bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determining the effect of treating table beet with biopreparations before storage on its preservation
Authors: Pusik Ludmila , Pusik Vlаdimir , Bondarenko Veronika , Gaevaya Ludmila , Lyubymova Nina , Sukhova Galyna , Didukh Nataliya , Slobodyanyk Galina 
Published: May 2021

The study reported here aimed to explore the preservation of table beet depending on its treatment with bio preparations before storage in order to prolong its shelf life.
The effect of aqueous solutions of the biopreparations Phytosporine and Gamair in concentrations of 0.2 %, 0.3 %, and 0.5 % on the intensity of quality loss by beetroots during storage was investigated.
It was found that the treatment with the bio preparations reduced the total weight loss by the roots Zepo F1 by 7.9‒10.3 %, Carillon F1 ‒ by 6.8‒7.7 %. The daily weight loss by untreated beetroots due to the damage induced by microorganisms ranged from 0.08±0.01 % at a storage temperature of 1±1 °С to 0.1±0.01 % at a storage temperature of 15±1 °С, respectively.
The sugar content in beetroots non-treated with bio preparations decreases during storage by 21.6–25.0 %. Treating beetroots with a 0.3 % solution of Phytosporine reduces sugar losses over 150 days at a storage temperature of 1±1 °С by 3.7–6.5 %; with a 0.3 % Gamair solution ‒ by 8.8–12.8 %.
The loss of vitamin C ranged from 39.4 % to 41.2 % relative to the initial content in the control. The treatment with Phytosporine reduced the loss of vitamin C to 17.4 % in Zepo F1, and 25.4 % ‒ in Carillon F1; with Gamair ‒ to 28.0 and 29.3 %, respectively. At a storage temperature of 15±1 °С, the content of vitamin C decreased by 1.5‒1.8 times over 90 days.
It was established that the preservation of table beet depends on the shape of a root. At a storage temperature of 1±1 °С, the weight loss by cylindrical beetroots is 5.1 %, rounded shape ‒ 5.4 %. The yield of marketable products ranges from 74.2 to 82.9 % for the Carillon F1 hybrid, and for Zepo F1 of a round shape ‒ 73.3–80.5 % depending on the storage temperature.
The technique of treating table beet before storage with bio preparations allows using Phytosporine and Gamair for post-harvest treatment of vegetable raw materials. When devising new, low-cost, environmentally friendly, and affordable technologies, this is an important tool.
Development of an optimization method for measuring the Doppler frequency of a packet taking into account the fluctuations of the initial phases of its radio pulses
Authors: Yevseiev Serhii , Kuznietsov Oleksandr , Herasimov Sergey , Horielyshev Stanislav , Karlov Anton , Kovalov Ihor , Kolomiitsev Oleksii , Lukashuk Olena , Milov Oleksandr , Panchenko Vitaliy 
Published: May 2021

The necessity of estimating the decrease in the accuracy of measuring the informative parameters of a radar signal in real conditions of its propagation and reflection has been substantiated. The results of the estimation determine the requirements for optimizing this measurement to achieve the required efficiency. A numerical analysis of the decrease in the accuracy of measuring the Doppler frequency of a coherent packet is presented, depending on the statistical characteristics of fluctuations of the initial phases of its radio pulses. Expressions are given for calculating the fluctuation component of the measurement error of radio pulse packet frequency for various coefficients of interpulse correlation of phase fluctuations. An assessment is made of the possibility of increasing the accuracy of Doppler frequency measurement, which can be ensured by statistical optimization of the algorithm for time-frequency processing of a given radar signal by taking into account its phase fluctuations. The conditions for the multiplicative influence of phase fluctuations of radio pulses of the received packet are substantiated, which determine the efficiency of optimization of Doppler frequency measurement.
Based on the results of the study, an optimization method for measuring the Doppler frequency of the packet taking into account fluctuations in the initial phases of its radio pulses is proposed. The accuracy of Doppler frequency measurement under the influence of both the internal noise of the radar receiver and the correlated phase fluctuations of its radio pulses is estimated. The efficiency of optimization of measuring the Doppler frequency of the packet is estimated taking into account fluctuations of the initial phases of its radio pulses by means of computer simulation. It is proved that, under the influence of phase fluctuations, the accuracy of Doppler frequency measurement can be increased due to the performed optimization from 1.86 to 6.29 times. This opens the way to improving the existing algorithms for measuring the higher time range derivatives to improve the quality of tracking complex maneuvering aerodynamic objects. This explains the importance and usefulness of the work for the radar theory.
Navigation safety control system development through navigator action prediction by data mining means
Authors: Nosov Pavlo , Zinchenko Serhii , Ben Andrii , Prokopchuk Yurii , Mamenko Pavlo , Popovych Ihor , Moiseienko Vladyslav , Kruglyj Dmytro 
Published: May 2021

Taking into account current trends in the development of ergatic maritime transport systems, the factors of the navigator’s influence on vessel control processes were determined. Within the framework of the research hypothesis, to improve navigation safety, it is necessary to apply predictive data mining models and automated vessel control.
The paper proposes a diagram of the ergatic vessel control system and a model for identifying the influence of the navigator “human factor” during navigation. Within the framework of the model based on the principles of navigator decision trees, prediction by data mining means is applied, taking into account the identifiers of the occurrence of a critical situation. Based on the prediction results, a method for optimal vessel control in critical situations was developed, which is triggered at the nodes of the navigator decision tree, which reduces the likelihood of a critical impact on vessel control.
The proposed approaches were tested in the research laboratory “Development of decision support systems, ergatic and automated vessel control systems”. The use of the Navi Trainer 5,000 navigation simulator (Wärtsilä Corporation, Finland) and simulation of the navigation safety control system for critical situations have confirmed its effectiveness. As a result of testing, it was determined that the activation of the system allowed reducing the likelihood of critical situations by 18–54 %. In 11 % of cases, the system switched the vessel control processes to automatic mode and, as a result, reduced the risk of emergencies.
The use of automated data mining tools made it possible to neutralize the negative influence of the “human factor” of the navigator and to reduce the average maneuvering time during vessel navigation to 23 %
Regularities in the washing out of water-soluble phosphorus-ammonium salts from the fire-protective coatings of timber through a polyurethane shell
Authors: Tsapko Yuriy , Vasylyshyn Roman , Melnyk Oleksandr , Lomaha Vasyl , Tsapko Аleksii , Bondarenko Olga 
Published: May 2021

The analysis of fire-protective materials for wooden building structures was carried out and the need to develop reliable methods for studying the process of washing out fire retardants from the surface of the building structure, which is necessary for the creation of new types of fire-protective materials, was established. That is why there arises a need to determine the conditions for the formation of a barrier for washing out and to establish a mechanism for inhibition of moisture transmission to the material. In this regard, a mathematical model was built of washing out fire retardants using a polymeric shell made of organic material as a coating, which makes it possible to estimate the effectiveness of a polymer shell by the amount of the washed-out fire retardant. According to the experimental data and theoretical dependences, the dynamics of the release of fire retardants from the fire-protective layer of the coating was calculated; it did not exceed 1.0 %, and therefore, ensures fire protection of timber. The results of determining the weight loss of the sample under the influence of water indicate the ambiguous impact of the nature of protection on the washout. In particular, this implies the availability of data sufficient for performing a high-quality process of moisture diffusion inhibition and, based on it, detection of the moment, from which a decrease in efficiency of a coating begins. The experimental studies proved that a sample of fire-protected timber after exposure to water for 30 days withstood the influence of a heat flow. In particular, the loss of timber weight after the temperature exposure was less than 6 %, and the temperature of flue gases did not exceed 185 °C. Thus, there is a reason to assert the possibility of directed control of the processes of fire protection of timber through the use of polymer coatings capable of forming a protective layer on the surface of fire-protected material, which inhibits the rate of washing out the fire retardants
Development of a method to improve the calculation accuracy of specific fuel consumption for performance modeling of air-breathing engines
Authors: Kislov Oleh , Ambrozhevich Maya , Shevchenko Mykhailo 
Published: May 2021

Determination of specific fuel consumption of air-breathing engines is one of the problems of modeling their performance. As a rule, the estimation error of the specific fuel consumption while calculating air-breathing engine performance is greater than that of thrust. In this work, this is substantiated by the estimation error of the fuel-air ratio, which weakly affects thrust but significantly affects the specific fuel consumption. The presence of a significant error in the fuel-air ratio is explained by the use of simplified methods, which use the dependence of enthalpy as a function of mixture temperature and composition without taking into account the effect of pressure. The developed method to improve the calculation accuracy of specific fuel consumption of air-breathing engines is based on the correction of the fuel-air ratio in the combustor, determined by the existing mathematical models. The correction of the fuel-air ratio is made using the dependences of enthalpy on mixture temperature, pressure and composition. The enthalpy of the mixture is calculated through the average isobaric heat capacity obtained by integrating the isobaric heat capacity, depending on mixture temperature, pressure and composition. The calculation accuracy of the fuel-air ratio was verified by comparing it with the known experimental data on the combustion chamber of the General Electric CF6-80A engine (USA). The average calculation error of the fuel-air ratio does not exceed 3 %. The developed method was applied for correcting the specific fuel consumption for calculating the altitude-airspeed performance of the D436-148B turbofan engine (Ukraine), which made it possible to reduce the estimation error of the fuel-air ratio and specific fuel consumption to an average of 3 %
Hydrological-stenobiontic method for determining environmental flows from reservoir
Authors: Bezsonov Yevhen , Muntian Liliia , Krysinska Diana 
Published: May 2021

In the practice of using river resources accumulated in reservoirs, there is a typical problem of unreasonably large water intake for industrial-household needs to the detriment of the aquatic ecosystem. An important tool for balancing these links is to provide environmental flows based on a comprehensive analysis of river functioning patterns. And in terms of a progressing negative impact of reservoirs on the integrity of river ecosystems, the choice of indicator hydrobiota for the calculation of environmental flows should be considered insufficiently substantiated. The solution of this problem, by filling the appropriate methodological niche, allowed substantiating the hydrological-stenobiontic method for determining environmental flows. The developed solutions are based on the minimum possible values of tolerance of aquatic ecosystems stenobionts to water velocity. Five groups of macrozoobenthos represent relevant target organisms. The hydrological calculations presented in the paper are based on the data of daily water flow rate for 80 years and the results of field studies of the river channel depth in the low water period. On this basis, it was determined that for lowland parts of rivers, the flow velocity in the tailwater of reservoirs should be at least 0.2 m/s. Comparison of the curve of the average monthly water velocity dynamics of 95 % runoff availability with the minimum corresponding requirements of stenobionts allowed determining the most threatening period of the year for the aquatic ecosystem – summer low water. For a reservoir in the lowland parts of the river, based on the developed method, the calculations substantiate an increase in the minimum volume of environmental flows by 40 % relative to the current one. It is also estimated that the average annual and average second volumes of environmental flows should be about 38 % of the respective river runoff. The obtained results are close to those found on rivers in China, Iran and the United States in the framework of a comprehensive analysis of hydrological, hydraulic and hydrobiological parameters of the aquatic ecosystem
Determining the effect of fuzziness in the parameters of a linear dynamic system on its stability
Authors: Horbiychuk Mykhailo , Lazoriv Nataliia , Feshanych Lidiia 
Published: May 2021

This paper considers a relevant issue related to the influence exerted by the fuzziness in linear dynamic system parameters on its stability. It is known that the properties of automated control systems can change under the influence of parametric disturbances. To describe the change in such properties of the system, the concept of roughness is used.
It should be noted that taking into consideration the fuzziness in the parameters of mathematical models could make it possible at the design stage to assess all the risks that may arise as a result of an uncontrolled change in the parameters of dynamic systems during their operation. To prevent negative consequences due to variance in the parameters of mathematical models, automated control systems are designed on the basis of the requirement for ensuring a certain margin of stability of the system in terms of its amplitude and phase. At the same time, it remains an open question whether such a system would satisfy the conditions of roughness.
Parameters of the mathematical model of a system are considered as fuzzy quantities that have a triangular membership function. This function is inconvenient for practical use, so it is approximated by the Gaussian function. That has made it possible to obtain formulas for calculating the characteristic polynomial and the transfer function of the open system, taking into consideration the fuzziness of their parameters.
When investigating the system according to Mikhailov’s criterion, it was established that the dynamic system retains stability in the case when the parameters of the characteristic equation are considered as fuzzy quantities. It has been determined that the quality of the system significantly deteriorated in terms of its stability that could make it enter a non-steady state. When using the Nyquist criterion, it was established that taking into consideration the fuzziness in the parameters of the transfer function did not affect the stability of the closed system but there was a noticeable decrease in the system stability reserve both in terms of phase and amplitude. The relative decrease in the margin of stability for amplitude was 16 %, and for phase ‒ 17.4 %.
Determining changes in the temperature field of a graphitized hollow electrode during metal processing periods in ladle-furnace
Authors: Ruban Volodymyr , Stoianov Oleksandr , Niziaiev Kostiantyn , Synehin Yevhen 
Published: May 2021

This paper reports an analysis of the process of heating a graphitized hollow electrode (GHE) during steel processing in ladle-furnace. The results of the numerical modeling of electrode operation are given. The data on the temperature field of the electrode were obtained when electricity was supplied and during periods without electrical loading. Values of the Joule heat released at electrode operation during the periods of metal heating in ladle-furnace were calculated; they amounted to 1.11–1.15 MW/m3. Coefficients of the heat transfer by convection have been calculated for the inner and outer GHE surface: 1.60 and 1.80, and 5–17 W/(m2∙°C), respectively. Values of the electrode temperature gradient in the high-temperature zone were obtained, which, for the first heating period, reached 8,286 °C/m, for the third ‒ to 6,571 °C/m. It was established that during the cooling periods of the electrode, the temperature gradient is significantly reduced and amounts to the inner surface of 379 °C/m; to the outer surface ‒ 3,613 °C/m; the vertical plane to the end of the electrode ‒ 1,469 °C/m. The directions to improve the installation’s thermal work and reduce its resource intensity during out-of-furnace processing of steel have been defined.
It has been determined that during the periods of electrode operation with current supply, significant values of the temperature gradient are observed, which are concentrated in the end part. During the periods of operation without current supply, a locally overheated zone forms, taking the shape of a torus flattened along the axis, which is created as a result of the accumulation of heat from the preceding period. The data have been acquired on the effect exerted by the gas supply through a hollow electrode on the parameters of formation of the high-temperature GHE regions. It has been shown that the supply of neutral gas through a graphitized hollow electrode at a flow rate of 0.05 m3/min shifts the high-temperature zone to the periphery by 3.5–4.2 mm, as well as reduces its height by 1.0–1.2 mm.
The study reported here could make it possible to calculate expedient gas and material consumption for controlling the oxidation of metal and slag, to reduce the consumption of graphitized electrodes, to bring down energy- and resource costs for metal production
The structural analysis of government expenditures on the purchase of antituberculous drugs
Authors: Korzh Iuliia , Romanko Tatyana , Volkova Alina , Tereshсhenko Lubov 
Published: May 2021

The aim. To conduct a structural analysis of the volume of government spending on the purchase of antituberculosis drugs (anti-TB D) within 2014–2018.
Materials and methods. In the study, we used information on public procurement of anti-TB D for 2014–2018 presented on the website of the Ministry of Health of Ukraine in the section “Procurement of Medicines”, as well as statistical data of the “Center for Public Health of the Ministry of Health of Ukraine” on the incidence of multi-drug resistant tuberculosis (MDR-TB) in the population.
Analytical and comparative, system, and logical methods, as well as economic analysis were used. With the help of synthesis the conclusions and recommendations were formed.
Results. It was found that in 2014-2018, the MDR-TB incidence rate increase had a positive dynamics in reducing the number of registered cases. For example, in 2015 this indicator was 2.56 %, and in 2018 it was -7.93 %.
It was proven that public procurement of anti-TB D in physical terms was chaotic. Thus, in 2015/2014, the growth rate of anti-TB D number was 35.55 %, in 2016/2015 – -31.59 %, in 2017/2016 – 15.31 %, in 2018/2017 – 6.13 %. It was found that the dynamics of the growth rate of purchases of TB D in the national currency and USD had some differences. For example, in 2015, expenses increased by 55.02 % in the national currency, while in dollar terms this indicator decreased by 15.64 % compared to 2014. At the same time, in 2018 there was a positive trend of increasing the volume of public spending in monetary terms. Thus, in 2018, the growth rate in the national currency was 53.16 %, and in USD – 49.83 %.
It was found that in the structure of public spending there was a tendency for an insignificant predominance of foreign anti-TB D. Based on the comparative analysis of government spending on groups of anti-TB D by the priority of their use in treatment regimens according to the standards it was determined that the process of anti-TB D purchasing did not meet the priority criteria for treatment. It complicates the implementation of the process of reforming TB care in connection with the construction of an outpatient model.
Wound healing effect of “Prolidoxid” and “Dexpanthenol with ceramides”: a сomparative study based on the model of chemical burns with expressed alterative skin processes
Authors: Butko Yaroslava , Tkachova Oksana , Tishakova Tetyana , Gordienko Anatoly , Bondariev Yevhen 
Published: May 2021

Pharmacotherapy of chemical skin injuries remains an urgent issue today due to its serious health consequences and possible development of complications. Topical treatment is one of the most effective methods of wound treatment using hydrophilic ointments and creams. For now, range of hydrophilic medicinal products with a broad spectrum of action is limited. That is why a search and development of new hydrophilic ointments and creams remains an urgent challenge.
The aim. The aim of this research was to study effectiveness of ointment “Prolidoxid” and cream “Dexpanthenol with ceramides” on the experimental chemical burn model in rats.
Materials and methods. Wound healing effect of ointment “Prolidoxid” and cream “Dexpanthenol with ceramides” was proved by the study of planimetric and hematological parameters on the model of acetic acid burns in rats.
Results. Using animal model of chemical burns it was found that ointment “Prolidoxid” and cream “Dexpanthenol with ceramides” accelerate wound healing on Day 5 and Day 6, consequently, compared to untreated control animals, but in comparison with the action of reference medicine wounds were healed two days faster. Hematological parameters showed that studied medicines inhibit inflammation and reactivate blood rheological properties.
Conclusions. The results suggest that effectiveness of cream “Dexpanthenol with ceramides” is higher than for one-component cream “Dexpanthenol”, but ointment “Prolidoxid” exceeds therapeutic action of ointment “Wundahyl” as reported by hematological and planimetric parameters