Tag Archives: modeling

xxx I. Laktionov, O. Vovna, O. Cherevko and T. Kozlovskaya
Mathematical model for monitoring carbon dioxide concentration in industrial greenhouses
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Mathematical model for monitoring carbon dioxide concentration in industrial greenhouses

I. Laktionov¹*, O. Vovna¹, O. Cherevko² and T. Kozlovskaya³

¹State Higher Educational Institution 'Donetsk National Technical University', Ministry of Education and Science of Ukraine, Department of Electronic Engineering, Shibankova sq., 2, UA85300 Pokrovsk, Ukraine
²State Higher Educational Institution 'Priazovsky State Technical University', Ministry of Education and Science of Ukraine, Department of Automation and Computer Technologies, University str., 7, UA87500 Mariupol, Ukraine
³Kremenchuk Mykhailo Ostohradskyi National University, Department of biotechnologies and bioengineering, Pershotravneva str., 20, UA39600, Kremenchuk, Ukraine
*Correspondence: ivan.laktionov@donntu.edu.ua

Abstract:

Processes of monitoring and control the industrial greenhouses microclimate play a decisive role in growing crops under protected cultivation. Providing optimal climatic conditions in the production process of greenhouse agricultural products requires solving the scientific and applied problem of developing and researching a mathematical model for monitoring carbon dioxide concentration in industrial greenhouses. The proposed model takes into account the processes of diffusion and absorption of carbon dioxide, the geometric parameters of greenhouses, as well as the types and vegetation periods of crops grown under protected cultivation. Time characteristics of the carbon dioxide dynamics process under greenhouse conditions are estimated. Quantitative estimates of the diffusion transfer duration and carbon dioxide absorption are made for indeterminate varieties of tomatoes during planting and fruiting periods. Recommendations are given on the development of an adaptive methodology for the functioning and structural and algorithmic organization of computerized monitoring and management system for carbon dioxide top-dressing modes for greenhouse crops. The necessity of improving the proposed mathematical model and confirming the adequacy of its implementation efficiency on yield indicators of greenhouse crops is substantiated.

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886–896 K. Soots,, O. Krikmann, M. Starast and J. Olt
Determining the dimensional characteristics of blueberries
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Determining the dimensional characteristics of blueberries

K. Soots¹,*, O. Krikmann², M. Starast³ and J. Olt¹

¹ Estonian University of Life Sciences, Institute of Technology, Department of Agricultural and Production Engineering, Fr.R. Kreutzwaldi 56, 51014 Tartu, Estonia
² Estonian University of Life Sciences, Institute of Technology, Department of Physics, Fr.R. Kreutzwaldi 56, 51014 Tartu, Estonia
³ Estonian University of Life Sciences, Institute of Agricultural and Environmental Sciences, Department of Horticulture, Fr.R. Kreutzwaldi 5, 51014 Tartu, Estonia
*Correspondence: kaarel.soots@emu.ee

Abstract:

The smoothly adjustable belt drums of belt sorters can be used in the processing of harvested blueberries. Previous tests with the smoothly-adjustable belt drums of belt sorters indicates the fact that further improvements are required to increase their sorting efficiency and uniformity. For this, the relationship between the dimensional characteristics of blueberries needs to be studied. The aim of this study is to determine connections between the dimensional characteristics of blueberries. To fulfil this aim, the length, diameter, mass, and volume are measured in an experimental group of blueberries. Based on these measuring results, mathematical equations are compiled in order to describe the connections between the dimensional characteristics of blueberries. The mathematical equations obtained are tested with a control group of blueberries. The results show that the volume of blueberries can most accurately be estimated by using a mathematical equation which takes into account the mass of blueberries. The mass of blueberries can most accurately be estimated with a mathematical equation which takes into account the diameter and length of the blueberries. Based on the results obtained, we can conclude that blueberry dimensional characteristics are linked and that these links can be used for various purposes.

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