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An Improved Sensor Fault Diagnosis Scheme Based on TA-LSSVM and ECOC-SVM

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Journal of Systems Science & Complexity 2018年第2期31卷 372-384页

作者： GU Xiaodan DENG fang GAO Xin ZHOU rui School of Automation Beijing Institute of Technology Beijing 100081 China Department of Information Equipment Equipment Institute of PLA Beijing 101416 China School of Automation Beijing Institute of Technology Beijing 100081 China.

Monitoring the operational state of sensors promptly and the accurate diagnosis of faults are essential. This paper proposes an improved fault diagnosis scheme for sensors, which includes both fault detection and fault identification. Firstly, trend analysis combined with least squares support vector machine（TA-LSSVM） method is proposed and implemented to detect faults. Secondly, an improved error correcting output coding-support vector machine（ECOC-SVM） based fault identification method is proposed to distinguish different sensor failure modes. To demonstrate the effectiveness of the proposed scheme, experiments are conducted with an MTi-series sensor, and some comparisons are made with other fault identification methods. The experimental results demonstrate that the proposed fault diagnosis scheme offers an essential improvement with detection real-time property and better identification accuracy.

关键词： ECOC fault detection, fault identification SVM TA.

Nanomechanics: emerging opportunities for future computing

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Science China(Information Sciences) 2021年第10期64卷 245-247页

作者： Zenghui WANG Jiawei fang Pengcheng ZHANG rui YANG Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University

The exploration for greater computing power has existed for a long time. Since the 1960 s, transistors in modern electronic computers have kept advancing following Moore’s ***, as silicon transistors continue to scale down, they face challenges such as increases in OFF-state leakage power due to the limited subthreshold swing, incompatibility with high-temperature operation, and lack of ***, new types of computing devices are being explored to address these problems.

关键词： Information Systems and Communication Service

Theoretical Study on the Reaction Mechanism between Dichlorocarbene and Armchair Single-walled Carbon Nanotubes

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Chinese Journal of Structural Chemistry 2006年第9期25卷 1120-1128页

作者： LI rui-fang SHANG Zhen-Feng XU Xiu-fang WANG Gui-Chang Department of Chemistry Nankai University Tianjin 300071 China

The reaction mechanism between CC12 and armchair single-walled carbon nanotubes （ASWCNTs）（3,3） and （4,4） has been studied by semiempirical AM1 and ab initio methods. The activation barriers of CC12 adding to ASWCNT （3,3） and （4,4） are computed and compared. The lower barrier of CC12 forms cycloaddition isomer on （3,3） maybe because the strain energy of （3,3） is larger than that of （4,4）. Our theoretical results are consistent with the experimental results.

关键词： armchair single-walled carbon nanotubes dichlorocarbene reaction mechanism theoretical study

Ground State and Its Topological Properties of Three-Dimensional Spin-Orbit Coupled Degenerate Fermi Gases

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Chinese Physics Letters 2023年第12期40卷 143-148页

作者： Long Xiong Ming Gong Zhao-Xiang fang rui Sun International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Key Lab of Quantum Information of Chinese Academy of Sciences School of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

Three-dimensional(3D)degenerate Fermi gases in the presence of spin-orbit coupling,inducing various kinds of physical findings and phenomena,have attracted tremendous attention in these *** investigate the 3D spin-orbit coupled degenerate Fermi gases in theory and first present the analytic expression of their ground *** study provides an innovative perspective into understanding of the topological properties of 3D unconventional superconductors,and describes the topological phase transitions in trivial and topological phase ***,such a system is provided with a richer set of Cooper pairings than traditional *** dual Cooper pairs with same spin directions emerge and exhibit peculiar behaviors,leading to topological phase *** study and discussion can be generalized to some other types of unconventional superconductors and areas of optical lattices.

关键词： Fermi topological degenerate

2-Ethyl-9,10-anthraquinone assisted sol–gel synthesis of Pd/γ-Al2O3 nanorods with enhanced catalytic performance in 2-ethyl-9,10-anthraquinone hydrogenation

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1863-1869页

作者： Weiquan cai Junlin Zhuo Jimin fang Zhichao Yang School of Chemistry and Chemical Engineering Guangzhou University230 Guangzhou University City Outer Ring RoadGuangzhou 510006China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

A series of nanorod-like porous Pd/γ-Al2 O3 catalysts with controllable textural properties and enhanced catalytic performance in 2-ethyl-9,10-anthraquinone(eAQ) hydrogenation for H2 O2 preparation were successfully prepared via a facile sol-gel method using aluminum isopropoxide as aluminum precursor and eAQ as structure directing agent,sequential calcination and impregnation process with Na2 PdCl4 *** physicochemical properties of the catalysts obtained with different addition amounts of *** comparatively characterized by XRD,TG-DSC,BET,TEM,CO-TPR,H2-TPR and H2-O2 *** results show that addition of eAQ can not only effectively control the textural properties(surface area,pore volume and average pore size) of the catalysts,but also lower their reduction temperature of active ***,the catalyst obtained with an addition amount of 4 wt% eAQ shows the highest hydrogenation efficiency of 10.28 g·L^-1,which is 37.3% higher than 7.49 g·L^-1 of the catalyst obtained without eAQ.

关键词： Catalyst Hydrogenation Alumina 2-Ethyl-9,10-anthraquinone Structure directing agent H2O2

POD analysis on vortical structures in MVG wake by Liutex core line identification

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Journal of Hydrodynamics 2020年第3期32卷 497-509页

作者： Xiang-rui Dong Xiao-shu cai Yinlin Dong Chaoqun Liu School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Multiphase Flow and Heat Transfer in Shanghai Power Engineering Shanghai 200093China Department of Mathematics University of Central ArkansasConway 72035USA Department of Mathematics University of Texas at ArlingtonArlington 76019USA

The Liutex core line method, first combined with the snapshot proper orthogonal decomposition (POD), is utilized in a supersonic micro-vortex generator (MVG) wake flow at Ma = 2.5 and Reθ = 5 760 to reveal the physical significance of each POD mode of the flow field. Compared with other scalar-based vortex identification methods, the Liutex core line identification is verified to be the most appropriate approach that is threshold-free and provides full information of a fluid rotation motion. Meanwhile, the Liutex integration is employed to quantitatively track the evolution of the vortices in MVG wake and is applied to the determination of the effective control section of the MVG wake for the optimization study of MVG design. The physical mechanism of each POD mode for multi-scale and multi-frequency vortical structures is investigated by using Liutex core line identification to give some revelations. For the mean mode (mode 0) indicating the time-averaged velocity flowfield of the MVG wake flow, a pair of primary counter-rotating streamwise vortices and another pair of secondary vortices is uniquely identified by two pairs of Liutex core lines with Liutex magnitude. In contrast, mode 1 is featured by a fluctuated roll-up motion of streamwise vortex, and the streamwise component of the MVG wake is demonstrated to be dominant in terms of the total kinetic energy contribution. Meanwhile, a dominant shedding frequency of St = 0.072 is detected from the temporal behavior of mode 2, which has the organized arc-shaped vortex structures shedding from MVG induced by the K-H instability. Additionally, mode 4 subjects to low-frequency oscillations of the wall vortices and thus takes a relatively lower frequency of St = 0.044.

关键词： Proper orthogonal decomposition(POD) vortex identification Liutex vortex core lines micro-vortex generator(MVG)

Global Stability for a Heroin Model with Age-Dependent Susceptibility

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Journal of Systems Science & Complexity 2015年第6期28卷 1243-1257页

作者： fang Bin LI Xuezhi MARTCHEVA Maia cai Liming Department of Mathematics Xinyang Normal University Beijing Institute of Information and Control Department of Mathematics University of Florida

This paper considers global asymptotic properties for an age-structured model of heroin use based on the principles of mathematical epidemiology where the incidence rate depends on the age of susceptible individuals. The basic reproduction number of the heroin spread is obtained. It completely determines the stability of equilibria. By using the direct Lyapunov method with Volterra type Lyapunov function, the authors show that the drug-free equilibrium is globally asymptotically stable if the basic reproduction number is less than one, and the unique drug spread equilibrium is globally asymptotically stable if the basic reproduction number is greater than one.

关键词： Age-structured basic reproduction number equilibrium global stability heroin model

A novel AE source localization method using clustering detection to eliminate abnormal arrivals

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International Journal of Mining Science and Technology 2022年第1期32卷 51-62页

作者： Yichao rui Zilong Zhou Jianyou Lu Barkat Ullah Xin cai School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Due to the significant effect of abnormal arrivals on localization accuracy,a novel acoustic emission(AE)source localization method using clustering detection to eliminate abnormal arrivals is proposed in the ***,iterative weight estimation is utilized to obtain accurate equation ***,according to the distribution of equation residuals,clustering detection is used to identify and exclude abnormal ***,the AE source coordinate is recalculated with remaining normal *** results of pencil-lead breaks indicate that the proposed method can achieve a better localization result with and without abnormal *** results of simulation tests further demonstrate that the proposed method possesses higher localization accuracy and robustness under different anomaly ratios and scales;even with abnormal arrivals as high as 30%,the proposed localization method still holds a correct detection rate of 91.85%.

关键词： Acoustic emission Source localization Abnormal arrivals Clustering detection

A novel robust AE/MS source location method using optimized M-estimate consensus sample

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International Journal of Mining Science and Technology 2022年第4期32卷 779-791页

作者： Yichao rui Zilong Zhou Xin cai Riyan Lan Congcong Zhao School of Resources and Safety Engineering Central South UniversityChangsha 410083China Guangxi Xinfazhan Communication Group Company Limited Nanning 530029China

Due to the complexity of the real engineering environment, the arrival measurement inevitably contains outliers and leads to serious location errors. In order to eliminate the influence of the outliers effectively,this paper proposes a novel robust AE/MS source localization method using optimized M-estimate consensus sample. First, a sample subset is selected from the entire arrival set to obtain fitting model and its parameters. Second, consensus set is determined by checking the arrivals with the fitting model instantiated by the estimated model parameters. Third, optimization process is performed to further optimize the consensus set. The above steps are iterated, and the final source coordinates are obtained by using all the elements in the optimal consensus set. The novel method is validated by a pencil-lead breaks experiment. The results indicate that the novel method has better location accuracy of less than 5 mm compared to existing methods, regardless of the presence or absence of outliers. With the increase of outlier scale and outlier ratio, the location result of the proposed method is always more stable and accurate than that of the existing methods. Mine blasting experiments further demonstrate that the new method holds good prospects for engineering applications.

关键词： Microseismic source Acoustic emission Source localization Outliers Consensus sample