The aim of this work was to assess the accuracy of thermistors/thermocouples as devices for detecting hypopnoeas in sleep studies. Conventional thermistor/thermocouples were studied with a respiratory model allowing the simulation of inspiratory (22 degrees C) and expiratory (37 degrees C) flows. The thermistor signal (V'th) was compared with a pneumotachograph (V'th): 1) for sinusoidal and squ...

BACKGROUND The lack of patient triggering capability during negative pressure ventilation (NPV) may contribute to poor patient synchrony and induction of upper airway collapse. This study was undertaken to evaluate the performance of a microprocessor based iron lung capable of thermistor triggering. METHODS The effects of NPV with thermistor triggering were studied in four normal subjects and...

Authors' synopsis Simultaneous measurements of the concentration of dye by a fiberoptic catheter and of the temperature by a thermistor catheter were obtained in dogs. No significant diference for cardiac output and stroke uolume was found. The slightly but significant higher residual.fraction by thermodilution than by Jiberoptic technique is caused by cold transfer between irentricular myocard...

A compact electrothermal simulation model for a semiconductor thermistor with positive temperature coeecient (PTC) is presented. The model presented is phenomenological, but it is based on physical models published by Heywang (1961,1964), Mallick and Emtage (1968), and Zhang and Cao (1996). With this dynamic, non-linear electrical-equivalent circuit model, combined electrical and thermal behavi...

Soret coefficients of the ternary system of poly(ethylene oxide) in mixed water/ethanol solvent were measured over a wide solvent composition range by means of thermal diffusion forced Rayleigh scattering. The Soret coefficient S(T) of the polymer was found to change sign as the water content of the solvent increases with the sign change taking place at a water mass fraction of 0.83 at a temper...

Abstract A patient’s respiratory rate is one of the critical vital signs that a determinant patient well-being. However, it all too often neglected or misreported by health care professionals. This study presents design, build and testing low-cost, portable monitor to facilitate accurate reporting rate. The comprised thermistor-based transducer capture breath cycle patients based on temperature...

During the year August 29, 1965, through August 28, 1966, weekly samples of water were taken from Linsley Pond, North Branford, Connecticut, for the purpose of as complete a geochemical survey as possible. At the same time, temperature studies were made at half-meter intervals for the column, from the surface through 14 M, using a YSI thermistor reader and thermistor accurate to at least 0.050C...

Temperature and molecular weight dependence of k o in D(C)=D(O)[1 +CkD], where D(C) is the diffusion coefficient for the density fluctuations in a dilute polymer solution, is investigated by first expressing D(C) as a function of the static structure factor S(q,C) within the framework of the Kirkwood-Riseman theory. The continuous transition of k D from negative values under theta conditions to...

A laboratory 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 km and 30 km altitude the results are also valid for other applications of these thermis...