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The main strategies for soil pollution apportionment:A review of the numerical methods

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Journal of Environmental Sciences 2024年第2期136卷 95-109页

作者： Bin Shi Jing Meng TieyuWang Qianqian Li qifan Zhang Guijin Su Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention Shantou UniversityShantou 515063China

Nowadays,a large number of compounds with different physical and chemical properties have been determined in *** behaviors and source identification of pollutants in soil are the foundation of soil pollution *** and quantitative analysis of potential pollution sources are the prerequisites for its prevention and *** efforts have made to develop methods for identifying the sources of soil *** efforts have involved the measurement of source and receptor parameters and the analysis of their relationships via numerical statistics *** have comprehensively reviewed the progress made in the development of source apportionment methodologies to date and present our *** numerical methods,such as spatial geostatistics analysis,receptor models,and machine learning methods are addressed in *** most cases,however,the effectiveness of any single approach for source apportionment remains *** multiple methods to address soil quality problems can reduce uncertainty about the sources of soil *** review also constructively highlights the key strategies of combining mathematical models with the assessment of chemical profiles to provide more accurate source *** review intends to provide a comprehensive summary of source apportionment methodologies to help promote further development.

关键词： Soil pollutants Source attribution Methodologies Chemical profiles Mathematical models

Enhanced Recognition Algorithm for Facial Expressions under Deflection Angles

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Enhanced Recognition Algorithm for Facial Expressions under ...

A Method of Experimental Investigation into the Double-bundle Transmission Line Conglutination

第40届中国控制会议

作者： Yanru Liu qifan yang Wei Xie School of Automation Science and Engineering South China University of Technology

Facial expression recognition technology is significant to psychological analysis, polygraph technology, clinical medicine, and safe driving. However, traditional facial expression recognition technologies mainly recognize frontal facial expressions, and few studies focus on the recognition of facial expressions under deflection angles. In this situation, this paper combines Adaboost cascaded detectors, Ensemble of Regression Trees algorithm, and Random Forest algorithm to recognize facial expressions under deflection angles. After detecting faces by Adaboost cascaded detectors, the facial expression features under deflection angles are extracted by the Ensemble of Regression Trees algorithm. Finally, the Random Forest algorithm is used to output the recognition results based on expression features. Experiments show that the enhanced facial expression recognition algorithm proposed in this paper realizes the recognition of non-frontal facial expressions, and it has good real-time performance and recognition accuracy.

关键词： Enhanced recognition Expressions Deflection angle ERT

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A Method of Experimental Investigation into the Double-bundl...

Multi-Time Scale Optimal Scheduling of a Photovoltaic Energy Storage Building System Based on Model Predictive Control

2012 International Conference on Power Electronics Engineering and Computer Technology(PEECT 2012)

作者： Biao Zhang Rui Wen qifan yang Wenjun Zhou School of Electrical Engineering of Wuhan University School of Physics and Technology of Wuhan University

A method to produce heavy current of experimental investigation into the double-bundle transmission line conglutination is introduced in this paper. The conglutination problem is studied through high-voltage and heavy-current experiments. The loop parameters such as resistance and inductance are calculated in the paper. The output current is continuously adjustable by voltage regulator and power current transformer. And the test circuit is compensated by capacitor in series.

关键词： Transmission line High-voltage techniques Equivalent circuits Series compensation capacitor

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Energy Engineering 2024年第4期121卷 1067-1089页

作者： Ximin Cao Xinglong Chen He Huang Yanchi Zhang qifan Huang School of Electrical Engineering Shanghai DianJi UniversityShanghai201306China

Building emission reduction is an important way to achieve China’s carbon peaking and carbon neutrality *** at the problem of low carbon economic operation of a photovoltaic energy storage building system,a multi-time scale optimal scheduling strategy based on model predictive control(MPC)is proposed under the consideration of load ***,load optimization is achieved by controlling the charging time of electric vehicles as well as adjusting the air conditioning operation temperature,and the photovoltaic energy storage building system model is constructed to propose a day-ahead scheduling strategy with the lowest daily operation ***,considering inter-day to intra-day source-load prediction error,an intraday rolling optimal scheduling strategy based on MPC is proposed that dynamically corrects the day-ahead dispatch results to stabilize system power fluctuations and promote photovoltaic ***,taking an office building on a summer work day as an example,the effectiveness of the proposed scheduling strategy is *** results of the example show that the strategy reduces the total operating cost of the photovoltaic energy storage building system by 17.11%,improves the carbon emission reduction by 7.99%,and the photovoltaic consumption rate reaches 98.57%,improving the system’s low-carbon and economic performance.

关键词： Load optimization model predictive control multi-time scale optimal scheduling photovoltaic consumption photovoltaic energy storage building

Research on the navigational risk of liquefied natural gas carriers in an inland river based on entropy:A cloud evaluation model

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Transportation Safety and Environment 2024年第2期6卷 13-23页

作者： Chengyong Liu Shijie Li Shuzhe Chen qifan Chen Kang Liu School of Navigation Wuhan University of TechnologyWuhan 430063HubeiChina Hubei Key Laboratory of Inland Shipping Technology Wuhan 430063HubeiChina

Due to the flammability and explosive nature of liquefied natural gas(LNG),an extremely strict process is followed for the transporta-tion of LNG carriers in ***,no LNG carriers are operating in inland rivers within the ***,to ensure the future navigation safety of LNG carriers entering the yangtze River,the risk sources of LNG carriers’navigation safety must be identi-fied and *** on the Delphi and expert experience method,this paper analyses and discusses the navigation risk factors of LNG carriers in the lower reaches of the yangtze River from four aspects(human,ship,environment and management),identifies 12 risk indicators affecting the navigation of LNG carriers and establishes a risk evaluation index ***,an entropy weight fuzzy model is utilized to reduce the influence of subjective judgement on the index weight as well as to conduct a segmented and overall evaluation of LNG navigation risks in the Baimaosha ***,the cloud model is applied to validate the consistent feasibility of the entropy weight fuzzy *** research results indicate that the method provides effective technical support for further study on the navigation security of LNG carriers in inland rivers.

关键词： liquefied natural gas(LNG)carrier navigation risk entropy weight cloud model risk assessment

Source apportionment and suitability evaluation of seasonal VOCs contaminants in the soil around a typical refining-chemical integration park in China

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Journal of Environmental Sciences 2024年第3期137卷 651-663页

作者： Xu Zhao Jing Meng Qianqian Li Guijin Su qifan Zhang Bin Shi Lingwen Dai Yong Yu Key Laboratory of Environmental Nanotechnology and Health Effects State Key Laboratory of Environmental Chemistry and EcotoxicologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring China National Environmental Monitoring CenterBeijing 100012China

Accurate source apportionment of volatile organic compounds(VOCs)in soil nearby petrochemical industries prevailing globally,is critical for preventing ***,in the process,seasonal effect on contamination pathways and accumulation of soil VOCs is often ***,Yanshan Refining-Chemical Integration Park,including a carpet,refining,synthetic rubber,and two synthetic resin zones,was selected for *** variations resulted in a gradual decrease of 31 VOCs in soil from winter to summer.A method of dry deposition resistance model coupling partitioning coefficient model was created,revealing that dry deposition by gas phase was the primary pathway for VOCs to enter soil in winter and spring,with 100 times higher fux than by particle *** profiles for five zones were built by gas sampling with distinct substance indicators screened,which were used for positive matrix factorization factors *** of the five zones were 14.9%,20.8%,13.6%,22.1%,and 28.6%in winter and 33.4%,12.5%,10.7%,24.9%,and 18.5%in spring,*** variation in the soil sorption capacity of VOCs causes inter-seasonal differences in *** better correlation between dry deposition capacity and soil storage of VOCs made root mean square and mean absolute errors decrease averagely by 8.8%and 5.5%in winter compared to *** study provides new perspectives and methods for the source apportionment of soil VOCs contamination in industrial sites.

关键词： Dry deposition resistance model Positive matrix factorization model Partitioning coefficient model Contamination pathway Source profile

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我国公共卫生领域面临的突出生物安全问题

中国公共卫生 2023年第5期39卷 676-680页

作者：杨启凡王宇萍中国医学科学院北京协和医学院群医学及公共卫生学院北京100730

2020年10月17日,我国正式通过了《中华人民共和国生物安全法》,将生物安全列为国家安全的重要组成部分,明确了生物安全的重要地位。在新冠病毒感染疫情背景下,公共卫生领域发展广受重视。本文通过阐述生物安全与公共卫生的范畴,从新发... 详细信息

2020年10月17日,我国正式通过了《中华人民共和国生物安全法》,将生物安全列为国家安全的重要组成部分,明确了生物安全的重要地位。在新冠病毒感染疫情背景下,公共卫生领域发展广受重视。本文通过阐述生物安全与公共卫生的范畴,从新发突发传染病疫情、实验室生物安全和微生物耐药等方面,对当前我国公共卫生领域面临的生物安全风险进行综述,为促进我国公共卫生事业提供生物安全的参考视角。

关键词：公共卫生生物安全新发突发传染病实验室生物安全微生物耐药

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预知工件大小上界的平行机排序问题

系统科学与数学 2010年第4期30卷 441-448页

作者：吴用杨启帆浙江大学宁波理工学院基础部宁波315000 浙江大学数学系杭州310027

平行机排序问题广泛出现并应用于各领域,如通讯网信道分配的负载均衡,大型计算中的并行计算,柔性制造系统的任务编排等等.研究了预知工件大小上界的半在线平行机排序问题.考察了仅预知工件大小上界和既预知工件大小上界又预知最优目标... 详细信息

平行机排序问题广泛出现并应用于各领域,如通讯网信道分配的负载均衡,大型计算中的并行计算,柔性制造系统的任务编排等等.研究了预知工件大小上界的半在线平行机排序问题.考察了仅预知工件大小上界和既预知工件大小上界又预知最优目标值的两类半在线模型.基于资源分配公平性和提高服务质量的考虑,针对每类模型都分别考察了两个目标:C_(max)(极小化机器最大负载makespan)和C_(min)(极大化机器最小负载).在不同的目标下,针对m台平行机的一般情况均给出了问题的下界并设计了半在线算法,某些情况下设计的算法是最优算法.

关键词：排序半在线算法设计与分析竞争比

基于卷积自编码与密集时间卷积网络的回转支承退化趋势预测

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振动与冲击 2021年第23期40卷 9-16页

作者：张典震陈捷王华杨启帆南京工业大学机械与动力工程学院南京211816 南京工业大学江苏省工业装备数字制造及控制技术重点实验室南京211816

为了对反映回转支承性能退化状况的健康指标进行准确预测,提出了一种基于改进时间卷积网络(temporal convolution network,TCN)的退化趋势预测模型——密集时间卷积网络(densely temporal convolution network,DTCN)。该模型借鉴Dense-... 详细信息

为了对反映回转支承性能退化状况的健康指标进行准确预测,提出了一种基于改进时间卷积网络(temporal convolution network,TCN)的退化趋势预测模型——密集时间卷积网络(densely temporal convolution network,DTCN)。该模型借鉴Dense-Net网络中的Dense-block模块对网络结构进行改进,以解决时间卷积网络在训练中损失函数下降缓慢,以及网络不易收敛、收敛效果差的问题;使用回转支承全寿命试验数据,借助卷积自编码网络(convolutional auto-encoders,CAE)与隐马尔可夫模型(hidden Markov model,HMM)建立健康指标,验证该改进算法的有效性;将DTCN与其他序列预测模型如长短时记忆网络(long short-term memory,LSTM)、门控循环单元网络(gated recurrent unit,GRU)等对比。结果表明,该模型在预测效果上具有优越性,能够更准确地预测健康指标的变化情况,可用于回转支承的退化趋势预测任务。

关键词：回转支承密集时间卷积网络(DTCN) 卷积自编码网络(CAE) 退化趋势预测