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Trans. Nonferrous Met. Soc. China 22(2012) 1470-1477 Ecological risk assessment of heavy metals in sediments of Xiawan Port based on modified potential ecological risk index ZHU Hui-na1, 2, YUAN... Administration, Guangxi University of Finance and Economics,Nanning 530003, China Received 30 June 2011; accepted 28 October 2011 Abstract: Modified potential ecological risk index (MRI) was proposed......
of underground goaf risk evaluation FENG Yan, WANG Xinmin, CHENG Aibao, ZHANG Qinli, ZHAO Jianwen (School of Resources and Safety Engineering, Central South University, Changsha 410083, China) Abstract: The method of neural networks was optimized, and the principal component analysis and neural networks were used to construct a model about underground goaf risk evaluation to evaluate the underground goaf risk......
and Springer-Verlag GmbH Germany, part of Springer Nature 2017 Abstract: This study presents a novel approach using theoretical analysis to assess the risk of rock burst of an island longwall panel... zone; stress distribution; rock burst risk 1 Introduction The island longwall panel poses a serious threat to the production and safety of underground coal mining throughout the world due to early strip......
大气降尘中重金属形态分析及生态风险评价胡恭任1,2,戚红璐1,于瑞莲2,刘海婷2(1.福建省泉州市华侨大学环境科学与工程系2.江西省南昌市东华理工大学核资源与环境教育部重点实验室)摘 要:总结国内外大气降尘重金属形态分析常用的两种方法--Tessier五步连续提取法和BCR连续提取法,用于土壤及沉积物中重金属生态风险评价,总结出适用于大气降尘重金属生态风险评价的方法--Hakanson潜在生态风险指数法和人工模拟酸雨淋溶法,提出了这些方法存在的问题和今后的发展方向.关键词:环境工程； 大气降尘； ......
concentrations were used to calculate the risk assessment code values for heavy metals leaching from the ash matrix. The leaching studies indicate that the heavy metals in the bottom ash and fly ash are bound to different fractions with different strengths. From the environmental and utilization perspectives, heavy metals in ashes posed different levels of environmental contamination risk. Only......
结果表明:该评价方法能解决隧道塌方中风险等级评价中诸多因素不确定性问题,可在实际工程中进行推广.关键词:隧道坍方；风险评估；未确知测度；熵；置信度识别准则Unascertained measure model of assessment tunnel collapse risk and its application in engineeringHE Mei-li1, LIU Ji1, 2...)Abstract:Due to the uncertain factors in evaluating the risk level for the tunnel collapse (TC), using the tunnel collapse and its impact on the relationship between factors as unascertained systems......
: In order to predict the invalidation risk of backfilling pipeline more accurately, the evaluation system of principal component analysis and the improved BP neural network was established. Ten primary... ingredients, as the input data of the optimized BP Neural Network which ended up with a more accurate risk prediction on invalidation of backfilling pipeline. The results indicate that the expected value......
,转化为有限区间,见表2. 2.2 属性测度函数 表2 突水风险评价指标及分级标准[21] Table 2 Indices and criteria for risk assessment of water inrush[21] 根据表2中的评价指标分级标准以及式(3)~(8),构造属性测度函数,如图1所示.其中,评价指标I1分为岩层可溶性与专家评分2种标准.I1,I2,I6和I7专家评分的属性测度函数一致(见图1(a)). 图1 突涌水风险评价指标属性测度函数 Fig. 1 Single attribute mathematical functions of risk indices of water inrush 2.3 指标权重分析 选用主观客观综合赋权法,该方法结合了频数统计法与层次分析法,不仅可参考专家意见,避免过于依赖统计或数学定量方法,同时可根据现实情况调整各评价指标,尽量......
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尔逊χ2检验 中图分类号:X913.4 文献标志码:A 文章编号:1672-7207(2011)06-1719-06 Probabilistic risk assessment method... principle of generalized linear models(GLM) was used in risk assessment method. The cumulative occurrence probability of the risk was transformed into logistic form according to its level. The risk......
