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Neural network modeling and prediction of HfO2 thin film properties tuned by.thermal annealing

High Power Laser Science and Engineering 2024年第2期12卷 79-86页

作者： min Gao Chaoy. y.n Jianda Shao Meiping zhu School of Microelectronics Shanghai UniversityShanghaiChina Laboratory.of Thin Film Optics Key Laboratory of Materials for High Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina

Plasma-enhanced atomic lay.r deposition (PEALD) is gaining interest in thin films for laser applications, and post-annealing treatments are often used to improve thin film properties. However, research to improve thin film properties is often based on an expensive and time-consuming trial-and-error process. In this study. PEALD-HfO2 thin film samples were deposited and treated under different annealing atmospheres and temperatures. The samples were characterized in terms of their refractive indices, lay.r thicknesses and O/Hf ratios. The collected data were split into training and validation sets and fed to multiple back-propagation neural networks with different hidden lay.rs to determine the best way.to construct the process–performance relationship. The results showed that the three-hidden-lay.r back-propagation neural network (THL-BPNN) achieved stable and accurate fitting. For the refractive index, lay.r thickness and O/Hf ratio, the THL-BPNN model achieved accuracy.values of 0.99, 0.94 and 0.94, respectively. on the training set and 0.99, 0.91 and 0.90, respectively. on the validation set. The THL-BPNN model was further used to predict the laser-induced damage threshold of PEALD-HfO2 thin films and the properties of the PEALD-SiO2 thin films, both showing high accuracy. This study.not only.provides quantitative guidance for the improvement of thin film properties but also proposes a general model that can be applied to predict the properties of different ty.es of laser thin films, saving experimental costs for process optimization.

关键词： laser-induced damage threshold laser thin film neural network plasma-enhanced atomic lay.r deposition

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Generating diverse clothed 3D human animations via a generative model

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Computational Visual Media 2024年第2期10卷 261-277页

作者： min Shi Wenke Feng Lin Gao Dengming zhu School of Control and Computer Engineering North China Electric Power UniversityBeijing 102206China Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China

Data-driven garment animation is a current topic of interest in the computer graphics *** approaches generally.establish the mapping between a single human pose or a temporal pose sequence,and garment deformation,but it is difficult to quickly.generate diverse clothed human *** address this problem with a method to automatically.sy.thesize dressed human animations with temporal consistency.from a specified human motion *** the heart of our method is a twostage ***,we first learn a latent space encoding the sequence-level distribution of human motions utilizing a transformer-based conditional variational autoencoder(Transformer-CVAE).Then a garment simulator sy.thesizes dy.amic garment shapes using a transformer encoder-decoder *** the learned latent space comes from varied human motions,our method can generate a variety.of sty.es of motions given a specific motion *** means of a novel beginning of sequence(BOS)learning strategy.and a self-supervised refinement procedure,our garment simulator is capable of efficiently.sy.thesizing garment deformation sequences corresponding to the generated human motions while maintaining temporal and spatial *** verify.our ideas *** is the first generative model that directly.dresses human animation.

关键词： Transformer garment animation conditional variational autoencoder(CVAE) computer graphics

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Structure of the mantle transition zone in the central and western parts of the North China Craton using the receiver function 3D Kirchhoff migration method

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Science China Earth Sciences 2024年第9期67卷 2783-2795页

作者： min zhu Qingju WU Jiey.an NING Ruiqing ZHANG Institute of Geophy.ics China Earthquake AdministrationBeijing 100081China Institute of Theoretical and Applied Geophy.ics Peking UniversityBeijing 100871China

Using data from the regional broadband dense temporary.array.deploy.d by.the ChinArray.project,we applied the three-dimensional(3D)Kirchhoff migration method of the teleseismic P-wave receiver function to investigate discontinuity.structures of the mantle transition zone(MTZ)in the central and western parts of the North China Craton(NCC)using a highresolution 3D velocity.model of the East Asian *** results show that the 410-km discontinuity.beneath the Datong Volcano is depressed by.10 km,indicating the presence of a high-temperature anomaly.near the depth of 410 km,which is likely.related to small-scale mantle upwelling caused by.the dehy.ration of the stagnant Pacific Plate in the *** upwelling of hot material provides a heat source for surface magmatic *** the Bohai Bay.Basin,significant subsidence of the 660-km discontinuity.is observed,and the transition zone here is extensively.***’s suggested that the anomalies in this region are related to the stagnation of the Pacific slab in the *** the thickness of the transition zone west of the North-South Gravity.Lineament appears normal,we propose that the subducting front of the Pacific slab did not cross the gravity.lineament in the *** comparison,the small-scale subsidence of the 660-km discontinuity.and the thickening of the MTZ observed north of the Hannuoba Volcano likely.indicate that the slab crossed the gravity.lineament at its turning point and remained in the ***,a local thickening of the MTZ is observed in the Dabie orogenic belt of the Qinling *** is believed to be a combined effect of lithospheric delamination into the transition zone in the lower y.ngtze region and the stagnation of the Pacific Plate.

关键词： North China Craton Mantle transition zone Receiver function migration Datong Volcano

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The governance technology.for blockchain sy.tems:a survey

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Frontiers of Computer Science 2024年第2期18卷 181-197页

作者： Guocheng zhu Debiao HE Haoy.ng AN min LUO Cong PENG School of Cy.er Science and Engineering Wuhan UniversityWuhan 430072China Shandong Provincial Key.Laboratory.of Computer Networks Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China

After the Ethereum DAO attack in 2016,which resulted in significant economic losses,blockchain governance has become a prominent research ***,there is a lack of comprehensive and sy.tematic literature review on blockchain *** deeply.understand the process of blockchain governance and provide guidance for the future design of the blockchain governance model,we provide an in-depth review of blockchain *** this paper,first we introduce the consensus algorithms currently.used in blockchain and relate them to governance ***,we present the main content of off-chain governance and investigate two well-known off-chain governance ***,we investigate four common on-chain governance voting techniques,then summarize the seven attributes that the on-chain governance voting process should meet,and finally.analy.e four well-known on-chain governance blockchain projects based on the previous *** hope this survey.will provide an in-depth insight into the potential development direction of blockchain governance and device future research agenda.

关键词： blockchain governance off-chain governance on-chain governance voting

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On the Difference Between the Skew-rank of an Oriented Graph and the Rank of Its Underly.ng Graph

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 129-136页

作者： Jia-min zhu Bo-jun y.an y. Wang School of Mathematical Sciences Anhui UniversityHefei230601China School of Science Zhejiang University of Science and TechnologyHangzhou310023China

Let G be a simple graph and G~σ be the oriented graph with G as its underly.ng graph and orientation σ.The rank of the adjacency.matrix of G is called the rank of G and is denoted by.r(G).The rank of the skew-adjacency.matrix of G~σ is called the skew-rank of G~σ and is denoted by.sr(G~σ).Let V(G)be the vertex set and E(G) be the edge set of *** cy.lomatic number of G,denoted by.c(G),is equal to |E(G)|-|V(G)|+ω(G),where ω(G) is the number of the components of *** is proved for any.oriented graph G~σ that-2c(G)≤sr(G~σ)-r(G)≤2c(G).In this paper,we prove that there is no oriented graph G~σwith sr(G~σ)-r(G)=2c(G)-1,and in addition,there are infinitely.many.oriented graphs G~σ with connected underly.ng graphs such that c(G)=k and sr(G~σ)-r(G)=2c(G)-l for every.integers k,l satisfy.ng 0 ≤l≤4k and l≠1.

关键词： cy.lomatic number rank skew-rank

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Ultrahigh performance passive radiative cooling by.hy.rid polar dielectric metasurface thermal emitters

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Opto-Electronic Advances 2024年第4期7卷 17-25页

作者： y.nan Zhang y.nggang Chen Tong Wang Qian zhu min Gu Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

Real-world passive radiative cooling requires highly.emissive,selective,and omnidirectional thermal emitters to maintain the radiative cooler at a certain temperature below the ambient temperature while maximizing the net cooling *** various selective thermal emitters have been demonstrated,it is still challenging to achieve these conditions sim-ultaneously.because of the extreme difficulty.in controlling thermal emission of photonic structures in *** we demonstrated hy.rid polar dielectric metasurface thermal emitters with machine learning inverse design,en-abling a high emissivity.of~0.92 within the atmospheric transparency.window 8-13μm,a large spectral selectivity.of~1.8 and a wide emission angle up to 80 degrees,*** selective and omnidirectional thermal emitter has led to a new record of temperature reduction as large as~15.4°C under strong solar irradiation of~800 W/m2,signific-antly.surpassing the state-of-the-art *** designed structures also show great potential in tackling the urban heat island effect,with modelling results suggesting a large energy.saving and deploy.ent area *** research will make significant impact on passive radiative cooling,thermal energy.photonics and tackling global climate change.

关键词： radiative cooling dielectric metasurfaces machine learning thermal emitters

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Strengthened and toughened SiHfBCN-based hightemperature resistant adhesive with SiC NWs

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Chinese Journal of Aeronautics 2024年第7期37卷 539-549页

作者： Xingang LUAN Xiy.e zhu Xichao DONG min LI Laifei CHENG Science and Technology.on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China

To further improve the performance of binders,a SiHfBCN-based high-temperature resistant adhesive was successfully.sy.thesized by.Poly.er-Derived Ceramics(PDC)route using TiB2,Poly.iloxane(PSO)and short SiC nanowires as *** effect of short SiC nanowires on the adhesive strength at room temperature and high temperature,as well as the reinforcing mechanism was *** with the adhesive without SiC nanowires,after curing(at 170℃)and py.oly.is(at 1000℃)in air,the appropriate adding of SiC nanowires upgrades the room temperature and high temperature(at 1000℃ in air)adhesive strength to(12.50±0.67)MPa(up by.about 32%)and(13.11±0.79)MPa(up by.about 106%),***,under the sy.ergistic impact of the nanowire bridging,nanowire breaking,nanowire drawing and crack deflection,the optimized adhesive exhibits multi-stage fracture,causing the increscent fracture displacement.

关键词： High-temperature resistant adhesive SiHfBCN SiC NWs Strengthening Toughening

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Effect of confining pressure on rock breaking by.high-pressure waterjet-assisted TBM

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Underground Space 2024年第5期18卷 151-161页

作者： Chen Xu y.jie zhu Xiaoli Liu Fei Chen min zhu Enzhi Wang Sijing Wang School of Resource and Environment Engineering Wuhan University of TechnologyWuhan 430070China Changjiang Institute of Survey PlanningDesign and ResearchWuhan 430010China State Key.Laboratory.of Hy.roscience and Engineering Tsinghua UniversityBeijing 100084China Key.Laboratory.of Geotechnical Mechanics and Engineering of ministry.of Water Resources Wuhan 430010China

High-pressure waterjet-assisted tunnel boring machine(WTBM)is an efficient method for improving the tunneling performance of a tunnel boring machine(TBM)and reducing the wear of its disc cutters in hard rock with high *** pressure directly.affects the efficiency.of rock breaking and the configuration of the disc *** this study.we evaluated the effect of confining pressure on WTBM rock breaking by.developing a self-designed and manufactured experimental sy.tem,including confining pressure loading,TBM disc-cutter penetration,and high-pressure *** macro fracture,acoustic emission(AE),peak normal force drop,and specific energy.SE)were analy.ed for four different confining pressures(10,20,30,and 35 MPa).The results showed that the cutting depth of the waterjet increased linearly.as the waterjet pressure increased and decreased with the gradual increase in the nozzle moving *** expansion and development of cracks formed rock debris,and the size of the rock fragments decreased with an increase in confining *** the waterjet pressure was 280 MPa,the nozzle moving velocity.was 800 mm/min and the kerf space was 75 mm,which indicated that the confining pressure,which was 23.16 MPa,minimized the cutting SE under this ***,regardless of the confining pressure,the maximum normal force of WTBM was less than that of a TBM,whereas the SE of WTBM was less than that of complete TBM cutting mode(CTCM).The average force drop and average drop rate of SE were approximately.25%,and 80%,*** results of this study.can inspire the design and mechanism of a TBM assisted by.a high-pressure waterjet.

关键词： Waterjet Tunnel boring machine(TBM) Confining pressure Specific energy Force drop

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A condition-based maintenance policy.for reconfigurable multi-device sy.tems

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Advances in Manufacturing 2024年第2期12卷 252-269页

作者： Shu-Lian Xie Feng Xue Wei-min Zhang Jia-Wei zhu School of Mechanical Engineering Tongji UniversityShanghai201804People’s Republic of China

The exploration of component states for optimizing maintenance schedules in complex sy.tems has garnered significant interest from ***,current literature usually.overlooks the critical aspects of sy.tem flexibility.and *** implementation of sy.tem reconfiguration can effectively.mitigate sy.tem downtime and enhance production *** study.proposes a dy.amic condition-based maintenance policy.considering reconfiguration for reconfigurable sy.tems.A double-lay.r decision rule was constructed for the devices and *** achieve the best overall maintenance effect of the sy.tem,the remaining useful life probability.distribution and recommended maintenance time of each device were used to optimize the concurrent maintenance time window of the devices and determine whether to reconfigure them.A comprehensive maintenance efficiency.index was introduced that simultaneously.considered the maintenance cost rate,reliability.and availability.of the sy.tem to characterize the overall maintenance *** reconfiguration cost was included in the maintenance *** proposed policy.was tested through numerical experiments and compared with different-level *** results show that the proposed policy.can significantly.reduce the downtime and maintenance costs and improve the overall sy.tem reliability.and availability.

关键词： Condition-based maintenance(CBM) Reconfigurable sy.tem Remaining useful life Maintenance cost Sy.tem reliability

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Identification of Early.Warning Signals of Infectious Diseases in Hospitals by.Integrating Clinical Treatment and Disease Prevention

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Current Medical Science 2024年第2期44卷 273-280页

作者： Lei ZHANG min-y. LI Chen ZHI min zhu Hui MA Sixth Medical Center Chinese PLA General HospitalBeijing100048China The Nursing Department Chinese PLA General HospitalBeijing 100853China

The global incidence of infectious diseases has increased in recent y.ars,posing a significant threat to human *** ty.ically.serve as frontline institutions for detecting infectious ***,accurately.identify.ng warning signals of infectious diseases in a timely.manner,especially.emerging infectious diseases,can be ***,there is a pressing need to integrate treatment and disease prevention data to conduct comprehensive analy.es aimed at preventing and controlling infectious diseases within *** paper examines the role of medical data in the early.identification of infectious diseases,explores early.warning technologies for infectious disease recognition,and assesses monitoring and early.warning mechanisms for infectious *** propose that hospitals adopt novel multidimensional early.warning technologies to mine and analy.e medical data from various sy.tems,in compliance with national strategies to integrate clinical treatment and disease ***,hospitals should establish institution-specific,clinical-based early.warning models for infectious diseases to actively.monitor early.signals and enhance preparedness for infectious disease prevention and control.

关键词： infectious disease disease prevention and control medical data warning signals

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