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Radiat Prot Dosimetry ; 162(4): 478-86, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24553048


With the increasing city size, high-power electromagnetic radiation devices such as high-power medium-wave (MW) and short-wave (SW) antennas have been inevitably getting closer and closer to buildings, which resulted in the pollution of indoor electromagnetic radiation becoming worsened. To avoid such radiation exceeding the exposure limits by national standards, it is necessary to predict and survey the electromagnetic radiation by MW and SW antennas before constructing the buildings. In this paper, a modified prediction method for the far-field electromagnetic radiation is proposed and successfully applied to predict the electromagnetic environment of an area close to a group of typical high-power MW and SW wave antennas. Different from currently used simplified prediction method defined in the Radiation Protection Management Guidelines (H J/T 10. 3-1996), the new method in this article makes use of more information such as antennas' patterns to predict the electromagnetic environment. Therefore, it improves the prediction accuracy significantly by the new feature of resolution at different directions. At the end of this article, a comparison between the prediction data and the measured results is given to demonstrate the effectiveness of the proposed new method.

Radiação Eletromagnética , Monitoramento de Radiação/métodos , Ondas de Rádio/efeitos adversos , China , Exposição Ambiental , Humanos , Monitoramento de Radiação/estatística & dados numéricos , Proteção Radiológica/normas , Proteção Radiológica/estatística & dados numéricos
Chem Commun (Camb) ; 50(6): 691-4, 2014 Jan 21.
Artigo em Inglês | MEDLINE | ID: mdl-24286108


A chiral nematic liquid crystal-photopolymerizable monomer-chiral azobenzene compound composite was prepared and then polymerized under UV irradiation. The reflection wavelength of the composite can be extended to cover the 1000-2400 nm range and also be adjusted to the visible light region by controlling the concentration of chiral compounds.