نتایج جستجو برای: magnetic flux density

تعداد نتایج: 796844  

ززولی, محمدعلی, صارم صفاری, عادله, محمدیان, محمود, مهاجر دارابی, مصطفی, موسوی نسب, سید نورالدین,

Background and purpose: Considerable increase on the use of electronic devices increased the rate of public occupational exposure to extremely low frequency electromagnetic fields. Assessment of exposure to these fields is highly important due to potential health hazards. This study aimed at investigating the magnetic flux emission from extremely low frequency electromagnetic fields around powe...

حسین زاده, فاطمه , ززولی, محمدعلی, منظم, محمدرضا, یزدانی چراتی, جمشید,

Introduction: The power transmission lines are the emission source of extremely low frequency (ELF) electromagnetic fields that are considered to have an adverse impact on human health. Therefore the aim of this study was to evaluate the amount of magnetic flux with extremely low frequencies (ELF) around high voltage power transmission lines in the western areas of Tehran in 2012. Material a...

Magnetic abrasive finishing can be classified as a non-traditional super finishing method for finishing surfaces with different shapes and working materials like flat plates, shafts, bearings parts, screws, tubes and many other mechanical parts that need good surface finishing properties. MAF is effective in polishing, cleaning, deburring and burnishing metal parts. The most important parameter...

ژورنال: سلامت کار ایران 2015
امکانی, مجتبی, جلیلیان, حامد, حدادی, محسن, ذاکریان, سید ابوالفضل, منظم, محمد رضا, نجفی, کامران ,

Background and aims: Extremely low frequency magnetic field (ELF) is part of Spectrum of electromagnetic waves with range 30 to 300 Hz. The average magnetic field exposures in the workplace have been found to be higher in “electrical occupations” than in other occupations such as office work. The interaction between magnetic fields produced by power lines and substations with living organisms a...

Journal: :international journal of environmental research 0
p. nassiri occ. hyg. dept., school of public health, tehran university of medical sciences, tehran, iran m.r. monazzam department of environmental health engineering, school of public health, tehran university of medical sciences, tehran, iran m. yunesian department of environmental health engineering, school of public health, tehran university of medical sciences, tehran, iran, center for environmental research, school of public health, tehran university of medical sciences, tehran, iran m.h. sowlat department of environmental health engineering, school of public health, tehran university of medical sciences, tehran, iran m.h. safari islamic azad university, science and research branch, tehran, iran s. momen bellah fard department of environmental science, graduate school of the environment and energy, science and research branch, islamic azad university, tehran, iran s.a. hosseini

the ever increasing rate of power consumption has led to an increase in public exposure to extremely low frequency magnetic fields (elf-mfs) and brought severe concerns about their health effects. considering previous studies and the facts about potential health effects of these fields, the present study aimed to evaluate the elf-mf flux densities from power distribution lines near hospitals in...

In this research, the effect of addition of silicon carbide (SiC) nanoparticles on the improvement of the structural, superconductivity, magnetic, and flux pinning properties of high-temperature superconductor Bi1.6Pb0.4Sr2Ca2Cu3O10+θ (Bi-2223) was investigated. The Bi-2223 ceramic superconductor was prepared using the sol-gel method, and silicon carbide nanoparticles were modified by Azobisiso...

2016
Seong-Jae Lee David C. Jiles Vitalij K. Pecharsky

A permanent magnet structure for maximizing the flux density per weight of magnetic material comprising a hollow body flux source for generating a magnetic field in the central gap of the hollow body, the magnetic field having a flux density greater than the residual flux density of the hollow body flux source. The hollow body flux source has a generally elliptic-shape, defined by unequal major...

Journal: :international journal of environmental research 2011
p. nassiri m.r. monazzam m. yunesian m.h. sowlat m.h. safari

the ever increasing rate of power consumption has led to an increase in public exposure to extremely low frequency magnetic fields (elf-mfs) and brought severe concerns about their health effects. considering previous studies and the facts about potential health effects of these fields, the present study aimed to evaluate the elf-mf flux densities from power distribution lines near hospitals i...

2002
B. Murat Eyüboğlu Ravinder Reddy John S. Leigh

In this study, images of nonuniform and uniform electric current density in conductor phantoms, which contain magnetic resonance active nuclei, are produced using Magnetic Resonance Imaging (MRI). A standard spin echo pulse sequence is used, with the addition of a bipolar current pulse. The flux density parallel to the main magnetic field, generated by the current pulse, is encoded in the phase...

Recently, tape wound cores due to their excellent magnetic properties, are widely used in different types of transformers. Performance prediction of these transformers needs an accurate model with ability to determine flux distribution within the core and magnetic loss. Spiral structure of tape wound cores affects the flux distribution and always cause complication of analysis. In this paper, a...

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