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Загальна кількість знайдених документів : 10 Представлено документи з 1 до 10 |
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| 1. | 
Sachenko A. V. Peculiarities of the temperature dependences of silicon solar cells illuminated with light simulator [Електронний ресурс] / A. V. Sachenko, V. P. Kostylyov, R. M. Korkishko, M. R. Kulish, I. O. Sokolovskyi, V. M. Vlasiuk, D. V. Khomenko // Semiconductor physics quantum electronics & optoelectronics. - 2015. - Vol. 18, № 3. - С. 259-266. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2015_18_3_6 Characteristics of basic silicon solar cells are experimentally researched and theoretically modeled using photons of incandescent lamps as sunlight simulator. It was established that increasing temperature evokes significant acceleration of short-circuit current growth. The reason of it is the shift of simulator spectrum to the higher wavelengths region as compared to the Sun one. This effect leads to a reduction in efficiency decrease for simulated sunlight with the increase of temperature. It should be taken into account in efficiency loss calculation with increase in the operating temperature. It has been shown that the results of theoretical modeling the temperature dependences for the short-circuit current density, open-circuit voltage and photoconversion efficiency are in good agreement with the experimental data obtained using the sunlight simulator. These results could be used to develop methods for investigation of temperature dependences of solar cell characteristics by using various sunlight simulators. | ||
| 2. |
Sachenko A. V. The influence of the exciton non-radiative recombination in silicon on the photoconversion efficiency. 1. The case of a long Shockley–Read–Hall lifetime [Електронний ресурс] / A. V. Sachenko, V. P. Kostylyov, V. M. Vlasiuk, I. O. Sokolovskyi, M. Evstigneev // Semiconductor physics, quantum electronics & optoelectronics. - 2016. - Vol. 19, № 4. - С. 334-342. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2016_19_4_5 By comparison of the experimental dependence of bulk lifetime in silicon on the doping and excitation levels with theoretical calculations, it has been shown that a new recombination channel becomes operative when Shockley - Read - Hall lifetime is below 20 ms and the density of doping impurities or the excess electron-hole pair density is of the order of 1016 cm-3. This recombination mechanism is related to the non-radiative exciton Auger recombination assisted by the deep impurities in the bulk. The influence of non-radiative exciton recombination on the photoconversion efficiency in solar cells has been analyzed. It has been shown that the shorter the Shockley - Read - Hall lifetime, TSHR, the stronger its effect. In particular, for TSHR = 100 mu s, this recombination channel leads to the reduction of the photoconversion efficiency by 5,5 %. | ||
| 3. |
Sachenko A. V. Influence of non-radiative exciton recombination in silicon on photoconversion efficiency. 2. Short Shockley-Read-Hall lifetimes [Електронний ресурс] / A. V. Sachenko, V. P. Kostylyov, V. M. Vlasiuk, R. M. Korkishko, I. O. Sokolovskyi, V. V. Chernenko, M. A. Evstigneev // Semiconductor physics, quantum electronics & optoelectronics. - 2017. - Vol. 20, № 1. - С. 34-40. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2017_20_1_6 The influence of non-radiative exciton recombination (NRER) on the photoconversion efficiency in silicon solar cells with short Shockley - Read - Hall lifetimes <$Etau sub SRH> has been studied. It has been shown that the efficiency reduction due to this effect is the stronger the shorter <$Etau sub SRH>. The influence of NRER is most evident when the NRER time becomes shorter than <$Etau sub SRH>. At sufficiently short <$Etau sub SRH>, NRER substantially limits the optimal base doping levels of silicon solar cells, at which the photoconversion efficiency is maximal. | ||
| 4. | 
Sachenko A. V. Features in the formation of a recombination current in the space charge region of silicon solar cells [Електронний ресурс] / A. V. Sachenko, V. P. Kostylyov, V. M. Vlasiuk, R. M. Korkishko, I. O. Sokolovs'kyi, V. V. Chernenko // Ukrainian journal of physics. - 2016. - Vol. 61, № 10. - С. 917-922. - Режим доступу: http://nbuv.gov.ua/UJRN/Ukjourph_2016_61_10_11 | ||
| 5. | 
Hryhoriev S. Studying the physical-chemical properties of alloyed metallurgical waste as secondary resource-saving raw materials [Електронний ресурс] / S. Hryhoriev, A. Petryshchev, N. Sinyaeva, A. Yurchenko, O. Sklyar, S. Kvitka, V. Borysov, V. Vlasiuk, B. Tsymbal, S. Borysova // Восточно-Европейский журнал передовых технологий. - 2018. - № 4(12). - С. 43-48. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2018_4(12)__7 Досліджено особливості фазового складу та мікроструктури шлаків алюмотермічного виробництва лігатур тугоплавких елементів різних марок та окалини швидкоріжучої сталі Р6М5 щодо природи присутності легувальних елементів. Це є необхідним для забезпечення зменшення втрат Mo, W та інших легувальних елементів сублімацією з підвищенням температури у процесі переробки техногенних відходів. Фазовий склад визначено методом рентгенофазового аналізу. Мікроструктуру досліджено на растровому електронному мікроскопі в комплексі з рентгенівським мікроаналізом із використанням безеталоного методу розрахунку фундаментальних параметрів. Визначено, що шлаки алюмотермічного виробництва лігатур АХМ-50 та АМВТ складаються з CaAl | ||
| 6. | 
Vlasiuk V. Hybrid war, international law and eastern Ukraine [Електронний ресурс] / V. Vlasiuk // Evropský politický a právní diskurz. - 2015. - Sv. 2, Vyd. 4. - С. 14-28. - Режим доступу: http://nbuv.gov.ua/UJRN/evrpol_2015_2_4_4 | ||
| 7. |
Kostylyov V. P. Synthesis and investigation of the properties of organic-inorganic perovskite films with non-contact methods [Електронний ресурс] / V. P. Kostylyov, A. V. Sachenko, V. M. Vlasiuk, I. O. Sokolovskyi, S. D. Kobylianska, P. V. Torchyniuk, O. I. V’yunov, A. G. Belous // Ukrainian journal of physics. - 2021. - Vol. 66, № 5. - С. 429-438. - Режим доступу: http://nbuv.gov.ua/UJRN/Ukjourph_2021_66_5_11 | ||
| 8. | 
Kostylyov V. P. Synthesis and investigation of the properties of organic-inorganic perovskite films with non-contact methods [Електронний ресурс] / V. P. Kostylyov, A. V. Sachenko, V. M. Vlasiuk, I. O. Sokolovskyi, S. D. Kobylianska, P. V. Torchyniuk, O. I. V’yunov, A. G. Belous // Український фізичний журнал. - 2021. - Т. 66, № 5. - С. 429-438. - Режим доступу: http://nbuv.gov.ua/UJRN/UPhJ_2021_66_5_11 | ||
| 9. | 
Asmontas S. Suppression of hot carriers by nanoporous silicon for improved operation of a solar cell [Електронний ресурс] / S. Asmontas, L. Fedorenko, V. Vlasiuk, T. Gorbanyuk, V. Kostylyov, V. Lytovchenko, J. Gradauskas, A. Suziedelis, E. Sirmulis, O. Zalys // Ukrainian journal of physical optics. - 2020. - Vol. 21, № 4. - С. 207-214. - Режим доступу: http://nbuv.gov.ua/UJRN/UJPO_2020_21_4_8 | ||
| 10. |
Khudov H. Devising a method for processing the image of a vehicle's license plate when shooting with a smartphone camera [Електронний ресурс] / H. Khudov, O. Makoveichuk, D. Misiuk, H. Pievtsov, I. Khizhnyak, Y. Solomonenko, I. Yuzova, V. Cherneha, V. Vlasiuk, V. Khudov // Eastern-European journal of enterprise technologies. - 2022. - № 1(2). - С. 6-21. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2022_1(2)__3 This paper reports an improved method for processing the image of a vehicle's license plate when shooting with a smartphone camera. The method for processing the image of a vehicle's license plate includes the following stages: enter the source data; split the video streaming into frames; preliminary process the image of a vehicle's license plate; find the area of a vehicle's license plate; refine character recognition using the signature of a vehicle's license plate; refine character recognition using the combined results from frames in the streaming video; obtain the result of processing. Experimental studies were conducted on the processing of images of a vehicle's license plate. During the experimental studies, the license plate of a military vehicle (Ukraine) was considered. The original image was the color image of a vehicle. The results of experimental studies are given. A comparison of the quality of character recognition in a license plate has been carried out. It was established that the improved method that uses the combined results from streaming video frames works out efficiently at the end of the sequence. The improved method that employs the combined results from streaming video frames operates with numerical probability vectors. The assessment of errors of the first and second kind in processing the image of a license plate was carried out. The total accuracy of finding the area of a license plate by known method is 61 % while the improved method's result is 76 %. It has been established that the minimization of errors of the first kind is more important than reducing errors of the second kind. If a license plate is incorrectly identified, these results would certainly be discarded at the character recognition stage.This paper considers the improved method for segmenting complex structured images acquired from space observation systems based on the particle swarm algorithm. Unlike known ones, the method for segmenting complex structured images based on the particle swarm algorithm involves the following: highlighting brightness channels in the Red-Green-Blue color space; - using a particle swarm method in the image in each channel of brightness of the RGB color space; image segmentation is reduced to calculating the objective function, moving speed, and a new location for each swarm particle in the image in each RGB color space brightness channel. Experimental studies have been conducted on the segmentation of a complex structured image by a method based on the particle swarm algorithm. It was established that the improved segmentation method based on the particle swarm algorithm makes it possible to segment complex structured images acquired from space surveillance systems. A comparison of the quality of segmenting a complex structured image was carried out. The comparative visual analysis of well-known and improved segmentation methods indicates the following: the improved segmentation method based on the particle swarm algorithm highlights more objects of interest (objects of military equipment); the well-known k-means method assigns some objects of interest (especially those partially covered with snow) to the snow cover (marked in blue); - the improved segmentation method also associates some objects of interest that are almost completely covered with snow with the snow cover (marked in blue). It has been established that the improved segmentation method based on the particle swarm algorithm reduces segmentation errors of the first kind by an average of 12 % and reduces segmentation errors of the second kind by an average of 8 %. | ||
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