scholarly journals Long-Term Monitoring of Extremely Low Frequency Magnetic Fields in Electric Vehicles

2019 ◽  
Vol 16 (19) ◽  
pp. 3765 ◽  
Author(s):  
Yang ◽  
Lu ◽  
Lin ◽  
Li ◽  
Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electric Vehicles ◽  
Low Frequency ◽  
Epidemiological Studies ◽  
Magnetic Flux Density ◽  
Extremely Low Frequency ◽  
Long Term Monitoring ◽  
The Magnetic Field ◽  
Term Monitoring

Extremely low frequency (ELF) magnetic field (MF) exposure in electric vehicles (EVs) has raised public concern for human health. There have been many studies evaluating magnetic field values in these vehicles. However, there has been no report on the temporal variation of the magnetic field in the cabin . This is the first study on the long-term monitoring of actual MFs in EVs. In the study, we measured the magnetic flux density (B) in three shared vehicles over a period of two years. The measurements were performed at the front and rear seats during acceleration and constant-speed driving modes. We found that the B amplitudes and the spectral components could be modified by replacing the components and the hubs, while regular checks or maintenance did not influence the B values in the vehicle. This observation highlights the necessity of regularly monitoring ELF MF in EVs, especially after major repairs or accidents, to protect car users from potentially excessive ELF MF exposure. These results should be considered in updates of the measurement standards. The ELF MF effect should also be taken into consideration in relevant epidemiological studies.

Long-term stellar magnetic field study at the Crimean Astrophysical Observatory

2018 ◽  
Vol 13 (S340) ◽  
pp. 35-38
Author(s):  
Varvara Butkovskaya ◽  
Sergei Plachinda ◽  
Dilyara Baklanova
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Study ◽  
Crimean Astrophysical Observatory ◽  
Activity Cycles ◽  
Magnetic Cycles ◽  
Long Term Monitoring ◽  
The Magnetic Field ◽  
Term Monitoring

AbstractThe long-term monitoring of magnetic cycles is a key diagnostic in understanding how dynamo generation and amplification of magnetic fields occur in solar-like stars. One of the current key problems is the establishment of the magnetic field behavior during the activity cycles for stars of different ages and evolutionary statuses. We present the experience of using own long-term datasets for study of activity cycles in selected stars at the Crimean Astrophysical Observatory.

Exposure of adults to extremely low frequency magnetic field in France: results of the EXPERS study

2019 ◽  
Vol 55 (1) ◽  
pp. 39-50 ◽  
Author(s):  
I. Magne ◽  
M. Souques ◽  
L. Courouve ◽  
A. Duburcq ◽  
E. Remy ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Personal Exposure ◽  
Epidemiological Studies ◽  
Field Exposure ◽  
Extremely Low Frequency ◽  
Measurement Protocol ◽  
Main Variable ◽  
Frequency Magnetic Field ◽  
The Magnetic Field

Assessing the exposure of adults to magnetic field is a central point in the context of epidemiological studies. The EXPERS study is the first study at national scale in Europe with measurements of personal exposure to extremely low frequency magnetic fields, involving 1046 French adults with 24 h personal measurements. The proportion of adults with a 24 h AM of ≥ 1 µT was 2.1% for all adults and 0.3% for adults for which no alarm clock was identified, as this requirement of the measurement protocol was sometimes not respected. The alarm clocks were the main variable linked to the adults’ exposure measurements. The vicinity of the home to a high voltage power line increased the magnetic field exposure. However, only 1.7% of the adults were living close to a 63 to 400 kV overhead line, and only one of them had a personal exposure ≥ 1 μT with an AM of 1.1 μT. The exposure of adults was also correlated with some characteristics of the home and its environment, and some durations of activities, such as the duration of work and the duration in rail transport. The distribution of adults’ personal exposure was significantly different from the distribution of exposure during sleep, and from the distribution of exposure assessed from measurements during sleep and work. This highlights the complexity of the exposure assessment in epidemiological studies.

scholarly journals Self-Organizing Map Classification of the Extremely Low-Frequency Magnetic Field Produced by Typical Tablet Computers

2018 ◽  
Vol 18 (3) ◽  
pp. 94-99
Author(s):  
Darko Brodić ◽  
Alessia Amelio ◽  
Ivo R. Draganov
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Self Organizing Map ◽  
Tablet Computers ◽  
High Exposure ◽  
Extremely Low Frequency ◽  
Frequency Magnetic Field ◽  
The Magnetic Field ◽  
Self Organizing

Abstract In this paper, the extremely low frequency magnetic field produced by the tablet computers is explored. The measurement of the tablet computers’ magnetic field is performed by using a measuring geometry previously proposed for the laptop computers. The experiment is conducted on five Android tablet computers. The measured values of the magnetic field are compared to the widely accepted TCO safety standard. Then, the results are classified by the Self-Organizing Map method in order to create different levels of safety or danger concerning the magnetic field to which tablet computer users are exposed. Furthermore, a brief comparison of the obtained magnetic field levels with the ones from typical laptops is performed. At the end, a practical suggestion on how to avoid the high exposure to the low frequency magnetic field emitted by the tablet computers is given.

scholarly journals Analysis of the Extremely Low Frequency Magnetic Field Emission from Laptop Computers

2016 ◽  
Vol 23 (1) ◽  
pp. 143-154 ◽  
Author(s):  
Darko Brodić
Keyword(s):  
Magnetic Field ◽  
Field Emission ◽  
Close Contact ◽  
Low Frequency ◽  
Laptop Computers ◽  
Extremely Low Frequency ◽  
Frequency Magnetic Field ◽  
High Emission ◽  
The Magnetic Field ◽  
Specific Experiment

Abstract This study addresses the problem of magnetic field emission produced by the laptop computers. Although, the magnetic field is spread over the entire frequency spectrum, the most dangerous part of it to the laptop users is the frequency range from 50 to 500 Hz, commonly called the extremely low frequency magnetic field. In this frequency region the magnetic field is characterized by high peak values. To examine the influence of laptop’s magnetic field emission in the office, a specific experiment is proposed. It includes the measurement of the magnetic field at six laptop’s positions, which are in close contact to its user. The results obtained from ten different laptop computers show the extremely high emission at some positions, which are dependent on the power dissipation or bad ergonomics. Eventually, the experiment extracts these dangerous positions of magnetic field emission and suggests possible solutions.

The Effect of Long-Term Extremely Low-Frequency Magnetic Field on Geometric and Biomechanical Properties of Rats' Bone

2010 ◽  
Vol 29 (1-12) ◽  
pp. 9-18 ◽  
Author(s):  
M. Zulkuf Akdag ◽  
Suleyman Dasdag ◽  
Nurten Erdal ◽  
Huseyin Buyukbayram ◽  
Serkan Gurgul
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Biomechanical Properties ◽  
Extremely Low Frequency ◽  
Frequency Magnetic Field
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