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说明电磁波不仅对电子设备有影响,而且对人体健康也有影响,从对高频电磁波的认识开始,讨论电磁波对人体的影响及人们为了身体健康而对电磁波采取的防护措施,同时对电磁波的安全性测定和正确使用安全性指标也做了说明。 相似文献
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通过对雾灵山国家级自然保护区的调查,研究保护区的生态沿革,分析保护区的生态功能、生态作用等生态效应,针对当前所存在的草甸严重退化、动物种群密度降低、水量减少等生态问题,提出对保护区的生态环境应尽快制定环境保护规范化,建立生物多样性保护权威机构,实行社区共管,开展科学生态旅游等措施。 相似文献
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作者在三年的反证后发现,近五年来,市场上叫卖防电磁辐照的小商品,纯属伪科技,撑得百姓不得安宁。为了还科技之本来,特研写本文,好让公众了解生态环境电平的量值及趋向,知道如何判别环境电平是否安全,避免在无知中上当受骗。 相似文献
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超量的电磁辐照,有损于人体健康,但各国的限值不统一,夹带着各种错处,且差值太大,这不但不符合人体的特性,而且混入不少臆造,现将突破性的研究成果,奉献给专业人员,以利推动这一科技,早日步入客观。 相似文献
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电磁辐射对人体的危害及防护措施 总被引:6,自引:0,他引:6
电磁辐射污染问题经过几十年的研究,虽然在非致热效应的影响问题上尚未达到共识,但对电磁辐射污染的存在人们已有了清楚的认识。本文就电磁辐射的来源、对人体的危害及防护措施作以介绍。 一、电磁辐射的来源 电磁辐射的主要来源是电讯系统中无线电和电视发射台及某些电子设备等,其次是工业生产、科学研究和医疗设备。此外,家用电器和通讯器材因与人群距离近,也是重要的辐射污染源,如微波炉、电脑、复印机、电视、手机等。 二、电磁辐射对人体的危害 电磁辐射主要有射频辐射和微波辐射两大类。生物体接受电磁辐射后大多会产生电场和磁… 相似文献
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本文首先介绍了室内空气污染的定义、室内空气中常见的污染物及其主要来源,分析 了室内空气中主要污染物对人体健康的影响,从而提出了保护室内环境的对策。 相似文献
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电脑和手机电磁辐射强度测试及防护对策 总被引:1,自引:0,他引:1
测试了电脑显示器和手机工作时电磁辐射强度的大小,总结了它们发射电磁波强度大小的规律,并与国家标准进行了比较,针对电磁波的危害提出了一些防护措施和对策。 相似文献
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由于城镇化进程的需要,越来越多的高层建筑出现在城市里,承担了我们的工作、居家、休闲娱乐的功能。随着公众环境意识逐步增强,高层建筑的电磁环境现状已成为公众关注的焦点。本文针对成都市区的高层建筑的电磁环境现状进行了调查分析。 相似文献
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随着厦门旅游业的发展,旅游人力资源存在的问题越来越受到关注。通过对厦门旅游人力资源的调查,分析了厦门旅游业人力资源存在的问题,推测了厦门旅游业人力资源总量和结构方面的需求,提出了政府、旅游企业和旅游人才中介机构不同层面的相应对策和建议,以期实现厦门旅游业的可持续发展。 相似文献
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G. Duranti A. Rossi N. Rosato G. Fazio G. Sacerdoti P. Rossi R. Falsaperla V. Cannelli R. Supino 《The Environmentalist》2005,25(2-4):113-119
Summary The biological effects of electromagnetic radiation at ultra high frequency on human keratinocytes were investigated. HaCaT
cell system, a spontaneously immortalized human keratinocytes cell line, was chosen as model since skin is usually exposed
to electromagnetic radiation at considered frequency more than inner tissues. HaCaT cells were exposed to a pure sinusoidal
field at a frequency of 900 MHz (average SAR levels ranging from 0.04 to 0.08 W/kg) in plane wave condition inside a GTEM
chamber for time intervals of 18 hours at a controlled temperature of 37∘C. Growth curves were obtained for exposed and control cells, and a reduction in the number of exposed cells in comparison
to unexposed ones was found; however the number of dead cells was not significantly different in exposed and unexposed samples.
In order to investigate whether the reduction in cell proliferation of exposed cells was due to the activation of a differentiative
process, the expression of two hallmarks of differentiation was examined. Both keratin 1 and involucrin expression was increased
in exposed in comparison to unexposed cells. These results suggest that this protocol of exposure to 900 MHz electromagnetic
field can trigger a differentiation program in HaCaT cells. 相似文献
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Vehicular and pedestrian traffic decreased top and root production, percent cover, and diversity of vegetation, and modified species composition on beach and foredune areas of Padre Island National Seashore and Nueces County Park. Degradation of vegetal cover was directly related to the type and intensity of traffic; species in heavily trafficked areas represented earlier successional stages than those in comparable undisturbed areas. 相似文献
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We analyzed the effects of changes in land cover on the water balance in Spain’s Marina Baixa County, on the Mediterranean
coast. To reveal how different land management strategies have affected the area’s environment, four municipalities within
the same catchment were studied: Benidorm, Callosa d’en Sarrià, Beniardà, and Guadalest. In the municipalities of Callosa
and Benidorm, the proportion of the area covered by woodland declined by 4.2% and 30.2%, respectively, and woodland was replaced
by agriculture and urban development. The abandonment of farmland produced a 17% increase in the proportion of the area covered
by vegetation in Guadalest and Beniardá, where frequent forest fires have exacerbated a decrease in the area of pine woodland.
Tourism development in Benidorm has been accompanied by an increase in the transportation infrastructure and by an expansion
of areas with an impermeable surface, with the lowest level of infiltration into the aquifer system. These changes have generated
a net water deficit in Callosa and Benidorm of more than 6 Mm3/year, creating a high demand for water imported from other municipalities (Guadalest and Beniardá) or from outside of the
county to maintain the sustainability of the current water management strategies. The Marina Baixa case study is representative
of many of the world’s coastal areas that are undergoing rapid urban development based on an inappropriate understanding of
human progress based mainly on economic development and thus provides insights into water management in other areas. 相似文献