OBJECTIVES To assess whether thermodilution cardiac output determination based on measurement of injectate temperature in vivo leads to more accurate and precise estimates and to study the influence of chilled injectate on test performance. BACKGROUND Cardiac output measurement via right heart catheterization is used extensively for hemodynamic evaluation in a variety of diagnostic, periopera...

Degradation processes, caused by the extreme values of current pulses or thermal burn-in, are studied in thermistors with negative temperature coecient of resistance. The drift of thermistor resistance at 25°C is observed. These changes depend on the value and the number of current pulses. The ®rst 100 cycles are the basic ones for the future exploitation parameters of thermistors. Similar e€e...

To develop a new kind of thermistor with the negative temperature coefficient (NTC) behaviour, Cu/Mo co-doped YFeO3 based ceramics were prepared by wet-chemical synthesis and sintering at 1300?C. The orthorhombic perovskite structure was identified in all XRD analysis. possible valence states Fe, Cu Mo doped compounds examined X-ray photoelectron spectroscopy. By adjusting concentration Cu- Mo-...

Development of a low-cost computer-based system for multi-point measurement of velocity and temperature has been completed. The principle is based on hot-wire anemometry. A typical probe consists of a cold thermistor for flow temperature detection and a hot thermistor for flow velocity detection. The later is selfheated by a thermal potentiometer circuit. The change in resistance of the thermis...

A main advantage of thermistors for temperature measurement is their extremely high sensitivity. For example, a 2252 Ω thermistor has a sensitivity of -100 Ω/°C at room temperature. Higher resistance thermistors can exhibit temperature coefficients of -10 kΩ/°C or more. In comparison, a 100 Ω platinum RTD has a sensitivity of only 0.4 Ω/°C. The physically small size of the thermistor bead also ...

Abstract A good aromatherapy experience of an incense stick with filter material depended heavily on the barrier effect particles and comfort temperature aroma. The lack accurate methods to determine aroma greatly hindered quality control product development aromatherapy. In this study, a novel method was proposed measure negative coefficient thermistor needle thermocouple. experimental results...

The paper covers some of the basic mechanical characteristics of a recently developed bi layer thermistor: polycarbonate/(001) oriented layer of organic molecular conductor α’-(BEDT-TTF)2IxBr3-x, were BEDT-TTF=bis(ethylenedithio)tetrathiafulvalen. The nano and macro mechanical properties have been studied in order to use this flexible, low cost thermistor in sensing applications by proper way. ...

Methods. Air at room temperature and humidity was continuously administered to 15 braininjured, intubated and mechanically ventilated patients via a sponge-tipped oxygen catheter in each nostril at a combined rate of 115 ml kg 1 min . Brain temperature was measured using a pressure–temperature Camino catheter which is designed to site the thermistor 1 cm into the parenchyma in the frontal lobe....

Thermistors with negative temperature coefficient (NTC) of resistivity are important components for sensors and actuators. High material constant (B value) NTC thermistor, i.e. high-temperature sensitivity, is one key focuses. Herein, Bi/Mg modified NiO based ceramics thermistors were prepared by conventional solid-state reaction method. Introduction Bi2O3 significantly enhances the sintering a...