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UPB Scientific Bulletin, Series C: Electrical engineering and Computer science 2025年第1期87卷 391-400页

作者： Dumitrescu, Claudia Rozhentsev, Andrii Brad, Sebastian Necula, Horia National Research and Development Institute for Cryogenics and Isotopic Technologies ICSI Ramnicu Valcea Romania Faculty of Energy Engineering National University of Science and Technology Politehnica Bucharest Romania

This paper examines the mathematical model of a compact double-flow poly-disk heat exchanger in order to determine the heat capacity, temperature profiles and possible optimization of developed design. The heat exchanger has a unique patented design, which ensures its remarkable compactness for specific operating conditions in a cascade of cryogenic distillation columns of hydrogen isotopes when the heat transfer coefficients of the flows might vary significantly from one another. Such situations can be observed when the gas flows participating in the heat exchange have small mass flow rates, differing from each other by several times. © 2025, Politechnica University of Bucharest. All rights reserved.

关键词： Distillation columns

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development AND EXPERIMENTAL VALIDATION OF A FULLY-ELECTRODELESS ELECTRIC PROPULSION SYSTEM FOR SATELLITE OPERATIONS IN LOW EARTH ORBIT

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UPB Scientific Bulletin, Series D: Mechanical engineering 2024年第4期86卷 75-88页

作者： Andreescu, Anna-Maria Theodora Crunteanu, Daniel Eugeniu Danescu, Simona Teodorescu, Maximilian Vlad Stoicescu, Adrian Cancescu, Alexandru Romanian Research & Development Institute for Gas Turbines COMOTI Romania National University of Science and Technology POLITEHNICA Bucharest Faculty of Aerospace Engineering Romania Romanian Space Science Institute Magurele Romania

This paper presents the design, fabrication, and experimental validation of disruptive Electric Propulsion (EP) system. The system features a compact helicon reactor integrated with a multi-dipole cusp magnetic confinement system, aligning with the emerging trends in the Low Earth Orbit (LEO) propulsion sector. This approach aims to meet the increasing demands for efficient, compact, and sustainable propulsion solutions suitable for modern satellite missions. This research aims to enhance the throttleability of a compact Helicon Plasma Thruster (HPT) by managing ion energies via transitions from Capacitive Coupled Plasma (CCP) modes to Inductive Coupled Plasma (ICP) modes. This was achieved by adjusting the RF input power while maintaining a constant magnetic field. Through the experimental testing campaign, it has been proved the jump power threshold of the CCP-ICP at 200 W for an argon flow rate of 8 standard cubic centimeter per minute (sccm) by means of Optical Emission Spectroscopy. The findings provide guidelines for further optimization of the HPT, aiming to achieve a comprehensive understanding of the argon plasma structure inside a compact magnetically enhanced inductively reactor. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Optical emission spectroscopy

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Effect of Filler to Bitumen Weight Ratio on Low-temperature Cracking Performance of Asphalt Mixture

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Jordan Journal of Civil engineering 2024年第4期18卷 608-622页

作者： Rezaei, Sajad Khabiri, Mohammad Mehdi Pezeshki, Behzad Movahed, Mojtaba Bagheri Khakbazan, Amir Hossain Department of Civil Engineering Yazd University Yazd Iran Department of Civil Engineering Science and Research Branch Islamic Azad University Iran Development and Civil Organization of Qom Municipality Qom Iran

The effect of mineral filler weight ratio on the low-temperature performance of hot asphalt mixtures with continuous gradation has been a subject of significant interest in the field of pavement engineering. This study focused on testing mastic, which is a bitumen mixture with mineral filler passing through a No. 200 sieve, using various tests, such as the bending beam rheometer test (BBR), direct tensile (DT) test, Infrared spectroscopy test (FTIR), X-ray diffraction (XRD) test, and semi-circular bending (SCB) test. Different weight ratios of mineral filler to useful bitumen ranging from 0.4 to 1.6 were investigated for PG 70-16 bitumen. According to the SHRP-A-407 standard, the weight ratio of mineral filler to useful bitumen plays a crucial role in determining the low-temperature performance of asphalt mixtures. The research findings confirm this fact, indicating that the weight ratio of mineral filler to bitumen plays a crucial role in determining the low-temperature performance of asphalt mixtures. As the filler-to-bitumen ratio increased, the stiffness of the bituminous mastic increased, leading to reduced fracture strain and decreased low-temperature cracking life. The optimal filler-to-bitumen ratio was recommended to be a maximum of 0.8 to balance performance and control low-temperature behavior. The results of this study underscore the importance of considering the rheological properties of bitumen mastic in addition to bitumen and asphalt mix when evaluating low-temperature performance. © 2024, Jordan University of science and Technology. All rights reserved.

关键词： Fourier transform infrared spectroscopy

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Experimental Thermal Model-Based SOC Estimation Algorithm for Lithium-Ion Phosphate Batteries Considering Internal Temperature

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Transactions of the Korean Institute of Electrical Engineers 2024年第12期73卷 2289-2296页

作者： Kim, Dong Hwan Ko, Jeong Soo Kim, Do Hyeon Lim, Jong-Hun Lim, Je Yeong Lee, Jaein Lee, Byoung Kuk Dept. of Electrical and Computer Engineering Sungkyunkwan University Korea Republic of Advanced Defense Science & Technology Research Institute Agency for Defense Development Korea Republic of

This paper proposes a method for estimating the State of Charge (SOC) of lithium iron phosphate (LFP) batteries based on an experimental thermal model that considers internal battery temperatures. The proposed algorithm involves selecting a thermal model and suggesting methods for extracting parameters from the chosen model. Using the proposed thermal model, the algorithm compensates for temperature differences in cold and hot environments, thereby correcting the internal temperature to estimate SOC accurately. The effectiveness of the proposed algorithm is verified by estimating the SOC of electric vehicle LFP batteries and comparing the accuracy before and after correction. Copyright © The Korean Institute of Electrical Engineers.

关键词： State of charge

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Anhydride type film-forming electrolyte additives for high-temperature LiNi0.6Co0.2Mn0.2O2//graphite pouch cells

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Progress in Natural science:Materials International 2023年第3期33卷 320-327页

作者： Anwei Zhang Chengyun Wang Weizhen Fan Jingwei Zhao Yanping Huo Xijun Xu GAC Automotive Research &Development Center Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Materials Science and Engineering South China University of Technology Research and Development Center Guangzhou Tinci Materials Technology Co. Ltd. College of Chemical Engineering and Light Industry Guangdong University of Technology

LiNi0.6Co0.2Mn0.2O2//graphite full cell, due to its high energy density as the most promising candidate for power batteries received increased attention, but the severe capacity loss under high-temperature conditions prevents their large-scale application. Here, glutaric anhydride（GA） and succinic anhydride（SA） as electrolyte additives are investigated to overcome the high-temperature problem of LiNi0.6Co0.2Mn0.2O2//graphite cells. Due to the unique film-forming features and high-temperature stability, the cells containing 0.5% GA and 0.5% SA can retain capacity retention of 91.2% and 92.4% stored at 60°C for 15 days, corresponding to a negligible capacity loss of 4.6 and 0.8 m Ah g-1after 200 cycles, respectively. In addition, the lifespans of cells under 25°C are also significantly extended by introducing GA and SA into the electrolytes. Electrochemical and spectroscopic techniques results indicate the full cell capacity loss is predominantly caused by the unstable anode solid electrolyte interphase（SEI） layer and a stable SEI film derived from GA and SA is formed on the graphite electrode *** SEI film can effectively inhibit the consumption of electrolytes and enhance the high-temperature performance of cells. This work paves a way for moderating high energy density cells' work under high-temperature operation by developing special anodic film-forming electrolyte additives.

关键词： Anhydride-based Electrolyte additives Film-forming LiNi0.6Co0.2Mn0.2O2//graphite High-temperature performance

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Investigation of system parameters towards safer impact based shock-to-detonation transition in a novel laser driven flyer plate prototype

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Defence Technology（防务技术） 2024年第9期39卷 103-113页

作者： Gonca Saglam Ozkasapoglu Selis Onel Institute of Science Hacettepe UniversityBeytepe06800Turkey TUBITAK SAGE Defense Industries Research and Development Institute Ankara06261Turkey Department of Chemical Engineering Hacettepe UniversityBeytepe06800AnkaraTurkey

Laser driven flyer plate technology offers improved safety and reliability for detonation of explosives in industrial applications ranging from mining and stone quarrying to the aerospace and defense *** study is based on developing a safer laser driven flyer plate prototype comprised of a laser initiator and a flyer plate subsystem that can be used with secondary *** parameters were optimized to initiate the shock-to-detonation transition(SDT)of a secondary explosive based on the impact created by the flyer plate on the explosive *** of the flyer was investigated at the mechanically weakened region located on the interface of these subsystems,where the product gases from the deflagration of the explosive provide the required energy.A bilayer energetic material was used,where the first layer consisted of a pyrotechnic component,zirconium potassium perchlorate(ZPP),for sustaining the ignition by the laser beam and the second layer consisted of an insensitive explosive,cyclotetramethylene-tetranitramine(HMX),for deflagration.A plexiglass interface was used to enfold the energetic *** focal length of the laser beam from the diode was optimized to provide a homogeneous beam profile with maximum power at the surface of the *** bomb experiments were conducted in an internal volume of 10 cm^(3) for evaluation of *** of the laser driven flyer plate system output on confinement,explosive density,and laser beam power were *** using a high-speed camera resulted in a flyer velocity of 670±20 m/s that renders the prototype suitable as a laser detonator in applications,where controlled employment of explosives is critical.

关键词： Laser driven flyer plate Shock to detonation transition Detonation Secondary explosives Pyrotechnic materials Confinement

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A review of welding simulation methods for large components

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Progress in Natural science:Materials International 2023年第5期33卷 551-568页

作者： Shuai Liu Zhiqiang Wu Wenhao Zhou Honggang Zhou Keke Zhang Danqing Yin Yongping Lei Yongfeng Qiu Engineering Research Center of Mining Development Technology and Equipment for Deep Sea and Earth Ministry of Education Hunan University of Science and Technology Hunan Valin Xiangtan Iron & Steel Group Co. Ltd Research Institute of Technology Jianglu Electromechanical Science & Technology Co. Ltd.Xiangtan School of Materials Science and Engineering Henan University of Science and Technology School of Materials Science and Engineering Beijing University of Technology Guiyang Aluminum Magnesium Design & Research Institute Co. Ltd

The challenges posed by cross-scale effects, large computational requirements, high nonlinearity, and complex interactions of multiple physical phenomena constitute major obstacles to the effectiveness and accuracy of welding simulations for large structural components. Therefore, achieving accurate welding simulation to predict and effectively control welding deformation of substantial engineering structural parts is essential to ensure welding quality and improve production efficiency. This paper reviews the current research status of welding numerical simulation of large engineering components, including the establishment of the finite element model,optimization of the heat source model, selection of appropriate finite element calculation method, and the control of welding deformation through optimization algorithm. In addition, the strategies to improve the precision and efficiency of welding numerical simulation and control welding deformation of engineering components are analyzed and discussed. The future development of welding numerical simulation will focus on balancing simulation accuracy and simulation efficiency and optimizing welding parameters to control welding deformation efficiently.

关键词： Large welded components Algorithm optimization Welding deformation Simulation accuracy and efficiency

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Low‑Carbon‑Emission Hot Stamping:A Review from the Perspectives of Steel Grade,Heating Process,and Part Design

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Automotive Innovation 2023年第3期6卷 324-339页

作者： Zeran Hou Yi Liu Qi He Jianfeng Wang Junying Min School of Mechanical Engineering Tongji UniversityShanghai 201804China China Science Lab General Motors Global Research and DevelopmentShanghai 201206China

Hot stamping steels have become a crucial strategy for achieving lightweighting and enhancing crash safety in the automo-tive industry over the past two ***,the carbon emissions of the materials and their related stamping processes have been frequently *** is essential to consider these emissions during the design *** materials and technologies in hot stamping pose challenges to the automotive industry's future development in carbon emission *** review discusses the promising materials for future application and their special features,as well as the emerging manufacturing and part design processes that have extended the limit of application for new *** heating processes and corresponding equipment have been proven to improve heating efficiency and control temperature *** material utilization and the overall performance of the components are improved by tailored blanks and an integrated part design *** achieve low-carbon-emission(LCE)hot stamping,it is necessary to systematically consider the steel grade,heating process,and part design,rather than solely focusing on reducing carbon emissions during the manufacturing process *** review aims to present the latest progress in steel grade,heating process,and part design of hot stamping in the automotive industry,providing solutions for LCE from a holistic perspective.

关键词： Low-carbon-emission Hot stamping Steel grade Heating process Part design

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An Enhanced Equilibrium Optimizer for Solving Optimization Tasks

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Computers, Materials & Continua 2023年第11期77卷 2385-2406页

作者： Yuting Liu Hongwei Ding Zongshan Wang Gaurav Dhiman Zhijun Yang Peng Hu School of Information Science and Engineering Yunnan UniversityKunming650500China Department of Electrical and Computer Engineering Lebanese American UniversityByblos1401Lebanon University Centre for Research and Development Department of Computer Science and EngineeringChandigarh UniversityGharuanMohali140413India Department of Computer Science and Engineering Graphic Era(Deemed to be University)Dehradun248002India Research and Development Department Youbei Technology Co.Ltd.Kunming650500China

The equilibrium optimizer(EO)represents a new,physics-inspired metaheuristic optimization approach that draws inspiration from the principles governing the control of volume-based mixing to achieve dynamic mass *** its innovative foundation,the EO exhibits certain limitations,including imbalances between exploration and exploitation,the tendency to local optima,and the susceptibility to loss of population *** alleviate these drawbacks,this paper introduces an improved EO that adopts three strategies:adaptive inertia weight,Cauchy mutation,and adaptive sine cosine mechanism,called ***,a new update formula is conceived by incorporating an adaptive inertia weight to reach an appropriate balance between exploration and ***,an adaptive sine cosine mechanism is embedded to boost the global exploratory ***,the Cauchy mutation is utilized to prevent the loss of population diversity during *** validate the efficacy of the proposed SCEO,a comprehensive evaluation is conducted on 15 classical benchmark functions and the CEC2017 test *** outcomes are subsequently benchmarked against both the conventional EO,its variants,and other cutting-edge metaheuristic *** comparisons reveal that the SCEO method provides significantly superior results against the standard EO and other *** addition,the developed SCEO is implemented to deal with a mobile robot path planning(MRPP)task,and compared to some classical metaheuristic *** analysis results demonstrate that the SCEO approach provides the best performance and is a prospective tool for MRPP.

关键词： Metaheuristic algorithms equilibrium optimizer Cauchy mutation robot path planning

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Piezoelectric-enhanced BiOBr/UiO-66-NH_(2)(Hf)photocatalysts for purification of mixed pollutants

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science China(Technological sciences) 2025年第5期68卷 87-101页

作者： Tingting YU Chenyu YANG Ran DENG Yonghang ZHANG Jiajun LI Tao YANG Jizhou JIANG School of Environmental and Chemical Engineering Jiangsu Ocean UniversityLianyungang 222005China School of Materials Science and Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China

The simultaneous purification of multiple mixed pollutants holds significant practical value in addressing the growing environmental challenges of *** this work,UiO-66-NH_(2)(Hf)octahedrons were successfully synthesized and grown on BiOBr nanosheets to form a novel heterojunction,BiOBr/UiO-66-NH_(2)(Hf).This BiOBr/UiO-66-NH_(2)(Hf)heterojunction exhibits enhanced photocatalytic degradation and reduction ***,the degradation rate of tetracycline hydrochloride(TC)reached 84.8%,while the reduction efficiency of Cr(VI)approached 100%,demonstrating the material’s effectiveness in simultaneously purifying mixed ***,when ultrasonic force was applied,the degradation rate of TC increased from 57.1%to 84.8%,and the reduction rate of Cr(VI)improved from 73.5%to 100%.These results highlight the material’s excellent piezoelectric properties,which were confirmed through density functional theory calculations and piezoresponse force *** work introduces a novel piezoelectric-coupled photocatalyst that offers a new strategy for the efficient purification of mixed ***,it demonstrates that TC can promote the reduction of Cr(VI)in place of hole quenchers,while simultaneously undergoing *** approach reveals promising prospects for the effective removal of mixed pollutants.

关键词： piezoelectric effect tetracycline hydrochloride photocatalytic degradation Cr(VI)reduction mixed pollutant purification

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