ERROR IN MEASURING THE MAGNETIC LIQUID MAGNETIZATION BY THE NUCLEAR MAGNETIC RESONANCE, CAUSED BY THE UNCERTAINTY OF THE EFFECTIVE FIELD CONSTANT

The magnetic liquid magnetization is usually determined by measuring the magnetic field strength, which linearly depends on the effective field constant of the liquid and the demagnetization coefficient of the sample. The article proposes to measure the magnetic field strength, generated by the same magnetic liquid in the samples of different shapes, and to determine the magnetization relying on the difference in strength, generated by the samples of various shapes, taking advantage of the fact that the effective field constant does not depend on the shape of the sample

A COMPUTER SYSTEM FOR COMPARISON OF LIFE CYCLE CHARACTERISTICS OF PACKAGING MATERIALS

A computer system was described for comparison of life cycle characteristics of packaging materials. The system allows, at given requirements for packaging materials, to evaluate the complex of properties of packaging materials, to calculate specific and generalized criteria for evaluating packaging materials and to provide the user with the opportunity to choose the most suitable packaging material based on the results. The developed system includes a library of customizable criteria, a database of rules for selecting packages, databases of life cycle stages, packages, packaging materials, and characteristics of packaging materials. The system was tested on the example of comparative analysis of the process of production of raw materials for packages and manufacturing packages, which may include fresh raw materials and recycled resources. Testing results confirmed the computer system operability and possibility of using it for a comprehensive assessment of the life cycle of the production of packaging materials taking into account environmental safety, consumer and economic characteristics.

ADAPTIVE CONTROL OF TECHNOLOGICAL PROCESSES WITH DELAY IN CONTROL

A method for the synthesis of adaptive systems by technological objects with control delay is proposed in the presence of a significant uncertainty in the setting of the delay value and time-variable coefficients of the linear inertia part model, which ensures the robustness of the system with respect to the delay. Adaptive identification-type systems and direct adaptive control systems without predictor are considered. The system with roughness in relation to the change in the delay value is used as the main contour

HEAT EXCHANGE IN A PLANE CHANNEL IN A TURBULENT FLOW REGIME IN THE CASE OF SMALL VALUES OF PRANDTL NUMBER ACCORDING TO DATA OF DIRECT NUMERICAL SIMULATION

Using the results obtained by the method of direct numerical simulation of the heat transfer process in a flat channel by various authors, it is shown that at small values of Prandtl number quite a few characteristics of the heat transfer process in a flat channel depend not on Reynolds and Prandtl numbers separately, but on Peclet number. Peclet number is calculated from the so-called dynamic speed

MULTIAGENT SYSTEM OF FORECASTING OF CHAOTIC PROCESSES ON THE BASIS OF STATISTICAL EXTRAPOLATORS

The problem of the of a non-stationary system state predicting is considered. The decision based on the joint processing of the results obtained by a group of independent statistical extrapolators. In the terminology of multiagent systems, each extrapolator is an intelligent agent. The quality of the agent solutions is evaluated on retrospective data and is used as weight characteristic in the problem of a terminal solution estimation. The specificity of non-stationary processes with a chaotic system component leads to the empiricca version of the forecast generation algorithm

THE ANALYSIS OF POSSIBLE FAULTS OF TECHNOLOGICAL PROCESSES IN THE RECOVERY BOILER

The analysis of technological processes for a real control object-a recovery boiler is performed in order to determine faults and possible emergency situations. The recovery boiler is considered as a complex control object (in which a chemical reactor is combined with a steam power boiler), which is advisable to decompose into several interconnected subsystems. The study was carried out in accordance with the HAZOP application manual in the form of a qualitative analysis of faults and possible abnormal situations in the recovery boiler. The study was conducted in accordance with the decomposition of the recovery boiler for each constituent of the interconnected subsystems. As a result of research, for each of the subsystems of the recovery boiler, HAZOP work tables were developed that allow you to identify root frames-linked to specific causes of possible faults.

AN INTELLIGENT INFORMATION SYSTEM DESIGN FOR ANALYSIS AND PREDICTION OF THE DYNAMICS OF RISKS OF THE COMPETITIVENESS OF REGIONS OF THE RUSSIAN FEDERATION

It was revealed that there are no generally accepted methods for assessing competitiveness; modern research is mainly a theoretical analysis of regional competitiveness. It was substantiated that the use of mathematical models and quantitative methods will improve the objectivity of the assessment. A methodology for an information system design for analysis and prediction of the dynamics of risks of competitiveness of regions of the Russian Federation was proposed. The prospects and directions of intellectualization of that system were shown. Based on the analysis of officially published statistical data and information from the regions and the proposed methodology, methods of systematization of socio-economic indicators were designed. An information system module was developed to implement the model based on the Kolmogorov-Chapman equations for assessing the risks of regional competitiveness and its validation was carried out

SYNTHESIS OF ZINC SULFIDE RADIOLUMINESCENT PHOSPHORS WITH USE OF ELECTRONIC BEAM MODIFICATION AND INVESTIGATION OF THEIR PROPERTIES

Synthesized recombination-type zinc sulfide phosphors used in solid-state radioluminescent light sources (SSRLS) are the object of the research. In the course of the study, experimental data were obtained for the first time on the effect of the amount of the incorporated activator on the brightness-spectral characteristics of radioluminescence upon excitation by β-radiation of tritium. Data were obtained on the changes in the radioluminescence parameters under various synthesis conditions, phase composition and electron-beam modification of the crystal structure of the initial phosphors. The results of the work make it possible to find the best light compositions for the use in solid-state radioluminescent light sources

THE MAIN CONCEPTS OF SYNTHESIS OF PEPTIDES AS A NEW GENERATION OF BIOLOGICALLY ACTIVE DRUGS

Currently, peptide-based drugs are increasingly replacing dosage forms which have been widely used for many years due to their affinity for living organisms and greater selectivity to biological targets, which lead to a growing demand. To meet that demand, a method using a solid polymer carrier (solid-phase synthesis), which has no alternative for fast and large-scale synthesis, is used. Nevertheless, work on its improvement is carried out non-stop, not only to optimize the chemical process, but also to bring the process to compliance with environmental standards dictated by modern concepts of green chemistry

INFLUENCE OF VANADIUM OXIDE ADDITIVE ON THERMAL TRANSFORMATIONS OF CERAMIC MASS

A comparative study of thermal transformations of ceramic mass (CM) based on α-Al2O3 modified with vanadium oxide additives introduced into CM by wet mixing and by deposition on the surface of the CM particles using molecular layering nanotechnology was carried out. The structural and chemical transformations of the obtained compositions were characterized by differential thermal analysis under linear heating conditions at a rate of 10°С/min, in the temperature range from room temperature to 1000°C. Changes in the phase composition, specific surface area of the compositions, and the state of the modifying additive before and after heating were studied using x-ray diffraction, low-temperature nitrogen adsorption, and ultraviolet–visible diffuse reflectance spectroscopy