bluuebunny/crossref_metadata_2025_split huggingface dataset:
Building a mathematical model of technological processes in the acetic acid synthesis reactor
Authors: Samojlova Zhanna 
Published: November 2021

The result of the study reported in this paper is the proposed mathematical model of technological processes occurring in the reactor for acetic acid synthesis. The initial parameters of the reactor considered were the value of the concentration of acetic acid at the reactor outlet, temperature, the level of reaction mass, and pressure in the reactor. The input parameters included the amount of methanol and carbon monoxide supplied. Material and thermal balances of reactor technological processes were used to construct the mathematical model of the reactor. Fisher criterion was applied to test the mathematical model for adequacy. At the specified 5 % level of significance, the value of Fisher criterion for the concentration of acetic acid, temperature, and the level of reaction mass in the reactor does not exceed its critical value for a stationary mode. The reproducibility of the modeling results was tested using the Cochran criterion. The value of the Cochrane criterion, at the predefined 5 % level of significance, for the concentration of acetic acid, temperature, and the level of reaction mass in the reactor does not exceed its critical value for different modes. The relative error for the modeled output parameters was calculated. The relative error of the initial parameters did not exceed the level of 10 %. The model built makes it possible to calculate with satisfactory accuracy the value of the concentration of acetic acid at the reactor output, the temperature and level of the reaction mass in the reactor under a stationary mode. The resulting model could be used to automate the control of technological processes in the acetic acid synthesis reactor under a stationary mode. The study results open additional opportunities to manage the stationary mode of the reactor
Determining patterns in reducing the level of bio-destruction of thermally modified timber after applying protective coatings
Authors: Tsapko Yuriy , Horbachova Oleksandra , Mazurchuk Serhii , Tsapko Аleksii , Sokolenko Kostiantyn , Matviichuk Andrii 
Published: November 2021

This paper reports the analysis of the biological destruction of timber and the use of protective materials, which established that the scarcity of data to explain and describe the process of bioprotection, neglect of environmentally friendly agents lead to the biodegradation of timber structures under the action of microorganisms. Devising reliable methods for studying the conditions of timber protection leads to designing new types of protective materials and application technologies. Therefore, it becomes necessary to determine the conditions for the formation of a barrier for bacteria permeability and to establish a mechanism for inhibiting material biodegradation. Given this, the dependence has been derived to determine the proportion of destroyed material under the effect of microorganisms when using an antiseptic-hydrophobicizer, which makes it possible to evaluate biopenetration. Based on the experimental data and theoretical dependences, the share of destroyed timber was determined under the effect of microorganisms, which is equal to 1 for natural timber. At the same time, this value for thermally modified timber is 0.033, and, when it is protected with oil ‒ 0.009, respectively, exposed to the action of microorganisms for 60 days. It should be noted that the presence of oil, wax, and azure leads to blocking the timber surface from penetration. Such a mechanism underlying the effect of protective coating is likely the factor in the process adjustment, due to which the integrity of the object is preserved. Thus, a polymer shell was created on the surface of the sample, significantly reducing the penetration of microorganisms inside the timber, while the loss of timber mass during biodestruction did not exceed 2.5 %. Therefore, there are grounds to assert the possibility of targeted control over the processes of timber bio-penetration by using coatings capable of forming a protective film on the surface of the material
Determining the speed and acceleration of the separator for grass leaf part in horizontal and vertical directions
Authors: Abilzhanuly Tokhtar , Keshuov Seitkazy , Rzaliyev Askar , Zhortuylov Omirserik , Zhumatay Gani , Abilzhanov Daniyar , Karmanov Darkhan , Boranbayev Bauyrzhan 
Published: November 2021

Vitamin-grass flour is the main component of mixed fodders intended for all types of livestock and poultry. Earlier and currently, the vitamin-grass flour has been prepared from legumes by a high-temperature drying technique. However, existing techniques have high operating costs and require very expensive technical tools.
To reduce the specific operating costs and the price of equipment in the production of VGF, a technique has been proposed that involves the main drying of grass to a moisture content of 30‒35 % on a swath while the post-drying of grass is performed in a small-sized channel under the haystack without air heating. Next, the dried mass is pre-crushed. At the same time, the delicate leaf part of the hay, while falling between the side walls of hammers and counter-hammers, is ground and finely crushed, and the stems are processed into large fractions. From pre-crushed hay, the leaf part is separated and fed into the crusher to produce flour.
In this case, the main machine that determines the performance of the line is the separator of the leaf part of the grass.
The results of the theoretical research have established the speed and acceleration of hay movement on the surface of the sieve. These values determine the productivity of separation of the leaf part from pre-crushed hay and the reliability of the selected structural and technological scheme of the separator. The production tests have confirmed the reliability and economic efficiency of the proposed technique. Comparing the proposed technique for obtaining vitamin-grass flour by existing high-temperature methods has shown that the carotene content in flour was 1.6 times higher while the specific operating costs and equipment price were 6‒7 times lower
Designing capacitive deionization module for water treatment systems at car washers
Authors: Kudin Dmytro , Taran Grigoriy , Bazhynov Olexiy , Kravtsov Mikhail 
Published: November 2021

It is impossible to effectively use water with a high salt content at car washes. In many places, access to water with a high salt content is almost unlimited but its utilization requires deionization. For this purpose, several methods are used, the main of which are reverse osmosis, electrodialysis, ion exchange methods, and distillation. However, they have significant drawbacks. Recently, the technology of capacitive deionization of water has been widely used, based on the removal of salt ions from the solution during the charge/discharge of "double" electric layers of carbon materials with a significant active surface (800‒2,000 m2/g). Theoretically, this process should be more energy efficient by using a low potential voltage (1–2 V). This paper considers the interrelation of physical parameters that affect the process of capacitive deionization of water. The dependences of voltage drop on serial internal resistance on different concentrations of sodium chloride and the distance between electrodes for electrodes based on the material SAUT-1S (Belarus) have been investigated. It is shown that the main contribution to the sequential internal resistance is introduced by the resistance of the electrolyte. As the distance between the electrodes increases, the voltage drop on the serial internal resistance increases linearly. A decrease in the concentration of ions leads to a decrease in the conductivity of the solution, which causes an increase in energy consumption and a decrease in the efficiency of sorption. It has been demonstrated that the voltage drop at the serial internal resistance when the voltage on the electrodes is limited, which is set in order to avoid the transition of the electrode charging mode to the electrolysis of water, causes a significant drop in the efficiency of the capacitive deionization process
Development of doctrinal model for state financial security management and forecasting its level
Authors: Poltorak Anastasiia , Potryvaieva Natalia , Kuzoma Vitalii , Volosyuk Yuriy , Bobrovska Nadia 
Published: November 2021

A doctrinal model of state financial security management in the context of globalization changes has been developed. The model is formed at five levels (doctrinal, conceptual, strategic, programmatic, planned), contains a logical continuum of mission, priorities in the financial sector and the level of technological innovation, influencing factors and a system of actions aimed at achieving goals. This model accumulates a set of solutions aimed at adapting to transformational processes in the economy associated with new needs of states, globalization processes in the world financial space, technology development, new challenges and threats.
As a result of the study, forecasting is carried out and the effectiveness of the results of modifying approaches to managing the financial security of the state using a polynomial algorithm for extrapolating the parameters of stochastic systems is proved. A polynomial correlation-regression model is presented, the input data of which were specific indicators of the effectiveness of innovative development of the state, perception of corruption and debt dependence. In fact, this is a set of those indicators at which the strategic directions of strengthening the financial security of the state are directed in the context of globalization changes.
The generalized values of the state of financial security of the state, determined on the basis of the developed polynomial correlation-regression model, are obtained, as well as the absolute and relative amounts of error indicate the accuracy of the forecasts obtained. So, the mean level of error is 0.005 %, which means that the totality of these indicators can characterize the state of financial security of the state. Accordingly, this model is useful in the process of predicting the results of modifying approaches to the formation of the financial security of the state
Improvement of the model of object recognition in aero photographs using deep convolutional neural networks
Authors: Slyusar Vadym , Protsenko Mykhailo , Chernukha Anton , Kovalov Pavlo , Borodych Pavlo , Shevchenko Serhii , Chernikov Oleksandr , Vazhynskyi Serhii , Bogatov Oleg , Khrustalev Kirill 
Published: November 2021

Detection and recognition of objects in images is the main problem to be solved by computer vision systems. As part of solving this problem, the model of object recognition in aerial photographs taken from unmanned aerial vehicles has been improved. A study of object recognition in aerial photographs using deep convolutional neural networks has been carried out. Analysis of possible implementations showed that the AlexNet 2012 model (Canada) trained on the ImageNet image set (China) is most suitable for this problem solution. This model was used as a basic one. The object recognition error for this model with the use of the ImageNet test set of images amounted to 15 %. To solve the problem of improving the effectiveness of object recognition in aerial photographs for 10 classes of images, the final fully connected layer was modified by rejection from 1,000 to 10 neurons and additional two-stage training of the resulting model. Additional training was carried out with a set of images prepared from aerial photographs at stage 1 and with a set of VisDrone 2021 (China) images at stage 2. Optimal training parameters were selected: speed (step) (0.0001), number of epochs (100). As a result, a new model under the proposed name of AlexVisDrone was obtained.
The effectiveness of the proposed model was checked with a test set of 100 images for each class (the total number of classes was 10). Accuracy and sensitivity were chosen as the main indicators of the model effectiveness. As a result, an increase in recognition accuracy from 7 % (for images from aerial photographs) to 9 % (for the VisDrone 2021 set) was obtained which has indicated that the choice of neural network architecture and training parameters was correct. The use of the proposed model makes it possible to automate the process of object recognition in aerial photographs.
In the future, it is advisable to use this model at ground stations of unmanned aerial vehicle complex control when processing aerial photographs taken from unmanned aerial vehicles, in robotic systems, in video surveillance complexes and when designing unmanned vehicle systems
Determination of productivity of milking cows and emissions of greenhouse gases from organic waste with different approaches to the organization of the technology of their feeding
Authors: Zolotarov Andriy , Piskun Viktor , Pilipcenko Angrej , Rudenko Evqen , Zolotarova Svitlana , Trishin Aleksei , Yatsenko Yuriy 
Published: November 2021

The analysis of approaches to reduce the consumption of fodder protein and greenhouse gas emissions from organic waste in milk production is carried out, and the need to determine these indicators for various approaches to organizing the technology of their feeding is established.
An increase in the content of difficult-to-digest protein in the diets of high-yielding cows made it possible to reduce greenhouse gas emissions per head per day by 14.12 % in CO2 equivalent when using 1.5 kg of TEP-mix in the ration of cows. When using 1.0 kg of TEP-mix, this figure was 6.44 %. In terms of 1 kg of milk with basic fat content, these indicators are 26.72 % and 12.98 %, respectively.
A multicriteria analysis of milk production with different approaches to organizing the technology of feeding dairy cows and, in particular, when using the additive TEP-mix with a protected protein showed a significant advantage of research option No. 1 (1.5 kg of TEP-mix). For it, the objective function according to the considered criteria is the smallest and amounts to 0.039 in comparison with the idealized variant. At the same time, the target function of the control variant (without TEP-mix) is 2.67 times worse, and for the experimental variant No. 2 (1.0 kg of TEP-mix) this indicator is 2.12.
The use of TEP-mix in feeding cows provided an increase in their milk productivity, milk fat and protein content and, as a result, the profitability of milk production.
The studies have found that the use of the proposed approaches to the organization of the technology of feeding cows provides an increase in their productivity, a decrease in the cost of feed protein and an improvement in environmental protection. According to the authors, this is due to an increase in the content of difficult-to-digest protein in the diets of high-yielding cows
Development of a method for targeted financing of economy sectors through capital investment in the innovative development
Authors: Levchenko Iaroslava , Losonczi Peter , Britchenko Igor , Vazov Radostin , Zaiats Olga , Volodavchyk Viktoriia , Humeniuk Iryna , Shumilo Oleksii 
Published: November 2021

The problem of targeted financing of economic sectors is considered. The method of targeted financing of sectors of the economy through investment in innovative development is proposed. On the basis of statistical data on the performance indicators of the sectors of the economy, the calculation of indicators of their innovative potential was carried out, based on the volume of sold innovative products (goods, services) by type of economic activity. In order to stimulate sectors of the economy by investing in innovative development, it is proposed to introduce targeted financing of the latter. The problem of quantitative assessment of targeted financing of economic sectors by means of investment in innovative development based on an integrated approach has been solved. According to the results obtained, sectors of the economy that are identified as the most risky and have the potential for innovative development fall under targeted financing.
The proposed technique was tested by an experimental method. On the basis of an integrated approach for the indicators of the riskiness of the economic sector and the indicator of the innovative potential of the economic sector, targeted financing for 3 sectors of the economy (namely: P, N, M, L and J) was determined. Sector P will receive more targeted funding, while sectors N, M, L and J will receive less targeted funding, respectively. The size of these parts will be 47.30 %, 22.31 %, 13.48 %, 9.56 % and 7.34 %, respectively, of 100 % S.
The results of the study are of practical interest for government bodies (local, territorial, etc.) in the distribution of funds according to the vector of targeted financing of sectors of the economy through investment in innovative development. Practically valuable for researchers who deal with issues of financial security, targeted financing and public administration
Determination of the effect of thickness reduction ratio, die angle, and coefficient of friction on residual stresses in ironing process: an analysis using computer simulation
Authors: Faizin Akhmad , I Made Londen Batan , Pramono Agus Sigit , Wahjudi Arif 
Published: November 2021

Ironing is a part of the group of metal forming processes, the process of reducing the thickness of the wall of a cup-shaped product. External load required to process metal forming, can cause residual stress. Residual stress can be beneficial or detrimental depending on the function of the product, the magnitude, and direction of the residual stress. Residual stress can act as an additional load on a given load. Residual stress can affect product quality, namely: dimensional accuracy, surface roughness, and mechanical properties. The speed of the ironing process is strongly influenced by the mechanical properties of the cup material, Thickness Reduction Ratio (TRR), and press tool design. The ironing process has a limited TRR value and if it is exceeded it results in product damage. Various studies on ironing were carried out to obtain an optimal process. In this research, stress analysis was carried out using the ANSYS software modeling simulation to obtain the occurring residual stress during the ironing process. The analysis was carried out by varying the TRR from 20 % to 30 %, the die angle from 25° to 30°, and the coefficient of friction from 0.05 to 0.15. Furthermore, processing and analysis of the stress analysis data are carried out to obtain the most dominant variables affecting the residual stress and the variable value that produces the lowest residual stress. Stress analysis was carried out on AA1100 aluminum cups with an outer diameter of 37 mm, a height of 20 mm, and a wall thickness of 2 mm. The results show that TRR and coefficient of friction are the most dominant variables affecting residual stress, while die angle has no significant effect. The lowest residual stress occurs at TRR 30 % and coefficient of friction 0.15
Structural modification of ciprofloxacin and norfloxacin for searching new antibiotics to combat drug-resistant bacteria
Authors: Hryhoriv Halyna , Mariutsa Illia , Kovalenko Sergiy M. , Sidorenko Lyudmila , Perekhoda Lina , Filimonova Nataliia , Geyderikh Olga , Georgiyants Victoriya 
Published: November 2021

The aim of the work. Among all the representatives of four generations of fluoroquinolones ciprofloxacin (CIPRO) and norfloxacin (NOR) remain widely used and prescribed antibiotics in clinical practice. However, the problem of resistance towards them is gradually increasing. Thus, our investigation is dedicated to chemical modification of C-7 position of Ciprofloxacin and Norfloxacin ring as a promising solution to combat antibiotic resistance and open a pathway towards convenient synthesis of new fluoroquinolones derivatives.
Materials and methods. The subjects of the research were N-piperazine-substituted ciprofloxacin and norfloxacin. The methods of molecular docking and organic synthesis were applied in the study. The structures of the obtained compounds were confirmed by 1H NMR, 13C NMR, 19F NMR, LC/MS, IR, UV spectroscopy. The antimicrobial activity was measured by the method of double serial dilutions against Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), Bacillus subtilis (ATCC 6633), Pseudomonas aeruginosa (ATCC 27853), Candida albicans (NCTC 885-653) and diffusion in agar method against clinical strains.
The results. 7-(4-(2-Cyanoacetyl)piperazin-1-yl)-1-R-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acids were synthesized and their structures were confirmed. The obtained compounds showed the antibacterial activity on the reference level for double dilution method and exceeded control for “well” method.
Conclusions. The current investigation revealed the promising route for the expanding of the existing fluoroquinolones diversity. Pharmacodynamics and pharmacokinetics changes could be achieved by chemical modifications of C-7 position of the initial ring. Further research utilizing the obtained compounds as starting ones opens a promising way to novel active molecules synthesis and combating the problem of antibiotic resistance
Comparative pharmakognostical study of roots of Rosa Majalis Herrm. and Rosa Canina L.
Authors: Oproshanska Tetiana , Khvorost Olga , Skrebtsova Kateryna , Vitkevicius Konradas 
Published: November 2021

The aim is to conduct a comparative pharmacognostical study of the series of roots of Rosa (R.) majalis Herrm. and Rosa (R.) canina L. with the establishment of diagnostic features of morphological and anatomical structure and boundary limits of numerical indicators of raw materials.
Materials and methods. The fresh and dry raw materials were used to study the macroscopic microscopic features by microscope Delta optical BioLight 300 (Poland). Determination of total polyphenols was performed by spectrophotometry (on a spectrophotometer Optizen POP (Korea)) and HPLC (chromatograph an Agilent 1200 3 D LC System Technologies (USA)).
Results. The morphological (nature of the surface (periderm) and fracture) and anatomical (color of cell walls and their cavities; location of the sclerenchyma; the presence of a crystalline coating of the sclerenchyma at the root of R. canina; of various elements of the remains of the tetraarchic conducting bundle in the center of the root) diagnostical features of roots of R. majalis and R. Canina were established.
Comparing the numerical values of loss on drying (not more than 10 %), total ash (not more than 5 %), extractable matter (not less than 9 %) and the quantitative content of total polyphenols (not less than 4 %) it was determined that both types of raw materials according to these indicators are almost indistinguishable.
Conclusions. Loss on drying, total ash, extractable matter and content of total polyphenols of the root of R. majalis and R. canina do not have significant differences, that is why the root of both plant species can be used as medicinal plant raw materials such as “Rose root”. The obtained data will be used in further research when creating methods of quality control of plant raw materials and phytomedicines