Nested Helmholtz coil design for producing homogeneous transient rotating magnetic fields

Podaru, George; Moore, John; Dani, Raj Kumar; Prakash, Punit; Chikán, Viktor

doi:10.1063/1.4908173

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…To produce a uniform field throughout this complex no metal parts were used. In this study the induced current was 50 Hz at an intensity of 100 μT [ 61 ].…”

Section: Methodsmentioning

confidence: 99%

Maternal stress induced anxiety-like behavior exacerbated by electromagnetic fields radiation in female rats offspring

et al. 2022

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There is a disagreement on whether extremely low frequency electromagnetic fields (ELF-EMF) have a beneficial or harmful effect on anxiety-like behavior. Prenatal stress induces frequent disturbances in offspring physiology such as anxiety-like behavior extending to adulthood. This study was designed to evaluate the effects of prenatal stress and ELF-EMF exposure before and during pregnancy on anxiety-like behavior and some anxiety-related pathways in the hippocampus of female rat offspring. A total of 24 female rats 40 days of age were distributed into four groups of 6 rats each: control, Stress (rats whose mothers underwent chronic stress), EMF (rats whose mothers were exposed to electromagnetic fields) and EMF/S (rats whose mothers were simultaneously exposed to chronic stress and ELF-EMF). The rats were given elevated plus-maze and open field tests and then their brains were dissected and their hippocampus were subjected to analysis. ELISA was used to measure 24(S)-hydroxy cholesterol, corticosterone, and serotonin levels. Cryptochrome2, steroidogenic acute regulatory protein, 3B-Hydroxy steroid dehydrogenase, N-methyl-D-aspartate receptor 2(NMDAr2) and phosphorylated N-methyl-D-aspartate receptor 2(PNMDAr2) were assayed by immunoblotting. Anxiety-like behavior increased in all treatment groups at the same time EMF increased anxiety induced by maternal stress in the EMF/S group. The stress group showed decreased serotonin and increased corticosterone levels. ELF-EMF elevated the PNMDAr2/NMDAr2 ratio and 24(S)-hydroxy cholesterol compared to the control group but did not change corticosterone. EMF did not restore changes induced by stress in behavioral and molecular tests. The results of the current study, clarified that ELF-EMF can induce anxiety-like behavior which may be attributed to an increase in the PNMDAr2/NMDAr2 ratio and 24(S)-OHC in the hippocampus, and prenatal stress may contribute to anxiety via a decrease in serotonin and an increase in corticosterone in the hippocampus. We also found that anxiety-like behavior induced by maternal stress exposure, is exacerbated by electromagnetic fields radiation.

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“…To produce a uniform field throughout this complex no metal parts were used. In this study the induced current was 50 Hz at an intensity of 100 μT [ 61 ].…”

Section: Methodsmentioning

confidence: 99%

Maternal stress induced anxiety-like behavior exacerbated by electromagnetic fields radiation in female rats offspring

et al. 2022

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“…1(b)). The generation of a rotating magnetic eld with two pairs of coils perpendicular to each other has been reported earlier [22]. Instead of two pairs of coils (a total of four), three coils (Fig.…”

Section: IIImentioning

confidence: 67%

A minimalistic magnetic manipulation system for manouvering nanorobots

Goswami

Ghosh

Dasgupta

2023

Preprint

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Magnetic nanorobots require elaborate magnetic field patterns to move. Sophisticated magnetic coils have been designed to cater to such experiments. However, under laboratory conditions space and temperature control presents constraints that often need to be overcome. Here we report a minimalistic coil system that is easily portable and accounts for space constraints near a compound microscope. In a volume of 10 mm×10 mm×10 mm working space a uniform rotating magnetic field with a maximum field strength of 15 mT can be achieved with our design. The three-coil system can be helpful for manipulating helical magnetic nanorobots inside mechanically complex media like, biological fluids where a greater magnetic field is desirable to induce maneuverability. It is possible to achieve our goal of controlling magnetic nanorobots inside living animals wirelessly soon while simultaneously imaging them through an optical microscope with this electromagnetic coil assembly.

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“…As a perspective, another method can be suggested to control the magnetic field and therefore the frequency variation through electrical excitation. One magnetic circuit of interest is the coils of Helmholtz [39]. The resonant frequency varies from 30.191 to 32 GHz presenting a margin of ΔFr = 1.809 GHz.…”

Section: Discussionmentioning

confidence: 99%

Magnetically tuned SIW patch antenna based on nematic liquid crystal for 5G applications and satellite communication systems

Kouki

Sboui

Latrach

2023

Int. J. Microw. Wireless Technol.

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This paper presents a new design of a reconfigurable miscrostrip patch antenna based on a substrate-integrated waveguide (SIW). The antenna is resonant at the millimeter-wave (mmWave) 5G spectrum. The tuning technique consists of using a nematic liquid crystal (K15). An adjustable frequency band from 30.191 to 32 GHz is obtained, giving a tunable range of Δfr = 1.809 GHz. The maximum gain and efficiency reach the values of 7.61 and 9.07 dBi and 93 and 94%, respectively. The proposed SIW antenna loaded with liquid crystal was fabricated and tested. The experimental results correlated well with the simulation; however, the measured reflection coefficient plot shows a shift of the tuning range of 284 MHz, which is an acceptable outcome compared to simulation. A new approach of adopting the magnetic field as a technique to tune the resonance frequency has been used. The structure is characterized by its design simplicity, compactness, and fabrication process. The proposed antenna proves that the liquid crystal improves the performance of the antenna in the Ka band for 5G applications and satellite communication systems.

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Nested Helmholtz coil design for producing homogeneous transient rotating magnetic fields

Cited by 9 publications

References 18 publications

Maternal stress induced anxiety-like behavior exacerbated by electromagnetic fields radiation in female rats offspring

Maternal stress induced anxiety-like behavior exacerbated by electromagnetic fields radiation in female rats offspring

A minimalistic magnetic manipulation system for manouvering nanorobots

Magnetically tuned SIW patch antenna based on nematic liquid crystal for 5G applications and satellite communication systems

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