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Journal of Alloys and Metallurgical Systems 2024年 7卷

作者： Ogbezode, Joseph Ekhebume Offia-Kalu, Nkechi Elizabeth Bello, Abdulhakeem Anye, Vitalis Chioh Onwalu, Peter Azikiwe Department of Materials Science and Engineering African University of Science and Technology Abuja Nigeria Department of Theoretical and Applied Physics African University of Science and Technology Abuja Nigeria Department of Mechanical Engineering University of Ibadan Ibadan Nigeria Department of Mechanical Engineering Edo State University Uzairue Edo State Uzairue Nigeria Department of Polymer and Textile Engineering Federal University of Technology Imo State Owerri Nigeria Electrical and Electronic Engineering Science University of Johannesburg Johannesburg South Africa

The various methods of synthesis of iron oxide nanoparticles (IONPs) have been extensively studied in several works of literature. These methods include physical, chemical, and biological nanosynthesis methods with applications in water filtration, environmental remediation, plant improvements, biomedicines, etc. These nanosynthesis approaches revolve around their mode of application, nanomaterial properties, and characterization mechanisms, while little effort has been made to investigate the effect of nanosynthesis parameters based on phase transformation and growth mechanisms of such IONPs. The parameters, which are physical, chemical, mechanical, mineralogical, and morphological, have proven to have tremendous implications on the magnetic behaviors, crystalline size, degree of crystallinity, lattice stain, and mechanical strength of the synthesized IONPs. Thus, this paper gives an overview of the effect of selected nanosynthesis parameters, potential mechanisms of the phase transformation, nanomaterial characterization, and growth mechanism of IONPs produced via the mechanochemical route. The study also suggests future perspectives on the need for further study on the reduction-oxidation process, reaction kinetics, and growth mechanism as influencing factors that can affect the phase structure transformation and alteration of magnetic properties of mechanochemically synthesized IONPs at various levels for suitability in nanotechnology advancement and applications in various fields. © 2024 The Authors

关键词： Water filtration

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Interface Effect of Ru-MoS2 Nanoflowers on Lignin Substrate for Enhanced Hydrogen Evolution Activity

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Energy & Environmental Materials 2021年第1期4卷 117-125页

作者： Yeqing Xu Xingxing Jiang Gonglei Shao Haiyan Xiang Sisi Si Xing Li Travis Shihao Hu Guo Hong Shengyi Dong Huimin Li Yexin Feng Song Liu Institute of Chemical Biology and Nanomedicine (ICBN) State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Institute of Chemical Biology and Nanomedicine State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University College of Chemistry and Chemical Engineering Hunan University Department of Mechanical Engineering California State University Institute of Applied Physics and Materials Engineering Department of Physics and Chemistry Faculty of Science and Technology University of MacauAvenida da Universidade School of Physics Peking University

The catalytic performance of Molybdenum disulfide（MoS2） has been still far from that of Pt-based catalysts for inadequate active sites and sluggish electron transfer kinetics. Through engineering the interface between MoS2-based materials and supported substrates, hybrid Ru-doped MoS2on carbonized lignin（CL） is designed and prepared as efficient catalyst for hydrogen evolution reaction（HER）. The CL substrate not only facilitates the growth of MoS2nanoflowers, but also promotes the electron transfer. Ru doping increases active sites greatly for HER. The hybrid catalyst achieves a low onset overpotential of 25 mV and a low Tafel slope of 46 m V dec-1. The favorable HER activity ascribes to the interfacial interaction between MoS2and CL. Density functional theory calculations further confirm the improved HER performance with doped Ru atoms. This study presents a prototype application to design electrocatalysts with enhanced carrier mobility and high-density active sites based on interface effect.

关键词： carbonized lignin hydrogen evolution reaction interface effect molybdenum disulfide

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Deep Learning Accelerated Phase Prediction of Refractory Multi-Principal Element Alloys

arXiv

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arXiv 2024年

作者： Shargh, Ali K. Stiles, Christopher D. El-Awady, Jaafar A. Department of Mechanical Engineering Johns Hopkins University BaltimoreMD21218 United States Research and Exploratory Development Department Johns Hopkins University Applied Physics Laboratory Laurel United States

The tunability of the mechanical properties of refractory multi-principal-element alloys (RMPEAs) make them attractive for numerous high-temperature applications. It is well-established that the phase stability of RMPEAs control their mechanical properties. In this study, we develop a deep learning framework that is trained on a CALPHAD-derived database that is predictive of RMPEAs phases with high accuracy up to eight phases within the elemental space of Ti, Fe, Al, V, Ni, Nb, and Zr with an accuracy of approximately 90%. We further investigate the causes for the low out of domain performance of the deep learning models in predicting phases of RMPEA with new elemental sets and propose a strategy to mitigate this performance shortfall. © 2024, CC BY.

关键词： Deep learning

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New Trends on Multiphase Flow Simulations Using Slug Capturing Approach 6th

New Trends on Multiphase Flow Simulations Using Slug Capturi...

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6th Multiphase Flow Journey, JEM 2021

作者： Nikfarjam, Farhad Anbarlooei, Hamidreza Cruz, Daniel O. A. Department of Applied Mathematics Institute of Mathematics Federal University of Rio de Janeiro Rio de Janeiro Brazil Mechanical Engineering Program Coppe Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9783030934552

It is well known that the 4-equation formulation of the two-fluid model is ill-posed. As a result, it is impossible to differentiate between the errors originating from uncertainty in the empirical closure models and the nonphysical oscillations due to ill-posedness of the equations. The present work uses a 5-equation formulation, by adding a volume fraction evolution equation, which is unconditionally hyperbolic. To solve the resulting system of equations, a high-resolution Roe’s scheme is developed, and to keep the solution time practical, an adaptive mesh refinement algorithm is implemented. To obtain the wall shear stresses, a novel set of analytically developed friction equations is used for the non-Newtonian liquid phase. Finally, the capability of the developed code has been examined for the terrain slugging cases. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Ill-posed Slug capturing approach Two-fluid model

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Temperature-Dependent Electrical Resistivity in Sn-Bi Alloys

Temperature-Dependent Electrical Resistivity in Sn-Bi Alloys

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International Conference on Electronics Packaging (ICEP)

作者： Xin F. Tan Qichao Hao Jiye Zhou Stuart D. McDonald Keith Sweatman Kazuhiro Nogita School of Mechanical and Mining Engineering The University of Queensland Australia Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Fukuoka Japan Nihon Superior Co. Ltd. Osaka Japan

ISBN: (数字)9784991191176

ISBN: (纸本)9798350385908

Low temperature solders based on the Sn-Bi system have caught the attention of the electronics manufacturing industry as they make possible electronics assembly at lower temperatures, bringing technical, economic, and environmental benefits. However, the solid solubility of Bi in Sn ranges from around 3 wt% at room temperature to 21 wt% at the eutectic temperature of 139°C. This is expected to affect the electrical resistivity of the Sn-Bi alloys as temperature fluctuates during normal operations of electronic devices. This study investigates the change in electrical resistivity of a low temperature solder based on Sn-37wt % Bi with additions of Cu, Ni and Sb. The electrical resistivity of the alloy is found to increase non-linearly with temperature. Overall the resistance is slightly higher than that of the base Sn-37wt%Bi alloy and this is due to the presence of the (Cu,Ni) 6 Sn 5 intermetallic and dissolved Sb in the Sn phase, while being lower than that of the near-eutectic Sn-57wt%Bi alloy.

关键词： Resistance Manufacturing industries Temperature distribution Metals Conductivity Solids Nickel

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Electronic Readout for a 100 ps CTR PET Detector with 24:1 Multiplexing Ratio of Timing Channels

Electronic Readout for a 100 ps CTR PET Detector with 24:1 M...

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2022 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room Temperature Semiconductor Detector Conference, IEEE NSS MIC RTSD 2022

作者： Pourashraf, Shirin Gonzalez-Montoro, Andrea Innes, Derek Cates, Joshua W. Levin, Craig S. Stanford University Department of Radiology StanfordCA94305 United States Lawrence Berkeley National Laboratory Applied Nuclear Physics Program BerkeleyCA94720 United States Stanford University Molecular Imaging Program Departments of Radiology Bioengineering Physics and Electrical Engineering StanfordCA94305 United States

ISBN: (纸本)9781665488723

We have designed a novel electronic readout with 24:1 multiplexing ratio of the timing channels that achieves 100 ps coincidence time resolution. The detector layer units comprise 2×4 arrays of 3×3×10 mm3 "LGSO"crystals side-coupled to 6×4 arrays of 3×3 mm2 SiPMs. To achieve low power dissipation and scalability of this readout design, its effective area is implemented in only 13.3 mm using compact and power efficient electronic components. The measured CTR of the 24:1 multiplexed timing channels (or 8:1 LVDS signals) was 107.0 ± 3.6 ps FWHM using a22Na point-source and a very low timing jitter FPGA-based TDC. © 2022 IEEE.

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Opto2P-FCM: A MEMS Based Miniature Two-Photon Microscope with Patterned Optogenetic Stimulation

Opto2P-FCM: A MEMS Based Miniature Two-Photon Microscope wit...

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Microscopy Histopathology and Analytics, Microscopy 2024 - Part of Optica Biophotonics Congress: Biomedical Optics

作者： Futia, Gregory L. Zohrabi, Mo McCullough, Connor Teel, Alec de Souza, Fabio Simoes Oroke, Ryan Bright, Victor M. Restrepo, Diego Gopinath, Juliet T. Gibson, Emily A. Department of Bioengineering University of Colorado Anschutz Medical Campus AuroraCO80045 United States Department of Cell and Developmental Biology University of Colorado Anschutz Medical Campus AuroraCO80045 United States Department of Electrical Computer and Energy Engineering University of Colorado BoulderCO80309 United States Department of Mechanical Engineering University of Colorado BoulderCO80309 United States Department of Physics University of Colorado BoulderCO80309 United States Materials Science and Engineering Program University of Colorado BoulderCO80309 United States

Miniaturized microscopes for monitoring neural activity are an indispensable tool for neuroscience research. We present a novel MEMS based miniature microscope with patterned optogenetic stimulation capabilities enabl... 详细信息

ISBN: (纸本)9781957171340

关键词： Microscopes

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Carbon-based flexible self-supporting cathode for lithium-sulfur batteries:Progress and perspective

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Carbon Energy 2021年第2期3卷 271-302页

作者： Qinghuiqiang Xiao Jinlin Yang Xiaodong Wang Yirui Deng Peng Han Ning Yuan Lei Zhang Ming Feng Chang‐an Wang Ruiping Liu Department of Materials Science and Engineering China University of Mining and Technology(Beijing)BeijingChina School of Materials Science and Engineering Tsinghua UniversityBeijingChina Department of Mechanical Engineering University of Alaska FairbanksFairbanksAlaskaUSA Department of Applied Physics Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of EducationJilin Normal UniversityChangchunChina

The flexible self-supporting electrode can maintain good mechanical and electrical properties while retaining high specific capacity,which meets the requirements of flexible ***-sulfur batteries(LSBs),as a new generation of energy storage system,hold much higher theoretical energy density than traditional batteries,and they have attracted extensive attention from both the academic and industrial *** of a proper substrate material is important for the flexible self-supporting *** materials,with the advantages of light weight,high conductivity,strong structural plasticity,and low cost,provide the electrode with a large loading space for the active material and a conductive *** makes the carbon materials meet the mechanical and electrochemical requirements of flexible *** this paper,the commonly used fabrication methods and recent research progresses of the flexible self-supporting cathode with a carbon material as the substrate are *** sulfur loading methods are summarized,which provides useful information for the structural design of the *** the first review article of the carbon-based flexible self-supporting LSB cathodes,it provides valuable guidance for the researchers working in the field of LSB.

关键词： carbon flexible lithium sulfur batteries self-supporting

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Deep potentials for materials science

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Materials Futures 2022年第2期1卷 89-115页

作者： Tongqi Wen Linfeng Zhang Han Wang Weinan E David J Srolovitz Department of Mechanical Engineering The University of Hong KongHong KongHong Kong Special Administrative Region of China DP Technology BeijingPeople’s Republic of China AI for Science Institute BeijingPeople’s Republic of China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijingPeople’s Republic of China HEDPS CAPTCollege of EngineeringPeking UniversityBeijingPeople’s Republic of China School of Mathematical Sciences Peking UniversityBeijingPeople’s Republic of China Department of Mathematics and Program in Applied and Computational Mathematics Princeton UniversityPrincetonNJUnited States of America International Digital Economy Academy(IDEA) ShenzhenPeople’s Republic of China

To fill the gap between accurate(and expensive)ab initio calculations and efficient atomistic simulations based on empirical interatomic potentials,a new class of descriptions of atomic interactions has emerged and been widely applied;*** learning potentials(MLPs).One recently developed type of MLP is the deep potential(DP)*** this review,we provide an introduction to DP methods in computational materials *** theory underlying the DP method is presented along with a step-by-step introduction to their development and *** also review materials applications of DPs in a wide range of materials *** DP Library provides a platform for the development of DPs and a database of extant *** discuss the accuracy and efficiency of DPs compared with ab initio methods and empirical potentials.

关键词： deep potential atomistic simulation machine learning potential neural network

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Using Internet to Improve Ecological as well as Energy Surveillance in Houses: A Smart Computer Integration 2

Using Internet to Improve Ecological as well as Energy Surve...

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2nd IEEE International Conference on Communication, Security and Artificial Intelligence, ICCSAI 2023

作者： Tripathi, Pankaj Kaur, Dilrajpreet Nautiyal, Hemant Thangamani Jeevananthan, P. Nalawade, Dattatraya Babanrao Invertis University Department of Electrical Engineering Uttar Pradesh Bareilly243123 India School of Basic & Applied Sciences K. R. Mangalam University Department of Physics Haryana Gurugram122103 India School of Mechanical Engineering Dev Bhoomi Uttarakhand University Uttarakhand 248007 India Karpagam Academy of Higher Education Department of Chemistry Coimbatore641021 India Karpagam College of Engineering Department of Electrical and Electronics Engineering Coimbatore641032 India Vishwakarma Institute of Information Technology Mech Engg Pune India

ISBN: (纸本)9798350369960

In regards to sharing information and ease of implementation, options for tracking and regulating digital technology in the household and educational sectors behind. It is debatable if present technology enables multi-functional data interchange. This study investigates a web-based Internet of Things (IOT) approach for heating and cooling administration and surveillance of external factors energy, and satisfaction factors in an actual home. In small to medium-sized properties, the deployed IoT system demonstrated to be adaptable with regard to information interchange, installation, and development duration, making an Internet of Things integration-based method more successful. To a larger group of recipients, this strategy creates new opportunities. The next study will likely focus on providing forecasting data analysis services as well as expanding our system to more buildings around the college campus. © 2023 IEEE.

关键词： BMS (Building Management System) Wireless sensors Customizable hardware Housing buildings IoT IoT monitoring Passive house

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