نتایج جستجو برای: radio frequency electromagnetic fields rf

تعداد نتایج: 841680  

2014
Omar Raoof Hamed Al-Raweshidy

One of the main reasons behind the concurrent increase in the demand for and congestion of Radio Frequency (RF) spectrum is the rapid development of radio networks of all kinds in our world, which has defiantly changed the public feeling about radio. Nowadays, almost everybody has a mobile phone and radio stations are literary everywhere. Someone can argue that our world is becoming a radio wor...

برزگری فیروز ابادی, فاطمه, میرحسینی, محبوبه,

Introduction: Access to modern methods for increasing the percentage of in vitro human and animal mature oocytes can be useful in the treatment of some forms of human infertility as well as proliferation of many domestic and wild animals which generation is endangered. Effect of low- frequency electromagnetic fields on in vitro growth and maturation of mouse oocytes is recently considered as a ...

Journal: :Frontiers in communications and networks 2021

The development and establishment of mobile communication technologies has necessitated assessments possible risks to human health from exposures radio-frequency electromagnetic fields (RF EMF). A number expert committees have concluded that there is no evidence for such as long are at or below levels do not allow tissue heating. These been based primarily on studies investigating frequencies u...

Journal: :Annali dell'Istituto superiore di sanita 2007
Federica Censi Giovanni Calcagnini Michele Triventi Eugenio Mattei Pietro Bartolini

In this study we analyzed the problem of electromagnetic interference (EMI) between mobile telephones and cardiac pacemakers (PM), by looking at the mechanisms by which the radiated radio frequency (RF) GSM signal may affect the pacemaker function. From a literature review on this topic, we noticed that older pacemakers had a higher rate of being affected by mobile phones when compared to newer...

2016
Kang-Wei Lin Chuan-Jun Yang Hui-Yong Lian Peng Cai

In this study, we investigated the transcriptional response to 50 Hz extremely low frequency electromagnetic field (ELF-EMF) and 2.0 GHz radio frequency electromagnetic field (RF-EMF) exposure by Illumina sequencing technology using budding yeast as the model organism. The transcription levels of 28 genes were upregulated and those of four genes were downregulated under ELF-EMF exposure, while ...

1999
Alan J. Fenn Vythialingam Sathiaseelan Gerald A. King Paul R. Stauffer

■ Elevated cell tissue temperature (hyperthermia) due to radio-frequency (RF) energy absorption is known to produce an improved response for malignant tumors in humans when applied in combination with other anticancer modalities. However, clinical studies in thermotherapy have shown the difficulty of localizing RF energy deposition in malignant tissue deep within the body without damaging surro...

2009
John L. Bean

The Naval Surface Warfare Center, Dahlgren Division (NSWCDD), is the lead technical activity in an effort to develop electric primers which are insensitive to radio frequency (RF) energy. The program is specifically directed at solving the Navy's worst Hazards of Electromagnetic Radiation to Ordnance (HERO) problem, 20 mm ammunition used with the PHALANX Close-In Weapon System (CIWS). The techn...

2016
Daimeng Zhang Steven M. Anlage Thomas Antonsen Jeremy Munday

Title of dissertation: RADIO FREQUENCY SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE META-ATOMS AND METAMATERIALS: EXPERIMENT, THEORY AND ANALYSIS Daimeng Zhang, Doctor of Philosophy, 2016 Department of Electrical and Computer Engineering Dissertation directed by: Professor Steven M. Anlage Department of Physics Metamamterials are 1D, 2D or 3D arrays of artificial atoms. The artificial atoms, cal...

2008
Yatsenko E. Yatsenko

1. Introduction The studies of linear antenna in anisotropic mediums are important in such applications as radio communication in space, heating of plasma by high-frequency electromagnetic fields, diagnostics of magnetoactive plasma, electromagnetic compatibility of electronic devices, etc. The purpose of the present work is the solution of the problem on excitation of a system of thin impedanc...

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