Інституційний репозитарій Миколаївського національного аграрного університету
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Система цифрового хранилища Dspace получает, хранит, индексирует и распространяет цифровые исследовательские материалы.
2024-03-10T10:34:27Z
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Influence of Foliar Top Dressing with Microfertilizers on Sunflower Growth, Development and Productivity
https://dspace.mnau.edu.ua/jspui/handle/123456789/17109
Название: Influence of Foliar Top Dressing with Microfertilizers on Sunflower Growth, Development and Productivity
Авторы: Коваленко, Олег Анатолійович; Kovalenko, Oleg; Домарацький, Євгеній Олександрович; Domaratskiy, Yevhenii; Панфілова, Антоніна Вікторівна; Panfilova, Antonina; Корхова, Маргарита Михайлівна; Korhova, Margarita; Нерода, Руслан Сергійович; Neroda, Ruslan
Краткий осмотр (реферат): he purpose of the research is to determine the duration of the interphase period, total water consumption, plant height, yield and quality of sunflower seeds, depending on the characteristics of hybrids and foliar top dressing with microfertilizers. Methods. Experimental studies were conducted during 2020–2021 in the experimental field of Mykolaiv National Agrarian University (Ukraine). Results. It was determined that all the studied microfertil-izers extended the duration of interfacial periods of sunflower plants. The largest total water consumption of sunflower plants (2259 m3/ha) was formed in the hybrid NK Kamen in the variant with foliar top dressing with microfertilizer Quantum, which was 0.9–6.5% more than in the same variant with hybrids Darius and Tutti. The highest height of sunflower plants among the hybrids submitted for study was formed by Darius – 165.7–170.9 cm, which was 5.0–5.7% higher than the height of plants of the NK Kamen hybrid and 7.2–8.0% more than the height of Tutti hybrid. It was found that the highest yield of sunflower seeds (2.55 t/ha) on average over the years of research was formed in the hybrid NK Kamen in the variant with foliar top dressing with microfertilizer Quan-tum, which exceeded its level in the non-fertilized control by 18.6% and the average yield for all variants of the experiment by 12.3%. The highest yield of sunflower seeds (2.56 t/ha) among the hybrids submitted for study was provided by NK Kamen in 2021, which was 12.3% more than in the Darius hybrid and 6.6% more than in the Tutti hybrid. Foliar top dressing with microfertilizers significantly affected the quality indicators of seeds of the studied sunflower hybrids. The maximum fat content values (from 50.1 up to 52.7%, depending on the hybrid) were achieved by applying Quantum microfertilizer in the 5-6-leaf phase. The conditional yield of oil from seeds in this variant of nutrition is also determined to be the maximum – from 1.13 up to 1.34 t/ha, depending on the hybrid. Less effective for the growth and development of plants and the formation of their productivity was the preparation Rostok, with the introduction of which the duration of the growing season increased by 1-2 days; total water consumption increased by 29–35 m3/ha; the height increased by 1.1–4.6 cm; seed yield increased by 0.80–0.28 t/ ha; the content fat in seeds increased by 0.02–0.03%; oil seed yield increased by 0.12–0.15 t/ha. © 2024, Polskie Towarzystwo Inzynierii Ekologicznej (PTIE).
2024-01-01T00:00:00Z
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Technical solutions to reduce losses in magnetic cores and material consumption of three-phase transformer and reactor equipment
https://dspace.mnau.edu.ua/jspui/handle/123456789/17108
Название: Technical solutions to reduce losses in magnetic cores and material consumption of three-phase transformer and reactor equipment
Авторы: Ставинський, Андрій Андрійович; Stavinskiy, Andrey; Avdeeva, O. A.; Авдєєва, О.А.; Кошкін, Дмитро Леонідович; Koshkin, Dmitriy; Stavynskyi, R. A.; Ставинський, Р. А.; Циганов, Олександр Миколайович; Tsyiganov, Aleksandr
Краткий осмотр (реферат): The increase in energy costs and the need for further energy saving lead to an increase in requirements for reducing losses in the magnetic cores of transformers and reactors. Problem. The improvement of transformer and reactor equipment is traditionally carried out by applying the achievements of electrical materials science and new technologies to traditional designs and structures of electromagnetic systems. The basis of modern transformers is made up of laminated and twisted magnetic cores. The disadvantage of laminated magnetic cores is large additional losses in corner zones due to the texture of anisotropic steel. Disadvantage of twisted three-phase three-contour magnetic cores is large additional losses caused by the lack of magnetic coupling of three separate magnetic flux con-tours. The disadvantages of combined joint tape-plate magnetic cores are the unsatisfactory use of the active volume and in-creased losses, which are determined by the uneven distribution of the magnetic field and the negative impact of steel texture in the corner zones of the twisted parts. Aim. To determine the possibility of improving three-phase transformers and reactors. Methodology. The improvement is achieved by geometrical and structural transformations of the outer contours and elements of the varieties of magnetic cores. Results. The possibility of eliminating additional losses of a planar laminated magnetic core by a combination of anisotropic and isotropic steels at the appropriate location in the yoke-rod and corner sections is deter-mined. With an octagonal outer contour of the combined magnetic core, a reduction in mass is achieved without an increase in losses. The mutually orthogonal position of the steel layers or the elements of the joint twisted and combined three-phase planar and spatial magnetic cores achieves magnetic coupling and elimination of additional losses of individual twisted contour sections. The hexagonal configurations of the inner contours of the twisted yoke-corner parts and the cross-sections of the laminated rods of the variants of the axial spatial joint magnetic core improve the magnetic flux density distribution and reduce the main losses of the yokes, as well as reduce the complexity of manufacturing rods from identical rectangular steel layers. Originality. The paper presents constructive and technological proposals and features of varieties of non-traditional planar and spatial, laminated, twisted and combined tape-plate joint magnetic cores, which differ in the combination of anisotropic, isotropic and amorphous steels, as well as the multifaceted geometric shape of contours and the spatial arrangement of elements. Based on the identity of the optimal geometric ratios of the variants of electromagnetic systems of transformers and reactors, with joint planar and spatial twisted and combined and tape-plate magnetic cores, the unification of the structure of transformer and reactor equipment with a capacity of I-III dimensions.; -; Розглянуто стан розвитку трансформаторобудування. Визначена недостатня ефективність застосування відомих способів зниження втрат у магнітопроводах для задоволення нових вимог енергоресурсозбереження. Показана можливість удосконалення і уніфікації трифазних трансформаторів та реакторів на основі комбінацій анізотропної, ізотропної і аморфної сталей, багатогранних геометричних конфігурацій контурів та зміни положень в просторі шарів сталі, а також елементів планарних і просторових шихтованих, витих та комбінованих навито-пластинчастих магнітопроводів.
2024-01-01T00:00:00Z
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Активні методи і форми навчання та інноваційні підходи у закладах вищої освіти
https://dspace.mnau.edu.ua/jspui/handle/123456789/17107
Название: Активні методи і форми навчання та інноваційні підходи у закладах вищої освіти
Авторы: Гула, Лариса Вікторівна; Gula, Larysa
2024-01-01T00:00:00Z
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Переваги дистанційного навчання інженера аграрної галузі
https://dspace.mnau.edu.ua/jspui/handle/123456789/17106
Название: Переваги дистанційного навчання інженера аграрної галузі
Авторы: Бацуровська, Ілона Вікторівна; Batcurovskaya, Ilona; Курепін, Вячеслав Миколайович; Kurepin, Vyacheslav; Лимар, Олександр Олександрович; Lymar, Oleksandr
2024-01-01T00:00:00Z