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941.
标准起草小组 《中国个体防护装备》2007,(2):29-32
GB20265—2006《耐化学品的工业用模压塑料靴》国家标准于2006年2月27日批准发布,2006年12月1日正式实施。这是一个产品标准,适用于在有酸、碱及相关化学品作业中穿用的塑料靴及橡塑靴的质量评价。 相似文献
942.
Cao Xinchun Wu Mengyang Zheng Yalian Guo Xiangping Chen Dan Wang Weiguang 《Regional Environmental Change》2018,18(2):465-475
Regional Environmental Change - China faces the dual challenge of water scarcity and food security with continued population growth. This paper explores methods to meet that demand without... 相似文献
943.
944.
Hongxia Liu Kimitaka Kawamura Bhagawati Kunwar Junji Cao Jiaquan Zhang Changlin Zhan 《Journal of the Air & Waste Management Association (1995)》2019,69(4):513-526
PM2.5 (particulate matter with an aerodynamic diameter <2.5 μm) samples were collected in Huangshi, central China, from March 2012 to February 2013 and were analyzed for dicarboxylic acids (diacids) and related compounds (DARCs). Oxalic acid (C2; 416 ng m?3) was the most abundant species, followed by phthalic (Ph; 122 ng m?3), terephthalic (tPh; 116 ng m?3), succinic (C4; 70.4 ng m?3), azelaic (C9; 67.9 ng m?3), and adipic (C6; 57.8 ng m?3) acids. Relatively high abundances of Ph and tPh differed from the distribution in urban and marine aerosols, indicating contributions from nearby anthropogenic sources. Glyoxylic acid (ωC2; 41.4 ng m?3) was the dominant oxoacid, followed by 9-oxononanoic (ωC9; 40.8 ng m?3) and pyruvic (Pyr; 24.1 ng m?3) acids. Glyoxal (Gly; 35.5 ng m?3) was the dominant α-dicarbonyl. Highest average concentrations were found for C2, ωC2, and C9 in autumn, for C4, for Pyr and C6 in spring, for Ph, ωC9, and Gly in summer, whereas the lowest values were observed in winter. Seasonal variations and correlation coefficients of DARCs demonstrate that both primary emissions and secondary production are important sources. Principal component analysis of selected DARCs species suggests that a mixing of air masses from anthropogenic and biogenic sources contribute to the Huangshi aerosols.
Implications: Both primary emissions and secondary production are important sources of diacids and related compounds in PM2.5 from Huangshi, central China. Principal component analysis of selected diacids in Huangshi aerosols suggests that mixing of air masses from anthropogenic and biogenic sources contribute to ambient aerosols in central China. 相似文献
945.
China experienced a decline of water use intensity in the 11th Five Year Plan,but the water use intensity actually increased in 2009.To the best of our knowledge,the index decomposition analysis method was rarely used to analyze changes in water use,and no decomposition analysis has investigated the role of regional economy in the decline of water use intensity.In this paper,we use logarithmic mean Divisia index(LMDI)techniques to decompose the change of water use intensity in the period 2006-2010.We find that the change of industrial water use intensity is confirmed as the dominant contributor to the decline in the overall water use intensity;the regional structure effect and the industrial structure effect is positive to the decline of overall water use intensity;the decline of China’s water use intensity is mainly attributed to the effect of developed eastern provinces;meanwhile,the effect of central and undeveloped western is also positive to the decline of overall water use intensity;at least one out of three effects is positive to the decline of water use intensity in the different provinces;the intensity effect is positive and the industrial structure effect is positive to the declines of China’s water use intensity based on chaining approach except the period 2008-2009,individually;and the deviation of regional structure effect and industrial structure effect between with regional economy and without regional economy in LMDI is 0.9 and2.3 m~3/10~4 RMB,respectively. 相似文献
946.
Ni Qingjian Cao Xuehan Tan Chaoqun Peng Wenqiang Kang Xuying 《Environmental science and pollution research international》2023,30(5):11516-11529
Environmental Science and Pollution Research - The analysis and prediction of water quality are of great significance to water quality management and pollution control. In general, current water... 相似文献
947.
Zhijian Liu Haiyang Liu Hang Yin Rui Rong Guoqing Cao Qihong Deng 《Frontiers of Environmental Science & Engineering》2021,15(3):36
948.
Guyuan Luo Faping Bu Xiaoyi Xu Jia Cao Weiqun Shu 《Environmental monitoring and assessment》2011,173(1-4):55-64
Field surveys were carried out from January 2007 to December 2008 to investigate seasonal variations of dissolved inorganic nitrogen (DIN) and phosphorus (DIP) transported to the Linjiang Bay of the Three Gorges Reservoir, China. The results revealed that both DIN and DIP exhibited large seasonal variability. DIN (dominated by NH4?CN) concentrations were drastically higher in the dry season than those in the rainy season, and the same seasonal patterns of DIP concentrations and DIN and DIP fluxes were observed but inverse to that of DIN concentrations. The interannual variation in DIN fluxes descended by 28.2% from 2007 to 2008, while DIP fluxes increased by 40.9%, which were closely constant with interannual changes in DIN and DIP concentrations, respectively. The study indicated that nutrient fluxes (DIN and DIP) were strongly correlated with both nutrient concentrations and river discharge, and the Linjiang Bay received approximately 3,416 × 103 kg DIN and 324 × 103 kg DIP every year. In addition, DIN mainly originated from point sources, but DIP originated from non-point sources. It is shown that to control point source pollution is the most effective step for water quality improvement and reducing nutrient loading inputs in the Linjiang Bay. 相似文献
949.
湖南省宁乡县巷子口—沩山荒漠化治理研究 总被引:1,自引:0,他引:1
曹学章 《生态与农村环境学报》1998,(1)
巷子口—沩山地处我国南方红壤丘陵地区。由于长期过度砍伐和陡坡开垦等不合理人为活动的影响,加上降雨多且暴雨集中、丘陵地形和花岗岩母质的自然条件,这里由水蚀导致的荒漠化一度比较严重,1982年以来,采取封禁与造林相结合恢复植被、多途径解决农村能源问题、坡耕地退耕还林、广泛开展宣传、加强机构建设、落实政策、加强监督等措施,开展了荒漠化治理,取得了显著的生态和经济效益。 相似文献
950.