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Failure Mode and Effects Analysis Based on Z-Numbers and the Graded Mean Integration Representation

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Computer Modeling in Engineering & Sciences 2023年第2期134卷 1005-1019页

作者： Hanhan Zhang zhihui xu Hong Qian Xiaoyan Su School of Automation Engineering Shanghai University of Electric PowerShanghai200090China State Key Laboratory of Nuclear Power Safety Monitorig Technology and Equipment Shenzhen518172China

Failuremode and effects analysis(FMEA)is a widely used safety assessmentmethod inmany fields.Z-number was previously applied in FMEA since it can take both possibility and reliability of information into ***,the use of fuzzy weighted mean to integrate Z-valuations may have some drawbacks and is not suitable for some *** this paper,an improved method is proposed based on Z-numbers and the graded mean integration representation(GMIR)to deal with the uncertain information in ***,Z-numbers are constructed based on the evaluations of risk factors O,S,D for each failure mode by different ***,weights of the three risk factors and experts are ***,the integration representations of Z-numbers are obtained by a newmethod based on the ***,risk priorities of the failure modes are derived considering the weights of experts and risk *** examples and a case study are given to show the use of the proposed method and comparison with other *** results show that the proposed method is more reasonable,universal and simple in calculation.

关键词： Safety assessment FMEA risk priority number Z-number the graded mean integration representation

Experiencing urban forests for mitigation of negative emotions of people exposed to seasonal PM_(2.5)in Northeast China

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Journal of Forestry Research 2023年第5期34卷 1245-1261页

作者： Jie Zhang Zhi Yang Yuxiang Sun zhihui xu Tengfei Hui Peng Guo Forestry College Beihua UniversityJilin 132103People’s Republic of China Department of Human Resources Management School of Business and ManagementJilin UniversityChangchun 130021People’s Republic of China Environment and Resources College Dalian Minzu UniversityDalian 116600People’s Republic of China

Experiencing urban green and blue spaces(GBSs)can be a nature-based solution to improve mental well-being and cope with negative moods for people exposed to PM2.5 *** this study,a total of 1257 photos were collected to recognize their posted emotions of Sina Weibo users from 38 parks in 22 cities in Northeast China in 2021,when atmospheric PM_(2.5)and landscape metrics were evaluated for GBSs of each *** and winter had heavy atmospheric PM_(2.5)pollutions in resource-dependent cities of *** positive emotions(happy minus sad scores)decreased in larger green *** perception of blue space countered the presentation of sadness only for a limited period over four *** elevation decreased the level of happiness presented in ***,this study confirms that visiting large urban green spaces at low elevations can benefit the perception of positive sentiments for people exposed to PM_(2.5)in *** planning urban forests in Northeast China,more green spaces should be constructed in cities in southern Jilin province to alleviate air PM_(2.5)pollution and gain better well-being of local people.

关键词： Urban forest park Mental health and well-being Green and blue infrastructures Sustainable urban forests

Development and Validation of a HPLC Method for Determination of Flavone Glycoside-Camellianin B in Cephalotaxus Sinensis

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Journal of Beijing Institute of Technology 2017年第1期26卷 129-134页

作者： Yongqian Zhang zhihui xu Chao Wei Yan Chen Yulin Deng School of Life Science Beijing Institute of Technology Beijing 100081 China

A simple,rapid and sensitive method for the quantification of camellianin B in Cephalotaxus sinensis（***）a natural plant with anti-hyperglycemic effect,was developed and validated by reversed phase liquid *** separation was achieved on a C18 column and an isocratic elution was carried out at a flow-rate of 1.0 mL·min-1 with the acetonitrile-water containing0.1%formic acid（19∶81,v/v）.The detection wavelength was set at 330 *** calibration curve was linear over the concentration range of 0.25-50μg·mL-1 with correlation coefficients larger than0.999 *** limit of detection and limit of quantification were 0.09μg·mL-1and 0.25μg·mL-1,*** precisions and accuracy for all samples were *** validated method has been successfully applied for the quantification of camellianin B in *** harvested in different months and may also be used as the quality evaluation of this herb medicine.

关键词： column liquid chromatography flavone flavone glycoside

An Improved CREAM Model Based on DS Evidence Theory and DEMATEL

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Computer Modeling in Engineering & Sciences 2024年第3期138卷 2597-2617页

作者： zhihui xu Shuwen Shang Yuntong Pu Xiaoyan Su Hong Qian Xiaolei Pan State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen518172China School of Automation Engineering Shanghai University of Electric PowerShanghai200090China School of Safety and Management Engineering Hunan Institute of TechnologyHengyang421002China

Cognitive Reliability and Error Analysis Method(CREAM)is widely used in human reliability analysis(HRA).It defines nine common performance conditions(CPCs),which represent the factors thatmay affect human reliability and are used to modify the cognitive failure probability(CFP).However,the levels of CPCs are usually determined by domain experts,whichmay be subjective and ***’smore,the classicCREAMassumes that the CPCs are independent,which is *** the dependence among CPCs will result in repeated calculations of the influence of the CPCs on CFP and lead to unreasonable reliability *** address the issue of uncertain information modeling and processing,this paper introduces evidence theory to evaluate the CPC levels in specific *** address the issue of dependence modeling,the Decision-Making Trial and Evaluation Laboratory(DEMATEL)method is used to process the dependence among CPCs and calculate the relative weights of each CPC,thus modifying the multiplier of the *** detailed process of the proposed method is illustrated in this paper and the CFP estimated by the proposed method is more reasonable.

关键词： Human reliability analysis CREAM uncertainty modeling dependence Dempster-Shafer evidence theory DEMATEL

Assessment of Dependent Performance Shaping Factors in SPAR-H Based on Pearson Correlation Coefficient

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1813-1826页

作者： Xiaoyan Su Shuwen Shang zhihui xu Hong Qian Xiaolei Pan School of Automation Engineering Shanghai University of Electric PowerShanghai 200090China State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen518172China

With the improvement of equipment reliability,human factors have become the most uncertain part in the *** standardized Plant Analysis of Risk-Human Reliability Analysis(SPAR-H)method is a reliable method in the field of human reliability analysis(HRA)to evaluate human reliability and assess risk in large complex ***,the classical SPAR-H method does not consider the dependencies among performance shaping factors(PSFs),whichmay cause overestimation or underestimation of the risk of the actual *** address this issue,this paper proposes a new method to deal with the dependencies among PSFs in SPAR-H based on the Pearson correlation ***,the dependence between every two PSFs is measured by the Pearson correlation ***,the weights of the PSFs are obtained by considering the total dependence ***,PSFs’multipliers are modified based on the weights of corresponding PSFs,and then used in the calculating of human error probability(HEP).A case study is used to illustrate the procedure and effectiveness of the proposed method.

关键词： Reliability evaluation human reliability analysis SPAR-H performance shaping factors dependence pearson correlation analysis

Template-Free Hydrothermal Synthesis of β-FeOOH Nanorods and Their Catalytic Activity in the Degradation of Methyl Orange by a Photo-Fenton-Like Process

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Open Journal of Inorganic Non 2013年第4期3卷 58-65页

作者： zhihui xu Jianru Liang Lixiang Zhou Department of Chemistry College of Science Nanjing Agricultural University Nanjing China Department of Environmental Engineering College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing China

The rod-shaped form of crystalline β-FeOOH (akaganeite) was prepared by the template-free hydrothermal method with urea as the homogeneous precipitant. X-ray diffraction, field-emission scanning electron microscope and Fourier transform infrared spectrum were used to characterize the resulting products. The degradation of methyl orange (MO) was studied using the prepared nanostructure materials in a photo-Fenton-like process. MO degradation was effectively achieved by hydroxyl radicals that were generated in the heterogeneous catalysis process. Specific surface area of the prepared β-FeOOH was an important factor affecting the efficiency of MO degradation, which depended on the synthesis conditions such as the reaction temperature, the initial concentration of urea and FeCl3.6H2O as well as the n(urea)/n(Fe3+) ratio. The photodegradation efficiencies slightly decreased with the increase of initial pH in the range of 4.5 - 9.5, which indicated the prepared β-FeOOH catalyst can well overcome the drawback of a narrow pH range of homogeneous Fenton reaction. β-FeOOH catalysts loading and H2O2 concentration also play important effect on the degradation efficiency of MO. The prepared β-FeOOH showed good ability of reuse for multiple trials.

关键词： β-FeOOH Heterogeneous Photocatalysis Fenton Reaction Template-Free Hydrothermal Synthesis

Synthesis,characterization and application in a visible-light-Fenton-like process of SCNTs/β-FeOOH

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Synthesis,characterization and application in a visible-ligh...

采用自动诊断系统后核电应急决策流程的设计与分析

第十三届全国水处理化学大会暨海峡两岸水处理化学研讨会

作者： Yaqun Yu zhihui xu Lixiang Zhou College of Resources and Environmental Sciences Nanjing Agricultural University

The increasing organic pollutants in water sources in last decades promoted the development of water treatment *** oxidation have gained popularity for destructing organic pollutants in wastewater due to its formation of highly potent chemical species,·OH,for non-selective ***,the application of homogeneous Fenton reaction is limited by the narrow working pH range(2.5-3)and the generation

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核科学与工程 2022年第4期42卷 924-930页

作者：徐志辉中广核工程有限公司广东深圳518172

近期发生的多起核电站运行事件均暴露出运行班组在瞬态/事故等应急情境下存在集体决策机制不完善与不清晰的共性问题,且事后处置往往聚焦解决技术问题,忽视了引发技术问题的集体决策流程的设计问题。本文深入剖析了核电站应急状态下班... 详细信息

近期发生的多起核电站运行事件均暴露出运行班组在瞬态/事故等应急情境下存在集体决策机制不完善与不清晰的共性问题,且事后处置往往聚焦解决技术问题,忽视了引发技术问题的集体决策流程的设计问题。本文深入剖析了核电站应急状态下班组成员职责,集体决策的要求、内容、过程和机制,针对华龙一号引入自动诊断系统对运行班组决策带来的新要求,设计了一个具体的集体决策流程。该决策流程综合运行经验及纵深防御理念,有机结合班组成员的独立性和集体性,可以提高运行班组整体决策能力、决策效率和决策质量,最大限度减少或避免决策失误。

关键词：运行班组集体决策自动诊断人机组队偏差纠正

核电站MSR疏水闪蒸引起的非预期跳机风险分析研究

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核科学与工程 2019年第4期39卷 575-580页

作者：徐志辉中广核工程有限公司

核电机组在甩负荷工况下,汽水分离再热器开关量高液位触点会因闪蒸而产生虚假信号,存在误触发跳机保护风险.通过深入分析闪蒸原理及跳机逻辑,挖掘潜在的机组非预期跳机风险,并结合设备布置结构、系统运行原理、关联调节阀控制以及跳机... 详细信息

核电机组在甩负荷工况下,汽水分离再热器开关量高液位触点会因闪蒸而产生虚假信号,存在误触发跳机保护风险.通过深入分析闪蒸原理及跳机逻辑,挖掘潜在的机组非预期跳机风险,并结合设备布置结构、系统运行原理、关联调节阀控制以及跳机保护需求等,提出两种优化改进方案,并对比分析其优缺点,实现既能避免原有的误动风险,又防止引入新的拒动风险.通过高功率平台下的瞬态试验对优化方案进行验证,结果表明,通过本次优化可有效消除潜在的跳机风险,在保护设备本身安全稳定运行的同时,也提高了核电站汽轮发电机组整体运行安全,对其他核电机组瞬态过程中疏水闪蒸风险防范也有很好的借鉴意义.

关键词：疏水闪蒸跳机保护