Magnetic Transducer
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Software for neurosurgery orientation tracked by a 3D spacial transducer. / Software para orientação de neurocirurgia guiada por um transdutor espacial 3D
Neurocirurgia guiada por imagem permite ao neurocirurgião navegar dentro do cérebro do paciente, usando imagens pré-operatórias como orientação, através do uso de sistemas de rastreamento, durante o procedimento cirúrgico. Muitos sistemas desenvolvidos para neurocirurgia guiada por imagem, empregam imagens pré-operatórias para fornecer orientação
Publicado em: 2007
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2. DEVELOPMENT AND CHARACTERIZATION OF A FIELD MAGNETIC TRANSDUCER BASED ON GIANT MAGNETOIMPEDANCE EFFECT / DESENVOLVIMENTO E CARACTERIZAÇÃO DE UM TRANSDUTOR MAGNÉTICO BASEADO NO EFEITO DA MAGNETOIMPEDÂNCIA GIGANTE
In this dissertation, it is proposed the design of a magnetic field to voltage transducer based on the Giant Magnetoimpedance phenomenon (GMI), characterized by an innovative geometric configuration. In order to attain the best near-field sensibility and far-field immunity, the transducer`s sensitive element and electronic circuit were planned and implemente
Publicado em: 2005
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3. Desenvolvimento de um medidor de fase para um sistema de biotelemetria passiva / Development of a phase meter for a passive biotelemetry system
This work describes the development of a phase measurement equipment for use in a passive biotelemetric system, whose system and measurement technique were developed before in the Biotelemetry Laboratory of the UTFPR. Based on a new technique and phase measurement system developed in this work it was possible to implement an equipment to measure the input ph
Publicado em: 2005
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4. A NEW PRINCIPLE FOR ELECTROMAGNETIC CATHETER FLOW METERS*
An electromagnetic catheter flow meter is described in which the magnetic field is generated by two parallel bundles of wire carrying equal currents in opposite directions. The electrodes are fixed centrally to the insulated wire bundles that generate the magnetic field. The flow sensor is flexible, resembling a split catheter. The flow transducer is designe
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5. Comparability and reproducibility of apex cardiogram recorded with six different transducer systems.
A comparison was made in 7 dogs of the results obtained by 6 different apex cardiographic transducers applied before, during, and after controlled infusion of angiotensin and isoprenaline. The electrocardiogram, internal phonocardiogram, aortic and left ventricular pressure using a Telco micromanometer, and apex cardiogram were recorded simultaneously on mag
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6. A Constant-Field Interrupted Resonance System for Percutaneous Electromagnetic Measurement of Blood Flow
A combination of deformable flow probes of negligible lateral dimensions with an electronic circuit capable of providing a prolonged plateau of dB/dt = 0 and of sampling the flow signal at the end of this interval permits electromagnetic measurement of blood flow with a reliable zero base line secured by switching off the magnet. An extracorporeal magnet pro
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7. Deformation twinning in Ni–Mn–Ga micropillars with 10M martensite
The maximum actuation frequency of magnetic shape-memory alloys (MSMAs) significantly increases with decreasing size of the transducer making MSMAs interesting candidates for small scale actuator applications. To study the mechanical properties of Ni–Mn–Ga single crystals on small length scales, two single-domain micropillars with dimensions of 10×15×3
American Institute of Physics.
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8. 31P nuclear magnetic resonance studies of high energy phosphates and pH in human muscle fatigue. Comparison of aerobic and anaerobic exercise.
The goal of these experiments was to investigate the relationship of ATP, phosphocreatine (PCr), inorganic phosphate (Pi), monobasic phosphate (H2PO4-), and pH to human muscle fatigue. Phosphates and pH were measured in adductor pollicis using 31P nuclear magnetic resonance at 2.0 Tesla. The force of muscle contraction was simultaneously measured with a forc