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- Hamnerius, Yngve, 1950
(författare)
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Assessment of Radio Frequency Exposure from WLAN
- 2005
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Ingår i: XXVIIIth General Assembly of International Union Radio Science (URSI) Proceedings, New Dehli, India, Oct 23-29, 2005. ; :KAE.3(01302).pdf, s. 4-
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Konferensbidrag (refereegranskat)
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- Hamnerius, Yngve, 1950, et al.
(författare)
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Exposure from mobile phone systems in large crowds
- 2007
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Ingår i: Abstract BEMS 2007, BioElectromagnetics Society Annual meeting, Kanazawa, Japan, June 2007.. ; , s. 101-103
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Konferensbidrag (refereegranskat)
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- Johansson, Markus, 1978, et al.
(författare)
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Work exposure to electromagnetic fields
- 2009
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Ingår i: Electromagnetics in Advanced Applications, 2009. ICEAA '09. International Conference on. - 9781424433865 ; , s. 548-551
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Konferensbidrag (refereegranskat)abstract
- In order to investigate whether safety guidelines for workers exposure to electromagnetic fields are complied with, it is important to be able to model the field distribution. A method of determining the phase of the field, when only field amplitudes have been measured on a set of planes in the near field of an electromagnetic source, have been tested with good result, for a test case with measured magnetic flux density in front of a transformer. When the magnetic fields are known in the body of the worker the induced current density can be calculated. Induced body current calculated with an impedance method, is also presented.
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- Neubauer, G, et al.
(författare)
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Feasibility of Future Epidemiological Studies on Possible Health Effects of Mobile Phone Base Stations
- 2007
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Ingår i: Bioelectromagnetics. - : Wiley. - 1521-186X .- 0197-8462. ; 28:3, s. 224 - 230
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Tidskriftsartikel (refereegranskat)abstract
- The increasing deployment of mobile communication base stations led to an increasing demand for epidemiological studies on possible health effects of radio frequency emissions. The methodological challenges of such studies have been critically evaluated by a panel of scientists in the fields of radiofrequency engineering/dosimetry and epidemiology. Strengths and weaknesses of previous studies have been identified. Dosimetric concepts and crucial aspects in exposure assessment were evaluated in terms of epidemiological studies on different types of outcomes. We conclude that in principle base station epidemiological studies are feasible. However, the exposure contributions from all relevant radio frequency sources have to be taken into account. The applied exposure assessment method should be piloted and validated. Short to medium term effects on physiology or health related quality of life are best investigated by cohort studies. For long term effects, groups with a potential for high exposure need to first be identified; for immediate effect, human laboratory studies are the preferred approach. © 2006 Wiley-Liss, Inc.
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- Salinas, Ener, 1957, et al.
(författare)
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A new technique for reducing extremely low frequency magnetic field emissions affecting large building structures
- 2007
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Ingår i: Environmentalist. - 0251-1088 .- 1573-2991. ; 27:4, s. 571-576
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Tidskriftsartikel (refereegranskat)abstract
- When large structures such as residentialcompounds or public buildings are under the influence ofextremely low frequency (ELF) magnetic fields, such asthe one generated by a system of railways fed by16.67 Hz, standard methods of designing shieldingstructures by numerical methods usually fail. The lattercan be explained by the difficulty posed in the computingprocess by the large aspect ratios involved due to thinlayers of metal (a few millimetres or centimetres) incontrast to the large dimensions of the affected structure(several tens of meters). In some cases one has to utilizespecial approximations such as surface conductivity,which are not easy to handle when the designed shieldingstructure is clearly three -dimensional. Other alternativessuch as experimentation in situ are very costly. Here, anew technique is presented of mitigating the field byusing three-dimensional propagation of induced currentsoptimizing the field reduction factors and minimizing thecost of shielding material. The particular designingmethod is a hybrid of numerical simulations combinedwith lab experimentation using scaled models of the largestructure. The method is rather cost-effective and flexible as various designs can be easily tested. Results are presented in the form of magnetic field values, at various locations in the buildings, before and after this mitigation technique is applied.
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