scholarly journals Experimental studies in heating oil-saturated rock with high-frequency electromagnetic field

2019 ◽  
Vol 1333 ◽  
pp. 062010
Author(s):  
L A Kovaleva ◽  
R Z Minnigalimov ◽  
R A Nafikova ◽  
R R Zinnatullin ◽  
R F Sultanguzhin
2021 ◽  
Vol 939 (1) ◽  
pp. 012020
Author(s):  
U Khaliknazarov ◽  
D Akbarov ◽  
A Tursunov ◽  
S Gafforov ◽  
D Abdunabiev

Abstract The report of introduced techniques and theoretical, analytical and experimental studies of foreign and our national scientists in recent years are given in this article. it has been established that treatment with a high frequency electromagnetic field achieves a high efficiency in drying the cocoon and killing pupae. The shell of the cocoon does not heat up with this method. This is explained by the fact that the high frequency energy is absorbed mainly in the pupa because of the difference of the dielectric constant, which leads to the heating of the pupa to 90-95 ° C and they die within 30 seconds depending on the power.


Author(s):  
N.V. Solovievа ◽  
O. M. Petrovskiy ◽  
O.E. Ilyash ◽  
N.I. Kolesnikova ◽  
T. Yu. Kuznetsova ◽  
...  

The article presents the results obtained by testing the previously proposed physical and mathematical model of the temperature distribution in the layer of poured seeds when irradiated with a high-frequency electromagnetic field. It has been proven that temperature is one of the factors influencing the consequences of pre-sowing seed treatment. We have found out that, along with heating, other physical processes occur in the seed structure at the level of cell membranes and membrane transport of substances. The transformation of protein structures, the polarization of cell membranes, and the intensification of metabolic processes under the influence of irradiation can lead to changes in the electrical properties of seeds and, as a consequence, can impact on the physiological state, germinability and growth energy of plants. The result of the seed exposure to high-frequency electromagnetic field depends on the electrical characteristics of the seeds. We have developed a technology for the pre-sowing treatment of Echinacea and Valerian seeds in order to obtain more ecologically pure raw materials for pharmacological industry. The study has demonstrated positive thermal and oscillation effects produced by the electromagnetic field on the structural elements of seeds. Based on the method of presowing stimulation of the seeds with a high-frequency electromagnetic field, the optimal modes for irradiation of Echinacea and Valerian seeds have been elaborated. It has been established that boosting the overall resistance of biological tissue, an increase in the polarization of cell membranes indicates an enhancement of metabolic processes and, as a result, stimulates the process of seed germination and rapid vegetation in the early stages of plant development. Theoretical calculations and experimental studies have evidenced positive results doe to implementation of the described technology.


2020 ◽  
Vol 39 (1) ◽  
pp. 368-376
Author(s):  
Xingjuan Wang ◽  
Hebin Jin ◽  
Liguang Zhu ◽  
Ran Liu ◽  
Tushun Song

AbstractSoft-contact of molten steel can be achieved by applying a high-frequency electromagnetic field above the mold of continuous casting, which can effectively eliminate surface defects and achieve billets with no cracks and no oscillation marks. It also has some influence on the mold flux. In this study, the effect of a high-frequency electromagnetic field (20 kHz) on a mold flux flow field was simulated using a finite element software, and the slag film was extracted using a slag film simulator. The effect of the high-frequency magnetic field on the microstructure of the mold flux was analyzed using X-ray diffraction, Raman spectroscopy, and mineral phase testing. The results show that the high-frequency electromagnetic field disrupts the orderly movement and increases the movement rate of the liquid flux. The precipitate phase of the slag film did not change, but the silicate dimer Q1 decreased, the chain Q2 increased, and the network degree was increased. The slag film structure changed from the original two-layer form of crystalline layer–glass layer into a three-layer form of crystal layer–glass layer–crystal, and the crystallization ratio increased by 35% on average. The grain-size melilite granularity was reduced from the original 0.12 to 0.005 mm.


Author(s):  
О. М. Петровський

Розглянуті питання передпосівної стимуляції на-сіння високочастотним електромагнітним полем.Запропоновано спосіб опромінення насіння і визна-чення його електричних характеристик. На основібудови клітин визначені електричні властивості біо-логічної тканини, з якої складається насіння. Пока-зана зміна складових активного опору в залежностівід частоти струму. Експериментально доведено,що еквівалентну електричну схему неможливо звес-ти до простих випадків з’єднання опорів і ємностей,а саме насіння не можна вважати нейтральнимдіелектриком. Розроблена методика оцінки інтенси-вності обмінних процесів залежно від електричногоопору насіння. The questions of stimulation of seed before sowing are considered by the high-frequency electromagnetic field considered. The method of irradiation of seed and determination of him is offered electric descriptions. On the basis of structure of cages electric properties of biological fabric which seed consist of are certain. The change of constituents of active resistance is shown depending on frequency of current. It is experimentally proved that it is impossible to erect an equivalent electric chart to the simple cases of connection of resistances and capacities, namely seed can not be considered a neutral dielectric. The method of estimation of intensity of exchange processes  is developed depending on electric resistance of seed.


RSC Advances ◽  
2021 ◽  
Vol 11 (50) ◽  
pp. 31408-31420
Author(s):  
Palalle G. Tharushi Perera ◽  
Nevena Todorova ◽  
Zoltan Vilagosh ◽  
Olha Bazaka ◽  
The Hong Phong Nguyen ◽  
...  

Membrane model systems capable of mimicking live cell membranes were used for the first time in studying the effects arising from electromagnetic fields (EMFs) of 18 GHz where membrane permeability was observed following exposure.


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