Buscar
Mostrando ítems 1-10 de 149
Measurement of unbalanced voltages in three-phase induction motors using acoustic transducers and zero-crossing-weighted energy
(2021-08-23)
In modern industries, transducers and measurement systems have been largely applied for equipment monitoring. In this context, three-phase induction motors (TIMs) are the main focus of predictive maintenance due to their ...
Design and optimization of electromagnetic transducer for aeroelastic energy harvesting
(2019-08-01)
The energy harvesting from oscillations of structures immersed in a moving fluid has received attention from the scientific community in recent years. Particularly, oscillations resulting from dynamically stable non-linear ...
Immune-mediated loss of transgene expression from virally transduced brain cells is irreversible, mediated by IFNγ, perforin, and TNFα, and due to the elimination of transduced cells
(The American Society of Gene & Cell Therapy, 2012-01)
The adaptive immune response to viral vectors reduces vector-mediated transgene expression from the brain. It is unknown, however, whether this loss is caused by functional downregulation of transgene expression or death ...
Estudo da geração de infrassom com diferentes tipos de transdutores
(Universidade Tecnológica Federal do ParanáCuritibaBrasilGraduação em Engenharia de Controle e AutomaçãoUTFPR, 2017-05-22)
A characteristic of infrasound is the induction of vibratory sensation. In this study, the sound pressure level at very low frequencies necessary to produce a vibratory sensation on a person was investigated. For this, ...
Uma contribuição para a medição das componentes de correntes de descargas atmosféricas através de transdutores resistivos
(Universidade Federal de Minas GeraisUFMG, 2007-02-28)
In this work, a system is developed for direct lightning current measurements in instrumented towers. This system uses resistive transducers and allows the measurement of both the impulsive and continuous components of the ...
A high frequency electronic transducer for multiphase flow measurements
(The Brazilian Society of Mechanical Sciences, 1999)
Sistema para medição de distâncias horizontais na água utilizando transdutor ultrassônico
(Universidade Tecnológica Federal do ParanáToledoBrasilCurso de Engenharia EletrônicaUTFPR, 2019-06-28)
This work describes the development of a prototype of a sensor that can be embedded into an amphibious UAV (Unmanned Aerial Vehicle) to detect obstacles that can damage the UAV in case of collision. The system consists on ...
Conversão de energia sonora para energia elétrica utilizando alto-falantes
(Universidade Tecnológica Federal do ParanáCuritibaBrasilCurso de Engenharia ElétricaUTFPR, 2015-11-24)
The electric energy used for any type of conducting generates some work which is not used, for example, sound energy dissipated in mechanical processes. Despite the dissipation of this energy is small, it is possible to ...
Study of a Three Phase Induction Motor Load Fstimation System by Low-Cost Piezoelectric Sensor
(Ieee, 2018-01-01)
Three-phase induction motors (TIMs) play a key role in the industrial scenario. Due to their robustness and efficacy, coupled with increasingly accessible variable frequency control methods, TIMs have been used to drive ...