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SSrN 2023年

作者： Lindvall, rebecka diaz, Kevin Monroe Peng, ru Lin Gutnichenko, Oleksandr Sirén, Sebastian Åberg, Lena Magnusson Norgren, Susanne M’Saoubi, rachid Bushlya, Volodymyr Ståhl, Jan-Eric Division of Production and Materials Engineering Department of Mechanical Engineering Sciences LTH Lund University Ole Römers väg 1 Lund221 00 Sweden Division of Engineering Materials Department of Management and Engineering Linköping University Linköping581 83 Sweden Material Technology Processes and Specialists Volvo Group Trucks Operations BE63934 Skövde541 87 Sweden Sandvik Coromant R&D Lerkrogsvägen 13 Stockholm126 80 Sweden R&D Materials and Technology Development Seco Tools AB Björnbacksvägen 10 Fagersta737 82 Sweden

By replacing conventional gray cast iron (GI) with compacted graphite iron (CGI), automotive industry could keep up with stricter regulations on emissions and demands on higher engine performance. CGI has improved properties as to GI but is more difficult to machine. This study evaluates the machining performance at sustainable machining during finish face milling when using minimum quantity lubrication applied vegetable oil with and without graphite nano-additive, resulting in 8% or 17–23% improved tool life respectively as to dry conditions. The major part of the study investigates the wear mechanisms in commercial Ti(C,N)-Al2O3 CVd-coated cemented carbide. The coating degrades by mechanically induced cracking and fractures, oxidation of adhered CGI inside cracks, diffusional dissolution of Ti(C,N) layer, and reaction of Al2O3 layer with MgO inclusions forming a softer (Mg,Fe,Mn)Al2O4 spinel which is easier removed by the superficial plastic deformation due to chip flow. Other oxide inclusions, when deposited on cemented carbide surfaces, prevents adhesion of CGI material and thus reduces the wear rate. CGI adhering to cemented carbide induces diffusional loss of cobalt and carbon that eventually forms (Fex,Co1-x)3C iron carbide at the tool-workpiece interface which can reduce the diffusion rate. Novel findings also relates to the formation of 15 µm deep cracks in the cemented carbide due to inward diffusion of Fe accompanied by its oxidation that speeds up the oxygen ingress and further oxidation of W and Co. However, oxidation was found to provide a positive effect when the adhered CGI completely oxidized to form Fe2SiO4 oxide ceramic Tool Protection Layer which slowed down tool material degradation. © 2023, The Authors. All rights reserved.

关键词： Wear of materials

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Continuous Facilitated Transport Pathway Constructed by In-Situ Interlinkage of Mobile Aniline with Fixed Carriers distributing Along Nanofibers for Carbon Capture

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SSrN 2023年

作者： Zheng, Wenji Jian, Xiangjun Shi, Zhengwen Li, Ziheng ruan, Xuehua Jiang, Xiaobin Wang, Hanli Yang, Zhendong Li, Xiangcun dai, Yan He, Gaohong State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology School of Chemical Engineering Dalian University of Technology Liaoning Dalian116023 China Panjin Institute of Industrial Technology Dalian University of Technology Liaoning Panjin124221 China Shandong Huaxia Shenzhou New Material Co. Ltd. Zibo256401 China

Facilitated transport membrane with fixed and mobile carriers is essential yet challenging to improve the CO2 capture. Herein, a facilitated transport membrane with continuous pathway was constructed by the in-situ interlinkage of mobile aniline with the fixed carriers distributing along electrospun polyacrylonitrile nanofibers (HPAN). In this membrane, fixed amine carriers are introduced through the alkalinous hydrolysis of PAN fibers, and are distributed along the HPAN fibers to construct a long-range continuous transport pathway for CO2. The mobile aniline carriers are introduced into the interfibrous voids of the HPAN nanofibers mat (NFM) by in-situ polymerization of PEGdA, which interlink the fixed amine carriers to achieve the facilitated transport pathway continuous completely. And the fixed amine and mobile aniline carriers are demonstrated co-existing in the An/PEO@HPAN membrane (NFCM) by the FTIr and XPS results. Meanwhile, the Xrd and dSC results indicate that the introduction of aniline increases the free volume of PEO matrix, which is beneficial for enhancing CO2 permeation. Therefore, the 10 wt.% An/PEO@HPAN-3h NFCM present 90.81% and 13.15% increases in CO2 permeability and CO2/N2 selectivity under mixed gas at 0.3 MPa in contrast with the membrane without mobile aniline carriers. Under mixed gas conditions, this NFCM exhibits CO2 permeability of 202.93 Barrer and CO2/N2 selectivity of 83.89 at 0.1 MPa, reaching the 2019 Mckeown upper bound. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Correlation Model for Size Measurement of Nanoparticles by Inductively Coupled Plasma-Mass Spectrometry

Correlation Model for Size Measurement of Nanoparticles by I...

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IEEE Conference on Nanotechnology

作者： Jimin Shim Y. H. Park Yong-Hyeon Yim S. M. Jang H. B. Lim Dept. of Chem. Dankook University Cheonan Korea Dept. of Chem. Dankook University Korea Standard Material Team of Inorganic Analysis KRISS Daejon Korea R&D Lab. RAM technology Younginsi Gyunggi-do Korea

A data treatment model for fast and reliable particle size measurement by single particle ICP-MS was developed in this work. The proposed approach is based on the correlation between the known size of nanoparticle vs. the peak area obtained by time-resolved analysis. The designed model showed sufficient reliability and speed for industrial applications depending upon the credibility of correlation curve and the accuracy of particle size. For this, a window method was designed, where the data range is selected to identify ideal peaks in time-resolved spectrum and the average peak area of the particles is estimated from parameter, σ, of its Gauss fitting of the relationship. The regression coefficient (r2) of the correlation curve for commercial Au nanoparticles of <0.999 was obtained in 5 repeated measurements. The method was confirmed using NIST Au standard nanoparticles and the results showed excellent correlation with a r2 of 0.9998. The size of unknown particles determined using the proposed method matched well with that determined using TEM: the values matched within ±12% and the relative expanded uncertainty was 26% for 10 repeated measurements. Furthermore, the developed method was applied to iron oxide (Fe2O3) nanoparticles used in semiconductor manufacturing and the result showed a correlation coefficient of >0.998 as the background subtraction level was adjusted to the mean of blank signal plus 3σ (standard deviation). Overall, the developed method successfully demonstrated great potential for the determination of the size of nanoparticle with high accuracy and speed, especially for on-line monitoring of various chemicals used in the manufacturing of semiconductors.

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The First WArA robotics Mobile Manipulation Challenge - Lessons Learned

arXiv

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arXiv 2025年

作者： domínguez, david Cáceres Iannotta, Marco Kashyap, Abhishek Sun, Shuo Yang, Yuxuan Cella, Christian Colombo, Matteo Pelosi, Martina Preziosa, Giuseppe F. Tafuro, Alessandra Zappa, Isacco Busch, Finn dong, Yifei Longhini, Alberta Lu, Haofei Cabral Muchacho, rafael I. Styrud, Jonathan Fregnan, Sebastiano Guberina, Marko Jia, Zheng Carriero, Graziano Lindqvist, Sofia di Castro, Silvio Iovino, Matteo Örebro University Örebro Sweden Politecnico di Milano Dipartimento di Elettronica Informazione e Bioingegneria Milano Italy Stockholm Sweden Lund Sweden University of Basilicata Italy Pharmaceutical Technology & Development R&D AstraZeneca Gothenburg Sweden ABB Corporate Research Västerås Sweden

The first WArA robotics Mobile Manipulation Challenge, held in december 2024 at ABB Corporate research in Västerås, Sweden, addressed the automation of task-intensive and repetitive manual labor in laboratory environments — specifically the transport and cleaning of glassware. designed in collaboration with AstraZeneca, the challenge invited academic teams to develop autonomous robotic systems capable of navigating human-populated lab spaces and performing complex manipulation tasks, such as loading items into industrial dishwashers. This paper presents an overview of the challenge setup, its industrial motivation, and the four distinct approaches proposed by the participating teams. We summarize lessons learned from this edition and propose improvements in design to enable a more effective second iteration to take place in 2025. The initiative bridges an important gap in effective academia-industry collaboration within the domain of autonomous mobile manipulation systems by promoting the development and deployment of applied robotic solutions in real-world laboratory contexts. Copyright © 2025, The Authors. All rights reserved.

关键词： Industrial robots

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Experimental Investigation on Heat Transfer Enhancement of Electric Vehicle Battery with Zig-Zag Plate and Copper Cooling Pipe

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SSrN 2022年

作者： Angani, Amarnathvarma Kim, Hyeon-Woo Hwan, Hwang Myeong Eugene, Kim Kyoung-Min, Kim Cha, Hyun rok Automotive Material & Component R&D Group Korea Institute of Industrial Technology 6 7 Cheomdangwagi-ro 208beon-gil Buk-gu Gwangju61012 Korea Republic of

An experimental investigation is performed on the advanced battery thermal management system for the lithium-ion battery of electric vehicles. The performance and safety of electric vehicles rely on batteries. In addition, a proper thermal management system is required to ensure safety and to achieve the required performance. In this study we propose two models to improve thermal management by dissipating more heat from each individual cell in pack, with the combination of a specially designed Zig-Zag plate and copper pipe liquid cooling system. In the first method, the coolant is circulated at the base plate, and in the second method, the coolant is circulated at the dual sides of the battery pack. The liquid coolant is indirect contact with the battery and acts as a medium to remove the heat generated from the battery during charge and discharge conditions. Experiments were conducted on 1kW battery pack at discharge rates of 1C and 1.25C. Thermal performance with heat flow analysis of each design was studied and compared among two structures. From the result, the best cooling performance is obtained by the second method, where the maximum temperature of the battery is recorded as 30.4 at 1.25C discharge and thermal performance is improved by 29.4%. Therefore, the present approach in this paper can optimize the battery thermal management system for electric vehicles. © 2022, The Authors. All rights reserved.

关键词： Coolants

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An Integrated Simulation Model Towards Lpbf in Situ Alloying technology

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SSrN 2022年

作者： Hou, Yaqing Su, Hang Zhang, Hao Li, Fafa Wang, Xuandong He, dupeng He, Yazhou Material Digital R&D Center China Iron & Steel Research Institute Group Beijing100081 China Hangzhou Dedibot Intelligent Technology Co. Ltd Hangzhou310000 China

The Laser Powder Bed Fusion (LPBF) in-situ alloying is a novel technology for preparing complex structural parts. However, the narrow process window of the LPBF in-situ alloying limit its application. A micro-scale integrated simulation model is designed and constructed based on the discrete Element Method(dEM), the Finite Element Method(FEM), and Calculation of Phase diagram (CALPHAd) method in the work. The equation of the calculation methods are introduced. By defining the parameters such as composition inhomogeneity ω, the forming performance of LPBF in-situ alloying FeCoCrNi medium entropy alloys are predicted. The calculation results show that the hysteresis diffusion effect makes the mixing powders more challenging to be in -situ alloyed than conventional main component alloys. For the mixed powder beds consisting of 15-53 μm particles with equal mass ratio, the composition deviation on the micro-scale is within 2.5%, and the composition homogeneity reaches 98.9 %. Under a laser power of 150 W and a scanning speed of 500 mm/s, several laser remelting process are indispensable to eliminate unmelted elements. Experiments are carried out to verify the accuracy of the integrated simulation model. The model paves a new avenue for studying and optimizing laser-based in-situ alloying techniques. © 2022, The Authors. All rights reserved.

关键词： Entropy

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A New dual-Input Single-Output Step-up dC-dC Converter for Grid-Connected Photovoltaic Applications

A New Dual-Input Single-Output Step-up DC-DC Converter for G...

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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Priyabrata Shaw Muhammad Mubashir Alam Saad Ul Hasan Yam P. Siwakoti dylan dah-Chuan Lu Department of Electronics & Control Research and Development (R&D) Shakti Pumps (India) Ltd. India School of Electrical & Data Engineering University of Technology Sydney Australia

This paper proposes a dual-input single-output (dISO) step-up dc-dc converter exhibiting high voltage gain for grid-connected applications. The main advantage of the proposed concept is the common ground between input and output ports with a continuous input current profile at both input ports. The operating principle and steady-state analysis are presented in detail. The voltage gain expressions for both inputs are obtained using equivalent circuit analysis. The voltage and current stresses of all components and the design equations for L-C elements are derived. Preliminary simulation results are presented using the LTspice simulator to demonstrate the key operational characteristics of the proposed dISO step-up converter. Finally, the converter operation and analytical studies are verified through sample experimental results captured using a prototype converter.

关键词： Photovoltaic systems Simulation Mathematical analysis Voltage dC-dC power converters High-voltage techniques Topology

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Classification of ISAr Images Generated from Model-based Approaches Using deep Learning

Classification of ISAR Images Generated from Model-based App...

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International Conference on Information Networking

作者： Soyoon Park Seonmin Cho Seongwook Lee Taewon Jeong Youngjae Choi Seungeui Lee Youngseok Bae School of Electrical and Electronics Engineering College of ICT Engineering Chung-Ang University Seoul Republic of Korea Institute of Radio Frequency Engineering and Electronics Karlsruhe Institute of Technology Karlsruhe Germany Advanced R&D Center Hanwha Systems Gyeonggi-do Republic of Korea Emerging Science and Technology Directorate Agency for Defense Development Daejeon Republic of Korea

ISBN: (数字)9798331506940

ISBN: (纸本)9798331506957

The classification of small, low-observable airborne targets, such as drones and birds, poses significant challenges due to their low detection rates. Conventional vision sensorbased approaches often suffer from reduced performance in low-visibility environments or adverse weather conditions. Additionally, the integration of infrared sensors alongside camera sensors increases hardware complexity and cost, rendering such solutions inefficient. To address these limitations, we propose a method that leverages deep learning and inverse synthetic aperture radar (ISAr) imaging for accurate target classification, using only radar sensors. Our proposed deep learning-based ISAr image classifier comprises two key components: simulated ISAr image generation and deep learning-based classification. We construct simulated ISAr datasets using point scatter (PS) modeling for quadcopter drones, hexacopter drones, and aircraft, and three-dimension (3d) mesh modeling for birds, unmanned aerial vehicles, and quadcopter drones. The two datasets based on PS and 3d mesh modeling are used to train a proposed deep learning classifier. The proposed classifier can achieve a classification accuracy of $\mathbf{9 8 \%}$ on the PS-based dataset and $\mathbf{9 6 \%}$ on the 3d mesh-based dataset, where scattering was calculated using the physical optics method.

关键词： deep learning Solid modeling Three-dimensional displays Accuracy Atmospheric modeling Physical optics radar imaging Inverse synthetic aperture radar drones Quadrotors

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Copper hydroxide/basic copper salt derived Cu0 with a clear grain boundary for selective electrocatalytic CO2 reduction to produce multicarbon products

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Journal of materials Chemistry A 2023年第48期11卷 26481-26487页

作者： Shuchang Song Haoyang Wu Benqiang Tian Ying Zhang Yun Kuang Xiaoming Sun State Key Laboratory of Chemical Resource Engineering College of Chemistry Beijing University of Chemical Technology Beijing 100029 P. R. China Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University Wuxi 214122 China Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University Shenzhen 518057 P. R. China

Electrocatalytic CO2 reduction (ECr) is one of the most promising ways to mitigate CO2 and fuel production, and multicarbon products (C2+) with high chemical value attract lots of interest. Cu is a unique electrocatal...

Electrocatalytic CO₂ reduction (ECr) is one of the most promising ways to mitigate CO₂ and fuel production, and multicarbon products (C₂₊) with high chemical value attract lots of interest. Cu is a unique electrocatalyst that can convert CO₂ to multicarbon products, but with limited selectivity and activity. Here, aiming for a clear Cu⁰ nanoparticle structure with a clear grain boundary, we report a simple and effective method of Cu(OH)₂/basic copper sulphate compound material synthesis, which is in situ reduced to Cu⁰ nanoparticles with a clear grain boundary (GB) during the ECr process. The Cu(OH)₂/basic copper sulphate-derived Cu nanoparticles show a high C₂₊ faradaic efficiency (FE) of 81% at −1.2 V vs. rHE, which surpasses that of state-of-the-art Cu-based catalysts evaluated in an H-type cell. Extending the method to other basic copper salts (BCS), we successfully synthesized three other Cu(OH)₂/BCS species (nitrate, carbonate and chloride), which were also converted to Cu⁰ with a clear grain boundary during ECr. dFT calculation results reveal that the GB sites could effectively decrease the energy barrier of the reactant CO₂ adsorption and critical C–C coupling steps, which endows the derived Cu electrocatalyst with high selectivity for C₂H₄ and C₂₊ products.

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degradation Behavior of Chromium-Coated Zirconium Cladding Under High-Temperature Oxidation According to the Coating Microstructure

SSRN

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SSrN 2024年

作者： Jung, Tae-Sik Jang, Hoon Cho, Yong Ki Jang, dongchan Materials Development Section Nuclear Fuel Technology Department KEPCO Nuclear Fuel Daejeon34057 Korea Republic of Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Customized Manufacturing R&D Department Korea Institute of Industrial Technology Seohaean-ro Gyeonggi-do Siheung-si113-58 Korea Republic of

In 2011, the Great East Japan Earthquake and tsunami caused a hydrogen explosion at the Fukushima daiichi nuclear power plant, which exposed radioactive materials to the atmosphere and had a very negative impact on the nuclear power industry. Since then, efforts have intensified around the world to make nuclear power safer. Accident-tolerant fuel (ATF) is being developed to prevent the rapid oxidation of zirconium cladding, which directly causes hydrogen explosions. ATF research can be divided into two main approaches: changing the cladding material, or coating the surface of the cladding. Coatings are easier to commercialize and apply to existing nuclear power plants, so most vendors have focused on this approach. Chromium is a popular coating medium because of its superior properties such as a low oxidation rate and excellent adhesion. Therefore, research has been focused on suppressing the rapid oxidation of zirconium cladding in the event of an accident by adding a chromium coating with an appropriate thickness in terms of both economy and effectiveness. Even if the thickness of the coating is fixed, the penetration of oxidizing substances can be further delayed by improving the microstructure of the chromium coating, such as by reducing the grain boundary area. In this study, chromium-coated zirconium cladding tubes were fabricated by the arc ion plating process. The microstructure of the chromium coating was adjusted by varying the negative voltage (0–125 V), which in turn controlled the velocity at which the chromium ionic particles hit the surface of the cladding tube. Experiments were then performed in a high-temperature steam environment to determine the optimal microstructure for high-temperature oxidation resistance. The development of various material degradation phenomena that occurred during high-temperature oxidation was observed to identify the oxidation mechanism and the main factors of the microstructure that affect the zirconium oxidation rate. ©

关键词： Thermooxidation

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