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9th International Conference on Advanced materials Research, ICAMR 2019

作者： Li, Boqiong Li, Chunlin Lu, Xing Department of Mechanical Engineering Jinzhong University Jinzhong030619 China Liaoning Key Materials Laboratory for Railway School of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China

ISBN: (纸本)9783035714845

Porous Ti-Nb-Ta-Zr alloys for biomedical applications were successfully fabricated by PM. The microstructure, cycle compressive and electrochemistry behavior were studied. It results that the porous structure of Ti-Nb-Ta-Zr with 0.8 GPa Young's modulus, 2.7% pseudoelastic strain ratio and -0.44 V corrosion potential in SBF, can be applied to the trabecular bone prosthesis or bone substitute for spinal vertebral body. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Microstructure

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Interface interactions during fabrication of aluminum alloy-alumina fiber composites

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Metallurgical Transactions A 1978年第5期9卷 697-711页

作者： Levi, C.G. Abbaschian, G.J. Mehrabian, R. Department of Metallurgy and Mining Engineering University of Illinois Urbana-Champaign Illinois United States Department of Materials Science and Engineering Pahlavi University Shiraz Iran Department of Metallurgy and Mining Engineering Department of Mechanical and Industrial Engineering University of Illinois Urbana-Champaign 61801 IL United States

The feasibility of fabricating fiber-reinforced aluminum alloys by addition of discontinuous fibers to vigorously agitated, partially solid metal slurries was investigated. In the first phase of the program, reported herein, emphasis was placed on the study of interface interactions between polycrystalline A1₂O₃ fibers and Al-2 to 8 pct Mg, Al-4.5 pct Cu and Al-4.5 pct Cu-1 to 2 pct Mg alloys. In general, it was observed that the incorporation of fibers could be readily achieved by this technique, and that fibers appeared wetted after a few minutes of contact with the melt. The composites produced exhibited an intimate, void free bond between the constituents. In addition, a region of significantly altered microstructure resulted from accumulation of oxide and/or aluminate particles which either formed within the melt and were attached to the moving fibers, or used the fiber surface as a substrate to grow on. Microscopic examination of this interaction zone and thermodynamic considerations indicate that it consists of fine α-Al₂O₃, aluminates, oxides of the alloying elements, and probably some intermetallic compounds. For example, it is shown that a stable MgAl₂O₄ spinel forms at the interface of A1₂O₃ fibers and Al-Mg alloys. Examination of composite specimens fractured under tension indicated that the interfaces produced were strong enough to permit the transfer of loads at strengths in the order of 250 to 350 MPa. © 1978 American Society for Metals and the Metallurgical Society of AIME.

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Overcoming the surface paradox: Buried perovskite quantum dots in wide-bandgap perovskite thin films

arXiv

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arXiv 2025年

作者： Zhang, Hao Pasha, Altaf Metcalf, Isaac Zhou, Jianlin Staunstrup, Mathias Zhu, Yunxuan Liao, Shusen Ssennyimba, Ken Chen, Jia-Shiang Reddy, Surya Prakash Thébaud, Simon Hou, Jin Shuai, Xinting Mandani, Faiz Sidhik, Siraj Jones, Matthew R. Ma, Xuedan Balakrishna, R. Geetha Susarla, Sandhya Ginger, David S. Katan, Claudine Kanatzidis, Mercouri G. Bawendi, Moungi G. Natelson, Douglas Tamarat, Philippe Lounis, Brahim Even, Jacky Mohite, Aditya D. Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Applied Physics Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Centre for Nano and Material Sciences Jain University Jain Global Campus Kanakapura Karnataka Bangalore562112 India Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Université de Bordeaux LP2N Talence France Institut d’Optique CNRS LP2N Talence France Department of Physics and Astronomy Rice University HoustonTX77005 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60439 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85281 United States UMR 6082 CNRS INSA de Rennes Rennes35708 France Department of Chemistry Rice University HoustonTX77005 United States Department of Chemistry University of Washington Box 351700 SeattleWA98195-1700 United States UMR 6226 Rennes35000 France Department of Chemistry Northwestern University EvanstonIL United States Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States

Colloidal perovskite quantum dots (PQDs) are an exciting platform for on-demand quantum, and classical optoelectronic and photonic devices. However, their potential success is limited by the extreme sensitivity and low stability arising from their weak intrinsic lattice bond energy and complex surface chemistry. Here we report a novel platform of buried perovskite quantum dots (b-PQDs) in a three-dimensional perovskite thin-film, fabricated using one-step, flash annealing, which overcomes surface related instabilities in colloidal perovskite dots. The b-PQDs demonstrate ultrabright and stable single-dot emission, with resolution-limited linewidths below 130 μeV, photon-antibunching (g2(0)=0.1), no blinking, suppressed spectral diffusion, and high photon count rates of 104/s, consistent with unity quantum yield. The ultrasharp linewidth resolves exciton fine-structures (dark and triplet excitons) and their dynamics under a magnetic field. Additionally, b-PQDs can be electrically driven to emit single photons with 1 meV linewidth and photon-antibunching (g2(0)=0.4). These results pave the way for on-chip, low-cost single-photon sources for next generation quantum optical communication and sensing. © 2025, CC BY.

关键词： Photons

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Real-time monitoring of fast gas dynamics with a single-molecule resolution by frequency-comb-referenced plasmonic phase spectroscopy

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PhotoniX 2024年第1期5卷 357-372页

作者： Duy-Anh Nguyen Dae Hee Kim Geon Ho Lee San Kim Dong-Chel Shin Jongkyoon Park Hak-Jong Choi Seung-Woo Kim Seungchul Kim Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Science TownDaejeon 34141South Korea Department of Mechatronic Engineering Faculty of Mechanical EngineeringHo Chi Minh City University of Technology(HCMUT)Vietnam National UniversityHo Chi Minh CityVietnam Department of Cogno-Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241South Korea Department of Optics and Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241South Korea School of Mechanical and Aerospace Engineering Nanyang Technological University(NTU)50 Nanyang AvenueSingapore 639798Singapore Institute of Machinery and Materials Nano-Convergence Mechanical Systems Research DivisionKorea156Gajeongbuk-RoYuseong-GuDaejeon 34103South Korea

Surface plasmon resonance(SPR)sensors are based on photon-excited surface charge density oscillations confined at metal-dielectric interfaces,which makes them highly sensitive to biological or chemical molecular bindings to functional metallic *** nanostructures further concentrate surface plasmons into a smaller area than the diffraction limit,thus strengthening photon-sample ***,plasmonic sensors based on intensity detection provide limited resolution with long acquisition time owing to their high vulnerability to environmental and instrumental ***,we demonstrate fast and precise detection of noble gas dynamics at single molecular resolution via frequency-comb-referenced plasmonic phase *** photon-sample interaction was enhanced by a factor of 3,852 than the physical sample thickness owing to plasmon resonance and thermophoresis-assisted optical confinement *** utilizing a sharp plasmonic phase slope and a high heterodyne information carrier,a small atomic-density modulation was clearly resolved at 5 Hz with a resolution of 0.06 Ar atoms per nano-hole(in 10^(11)RIU)in Allan deviation at 0.2 s;a faster motion up to 200 Hz was clearly *** fast and precise sensing technique can enable the in-depth analysis of fast fluid dynamics with the utmost resolution for a better understanding of biomedical,chemical,and physical events and interactions.

关键词： Frequency comb Nanohole array Single molecule detection Refractive index High resolution High speed Traceability to time standard

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Investigating effects of operational parameters on the rate of electrochemical cleaning of chromium deposits on strontium-doped lanthanum manganite cathodes in solid oxide fuel cells 17

Investigating effects of operational parameters on the rate ...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Sugimoto, Michelle Zhu, Zhikuan Gopalan, Srikanth Basu, Soumendra Pal, Uday B. Division of Materials Science and Engineering Boston University MA02215 United States Department of Mechanical Engineering Boston University MA02215 United States

ISBN: (纸本)9781607685395

Chromium poisoning of the cathode remains a significant obstacle to the stable long-term performance of solid oxide fuel cells. This study reports, a quick, in-situ mitigation method, called electrochemical cleaning. By applying a mild anodic bias, the electrochemical deposition reactions of chromium-containing species are reversed. Chromium vapor species are formed, freeing active electrochemical sites in the air electrode. An LSM/YSZbased cell was exposed to Cr vapors at 800 C and then subjected to electrochemical cleaning. Cell performance recovery was evidenced by current-voltage and EIS measurements. Chromium removal was verified using SEM and EDS analyses. The cyclability of the electrochemical cleaning was tested by repeated poisoning and cleaning of another cell. Investigation into the effect of cell operating parameters (current density and cell temperature) on the rate of cleaning is discussed. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Cathodes

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Quasi-static and fatigue bending behavior of naval composite joints

Quasi-static and fatigue bending behavior of naval composite...

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SAMPE '07: M and P - From Coast to Coast and Around the World

作者： Kyriakides, Steven A. Cook, Frederick P. Shah, Nandan Case, Scott W. Lesko, John J. Zhou, Aixi Peairs, Daniel M. Department of Materials Science and Engineering Virginia Tech. Blacksburg VA 24060 Department of Engineering Science and Mechanics Virginia Tech. Blacksburg VA 24060 Department of Mechanical Engineering Virginia Tech. Blacksburg VA 24060

ISBN: (纸本)1934551007

The increasing use of composite materials in naval structures has inspired new methods of joining these materials to themselves and to traditional structural materials. The strength and durability of these structures depends on the properties of these joints;for this experiment, the joint comprised a tapered reinforcement ("doubler") infused to a composite beam. These doubler joints are used to provide additional stiffness to areas that have sustained damage or may have high stress concentrations. A series of bending tests under static and fatigue loading conditions were performed on E-glass/vinyl ester composite beams with doubler joints. Samples were fabricated with and without pre-cracks at the doubler interface, as well as infusing some doubler joints during and some after the composite beam's infusion. The quasi-static load testing produced a linear dependence of bending strength with displacement at failure. The fatigue test results did not show any statistically significant difference in behavior between the uncracked secondary-bonded specimens and the 1/4" racked specimens. Additional double cantilever beam (DCB) experiments revealed that proper surface treatment can increase the strain energy release rate at the interface by 250% on average compared to no surface treatment. From these results, it is possible that the toughness of the interface was decreased by a lack of surface treatment, preventing the pre-cracks from having any significant impact on structural fatigue strength.

关键词： Joints (structural components)

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Development and validation of a coastal ocean forecasting system for Puerto Rico and the *** islands

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Journal of Ocean engineering and science 2018年第3期3卷 223-236页

作者： M.Solano M.Canals S.Leonardi Naval Research Laboratory Stennis Space Center MS 39529-5004 Center for Ocean Science and Engineering Department of engineering Sciences and MaterialsCaribbean Coastal Ocean Observing SystemUniversity of Puerto Rico at Mayaguez Dept.Mechanical Engineering The University of Texas at DallasTX USA

An ocean forecasting system has been developed for the coastal area of Puerto Rico and the *** *** paper presents the development and validation of the Puerto Rico Operational Regional Ocean Modeling System(PRO-ROMS)developed by the Caribbean Coastal Ocean Observing System(CARICOOS),which aims at improving currently available short-term forecasts of ocean currents for this region,and to resolve sub-mesoscale variability absent from the currently operational regional *** coastal ocean forecasting system is based on the Regional Ocean Modeling System(ROMS),and provides a 3-day forecast of ocean currents,water levels,temperature and *** and lateral boundary conditions are derived from the *** Oceanographic Office(NAVOCEANO)operational AmSeas forecasting system,a 3.6-km resolution application of the regional Navy Coastal Ocean Model(NCOM)that encompasses the Gulf of Mexico and Caribbean *** conditions are interpolated from the Navy’s Coupled Ocean-Atmosphere Mesoscale Prediction System(COAMPS)with the exception of surface stresses,which are computed from a 2-km application of the Weather Research and Forecasting(WRF)model used by National Centers for Environmental Protection’s(NCEP)National Digital Forecast Database(NDFD).Tidal variability is imposed using ROMS spectral forcing by specifying the harmonic phases and amplitudes from the TPXO global inverse tide solutions at the boundaries and sub-tidal conditions are imposed by filtering out high frequencies of barotropic variables from the lateral boundary conditions interpolated from *** results of sea surface height are validated with NOAA tide gauges,ocean currents are validated with Acoustic Doppler Current Profilers(ADCP)and High Frequency Radars(HFR).Computed statistics show improvement of the ocean current forecast in PRO-ROMS compared to AmSeas,especially at higher frequencies dominated by the tides and in small channels where the bathymetry is

关键词： Ocean modeling Operational oceanography Forecasting

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3D Modelling of Hydrogen Embrittlement in Austenitic Stainless Steel and Nickel-Based Superalloy: Physical metallurgy aspects on hydrogen entrapment

Physics Open

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Physics Open 2025年

作者： Behzad Sadeghi Pasquale Cavaliere Alicja Stanislawska Erich Schmid Institute of Materials Science Austrian Academy of Sciences Jahnstraße 12 A-8700 Leoben Austria Department of Innovation Engineering University of Salento Via per Arnesano 73100 Lecce Italy Process Metallurgy Research Unit Faculty of Technology University of Oulu 90570 Oulu Finland Department of Biomaterials Technology Institute of Manufacturing and Materials Technology Faculty of Mechanical Engineering&Ship Technology Gdansk University of Technology

This study explores the intricate relationship between hydrogen and the microstructural elements of austenitic stainless steels and nickel-based superalloys, with particular focus on their propensity for hydrogen embrittlement (HE). Utilizing sophisticated simulation tools within the ANSYS framework, we have developed an in-depth 3D model that intricately portrays the subtle hydrogen diffusion dynamics as they interact with microstructural features, including grain boundaries, dislocations, precipitates, and the lattice framework. This model illuminates the pivotal roles these microstructural interfaces play in the transportation and trapping of hydrogen and their contribution to the vulnerability of these alloys to HE. Our findings reveal that dislocations serve as a critical factor in dictating hydrogen diffusion behavior, which offer alternative pathways significantly influencing hydrogen distribution throughout the microstructure. The behavior of these dislocations is found to be highly temperature-sensitive, exhibiting distinct properties under varying thermal conditions and over extended durations. The simulation results are consistent with established models of hydrogen behavior in metallic systems and confirm that both microstructural nuances and temperature have a significant influence on hydrogen diffusion, which is in line with theoretical expectations. The insights gleaned from this research will assist in the engineering of materials that are more resilient to the deleterious effects of hydrogen penetration, thereby enhancing the safety and dependability of components operating in hydrogen-intensive environments.

关键词： Hydrogen Embrittlement 3D modeling physical aspects microstructural elements Steel Ni-based superalloy

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Deposition rates of EB-PVD TBC's on cylindrical surfaces

Deposition rates of EB-PVD TBC's on cylindrical surfaces

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26th Annual Conference on Composites, Advanced Ceramics, materials, and Structures: B

作者： Bernier, J.S. Weir, W.C.S. Fontecchio, M. Sisson Jr., R.D. Bose, S. Materials Science and Eng. Program Mechanical Engineering Dept Worcester Polytechnic Institute Worcester MA 01609 United States Materials and Processing Engineering Pratt and Whitney East Hartford CT 06108 United States

The coating thickness profiles for EB-PVD TBCs deposited on stationary cylinders have been experimentally measured and theoretically modeled using Knudsen's cosine law of emissions {1}. A comparison of the experimental results with the model reveals that the model needs to be modified to account for the sticking coefficient as well as a ricochet factor. These results are also discussed in terms of the effects of substrate temperature on the sticking coefficient, the ricochet factor, and coating density.

关键词： Thermal insulating materials

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A Study on the Performance Improvement of Axial Flux Permanent Magnet Machines Based on Stator and Rotor Design Modifications

A Study on the Performance Improvement of Axial Flux Permane...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Yun, Jangho Grainger, Brandon Ohodnicki, Paul University of Pittsburgh Department of Mechanical Engineering and Materials Science PittsburghPA United States University of Pittsburgh Department of Electrical and Computer Engineering PittsburghPA United States

ISBN: (纸本)9798350376067

Axial flux permanent magnet (AFPM) machines have technological competitiveness for electric propulsion systems that require compact structures and high-power density. However, challenging design and manufacturing problems that reduce the cost competitiveness cause designers to limit designable variables. In this paper, the effects of slot/pole combination, semi-closed slot, magnetic wedge, and segmented PM on performance in double-sided rotor and double-sided stator geometries designed with stator open slots were investigated through 3-D finite element analysis (FEA). FEA results show that the design variables have a significant impact on torque, torque ripple, and losses. Semi-closed slots or magnetic wedges reduce PM losses for each open slot model by more than 80%, significantly reducing losses compared to segmented PMs, and also reducing torque ripple. As an alternative to stator design modification, results indicate the open slot model can be considered with a slot/pole combination for low cogging torque to reduce torque ripple and segmented PMs to reduce PM losses. © 2024 IEEE.

关键词： Stators

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