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Investigation into the Size Distribution of Al2O3-ZnO Nanoparticles Dispersed in DI Water and Following the Impact of CNTs on the Stability, Heat Transfer, and Electricity Transfer of Al2O3-ZnO-CNT Hybrid Nanofluid

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Defect and Diffusion Forum 2022年 420卷 172-192页

作者： Javadipour, Soroush Shokuhfar, Ali Homayouni, Keyvan Heidary, Zeinab Rezaei, Fatemeh Faculty of Materials Science and Engineering K. N. Toosi University of Technology 15 Pardis S t. Tehran*** Iran Department of Petroleum Engineering Science and Research Branch Islamic Azad University Tehran14515-775 Iran Department of Mechanical Engineering K. N. Toosi University of Technology 15 Pardis S t. Tehran*** Iran Department of Physics K. N. Toosi University of Technology Shahid Kavian St. Tehran15875-4416 Iran

The stability of dispersed nanoparticles in the base fluid has always been one of the most important challenges in using nanofluids as a coolant in heat transfer applications in different industries such as modern electronic equipment, heat exchangers, solar technologies, etc. In the present study, the dynamic light scattering (DLS) method is used to obtain the particle size distribution of Al2O3-ZnO dispersed in DI water. After adjusting the optical arrangement and designing the DLS setup, the correlation curves are plotted by analyzing the detected signals of the experiments. Then, a decay rate is derived by fitting an exponential function to the correlation curve to get the particle size distribution by using the Stoke-Einstein equation. In order to investigate the stability of Al2O3-ZnO water-based nanofluid, the particle size distribution profiles are studied several times. In addition, the stability of Al2O3-ZnO-CNT hybrid nanofluid is followed by absorbance measurements using a UV-Vis spectrophotometer. Moreover, the thermal conductivity coefficient and electrical conductivity of the Al2O3-ZnO hybrid nanofluid with and without CNT particles are determined by utilizing KD2 Pro and PCT-407 devices, respectively. The results showed that the peak in the particle size distribution curve for Al2O3-ZnO hybrid nanofluid shifted from 476 nm to 128 nm after 5 days. Furthermore, the inclusion of carbon nanotubes increased the stability of zinc oxide particles in the nanofluid. In addition, by adding carbon nanotubes in a ratio of 1:1:0.5 to Al2O3ZnO nanofluid and forming 0.05 wt.% hybrid nanofluid, the thermal conductivity coefficient was enhanced by 30% in comparison with deionized water, while a 0.05 wt.% hybrid nanofluid without CNT particles improved the thermal conductivity by 19%. Although the electrical conductivity increased by adding nanoparticles to the base fluid, it didn’t change significantly for nanofluids containing CNTs compared to nanofluids without CNT

关键词： Particle size

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MeshDMP: Motion Planning on Discrete Manifolds using Dynamic Movement Primitives

arXiv

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arXiv 2024年

作者： Vedove, Matteo Dalle Abu-Dakka, Fares J. Palopoli, Luigi Fontanelli, Daniele Saveriano, Matteo Department of Industrial Engineering Università di Trento Trento Italy DRIM Italy Mechanical Engineering Program Division of Engineering New York University Abu Dhabi Abu Dhabi United Arab Emirates Department of Information Engineering and Computer Science Università di Trento Trento Italy

An open problem in industrial automation is to reliably perform tasks requiring in-contact movements with complex workpieces, as current solutions lack the ability to seamlessly adapt to the workpiece geometry. In this paper, we propose a Learning from Demonstration approach that allows a robot manipulator to learn and generalise motions across complex surfaces by leveraging differential mathematical operators on discrete manifolds to embed information on the geometry of the workpiece extracted from triangular meshes, and extend the Dynamic Movement Primitives (DMPs) framework to generate motions on the mesh surfaces. We also propose an effective strategy to adapt the motion to different surfaces, by introducing an isometric transformation of the learned forcing term. The resulting approach, namely MeshDMP, is evaluated both in simulation and real experiments, showing promising results in typical industrial automation tasks like car surface polishing. © 2024, CC BY-SA.

关键词： Mesh generation

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高密度金属间化合物纳米颗粒强化型单晶高熵超合金的高温氧化行为

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science China materials 2023年第11期66卷 4239-4250页

作者：肖维城鞠江刘少飞肖博周英豪开执中赵怡潞杨涛 Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Hong Kong Branch of National Precious Metals Material Engineering Research Centre(NPMM) City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong Kong 999077China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China

本文系统研究了单晶L_(12)强化富Co高熵超合金Co_(41)Ni_(35)Al_(11.5)-Ta_(2.5)Cr_(4)Ti_(6)(at%)在空气中800,900和1000℃下的氧化行为.结果表明,该合金在800至1000℃范围内均表现出优异的抗氧化性.其中,在800℃氧化后,合金表面形成... 详细信息

本文系统研究了单晶L_(12)强化富Co高熵超合金Co_(41)Ni_(35)Al_(11.5)-Ta_(2.5)Cr_(4)Ti_(6)(at%)在空气中800,900和1000℃下的氧化行为.结果表明,该合金在800至1000℃范围内均表现出优异的抗氧化性.其中,在800℃氧化后,合金表面形成了双层氧化膜,由TiO_(2)/Al_(2)O_(3)混合层和Cr_(2)O_(3)层组成.连续但不致密的Cr_(2)O_(3)层不能有效抑制内部氧化和内部氮化.在900和1000℃时形成复杂的分级结构氧化膜,主要成分为尖晶石、Cr_(2)O_(3)、TiTaO_(4)和Al_(2)O_(3).值得注意的是,在900至1000℃的温度范围内发现抗氧化性出现了反常提高.具体来说,在1000℃下形成的更复杂和连续的五层氧化层,特别是底部的连续致密的Al_(2)O_(3)层,赋予合金在1000℃下优异的抗氧化性.

关键词： high-entropy superalloy high-temperature oxidation FIB-TEM oxide scale oxidation diffusion

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Exergy, Energy and Co2 Emission Investigations of Eurotrough-150 Solar System with Wind Speed Variations and Non-Newtonian Nanofluid

SSRN

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SSRN 2023年

作者： Aliehyaei, Mehdi Nabaei, Seyed Hamidreza Ashtari, Mehrdad Department of Mechanical Engineering University of Tabriz Tabriz Iran Department of Mechanical Engineering and Materials Science University of Pittsburgh Benedum Hall 3700 O’Hara Street PittsburghPA15261 United States Department of Mechanical Engineering Pardis Branch Islamic Azad University Pardis Iran

Parabolic trough solar collectors have been introduced as a suitable alternative to fossil fuels. This paper investigates the performance of the EuroTrogh-150 collector for six absorber tubes where the absorber tubes are installed in series. The analyzes of energy, exergy, environmental, enviroeconomic, exergoenvironmental and exergoenviroeconomic are considered. The effect of high wind speed and non-Newtonian nanofluid (water-CMC/TiO2) on the energy and exergy efficiencies of the collector is investigated. According to the results, energy efficiency, Nusselt number and thermal-hydrodynamic efficiency for the first absorber tube have the highest values, as the speed of the working fluid increases, it is possible to avoid a significant decrease in the energy efficiency in the last tubes. The exergy efficiency has a maximum value for the last absorber tube, as the fluid velocity increases, the increase in exergy efficiency in the last tubes will be higher. According to enviroeconomic and exergoenviroeconomic analyses, the price of CO2 emission for nanofluid decreases by 10.28% and 9.09%, respectively. If the wind speed is low, then the highest amount of energy efficiency and exergy efficiency is obtained. In addition, the sixth absorber tube is more affected by the wind speed than the first absorber tube. © 2023, The Authors. All rights reserved.

关键词： Fossil fuels

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Highly Oriented Crystalline Si on Epitaxial Gd2O3/Si(111) Substrate Using Low-Cost Rf Sputtering for Silicon on Insulator Application

SSRN

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SSRN 2023年

作者： Patil, Shubham Kumar, Sandeep Pandey, Adityanarayan H. Bhunia, Swagata Kamaliya, Bhaveshkumar Sharma, Anand Lashkare, Sandip Mote, Rakesh G. Laha, Apurba Deshpande, Veeresh Ganguly, Udayan Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai400076 India Department of Mechanical Engineering Indian Institute of Technology Bombay Mumbai400076 India Department of Metallurgical Engineering and Materials Science

Silicon-on-Insulator (SOI) technology has been the center of attraction with the advancement in RF technology and the advent of Internet-of-Things due to its low-power operation with reduced parasitic and short-channel effects. However, the state-of-the-art smart-cut method used for the SOI wafer is costly. Alternatively, the notion of using the Si channel layer on epitaxial rare-earth oxide has been proposed. In literature, the existing techniques used to achieve the same, such as Molecular beam Epitaxy (MBE) or reduced-pressure chemical vapor deposition technique (RPCVD), are either costly or non-high-volume manufacturable. In this context, we propose a method to fabricate the highly oriented crystalline Si (111) channel layer (Top-Si) on an epitaxial buried oxide (BOX)Gd2O3/Si (111) virtual substrate utilizing the solid phase epitaxy using the high-volume manufacturing friendly (HVM), low-cost RF magnetron sputtering technique. First, we have shown the highly oriented crystalline Si and epitaxial Gd2O3 layer grown on Si (111) substrate, as confirmed using high-resolution X-ray diffraction (HRXRD) and Transmission Electron Microscopy (TEM). Second, we investigated the impact of rapid thermal annealing at 850 oC on the heterostructure using HRXRD and TEM. It is observed that the high-temperature annealing transforms the Top-Si layer into the highly oriented crystalline Si (111) layer by fusing smaller grains towards larger grains. Hence, we demonstrate a low-cost, HVM-friendly technique for the fabrication of SOXI wafers. © 2023, The Authors. All rights reserved.

关键词： Gadolinium compounds

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A Bread Board Model Testing for In-Space Flight Demonstration of a Liquid-Propellant Detonation Engine System

A Bread Board Model Testing for In-Space Flight Demonstratio...

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AIAA SciTech Forum and Exposition, 2024

作者： Kawasaki, Akira Nakata, Kotaro Sato, Tomoki Sawada, Satoru Kudo, Yusuke Suzuki, Yamato Itouyama, Noboru Matsuoka, Ken Matsuyama, Koichi Kasahara, Jiro Nakata, Daisuke Namera, Mio Eguchi, Hikaru Uchiumi, Masaharu Matsuo, Akiko Funaki, Ikkoh Nakamura, Shuichi Higashino, Kazuyuki Hirashima, Hidetoshi Department of Mechanical Engineering Shizuoka University Hamamatsu Shizuoka432-8561 Japan Nagoya University Aichi Nagoya464-8603 Japan Department of Aerospace Engineering Nagoya University Aichi Nagoya464-8603 Japan Institute of Materials and Systems for Sustainability Nagoya University Aichi Nagoya464-8603 Japan Aerospace Plane Research Center Muroran Institute of Technologu Keio University Kanagawa Yokohama223-8522 Japan Division of Production Systems Engineering Muroran Institute of Technologu Keio University Kanagawa Yokohama223-8522 Japan Department of Mechanical Engineering Keio University Kanagawa Yokohama223-8522 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Kanagawa Sagamihara252-5210 Japan Technical Development Division Nakamura Engineering and Trading Service Saitama Sakado350-0233 Japan Department of Aerospace Systems Engineering Sojo University Kumamoto860-0082 Japan

ISBN: (数字)9781624107115

ISBN: (纸本)9781624107115

In-space flight demonstration of a rotating detonation engine system using liquid nitrous oxygen and liquid ethanol as the propellant (DES-2) is planned in FY2024 by a collaborative research group of Nagoya University, Shizuoka University, Keio University, the Muroran Institute of Technology, and Institute of Space and Astronautical science at the Japan Aerospace Exploration Agency (ISAS/JAXA). In this manuscript, a ground combustion test of the bread board model (BBM) of the DES-2, which has been conducted in May 2023, is briefly described. In the testing, the DES-2 BBM was operated in stand-alone mode and achieved detonation combustion as planned. © 2024 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Space research

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A Novel,Amorphous,Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and mechanical Properties

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1057-1063页

作者： Xigang Yang Yun Zhou Ruihua Zhu Shengqi Xi Cheng He Hongjing Wu Yuan Gao State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi'an 710049China School of Medical Information and Engineering Southwest Medical UniversityLuzhou 646000China

The exceptional corrosion resistance and mechanical properties of high-entropy metallic glasses(HE-MGs)are highly desirable for diverse critical ***,a long-standing problem of these alloys is that their alloy design approaches are based on limited equiatomic or near-equiatomic *** this study,a novel senary alloy(non-equiatomic Fe3 Cr2 Al2 CuNi4 Si5)with amorphous structure was *** alloy exhibited exceptional corrosion resistance and Vickers hardness as high as^1150 Hv at room *** processing route involved amorphous powder molding via a mechanical alloying and ultrahigh pressure consolidation technique,resulting in an optimal microstructure of amorphous structure with nanoparticles uniformly distributed in the matrix *** approach can effectively inhibit the crystallization of amorphous structure,thus providing a general pathway for manufacturing next-generation non-equiatomic HE-MGs with both exceptional corrosion resistance and strength.

关键词： Alloying Metallic glasses Corrosion resistance mechanical alloying High-entropy metallic glasses

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Visualizing separation at composite interfaces via spirolactam mechanophores †

RSC Mechanochemistry

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RSC Mechanochemistry 2024年第2期2卷 178-183页

作者： Jared A. Gohl Tyler J. Roberts Anna C. Freund Nazmul Haque Lisa M. Rueschhoff Luke A. Baldwin Chelsea S. Davis School of Materials Engineering Purdue University West Lafayette Indiana 47906 USA School of Chemical Engineering Purdue University West Lafayette Indiana 47906 USA Department of Material Science and Engineering University of Delaware Newark Delaware 19716 USA ChelseaD@UDel.edu Air Force Research Laboratory Materials and Manufacturing Directorate Wright-Patterson AFB Ohio 45433 USA Department of Mechanical Engineering University of Delaware Newark Delaware 19716 USA

The failure of interfaces between polymers and inorganic substrates often leads to deteriorated performance, as is the case for polymer matrix composites. Interfacial mechanophores (iMPs) have the potential to fluorescently measure interfacial failures. Spirolactam-based mechanophores are of interest due to their readily available synthetic precursors and compatibility with epoxy matrices. In this work, spirolactam is covalently bound at the interface of silica surfaces and epoxy, chosen due to the industrial relevance of glass fiber composites. The iMPs are mechanically activated through uniaxial tension applied to the composite while the resulting fluorescent response is observed in situ with a confocal microscope. Due to their real time sensing capabilities, iMPs are a promising technique to measure interfacial failures in composite materials more easily than with traditional optical microscopy techniques.

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A Physics-Informed Deep Learning Description of Knudsen Layer Reactivity Reduction

arXiv

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arXiv 2024年

作者： McDevitt, Christopher J. Tang, Xian-Zhu Nuclear Engineering Program Department of Materials Science and Engineering University of Florida GainesvilleFL32611 United States Theoretical Division Los Alamos National Laboratory Los Alamos NM87545 United States

A physics-informed neural network (PINN) is used to evaluate the fast ion distribution in the hot spot of an inertial confinement fusion target. The use of tailored input and output layers to the neural network is shown to enable a PINN to learn the parametric solution to the Vlasov-Fokker-Planck equation in the absence of any synthetic or experimental data. As an explicit demonstration of the approach, the specific problem of Knudsen layer fusion yield reduction is treated. Here, predictions from the Vlasov-Fokker-Planck PINN are used to provide a non-perturbative solution of the fast ion tail in the vicinity of the hot spot thus allowing the spatial profile of the fusion reactivity to be evaluated for a range of collisionalities and hot spot conditions. Excellent agreement is found between the predictions of the Vlasov-Fokker-Planck PINN and results from traditional numerical solvers with respect to both the energy and spatial distribution of fast ions and the fusion reactivity profile demonstrating that the Vlasov-Fokker-Planck PINN provides an accurate and efficient means of determining the impact of Knudsen layer yield reduction across a broad range of plasma conditions. © 2024, CC BY.

关键词： Deep learning

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Surface-tuned two-dimension MXene scaffold for highly reversible zinc metal anode

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Chinese Chemical Letters 2021年第9期32卷 2899-2903页

作者： Xiaoyu Liu Yongzheng Fang Pengcheng Liang Jiahao Xu Bo Xing Kai Zhu Yuyu Liu Jiujun Zhang Jin Yi Department of Chemistry&Institute for Sustainable Energy Shanghai UniversityShanghai 200444China Key Laboratory of Superlight Materials and Surface Technology(Ministry of Education) College of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China College of Mechanical and Electrical Engineering Jiaxing UniversityJiaxing 314001China

Zinc metal has aroused increasing interest as anode material of Zn-based batteries for their energy storage ***,the uneven Zn stripping/plating processes induce severe dendrite growth,leading to low Coulombic efficiency and safety ***,a surface-tuned two-dimensional(2D)MXene Ti_(3)C_(2)Tx scaffold as a robust skeleton is developed to facilitate the uniform Zn stripping/*** Ti_(3)C_(2)Tx with high electrical conductivity and unique structure provides fast ionic-transport paths,promising even Zn2+stripping/plating *** suppressed Zn dendrite growth and uniform nucleation,the proposed 2D Ti_(3)C_(2)Tx scaffold for Zn metal anode delivers a low voltage hysteresis of 63 m V and long lifespan over 280 *** surface-tuned engineering strategy demonstrates the potential application of Zn anode with MXene skeleton for next-generation Zn-based batteries.

关键词： MXene Surface-tuned engineering Nucleation Zn anodes Zn ion batteries

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