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SSRN 2023年

作者： Li, Tianjiao Zheng, Jiang Gupta, Manoj Xia, Lihong He, Liuyong Liu, Shuaishuai Xia, Dabiao Luo, Jinru Jiang, Bin College of Materials Science and Engineering Chongqing University Chongqing400044 China Department of Mechanical Engineering National University of Singapore Singapore117578 Singapore Shenyang National Laboratory for Materials Science Chongqing University Chongqing400044 China College of Mechanical Engineering Chongqing Technology and Business University Chongqing400067 China The Center of New Energy Materials and Manufacturing Jihua Laboratory Foshan528000 China Suzhou Laboratory Suzhou215004 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing400044 China

Mg-RE (magnesium-rare earth) binary alloys, such as Mg-Y alloys, usually exhibit weakened texture and excellent plasticity compared with traditional RE-free Mg alloys. However, the weakened texture could lead to a significant decrease in the strength of Mg-RE binary alloys. In this work, the weak-textured Mg-3Y (wt. %) extruded sheet displayed good strength-ductility synergy with a 41% increase in the yield strength and a good ductility similar to the initial sheet via simple pre-twinning and annealing treatment (PT). After PT, the average grain size of the sheet decreased from 11.2 μm to 6.0 μm and 34.2% initial soft texture component ( // normal direction (ND)) was transformed into the hard texture component ( // transverse direction (TD)). The effect of pre-twinning on deformation mechanisms was systematically investigated by slip trace analysis and activation stress (τ) analysis. Basal slip was the dominant deformation mechanism during the tension of the as-extruded (AE) specimen while pre-twinning promoted the activation of non-basal slip, especially prismatic slip in the PT specimen. The texture transformation and reduced resolved critical shear stress (CRSS) ratio between basal slip and non-basal slip induced by pre-twinning were primarily responsible for the high activity of non-basal slip. The underlying strengthening mechanism and the reason for good ductility were also rationally discussed. The strengthening effect of single grain refinement was relatively lower in the weak-textured Mg-3Y alloy. Texture hardening could effectively improve the effect of fine-grain strengthening. The excellent deformation compatibility between basal slip of parent grains and prismatic slip of twins as well as relatively higher activity of the second-order pyramidal slip was the origin of the good ductility of the PT specimen. © 2023, The Authors. All rights reserved.

关键词： Binary alloys

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Title: Robust Super-Moiré in Large Angle Single-Twist Bilayers

arXiv

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arXiv 2025年

作者： Li, Yanxing Shi, Chuqiao Zhang, Fan Liu, Xiaohui Xue, Yuan Ha, Viet-Anh Gao, Qiang Dong, Chengye Lin, Yu-Chuan Holtsman, Luke N. Morales-Durán, Nicolas Kim, Hyunsue Jiang, Yi Holbrook, Madisen Hone, James Barmak, Katayun Robinson, Joshua Li, Xiaoqin Giustino, Feliciano Khalaf, Eslam Han, Yimo Shih, Chih-Kang Department of Physics The University of Texas at Austin AustinTX United States Department of Materials Science and NanoEngineering Rice University HoustonTX United States Department of Physics Harvard University CambridgeMA United States Oden Institute for Computational Engineering and Sciences The University of Texas at Austin AustinTX United States Department of Materials Science and Engineering Pennsylvania State University University ParkPA United States Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Applied Physics and Applied Mathematics Columbia University New York CityNY United States Advanced Photon Source Argonne National Laboratory LemontIL United States Department of Mechanical Engineering Columbia University New York CityNY United States

Forming long wavelength moiré superlattices (MSL) at small-angle twist van der Waals (vdW) bilayers has been a key approach to creating moiré flat bands1–8. The small-angle twist, however, leads to strong lattice reconstruction, causing domain walls and moiré disorders, which pose considerable challenges in engineering such platforms6–10. At large twist angles, the rigid lattices render a more robust, but shorter wavelength MSL, making it difficult to engineer flat bands. Here, we depict a novel approach to tailoring robust super-moiré (SM) structures that combines the advantages of both small-twist and large-twist transition metal dichalcogenides (TMDs) bilayers using only a single twist angle near a commensurate angle. Structurally, we unveil the spontaneous formation of a periodic arrangement of three inequivalent commensurate moiré (CM) stacking, where the angle deviation from the commensurate angle can tune the periodicity. Electronically, we reveal a large set of van Hove singularities (VHSs) that indicate strong band hybridization, leading to flat bands near the valence band maximum. Our study paves the way for a new platform of robust SM bilayers with structural rigidity and controllable wavelength, extending the investigation of the interplay among band topology, quantum geometry, and moiré superconductivity to the large twist angle regime. Copyright © 2025, The Authors. All rights reserved.

关键词： Van der Waals forces

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Deformation Behavior of Heterogeneous Lamellar Cu-Fe-P Immiscible Alloys with Enhanced Strength and Ductility Produced by Laser Powder Bed Fusion

SSRN

引用

SSRN 2023年

作者： Wen, Chongyu Qiu, Yatin Zhang, Zhiguo Li, Kunmao Deng, Cheng Hu, Lianxi Chen, Dongchu Lu, Yang Zhou, Shengfeng Institute of Advanced Wear & Corrosion Resistance and Functional Materials Jinan University Guangzhou510632 China Huazhong University of Science and Technology Wuhan430074 China College of Mechatronics Engineering Guangdong Polytechnic Normal University Guangzhou510635 China School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China School of Materials Science and Energy Engineering Foshan University Guangdong Foshan528225 China Department of Mechanical Engineering The University of Hong Kong SAR Pokfulam Hong Kong

Cu-Fe-P immiscible alloys characterized by heterogeneous lamellar structure were manufactured by laser powder bed fusion (LPBF) and the deformation behavior of LPBF-produced immiscible alloys was investigated systematically. When the linear energy density of 133 J/m is adopted during LPBF, the immiscible alloy exhibits the highest compressive strength (~1 GPa) and engineering strain (~27%). The high strength of the LPBF-produced immiscible alloy is attributed to the heterogeneous lamellar structure including the interconnected Fe2P layer and nano-Fe2P particles as "hard" phase dispersed in the Ε-Cu matrix as the "soft" phase. Moreover, the good ductility is attributed to the fine Ε-Cu grains as "soft" phase precipitated within the lamellar Fe2P due to the secondary liquid phase separation (SLPS). This "soft-hard-soft" heterogeneous microstructure can effectively delay crack growth to exhibit excellent mechanical properties in the LPBF-produced immiscible alloys. © 2023, The Authors. All rights reserved.

关键词： Ductility

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Effect of storage conditions on the dietary and pharmaceutical values of ginger oil, and modeling its dielectric properties

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Grasas y Aceites 2024年第4期75卷

作者： Abushal, S.A. Uguru, H. Akpomedaye, O. Kuzmin, A. Sami, R. Helal, M. Alsanei, W.A. Almehmadi, A.M. ALmasoudi, A.G. Program of Food Sciences and Nutrition Turabah University College Taif University Saudi Arabia Department of Agricultural Engineering Delta State University of Science and Technology Ozoro Nigeria Department of Electrical Engineering Delta State University of Science and Technology Ozoro Nigeria Department of Mechanization of Agricultural Products Processing National Research Mordovia State University Saransk Russia Scientific Laboratory of Advanced Composite Materials and Technologies Plekhanov Russian University of Economics Moscow Russia Department of Food Science and Nutrition College of Sciences Taif University Saudi Arabia Department of Mechanical Engineering Faculty of Engineering Taif University Saudi Arabia Department of Food and Nutrition Faculty of Human Sciences and Design King Abdulaziz University Jeddah Saudi Arabia Department of Clinical Nutrition Faculty of Applied Medical Sciences Umm Al-Qura University Makkah Saudi Arabia Program of Food Sciences and Nutrition Biology Department Branch of the College at Turbah Taif University Taif Saudi Arabia

This research was conducted to evaluate the impact of the storage conditions of ginger rhizomes on the nutritional and therapeutic properties of the ginger oil (GO). The physicochemical and phytochemical properties, fatty acid contents and dielectric constant (Ε′) of the GO were analyzed in accordance with standard guidelines. The findings revealed that the storage temperature significantly impacted the quality of GO (p ©2024 CSIC.

关键词： Polyunsaturated fatty acids

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A Functional Human Liver Tissue Model: 3D Bioprinted Co-culture Discoids

arXiv

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arXiv 2024年

作者： Subramaniam, Vignesh Abrahan, Carolina Higgins, Brett Chisolm, Steven J. Sweeney, Baleigh Duraivel, Senthilkumar Balzano-Nogueira, Leandro Palmer, Glyn D. Angelini, Thomas E. Department of Mechanical and Aerospace Engineering Herbert Wertheim College of Engineering University of Florida GainesvilleFL United States Department of Orthopaedic Surgery and Sports Medicine College of Medicine University of Florida GainesvilleFL United States Department of Molecular Medicine Morsani College of Medicine University of South Florida TampaFL33612 United States Department of Materials Science and Engineering Cornell University IthacaNY United States Department of Pathology Immunology Laboratory Medicine Diabetes Institute College of Medicine University of Florida GainesvilleFL United States Department of Materials Science and Engineering Herbert Wertheim College of Engineering University of Florida GainesvilleFL United States J. Crayton Pruitt Family Department of Biomedical Engineering Herbert Wertheim College of Engineering University of Florida GainesvilleFL United States

To reduce costs and delays related to developing new and effective drugs, there is a critical need for improved human liver tissue models. Here we describe an approach for 3D bioprinting functional human liver tissue models, in which we fabricate disc-shaped structures (discoids) 200 µm in thickness and 1-3 mm in diameter, embedded in a highly permeable support medium made from packed microgels. We demonstrate that the method is precise, accurate, and scalable;up to 100 tissues per hour can be manufactured with a variability and error in diameter of about 4%. Histologic and immunohistochemical evaluation of printed discs reveal self-organization, cell cohesion, and key liver marker expression. During the course of 3-4 weeks in culture, the tissues stably synthesize albumin and urea at high levels, outperforming spheroid tissue models. We find the tissues express more than 100 genes associated with molecular absorption, distribution, metabolism, and excretion (ADME) at levels within the range of human liver. The liver tissue models exhibit enzymatic formation of metabolites after exposure to multiple test compounds. Together, these results demonstrate the promise of 3D printed discoids for pharmacological and toxicological applications. © 2024, CC BY.

关键词： Metabolites

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Effects of Incident Angle on Single-Event Leakage Current Degradation in Heavy-Ion Irradiated 1800 v and 4500 v SiC Power MOSFETs

引用

IEEE Transactions on Nuclear science 2025年

作者： Sengupta, A. Martinella, C. Ball, D.R. Niskanen, K. Senarath, A.S. Islam, S. Harris, P.M. Hutson, J.M. Osheroff, J.M. Sternberg, A.L. Kettunen, H. Kosier, S.L. Grossner, U. Javanainen, A. Galloway, K.F. Schrimpf, R.D. Witulski, A.F. Zürich8092 Switzerland Vanderbilt University Interdisciplinary Materials Science Program NashvilleTN37235 United States Lipscomb University Electrical and Computer Engineering Department NashvilleTN37204 United States NASA/GSFC Code 561.4 GreenbeltMD20771 United States Vanderbilt University Electrical Engineering and Computer Science Department B 351825 NashvilleTN37235 United States University of Jyväskylä Department of Physics Jyväskylä40014 Finland

Experimental heavy-ion responses of two variants of SiC power MOSFETs are evaluated. The devices have similar epitaxial thickness but different doping. The higher doping in the epitaxial region results in lower breakdown voltage, and typically leads to a lower threshold drain voltage at which single-event leakage current (SELC) occurs. Furthermore, the heavy-ion-induced SELC degradation in the drain and gate currents of the SiC MOSFETs exhibit a strong dependence on the heavy-ion's angle of incidence. The devices' behavior significantly alters when irradiated with heavy-ions at different incident angles under the same fixed bias and total fluence, as also confirmed by 3-D Technology Computer Aided Design (TCAD) simulations. © 1963-2012 IEEE.

关键词： Power MOSFET

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Microwave torrefaction of empty fruit bunch pellet:Simulation and validation of electric field and temperature distribution

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Journal of Bioresources and Bioproducts 2022年第4期7卷 270-277页

作者： Peter Nai Yuh Yek Sieng Huat Kong Ming Chiat Law Changlei Xia Rock Keey Liew Teck Sung Sie Jun Wei Lim Su Shiung Lam Centre for Research of Innovation and Sustainable Development University of Technology SarawakJalan UniversitySibuSarawak 96000Malaysia School of Foundation Studies University of Technology SarawakJalan UniversitySibuSarawak 96000Malaysia Department of Mechanical Engineering Faculty of Engineering and ScienceCurtin University Malaysia CampusMiriSarawak 98009Malaysia Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China NV WESTERN PLT GeorgetownPenang 10400Malaysia Department of Fundamental and Applied Sciences HICoE-Centre for Biofuel and Biochemical ResearchInstitute of Self-Sustainable BuildingUniversity Technology PETRONASDarul RidzuanSeri IskandarPerak 32610Malaysia Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and Fisheries(AKUATROP)University Malaysia TerengganuKuala NerusTerengganu 21030Malaysia Sustainability Cluster School of EngineeringUniversity of Petroleum&Energy StudiesDehradunUttarakhand 248007India

Microwave simulation is significant in identifying a reactor design allowing the biomass to be heated and processed *** study integrated the radio frequency and transient heat transfer modules to simulate the microwave distribution and investigated the performance of microwave heating in the *** simulation results were compared with the experimental findings us-ing the finite element analysis software of COMSOL MULTIPHYSICS to predict the temperature profile and electric field of microwave in the biomass(empty fruit bunch pellets).The higher temperature distribution was observed at the bottom and centre section of the empty fruit bunch pellet bed in the reactor,showing the uniqueness of microwave *** to the simula-tion results,the temperature profile obtained through the specific cavity geometry and dielectric properties agreed with the experimental temperature *** simulated temperature profile demonstrated a logarithmic increase of 120°C/min at the first 50 s followed by 50°C/min until 350 *** experimental temperature profile showed three different heating rates before reaching 300°C,including 78.3°C/min(50-120°C),30.6°C/min(121-250°C),and 105°C/min(250-300°C).The results of this study might contribute to the improvement of microwave heating in biomass torrefaction.

关键词： Microwave Torrefaction Simulation Energy Temperature

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NN-EUCLID: deep-learning hyperelasticity without stress data

arXiv

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arXiv 2022年

作者： Thakolkaran, Prakash Joshi, Akshay Zheng, Yiwen Flaschel, Moritz De Lorenzis, Laura Kumar, Siddhant Department of Materials Science and Engineering Delft University of Technology Delft2628 CD Netherlands Department of Mechanical and Process Engineering ETH Zürich Zürich8092 Switzerland

We propose a new approach for unsupervised learning of hyperelastic constitutive laws with physics-consistent deep neural networks. In contrast to supervised learning, which assumes the availability of stress-strain pairs, the approach only uses realistically measurable full-field displacement and global reaction force data, thus it lies within the scope of our recent framework for Efficient Unsupervised Constitutive Law Identification and Discovery (EUCLID) and we denote it as NN-EUCLID. The absence of stress labels is compensated for by leveraging a physics-motivated loss function based on the conservation of linear momentum to guide the learning process. The constitutive model is based on input-convex neural networks, which are capable of learning a function that is convex with respect to its inputs. By employing a specially designed neural network architecture, multiple physical and thermodynamic constraints for hyperelastic constitutive laws, such as material frame indifference, material stability, and stress-free reference configuration are automatically satisfied. We demonstrate the ability of the approach to accurately learn several hidden isotropic and anisotropic hyperelastic constitutive laws - including e.g., Mooney-Rivlin, Arruda-Boyce, Ogden, and Holzapfel models - without using stress data. For anisotropic hyperelasticity, the unknown anisotropic fiber directions are automatically discovered jointly with the constitutive model. The neural network-based constitutive models show good generalization capability beyond the strain states observed during training and are readily deployable in a general finite element framework for simulating complex mechanical boundary value problems with good accuracy. Copyright © 2022, The Authors. All rights reserved.

关键词： Constitutive models

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A Fully Additive Fabrication Approach for sub-10-Micrometer Microvia Suitable for 3-D System-in-Package Integration

A Fully Additive Fabrication Approach for sub-10-Micrometer ...

引用

Electronic Components and Technology Conference (ECTC)

作者： Roghayeh Imani Shailesh Chouhan Jussi Putaala Olli Nousiainen Juha Hagberg Sami Myllymäki Sarthak Acharya Heli Jantunen Jerker Delsing Department of Computer Science Electrical & Space Engineering EISLAB Luleå Technical University Luleå Sweden Microelectronics Research Unit University of Oulu Oulu Finland Materials and Mechanical Engineering Research Unit University of Oulu Oulu Finland Department of Information Technology and Electrical Engineering University of Oulu Oulu Finland

The semiconductor industry demands high input/output (I/O) density, requiring sub-l0-micrometer microvia. Here we propose a novel, fully additive, economical approach for creating and copper plating of microvias. The experimental process consisted of three stages. In Stage I, a polyurethane layer was spin-coated onto a FR-4 PCB base, followed by target copper layer deposition using the sequential build-up-covalent bonded metallization (SBU -CBM) method. In Stage II, first another layer of polyurethane was spin-coated on the top of the target copper layer, and then a microvia was created on the polyurethane layer using a picosecond pulsed ultraviolet (UV) laser. Finally, in Stage III, the SBU-CBM method was used to selectively copper plating of the microvia. Optical microscopy and cross-section scanning electron microscopy (SEM) images confirmed the successful formation and copper plating of sub-l0 micrometer microvia.

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Low-carbon advanced nanostructured steels:Microstructure, mechanical properties, and applications

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science China materials 2021年第7期64卷 1580-1597页

作者： Haojie Kong Zengbao Jiao Jian Lu Chain Tsuan Liu Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering&Shenzhen Research Institute The Hong Kong Polytechnic UniversityHong KongChina Department of Materials Science and Engineering City University of Hong KongHong KongChina Center for Advanced Structural Materials Department of Mechanical EngineeringCity University of Hong KongHong KongChina Hong Kong Institute for Advanced Study City University of Hong KongHong KongChina

Low-carbon advanced nanostructured steels have been developed for various structural engineering applications, including bridges, automobiles, and other strength-critical applications such as the reactor pressure vessels in nuclear power stations. The mechanical performances and applications of these steels are strongly dependent on their microstructural features. By controlling the size,number density, distribution, and types of precipitates, it is possible to produce nanostructured steels with a tensile strength reaching as high as 2 GPa while keeping a decent tensile elongation above 10% and a reduction of area as high as 40%. Besides, through a careful control of strength contributions from multiple strengthening mechanisms, the nanostructured steels with superior strengths and low-temperature impact toughness can be obtained by avoiding the temper embrittlement regime. With appropriate Mn additions, these nanostructured steels can achieve a triple enhancement in ductility(total tensile elongation, TE of ~30%) at no expense of strengths(yield strength, YS of ~1100 to 1300 MPa, ultimate tensile strength, UTS of ~1300 to 1400 MPa). More importantly, these steels demonstrate good fabricability and weldability. In this paper, the microstructure-property relationships of these advanced nanostructured steels are comprehensively reviewed. In addition, the current limitations and future development of these nanostructured steels are carefully discussed and outlined.

关键词： heterogeneous nano-precipitates strength-ductility paradox embrittlement dislocation interactions

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