Thermistor
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Wavelength of Experimental LEDS: Hardness, Elastic Modulus, Degree of Conversion and Temperature Rise of a Microhybrid Composite
The aim of this study was to evaluate the effect of different peak wavelengths (450nm, 468nm and 490nm) of experimental LEDs on hardness, elastic modulus, degree of conversion and temperature rise of a microhybrid resin composite – Venus® (Heraeus Kulzer). Hardness and elastic modulus were determined by nanoindentation technique (n=5), degree of conversio
Mat. Res.. Publicado em: 2015-04
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2. Association between the increase in brain temperature and physical performance at different exercise intensities and protocols in a temperate environment
There is evidence that brain temperature (Tbrain) provides a more sensitive index than other core body temperatures in determining physical performance. However, no study has addressed whether the association between performance and increases in Tbrain in a temperate environment is dependent upon exercise intensity, and this was the primary aim of the presen
Braz J Med Biol Res. Publicado em: 08/07/2014
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3. Passive body heating improves sleep patterns in female patients with fibromyalgia
OBJECTIVE: To assess the effect of passive body heating on the sleep patterns of patients with fibromyalgia. METHODS: Six menopausal women diagnosed with fibromyalgia according to the criteria determined by the American College of Rheumatology were included. All women underwent passive immersion in a warm bath at a temperature of 36 ±1 °C for 15 sessions o
Clinics. Publicado em: 2013
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4. Sensor químico baseado em microponte de impedância = : Chemical sensor based on impedance microbridge / Chemical sensor based on impedance microbridge
A integração de sistemas microeletrônicos em lab-on-a-chip está sendo cada vez mais necessária para concretizar novas aplicações dentro do emergente campo da microfluídica. Tanto na química quanto na bioquímica e até mesmo na medicina e bioengenharia, a microfluídica evolui conquistando um espaço crescente. Entretanto, desafios tecnológicos res
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/07/2012
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5. A new technique for interrogating fiber optic sensors with Bragg gratings / Uma nova tecnica para interrogação de sensores a fibra otica com grades de Bragg
The recent advances in fiber optics and eletronic circuits has led to the development of many sensors based on fiber optics, with a great emphasis on Fiber Bragg Gratings (FGB) sensors. The FGBs sensors are used to quantify severeal measurands, as temperature, pressure, tension, thermodynamics and electrical current, with good accuracy and resolution. In thi
Publicado em: 2009
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6. Síntese e caracterização elétrica de materiais com comportamento termistor à base de óxidos de manganês, de níquel e de cobalto / Synthesis and electrical characterization of ceramic thermistors based on manganese, nickel and cobalt oxides
Materiais cerâmicos à base de óxidos de manganês, de níquel e de cobalto foram preparados por meio de mistura de óxidos seguida de homogeneização e sinterização controlada em 1250 °C. Os óxidos foram caracterizados por meio das técnicas de difração de raios X, fluorescência de raios X, termogravimetria e determinação de distribuição de ta
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2007
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7. METODOLOGIA PARA AVALIAÇÃO METROLÓGICA DE CARACTERÍSTICAS DE UM TERMISTOR PTC POLIMÉRICO REGENERATIVO / METHODOLOGY FOR METROLOGICAL EVALUATION OF THE CHARACTERISTICS OF A PTC POLYMERIC RESETTABLE THERMISTOR
This research aims at the development of a methodology for experimentally characterizing a PTC polymeric resettable thermistor LP60-110, used as an overcurrent and over temperature protection device. Uncertainty of measurement of the parameters, such as temperature, voltage, current and ohmic resistance is also determined. The PTC (Positive Temperature Coeff
Publicado em: 2005
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8. Analysis of Sensitivity of Based Anemometers the Constant Temperature in Term Sensor / Análise de Sensibilidade de Anemômetros a Temperatura Constante Baseados em Sensor Termo-resistivo
In this work we present a study on the sensitivity of anemometers based on thermoresistive sensors heated to a constant temperature. The configurations that makes the thermoresistive sensor heated to a constant temperature are composed of a Wheatstone bridge using a feedback operational amplifier. The substitution measurement method is used, where an electri
Publicado em: 2004
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9. Electrical characterization by impedance spectroscopy of Zn7Sb2O12 ceramic
Impedance spectroscopy technique was used to investigate the electric properties of Zn7Sb2O12, an electroceramic with inverse spinel type structure. The electric characterization of the Zn7Sb2O12 semiconducting ceramic was performed at temperature from 250 to 550 °C, in the frequency range from 5 Hz to 13 MHz. Zinc antimoniate phase was synthesized by the p
Materials Research. Publicado em: 2003-06
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10. Desenvolvimento de um medidor de debito cardiaco pelo metodo de termodiluição
The measurement of Cardiac Output is of great 1mportance for the functional evaluation of the clrculatory system. Together w1th other physiological parameters, such as pressure, heart rate, etc, it allows us to establish the circulatory system hemodynam1c working state. As a consequence, it helps on the adequate d1agnosis of the pathologies that affect the c
Publicado em: 1991
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11. Determinação embulioetrica de constantes de equilibrio
Ebulliometric measurements were used for the determination of equilibrium constants by using a twin thermistor ebullioscope. Silver sulfate solutions were studied at the temperature of 371,5 K. One appropriate equation was derived and the solubility product of silver sulfate was determined in boiling and satured solution. Note: the complete abstract is avaia
Publicado em: 1982
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12. Desenvolvimento de um titulador termometrico e sua aplicação na determinação de azotetos insoluveis
With the objective of introducing ourselves to the analytical methods based on the thermal effects which accompany chemical reactions and particularly on the Thermometric Titration technique, the following topics were developed: 1 - We constructed a thermometric titrator which consisted of the following parts: a constant delivery syringe, a Dewar flask, a ti
Publicado em: 1977