scholarly journals Compact Exposimeter Device for the Characterization and Recording of Electromagnetic Fields from 78 MHz to 6 GHz with Several Narrow Bands (300 kHz)

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7395
Author(s):  
Marco Xavier Rivera Rivera González ◽  
Nazario Félix Félix González ◽  
Isabel López ◽  
Juan Sebastián Ochoa Ochoa Zambrano ◽  
Andrés Miranda Miranda Martínez ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Cross Talk ◽  
Strong Correlation ◽  
Field Studies ◽  
Residential Area ◽  
Spectrum Analyzer ◽  
Multiple Sources ◽  
Entire Spectrum ◽  
Narrow Bands

A novel compact device with spectrum analyzer characteristics has been designed, which allows the measuring of the maximum power received in multiple narrow frequency bands of 300 kHz, recording the entire spectrum from 78 MHz to 6 GHz; the device is capable of measuring the entire communications spectrum and detecting multiple sources of electromagnetic fields using the same communications band. The proposed device permits the evaluation of the cross-talk effect that, in conventional exposimeters, generates a mistake estimation of electromagnetic fields. The device was calibrated in an anechoic chamber for far-fields and was validated against a portable spectrum analyzer in a residential area. A strong correlation between the two devices with a confidence higher than 95% was obtained; indicating that the device could be considered as an important tool for electromagnetic field studies.

Experimental study of the transmission of energy of a microwave electromagnetic field into the oil environment employing a submersible emitter

2021 ◽  
pp. 120-129
Author(s):  
A. F. Sekachev ◽  
V. V. Shalai ◽  
Yu. D. Zemenkov ◽  
A. F. Fitzner ◽  
A. E. Yakovlev
Keyword(s):  
Experimental Study ◽  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Thermal Process ◽  
Oil Industry ◽  
Coaxial Cable ◽  
Transport Systems ◽  
Thermal Imager ◽  
Pipeline Transport ◽  
Optically Transparent

The supply of heat to oil media pumped by pipeline transport systems is one of the main problems in the oil industry. The article describes a method for supplying heat to oil-containing media using the energy of an electromagnetic field. The possibility of releasing surfaces in contact with oil sludge under the influence of electromagnetic fields has been shown by experiment. We describe the design and parameters of a biconical horn radiator of a microwave electromagnetic field operating at a frequency of 2 450 MHz. A method for generating energy and transmitting it to the emitter by means of a coaxial cable is shown. Testing the emitter in oil placed in an optically transparent and radio-tight double-walled tank is presented. The design of the stand allows us to safely examine the thermal process using a thermal imager. The installation made it possible to heat 7 liters of oil at 15 °C in 12 minutes.

scholarly journals Translocation of silica nanospheres through giant unilamellar vesicles (GUVs) induced by a high frequency electromagnetic field

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 ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Membrane Permeability ◽  
Electromagnetic Fields ◽  
High Frequency ◽  
Model Systems ◽  
Membrane Model ◽  
Silica Nanospheres ◽  
Giant Unilamellar Vesicles ◽  
High Frequency Electromagnetic Field ◽  
First Time

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.

scholarly journals Human Gingival Fibroblasts Exposed to Extremely Low-Frequency Electromagnetic Fields: In Vitro Model of Wound-Healing Improvement

2019 ◽  
Vol 20 (9) ◽  
pp. 2108 ◽  
Author(s):  
Erica Costantini ◽  
Bruna Sinjari ◽  
Chiara D’Angelo ◽  
Giovanna Murmura ◽  
Marcella Reale ◽  
...  
Keyword(s):  
Wound Healing ◽  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Wound Repair ◽  
Healing Process ◽  
Low Frequency ◽  
Gingival Fibroblasts ◽  
Field Exposure ◽  
Extremely Low Frequency

Several clinical studies have suggested the impact of sinusoidal and pulsed electromagnetic fields in quickening wound repair processes and tissue regeneration. The clinical use of extremely low-frequency electromagnetic fields could represent a novel frontier in tissue repair and oral health, with an interesting clinical perspective. The present study aimed to evaluate the effect of an extremely low-frequency sinusoidal electromagnetic field (SEMF) and an extremely low-frequency pulsed electromagnetic field (PEMF) with flux densities of 1 mT on a model of oral healing process using gingival fibroblasts. An in vitro mechanical injury was produced to evaluate wound healing, migration, viability, metabolism, and the expression of selected cytokines and protease genes in fibroblasts exposed to or not exposed to the SEMF and the PEMF. Interleukin 6 (IL-6), transforming growth factor beta 1 (TGF-β), metalloproteinase 2 (MMP-2), monocyte chemoattractant protein 1 (MCP-1), inducible nitric oxide synthase (iNOS), and heme oxygenase 1 (HO-1) are involved in wound healing and tissue regeneration, favoring fibroblast proliferation, chemotaxis, and activation. Our results show that the exposure to each type of electromagnetic field increases the early expression of IL-6, TGF-β, and iNOS, driving a shift from an inflammatory to a proliferative phase of wound repair. Additionally, a later induction of MMP-2, MCP-1, and HO-1 was observed after electromagnetic field exposure, which quickened the wound-healing process. Moreover, electromagnetic field exposure influenced the proliferation, migration, and metabolism of human gingival fibroblasts compared to sham-exposed cells. This study suggests that exposure to SEMF and PEMF could be an interesting new non-invasive treatment option for wound healing. However, additional studies are needed to elucidate the best exposure conditions to provide the desired in vivo treatment efficacy.

Effects of Electromagnetic Fields on the Quantum Yield of Free Radicals in Cryptochrome

2019 ◽  
Vol 953 ◽  
pp. 127-132
Author(s):  
Yu Ling Chen ◽  
Du Yan Geng ◽  
Chuan Fang Chen
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Free Radicals ◽  
Free Radical ◽  
Quantum Yield ◽  
Electromagnetic Fields ◽  
Applied Magnetic Field ◽  
Geomagnetic Field ◽  
Quantum Biology ◽  
The Magnetic Field

In this paper, the effects of the quantum yield of free radicals in cryptochrome exposed to different electromagnetic fields were studied through the quantum biology. The results showed that the spikes characteristics was produced in the free radicals in cryptochrome, when it exposed to the applied magnetic field (ω = 50 Hz, B0 = 50 μT). The spikes produced by the electromagnetic field was independent of the changes of polar θ. When the frequency of the magnetic field increased, the spikes characteristics produced in unit time also increased. These results showed that the environmental electromagnetic field could affect the response of organisms to the geomagnetic field by influencing the quantum yield in the mechanism of free radical pair.It provided a basis for studying the influence of environmental electromagnetic field on biology, especially the navigation of biological magnetism.

scholarly journals Evaluations of the Effects of Extremely Low-Frequency Electromagnetic Fields on Growth and Antibiotic Susceptibility ofEscherichia coliandPseudomonas aeruginosa

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
B. Segatore ◽  
D. Setacci ◽  
F. Bennato ◽  
R. Cardigno ◽  
G. Amicosante ◽  
...  
Keyword(s):  
Growth Rate ◽  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Antibiotic Susceptibility ◽  
Low Frequency ◽  
Antibiotic Sensitivity ◽  
Control Groups ◽  
E Coli ◽  
Extremely Low Frequency ◽  
Number Of Cells

We aimed to investigate the effects of exposure to extremely low-frequency electromagnetic fields (2 mT; 50 Hz) on the growth rate and antibiotic sensitivity ofE. coliATCC 25922 andP. aeruginosaATCC 27853. The electromagnetic field treatment significantly influenced the growth rate of both strains when incubated in the presence of subinhibitory concentrations of kanamycin (1 μg/mL) and amikacin (0.5 μg/mL), respectively. In particular, at 4, 6, and 8 h of incubation the number of cells was significantly decreased in bacteria exposed to electromagnetic field when compared with the control. Additionally, at 24 h of incubation, the percentage of cells increased (P. aeruginosa∼42%;E. coli∼5%) in treated groups with respect to control groups suggesting a progressive adaptive response. By contrast, no remarkable differences were found in the antibiotic susceptibility and on the growth rate of both bacteria comparing exposed groups with control groups.

scholarly journals Influence of non-stationary electromagnetic field conditions on ion pick-up at Titan: 3-D multispecies hybrid simulations

2008 ◽  
Vol 26 (3) ◽  
pp. 599-617 ◽  
Author(s):  
S. Simon ◽  
U. Motschmann ◽  
K.-H. Glassmeier
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Three Dimensional ◽  
Magnetospheric Plasma ◽  
Field Conditions ◽  
Shielding Effect ◽  
Tail Region ◽  
Field Orientation ◽  
Time Period ◽  
Tail Structure

Abstract. Titan's interaction with the corotating Saturnian magnetospheric plasma is studied in terms of a three-dimensional electromagnetic hybrid model. This approach treats the electrons as a massless, charge-neutralizing fluid, whereas the ions are represented by macroparticles. The model considers two magnetospheric and three ionospheric ion species. In contrast to any foregoing simulation study, the magnetospheric upstream conditions are not assumed to be stationary, but time variations have been imposed on the electromagnetic fields. The model includes simple periodic distortions of the fields near Titan, the purpose being to illustrate the basic physical mechanisms of ion pick-up in a non-stationary electromagnetic environment. In order to allow a straightforward access to the influence of the electromagnetic field orientation on the pick-up, no variations have been imposed on the density of the impinging magnetospheric plasma. Under stationary upstream conditions, Titan's exospheric tail exhibits a strong asymmetry with respect to the direction of the convective electric field. The simulations show that this characteristic asymmetry cannot develop, if the ambient electromagnetic fields are highly distorted. However, the central tail region directly behind the satellite remains nearly unaffected by the distorted magnetospheric upstream conditions. The central tail where the slow ionospheric species are predominant is able to shield itself against any kind of distortion in the ambient magnetospheric field conditions. The shorter the time period of the distortions, the more efficient is this shielding effect. The dependency of the pick-up on the characteristic time scales of the distortions is discussed in detail for the investigated model cases. Besides, the reaction of Titan's exospheric tail structure on sudden, non-continuous changes of the magnetospheric plasma conditions is analyzed, providing an illustration of some effects that may occur when Titan crosses Saturn's magnetopause.

Electromagnetic field in the nucleus and the Salam–Strathdee phase transitions

1978 ◽  
Vol 56 (1) ◽  
pp. 149-160 ◽  
Author(s):  
H. C. Lee ◽  
F. C. Khanna
Keyword(s):  
Phase Transition ◽  
Electromagnetic Field ◽  
Phase Transitions ◽  
Electromagnetic Fields ◽  
Normal Values ◽  
Cabibbo Angle ◽  
Existing Data

Electromagnetic fields in the interior of the nucleus (hypernucleus) as well as inside the constituent nucleons (hyperons) are calculated. The results are discussed in the context of the Salam–Strathdee phase transition in connection with the possible vanishing of the Cabibbo angle. We show that existing data constrain the minimal range of 'normal' values for the invariant [Formula: see text] to be [Formula: see text]. Interestingly, in many Λ-hypernuclei [Formula: see text] is outside this minimal range.

ULTRASLOW SOLITONS VIA FOUR-WAVE MIXING IN A CRYSTAL OF MOLECULAR MAGNETS

2009 ◽  
Vol 23 (07) ◽  
pp. 989-1004
Author(s):  
LIUGANG SI ◽  
XINYOU LÜ ◽  
PEIJUN SONG ◽  
JIBING LIU
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Group Velocity ◽  
Electromagnetic Fields ◽  
Continuous Wave ◽  
Four Wave Mixing ◽  
Molecular Magnets ◽  
Wave Mixing ◽  
Bright Solitons ◽  
Rotating Wave

The authors theoretically investigate the formation of ultraslow dark and bright solitons via four-wave mixing (FWM) in a crystal of molecular magnets in the presence of a uniform d.c. magnetic field, where two strong continuous wave pump electromagnetic fields and a weak-pulsed probe electromagnetic field produce a pulsed FWM electromagnetic field. By solving the Maxwell–Schrödinger equations under the slowly varying envelope approximation and rotating-wave approximations, we demonstrate that both the weak-pulsed probe and FWM electromagnetic fields can evolve into dark and bright solitons with the same shape and the same ultraslow group velocity.

Sign in / Sign up

Export Citation Format

Share Document