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Numerical simulation of hydrogen diffusion in rubber O-rings containing a cavity defect based on thermomechanical coupling equivalent model

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International Journal of Hydrogen Energy 2025年 139卷 846-853页

作者： Chen, Qi Peng, Wenzhu Yang, Miaomiao Yao, Riwu Hua, Zhengli Zheng, Jinyang Shi, Jianfeng Institute of Process Equipment College of Energy Engineering Zhejiang University Hangzhou China College of Mechanical Engineering Zhejiang University Hangzhou310027 China Hydrogen Energy Institute Zhejiang University Hangzhou China Engineering Research Center of High Pressure Process Equipment and Safety MOE China State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou China

The blister fracture is a typical damage mode of rubber O-rings under high-pressure hydrogen environments, which are both affected by hydrogen diffusion and pressurization. It is essential to consider the combined effects of large deformation of rubber O-rings under hydrogen pressure and hydrogen-induced expansion on the cavity. Based on the similarity between heat conduction and diffusion equations, a thermomechanical coupling model is developed to simulate the hydrogen diffusion and deformation of rubber O-rings containing a cavity defect. The verification results demonstrate the robustness and reliability of the proposed method. It's found significant changes in the hydrogen concentration and strain field of rubber O-rings, as well as noticeable deformation of the cavity during hydrogen exposure. Meanwhile, the hydrogen diffusion and the deformation of the cavity in rubber O-rings of different materials are comprehensively analyzed. The analysis indicates that a higher diffusion coefficient decreases the possibility of cavity fracture. © 2024 Hydrogen Energy Publications LLC

关键词： Rubber

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Design and Experimental Validation of a Worm-Like Tensegrity Robot for In-Pipe Locomotion

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Journal of Bionic engineering 2023年第2期20卷 515-529页

作者： Xiaolin Dai Yixiang Liu Wei Wang Rui Song Yibin Li Jie Zhao School of Control Science and Engineering Shandong UniversityJinan250061China Engineering Research Center of Intelligent Unmanned System of Ministry of Education Jinan250061China Shandong Research Institute of Industrial Technology Jinan250061China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin150080China

Traditional rigid-body in-pipe robots usually have complex and heavy structures with limited flexibility and *** soft in-pipe robots have great improvements in flexibility,they still have manufacturing difficulties due to their reliance on high-performance soft *** structure is a kind of self-stressed spatial structure consisting discrete rigid struts connected by a continuous net of tensional flexible strings,which combines the advantages of both rigid structures and soft *** applying tensegrity structures into robotics,this paper proposes a novel worm-like tensegrity robot for moving inside ***,a robot module capable of body deformation is designed based on the concept of tensegrity and its deformation performance is ***,the optimal parameters of the module are obtained based on the tensegrity *** deformation ability of the tensegrity module is tested ***,the worm-like tensegrity robot that can crawl inside pipes is developed by connecting three modules in *** performance and load capacity are tested on the prototype of the worm-like tensegrity robot by experiments of moving in horizontal pipe,vertical pipe,and elbow *** results demonstrate the effectiveness of the proposed design and suggest that the robot has high compliance,mobility,and adaptability although with simple structure and low cost.

关键词： Bio-inspired robot Soft robot application Tensegrity structure Pipe crawling

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Surface Potential-Based Compact Model for ITO Thin-Film Transistors with Ultra-Thin Channel 17

Surface Potential-Based Compact Model for ITO Thin-Film Tran...

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17th IEEE International Conference on Solid-State and Integrated Circuit Technology, ICSICT 2024

作者： Xu, Wenting Shen, Xinxin Yu, Zuoxu Huang, Tingrui Zhang, Yuzhen Sun, Weifeng Wu, Wangran Southeast University National ASIC System Engineering Research Center Nanjing210096 China

ISBN: (纸本)9798350361834

In this paper, we propose a novel analytical surface potential-based compact model for Indium Tin Oxide (ITO) thin-film transistors (TFT) with ultra-thin channel. We develop an equivalent capacitance model that accounts for the thickness of the active layer to derive the surface potential, which reveals the coupling of both sides of the nano-meter ITO layer. By applying Schroder series modification, the analytical solution of surface potential is derived for the ITO TFTs with varying channel thicknesses. Subsequently, the carriers' mobility model is formulated in ITO films, grounded on the transport mechanisms of variable range hopping, trap limited conduction, and percolation conduction. Finally, leveraging the surface potential and mobility models, we derive a drain current model for ITO TFTs using the Sah equation. The resulting model is then integrated using Verilog-A language. The proposed model is applied to the simulation of an ITO TFT-based inverter, which agrees well with the experimental results. © 2024 IEEE.

关键词： Thin film transistors

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Multi-Dimensional Training Optimization for Efficient Federated Synergy Learning

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IEEE Transactions on Mobile Computing 2025年第7期24卷 6243-6258页

作者： Fu, Shucun Dong, Fang Chen, Runze Shen, Dian Zhang, Jinghui He, Qiang Southeast University School of Computer Science and Engineering Nanjing China Huazhong University of Science and Technology National Engineering Research Center for Big Data Technology and System Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Wuhan China

Edge learning (EL) is an end-to-edge collaborative learning paradigm enabling devices to participate in model training and data analysis, opening countless opportunities for edge intelligence. As a promising EL framework, federated synergy learning (FSyL) mitigates the computation and communication overhead on resource-constrained devices by offloading partial model layers to the edge server for synergistic training. Nevertheless, due to the system and statistical heterogeneity, naively using existing FSyL methods is significantly time-consuming and causes accuracy degradation. Motivated by this issue, this paper introduces a novel FSyL framework that integrates multi-dimensional training optimization and formulates the edge learning cost minimization (ELCM) problem. To tackle the ELCM efficiently, we design OL-MG, an OnLine Model Splitting and Resource Provisioning Game. Specifically, we first reformulate and decompose the original ELCM based on data quality evaluation. Then, given a model splitting decision, we determine the optimal resource provisioning in Sub-problem1, based on which optimal model splitting in Sub-problem2 is modeled as a potential game. Subsequently, we introduce a decentralized algorithm to find a Nash equilibrium (NE) solution. Furthermore, we further extend OL-MG to support a budget-aware multi-edge scenario. Extensive experiments demonstrate that the proposed mechanism significantly outperforms state-of-the-art methods in cost-saving and accuracy improvement. © 2025 IEEE.

关键词： Federated learning

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Recovery of cathode copper and ternary precursors from CuS slag derived by waste lithium-ion batteries:process analysis and evaluation

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Chinese Chemical Letters 2024年第7期35卷 178-182页

作者： Yun Wei Lei Zhou Wenbin Hu Liming Yang Guang Yang Chaoqiang Wang Hui Shi Fei Han Yufa Feng Xuan Ding Penghui Shao Xubiao Luo National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China School of Life Science Jinggangshan UniversityJi’an 343009China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Biomass Molecular Engineering Center and Anhui Provincial Key Laboratory of Microbial Pest Control Anhui Agricultural UniversityHefei 230036China Jiangxi Ganfeng Recycling Technology Co.LTD. Xinyu 338004China

The efficient and environmentally friendly recycling technology of waste residue that including abundant heavy metal produced during the recovery of lithium batteries has become a research ***,a novelty process of acid leaching-selective electrodeposition-deep impurity removal-regeneration was proposed to recovery of the CuS slag,which has been efficient transferred to high purity cathode copper and commercially available ternary *** cathode with a purity of 99.67%was prepared under electrochemical reaction conditions at-0.55 V for 2 h.A novel impurity remover-Mn powder,which was used to remove the residual impurities and as a feedstock for the ternary ***,NCM523 was regenerated by *** process is superior to the traditional process in economy,energy consumption,CO_(2)emissions,product purity and process *** study provides a new approach for solid waste recovery and precious metal enrichment.

关键词： CuS slag Electrodeposition Cathode copper Ternary precursor Solid waste recovery

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SAND: semi-automated adaptive network defense via programmable rule generation and deployment

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Science China(Information Sciences) 2022年第7期65卷 121-138页

作者： Haoyu CHEN Deqing ZOU Hai JIN Shouhuai XU Bin YUAN National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabCluster and Grid Computing Lab School of Computer Science and TechnologyHuazhong University of Science and Technology National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabHubei Engineering Research Center on Big Data Security School of Cyber Science and EngineeringHuazhong University of Science and Technology Department of Computer Science University of Colorado at Colorado Springs

Cyber security is dynamic as defenders often need to adapt their defense postures. The state-ofthe-art is that the adaptation of network defense is done manually(i.e., tedious and error-prone). The ideal solution is to automate adaptive network defense, which is however a difficult problem. As a first step towards automation, we propose investigating how to attain semi-automated adaptive network defense(SAND). We propose an approach extending the architecture of software-defined networking, which is centered on providing defenders with the capability to program the generation and deployment of dynamic defense rules enforced by network defense tools. We present the design and implementation of SAND, as well as the evaluation of the prototype implementation. Experimental results show that SAND can achieve agile and effective dynamic adaptations of defense rules(less than 15 ms on average for each operation), while only incurring a small performance overhead.

关键词： network defense adaptive defense automated defense programmable defense security services software-defined networking security management

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Carbonitride MXene Ti_(3)CN(OH)_(x)@MoS_(2)hybrids as efficient electrocatalyst for enhanced hydrogen evolution

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Nano research 2023年第4期16卷 4656-4663页

作者： Jizhou Jiang Fangyi Li Saishuai Bai Yongjing Wang Kun Xiang Haitao Wang Jing Zou Jyh-Ping Hsu School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China Department of Chemical Engineering “National Taiwan University”Taipei 10617

Renewable energy powered electrocatalytic water splitting is a promising strategy for hydrogen generation,and the design and development of high-efficiency and earth-abundant electrocatalysts for hydrogen evolution reaction(HER)are highly ***,MoS2 nanoflowers decorated two-dimensional carbonitride-based MXene Ti3CN(OH)x hybrids have been constructed by etching and post-hydrothermal *** electrochemical performance of the as-obtained Ti_(3)CN(OH)_(x)@MoS_(2)hybrids having a quasi core-shell structure is fascinating:An overpotential of 120 mV and a Tafel slope of 64 mV∙dec^(−1)can be delivered at a current density of 10 mA∙cm^(−2).And after 3,000 cyclic voltammetry cycles,it can be seen that there is no apparent *** the experimental results and density functional theory(DFT)calculations indicate that the synergetic effects between Ti_(3)CN(OH)x and MoS_(2)are responsible for the robust electrochemical HER *** electrons of-OH group in Ti_(3)CN(OH)x are transferred to MoS_(2),making the adsorption energy of the composite for H almost *** metallic Ti_(3)CN(OH)x is also beneficial to the fast charge transfer *** construction of MXene-based hybrids with optimal electronic structure and unique morphology tailored to the applications can be further used in other promising energy storage and conversion devices.

关键词： Ti_(3)CN(OH)x MoS_(2) hydrogen evolution reaction density functional theory(DFT)calculations

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ModelDefenders: A novel gamified mutation testing game for model-driven engineering 16

ModelDefenders: A novel gamified mutation testing game for m...

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16th IFIP WG 8.1 Working Conference on the Practice of Enterprise Modeling, EDEWC 2023

作者： Cammaerts, Felix Snoeck, Monique Research Center for Information System Engineering Leuven KU Belgium

Recently, there has been a surge in Model-Driven engineering (MDE), where code is automatically generated from a model. While this has certainly enabled non-technical people to become something of a programmer, it doesn’t necessarily make them good testers or good modelers. In mutation testing syntactic variations (mutants) are created from the source code and run against a test suite. Mutants that pass all the test cases in the suite are called alive, while mutants that fail are called dead. Good testers are able to develop test suites that kill all mutants. This can also be applied to MDE, where the mutants are created on the models used for code generation. This paper presents a gamified approach for mutation testing on models and discusses the specific challenges and caveats encountered when defining mutants and setting up such a gamified approach. © 2023 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

关键词： Software testing

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Oxygen vacancies coupled with surface silicide facilitate CO2 activation at near-room temperature for efficient methane productivity on Ni-oxide supported Pd nanoparticles

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Sustainable Energy and Fuels 2024年第15期8卷 3399-3411页

作者： Yang, Thomas Beniwal, Amisha Bhalothia, Dinesh Yan, Che Wang, Chia-Hsin Chen, Tsan-Yao Department of Engineering and System Science National Tsing Hua University Hsinchu30013 Taiwan National Synchrotron Radiation Research Center Hsinchu30076 Taiwan

The catalytic conversion of carbon dioxide (CO2) into valuable commodities such as methane (CH4) via CO2 methanation stands as a promising avenue for addressing both energy and environmental challenges. Considering the exothermic nature of the CO2 methanation reaction, low temperature is beneficial for high CH4 productivity. However, the high stability of linear CO2 molecules demands highly active catalysts for activation at low temperatures. In response, we have developed binary catalysts comprising tetrahedral symmetric Ni-oxide-supported Pd nanoparticles with a surface coating of silicide (NiOTPdX-T, X = Pd/Ni ratio). The as-prepared NiOTPdX-T catalyst with a Pd/Ni ratio of 1.5 (hereafter denoted as NiOTPd15-T) initiates CO2 methanation at an unprecedentedly low temperature of 50 °C with 100% CH4 selectivity and achieves an outstanding CH4 productivity of ∼6858 mmol g−1 h−1 at 300 °C temperature, surpassing its monometallic counterparts (NiOT-T (∼3899 mmol g−1 h−1) and Pd-T (∼331 mmol g−1 h−1)) by several fold. With insights from comprehensive physical and electrochemical investigations along with ambient pressure X-ray photoelectron spectroscopy (APXPS) observations, we demonstrated that the remarkably high CH4 productivity of the NiOTPd15-T catalyst originates from the local cooperation between oxygen vacancies (OV)s in the Ni-oxide support, surface silicide and adjacent Pd nanoparticles. During CO2 conversion, the OVs and surface silicide facilitate CO2 activation, while Pd nanoparticles and metallic Ni domains promote hydrogen splitting. We envision that the obtained results will open new perspectives for designing high-performance catalysts possessing multiple active sites for the CO2 reduction reaction. © 2024 The Royal Society of Chemistry.

关键词： Carbon dioxide

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NO reduction by carbon-based gases based on coal gasification fractions:NO reduction intermediate identification and kinetic analysis

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Frontiers of Environmental Science & engineering 2025年第3期19卷 175-189页

作者： Xiang Zhang Jian Tian Tanghui Hu Guangyong Yue Xianlong Liu Wen Zhou Xiaohong Liu Xinye Wang Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Engineering Research Center for Green Industrialization Technology of Industrial WasteSchool of Materials Science and EngineeringHubei UniversityWuhan 430062China Hubei Huda Tianshu New Energy Materials Industrial Research and Design Institute Co. Ltd.Wuhan 430062China Wuhan Tianshu Dust Removal Equipment Co. Ltd.Wuhan 430062China Engineering Laboratory for Energy System Process Conversion&Emission Control Technology of Jiangsu Province School of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing 210042China

Combining pulverized coal gasifiers with cement kiln production is promising for application in low-cost and efficient NO *** paper presents a pulverized coal gasifier catalytic denitration technique and investigates the homogeneous reduction(by CO and CH_(4))and heterogeneous catalytic reduction(by coke,CaO,MgO,and Fe_(2)O_(3))of NO.A combination of Chemkin simulations and fixed-bed experiments is used to elucidate the reaction pathways and key intermediates of NO reduction by carbon-based *** addition,the activation energies for different catalyst combinations were analyzed via reaction *** results demonstrate that the presence of small amounts of O_(2) inhibits NO reduction by CO but promotes NO reduction by CH_(4).The NCO·radical is essential for the NO reduction process,and the generation of this radical depends on the CH_(4) cleavage intermediate and O·*** and Fe_(2)O_(3) exhibit more significant catalytic effects on NO reduction by carbon-based gases than the other catalysts *** presence of a small amount of O_(2) in the reacting gas mixtures facilitates the NO reduction *** activation energy is reduced to 1.02 kJ/mol,and the NO conversion reaches 99.80%when the catalyst is C+CaO+MgO+Fe_(2)O_(3) and the gas composition is CO+CH_(4)+O_(2).This work provides theoretical support and data recommendations for the use of pulverized coal gasifiers for the denitrification of cement kilns.

关键词： Carbon-based gas Catalytic denitration Coke Kinetic analysis Reaction mechanism

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