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Generative adversarial networks for detecting contamination events in water distribution systems using multi-parameter,multi-site water quality monitoring

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Environmental Science and Ecotechnology 2023年第2期14卷 39-52页

作者： zilin li Haixing liu Chi Zhang Guangtao Fu School of Hydraulic Engineering Dalian University of TechnologyDalianLiaoning116024China Centre for Water Systems University of ExeterExeterEX44QFUK

Contamination events in water distribution networks(WDNs)can have a huge impact on water supply and public health;increasingly,online water quality sensors are deployed for real-time detection of contamination *** learning has been used to integrate multivariate time series water quality data at multiple stations for contamination detection;however,accurate extraction of spatial features in water quality signals remains *** study proposed a contamination detection method based on generative adversarial networks(GANs).The GAN model was constructed to simultaneously consider the spatial correlation between sensor locations and temporal information of water quality *** model consists of two networksda generator and a discriminatordthe outputs of which are used to measure the degree of abnormality of water quality data at each time step,referred to as the anomaly *** sequential analysis is used to update the likelihood of event occurrence based on the anomaly *** are then generated from the fusion of single-site and multi-site *** proposed method was tested on a WDN for various contamination events with different *** showed high detection performance by the proposed GAN method compared with the minimum volume ellipsoid benchmark method for various contamination ***,the GAN method achieved high accuracy for various contamination events with different amplitudes and numbers of anomalous water quality parameters,and water quality data from different sensor stations,highlighting its robustness and potential for practical application to real-time contamination events.

关键词： Contamination detection Generative adversarial network Multi-site time series data Water distribution system Water quality

Enhancement of tribological properties in siliconized graphite via hierarchically hybrid SiC/C composite

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Progress in Natural Science:Materials International 2021年第2期31卷 255-263页

作者： zilin li Zhaowei Zhu Xianglong Yu Kai li Zixi Wang Zezhao Zhang Yuming Wang State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua University Institute of Chemical Defense Academy of Military Sciences

This study aims to investigate tribological properties in a siliconized graphite(СГ-П-0.5) and hierarchically hybrid Si C/C composites at the load ranging from 10-40 N under dry air/water lubrication conditions. A feasible liquid silicon infiltration(LSI) was used to fabricate the Si C/C composites. Morphology and phase identification of two materials were characterized and analyzed by scanning electron microscope(SEM) and energy dispersive spectrometer(EDS). An image feature extraction was used to post-process the data of wear test, further to gain the wear properties of the samples. The results demonstrated that a lower coefficient of friction(COF) and wear rate can be achieved in the LSI Si C composites than that in the sample of СГ-П-0.5. Both COF decreased under waterlubricated conditions, compared with that under the dry air lubrication. The excellent tribological properties in two materials can be due mainly to the microstructure of the СГ-П-0.5 sample, showing much more graphite and Si dispersed on the matrix. The СГ-П-0.5 sample indicated the typical oxidative wear mechanism, whereas, the sample of LSI Si C demonstrated the combined oxidative and fatigue wear. This finding can provide a promising new siliconized graphite materials for ceramic rolling bearings.

关键词： Siliconized graphite Coefficient of friction Surface microstructure Feature extraction

Dynamic reconfiguration for TEG systems under heterogeneous temperature distribution via adaptive coordinated seeker

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Protection and Control of Modern Power Systems 2022年第1期7卷 567-585页

作者： Yijun Chen Bo Yang Zhengxun Guo Jingbo Wang Mengmeng Zhu zilin li Tao Yu Faculty of Electric Power Engineering Kunming University of Science and TechnologyKunming 650500China Electric Power Research Institute of Yunnan Power Grid Co. LtdKunming 650217China Department of Elec-trical Engineering Hong Kong Polytechnic UniversityKowloon 999077Hong Kong SARChina College of Electric Power South China University of Tech-nologyGuangzhou 510640China.

A thermoelectric generation(TEG)system has the weakness of relatively low thermoelectric conversion efficiency caused by heterogeneous temperature distribution(HgTD).Dynamic reconfiguration is an effective technique to improve its overall energy efficiency under ***,numerous combinations of electrical switches make dynamic reconfiguration a complex combinatorial optimization *** paper aims to design a novel adaptive coordinated seeker(ACS)based on an optimal configuration strategy for large-scale TEG systems with series-paral-lel connected modules under *** properly balance global exploration and local exploitation,ACS is based on'divide-and-conquer'parallel computing,which synthetically coordinates the local searching capability of tabu search(TS)and the global searching capability of a pelican optimization algorithm(POA)during *** addition,an equivalent re-optimization strategy for a reconfiguration solution obtained by meta-heuristic algorithms(MhAs)is proposed to reduce redundant switching actions caused by the randomness of *** case studies are carried out to assess the feasibility and superiority of AcS in comparison with the artificial bee colony algorithm,ant colony optimization,genetic algorithm,particle swarm optimization,simulated annealing algorithm,TS,and *** results indicate that ACS can realize fast and stable dynamic reconfiguration of a TEG system under *** addition,RTLAB platform-based hardware-in-the-loop experiments are carried out to further validate the hardware implemen-tation feasibility.

关键词： Thermoelectric generation systems Dynamic reconfiguration Heterogeneous temperature distribution Adaptive coordinated seeker

Optimal dispatch of multi energy system using power-to-gas technology considering flexible load on user side

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Frontiers in Energy 2018年第4期12卷 569-581页

作者： Zi liNG Xiu YANG zilin li College of Electric Engineering Shanghai University of Electric PowerShanghai 200090China

The relation between power-to-gas technology (P2G) and energy interconnection becomes increasingly close. Meanwhile, the participation of flexible load on user side in system optimization has attracted much attention as an efficient approach to relieve the contradiction between energy supply and energy demand. Based on the concept of energy hub, according to its series characteristic, this paper established a generic multi-energy system model using the P2G technology. The characteristic of flexible load on user side was considered and optimal dispatch analysis was made, so as to reduce the cost, to reasonably dispatch the flexible load, to reduce the discharge, to enhance the new energy output, and to increase the power-to-gas conversion efficiency. Finally, a concrete analysis was made on the optimal dispatch result of the multi-energy system using the P2G technology considering flexible load on user side in the calculating example, and optimal dispatch of the system was verified via four different scenarios. The results indicate that cooperative dispatch of multi-energy system using the P2G technology considering flexible load on user side is the most economic, and can make a contribution to absorption of new energy and P2G conversion. In this way, environmental effects and safe and stable operation of the system can be guaranteed.

关键词： multi-energy system energy hub series characteristic optimal dispatch flexible load

Resolving controversies surrounding carbon sinks from carbonate weathering

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Science China Earth Sciences 2024年第9期67卷 2705-2717页

作者： Xiaoyong BAI Sirui ZHANG Pete SMITH Chaojun li lian XIONG Chaochao DU Yingying XUE zilin li Mingkang LONG Minghui li Xiaoyun ZHANG Shu YANG Qing LUO Xiaoqian SHEN State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China Institute of Biological and Environmental Sciences University of AberdeenAberdeen AB243UUUK College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China School of Geography and Environmental Sciences Guizhou Normal UniversityGuiyang 550025China CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China

The importance of carbonate weathering carbon sinks(CCSs)is almost equal to that of vegetation photosynthesis in the global carbon ***,CCSs have become controversial in formulating carbon neutral policies to deal with global climate problems in various countries,since the carbonate dissolution is *** order to address these controversies,we reviewed recent advances in understanding CCSs and examined the outstanding controversies surrounding *** have analyzed the five controversies,revealing the existence of CCSs,quantifying their magnitude,clarifying their spatiotemporal pattern,and documenting how they have increased and how they evolved under the background of global *** addressing these five controversies,we help to bring clarity to the role of CCSs in the carbon cycle of global terrestrial ecosystems.

关键词： Carbon sink Carbonate weathering Carbon cycle Climate change Anthropogenic driver

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Anti-fatigue activity of Brassica rapa *** and correlation among biochemical changes in forced swimming mice

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Food Bioscience 2022年第3期47卷 670-678页

作者： zilin li Hongkang Zhu Hanyi Hua Chang liu Yuliang Cheng Yahui Guo Peng Du He Qian State Key Laboratory of Food Science and Technology School of Food Science and TechnologyJiangnan UniversityWuxi214122China International Joint Laboratory on Food Safety Jiangnan UniversityWuxi214122China People's liberation Army Air Force PLABeijing100142China

Brassica rapa *** an edible and medical plant in China used for treating various diseases,especially in the Tibet *** this study,the chemical constituents of Brassica rapa ***(BE)was clarified by UHPLC-MS and anti-fatigue ability of BE was assessed through the behavior test and weight-loaded forced swimming test in *** we determined several biochemical parameters related to fatigue to explore possible *** indicate that BE could significantly enhance exercise performance in mice,and there was a significant improvement in both grip-strength and the time on ***,BE showed significant anti-fatigue effects by decreasing the blood lactic acid(BLA),blood urea nitrogen(BUN),and creatine kinase(CK)levels and increasing the lactate dehydrogenase(LDH)and malondialdehyde(MDA)*** in superoxide dismutase(SOD)and glutathione peroxidase(GSH-Px)were observed and reactive oxygen species(ROS)levels was *** and muscle glycogen levels and adenosine triphosphate(ATP)levels were also significantly *** correlation analysis indicates that fatigue-related indexes including metabolites and energy-related indexes were significantly correlated with antioxidant *** conclusion,BE possesses remarkable anti-fatigue activity,thereby shows great potential for improving exercise performance and alleviating physical fatigue and can be considered as a functional food supplement for further development.

关键词： Brassica rapa L. UHPLC-MS Anti-fatigue Behavioral experiment Energy metabolism

Novel gold nanoparticles targeting somatostatin receptor subtype two with near-infrared light for neuroendocrine tumour therapy

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Nano Research 2022年第10期15卷 9149-9159页

作者： Qichen Chen zilin li Jiangyuan Yu Qing Xie Haizhen Lu Yiqiao Deng Jinghua Chen Wenjia Zhu li Huo Yizhou Zhang Wei Song Jianqiang Lan Jianqiang Cai Zhen Huang Zixi Wang Hong Zhao Department of Hepatobiliary Surgery State Key Laboratory of Molecular OncologyNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Key Laboratory of Gene Editing Screening and R&D of Digestive System Tumor Drugs Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Department of Nuclear Medicine Key Laboratory of Carcinogenesis and Translational ResearchMinistry of EducationPeking University Cancer Hospital&InstituteBeijing 100142China Department of Pathology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeNo.17Panjiayuan NanliBeijing 100021China Nuclear Medicine Department State Key Laboratory of Complex Severe and Rare DiseasesCenter for Rare Diseases ResearchBeijing Key Laboratory of Molecular Targeted Diagnosis and Therapy in Nuclear MedicinePeking Union Medical College HospitalChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100005China Department of Biochemistry and Molecular Biology State Key Laboratory of Medical Molecular BiologyInstitute of Basic Medical Sciences Chinese Academy of Medical SciencesSchool of Basic MedicinePeking Union Medical CollegeBeijing 100005China Guangdong Research Center of Organoid Engineering and Technology Accurate International Biotechnology Co.Ltd.Guangzhou 510650China

Neuroendocrine tumours(NETs)are rare cancers with positive somatostatin receptor 2(SSTR2)expression,and treatment strategies for NETs are not ***-mediated therapy targeting SSTR2 in NETs is very *** study firstly combined mesoporous silica-coated gold nanorods(AuNRs@mSiO_(2))and targeting-SSTR2 dodecane tetraacetic acidtyrosine3-octreotate(DOTA-TATE)into AuNRs@mSiO_(2)@DOTA-TATE to investigate NETs inhibition under near-infrared ***@mSiO_(2)@DOTA-TATE showed good photothermal conversion *** vitro,under light irradiation,the cell viability significantly decreased with increasing AuNR@mSiO_(2)@DOTA-TATE concentration;in two successfully established neuroendocrine tumour organoids with SSTR2 expression,AuNRs@mSiO_(2)@DOTA-TATE with light inhibited tumours significantly better than AuNRs@mSiO_(2) with *** vivo,the SSTR2-targeting ability and biodistribution of AuNRs@mSiO_(2)@DOTA-TATE were confirmed with AuNRs@mSiO_(2)@64Cu-DOTA-TATE under micro-positron emission tomography/computed tomography(micro-PET/CT);in the AuNRs@mSiO_(2)@DOTA-TATE with laser group,the tumour surface temperature increased rapidly,with tumour volumes similar to those in the octreotide group and significantly lower than those in other *** was no significant difference in mice body weight between the AuNRs@mSiO_(2)@DOTA-TATE with laser group and other *** significant inflammatory lesions or cell necrosis was found in the main *** summary,we presented a feasible strategy to construct AuNRs@mSiO_(2)@DOTA-TATE with good photothermal conversion efficiency,targetingSSTR2 ability,significant antitumour effects,and good biocompatibility,warranting further explorations of AuNRs@mSiO_(2)@DOTA-TATE for NETs therapy applications.

关键词： neuroendocrine tumours somatostatin receptor 2 nanoparticles photothermal therapy

Storage, form, and influencing factors of karst inorganic carbon in a carbonate area in China

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Science China Earth Sciences 2024年第3期67卷 725-739页

作者： Chaochao DU Xiaoyong BAI Yangbing li Qiu TAN Cuiwei ZHAO Guangjie LUO Luhua WU Fei CHEN Chaojun li Chen RAN Sirui ZHANG lian XIONG Fengjiao SONG Biqin XIAO zilin li Yingying XUE Mingkang LONG Qing LUO Xiaoyun ZHANG Minghui li Xiaoqian SHEN Shu YANG State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China School of Geography and Environmental Sciences Guizhou Normal UniversityGuiyang 550001China CAS Center for Excellence in Quaternary Science and Global Change Xi'an 710061China Guizhou Provincial Key Laboratory of Geographic State Monitoring of Watershed Guizhou Normal CollegeGuiyang 550018China College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China

Carbonate rock chemical weathering carbon sinks reduce the rate of increase of the atmospheric CO_(2) concentration and global warming. However, uncertainty still exists in the estimation results of carbonate rock chemical weathering carbon sink fluxes(CCSF), and the contributions of climate change and ecological restoration to the CCSF are not clear. To this end, we compiled published site data on ion concentrations in different watersheds in China and used a classical thermodynamic dissolution model to reassess the potential and spatial and temporal patterns of the CCSF in China from 1991 to 2020. We quantified the contributions of temperature(MAT), precipitation(MAP), evapotranspiration(ET), soil water(SM), and the normalized difference vegetation index(NDVI) to the CCSF. The results revealed that(1) China's CCSF was 22.76 t CO_(2)km^(-2)yr^(-1), which was higher than the global average(15.77 t CO_(2)km^(-2)yr^(-1)). The total carbonate rock chemical weathering carbon sink(CCS) was 4772.67×10^(4)t CO_(2), contributing 14.91% of the global CCS through a carbonate rock area of 252.98×10^(4)km^(-2).(2) China's CCSF decreased gradually from southeast to northwest, with values of 33.14, 12.93, and7.27 t CO_(2)km^(-2)yr^(-1)in the southern karst, Qinghai-Tibetan karst, and northern karst regions, respectively.(3) The overall CCSF in China exhibited an increasing trend from 1991 to 2020, with a rate of increase of 0.16 t CO_(2)km^(-2)yr^(-1).(4) The contributions of the MAP, MAT, ET, SM, and NDVI to the CCSF were 63.3%, 3.02%, 27.5%, 3.1%, and 3.05%, respectively. Among them, the increase in precipitation was the main contributor to the increase in the CCSF in China over the last 30 years, while the enhancement of ET offset part of the positive contribution of the increase in precipitation to the CCSF. In conclusion, the results of this study provide a systematic quantification of the magnitude, the patterns, and the influencing factors of CCS over a long time series in

关键词： Carbonate rocks Carbon sinks Patterns Influencing factors Thermodynamic dissolution modeling

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Nano friction behaviour between magnetic materials and copper considering the inter-diffusion effect

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Friction 2024年第7期12卷 1532-1547页

作者： zilin li lisha DOU Shiyu YANG Huajiang OUYANG Qichen ZHU Xiaoyang CHEN Xin JIA Shuaiwei DOU Xiaolong CUI Yudong ZHANG Jingjiang QIU Guochen QI Bangbang NIE Pan liU Ronghan WEI School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China Engineering Technology Research Center of Henan Province for MEMS Manufacturing and Application Zhengzhou UniversityZhengzhou 450001China Institute of Intelligent Sensing Zhengzhou UniversityZhengzhou 450001China School of Engineering University of LiverpoolLiverpool L693GHUK School of Cyber Science and Engineering&Hanwei Institute of Internet of Things Zhengzhou UniversityZhengzhou 450001China

Copper,permalloy,cobalt,and silicon are the materials that have been widely utilised in magnetic *** the size of interest is down to the nanoscale,the inter-diffusion between certain materials becomes *** paper studies the nanoscale friction characteristics between frictional pairs with and without inter-diffusion properties through the atomic force *** distinct evolution features of nanoscale friction force when inter-diffusion is involved are discovered experimentally,which is also confirmed through theoretical ***,through the thin film deposition method,four pairs of contact materials(Cu–Ni_(81)Fe_(19),Si–Ni_(81)Fe_(19),Cu–Co,Cu–Si)are designed for friction tests,in which diffusion occurs at the interface of Cu–Ni_(81)Fe_(19)***,the effects of sliding velocity and loading force on the nano friction of each pair are *** is found that regardless of the diffusion phenomenon:(1)the adhesion force values exhibit a notable correlation to the values of the friction force;(2)the friction force in all four material pairs consistently increases with the growth of the normal loading force,although the growth rate may *** terms of the sliding velocity effect,the friction forces of immiscible materials(Si–Ni_(81)Fe_(19),Cu–Co,and Cu–Si)are found to increase with the increasing sliding ***,the friction force of Cu–Ni_(81)Fe_(19),decreases with the increasing sliding ***,a compositive friction model considering both the velocity and the normal force effect was proposed,which shows good agreement with the experimental results and explains the nano friction behaviour of both miscible and immiscible metals.

关键词： atomic force microscope friction force normal load sliding velocity