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Hierarchically porous 3D Y-branched carbon tube grids for high-performance filter capacitors

science China(Technological sciences) 2025年第4期68卷 49-58页

作者： Gan CHEN Fangming HAN Guowen MENG Bingqing WEI Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Department of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Department of Mechanical Engineering University of DelawareNewark DE 19716USA

The rapid development of sustainable green energy,which often generates fluctuating electrical signals,has driven the demand for high-performance filter capacitors in alternating/direct current *** bulky aluminum electrolytic capacitors with electric double-layer capacitors(EDLCs)holds promise for electronics ***,EDLCs face a trade-off between charge storage ability and ion/electron transport ***,we demonstrate three-dimensional Y-branched carbon tube(3D-YCT)grids with a hierarchically porous structure as electrodes for line-filtering *** branching patterns and positions within the 3D-YCT are precisely tailored through the nanochannels inside anodic aluminum oxide *** integrated 3D Y-branched CT arrays provide unobstructed pathways for fast frequency response and extensive surfaces for high *** resulting 3D-YCT-based EDLC achieves a desirable specific areal capacitance(C_(A))of 3.6 mF cm^(-2)with a phase angle of-80°at 120 Hz,outperforming most reported line-filtering EDLCs and demonstrating excellent line-filtering *** findings offer valuable insights for constructing miniaturized filter capacitors.

关键词： hierarchically porous structures three-dimensional Y-branched carbon tube grids fast frequency response electric double-layer capacitors AC line-filtering

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Microfluidic QCM enables ultrahigh Q-factor:a new paradigm for in-liquid gravimetric sensing

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Microsystems & Nanoengineering 2024年第4期10卷 377-389页

作者： Yicheng Zhao Zehra Parlak Wenjun Yu Daniel French Wilkins Aquino Stefan Zauscher Thomas Lord Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNCUSA Qatch Technologies LLC.DurhamNCUSA Department of Civil and Environmental Engineering Duke UniversityDurhamNCUSA

Acoustic gravimetric biosensors attract attention due to their simplicity,robustness,and low ***,a prevailing challenge in these sensors is dissipation which manifests in a low quality factor(Q-factor),which limits their sensitivity and *** mitigate dissipation of acoustic sensors in liquid environments we introduce an innovative approach in which we combine microfluidic channels with gravimetric *** implement this novel paradigm we chose the quartz crystal microbalance(QCM)as our model system,owing to its wide applicability in biosensing and the relevance of its operating principles to other types of acoustic *** postulate that the crucial determinant for enhancing performance lies in the ratio between the width of the microfluidic channels and the wavelength of the pressure wave generated by the oscillating channel side walls driven by the *** hypothesis is supported by finite element analysis(FEA)and dimensional studies,which revealed two key factors that affect device performance:(1)the ratio of the channel width to the pressure wavelength(W=λp)and(2)the ratio of the channel height to the shear evanescent wavelength(H=λs).To validate our hypothesis,we fabricated a microfluidic QCM(μ-QCM)and demonstrated a remarkable 10-fold improvement in its dissipation when compared to conventional *** novel microfluidic approach offers several additional advantages,such as direct data interpretation,reduced volume requirement for sample liquids,and simplified temperature control,augmenting the sensor’s overall *** fostering increased sensitivity,accuracy,and ease of operation,our novel paradigm unlocks new possibilities for advancing gravimetric technologies,potentially for biosensing applications.

关键词： QCM enable hypothesis

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Additive manufacturing of Cu-AI-Mn shape memory alloy with enhanced superelasticity

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Rare Metals 2023年第12期42卷 4234-4245页

作者： Meng-Wei Wu Zhuo-Fan Hu Bing-Bing Yang Ying Tao Rui-Ping Liu Chun-Mei Ma Lei Zhang Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering University of Alaska FairbanksFairbanks 99775-5905USA

The Cu-based shape memory alloy(SMA)with highly oriented columnar crystals is an ideal candidate for the commercial application,especially the ones obtained through rapid cooling via additive manufacturing *** this work,Cu_(71)Al_(18)Mn_(11)(at%)shape memory alloy with strong<001>texture columnar grains was successfully prepared by selective laser melting(SLM).An L27(313)orthogonal array was designed to systematically investigate the effects of laser power,scanning speed,scanning spacing,layer thickness and their interactions on the forming quality of Cu_(71)Al_(18)Mn_(11)***_(71)Al_(18)Mn_(11)alloys with density of 7.3204 g·cm^(-3)and relative density of 99.18%were successfully prepared when the laser power,scanning speed,scanning distance and layer thickness were 240 W,1000 mm·s^(-1),0.11 mm and 25μm,the transformation onset temperature(Ms),martensite phase transformation termination temperature(Mf),austenite phase transformation onset temperature(AS)and austenite phase transformation termination temperature(Af)are-21.84,-26.04,-15.75 and-12.36℃,*** compression strength and fracture strain along the building direction(BD)were significantly superior to the scanning direction(SD),while the superelasticity of compression along the SD reached 2.50%,which was better than that of2.32%along *** mechanical property and superelasticity anisotropy due to the formation of columnar grains and texture were *** study shows that SLM is a proposed method for the preparation of Cu-Al-Mn SMAs with high superelasticity,which provides a new strategy for enhancing the shape memory alloy superelasticity.

关键词： Shape memory alloy(SMA) Selective laser melting(SLM) Columnar grains Superelasticity properties

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Ultrasound-Enabled Adaptive Protocol for Fast Charging of Lithium-Ion Batteries

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Journal of Electrochemical Energy Conversion and Storage 2025年第3期22卷 031012页

作者： Im, Ganghyeok Lu, Wei Popa, Bogdan Ioan Epureanu, Bogdan I. Department of Mechanical Engineering University of Michigan Ann ArborMI48109 United States Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States

This paper introduces an ultrasound-assisted multistage constant current (UA-MSCC) charging protocol to enhance the charging performance of lithium-ion batteries. In this approach, ultrasound is applied during the final portion of each MSCC charging phase. Experimental results demonstrate that ultrasound decreases the internal resistance of pouch cells by up to 7%, leading to significant increase in charging capacity during each MSCC stage. The overall charging time is reduced by 26% compared to the conventional constant current-constant voltage (CCCV) protocol. The performance improvement delivered by this ultrasound-assisted charging approach is especially large when the battery is charged at low temperatures and to a partial capacity. Notably, the application of ultrasound improves the coulombic efficiency to levels comparable to that at the room temperature when charging in cold environments (0 °C). This approach can be applied to commercial batteries to immediately improve their charging performance, and can be seamlessly integrated into battery management systems. Unlike approaches that necessitate electrode material modifications or electrolyte additives, which require a long development time, this UA-MSCC charging protocol offers a practical and easily applicable solution for improving the battery charging performance. © 2024 by ASME.

关键词： State of charge

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Thermoelectric transport properties of p-type Bi_(2)Se_(3)-Sb_(2)Se_(3)-In_(2)Se_(3) high entropy compounds

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Rare Metals 2024年第7期43卷 3415-3421页

作者： Feng Jiang Cheng-Liang Xia Yong-Bin Zhu Jun Li Yue Chen Wei-Shu Liu Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

The introduction of entropy concept into thermoelectric materials recently has attracted broad ***,we showed the phase diagram of the ternary systems of Bi_(2)Se_(3)-Sb_(2)Se_(3)-In_(2)Se_(3).Among the high entropy compounds (HECs),we have identified an intrinsic p-type region near our previously reported Bi_(0.8)Sb_(0.8)In_(0.4)Se_(3) in the phase diagram.

关键词： entropy (3) compounds

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Modeling asymmetric fracture mechanics of Mg alloy wire in drawing process

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Journal of Magnesium and Alloys 2024年第5期12卷 2057-2069页

作者： Sunghoon Choi Jongwon Shin Joung Sik Suh Dongchoul Kim Department of Mechanical Engineering Sogang UniversitySeoul04107Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

In this study,a numerical analysis was conducted on the ductile fracture of a 2-mm diameter Mg-1Zn-0.5Mn-0.5Sr-0.1Ca alloy wire during *** hexagonally close-packed crystal structure of Mg alloys causes asymmetric fracture behavior,especially in the compression *** aim of this study is to develop a comprehensive damage model for Mg alloy wire that accurately predicts ductile fracture,with a focus on the compression region.A novel experimental method was introduced to measure the ductile fracture of Mg alloy wires under different stress *** wire drawing process was simulated using the Generalized Incremental Stress-State dependent damage(GISSMO)Model and the Semi-Analytical Model for Polymers(SAMP)*** damage model's prediction and the experimental results were found to be in excellent agreement,especially in determining crack *** analysis established a safe zone diagram for die angle and reduction ratio,and experimental validation confirmed the feasibility of this *** proposed damage model can provide a practical and reliable analysis for optimizing the drawing process of Mg alloy wire.

关键词： Mg alloy Wire drawing Finite element method Damage model Safe zone diagram

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Experimental investigation on the mechanical performance of the Al2O3 and ZrO2 added Al-Mg-Si alloy for structural applications

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Proceedings of the Institution of mechanical Engineers, Part E: Journal of Process mechanical engineering 2024年第5期238卷 2223-2234页

作者： Ogunsanya, Olusegun Adebayo Adewale Akinwande, Abayomi Raj Mohan, R. Talabi, Henry Saravana Kumar, M. Vignesh, M. Bhowmik, Abhijit Department of Materials Science and Engineering Hohai University Nanjing China Department of Metallurgical and Materials Engineering Federal University of Technology Akure Nigeria School of Mechanical Engineering SASTRA Deemed to be University Thanjavur India Graduate Institute of Manufacturing Technology National Taipei University of Technology Taipei Taiwan Department of Mechanical Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Chennai India Department of Mechanical Engineering Dream Institute of Technology Kolkata India

The present-day structural application requires advanced materials at extreme conditions, and the development of it is not economically feasible. As a result, existing material in the composite form has more visibility to suit the purpose. The material's strengths and qualities must be examined before it can be recommended for use in harsh conditions. In the present study, Al2O3 (3, 6, 9, 12, and 15 wt.%) and ZrO2 particles (2 wt.%) are reinforced with Al-Mg-Si alloy (Al 6061), which possess good isotropic behaviour and better interface bonding. The double stir casting process was adopted for the hybrid composite development, and the samples were cold rolled to reduce grain size and pores in the composites. The developed composites were subjected to mechanical characterisation tests such as hardness, tensile, compression, impact and flexural tests. An increase in reinforcement percentage enhances the mechanical properties. The improvement was attributed to the high thermal mismatch and reduction in the inter-particle distance by cold rolling and the reinforcements. Scanning electron microscope microstructural examination was conducted, and even dispersion of 3 to 15 wt.% Al2O3 reinforcements was observed. Tensile elongation decreases with an increase in reinforcement percentage. High elastic modulus and temperature mismatch between matrix and reinforcements increase the strength of the composites. The fracture behaviour of the composites generally showed dimples which are characteristics of ductile fracture, except at 15 wt.% Al2O3 / 2 wt.% ZrO2 showed a large portion of cleavage planes and grain cracking. The Al-Mg-Si alloy is reinforced with 9 wt%. Al2O3 / 2 wt.% ZrO2 had the best properties suitable for its use in different structural applications. © IMechE 2023.

关键词： Reinforcement

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Room and cryogenic deformation behavior of AZ61 and AZ61-xCaO(x=0.5,1 wt.%)alloy

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Journal of Magnesium and Alloys 2024年第5期12卷 1996-2009页

作者： Umer Masood Chaudry Hafiz Muhammad Rehan Tariq Nooruddin Ansari Soo Yeol Lee Tea-Sung Jun Department of Mechanical Engineering Incheon National UniversityIncheon 22012Republic of Korea Research Institute for Engineering and Technology Incheon National UniversityIncheon 22012Republic of Korea Department of Materials Science&Engineering Chungnam National UniversityDaejeon 34134Republic of Korea

This study investigates the influence of CaO(0.5,1(wt.%))alloying on the microstructural evolution,texture development and deformation behavior of AZ61 magnesium *** uniaxial tension tests at room(RT)and cryogenic(CT,-150℃)temperature were performed to investigate the twinability and dislocation behavior and its consequent effect on flow stress,ductility and strain hardening *** results showed that the AZ61-1CaO exhibited superior strength/ductility synergy at RT with a yield strength(YS)of 223 MPa and a ductility of 23% as compared to AZ61(178 MPa,18.5%)and AZ61-0.5CaO(198 MPa,21%).Similar trend was witnessed for all the samples during CT deformation,where increase in the YS and decrease in ductility were *** Mtex tools based in-grain misorientation axis(IGMA)analysis of RT deformed samples revealed the higher activities of prismatic slip in AZ61-CaO,which led to superior ***,subsequent EBSD analysis of CT deformed samples showed the increased fraction of fine{10-12}tension twins and nucleation of multiple{10-12}twin variants caused by higher local stress concentration at the grain boundaries,which imposed the strengthening by twin-twin ***,the detailed investigations on strengthening contributors showed that the dislocation strengthening has the highest contribution towards strength in all samples.

关键词： Magnesium Twinning Twinning variant EBSD Cryogenic deformation

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Design and Analysis of Automotive Vehicle Components with Composite materials Using ANSYS 18.1

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Journal of The Institution of Engineers (India): Series D 2024年第3期105卷 1537-1550页

作者： Paul, Subhodeep Roy, Pallab Chatterjee, Arpita Pandit, Pinjal Mukherjee, Rahul Ghosh, Manojit Department of Mechanical Engineering Dr. Sudhir Chandra Sur Institute of Technology and Sports Complex Kolkata India Department of Mechanical Engineering Budge Budge Institute of Technology Kolkata India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Howrah Shibpur India

The unprecedented advancement in the automobile and the automotive sector commenced a little more than a century ago, when comfort, luxury and faster transportation became major requisites of the society. However, it is not the first time the automobile sector has gone through substantial progress to provide people with a greater taste of extravagance. It has evolved from bullock carts to the present era of electric vehicles (EVs) meanwhile providing different stages of the most powerful and intriguing fueled luxury. As the safeguarding of nature is correspondingly a major matter of concern for the subsistence of humankind the fuel engines are gradually being replaced with electric ones. Furthermore, in the beginning, due to the absence of technology and sources, all the analyses were performed practically, which hampered the economy of the project and its development. Nevertheless, the rapidly developing sector of automobile and software technology does not approve such hindrance in the way of development. Thus, new software and artificial intelligence-based technologies were developed for evaluating the practical state of affairs and behaviour of the vehicle and vehicle parts through modelling, simulation and finite element approaches. In this work, the aluminum hybrid metal matrix composite has been developed and used as the piston material of vehicle engines and subsequently analysed to study its behaviour during combustion or power stroke of the engine along with the deformations and stress occurrences on the piston head through finite element approach and study of the motion of piston cylinder setup. The 3D modelling has been done by the SOLIDWORKS platform, whereas CATIA V5 has been used for the motion analysis. During the power stroke, the thermal energy generated in the engine cylinder gets converted into mechanical power, which is provided to the vehicle axle to keep the vehicle in motion. However, at times, the energy generated cannot be utilized for the

关键词： Brakes

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Towards end-to-end structure determination from x-ray diffraction data using deep learning

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npj Computational materials 2024年第1期10卷 1048-1059页

作者： Gabe Guo Judah Goldfeder Ling Lan Aniv Ray Albert Hanming Yang Boyuan Chen Simon J.L.Billinge Hod Lipson Department of Computer Science Columbia UniversityNew YorkNY10027USA Department of Applied Physics and Applied Mathematics Columbia UniversityNew YorkNY10027USA Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC27708USA Department of Mechanical Engineering Columbia UniversityNew YorkNY10027USA

Powder crystallography is the experimental science of determining the structure of molecules provided in crystalline-powder form,by analyzing their x-ray diffraction(XRD)*** many materials are readily available as crystalline powder,powder crystallography is of growing usefulness to many ***,powder crystallography does not have an analytically known solution,and therefore the structural inference typically involves a laborious process of iterative design,structural refinement,and domain knowledge of skilled experts.A key obstacle to fully automating the inference process computationally has been formulating the problem in an end-to-end quantitative form that is suitable for machine learning,while capturing the ambiguities around molecule orientation,symmetries,and reconstruction *** we present an ML approach for structure determination from powder diffraction *** works by estimating the electron density in a unit cell using a variational coordinate-based deep neural *** demonstrate the approach on computed powder x-ray diffraction(PXRD),along with partial chemical composition information,as *** evaluated on theoretically simulated data for the cubic and trigonal crystal systems,the system achieves up to 93.4%average similarity(as measured by structural similarity index)with the ground truth on unseen materials,both with known and partially-known chemical composition information,showing great promise for successful structure solution even from degraded and incomplete input *** approach does not presuppose a crystalline structure and the approach are readily extended to other situations such as nanomaterials and textured samples,paving the way to reconstruction of yet unresolved nanostructures.

关键词： structure powder crystalline

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