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2024 Laser science, LS 2024

作者： Bartos, Jan Ba Tis, Taleb Park, Wounjhang Huang, Shu-Wei Department of Electrical Computer and Energy Engineering University of Colorado Boulder80309 United States Material Science and Engineering Program University of Colorado Boulder80309 United States

We present progress towards an imaging magnetometer using a magneto-optical polymer nanocomposite thin film, experimentally demonstrating 29nT/√Hz sensitivity with © 2024 The Author(s). © Optica Publishing ... 详细信息

关键词： Heterodyne detection

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High Fidelity CFD Verification Workshop 2024 Test Case: Transonic Turbulent Flow in Sajben Diffuser

High Fidelity CFD Verification Workshop 2024 Test Case: Tran...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Qian, Xuehui Agarwal, Ramesh K. Dept. of Mechanical Engineering & Material Science Washington University in St. Louis St. LouisMO63130 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

To assess the performance of the newly developed one-equation Wray-Agarwal (WA) turbulence model, two test cases of transonic flow in the Sajben diffuser with different outlet pressures are studied. A normal shock appears and induces a flow separation on the diffuser wall due to the shock/boundary layer interaction. The experimental data for both the cases is available, which makes it possible to evaluate the WA model’s capability in predicting the pressure distributions on the diffuser walls. Two well-known models namely the Spalart-Allmaras (SA) one-equation model and the shear stress transport (SST) k-ω model are also employed for comparison. The results indicate that all the three models can predict the pressure distribution but prediction of the shock positions a little shifted towards downstream compared to the experiment. The Wray-Agarwal model shows higher accuracy in the prediction of the shock position and the flow field inside the diffuser. However, it shows relatively poor prediction of the pressure distribution in the flow downstream of the shock for the case with lower outlet pressure. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Flow separation

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Macroporous Directed and Interconnected Carbon Architectures Endow Amorphous Silicon Nanodots as Low‑Strain and Fast‑Charging Anode for Lithium‑Ion Batteries

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Nano-Micro Letters 2024年第5期16卷 333-351页

作者： Zhenwei Li Meisheng Han Peilun Yu Junsheng Lin Jie Yu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Engineering Lab for Supercapacitor MaterialsSchool of Material Science and EngineeringHarbin Institute of TechnologyShenzhenUniversity TownShenzhen 518055People’s Republic of China Songshan Lake Materials Laboratory Dongguan Dongguan 523808GuangdongPeople’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

Fabricating low-strain and fast-charging silicon-carbon composite anodes is highly desired but remains a huge challenge for lithium-ion ***,we report a unique silicon-carbon composite fabricated by uniformly dis-persing amorphous Si nanodots(SiNDs)in carbon nanospheres(SiNDs/C)that are welded on the wall of the macroporous carbon framework(MPCF)by vertical graphene(VG),labeled as MPCF@VG@SiNDs/*** high dispersity and amor-phous features of ultrasmall SiNDs(~0.7 nm),the flexible and directed electron/Li+transport channels of VG,and the MPCF impart the MPCF@VG@SiNDs/C more lithium storage sites,rapid Li+transport path,and unique low-strain property during Li+***,the MPCF@VG@SiNDs/C exhibits high cycle stability(1301.4 mAh g^(-1) at 1 A g^(-1) after 1000 cycles without apparent decay)and high rate capacity(910.3 mAh g^(-1),20 A g^(-1))in half cells based on industrial electrode *** assembled pouch full cell delivers a high energy density(1694.0 Wh L^(-1);602.8 Wh kg^(-1))and an excellent fast-charging capability(498.5 Wh kg^(-1),charging for 16.8 min at 3 C).This study opens new possibilities for preparing advanced silicon-carbon com-posite anodes for practical applications.

关键词： Amorphous Si nanodots Low-strain Fast-charging Lithium-ion batteries

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Enhancing the tensile properties of laser repairing Ti-6Al-4V alloys:Optimization of strain distribution based on composition fine-turning

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Journal of materials science & Technology 2024年第34期201卷 1-11页

作者： Hengxin Zhang Geng Wang Sen Yang Nan Wang Konda Gokuldoss Prashanth Zimeng Ye Kexin Zhao Fengying Zhang Hua Tan School of Material Science and Engineering Chang’an UniversityXi’an 710064PR China Beijing Institute of Remote Sensing Equipment Beijing 100854PR China Tallinn University of Technology Department of Mechanical and Industrial EngineeringEhitajate tee 519086 TallinnEstonia State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072PR China

In the context of laser repairing damaged forging titanium(Ti)alloys,a common challenge is the sig-nificant reduction in elongation of the repaired samples compared to that of the *** this work,directed energy deposition(DED)technology was employed to repair the TC4(Ti-6Al-4V)forgings by ma-nipulating the Al and V contents of the repaired zone(RZ).Subsequent evaluation encompassed the mi-crostructure,microhardness,and tensile properties across the laser repair deposition samples(LRDs).The results revealed that despite the LRD TC4-0Ti’s strength reaching 97.80%of the substrate,its elongation is only 43.93%of the *** appropriately reducing the Al and V contents of RZ,the LRD TC4-5Ti demonstrates a strength of 935.04 MPa and an elongation of 14.59%,achieving 98.70%and 82.38%of the substrate,*** the Al and V contents of RZ are further decreased,the strength of the LRDs gradually diminishes,falling below the forging *** digital image correlation(DIC)technology,the deformation behavior of different zones during the tensile process of these LDRs was *** results indicated a concentration of strain distribution within either RZ or the substrate zone(SZ)of the LRDs during the tensile process,which signifies the mismatch of deformation capacity between these two ***,the tensile properties of the LRDs were adversely *** judiciously adjusting the Al and V contents of RZ,the abovementioned mismatch phenomenon can be ameliorated,which facilitates a synergistic strain behavior between SZ and RZ during the tensile process,aiding in the homogenization of strain distribution and consequently enhancing the tensile properties of the LRDs.

关键词： Titanium alloy Laser repair deposition Digital image correlation Strain behavior Tensile properties

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Exposure of Glass Fiber on Behaviour of Epoxy/Flax Fiber Hybrid Composite Made Through Injection Mould Route

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Journal of The Institution of Engineers (India): Series D 2024年 1-5页

作者： Aruna, M. Devanathan, C. Chandramohan, P. Manivannan, S. Kumar, M. Vignesh Kumar, A. Venkatesh, R. Kaliyaperumal, P. Gopal Department of Industrial Management Faculty of Business Liwa College Abu Dhabi United Arab Emirates Department of Mechanical Engineering Rajalakshmi Engineering College Tamilnadu Chennai602105 India Department of Mechatronics Rajalakshmi Engineering College Tamilnadu Chennai602105 India Department of Mechanical Engineering Centre for Material Science Karpagam Academy of Higher Education Tamilnadu Coimbatore641021 India Department of Mechanical Engineering KCG College of Technology Tamilnadu Chennai600097 India Department of Civil Engineering RVS Technical Campus Tamilnadu Coimbatore641402 India Tamilnadu Chennai602105 India Department of Mechanical Engineering New Horizon College of Engineering Karnataka Bangalore560103 India

Polymer composites are beneficial over traditional materials and have been found to have distinct behaviour reasons, and it is used in lightweight applications including automotive and construction. However, natural fiber-made composites are found to lack quality, resulting in major variations in behaviour. The main theme of the current investigation is to develop the hybrid epoxy/flax composite featured with 0, 5, 10, and 15 weight percentages (wt%) of glass fiber via an advanced injection mould route. The synthesized composites of epoxy/10 wt% of flax/0–15 wtt% glass fiber are involved in tensile, flexural and impact strength behaviour studies and followed by ASTM standards like D3039, D790, and D256, respectively. The evaluated results are compared, and it spotted the composite contains 10wt% flax natural fiber/15 wt% of glass synthetic fiber exposed superior tensile/flexural and impact strength, and its values are 56 MPa, 52 MPa, and 6.8 J/mm2, respectively. © The Institution of Engineers (India) 2024.

关键词： Glass fibers

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Research on Fast Homing Method in Automatic Production Line 8

Research on Fast Homing Method in Automatic Production Line

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2022 8th International Forum on Manufacturing Technology and engineering materials, IFEMMT 2022

作者： Wang, Hai Li, Yanjuan Mechanical Engineering Shenyang Ligong University Liaoning110159 China Material Science & Engineering Shenyang Ligong University Liaoning110159 China

Homing is a particularly important step to establish the equipment coordinate origin. A reliable method of fast homing based on the PLC system in the automatic production line is discussed, which obtains the position information of each motion axis through Modbus or other networks, and cooperates with PLC's Homing instruction to static home quickly to avoid complex operations. And the function of returning to the breakpoint in the middle process is proposed, which makes it easy to resume production in the event of power failure or overload, and greatly improves production efficiency. And the above research is transformed into a practical system, which has been verified and has the value of promotion. © Published under licence by IOP Publishing Ltd.

关键词： Production efficiency

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Study on the Relationship Between Vibration Signals in CFRP Grinding and Grinding Mechanism

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Chinese Journal of mechanical engineering 2024年第6期37卷 334-345页

作者： Lichen Li Fangyuan Wang Pengda Song Kai Jin Lei Chu Sansan Ding Guido A.Berti Luca Quagliato College of Material Science and Technology Ocean University of ChinaQingdao 266404China CRRC Qingdao Sifang Locomotive&Rolling Stock Co. Ltd.Qingdao 266111China Department of Management and Engineering University of Padua36100 VicenzaItaly Division of Mechanical and Biomedical Engineering Ewha Womans UniversitySeoul 03760Republic of Korea

In the process of grinding carbon fiber reinforced polymer(CFRP),the changing state of acceleration vibration signal is closely related to the grinding surface ***,the time domain and frequency domain signal changes in acceleration can be used to monitor and control the grinding process to improve machining quality and *** this paper,changes in acceleration frequency domain signals under different grinding angles are studied,and the relationship between the vibration forms of acceleration frequency domain signals at the beginning,middle and end of grinding as well as the surface morphology and quality of the corresponding grinding position is *** with the micro-morphology of the grinding area,it can be seen that,a high frequency and low amplitude vibration can improve the grinding surface quality,but a high amplitude will have a negative impact on the grinding *** acceleration vibration during grinding is more stable and the corresponding surface quality is *** an increase in grinding angle,the maximum amplitude of acceleration first increases and then *** length of the surface fiber also initially decreases and then ***,the resin residue first increases and then *** purpose of this study is to provide a theoretical basis for the subsequent grinding state adjustment.

关键词： CFRP Grinding mechanism Acceleration signal Roughness

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Enhanced mechanical properties of Mg-3Al-1Zn alloy sheets through slope extrusion

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International Journal of Minerals,Metallurgy and materials 2022年第7期29卷 1343-1350页

作者： Huabao Yang Yanfu Chai Bin Jiang Chao He Junjie He Qingshan Yang Ming Yuan School of Mechanical and Electrical Engineering Shaoxing UniversityShaoxing 312000China Tianjin Key Laboratory of Composite&Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China College of Materials Science and Engineering Yunnan UniversityKunming 650091China School of Metallurgy and Material Engineering Chongqing University of Science and TechnologyChongqing 401331China

A novel extrusion approach,entitled slope extrusion(SE),was employed to manufacture AZ31(Mg-3Al-1 Zn,wt%)alloy *** microstructures,textures,and mechanical properties were investigated,compared with those of the AZ31 sheet fabricated by conventional extrusion(CE).Through the combination of finite element simulation and actual experiment,the ultimate results indicated that significant grain refinement(from 9.1 to 7.7 and 5.6μm)and strong basal texture(from 12.6 to 17.6 and 19.5 mrd)were achieved by the SE *** essence was associated with the additional introduced inclined interface in the process of SE,which could bring about more asymmetric deformation and stronger accumulated strain along the ND when compared with the process of *** a consequence,the SE sheets exhibited a higher yield strength(YS)and ultimate tensile strength(UTS)than the counterparts of the CE sheet,which was mainly assigned to the synergistic effects from grain refining and texture strengthening.

关键词： AZ31 Mg alloy sheets slope extrusion microstructure texture strength

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Fabrication and Characterization of Willemite Scaffolds Using Corn Stalk as a Novel Bio Template for Bone Tissue engineering Applications

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Journal of Bionic engineering 2023年第1期20卷 16-29页

作者： Zahra Yahay Seyed Mehdi Mirhadi Fariborz Tavangarian Department of Cellular Biotechnology Cell Science Research CenterRoyan Institute for BiotechnologyACECRIsfahan81593-58686Iran Department of Materials Engineering Shahreza BranchIslamic Azad UniversityShahrezaIsfahan86145-311Iran Mechanical Engineering Program School of ScienceEngineering and TechnologyPennsylvania State UniversityHarrisburgMiddletownPA17057USA

In this paper,we used Corn Stalk(CS)as a renewable and economical bio template to fabricate willemite scaffolds with the potential application in skull bone *** was used as a sacrificial template to synthesize the *** scaffolds with the chemical formula of Zn2SiO4 and pore size in the range of 3 to 10µm could be successfully synthesized by soaking CS in the willemite solution for 24 h and sintering at 950°C for 5 *** porosity of the samples was controlled by the soaking time(between 12 and 48 h)in the willemite solution from 5 to 35%,*** properties of these scaffolds showed a good approximation with cranial bone *** addition,cytotoxicity assays(MTT)were performed on Human Bone Marrow Stromal cells(HBMSc)and A172 human glioblastoma cell lines by direct and indirect culture methods to estimate their toxicity for bone and nerve cells,*** Phosphatase(ALP)activity and DAPI/Phalloidin cell staining were also performed to investigate the efficiency of the scaffolds for bone tissue engineering *** results showed that the scaffolds had good biocompatibility with both HBMSC and A172 cells,noticeable improvement on ALP activity,and great apatite formation ability in Simulated Body Fluid(SBF).All the evidence ascertained that willemite scaffolds made by corn stalks could be a useful candidate for bone tissue engineering applications.

关键词： Corn stalk Bio template Bioactive ceramics-Scaffolds Bone tissue engineering

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Construction and Praxis of Six Sigma DMAIC for Bearing Manufacturing Process

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materials Today: Proceedings 2023年 72卷 1426-1433页

作者： Kulkarni, Trishul Toksha, Bhagwan Shirsath, Sagar Pankade, Sandeep Autee, Arun T. Department of Mechanical Engineering Maharashtra Institute of Technology MS Aurangaba 431010 India Maharashtra Institute of Technology Aurangabad 431010 India School of Material Science and Engineering The University of New South Wales Kensington NSW 2052 Australia

The process capability improvement of a bearing manufacturing process using the Six Sigma-DMAIC approach was performed. A progressive method was adopted by the utilization of statistical techniques such as design of experiments for optimizing process capability. We report the draconian improvement in process capability with present approach. This has led to a diminution in high resource spoilage and rework. In the Define-phase, rejection data was used to identify the critical factors responsible for rejection. Process capability indices were used to evaluate the process performance in the Measure-phase. In the Analyze-phase, the vital root causes responsible for low process capability were identified. Using the Taguchi robust design technique, the Improve-phase focuses on optimizing the critical root causes. Analysis of variance was used to examine the results of the experiment. In the control-phase, Cp and Cpk values were improved from 1.170 and 0.976 to 2.780 and 2.230. © 2023

关键词： Six sigma

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