keyword
MENU ▼
Read by QxMD icon Read
search

Electromagnetic Radiation

keyword
https://www.readbyqxmd.com/read/28434276/exposure-to-mobile-phone-900-1800%C3%A2-mhz-during-pregnancy-tissue-oxidative-stress-after-childbirth
#1
Mohammad Hossein Bahreyni Toossi, Hamid Reza Sadeghnia, Maryam Mohammad Mahdizadeh Feyzabadi, Mahmoud Hosseini, Mahdiyeh Hedayati, Razieh Mosallanejad, Farimah Beheshti, Zeynab Alizadeh Rahvar
BACKGROUND: The present study has investigated the effects of mobile phone (900-1800 MHz)-induced electromagnetic radiation on redox status in the heart, liver, kidney, cerebellum, and hippocampus of dams and the offspring mice. MATERIALS AND METHODS: Pregnant Balb/C were divided into two groups including the control and the experimental group. The experimental group was exposed to mobile phone (900-1800 MHz), during pregnancy (2 h/d for 20 d). The dams and the offspring of both groups were sacrificed and tissues of interest were harvested immediately after delivery...
April 23, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28430248/accurate-determination-of-dielectric-permittivity-of-polymers-from-75%C3%A2-%C3%A2-ghz-to-1-6%C3%A2-%C3%A2-thz-using-both-s-parameters-and-transmission-spectroscopy
#2
Tianying Chang, Xiansheng Zhang, Xiaoxuan Zhang, Hong-Liang Cui
Interactions of terahertz (THz) electromagnetic radiation with polymer materials have been studied recently with increasing depth and breadth, for purposes of both using polymers in fabricating THz optical components such as lenses, waveplates, waveguides, and sample holders/containers, and employing THz spectral imaging as a new tool for nondestructive testing of polymer composite structures. Either endeavor cannot even begin without a quantitative knowledge of the complex dielectric permittivity, i.e., the propagation and attenuation properties of such polymers in the requisite wave band...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429681/microwave-diathermy-in-physiotherapy-units-a-survey-on-spatial-and-time-heterogeneity-of-electromagnetic-field
#3
Andreas Andrikopoulos, Adam Adamopoulos, Ioannis Seimenis, Constantinos Miltiadis Koutsojannis
Microwave diathermy (MWD) is a therapeutic system that is in use for some decades now in all physiotherapy settings, according to national facility establishment regulations. Diathermy devices probably lack validity, as working time passes, introducing the need of control/reset of the device by qualified personnel, in order to maintain its effectiveness in sessions and accurately deliver the energy output the physiotherapist asks for. However, while in the field of physical therapy MWD has been a vital part for practicing the profession of physiotherapist, there is not a clear evidence of health burden due to incorrect usability...
April 21, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28420124/applying-broadband-dielectric-spectroscopy-bds-for-the-biophysical-characterization-of-mammalian-tissues-under-a-variety-of-cellular-stresses
#4
Maria P Souli, Panagiotis Klonos, Adamantia F Fragopoulou, Ifigeneia V Mavragani, Ioannis S Pateras, Nikolaos Kostomitsopoulos, Lukas H Margaritis, Pavlos Zoumpoulis, Loukas Kaklamanis, Dimitris Kletsas, Vassilis G Gorgoulis, Apostolos Kyritsis, Polycarpos Pissis, Alexandros G Georgakilas
The dielectric properties of biological tissues can contribute non-invasively to a better characterization and understanding of the structural properties and physiology of living organisms. The question we asked, is whether these induced changes are effected by an endogenous or exogenous cellular stress, and can they be detected non-invasively in the form of a dielectric response, e.g., an AC conductivity switch in the broadband frequency spectrum. This study constitutes the first methodological approach for the detection of environmental stress-induced damage in mammalian tissues by the means of broadband dielectric spectroscopy (BDS) at the frequencies of 1-10⁶ Hz...
April 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28415331/transition-radiation-at-the-boundary-of-a-chiral-isotropic-medium
#5
Sergey N Galyamin, Andrey V Tyukhtin, Anton A Peshkov
This study analyzes the radiation produced by a point charge intersecting the interface between a vacuum and a chiral isotropic medium. We deduce analytical expressions for the Fourier components of an electromagnetic field in both vacuum and medium for arbitrary charge velocity. The main focus is on investigating the far field in a vacuum. The distinguishing feature of the interface with a chiral isotropic medium is that the field in the vacuum area contains both copolarization (coinciding with the polarization of the self-field of a charge) and cross-polarization (orthogonal to the polarization of the self-field)...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414399/current-understanding-of-the-health-effects-of-electromagnetic-fields
#6
Tayaba Miah, Deepak Kamat
There has been an exponential increase in the use of electronic devices over the past few decades. This has led to increased exposure to electromagnetic fields (EMF). Electric fields result from differences in voltage, whereas magnetic fields result from the flow of electric current. Higher-frequency waves of EMF have more energy than lower-frequency waves, and thus generally tend to be more harmful. An EMF activates cellular stress response and also causes breaks in DNA strands. There are many methodological barriers to effectively measuring the associations of EMF and childhood cancers...
April 1, 2017: Pediatric Annals
https://www.readbyqxmd.com/read/28401165/evaluation-of-mobile-phone-and-cordless-phone-use-and-glioma-risk-using-the-bradford-hill-viewpoints-from-1965-on-association-or-causation
#7
REVIEW
Michael Carlberg, Lennart Hardell
Objective. Bradford Hill's viewpoints from 1965 on association or causation were used on glioma risk and use of mobile or cordless phones. Methods. All nine viewpoints were evaluated based on epidemiology and laboratory studies. Results. Strength: meta-analysis of case-control studies gave odds ratio (OR) = 1.90, 95% confidence interval (CI) = 1.31-2.76 with highest cumulative exposure. Consistency: the risk increased with latency, meta-analysis gave in the 10+ years' latency group OR = 1.62, 95% CI = 1.20-2...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28396591/3d-field-shaping-lens-using-all-dielectric-gradient-refractive-index-materials
#8
Tongyu Ding, Jianjia Yi, Haoyu Li, Hailin Zhang, Shah Nawaz Burokur
A novel three-dimensional (3D) optical lens structure for electromagnetic field shaping based on spatial light transformation method is proposed at microwave frequencies. The lens is capable of transforming cylindrical wavefronts into planar ones, and generating a directive emission. Such manipulation is simulated and analysed by solving Laplace's equation, and the deformation of the medium during the transformation is theoretically described in detail. The two-dimensional (2D) design method producing quasi-isotropic parameters is further extended to a potential 3D realization with all-dielectric gradient refractive index metamaterials...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28388211/super-planckian-electron-cooling-in-a-van-der-waals-stack
#9
Alessandro Principi, Mark B Lundeberg, Niels C H Hesp, Klaas-Jan Tielrooij, Frank H L Koppens, Marco Polini
Radiative heat transfer (RHT) between macroscopic bodies at separations that are much smaller than the thermal wavelength is ruled by evanescent electromagnetic modes and can be orders of magnitude more efficient than its far-field counterpart, which is described by the Stefan-Boltzmann law. In this Letter, we present a microscopic theory of RHT in van der Waals stacks comprising graphene and a natural hyperbolic material, i.e., hexagonal boron nitride (hBN). We demonstrate that RHT between hot carriers in graphene and hyperbolic phonon polaritons in hBN is extremely efficient at room temperature, leading to picosecond time scales for the carrier cooling dynamics...
March 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28386909/remote-measurement-of-sunflower-seed-moisture-content-by-the-use-of-microwaves
#10
Vitali L Litvischenko, Igor Ya Nikiforov, Igor V Ershov
BACKGROUND: The modern agriculture demands new methods and equipment that allow operators to conduct the instant control of moisture content over a wide area of agricultural fields with the purpose of providing the farmers with the optimal moment of harvesting mature seeds and crops. The authors proposed a new method and experimentally investigated the possibility to accomplish remote sensing of moisture content of sunflower seeds by using a microwave radiation of a millimeter range. RESULTS: An experimental device for measuring the coefficient of reflection of electromagnetic waves from sunflower inflorescence in a frequency range of 25...
April 7, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28384421/beetle-exoskeleton-may-facilitate-body-heat-acting-differentially-across-the-electromagnetic-spectrum
#11
Luis M Carrascal, Yolanda Jiménez Ruiz, Jorge M Lobo
Exoskeletons of beetles and their associated morphological characteristics can serve many different functions, including thermoregulation. We study the thermal role of the exoskeleton in 13 Geotrupidae dung beetle species using heating experiments under controlled conditions. The main purpose was to measure the influence of heating sources (solar radiance vs. infrared), animal position (dorsal exposure vs. ventral exposure), species identity, and phylogenetic relationships on internal asymptotic temperatures and heating rates...
May 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28378967/effect-of-electromagnetic-waves-on-human-reproduction
#12
REVIEW
Artur Wdowiak, Paweł A Mazurek, Anita Wdowiak, Iwona Bojar
Electromagnetic radiation (EMR) emitting from the natural environment, as well as from the use of industrial and everyday appliances, constantly influence the human body. The effect of this type of energy on living tissues may exert various effects on their functioning, although the mechanisms conditioning this phenomenon have not been fully explained. It may be expected that the interactions between electromagnetic radiation and the living organism would depend on the amount and parameters of the transmitted energy and type of tissue exposed...
March 31, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28377202/ureteroscopy-assisted-percutaneous-kidney-access-made-easy-first-clinical-experience-with-a-novel-navigation-system-using-electromagnetic-guidance-ideal-stage-1
#13
Estevao Lima, Pedro L Rodrigues, Paulo Mota, Nuno Carvalho, Emanuel Dias, Jorge Correia-Pinto, Riccardo Autorino, João L Vilaça
BACKGROUND: Puncture of the renal collecting system represents a challenging step in percutaneous nephrolithotomy (PCNL). Limitations related to the use of standard fluoroscopic-based and ultrasound-based maneuvers have been recognized. OBJECTIVES: To describe the technique and early clinical outcomes of a novel navigation system for percutaneous kidney access. DESIGN, SETTING, AND PARTICIPANTS: This was a proof-of-concept study (IDEAL phase 1) conducted at a single academic center...
April 1, 2017: European Urology
https://www.readbyqxmd.com/read/28373721/toroidal-dipolar-excitation-in-metamaterials-consisting-of-metal-nanodisks-and-a-dielectrc-spacer-on-metal-substrate
#14
Chaojun Tang, Bo Yan, Qiugu Wang, Jing Chen, Zhendong Yan, Fanxin Liu, Naibo Chen, Chenghua Sui
We have investigated numerically toroidal dipolar excitation at optical frequency in metamaterials whose unit cell consists of three identical Ag nanodisks and a SiO2 spacer on Ag substrate. The near-field plasmon hybridization between individual Ag nanodisks and substrate forms three magnetic dipolar resonances, at normal incidence of plane electromagnetic waves. The strong coupling among three magnetic dipolar resonances leads to the toroidal dipolar excitation, when space-inversion symmetry is broke along the polarization direction of incident light...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28372445/novel-experimental-technique-for-3d-investigation-of-high-speed-cavitating-diesel-fuel-flows-by-x-ray-micro-computed-tomography
#15
M Lorenzi, N Mitroglou, M Santini, M Gavaises
An experimental technique for the estimation of the temporal-averaged vapour volume fraction within high-speed cavitating flow orifices is presented. The scientific instrument is designed to employ X-ray micro computed tomography (microCT) as a quantitative 3D measuring technique applied to custom designed, large-scale, orifice-type flow channels made from Polyether-ether-ketone (PEEK). The attenuation of the ionising electromagnetic radiation by the fluid under examination depends on its local density; the transmitted radiation through the cavitation volume is compared to the incident radiation, and combination of radiographies from sufficient number of angles leads to the reconstruction of attenuation coefficients versus the spatial position...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28371755/are-media-reports-able-to-cause-somatic-symptoms-attributed-to-wifi-radiation-an-experimental-test-of-the-negative-expectation-hypothesis
#16
Anne-Kathrin Bräscher, Koen Raymaekers, Omer Van den Bergh, Michael Witthöft
People suffering from idiopathic environmental intolerance attributed to electromagnetic fields (IEI-EMF) experience numerous non-specific symptoms that they attribute to EMF. The cause of this condition remains vague and evidence shows that psychological rather than bioelectromagnetic mechanisms are at work. We hypothesized a role of media reports in the etiology of IEI-EMF and investigated how somatosensory perception is affected. 65 healthy participants were instructed that EMF exposure can lead to enhanced somatosensory perception...
March 31, 2017: Environmental Research
https://www.readbyqxmd.com/read/28362571/transpyloric-feeding-tube-placement-using-electromagnetic-placement-device-in-children
#17
Margaret Goggans, Sharon Pickard, Alina Nico West, Samir Shah, Dai Kimura
BACKGROUND: Transpyloric feeding tubes (TPT) are often recommended in critically ill children. Blind tube placement, however, can be difficult, be time-consuming, and incur multiple radiation exposures. An electromagnetic device (EMD) is available for confirmation of successful placement of TPTs. We conducted a retrospective cohort study to evaluate the efficacy of an EMD for TPT placement in children and determine its impact on placement success, radiation exposure, confirmation time, and cost for tube placement compared with traditional blind TPT placement...
April 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28362392/fabrication-of-nanopillar-based-split-ring-resonators-for-displacement-current-mediated-resonances-in-terahertz-metamaterials
#18
Chao Liu, Joseph Schauff, Seokhyeong Lee, Jeong-Hyun Cho
Terahertz (THz) split ring resonator (SRR) metamaterials (MMs) has been studied for gas, chemical, and biomolecular sensing applications because the SRR is not affected by environmental characteristics such as the temperature and pressure surrounding the resonator. Electromagnetic radiation in THz frequencies is biocompatible, which is a critical condition especially for the application of the biomolecular sensing. However, the quality factor (Q-factor) and frequency responses of traditional thin-film based split ring resonator (SRR) MMs are very low, which limits their sensitivities and selectivity as sensors...
March 23, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28358824/l%C3%A3-vy-noise-improves-the-electrical-activity-in-a-neuron-under-electromagnetic-radiation
#19
Juan Wu, Yong Xu, Jun Ma
As the fluctuations of the internal bioelectricity of nervous system is various and complex, the external electromagnetic radiation induced by magnet flux on membrane can be described by the non-Gaussian type distribution of Lévy noise. Thus, the electrical activities in an improved Hindmarsh-Rose model excited by the external electromagnetic radiation of Lévy noise are investigated and some interesting modes of the electrical activities are exhibited. The external electromagnetic radiation of Lévy noise leads to the mode transition of the electrical activities and spatial phase, such as from the rest state to the firing state, from the spiking state to the spiking state with more spikes, and from the spiking state to the bursting state...
2017: PloS One
https://www.readbyqxmd.com/read/28351128/nanoparticles-of-titanium-and-zinc-oxides-as-novel-agents-in-tumor-treatment-a-review
#20
Janusz Bogdan, Joanna Pławińska-Czarnak, Joanna Zarzyńska
Cancer has become a global problem. On all continents, a great number of people are diagnosed with this disease. In spite of the progress in medical care, cancer still ends fatal for a great number of the ill, either as a result of a late diagnosis or due to inefficiency of therapies. The majority of the tumors are resistant to drugs. Thus, the search for new, more effective therapy methods continues. Recently, nanotechnology has been attributed with big expectations in respect of the cancer fight. That interdisciplinary field of science creates nanomaterials (NMs) and nanoparticles (NPs) that can be applied, e...
December 2017: Nanoscale Research Letters
keyword
keyword
45988
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"