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161.
The experiments on pollutant movement in surf zone were conducted on the two gentle beaches(with slope of 1:100 and 1:40, respectively), for diverse wave cases. The movement contours and direction of pollutants, under the action of regular and random waves with diverse wave amplitudes, were provided and studied in this paper. It was shown that, due to complicated hydrodynamics in surf zone, the pollutant movement state is quite complicated and different from that in pure current zone. 相似文献
162.
Xiaolan Li Guiqian Tang Liguang Li Weijun Quan Yangfeng Wang Ziqi Zhao Ningwei Liu Ye Hong Yanjun Ma 《环境科学学报(英文版)》2022,34(3):300-310
Visibility observed at different altitudes is favorable to understand the causes of air pollution. We conducted 4-years of observations of visibility at 2.8 and 60 m and particulate matter(PM) concentrations from 2015 to 2018 in Shenyang, a provincial city in Northeast China. The results indicated that visibility increased with the increasing height in winter(especially at night), and decreased with height in summer(especially at the daytime). PM concentration exhibited opposite vertical variati... 相似文献
163.
164.
7种拟除虫菊酯农药对卤虫的急性毒性研究 总被引:1,自引:0,他引:1
为了研究7种拟除虫菊酯农药对美国大盐湖卤虫(GSL Artemia)的急性毒性效应,挑选18~24 h内孵出的卤虫,继续培养24 h后得到Ⅱ~Ⅲ龄卤虫无节幼体,将其暴露于所设浓度梯度的拟除虫菊酯溶液中进行24 h急性毒性实验,记录卤虫无节幼体在各浓度溶液中的死亡情况,并将所得数据进行Probit分析。结果表明,卤虫对不同拟除虫菊酯的敏感性相差较大。氯菊酯、氯烯炔菊酯、炔咪菊酯、胺菊酯、联苯菊酯、高效氯氟氰菊酯和溴氰菊酯对卤虫的24 h半致死浓度(24 h-LC50)分别为4.68、14.82、18.12、38.21、>100、>100和>100 mg.L-1。因此,在含有卤虫的盐水环境中,应尽量避免使用毒性较高的氯菊酯,而选择使用联苯菊酯、高效氯氟氰菊酯和溴氰菊酯等毒性较低的农药。 相似文献
165.
Hefu Pu Aamir Khan Mastoi Xunlong Chen Dingbao Song Jinwei Qiu Peng Yang 《Frontiers of Environmental Science & Engineering》2021,15(4):67
166.
Fanling Meng Yunxue Xia Jianshuai Zhang Dong Qiu Yaozhu Chu Yuanyuan Tang 《Frontiers of Environmental Science & Engineering》2021,15(6):116
167.
陕西省宝鸡市自然灾害社会脆弱性评估 总被引:1,自引:0,他引:1
自然灾害社会脆弱性的研究对于减轻自然灾害的社会经济损失和提高应灾恢复能力具有重要现实意义。选取涵盖自然灾害暴露性、敏感性及恢复能力的社会经济指标,利用组合赋权法对陕西省宝鸡市各县区自然灾害社会脆弱性进行了分析评价。结果表明:区域人口、经济密度及财产数量是影响自然灾害社会脆弱性的主要因素;区域的人口结构及社会结构决定了其对自然灾害的敏感程度;宝鸡市自然灾害社会脆弱性具有明显的空间差异性,脆弱性较高的地区主要分布在市辖区范围的金渭两区,而陈仓区和凤县是自然灾害社会脆弱性较低的地区。 相似文献
168.
Huan HE Qian SUI Shuguang LU Wentao ZHAO Zhaofu QIU Gang YU 《Frontiers of Environmental Science & Engineering》2015,9(6):962-969
The influence of three effluent organic matter (EfOM) model compounds, humic acid (HA), bovine serum albumin (BSA), and sodium alginate (AGS), on the ozonation of bezafibrate (BF), a typical pharmaceutical and personal care product (PPCP), was investigated. The results show that ozonation efficiently removed BF from aqueous solution with removal efficiencies>95% within 8 min for all conditions. The reaction rate of BF decreased with increasing model compounds concentrations and the influence was more pronounced for HA and BSA, while less pronounced for AGS. Although BF concentration was significantly reduced, the degree of mineralization achieved was only approximately 11%. The addition of HA and BSA improved the mineralization of the solution, while the influence of AGS was minor. The acute toxicity of BF solution during ozonation was determined using the Luminescent bacteria test, and the toxicity exhibited an initial increase and a successive reduction. An overall decreased acute toxicity was observed with an increase of HA. The presence of BSA increased the formation rate of toxicity intermediates and resulted in inhibition peak forward. 相似文献
169.
Zhaoyu Zhu Jiubing Xie Jianguo Zhang Huaxian Liang Yan Qiu Zhen Xia 《国际发展与全球生态学杂志》2013,20(4):421-427
Prevention and treatment of geological hazards is important for the sustainable development of human society. Surface geological hazards alone caused direct economic losses of ¥3.47 billion, with 768 deaths and 785 injuries in Guangdong Province, South China, from 1994 to 2005. The major factors causing geological hazards can be categorised into three types: geo-environmental, climatic-meteorological and human activity. Accompanied by rapid economic development and population growth, human activities can cause geological hazards that are as serious as those caused by natural factors. The authors propose some suggestions for prevention and treatment of geological hazards to achieve sustainable development on the Chinese coast. 相似文献
170.
Iron plays an important role in marine primary productivity, and Synechococcus species as major contributors to the total photosynthetic biomass in the world’s oceans might be limited by iron supply in
some regions. The present study aimed to compare the photosynthesis and flow cytometric signals of four Synechococcus strains grown under different iron concentrations with either nitrate or ammonium as the sole nitrogen source. Two oceanic
strains were much more sensitive to iron limitation than two coastal strains. The inhibition of iron limitation on the growth,
maximal PSII photochemical yield, maximal rate of relative electron transport and photochemical quenching of the two oceanic
strains was higher than for their coastal counterparts. Under iron limitation condition, the connectivity factor between individual
photosynthetic units (ρ) increased for the two coastal strains, while decreased for the two oceanic strains. Furthermore,
iron limitation accelerated the Q
A re-oxidation of the two oceanic strains and the PQ pool re-oxidation of the two coastal strains. Under iron limitation condition,
the cell size of the two coastal strains and intracellular pigment concentrations of the two oceanic strains decreased, while
the side light scatter/front light scatter (SS/FS) ratio of the two coastal strains increased. In contrast to iron limitation,
nitrogen source only marginally affected the photosynthesis of the four Synechococcus strains. Ammonium enhanced the growth of the two coastal strains under iron-replete condition. For the two oceanic strains,
ammonium increased their cell size and decreased their SS/FS ratio and intracellular pigment concentrations under iron-deplete
and iron-replete conditions. 相似文献