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Semi-supervised gear fault diagnosis using raw vibration signal based on deep learning

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Chinese Journal of Aeronautics 2020年第2期33卷 418-426页

作者： Xueyi LI jialin LI Yongzhi QU David HE School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China School of Mechanical and Electronic Engineering Wuhan University of TechnologyWuhan 430070China Department of Mechanical and Industrial Engineering University of Illinois at ChicagoChicago IL 60607USA

In aerospace industry,gears are the most common parts of a mechanical transmission *** pitting faults could cause the transmission system to crash and give rise to safety *** is always a challenging problem to diagnose the gear pitting condition directly through the raw signal of *** this paper,a novel method named augmented deep sparse autoencoder(ADSAE)is *** method can be used to diagnose the gear pitting fault with relatively few raw vibration signal *** method is mainly based on the theory of pitting fault diagnosis and creatively combines with both data augmentation ideology and the deep sparse autoencoder algorithm for the fault diagnosis of gear *** effectiveness of the proposed method is validated by experiments of six types of gear pitting *** results show that the ADSAE method can effectively increase the network generalization ability and robustness with very high *** method can effectively diagnose different gear pitting conditions and show the obvious trend according to the severity of gear wear *** results obtained by the ADSAE method proposed in this paper are compared with those obtained by other common deep learning *** paper provides an important insight into the field of gear fault diagnosis based on deep learning and has a potential practical application value.

关键词： Deep learning Gear pitting diagnosis Gear teeth Raw vibration signal Semi-supervised learning Sparse autoencoder

Shape/size controlling syntheses, properties and applications of two-dimensional noble metal nanocrystals

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Frontiers of Chemical Science and Engineering 2016年第3期10卷 360-382页

作者： Baozhen An Mingjie Li jialin Wang Chaoxu Li Bioengineering Department College of Chemical Engineering Qingdao University of Science & Technology Qingdao 266042 China CAS Key Laboratory of Bio-based Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China

Two dimensional （2D） nanocrystals of noble metals （e.g., Au, Ag, Pt） often have unique structural and environmental properties which make them useful for applications in electronics, optics, sensors and biomedi- cines. In recent years, there has been a focus on discovering the fundamental mechanisms which govern the synthesis of the diverse geometries of these 2D metal nanocrystals （e.g., shapes, thickness, and lateral sizes）. This has resulted in being able to better control the properties of these 2D structures for specific applications. In this review, a brief historical survey of the intrinsic anisotropic properties and quantum size effects of 2D noble metal nanocrystals is given and then a summary of synthetic approaches to control their shapes and sizes is presented. The unique properties and fascinating applica- tions of these nanocrystals are also discussed.

关键词： two-dimension noble metal nanocrystal surface plasmon controllable synthesis

Four-Parameter Signal Decomposition and Related Adaptive Time-Frequency Distribution

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Journal of Systems Engineering and Electronics 2000年第3期11卷 14-21页

作者： Ma, Shiwei Deng, Jiamei Cao, jialin Shanghai Univ Shanghai China

We propose a four-parameter adaptive signal decomposition method and related adaptive time-frequency distribution, which is positive, cross-term interference-free energy distribution and yields better time and frequency resolution. The elementary functions are dilations, translations, rotations and modulations of single Gaussian window function, which are obtained by successively matching the signal local natures. So the coefficients and parameters, obtained from the decomposition process, can provide an interpretation of signal structure and can be used for the analysis and synthesis of signals.

关键词： Free energy Modulation Signal interference

Enlisting a Traditional Chinese Medicine to tune the gelation kinetics of a bioactive tissue adhesive for fast hemostasis or minimally invasive therapy

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Bioactive Materials 2021年第3期6卷 905-917页

作者： Haoqi Tan Dawei Jin Junjie Sun jialin Song Yao Lu meng Yin Xin Chen Xue Qu Changsheng Liu Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Material Science and EngineeringEast China University of Science and TechnologyShanghai200237China Department of Cardiothoracic Surgery Shanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong University1678 Dong Fang RoadShanghai200127China

Gelation kinetics is important in tailoring chemically crosslinked hydrogel-based injectable adhesives for different ***,the regulation of gelation rate is usually limited to varying the gel precursor and/or crosslinker concentration,which cannot reach a fine level and inevitably alters the physical properties of *** reactions are widely used to synthesize hydrogel *** this work,we propose a traditional Chinese medicine(Borax)-input strategy to tune the gelation rate of amidation reaction triggered *** provides an initial basic buffer environment to promote the deprotonation process of amino groups and accelerate this *** using a tissue adhesive model PEG-lysozyme(PEG-LZM),the gelation time can be modulated from seconds to minutes with varying Borax concentrations,while the physical properties remain ***,the antibacterial ability can be improved due to the bioactivity of *** hydrogel precursors can be regulated to solidify instantly to close the bleeding wound at ***,they can also be customized to match the flowing time in the catheter,thereby facilitating minimally invasive tissue *** this method is easily operated,we envision Borax adjusted amidation-type hydrogel has a promising prospect in clinical application.

关键词： Injectable tissue adhesive Gelation time Borax Rapid hemostasis Minimally invasive delivery

Role of Intracellular Distribution of Feline and Bovine SAMHD1 Proteins in Lentiviral Restriction

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Virologica Sinica 2021年第5期36卷 981-996页

作者： Chu Wang Lina meng jialin Wang Kaikai Zhang Sizhu Duan Pengyu Ren Yingzhe Wei Xinyu Fu Bin Yu Jiaxin Wu Xianghui Yu National Engineering Laboratory for AIDS Vaccine School of Life SciencesJilin UniversityChangchun 130012China The First Hospital and Institute of Immunology Jilin UniversityChangchun 130012China Key Laboratory for Molecular Enzymology and Engineering the Ministry of EducationSchool of Life SciencesJilin UniversityChangchun 130012China

Human SAMHD1(h SAM)restricts lentiviruses at the reverse transcription step through its d NTP triphosphohydrolase(d NTPase)*** humans,several mammalian species such as cats and cows that carry their own lentiviruses also express ***,the intracellular distribution of feline and bovine SAMHD1(f SAM and b SAM)and its significance in their lentiviral restriction function is not ***,we demonstrated that f SAM and b SAM were both predominantly localized to the nucleus and nuclear localization signal(11KRPR14)-deleted f SAM and b SAM relocalized to the *** cytoplasmic f SAM and b SAM retained the antiviral function against different lentiviruses and cytoplasmic f SAM could restrict Vpx-encoding SIV and HIV-2 more efficiently than its wild-type(WT)protein as cytoplasmic h *** investigation revealed that cytoplasmic f SAM was resistant to Vpx-induced degradation like cytoplasmic h SAM,while cytoplasmic b SAM was not,but they all demonstrated the same in vitro d NTPase activity and all could interact with Vpx as their WT proteins,indicating that cytoplasmic h SAM and f SAM can suppress more SIV and HIV-2 by being less sensitive to Vpx-mediated *** results suggested that f SAM-and b SAM-mediated lentiviral restriction does not require their nuclear localization and that f SAM shares more common features with h *** findings may provide insights for the establishment of alternative animal models to study SAMHD1 in vivo.

关键词： SAMHD1 Feline SAMHD1(fSAM) Bovine SAMHD1(bSAM) Nuclear localization signal(NLS) Vpx Degradation Viral restriction

A Robust on-Wafer Large Signal Transistor Characterization Method at mm-Wave Frequency

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Chinese Journal of Electronics 2019年第4期28卷 871-877页

作者： SU Jiangtao CAI jialin ZHENG Xing SUN Lingling Key Laboratory of RF Circuits and Systems Ministry of Education

Accurate on-wafer large signal characterization of RF transistor is crucial for the optimum design of wireless communication circuits. We report a novel and systematic measurement method for the accurate acquisition of input and output power of on-wafer transistors up to 40 GHz. This method employs external couplers to extract the travelling waves, combined with a novel large signal calibration algorithm to calculate the power at on-wafer probe tip. The accuracy of this method was bench marked versus conventional approaches in a real measurement bench, and further been verified by characterizing the large signal response of a 0.25μm GaN HEMT device. It is concluded that the measurement uncertainty has been greatly decreased with this new method, especially at mm-wave frequencies.

关键词： Calibration Nonlinear measurement RF power amplifier mm-wave band On-wafer test

A fiber optic sensor for detecting and monitoring cracks in concrete structures

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Science China(Technological Sciences) 2010年第11期53卷 3045-3050页

作者： BAO TengFei WANG jialin YAO Yuan State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210024China National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai UniversityNanjing 210024China

The formation and propagation of cracks reflect the aging and pathologic changes of concrete structures and may cause problems such as seepage and long-term durability. Crack detection and monitoring is therefore an effective way to evaluate structural health conditions. An important challenge in such a task is that the locations and orientations of cracks in concrete structures are difficult to predict due to material inhomogeneity and complexity. The number of the required conventional electric and electromagnetic sensors to cover all possible cracks may be too large to be practical for a monitoring scheme. In this paper, a fiber optic sensor with distributed crack sensing capability based on optical time domain reflectometry is proposed and its sensing principle is introduced. Experiments are conducted to obtain the optical power loss versus crack opening at different fiber inclination angles, and then a model is developed to quantify it. Finally, an experiment is performed to demonstrate the practical application of the sensor. The test results show that detecting and monitoring cracks with the sensor do not require a-priori knowledge of crack locations and orientations.

关键词： fiber optic sensor crack concrete

Emerging interactively stretchable electronics with optical and electrical dual-signal feedbacks based on structural color materials

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Nano Research 2024年第3期17卷 1837-1855页

作者： jialin Wang Kai Zhao Changqing Ye Yanlin Song School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijing 100190China

The booming development of wearable devices has aroused increasing interests in flexible and stretchable *** mechanosensory functionality,these devices are highly desirable on account of their wide range of applications in electronic skin,personal healthcare,human–machine interfaces and ***,they are mostly limited by single electrical signal feedback,restricting their diverse applications in visualized mechanical *** by the mechanochromism of structural color materials,interactively stretchable electronics with optical and electrical dual-signal feedbacks are recently emerged as novel sensory platforms,by combining both of their sensing mechanisms and ***,recent studies on interactively stretchable electronics based on structural color materials are *** a brief introduction of their basic components(i.e.,stretchable electronics and mechanochromic structural color materials),two types of interactively stretchable electronics with respect to the nanostructures of mechanochromic materials are outlined,focusing primarily on their design considerations and fabrication ***,the main challenges and future perspectives of these emerging devices are discussed.

关键词： stretchable electronics structural color materials interactive sensing mechanochromism dual-signal feedbacks

Learning to optimize:A tutorial for continuous and mixed-integer optimization

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Science China Mathematics 2024年第6期67卷 1191-1262页

作者： Xiaohan Chen jialin Liu Wotao Yin Decision Intelligence Lab Alibaba DAMO AcademyBellevueWA98004USA

Learning to optimize(L2O)stands at the intersection of traditional optimization and machine learning,utilizing the capabilities of machine learning to enhance conventional optimization *** real-world optimization problems frequently share common structures,L2O provides a tool to exploit these structures for better or faster *** tutorial dives deep into L2O techniques,introducing how to accelerate optimization algorithms,promptly estimate the solutions,or even reshape the optimization problem itself,making it more adaptive to real-world *** considering the prerequisites for successful applications of L2O and the structure of the optimization problems at hand,this tutorial provides a comprehensive guide for practitioners and researchers alike.

关键词： AI for mathematics(AI4Math) learning to optimize algorithm unrolling plug-and-play methods differentiable programming machine learning for combinatorial optimization(ML4CO)