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排序方式: 共有1471条查询结果,搜索用时 718 毫秒
901.
Li Shuaishuai Guo Qing Jiang Lu Ahmed Zubair Dang Zhi Wu Pingxiao 《Environmental science and pollution research international》2021,28(28):37120-37129
Environmental Science and Pollution Research - Dissolved organic matter (DOM) has been widely existed in the soil, which has great influence on the adsorption of heavy metals by minerals. In this... 相似文献
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人工神经网络在煤与瓦斯突出预测中的应用 总被引:4,自引:0,他引:4
由于煤与瓦斯突出发生机理的复杂性,传统预测方法的应用受到很大的限制,而人工神经网络理论以其高度非线性映射的特性为解决这一问题提供了新的途径。以突出预测指标为基础,利用多层反向传播神经网络(BP网络)模型实现对突出危险性的预测。实例分析表明,模型精度很高,可用于工作面煤与瓦斯突出危险性的预测。 相似文献
904.
掺Fe金红石TiO2的制备及其可见光催化活性的评价研究 总被引:1,自引:1,他引:0
为提高金红石型TiO2的可见光吸收性能和光催化活性,以FeC2O4为Fe源,用浸渍法制备了掺铁金红石TiO2光催化剂。采用XRD、UV-Vis等手段对催化剂进行表征;以阿特拉津为目标污染物,在Vis/H2O2条件下对其催化活性进行了评估。结果表明,Fe以Fe2O3的形式负载在金红石型TiO2的表面;掺铁后金红石型TiO2显著拓宽了其可见光的吸收范围;煅烧温度为400℃时制得的光催化剂Fe-R-400℃的粒径结构和光催化活性最好。以Fe质量分数为1%的Fe-R-400℃作为光催化剂,控制反应体系的初始pH=3,催化剂投加质量浓度为1 g/L,H2O2初始浓度为1 mmol/L,经可见光照射反应15 min后,对初始质量浓度为10 mg/L的阿特拉津的去除率可达95.7%。催化剂循环试验表明,Fe在金红石TiO2表面负载比较牢固,催化剂具有较好的稳定性和重复使用性能。 相似文献
905.
Zhang Zhengfang Ouyang Zhuozhi Yang Jingjing Liu Yanjun Yang Chen Dang Zhi 《Environmental Chemistry Letters》2019,17(3):1421-1428
Environmental Chemistry Letters - The increasing presence of pesticides, pharmaceuticals and plasticizers in environmental media is threatening public health and ecosystems. Remediation of... 相似文献
906.
Peng Li Yuyou Zhi Jiachun Shi Lingzao Zeng Laosheng Wu 《Environmental science and pollution research international》2015,22(22):17937-17947
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909.
Cheung K Daher N Shafer MM Ning Z Schauer JJ Sioutas C 《Journal of environmental monitoring : JEM》2011,13(11):3277-3287
To investigate the diurnal profile of the concentration and composition of ambient coarse particles, three sampling sites were set up in the Los Angeles Basin to collect coarse particulate matter (CPM) in four different time periods of the day (morning, midday, afternoon and overnight) in summer and winter. The samples were analyzed for total and water-soluble elements, inorganic ions and water-soluble organic carbon (WSOC). In summer, highest concentrations of CPM gravimetric mass, mineral and road dust, and WSOC were observed in midday and afternoon, when the prevailing onshore wind was stronger. In general, atmospheric dilution was lower in winter, contributing to the accumulation of air pollutants during stagnation conditions. Turbulences induced by traffic become a significant particle re-suspension mechanism, particularly during winter night time, when mixing height was lowest. This is evident by the high levels of CPM mass, mineral and road dust in winter overnight at the near-freeway sites located in urban Los Angeles, and to a lesser extent in Riverside. WSOC levels were higher in summer, with a similar diurnal profile with mineral and road dust, indicating that they either share common sources, or that WSOC may be adsorbed or absorbed onto the surfaces of these dust particles. In general, the contribution of inorganic ions to CPM mass was greater in the overnight sampling period at all sampling sites, suggesting that the prevailing meteorological conditions (lower temperature and higher relative humidity) favor the formation of these ions in the coarse mode. Nitrate, the most abundant CPM-bound inorganic species in this basin, is found to be predominantly formed by reactions with sea salt particles in summer. When the sea salt concentrations were low, the reaction with mineral dust particles and the condensation of ammonium nitrate on CPM surfaces also contributes to the formation of nitrate in the coarse mode. 相似文献
910.