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Thermal cycling creep properties of a directionally solidified superalloy DZ125

Journal of Materials science & technology 2022年第9期104卷 269-284页

作者： Wenrui An Satoshi Utada Xiaotong Guo Stoichko Antonov Weiwei Zheng Jonathan Cormier Qiang Feng Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Institut Pprime UPR CNRS 3346Department of Physics and Mechanics of MaterialsISAE-ENSMABP4010986961 Futuroscope Chasseneuil CedexFrance China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 510610China Department of Microstructure Physics and Alloy Design Max-Planck-Institut für Eisenforschung GmbHDüsseldorf 40237Germany

Aero-engine turbine blades may suffer overheating during service,which can result in severe microstructural and mechanical degradation within tens of *** this study,the thermal cycling creep under(950℃/15 min+1100℃/1 min)-100 MPa was performed on a directionally solidified superalloy,*** effects of overheating and thermal cycling on the creep properties were evaluated in terms of creep behavior and microstructural evolution against isothermally crept specimens under 950℃/100 MPa,950℃/270 MPa,and 1100℃/100 *** results indicated that the thermal cycling creep life was reduced dramatically compared to the isothermal creep under 950℃/100 *** plastic creep deformation mainly occurred during the overheating stage during the thermal cycling *** thermal cycling creep curve exhibited three stages,similar to the 1100℃isothermal creep,but its minimum creep rate occurred at a lower creep *** overheating events caused severe microstructural degradation,such as substantial dissolution ofγ'phase,earlier formation of raftedγ'microstructure,widening of theγchannels,and instability of the interfacial dislocation *** microstructural degradation was the main reason for the dramatic decrease in thermal cycling creep life,as the thermal cycling promoted more dislocations to cut intoγ'phase and more cracks to initiate at grain boundaries,carbides,and residual eutectic *** study underlines the importance of evaluating the thermal cycling creep properties of superalloys to be used as turbine blades and provides insights into the effect of thermal cycling on directionally solidified superalloys for component design.

关键词： Directional solidified superalloy Thermal cycling creep Overheating Creep properties Microstructural degradation

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Numerical Simulation of Harmonic Response Analysis for Small Out-Line Package

Numerical Simulation of Harmonic Response Analysis for Small...

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Software engineering, Social Network Analysis and Intelligent Computing (SSAIC), Asia-Pacific Conference on

作者： Hai Lin Xianshan Dong Wei Su Qinwen Huang Agam Tomar School of Mechanics and Construction Engineering Jinan University Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia Australia

ISBN: (数字)9798350393682

ISBN: (纸本)9798350393699

In order to discuss the influence of the number of sheets on acceleration and frequency curve of sample surface, the finite element model of clamp, SOP sample and metal sheet is firstly established with Solidworks. Different number of sheets are laid on the surface of SOP sample. Then changing the number of the paper sheets, harmonic response analysis is converted based on modal analysis. The influence of different number of sheet on acceleration and frequency curve is discussed. The results show the relation between acceleration-frequency curve of different thickness of paper, which provides reference for packaging design.

关键词： Solid modeling Social networking (online) Modal analysis Metals Packaging Harmonic analysis Numerical simulation

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Mechanisms underlying the interactions and adaptability of nitrogen removal microorganisms in freshwater sediments

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Advanced biotechnology 2024年第3期2卷 21页

作者： Dandan Zhang Huang Yu Xiaoli Yu Yuchun Yang Cheng Wang Kun Wu Mingyang Niu Jianguo He Zhili He Qingyun Yan Marine Synthetic Ecology Research Center Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Environmental Science and Engineering/Life Sciences/Ecology Guangdong Provincial Observation and Research Station for Marine Ranching in Lingdingyang Bay China-ASEAN Belt and Road Joint Laboratory On Mariculture Technology State Key Laboratory for Biocontrol Sun Yat-Sen University Zhuhai 519082 China. School of Resources Environment and Safety Engineering Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy University of South China Hengyang 421001 China. Marine Synthetic Ecology Research Center Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Environmental Science and Engineering/Life Sciences/Ecology Guangdong Provincial Observation and Research Station for Marine Ranching in Lingdingyang Bay China-ASEAN Belt and Road Joint Laboratory On Mariculture Technology State Key Laboratory for Biocontrol Sun Yat-Sen University Zhuhai 519082 China. yanqingyun@***.

Microorganisms in eutrophic water play a vital role in nitrogen (N) removal, which contributes significantly to the nutrient cycling and sustainability of eutrophic ecosystems. However, the mechanisms underlying the interactions and adaptation strategies of the N removal microorganisms in eutrophic ecosystems remain unclear. We thus analyzed field sediments collected from a eutrophic freshwater ecosystem, enriched the N removal microorganisms, examined their function and adaptability through amplicon, metagenome and metatranscriptome sequencing. We found that the N removal activities could be affected through potential competition and inhibition among microbial metabolic pathways. High-diversity microbial communities generally increased the abundance and expression of N removal functional genes. Further enrichment experiments showed that the enrichment of N removal microorganisms led to a development of simplified but more stable microbial communities, characterized by similar evolutionary patterns among N removal microorganisms, tighter interactions, and increased adaptability. Notably, the sustained provision of NH and NO during the enrichment could potentially strengthen the interconnections among denitrification, anaerobic ammonium oxidation (anammox) and dissimilatory nitrate reduction to ammonium (DNRA) processes. Moreover, the identification of shared metabolic traits among denitrification, anammox and DNRA implies important cooperative associations and adaptability of N removal microorganisms. Our findings highlight the microbial interactions affect the adaptive strategies of key microbial taxa involved in N removal.

关键词： Eutrophic ecosystems Metagenomics Metatranscriptomics Microbial function N removal microorganisms

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Recent advances in electrospun electrode materials for sodium-ion batteries

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Journal of Energy Chemistry 2021年第3期30卷 225-241页

作者： Yao Wang Yukun Liu Yongchang Liu Qiuyu Shen Chengcheng Chen Fangyuan Qiu Ping Li Lifang Jiao Xuanhui Qu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China China Electronic Product Reliability and Environmental Testing Research Institute(CEPREI) Guangzhou 510610GuangdongChina

Sodium-ion batteries(SIBs)have been considered as an ideal choice for the next generation large-scale energy storage applications owing to the rich sodium resources and the analogous working principle to that of lithium-ion batteries(LIBs).Nevertheless,the larger size and heavier mass of Na^(+)ion than those of Li^(+)ion often lead to sluggish reaction kinetics and inferior cycling life in SIBs compared to the LIB *** pursuit of promising electrode materials that can accommodate the rapid and stable Na-ion insertion/extraction is the key to promoting the development of SIBs toward a commercial ***-dimensional(1 D)nanomaterials demonstrate great prospects in boosting the rate and cycling performances because of their large active surface areas,high endurance for deformation stress,short ions diffusion channels,and oriented electrons transfer ***,as a versatile synthetic technology,features the advantages of controllable preparation,easy operation,and mass production,has been widely applied to fabricate the 1 D nanostructured electrode materials for *** this review,we comprehensively summarize the recent advances in the sodium-storage cathode and anode materials prepared by electrospinning,discuss the effects of modulating the spinning parameters on the materials’micro/nano-structures,and elucidate the structure-performance correlations of the tailored ***,the future directions to harvest more breakthroughs in electrospun Na-storage materials are pointed out.

关键词： Sodium-ion batteries Electrospinning Electrode materials Nanostructures Structure-performance correlations

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FINDGATE: Fine-grained Defect Prediction Based on a Heterogeneous Discrete Code Graph-guided Attention Transformer

FINDGATE: Fine-grained Defect Prediction Based on a Heteroge...

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IEEE International Conference on Software Quality, reliability and Security (QRS)

作者： Jiaxi Xu Ping Chen Banghu Yin Zhichang Huang Qiaochun Qiu China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou Guangdong China The Ministry of Industry and Information Technology Key Laboratory of Performance and Reliability Testing and Evaluation for Basic Software and Hardware Guangzhou Guangdong China College of System Engineering National University of Defense Technology Changsha Hunan China

Recognizing defects in source code through deep learning methods has become an important research subject for improving software quality. Although Transformer-based models such as CodeBERT have demonstrated impressive performance improvement in defect prediction tasks, models relying on single-structured input data, such as sequences, have limited ability to capture the code's structural features. Treating code simply as text overlooks essential information such as control dependencies, data dependencies, and syntactic structures inherent in the code. This paper proposes the Heterogeneous Discrete Code Graph (HDCG), which assigns structural information to code tokens from multiple perspectives. We also introduce an improved transformer model FINEGATE that leverages HDCG to guide self-attention. The experiments demonstrate that FINEGATE can effectively predict source code defects and perform fine-grained defect localization.

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Simulation and Experiment of Windage Power Loss of A Shrouded Spiral Bevel Gears under Oil Injection Lubrication

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Chinese Journal of Mechanical engineering 2025年第2期 413-432页

作者： Bo Li Kai Rong Xuyang Zhang Sanmin Wang U-Xuan Tan Xuanyuan Su Laifa Tao School of Mechanical Engineering Northwestern Polytechnical University Department of Engineering Product Development Singapore University of Technology and Design Hangzhou International Innovation Institute Beihang University National Key Laboratory of Science and Technology on Reliability and Environmental Engineering School of Reliability and Systems Engineering Beihang University

During high-speed rotation, the surface of aeronautic spiral bevel gears will generate significant pressure and viscous forces, which will cause a certain amount of windage power loss and reduce the efficiency of the transmission system. Based on the computational fluid dynamics, this paper analyzes the windage power loss of a single spiral bevel gear and a spiral bevel gear pair under oil injection lubrication. In addition, the shroud is used to suppress gear windage loss, and the clearance size and opening angle of the designed shroud are optimized. Finally, by comparing and analyzing the experimental results, the following conclusions were obtained:(1) For a single gear, the speed is the most important factor affecting windage loss, followed by the hand of spiral, and rotation direction;(2) For gear pairs, under oil injection lubrication, the input speed has the greatest impact on windage power loss, followed by the influence of oil injection port speed, temperature and oil injection port pressure;(3) Installing a shroud is an effective method to reduce windage power loss;(4) In the pure air phase, the smaller the clearance between the shroud and the gear surface, and the smaller the radial direction between the shroud and the shaft, the better the effect of reducing windage;(5) In the two-phase flow of oil and gas, it is necessary to design oil drainage holes on the shroud to ensure the smooth discharge of lubricating oil and improve the drag reduction effect.

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Sex-specific divergent responses of marine medaka (Oryzias melastigma) towards long-term benzo[a]pyrene exposure revealed stronger resilience and recoverability in female fish

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Chemosphere 2024年 364卷 143077页

作者： Zeb, Rabia Yin, Xiaohan Chen, Fangyi Wang, Ke-Jian State Key Laboratory of Marine Environmental Science College of Ocean & Earth Sciences Xiamen University Fujian Xiamen China State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology College of Ocean & Earth Sciences Xiamen University Fujian Xiamen China

Benzo[a]pyrene (BaP), a representative five-membered polycyclic aromatic hydrocarbon, has been extensively studied as a pollutant for decades. Despite this, sex-specific responses to BaP exposure remain poorly understood. This study employed a life-cycle exposure approach to investigate the effects of prolonged BaP exposure on marine medaka (Oryzias melastigma), highlighting sex-specific responses. After a 90-day exposure period, significant variations in biometric measurements and oxidative stress markers were observed between male and female fish. BaP exposure resulted in weak detoxification defense in males, while females exhibited an opposite response. Transcriptomic analysis revealed 13 significantly enriched pathways in males and 11 in females, with varying numbers of differentially expressed genes between the sexes, highlighting distinct biological responses. Host resistance assay showed higher mortality rates among BaP-exposed males, and suppressed immune gene expressions and lysozyme activity, while females demonstrated enhanced immune genes and lysozyme activity post-challenge, indicating a more resilient defense response. Furthermore, after a one-month depuration period following BaP exposure, male medaka demonstrated slower recoverability compared to females. These findings underscore sex-specific effects of BaP exposure on fish, with females displaying stronger resilience. Understanding these distinctions are crucial for accurately assessing the impact of environmental pollutants on the aquatic population and ecosystem maintenance. © 2024 Elsevier Ltd

关键词： Barium compounds

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The Effects of RF Power and Cavity Structure on the Plasma Discharge Characteristics of RPS

The Effects of RF Power and Cavity Structure on the Plasma D...

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Electronics and Devices, Computational science (ICEDCS), International Conference on

作者： Hai Lin Wei Su Ming Chen Renhuai Liu School of Mechanics and Construction Engineering Jinan University Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Guangzhou China

In this paper, a two-dimensional model of plasma diffusion in remote plasma source discharge chamber is established by COMSOL plasma module. The electron density and electron temperature distributions inside the discharge cavity were obtained by adjusting the thickness of alumina coating and the magnitude of RF power parameters. Based on the results, the authors discuss the effects of different alumina coating thickness and RF power on the electron density and electron temperature inside the discharge cavity, which provide theoretical guidance for the subsequent optimization of the internal structure of the discharge cavity and the discharge parameters.

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In-plane grain boundary induced defect state in hierarchical NiCo-LDH and effect on battery-type charge storage

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Nano Research 2023年第4期16卷 4908-4916页

作者： Jinjin Ban Xiaohan Wen Honghong Lei Guoqin Cao Xinhong Liu Chunyao Niu Guosheng Shao Junhua Hu School of Materials Science and Engineering Industrial Technology Research Institute of Resource and Materials of Henan ProvinceZhengzhou UniversityZhengzhou 450001China State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou University100 Kexue AvenueZhengzhou 450001China Henan Provincial Key Laboratory for Metal Fuel Battery Foguang Power Generation Equipment Co.Ltd50 Holly StreetZhengzhou 450000China International Laboratory for Quantum Functional Materials of Henan School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China

Domain boundaries are regarded as the effective active sites for electrochemical energy storage materials due to defects enrichment ***,layered double hydroxides(LDHs)tend to grow into single crystalline nano sheets due to their unique two-dimentional(2D)lattice ***,much efforts were made on the designing hierarchical structure to provide more exposed electroactive sites as well as accelerate the mass ***,we demonstrate a strategy to introduce low angle grain boundary(LAGB)in the flakes of Ni/Co layered double hydroxides(NiCo-LDHs).These defect-rich nano flakes were self-assembled into hydrangea-like spheres that further constructed hollow cage *** the formation of hierarchical structure and grain boundaries are interpreted with the synergistic effect of Ni2+/Co2+ratio in an“etching-growth”*** domain boundary defect also results in the preferential formation of oxygen vacancy(Vo).Additionally,density functional theory(DFT)calculation reveals that Co substitution is a critical factor for the formation of adjacent lattice defects,which contributes to the formation of domains *** fabricated battery-type Faradaic NiCo-LDH-2 electrode material exhibits significantly enhanced specific capacitance of 899 C·g^(−1)at a current density of 1 A·g^(−1).NiCo-LDH-2//AC asymmetric capacitor shows a maximum energy density of 101.1 Wh·kg^(−1)at the power density of 1.5 kW·kg^(−1).

关键词： sacrificial template grain boundary oxygen vacancy(Vo) hierarchical structure

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Gate Damage Mechanism of Schottky-Type p-GaN Gate HEMTs in Reverse Conduction Mode Under Surge Current Stress

Gate Damage Mechanism of Schottky-Type p-GaN Gate HEMTs in R...

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International Symposium on Power Semiconductor Devices and Ics (ISPSD)

作者： Xiaoming Wang Ruize Sun Yun Xia Chao Liu Xinghuan Chen Wanjun Chen Bo Zhang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China Institute of Electronic and Information Engineering of UESTC in Guangdong Dongguan China Shenzhen Pinghu Laboratory Shenzhen China China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China

ISBN: (数字)9798350394825

ISBN: (纸本)9798350394832

In this paper, the gate damage mechanism of Schottky-type p-GaN gate high electron mobility transistors (HEMTs) in reverse conduction mode under surge current stress is investigated. Single and repetitive stress experiments and mix-mode simulations are carried out. For the device subjected to the surge current exceeding the rated current, the gate-to-channel voltage is very high due to the self-heating effect. It will cause significant thermally-assisted tunneling of holes at the gate Schottky junction. Under a single stress with an extremely high current, the Schottky junction breakdown will occur, leading to the subsequent device burnout. Under the repetitive stress below the single failure current, new donor traps can be generated in the p-GaN layer, causing irreversible gate degradation. It is confirmed by C G -V G characteristics and recovery experiments.

关键词： Degradation Breakdown voltage Simulation Logic gates HEMTs Tunneling Surges

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