提高地电阻率观测精度研究

随着国民经济的快速发展,地电阻率的观测环境受到各种干扰,其中采用直流牵引技术的城市轨道交通干扰尤为严重,致使一些地电阻率观测台站的观测数据无法满足规范要求,部分台站因此被迫搬迁。进一步改善观测系统测量模式,提高其观测精度势在必行。通过多种方法实验,提出了一些抗干扰措施,达到了提高观测精度的目的,为进一步提升地电阻率观测质量做了技术铺垫。     

Analysis of the selected optical parameters of filters protecting against hazardous infrared radiation

The paper analyses the selected optical parameters of protective optic filters used for protection of the eyes against hazardous radiation within the visible (VIS) and near infrared (NIR) spectrum range. The indexes characterizing transmission and reflection of optic radiation incident on the filter are compared. As it follows from the completed analysis, the newly developed interference filters provide more effective blocking of infrared radiation in comparison with the currently used protective filters.     

苍山5.2级地震前电磁辐射异常

利用枣庄电磁信息台ＤＰＪ Ⅲ、ＵＬＦ Ⅲ及ＪＤ ０３型电磁辐射仪观测到的资料，分析了山东苍山５．２级地震前多数台站记录到的异常信息及其特征。     

可靠性强化试验技术在家电产品研发阶段中的应用

本文简要介绍了可靠性强化试验技术原理与特点,总结了可靠性强化试验技术在家电产品研发阶段中的应用方法,详细阐述了可靠性强化试验过程和试验剖面特点；给出了部分产品实施可靠性强化试验的结果与实施经验,论述了如何在家电产品中经济高效地实施可靠性强化试验技术.     

电磁辐射对环境的污染及防护措施

电磁辐射对环境的污染已引起人们的重视 ,早在 196 9就被联合国人类环境会议列为必须严格控制的现代公害之一。论述了电磁辐射的来源、危害及减少电磁辐射是对环境污染的防护措施。对全面了解电磁辐射对环境造成的污染及危害 ,提高自我防护意识具有参考价值     

Electromagnetic Action of Heavy-Current Equipment Operating With Power Frequency

The paper presents an analysis of the effect of magnetic fields of power frequency generated by heavy-current electric equipment on the environment. The results of computation and measurements of the magnetic field in the vicinity of power busducts are included. Possible hazards are considered that result from the effects of the magnetic field on workers present in the vicinity of busducts as well as secondary hazards caused by the degrading effect of the magnetic field on ferromagnetic structural materials (in reinforced concrete structures). Attention is given to an ergonomic aspect of interaction of the magnetic field with cathode ray tube computer monitors (annoying oscillation of the image).     

Health Risk Assessment of Occupational Exposure to a Magnetic Field From Magnetic Resonance Imaging Devices

Health care staff who operate magnetic resonance imaging (MRI) devices are exposed to a static magnetic field of significant spatial heterogenity always produced by MRI magnets during the whole shift. They can also be exposed to pulses of a time-varying magnetic field (gradient field) present only during patients’ examinations. The level of the workers’ exposure depends both on the type of the magnet and on the ergonomic design of each MRI device.

The paper presents methods used for measuring and assessing workers’ exposure. It also discusses the results of inspection measurements carried out next to approximately 20 MRI devices of approximately 0.2–2.0 T. The presented characteristic and overview of the variability of workers’ exposure to a variety of MRI devices supports the need for data on monitoring occupational exposure to MRI. International exposure assessment standards and guidelines (International Commission on Non-Ionizing Radiation Protection [ICNIRP], Institute of Electrical and Electronics Engineers [IEEE], American Conference of Governmental and Industrial Hygienists [ACGIH], European Commission directive), and those established in Poland are also compared.     

光污染管理政策与LED广告屏干扰光限制标准分析

在调研国外光污染管理政策的基础上,分析了中国光污染管理政策现状,参照现行监测技术规范,开展LED广告屏光污染测量和标准限值比较。测量结果表明:中国城市LED广告屏屏幕亮度超标严重,除了亮度外,亮度变化幅度是影响周围光环境舒适度的重要因素,白色等明亮颜色是导致居民区照度升高的重要色调。标准限值比较发现,为更好地保护光环境,应严格限制LED广告屏亮度排放值,推荐采用亮度最大值作为评价指标。     

电磁脉冲作用下单极子天线的超宽带响应

目的提出求解短波单极子天线在外界电磁脉冲作用下宽带响应的数值算法——基于利用矩量法的时域积分方法。方法为展开未知电流的时域系数,采用拉盖儿多项式作为整个时域空间中的展开基函数,对单极子天线的瞬态响应进行数值模拟,并和试验数据进行对比验证。结果文中提出的方法与试验数据匹配良好。结论试验结果验证了该方法的有效性,该分析方法可为天线或系统对外界有意电磁干扰的响应及防护研究提供输入条件。     

高压输变电工程电磁场对环境的影响及．防治

通过对高压输变电工程电磁场的研究，讨论了高压输变电工程产生的电磁场对环境及人体健康的影响，提出了降低高压输变电工程电磁场影响的相关对策和建议。