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Your search keyword '"Tkachenko, Mycola"' showing total 4 results
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4 results on '"Tkachenko, Mycola"'

2. Study of Microbiological Processes in the Soil of a Two-Year Fallow.

Author

Malynovska, Iryna, Tkachenko, Mycola, Bulgakov, Volodymyr, Ptashnik, Mykhailo, and Ivanovs, Semjons

Subjects
GRASS growing, FALLOWING, ARABLE land, FOREST soils, SOILS, MINERALS in nutrition
Abstract

A high degree of ploughing the soils is a destabilization factor of agrolandscapes and intensification of the erosion processes. Therefore, there arises a need to study the direction of the soil processes during the transfer of the arable land into a state of fallow. The state of microbiocenosis of a two-year-old abandoned land (fallow) was investigated using the gray forest soil in the variants of spontaneous overgrowth, sowing of grass mixtures and sowing of grass mixtures with simultaneous optimization of mineral nutrition of the phytocenosis as an example. It has been established that the least stable microbiocenosis is formed during the cultivation of the grass mixtures, which is characterized by the minimum total number of microorganisms (647.1 million CFU·g-1 of absolutely dry soil) and the minimum number of significant relations between the constituents (components) of the microbial community (98). The total number of microorganisms in the microbiocenosis of the spontaneous overgrowth variant and the legume-grass mixture exceeds that of the cereal grass mixture variant by 6.29 and 34.8%, respectively. A similar indicator for the total number of significant relations was 4.08%. Application of mineral fertilizers intensifies the process of mineralization of nitrogen compounds and slows down the consumption of the soil organic matter in the variants of sudden recovery of phytocenosis and cultivation of the legume-cereal grass mixture. The soil of the variant of the grass mixture is characterized by minimum total biological activity; it is 1.33 and 33.2% lesser than the total biological activity of the variants of spontaneous overgrowth and cultivation of the legume-grass mixture. [ABSTRACT FROM AUTHOR]

Published
2023
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3. INVESTIGATION OF CONTACT STRESSES IN ENGAGEMENT ELEMENTS OF SCREW CONVEYOR SAFETY CLUTCH.

Author

Bulgakov, Volodymyr, Trokhaniak, Oleksandra, Aboltins, Aivars, Rucins, Adolfs, Tkachenko, Mycola, Almeida, Arlindo, and Kuvachov, Volodymyr

Subjects
*SCREW conveyors, *ENGINEERING design, *DISPLACEMENT (Mechanics), *WEAR resistance, *CLUTCHES (Machinery)
Abstract

In the article there is presented the design of a safety clutch for a screw conveyor with time-separated modes of slipping and axial displacement of the screw for automatic restoration of the operating condition in the event of overload. A calculation has been made using contact stresses in the engagement elements of the safety device, the level of which is the determining indicator that affects the wear rate of the contact surfaces. Using the SolidWorks Premium software diagrams of the distribution of contact stresses during operation of the safety clutch were constructed, by the results of which it was established that the analytical dependencies, presented in the article, can be used in the engineering design of various standard sizes of this protective mechanism. [ABSTRACT FROM AUTHOR]

Published
2024
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4. EXPERIMENTAL RESEARCH ON PERFORMANCE OF FLEXIBLE SCREW CONVEYOR WHEN TRANSPORTING AGRICULTURAL MATERIALS.

Author

Bulgakov, Volodymyr, Ivanovs, Semjons, Beloev, Ivan, Trokhaniak, Oleksandra, Aboltins, Aivars, Tkachenko, Mycola, Rucins, Adolfs, and Ihnatiev, Yevhen

Subjects
*CONVEYING machinery, *AGRICULTURAL mathematics, *FLOW coefficient, *SUSTAINABLE development, *TRANSPORTATION
Abstract

The paper presents the design of a flexible screw conveyor working body and a laboratory setup for experimental studies of determining its performance in transporting agricultural materials. Studies of conveying capacity have allowed to determine its dependence on many factors that characterize the process, namely: screw rotation frequency n, coefficient φ of line filling, inner diameter of the pipeline shell D. To determine the effect of these parameters on the performance of the screw conveyor, a full-factor experiment was conducted, the results of which showed that the dominant factor influencing the performance value is the rotation frequency of the working body n, and the least influential is the diameter of the housing D, but the value of the cooefficient φ of the main also has a significant effect on the performance of the transportation process. So, when changing the rotation frequency of the working body within the range of 300...800 rpm, the productivity increases by 50% for barley and 48% for industrial salt, when changing the line filling ratio within the range of 0.3...0.5, the productivity increases by 16% for barley and 18% for industrial salt, and when changing the pipeline diameter D from 0.08 m to 0.1 the productivity increases by 0.7% for barley and 0.2% for industrial salt. [ABSTRACT FROM AUTHOR]

Published
2023

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