bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determining infrared radiation intensity characteristics for the exhaust manifold of gas turbine engine ТВ3-117 in МІ-8МSB-B helicopter
Authors: Kinashchuk Mykhailo , Kinashchuk Ihor 
Published: July 2024

The object of this study is the screen-exhaust device in the TV3-117 engine of the Mi-8MSB-B helicopter.
To reduce visibility in the thermal range, a system of mixing hot engine exhaust gases with ambient air is used; this technique makes it possible to reduce the infrared radiation of engines. For this purpose, a new sample of screen-exhaust device was designed for testing.
A thermal imaging survey of the helicopter was conducted. Three variants of thermal images were acquired: a helicopter without installation of a thermal visibility reduction system, a helicopter with standard exhaust shields installed, and a helicopter with newly developed shield exhaust devices installed. Based on the obtained experimental results, the characteristics of the intensity of infrared radiation were determined for three variants of research in the range of thermal waves of 3–5 μm. The study uses a comprehensive approach to solving the tasks, which includes a statistical analysis of known and promising ways to protect a helicopter from guided missiles with infrared homing heads based on reduced radiation forces and a theoretical method for calculating flow and temperature fields. The advantages of placing the section of the exhaust channel of the designed screen-exhaust device in the horizontal plane for complete shielding of infrared radiation in the lower hemisphere have been experimentally proven. The benefits of directing the flow of exhaust gases from the screen-exhaust device into the space above the helicopter propeller and dividing this flow into four separate flows were shown. The results of experimental research could be used to design new or improve existing screen-exhaust devices by the developers of military aviation
Identifying patterns in loading a gondola car body with reinforcing belts in the structure of side walls
Authors: Lovska Alyona , Stanovskyi Oleksandr , Zharova Oksana , Naumenko Yevheniia , Pelypenko Yevhen 
Published: July 2024

The object of this study is the processes of occurrence, perception, and redistribution of loads in the body of a gondola car with reinforcing belts in the structure of side walls.
In order to improve the strength of side walls of the gondola car body, it is proposed to strengthen them with additional belts. At the same time, it is reinforced with diagonal belts in three sections of the body on the side of the consoles, and in the middle section, 1/3 of the height from the lower strapping, with a horizontal belt. To determine the parameters for the execution of profiles in the reinforcing belts, the calculation of the gondola car body as a rod system was carried out. Based on the resulting values of bending moments, the moment of resistance of the cross-section of the profiles of the reinforcing belts was determined. The calculation of the strength of the body of the gondola car under the main modes of its loads in operation (I and III calculation modes) was carried out. It was found that the resulting stresses were 10.3 % lower than those occurring in a typical design of a gondola car body. The movement of the gondola car in the empty and loaded states was evaluated.
A feature of the reported research results is that the improvement of the strength of the side walls of the gondola car body is achieved by increasing the rigidity of its frame.
The field of practical use of the results is the engineering industry, in particular, railroad transport. The conditions for the practical application of results are the symmetrical distribution of reinforcing belts along the length of the gondola car body.
This study results may contribute to improving the durability of gondola car bodies in operation, and accordingly to reducing costs for unscheduled repairs. Also, the findings could prove useful for designing modern structures of railroad cars
Determining the effect of additional tank volume and air pressure in the spring on the dynamic indicators of a pneumatic system of spring suspension in high-speed railroad rolling stock
Authors: Kuzyshyn Andrii , Kovalchuk Vitalii , Sobolevska Yuliya , Royko Yuriy , Kravets Ivan 
Published: July 2024

The object of this study is the pneumatic system in the spring suspension of rolling stock under conditions of high-speed movement from 170 to 250 km/h.
Based on the thermodynamic model of the pneumatic spring suspension system, the influence of volume of the additional tank and the initial pressure in the pneumatic spring on the nature of change in the spring's dynamic stiffness, energy losses, and damping coefficient was studied.
Based on the built "force-deformation" dependences for the pneumatic spring, it was established that the change in the volume of an additional tank has a slight effect on the deformation of the pneumatic spring at different speeds of the high-speed rolling stock.
It was established that in the range of rolling stock speeds of 170–250 km/h, the diameter of the connecting pipeline is 30 mm, and the volume of the additional tank is from 30 to 60 l, the maximum change in the dynamic stiffness of the pneumatic spring up to 15.5 % occurs at the pressure in the spring of 6.5 bar.
Dependences of energy loss and damping coefficient during the operating cycle of the pneumatic spring suspension system were derived. It was established that an increase in the volume of the additional tank and the initial pressure in the pneumatic spring leads to an increase in the energy loss during the operation cycle of the pneumatic system. The maximum values of the damping coefficient over the entire considered range of variable parameters are 1.16–1.29.
It was established that with the volume of the additional tank in the range from 30 to 50 liters, the maximum values of the damping coefficient are observed at a diameter of the connecting pipeline of 25 mm and a speed of movement from 200 to 250 km/h. And with an additional tank volume of 60 liters – with a diameter of 30 mm and a speed of 170 to 250 km/h
Justification of parameters of impact-spreading finger shaft for grinder-mixer-dryer using the example of eggshells
Authors: Abilzhanuly Tokhtar , Iskakov Ruslan , Abilzhanov Daniyar , Gulyarenko Alexandr , Khan Valery 
Published: July 2024

The object of the study is to determine the critical impact speed during shell destruction, study crack formation in the shell, and grind the shell. When operating a grinder-mixer-dryer, problems arise such as determining the speed of impact on the shell depending on the height of its fall, the lack of ability to determine the speed of shell fall from certain heights, which complicates planning the operation of the finger shaft. As a result of research, it was found that an auger with knives crushes and moves feed raw materials, and the impact-spreading shaft ensures partial grinding of fragile raw materials and intensive processes of mixing and drying wet feed with uniform filling of the installation hopper. The appearance of cracks on the shell when it falls from a height of 0.15 m has been experimentally recorded. Therefore, this speed of impact of the shell on a metal surface is the critical peripheral speed of the impact-spreading shaft, which ensures partial crushing of the shell. As a result of theoretical studies, an analytical expression was obtained that provides the determination of the shell impact speed depending on the height of its fall. The value of the critical peripheral speed of the fingers of the impact-spreading shaft is determined to be 1.66 m/s. The experimental results showed the effective occurrence of grinding, mixing and drying processes. Moreover, within 15 minutes of operation of the installation, the wet shell was crushed in accordance with the requirements. The uniformity reached up to 90 % within 4 to 6 minutes of its operation, and drying proceeded at a rate of 26.54 % per hour. All this proves the effectiveness of the processes of grinding, mixing and drying wet food, and also confirms the reliability of theoretical research
Revealing patterns of change in the tribological efficiency of composite materials for machine parts based on phenylone and polyamide reinforced with arimide-t and fullerene
Authors: Aulin Viktor , Rogovskii Ivan , Lyashuk Oleh , Tykhyi Andrii , Kuzyk Alexander , Dvornyk Andrii , Derkach Oleksiy , Lysenko Serhii , Banniy Oleksandr , Hrynkiv Andrii 
Published: July 2024

The object of the study is the process of changing tribological efficiency according to tribotechnical characteristics (wear intensity, friction coefficient, temperature in the contact zone) of composites based on phenylone C-1 and polyamide PA-6 with arimide-T filler and fullerene C-60. The study solved the problem of obtaining composites with high wear resistance.
Based on the results of research, it was found that varying the content of arimide-T makes it possible to obtain composites with different patterns of changes in tribotechnical characteristics under conditions of dry friction, lubrication with water and I-50 oil. Composites with the composition: phenylone C-1+15 wt. have the maximum tribological efficiency. % arimide-T+3 wt. % fullerene C-60 and polyamide PA-6+30 wt. % arimide-T+3 wt. % fullerene C-60.
Phenylone C-1 has destructive properties when working in the environment of water and temperature in the friction zone. Its reinforcement with arimide-T and fullerene C60 gave positive results of a complex of tribotechnical characteristics under these conditions. It was found that the wear of composites based on phenylone C-1 in I-50 oil is two orders of magnitude lower than in water. Research of samples from the obtained composites based on phenylone C-1 and polyamide PA-6, reinforced with the optimal content of arimide-T and fullerene C60, showed that their wear resistance when lubricated with oil is 3.5...4.0 times greater than the wear resistance of bronze.
An applied aspect of the reported results is the introduction of manufacturing technologies and restoration of machine parts from the proposed composites. It has been proven that their optimal composition contributes to high tribological efficiency and could provide the required level of wear resistance and reliability of resource-determining nodes, systems, and machine assemblies.
The results could be used by machine-building and repair-technological enterprises
Intensification of high-gravity brewer’s wort fermentation process with the use of microelements
Authors: Kosiv Ruslana 
Published: July 2024

In high-gravity brewing, conditions arise that adversely affect the yeast. These are high osmotic pressure, high fermentation temperature, high ethanol content. As a result of these unfavorable factors, the intensity of yeast reproduction and the rate of fermentation decrease, the duration of the process increases, the degree of fermentation decreases, which leads to a change in the taste and aroma profile of the drink. Cofactors of important enzymes and stress modulators are microelement ions, the optimal content of which can be provided by adding appropriate salts to the wort.
In this work, the influence of calcium and zinc on the fermentation of high-gravity beer wort with the participation of Saccharomyces cerevisiae yeast strain Saflager W-34/70 was investigated.
The optimal dosage of CaCl2 and ZnSO4 salts was determined, which is 5.0 and 0.1 mg/dm3, respectively. It was established that adding CaCl2 to the wort leads to an increase in the rate of fermentation by 21.9 %, the apparent and actual degree of fermentation by 17.8 and 17.0 %, respectively. At the same time, the ethanol content in young beer increases by 19.1 %, the content of visible and actual extract decreases by 28.8 and 17.5 %, respectively, and the biomass of yeast accumulated during fermentation increases by 14.0 %. When using ZnSO4, the changes in the values of all these indicators are significantly smaller and lie in the range of 3.2‒5.8 %. Other physical-chemical parameters of the studied samples of young beer, namely acidity, pH value, content of vicinal diketones, do not undergo significant changes.
To enhance the growth and metabolism of yeast under adverse conditions that occur during high-gravity brewing, it is recommended to add CaCl2 to beer wort in the amount of 5.0 mg/dm3. This will make it possible to reduce the duration of fermentation of wort with a dry matter content of 18 % at a temperature of 15 ℃ by 1.5 days (21 %)
Ensuring fire safety: compliance tests for the use of polystyrene foam in facades systems
Authors: Šukys Ritoldas , Stankiuvienė Aušra , Stas Serhiy , Skrodenis Saulius Vytautas , Tyshchenko Oleksandr 
Published: July 2024

Ensuring fire safety is the most important thing in the construction industry, especially when it comes to facade materials. The inherent flammability of polystyrene foam poses significant safety concerns, especially when integrated into facade systems. Therefore, the main focus is on meeting the strict flammability requirements set for construction products, which are assessed by applying rigorous test procedures.
This study focuses on the fire resistance testing of a facade system using EPS 70 with graphite additives. The system has been evaluated according to the strict DIN 4102-20 standards. Tests were conducted under real-world conditions to gain insight into the performance of the EPS 70 in real-world fire scenarios. Temperature measurements were taken at various points in the facade system, including at least 3.5 meters above the combustion chamber. The results showed that the temperature does not exceed 500 °C, so it is possible to quantify the thermal properties of the material and the ability to prevent the vertical spread of fire. After the tests, detailed post-test inspections were carried out to evaluate the internal flame propagation after removing the top layer of plaster. The study confirms that polystyrene foam EPS 70 with graphite additives meets the fire safety requirements of DIN 4102-20, which suggests that it can be used more widely in building facades to improve fire safety in residential and commercial buildings. The study highlights the importance of adhering to installation standards, emphasizing the need for accurate installation practices. It also encourages the development of new composite materials with similar or improved fire safety properties, laying the foundation for further innovations in fire-resistant materials
Enrichment of functional drinks using grape pomace extracts, analysis of physicochemical indicators
Authors: Fataliyev Hasil , Gadimova Natavan , Huseynova Shafiga , Isgandarova Simuzar , Heydarov Elnur , Mammadova Sevda 
Published: July 2024

A large amount of residues called secondary raw materials are formed during grape processing, the majority of which are pomace-containing seeds. Pomace is obtained by crushing grapes with subsequent juice separation and appears as a mass consisting of skin, seeds, as well as stalk and comb residues. When compared to the control, the amount of skin in the fermented pomace increased 15 %, while the amount of seeds decreased by about 50 %.
The objects of research is juice, wine materials, functional drinks, technological methods and means.
The problem is that the samples of juice and dark wine prepared by the "White method" are not provided with a sufficient amount of extract substances, especially compounds that provide functionality. The results of the experiment show that adding 25–30 % wine-alcohol extract of marc to the wine material obtained by the “white method” from the Bayanshira grape variety, and adding 25–30 % alcohol-juice extract to the juice obtained from its own stream, give a positive result. Compared to the control, in the prepared functional wine samples the content of phenolic compounds increased by 100 mg/dm3, and there was also an increase in the amount of vitamins B2, C, PP, B6 and resveratrol.
Rational technological parameters for the extraction of biologically active substances from grapes and their structural components have been established. It has been established that mixing fermented pomace with a 30 % wine-alcohol (juice-alcohol or aqueous-alcohol solution) extractant in a 1:3 hydromodule gives the best result.
It is of practical importance to enrich low-extracted juices and wines with extracts obtained from the solid parts of the cluster to produce functional drinks
Determining the influence of relative humidity on the working parameters of a gas sensor based on zinc oxide
Authors: Minska Natalia , Levterov Alexander , Shevchenko Olga , Sihaiov Andrii , Shcherbak Oleksii , Poliakov Serhii , Rotar Vasyl , Rebrov Oleksandr , Kradozhon Volodymyr , Zobenko Nataliia 
Published: July 2024

This paper investigates the dependence of operating parameters of a gas sensor based on zinc oxide obtained by the method of direct current magnetron sputtering. The production of gas sensor films was carried out using a VUP-5M vacuum unit with an original material-saving magnetron. The study of the dependence of the working parameters of the gas sensor was carried out under standard conditions. It was found that with increasing humidity, the electrical resistance of the gas sensor decreases and, accordingly, the sensitivity to the target gas decreases. A significant reaction of the gas sensor to an increase in humidity was observed in the range of 65–80 % relative humidity. The mechanism of influence of relative humidity on the sensitivity of a gas sensor based on ZnO was investigated. The change in resistance of the gas sensor is caused by trapped electrons on adsorbed oxygen molecules on the surface of the sensitive layer. The capture of electrons from the conduction zone leads to bending of the conduction zone and an increase in the space charge zone, respectively, to a change in the resistance of the sensitive layer of the gas sensor. In the atmosphere, when O2 molecules are adsorbed on the ZnO surface, they remove an electron from the conduction band. The reaction of oxygen adsorbed on the ZnO surface with reducing gases and the replacement of adsorbed oxygen with other molecules changes the bending of the conduction band and reduces the area of space charge. Adsorption of water on the surface of zinc oxide occurs according to the dissociation mechanism, which consists in the adsorption of steam molecules or hydroxyl groups with the subsequent displacement of previously adsorbed oxygen and free electrons and, accordingly, leads to a decrease in the sensitivity of the gas sensor. In addition, the adsorption of water vapor (H2O) molecules leads to less chemisorption of oxygen species on the ZnO surface due to the reduction of the surface area, which is responsible for the sensor response. Approaches to reduce the influence of relative humidity on the sensitivity of a gas sensor based on zinc oxide have been proposed
In memoriam Kerekes József (1932-2022)
Authors: Faragó Sándor 
Published: July 2024

In memoriam Joseph J. Kerekes (1932-2022). On September 17, 2022. in Halifax, at the age of 90, died JOSEPF J. KEREKES (Figure 1), a member of the editorial board of Hungarian Waterfowl Publications, a great friend of Hungarian limnologists and ornithologists, and an internationally known and recognized retired senior research scientist of the Canadian Wildlife Service/Environmental Canada. With his death, a fruitful relationship of more than two decades between him and the Institute of Wildlife Management and Wildlife Biology of the University of Sopron was broken.
Polymyxin B neurotoxicity as manifestation of a serious life-threatening adverse reaction: clinical case
Authors: Sytov A. V. , Epifanova N. Yu. , Yukhina A. I. , Grishenkin I. Yu. 
Published: July 2024

The aim of this work is to describe a clinical case of a serious life-threatening adverse reaction in the form of neurotoxicity (convulsions, apnea requiring mechanical ventilation) to the polymyxin B drug, and also to remind that manifestations of neurotoxicity can be extremely varied and nonspecific, and do not occur after every administration, can be delayed, require vigilance and careful monitoring both from the attending physicians and from anesthesiologistsresuscitators, neurologists, ophthalmologists, etc.A 62-year-old female patient diagnosed with stage IIIB T4G3N0M0 pleomorphic soft tissue sarcoma of the right thigh, condition after combination treatment, developed infection and necrosis of the postoperative wound (recto-abdominal flap). According to the results of a microbiological study and an antibiogram, the patient received polymyxin B as part of combination antibacterial therapy. On days 4, 5, 6, 7 of polymyxin administration, the patient experienced the following symptoms in various combinations: weakness, numbness of the face, paresthesia, paresis of the limbs, partial convulsions, respiratory depression, and apnea.After establishing a connection between neurologicalsymptoms and intravenous administration of polymyxin B (the total score on the Naranjo scale was 6 points, the degree of reliability of the “adverse reaction–drug” relationship was probable) and drug withdrawal, manifestations of neurotoxicity completely disappeared and did not reoccur. The patient was discharged in satisfactory condition.In a patient with symptoms of damage to the nervous system, it is necessary to conduct multiple differential diagnostic search to exclude stroke, epilepsy, encephalitis, hereditary and acquired neurodegenerative diseases, as well as side effects of medications. At the slightest suspicion of the likelihood of an adverse reaction to polymyxin B/colistimethate sodium, the Naranjo algorithm must be used to establish a cause-and-effect relationship between the adverse reaction and the drug.
Primary hyperparathyroidism in pregnancy after in vitro fertilization
Authors: Bondarenko A. S. , Bibik E. E. , Voskoboynikov V. V. , Kolegaeva O. I. , Sazonova A. I. , Eremkina A. K. , Lunyakina O. V. , Ionanidze T. Yu. , Aksenenko A. A. , Esayan R. M. , Tetruashvili N. K. , Platonova N. M. , Mokrysheva N. G. 
Published: July 2024

Primary hyperparathyroidism (PHPT) in pregnant women is a rare condition, often remaining undiagnosed due to non-specific clinical symptoms. However, it can lead to life-threatening complications for both the mother and fetus. In vitro fertilization (IVF) is also associated with an increased probability of adverse outcomes compared to the general population. Timely diagnostics and personalized treatment, taking into account the extremely high risk of complications if PHPT and pregnancy result from IVF, require attention of healthcare professionals and formation of a multidisciplinary team.
Visão de usuários da Atenção Primária à Saúde acerca de emergências cardiovasculares
Authors: Nascimento Caio Bruno Andrade , Silva Aline Teixeira , Pereira Vanessa Oliveira Silva , Carvalho Marco Túlio Menezes , Bernardes Elexandra Helena , Alves Mateus Goulart 
Published: July 2024

Objetivo: constatar o quanto os fatores emocionais e empíricos influenciam na conduta de pessoas não treinadas em um evento cardiovascular súbito. Método: estudo transversal, realizado por meio de um questionário sobre fatores socioeconômicos, experiências prévias em situações emergenciais e condutas a serem tomadas diante de casos hipotéticos. Após, identificou-se as variáveis que se encontraram mais associadas à tomada de atitudes corretas. Realizou-se uma análise descritiva. Resultados: participaram 51 pessoas, das quais 14 (27,45%) afirmaram já ter participado de alguma formação em suporte básico de vida ou primeiros socorros e 37 (72,54%) afirmaram não participação. Daquelas que participaram, nove (64,28%) responderam corretamente o número do SAMU 192, e a porcentagem de pessoas que disseram saber realizar uma Ressuscitação Cardiopulmonar foi de 14,81% (nas pessoas que nunca presenciaram emergências) e 37,5% (grupo que já presenciou). Conclusão: percebeu-se que, quanto mais uma pessoa é exposta a emergências ou recebe formações sobre suporte básico, maiores são as chances de reagir correta e calmamente em uma emergência.