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51.
移动通讯发射基站功率密度对辐射环境影响分析 总被引:1,自引:0,他引:1
采用理论预测和实际测量的方法,对辽宁省移动通信有限公司的发射基站的电磁辐射对周边环境的影响做出预测并实际测量了场强,测算出污染半径及范围,为环境管理提供了技术支持。 相似文献
52.
Marzieh Mokarram Hamid Reza Pourghasemi Huichun Zhang 《Frontiers of Environmental Science & Engineering》2020,14(6):114
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从220 kV高压架空输电线路工程的导线不同排列方式入手,分析不同导线排列方式下输电线路产生的电磁环境影响,通过对相同电压等级的同塔四回路输电线在导线水平排列和垂直排列两种方式下对周围电磁环境影响的比较分析,探讨此两种导线排列方式对周围环境的影响程度。同时,通过预测输电线路在导线相同排列方式下不同相序布置时对周围环境的影响,对今后的高压输电线路架线方式从减小环境影响角度考虑提出建议。 相似文献
56.
Leif G. Salford Henrietta Nittby Arne Brun Gustav Grafström Jacob L. Eberhardt Lars Malmgren Bertil R. R. Persson 《The Environmentalist》2007,27(4):493-500
The environment in which biology exists has dramatically changed during the last decades. Life was formed during billions of years, exposed to, and shaped by the original physical forces such as gravitation, cosmic irradiation and the terrestrial magnetism. The existing organisms are created to function in harmony with these forces. However, in the late 19th century mankind introduced the use of electricity and during the very last decades, microwaves of the modern communication society spread around the world. Today one third of the world’s population is owner of the microwave-producing mobile phones. The question is: to what extent are living organisms affected by these ubiquitous radio frequency fields? Since 1988 our group has studied the effects upon the mammalian blood-brain barrier (BBB) by non-thermal radio frequency electromagnetic fields (RF-EMF). These have been revealed to cause significantly increased leakage of albumin through the BBB of exposed rats as compared to non-exposed animals—in a total series of about two thousand animals. One remarkable observation is the fact that the lowest energy levels give rise to the most pronounced albumin leakage. If mobile communication, even at extremely low energy levels, causes the users’ own albumin to leak out through the BBB, also other unwanted and toxic molecules in the blood, may leak into the brain tissue and concentrate in and damage the neurons and glial cells of the brain. In later studies we have shown that a 2-h exposure to GSM 915 MHz at non-thermal levels, gives rise to significant neuronal damage, seen 28 and 50 days after the exposure. In our continued research, the non-thermal effects (histology, memory functions) of long-term exposure for 13 months are studied as well as the effects of short term GSM 1,800 MHz upon gene expression. Most of our findings support that living organisms are affected by the non-thermal radio frequency fields. Studies from other laboratories in some cases find effects, while in other cases effects are not seen. Our conclusion is that all researchers involved in this field have the obligation to intensify this research in order to reduce, or avoid, the possible negative effects of the man made microwaves! 相似文献
57.
手机对人体的电磁生态效应与对策 总被引:1,自引:0,他引:1
介绍移动通信用便携式收发信机对人体电磁生态效应的原理,研究现状,并就如何减少手机对人体的电磁影响提出几点看法和建议。 相似文献
58.
防电磁辐射屏蔽材料的制备与性能研究 总被引:6,自引:0,他引:6
主要研究了电磁屏蔽材料的配制及加工工艺。本材料采用聚氯乙烯树脂为基材,化学镀镍的玻璃纤维为导电填充物复合而成,具有较好的屏蔽效果,且有良好的阻尼和阻燃性能 相似文献
59.
E. Battisti A. Albanese L. Bianciardi E. Piazza M. Rigato A. Vittoria G. L. Messa N. Giordano 《The Environmentalist》2007,27(4):441-445
Numerous studies have demonstrated the utility of extremely low frequencies (ELF) electromagnetic fields in the treatment
of pain. Moreover, the effects of these fields seems to depend on their respective codes. In our study we want to value the
effects and the safety of the TAMMEF (Therapeutic Application of a Musically Modulated Electromagnetic Field) system, which
field is piloted by a musical signal and its parameters are modified in time, randomly varying within the respective ranges,
so that all possible codes can occur during a single application. Ninety subjects, affected by chronic low back pain, were
enrolled in the study and randomly divided into three groups of 30 patients each: A exposed to TAMMEF, B exposed to ELF, C
exposed to a simulated field. All subjects underwent a cycle of 15 daily sessions of 30 minutes each and a clinical examination
upon enrolment, after 7 days of therapy, at the end of the cycle and at a follow-up 30 days later. All the patients of groups
A and B completed the therapy without the appearance of side effects: they presented a significant improvement of the subjective
pain and the functional limitation, which remained stable at the follow-up examination. In group C, there was no improvement
of the pain symptoms or articular functionality. This study suggests that the TAMMEF system is efficacious and safe in the
treatment of patients with chronic low back pain. 相似文献
60.
The 21st century medicine is characterized with increasing variety of diagnostic and therapeutic devices that implement magnetic
and electromagnetic fields most of which utilize time varying signals. In many cases, however, these devices are used without
proper knowledge of the physical parameters of the applied signals. In an attempt to facilitate the use of magnetotherapeutic
devices, the basic principles of physical and biophysical dosimetry in clinical settings are discussed in this article. 相似文献