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arXiv 2022年

作者： Li, Chengyuan Qiu, Zhifang Ma, Yugao Li, Meifu Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

Prognosis of the reactor accident is a crucial way to ensure appropriate strategies are adopted to avoid radioactive releases. However, there is very limited research in the field of nuclear industry. In this paper, we propose a method for accident prognosis based on the Temporal Fusion Transformer (TFT) model with multi-headed self-attention and gating mechanisms. The method utilizes multiple covariates to improve prediction accuracy on the one hand, and quantile regression methods for uncertainty assessment on the other. The method proposed in this paper is applied to the prognosis after loss of coolant accidents (LOCAs) in HPR1000 reactor. Extensive experimental results show that the method surpasses novel deep learning-based prediction methods in terms of prediction accuracy and confidence. Furthermore, the interference experiments with different signal-to-noise ratios and the ablation experiments for static covariates further illustrate that the robustness comes from the ability to extract the features of static and historical covariates. In summary, this work for the first time applies the novel composite deep learning model TFT to the prognosis of key parameters after a reactor accident, and makes a positive contribution to the establishment of a more intelligent and staff-light maintenance method for reactor systems. Copyright © 2022, The Authors. All rights reserved.

关键词： Nuclear industry

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Bi-Orthogonal Projection Learning for Dimensionality Reduction 3

Bi-Orthogonal Projection Learning for Dimensionality Reducti...

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3rd International Conference on Intelligent Power and Systems, ICIPS 2023

作者： Liang, Yingyi Fan, Junjun Li, Chunsheng Wen, Jiajun Guangdong University of Technology Guangzhou China Shenzhen University College of Computer Science & Software Engineering Shenzhen China Laboratory for Artificial Intelligence in Design Hong Kong

ISBN: (纸本)9798350328691

This paper proposes a novel bi-orthogonal projection learning (BOPL) for dimensionality reduction (DR) methods, which further extends the existing DR to a more flexible, robust, and sparse embedding framework. Unlike conventional methods that use only one kind of projection for learning in DR, the proposed BOPL introduces two kinds of projection, which are orthogonal and provides the true projection the freedom for more accurate data transformation in subspace learning. Inspired by the observation that the two projections share many similar data structures, the projections are expected to preserve the similarity structure of data by using two different reconstruction ways. The proposed method can also handle data corrupted by noises since a sparse item is employed to compensate for the noises during DR. Several novel unsupervised DR methods (i.e., BOPL_PCA, BOPL_NPE, and BOPL_LPP) are derived from the proposed framework. The results of experiments on the natural and synthetic data sets demonstrate that the proposed methods outperform the existing well-established DR methods. ©2023 IEEE.

关键词： Metadata

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Mechanically Stable and Damage Resistant Freestanding Ultrathin Silver Nanowire Films with Closely Packed Crossed-Lamellar Structure

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Precision Chemistry 2024年第12期2卷 634-643页

作者： Si-Chao Zhang Huai-Ling Ga Long Zhang Yin-Bo Zhu Ya-Dong Wu Jian-Wei Liu Li-Bo Mao Mei Feng Liang Dong Zhao Pan Xiang-Sen Meng Yang Lu Shu-Hong Yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering School of Chemistry and Chemical EngineeringHefei University of TechnologyHefeiAnhui 230009P.R.China Institute of Innovative Materials(I2M) Department of ChemistryDepartment of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

One-dimensional(1D)functional nanowires are widely used as nanoscale building blocks for assembling advanced nanodevices due to their unique ***,previous research has mainly focused on nanowire functionality,while neglecting the structural stability and damage resistance of nanowire assemblies,which are critical for the long-term operation of *** achieve excellent mechanical stability and damage resistance through sophisticated structural ***,we successfully prepared a mechanically stabilized monolamella silver nanowire(Ag NW)film,based on a facile bubblemediated assembly and nondestructive transfer strategy with the assistance of a porous mixed cellulose ester substrate,inspired by the hierarchical structure of *** to the closely packed arrangement of Ag NWs combined with their weak interfaces,the monolamellar Ag NW film can be transferred to arbitrary substrates without ***,freestanding multilamellar Ag NW films with impressive damage resistance can be obtained from the monolamellar Ag NW film,through the introduction of bioinspired closely packed crossed-lamellar(CPCL)*** CPCL structure maximizes intra-and interlamellar interactions among Ag NWs ensuring efficient stress transfer and uniform electron transport,resulting in excellent mechanical durability and stable electrical properties of the multilamellar Ag NW films.

关键词： Biomimetics hierarchical structure structural stability damage resistance functional nanowire assemblies

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Direct ink writing of gradient shear-stiffening elastomer for enhanced toughness and impact resistance

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Journal of Industrial and Engineering Chemistry 2025年 149卷 593-603页

作者： Gong, Liping Zhao, Chunyu Lu, Hongda Zhang, Qingtian Chen, Zexin Yang, Junjie Yang, Jinyu Sun, Shuaishuai Du, Haiping Li, Weihua School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia CAS Key Laboratory of Mechanical Behaviour and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230027 China School of Electrical Computer and Telecommunication Engineering University of Wollongong Wollongong2522 Australia

Shear-stiffening materials have garnered significant attention due to their inherent ability to rapidly respond to changes in strain rate. However, conventional studies on these materials exhibit limited mechanical performance and insufficient structural design, hindering applications in material science and smart mechatronics. Inspired by the gradient structure of a squid beak, this study uses a direct-ink-writing (DIW) technology to develop a novel gradient shear-stiffening elastomer (GSSE). Comprehensive characterizations were conducted to optimize the printability of the shear-stiffening elastomer under various testing conditions, including rheology, compression, and tension. Additionally, the toughness and impact resistance of the elastomer were systematically investigated. It is demonstrated that the biomimetic GSSE exhibits enhanced flexibility, efficient energy dissipation, and outstanding impact resistance. Consequently, this work advances the field of shear-stiffening elastomers for diverse applications by leveraging the gradient structure design strategy to achieve superior mechanical performance under complex loading conditions. © 2025 The Author(s)

关键词： Strain rate

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Intra Fast Mode Decision Algorithm and Hardware design for AVS2

Intra Fast Mode Decision Algorithm and Hardware Design for A...

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2021 International Conference on Signal Processing and Machine Learning, CONF-SPML 2021

作者： Xie, Hao Liu, Kaiyang Zhao, Yang Zheng, Xiao Qing, Xianguo Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu China Peking University School of Software and Microelectronics Beijing China

ISBN: (纸本)9781665417341

AVS2 is a kind of video coding standard proposed by China, it adopts 33 intra prediction modes to improve coding performance, while the computational complexity has increased dramatically. In order to reduce the complexity of AVS2 intra mode decision and make the AVS2 hardware encoder meet real-time requirements, this paper proposes the AVS2 intra fast mode decision algorithm and hardware design. The experimental results show that the intra mode decision algorithm and hardware design proposed in this paper can meet the throughput requirement of 1920x1080@60fps at a clock frequency of 300MHz. By using Xilinx FPGA XC7K325T 900 on the Vivado HLS platform for synthesis, only 10% of the LUT, 5% of FF, 5% of BRAM, and 6% of DSP in FPGA resources are consumed to meet the design requirements. © 2021 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Transient analysis and optimization of passive residual heat removal heat exchanger in advanced nuclear power plant

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Nuclear science and Techniques 2022年第8期33卷 147-162页

作者： Yan-Bin Liu Xiang-Yu Meng Xue-Sheng Wang Qi-Ming Men Yu-Yang Yuan Jia-Ming Cao Key Laboratory of Pressure Systems and Safety Ministry of EducationEast China University of Science and TechnologyShanghai 200237China Shanghai Nuclear Engineering Research and Design Institute State Power Investment CorporationShanghai 200233China

The transient performance and optimization of a passive residual heat removal heat exchanger(PRHR HX)were ***,a calculation method was developed for predicting the heat transfer of the PRHR *** calculation results were validated through comparisons with ROSA experimental *** heat-transfer performance of the AP1000 PRHR HX in the initial period was predicted,and it satisfied the design ***,the distributions of the heat flux,tube-inside/outside heattransfer coefficients,and heat load for the AP1000 PRHR HX over 2000 s were ***,an optimization study was conducted by adjusting the horizontal length and tube *** effects on the four main heat-transfer parameters and the heat-transfer area were ***,the influence of the initial in-containment refueling water storage tank(IRWST)temperature was investigated using an established simulation *** results indicated that it significantly affected the trends of the IRWST temperature and reactor outlet ***,the minimum required flow rates over time to maintain the reactor outlet temperature at the safety line were determined for different start-up *** trends of the minimum required flow rate and the peak flow rate were analyzed.

关键词： Heat transfer PRHR HX Transient analysis Optimization investigation

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Photo-Activated Snap-Through of Nematic Shallow Spherical Shells

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Acta Mechanica Solida Sinica 2022年第2期35卷 239-247页

作者： Yanli Lin Linghui He Renhuai Liu MOE Key Lab of Disaster and Control in Engineering Institute of Applied MechanicsJinan UniversityGuangzhou 510632China CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of ChinaHefei 230026China

Photo-responsive nematic polymers can transduce light into mechanical work,but the rate is limited by the quasi-static *** enhance the work output,a strat・egy of exploiting photo-triggered snap-through of glassy nematic shallow spherical shells with hemeotropic director alignment is examined *** criterion for the nonlinear instability is derived analytically by using the modified iteration *** is shown that,for thin shells of small height and large basal radius,snap-through can be caused by an incident light with moderate irradiation *** phenomenon may inspire some new designs of contactless and ultra-fast actuation devices with high-rate output of mechanical work.

关键词： Nematic shell Snap-through Ultra-fast actuation

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AN OVERVIEW STUDY ON NEUTRON FLUX AND SPECTRUM CHARACTERISTICS OF HIGH FLUX reactor 30

AN OVERVIEW STUDY ON NEUTRON FLUX AND SPECTRUM CHARACTERISTI...

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30th International Conference on Nuclear Engineering, ICONE 2023

作者： Xu, Wei Wang, Yan Li, Jian Liu, Zhihong Zhao, Jing Xie, Heng Xie, Fei Shi, Lei School of Nuclear Science and Engineering Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy North China Electric Power University Beijing102206 China Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China

ISBN: (纸本)9784888982566

High flux reactor with considerable neutron flux and spectrum plays an important role in medical care, industry, agriculture, energy, public safety, etc. In this paper, the neutron flux and energy spectrum characteristics of high flux reactors in three main application fields are reviewed and analyzed. The neutron flux level that could be achieved is corresponding to the design features of high flux reactor. Technical measures are adopted in order to enlarge neutron flux and optimize energy spectrum. Furthermore, the requirements of nuclear fuel and material irradiation test, radioisotope production and neutron scattering/imaging technique for high flux reactor are summarized. Finally, it is concluded that the construction of ultra-high neutron flux with broad energy spectrum is essential for the development of innovative high flux reactors. © 2023 by JSME.

关键词： Neutron flux

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Engineered Janus hydrogels: biomimetic surface engineering and biomedical applications

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National science Review 2024年第10期11卷 350-367页

作者： Mingfei Pan Tao Shui Ziqian Zhao Li Xiang Bin Yan Ning Gu Hongbo Zeng Department of Chemical and Materials Engineering University of Alberta Changzhou Second People's Hospital Changzhou Medical Center Nanjing Medical University School of Materials Science and Engineering Southeast University School of Mechanical Engineering Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University National Engineering Laboratory for Clean Technology of Leather Manufacture College of Biomass Science and Engineering Sichuan University Nanjing Key Laboratory for Cardiovascular Information and Health Engineering Medicine Institute of Clinical Medicine Nanjing Drum Tower Hospital Medical School Nanjing University

Hydrogel bioadhesives, when applied to dysfunctional tissues substituting the epidermis or endothelium,exhibit compelling characteristics that enable revolutionary diagnostic and therapeutic procedures. Despite their demonstrated efficacy, these hydrogels as soft implants are still limited by improper symmetric surface functions, leading to postoperative complications and disorders. Janus hydrogel bioadhesives with unique asymmetric surface designs have thus been proposed as a reliable and biocompatible hydrogel interface,mimicking the structural characteristics of natural biological barriers. In this comprehensive review, we provide guidelines for the rational design of Janus hydrogel bioadhesives, covering methods for hydrogel surface chemistry and microstructure engineering. The engineering of Janus hydrogels is highlighted,specifically in tuning the basal surface to facilitate instant and robust hydrogel-tissue integration and modulating the apical surface as the anti-adhesion, anti-fouling, and anti-wear barrier. These asymmetric designs hold great potential in clinical translation, supporting applications including hemostasis/tissue sealing, chronic wound management, and regenerative medicine. By shedding light on the potential of Janus hydrogels as bioactive interfaces, this review paper aims to inspire further research and overcome current obstacles for advancing soft matter in next-generation healthcare.

关键词： interfacial science bionics hydrogel bioadhesives asymmetric surfaces

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Distributed Cascade Force Control of Soft-Tactile-Based Multi-robot System for Object Transportation

Distributed Cascade Force Control of Soft-Tactile-Based Mult...

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2024 IEEE/SICE International Symposium on System Integration, SII 2024

作者： Nguyen, Duy Anh Dinh Le, Nhat Minh Nguyen, Nhan Huu Hung, Pham Duy Ho, Van Anh Ngo, Trung Dung University of Prince Edward Island More-Than-One Robotics Laboratory Faculty of Sustainable Design Engineering Charlottetown Canada University of Engineering and Technology Viet Nam School of Materials Science Japan Advanced Institute of Science and Technology Soft Haptics Lab. Asahidai 1-1 Ishikawa Nomi923-1292 Japan Presto Japan Science and Technology Agency Saitama Kawaguchi332-0012 Japan

ISBN: (纸本)9798350312072

In this paper, we present a distributed cascade force control system (DCFC) for multiple robots with the aim of pushing a rigid object towards a desired moving target without their inter-robot communication. These mobile robots are equipped with 360-degree vision-based soft tactile sensors utilized to determine contact location and resultant impact force. By investigating the dynamics of moving rigid objects on the flat, we proposed a distributed cascade control. The inner loop control incorporates contact force and positioning, ensuring the robots' pushing contact and applying the desired force to the object. The outer loop control coordinates the robots to push the object in a desired direction without inter-robot communication, regardless of unknown object mass and friction uncertainty. The stability and convergence of the control system are verified using the Lyapunov stability theory. We also conducted simulation and real-world experiments to validate the performance of the proposed control method, and the experimental results showcase the successful coordination of multiple robots in pushing an object towards a moving desired direction. © 2024 IEEE.

关键词： Multipurpose robots

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