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Загальна кількість знайдених документів : 13 Представлено документи з 1 до 13 |
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| 1. | 
Kravtsov M. K. Ways to increase the durability of materials in modern mechanical engineering [Електронний ресурс] / M. K. Kravtsov, T. A. Obolenskaya, I. V. Beletskaya // Машинобудування. - 2012. - № 10. - С. 173-179. - Режим доступу: http://nbuv.gov.ua/UJRN/Mashbud_2012_10_19 Розглянуто область застосування, класифікацію, фізико-механічні властивості композитів, проблему використання композиційних матеріалів у сучасному машинобудуванні. | ||
| 2. |
Kravtsov M. K. Recent development of the strength of theory in the field of material mechanics [Електронний ресурс] / M. K. Kravtsov, T. A. Obolenskaya, N. V. Sereda, I. V. Beletskaya // Машинобудування. - 2013. - № 11. - С. 82-84. - Режим доступу: http://nbuv.gov.ua/UJRN/Mashbud_2013_11_16 Розглянуто проблеми в галузі проектування та розрахунку на міцність і жорсткість елементів, на яких діють сили і теплові навантаження. | ||
| 3. | 
Sytnik N. Rational parameters of waxes obtaining from oil winterization waste [Електронний ресурс] / N. Sytnik, E. Kunitsia, V. Mazaeva, A. Chernukha, P. Kovalov, N. Grigorenko, S. Gornostal, O. Yermakova, M. Pavlunko, M. Kravtsov // Восточно-Европейский журнал передовых технологий. - 2020. - № 6(10). - С. 29-35. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2020_6(10)__5 Production of waxes from spent perlite, which is a waste of sunflower oil winterization, is studied. Winterization is characterized by significant losses of oil with filter powders, and waste utilization is an environmental and economic problem. At the same time, winterization waste contains valuable components - wax and oil, which can be used in different ways. The content of waxes in spent perlite using hexane (18 %), as well as the quality indicators of the obtained wax: melting point 70 <^>o | ||
| 4. | 
Raskin L. A method for solving the canonical problem of transport logistics in conditions of uncertainty [Електронний ресурс] / L. Raskin, Yu. Parfeniuk, L. Sukhomlyn, M. Kravtsov, L. Surkov // Сучасний стан наукових досліджень та технологій в промисловості. - 2021. - № 2. - С. 80-88. - Режим доступу: http://nbuv.gov.ua/UJRN/dtssi_2021_2_12 | ||
| 5. |
Kudin D. Designing capacitive deionization module for water treatment systems at car washers [Електронний ресурс] / D. Kudin, G. Taran, O. Bazhynov, M. Kravtsov // Eastern-european journal of enterprise technologies. - 2021. - № 5(6). - С. 46-53. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2021_5(6)__8 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 m<^>2 | ||
| 6. |
Slyusar V. Improving a neural network model for semantic segmentation of images of monitored objects in aerial photographs [Електронний ресурс] / V. Slyusar, M. Protsenko, A. Chernukha, V. Melkin, O. Petrova, M. Kravtsov, S. Velma, N. Kosenko, O. Sydorenko, M. Sobol // Eastern-european journal of enterprise technologies. - 2021. - № 6(2). - С. 86-95. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2021_6(2)__9 This paper considers a model of the neural network for semantically segmenting the images of monitored objects on aerial photographs. Unmanned aerial vehicles monitor objects by analyzing (processing) aerial photographs and video streams. The results of aerial photography are processed by the operator in a manual mode; however, there are objective difficulties associated with the operator's handling a large number of aerial photographs, which is why it is advisable to automate this process. Analysis of the models showed that to perform the task of semantic segmentation of images of monitored objects on aerial photographs, the U-Net model (Germany), which is a convolutional neural network, is most suitable as a basic model. This model has been improved by using a wavelet layer and the optimal values of the model training parameters: speed (step) - 0,001, the number of epochs - 60, the optimization algorithm - Adam. The training was conducted by a set of segmented images acquired from aerial photographs (with a resolution of 6,000 x 4,000 pixels) by the Image Labeler software in the mathematical programming environment MATLAB R2020b (USA). As a result, a new model for semantically segmenting the images of monitored objects on aerial photographs with the proposed name U-NetWavelet was built. The effectiveness of the improved model was investigated using an example of processing 80 aerial photographs. The accuracy, sensitivity, and segmentation error were selected as the main indicators of the model's efficiency. The use of a modified wavelet layer has made it possible to adapt the size of an aerial photograph to the parameters of the input layer of the neural network, to improve the efficiency of image segmentation in aerial photographs; the application of a convolutional neural network has allowed this process to be automatic. | ||
| 7. |
Melnichenko A. Devising a procedure to forecast the level of chemical damage to the atmosphere during active deposition of dangerous gases [Електронний ресурс] / A. Melnichenko, M. Kustov, O. Basmanov, O. Tarasenko, O. Bogatov, M. Kravtsov, O. Petrova, T. Pidpala, O. Karatieieva, N. Shevchuk // Eastern-European journal of enterprise technologies. - 2022. - № 1(10). - С. 31-40. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2022_1(10)__6 This paper reports a procedure devised to forecast the level of chemical pollution of the atmosphere, which includes a mathematical model for the distribution of the concentration of dangerous gas in the atmosphere at its active deposition by dispersed jets of liquid, as well as a technique for its implementation. Based on the differential equations of gas distribution in space, a phased model of the propagation of a cloud of a dangerous chemical substance was built. The model describes stages in the discharge of a dangerous gaseous substance from emergency technological equipment, the deposition of dangerous gas by a finely-dispersed flow, and free propagation of the cloud in the air. The reported mathematical model makes it possible to calculate the size of pollution zones while determining the boundary safety conditions. When forecasting, the main meteorological parameters, the width of the deposition zone, and the chemical properties of both the gas and liquid are taken into consideration. The comparative analysis of the results of forecasting a conditional zone of chemical damage with the free propagation of the cloud, and at the active deposition by precipitation or technical devices, was carried out. The simulation results revealed that with an increase in the wind speed from 1 m/s to 5 m/s, the size of the affected area increases by 2,7 times, while the concentration of dangerous gas in the cloud falls by 2,5 - 3 times. An algorithm has been proposed for integrating the devised methodology of forecasting the level of chemical pollution of the atmosphere into a general cycle of emergency management. It should be especially noted that the devised procedure contains the entire range of components that are necessary for its practical application. It includes a description of the procedure and practical recommendations for the use of the proposed technique in the elimination of emergencies, as well as a list of probable events when the use of the developed procedure would be most effective. | ||
| 8. |
Saveliev D. Development of technology for obtaining fat compositions with increased oxidative stability [Електронний ресурс] / D. Saveliev, O. Hryhorenko, E. Mykhailova, M. Kravtsov, O. Kostyrkin, A. Nikitin, V. Romaniuk, O. Smolkov, I. Meshcheriakov, V. Bahlai // Eastern-European journal of enterprise technologies. - 2023. - № 1(6). - С. 33–39. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2023_1(6)__6 The object of research is the process of fat oxidation at elevated and standard temperatures. Fats are used in chemical, pharmaceutical, food and other industries. Oxidative deterioration changes the composition of fats, reduces the efficiency of chemical reactions involving fats and the quality of final products. An urgent task is to increase the oxidative stability of fats. The oxidative stability of fat compositions based on rapeseed, high-oleic sunflower and palm oils by the induction period at a temperature of 110 <^>o | ||
| 9. |
Pospelov B. Comparison of bicoherence on the ensemble of realizations and a selective evaluation of the bispectrum of the dynamics of dangerous parameters of the gas medium during fire [Електронний ресурс] / B. Pospelov, E. Rybka, D. Polkovnychenko, I. Myskovets, Y. Bezuhla, T. Butenko, S. Harbuz, L. Prokhorova, O. Levada, M. Kravtsov // Eastern-European journal of enterprise technologies. - 2023. - № 2(10). - С. 14–21. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2023_2(10)__4 The object of the study is the bicoherence of the bispectrum assessment of the dynamics of dangerous parameters of the gas environment during the ignition of materials. The subject is a measure of bicoherence of the bispectrum estimation from the ensemble of realizations and selective bispectrum estimation for the dynamics of hazardous parameters of the gas environment. The practical importance of the research is the use of the measure of bicoherence of the bispectrum for the early detection of fires. The measure of bicoherence of the dynamics of hazardous parameters of the gas environment is substantiated, which allows them to be numerically compared for the studied bispectrum estimates. As such measure, it is proposed to use the integral value of bicoherence for a given frequency interval, which makes it possible to numerically compare the bicoherence of bispectrum estimates for arbitrary time intervals of the dynamics of hazardous parameters of the gas environment. On the basis of the proposed measure for the frequency range of 0,2 - 2 Hz, a comparison of the integral bicoherence of the bispectrum estimates was made. The numerical value of the measure was determined for three fixed time intervals of the dynamics of hazardous parameters of the environment, corresponding to the absence of ignition, the occurrence of ignition, and the subsequent burning of test materials in the laboratory chamber. According to the results of the comparison of such values, it was established that the bicoherence of the bispectrum estimation from the ensemble of realizations is the most appropriate for detecting fires. When ignited, the numerical value of the measure for all test materials is about 90<^>o | ||
| 10. |
Pospelov B. Dynamics of skewness and kurtosis of dangerous environmental parameters in the event of fire [Електронний ресурс] / B. Pospelov, V. Andronov, Y. Bezuhla, R. Lukysha, T. Lutsenko, Y. Kozar, M. Kravtsov, L. Gula, O. Nepsha, T. Zavialova // Eastern-European journal of enterprise technologies. - 2023. - № 5(10). - С. 53–62. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2023_5(10)__8 | ||
| 11. |
Saveliev D. Development of conditions for obtaining oil from sunflower oil hydration waste [Електронний ресурс] / D. Saveliev, V. Rotar, M. Kravtsov, O. Petrova, A. Ziuzko, N. Shevchuk, S. Velma, A. Rozumenko, V. Demenko, T. Samchenko // Eastern-European journal of enterprise technologies. - 2024. - № 2(6). - С. 14–19. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2024_2(6)__4 | ||
| 12. |
Tolok I. Detection of fire by comparison of sampling coefficients of variation of current measurements of dangerous parameters of the gas environment [Електронний ресурс] / I. Tolok, B. Pospelov, E. Rybka, A. Iatsyshyn, Y. Kozar, O. Krainiukov, I. Morozov, Y. Bezuhla, M. Kravtsov, O. Salamatina // Eastern-European journal of enterprise technologies. - 2024. - № 6(5). - С. 6–12. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2024_6(5)__3 | ||
| 13. | 
Kravtsov M. O. Main aspects of functioning of phone "hot lines" of state authorities [Електронний ресурс] / M. O. Kravtsov // Public manаgement. - 2020. - № 3. - С. 138-148. - Режим доступу: http://nbuv.gov.ua/UJRN/pubm_2020_3_12 | ||
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