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Showing results for: distance

Study and Analysis of 4G-5G Spectrum Mobile Signals on Germination Seed and Further Growth

Research RF Safe Research Library Dec 15, 2022

This study describes a planned and initial experiment assessing RF radiation from user devices in frequency bands common to 4G/5G communications on Butter Bean seed germination and subsequent growth. The setup considered uplink/downlink radiation patterns and exposure-related factors such as frequency and distance.…

Measuring the Electromagnetic Field of the Human Brain at a Distance Using a Shielded Electromagnetic Field Channel.

Research RF Safe Research Library Jan 1, 2022

This study describes a non-contact, non-invasive method to measure electromagnetic activity attributed to the human brain using a lightweight helmet and a shielded EMF channel around a sensor. Volunteers performed metronome-synchronized tasks intended to elicit movement, thoughts of movement, and emotional thought.…

Modelling and Evaluation of the Absorption of the 866 MHz Electromagnetic Field in Humans Exposed near to Fixed I-RFID Readers Used in Medical RTLS or to Monitor PPE.

Research RF Safe Research Library Jan 1, 2021

This study modelled SAR in humans near fixed multi-antenna UHF RFID readers operating at 866 MHz, representing RTLS and PPE-monitoring use scenarios. The modelling suggests that at 5 cm distance, SAR may warrant consideration against international exposure limits aimed at preventing thermal effects when effective…

Nonionizing Electromagnetic Field: A Promising Alternative for Growing Control Yeast.

Research RF Safe Research Library Jan 1, 2021

This laboratory study examined radiofrequency EMF exposure between 1 and 5.9 GHz as a method to control yeast growth relevant to food spoilage. The authors report reduced yeast viability at all tested frequencies and note that antenna-to-sample distance affected the outcome. Electron microscopy findings are described…

Evaluation of the safety of users of active implantable medical devices (AIMD) in the working environment in terms of exposure to electromagnetic fields - Practical approach to the requirements of European Directive 2013/35/EU.

Research RF Safe Research Library Jan 1, 2018

This study assessed electromagnetic field exposure near common strong EMF sources in medical and industrial workplaces to estimate standard safety distances (SSD) for workers using active implantable medical devices (AIMD). Using measurements near 127 devices, the longest SSDs were reported near dielectric sealers…

Effect of Electromagnetic Waves from Mobile Phones on Spermatogenesis in the Era of 4G-LTE.

Research RF Safe Research Library Jan 1, 2018

This animal experiment assessed whether long-duration 4G-LTE mobile phone electromagnetic field exposure affects spermatogenesis in male rats. After 1 month, the highest exposure condition (3 cm distance, 18 h/day) had reduced spermatid, spermatogonia, total germ cell, and Leydig cell counts compared with sham and…

The effects of microwave radiation on rabbit's retina.

Research RF Safe Research Library Jan 1, 2018

This experimental rabbit study evaluated retinal effects of GSM cell phone simulator microwave irradiation at different distances and durations. ERG outcomes 7 days after exposure showed no statistically significant differences between groups, although irradiated eyes showed non-significant trends toward greater…

Demonstration of long-distance hazard-free wearable EEG monitoring system using mobile phone visible light communication.

Research RF Safe Research Library Jan 1, 2017

This paper describes an engineering approach to avoid RF/microwave radiation in wearable EEG data transmission by using visible light communication. The system performance was tested at different illuminance levels and an algorithm for low-illuminance operation was proposed. The authors report error-free transmission…

The effect of inter-electrode distance on the electric field distribution during transcutaneous lumbar spinal cord direct current stimulation.

Research RF Safe Research Library Jan 1, 2016

This engineering-focused study examined how inter-electrode distance in transcutaneous spinal direct current stimulation (tsDCS) affects electric field distribution in the lumbar and sacral spinal cord. Peak E-field magnitudes occurred in the lumbo-sacral region for all configurations. Larger electrode separations…

Near-field radiofrequency electromagnetic exposure assessment

Research RF Safe Research Library Jan 1, 2015

This paper presents a near-field RF exposure assessment method comparing standard SAR estimation from E-field measurements in tissue-simulating liquid with a proposed approach based on incident H-field measurements. Experiments were conducted at 900, 1800, and 2450 MHz using dipole antennas and a flat phantom, with…

Distance from residence to power line and risk of childhood leukemia: a population-based case-control study in Denmark

Research RF Safe Research Library Jan 1, 2014

This population-based case-control study in Denmark examined whether distance from residence at birth to high-voltage overhead power lines was associated with childhood leukemia. Using GIS-based distance measures, the study did not find higher leukemia risk for children living within 0–199 m or 200–599 m of 132–400…

Extremely low-frequency magnetic fields of transformers and possible biological and health effects

Research RF Safe Research Library Jan 1, 2014

This study measured leakage extremely low-frequency (ELF) magnetic fields around a transformer located on the bottom floor of a three-floor apartment building in Istanbul. The measurements were evaluated against international exposure standards, and the authors report exposures higher than the IARC threshold magnetic…

Wireless Communication of Intraoral Devices and Its Optimal Frequency Selection.

Research RF Safe Research Library Jan 1, 2014

This engineering study assesses optimal RF frequencies for wireless communication with intraoral electronic devices using an intraoral tongue drive system as an example. It compares 27 MHz, 433.9 MHz, and 2.48 GHz based on path loss, radiation patterns, and bit error rate tests, with adaptive impedance matching…

Extremely Low Frequency Electromagnetic Field from Convective Air Warming System on Temperature Selection and Distance.

Research RF Safe Research Library Jan 1, 2014

This study measured extremely low frequency electromagnetic field (ELF-EMF) emitted by a convective air warming (forced air warmer) device at different temperature settings and distances. Reported ELF-EMF levels increased with closer proximity and higher temperature settings, with mean values around 18 mG at 30 cm.…

Investigating short-term exposure to electromagnetic fields on reproductive capacity of invertebrates in the field situation.

Research RF Safe Research Library Jan 1, 2014

This field experiment examined short-term (48-hour) exposure to RF EMF from a GSM 900 MHz mobile phone base station on reproductive endpoints in four invertebrate species. The study reports no significant effects of exposure metrics on fecundity or number of offspring, and notes that distance was not a suitable proxy…

Exposure Knowledge and Risk Perception of RF EMF.

Research RF Safe Research Library Jan 1, 2014

This cross-sectional survey study (LEXNET project) examined how subjective exposure knowledge relates to risk perception (RP) for different RF EMF sources. Respondents were more concerned about base stations than other sources. Regression results suggested that most exposure-characteristic features (except distance)…

[Objectivized evaluation of surgeons exposure to radiofrequency electromagnetic fields -- in the context of exposure duration and Polish and new international requirements regarding workers protection].

Research RF Safe Research Library Jan 1, 2013

This occupational exposure assessment monitored surgeons during 11 surgeries using monopolar electro surgery units and measured electric and magnetic field strengths during cutting and coagulating modes. Electric fields near the cable at 10 cm were reported in the hundreds of V/m, while magnetic fields were

[Study on dewatering of activated sludge under applied electric field].

Research RF Safe Research Library Jan 1, 2012

This engineering study investigated factors affecting electro-dewatering of activated sludge under a horizontal applied electric field. It reports optimal performance without altering sludge pH or conductivity and finds that CPAM conditioning improves and accelerates dewatering. The authors provide operating…

Application of an induced field sensor for assessment of electromagnetic exposure from compact fluorescent lamps.

Research RF Safe Research Library Jan 1, 2012

This study investigates instrumentation and procedures to assess electromagnetic exposure from compact fluorescent lamps (CFLs) by measuring both incident and induced fields in the 10 kHz–1 MHz range. For some CFLs, incident electric fields exceeded ICNIRP reference levels at close distances, but induced fields were…

Localizing Broca's area for transcranial magnetic stimulation: Comparison of surface distance measurements and stereotaxic positioning.

Research RF Safe Research Library Jan 1, 2009

This methods study evaluated an MRI-based surface distance measurements (SDM) approach for localizing Broca's area for TMS coil placement without external tracking devices. Coil positioning using SDM was compared with an advanced frameless stereotaxic navigation system. The reported mean difference between methods…

Are people living next to mobile phone base stations more strained? Relationship of health concerns, self-estimated distance to base station, and psychological parameters.

Research RF Safe Research Library Jan 1, 2009

This cross-sectional study surveyed 57 participants about perceived proximity to mobile phone base stations, EMF-related concerns, and psychological strain, and also collected saliva biomarkers. Self-declared base station neighbors (≤100 m) showed higher salivary alpha-amylase and higher symptom checklist scores on…

Ising spin-glass transition in a magnetic field outside the limit of validity of mean-field theory.

Research RF Safe Research Library Jan 1, 2009

This paper studies the spin-glass transition in a magnetic field using a diluted one-dimensional long-range Ising model with distance-dependent bond probability. The authors report evidence for a spin-glass transition in a magnetic field both within and beyond the mean-field regime. They also report such evidence for…

Static magnetic field therapy: a critical review of treatment parameters.

Research RF Safe Research Library Jan 1, 2009

This critical review summarizes human research on static magnetic field (SMF) therapy delivered by permanent magnets attached to the skin and evaluates how well studies report SMF dosage and treatment parameters. Across 56 included studies, many did not report essential SMF characteristics (e.g., magnet dimensions,…

[Determination of electric field distribution in dielectric barrier surface glow discharge by spectroscopic method].

Research RF Safe Research Library Jan 1, 2008

This engineering study reports spectroscopic determination of net electric field distribution in a dielectric barrier surface glow discharge in low-pressure air. Optical emission spectroscopy was used to infer electric field distribution from the intensity ratio of nitrogen spectral lines at 391.4 nm and 337.1 nm.…

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