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51st International Congress and Exposition on Noise Control Engineering, Internoise 2022

作者： Zhu, Zhen He, Hongsen Chen, Jingdong School of Information Engineering Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang621010 China CIAIC Shaanxi Provincial Key Laboratory of Artificial Intelligence Northwestern Polytechnical University Xi'an710072 China

ISBN: (纸本)9781906913427

Time delay estimation (TDE) plays a significant role in hands-free speech communication systems for localizing and tracking speakers. To boost the robustness of time delay estimators in room acoustic environments, a novel TDE approach is proposed in this paper. This method first exploits the reciprocals of average magnitude difference functions of sound signals captured at a microphone array, instead of cross correlation coefficients, to construct the entries of the parameterized correlation coefficient matrix in the multichannel cross-correlation coefficient algorithm. A multichannel average magnitude difference coefficient is then defined to establish the phase delay estimator. Simulation results demonstrate that the proposed TDE strategy can yield better performance in noisy and reverberant environments as compared to the multichannel cross-correlation coefficient method. © 2022 Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering. All rights reserved.

关键词： Microphone array

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TIME DIFFERENCE OF ARRIVAL ESTIMATION USING FOURTH-ORDER CUMULANT IN SPATIALLY CORRELATED NOISE 28

TIME DIFFERENCE OF ARRIVAL ESTIMATION USING FOURTH-ORDER CUM...

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28th International Congress on Sound and Vibration, ICSV 2022

作者： Tao, Tingting He, Hongsen Zhang, Limin School of Information Engineering Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang China School of Electronic Science and Engineering Nanjing University Nanjing China

ISBN: (纸本)9789811850707

Time difference of arrival (TDOA) estimation, which aims at estimating the relative time-delay using the signals received by an array of microphones, plays an important role in hands-free speech communication systems for localizing and tracking sound sources. To enhance the robustness of TDOA estimators to spatially correlated noise, a new method using fourth-order cumulants is proposed. This approach generalizes the fourth-order cumulant based TDOA estimation from two- to multiple-channel cases. A parameterized fourth-order cumulant matrix is constructed, which is used to establish a robust TDOA estimator. Numerical experiments show that the proposed TDOA estimation technique can make use of redundancy among multiple microphones to improve the immunity to the spatially correlated noise and reverberation. © International Institute of Acoustics and Vibration (IIAV), 2022.

关键词： Time difference of arrival

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A Sensitive Enzyme-Free Electrochemical Sensor Based On Zinc Tungstate @ Cobalt Magnetic Nanoporous Carbon @ Molecularly Imprinted Polymer (Znwo4@Co-Mnpc@Mip) for Specific Recognition and Determination of Chloramphenicol in Milk Sample

SSRN

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SSRN 2024年

作者： Yao, Mingcai Dong, Liang Fu, Yu Hang Li, Haijun Luo, Guang College of Bioengineering Sichuan University of Science & Engineering Zigong643000 China The Liquor Making Biological Technology Application of Key Laboratory of Sichuan Province Yibin644000 China Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education Zigong643000 China

We have carefully built a new chloramphenicol (CAP) electrochemical sensor with zinc tungstate @ cobalt magnetic nanoporous carbon @ molecularly imprinted polymer (ZnWO4@Co-MNPC@MIP) as the core. Firstly, Co-MNPC nanomaterials were successfully prepared by efficient one-step hydrothermal method and direct carbonization method. Next, we recombined ZnWO4 with Co-MNPC and synthesized a new ZnWO4@Co-MNPC complex by hydrothermal method. To further improve its performance, we coated the surface of ZnWO4@Co-MNPC with a molecularly imprinted (MIP) shell by precipitation polymerization. Under optimal conditions, the ZnWO4@Co-MNPC@MIP electrode has a stronger CAP detection peak current with a fairly wide linear range: 0.007~200 μM and 200~1400 μM. The detection limit is as low as 0.0027 μM, allowing the sensor to maintain excellent selectivity and stability. After practical application, we found that the ZnWO4@Co-MNPC@MIP modified electrode performed well in milk samples. © 2024, The Authors. All rights reserved.

关键词： Zinc compounds

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Bidirectional Weighted Co-Association-Based Clustering Ensemble Algorithm for High-Speed Train Delay Prediction 29th

Bidirectional Weighted Co-Association-Based Clustering Ensem...

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29th International Conference on Computational and Experimental Engineering and Sciences, ICCES 2023

作者： Zhao, Yi Bai, Muchen Ni, Panpan Jiang, Yunan Feng, Xuan Zhang, Xiaobo School of Design SouthWest Jiaotong University Chengdu611756 China School of Computing and Artificial Intelligence SouthWest Jiaotong University Chengdu611756 China Sichuan Institute of Computer Sciences Chengdu610042 China National Engineering Laboratory of Integrated Transportation Big Data Application Technology Southwest Jiaotong University Chengdu611756 China Manufacturing Industry Chains Collaboration and Information Support Technology Key Laboratory of Sichuan Province Southwest Jiaotong University Chengdu611756 China

ISBN: (纸本)9783031425141

In recent years, high-speed trains are one of the popular research topics in the field of transportation and have attracted much attention from scholars at home and abroad in view of their high efficiency and safety features. High-speed trains are susceptible to unexpected situations of delayed arrival due to the disturbance of external factors including wind and temperature during the trip. The delay of high-speed trains has a vital impact on people's work efficiency and living standards. To solve the problem of intelligent forecast of high-speed train delay, we design and implement a clustering ensemble algorithm based on text data of bullet train operation environment monitoring. We firstly combine the concepts of cosine similarity, Jaccard similarity and information entropy, then fuse a bidirectional weighting formula, and further propose a novel Clustering Ensemble algorithm based on Bidirectional Weighted Co-association (CE-BWC). This approach consists of an inter-cluster weighting formula used to obtain the implicit generalized information by weighting each cluster between clusters, and a reliability weighting formula transferring the cluster information to the data item itself to measure the correlation degree of the data group. Experiments prove that our CE-BWC has better prediction performance for high-speed train delay and outperforms the state-of-the-art benchmark algorithms. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Efficiency

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Changes in Water Use Efficiency Caused by Climate Change,CO_(2) Fertilization,and Land Use Changes on the Tibetan Plateau

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Advances in Atmospheric Sciences 2023年第1期40卷 144-154页

作者： Binghao JIA Xin LUO Longhuan WANG Xin LAI State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjing 210044China Key Lab of Virtual Geographic Environment(Nanjing Normal University) Ministry of EducationNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information TechnologyChengdu 610225China

Terrestrial ecosystem water use efficiency(WUE)is an important indicator for coupling plant photosynthesis and transpiration,and is also a key factor linking the carbon and water cycles between the land and ***,under the combination of climate change and human intervention,the change in WUE is still unclear,especially on the Tibetan Plateau(TP).Therefore,satellite remote sensing data and process-based terrestrial biosphere models(TBMs)are used in this study to investigate the spatiotemporal variations of WUE over the TP from 2001 to ***,the effects of land use and land cover change(LULCC)and CO_(2) fertilization on WUE from 1981-2010 are assessed using *** show that climate change is the leading contributor to the change in WUE on the TP,and temperature is the most important *** makes a negative contribution to WUE(-20.63%),which is greater than the positive contribution of CO_(2) fertilization(11.65%).In addition,CO_(2) fertilization can effectively improve ecosystem resilience on the *** the northwest plateau,the effects of LULCC and CO_(2) fertilization on WUE are more pronounced during the driest years than the annual *** findings can help researchers understand the response of WUE to climate change and human activity and the coupling of the carbon and water cycles over the TP.

关键词： water use efficiency gross primary productivity evapotranspiration Tibetan Plateau carbon and water cycle

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Atomic structure and collision dynamics with highly charged ions

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Chinese Physics B 2022年第9期31卷 13-40页

作者： Xinwen Ma Shaofeng Zhang Weiqiang Wen Zhongkui Huang Zhimin Hu Dalong Guo Junwen Gao Bennaceur Najjari Shenyue Xu Shuncheng Yan Ke Yao Ruitian Zhang Yong Gao Xiaolong Zhu Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Sichuan UniversityChengdu 610064China Department of Physics Hangzhou Normal UniversityHangzhou 311121China Shanghai EBIT Laboratory Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE)Fudan UniversityShanghai 200433China

The research progresses on the investigations of atomic structure and collision dynamics with highly charged ions based on the heavy ion storage rings and electron ion beam traps in recent 20 years are *** structure part covers test of quantum electrodynamics and electron correlation in strong Coulomb field studied through dielectronic recombi-nation spectroscopy and VUV/x-ray *** collision dynamics part includes charge exchange dynamics in ion-atom collisions mainly in Bohr velocity region,ion-induced fragmentation mechanisms of molecules,hydrogen-bound and van de Waals bound clusters,interference,and phase information observed in ion-atom/molecule *** this achievements,two aspects of theoretical studies related to low energy and relativistic energy collisions are *** applications of data relevant to key atomic processes like dielectronic recombination and charge exchanges involving highly charged ions are *** the end of this review,some future prospects of research related to highly charged ions are proposed.

关键词： highly charged ion atomic structure collision dynamics quantum electrodynamics fragmentation mechanisms relativistic effects electron correlation

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Research on panoramic camera system for geotechnical borehole monitoring

Research on panoramic camera system for geotechnical borehol...

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2024 Applied Optics and Photonics China: Optical Sensing, Imaging technology, and applications, AOPC 2024

作者： Xian, Yongli Chen, Xuejian Wang, Congzheng Zhao, Guangxin Peng, Bo School of Electrical Engineering and Electronic Information Xihua University Chengdu610039 China School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu610054 China Institute of Optics and Electronics Chinese Academy of Sciences Chengdu610200 China Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang621010 China

ISBN: (数字)9781510687820

ISBN: (纸本)9781510687813

To achieve short-range, dynamic panoramic imaging and high-resolution visual inspection of local areas of interest (ROIs) of the inner wall of a long borehole, a panoramic camera system for rock borehole condition detection is developed. The system is capable of generating a 360°panoramic image from a single frame. This is achieved by leveraging the small focal length and the exceptionally large angle of a single fisheye lens. The system's side incorporates a high-definition camera module, enabling the system to perform high-resolution inspection of any targeted region through rotation. Furthermore, the primary structure of the camera system incorporates a self-balanced design to maintain the coherence between the optical axis and the target center. The wheel-coded counting method effectively compensates for the axial orientation information of the system. By integrating it with the overlapping field of view from adjacent frames in panoramic imaging, it becomes feasible to capture panoramic images of the inner wall of long channels. Experimental results demonstrate that the system can achieve high-resolution panoramic imaging over short distances with long channels. With the assistance of the self-balanced structure and axial orientation module, the system provides a foundation for panoramic unwrapping of long channels. It further offers valuable quantitative data for intelligent evaluation of geotechnical holes. © 2024 SPIE.

关键词： Cameras

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Research on the Trajectory Tracking Control of a Swinging Spherical robot 6

Research on the Trajectory Tracking Control of a Swinging Sp...

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6th International Conference on Control and robotics Engineering, ICCRE 2021

作者： Cui, Guiyang Yang, Haiyan Xiong, Kaifeng Zhang, Hua Guo, Mingming Southwest University of Science and Technology Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Mianyang621010 China

ISBN: (纸本)9780738126128

The spherical robot was a kind of mobile robot which used the spherical shell to roll to realize its own motion. It had the characteristics of a small turning radius and omnidirectional motion. Besides the structure of the spherical robot was multitudinous, a kind of two degrees of freedom of the oscillating XK-II spherical robot was designed in this paper. Likewise, the motion principle and the structure of the XK-II spherical robot were introduced in this paper. The relation of speed vector projection and the description method of Euler Angle were used in the paper to establish the two inputs and five outputs kinematics equation of the XK-II type spherical robot. Then, the kinematics equation was solved by using the four order-five order Runge-Kutta algorithm, at the same time, the trajectory tracking controller of line, roundness, sinusoid and Lissajous figures were designed by combining PID. Finally, the kinematics model was validated by simulation and real experiment, and the trajectory tracking control of the spherical robot was realized effectively. © 2021 IEEE.

关键词： Kinematics

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Parameter-Sharing-Based Average-Consensus Time Synchronization in IoT Networks

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IEEE Internet of Things Journal 2023年第9期10卷 8215-8227页

作者： Shi, Fanrong Yang, Simon X. Mukherjee, Mithun Jiang, Hong Da Costa, Daniel Benevides Wong, Wing-Kwong Southwest University of Science and Technology Robot Technology Used for Special Environment Key Laboratory of Sichuan Province School of Information Engineering Mianyang621010 China School of Engineering University of Guelph Advanced Robotics and Intelligent Systems Laboratory GuelphONN1G 2W1 Canada Nanjing University of Information Science and Technology School of Artificial Intelligence School of Future Technology Nanjing210044 China Technology Innovation Institute Abu Dhabi United Arab Emirates National Yunlin University of Science and Technology Future Technology Research Center Douliu64002 Taiwan

Average-consensus protocol is one of the ways to develop distributed time-synchronization algorithms in Internet of Things (IoT) networks. However, the large number of iteration leads to a common time notion issue in nodes. This poses a critical challenge in the convergence of the time-synchronization algorithm and resulting asymptotic convergence in the average consensus protocol. In this article, a parameter-sharing-based average-consensus time-synchronization (PACTS) algorithm is proposed. For fast convergence, the proposed PACTS quickly forwards the time information to multihop nodes and employs multihop average-consensus instead of single-hop average consensus. Specifically, a node asynchronously and periodically broadcasts the relative clock offset estimation of neighbors with its local time information. Meanwhile, the relative clock offset estimation of the multihop node is calculated and used to estimate the average value. Consequently, an average consensus among local multihop nodes is obtained. As a result, the iteration number and convergence time are significantly reduced over the network. Finally, the experimental results indicate that the proposed PACTS algorithm has low complexity, high accuracy, and quick convergence. © 2023 IEEE.

关键词： Topology

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Research on predictive control system for inspection robots based on digital twins

Research on predictive control system for inspection robots ...

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robotics, Artificial Intelligence and Intelligent Control (RAIIC), International Conference on

作者： Yu Liu Hongwei Liu Manlu Liu Xin Liu School of Information Engineering Southwest University of Science and Technology Mianyang China Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang China

ISBN: (数字)9798350352627

ISBN: (纸本)9798350352634

In order to improve the motion stability and monitorability of inspection robots, a digital twin predictive control system for inspection robots based on Unity3D and robot Operating System (ROS) is proposed. Firstly, with the support of wireless communication technology and ROS system, the mapping of virtual-real space scene and robot state is carried out through TCP/IP protocol; secondly, considering the impact of data communication lag and signal loss on the control system, a predictive control model is constructed to control the robot’s motion in order to reduce the reliance on real-time data, and the predictive control model is optimized by using Laguerre’s function as well as filtering algorithm to optimize the control response and mitigate control oscillations in time; finally, in the virtual decision space, the physical robot is driven to follow the predicted trajectory in a synchronized mapping manner. The experimental results prove that the digital twin control system has good tracking performance and is stable and reliable. Compared with that before model optimization, the efficiency is improved by $50.93 \%$ and the error is reduced by $69.23 \%$.

关键词： Predictive models Inspection Aerospace electronics robot sensing systems Control systems Data models Digital twins

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