scholarly journals Ultra High-Frequency Electric Installation with a Hybrid-Type Working Chamber

2021 ◽  
Vol 8 (6) ◽  
pp. 937-944
Author(s):  
Midhat Tuhvatullin ◽  
Yuri Arkhangelsky ◽  
Rustam Aipov ◽  
Eduard Khasanov
Keyword(s):  
Thermal Conductivity ◽  
Electromagnetic Field ◽  
Thermal Radiation ◽  
High Frequency ◽  
Dielectric Materials ◽  
Working Chamber ◽  
Ultra High Frequency ◽  
Hybrid Type ◽  
Electromagnetic Oscillations

Ultra-high frequency (UHF) electric installations, using the energy of UHF electromagnetic oscillations, can perform thermal UHF modification of dielectric materials and products. As a result, its properties and parameters change in an object processed in a UHF electromagnetic field faster and more uniformly than when the heat is transferred to a heated dielectric by thermal conductivity, convection, thermal radiation. The exact change in the properties and parameters of polymers of living and inanimate nature, uniform in volume and significantly in a shorter time spent in a UHF electromagnetic field, can be obtained in UHF electrical installations, and practically without heating the object as a result of the so-called non-thermal UHF modification. The paper proposes the design and design of a UHF electric installation with a hybrid-type working chamber. Such a working chamber makes it possible to simultaneously carry out non-thermal UHF modification of a polymer and thermal UHF modification of a dielectric in one installation. A UHF electric installation with a hybrid-type working chamber is cheaper. It takes up less space than two separate installations producing the same products with the same productivity.

scholarly journals Design of a UHF Antenna for Partial Discharge Detection of Power Equipment

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Youyuan Wang ◽  
Junfeng Wu ◽  
Weigen Chen ◽  
Yajun Wang
Keyword(s):  
High Frequency ◽  
Microstrip Antenna ◽  
Partial Discharge ◽  
Dielectric Materials ◽  
Coaxial Cable ◽  
Detection Sensitivity ◽  
Duty Ratio ◽  
Spiral Antenna ◽  
Archimedean Spiral ◽  
Ultra High Frequency

A single-arm Archimedean spiral antenna that can be directly fed by a 50 Ωcoaxial cable is investigated in this study. Every antenna parameter is optimized under simulation to make the antenna work in the ultra-high frequency band. The influence of dielectric materials, feed cone angle, and antenna duty ratio is also examined. Partial discharge (PD) experiments on several typical artificial insulation defects are conducted, and a single-arm Archimedean spiral antenna and a typical microstrip antenna are utilized for PD measurement. The PD characteristics of different insulation defects are also analyzed. Results show that the designed antenna is suitable for ultra-high frequency monitoring. The detection sensitivity of the single-arm spiral antenna is superior to that of the ordinary microstrip antenna. The former can be utilized in wide-band measurement fields.

Ultra high frequency-electromagnetic field irradiation during pregnancy leads to an increase in erythrocytes micronuclei incidence in rat offspring

Life Sciences ◽  
2006 ◽  
Vol 80 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Amâncio Romanelli Ferreira ◽  
Tanise Knakievicz ◽  
Matheus Augusto de Bittencourt Pasquali ◽  
Daniel Pens Gelain ◽  
Felipe Dal-Pizzol ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
High Frequency ◽  
Ultra High Frequency ◽  
Rat Offspring ◽  
High Frequency Electromagnetic Field

scholarly journals Effect of heating of frozen colostrum in two-resonator installation

2021 ◽  
Vol 935 (1) ◽  
pp. 012026
Author(s):  
G Novikova ◽  
I Ershova ◽  
M Prosviryakova ◽  
O Mikhailova ◽  
V Storchevoy ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Penetration Depth ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Raw Material ◽  
Dielectric Parameters ◽  
Field Exposure ◽  
Ultra High Frequency ◽  
Significant Difference ◽  
High Frequency Electromagnetic Field

Abstract The study is aimed at the effect substantiation of voluminous heating of the cattle frozen colostrum in the two-resonator installation. The methodology is based on the theory of the electromagnetic field, the laws of thermodynamics and the results of physical modeling. The colostrum dielectric parameters were analyzed in the temperature range from -12 °C to +40 °C. The theoretical studies were carried out for changes finding out in the absorption coefficient of the electromagnetic field and the penetration depth of the electromagnetic waves 12.24 cm long during defrosting/heating of the cow colostrum with the fat content of 6.4%. It is found that the penetration depth of the electromagnetic field into the frozen raw material at negative temperatures range (0.2-1.0 cm) is less than that at the colostrum positive temperatures (1.0-2.17 cm). With such significant difference in the dielectric characteristics of the frozen and thawed colostrum and in their penetration depths of the ultra high frequency electromagnetic field, the rate of their heating is considerably different. The developed continuous-flow ultra high frequency electromagnetic generator contains two voluminous resonators. They provide the colostrum being in different physical states with different doses of the ultra high frequency electromagnetic field exposure.

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