paper. The proposed structure features high power-factor, dimming capability, and soft-switching to the semiconductor devices operated in ...
Imageamento GPR e medidas petrofísicas de rochas carbonáticas carstificadas da formação salitre, norte da Bahia
(BrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM GEODINÂMICA E GEOFÍSICA, 2018-07-23)
Three-dimensional distribution of karstic zones and estimated porosity were
obtained in fractured carbonate units of the Salitre Formation (Northern of the Bahia
State) from GPR data and petrophysical. Low-amplitude GPR ...
Observed frequency-independent torque in flagellar bacterial motors optimizes space exploration
(American Physical Society, 2012-12-17)
A surprising feature of many bacterial motors is the apparently conserved form of their torque-frequency relation. Experiments indicate that the torque provided by the bacterial rotary motor is approximately constant over ...
Nonlocal Raman response in Kerr resonators: moving temporal localized structures and bifurcation structure
(American Institute of Physics, 2020)
A ring resonator made of a silica-based optical fiber is a paradigmatic system for the generation of dissipative localized structures or dissipative solitons. We analyze the effect of the non-instantaneous nonlinear response ...
Desvendando oscilações hipocampais através de comodulações
(BrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM NEUROCIÊNCIAS, 2016-04-07)
Spectral analysis of extracellular electrophysiological recordings revealed that the
brain electrical activity is often organized in rhythmic patterns, known as neuronal
oscillations. Recently, it was discovered that ...
A Power-Quality Index to Assess the Impact of Voltage Harmonic Distortions and Unbalance to Three-Phase Induction Motors
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2010)
This paper discusses the need to simultaneously monitor voltage unbalance and harmonic distortions in addition to root-mean-square voltage values. An alternative way to obtain the parameters related to voltage unbalance ...
Single camera time-resolved 3D tomographic reconstruction of a pulsed gas jet
(Springer, 2013-11)
Experimental characterization of micro-jets is challenging because of the small dimensions of the micro-nozzle. In this study, we propose a new technique to visualize the instantaneous 3D structure of a pulsed gas micro-jet. ...
Sistema de determinação da velocidade de fitas transportadoras
(Universidade Tecnológica Federal do ParanáToledoBrasilCurso de Engenharia EletrônicaUTFPR, 2019-06-26)
The control and measurement of speed for agricultural transport equipment have great relevance for a transport capacity monitoring system, allowing to know with precision the total and instantaneous quantity of total product ...
Noncontact AC Voltage Measurements: Error and Noise Analysis
(Institute of Electrical and Electronics Engineers, 2018-08)
A capacitive noncontact ac voltage measurement technique and its feasibility to measure arbitrary waveform signals are analyzed. The method provides self-calibration of the scale factor, an important feature considering ...
Influencia de la velocidad de contracción muscular sobre la estrategia de reclutamiento de unidades motoras durante contracciones isométricas submáximas de fuerza variable, en el bíceps branquial humano
(Universidad de Chile, 2011)
El Sistema Nervioso Central (SNC) es el encargado de controlar la generación
de fuerza y movimiento humano. Esto es realizado mediante la regulación de los
parámetros de Reclutamiento y Frecuencia de Disparo de Unidades ...