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Microstructure of 2D/2D Nanosheets Interface for Improved ORR Electrochemical Kinetics

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1352-1353页

作者： Iqbal, Anum Hamdan, Nasser M. Material Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Physics Department American University of Sharjah Sharjah United Arab Emirates

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Cutting Experiment of Fraxinus mandshurica UsingWaterjet-Assisted CO_(2)Laser

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Journal of Renewable materials 2023年第9期11卷 3583-3593页

作者： Yueqiang Yu Minzheng Jiang Sheng Gao Ting Jiang Bakary S.Doumbia Bo Yan Tingang Ma Kexin Ren Yinsong Liu College of Mechanical Science and Engineering Northeast Petroleum UniversityDaqing163318China Forestry and Woodworking Machinery Engineering Technology Center Northeast Forestry UniversityHarbin150040China Research and Development Center of 3D Printing Material and Technology Northeast Forestry UniversityHarbin150040China

High-quality wood products and valuable wood crafts receive everyone’s favor with the rapid development of the *** order to improve the cutting surface quality of wood forming parts,the cutting experiment of renewable Fraxinus mandshurica was conducted by waterjet-assisted CO_(2)laser(WACL)technology.A quadratic mathematical model for describing the relationship between surface roughness changes and cutting parameters was *** effects of cutting speed,flow pressure and laser power on the kerf surface roughness of Fraxinus mandshurica when cutting transversally were discussed by response surface *** experimental results showed that kerf surface roughness decreased under a lower laser power,higher cutting speed and higher flow *** the cutting speed was 30 mm/s,flow pressure was 1.58 MPa and laser power was 45 W,the actual surface roughness of the optimized Fraxinus mandshurica was 2.41μm,and it was in accord with the theoretically predicted surface roughness value of 2.54μm,so the model fitted the actual situation *** the analysis of 3D profile morphology and micromorphology,it was concluded that the optimized kerf surface of Fraxinus mandshurica was smoother,the cell wall was not destroyed and the tracheid was *** provides the theoretical basis for wood micromachining.

关键词： Green processing waterjet-assisted CO_(2)laser machining transverse cutting response surface method surface roughness

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Short Wave Infrared Upconversion Imager with Electron Blocking Layer to Screen Electron Injection into Photosensitive Layer 5

Short Wave Infrared Upconversion Imager with Electron Blocki...

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5th IEEE International Conference on Flexible and Printable Sensors and Systems, FLEPS 2023

作者： Shin, Chanho Li, Ning Ng, Tse Nga University of California San Diego Material Science and Engineering Program La Jolla United States University of California San Diego Department of Electrical and Computer Engineering La Jolla United States

ISBN: (纸本)9781665457330

In this work, we demonstrated upconversion imagers integrated with shortwave infrared photodetectors paired with an electron blocking layer. The use of electron blocking layer screened charge injection to prevent recombination in photosensitive layer. The characteristics of each electron blocking layer were analyzed in aspects of noise and detectivity. For the optimized device, the parasitic luminance in the dark was efficiently suppressed, and the photon-to-photon efficiency was increased. The electron blocking layer used in this work is generally applicable for upconversion imagers using different absorption and emitting materials. © 2023 IEEE.

关键词： Photodetectors

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Gaussian Process-based Active Learning for Efficient Cardiovascular Disease Inference

Gaussian Process-based Active Learning for Efficient Cardiov...

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2023 IEEE International Conference on Bioinformatics and Biomedicine, BIBM 2023

作者： Tassi, Stavroula C. Polyzos, Konstantinos D. Fotiadis, Dimitrios I. Sakellarios, Antonis I. Department of Material Science and Engineering Ioannina Greece University of Patras Department of Mechanical and Aeronautics Engineering Patras Greece University of Minnesota Department of Electrical and Computer Engineering MN United States Biomedical Reasearch Institute Ioannina Greece University of Patras Laboratory of Biomechanics and Biomedical Engineering Department of Mechanical and Aeronautics Engineering Patras Greece Ioannina Greece

ISBN: (纸本)9798350337488

Cardiovascular disease (CVD) poses a significant global health challenge, and accurate inference methods are vital for early detection and intervention. However, the quality of prediction relies heavily on the availability of labeled data, which are often limited in medical applications. To cope with the challenge of limited labeled data, we are the first to propose an active learning (AL) approach that leverages a weighted ensemble of Gaussian processes to effectively infer CVD by strategically selecting the few most informative data points to label. Through experiments conducted on the SMARTool dataset, we demonstrate the effectiveness of the advocated approach, achieving superior performance in CVD inference compared to baseline methods. Our findings highlight the potential impact of the proposed AL framework in CVD diagnosis and treatment clinical cases, particularly in scenarios where labeled data are scarce, due to data confidentiality concerns or high sampling costs. © 2023 IEEE.

关键词： CVD inference Ensemble of Gaussian Processes (EGPs) FFR index Gaussian Processes (GPs)

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Microstructure and yield phenomenon of an extruded Mg-Y-Cu alloy with LPSO phase

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Journal of Rare Earths 2023年第3期41卷 454-461,I0005页

作者： Guangli Bi Niuming Zhang Jing Jiang Yuandong Li Tijun Chen Wei Fu Xiaoru Zhang Daqing Fang Xiangdong Ding State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Material Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China

A yield phenomenon was firstly reported in an extruded Mg-6.8Y-2.5Cu alloy and the corresponding microstructure was also investigated in this work,The cast alloy is mainly composed ofα-Mg,18R long period stacking order(LPSO)phase,eutectic phase(Mg_(20)Cu_(4)Y_(1)),and Mg_(2)Cu *** 18R LPSO phase at the dendritic grain boundary transforms into the 14H LPSO phase in the grain interior during *** extrusion,the grain size of the homogenized alloy is remarkably refined to-3.69μm and the second phase is significantly broken and distributed in the extrusion *** testing curves of the extrude alloy at room temperature indicate that the yield strength and ultimate tensile strength increase while the elongation of the alloy decreases with increasing strain ***,a yield plateau fo rms and gradually decreases with increasing strain *** yield phenomenon is related to the dislocation multiplication and the interaction between the movable dislocations and solute atoms.

关键词： Extruded Mg-6.8Y-2.5Cu alloy Long period stacking order phase Microstructure Yield phenomenon Rare earths

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Covalent organic frameworks:Design and applications in electrochemical energy storage devices

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InfoMat 2022年第6期4卷 1-35页

作者： Shikai Jin Omar Allam Seung Soon Jang Seung Woo Lee George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGeorgiaUSA Computational NanoBio Technology Laboratory School of Material Science and EngineeringGeorgia Institute of TechnologyAtlantaGeorgiaUSA

As an emerging class of crystalline organic material,covalent organic frameworks(COFs)possess uniform porosity,versatile functionality,and precise control over designated *** from the favorable charge and mass transport pathways offered by the porous framework,COFs can also exhibit designed reversible redox *** the past few years,their potential has attracted a great deal of attention for charge storage and transport applications in various electrochemical energy storage devices,and numerous design strategies have been proposed to enhance the corresponding electrochemical *** review summarizes the working principle and synthesis methods of COFs and discusses significant findings for supercapacitors and various rechargeable battery systems,emphasizing the representative design strategies and their underlying relationship with electrochemical *** addition,key advances achieved by computations are highlighted along with the challenges and prospects in this field.

关键词： covalent organic frameworks rechargeable batteries redox-active electrodes solid electrolyte supercapacitors

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mechanical and Rheological Properties of Bamboo Pulp Fiber Reinforced High Density Polyethylene Composites:Influence of Nano CaCO_(3)Treatment and Manufacturing Process with Different Pressure Ratings

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Journal of Renewable materials 2022年第7期10卷 1829-1844页

作者： Cuicui Wang Xin Wei Lee MSmith Ge Wang Shuangbao Zhang Haitao Cheng International Centre for Bamboo and Rattan Beijing100102China Department of Mechanical and Energy Engineering University of North TexasDenton76203USA Beijing Key Laboratory of Wood Science&Engineering College of Material Science&TechnologyBeijing Forestry UniversityBeijing100083China

In order to investigate the effect of the relative motion of nano CaCO_(3)reinforced bamboo pulp fiber(BPF)/HDPE composite components on the mechanical performance,a comparative study was *** was treated by nano CaCO_(3)blending(BM)and impregnation modification(IM)*** composites were produced using hot press(HPMP),extrusion(EMP)and injection molding process(IMP).The physical morphology of BPF was similar at different manufacturing *** to the samples manufactured by HPMP,a decrease in the(specific)flexural strength of BPF/HDPE composites and an increase in those of composites treated by nano CaCO_(3)manufactured by EMP and IMP were *** injection molded composites exhibited the best values in the(specific)impact strength,(specific)tensile *** had a greater effect on the rheological behavior of the composites than BM,and nano CaCO_(3)treatment most effectively affected the performance of the extrusion molded composites.

关键词： Nano CaCO_(3) bamboo pulp fiber composites manufacturing process mechanical properties rheological properties

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Influence of Process Parameters on SOEC Performance

Influence of Process Parameters on SOEC Performance

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243rd ECS Meeting

作者： Lee, J.-I. Ghosh, E. Mulligan, J.R. Akter, A. Pal, U. Basu, S. Gopalan, S. Division of Material Science and Engineering Boston University BrooklineMA02446 United States Department of Mechanical Engineering Boston University BostonMA02215 United States

ISBN: (纸本)9781607685395

Solid oxide electrolysis cells (SOECs) are highlighted as promising power-to-gas (P2G) devices that can provide a reliable supply of hydrogen gas to store renewable energy. Despite the potential of SOECs, there are many challenges facing their commercialization. In this work, the influence of process parameters and fuel electrode optimization on initial SOEC performance (500 hours) is investigated. Electrolysis experiments were performed with both GDC (gadolinia doped ceria)-infiltrated and uninfiltrated Ni-YSZ (yttria stabilized zirconia) fuel electrodes under various hydrogen flow rates with different ratios of H2-H2O and current densities. All cells marginally improve in performance initially, then undergo a brief period of rapid performance degradation followed by stabilization. The observed three stages of cell performance, in terms of length of time and rate of change, are found to be dependent on the type of fuel electrode and experimental process parameters used. © The Electrochemical Society.

关键词： Regenerative fuel cells

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A novel D0_(22)-strengthened medium entropy alloy with outstanding strength-ductility synergies over ambient and intermediate temperatures

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Journal of materials science & Technology 2024年第35期202卷 152-164页

作者： Jie Gan Jinxiong Hou Tzuhsiu Chou Xier Luo Jiang Ju Junhua Luan Guoqiang Huang Bo Xiao Jixun Zhang Jianyang Zhang Yakun Tao Junheng Gao Tao Yang Department of Materials Science and Engineering City University of Hong KongHong KongChina Hong Kong Branch of National Precious Metals Material Engineering Research Centre(NPMM) City University of Hong KongHong KongChina Department of Mechanical Engineering City University of Hong KongHong KongChina National Center for International Research on Deep Earth Drilling and Resource Development Faculty of EngineeringChina University of Geosciences(Wuhan)Wuhan 430074China Research Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Liaoning Academy of Materials Shenyang 110000China City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China

Precipitation-strengthened medium/high-entropy alloys(MEAs/HEAs)have great potential for high-temperature *** this study,we designed a novel Ni_(45.9)Fe_(23)Cr_(23)V_(4)Nb_(3)Mo_(1)B_(0.1)(at.%)MEA alloy,hardened by the D0_(22)(Ni,Fe,Cr)_(3)(Nb,V)-type nanoprecipitates,with an excellent strength-ductility com-bination from room to elevated ***,the tensile strengths,at 700 and 800℃,could be maintained as high as 845 and 589 MPa,respectively;meanwhile,elongations at all testing temper-atures exceeded 25%without any intermediate-temperature *** temperature-dependent deformation mechanisms were unraveled using multi-scale characterizations,which involved profound slip planarities,such as stacking fault(SF)networks and deformation twins(DTs).Furthermore,the crit-ical resolved shear stress(CRSS)to initiate SFs in both face-centered cubic(FCC)and D0_(22)phases was evaluated,and the possible reasons for the origin of anomalous DTs at 800℃were discussed in *** main findings demonstrate that the shearable D0_(22)nanoparticles can provide the FCC matrix with considerable dislocation storage capacity,reinforcing strain hardening at ambient and intermedi-ate *** work provides fundamental insights into the controllable design and deformation mechanisms of high-performance D0_(22)-strengthened MEAs/HEAs.

关键词： Precipitation strengthening Medium-entropy alloys D0_(22)phase Intermediate-temperature embrittlement High-temperature deformation

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Application of material constitutive and friction models parameters identified with AI and ALE to a CEL orthogonal cutting model 19

Application of material constitutive and friction models par...

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19th CIRP Conference on Modeling of Machining Operations, CMMO 2023

作者： Ducobu, François Palanisamy, Nithyaraaj Kugalur Arrazola, Pedro-José Rivière-Lorphèvre, Edouard Machine Design and Production Engineering Lab Research Institute for Science and Material Engineering University of Mons Mons7000 Belgium Mechanical and Manufacturing Department Faculty of Engineering Mondragon Unibertsitatea Loramendi 4 Arrasate-Mondragón20500 Spain

The identification of input parameters for funite element modelling of the cutting process is still a complex task as the experimental testing equipment cannot reach its combined levels of strains, strain rates and temperatures. Inverse identification using Artificial Intelligence method provides a relevant alternative. In this paper, material constitutive and friction models parameters identified with an Efficient Global Optimization algorithm and an ALE orthogonal cutting model are introduced in a CEL model. Assessment of the differences in the results due to the formulation and dependence of parameters identification to the finite element model are then performed. © 2023 Elsevier B.V.. All rights reserved.

关键词： Finite element method

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