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RSC Applied Interfaces 2024年第5期1卷 958-976页

作者： Sarkar, Kuntal Amerjit, None Raj, Rishi Rout, Tapan Kumar Bose, Suryasarathi Research and Development Division Tata Steel Jamshedpur 831007 India Department of Materials Engineering Indian Institute of Science Bangalore 560012 India

Galvannealed steels are mainly surface treated via chromating and phosphating processes to make their surface more corrosion-resistant and enhance paint adhesion. However, environmental regulations have put a control on the usage of these pretreatments, and these need to be replaced by environment-friendly pretreatment chemicals having similar range of properties. In this regard, a unique polyetherimide-based coating system is proposed herein containing a di-anhydride molecule and two di-amine molecules, which can avoid harsh chromating, phosphating and silane-based pre-treatments and offers properties that are not achieved using conventional routes. CNTs are added to a base pre-polymer (polyamic acid) to offer a tortuous path, whereas polyaniline-coated ceria (PANI@CeO₂) is added, prior to imidization, to offer a protective oxide layer, which worked in tandem to offer a corrosion-resistant coating. The base coating shows the lowest corrosion resistance owing to the higher porosity, presence of microcracks and a combination of both the nanoparticles offering higher noble open circuit potentials (OCPs) at all immersion times, indicating prolonged coating stability and less tendency to corrosion. In addition, electrochemical impedance spectroscopy (EIS) study of both CNT and PANI@CeO₂ reinforced composite coating shows the highest corrosion resistance and low water uptake with respect to other coating systems evaluated here. The highest corrosion resistance in the composite coatings may be due to the low coating porosity, absence of microcracks, tortuous pathways for corrosive ion movement and ennobling effect due to the presence of PANI@CeO₂ and CNTs. © 2024 RSC.

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Digital Twin of Cyber-Physical CNC for Smart Manufacturing 3

Digital Twin of Cyber-Physical CNC for Smart Manufacturing

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3rd IEEE International Conference on Digital Twins and Parallel Intelligence, DTPI 2023

作者： Williams, Bethanie Ciocarlie, Gabriela Saleeby, Kyle Ismail, Muhammad Mulkey, Clifton Tennessee Technological University Department of Computer Science Tennessee United States Research Development and Engineering TX United States Sandia National Laboratories Research and Development of Science and Engineering New Mexico United States

ISBN: (纸本)9798350318470

Due to the complexity of smart manufacturing systems, digital twins (DTs) can help manufacturers test and validate products as well as determine any process failures before production. Computer numerical control (CNC) machines are widely used and employed in several manufacturing industries because of their precision and efficiency. Despite the wide adoption of CNC machines, there is currently no CNC-based DT that simulates an entire production process. This paper demonstrates the implementation and validation of a DT that can 1) replicate the physical manufacturing operations of products on Tormach CNC machines by accurately generating the positional values of the machine's tool path along the X, Y, and Z axes, 2) employ MTConnect's communication protocol by utilizing an adapter and an agent that produces data such as timestamps, axis positions, and spindle speed into MTConnect's standardized XML format, 3) deploy an MTConnect utility, dataminer, to collect data from the agent and properly store it into a JSON format for further analysis. For validation purposes, an example coin geometry was simulated on the DT and manufactured in aluminum on a real Tormach machine. A comparison between the simulated operations and real system was made to validate the accuracy of the DT. Dynamic time warping (DTW) was used to compare process data from the DT with data from the real machine. Our analysis shows that the DT and real system have a high correlation as the DTW warping path is closely aligned at a 45 degree angle line and has minimal time warping. © 2023 IEEE.

关键词： Industry 4.0

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Understanding the hydrocarbon-generation potential on jurassic coal-measure source rocks in the Junggar Basin: From the perspective of hydrogen-rich molecular structure

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Petroleum science 2024年第5期21卷 2969-2983页

作者： Tian-Chen Ge Xiang-Chun Chang Guan-Long Zhang Jun-Jian Zhang Rui-Chao Guo Wei-Zheng Gao Ling-Yu Zhao Shang-Bin Wang Jia-Qi Duan College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao266590ShandongChina Laboratory for Marine Mineral Resources Qingdao Marine Science and Technology CenterQingdao266237ShandongChina Research Institute of Petroleum Exploration and Development Shengli Oil CompanySinopecDongying257001ShandongChina School of Geology and Mining Engineering Xinjiang UniversityUrumqi830017XinjiangChina

The Jurassic coal-measure source rocks in the Junggar Basin have drawn considerable attention in recent years. In our hydrocarbon thermal simulation experiments of these rocks, we found that the dark mudstone evaluated as good source rock, had a much lower hydrocarbon generation capacity than the coal and carbonaceous mudstone, evaluated as poor source rock. Based on this background, we performed Fourier transform infrared spectroscopy(FTIR) and combined the results of semi-open thermal simulation experiments to explore the association between the molecular structure and hydrocarbon production capacity, with the aim of obtaining a new understanding of hydrocarbon potential of Jurassic coal-measure source rocks from the perspective of molecular structure. The results indicate that coals exhibit lower condensation of aromatic structures and higher relative abundance of aliphatic structures with a higher degree of branched chaining than mudstones and carbonaceous mudstones. Apparent aromaticity(f_a), aromatic abundance parameter I, and degree of condensation(DOC) are negatively correlated with organic matter abundance. The aliphatic structural parameter H demonstrates a substantial positive correlation with organic matter abundance. Furthermore, aliphatic relative abundance factor A is associated with the type of organic matter;the better is the type of the organic matter, the larger is the A value. The combination of the molecular structures with the thermal simulation results shows that the aliphatic hydrogen enrichment of selected carbonaceous mudstone is similar to that of coal. However, the relative abundance of the aliphatic group of it is high, and the DOC of the aromatic structure is low, making the hydrocarbon generation base stronger and easier to crack. Thus, the hydrocarbon generation capacity of carbonaceous mudstone is slightly higher than that of coal. Mudstone has low H and I values, and the DOC is high, indicating that its hydrocarbon base is low, so i

关键词： Coal-measure source rock Hydrocarbon potential Macromolecular structure Semi-open system pyrolysis Junggar basin

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UKF‐MOT:An unscented Kalman filter‐based 3D multi‐object tracker

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CAAI Transactions on Intelligence Technology 2024年第4期9卷 1031-1041页

作者： Meng Liu Jianwei Niu Yu Liu Collective Intelligence&Collaboration Laboratory China North Artificial Intelligence and Innovation Research InstituteBeijingChina China North Vehicle Research Institute BeijingChina State Key Laboratory of Software Development Environment School of Computer Science and EngineeringBeihang UniversityBeijingChina State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijingChina School of Computer Science and Engineering Beihang UniversityBeijingChina

Multi‐object tracking in autonomous driving is a non‐linear *** better address the tracking problem,this paper leveraged an unscented Kalman filter to predict the object's *** the association stage,the Mahalanobis distance was employed as an affinity metric,and a Non‐minimum Suppression method was designed for *** the detections fed into the tracker and continuous‘predicting‐matching’steps,the states of each object at different time steps were described as their own continuous *** conducted extensive experiments to evaluate tracking accuracy on three challenging datasets(KITTI,nuScenes and Waymo).The experimental results demon-strated that our method effectively achieved multi‐object tracking with satisfactory ac-curacy and real‐time efficiency.

关键词： autonomous vehicle transportation

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Recent advancements in butyric acid research: Health effects， sources， and high-efficiency bioconversion production strategies

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Food science and Human Wellness 2024年

作者： Zhipeng Zhou Xinyu Wang Yujie Zhong Shengbao Cai Zhijia Liu Yanfei Wang Xiaosong Hu Tao Wang Junjie Yi Faculty of Food Science and Engineering， Kunming University of Science and Technology Yunnan Engineering Research Center for Fruit & Vegetable Products International Green Food Processing Research and Development Center of Kunming City College of Food Science and Nutritional Engineering， China Agricultural University

Butyric acid， a representative short-chain fatty acid (SCFA)， has gained considerable attention due to its noteworthy health benefits and widespread application. Nonetheless， the majority of commercially available butyric acid is currently synthesized through environmentally harmful chemical synthesis methods， which pose a significant obstacle to the development of the butyric acid industry. Therefore， there is a need to develop cost-effective， efficient， and environmentally friendly methods for butyric acid production. This review commences with a systematic evaluation of the health effects and mechanisms of action of butyric acid. Subsequently， it outlines the advantages and disadvantages of different sources of butyric acid， including chemical synthesis and biosynthesis， along with their development trends. Finally， the review delves into high-efficiency strategies to enhance butyric acid production through targeted biosynthesis. This review not only serves as a valuable reference for researchers and practitioners interested in the diverse aspects of butyric acid but also offers insights into future trends in the development of butyric acid.

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Impact of dissolution and precipitation on pore structure in CO_(2)sequestration within tight sandstone reservoirs

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Petroleum science 2025年第2期22卷 868-883页

作者： Hui Gao Kai-Qing Luo Chen Wang Teng Li Zhi-Lin Cheng Liang-Bin Dou Kai Zhao Nan Zhang Yue-Liang Liu School of Petroleum Engineering Xi'an Shiyou UniversityXi'an710065ShaanxiChina Engineering Research Center of Development and Management for Low to Ultra-Low Permeability Oil&Gas Reservoirs in West China Ministry of EducationXi'an710065ShaanxiChina Xi'an Key Laboratory of Tight Oil(shale Oil)Development Xi'an710065ShaanxiChina Department of Electrical Engineering and Computer Science University of StavangerStavanger4036Norway School of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

Complex physical and chemical reactions during CO_(2)sequestration alter the microscopic pore structure of geological formations,impacting sequestration *** investigate CO_(2)sequestration dynamics,comprehensive physical simulation experiments were conducted under varied pressures,coupled with assessments of changes in mineral composition,ion concentrations,pore morphology,permeability,and sequestration capacity before and after ***,a method using NMR T2spectra changes to measure pore volume shift and estimate CO_(2)sequestration is *** quantifies CO_(2)needed for mineralization of soluble ***,when CO_(2)dissolves in crude oil,the precipitation of asphaltene compounds impairs both seepage and storage ***,the impact of dissolution and precipitation is closely associated with storage pressure,with a particularly pronounced influence on smaller *** pressure levels rise,the magnitude of pore alterations progressively *** a pressure threshold of 25 MPa,the rate of change in small pores due to dissolution reaches a maximum of 39.14%,while precipitation results in a change rate of-58.05%for small *** observed formation of dissolution pores and micro-cracks during dissolution,coupled with asphaltene precipitation,provides crucial insights for establishing CO_(2)sequestration parameters and optimizing strategies in low permeability reservoirs.

关键词： Dissolution Precipitation Pore structure CO_(2)sequestration Unconventional reservoirs

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Modelling of cantilever bank failure for peat-type meander bends in the source region of the Yellow River

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International Journal of Sediment research 2023年第3期38卷 421-431页

作者： Hanyuan Yang Zhiwei Li Yongjun Lu Huaixiang Liu Liqin Zuo State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute Yangtze Institute for Conservation and Development

Bank retreat involving a combination of fluvial erosion and bank collapse has been found to be a major contributor to sediment transport, lateral migration, and planform evolution of meandering *** studies have largely examined the general mechanism of cantilever bank failure. However, the composite process of beam(toppling) failure caused by shear failure of the lower part composed of noncohesive soil remains poorly understood. The current paper investigates the diversity and coupling of this collapse process, which is the dominant pattern in the peat-type meandering rivers of the Zoige River basin in the source region of the Yellow River. For this purpose, morphologic and hydraulic measurements were done in the summers of 2016 and 2017. Moreover, a combined method of a theoretical model and numerical simulation was developed to be applied for a continuous meandering channel in the Zoige basin, focusing in particular on five typical cross sections of a highly convoluted bend approaching neck cutoff. Specifically, the theoretical model evaluating the stability of overhanging riverbank was based on static equilibrium theory considering the interaction between composite soil layers. In addition, the Bank Stability and Toe Erosion Model was used to simulate the retreat process of the silt layer based on field measurements including bank morphology, soil composition, and hydrological parameters. Thus, a calculation method for the occurrence of cantilever beam failure in the flood period is proposed, and temporal change and spatial variability in bank profiles caused by three consecutive failures is estimated at the five sections. Satisfactory results showed a relatively close agreement between the calculations and field measurements in terms of the width of the overhanging arms and the dimensions of the slump blocks.

关键词： River bends Bank erosion Cantilever failure Numerical simulation Meandering river

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Intelligent recognition and information extraction of radar complex jamming based on time-frequency features

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Journal of Systems engineering and Electronics 2024年第5期35卷 1148-1166页

作者： PENG Ruihui WU Xingrui WANG Guohong SUN Dianxing YANG Zhong LI Hongwen College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China Qingdao Innovation and Development Center Harbin Engineering UniversityQingdao 266000China Information Fusion Research Institute Naval Aeronautical UniversityYantai 264001China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

In modern war,radar countermeasure is becoming increasingly fierce,and the enemy jamming time and pattern are changing more *** is challenging for the radar to efficiently identify jamming and obtain precise parameter information,particularly in low signal-to-noise ratio(SNR)*** this paper,an approach to intelligent recognition and complex jamming parameter estimate based on joint time-frequency distribution features is proposed to address this challenging ***,a joint algorithm based on YOLOv5 convolutional neural networks(CNNs)is proposed,which is used to achieve the jamming signal classification and preliminary parameter ***,an accurate jamming key parameters estimation algorithm is constructed by comprehensively utilizing chi-square statistical test,feature region search,position regression,spectrum interpolation,etc.,which realizes the accurate estimation of jamming carrier frequency,relative delay,Doppler frequency shift,and other ***,the approach has improved performance for complex jamming recognition and parameter estimation under low SNR,and the recognition rate can reach 98%under−15 dB SNR,according to simulation and real data verification results.

关键词： complex jamming recognition time frequency feature convolutional neural network(CNN) parameter estimation

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Chaotic Dynamics and Self-Recovery Control for a Magnetic-Levitation Spacecraft under Single-Rod Fault

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IEEE Transactions on Aerospace and Electronic Systems 2024年第3期61卷 5788-5798页

作者： Liao, He Wang, Daixin Xie, Jinjin Xu, Yi Yao, Chuang Tang, Zhongxing Nanjing University of Aeronautics and Astronautics College of Astronautics Nanjing211106 China Southeast University College of Instrument Science and Engineering Nanjing210018 China Shanghai Satellite Engineering Institute Research and Development Center Shanghai201109 China

The magnetic-levitation spacecraft is a potential solution to improve the attitude control accuracy of spacecraft in the future. However, if a single-rod fault has been occurred during the on-orbit phase, the inner collision of the magnetic-levitation spacecraft may cause chaos phenomenon. To address this problem, this study analyzes the maximum number of the actuator fault that a magnetic-levitation spacecraft can withstand firstly. Secondly, the chaotic dynamics is established by the Poincaré mapping approach, and the eigenvalues of the Jacobi matrix is thus analyzed to judge the its stability, which is adopted to preliminarily screen out the chaotic region. Thirdly, the self-recovery controller based on OGY method (a chaos control method proposed by Ott E., Grelogi C. and Yorke J.A.) is proposed to drive the collision trajectory out of the chaotic domain. Finally, the effectiveness and feasibility of the proposed approach is verified by numeric simulation. © 1965-2011 IEEE.

关键词： Jacobian matrices

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Cyclic quenching treatment doubles the Charpy V-notch impact energy of a 2.3 GPa maraging steel

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材料科学技术（英文版） 2025年第6期209卷 311-328页

作者： Xinlei Zhou Chunni Jia Peng Mi Honglin Zhang Wei Yan Wei Wang Mingyue Sun Sybrand van der Zwaag Lijian Rong School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016PR China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016PR China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016PR China China Aerodynamics Research and Development Center Mianyang 621000PR China Faculty of Aerospace Engineering Delft University of TechnologyDelftNetherlands

A cyclic quenching treatment(CQT)succeeded in turning a 2.3 GPa maraging steel with a Charpy impact energy of 9 J into a new grade with the same strength but a Charpy impact energy of 20 J upon 4 cyclic *** improvement of mechanical properties is attributed to the refinement and increased chemical heterogeneity of the martensitic substructure,rather than the refinement of prior austenite grain(PAG),as well as the Transformation-Induced Plasticity(TRIP)effect facilitated by small austenite *** role of local segregation of Ni during CQT in the formation of Ni-rich austenite grains,Ni-rich martensite laths and Ni-poor martensite laths,was investigated and verified by DICTRA *** study highlights the important influence of Ni partitioning behavior during CQT,providing insights into microstructural evolution and mechanical properties.

关键词： Maraging steel Cyclic quenching treatment Ni partitioning Ultrafine lath Austenite Toughness

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