نتایج جستجو برای: electromagnetic fields

تعداد نتایج: 307264  

ژورنال: ارگونومی 2015
عزیزی, مهتاب, علی‌آبادی, محسن , گلمحمدی, رستم,

Introduction: In recent years, compact fluorescent lamps have been more widely used across the country as a means of optimizing energy consumption. Given the health consequences of lighting sources, the present study was conducted to investigate the intensity of electromagnetic fields emitted by common compact fluorescent lamps. Materials and Methods: The study examined 54 compact fluo...

2006
Vasily E. Tarasov

Fractals are measurable metric sets with non-integer Hausdorff dimensions. If electric and magnetic fields are defined on fractal and do not exist outside of fractal in Euclidean space, then we can use the fractional generalization of the integral Maxwell equations. The fractional integrals are considered as approximations of integrals on fractals. We prove that fractal can be described as a sp...

Journal: :International journal of occupational safety and ergonomics : JOSE 2006
Monica Sandström

With the increased use of electric and electronic equipment in our offices, our daily exposure to electromagnetic fields has become increasingly complex due to the great variety of the frequency content of the fields. Today focus has shifted from monitors as the dominating sources of electromagnetic fields to other electronic equipment, cabling, nearby substations, power lines and stray current...

Journal: :Journal of cellular biochemistry 1993
R Goodman Y Chizmadzhev A Shirley-Henderson

There is strong public interest in the possibility of health effects associated with exposure to extremely low frequency (elf) electromagnetic (EM) fields. Epidemiological studies suggest a probable, but controversial, link between exposure to elf EM fields and increased incidence of some cancers in both children and adults. There are hundreds of scientific studies that have tested the effects ...

Journal: :journal of biomedical physics and engineering 0
gh mortazavi dentist, pahlavankoshi health center, ahram health network, busher university of medical sciences, bushehr, iran m haghani ionizing and non-ionizing radiation protection research center (inirprc), shiraz university of medical sciences, shiraz, iran n rastegarian speech pathology student, student research committee, school of rehabilitation, shiraz university of medical sciences, sسازمان اصلی تایید شده: دانشگاه علوم پزشکی شیراز (shiraz university of medical sciences) s zarei speech pathology student, student research committee, school of rehabilitation, shiraz university of medical sciences, shiraz, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی شیراز (shiraz university of medical sciences) smj mortazavi 2. ionizing and non-ionizing radiation protection research center (inirprc), shiraz university of medical sciences, shiraz, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی شیراز (shiraz university of medical sciences)

normal 0 false false false en-us x-none ar-sa according to the world health organization (who), factors such as growing electricity demand, ever-advancing technologies and changes in social behaviour have led to steadily increasing exposure to man-made electromagnetic fields.   dental amalgam fillings are among the major sources of exposure to elemental mercury vapour in the general population....

2007
B. D. Sherwin

The magnetic fields and energy flows in an astronomical jet described by our earlier model are calculated in detail. Though the field distribution varies with the external pressure function p(z), it depends only weakly on the other boundary conditions. Individual fieldlines were plotted; the lines become nearly vertical at the bottom and are twisted at the top. An animation of a fieldline’s mot...

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 2006
Henk F Arnoldus

Scattering of electromagnetic radiation by an object of arbitrary shape or a structured surface, infinite in extent, is considered. When radiation is incident on an interface separating vacuum from a material medium, a current density is induced in the bulk and a surface current density may appear on the boundary surface. The electromagnetic field is then the sum of the incident field and the f...

2010
Stephen M. Barnett

The association of spin and orbital angular momenta of light with its polarization and helical phase fronts is now well established. The problems in linking this with electromagnetic theory, as expressed in Maxwell's equations, are rather less well known. We present a simple analysis of the problems involved in defining spin and orbital angular momenta for electromagnetic fields and discuss som...

Journal: :فیزیک زمین و فضا 0
محمدجواد کلایی موسسه ژئوفیزیک دانشگاه تهران امین اسماعیلی پسا دکتری

one of the most important advantages of particle simulation as compared to fluid simulation is the capacity for working with and tracing particles. in particle simulations, the test particle method is usually used to get some idea of the behavior of plasma or other substances. in this method, first, a small number of particles are injected into the frame of static electromagnetic fields. then, ...

Journal: :journal of biomedical physics and engineering 0
gh mortazavi s a r mortazavi a r mehdizadeh

a large body of evidence now indicates that the amount of mercury released from dental amalgam fillings can be significantly accelerated by exposure to radiofrequency electromagnetic fields (rf-emfs) such as common mobile phones and magnetic resonance imaging (mri). studies performed on the increased microleakage of dental amalgam restorations after exposure to rf-emfs have further supported th...

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