bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of metal wool on the charging and discharging rate of the phase transition thermal storage material
Authors: Khliyeva Olga , Zhelezny Vitaly , Paskal Aleksey , Hlek Yana , Ivchenko Dmytro 
Published: September 2021

Thermal energy storage (TES) plays an important role in solar heat power systems. The use of phase change materials (PCM) and selecting additives to increase the rate of heat accumulation is a promising way to increase the efficiency and reliability of such systems.
The objects of the study were pure paraffin wax (PW) and composite PCMs based on it (containing aluminum and copper wool of 30 and 45 μm in diameter, respectively).
An experimental setup with a cylindrical measuring cell was created, which was also considered as a model of a capsule with a thermal storage material. The rate of temperature change in the pure PW sample and samples of composite PCMs was experimentally measured. Two modes of heating and cooling were investigated: from 48 to 59 °C (mode with a phase change) and from 30 to 40 °C (mode without phase changes).
Heating time from 48 to 59 °C for the PW sample was 13 min., for the PW samples with the content of aluminum wool of 0.00588 and 0.01780 m3·m-3 − 11 and 10.5 min., for the PW samples with the content of copper wool of 0.00524 and 0.01380 m3·m-3 − 11 and 8 min., correspondingly. The minimum heating time from 30 to 40 °C was 6 min. for the sample of PW with 0.01380 m3·m-3 of copper wool in comparison with 9 min. for the sample of pure PW.
The expediency of using copper wool as an additive to thermal storage materials of PW to increase the charging and discharging rate of TES devices without significantly raising their price was confirmed. The presence of metal wool in molten PW suppresses bottom-up convective currents, so the main mechanism of heat transfer is thermal conductivity. This fact will contribute to a faster equalization of the temperature field by the height of heat storage capsules
Development and experimental study of analyzer to enhance maritime safety
Authors: Nosov Pavlo , Zinchenko Serhii , Plokhikh Viktor , Popovych Ihor , Prokopchuk Yurii , Makarchuk Dmytro , Mamenko Pavlo , Moiseienko Vladyslav , Ben Andrii 
Published: September 2021

On the basis of empirical experimental data, relationships were identified indicating the influence of navigators' response to such vessel control indicators as maneuverability and safety. This formed a hypothesis about a non-random connection between the navigator's actions, response and parameters of maritime transport management.
Within the framework of this hypothesis, logical-formal approaches were proposed that allow using server data of both maritime simulators and operating vessels in order to timely identify the occurrence of a critical situation with possible catastrophic consequences.
A method for processing navigation data based on the analysis of temporal zones is proposed, which made it possible to prevent manifestations of reduced efficiency of maritime transport management by 22.5 %. Based on cluster analysis and automated neural networks, it was possible to identify temporary vessel control fragments and classify them by the level of danger. At the same time, the neural network test error was only 3.1 %, and the learning error was 3.8 %, which ensures the high quality of simulation results.
The proposed approaches were tested using the Navi Trainer 5000 navigation simulator (Wärtsilä Corporation, Finland). The simulation of the system for identifying critical situations in maritime transport management made it possible to reduce the probability of catastrophic situations by 13.5 %. The use of automated artificial neural networks allowed defining critical situations in real time from the database of maritime transport management on the captain's bridge for an individual navigator.
Implementation of the method of figurative transformations to minimizing symmetric Boolean functions
Authors: Solomko Mykhailo , Tadeyev Petro , Zubyk Liudmyla , Babych Stepaniia , Mala Yuliia , Voitovych Oksana 
Published: September 2021

This paper reports a study that has established the possibility of improving the effectiveness of the method of figurative transformations in order to minimize symmetrical Boolean functions in the main and polynomial bases. Prospective reserves in the analytical method were identified, such as simplification of polynomial function conjuncterms using the created equivalent transformations based on the method of inserting the same conjuncterms followed by the operation of super-gluing the variables.
The method of figurative transformations was extended to the process of minimizing the symmetrical Boolean functions with the help of algebra in terms of rules for simplifying the functions of the main and polynomial bases and developed equivalent transformations of conjuncterms. It was established that the simplification of symmetric Boolean functions by the method of figurative transformations is based on a flowchart with repetition, which is the actual truth table of the assigned function. This is a sufficient resource to minimize symmetrical Boolean functions that makes it possible to do without auxiliary objects, such as Karnaugh maps, cubes, etc.
The perfect normal form of symmetrical functions can be represented by binary matrices that would represent the terms of symmetrical Boolean functions and the OR or XOR operation for them.
The experimental study has confirmed that the method of figurative transformations that employs the 2-(n, b)-design, and 2-(n, x/b)-design combinatorial systems improves the efficiency of minimizing symmetrical Boolean functions. Compared to analogs, this makes it possible to enhance the productivity of minimizing symmetrical Boolean functions by 100‒200 %.
There are grounds to assert the possibility of improving the effectiveness of minimizing symmetrical Boolean functions in the main and polynomial bases by the method of figurative transformations. This is ensured, in particular, by using the developed equivalent transformations of polynomial function conjuncterms based on the method of inserting similar conjuncterms followed by the operation of super-gluing the variables.
Defining features in the kinetics of sodium carbonate-bicarbonate solution carbonization and the quality of the resulting sodium bicarbonate crystals
Authors: Porokhnia Mykola , Tseitlin Musii , Bukhkalo Svitlana , Panasenko Vladimir , Novozhylova Tetiana 
Published: September 2021

This paper reports a study into the influence of temperature and gas consumption on the carbonization kinetics (saturation with carbon dioxide) of sodium carbonate-bicarbonate solution. The study also examined the quality and speed of crystal formation in this process. This research is predetermined by the environmental problems faced by modern enterprises that produce purified sodium bicarbonate – an insufficient degree of carbonization and, as a result, excessive air pollution with carbon dioxide, which did not participate in the reaction during the process. This study addresses these particular issues. As a result of using specialized laboratory equipment, it was found that an increase in the absorbent temperature from 79 to 85 °C leads to a decrease in the maximum degree of carbonization of the solution from 64 to 59 %. In contrast, the quality of the resulting sodium bicarbonate crystals improves but only in the range from 79 to 82 °C. With a further increase in temperature, the quality stabilizes. It is shown that the carbonization rate increases with increasing specific consumption of the absorbent (carbon dioxide) and is characterized by a negative correlation with the value of oversaturation of the absorbent in terms of NaНCO3. The quality of sodium bicarbonate crystals decreases with increasing gas velocity. Thus, it was reasonable to assume that the established dependence of the kinetics of carbonization of Na2CO3 and NaНCO3 solution on the gas velocity in the apparatus is explained by the inhibition of СО2 absorption, which is caused by the diffusion resistance of sodium bicarbonate crystallization. To improve the quality of crystals and the productivity of carbonization by reducing the supersaturation in terms of NaНCO3, it is recommended to introduce a seed crystal in the zone of binding of crystals in the carbonization columns.
Design of solid oxide structure on the composite cathode for IT-SOFC
Authors: Kamal Dianta Mustofa , Susanto Iwan , Subarkah Rahmat , Zainuri Fuad , Zainuri Belyamin , Rahmiati Tia , Permana Sulaksana , Subardi Adi , Fu Yen-Pei 
Published: September 2021

Solid oxide structure of the cobalt-free composite has been exploited as a new cathode material for IT-SOFCs. The composite model system was synthesized using the metallic oxide material, which was formed by a solid-state reaction technique. The generation of the Sm0.5Sr0.25Ba0.25FeO3-δ (SSBF) model system was carried out during the sintering process. The weight loss and oxygen content were investigated by thermal gravimetric analysis (TG). Meanwhile, X-ray diffraction characterized the structure of the composite and thermal conductivity tested the conductivity properties. The results showed that the structure of the SSBF composite demonstrated the perovskite single phase leading to the structural design. The decomposition and evaporation of the constituent elements of the composite corresponded to weight losses during the constructing process. The oxygen content of the model system was 2.98 after the calcination process. The electrical conductivity value reached 2 S cm-1 at 400 °C and increases to a maximum of 7.5 S cm-1 at 710 °C. The metallic element played to generating the conductive behavior at the low temperature, while the ionic structure acted as elevated temperature. So, mixed ionic and electric conductors (MIEC) were employed comprehensively for creating the conductive properties. Based on the structure and conductivity results, the SSBF composite has a good chance as an alternative cathode material with a perovskite single phase for future TI-SOFCs applications
Economic assessment of sources of investment in the development of municipal electric transport enterprises
Authors: Illiashenko Olena , Kondratenko Natalia 
Published: September 2021

The organizational and economic foundations for the formation of an investment strategy for the development of urban electric transport enterprises have been developed. The economic content of the main stages of the investment process at these enterprises has been clarified. A list of basic principles for the effective formation of the investment process has been compiled. It is proved that the enterprises of urban electric transport in Ukraine are currently unprofitable and the problems of investment support for them are extremely relevant and important.
The main directions of the development of investment activity of urban electric transport enterprises have been investigated and strategic, tactical and operational methods of its activation have been proposed. At the same time, there are three main aspects of enhancing investment activity: investment, innovation and technological.
The main provisions of the strategy of attracting investment sources by urban electric transport enterprises have been developed, which allows ensuring the required level of investment flexibility of the enterprise and independence in obtaining investment resources from various sources. The main stages of this process have been identified and substantiated, which include: the time of action, the formation of strategic goals, the algorithm for selecting and justifying the sources of investment resources and the practical implementation of the investment strategy. The practical aspects of rating sources of investment resources have been investigated, taking into account risk factors, time of use, investment prices, the ability of an enterprise and the state to influence the formation and use of investment sources. An integral indicator has been determined for each of the possible sources of investment resources, according to which the most acceptable for urban electric transport enterprises in terms of the cost of attracting and the likelihood of risk occurrence are own funds (32 points), as well as state budget funds (22 points) and local budgets (21 points). Practical recommendations on the use of the developed provisions have been formed
Analysis of intercity bus public transport safety perception modeling using conjoint
Authors: Suraji Aji , Djakfar Ludfi , Wicaksono Achmad , Marjono Marjono , Putranto Leksmono Suryo , Susilo Sugeng Hadi 
Published: September 2021

Public transport safety is still an issue that needs to be studied by bureaucrats and researchers. This is because public bus accidents are still quite high. This is because many families, involved in traffic accidents, are shocked by the accident. Therefore, the problem of perception of a safe bus needs to be studied. The purpose of this study was to determine the perception model of a safe public bus. Mathematical modeling based on the parameters that have been studied was selected first. While the second objective was to determine the importance value of the parameters that are an indication of the perception of the safety of intercity bus public transportation. This research is a type of perceptual one where the data is taken from the relevant respondents. The method of data collection was carried out using a questionnaire with respondents from bus company owners, drivers, and passengers in the province of East Java, Indonesia. Respondents were asked to answer questions related to the variables of income, speed, comfort, and safety. The method of conjoint analysis is used. The first stage is the result of modeling the perception of a safe bus. Further analysis is carried out to obtain the importance value of the parameters. The result of this research is a utility model for the perception of a safe bus, which is expressed by the equation U, where the variables include income, speed, comfort, and safety. The highest level of importance is income 33.29 %, followed by the security variable with a weight of 25.39 %. This shows that the income factor is a top priority for drivers and management of bus company owners, while road safety is second only to income. In other words, respondents' perceptions are more concerned with income, while safety is still a non-priority factor.
Peculiarities of disorders of nitrogen oxide system in the blood at adrenalin-induced myocardial injury in conditions of immobilization stress and their correction by L-arginine
Authors: Lys Oksana , Reheda Mykhailo , Sementsiv Nataliya , Reheda-Furdychko Mariana , Reheda Stepan 
Published: September 2021

The aim: of the study was to elucidate the changes to nitric oxide activity in the blood during adrenaline-induced myocardial injury under immobilization stress and to establish the corrective effect of L-arginine.
Methods: determination of free arginine was conducted by the method of Aleinikova T.L., total nitric oxide products in the blood by the method of Schmidt H.H., the total activity of nitric oxide synthase by the method of Sumbaiev V.V.. Immobilization stress was reproduced by the method of Horizontov P.D. Adrenaline-induced myocardial injury was reproduced by the method of Markova O.O. L-arginine was injected based on scientific data by Kiryanova N.A.
Results. Studies have shown that on days 1 and 3 with adrenaline-induced myocardial injury under immobilization stress there was an increase in nitric oxide products in the blood, respectively, according to control. The use of L-arginine on the 5th day, led to a decrease in levels of NO products in the blood by less than, lower against the group of animals with MI and IS, to treatment.
Conclusions. Thus, biochemical studies of NO system in the dynamics of IS and MI showed an increase in food content and total synthase activity of NO on the background of reduced levels of L-arginine, which were detected at all stages of the study and especially expressed on the 1st day before treatment. The use of the drug L-arginine, made it possible to identify its corrective effect on impaired metabolic processes in MI and IS
Theoretical study of the possibility of decamethoxin complexes with thiotriazolinе to be formed
Authors: Kucherenko Ludmila , Shishkina Svetlana , Chonka Elena 
Published: September 2021

Over the last decade, much attention has been paid to the prevention and treatment of chronic diseases of the oral mucosa.
This is primarily due to the increase in the number of patients who seek dental care for diseases of the oral mucosa (DOM).
Currently, due to the lack of special epidemiological studies, information on the pathology of the oral mucosa in the literature is almost non-existent. The etiology and pathogenesis have not been definitively elucidated. It is established that a significant role in the pathogenesis of chronic inflammatory processes belongs to the state of the microbiocenosis of the oral mucosa.
One of the most striking examples of domestic drugs of the antioxidant group is thiotriazoline, developed by the staff of the NGO “Pharmatron”, as well as specialists of the Department of Pharmaceutical Chemistry of Zaporozhye State Medical University under the leadership of professor Mazur I. A. This drug has an antioxidant and membrane-stabilizing effect.
The aim. The combined use of several drugs can be complicated by the formation of their supramolecular complexes. Therefore, before the introduction of several substances in it is necessary to model the possibility of intermolecular interactions between them. For this purpose, methods of quantum chemistry are used.
Material and methods. We examined the structures and energy characteristics of the complexes, formed thiotriazoline and decamethoxin, also carried out analysis and established at what temperature the formation of a substance from two active components was possible.
Results. As a result, the probability of the formation of intermolecular hydrogen bonds is reduced, which is very well seen in the trend of interactions between acid and morpholine.
Conclusions. Quantum chemical study of a two-component system consisting of thiotriazoline and decamethoxine showed that the most energetically advantageous three-component complexes have a sufficiently low interaction energy of thiotriazoline and decamethoxine. In addition, the data that are provided in the analysis of the tree diagram suggest that in the technological process in the manufacture of dosage forms, it is advisable to use a temperature not higher than 115℃.
Component composition of essential oil shoots and leaves of Laurus nobilis L. Ukrainian origian
Authors: Khvorost Olga , Posohova Irina , Fedchenkova Yuliia , Skrebtsova Kateryna 
Published: September 2021

The aim of our work was to carry out a comparative analysis of the essential oils of shoots and leaves of Laurus nobilis L. Ukrainian flora and to determine the prospects for their use in pharmacy.
Materials and methods. Raw materials for obtaining essential oil (shoots and leaves) of Laurus nobilis L. were harvested in November 2017 in the southern regions of Ukraine.
By the method of chromatography-mass spectrometry using an Agilent Technology 6890N chromatograph, the component composition of 4 samples of essential oil of Laurus nobilis L. raw material was investigated and identified.
The composition of the essential oil was identified by comparing the results with the data from the NIsT 02 mass spectra library (more than 174,000 substances).
Results. Thus, in the studied series of the essential oil of the shoots, a similarity was observed both in the set of components and in the relative content of a number of individual compounds and compounds of structurally related groups. The content in these samples was dominated by 1,8-cineole (19.63 % of the amount and 12.93 % of the amount, respectively), α-terpinyl acetate (16.22 % of the amount and 16.03 % of the amount, respectively).
In contrast to the series of the essential oil of the shoots, the component composition of the essential oil of the leaves of the two series was significantly different. In both studied series, only 3 compounds were identified that are common - these are aromatic compounds methyleugenol, trans-methylisoevgenol, and the sequiterpenoid caryophyllene oxide.
Conclusions. Thus, a comparative analysis of the component composition of biologically active substances in the essential oils of shoots and leaves of the Laurus nobilis L. Ukrainian harvest showed the prospects for further pharmacognostic research of this plant as a source of medicinal raw materials
Development of the desserts based on non-traditional vegetable raw materials
Authors: Vorobyova Anastasia , Polyovyk Volodymyr , Koretska Iryna 
Published: September 2021

Nowadays, the problem of healthy eating is acute. Most consumers prefer organic foods, dishes based on natural vegetables and fruits, and healthy nutrition. Thus, reducing calories content and increasing the nutritional value of sweet dishes is a promising area for the research. Therefore, the object of this study is the technology of whipped sweet «sambuk»-type dishes. To create the new desserts, non-traditional vegetable raw materials, namely physalis puree and banana puree, were chosen. Physico-chemical, mathematical, and dessert quality analysis methods were used in the study.
One of the most problematic tasks in the technology of whipped desserts is the stabilization of the foam structure. Therefore, the inclusion of physalis puree and banana puree in the recipe affects not only the organoleptic properties, but also improves the physical and chemical parameters of the dish. In particular, the aggregate stability coefficient of the foam increases to 4.33 in the samples with banana puree and to 3.48 in the samples with physalis puree, which is 2 and 1.66 times higher than the same indicator for control sample. The specific volume also has a noticeable improvement (it is 1.5 times higher in samples with physalis puree and 1.16 times higher in samples with banana puree comparing to control). During the study the effect of selected raw materials on the dry matter content in new desserts was determined (it ranges from 36.5 % to 41.3 5 % in samples with physalis puree and from 23.2 % to 27.8 % in the case of adding banana puree) . The acidity of the model samples ranges from 4.8 to 4.61 pH in desserts with physalis puree, and from 5.53 to 5.41 pH in desserts with banana puree. Based on the expert assessment, the value of the sample quality criteria was determined. Conclusions are made on the expediency of non-traditional raw materials using in the preparation of whipped desserts.