Current article considers the results of the study of air and water flow temperature prediction error on the number of inputs in neural network. Authors guide the architecture of neural network for temperature prediction. The formula of temperature step response for real sensor is given. Also, the method for calculating the time constants for the temperature step response formula using real measurement data is considered.
While studying the physical foundations of the temperature standard, we obtained a quantum unit of temperature as the value of the temperature jump when one electron-phonon scattering per unit time. We expressed it in terms of the ratio of fundamental physical constants h/kB; it is equal to 3.199 493 42 ∙ 10-11 K with a relative standard uncertainty of 59.2 ∙ 10-8. The investigated quantum standard is recommended for use as an "intrinsic standard", which does not require continuously repeated measurements (to check its accuracy) in relation to the current unit of temperature.
The article dwells on the mathematical model of heat and mass transfer processes in „environment-protective clothing-human” system which takes into account simultaneous penetration of ambient heat and toxic chemicals in the multi-layer membrane of garments with air gap. On the basis of this model, the parameters of a gas and heat protective suit are reasonably defined.
Standards of physical quantities are used for reproduction and storage of physical units as well as for transfer its size by appropriate measuring instrument. The temperature is an intense value and is determined only indirectly depending on certain physical quantities of temperature, for example, resistance, thermoelectric power and so on. This situation has led to the fact that there are several temperature scales, each of which has its unit of temperature measure.
The improved method of compensation the influence of the lead wire resistance for two-wire resistance temperature detectors (RTDs) on the basis of commutation inverting of the reference measuring currents is proposed. For the averaging of signals generated as a result of commutation inverting of reference measuring currents, predominantly low-pass filters are used. Their usage limits the speed of temperature measurement.
As low velocity zones result from temperature destruction of rocks uncompensated by pressure at 5-20 km depths, changes in T at these depths can lead to change in intensity of the thickness of these zones and rate of decrease in Vp within them. Crustal thermobaric zones are shown to increase, decrease and disappear depending on ∂T/∂Н, ∂Р/∂Н, λ, Т. Instability of the crustal thermobaric zones of low velocity result in their episodic occurrence in the crust and their vertical and horizontal migration depending on temperature fluctuations in the crust.
Спроектовано спеціалізовану систему з мікропроцесорним обробленням сигналу на базі перепрограмованої системи на кристалі PSoC для контролю таких параметрів середовища, як температура та відносна вологість з використанням розроблених наноструктурованих давачів. Розроблено базу даних для реєстрації, зберігання та аналізу параметрів стану довкілля.
Mathematical modelling of heat exchange processes for an electric device of inhomogeneous structure and the analytical numerical estimate of the relevant boundary problem of heat conduction have been considered.
Are ways electrical frictional cutting billets by friction circular saws. The features of thermal phenomena in the processing and developed a mathematical model for calculating the contact temperature in the cutting zone, which takes into account complex thermo-physical conditions and modes of processing, thereby allowing control of processes of heat generation and the quality of the machined surface.
This paper deals with the accuracy of gas flow temperature measurement in natural gas metering systems. The effect of heat exchange between thermometer well and the pipe wall on the accuracy of gas flow temperature measurement is investigated. A mathematical model is proposed to calculate the additional systematic error of gas flow temperature measurement caused by heat exchange between thermometer well and the pipe wall. Calculation results were compared to the corresponding experimental values of this error.