نتایج جستجو برای: magnetic device

تعداد نتایج: 989267  

Journal: :international journal of occupational hygiene 0
mohammad reza monazzam esmail pour department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran hamed jalilian department of occupational health engineering, school of public health, iran university of medical sciences, tehran, iran kamran najafi department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran seyed abolfazl zakerian department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran

original article   one type of electromagnetic fields, based on frequency range, is extremely low frequency (elf) fields. there are lots of reports about measuring elf-magnetic field (mf) in substations, power plants, cities and etc. this study aimed to compare the difference between measurement of three-axis and single-axis probe mf meters. elf-mf was measured by tes-1394 mf tester (three-axis...

Journal: :international journal of occupational hygiene 0
mohammad reza monazzam esmail pour hamed jalilian kamran najafi seyed abolfazl zakerian

original article background and objectives: one type of electromagnetic fields, based on frequency range, is extremely low frequency (elf) fields. there are lots of reports about measuring elf- magnetic field (mf) in substations, power plants, cities, near high voltage power lines and etc. this study aimed to compare the difference between measurement of three-axis and single-axis probe mf mete...

In this paper, the noise equivalent power (NEP) of an optical sensor based ongraphene-superconductor junctions in the constant current mode of operation has beencalculated. Furthermore, the necessary investigations to optimize the device noise withrespect to various parameters such as the operating temperature, magnetic field, deviceresistance, voltage and current bias have been presented. By s...

ژورنال: سنجش و ایمنی پرتو 2018

In the extremely low frequency range (3 to 300 Hz), the intensities of electric and magnetic fields increase with increasing voltage and current. If the intensities of electric and magnetic fields are high compared with standard exposure limits, they can have harmful effects on human health. In the vicinity of power lines and high voltage power stations, the intensities of these fields are usua...

صمدی, محمد تقی, فراستی, فرهاد, پورمحمدی, علی,

Introduction & Objective: The use of computers and monitors (displays) has been developed due to their increasing capabilities. The presence of electromagnetic fields, infrared and ul-traviolet radiations has been proven around the display, which all of them have adverse ef-fects on human health. Therefore, this study was conducted to survey and compare the mentioned variables around the disp...

Journal: :British medical journal 1977
J Alexander-Williams A H Amery H B Devlin J C Goligher R J Heald A G Parks N Porter J P Thomson I P Todd

For patients, the principal drawback of a colostomy is the loss of faecal continence. To achieve a continent colostomy has long been the goal of surgeons. A magnetic stoma seal became feasible when a strong, light, durable magnet made of samarium-cobalt became commercially available in 1972. This metal compound has the highest magnetic energy per unit volume and loses only a few per cent of its...

Journal: :archives of trauma research 0
lukas l. negrin department of trauma surgery, medical university of vienna, vienna, austria; department of trauma surgery, medical university of vienna, vienna, austria. tel: +43-1404005901, fax: +43-1404005939 vilmos vécsei department of trauma surgery, medical university of vienna, vienna, austria

conclusions due to our satisfactory test results, the brief training, the steep learning curve and the radiation-free technique the new device has to be considered an appealing alternative for distal locking. objectives our cadaver study was performed to evaluate the accuracy and efficiency of this device. materials and methods in two runs, 30 probands (group 1: 10 students; group 2: 10 residen...

حافظی, فاطمه, زواریان, علی اصغر, سلحشور, مصطفی,

In this paper, the vacuum film deposition through electron beam evaporation has been reviewed and the effect of magnetic field on the operation of this system has been explained. Then, the magnetic field distribution due to magnetic components configuartion of a commercial evaporation source with 270-degree electron beam gun (manufactured by Sharif University Branch of ACECR), has been simulate...

N-Propylsulfamic acid supported onto magnetic Fe3O4 nanoparticles (MNPs-PSA) was investigated as an efficient and magnetically recoverable catalyst for the one-pot synthesis of substituted coumarins from the reaction of coumarin with variety aromatic aldehydes in high to excellent yield at room temperature under solvent-free conditions. The magnetic nanocatalyst can be readily recovered easily ...

A Andisheh-Tadbir A Haghnegahdar A Zamani, Gh Mortazavi, H Khosrovpanah H Parsaei, M Haghani M Saeedi Moghadam M Shojaei Fard O Koohi SMJ Mortazavi,

Background: Effects of electromagnetic fields on healing have been investigated for centuries. Substantial data indicates that exposure to electromagnetic field can lead to enhanced healing in both soft and hard tissues. Helmholtz coil is a device that generates pulsed electromagnetic fields. Objective: In this study, a pair of Helmholtz coils for enhancing thehealing process in periodontitis w...

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