1. Contributions of the High Frequency Dynamic Wire Feeding in the GTAW Process for Increased Robustness

Abstract: The GTAW process is recognized as a process of high metallurgical quality, being widely used in the pipelines welding, mainly in the root pass. The relative independence between the heat delivered to the melting pool and the amount of material added helps to control the melting of the material and to avoid the appearance of welding discontinuities

Soldag. insp.. Publicado em: 02/12/2019

2. Obtaining an Optical Trap Type Surface by Plasma Electrolytic Oxidation

High performance solar collectors are those with high selectivity surfaces, high solar radiation absorption and that do not thermally reemit to the external environment. Strategies to enhance this performance might involve surface porosity modification. In this work, a plasma treatment technique called plasma electrolytic oxidation (PEO) has been tested to p

Mat. Res.. Publicado em: 01/03/2018

3. Low cost system to measure active power in electrosurgical units

Abstract Introduction: The real-time measurement of active power delivered to patients during the electrosurgical act is still an engineering challenge. Besides, there is no electrosurgical unit on the market capable of doing it according to the normative requirement. Methods This work presents the design of an electronic structure capable to probe the ele

Res. Biomed. Eng.. Publicado em: 09/11/2017

4. Construction and measurement of an electromagnetic noise generator based on an automotive coil

This article covers the design of an electromagnetic noise generator which uses an automotive coil as the main component. A short theoretical analysis covers the generation of high voltage pulsed current from the available DC source originated from the battery. An electronic dimmer, a circuit used to control the brightness of a light, by controlling the effe

Rev. Bras. Ensino Fís.. Publicado em: 22/06/2017

5. Relationship between peak and mean amplitudes of the stimulating output voltage for functional control of the knee by spinal cord patients and healthy volunteers

INTRODUCTION: Functional electrical stimulation (FES) may evoke movements in people with movement impairments due to neurological lesion. The mean value of electrical current or voltage during FES depends on the stimulatory profile parameters. To investigate the relationship between peak and mean amplitudes of the stimulator output voltage while causing a kn

Rev. Bras. Eng. Bioméd.. Publicado em: 2013-06

6. MODELAGEM E CONTROLE DE UM REATOR ELETRÔNICO PARA LÂMPADAS HPS BASEADO NA CONEXÃO DIFERENCIAL DE CONVERSORES CC / MODELING AND CONTROL OF AN ELECTRONIC BALLAST FOR HPS LAMPS BASED ON DIFFERENTIAL CONNECTION OF DC CONVERTERS

This paper presents the development of an electronic ballast for high intensity discharge lamps, using the differential connection technique applied to Flyback converters. The power factor correction stage was implemented by a Buck-Boost converter operating in discontinuous conduction mode. Subsequently, the integrating converters technique was used to simpl

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012

7. ESTUDO, MODELAGEM E CONTROLE DE UMA MICRO CENTRAL HIDRELÉTRICA COM UTILIZAÇÃO DE GERADOR DE INDUÇÃO AUTO-EXCITADO / STUDY, MODELING AND CONTROL OF MICRO HYDROELECTRIC POWER GENERATION STATION WITH INDUCTION GENERATOR

Na última década houve um aumento significativo no interesse em tecnologias aplicáveis a microgeração de energia elétrica. Fontes de geração de energia hidráulicas, eólicas e solares representam algumas das tecnologias que tiveram importantes evoluções decorrentes dos esforços em pesquisas destinados a esta área de geração de energia. A razã

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/01/2012

8. Controle de Corrente de Spin em Pontos Quânticos na Presença de Tensões de Porta Moduladas no Tempo

Since Loss &DiVincenzo proposal to use confined electron spins in quantum dots (QDs) as a building block for qubits in solid state systems, spin-dependent transport in QDs has attracted a lot of attention. The interest for this system increased even further with the recent experimental developments to coherently control (initialization-manipulation-read out)

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2011

9. Aplicabilidad del monitoreo de emisiones del arco eléctrico para el control de calidad en el proceso MAG-S

Ensuring quality in welding is not a trivial task. For this purpose several quality control checks are performed, at the expense, costs and production times are increased. There are several automated welding systems and they are assisted by control systems based on monitoring of welding parameters. However, automated quality monitoring systems are limited an

Soldagem & Inspeção. Publicado em: 2011-12

10. Efeitos inibitÃrios da sertralina no sistema urinÃrio de ratos. / Inhibitory effects of sertraline on rat urinary system.

Sertraline, a drug belonging to the family of selective serotonin reuptake inhibitors, is used in antidepressant therapy, and has good tolerance with low incidence of side effects. Here we have characterized the pharmacological effects of sertraline on the pattern of voiding anesthetized rats, on the renal functional parameters of isolated rat kidney and on

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2010

11. DESENVOLVIMENTO DE METODOLOGIA DO PROJETO DO REATOR ELETRÔNICO AUTO-OSCILANTE COM ENTRADA UNIVERSAL / DEVELOPMENT OF METHODOLOGY OF SELF-OSCILLATING ELECTRONIC BALLAST DESIGN WITH UNIVERSAL INPUT

This work presents the design and analysis of an electronic system with universal input to supply a fluorescent lamp. The system includes a self-oscillating electronic ballast and an additional circuit which allows keeping the nominal lamp power although a variation of the input voltage. The electronic ballast design comprises some steps: resonant filter des

Publicado em: 2010

12. Three cell flying capacitor inverter for dielectric barrier discharge plasma applications

It is reported the design, construction and initial tests of a three cell flying capacitor inverter (TCFCI) in a half-bridge configuration. The device operates at a 200 kHz frequency which leads to a voltage output at 12.5 kHz presenting an acceptable response in an open-loop configuration. These features outdo those reported in the current multilevel conver

Brazilian Journal of Physics. Publicado em: 2009-06