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对绝缘子污闪的预测进行了研究。污闪的发生与当地的气象因素有密切的关系,结合当地的气象条件研究污闪的发生,建立当地的年度降水、积污期气温与污闪的BP神经网络,根据乌鲁木齐的气象特征与当地的污闪状况利用matlab软件进行了仿真,能够较好地预测次年的污闪发生情况,结果与实际情况比较符合。 相似文献
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关于南京市绿化问题的思考 总被引:6,自引:0,他引:6
随着经济的发展和人民生活水平的提高.广大人民群众的环境意识不断的增强.对城市的绿化要求越来越高。在南京城市建设快速发展的今天.笔者结合多年的城市市政规划管理经验.对南京城市绿化问题作一些探究.希望为有关部门的工作提供有益的借鉴。 相似文献
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植被增加边坡降雨入渗对边坡稳定性影响研究 总被引:2,自引:0,他引:2
植被根系提高土壤渗透性和抗侵蚀性,植被盖度越大径流起始时间越长,植被提高边坡的入渗率和减少土壤流失相互促进,共同作用的结果是保持水土,所以植被增加边坡降雨入渗的作用是十分显著的.大多数植物的根系分布在浅层,根际区土壤储水能力强,由于植被对根际区下层土壤的渗透性影响不大,而且认为植被对降雨入渗对根际区土壤水分的影响明显,而对边坡根际区下层土壤水分影响不明显,植被增加边坡降雨入渗不影响边坡深层稳定性. 相似文献
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Investigations were conducted to determine the pollution levels of air condensate and rain samples using the enhanced chemiluminescence (ECL) reaction. Air condensate samples were initially collected from roadside sites, non‐roadside sites, smoking‐exposed sites and non‐smoking‐exposed sites using an automatic dew collector. Rainwater was also collected throughout the sampling period. Samples were subsequently analysed using the ECL reaction, and pollution levels (Eclox Units) were calculated. Air condensate samples collected from roadside‐ and smoking‐exposed sites generally had higher pollution levels than those from non‐roadside‐ and non‐smoking‐exposed sites. Samples from both smoking‐exposed and traffic‐exposed sites generally had higher pollution levels than rainwater. Finally, in samples collected from roadside‐exposed sites and rainwater, the main polluting constituents were determined to be cationic/anionic components. In samples collected from smoking‐exposed sites, the main polluting constituents were determined to be organic components. 相似文献
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冷冻水温度、冷却水温度及冷冻水系统和冷却水系统的运行是影响冷水机组节能运行的主要因素,适当提高冷冻水出口和降低冷却水进口温度,并根据负荷变化相应改变冷冻水系统和冷却水系统的运行,可以达到节能运行的目的。 相似文献
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冷冻水温度、冷却水温度及冷冻水系统和冷却水系统的运行是影响冷水机组节能运行的主要因素,适当提高冷冻水出口和降低冷却水进口温度,并根据负荷变化相应改变冷冻水系统和冷却水系统的运行,可以达到节能运行的目的。 相似文献
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变风量空调系统温度模糊PID控制 总被引:2,自引:0,他引:2
将模糊PID控制应用于变风量空调系统中,任务是将送风温度和空调房间内的温度(回风温度)控制在各自的设定目标值附近。分别设计了变风量空调系统的送风温度模糊PID控制系统和室内温度(视为回风温度)模糊PID控制系统,通过调节冷冻水阀门的开度来控制送风温度,通过调节变频风机的转速来控制室内温度。应用所设计的模糊PID控制器对送风温度和空调房间的温度(即回风温度)进行了实时在线控制,控制结果表明模糊PID控制器设计合理,控制效果良好。 相似文献
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在边坡植被恢复中降雨入渗情况的预测尤为重要,为探究石漠化边坡格构内植被水泥土的降雨入渗过程,基于5组叠合式土柱降雨入渗试验,包括纯土、纯土+植株孔、2%和4%水泥含量土、4%水泥含量土+植株孔5组土柱,针对传统Green-Ampt入渗模型过于简化地把土柱分为饱和区与非饱和区,而不能模拟试验中发现的植株孔优先蓄水入渗产生的非饱和区前的过渡区问题,将土柱降雨入渗模型分为饱和区、湿润过渡区和非饱和区。在分层假设的基础上,对Green-Ampt入渗模型进行了改进,研究了植被水泥土的累计入渗深度、累计入渗量等随时间变化规律,并结合试验结果对改进后的模型进行了分析。结果表明:湿润锋运移深度的改进Green-Ampt模型计算值和试验实测值吻合较好,可以有效地模拟植被水泥土—维垂直入渗过程。改进G-A模型为针对石漠化边坡格构内植被水泥土生态恢复技术进行入渗分析,具有一定的工程实用价值。
相似文献14.
在钢化玻璃工艺过程控制中,工艺参数设定是否合理对产品的质量及成品率起着决定性的作用.在对每一个参数进行设定时,必须彻底了解这项参数的作用和设定的依据,以及相关参数之间的相互作用,才能保证优质工艺的实现.本文对钢化玻璃过程中工艺参数的设定进行了分析和探讨. 相似文献
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Over a period of 18 months, the dissolved organic carbon (DOC) concentration of a series of four lakes in North Wales was measured monthly. The lake catchment profiles consisted of an upland thin peat/soil (Llyn Cwellyn), an upland thin peat/soil associated with an adjacent area of small bog (Llyn Teyrn), an upland blanket bog (Llyn Conwy), and large lowland fen and fertile agricultural area (Llyn Cefni). The results examine the indirect effect of temperature and precipitation on the DOC concentrations found in the lakes fed by the catchments. The lowest DOC of the four sites was observed for Llyn Teyrn, varying from 1.2 to 3.30 mg/L, and with the highest being recorded for Llyn Cefni (5.45–10.83 mg/L). Temperature and rainfall data were both collected. Correlations with the DOC exhibited significant relationships with temperature for three of the sampled lakes Cwellyn (r 0.490), Teyrn (r 0.640) and Cefni (r 0.472). Recomputation versus 30‐ and 60‐day temperature lag times improved the correlation coefficients. The data showed weak and insignificant correlations for DOC versus rainfall for the three lakes, but the upland lake, Llyn Conwy, with its blanket bog catchment, did not demonstrate any statistical correlation with temperature, although it did show a significant correlation for DOC versus rainfall (r 0.553, P < 0.05). Over the sampling period, although tentative relationships were found among temperature, rainfall and DOC levels, an indirect association tempered by site hydrology is suggested. 相似文献
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Ingemar Höglund 《Building Research & Information》2013,41(6):317-324
Professor Höglund, of the Division of Building Technology, Royal Institute of Technology, Stockholm, submits a theoretical method of calculating extreme temperatures on the outer surfaces of buildings under non-stationary conditions, taking into account both heat tansfer by convection and exchange of short-wave and long-wave radiation with the surroundings. 相似文献
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通过分析山西省水资源缺乏的现状,对实施人工增雨作业的必要性进行了探讨,并从太原人工增雨基地建设内容、交通组织与建筑布局特点、建筑造型艺术处理等方面对太原人工增雨基地综合业务楼和雷达塔楼的建筑设计进行了介绍,为相关建筑的设计提供了思路,最终极大地促进山西经济和社会的发展。 相似文献