نتایج جستجو برای: radio frequency electromagnetic fields rf

تعداد نتایج: 841680  

2005
L. K. Bandyopadhyay P. K. Mishra Sudhir Kumar

Due to the high attenuation of radio frequency (RF) signals in underground mines and the statutory power restriction of communication gadgets especially for coal mines, the wireless communication systems have restricted applications in the underground mines. The paper discusses different radio frequency communication techniques being employed for Indian underground mines. Experiments were condu...

2016
A. Masiello G. Mella P. Sonato C. Taccon

Modified conducting structures of the RFX machine have been designed to intentionally reduce electrical discontinuities, thus error fields due to eddy currents have been substantially reduced also. For this reason, for example, the stabilizing shell features a single poloidal and a single equatorial gap. Electrical insulations of those gaps shall be verified before and during the assembly phase...

Journal: :journal of biomedical physics and engineering 0
smj mortazavi s rahimi a talebi a soleimani a rafati

introduction : the  rapid development  of wireless telecommunication technologies  over the past decades, has led to significant changes in the exposure of the general public to electromagnetic fi elds. nowadays, people are continuously exposed to different sources of electromagnetic fi elds such as mobile phones, mobile base stations, cordless phones, wi-fi routers, and power lines. therefore,...

Journal: :Bioelectromagnetics 2009
Ki Chang Nam Ju Hyung Lee Hyung Wook Noh Eun Jong Cha Nam Hyun Kim Deok Won Kim

With the number of cellular phone users rapidly increasing, there is a considerable amount of public concern regarding the effects that electromagnetic fields (EMFs) from cellular phones have on health. People with self-attributed electromagnetic hypersensitivity (EHS) complain of subjective symptoms such as headaches, insomnia, and memory loss, and attribute these symptoms to radio frequency (...

Journal: :journal of biomedical physics and engineering 0
m eghlidospour smj mortazavi f yousefi sar mortazavi

mobile phone use and wireless communication technology have grown explosively over the past decades. this rapid growth has caused widespread global concern about the potential detrimental effects of this technology on human health. stem cells generate specialized cell types of the tissue in which they reside through normal differentiation pathways. considering the undeniable importance of stem ...

دهقانی, جعفر, رحیقی, جواد, سرحدی, خورشید, مرادی, وحید, پیرانی, سعید, کامکاری, بابک,

Iranian Light Source Facility (ILSF) RF system was conceptually designed based on ILSF requirements for a 3 GeV storage ring and 400 mA beam current at 500 MHz RF frequency. Considering the fact that  cavity construction is simpler at 100 MHz and advantages of reducing frequency provided an alternative of 100MHz RF system to be explored for ILSF. After a thorough study on the effect of reducing...

Journal: :International Journal of Environmental Research and Public Health 2018

Introduction: Electrochemotherapy (ECT) is a cancer treatment modality to permeabilize cell membrane facilitating the non-permeant molecules to gain access to the cytosol of cells. Nevertheless, environmental electromagnetic fields (EMFs) may disturb the efficiency of ECT. The present study aimed to investigate the effect of EMFs 900 MHz pulse-modulated by 217 Hz extremely low-frequency fields ...

Farhud, Dryoush, Pourkalhor, Hanieh,

In recent years, male fertility has changed due to the effects of environmental, health and lifestyle factors and the infertility rate has increased, to the extent that male fertility may be affected by extreme heat, exposure to pesticides, radiation, substances Changes in radioactivity, lifestyle, stress and occupation. In the environment, there are ionizing and non-ionizing rays whose effect...

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