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Inverse uncertainty characteristics of pollution source identification for river chemical spill incidents by stochastic analysis

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Frontiers of Environmental Science & Engineering 2018年第5期12卷 115-130页

作者： Jiping Jiang Feng Han Yi Zheng nannan wang Yixing Yuan School of Environment Harbin Institute of TechnologyHarbin 150090China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 581055China School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China

Identifying source information after river chemical spill occurrences is critical for emergency ***,the inverse uncertainty characteristics of this kind of pollution source inversion problem have not yet been clearly *** fill this gap,stochastic analysis approaches,including a regional sensitivity analysis method,identifiability plot and perturbation methods,were employed to conduct an empirical investigation on generic inverse uncertainty characteristics under a well-accepted uncertainty analysis *** studies based on field tracer experiments and synthetic numerical tracer experiments revealed several new *** example,the release load can be most easily inverted,and the source location is responsible for the largest uncertainty among the source *** diffusion and convection processes are more sensitive than the dilution and pollutant attenuation processes to the optimization of objective functions in terms of structural *** differences among the different objective functions are smaller for instantaneous release than for continuous release *** monitoring errors affect the inversion results only slightly,which can be ignored in ***,the estimated values of the release location and time negatively deviate from the real values,and the extent is positively correlated with the relative size of the mixing zone to the objective river *** new findings improve decision making in emergency responses to sudden water pollution and guide the monitoring network design.

关键词： River chemical spills Emergency response Pollution source inversion Inverse uncertainty analysis Regional Sensitivity Analysis method(RSA) Monte Carlo analysis toolbox(MCAT)

Uncovering the miRNA-mediated regulatory network involved in Ma bamboo(Dendrocalamus latiflorus)de novo shoot organogenesis

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Horticulture Research 2023年第12期10卷 1-13页

作者： nannan wang Wenjia wang Yang Cheng Changyang Cai Qiang Zhu Basic Forestry and Proteomics Center(BFPC) College of ForestryHaiXia Institute for Science and TechnologyFujian Agriculture and Forestry UniversityFuzhou 350002China

Bamboo is an important non-timber forest product and is well-known for its reluctance to *** we have established a de novo shoot organogenesis(DNSO)protocol in Ma bamboo(Dendrocalamus latiflorus)and revealed the transcriptomic dynamics during Ma bamboo regeneration,which suggested the potential roles of Ma bamboo microRNAs(DlamiRNAs)in this ***,how DlamiRNAs regulate bamboo DNSO is poorly *** we performed integrated analysis with sRNAome,degradome,and transcriptome sequencing by using samples covering the four stages of the bamboo DNSO process.A total of 727 DlamiRNAs showed differential expression during the bamboo DNSO process,and the core DlamiRNA-DlamRNA-mediated regulatory networks for bamboo DNSO were *** on the results,DlamiR156 was selected for further functional characterization of its potential roles in bamboo *** bamboos with increased DlamiR156 levels exhibited an enhancement in their regeneration ***,when DlamiR156 levels were downregulated,the regeneration efficiencies of transgenic bamboos *** findings show that the DlamiRNA-mediated regulatory pathways are significant in the process of bamboo regeneration and will contribute to our understanding of the molecular mechanisms governing plant organogenesis in a more comprehensive manner.

关键词： bamboo Bamboo covering

Risk Analysis Using Multi-Source Data for Distribution Networks Facing Extreme Natural Disasters

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Energy Engineering 2023年第9期120卷 2079-2096页

作者： Jun Yang nannan wang Jiang wang Yashuai Luo School of Information Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China

Distribution networks denote important public infrastructure necessary for people’s ***,extreme natural disasters,such as earthquakes,typhoons,and mudslides,severely threaten the safe and stable operation of distribution networks and power supplies needed for daily ***,considering the requirements for distribution network disaster prevention and mitigation,there is an urgent need for in-depth research on risk assessment methods of distribution networks under extreme natural disaster *** paper accessesmultisource data,presents the data quality improvement methods of distribution networks,and conducts data-driven active fault diagnosis and disaster damage analysis and evaluation using data-driven ***,the paper realizes real-time,accurate access to distribution network disaster *** proposed approach performs an accurate and rapid assessment of cross-sectional risk through case *** minimal average annual outage time can be reduced to 3 h/a in the ring network through case *** approach proposed in this paper can provide technical support to the further improvement of the ability of distribution networks to cope with extreme natural disasters.

关键词： Distribution network disaster damage analysis fault judgment multi-source data

Pyramid-resolution person restoration for cross-resolution person re-identification

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Science China(Information Sciences) 2024年第6期67卷 451-452页

作者： Chunlei PENG Bo wang Decheng LIU nannan wang Xinbo GAO State Key Laboratory of Integrated Services Networks Xidian University School of Cyber Engineering Xidian University School of Telecommunications Engineering Xidian University Chongqing Key Laboratory of Image Cognition Chongqing University of Posts and Telecommunications

Person images captured by surveillance cameras are typically with various resolutions and are susceptible to pose changes,occlusion and background variations,thus affecting the performance of person Re *** approaches[1,2]either use an image restoration model to restore the lowresolution images to obtain a corresponding high-resolution image,

关键词： Restoration

BiTGAN: bilateral generative adversarial networks for Chinese ink wash painting style transfer

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Science China(Information Sciences) 2023年第1期66卷 322-323页

作者： Xiao HE Mingrui ZHU nannan wang Xiaoyu wang Xinbo GAO State Key Laboratory of Integrated Services Networks Xidian University The Chinese University of Hong Kong (Shenzhen) Chongqing Key Laboratory of Image Cognition Chongqing University of Posts and Telecommunications

Dear editor,Chinese ink wash painting occupies a pivotal position in Chinese traditional painting and has high artistic value. It is meaningful to design a special automatic algorithm for Chinese ink wash painting style transfer. In existing algorithms, there are two types of methods that can achieve this goal. One is the image style transfer method,

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Vegetation stability during the last two centuries on the western Tibetan Plateau:a palynological evidence

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Frontiers of Earth Science 2023年第4期17卷 1049-1058页

作者： Yanrong ZHANG nannan wang Lina LIU Mingda wang Xiaoshan YU Xianyong CAO Alpine Paleoecology and Human Adaptation Group(ALPHA) State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Science Beijing 100049China School of Geography Liaoning Normal UniversityDalian 116029China

Investigating the dynamics of vegetation is an essential basis to know how to protect ecological environments and to help predict any changes in *** of its fragile alpine ecosystem,the Tibetan Plateau is a particularly suitable area for studying vegetation changes and their driving *** this study,we present a high-resolution pollen record covering the last two centuries extracted from Gongzhu Co on the western Tibetan *** steppe is the predominant vegetation type in the surrounding area throughout the past 250 years with stable vegetation composition and abundance,as revealed by pollen spectra dominated by Artemisia,Ranunculaceae,Cyperaceae,and *** canonical correspondence analysis(DCCA)of the pollen data reveals low turnover in compositional species(0.41 SD),suggesting that the vegetation in the Gongzhu catchment had no significant temporal change,despite climate change and population increases in recent *** additionally ran DCCA on ten other pollen records from the Tibetan Plateau with high temporal resolution(1-20 years)covering recent centuries,and the results also show that compositional species turnover(0.15-0.81 SD)is relatively low,suggesting that the vegetation stability may have prevailed across the Tibetan Plateau during recent *** high-resolution pollen records and high taxonomic-resolution palaeo-vegetation records(such as sedaDNA),however,are needed to confirm the vegetation stability on the Tibetan Plateau.

关键词： pollen compositional 1species turnover vegetation change ecological stability

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Jump rule for edge impacts of rolling prisms

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Theoretical & Applied Mechanics Letters 2018年第6期8卷 425-430,I0006页

作者： Zhen Zhao nannan wang Caishan Liu School of Aeronautic Science and Engineering Beihang University State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University

We study experimentally and theoretically the planar dynamics of purely rolling prisms on a rough ramp, where the rolling motion is interrupted intermittently by edge impacts. The experiments were carried out for prisms made of different materials and having different geometries. We found that the angular velocities of the rolling prisms are material-independent, but they change significantly with their geometry. We modelled the dynamics of edge impacts by considering a socalled detachment front propagating across the contact interface. The detachment front represents the moving boundary between a detached region and a stress region that coexist within the interface plane. The theoretical analysis indicates that the detachment front can be characterized by a scale number, whose value converges to 0.4050 for prisms having large number of edges. A new jump rule for edge impacts is then developed, by which we can accurately reproduce the experimental observations, and explain why the motion of the prism is material-independent.

关键词： Surface impact Jump rule Experiments

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Ternary layered boride MoAlB:A novel thermo-regulation microwave absorbing ceramic material

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Journal of Advanced Ceramics 2024年第5期13卷 699-710页

作者： Zhangjue wang Fan Zhang nannan wang Wei Li Yongqiang Chen Hailong wang Rui Zhang Yanqiu Zhu Bingbing Fan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Academy of Sciences Zhengzhou 450046China State Key Laboratory of Featured Metal Materials and Life Cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Department of Engineering Faculty of EnvironmentScience and EconomyUniversity of ExeterExeter EX44QFUK

In the context of the fifth-generation(5G)smart era,the demand for electromagnetic wave(EMW)-absorbing materials has become increasingly prominent,so it is necessary to explore promising candidate *** work focuses on the exploration of the material absorbing properties of a MoAlB MAB(MAB represents a promising group of alternatives,where M stands for a transition metal,A typically denotes Al,and B is boron)phase ***,the first-principles calculations were performed to reveal the unique crystal and layered structure of the MoAlB ceramics and to predict their potential for use as an EMW absorption ***,a series of MoAlB ceramics were synthesized at temperatures ranging from 800 to 1300℃,and the influence of temperature on the phase compositions and microstructures of the obtained MoAlB ceramics was characterized and ***,the practical EMW absorption performance of the prepared MoAlB ceramics was evaluated via a combination of experiments and radar cross-sectional *** MoAlB sample synthesized at 900℃ exhibits superior EMW absorption performance,achieving an impressive minimum reflection loss(RL)of−50.33 *** unique layered structure and good electrical conductivity of the MoAlB samples are the main reasons for their enhanced wave absorption performance,which provides interfacial polarization and multiple dielectric loss ***,this study not only contributes to the understanding of the preparation of MoAlB materials but also provides potential guidance for their utilization in the realm of electromagnetic wave absorption.

关键词： MoAlB electronic band structure electromagnetic wave(EMW)absorption layered ternary boride density of states

Spatial distribution of charcoal in topsoil and its potential determinants on the Tibetan Plateau

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Frontiers of Earth Science 2023年第4期17卷 1059-1069页

作者： Yixuan wang Chaoqun CAO Yanrong ZHANG Lina LIU nannan wang Wenjia LI Xianyong CAO Alpine Paleoecology and Human Adaptation Group(ALPHA) State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of the Chinese Academy of Sciences Beijing 100049China College of Life Sciences Zhejiang Normal UniversityJinhua 321004China

As an important proxy for investigating past fire activities,charcoal is often used to explore the characteristics of fire distribution and its relationships with vegetation,climate,and human *** into the spatial distribution and environmental determinants for charcoal,however,is still *** this study,we identified and counted charcoal from topsoil samples covering the Tibetan Plateau using the pollen methodology,and investigated its relationships with vegetation net primary production(NPP),elevation,climate(precipitation,mean temperature of the coldest month and warmest month)and human population by boosted regression trees(BRT).Results reveal that the concentration of microscopic charcoal,macroscopic charcoal,and total charcoal all increase from south-west to north-east,which is consistent with the trend that the population density on the Tibetan Plateau is high in the east and low in the west,suggesting that an increase in human activity is likely to promote the occurrence of *** BRT modeling reveals that NPP,elevation,and mean temperature of the coldest month are important factors for total charcoal concentration on the Tibetan Plateau,and the frequency and intensity of fires further increase with increasing vegetation biomass,decreasing elevation,and decreasing mean temperature of the coldest *** spatial variation characteristics of charcoal from topsoil on the Tibetan Plateau not only reflect well the spatial fire situation in the region,but also have a good indicative significance for vegetation,climate,and human activities.

关键词： BRT charcoal fire regime climate vegetation human activities

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