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1

Effect of magnetic fields and fertilizers on grass and onion growth on technogenic soils

Vasilyeva Maria, Kovshov Stanislav, Zambrano Johnny, Zhemchuzhnikov Maxim

Journal of Water and Land Development

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2021

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no. 49

55--62

EN

The article deals with effect the use of organic (biohumus) and mineral (biochar) fertilizers based on the products of chicken vital activity on changing the fertility of technogenic sod-podzolic soils exposed to constant and unstable magnetic fields. The germination and growth dynamics of grasses and onions were investigated. The rational rate of introduction of the studied fertilizers into the technogenic soil is determined. Running (RMF) and direct (DMF) magnetic fields were applied in two ways: with fertilizers added and without fertilizers added. It has been established that the effect of preliminary magnetization of technogenic soil has a significant effect on lawn grass germination and the length of onion feathers, which are more than twice the height when exposed to the RMF, as compared with DMF. The effect of RMF on grass germination was also twice as high for DMF, when fertilizers were added. The DMF magnetization and biohumus helps to increase the grass sprout height by 10–20%. Onion sprouts were higher in two cases: DMF and biohumus; RMF and biochar. The influence of the factor of fertilizer type has a significant effect in 30–40% of cases, whilst at a spread rate of more than 5%, significant chemical activity of biochar negatively affects the germination of both grass and onion.

2

Studies of a mixing process induced by a rotating magnetic field with the application of magnetic particles

Rakoczy Rafał, Kordas Marian, Markowska-Szczupak Agata, Konopacki Maciej, Augustyniak Adrian, Jabłońska Joanna, Paszkiewicz Oliwia, Dubrowska Kamila, Story Grzegorz, Story Anna, Ziętarska Katarzyna, Sołoducha Dawid, Borowski Tomasz, Roszak Marta, Grygorcewicz Bartłomiej, Dołęgowska Barbara

Chemical and Process Engineering

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2021

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Vol. 42, nr 2

157-–172

EN

We demonstrate in this study that a rotating magnetic field (RMF) and spinning magnetic particles using this kind of magnetic field give rise to a motion mechanism capable of triggering mixing effect in liquids. In this experimental work two mixing mechanisms were used, magnetohydrodynamics due to the Lorentz force and mixing due to magnetic particles under the action of RMF, acted upon by the Kelvin force. To evidence these mechanisms, we report mixing time measured during the neutralization process (weak acid-strong base) under the action of RMF with and without magnetic particles. The efficiency of the mixing process was enhanced by a maximum of 6.5% and 12.8% owing to the application of RMF and the synergistic effect of magnetic field and magnetic particles, respectively

3

The influence of low frequency magnetic field upon cultivable plant physiology

Rochalska M.

Nukleonika

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2008

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Vol. 53, suppl. 1

17-20

EN

The 16 Hz frequency and 5 mT magnetic flux density as well as alternating magnetic field influence the field germination physiological yield-forming features and the yield of sugar have been investigated. The profitable influence of the investigated factor at physiological yield-forming features, causing an increase in sugar beet root and leaf yield, was shown. The beneficial influence on the yield is especially clear in unfavourable weather conditions.

4

Analiza separacji magnetycznej w separatorach płytowych

Brożek M.

Gospodarka Surowcami Mineralnymi

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2005

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T. 21, z. 1

111--129

PL

Magnetycznemu wzbogacaniu surowców drobnoziarnistych, szczególnie na sucho, towarzyszy zjawisko flokulacji magnetycznej, której intensywność jest zależna od własności magnetycznych składników separowanej mieszaniny. Dla zredukowania skutków tego zjawiska stosuje się między innymi separację w przemiennym polu magnetycznym. Takie pole generowane jest w separatorach płytowych z poruszającym się polem magnetycznym. W artykule przeprowadzono analizę rozdziału w separatorach płytowych opierając się na heurystycznym modelu rozdziału. Wykorzystując rozwiązanie równań Maxwella wyznaczono rozkład pola magnetycznego i siły magnetycznej działającej na ziarno w przestrzeni roboczej separatora. Wychodząc z równania bilansu wszystkich sił działających na ziarno wyprowadzono zależność uzysku oraz zawartości składnika magnetycznego w produkcie magnetycznym od czynników wpływających na proces, takich jak: wielkość ziaren, gęstość ziaren magnetycznych, podatność magnetyczna ziaren magnetycznych i niemagnetycznych, natężenie pola magnetycznego, częstość zmian pola, właściwości powierzchniowe ziaren oraz długość drogi separacji. W wyprowadzonych wzorach zweryfikowano zależność uzysku od długości drogi separacji i właściwości magnetycznych składnika niemagnetycznego oraz zależność zawartości składnika magnetycznego w produkcie magnetycznym od wielkości ziaren, otrzymując dobrą zgodność z eksperymentem.

EN

Magnetic dry enrichment of fine raw materials is accompanied by the phenomenon of magnetic flocculation the intensity of which depends on magnetic properties of the separated mixture. The separation in the aIternating magnetic field is applied to reduce this phenomenon. Such a field is generated in plate separators with a moving magnetic field. The paper analyses the separation in plate separators, based on the heuristic model of separation. Applying the solution of Maxwell's equations the author determined the distribution of magnetic field and magnetic force, acting on the particle in the separator working zone. Starting from the equation of balance of all forces acting upon the particle the author derived the dependenee of recovery and content of the magnetic component in the magnetic product on the factors affecting the process, such as particie size, density of magnetic particles, magnetic susceptibility of magnetic and non-magnetic particles, magnetic field intensity, frequency of field alterations, surface properties of particles and length of separation path. The derived formulas verified the dependence of recovery upon the length of separation path and magnetic properties of the non-magnetic component as well as the dependence of the content of the magnetic component in the magnetic product on particle size, obtaining good compatibility with the experiment.

5

Eddy current calculation in the circular sample of the two-phase rotational single sheet tester

Jesenik M., Gorican V., Trlep M., Hamler A., Stumberger B.

Journal of Technical Physics

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2002

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Vol. 43, no 4

411-416

EN

Round rotational single sheet tester (R.R.S.S.T.) is used for the measurement of magnetic properties in rotational and alternating magnetic fields. The homogeneity of the magnetic field and the influence of eddy currents on the homogeneity of the magnetic field distribution in the circular sample are investigated. Results of the calculation are compared with results of the measurements.