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为深入研究电气火灾中护套线因过电流诱发短路故障的转化过程,搭建RVVB护套线过电流诱发短路故障电路,统计短路发生概率,借助高速影像,获取短路发生的时间和次数,分析护套线起火燃烧过程.结果表明:在过电流故障发生1 h内,I≤16 A时护套线仅线芯发热、绝缘炭化,无法诱发短路;I=24 A时护套线发生短路概率为40%,在9... 相似文献
114.
Study on phosphorus loadings in ten natural and agricultural watersheds in subtropical region of China 总被引:3,自引:0,他引:3
Yuyuan Li Cen Meng Ru Gao Wen Yang Junxia Jiao Yong Li Yi Wang Jinshui Wu 《Environmental monitoring and assessment》2014,186(5):2717-2727
Water eutrophication in subtropical regions of southern China threatens watershed health and is of major concern. However, annual phosphorus (P) loading and its dominant causes are still unclear, especially at the watershed scale. In this study, we investigated dynamic P loadings and associated factors (e.g., land use, livestock production, and runoff depth) in ten watersheds that varied in area from 9 to 5,212 ha in a hilly area of Hunan Province, China. A flowmeter was installed at the outlet of each watershed, and total P (TP) and soluble P (SP) concentrations were monitored periodically from June 2010 to October 2012. The results showed that annual P loadings (APLs) in the ten watersheds ranged from 22.8 to 247.8 kg P/km2 and that P loss primarily occurred from April to June of each year during the main rainfall season in the study area. In addition, the average eutrophication (>0.05 mg P/L) ratio for stream waters was 86.7 % during the study period, which was indicative of a potentially serious condition for the local water environments. Annual P loadings were linearly related to livestock density (LD; R?=?0.92, p?<?0.01), whereas the eutrophication ratio of stream water was significantly (p?<?0.05) correlated with LD (R?=?0.61), percentage cropland (R?=?0.71), and percentage forest cover (R?=??0.68). Thus, it is concluded that the control of livestock production has the greatest potential for reducing P loadings in watersheds in this subtropical area. This will be beneficial to the amelioration and protection of local environment. 相似文献
115.
Reem Hajjar Peter Cronkleton Emily Etue Peter Newton Aaron J.M. Russel Januarti Sinarra Tjajadi Wen Zhou Arun Agrawal 《Conservation biology》2016,30(6):1357-1362
Conservation and development practitioners increasingly promote community forestry as a way to conserve ecosystem services, consolidate resource rights, and reduce poverty. However, outcomes of community forestry have been mixed; many initiatives failed to achieve intended objectives. There is a rich literature on institutional arrangements of community forestry, but there has been little effort to examine the role of socioeconomic, market, and biophysical factors in shaping both land‐cover change dynamics and individual and collective livelihood outcomes. We systematically reviewed the peer‐reviewed literature on community forestry to examine and quantify existing knowledge gaps in the community‐forestry literature relative to these factors. In examining 697 cases of community forest management (CFM), extracted from 267 peer‐reviewed publications, we found 3 key trends that limit understanding of community forestry. First, we found substantial data gaps linking population dynamics, market forces, and biophysical characteristics to both environmental and livelihood outcomes. Second, most studies focused on environmental outcomes, and the majority of studies that assessed socioeconomic outcomes relied on qualitative data, making comparisons across cases difficult. Finally, there was a heavy bias toward studies on South Asian forests, indicating that the literature on community forestry may not be representative of decentralization policies and CFM globally. 相似文献
116.
Li Ning Wang Jinye Wang Haoyu Fu Bolin Chen Jianjun He Wen 《Environmental science and pollution research international》2021,28(34):46100-46115
Environmental Science and Pollution Research - It is of great significance for the coordinated development of the environment and the economy to study the impact of the human driving factors of... 相似文献
117.
Wen Jianghui Zhen Bianyu Pu Zhenyu Peng Xia Tan Junjun Shao Zhongbao Bao Bosheng Ran Zhiping Gao Qishuang Deng Bing 《Environmental science and pollution research international》2021,28(9):10564-10575
Environmental Science and Pollution Research - The livestock manure nitrogen load on farmland (LMNLF) is often used to assess the potential environmental pollution risk of livestock manure nitrogen... 相似文献
118.
Xu Su Gong Ping Ding Wen Wu Shengchun Yu Xinwei Liang Peng 《Environmental science and pollution research international》2021,28(47):66990-66997
Environmental Science and Pollution Research - Paspalum distichum L. was tested to evaluate their phytoremediation capacity for Hg contaminated soil through analyzing the dissipation of Hg in soil... 相似文献
119.
Jiang Chong Yang Zhiyuan Li Minting Dai Jialing Wang Xinchi Zhang Haiyan Yang Long Zhao Lingling Wen Meili Zhou Ping 《Environmental science and pollution research international》2021,28(12):14720-14738
Environmental Science and Pollution Research - Soil erosion threatens environmental sustainability worldwide. Exploring the trajectories of soil erosion and associated drivers is of great... 相似文献
120.
Gao Huadong Huang Yanli Li Wei Li Junmeng Ouyang Shenyang Song Tianqi Lv Fengyuan Zhai Wen Ma Kun 《Environmental science and pollution research international》2021,28(46):65363-65373
Environmental Science and Pollution Research - In the process of coal gangue surface accumulation and underground filling disposal, the heavy metals contained in coal gangue will inevitably... 相似文献