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SSRN 2023年

作者： Su, Shenli Wang, Chunming Mi, Gaoyang Xiong, Lingda Zhang, Wei Wang, Jun School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Mechanical Engineering and Automation Wuhan Textile University Wuhan430200 China

As the most common protective layer in car body protection, the paint layer is an effective barrier against corrosion of the material matrix. The adhesion between the paint layer and the substrate is an important factor to ensure the long-term and effective protection of the paint layer. On the 5083 aluminum alloy substrate, a series of microfabrics with varying depths are produced by laser texturing, with the depth-to-width ratio ranging from 0.12~1.76. The adhesion test of standard GB/T 5210-2006 was used to study the effect of different texturing depths on the adhesion strength of the paint layer. The cross-sectional microstructure and fracture morphology of the paint layer were analyzed and characterized to study the deposition and fracture mechanism of the paint layer. The results show that the presence of laser microfabrics significantly enhances the adhesion of the paint layer, and the influence of microfabrics of different depths and dimensions on the adhesion of the paint layer is different. And found that the optimal depth size affecting the size of adhesion is around 0.67. By analyzing the cross-sectional microstructure and fracture morphology of the paint layer, it is found that the change in paint adhesion is the result of the change of specific surface area, the bonding condition of the paint layer and the substrate surface, and the bubble defect. At the same time, the process of the paint layer flowing on the substrate surface, filling the micro-texture, and forming bubbles was analyzed. © 2023, The Authors. All rights reserved.

关键词： Adhesion

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HiTEC Confernce Keynote Novel materials and Structures for Wide and Ultra-Wide Bandgap Semiconductor Switches

HiTEC Confernce Keynote Novel Materials and Structures for W...

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作者： Christou, A. Materials Science and Engineering Department Mechanical Engineering Department CALCE Research Center College ParkMD United States

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3D Printing of Carbonaceous Hydrogel Electrodes for Energy Applications

3D Printing of Carbonaceous Hydrogel Electrodes for Energy A...

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International Joint Conference on Mechanics, Design engineering and Advanced Manufacturing, JCM 2024

作者： Rego, Jesús M. Rodriguez Romero, Alfonso Carlos Marcos Cerezo, Laura Mendoza García, Antonio Macías de Asís Iñesta Vaquera, Francisco Amador, Juan P. Carrasco Department of Graphic Expression School of Industrial Engineering University of Extremadura Avenida de El-Vas s/n Badajoz06006 Spain Department of Mechanical Energy and Materials Engineering School of Industrial Engineering University of Extremadura Avenida de Elvas s/n Badajoz06006 Spain Department of Biochemistry and Molecular Biology and Genetics Faculty of Science University of Extremadura. Avenida de Elvas Avenida de Elvas s/n Badajoz06006 Spain

ISBN: (纸本)9783031728280

Hydrogels are three-dimensional networks of polymers with high water absorption capacity. They are formed by physical, ionic or chemical cross-linking of polymer chains. These materials are widely used as bioinks in bioprinting, due to their structural similarity to the native extracellular matrix. They also have applications in the food and cosmetics industry. In this work, the 3D printing of carbonaceous hydrogel electrodes for energy applications is proposed. The aim is to fabricate electrodes with the desired geometry, characterise their properties and evaluate their performance in the fabrication of supercapacitors. The hydrogel and carbon materials will be selected, the electrodes will be designed for 3D printing, the printing parameters will be optimised and the electrodes will be characterised (morphology, mechanical properties, electrical conductivity). Finally, the performance of the electrodes will be evaluated by forming a supercapacitor from a Swagelok cell. 3D printing of carbonaceous hydrogel electrodes opens up new possibilities for the development of more efficient and sustainable energy devices. The main advantages are: ∙ Hydrogels can be functionalised with different chemical groups to improve their conductivity, catalytic activity or energy storage capacity. ∙ Hydrogels can be made from biodegradable and biocompatible materials, making them a sustainable alternative to traditional electrodes. This study has the potential to revolutionise the field of energy technologies by offering a new generation of more efficient, sustainable and versatile electrodes. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Crosslinking

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Breaking Barriers and Building Confidence: Unleashing the Power of Digital Tools and Gender-Balanced Teams in engineering Education 54

Breaking Barriers and Building Confidence: Unleashing the Po...

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54th IEEE Frontiers in Education Conference, FIE 2024

作者： Barry, Matthew M. Deangelo, Linda Rossetti, Cara R. Wielgosz, Sarah E. Pabst, David M. Mezini, Lorena Dosse, Lee A. University of Pittsburgh Dept. of Mechanical Engineering and Materials Science PittsburghPA United States University of Pittsburgh Dept. of Educational Foundations Organizations and Policy PittsburghPA United States University of Maryland Dept. of Aerospace Engineering College ParkMD United States University of Pittsburgh Dept. of Physics and Astronomy PittsburghPA United States

ISBN: (纸本)9798350351507

This research-based full paper focuses on building confidence and inclusion for women engineering students by implementing various modes of learning (e.g., an interactive online textbook, Pre-recorded Lecture Videos (PLVs), and equally gendered-ratio teams for in-class team worksheets and course project) into a sophomore-level engineering course. It has been recognized that lack of inclusion has been linked to negative outcomes in student performance, specifically for women. As men dominate most engineering majors, it has been seen that women students find it hard to participate in group work settings. When working in groups, women students have experienced gender biases that were demeaning and often have their ideas or designs second-guessed. These feelings of self-doubt and lack of involvement, repeated over time, led many women students to leave engineering. It is hypothesized that by providing many learning opportunities outside the classroom that positively reinforce their knowledge and understanding and by balancing the gender ratio of teams, women will be more confident in their abilities and feel more included, respectively. Confidence plays a deciding factor in the retention rates of women within science, technology, engineering, and mathematics (STEM) fields of study. Anecdotally, it was discovered that during the development and implementation of an interactive online textbook and using PLVs, many women within the introductory Statics and Mechanics of materials 1 course felt something unfamiliar compared to other STEM courses: confidence. Confidence is a prime indicator of successful completion of a program. To further explore this finding, a study involving focus groups was conducted with three assemblages of women within the course. Two focus groups discussed using the interactive online textbook (n=8 and n = 9), while one discussed using PLVs (n=8). These focus groups were moderated by two women, a Ph.D. student in Physics and a current mechanical Engi

关键词： Students

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3D Printing of Gradient-Doped Yb:YAG Laser Ceramics by Leveraging Active Mixing

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Additive Manufacturing Frontiers 2024年第1期3卷 96-102页

作者： Mengmeng Xie Haohao Ji Dewen Wang Junping Wang Jian Zhang Yu Liu Dianzi Liu Shiwei Wang Nianjiang Chen Lei Wang Yuan Gao School of Mechanical Engineering Jiangnan UniversityWuxi214122China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China School of Engineering University of East AngliaNorwichNR47TJUK Science and Technology on Solid-State Laser Laboratory Beijing100015China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing100081China

Gradient-doped laser ceramics fabricated via 3D printing have great potential for high-power laser ***,it is challenging to produce such types of gain media because it is inconvenient to fabricate different component slurries prepared offline using traditional methods *** address these issues,a facile approach for the additive manufacturing of high-power laser ceramics is proposed for gradient structure ***,a material-extrusion-based 3D printing device with a homemade active mixing module is developed to fabricate gradient-doped Yb:YAG(Y3 Al5 O12)laser ceramics using two slurries with different doping ***-sequently,the active mixing module is systematically investigated to obtain different Yb-doped concentrations of printing slurries with a uniform element *** measuring the switching delay volume between dif-ferent components,a proper volume adjustment enables the Yb concentration distribution of the green bodies to be consistent with the designed profile in the 3D ***,multi-component(0-5-10-5-0 at%Yb:YAG)green bodies are printed,and experimental tests are conducted to evaluate the performance of these gradient-doped laser *** results show that the gradient-doped ceramic obtained 82.1%in-line transmittance at 1100 nm(4.6 mm thickness,along with the doping concentration gradient)and the average Yb ions diffusion distance across the interface fitted in the 20-30𝜇m ***,a 1030 nm laser output with an output power of 4.5 W with a slope efficiency of 41.3%is achieved when pumped with a 940 nm laser *** study provides useful insights for developing various gradient rare-earth-doped laser ceramics for high-power laser applications.

关键词： Yb:YAG Laser ceramics 3D printing Gradient-doped Active mixing

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Illumination interface stability of aging-diffusion-modulated high performance InZnO/DyO_(x) transistors and exploration in digital circuits

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Journal of materials science & Technology 2021年第28期87卷 143-154页

作者： Bing Yang Gang He Qian Gao Wenhao Wang Yongchun Zhang Yufeng Xia Xiaofen Xu Leini Wang Miao Zhang School of Physics and Materials Science Radiation Detection Materials&Devices LabAnhui UniversityHefei230601China Institute of Physical Science and Information Technology Anhui UniversityHefei230601China School of Mechanical Engineering Anhui Vocational and Technical CollegeHefei230011China

In current study,the rare-reported solution-driven DyO_(x)films have been prepared to act as the dielectric layer of high performance InZnO/DyO_(x)thin film transistors(TFTs).Annealing temperature dependent thermal decomposition,morphology,crystallization behavior,and chemical compositions of DyO_(x) and InZnO films have been investigated *** have demonstrated that air-annealed InZnO/DyO_(x)TFTs possess the improved electrical performance,including ultrahigh on/off current ratio of 1×10^(9),larger saturation mobility of 12.6 cm^(2) V-1 s^(-1) and negligible hysteresis after 10 d aging diffusion in the relative humidity(RH)of 40%air ambient,which has been explored by the variable range-hopping(VRH)percolation model and energy band *** distinct illumination bias stability can be attributed to the generated various interface defects and concluded that the white light illuminated TFT behaves the higher stability with the smaller threshold voltage shift of 0.25 *** confirm its feasible application in digital circuit,a resistor-loaded inverter based on InZnO/DyO_(x)TFTs has been constructed.A high gain of 10.1 and good dynamic response behavior have been detected at a low operating voltage of 2 *** a result,it can be inferred that diffusion-induced enhanced carrier transporting mechanism is an economical and effective method to optimize the electrical performance of solution-derived InZnO/DyO_(x)TFTs,indicating its potential application prospects in flexible transparent electronics with low power consumption.

关键词： Dysprosium oxide(DyO_(x)) Thin film transistors(TFTs) Aging-diffusion Inverter Illumination bias stability

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Effect of laser power on microstructure and properties of high-speed laser cladding of S890 steel

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Welding in the World 2025年 1-14页

作者： Wang, Kanglong Chang, Yunfeng Guo, Xiaoqin Wei, Tongda Fu, Yishuai Zhang, Shannan Wang, Dongliang State Key Laboratory of High Performance and Advanced Welding Materials China Academy of Machinery Zhengzhou Research Institute of Mechanical Engineering Co. Ltd Zhengzhou China School of Materials Science and Engineering Zhengzhou University of Aeronautics Zhengzhou China Henan Key Laboratory of Aeronautical Materials and Application Technology Zhengzhou University of Aeronautics Zhengzhou China

High-speed laser cladding was utilized to deposit a stainless steel coating on an S890 high-strength steel shaft and a laser power range of 2400 to 4200 W. The microstructure, mechanical properties, and grain growth behavior of the coating were systematically investigated. As the laser power increases, coating thickness, the width of the heat-affected zone, and the dilution rate exhibit a gradual upward trend, whereas the surface roughness initially decreases and subsequently increases, the grain size initially decreases and subsequently increases, and the element distribution becomes progressively more non-uniform. The microstructure of the coating predominantly consists of fine equiaxed grains and columnar grains, with the major phase being α-Fe. Compared to the substrate, the coating demonstrates enhanced hardness and corrosion resistance, the maximum hardness of the coating increases by 131.3%, and the corrosion tendency of the optimal coating decreased by 81.8%. Crystal grain refinement, homogeneous distribution of elements, and a high content of high-angle grain boundaries contribute to impeding dislocation movement, thereby prominently enhancing the mechanical properties of the coating. The high-speed laser cladding technology not only facilitates the improvement of the coating’s forming quality but also reinforces its surface strength and comprehensive performance.

关键词： High-speed laser cladding Laser power Microstructure mechanical properties

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External voltage driven linear burning rates for improving propulsion efficiency and control in space applications

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Aerospace science and Technology 2025年 164卷

作者： Rajak, Rajendra Lim, Daehong Oh, Juyoung Gnanaprakash, Kanagaraj Yoh, Jack J. Aerospace Engineering Seoul National University Seoul 08826 Korea Republic of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Mechanical and Aerospace Engineering Indian Institute of Technology Hyderabad 502284 India

This study explores the use of titanium (Ti) as a metal additive in electrically controlled solid propellants (ECSPs), aiming to address the siphoning effect caused by high-electrical-conductivity metals like aluminum (Al). Ti, with its unique combination of thermal and electrical properties, enhances ECSP performance by offering a higher burning rate at lower voltages and a linear burning rate trend, unlike the exponential trend seen with Al and tungsten (W). Performance metrics such as specific impulse (Isp) and adiabatic flame temperature are comparable between Ti and Al formulations. Ti's micro-explosion phenomena further improve heat transfer to the propellant surface, reducing ignition delay, minimizing agglomeration, and accelerating fuel decomposition. Ti-ECSP also produces finer combustion residues (3–6 μm) compared to Al-ECSP and W-ECSP (10–20 μm), reducing two-phase flow losses. These findings suggest that Ti-ECSP is promising for precise thrust control in space applications, such as satellite maneuvering and station-keeping, while Al-ECSP and W-ECSP remain competitive for missions requiring rapid, sustained thrust. © 2025 Elsevier Masson SAS

关键词： HMX

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Formulation of forsterite bioceramic ink for extrusion based 3D printing: Rheology, printability and mechanical properties

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Ceramics International 2025年

作者： Wong, Zong Qi Yeo, Wei Hong Tey, Jing Yuen Ting, Chen Hunt Teoh, Hoon Koon Ng, Chui Kim Yew, Ming Chian Ramesh, S. Department of Mechanical and Materials Engineering Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman Selangor Kajang43000 Malaysia Department of Preclinical Sciences M. Kandiah Faculty of Medicine and Health Sciences Universiti Tunku Abdul Rahman Selangor Malaysia Centre for Advanced Materials Department of Manufacturing Technology Faculty of Engineering & Technology Tunku Abdul Rahman University of Management and Technology Kuala Lumpur53300 Malaysia Department of Mechanical Engineering Faculty of Engineering Universiti Teknologi Petronas Perak Seri Iskandar32610 Malaysia Department of Mechanical Engineering Faculty of Engineering Universiti Malaya Kuala Lumpur50603 Malaysia

materials extrusion-based 3D printing offers the advantage of rapidly fabricating complex structures at a relatively low cost, making it highly suitable for bioprinting applications. Forsterite (Mg2SiO4) ceramic has garnered significant research interest due to its silicon and magnesium content, which confer excellent biocompatibility for developing bone implant materials. However, despite its potential in bone implant applications, the development of printable ink formulations for the 3D printing of forsterite structures remains largely unexplored. This study aimed to develop a printable ink formulation for forsterite ceramics and to investigate the mechanical properties of the resulting structures after sintering. A printable ink containing MgO-SiO2 as the filler was developed with a mixture of sodium hexametaphosphate (SHMP) as dispersion, carboxymethyl cellulose (CMC) as binder, along with ammonium polyacrylate (BYK154) and fumed silica as viscosity and thixotropy modifiers. The scaffold structures were printed and subsequently sintered at temperatures ranging from 1350oC to 1500oC to form the forsterite ceramic structures. The resulting total porosity decreased from 65.92 % to 40.93 % as the sintering temperature increased. In parallel with the reduction in porosity, the compressive strength of the sintered scaffold increased from 16.55 MPa to 132.25 MPa, while the Young's modulus improved from 0.45 GPa to 1.81 GPa. Additionally, the yield strain and specific energy absorption (SEA) of the sintered scaffold reached up to 9.42 % and 3.55 kJ/kg, respectively, demonstrating enhanced structural integrity and energy absorption capabilities. These findings highlight the potential of forsterite ceramics for future applications, such as bone tissue engineering (BTE), which demand geometrically complex and customizable scaffolding structures. © 2025

关键词： Compressive strength

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Preliminary Investigation of Spring-Based Gravity Compensation for an Upper Limb Assistive Robot

Preliminary Investigation of Spring-Based Gravity Compensati...

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International Conference on Mechatronics (ICM)

作者： Ming Jiang Yang Wang Qizhi Meng Chin-Hsing Kuo Marco Ceccarelli Yusuke Sugahara Yukio Takeda Department of Mechanical Engineering Institute of Science Tokyo Tokyo Japan School of Mechanical Materials Mechatronic and Biomedical Eng. University of Wollongong Wollongong Australia Department of Industrial Engineering University of Rome Tor Vergata Rome Italy

ISBN: (数字)9798331533892

ISBN: (纸本)9798331533908

Upper limb assistive robots have been widely developed due to their ability to aid user movement and reduce caregiver workload. In our previous work, we introduced a wearable end-effector-type upper limb assistive robot, WELiBot. To enhance the robot's portability and reduce the required actuation torque, this work investigates gravity compensation for WELiBot's mechanism using springs. Following the 1-DOF gravity compensation principle, springs were designed for lifting and reaching movement respectively. The effectiveness of this compensation effect was then evaluated by comparing the necessary torque at the actuating joints with and without springs. This work offers insight into gravity compensation for parallel mechanisms and contributes to the future development of WELiBot.

关键词： Limbs Torque Mechatronics Wearable robots Assistive robots Springs Gravity

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