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Chemical characteristics and sources apportionment of volatile organic compounds in the primary urban area of Shijiazhuang,North China Plain

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Journal of Environmental Sciences 2025年第3期149卷 465-475页

作者： Xiao Zhang Junfeng Wang Jiangwei Zhao Junliang He Yali Lei Kai Meng RuiWei Xue Zhang Miaomiao Zhang Shuangying Ni Eleonora Aruffo College of geographical sciences and Environment Shijiazhuang UniversityShijiazhuang 050035China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Hebei Province Ecology Environmental Monitoring Center Shijiazhuang 050037China Key Lab of Geographic information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Hebei Provincial Institute of Meteorological Sciences Shijiazhuang 050021China Key Laboratory of Meteorology and Ecological Environment of Hebei Province Shijiazhuang 050021China Hebei Provincial Academy of Ecological Environmental Science Shijiazhuang 050037China department of Advanced Technologies in Medicine&Dentistry University“G.d’Annunzio”of Chieti-PescaraChieti 66100Italy Center for Advanced Studies and Technology-CAST Chieti 66100Italy

VOCs(Volatile organic compounds)exert a vital role in ozone and secondary organic aerosol production,necessitating investigations into their concentration,chemical characteristics,and source apportionment for the effective implementation of measures aimed at preventing and controlling atmospheric *** to October 2020,onlinemonitoringwas conducted in the main urban area of Shijiazhuang to collect data on VOCs and analyze their concentrations and ***,the PMF(positive matrix factorization)method was utilized to identify the VOCs *** indicated that the TVOCs(total VOCs)concentration was(96.7±63.4μg/m^3),with alkanes exhibiting the highest concentration of(36.1±26.4μg/m^3),followed by OVOCs(16.4±14.4μg/m^3).The key active components were alkenes and aromatics,among which xylene,propylene,toluene,propionaldehyde,acetaldehyde,ethylene,and styrene played crucial roles as reactive *** sources derived from PMF analysis encompassed vehicle emissions,solvent and coating sources,combustion sources,industrial emissions sources,as well as plant sources,the contribution of which were 37.80%,27.93%,16.57%,15.24%,and 2.46%,***,reducing vehicular exhaust emissions and encouraging neighboring industries to adopt low-volatile organic solvents and coatings should be prioritized to mitigate VOCs levels.

关键词： Volatile organic compounds Pollution characteristics Ozone formation potential OH radical loss rate Source apportionment

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Interactions between Components of Various Vector Solitons in Bose-Einstein Condensates

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Chinese Physics Letters 2009年第9期26卷 9-12页

作者：颜家壬潘留仙俞慧友敖胜美 department of Physics Hunan Normal University Changsha 410081 Departmemt of engineering Electronics and information Hunan University of International Economics Changsha 410205

We investigate the interactions between components of various vector solitons in Bos-Einstein condensates by means of the least action principle, and derive the effective potentials for different vector solitons, which indicate that the interactions are of short range, and may be repulsive or attractive decided by the different intra- and inter-species interactions in such a system. In the case of attraction, the two solitons will oscillate about and pass through each other around the equilibrium state. The comparison of analytical results with mumertical simulation is presented.

关键词： No English Keyword

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A data-efficient self-supervised deep learning model for design and characterization of nanophotonic structures

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Science China(Physics,Mechanics & Astronomy) 2020年第8期63卷 23-30页

作者： Wei Ma Yongmin Liu College of information Science and Electronic engineering Zhejiang UniversityHangzhou 310027China department of Mechanical and industrial engineering Northeastern UniversityMassachusetts 02115USA department of Electrical and Computer engineering Northeastern UniversityMassachusetts 02115USA

With its tremendous success in many machine learning and pattern recognition tasks,deep learning,as one type of data-driven models,has also led to many breakthroughs in other disciplines including physics,chemistry and material ***,the supremacy of deep learning over conventional optimization approaches heavily depends on the huge amount of data collected in advance to train the model,which is a common bottleneck of such a data-driven *** this work,we present a comprehensive deep learning model for the design and characterization of nanophotonic structures,where a self-supervised learning mechanism is introduced to alleviate the burden of data *** reflective metasurfaces as an example,we demonstrate that the self-supervised deep learning model can effectively utilize randomly generated unlabeled data during training,with the total test loss and prediction accuracy improved by about 15%compared with the fully supervised *** proposed self-supervised learning scheme provides an efficient solution for deep learning models in some physics-related tasks where labeled data are limited or expensive to collect.

关键词： nanophotonics metasurfaces self-supervised deep learning

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CONTROLLING INFECTIOUS DISEASE OUTBREAKS： A DETERMINISTIC ALLOCATION-SCHEDULING MODEL WITH MULTIPLE DISCRETE RESOURCES

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Journal of Systems Science and Systems engineering 2017年第2期26卷 219-239页

作者： Nikolaos Rachaniotis Thomas K. Dasaklis Costas Pappis department of economics Democritus University of Thrace Komotini Greece department of industrial Management and Technology University of Piraeus Piraeus Greece

Infectious disease outbreaks occurred many times in the past and are more likely to happen in the future. In this paper the problem of allocating and scheduling limited multiple, identical or non-identical, resources employed in parallel, when there are several infected areas, is considered. A heuristic algorithm, based on Shih＇s （1974） and Pappis and Rachaniotis＇（2010） algorithms, is proposed as the solution methodology. A numerical example implementing the proposed methodology in the context of a specific disease outbreak, namely influenza, is presented. The proposed methodology could be of significant value to those drafting contingency plans and healthcare policy agendas.

关键词： Resource allocation healthcare management epidemics heuristics

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A Marcinkiewicz criterion for L^(p)-multipliers related to Schrodinger operators with constant magnetic fields

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Science China Mathematics 2015年第2期58卷 389-404页

作者： DENG Liu Rui MA Bo Lin LIU Shao Yue College of economics and Management Hunan Normal University College of Mathematics and information engineering Jiaxing University department of Mathematics Xiangtan University

In this paper,we follow Dappa’s work to establish the Marcinkiewicz criterion for the spectral multipliers related to the Schrdinger operator with a constant magnetic *** prove that if m and m′are locally absolutely continuous on(0,∞)and ‖m‖∞+sup j∈Z2j 2i+1 r|m′′(r)|dr<∞,then the multiplier defined by m(t)is bounded on Lpfor 2n/(n+3)

关键词： magnetic Schrodinger operator spectral multiplier Riesz means

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Hopf bifurcation and chaos in an inertial neuron system with coupled delay

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Science China(Technological Sciences) 2013年第9期56卷 2299-2309页

作者： GE JuHong XU Jian department of Mathematics and information Science He'nan University of Economics and Law School of Aerospace engineering and Applied Mechanics Tongji University

In this paper, inertia is added to a simplified neuron system with time delay. The stability of the trivial equilibrium of the net- work is analyzed and the condition for the existence of Hopf bifurcation is obtained by discussing the associated characteristic equation. Hopf bifurcation is investigated by using the perturbation scheme without the norm form theory and the center man- ifold theorem. Numerical simulations are performed to validate the theoretical results and chaotic behaviors are observed. Phase plots, time history plots, power spectra, and Poincar6 section are presented to confirm the chaoticity. To the best of our knowledge, the chaotic behavior in this paper is new to the previously published works.

关键词： time delay inertia Hopf bifurcation chaos

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Analysis of Phase Transition in Traffic Flow based on a New Model of Driving Decision

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Communications in Theoretical Physics 2011年第7期56卷 177-183页

作者：彭愚尚华艳陆化普 Programming Development department Shougang Corporation information College Capital University of Economics and Business Institute of Transportation engineering Tsinghua University

Different driving decisions will cause different processes of phase transition in traffic flow. To reveal the inner mechanism, this paper built a new cellular automaton （CA） model, based on the driving decision （DD）. In the DD model, a driver＇s decision is divided into three stages： decision-making, action, and result. The acceleration is taken as a decision variable and three core factors, i.e. distance between adjacent vehicles, their own velocity, and the preceding vehicle＇s velocity, are considered. Simulation results show that the DD model can simulate the synchronized flow effectively and describe the phase transition in traffic flow well. Further analyses illustrate that various density will cause the phase transition and the random probability will impact the process. Compared with the traditional NaSch model, the DD model considered the preceding vehicle＇s velocity, the deceleration limitation, and a safe distance, so it can depict closer to the driver preferences on pursuing safety, stability and fuel-saving and has strong theoretical innovation for future studies.

关键词： driving decision cellular automaton phase transition traffic flow

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Control-Response Compatibility: Fuzzy Clustering Analysis and a Comparison Among Populations of Different Regions

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Tsinghua Science and Technology 2004年第6期9卷 635-642页

作者：于瑞峰王永县陈海寿彭海 department of industrial engineering Tsinghua University Beijing 100084 ChinaSchool of Economics and Management Tsinghua University Beijing 100084 China School of economics and Management Tsinghua University Beijing 100084 China department of Manufacturing engineering and engineering Management City University of Hong Kong Hong Kong China department of industrial engineering Tsinghua University Beijing 100084 China

A group of 96 Mainland Chinese subjects were asked to respond to 12 questions by indicating their expectations about operation, direction-of-motion, and description of movement for items such as doors, keys, taps, and switches. Strong response preferences were found for the whole questionnaire. Fuzzy clustering was used to analyze the structure and characteristics of Mainland Chinese stereotypes. The results for Mainland Chinese subjects were compared with those for Hong Kong Chinese and Americans reported earlier. There are no significant differences for the population stereotypes for daily operational tasks in the three regions. The responses of the Hong Kong Chinese and Mainland Chinese are similar, but with significant variations between different populations, especially for some specific items in the questionnaire.

关键词： Chinese stereotypes questionnaire fuzzy clustering

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(r,QI)-Transform：Reversible Data Anonymity Based on Numeric Type of Data in Outsourced Database

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Journal of Electronic Science and Technology 2017年第3期15卷 222-230页

作者： Iuon-Chang Lin Yang-Te Lee Chen-Yang Cheng the department of Management information Systems Chung Hsing University the department of Photonics and Communication engineering Asia University Taichung 400 department of industrial engineering and Management Taipei University of Technology Taipei 10608

An outsource database is a database service provided by cloud computing *** the outsource database can reduce the hardware and software＇s cost and also get more efficient and reliable data processing ***,the outsource database still has some *** the service provider does not have sufficient confidence,there is the possibility of data *** data may has user＇s privacy,so data leakage may cause data privacy *** on this factor,to protect the privacy of data in the outsource database becomes very *** the past,scholars have proposed k-anonymity to protect data privacy in the *** lets data become anonymous to avoid data privacy *** k-anonymity has some problems,it is irreversible,and easier to be attacked by homogeneity attack and background knowledge *** on,scholars have proposed some studies to solve homogeneity attack and background knowledge *** their studies still cannot recover back to the original *** this paper,we propose a data anonymity *** can be reversible and also prevent those two *** study is based on the proposed *** can be used on the numeric type of attributes in the outsource *** the experiment,we discussed the time required to anonymize and recover ***,we investigated the defense against homogeneous attack and background knowledge *** the end,we summarized the proposed method and future researches.

关键词： Index Terms--Cloud database data anonymity,database privacy outsource database reversible

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A novel multi-modal tactile sensor design using thermochromic material

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Science China(information Sciences) 2019年第11期62卷 189-191页

作者： Fuchun SUN Bin FANG Hongxiang XUE Huaping LIU Haiming HUANG department of Computer Science and Technology Tsinghua University Key Lab of industrial Computer Control engineering of Hebei Province Yanshan University College of information engineering Shenzhen University

Tactile sensors are important for ensuring robotic perception [1], and their performance directly affects a robot’s capability for performing dexterous operations. These sensors mimic the tactile sensing capability of human hands. This is because the skin of human hands is involved in considerably meticulous works and can provide multi-

关键词： A novel multi-modal tactile sensor design using thermochromic material

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