Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"thermistor"”.
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A thermistor anemometer for measurement of air velocity
Digitized by Kansas Correctional Industries
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A thermistor anemometer for measurement of air velocity
Digitized by Kansas Correctional Industries
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Hot-thermistor spirometry for the artificial ventilation of infants
… are discussed. A new temperature-compensated hot-thermistor anemometer/spirometer was developed because the wide variety of spirometers described previously for-measuring respiratory volumes •and volume flow rates were unsatisfactory for routine use in monitoring infant ventilation. The principles …
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Katalytische molekular geprägte Polymere : Herstellung und Anwendung in einem Thermistor
… können. In der Enzymtechnologie wird der Enzym-Thermistor für diesen Zweck eingesetzt, da enzymatische Reaktionen eine Enthalpie in einer Größenordnung von 5 – 100 kJ/mol besitzen. In dieser Arbeit wird die Herstellung von katalytisch geprägten Polymeren nach dem Verfahren des Oberflächenprägens …
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Determination of thermal conductivity of food materials using a bead thermistor
… conductivity of food materials using the bead thermistor with particular reference to high temperature. Feasibility was established by examining the effects of the input parameters and the measurement error associated with them on the ability to estimate the test medium thermal conductivity …
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Optical analysis of the ERBE scanning thermistor bolometer radiometer using the Monte Carlo method
… employing nonscanning active cavity and scanning thermistor bolometer radiometers are orbiting the Earth to monitor its radiative emission. A numerical model has been formulated to better understand the performance of the ERBE scanning radiometer and to aid future radiometric design and …
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A numerical study of equivalence in scanning thermistor bolometer radiometers for earth radiation budget applications
… behavior and equivalence of the ERBE scanning thermistor bolometer radiometers. The finite-difference method is applied to the detector of the ERBE scanning radiometer to characterize its thermal and electrical dynamic behavior. The thermal analysis confirms the thermal time constant of the …
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A Thermistor Based Method for Measurement of Thermal Conductivity and Thermal Diffusivity of Moist Food Materials at High Temperatures
… research was to assess the suitability of the thermistor based method for measuring thermal conductivity and diffusivity of moist food materials at high temperatures. Research focused on aspects of calibration, thermal contact in solid food materials, natural convection in liquid media and the …
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A transient heat probe sensor for measuring transpiration in the stem of woody plants.
… plants. This system utilizes a single heated thermistor probe which is alternately and automatically switched between a constant (heating phase) and a variable (cooling phase) temperature mode of operation. Experiments reported here have been carried out in two distinct porous medium, packed …
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An automated probe for thermal conductivity measurements
… The technique employs an encapsulated bead thermistor. A thermistor, more commonly used as a temperature transducer, has the inherent feature of being readily self-heated. A computer-based data acquisition and control system regulates the power supplied to the thermistor such that its …
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A Comparative Analysis of Methods for Baseline Drift Removal in Preterm Infant Respiration Signals
… measurement of infant respiration is the use of thermistors. Accurate event detection within thermistor generated signals relies heavily upon effective noise reduction, specifically baseline drift removal. Baseline drift originates from several sensor-based factors, including thermistor placement …
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Design of a bead holder for thermal atherosclerosis sensor
… run of ten acrylic bead holders, we installed a thermistor in each holder and achieved a satisfactory fit. Moreover, the thermistor was easily oriented into the holder and fit snugly. We must continue the design optimization process to determine the best distance for the thermistor bead to extend …
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The accuracy of miniature bead thermistors in the measurement of upper air temperature
… study was made of the errors of miniature bead thermistors of 5, 10, and 15 mils nominal diameter when used for the measurement of atmospheric temperature. Although the study was primarily concerned with the errors of the thermistors when used in Meteorological rocket soundings between about 70 …
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Design and thermal modeling of a non-invasive probe for measuring perfusion by thermodiffusion
… in real time. This method employs a self-heated thermistor placed in perfused tissue. From a knowledge of the power required to heat the thermistor probe to a given temperature, perfusion can be calculated using an analytical or numerical model. Using Bowman's thermodiffusion probe (designed for …
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Calorimetric Measurements of Heats of Adsorption on Single Crystal Surfaces
… our laboratory. The calorimeter utilizes a bead thermistor to measure the energy released when gas adsorbs on a single-crystal sample. The apparatus is capable of measuring energy releases on the sample as small as 15 to 20 microcalories. This new apparatus has been utilized to measure the heat …
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An experimental and analytical investigation of liquid moisture distribution in roof insulating systems
… fiber insulation. A new technique employing thermistor probes was used to measure thermal conductivity over a range of low moisture contents. The results indicate that the material's thermal conductivity is a strong nonlinear function of the moisture concentration. The sensitivity of the …
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Simulation of a solar water heating system
… mass flow rates were measured using a thermistor inserted into the flow circuit. Close correlation was obtained between predicted and experimental results. Daily efficiencies varied according to the times and quantities of hot water draw offs. The thermal performance of similarly …
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Balloon Borne GPS-Enabled Radiosondes That Enable Simultaneous Multi-Point Atmospheric Sensing With a Single Ground Station
… designed to make mass manufacturing possible. A thermistor-based temperature sensor was developed and tested in a thermal chamber to verify its accuracy, precision, and repeatability between different payloads. The payloads have been launch tested in a variety of locations and during different …
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Dynamic Electrothermal Model of a Sputtered Thermopile Thermal Radiation Detector for Earth Radiation Budget Applications
… radiometers used for CERES consist of thin-film thermistor bolometers viewing the Earth through a Cassegrain telescope. The Thermal Radiation Group, a laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, is currently studying a new sensor …
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A characterization of internal solitons in the SWARM region of the New York bight
… of water near 39°15.34'N, 72°56.59'W with three thermistor strings, a bottom-mounted ADCP, and yo-yo CTDs. These data spanned a two-week period of the month-long study. With the exception of a time following a storm event, during which the generation mechanism near the shelf break was effectively …
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