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2021 International Conference on Applied Mathematics, Modeling and Computer Simulation, AMMCS 2021

作者： Qi, Yuan Jiang, Xiatian Su, Xubin Jiang, Jie School of Material Science and Engineering Xiangtan University Xiangtan China School of Mechanical Engineering Xiangtan University Xiangtan China School of Automation and Electronic Information Xiangtan University Xiangtan China

ISBN: (纸本)9781643682549

Music, as a kind of cultural heritage, has become an indispensable element in human life. How to intuitively understand the role of music in human collective has become a difficult issue in the field of music research. In this paper, a quantitative model of music influence, which is based on directed graph, Euclidean distance and correlation analysis, is proposed for the development of some genres. In this model, the influences of genre leaders on music development are obtained by evaluating the parameters of the directed graph among artists. Then, the similarity analysis of music within and between schools is con-ducted to get the musical characteristics of different schools. Then the correlation analysis of music features is carried out by SPSS to get the most 'infectious' index of music. Finally, based on the time series, the visual analysis of music evolution is made to quantify the influence of music. In this paper, we've verified the model for many times according to the music development results, which proves that the model has strong guidance for the analysis of music development. © 2022 The authors and IOS Press.

关键词： Directed graphs

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Precursors of material Nonlinearities in Peridynamic Plates 2nd

Precursors of Material Nonlinearities in Peridynamic Plate...

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2nd GIMC-SIMAI Workshop for Young Scientists, 2024

作者： Damian, Sofia Cavuoto, Riccardo Pugno, Nicola M. Fraldi, Massimiliano Deseri, Luca Department of Civil Environmental and Mechanical Engineering University of Trento Trento Italy Department of Structures for Engineering and Architecture University of Naples "Federico II" Naples Italy Laboratory for Bioinspired Bionic Nano Meta Materials & Mechanics University of Trento Trento Italy School of Engineering and Materials Science Queen Mary University London London United Kingdom University of Naples "Federico II" Naples Italy Département de Physique LPENS École Normale Supérieure-PSL Paris France Department of Mechanical Engineering and Material Sciences SSoE University of Pittsburgh PittsburghPA United States Department of Civil and Environmental Engineering Carnegie Mellon PittsburghPA United States Department of Mechanical Engineering Carnegie Mellon PittsburghPA United States

ISBN: (纸本)9783031765902

Load-bearing interconnected microstructured solids, such as concrete, paper, and bone, have an inherently size-dependent mechanical behavior, that is shown over specific length scales. In peridynamics, this measure is called the horizon and it controls void nucleation, coalescence, and fracture transition. Stemming from a through-thickness dimensionally-reduced bond-based peridynamic model recently proposed, this work analyzes the elastic behavior of thin plates made of highly interlaced solid materials. The internal actions, corresponding to the application of specific loading conditions, have been derived from such a model and compared with (i) FEM analyses, and (ii) with the outcomes of a previously available peridynamic approach. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Elasticity

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Effect of Ultra-Audio Frequency Pulse Energy on the Growth Mechanism and Corrosion Properties of Az31b Ceramic Coating by Micro-Arc Oxidation

SSRN

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SSRN 2024年

作者： Xue, Lin Wu, Chaofeng Zhu, Haitao Yang, Lin Liang, Yongmei Peng, Zhenzhen Liu, Ying Wang, Dianlong Hebei Key Laboratory of Material Near-Net Forming Technology School of Material Science and Engineering Hebei University of Science and Technology Shijiazhuang050018 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China

To understand its mechanistic contribution to the growth of micro-arc oxidation (MAO), direct current (DC) and Ultra-audio FrequencyPulse (UFP, ＞20 kHz) were employed to produce MAO upon surface of AZ31B magnesium alloys. The SEM/EDS, XRD, laser confocal and electrochemical test were analyzed to illustrate the impact of UFP on the microstructure, growth mechanism and corrosion resistance of MAO coatings. The results show that the micropore size on surface of the film decreased and the uniformity of the film was improved by using the UFP. When the pulse frequency increases from 50kHz to 150kHz, the number of micropores with the small area (≤1 μm2) increase and the micropores with large area (>3 μm2) disappear. Moreover, the cross-section SEM micrograph confirmed that the MAO coating under UFP conditions were divided into an internal barrier layer, an intermediate dense layer and an external porous layer with good surface uniformity. As the pulse frequency increases, the thickness of the internal barrier layer and intermediate dense layer of the MAO increased. Compared with the substrate, the self-corrosion potential of the UFP-MAO increased by 1.5V, the corrosion current density reduced by 3 orders of magnitude, and the polarization resistance increased by 4 orders of magnitude. Thereby, the corrosion resistance of the UFP-MAO was greatly improved. These findings are anticipated to provide new insights to prepare high-quality MAO coatings to tackle the corrosion challenges of Mg alloys. © 2024, The Authors. All rights reserved.

关键词： Corrosion resistance

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Strengths,weaknesses,opportunities,and threats(SWOT)analysis of supercapacitors:A review

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Journal of Energy Chemistry 2023年第4期79卷 611-638页

作者： Pragati A.Shinde Qaisar Abbas Nilesh R.Chodankar Katsuhiko Ariga Mohammad Ali Abdelkareem Abdul Ghani Olabi Sustainable Energy&Power Systems Research Centre RISEUniversity of SharjahP.O.Box 27272SharjahUnited Arab Emirates International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukuba 305-0044Japan Department of Energy and Material Engineering Dongguk University-SeoulSeoul 04620Republic of Korea Graduate School of Frontier Sciences The University of Tokyo5-1-5 KashiwanohaKashiwaChiba 277-8561Japan Mechanical Engineering and Design School of Engineering and Applied ScienceAston UniversityAston TriangleBirmingham B47ETUK School of Computing Engineering and Physical SciencesUniversity of The West of ScotlandGlasgowPA12BEUK

The development of clean and sustainable energy sources has received widespread interest in the past few decades due to the rolling energy demands while extenuating the rising tiers of greenhouse gases and environmental *** to their intermittent nature,these green and sustainable sources require appropriate energy storage *** different energy storage technologies,electrochemical energy storage devices,particularly supercapacitors(SCs),have fascinated global attention for their utilization in electric vehicles,power supports,portable electronics,and many others application requiring electric energy devices for their ***,the growth of SCs in the commercial market has squeezed requirements,and further developments are obligatory for their effective *** the meantime,SCs also face technical complications and contests for their introduction in industrial settings because of their low energy density and high Levelized *** present study combines core strengths,weaknesses,opportunities,and threats(SWOT)analysis of SCs with new perspectives and recent *** challenges and the future progressive prospects of SCs are also presented in *** review will afford consistent direction and new superhighways for the further development of SCs as standalone and complementary energy storage systems.

关键词： Supercapacitors Energy storage Strengths Opportunities

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Effects of Chromium on the Microstructures and mechanical Properties of AlCoCrxFeNi2.1 Eutectic High Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1565-1573页

作者： Hui Jiang Li Li Rui Wang Kaiming Han Quanwei Wang College of Mechanical and Electronic Engineering Shandong University of Science and Technology266590 QingdaoChina Yangzhou Fengming Photoelectric New Material Co.Ltd 225100 YangzhouChina

In the present study,a series of AlCoCrxFeNi2.1(x=0,0.25,0.5,0.75,1.0)eutectic high entropy alloys(EHEAs)have been designed and *** the effect of Cr content on the microstructures and mechanical properties of the AlCoCrxFeNi2.1 alloys was systematically *** results indicate that the AlCoCrxFeNi2.1(x>0)alloys exhibit almost complete lamellar eutectic microstructures with a mixture structure of FCC and B2 *** the AlCoFeNi2.1 alloy without Cr element exhibited a hypoeutectic microstructure with a primary B2 *** addition,the eutectic microstructures for AlCoCrxFeNi2.1 eutectic alloys do not change *** room temperature compressive tests results show that with an increase in Cr content(from x=0 to x=1.0),the yield strength will first decrease,and thereafter *** trend is the opposite with the fracture strength and plastic *** show an increase trend at first,and then *** AlCoCr0.5 FeNi2.1(Cr0.5)alloy shows the best comprehensive mechanical *** tensile yield strength,fracture strength,and elongation are 536.5 MPa,1062 MPa,and 13.8%,***,the Cr0.5 alloy also displays a high strength with a yield strength of 362 MPa at 700℃.In summary,by changing the Cr content,AlCoCrxFeNi2.1 eutectic high entropy alloys with excellent comprehensive mechanical properties were obtained and prepared.

关键词： Eutectic High entropy alloy Compressive properties Tensile strength

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Parameter Identification of Nonlinear Systems Using Generalized Associated Linear Equations (GALEs)

Parameter Identification of Nonlinear Systems Using Generali...

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International Conference on Industrial Artificial Intelligence (IAI)

作者： Wenbo Zhang Xiaoyue Guo Bo Zhang Yunpeng Zhu Liangliang Cheng Zhike Peng School of Mechanical Engineering Ningxia University Yinchuan China School of Engineering and Material Science Queen Mary University of London London UK Faculty of Science and Engineering Engineering and Technology InstituteGroningen University of Groningen Groningen The Netherlands

ISBN: (数字)9798350356618

ISBN: (纸本)9798350356625

For a weakly nonlinear system described by Volterra series, if the nonlinear differential equation (NDE) model of the system is unique, the nonlinear auto-regressive with exogenous input (NARX) model identified based on the input and output data of that system is not unique. Fortunately, the NDE model and the NARX model of the same nonlinear system have unique frequency domain representations, e.g., generalized frequency response functions (GFRFs), so these two models also have the same nonlinear output response spectrum. And the generalized associated linear equations (GALEs) theory can be used to directly calculate the arbitrary order nonlinear output response of the system according to the parameters of the NDE model or the NARX model. Therefore, this paper proposes a parameter identification method of the NDE model for the nonlinear system based on GALEs. Firstly, the NARX model of the system is identified according to the input and output data generated by the NDE model of the system with unknown parameters. Secondly, the GALEs of the NDE model containing the unknown parameters are determined. Finally, the unknown parameters in the NDE model are identified based on the principle that the NDE model and the NARX model of the same system have the same nonlinear output response spectrum. The method is convenient and effective, and provides a new idea for parameter identification of NDE models of nonlinear systems.

关键词： Parameter estimation Frequency-domain analysis Noise Differential equations Interference Mathematical models Data models Frequency response Nonlinear systems Artificial intelligence

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Electronically Conducting Titania Single Crystals Prepared by Flash Exhibit Memristor Switching

SSRN

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SSRN 2024年

作者： Jo, Seohyeon Raj, Rishi Materials Science Engineering Program Department of Mechanical Engineering University of Colorado Boulder BoulderCO80309 United States

We report memristor behavior in bar shaped single crystals of titania that have been "formed" into electronic conductors. The cycling experiments are carried out with forward and reverse current, rather than voltage;the current experiments are more reproducible. The single crystals permit in-situ measurements of interface as well as the end-to-end resistivities by the four-point method. The total specimen resistance is shown to be nearly equal to the sum of the interface resistances at the positive and negative electrodes referenced at the forming step. The memristor effect arises predominantly from the change in the interfacial resistance at the positive electrode which shows local ratio of high/low resistance of x103. The resistance at the opposite interface remains unchanged. The effect at the positive electrode is attributed to a change in the state of exciton-like electron-hole configurations under the local field induced by the current. The memristor effect is sensitive to crystal-orientation. © 2024, The Authors. All rights reserved.

关键词： Memristors

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Characterization of Nanocomposite Membrane Based Bacterial Cellulose Made of Pineapple Waste Reinforced by Graphite Nanoplatelets

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Journal of Renewable materials 2022年第9期10卷 2465-2475页

作者： Heru Suryanto Bili Darnanto Susilo Jibril Maulana Aminnudin Uun Yanuhar Surjani Wonorahardjo Husni Wahyu Wijaya Abu Saad Ansari Center of Excellence for Cellulose Composite(CECCom) Department of Mechanical EngineeringUniversitas Negeri MalangMalang65145Indonesia Centre of Advanced Material for Renewable Energy(CAMRY) Universitas Negeri MalangMalang65145Indonesia Master Program of Mechanical Engineering Faculty of EngineeringUniversitas Negeri MalangMalang65145Indonesia Department of Aquatic Resources Management Faculty of Fisheries and Marine SciencesBrawijaya UniversityMalang65145Indonesia Department of Chemistry Faculty of Mathematics and Natural SciencesUniversitas Negeri MalangMalang65145Indonesia Department of Materials Science&Engineering Incheon National UniversityIncheon464-742South Korea

Waste is the main problem for the *** waste for various useful applications has a benefit for the *** work has been studied for handling pineapple peel waste to make composite film bacterial cellulose nanocomposite membrane(BCNM)with addition graphite nanoplatelet(GNP).The concentration of GNP in the membrane influence the membrane *** bacterial cellulose(BC)pellicle was synthesized by using media from pineapple peel waste *** pellicle is cleaned with water and NaOH solution to be free from *** is synthesized through the mechanical disintegration *** results of disintegration using high pressure homogenizer at 150 bar and five ***/GNP is synthesized with varying addition of GNP of 2.5,5.0,10 and 100 wt%of dry bacterial nanocellulose(BNC).The BC and GNP solution were dried in an oven for 14 h at 80℃.BCNM morphology was observed using *** is dispersed and distributed in the BC matrix as *** analysis shows many peaks of BNC less pronounced with increasing of *** higher concentration of GNP,the rougher of *** optimum tensile strength of BCNM was achieved after addition GNP of 2.5 wt%.

关键词： Bacterial nanocellulose graphite nanoplatelet membrane nanocomposite pineapple waste

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Pineapple Waste-Derived Carbon as a Metal Free Catalyst in Zinc-Air Battery 7

Pineapple Waste-Derived Carbon as a Metal Free Catalyst in Z...

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7th International Conference on Electric Vehicular Technology, ICEVT 2022

作者： Adios, Celfi Gustine Hamid, Faiq Haidar Safira, Adiska Nur Irmawati, Yuyun Sumboja, Afriyanti Institut Teknologi Bandung Material Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Bandung Indonesia Research Center for Nanoscience and Nanotechnology Institut Teknologi Bandung Bandung Indonesia Research Center for Advanced Material Tangerang Selatan Indonesia

ISBN: (数字)9781665409421

ISBN: (纸本)9781665409421

Catalysts made from biomass are promising oxygen catalysts for zinc-Air batteries (ZABs) because of their inexpensive cost and long-Term availability. In this study, we utilize pineapple waste (crown and core) to produce a metal-free oxygen reduction catalyst through a facile potassium hydroxide activation and pyrolysis treatment at 800 °C. Both produced catalysts have a porous structure. The C-Pineapple Core catalyst, on the other hand, has a greater double-layer capacitance (Cdl) of 1.75 mF, suggesting that there are more active sites present than on the C-Pineapple Crown catalyst (1.3 mF). The electrochemical performance test in 0.1 M KOH electrolyte demonstrates that the C-Pineapple Core and C-Pineapple Crown catalysts have a good oxygen reduction reaction (ORR) activity, with onset potentials vs. RHE of 0.95 V and 0.91 V, respectively. An air cathode ZAB constructed with the C-Pineapple Core catalyst could deliver a power density of 85.75 mW cm-2 with an outstanding cycling behavior over 504 cycles (168 h). This research turns agricultural waste into a metal-free oxygen catalyst with good stability. © 2022 IEEE.

关键词： Carbon

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Progress of LISAP-MSE: A Concept of Producing Aluminum In-Situ on the Moon through Molten Salt Electrolysis

Progress of LISAP-MSE: A Concept of Producing Aluminum In-Si...

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AIAA Aviation Forum and ASCEND, 2024

作者： Ortega, Jacob N. Bayless, David Stutts, Daniel Han, Daoru Sander, Todd P. Smith, Jeffrey Rezaei, Fateme Schonberg, William Missouri University of Science and Technology Department of Mechanical and Aerospace Engineering 400 W. 13th Street RollaMO65409 United States Missouri University of Science and Technology Department of Material Science and Engineering 1400 N. Bishop RollaMO65409 United States Missouri University of Science and Technology Department of Chemical and Biochemical Engineering 1101 N. State Street RollaMO65409 United States Missouri University of Science and Technology Department of Civil Architectural and Environmental Engineering 1401 N. Pine Street RollaMO65409 United States

ISBN: (数字)9781624107160

ISBN: (纸本)9781624107160

This paper presents a concept of producing aluminum in-situ on the lunar surface, namely, the Lunar In-Situ Aluminum Production through Molten Salt Electrolysis (LISAP-MSE) method developed at Missouri University of science and Technology. This paper aims to demonstrate the use of electro-deoxidation to reduce aluminum oxide (i.e., alumina) into aluminum and oxygen gas via electrolysis in a molten salt bath for the production of aluminum on the Moon. It is shown that with a steady supply of hydrogen chloride, this in-situ resource utilization (ISRU) method could supply several necessary materials consumed in the electro-deoxidation process except hydrogen chloride to produce aluminum metal, oxygen, water, and silica from anorthite found in lunar highland regions. In this paper, the Missouri S&T team thermally and chemically reduce anorthite, an aluminum rich mineral commonly found in the lunar highlands, and successfully tested and electrolytic cell that was produced in house. The results show that acid leaching and thermal decomposition were successful. However, more work needs to be done to increase the efficieny of the overall process. © 2024, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Catalytic cracking

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