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111.
北京市生活垃圾中重金属元素的污染特性调查及对策 总被引:10,自引:0,他引:10
采用现场调研取样和理化分析检测的方法 ,对北京市城区垃圾中的重金属含量、主要污染元素和主要污染物进行测定 ,并在调查和分析的基础上 ,提出北京市城区垃圾中重金属污染的防治对策 ,为废弃物减量化、无害化与资源化提供了科学的依据和重要参考。 相似文献
112.
电梯门区故障是电梯整体主要故障之一。基于目前电梯门区常见故障或者已经发生的事故,本文系统性地建立电梯门区故障案例库并进行其软件研发;根据故障案例库中已知的案例信息得到故障类型风险的相关信息,进行风险分析;将故障案例中实际出现的故障类型组合种类归纳后,计算出每种组合的危害程度,按照危害程度值进行降序排列;软件系统根据用户输入的设备信息给出风险较高的故障组合和相应的预防措施。 相似文献
113.
114.
Hongkuan ZANG Yi XU Wei LI Guohe HUANG Dan LIU 《Frontiers of Environmental Science & Engineering》2012,6(4):549-558
In this study, an interval fuzzy mixed-integer energy planning model (IFMI-EPM) is developed under considering the carbon tax policy. The developed IFMIEPM incorporates techniques of interval-parameter programming, fuzzy planning and mixed-integer programming within a general energy planning model. The IFMIEPM can not only be used for quantitatively analyzing a variety of policy scenarios that are associated with different levels of carbon tax policy, but also tackle uncertainties expressed as discrete intervals and fuzzy sets in energy and environment systems. Considering low, medium and high carbon tax rates, the model is applied to an ideal energy and environment system. The results indicate that reasonable solutions have been generated. They can be used for generating decision alternatives and thus help decision makers identify desired carbon tax policy. 相似文献
115.
本文探讨了碲化镉量子点(CdTe QDs)对肝细胞的毒性效应及其影响因素,为探索量子点的肝毒性机制提供一定依据。采用人肝癌细胞(Hep G2)和人正常肝细胞(L02)为细胞模型,设置0、25、50和100μmol·L-14个浓度组,采用CCK-8法检测细胞生存率,石墨炉法检测细胞内镉元素含量,采用流式细胞术,装载荧光探针DCFH-DA检测细胞内活性氧水平,采用FITC/PI检测细胞凋亡以及JC-1检测细胞ATP水平。研究结果显示:CdTe QDs诱导2种肝细胞生存率降低,细胞凋亡率升高,细胞对QDs的摄入水平具有时间依赖性,细胞内活性氧水平显著升高,线粒体膜电位降低和ATP含量显著减少,且2种肝细胞比较发现L02细胞损伤程度更为严重。CdTe QDs对2种肝细胞造成损伤,对L02细胞损伤更明显,其原因是L02细胞对CdTe QDs摄取更多,导致进入细胞的QDs引发更为严重的损伤效应。 相似文献
116.
To explore biodegradation of 2-naphthol and its metabolites accumulated in wastewater treatment, a series of bio-degradation
experiments were conducted. Two main metabolites of 2-naphthol, 1,2-naphthalene-diol and 1,2-naphthoquinone, were identified by
high-performance liquid chromatography with standards. Combining fungus Aspergillus niger with bacterium Bacillus subtilis in the
treatment enhanced 2-naphthol degradation e ciency, lowered the accumulation of the two toxic metabolites. There were two main
phases during the degradation process by the kinetic analysis: 2-naphthol was first partly degraded by the fungus, producing labile
and easily accumulated metabolites, and then the metabolites were mainly degraded by the bacterium, attested by the degradation
processes of 1,2-naphthalene-diol and 1,2-naphthoquinone as sole source of carbon and energy. Sodium succinate, as a co-metabolic
substrate, was the most suitable compound for the continuous degradation. The optimum concentration of 2-naphthol was 50 mg/L.
The overall 2-naphthol degradation rate was 92%, and the CODCr removal rate was 80% on day 10. These results indicated that
high degradation rate of 2-naphthol should not be considered as the sole desirable criterion for the bioremediation of 2-naphtholcontaminated
soils/wastewater. 相似文献
117.
118.
为了查明遵化市地质灾害分布规律和发生机制,通过野外实际调查和搜集相关资料等方法,对辖区内各种地质灾害进行了细致的分析和研究,阐述了产生地质灾害的地质条件和诱发因素,并对今后地质灾害的发展趋势做了可靠性的预测,对地质灾害防治提出建设性意见。遵化市地质灾害以地面塌陷和泥石流危害最大,其防治措施应以预防为主,加强监管力度,并积极做好工程防治工作。 相似文献
119.
Kunpeng Zang Gen Zhang Xuemei Xu Nan Zheng Haoyu Xiong Haixiang Hong Kai Jiang Miao Liang 《环境科学学报(英文版)》2022,34(4):465-474
Sediment is recognized as the largest reservoir and source of methane (CH4) in the ocean, especially in the shallow coastal areas. To date, few data of CH4 concentration in sediment have been reported in the China shelf seas. In this study, we measured CH4 concentration in sediment and overlying seawater columns, and conducted an incubation experiment in the Bohai Sea in May 2017. CH4 concentration was found to be ranged from 3.075 to 1.795 μmol/L in sediment, which was 2 to 3 orders of magnitude higher than that in overlying seawater columns. The surface sediment was an important source of CH4, while bottom seawater acted as its sink. Furthermore, the net emission rate via sediment water interface (SWI) was calculated as 2.45 μmol/(m2∙day) based on the incubation experiment at station 73, and the earthquake may enhance CH4 release from sediment to seawater column in the eastern Bohai Sea. 相似文献
120.
Shuangyang Zhao Chengxin Chen Jie Ding Shanshan Yang Yani Zang Nanqi Ren 《Frontiers of Environmental Science & Engineering》2022,16(3):36