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A rescaling algorithm for multi-relaxation-time lattice Boltzmann method towards turbulent flows with complex configurations

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Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1597-1612页

作者： Haoyang LI Weijian LIU Yuhong DONG Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai 200072China Shanghai Frontier Science Center of Mechanoinformatics Shanghai UniversityShanghai 200072China Shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

Understanding and modeling flows over porous layers are of great industrial *** accurately solve the turbulent multi-scale flows on complex configurations,a rescaling algorithm designed for turbulent flows with the Chapman-Enskog analysis is *** mesh layout and the detailed rescaling procedure are also *** numerical simulations(DNSs)for a turbulent channel flow and a porous walled turbulent channel flow are performed with the three-dimensional nineteen-velocity(D3Q19)multiple-relaxation-time(MRT)lattice Boltzmann method(LBM)to validate the accuracy,adaptability,and computational performance of the present rescaling *** results,which are consistent with the previous DNS studies based on the finite difference method and the LBM,demonstrate that the present method can maintain the continuity of the macro values across the grid interface and is able to adapt to complex *** reasonable time consumption of the rescaling procedure shows that the present method can accurately calculate various turbulent flows with multi-scale and complex configurations while maintaining high computational efficiency.

关键词： slattice Boltzmann method(LBM) direct numerical simulation(DNS) rescaling algorithm complex configuration

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Information Presentation Strategies to Promote Pedestrian Behavior Change in Mixed Spaces with Automated Vehicle

Information Presentation Strategies to Promote Pedestrian Be...

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2024 IEEE/SICE International Symposium on System Integration, SII 2024

作者： Nishiura, Yuki Yamada, Hiroyuki Kurazume, Ryo Graduate School of Information Science and Electrical Engineering Kyushu University Japan Center for Sustainability - Connective Automation Hitachi Ltd. Research and Development Group Autonomous Control Research Department Ibaraki312-0034 Japan Kyushu University Faculty of Information Science and Electrical Engineering Fukuoka819-0395 Japan

ISBN: (纸本)9798350312072

This paper introduces an information presentation strategy for pedestrians, aiming to enhance traffic efficiency in a mixed pedestrian-automated vehicle environment, such as a public road. While automated driving technology has made remarkable progress, interactions with pedestrians on regular roads have mostly been studied in virtual environments using virtual reality goggles. According to these studies, potential traffic efficiency and safety issues arise from pedestrians' limited understanding of automated vehicle behavior. To address this, we propose a human-machine interface employing a head-mounted display (HMD) to mitigate traffic efficiency degradation caused by pedestrians. The proposed system draws upon behavioral economics principles to encourage pedestrians to modify their behavior and develop better interactions with automated vehicles. Simulations were conducted to identify an information presentation strategy that strongly supports learning, and its effectiveness was further validated through experiments involving a real vehicle. Notably, the experimental results confirmed that the information presentation strategies proven effective in simulations also facilitated pedestrian learning during real-world interactions. © 2024 IEEE.

关键词： Virtual reality

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Dietary adenosine supplementation improves placental angiogenesis in IUGR piglets by up-regulating adenosine A2a receptor

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Animal Nutrition 2023年第2期13卷 282-288页

作者： Zifang Wu Jiawei Nie Deyuan Wu Shuangbo Huang Jianzhao Chen Huajin Liang Xiangyu Hao Li Feng Hefeng Luo Chengquan Tan Guangdong Provincial Key Laboratory of Animal Nutrition Control National Engineering Research Center for Breeding Swine IndustryInstitute of Subtropical Animal Nutrition and FeedCollege of Animal ScienceSouth China Agricultural UniversityGuangzhouGuangdong 510642China Dekon Food and Agriculture Group ChengduChina

Abnormal placental angiogenesis is associated with the occurrence of intrauterine growth restriction(IUGR)in piglets,and effective treatment strategies against this occurrence remain to be *** has been reported to play an important role in angiogenesis,but its role in placental angio-genesis is still ***,we investigated the effect of dietary adenosine supplementation on IUGR occurrence in piglets by analyzing the role of adenosine in placental angiogenesis for Normal and IUGR ***,88 sows were allotted to 2 treatments(n=44)and fed a basal diet supplemented with 0%or 0.1%of adenosine from day 65 of gestation until farrowing,followed by collecting the placental samples of Normal and IUGR piglets,and recording their *** results showed that adenosine supplementation increased the mean birth weight of piglets(P<0.05)and placental efficiency(P<0.05),while decreasing the IUGR piglet rate(P<0.05).Expectedly,the placenta for IUGR neonates showed a down-regulated vascular density(P<0.05)and angiogenesis as evidenced by the expression level of vascular cell adhesion molecule-1(VCAM1)(P<0.05).Notably,dietary adenosine supplementation promoted angiogenesis(P<0.05)both in the Normal and IUGR *** importantly,the expression level of adenosine A2a receptor(ADORA2A)was lower(P<0.05)in the IUGR placenta than in Normal placenta,whereas adenosine treatment could significantly increase ADORA2A expression,and also had an interaction effect between factors IUGR and ***,placentae for IUGR piglets showed impaired angiogenesis and down-regulated expression level of ADORA2A,while dietary adenosine supplementation could activate ADORA2A expression,improve the placental angio-genesis,and ultimately decrease the occurrence of IUGR in piglets.

关键词： Angiogenesis IUGR Placenta Adenosine ADORA2A

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Synergistic effect of oxygen vacancies and edging/corner-connected MnOs structural motifs in multi-dimensional manganese oxides to enhance OvOCs catalytic oxidation

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Chinese Chemical Letters 2023年第12期34卷 291-299页

作者： Yonggang Sun Ganggang Li Jie Cheng Na Li Xin Xing Xin Zhang Zhongshen Zhang State Key Laboratory of High-eficiency Coal Utilization and Green Chemical Engineering School of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China National Engineering Laboratory for VOCs pollution Control Material&Technology Research Center for Environmental Material and Pollution Control TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China College of Resources and Environment University of Chinese Academy of SciencesBejing 101408China

The structure-activity relationships for vinyl acetate catalytic oxidation are challenging to explore at the atomic scale due to the ambiguity of the structural defect types and sites of manganese *** work elaborates,at the atomic level,through in-situ experimental and theoretical methods,the synergistic effects of two types of structural defect sites of Vo-e(edge-sharing oxygen)and Vo-c(corner-sharing oxygen)and MnO6 structural motifs of manganese ***-dimensional manganese oxides,namely those with corner-connected MnOs structural motifs and Vo-c structural oxygen defect sites,significantly improved the activation of vinyl *** of enol structure formation,acetate and formate intermediate species,and tautomerism between enol structure and acetaldehyde were detected when oxygen vacancies of manganese oxides were present in combination with corner/edge-connected ***,the activation of chemical bonds and deep catalytic oxidation of vinyl acetate depend on the presence of a redox couple,surface oxygen species,and weakened Mn-O *** provides a valuable notion for investigating and designing catalytic systems and reaction processes for the purpose of emission reduction and the management of environmental contaminants.

关键词： Oxygen vacancies Synergistic effects MnO_(6)structural motifs In-situ technologies Catalytic oxidation

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Model Based Quadriceps Activation Strategy in Squat Training with Exhaustion Method Under Different Loads 8

Model Based Quadriceps Activation Strategy in Squat Training...

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8th International Symposium on Computer science and Intelligent control, ISCSIC 2024

作者： Xie, Cong Guo, Xin Qie, Botao Hebei University of Technology Control Engineering Technology Innovation Center of Hebei Province Hebei University of Technology School of Artificial Intelligence and Data Science Tianjin China

ISBN: (纸本)9798350380286

The aim of this study is to explore the muscle activation strategy of quadriceps muscle training in untrained sedentary people under different resistance training to exhaustion to provide control target for body state-based intelligence exercise equipment. Ten daily sedentary men with no training experience performed three sets of heavy load squats (single leg bench squat) in exhaustion mode (4RM) and one set of lower resistance squats (double leg squat with 10 KG garment) in exhaustion mode (18-26RM) to explore which and when the muscle fibers will be recruited as much as more. EMG signals from the dominant side of the vastus medialis), rectus femoris, and vastus lateralis in both squats were recorded, and the maximum RMS of 500 MS length in each movement was normalized to the maximum voluntary isometric contraction. Reliability analysis of the normalized EMG signal for each muscle between the three groups of heavy-load squats was as follows: Alpha (vastus medialis)= 0.885, Alpha (rectus femoris)=0.903, Alpha (vastus lateralis) = 0.925. Paired samples t-test of the three muscles under different resistance:p (vastus medialis) © 2024 IEEE.

关键词： Exercise equipment

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A Diagnosis Model for Rehabilitation Training Prescription for Spinal Cord Injury Patients Based on Multi-label Classification 8

A Diagnosis Model for Rehabilitation Training Prescription f...

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8th International Symposium on Computer science and Intelligent control, ISCSIC 2024

作者： Qie, Botao Guo, Xin Chen, Wei Hebei University of Technology School of Artificial Intelligence Control Engineering Technology Innovation Center of Hebei Province Tianjin China Nation Research Center for Rehabilitation Technical Aids Beijing China

ISBN: (纸本)9798350380286

Spinal Cord Injury (SCI) is a serious complication that occurs after a spinal fracture. It is the key to prescribe rehabilitation training according to the condition of patients. Therefore, this research proposed a diagnostic model for rehabilitation training prescription for SCI patients based on multi-label classification. Firstly, a data set of electronic medical records of 1441 SCI patients was constructed, and the data prediction processing was completed. By effectively utilizing the correlation between labels, the performance of multi-label classification models can be greatly improved, thereby increasing the diagnosis accuracy of SCI rehabilitation training prescription. We improved the classifier chain algorithm by calculating the influence of labels to determine the order of label chains, and then using mutual information to optimize the learning features of the base classifier to predict the rehabilitation prescriptions for patients. Compared with other improved algorithms, the model shows significant improvements in many metrics. Its hamming loss and ranking loss were 0.2104 and 0.3402, and precision, recall, and F1-score were 8 0. 2 9 %, 76.25%, and 76.23% respectively. In clinical treatment, this model can provide valuable diagnostic information for the clinical treatment of SCI patients, assist medical professionals and physicians in better clinical diagnosis, and enhances the reliability of clinical decisions. © 2024 IEEE.

关键词： Electronic health record

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Movement Along the Trajectory of a Home Quadruped Robot 1

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Proceedings of the 8th International Conference on Interactive Collaborative Robotics, ICR 2023

作者： Dobrynin, Dmitry Federal Research Center "Computer Science and Control" of Russian Academy of Sciences 44/2 Vavilova Street Moscow119333 Russia

ISBN: (数字)9783031431111

ISBN: (纸本)9783031431104

Home walking robots imitating pets have a high appeal due to increased maneuverability in a cramped home environment. Planning the movements of a home robot is an important component of the control system of a quadruped walking robot. The article deals with the problem of following the trajectory of a walking robot, which relates to motion planning. The article presents a model of a robot and a mathematical model of its legs. Two methods of approximation of the trajectory of motion are proposed in the article are piecewise linear approximation and approximation by arcs of a circle. The use of piecewise linear approximation makes it possible to solve the problem using simple robot movements. The use of approximation by arcs of a circle allows you to build a universal gait for a walking robot. The simulation of robot movements using two types of approximations is carried out. The article presents experimental modeling data. It is shown that the average speed of a walking robot with piecewise linear approximation is significantly lower than the speed of the robot moving in a straight line. The article presents the conclusions drawn from the results of experiments. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Motion planning

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Intelligent Fault Diagnosis Method of Rolling Bearings Based on Transfer Residual Swin Transformer with Shifted Windows

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Structural Durability & Health Monitoring 2024年第2期18卷 91-110页

作者： Haomiao Wang Jinxi Wang Qingmei Sui Faye Zhang Yibin Li Mingshun Jiang Phanasindh Paitekul The Institute of Marine Science and Technology Shandong UniversityQingdao26623China The School of Control Sciences and Engineering Shandong UniversityJinan250061China Thailand Institute of Scientific and Technological Research Amphoe Khlong LuangPathum Thani12120Thailand

Due to their robust learning and expression ability for complex features,the deep learning(DL)model plays a vital role in bearing fault ***,since there are fewer labeled samples in fault diagnosis,the depth of DL models in fault diagnosis is generally shallower than that of DL models in other fields,which limits the diagnostic *** solve this problem,a novel transfer residual Swin Transformer(RST)is proposed for rolling bearings in this *** has 24 residual self-attention layers,which use the hierarchical design and the shifted window-based residual *** with transfer learning techniques,the transfer RST model uses pre-trained parameters from ImageNet.A new end-to-end method for fault diagnosis based on deep transfer RST is ***,wavelet transform transforms the vibration signal into a wavelet time-frequency *** signal’s time-frequency domain representation can be represented ***,the wavelet time-frequency diagram is the input of the RST model to obtain the fault ***,our method is verified on public and self-built *** results show the superior performance of our method by comparing it with a shallow neural network.

关键词： Rolling bearing fault diagnosis transformer self-attention mechanism

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On Approximation of the Time-Probabilistic Measures of a Resource Loss System with the Waiting Buffer 25th

On Approximation of the Time-Probabilistic Measures of a...

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25th International Conference on Distributed Computer and Communication Networks, DCCN 2022

作者： Daraseliya, A.V. Sopin, E.S. Shorgin, S. Ya. Moscow Russia Institute of Informatics Problems Federal Research Center Computer Science and Control of Russian Academy of Sciences Moscow Russia

ISBN: (纸本)9783031306471

In this paper we consider a multi-server model in terms of a resource loss system with the waiting buffer and the multi-type of resources. A customer accepted for servicing occupies a random amount of resources with described distribution functions. Based on the assumptions of a Poisson arrival process and exponential service times, we analytically find the system of equilibrium equations. We proposed an approximation of the model with the single type of resources. We analytically find the system of equilibrium equations, solving which we get the stationary probabilities for the simpler model. For various probability distributions, we evaluated metrics of interest such as the loss probability of the system, the average waiting time, the average number of customers, and the average resource requirements of blocked customers. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Distribution functions

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Efficient C-N coupling in electrocatalytic urea generation on copper carbonate hydroxide electrocatalysts

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Journal of Energy Chemistry 2024年第6期93卷 289-298,I0008页

作者： Yinuo Wang Yian Wang Qinglan Zhao Hongming Xu Shangqian Zhu Fei Yang Ernest P.Delmo Xiaoyi Qiu Chi Song Juhee Jang Tiehuai Li Ping Gao MDanny Gu Minhua Shao Advanced Materials Thrust The Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400GuangdongChina Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Materials Science and Engineering Southern University of Science and Technology of Chin11088 Xueyuan BoulevardShenzhen 518055GuangdongChina Energy Institute and Chinese National Engineering Research Center for Control&Treatment of Heavy Metal PollutionThe Hong Kong University of Science and TechnologyKowloonHong KongChina Department of Chemistry City University of Hong KongTat Chee AvenueKowloonHong KongChina

Urea generation through electrochemical CO_(2) and NO_(3)~-co-reduction reaction(CO_(2)NO_(3)RR)is still limited by either the low selectivity or yield rate of ***,we report copper carbonate hydroxide(Cu_2(OH)_2CO_(3))as an efficient CO_(2)NO_(3)RR electrocatalyst with an impressive urea Faradaic efficiency of45.2%±2.1%and a high yield rate of 1564.5±145.2μg h~(-1)mg_(cat)~(-1).More importantly,H_(2) evolution is fully inhibited on this electrocatalyst over a wide potential range between-0.3 and-0.8 V versus reversible hydrogen *** thermodynamic simulation reveals that the first C-N coupling follows a unique pathway on Cu_2(OH)_2CO_(3) by combining the two intermediates,~*COOH and~**** work demonstrates that high selectivity and yield rate of urea can be simultaneously achieved on simple Cu-based electrocatalysts in CO_(2)NO_(3)RR,and provide guidance for rational design of more advanced catalysts.

关键词： Copper carbonate hydroxide Co-reduction Urea generation C-N coupling DFT calculation

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