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Anticipating the lifespan: Predicting the durability of an anode-supported solid oxide fuel cell short stack over 50,000 h

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Progress in Natural Science:Materials International 2024年第3期34卷 606-613页

作者： Muhammad Zubair Khan Amjad Hussain Seung-Bok Lee Tak-Hyoung Lim Rak-Hyun Song Department of Materials Science & Engineering Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology Hydrogen Energy Research Division Korea Institute of Energy Research Department of Advanced Energy and System Engineering Korea University of Science and Technology (UST)

In the present study, the operational lifetime of a solid oxide fuel(SOFC) short stack is predicted by investigating the performance degradation of both the short stack and its cells throughout 1000 h at 800°C. The short stack and integral cell voltages are continuously measured during the long-term test, with electrochemical impedance spectroscopy(EIS) conducted every 200 h. The short stack voltage decreased rapidly for the initial 200–300 h and afterwards, it decreased at a slow rate due to the increase in the Ohmic and polarization resistances in the same manner. Scanning electron microscopy results show that there is no delamination or cracking among constituent layers of the short-stack cells. The single degradation effects of the Ni coarsening in the anode, cation migration and surface segregation in cathode and oxide scale growth in metallic interconnect mesh are successfully integrated into a comprehensive lifetime prediction model. The experimentally measured voltage degradation data of the short stack fits well with the developed mathematical model and allows the successful prediction of the lifetime up to 50,000 h.

关键词： SOFC Stack Degradation Impedance Lifetime

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Strength-ductility synergy in Mg-Gd-Y-Zr alloys via texture engineering in bi-directional forging

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Journal of Magnesium and Alloys 2024年第11期12卷 4709-4721页

作者： Jingli Li Quanfeng Han Xiuzhu Han Xin Yi Institute for Advanced Materials North China Electric Power UniversityBeijing 102206China Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China Beijing Institute of Spacecraft System Engineering Beijing 100094China

In this work,we successfully fabricate an ultra-high strength Mg-11Gd-3Y-0.5Zr alloy with ultimate tensile strength of 523 MPa and enhanced ductility via cost-effective bi-directional forging (BDF) and subsequent annealing heat *** elucidate the role of BDF and gain a fundamental understanding of the remarkable simultaneous increase of strength and ductility,systematic microstructure characterization and analysis are *** is revealed that the double-peak basal texture,with basal poles located at the center of two mutually perpendicular forging directions,serves as an essential factor for the strength-ductility synergy of the Mg-11Gd-3Y-0.5Zr alloy processed with *** of the double-peak basal texture in overcoming the strength-ductility trade-off include promoting non-basal slip,increasing ductility,and enlarging the Hall-Petch effect along the sample elongation direction while reducing the extent of anisotropy in critical resolved shear stresses of different slip *** study demonstrates that texture engineering is a powerful strategy to control magnesium alloy performance and BDF is a promising processing technique for enhancing mechanical properties of magnesium alloys.

关键词： Bi-directional forging(BDF) Magnesium alloys High strength Texture Anisotropy

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Effect of emulsification of biodiesel fuel on gas emission and thermal property

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Materials Today: Proceedings 2022年 66卷 2598-2602页

作者： Torii, Shuichi Iwanaga, Takumi Department of Advanced Mechanical System Engineering Kumamoto University Japan

The aim of the present study is to produce the stable biodiesel emulsion fuels and to disclose the effect of emulsification of biodiesel fuel on the emission and thermal property characteristics. Emphasis is placed on the conditions related to the effective of glycerin fatty acid ester as a hydrophobic emulsifier in biodiesel emulsion and the characteristics of exhaust gases and water content. Here, biodiesel fuel is obtained via transesterification of rapeseed oil with methanol and ethanol and its emulsification, i.e., stable homogeneous mixture of water and biodiesel fuel is performed with the aid of Glycerin fatty acid ester (CR-310) as surfactant. It is found that (i) nitrogen oxides (NOx), for biodiesel fuel, is reduced with the increase in engine speed, while carbon oxides CO is slightly increased, (ii) emulsion fuel stabilizes over water content between 5 and 20% for over 1 month, (iii) production of NOx for diesel and bio-diesel fuels is suppressed due to water suspension and this trend becomes larger with an increase in engine speed and (iv) in contrast, CO emission is increased with an increase in water content and the corresponding effect of engine speed is minor. © 2022

关键词： Thermodynamic properties

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Delivery Invoice Information Classification system for Joint Courier Logistics Infrastructure

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Computers, Materials & Continua 2023年第5期75卷 3027-3044页

作者： Youngmin Kim Sunwoo Hwang Jaemin Park Joouk Kim Department of Systems Engineering Ajou UniversitySuwon16499Korea Advanced Logistics System Research Department Korea Railroad Research InstituteUiwang16105Korea

With the growth of the online market,demand for logistics and courier cargo is increasing ***,in the case of urban areas,road congestion and environmental problems due to cargo vehicles are mainly *** joint courier logistics system,a plan to solve this problem,aims to establish an efficient logistics transportation system by utilizing one joint logistics delivery terminal by several logistics and delivery ***,several courier companies use different types of courier *** a system has a problem of information data transmission ***,the data processing process was systematically analyzed,a practically feasible methodology was devised,and delivery invoice information processing standards were established for *** addition,the importance of this paper can be emphasized in terms of data processing in the logistics sector,which is expected to grow rapidly in the *** results of this study can be used as basic data for the implementation of the logistics joint delivery terminal system in the *** it can be used as a basis for securing the operational reliability of the joint courier logistics system.

关键词： Joint courier logistics base infrastructure logistics cooperation urban public infrastructure YOLOv4 object detection algorithm

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Highly dense and ultrathin gadolinia-doped ceria interlayer for enhanced performance of large-area anode-supported solid oxide fuel cell

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Progress in Natural Science:Materials International 2023年第5期33卷 733-741页

作者： Sang Woo Shin Amjad Hussain Muhammad Zubair Khan Dong Woo Joh Tak-Hyung Lim Seung-Bok Lee Jong-Eun Hong Joon Hyung Shim Rak-Hyun Song Hydrogen Energy Research Division Korea Institute of Energy Research Department of Mechanical Engineering Korea University Department of Advanced Energy and System Engineering Korea University of Science and Technology(UST) Department of Materials Science & Engineering Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology

The fabrication of a highly dense and ultrathin Gd doped ceria(GDC) interlayer on a large-area, porous electrolyte-coated planar anode support using vacuum slurry coating is studied for application in solid oxide fuel cells(SOFCs). The electrolyte-coated planar anode support body is fabricated by tape casting and pre-sintering is performed at 1100, 1150, and 1200°C. The GDC interlayer is coated onto the pre-sintered electrolyte-coated anode support using a vacuum slurry coating process with different immersion times(30–60 s). A highly dense and ultrathin GDC interlayer with a thickness of 1.48 μm is produced after co-sintering at 1400°C. The 1200°C pre-sintered electrolyte-coated anode support showed a thin and highly dense GDC interlayer which is attributed to a lower shrinkage difference between the coated GDC interlayer and pre-sintered body. The electrochemical performance of a vacuum slurry-coated GDC interlayer cell is 38 % higher compared to that of the screen-printed GDC-coated cell at 700°C due to the greatly reduced Ohmic and electrode polarization resistances. The considerable improvement in the performance is attributed to the ultrahigh GDC density which has prevented the secondary phase formation between the cathode and electrolyte. This study presents the economical, scalable, and reproducible process for the fabrication of highly robust GDC interlayer for the large-area planar anode-supported SOFCs.

关键词： Solid oxide fuel cell Vacuum slurry coating GDC interlayer Sintering Performance

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Simple and effective:Superlubricity behaviour of the G-quadruplex hydrogel with high selectivity for K^(+) ions based on the ocular environment

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Friction 2024年第11期12卷 2548-2562页

作者： Hongdong WANG Jian WU Kunpeng WANG Yunjuan SU Xiacong ZHANG Yuhong LIU Jianhua ZHANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Hydrogels have been the subject of significant research in the field of friction due to their exceptional lubricating *** this study,the G-quadruplex hydrogel with high selectivity for K^(+) ions was formed by introducing a mixture of G,2-formylphenylboronic acid,and polyethylene glycol diamine into simulated artificial tears solution with high transparency,and an ultra-low coefficient of friction(COF)of about 0.004 was obtained based on the simulated ocular environment,thus achieving macroscopic *** friction pairs simulating the ocular environment,to assess the frictional performance of the G-quadruplex hydrogel as both a lubricant and a friction pair based on the simulated ocular environment,we conducted experiments considering various factors such as concentration,sliding speed,and *** these experiments,it was found that superlubricity was achieved when the G-quadruplex hydrogel was applied as lubricant or friction *** effect was attributed to the three-dimensional network structure and hydrophilicity of the hydrogel,which facilitated the formation of a highly bearing and flowing hydration layer,promoting macroscopic *** to the G-quadruplex hydrogel with low concentration,the high concentration hydrogel(75 mM)exhibited increased mechanical strength and robustness in *** with biocompatibility experiments,our synthesized G-quadruplex hydrogel has excellent biocompatibility and offers a novel approach to achieve superlubricity in ocular drug delivery.

关键词： superlubricity ocular environment G-quadruplex hydrogel bio-compatibility

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Optimizing energy efficiency in wireless sensor networks: dynamic routing with capuchin search algorithm

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Multimedia Tools and Applications 2025年第15期84卷 15453-15477页

作者： Karthikeyan, M. Manimegalai, D. Rajagopal, Karthikeyan Centre for Advanced Wireless Integrated Technology Chennai Institute of Technology Chennai India Department of Electrical and Electronics Engineering Rajalakshmi Engineering College Chennai India Centre for Nonlinear System Chennai Institute of Technology Chennai India

The Internet of Things (IoT) has significantly advanced wireless communication and machine intelligence, leading to diverse applications. However, the continuous evolution of smartphones and IoT devices presents challenges for wireless sensor networks (WSNs), impacting Quality of Service (QoS) requirements. This paper proposes a solution in the form of the Capuchin Search Optimization Routing Protocol (CSORP), a multipath protocol based on the Capuchin Search Optimization (CSO) algorithm. The aim is to address QoS limitations, including end-to-end delay, power consumption, and packet transmission delay, caused by the increasing influx of IoT devices in wireless networks. The proposed CSORP is designed for WSN-based IoT devices experiencing high traffic loads and unfair network flow. Evaluation using network simulator-3 and a comparison with existing routing protocols (AODV, DSDV, I-DSDV, and DSR) demonstrate the benefits of CSORP, including an 88% packet delivery ratio, a minimum distribution speed of 0.5 m/s, a latency of 35 ms (compared to I-DSDV's 79 ms), mobility speed of three packets per second with less packet loss (0.7), and a high routing load parameter of 92%, indicating potential energy savings. In conclusion, CSORP offers advantages such as energy efficiency, low latency, high packet delivery ratio, ample bandwidth, and reduced normalization demand, making it a promising solution for improving WSN performance and QoS metrics in IoT scenarios. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Quality of service

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Finite Element Analysis According to the Extreme Load Case of Pitch Bearing for Wind Turbine 13

Finite Element Analysis According to the Extreme Load Case o...

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13th International Conference on Control, Automation and Information Sciences, ICCAIS 2024

作者： Kim, Seung Woo Kim, Hyun Jong Bae, Jae Yeong Kang, Jong Hoon Center for Green System Industry Intelligence Institute for Advanced Engineering Yongin Korea Republic of Jungwon University Department of Convergence Engineering Yongin Korea Republic of

ISBN: (纸本)9798331542047

This study was conducted to evaluate the safety of the bearing by analyzing the extreme load applied to the pitch bearing of a large wind turbine. NREL DG03 contact stress calculation and finite element analysis were performed for the maximum extreme load and 15% and 30% increased extreme load conditions applied to pitch bearings for large wind turbines. Using the calculated and analyzed results, safety evaluation was performed based on NREL DG03 guidelines. Based on the ball bearing static allowable stress of 4200 MPa from NREL DG03 guidelines, the safety factor of the finite element analysis was calculated and found to be 2.39 for the maximum extreme load, 1.73 for the 15% up extreme load, and 1.25 for the 30% up extreme load. Based on the minimum factor of safety of 1.5 in ISO 76, the results are above the minimum factor of safety up to 15% up extreme load, so the bearing design is considered safe. © 2024 IEEE.

关键词： Wind turbines

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Efficient Removal of Acetaldehyde Using KOH-Activated Adsorbents Derived from Pyrolysis Char of Waste Cigarette Filters

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Korean Journal of Chemical engineering 2025年 1-11页

作者： Lee, Sang Eun Park, Jung Eun Cha, Jin Sun Kim, Huijeong Kim, Young-Min Center for Bio Resource Recycling Institute for Advanced Engineering Yongin17180 Korea Republic of Material Technology Center Korea Testing Laboratory Seoul08389 Korea Republic of Department of Environmental Engineering Daegu University Gyeongsan38453 Korea Republic of Department of Energy System Engineering Daegu University Gyeongsan38453 Korea Republic of

This study investigates the adsorption performance of activated carbon produced by activating cigarette filter pyrolysis char (CPC), derived from waste cigarette butts, with KOH. Pyrolysis of waste cigarette filters was conducted in a lab-scale reactor at 500 °C, producing gas, oil, and char with yields of 23.0%, 53.3%, and 23.7%, respectively. KOH activation was performed by mixing CPC with KOH at different ratios (1:1, 1:2, 1:3), followed by heating to 850 °C at a ramp rate of 5 °C/min. With increasing KOH content, the pore properties of the activated carbons improved significantly, with KOHCPC3 (CPC/KOH: 1:3) exhibiting a remarkable specific surface area of 2867 m2/g and a pore volume of 0.86 cm3/g. XPS analysis revealed the development of oxygen-containing functional groups due to KOH activation, which contributed to enhanced adsorption performance. The acetaldehyde adsorption capacity of the activated carbons increased with the KOH ratio, from 3.1 mg/g for CPC/KOH (1:1) to a maximum of 17.54 mg/g for CPC/KOH (1:3). These findings demonstrate the potential of cigarette pyrolysis char as a high-performance adsorbent for environmental and industrial applications. © The Author(s), under exclusive licence to Korean Institute of Chemical Engineers 2025.

关键词： Pyrolysis

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Analog parallel processor for broadband multifunctional integrated system based on silicon photonic platform

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Light(Science & Applications) 2025年第3期14卷 746-756页

作者： Na Qian Defu Zhou Haowen Shu Ming Zhang Xingjun Wang Daoxin Dai Xiao Deng Weiwen Zou State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(imLic)Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghaiChina State Key Laboratory of Advanced Optical Communications System and Networks Department of ElectronicsSchool of Electronics Engineering and Computer SciencePeking UniversityBejingChina State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhouChina

Sharing the hardware platform between diverse information systems to establish full cooperation among different functionalities has attracted substantial ***,broadband multifunctional integrated systems with large operating frequency ranges are challenging due to the bandwidth and computing speed restrictions of electronic ***,we report an analog parallel processor(APP)based on the silicon photonic platform that directly discretizes and parallelizes the broadband signal in the analog *** APP first discretizes the signal with the optical frequency comb and then adopts optical dynamic phase interference to reassign the analog signal into 2N parallel *** photonic analog parallelism,data rate and data volume in each sequence are simultaneously compressed,which mitigates the requirement on each parallel computing ***,the fusion of the outputs from each computing core is equivalent to directly processing broadband *** the proof-of-concept experiment,two-channel analog parallel processing of broadband radar signals and high-speed communication signals is implemented on the single photonic integrated *** bandwidth of broadband radar signal is 6 GHz and the range resolution of 2.69 cm is *** wireless communication rate of 8 Gbit/s is also *** the bandwidth and speed limitations of the single-computing core along with further exploring the multichannel potential of this architecture,we anticipate that the proposed APP will accelerate the development of powerful optoelectronic processors as critical support for applications such as satellite networks and intelligent driving.

关键词： analog parallel processor sharing hardware platform multifunctional integrated systems establish full cooperation different functionalities analog parallel processor app based silicon photonic platform electronic circuitryherewe broadband signal

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