Processing Of Experimental Data Research Articles

FEATURES OF THE APPLICATION OF THE SCILAB MATHEMATICAL PACKAGE IN THE PROCESS OF TEACHING THE DISCIPLINE «HIGHER MATHEMATICS»

The article notes that the choice of software is of great importance in teaching the discipline «Higher Mathematics». The complexity and type of tasks to be solved depend on the functionality of the selected program. It is emphasised that the methods of approximate, primarily numerical, solution are used. The methods of numerical solution of mathematical problems have always been an integral part of mathematics and have always been part of the content of natural-mathematical and engineering education. This article uses the Skilab math package as software. It is a multi-functional package designed for performing engineering and scientific calculations, which allows you to perform complex algebraic calculations, solve problems of differentiation and integration. All this contributes to the successful use of the Scilab mathematical package in the process of teaching the discipline «Higher Mathematic». The author draws attention to the fact that Skilab is a computer mathematics system designed to perform engineering and scientific calculations, such as: solving nonlinear equations and systems; solving linear algebra problems; solving optimization tasks; differentiation and integration; processing of experimental data (interpolation and approximation, method of least squares); solution of ordinary differential equations and systems. Skilab provides wide opportunities for creating and editing various types of graphs and surfaces. The Skilab system contains a sufficient number of built-in commands, operators and functions, and its distinctive feature is flexibility. The user can create any new command or function and then use it alongside the built-in ones. The article states that the use of modern mathematical packages significantly increases the intensity of cognitive activity, raises the level of mathematical preparation, improves the knowledge control system, and promotes learning motivation. The perspective of the development of the study of the use of mathematical packages is the development of a database on the issues of their use during the educational process, which should take into account the professional orientation of future activities. This approach provides a more effective application of interdisciplinary connections, which contributes to the in-depth study of the material and the expansion of opportunities for independent learning.

Water in Epoxy Coatings: Basic Principles of Interaction with Polymer Matrix and the Influence on Coating Life Cycle

This review describes the interaction of epoxy coatings with water, the kinetics of water uptake in epoxy resins, and the methods of studying the latter (gravimetric, IR (Infrared) and NMR (Nuclear magnetic resonance) spectroscopies). The analysis of experimental data requires using mathematical models which simulate the processes that occur during water uptake in a polymer matrix. This review classifies the numerous models applied for the study of water absorption into two large groups: Fickian and non-Fickian models. Fickian models involve the Fickian diffusion model and its development for the case of anomalous diffusion, as well as the models of Jacobs–Jones, Berens–Hopfenberg, and the time-varying diffusion coefficient model. The Carter–Kibler approach is provided as an example of a non-Fickian or Langmuir-type model. A critical analysis of the experimental methods is provided, including advantages and possible experimental errors. The methods used for processing experimental data are discussed as well as the effect of water on the exploitation properties and life cycle of epoxy coatings.

Integration of Automatic Procedures for Acquisition, Processing, Storage, Analysis and Monitoring of Experimental Data in Physics Education

Integration of Automatic Procedures for Acquisition, Processing, Storage, Analysis and Monitoring of Experimental Data in Physics Education

A COMPREHENSIVE APPROACH TO THE MANAGEMENT OF PSYCHOLOGICAL SERVICES IN THE EDUCATION SYSTEM OF UKRAINE: ECONOMIC COMPONENT

The subject of the research is the main problems related to the economic consequences of the war, which can affect Ukrainian education in the war and post-war period. Methodology. Theoretical and empirical research methods are used, in particular: theoretical analysis and generalisation of psychological practice; development of theoretical approaches and organisational and methodological conditions for improvement of practical activity of specialists of psychological services; surveys; study of methodical and reporting documentation; methods of statistical processing of experimental data. The purpose of the article is to determine the factors that can affect the quality of education and economy through aspects of the activity and peculiarities of the functioning of the psychological service in the educational system of Ukraine in the conditions of armed aggression of the Russian Federation. It is noted that the consideration of psychological factors is necessary to substantiate the activity of a psychological service specialist in the educational system of Ukraine, in connection with the complication of working conditions, competent management of the team, support and assistance in the realisation of the creative potential of employees of educational institutions, etc. The issue of creating psychological support for participants in the educational process was raised. It was noted that the provision of psychological support, development and implementation of correctional programmes will help to overcome stress and injuries, contribute to the return of pupils and students to full-time studies and ensure their further successful adaptation. The article presents the experience of pedagogical and methodological provision of psychological support at the all-Ukrainian level at the State Scientific Institution "Institute of Education Content Modernization". It gives recommendations on how to overcome the negative economic consequences of the war and the negative psychological impact on Ukrainian education. The publication describes the aspects of the psychological service in the educational system of Ukraine, in particular, conducting scientific research on the problems of methodology and theory of practical psychology of education, studying the patterns of mental development and formation of the child's personality; development of methods and technologies for the work of practical psychologists and social pedagogues, including professional training and advanced training of specialists; creation of an effective structure of the psychological service of education, which ensures the interaction of all parts of the service on subject and organisational issues. The results of the study reflect the state and development of the psychological service in the education system of Ukraine, the analysis of the activities of the psychological service under martial law and the implementation of Article 76 of the Law of Ukraine "On Education". Conclusion. Creation of conditions for quality education and support of psychological well-being of all participants of the educational process is a priority task of the psychological service in the educational system of Ukraine. According to the results of the analysis of the work of the psychological service in the educational system of Ukraine, it was determined that the psychological support of learning, psychological and socio-pedagogical support of the participants of the educational process in the conditions of martial law is an essential condition for maintaining and strengthening the mental health of future Ukrainian generations. This will contribute not only to the post-war reconstruction of society, but also to the future economic development and stability of Ukraine.

Investigation of the influence of technological factors on the throughput capacity of the dispenser of a pneumatic sowing machine

One of the significant directions of scientific research in terms of improving the design of sowing machines and increasing their adaptability to modern requirements of automation is the creation of dispensers that provide adjustment of the seeding rate during the operation of the sowing machine. Specialists of the Siberian Research Institute of Mechanization and Electrification of Agriculture have developed a sample of a pneumatic sowing machine dispenser, which was used as a prototype in the study. The dispenser used allows for a smooth adjustment of the seed rate in accordance with the map task, as well as automatic shut-off of the seed supply to the seed line when the machine turns at the headland to prevent overconsumption of seeds and reseeding. The purpose of the research is to determine the design and technological parameters of the experimental dispenser of the pneumatic sowing machine. To achieve the set goal the following tasks were formulated: 1) to conduct a laboratory study of the process of seed metering in the experimental dispenser of the pneumatic seeding machine; 2) to determine the regularities of mutual influence of significant factors on the throughput capacity of the dispenser and describe them by regression equations. In accordance with the listed tasks the process of seed dosing on the laboratory unit was studied. In the course of experimental data processing, regression dependencies were obtained. According to the characteristics of the obtained equations, it is found that the most significant influence on the throughput capacity of the dispenser is the volume of the dispenser coil. Maximum performance of the dispenser is noted at rotor speeds in the range of 80–100 rpm. The highest feed rate and avoidance of spontaneous seed leakage from the dispenser into the seed pipe are achieved at a gate height of the dispenser discharge window within 2 cm. The results of the research can be used to finalize the design of the dispenser in order to use it as an actuator of the system of complex automation of the sowing unit.

Spatial Filtering of Signals under Imprecise Calibration of Antenna Arrays

Introduction. Spatial filtering of signals is performed for the selection the signals of interest when the signals spectra overlap. The quality of spatial filtering depends on the accuracy of antenna array (AA) calibration, which allows estimation of the amplitude-phase distribution (APD) at all possible directions of arrival, thus ensuring the identity of reception paths. A mismatch between the actual and measured APD values leads to quality degradation in all spatial filtering methods.Aim. To develop a method for improving the quality of signal spatial filtering based on the estimates of the desired and interfering signal arrival directions formed by the MUSIC and ESPRIT algorithms under a priori uncertainty and imprecise AA calibration.Materials and methods. The quality of spatial filtering is improved by rejecting the interfering signals unsuppressed due to imprecisely measured APD of an AA. Statistical simulation modeling was carried out in the MATLAB environment; the data obtained experimentally were analyzed.Results. A method for spatial filtering based on MUSIC and ESPRIT completed with an additional rejection of unsuppressed interfering signals due to imprecise AA calibration is developed. An algorithm for basis construction for rejection under of a priori uncertainty of the signal-interference environment is substantiated. The results of statistical simulation modeling and experimental data processing have shown the feasibility of additional rejection applied to the selected signals by spatial filtering.Conclusion. The developed method for spatial filtering under the conditions of a priori uncertainty of the signal-interference situation and imprecise calibration of AA and reception paths ensures high quality characteristics across a wide dynamic range of desired and interfering signals. Whereas the Capon's method, which requires a priori knowledge of the arrival direction of the desired signal or its estimation, is capable of selecting only weak signals and suppressing strong ones under the conditions of imprecise APD.

Model predictive control of an electrically-heated steam methane reformer

Steam methane reforming (SMR) is one of the most widely used hydrogen (H2) production processes. In addition to its extensive utilization in industrial sectors, hydrogen is expanding it share as a clean energy carrier, and more sustainable and efficient H2 production methods are continuously being explored and developed. One method replaces conventional fossil fuel-based heating with electrical heating through the flow of electrons across the reformer. At UCLA, an experimental setup was built of an electrically heated steam methane reforming process. This paper describes the system components, explains the digitalization of the experimental setup and introduces methods for building a first-principles-based dynamic process model using parameters estimated via data-driven methods from process experimental data. The modeling approach uses a lumped parameter approximation and employs algebraic equations to solve for gas-phase variables. The reaction parameters are calculated from steady-state experimental data, and the temperature change is modeled with respect to change in electric current using a first-order dynamic model. The overall dynamic process model is then used in a computational model predictive control (MPC) scheme to drive the process to a new H2 production set-point under unperturbed and steam flowrate disturbance cases. The performance and robustness of the proposed MPC scheme are compared to the ones of a classical proportional–integral (PI) controller and are demonstrated to be superior in terms of closed-loop response, robustness, and constraint handling.

The Development and Adaptation of a Predictive Model of Full-Factor Optimisation of the Basic Probiotic Fermented Dairy Product Technological Process

Introduction: In the conditions of rapidly developing markets and the increasing needs of the population for new types of products with long shelf life, there is a need to expand their range, further improve their quality and biological value, and modernize traditional technologies. The main means of achieving these goals is to increase the efficiency and quality of scientific research and accelerate the introduction of scientific achievements in industry. The latter will make adjustments to accelerate the development of effective technologies of whole-milk products. The use of new methods of experiment planning in order to optimize technological processes will reduce the duration of research on the creation of new types of products.Purpose: The article is devoted to the research related to the development and adaptation of a predictive (mathematical) model for optimization of the technological process of probiotic fermented dairy product production. This approach will allow to ensure the design of a certain set of formulations for probiotic fermented dairy product, in which the relative biological value (RBV) will correspond to the maximum value at satisfactory given process parameters.Materials and Methods: The objects of research were: probiotic fermented dairy product manufactured in accordance with the developed mathematical model of the process. The search of specialized literature was carried out using electronic databases: E-library, Scopus, MDPI, Science Direct. Mathematical processing of experimental data for the development of the probiotic fermented dairy product model was carried out using Microsoft Excel 2010 (Microsoft Corporation, Ink.) with the "Solution Search" add-in, as well as specialized software packages TableCurve 2D v.5.01 (SYSTAT Software, Ink.) and Wolfram Mathematica 10.2 (Wolfram Research, Ink.).Results: A mathematical model for optimization of the technological process of probiotic fermented dairy product production was developed. A full-factor experiment (FFE) was conducted, in which the mass fraction of sucrose ( , %) and fat-protein index (r) - the ratio of the mass fraction of fat to the mass fraction of protein in the normalized mixture in the intervals from 0 to 10 and from 0 to 1.5%, respectively, were taken as independent factors. RBV was taken as the resultant factor. Based on the results of the research, a refined mathematical description of the dependence of RBV indicator on the mass fraction of sucrose and fat-protein index was obtained. The set of data on the influence of the mass fraction of sucrose on the dynamics of local maximum of RBV and the dynamics of the corresponding values of the mass fraction of fat showed that the maximum of RBV equal to 244.866% corresponded to the mass fraction of sucrose equal to 7.31%. The latter corresponded to the optimum fat-protein index of 1.241. In order to ensure maximum RBV, the lower limit of the mass fraction of fat had to correspond to 3.475%. The analysis of the FFE data showed the presence of additional corrective factors of RBV indicator dependence on fat and protein mass fraction indices. To refine the developed model taking into account additional factors, a correction factor (Q) was introduced into it.Conclusion: Approbation of the optimization model of the technological process of probiotic fermented dairy product production and the obtained mathematical dependencies can serve as a criterion for the formation of a set of formulations for the production of sugar-containing fermented dairy products with a high potential of relative biological value. It should be taken into account that the definition area of this approach is limited in terms of mass fraction of fat in the range from 0.06 to 4.84% and mass fraction of protein - from 2.8 to 3.9%. With this approach (model development) it is possible to analyze promising modes for the studied process, which in real conditions at the experimental stage are not always possible to obtain. The development of this model will significantly reduce the duration of research on the optimization of the technological process.

Study of sorption of platinum, palladium and rhodium ions on a carbon sorbent

The article is devoted to the sorption concentration of platinum (II,IV), palladium (II) and rhodium (III) ions from chloride media on a carbon synthetic sorbent. For the study of the sorption concentration of platinum group metals, the carbon synthetic sorbent Lewatit AF5 was chosen. This sorbent has high mechanical strength, high surface area, narrow pore size distribution, and low cost compared to silicate or polymer sorbents. Sorption concentration was carried out under static conditions from model chloride solutions. The concentration of analytes in the initial solutions ranged from 8 to 50 mmol/dm3. Equilibrium concentrations of metals in solutions were determined by inductively coupled plasma atomic emission spectrometry. The dependences of adsorption on contact time, free acidity and redox potential of the system were studied, and the limiting absorption values for each of the metals studied were determined. The study of the kinetic parameters of the sorption of Pt (IV), Pd (II) and Rh (III) ions was carried out from chloride solutions characterized by free acidity values of 0.01 mol/dm3. The time for establishing sorption equilibrium was determined, which was 4 hours for each of the ions. When studying the dependence of adsorption on free acidity and the oxidation-reduction potential of the system (ORP), it was revealed that with an increase in free acidity and redox potential, a decrease in sorption activity is observed, thus we can conclude that aquated complexes of platinum metals, in which metals present not in the highest oxidation state, involved in the sorption process. Processing of experimental data showed the applicability of the linear equation of the Langmuir isotherm for the description of the adsorption process, the limiting adsorption values were calculated, using which the sorption capacity of the sorbent was assessed. The sorption capacity for Pt (II, IV), Pd (II) and Rh (III) was 1.24 mmol/g; 1.16 mmol/g and 0.57 mmol/g, respectively. High values of sorption capacity, as well as a fairly short time to achieve sorption equilibrium without the use of means for the acceleration of the process, in combination with the mechanical characteristics of the sorbent, allow us to conclude that the Lewatit AF5 sorbent is promising for the concentration of platinum group metals from hydrochloric acid solutions.

Effect of Paracetamol Biodegradation Products Quantitative Indicators of the Anatomical Structure of the Lily of the Valley Leaf (<i>Convallaria majalis</i> L.)

Introduction. Due to the global pharmaceutical pollution of water bodies in many countries, there is currently an increasing interest of researchers in finding effective, including microbiological, ways of processing pharmaceutical waste to obtain new useful products based on them. The results of previous studies have shown that the product of bacterial destruction of paracetamol exhibits pronounced stimulating properties in relation to medicinal plants of the aster, linseed, clear-flowered, plantain, etc. families. There is no information about the effect of this product on plants of the liliaceae family.Aim. To investigate the effect of the paracetamol biodegradation product on the quantitative indicators of the anatomical structure of the lily of the valley leaf – Convallaria majalis L., fam. Liliaceae.Materials and methods. The experiments were laid in the Kirov region (2021, 2022) in accordance with the Guidelines for Conducting Registration Tests of Growth Regulators (2016). The scheme of the experiment: the control area – natural watering with water; the test area – watering with the product of biodegradation of paracetamol obtained on the basis of the laboratory of alkanotrophic microorganisms of the PFRC UB RAS (Perm); the reference area – watering with the growth stimulator "Zircon" (NRPP "NEST M", Russia). Quantitative parameters of the anatomical structure of the lily of the valley leaf were evaluated by the linear dimensions of the epidermis, elements of the conducting system and mesophyll. Viewing, photographing and processing of photographs was carried out using a microscope Motic (Motic Deutschland GmbH, Germany) in the program Motic Image 2000. Mathematical processing of experimental data was carried out by the method of variance analysis using Excel 2019, STATISTICA 12.6, STATGRAPHICS Plus 5.1 programs.Results and discussion. Anatomical examination showed an increase in the size of the cells of the upper and lower epidermis of the lily of the valley leaf in the designated growing seasons on the accounting sites treated with a product of the biodegradation of paracetamol and a standard ("Zircon") in comparison with the control (water). When using the biodegradation product of paracetamol, an increase in the thickness of the mesophyll by 10–16 % and the number of layers by 14–30 % was recorded. When using the growth stimulator "Zircon", the thickness of the mesophyll and the number of its layers increased by 3–6 % and 8–15 %, respectively. The increase in the thickness of the phloem and xylem of the conductive beam when treated with the paracetamol biodegradation product was 20–30 % greater than in the control, and 2 times greater than when treated with the growth stimulator "Zircon".Conclusion. The product of the biodegradation of paracetamol in different years of use, regardless of environmental factors, shows a pronounced stimulating effect on the lily of the valley of the May, significantly increasing the quantitative indicators of the anatomical structure of the leaf compared with the growth stimulator "Zircon" and control (water). The obtained data can be used in medicinal plant growing in the development of agrotechnical methods for growing raw materials of the lily of the valley of the May, as well as in the formation of a dossier when registering this product as a new plant growth stimulator.

Prototype of Intellectual System for Research of Space Weather Parameters

An analysis of the state of space weather research has been conducted, based on which the main problem has been identified and its relevance has been justified. Monitoring, researching, and forecasting space weather conditions receive significant attention in developed countries around the world. Despite significant progress in addressing this issue, the structure of solar-terrestrial connections is not fully understood, and the risks associated with space weather are increasing as the key aspects of our lives become increasingly technologically advanced. Today, in the structure of solar-terrestrial connections the influence of solar activity on the Earth’s lower atmosphere, including atmospheric infrasound and the electric field, remains insufficiently studied. This problem requires an examination of complex interactions that occur when different types of disturbances propagate through the Sun-Earth environment. Based on the developed generalized architecture of an intelligent system for researching space weather parameters, a prototype of this system has been proposed, and its functionality has been determined and developed. The prototype of the intelligent system is a client-server system built on the basis of server software, user software, and application software. The functionality of the intelligent system includes data collection, their preliminary processing, data processing, and visualization of the investigated signals. Data processing for space weather parameters includes spectral analysis of experimental data implemented using windowed Fourier transform and wavelet transform, as well as correlation-regression analysis, which allows for the investigation of the relationship between variables with the aim of identifying unknown causal connections. The intelligent system for researching space weather parameters will help identify new connections in the structure of solar-terrestrial interactions and study the impact of space factors on the Earth’s troposphere. The provided examples illustrate the results of processing experimental data for space weather parameters.

Experimental research procedure of roller forming unit

Experimental research is conducted followed by a comparative analysis of the results, which are obtained in the process of theoretical and experimental studies, to check the theoretical research adequacy of the roller forming unit with the crank drive.
 We have developed the experimental research program for the roller forming unit with the crank drive. The research stand of roller forming with the crank drive was used for experimental studies. This research stand allows you to carry out full-value experimental studies on the determination of dynamic loads unrestricted. The experimental research program provides the determination of the interaction force for the compaction roller with the construction mixture, the force in the unit connecting rod, the torque on the unit drive shaft and the power, which is necessary for the realization of the forming process. The determination of these loads will make it possible to realistically assess the condition of the forming unit and rationally carry out its design and operation.
 Plan, procedure and processing of experimental research data have been developed. The measuring and recording equipment were selected to determine the force loads of the research stand for conducting experimental studies, which transforms the received numerical data into Microsoft Excel for their processing. The measurement of the force in the connecting rod and the interaction vertical force of the compaction roller with the construction mixture was carried out using strain gauges. These are pasted according to the bridge scheme on the connecting rod and the metal plate, which is located in the form with the building mixture under the compaction roller. RK 435 universal clamps, which make it possible to measure the line voltage, the current strength and the power under unit different load modes, are used to measure the power required for the forming process.

Study of an autonomous solar power plant for a motorhome

Problem. An RV combines two essential features desired by modern travelers: the ability to relax in unconventional locations while still being able to work remotely if your job requires remote access. However, if you're accustomed to the conveniences that rely on electrical power, you'll find yourself searching for places to connect to the centralized power grid. Alternatively, you'll need to seek solutions to this issue. One of the most intriguing and effective solutions is the installation of a low-power solar power station on the RV, based on photovoltaic modules. This solution enables you to park and enjoy any location you prefer while benefiting from all the available technologies powered by electricity. Goal. This study aims to investigate the installation of an autonomous solar power station on an RV and determine its electrical power generation capacity. Methodology. Analytical research methods were employed to explore the development and application of solar energy conversion methods and devices to generate electricity. Experimental research methods and mathematical techniques for processing experimental data were also utilized. Results. The RV type suitable for installing an autonomous solar power station has been identified, specifically the Roller Team Sirio 599. An investigation of its equipment in terms of electricity consumption has been conducted. Furthermore, a self-sustaining solar station has been proposed for the selected RV, and the electricity generation schedule of this station has been studied. The electricity consumption by RV appliances has been thoroughly examined. Originality. This study explored the volt-ampere characteristics of photovoltaic modules and their power generation dependency on the load. The investigated photovoltaic modules demonstrate maximum operational efficiency in the active load range from 3 ohms to 3.5 ohms. Practical Value. The research findings indicate that starting from March, the solar power station on the RV is fully capable of meeting its electricity consumption needs. In the winter months, particularly in November, in Ukraine's climate conditions, this solar power station may only cover a portion of electricity consumption needs. Considering that electrical devices are often used for heating the RV, this solar power station should not be relied upon as the primary source of electrical power.

Interval type-2 evolving fuzzy Kalman filter for processing of unobservable spectral components from uncertain experimental data

In this paper, an interval type-2 evolving fuzzy Kalman filter (IT2EFKF) is designed for processing unobservable spectral components of uncertain experimental data. The primary objective of the methodology proposed in the present research is to provide a novel mathematical tool for interval and spectral processing of uncertain experimental data in order to deal with real-world filtering, tracking, and forecasting problems. The adopted methodology consider the following steps: an initial model of the interval type-2 fuzzy Kalman filter, which is off-line identified from an initial window of the experimental data; the updating of antecedent proposition of interval type-2 fuzzy Kalman filter by using an interval type-2 formulation of evolving Takagi–Sugeno (eTS) clustering algorithm and the updating of consequent proposition by using a type-2 fuzzy formulation of Observer/Kalman Filter Identification (OKID) algorithm, taking into account the multivariable recursive Singular Spectral Analysis of the experimental data. Computational results for tracking the Mackey-Glass chaotic time series demonstrate the effectiveness of the proposed approach when compared to related methodologies from the literature, with superior results for RMSE of 0.0026. Experimental results for tracking a 2DoF helicopter illustrate its applicability, with superior results for RMSE and VAF of 0.00156 and 99.9874% for yaw angle, and of 0.00702 and 99.8863% for pitch angle, respectively.

Исследование эффективности очистки воды от ионов аммония прокалённым сорбентом из золошлаковых отходов

Experimental studies of sorption on water treatment from ammonium ions by a calcined sorbent based on ash-and-slag waste from thermal power engineering have been carried out. The calcined sorbent was obtained by calcining samples of ash-and-slag from coal combustion at the Novocherkassk State District Power Plant at a temperature of 600 оC for 30 min. The sorption capacity of a sorbent with a dose of 2.0 g per 50 mL of a model solution, a stirrer speed of 200 rpm, pH 7, and sorption time from 10 to 180 minutes was studied. The influence of the initial concentration of model solutions with the content of ammonium ions 5, 20, 50 and 100 mg/L on the amount of adsorption and treatment efficiency was studied. The highest treatment efficiency of 60% was obtained for an initial concentration of ammonium ions in a solution of 20 mg/L. Processing of experimental data was carried out according to the models of pseudo-first, pseudo-second-order and intra-particle diffusion kinetics. The best description of the experimental data was obtained using the pseudo-first order model, which has the highest value of the coefficient of determination. The adsorption equilibrium in the system ammonium ions – calcined sorbent was studied for the initial concentration of ammonium ions in solution: 5, 20, 30, 50, 100, 200, 300 mg/L. Processing of experimental data on equilibrium was carried out on the basis of two-parameter adsorption isotherms: Langmuir, Freindlich and Temkin. The value of the coefficient of determination according to the Langmuir isotherm is the largest R2 = 0.9904. Dependences between the cleaning efficiency at adsorption equilibrium and the initial concentration of ammonium ions in solution for the system ammonium ions – calcined sorbent are obtained. With an increase in the initial concentration of ammonium ions in the solution, the treatment efficiency at low initial concentrations increases, and decreases with increasing concentration.

Robust cardinalized probability hypothesis density filter based underwater multi-target direction-of-arrival tracking with uncertain measurement noise

Direction-of-arrival (DOA) tracking of underwater targets is an important research topic in sonar signal processing. Considering the underwater DOA tracking is a typical multi-target scenario with uncertain measurement noise caused by unknown underwater environment, a robust underwater multi-target DOA tracking method with uncertain measurement noise is proposed by implementing a spatial matrix filtering (SMF) technique in the framework of the cardinalized probability hypothesis density (CPHD) filter. Firstly, the kinematic model of underwater targets and the measurement model based on the received signal of the hydrophone array (array signal) are established. Thus, the multi-target DOA tracking algorithm is derived by using the CPHD filter based on the established model. Moreover, to avoid the effect of the uncertain measurement noise, the SMF technique is implemented to process the array signal to extract the signal in the bearing angle of the target. Then, the output of the SMF is substituted into the CPHD filter. In this manner, the robust underwater multi-target DOA tracking method for uncertain measurement noise scenario is proposed. Finally, comprehensive simulations and experimental data processing are performed to prove the robustness of the proposed method in the scenario of multi-target DOA tracking with uncertain measurement noise. Compared with the existing DOA estimation and DOA tracking methods, the proposed methods significantly improve the robustness and the precision of the DOA of the underwater target.

Показатели качества потребления энергии в коллекторном и асинхронном тяговых приводах электровозов переменного тока

Purpose: To conduct an experimental study of the indicators of electrical energy consumption quality for serially produced freight electric locomotives of alternating current 2(3)ES5K with a collector traction drive and electric locomotives 2(3)ES5S with an asynchronous traction drive, to provide their comparison and comparative analysis. Methods: The main technical characteristics of the collector traction electric drive (TED) NB-514E and asynchronous TED DTA-1100 are presented. A measurement scheme for voltage and current on the power winding of the transformer is proposed. The monitoring of parameters has been carried out directly on electric locomotives using specialized metrological equipment. The processing of experimental data is based on decomposing the original signal into harmonic components using Fast Fourier Transform (FFT). Results: Parameters of voltage and current harmonics, phase shifts, as well as the values of active and reactive power of the corresponding harmonics have been obtained. An analysis of the spectral composition of voltage and current has been performed. Comparative analysis of the results obtained for electric locomotives with collector and asynchronous traction drives in traction mode has shown that the power factor is 0.65 and 0.99, respectively; and the coefficient of non-linear current distortions is 0.53 and 0.15. A conclusion has been drawn regarding significantly higher quality of electrical energy consumption in the asynchronous traction drive. Practical significance: Based on the specific values of the indicators of electrical energy consumption quality in collector and asynchronous traction drives in traction mode, it is possible to proceed to obtaining economic assessments for the transition of the locomotive fleet of Russian Railways (JSCo “RZD”) to nextgeneration electric locomotives of the 2(3)ES5S series.

Bacterial indicators during storage of slaughter products of turkeys of the meat sector of productivity with the use of the prebiotic drug Aktigen

Poultry breeding is one of the economically profitable branches of Ukraine. Poultry meat is in the greatest demand on the market, because it is affordable and dietary, poultry is easy to grow both on the farm and at home. This is one of the types of branches in agriculture, which in a short period of time is able to provide the population with biologically complete and high-quality products. One of the main questions remains: how to produce high-quality products without the use of prohibited antibiotics, which provoked a number of problems in the already imperfect agriculture. The refore, scientists began to look for an alternative that would replace antibiotics, while at the same time increasing the quality of meat and the resistance of poultry to diseases, increasing the increase in live weight. Therefore, farms began to use biologically active additives (BVD), one of them is Aktigen. The purpose of our research was to determine the effect of the complex prebiotic drug Actigen on the level of bacterial indicators during storage of slaughter products of turkeys of the meat sector of productivity. The object of study was turkeys of the BIG-6 breed. The prebiotic Actigen was added to the basic ration (OR) of turkeys in the following doses: from the 1st to the 21st day: 0.4; 0.8 and 1 g/kg feed; from the 22nd to the 42nd day: 0.4; 0.6 and 0.8 g/kg feed; from the 42nd to the 120th day: 0.2; 0.4 and 0.7 g/kg feed. Mixing of prebiotics with compound feed was carried out with a feed mixer at the farm for the production of compound feed. The bird had free access to feed and water during the entire fattening period. Research methods. Microscopic, microbiological (MAFAnM content, pathogenic and opportunistic microorganisms; bacterioscopy of swabs-imprints from poultry meat by counting the number of microorganisms per 1 average field of vision according to (DSTU DSTU 8381:2015; DSTU 8381:2015; DSTU ISO 6888–2:2003; GOST 7702.2.7–95), DSTU ENISO 6579-1:2017. Variational and statistical processing of experimental data was carried out using computer software packages “Microsoft Exel”, “Maple-12” (Company Maplesoft, 2008) for variational and statistical processing of digital data. Reliability was determined according to the Student's criterion, taking into account the confidence limit: Р ≤ 0.05; Р ≤ 0.01, Р ≤ 0.001. It was established that when feeding the prebiotic Actigen in the following doses: from the 1st to the 21st day: 0.4; 0.8 and 1 g/kg feed; from the 22nd to the 42nd day: 0.4; 0.6 and 0.8 g/kg feed; from the 42nd to the 120th day: 0.2; 0.4 and 0.7 g/kg of feed both in the pectoral muscles and in the femoral muscles of broiler turkeys of the control and experimental groups, MAFAnM indicators did not exceed the permissible level during the four-day storage period. During the storage period of thigh muscles, the indicator of total bacterial contamination gradually increased in all groups and on the fourth day reached the level in the experimental group – (1.73 ± 0.05)×103. The MAFAnM indicator of the thigh muscles of birds of the control group was (1.75 ± 0.11)×103 CFU. The insignificant difference between MAFAnM indicators of the control and experimental groups is not reliable. The level of opportunistic microorganisms, in particular, BGKP and Proteus in the muscles of the femoral group is not reliable between the indicators of the control and experimental groups, and does not exceed the permissible levels regulated by the regulatory documents of Ukraine. When examining the slaughter products of broiler turkeys for the presence of pathogenic microorganisms, in particular the genus Salmonella, S. aureus, L. Monocytogenes, Pasteurella ceae, Pasteurella spp., Avibacterium paragalinarum, Bordetella spp., Moraxella spp, Trueperella pyogenes, Erysipelotrix spp., Listeria spp. ., Pseudomonasspp., Enterobacreria ceae, Bacillus spp., Corynebacterium spp., yeast and mold were not detected in the muscles and edible offal of broiler turkeys in both control and experimental groups. The prebiotic Actigen used in the diet of broiler turkeys negatively affects the development of the above-mentioned microorganisms both during the life of broiler turkeys and under the conditions of storage of slaughter products during the specified periods. Slaughter products of broiler turkeys, which were fed with the prebiotic “Actigen” in the recommended doses according to indicators of bacterial insemination during the established storage period, can be sold without restrictions.

Mathematical Analysis of Aortic Deformation in Aneurysm and Wall Dissection

Aortic dissection is an extremely severe pathology. From the mechanics point of view, the aorta is a multilayered anisotropic reinforced shell, which is subjected to periodic loading under the action of pulse blood pressure. The questions of mathematical modeling of aorta and large arteries dissection are considered. A review of modern mathematical models of aortic and arterial wall structure obtained on the basis of experimental data processing on biaxial stretching of samples is carried out. Mathematical models can be conditionally divided into two classes: 1) effective models, when the internal structure of the wall structure is ignored, but the mechanical parameters of the material "averaged" over the wall thickness are introduced; 2) structured models, when the multilayer (up to three layers) structure of the artery is taken into account with the addition of one to four families of reinforcing fibers. One of the most widely used artery models, the Holzapfel – Hasser – Ogden model, is considered in detail. This model describes a two or three-layered artery with two families of reinforcing fibers. For this model tables of design parameters are given, numerical calculations of arterial rupture and dissection are carried out. The blood vessel is subjected to pulse pressure of blood flowing through it. It is shown that rupture of the inner layer of the vessel leads to an increase in the stress on the outer wall of the vessel. Increasing the thickness and length of the rupture increases the stresses on the outer wall of the vessel. The presence of an aneurysm of the vessel increases stresses twice as much as a vessel without an aneurysm. Splitting of the inner wall of the vessel leads to an increase in stresses on the wall – stresses fall with increasing rupture width for a straight vessel and rise for a vessel with an aneurysm. Stress calculations at the “tip” of delamination showed that the maximum stress is reached at the outer wall of the rupture.

Increased durability of glass composites

Composite materials based on cement binders are currently among the widely used for the construction of transport structures. In accordance with regulatory requirements, concrete for transport construction must have improved physical, mechanical and operational properties. One of the areas that makes it possible to obtain materials with improved properties is the use of various fillers, including waste from industrial enterprises. Among the variety of man-made waste, a significant part is broken glass, which is an effective secondary resource and can be used in the construction industry to produce binders, fillers, composites and structures based on them. The article presents the results of research aimed at increasing the durability of composite materials based on cement binders filled with cullet. Effective additives have been proposed to reduce the reactivity of broken glass with binders. Processing of experimental data was carried out using experimental planning methods. The study of the experimental design showed that it is possible to reduce the number of factors previously involved in the formation of the experimental planning matrix. It was established that the reduction in the number of factors is carried out with a confidence probability of at least 0,95. Experimental studies were carried out on the biological resistance of composites filled with broken glass and their components under the influence of filamentous fungi. It has been established that pre-treatment of the filler surface with a 1, 3, 5 % solution of potassium permanganate helps impart fungicidal properties to the composites, and treatment with a 7,5 % solution makes it possible to obtain filled materials with fungicidal properties.