Papers in Press

Papers in the press are accepted peer-reviewed papers published online in manuscript form, but which have not been copyedited and not yet appeared in a regular issue of the journal. Copyediting may lead to small differences between the papers in press version and the final version, therefore please note that titles and content are liable to change during preparation for publication.


Valentyna Bandura1, Boris Kotov2, Sergey Gyrych1, Volodymyr Gricshenko3, Roman Kalinichenko3, Oksana Lysenko1
IDENTIFICATION OF MATHEMATICAL DESCRIPTION OF THE DYNAMICS OF EXTRACTION OF OIL MATERIALS IN THE ELECTRIC FIELD OF HIGH FREQUENCY
In Press
Abstract
IDENTIFICATION OF MATHEMATICAL DESCRIPTION OF THE DYNAMICS OF EXTRACTION OF OIL MATERIALS IN THE ELECTRIC FIELD OF HIGH FREQUENCY
Valentyna Bandura1, Boris Kotov2, Sergey Gyrych1, Volodymyr Gricshenko3, Roman Kalinichenko3, Oksana Lysenko1
1Faculty of Trade, Marketing and Services, Vinnytsia Trade and Economic Institute of Kyiv National Trade and Economic University, Vinnytsia, Ukraine
2Faculty of Engineering and Technology, State Agrarian and Engineering University in Podilia, Kamianets-Podilskyi, Ukraine
3Faculty of Engineering and Energy, National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine
One of the most important stages of the technological process of extraction of target components from oilseeds is extraction. This stage lasts the longest, and therefore, it generally determines the speed and cost-effectiveness of the whole process. A promising direction for effective organization of the extraction process is involving microwave technologies, the use of ultra-high frequency electromagnetic field (EHF) microwave energy directly in the technological process.
The complex nature of the interaction of the factors that determine the intensity of the extraction process in the microwave field does not allow establishing (create) an exact mathematical model of extraction. We propose a method of parametric identification of the mathematical description of the extraction dynamics. This method allows determining the kinetic coefficients of the process from one experimental experiment on the existing installation. A simplified process mechanism was chosen for the study and a general description of the phenomena of heat and mass transfer in a capillary-porous body was used for the known general description. The parameters of the obtained model were identified according to experimental studies. The thus obtained model of non-stationary processes can be used to optimize the parameters and automate the technical means of extraction of oil materials.
Keywords: extraction, oil raw material, microwave field, mathematical model, identification.
Source: Agraarteadus, 2021, 32(1):In Press
doi: https://dx.doi.org/10.15159/jas.21.01

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HOW TO CITE
Bandura, V., Kotov, B., Gyrych, S., Gricshenko, V., Kalinichenko, R., Lysenko, O. 2021. Identification of mathematical description of the dynamics of extraction of oil materials in the electric field of high frequency. Agraarteadus, 32(1):In Press. doi: 10.15159/jas.21.01.
 
AUTHOR CONTACT
1Faculty of Trade, Marketing and Services, Vinnytsia Trade and Economic Institute of Kyiv National Trade and Economic University, Vinnytsia, Ukraine
2Faculty of Engineering and Technology, State Agrarian and Engineering University in Podilia, Kamianets-Podilskyi, Ukraine
3Faculty of Engineering and Energy, National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine

 
Highlights: 
  • Physical changes in sunflower seeds are dehydrated by electromagnetic induction and low pressure.
  • The analogue modelling of extraction processes in an electromagnetic field of ultrahigh frequencies was offered.
  • The optimization of the process of extraction of vegetable oil in a microwave field was given.

Ants Bender
EFFECT OF PLANT GROWTH REGULATOR AND ADDITIONAL NITROGEN FERTILIZATION IN SPRING ON THE SEED YIELD AND SEED QUALITY OF TIMOTHY (PHLEUM PRATENSE L.)
In Press
Abstract
EFFECT OF PLANT GROWTH REGULATOR AND ADDITIONAL NITROGEN FERTILIZATION IN SPRING ON THE SEED YIELD AND SEED QUALITY OF TIMOTHY (PHLEUM PRATENSE L.)
Ants Bender
Estonian Crop Research Institute Aamisepa 1, 48309 Jõgeva, Jõgeva County, Estonia
The synergistic effect of the plant growth regulator Moddus 250 EC and nitrogen fertilizer on the seed yield and seed quality of timothy was investigated over a period of four years (2017–2020) in a field trial established with the cultivar 'Tika' in 2016 at the Estonian Crop Research Institute. The trial had three variants: variant 1 – without plant growth regulator (control), variant 2 – plant growth regulator sprayed twice at the rate of 0.4 + 0.4 l ha–1 and variant 3 – plant growth regulator sprayed once at the rate of 0.8 l ha–1. In all three variants there were five nitrogen fertilizer rates between N 70–140 kg ha–1. In the trial the lodging resistance of plant cover was monitored, the height of generative tillers was measured, the seed yield was determined by two-phase combine harvesting and the quality of seed was determined. No lodging of timothy was detected in trial variants throughout all trial years. The increase of nitrogen fertilizer rate did not reliably affect the height of generative tillers, the split application of plant growth regulator shortened the height of generative tillers on the average of four years by 7.4%, and one-time spraying by 6.2%. The use of plant growth regulator did not increase the seed yield, the split application of it even reduced the seed yield. The increase of nitrogen fertilizer rate up to N 122 kg ha–1 increased the seed yield reliably only in the first year of production, but not in the following years. The use of plant growth regulator slowed down seed maturation, in our trials it was confirmed by bigger amounts of seed in the second harvest phase. The increase of nitrogen fertilizer rate and the use of plant growth regulator did not have any effect on seed germination. In the first production year, the 1000 kernel weight increased under the influence of plant growth regulator, in the later years there was no effect. The germination energy of seed somewhat decreased under the influence of plant growth regulator.
Keywords: timothy grass, plant growth regulator, fertilization, lodging resistance, seed yield, seed quality.
Source: Agraarteadus, 2021, 32(1):In Press
doi: https://dx.doi.org/10.15159/jas.21.02

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HOW TO CITE
Bender, A. 2021. Effect of plant growth regulator and additional nitrogen fertilization in spring on the seed yield and seed quality of timothy (Phleum pratense L.). Agraarteadus, 32(1):In Press. DOI: 10.15159/jas.21.02.
Bender, A. 2021. Kasvuregulaatori ja kevadise täiendava lämmastik-väetise mõju põldtimuti (Phleum pratense L.) seemnesaagile ja seemnete kvaliteedile. Agraarteadus, 32(1):In Press. DOI: 10.15159/jas.21.02. (In Estonian)
 
AUTHOR CONTACT
Estonian Crop Research Institute Aamisepa 1, 48309 Jõgeva, Jõgeva County, Estonia

 
Highlights: 
  • Using the growth regulator Moddus 250 EC, it is possible to shorten the length of the straw and thus improve the harvest index.
  • Growth regulator slows down plant growth and shifts the optimal harvesting time a few days later.
  • There was a slight decrease in seed germination energy.
  • A single spray with growth regulator at the beginning of stem elongation is more effective.
  • Additional nitrogen may be applied to a seed field in good condition using a growth regulator.

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