In Russian Federation, absent regulation document for criteria and methods evaluating screening properties of protective means against radio frequency electromagnetic fields necessitates development of general principles and methods for indivual protective means testing. Findings are that indivual protective means testing are expedient with consideration of measurements in free space and evaluation of absorbed electromagnetic energy in tissue-equivalent phantoms. Screening coefficient should be assessed in several zones corresponding to location of human vital organs.
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Sensors (Basel)
December 2024
Zhejiang Institute of Mechanical & Electrical Engineering Co., Ltd., Hangzhou 310051, China.
This study addresses the challenges of magnetic circuit coupling and control complexity in active radial magnetic bearings (ARMBs) by systematically investigating the electromagnetic performance of four magnetic pole configurations (NNSS, NSNS, NNNN, and SSSS). Initially, equivalent magnetic circuit modeling and finite element analysis (FEA) were employed to analyze the magnetic circuit coupling phenomena and their effects on the magnetic flux density distribution for each configuration. Subsequently, the air gap flux density and electromagnetic force were quantified under rotor eccentricity caused by unbalanced disturbances, and the dynamic performances of the ARMBs were evaluated for eccentricity along the x-axis and at 45°.
View Article and Find Full Text PDFPolymers (Basel)
December 2024
School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China.
In this study, CO reacted with a curing agent through nucleophilic addition to form ammonium salts, enabling the stable capture and internal release of CO, which achieved gas-phase nucleation and foaming. Additionally, the introduction of wave-absorbing agents improved the absorption mechanism and promoted uniform foaming. This nucleation-free foaming process relies on the induced growth of gas nuclei and the synergistic effect of the wave-absorbing agents, effectively preventing the uneven foaming issues caused by traditional nucleating agents.
View Article and Find Full Text PDFMicromachines (Basel)
December 2024
Key Laboratory of Near-Range RF Sensing ICs and Microsystems (NJUST), Ministry of Education, School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
This paper presents a modularized reconfigurable functional electromagnetic surface (MRFES) for broadband absorption and polarization conversion by using tightly coupled dipole antennas (TCDA) and back-loaded radio frequency (RF) circuits (BLRFC). A dual-polarized antenna array with tight coupling and wide angular scanning characteristics is designed. By loading different RF circuits on the back side of the antenna array's ground plane, switchable broadband absorption and polarization conversion functions are achieved.
View Article and Find Full Text PDFMicromachines (Basel)
November 2024
College of Electronic Information Engineering, Changchun University of Science and Technology, Changchun 130022, China.
Metamaterial absorbers have gained widespread applications in fields such as sensing, imaging, and electromagnetic cloaking due to their unique absorption characteristics. This paper presents the design and fabrication of a novel K-band polarization-sensitive metamaterial absorber, which operates in the frequency range of 20.76 to 24.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Interdisciplinary Centre for Preclinical and Clinical Research, College of Natural Sciences, University of Rzeszow, Werynia 2a, 36-100 Kolbuszowa, Poland.
Degenerative retinal diseases can lead to blindness if left untreated. At present, there are no curative therapies for retinal diseases. Therefore, effective treatment strategies for slowing the progression of retinal diseases and thus improving patients' life standards are urgently needed.
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