Methods of functioning of the information-measuring and control system for the synthesis of transparent conductive oxides

Background. The object of the study is an information - measuring and control system for the synthesis of transparent conductive oxides. The subject of the study is the method of functioning of the specified system designed for the synthesis and measurement of parameters of transparent conductive oxides. The purpose of the work is to increase the controllability of the synthesis of transparent conductive oxides by spray pyrolysis, to improve the reproducibility of coatings obtained on the basis of the spray pyrolysis method. Materials and methods. The development of a methodology for the functioning of an information- measuring and control system for the synthesis of transparent conductive oxides is based on the model proposed by the authors of the relationship between the parameters of the synthesized coatings by technological modes, as well as on the creation of the information content of the system. In turn, the information content of the system consists of databases of functional dependencies of the quality parameters of the created coatings on influencing factors. For example, a database of the dependencies of surface resistance on temperature and on the technological modes of synthesis of transparent conductive oxides has been developed. Results. The method of functioning of the information-measuring and control system for the synthesis of transparent conductive oxides has been developed, which selects the technological modes of application of transparent conductive oxides, as well as measurement and control of the temperature regime and surface resistance of transparent conductive oxides. Conclusions. The developed method of functioning of the information- measuring and control system for the synthesis of transparent conductive oxides allows you to effectively control the process of synthesis of transparent conductive oxides by spray pyrolysis, which guarantees the reproducibility of coatings with specified properties and allows you to control the quality of products based on the measurement of surface resistance

The metrological aspects of converters based on operational amplifiers used to measure the electrical parameters of oxide coatings

Background. The study is devoted to the issue of improving the accuracy of automated measuring instruments for the electrical parameters of oxide coatings. In measuring instruments, integrating circuits based on an operational amplifier, which is a universal amplifying device, are used to perform linear mathematical operations on analog signals. The disadvantage of the integrating circuit is the use of an operational amplifier, when using which it is necessary to take into account many parameters and factors that can affect the output signal, and hence the accuracy of the measured value. Materials and methods. Methods of indirect measurement of voltage and current on the studied sample with an oxide coating using the proposed structures of measuring channels are presented. It is shown that the parameters of operational amplifiers have a significant influence on the additive and multiplicative errors of measurement results, for the analysis of which a linear model of an operational amplifier is considered. Results. Based on the metrological analysis of the voltage measurement channel on the test sample, formulas for estimating additive, multiplicative and nonlinear error components are obtained. The contribution of multiplicative and additive parameters of the operational amplifier to the error of measurement results is analyzed in detail. Conclusions. Metrological analysis of the equivalent circuit of an operational amplifier with feedback has been performed, which can be used to estimate additive and multiplicative errors of circuits based on operational amplifiers widely used in instruments and measuring systems. It is shown that the total relative error of the developed channels for measuring current and voltage does not exceed 0.5%, which makes it possible to measure these values of the studied oxide coatings with guaranteed accuracy

Study of strange matter production in the heavy ion collisions at NUCLOTRON

It is proposed to install an experimental setup in the fixed-target hall of the Nuclotron with the final goal to perform a research program focused on the production of strange matter in heavyion collisions at beam energies between 2 and 6 A GeV. The basic setup will comprise a large acceptance dipole magnet with inner tracking detector modules based on double-sided Silicon micro-strip sensors and GEMs. The outer tracking will be based on the drift chambers and straw tube detector. Particle identification will be based on the time-of-flight measurements. This setup will be sufficient perform a comprehensive study of strangeness production in heavy-ion collisions, including multi-strange hyperons, multi-strange hypernuclei, and exotic multi-strange heavy objects. These pioneering measurements would provide the first data on the production of these particles in heavy-ion collisions at Nuclotron beam energies, and would open an avenue to explore the third (strangeness) axis of the nuclear chart. The extension of the experimental program is related with the study of in-medium effects for vector mesons decaying in hadronic modes. The studies of the NN and NA reactions for the reference is assumed