烟气流量对除尘效率测定的影响

除尘效率是衡量废气污染原治理设备性能的重要指标。因现场监测条件的制约，会出现除尘系统进出口烟气流量差距过大的现象，由此不能真实反映除尘系统的状况。本文通过对实测数据的分析说明：对高效率除尘器而言，进出口烟气流量相关1-1.5倍时，对除尘效率的计算可视为无影响。     

云南雷暴的时空分布特征分析

利用1971~2005年云南132个气象站的逐日气象观测资料,对云南雷暴的时间、空间分布特点和变化特征进行分析研究,运用保证率公式计算了云南不同地区的雷暴可能初终日时空分布。分析结果表明:云南雷暴天气35年来在波动中呈减少趋势,年平均雷暴日滇西北最少,滇西南最多。滇东北、滇西北雷暴初日开始较晚,雷暴终日结束较早。全省雷暴集中发生在4~9月。全省雷暴日变化基本相同,呈两峰一谷的变化趋势,最大峰值发生在午后14~22时。     

宁波市公民防灾应急状况调查研究

为了解公民关于应急知识的掌握情况,也为制定应急宣传教育方法和重点教育内容提供依据,采用自编问卷对1 318名公民进行了调查。结果显示,宁波市公民防灾应急意识状况总体良好,但存在显著的性别差异、城乡差异、文化程度差异、年龄差异和职业状态差异。     

静电放电电磁辐射模式的建立与仿真

介绍了静电放电电磁辐射场的理论模型;针对长导体模型分析了其数学模型的建立方法;讨论了长导体模型实验仿真方法与结果.     

体育教学反馈与自我反馈运用的探讨

体育教学过程中,教学效果的好坏取决于师生双方对过程的调控程度,而对技能教学的调控,则依据教师的教学反馈和学生的自我反馈来实现。在体育教学过程中,教学反馈与自我反馈的有机结合,是提高教学质量的关键。     

大孔吸附树脂对烷基酚聚氧乙烯醚的吸附行为

烷基酚聚氧乙烯醚(APEOn)是一类重要的非离子表面活性剂,由于其生物代谢产物被证实具有较大的毒性,因此引起人们广泛关注.本文使用两种不同的大孔吸附树脂XAD-4、NDA-804对APEOn类物质NP10进行吸附,该技术可为使用大孔吸附树脂去除此类污染物提供理论依据.研究结果表明:XAD-4、NDA-804对NP10都有较好的吸附效果,温度对吸附有较大的影响,升高温度吸附量增大.NDA-804对NP10的吸附效果要好于XAD-4,这与它的化学特性以及孔结构有关.NP1O在两种树脂上的吸附都能用Langmuir吸附等温线方程很好的拟合,表明属于单层分子吸附.吸附热力学参数计算结果表明,XAD-4、NDA-804对NP10的吸附过程是吸热和自发的.吸附动力学拟合结果表明,NP10在XAD-4、NDA-804上的吸附都符合假二级反应动力学.     

Capacity of transportation and spread of COVID-19—an ironical fact for developed countries

Environmental Science and Pollution Research - The widespread epidemic of the COVID-19 in developed countries such as Europe and the USA has sparked many speculations. What factors caused the rapid...     

Coupling urban 3-D information and circuit theory to advance the development of urban ecological networks

Ongoing, rapid urban growth accompanied by habitat fragmentation and loss challenges biodiversity conservation and leads to decreases in ecosystem services. Application of the concept of ecological networks in the preservation and restoration of connections among isolated patches of natural areas is a powerful conservation strategy. However, previous approaches often failed to objectively consider the impacts of complex 3-D city environments on ecological niches. We used airborne lidar-derived information on the 3-D structure of the built environment and vegetation and detailed land use and cover data to characterize habitat quality, niche diversity, and human disturbance and to predict habitat connectivity among 38 identified habitat core areas (HCAs) in Nanjing, China. We used circuit theory and Linkage Mapper to create a landscape resistance layer, simulate habitat connectivity, and identify and prioritize important corridors. We mapped 64 links by using current flow centrality to evaluate each HCA's contribution and the links that facilitate intact connectivity. Values were highest for HCA links located in the west, south, and northeast of the study area, where natural forests with complex 3-D structures predominate. Two smaller HCA areas had high centrality scores relative to their extents, which means they could act as important stepping stones in connectivity planning. The mapped pinch-point regions had narrow and fragile links among the HCAs, suggesting they require special protection. The barriers with the highest impact scores were mainly located at the HCA connections to Purple Mountain and, based on these high scores, are more likely to indicate important locations that can be restored to improve potential connections. Our novel framework allowed us to sufficiently convey spatially explicit information to identify targets for habitat restoration and potential pathways for species movement and dispersal. Such information is critical for assessing existing or potential habitats and corridors and developing strategic plans to balance habitat conservation and other land uses based on scientifically informed connectivity planning and implementation.