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对北京中央电视塔周围25 km2区域电磁环境质量分别进行了射频的网格法手工监测和车载巡测自动监测,通过SPSS软件等对两种监测方法获取的数据进行了统计对比分析,发现两组数据在总体水平及数值分布特征上较为接近,因此车载巡测监测可以替代网格法监测。以车载巡测数据为基础,绘制了实测数据的道路电磁地图,利用插值法绘制了区域电磁地图,对区域电磁环境质量进行了直观表征。从回应公众关注和城市电磁规划出发,建议今后可利用车载巡测监测加强时域和频域的监测。 相似文献
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格栅类通透性吊顶对水喷淋控火性能影响的实验研究 总被引:1,自引:1,他引:0
通过实验研究了格栅类通透性吊顶对水喷淋控火性能的影响,并利用燃料燃尽时间来计算控火有效性因子来量化这种影响.研究结果表明:格栅会降低水喷淋控火性能,与格栅类吊顶形式、喷头安装高度和工作压力流量有关.在确定的吊顶形式和尺寸下,存在着对控火性能影响最大的喷头安装高度.在实际工程应用中应根据具体格栅特性,合理设计喷头安装高度,以降低格栅的不利影响,保证水喷淋的控火有效性. 相似文献
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罗力红 《石油化工环境保护》2000,(3):53-54
为截留不中漂浮物面高斩格珊,以往多采用铜材制作。由于所处特殊工作环境,普遍存在慢问题。本文简要分析了格珊腐蚀的原因,结合工作实例介绍了采用玻璃钢制作格栅所取得的良好效果。 相似文献
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The study of a method of regional environmental risk assessment 总被引:2,自引:0,他引:2
Regional environmental risk assessment can be defined as risk assessment which deals with a spatial scale that contains multiple habitats with multiple sources of many stressors affecting multiple endpoints. The characteristics of the landscape also affect the estimated risk. In this paper, an information diffusion method based on a grid system is proposed to assess regional environmental risk. The risk information on a single environmental risk source can be diffused effectively by using fuzzy set theory. Regional environmental risk values obtained from information diffusion can be clustered on classification criteria and different environmental risk levels can be depicted in a spatial partition map. Huangge Town and Nansha Town located in the Nansha Area of Guangzhou City in China were selected as model cases. The results derived from this information diffusion method will help the local government to optimize the distribution of industrial areas and establish risk prevention measurements and emergency management procedures. 相似文献
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Abdullah Al-Badi 《International Journal of Sustainable Engineering》2020,13(3):230-241
ABSTRACT The aim of this article is to analyse the performance of the Photovoltaic (PV) and to study the effect of soiling on the energy generation under Muscat environmental conditions. The generated energy is consumed in the eco-house, and the access energy is fed back to the electric grid. Two-ways metre was used to record the energy taken from the grid or fed back to the grid. The system was monitored from December 2014 until today. Various performance parameters of the plant were evaluated which include system efficiency, performance ratio (PR), capacity factor (CF) and different types of PV system losses and yields. The annual average values of recorded ambient temperature and solar radiation were 32°C and 482 W/m2, respectively. The total annual energy produced was 23,595 kWh, whereas the annual average daily reference yield, array yield and final yield were 5.59, 3.78 and 3.64 kWh/kWP/day, respectively. The annual average daily PR and CF were 0.67 and 0.15, respectively, while the annual average system efficiency was 10.3%. Furthermore, the annual average daily capture, system and cell temperature losses were 1.82, 0.14 and 2.95 h/day,respectively, with a small reduction in energy production when modules left uncleaned. 相似文献
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此文对网格法作了回顾总结,详细说明了网格法的基本原理,阐述了至今用于网格制作、记录和分析网格的各种实验技术和数据处理技术,简要介绍了近期国内外在网格法研究和应用方面的新动向,并指出了一些研究方向. 相似文献