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Nonlinear distributed filtering for time-varying saturated stochastic systems with cyber-attack via FlexRay regulation mechanism

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Journal of the Franklin Institute 2025年第11期362卷

作者： Li, Jiaxing Hu, Jun Du, Junhua Zhu, Mingqing Zhang, Ruixue Department of Applied Mathematics Harbin University of Science and Technology Harbin 150080 China National Key Laboratory of Autonomous Intelligent Unmanned Systems Beijing Institute of Technology Beijing 100081 China Intelligent Manufacturing Institute Heilongjiang Academy of Sciences Harbin 100081 China College of Mechanical and Electrical Engineering Harbin Engineering University Harbin 150001 China

In this paper, the distributed recursive filtering (DRF) issue is addressed for time-varying saturated stochastic systems, where the communications between sensors and filters undergo the FlexRay regulation protocol (FRRP) and false data injection attack. For the sake of mitigating undesirable data congestion, the FRRP is implemented in the communication channel to regulate data transmission. The false data injection attack might occur in the transmission process owing to open yet vulnerable networked environments. The focus of this paper is to develop a novel resource-saving DRF scheme and performance evaluation criterion under the framework of variance constraint. Specifically, an upper bound on the filtering error covariance (UBFEC) is firstly derived and then such a UBFEC is minimized via selecting a proper filter gain. Moreover, the boundedness of UBFEC is examined according to the matrix theory and the theoretical proof is presented. Finally, a comparative simulation experiment with practical application in mass–spring system is exploited to verify the validity of the newly designed DRF strategy. © 2025 The Franklin Institute

关键词： Boundedness analysis False data injection attack FlexRay regulation protocol Nonlinear distributed recursive filtering Time-varying saturated stochastic systems

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Strong-coupling anisotropic s-wave superconductivity in the type-II Weyl semimetal TaIrTe4

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Physical Review B 2021年第17期103卷 174508-174508页

作者： Diandong Tang Yan Chen Meng Yang Qiming Wang Yuxiao Zou Xin Wang Zezhong Li Changjiang Yi Youguo Shi Xiangmu Kong Guofeng Song Yun Xu Xin Wei Michael Weinert Lian Li Weihai Fang Ying Liu College of Chemistry Beijing Normal University Beijing 100875 China Department of Physics University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Beijing Key Laboratory of Inorganic Stretchable and Flexible Information Technology Beijing 100083 China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China College of Physics and Engineering Qufu Normal University School Qufu 273165 China School of Physics and Optoelectronic Engineering Ludong University Yantai 264025 China Department of Physics and Astronomy West Virginia University Morgantown West Virginia 26506 USA

TaIrTe4 is a recently discovered type-II Weyl semimetal, hosting only four Weyl points. Here, we study the cleaved TaIrTe4 crystal using scanning tunneling microscopy/spectroscopy and find that it also hosts a superconducting state with a transition temperature of 3.9 K. From Dynes function fitting, the superconducting phase is consistent with anisotropic s-wave pairing, with a superconducting gap of 1.31 meV. This value leads to a value of 2Δmax/kBTC=7.81, much larger than the 3.53 predicted by Bardeen-Cooper-Schrieffer theory for weak-coupling superconductors. The critical field is found to be 0.7 T based on the analysis of tunneling conductance as a function of magnetic field. Two types of nonmagnetic defects on the TaIrTe4 surface are observed, neither of which induce bound states inside the superconducting gap, further supporting conventional s-wave superconductivity in the TaIrTe4 system.

关键词： Superconductivity Superconductors Surfaces Weyl semimetal

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Construction of Porous Organic/Inorganic Hybrid Polymers Based on Polyhedral Oligomeric Silsesquioxane for Energy Storage and Hydrogen Production from Water

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Polymers 2023年第1期15卷 182-182页

作者： Mohamed, Mohamed Gamal Elsayed, Mohamed Hammad Ye, Yunsheng Samy, Maha Mohamed Hassan, Ahmed E. Mansoure, Tharwat Hassan Wen, Zhenhai Chou, Ho-Hsiu Chen, Kuei-Hsien Kuo, Shiao-Wei Department of Materials and Optoelectronic Science College of Semiconductor and Advanced Technology Research Center for Functional Polymers and Supramolecular Materials National Sun Yat-sen University Kaohsiung804 Taiwan Chemistry Department Faculty of Science Assiut University Assiut71515 Egypt Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Chemistry Faculty of Science Al-Azhar University Nasr City Cairo11884 Egypt CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou350002 China University of Chinese Academy of Sciences Beijing100049 China Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung807 Taiwan

In this study, we used effective and one-pot Heck coupling reactions under moderate reaction conditions to construct two new hybrid porous polymers (named OVS-P-TPA and OVS-P-F HPPs) with high yield, based on silsesquioxane cage nanoparticles through the reaction of octavinylsilsesquioxane (OVS) with different brominated pyrene (P-Br4), triphenylamine (TPA-Br3), and fluorene (F-Br2) as co-monomer units. The successful syntheses of both OVS-HPPs were tested using various instruments, such as X-ray photoelectron (XPS), solid-state 13C NMR, and Fourier transform infrared spectroscopy (FTIR) analyses. All spectroscopic data confirmed the successful incorporation and linkage of P, TPA, and F units into the POSS cage in order to form porous OVS-HPP materials. In addition, the thermogravimetric analysis (TGA) and N2 adsorption analyses revealed the thermal stabilities of OVS-P-F HPP (Td10 = 444 °C;char yield: 79 wt%), with a significant specific surface area of 375 m2 g–1 and a large pore volume of 0.69 cm3 g–1. According to electrochemical three-electrode performance, the OVS-P-F HPP precursor displayed superior capacitances of 292 F g−1 with a capacity retention of 99.8% compared to OVS-P-TPA HPP material. Interestingly, the OVS-P-TPA HPP showed a promising HER value of 701.9 µmol g−1 h−1, which is more than 12 times higher than that of OVS-P-F HPP (56.6 µmol g−1 h−1), based on photocatalytic experimental results. © 2022 by the authors.

关键词： Hydrogen production

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Diagnosis of pairing symmetry by vortex and edge spectra in kagome superconductors

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Physical Review B 2022年第17期105卷 174518-174518页

作者： Peize Ding Ching Hua Lee Xianxin Wu Ronny Thomale Institute for Theoretical Physics University of Würzburg Am Hubland D-97074 Würzburg Germany School of the Gifted Young University of Science and Technology of China Hefei 230026 China Department of Physics National University of Singapore Singapore 117542 Singapore Max-Planck-Institut für Festkörperforschung Heisenbergstrasse 1 D-70569 Stuttgart Germany CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

Layered kagome metals AV3Sb5 (A=K,Rb,Cs) exhibit diverse correlated electron phenomena. They include charge density wave formation and superconductivity, the pairing symmetry of which, however, is controversial due to contradictory experimental evidence. Through calculations based on real-space lattice models at the mean-field level, we investigate the vortex and surface spectra of all competitive pairing propensities suggested for AV3Sb5 from a weak-coupling analysis of unconventional superconductivity. Chiral p-wave pairing emerges as the only option to host Majorana bound states in the vortex core. We find chiral edge states for both p-wave and d-wave pairing, along with flat Andreev surface bound states for f-wave pairing. Our results expand the fingerprint of superconducting pairing and thus will contribute to resolving the nature of superconductivity in AV3Sb5.

关键词： Coherence length Density of states Edge states Electronic structure Fermi surface Multiband superconductivity Pairing mechanisms Spin-singlet pairing Spin-triplet pairing Superconducting gap Superconducting order parameter Topological materials Topological superconductors Vortices in superconductors Lattice models in condensed matter

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Observation of an unusual colossal anisotropic magnetoresistance effect in an antiferromagnetic semiconductor

arXiv

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arXiv 2021年

作者： Yang, Huali Liu, Qing Liao, Zhaoliang Si, Liang Jiang, Peiheng Liu, Xiaolei Guo, Yanfeng Yin, Junjie Wang, Meng Sheng, Zhigao Zhao, Yuxin Wang, Zhiming Zhong, Zhicheng Li, Run-Wei CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei230026 China School of Physical Science and Technology ShanghaiTech University Shanghai201210 China University of Chinese Academy of Sciences Beijing100049 China School of Physics Sun Yat-Sen University Guangzhou510275 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei230031 China National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Searching for novel antiferromagnetic materials with large magnetotransport response is highly demanded for constructing future spintronic devices with high stability, fast switching speed, and high density. Here we report a colossal anisotropic magnetoresistance effect in an antiferromagnetic binary compound with layered structure — rare-earth dichalcogenide EuTe2. The AMR reaches 40000%, which is 4 orders of magnitude larger than that in conventional antiferromagnetic alloys. Combined magnetization, resistivity, and theoretical analysis reveal that the colossal AMR effect is attributed to a novel mechanism of vector-field tunable band structure, rather than the conventional spin-orbit coupling mechanism. Moreover, it is revealed that the strong hybridization between orbitals of Eu-layer with localized spin and Te-layer with itinerant carriers is extremely important for the large AMR effect. Our results suggest a new direction towards exploring AFM materials with prominent magnetotransport properties, which creates an unprecedented opportunity for AFM spintronics applications. © 2021, CC BY.

关键词： Semiconductor insulator boundaries

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Resolving Galactic binaries using a network of space-borne gravitational wave detectors

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Physical Review D 2022年第10期106卷 102004-102004页

作者： Xue-Hao Zhang Shao-Dong Zhao Soumya D. Mohanty Yu-Xiao Liu Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province School of Physical Science and Technology Lanzhou University Lanzhou 730000 China Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University Lanzhou 730000 China Morningside Center of Mathematics Academy of Mathematics and System Science Chinese Academy of Sciences 55 Zhong Guan Cun Donglu Beijing 100190 China Department of Physics and Astronomy The University of Texas Rio Grande Valley One West University Blvd. Brownsville Texas 78520 USA

Extracting gravitational wave (GW) signals from individual Galactic binaries (GBs) against their self-generated confusion noise is a key data analysis challenge for space-borne detectors operating in the ≈0.1 to ≈10 mHz range. Given the likely prospect that there will be multiple such detectors, namely Laser Interferometer Space Antenna (LISA), Taiji, and Tianqin, with overlapping operational periods in the next decade, it is important to examine the extent to which the joint analysis of their data can benefit GB resolution and parameter estimation. To investigate this, we use realistic simulated LISA and Taiji data containing the set of 30×106 GBs used in the first LISA data challenge (Radler) and an iterative source extraction method called GBSIEVER introduced in an earlier work. We find that a coherent network analysis of LISA-Taiji data boosts the number of confirmed sources by ≈75% over that from a single detector. The residual after subtracting out the reported sources from the data of any one of the detectors is much closer to the confusion noise expected from an ideal, but infeasible, multisource resolution method that perfectly removes all sources above a given signal-to-noise ratio threshold. While parameter estimation for sources common to both the single detector and network improves broadly in line with the enhanced signal-to-noise ratio of GW sources in the latter, deviation from the scaling of error variance predicted by Fisher information analysis is observed for a subset of the parameters.

关键词： Gravitational wave detection Gravitational wave detectors

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Scalable Production of 2D Non-Layered Metal Oxides through Metal–Organic Gel Rapid Redox Transformation

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Angewandte Chemie 2024年第42期136卷

作者： Zhiyuan Liu Prof. Dong Wang Huazeng Yang Dr. Liu Feng Xin Xu Dr. Weimeng Si Dr. Yongzhao Hou Prof. Guangwu Wen Dr. Rui Zhang Prof. Jieshan Qiu School of Materials Science and Engineering Shandong University of Technology Zibo 255000 P. R. China These authors contributed equally to this work as the first authors. Shandong Silicon Nano New Material Technology Co. LTD Zibo 255000 P. R. China Analysis and Testing Center Shandong University of Technology Zibo 255000 P. R. China State Key Laboratory of Chemical Resource Engineering College of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 P. R. China

Two-dimensional (2D) nonlayered metal compounds with porous structure show broad application prospects in electrochemistry-related fields due to their abundant active sites, open ions/electrons diffusion channels, and faradaic reactions. However, scalable and universal synthesis of 2D porous compounds still remains challenging. Here, inspired by blowing gum, a metal-organic gel (MOG) rapid redox transformation (MRRT) strategy is proposed for the mass production of a wide variety of 2D porous metal oxides. Adequate crosslinking degree of MOG precursor and its rapid redox with NO 3 − are critical for generating gas pressure from interior to exterior, thus blowing the MOG into 2D carbon nanosheets, which further act as self-sacrifice template for formation of oxides with porous and ultrathin structure. The versatility of this strategy is demonstrated by the fabrication of 39 metal oxides, including 10 transition metal oxides, one II-main group oxide, two III-main group oxides, 22 perovskite oxides, four high-entropy oxides. As an illustrative verification, the 2D transition metal oxides exhibit excellent capacitive deionization (CDI) performance. Moreover, the assembled CDI cell could act as desalting battery to supply electrical energy during electrode regeneration. This MRRT strategy offers opportunities for achieving universal synthesis of 2D porous oxides with nonlayered structures and studying their electrochemistry-related applications.

关键词： 2D porous metal oxides Metal-organic gel Redox Capacitive deionization

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DNA pom-pom nanostructure as a multifunctional platform for pathogenic bacteria determination and inactivation

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Biosensors and Bioelectronics 2021年 177卷 112982页

作者： Zeng, Yan Qi, Peng Wang, Yingwen Chen, Chao Zhang, Dun Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of Oceanology Chinese Academy of Sciences 7 Nanhai Road Qingdao266071 China Open Studio for Marine Corrosion and Protection Qingdao National Laboratory for Marine Science and Technology 1 Wenhai Road Qingdao266237 China Center for Ocean Mega-Science Chinese Academy of Sciences 7 Nanhai Road Qingdao266071 China University of the Chinese Academy of Sciences Beijing100039 China

Pathogenic bacteria levels are significantly related with disease control, clinical diagnosis, and even environmental monitoring. It is becoming highly urgent to achieve ultrasensitive detection of pathogenic bacteria and efficient combat of bacterial infection. Toward this end, we have assembled a DNA Pom-Pom nanostructure (PP–N) based multifunctional platform for pathogenic bacteria determination and inactivation. In particular, one DNA oligonucleotide probe that serve as a trigger was specifically designed for the autonomous cross-opening of metastable DNA hairpin probes and long dsDNA structure formation, achieving a catalytic self-assembly of DNA nanostructure. Numerous DNA strands in this PP-N assembly provide sufficient interaction sites for functional domains and connector, showing high programmability, excellent biostability, as well as selective target recognition. With these properties, the fluorescence dyes modified PP-N platform showed excellent bacteria analysis with both excellent selectivity and ultrasensitive determination limit as low as 2.0 CFU/mL. Furthermore, the aptamer-functionalized and antibiotics loaded PP-N platform demonstrate excellent merits of high antibiotics-loading capacity and negligible cytotoxicity to targets. Therefore, this DNA PP-N assembly based multifunctional platform promise its great application in targeted sensing, combating bacterial infection, and potential clinic therapy. © 2021 Elsevier B.V.

关键词： Antibiotics

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Fabrication of Polyaniline/Poly(Vinyl Alcohol)/Montmorillonite Hybrid Aerogels Toward Efficient Adsorption of Organic Dye Pollutants

SSRN

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SSRN 2022年

作者： Lyu, Wei Trchová, Miroslava Wang, Guang Li, Jiaqiang Liao, Yaozu Bober, Patrycja Stejskal, Jaroslav State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai21620 China Institute of Macromolecular Chemistry Czech Academy of Sciences Prague 6162 06 Czech Republic University of Chemistry and Technology Prague Prague 6166 28 Czech Republic Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Spallation Neutron Source Science Centre Dongguan523803 China

Three-dimensional (3D) polyaniline/poly(vinyl alcohol)/montmorillonite (PANI/PVAL/MMT) hybrid aerogels with easy separation performance were fabricated by a simple in-situ polymerization method for the removal of organic dye pollutants. The incorporation of MMT particles into aerogel matrix was successfully proven by the energy dispersive spectra mapping and small and wide-angle X-ray scattering. A well-defined hierarchical structure where PANI nanofibers coated on the skeleton wall can be observed for PANI/PVAL/MMT exhibiting the highest specific surface area when the incorporation amount of MMT was around 11.1 wt%. The adsorption performance of as-prepared hybrid aerogels on both anionic and cationic dyes was systemically investigated. While PANI/PVAL efficiently adsorbed anionic dyes, MMT was an efficient adsorbent of cationic ones. The data analysis showed that the adsorption process for PVAL/PANI/MMT aerogel for Reactive Black 5 (RB5), methyl orange (MO) and safranin followed Freundlich isotherm model and the maximum experimental adsorption capacities were found to be 199.8, 251.3 and 57.0 mg g −1 at 25 °C, respectively. Mechanism studies indicated that the electrostatic interaction is the main driving force for the adsorption of dyes. The results demonstrated that the fabricated hybrid aerogel is an efficient adsorbent for the removal of both anionic and cationic organic dyes. © 2022, The Authors. All rights reserved.

关键词： Aerogels

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Automatic Sleep Spindle Detection and analysis in Patients with Sleep Disorders 1

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2nd International Workshop on Human Brain and Artificial Intelligence, HBAI 2020 held in Conjunction with IJCAI-PRICAI 2020

作者： Chen, Chao Zhu, Xuequan Belkacem, Abdelkader Nasreddine Lu, Lin Hao, Long You, Jia Shin, Duk Tan, Wenjun Huang, Zhaoyang Ming, Dong Academy of Medical Engineering and Translational Medicine Tianjin University Tianjin300072 China Key Laboratory of Complex System Control Theory and Application Tianjin University of Technology Tianjin300384 China Department of Computer and Network Engineering College of Information Technology UAE University Al Ain15551 United Arab Emirates Zhonghuan Information College Tianjin University of Technology Tianjin300380 China Department of Electronics and Mechatronics Tokyo Polytechnic University Atsugi243-0297 Japan School of Computer Science and Engineering Northeastern University Shenyang110189 China Department of Neurology Xuanwu Hospital Capital Medical University Beijing100088 China

ISBN: (数字)9789811612886

ISBN: (纸本)9789811612879

Nowadays, Sleep disorder is a common disease, and spindle spindles are important features of the second stage non-rapid eye movement (NREM) sleep. In this paper, we propose an improved automatic detection method of spindles based on wavelet transform. The spindles automatic detector is mainly composed of wavelet transform and clustering. We collected the electroencephalography (EEG) signals of six patients with sleep disorders all night for ten hours, and then preprocessed the data and other operations, and then used our improved method to detect the sleep EEG signals by spindles. By comparing with the previous automatic detection method not improved and another automatic detection method, the results show that the accuracy of sleep spindles detection can be effectively improved. The accuracy of the improved detector is 5.19% higher than before, and 9.7% higher than that of another method based on amplitude threshold. Finally, we made a simple comparison between people with sleep disorders and normal people. We found that there were significant differences in spindle density between people with sleep disorders and people without sleep disorders. The average spindle density in the normal population averaged 2.59 spindles per minute. People with sleep disorders had an average spindle density of 1.32 spindles per minute. In future research, our research direction is to improve the accuracy of spindles automatic detection by improving the spindles detector and study the difference of spindles between patients with sleep disorders and normal people in a large number of samples, so that the difference of spindles can be used as the basis for the diagnosis of sleep disorders. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Wavelet transforms

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