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2024 Nuclear and Emerging Technologies for Space, NETS 2024

作者： Cheu, Darrell Shivprasasd, Aditya DeSalle, Christopher Wolfe, Douglas Materials Science and Technology Los Alamos National Laboratory Los AlamosNM87545 United States Department of Material Science and Engineering The Pennsylvania State University University ParkPA16802 United States

ISBN: (纸本)9780894487989

To reduce hydrogen loss in hydride moderators for next generation reactors, a hydrogen permeation barrier must be coated on the TZM cladding. To test the effectiveness of the barrier, a custom-built permeation system was built. Hydrogen permeabilities were measured using the differential pressure method where the upstream volume maintains a test pressure while the downstream pressure can either be measured directly with a pressure transducer. An uncoated TZM substrate was tested and confirmed to survive test conditions. © 2024 AMERICAN NUCLEAR SOCIETY. All rights reserved.

关键词： Permeation

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The Impact of Shoe Heel-Toe Drop on Plantar Pressure During the Third Trimester of Pregnancy 7

The Impact of Shoe Heel-Toe Drop on Plantar Pressure During ...

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7th International Conference on material Strength and Applied Mechanics, MSAM 2024

作者： Li, Xin Lu, Zhenghui Gao, Zixiang Shen, Siqin He, Yuqi Fekete, Gusztáv Kovács, András Gu, Yaodong Faculty of Sports Science Ningbo University Ningbo China Faculty of Engineering University of Pannonia Veszprém Hungary Department of Material Science and Technology Audi Hungaria Faculty of Automotive Engineering Széchenyi István University Hungary

ISBN: (纸本)9781643685472

Pregnancy induces various physiological adaptations to accommodate the growing fetus. Pregnant women commonly experience changes in gait, balance, and center of gravity, which may increase the risk of falls. This study investigates the effects of negative heel shoes on plantar pressure distribution during walking in third-trimester pregnant women. Twelve healthy primigravidas participated, wearing both flat shoes and negative heel shoes while walking. Plantar pressure data were collected using the Pedar-X® insole system. Results revealed that negative heel shoes significantly reduced maximum force in the medial forefoot regions compared to flat shoes, and the force-time integral only significantly decreased in the medial forefoot region. Wearing negative-heeled shoes resulted in an increase in peak force in the hallux region. The study suggests that modifying heel-toe drop in shoes can effectively mitigate plantar pressure during third-trimester pregnancy, reducing the risk of forefoot discomfort and potential injuries. Negative heel shoes could be beneficial for pregnant women, offering a solution to alleviate forefoot pressure and promote foot blood circulation during walking. However, further optimization is needed in the hallux region for negative heel shoes. © The Author(s), 2024.

关键词： Drops

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Research on Multi-Partial Discharge Source Location in Transformer Based on SA-PSO and Direction Finding Localization 4

Research on Multi-Partial Discharge Source Location in Trans...

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4th International Conference on Intelligent Power and Systems, ICIPS 2024

作者： Zhou, Yuxuan Liu, Yikang Luo, Richeng Wang, Yutong Elite Engineering School Changsha University of Science & Technology Changsha China State Grid Shaoyang Power Supply Company Material Management Department Shaoyang China School of Electrical Engineering and Information Engineering Changsha University of Science & Technology Changsha China

ISBN: (纸本)9798331532765

The traditional ultrasonic sensor time delay method can only locate the partial discharge (PD) source in the transformer for single point discharge, and the generation of PD is often multi-point simultaneous discharge. Therefore, this paper proposes a multi- PD source location method in transformer based on simulated annealing-particle swarm optimization (SA-PSO) algorithm and direction finding localization. Firstly, the SA-PSO algorithm is used to iteratively search the direction of arrival of the PD signal to improve the accuracy of direction of arrival (DOA) estimation. Secondly, a clustering search method is proposed to improve SA-PSO algorithm to deal with the initial particle population and solve the problem of multi-PD source optimization. In order to eliminate the false points in the case of multi-PD sources in the direction finding cross localization, a false positioning point removal method based on the principle of signal correlation is proposed. The simulation results show that the average error of the positioning method in this paper is 1 cm. Compared with the existing methods, this paper achieves a higher accuracy of multi-PD source positioning in transformer, which has theoretical reference and practical application value. © 2024 IEEE.

关键词： Simulated annealing

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Accelerating matrix/boundary precipitations to explore high-strength and high-ductile Co_(34)Cr_(32)Ni_(27)Al_(3.5)Ti_(3.5) multicomponent alloys through hot extrusion and annealing

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Journal of materials science & Technology 2023年第12期143卷 62-83页

作者： Xiaoming Liu Zongde Kou Ruitao Qu Weidong Song Yijia Gu Changshan Zhou Qingwei Gao Jiyao Zhang Chongde Cao Kaikai Song Vladislav Zadorozhnyy Zequn Zhang Jürgen Eckert Shenzhen Research Institute of Shandong University Shenzhen 518057China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China School of Material Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China Department of Materials Science and Engineering Missouri University of Science and TechnologyRollaMO 65409USA Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China National University of Science and Technology«MISIS» Moscow 119049Russia Erich Schmid Institute of Materials Science Austrian Academy of SciencesLeoben A-8700Austria Department of Materials Science Montanuniversität LeobenLeoben A-8700Austria

Annealing-regulated precipitation strengthening combined with cold-working is one of the most efficient strategies for resolving the conflict between strength and ductility in metals and ***,precipitation control and grain refinement are mutually contradictory due to the excellent phase stability of multicomponent *** work utilizes the high-temperature extrusion and annealing to optimize the microstructures and mechanical properties of the Co_(34)Cr_(32)Ni_(27)Al_(3.5)Ti_(3.5) multicomponent *** extrusion effectively reduces grain sizes and simultaneously accelerates the precipitation of coherent L12 nanoparticles inside the face-centered cubic(FCC)matrix and grain boundary precipitations(i.e.,submicron Cr-rich particles and L12-Ni 3(Ti,Al)precipitates),resulting in strongly reciprocal interaction between dislocation slip and hierarchical-scale *** annealing regulates grain sizes,dislocations,twins,and precipitates,further allowing to tailor mechanical *** high yield strength is attributed to the coupled precipitation strengthening effects from nanoscale coherent L12 particles inside grains and submicron grain boundary precipitates under the support of pre-existing *** excellent ductility results from the synergistic activation of dislocations,stacking faults,and twins during plastic *** present study provides a promising approach for regulat-ing microstructures,especially defects,and enhancing the mechanical properties of multicomponent alloys.

关键词： Multicomponent alloys Hot extrusion Microstructure Mechanical properties Precipitation strengthening

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Effects of friction stir processing and nano-hydroxyapatite on the microstructure,hardness,degradation rate and in-vitro bioactivity of WE43 alloy for biomedical applications

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Journal of Magnesium and Alloys 2024年第1期12卷 209-224页

作者： Bo Wu Farazila Yusof Fuguo Li Huan Miao A.R.Bushroa Mohd Ridha Bin Muhamad Irfan Anjum Badruddin Mahmoud Z.Ibrahim Department of Mechanical Engineering Faculty of EngineeringUniversiti MalayaKuala Lumpur 50603Malaysia Centre of Advanced Manufacturing and Material Processing(AMMP Centre) Universiti MalayaKuala Lumpur 50603Malaysia Center of Foundation studies in Science Universiti MalayaKuala Lumpur 50603Malaysia State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Mechanical Engineering Department College of EngineeringKing Khalid UniversityAbha 61421Saudi Arabia Design and Production Engineering Faculty of EngineeringAin Shams UniversityCairo 11517Egypt

Nowadays,magnesium alloys are emerging in biomedical implants for their similar properties to natural ***,the rapid degradation of magnesium alloys in biological media hinders successful *** of microstructure,as well as reinforcement particles can significantly improve the degradation *** this work,multi-pass friction stir processing(FSP)was proposed to synthesize WE43/nano-hydroxyapatite(n HA)surface composite,the microstructure,reinforced particle distribution,micro-hardness,corrosion behavior and in-vitro bioactivity were *** subsequent FSP passes of WE43 alloy and WE43/n HA composite refined the grain size which was reduced by 94.29%and 95.92%(2.63 and 1.88μm,respectively)compared to base metal after three *** resulted in increasing the microhardness by 120%(90.86 HV0.1)and 135%(105.59 HV0.1)for the WE43 and WE43-n HA,*** is found that increasing FSP passes improved the uniform distribution of n HA particles within the composite matrix which led to improved corrosion resistance and less degradation *** corrosion rate of the FSPed WE43/n HA composite after three passes was reduced by 38.2%(4.13 mm/year)and the degradation rate was reduced by 69.7%(2.87 mm/y).This is attributed to secondary phase(Mg24Y5and Mg41Nd5)particle fragmentation and redistribution,as well as a homogeneous distribution of n ***,the growing Ca-P and Mg(OH)2layer formed on the surface represented a protective layer that reduced the degradation *** wettability test revealed a relatively hydrophilic surface with water contact angle of 49.1±2.2°compared to 71.2±2.1°for base ***,biomineralization test showed that apatite layer grew after immersion 7d in simulated body fluid with atomic ratio of Ca/P 1.60 approaching the stoichiometric ratio(1.67)indicating superior bioactivity of FSPed WE43/n HA composite after three *** results raise that the grain refinement by FSP and introduction of n HA partic

关键词： Friction stir processing Magnesium-based composite Nano-hydroxyapatite Corrosion behavior In-vitro bioactivity

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Electronic and thermal properties of Ag-doped single crystal zinc oxide via laser-induced technique

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Chinese Physics B 2023年第6期32卷 44-51页

作者：邢欢王惠琼宋廷鲁李纯莉戴扬傅耿明康俊勇郑金成 Engineering Research Center of Micro-nano Optoelectronic Materials and Devices Ministry of EducationFujian Key Laboratory of Semiconductor Materials and ApplicationsCI Center for OSEDand Department of PhysicsXiamen UniversityXiamen 361005China Department of Physics and Department of New Energy Science and Engineering Xiamen University MalaysiaSepang 439000Malaysia Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China School of Material Science&Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemical Engineering School of Environmental and Chemical Engineeringand Institute for Sustainable EnergyShanghai UniversityShanghai 200444China

The doping of ZnO has attracted lots of attention because it is an important way to tune the properties of *** after growth is one of the efficient ***,we report a unique approach to successfully dope the single crystalline ZnO with Ag by the laser-induced method,which can effectively further post-treat grown *** sputtering was used to coat the Ag film with a thickness of about 50 nm on the single crystalline ***-doped yttrium aluminum garnet(Nd:YAG)laser was chosen to irradiate the Ag-capped ZnO samples,followed by annealing at700℃for two hours to form ZnO:*** three-dimensional(3D)information of the elemental distribution of Ag in ZnO was obtained through time-of-flight secondary ion mass spectrometry(TOF-SIMS).TOF-SIMS and core-level x-ray photoelectron spectroscopy(XPS)demonstrated that the Ag impurities could be effectively doped into single crystalline ZnO samples as deep as several hundred *** broadening of core level XPS profiles of Ag from the surface to depths of hundred nms was observed,indicating the variance of chemical state changes in laser-induced Ag-doped *** features of electronic mixing states were detected in the valence band XPS of ZnO:Ag,suggesting the strong coupling or interaction of Ag and ZnO in the sample rather than their simple *** Ag-doped ZnO also showed a narrower bandgap and a decrease in thermal diffusion coefficient compared to the pure ZnO,which would be beneficial to thermoelectric performance.

关键词： zinc oxide Ag-doping laser-induced technique XPS SIMS thermal diffusivity

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Mechanical properties and microstructure evolution of austenitic stainless-steel sheets, deformed at sub-zero temperatures

Journal of Alloys and Metallurgical Systems

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Journal of Alloys and Metallurgical Systems 2025年 9卷

作者： Krishnam Raju, M. Mahajan, Peeyush Kumar, Pavan Narasimhan, K. Department of Metallurgical Engineering and Material Science IIT Bombay India Department of Mechanical Engineering IIT Bombay India

Stainless steels are better than carbon steels for structural applications due to their optimal blend of strength, ductility, and corrosion resistance. Austenitic stainless steels, such as AISI304, are extensively utilized in cryogenic applications owing to their remarkable formability and corrosion resistance, even at sub-zero temperatures. In this study, the deformation behaviour of austenitic stainless steel (AISI304) sheet of thickness 1.2 mm was examined through tensile testing at room temperature (25°C) and sub-zero temperatures (0ºC, −40ºC, −80ºC, −120ºC) at strain rates such as 0.01 s−1,0.001 s−1,0.0001 s−1. Mechanical properties, microstructure, and texture evolution were analysed and interrelated across these temperature and strain rate conditions. Tensile strength exhibited an upward trend with decreasing temperature and strain rate, while yield strength decreased with decreasing strain rate and increased with lowering temperature. Microstructural changes indicated a phase transformation from parent austenite phase, with martensite fraction escalating alongside decreasing strain rate and temperature. Micro texture analysis revealed a rise in the fraction of the cube texture component corresponding to an increase in martensite fraction across materials deformed at varying temperatures and strain rates. This paper gives complete insight into the microstructure and the texture evolution during the uniaxial deformation of AISI 304 sheet at room temperature and at sub-zero temperatures. © 2024 The Authors

关键词： Austenitic stainless steel

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Effect of vacuum heat treatment on microstructure and corrosion behavior of HVOF sprayed AICoCrFeNiCu high entropy alloy

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Journal of Iron and Steel Research International 2023年第8期30卷 1550-1561页

作者： Yong-kuan Zhou l Jia-jie Kang Guo Jin Xiu-fang Cui Jie Zhang Guo-zheng Ma Zhi-qiang Fu Li-na Zhu Ding-shun She Yu-yun Yang School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100JiangsuChina Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou 451283HenanChina College of Material Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001HeilongjiangChina Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK National Key Lab for Remanufacturing Academy of Armored Forces EngineeringBeijing 100072China

To improve the corrosion resistance of coalbed methane drilling equipment,an AICoCrFeNiCu high entropy alloy coating was prepared on the AISI 4135(35CrMo)steel substrate by high velocity oxygen fuel(HVOF)technology,and the coating was subjected to vacuum heat treatment(VHT)at different temperatures(500,700,900 and 1100℃).The corrosion test of the substrate and the coatings after VHT in coalbed methane drilling fluid was carried *** results show that the HVOF sprayed AICoCrFeNiCu high entropy alloy(HEA)coating has a good bonding with the substrate,and the porosity of the coating is about 2.4%.There is partial segregation in the coating,and the coating mainly consists of body-centered cubic *** coating has good thermal stability,and the phase structure and microstructure of the coatings have changed after VHT at different *** with the substrate,the as-sprayed coating has better uniform corrosion resistance,and the corrosion resistance of the coating after VHT is further *** VHT at 500℃,the HVOF-sprayed AICoCrFeNiCu HEA coating has the best corrosion resistance.

关键词： High velocity oxygen fuel AICoCrFeNiCu high entropy alloy coating Vacuum heat treatment Microstructure Corrosion

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Grain-refining Co_(0.85)Se@CNT cathode catalyst with promoted Li_(2)O_(2)growth kinetics for lithium-oxygen batteries

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Chinese Chemical Letters 2024年第12期35卷 304-310页

作者： Ruonan Yang Jiajia Li Dongmei Zhang Xiuqi Zhang Xia Li Han Yu Zhanhu Guo Chuanxin Hou Gang Lian Feng Dang School of Materials Science&Engineering State Key Laboratory of Crystal MaterialsShandong UniversityJi’nan 250061China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUnited Kingdom School of Environmental and Material Engineering Yantai UniversityYantai 264005China

Highly active cathode catalysts for efficient formation/decomposition of Li_(2)O_(2)are essential for the performance improvement of lithium-oxygen batteries(LOBs).In this study,a grain-refining Co_(0.85)Se catalyst with a lattice spacing of 2.69 A of(101)plane closely matching with the(100)plane(2.72A)of Li_(2)O_(2)was applied for high-performance ***(101)plane exposed Co_(0.85)Se@CNT was synthesized by a simple one-pot hydrothermal *** Co_(0.85)Se with the lattice matching effect not only led to the efficient conversion and polarized growth of Li_(2)O_(2),but also prevented the formation of *** functional theory(DFT)calculations reveal that Co_(0.85)Se(101)plane has the intrinsic catalytic ability to generate/decompose Li_(2)O_(2)during ORR/OER process,due to its homogeneous electron distribution,suitable adsorption energy,and promoted Li_(2)O_(2)growth *** a consequence,the(101)plane highly exposed Co_(0.85)Se@CNT-80 electrode exhibited remarkable cycle stability over 2400 h at 100 mA/g and 290cycles at 500 mA/g,which is about 2 times longer than other electrodes.

关键词： Lithium-oxygen batteries Co_(0.85)Se@CNT Cathode catalysts Grain-refiner DFT calculation

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An Immune-Inspired Approach with Interval Allocation in Solving Multimodal Multi-Objective Optimization Problems with Local Pareto Sets

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Computers, materials & Continua 2024年第6期79卷 4237-4257页

作者： Weiwei Zhang Jiaqiang Li Chao Wang Meng Li Zhi Rao College of Computer Science and Technology Zhengzhou University of Light IndustryZhengzhou450001China Technology Research and Development Center Jilin Tobacco Industry Company LimitedChangchun130031China College of Tobacco Science and Engineering Zhengzhou University of Light IndustryZhengzhou450001China Raw Material Department Hongyun Honghe Tobacco(Group)CompanyKunming650202China

In practical engineering,multi-objective optimization often encounters situations where multiple Pareto sets(PS)in the decision space correspond to the same Pareto front(PF)in the objective space,known as Multi-Modal Multi-Objective Optimization Problems(MMOP).Locating multiple equivalent global PSs poses a significant challenge in real-world applications,especially considering the existence of local *** identifying and locating both global and local PSs is a major *** tackle this issue,we introduce an immune-inspired reproduction strategy designed to produce more offspring in less crowded,promising regions and regulate the number of offspring in areas that have been thoroughly *** approach achieves a balanced trade-off between exploration and ***,we present an interval allocation strategy that adaptively assigns fitness levels to each *** strategy ensures a broader survival margin for solutions in their initial stages and progressively amplifies the differences in individual fitness values as the population matures,thus fostering better population ***,we incorporate a multi-population mechanism that precisely manages each subpopulation through the interval allocation strategy,ensuring the preservation of both global and local *** results on 21 test problems,encompassing both global and local PSs,are compared with eight state-of-the-art multimodal multi-objective optimization *** results demonstrate the effectiveness of our proposed algorithm in simultaneously identifying global Pareto sets and locally high-quality PSs.

关键词： Multimodal multi-objective optimization problem local PSs immune-inspired reproduction

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