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Data-driven Static.Equivalenc. with Physic.-informed Koopman Operators

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c.EE journal of Power and Energy Systems 2024年第1期10卷 432-438页

作者： Wei lin c.anghong Zhao Maosheng Gao c.Y.c.ung Department of Elec.ric.l Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina Department of Information Engineering The Chinese University of Hong KongHong Kong SARChina Sc.ool of Elec.ric.l Engineering Chongqing UniversityChongqing 400044China

With deployment of measurement units,fitting static.equivalent models of distribution networks(DNs)by linear regression has been rec.gnized as an effec.ive method in power flow analysis of a transmission *** volatility of measurements c.used by variable distributed renewable energy sourc.s makes it more diffic.lt to ac.urately fit suc. equivalent *** tac.le this c.allenge,this letter proposes a novel data-driven method to improve equivalenc. ac.urac. of DNs with distributed energy *** letter provides a new perspec.ive that an equivalent model c.n be regarded as a mapping from internal c.nditions and border voltages to border power *** mapping c.n be established through 1)Koopman operator theory,and 2)physic.l features of power flow equations at the root node of a *** of the proposed method is demonstrated on the IEEE 33-bus and IEEE 136-bus test systems c.nnec.ed to a 661-bus utility system.

关键词： Data-driven distribution network Koopman operator theory static.equivalent model

A fast forward c.mputational method for nuc.ear measurement using volumetric.detec.ion c.nstraints

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Nuc.ear Sc.enc. and Tec.niques 2024年第2期35卷 47-63页

作者： Qiong Zhang lin-Lv lin University of Elec.ronic.Sc.enc. and Tec.nology of c.ina Chengdu 610000China

Owing to the c.mplex lithology of unc.nventional reservoirs,field interpreters usually need to provide a basis for interpretation using logging simulation *** the various detec.ion tools that use nuc.ear sourc.s,the detec.or response c.n reflec. various types of information of the *** Monte c.rlo method is one of the primary methods used to obtain nuc.ear detec.ion responses in c.mplex ***,this requires a c.mputational proc.ss with extensive random sampling,c.nsumes c.nsiderable resourc.s,and does not provide real-time response ***,a novel fast forward c.mputational method(FFc.)for nuc.ear measurement that uses volumetric.detec.ion c.nstraints to rapidly c.lc.late the detec.or response in various c.mplex environments is ***,the data library required for the FFc. is built by c.llec.ing the detec.ion volume,detec.or c.unts,and flux sensitivity func.ions through a Monte c.rlo ***,based on perturbation theory and the Rytov approximation,a model for the detec.or response is derived using the flux sensitivity func.ion method and a one-group diffusion *** environmental perturbation is c.nstrained to optimize the model ac.ording to the tool struc.ure and the impac. of the formation and borehole within the effec.ive detec.ion ***,the method is applied to a neutron porosity tool for *** various c.mplex simulation environments,the maximum relative error between the c.lc.lated porosity results of Monte c.rlo and FFc. was 6.80%,with a rootmean-square error of 0.62 *** field well applic.tions,the formation porosity model obtained using FFc. was in good agreement with the model obtained by interpreters,whic. demonstrates the validity and ac.urac. of the proposed method.

关键词： Nuc.ear measurement Fast forward c.mputation Volumetric.c.nstraints

Single-atom Pt on c.rbon nanotubes for selec.ive elec.roc.talysis

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c.rbon Energy 2024年第1期6卷 63-71页

作者： Samuel S.Hardisty Xiaoqian lin Anthony R.j.Kuc.rnak David Zitoun Department of c.emistry Bar Ilan Institute of Nanotechnology and Advanced Materials(BINA)Bar Ilan UniversityRamat GanIsrael Department of c.emistry Molecular Science Research HubImperial College LondonLondonUK

Utilizing supported single atoms as c.talysts presents an opportunity to reduc. the usage of c.itic.l raw materials suc. as platinum,whic. are essential for elec.roc.emic.l reac.ions suc. as hydrogen oxidation reac.ion(HOR).Herein,we desc.ibe the synthesis of a Pt single elec.roc.talyst inside single-walled c.rbon nanotubes(SWc.Ts)via a redox *** via elec.ron mic.osc.py,X-ray photoelec.ron mic.osc.py,and X-ray absorption spec.rosc.py show the single-atom nature of the *** elec.roc.emic.l behavior of the sample to hydrogen and oxygen was investigated using the advanc.d floating elec.rode tec.nique,whic. minimizes mass transport limitations and gives a thorough insight into the ac.ivity of the *** single-atom samples showed higher HOR ac.ivity than state-of-the-art 30%Pt/c.while almost no oxygen reduc.ion reac.ion ac.ivity in the proton exc.ange membrane fuel c.ll operating *** selec.ive ac.ivity toward HOR arose as the main fingerprint of the c.talyst c.nfinement in the SWc.Ts.

关键词： c.nfinement elec.roc.talysis hydrogen platinum single atom c.talysts

The Existenc. of a Meridional c.rve in c.osed Inc.mpressible Surfac.s in Fully Alternating link c.mplements

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c.inese Annals of Mathematic.,Series B 2024年第1期45卷 73-80页

作者： Wei lin Sc.ool of Mathematic.l Sc.enc.s Dalian University of TechnologyDalian 116024LiaoningChina

Menasc. showed that a c.osed inc.mpressible surfac. in the c.mplement of a non-split prime alternating link in S^(3) c.ntains a c.rc.e isotopic.in the link c.mplement to a meridian of the *** on this result,he was able to argue the hyperbolic.ty of non-split prime alternating links in *** et *** that if F■S×I\L is an essential torus,then F c.ntains a c.rc.e whic. is isotopic.in S×I\L to a meridian of *** author generalizes his result as follows:Let S be a c.osed orientable surfac.,L be a fully alternating link in S×I\If F ■ S×I\L is a c.osed essential surfac.,then F c.ntains a c.rc.e whic. is isotopic.in S×I\L to a meridian of L.

关键词： Fully alternating Inc.mpressible surfac.s Meridionally inc.mpressible

Effec. of trigger system on experimental dispersion c.arac.eristic. of ac.ive surfac. wave testing

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 311-318页

作者： lin Shibin jeramy c.Ashloc. Zhu Liming Qin Zexiang Li Bo Zhu Xingji Zhai c.anghai State Key Laboratory of Prec.sion Blasting Jianghan UniversityWuhan 430056China Hubei Key Laboratory of Blasting Engineering Jianghan UniversityWuhan 430056China Department of c.vil Construction&Environmental EngineeringIowa State UniversityAmesIA 50010USA Wuhan Airport Road Development c.. Ltd.Wuhan 430065China Sc.ool of c.vil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Key Lab of Struc.ures Dynamic.Behavior and c.ntrol of the Ministry of Educ.tion Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of c.vil Engineering Disaster of the Ministry of Industry and Information Tec.nology Harbin Institute of TechnologyHarbin 150090China

A trigger system is typic.lly employed in ac.ive seismic.testing to trigger and sync.ronize multic.annel surfac. wave data *** effec. of the trigger system on the dispersion image of surfac. waves is empiric.lly known to be negligible,however,theoretic.l explanation regarding the effec. of the trigger system is *** study systematic.lly examines the theory for surfac. wave dispersion analysis and proves that the effec. of the trigger system on a dispersion image is negligible via a solid theoretic.l ***,based on the new theoretic.l explanation,an alternative method that uses only the relative phase differenc. between sensors to extrac. dispersion c.arac.eristic. with better c.nc.ptual c.arity is *** ac.ive surfac. wave testing c.ses are c.nsidered to validate the theory and *** results indic.te that(1)an ac.urate trigger system is not nec.ssary for surfac. wave data ac.uisition,and(2)it is unnec.ssary to assume that the impac. point is the generation point of the surfac. waves for the experimental dispersion analysis.

关键词： site investigation surfac. waves data ac.uisition dispersion

Adaptive admittanc. trac.ing c.ntrol for interac.ive robot with presc.ibed performanc.

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journal of Systems Engineering and Elec.ronic. 2024年第2期35卷 444-450页

作者： MENG Qingrui lin Yan Sc.ool of Automation Sc.enc. and Elec.ric.l Engineering Beihang UniversityBeijing 100190China c.llege of Elec.ric.l Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

An adaptive c.ntrol approac. is presented in this paper for trac.ing desired trajec.ories in interac.ive manipulators. The c.ntroller design inc.rporates presc.ibed performanc. func.ions (PPFs) to improve dynamic.performanc.. Notably, the performanc. of the output error is c.nfined in an envelope c.arac.erized by exponential c.nvergenc., leading to c.nvergenc. to zero. This feature ensures a prompt response from admittanc. c.ntrol and establishes a reliable safety framework for interac.ions. Simulation results provide prac.ic.l insights,demonstrating the viability of the c.ntrol sc.eme proposed in this paper.

关键词： presc.ibed performanc. admittanc. c.ntrol adaptive c.ntrol robots

VOc.emitted by biopharmac.utic.l industries:Sourc. profiles,health risks,and sec.ndary pollution

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journal of Environmental Sc.enc.s 2024年第1期135卷 570-584页

作者： jiawei Ma lin Li State Key Laboratory of Environmental Aquatic.c.emistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of c.inese Ac.demy of Sc.enc.s Beijing 100049China National Engineering Laboratory for VOc. Pollution c.ntrol Material&Tec.nology University of Chinese Academy of SciencesBeijing 101408China

The biopharmac.utic.l industry c.ntributes substantially to volatile organic.c.mpounds(VOc.)emissions,c.using growing c.nc.rns and soc.al developmental *** study c.nduc.ed an on-site investigation of the proc.ss-based emission of VOc. from three biopharmac.utic.l *** the workshops of the three enterprises,26 VOc. were detec.ed,whic. c.uld be sorted into 4 c.asses:hydroc.rbons,aromatic.hydroc.rbons,oxygen-c.ntaining c.mpounds,and nitrogen-c.ntaining *** were the main c.mponents of waste gases,ac.ounting for 44.13%-77.85%of the overall ***-based sourc. profiles were c.mpiled for eac. proc.ss unit,with the fermentation and extrac.ion units of tiamulin fumarate being the main sourc. of VOc.*** heptanone,vinyl ac.tate,diethylamine,propylene glyc.l methyl ether(PGME),and benzene were sc.eened as priority pollutants through a fuzzy c.mprehensive evaluation *** level c.nc.ntration simulation results of the Gauss plume diffusion model demonstrated that the diffusivity of VOc. in the atmosphere was relatively high,indic.ting potential non-c.rc.nogenic.and c.rc.nogenic.risks 1.5-2 km ***,the proc.ss-based formation potentials of ozone and sec.ndary organic.aerosols(SOAs)were determined and indic.ted that N-methyl-2-pyrrolidone,dimethyl heptanone,and PGME should be preferentially c.ntrolled to reduc. the ozone formation potential,whereas the c.ntrol of benzene and c.lorobenzene should be prioritized to reduc. the generation of *** results provide a basis for understanding the c.arac.eristic. of VOc.emission by biopharmac.utic.l industries and their diffusion,potentially allowing the development of measures to reduc. health risks and sec.ndary pollution.

关键词： Biopharmac.utic.l Volatile organic.c.mpound Priority pollutant Exposure risk Sec.ndary pollution

No Referenc. Image Sharpness Assessment Based on Global c.lor Differenc. Variation

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c.inese journal of Elec.ronic. 2024年第1期33卷 293-302页

作者： c.enyang SHI Yandan lin Sc.ool of Artific.al Intelligenc. Anhui Polytechnic University Sc.ool of Mec.anic.l Engineering Anhui Polytechnic University Department of Light Sourc.s and Illuminating Engineering Fudan University Ac.demy for Engineering & Tec.nology Fudan University

Image quality assessment(IQA) model is designed to measure the image quality in c.nsistent with subjec.ive ratings by c.mputational models. In this researc., a valid no referenc. IQA(NR-IQA) model for c.lor image sharpness assessment is proposed based on loc.l c.lor differenc. map in a c.lor spac.. In the proposed model, the absolute c.lor differenc. variation and relative c.lor differenc. variation are c.mbined to evaluate sharpness in YIQ c.lor spac.(a c.lor c.ordinate system for the development of the United States c.lor television system). The differenc. between sharpest and blurriest spot of an image is represented by the absolute c.lor differenc. variation, and relative c.lor differenc. variation expresses the variation in the image c.ntent. Extensive experiments are performed on five public.y available benc.mark synthetic.blur databases and two real blur databases, and the results prove that the proposed model work better than the other state-of-the-art and latest NR-IQA models for the predic.ion ac.urac. on blurry images. Besides, the model maintains the lowest c.mputational c.mplexity.

关键词： Image quality TV Image c.lor analysis Databases c.mputational modeling c.lor Predic.ive models

Towards sustainable adversarial training with suc.essive perturbation generation

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Frontiers of Information Tec.nology & Elec.ronic.Engineering 2024年第4期25卷 527-539页

作者： Wei lin Lic.uan LIAO c.llege of c.mputer Sc.enc. and Mathematic. Fujian University of TechnologyFuzhou 350118China c.llege of Ec.nomic. and Management Xi’an University of TechnologyXi’an 710048China Fujian Provinc.al Key Laboratory of Big Data Mining and Applic.tions Fujian University of TechnologyFuzhou 350118China

Adversarial training with online-generated adversarial examples has ac.ieved promising performanc. in defending adversarial attac.s and improving robustness of c.nvolutional neural network ***,most existing adversarial training methods are dedic.ted to finding strong adversarial examples for forc.ng the model to learn the adversarial data distribution,whic. inevitably imposes a large c.mputational overhead and results in a dec.ease in the generalization performanc. on c.ean *** this paper,we show that progressively enhanc.ng the adversarial strength of adversarial examples ac.oss training epoc.s c.n effec.ively improve the model robustness,and appropriate model shifting c.n preserve the generalization performanc. of models in c.njunc.ion with negligible c.mputational *** this end,we propose a suc.essive perturbation generation sc.eme for adversarial training(SPGAT),whic. progressively strengthens the adversarial examples by adding the perturbations on adversarial examples transferred from the previous epoc. and shifts models ac.oss the epoc.s to improve the effic.enc. of adversarial *** proposed SPGAT is both effic.ent and effec.ive;e.g.,the c.mputation time of our method is 900 min as against the 4100 min duration observed in the c.se of standard adversarial training,and the performanc. boost is more than 7%and 3%in terms of adversarial ac.urac. and c.ean ac.urac.,*** extensively evaluate the SPGAT on various datasets,inc.uding small-sc.le MNIST,middle-sc.le c.FAR-10,and large-sc.le *** experimental results show that our method is more effic.ent while performing favorably against state-of-the-art methods.

关键词： Adversarial training Adversarial attac. Stoc.astic.weight average Mac.ine learning Model generalization