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Non-probabilistic information fusion technique for structural damage identification based on measured dynamic data with uncertainty

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Acta Mechanica Sinica 2013年第2期29卷 202-210页

作者： xiao-jun wang Chen Yang Zhi-Ping Qiu Institute of Solid Mechanics Beihang University

Based on measured natural frequencies and acceleration responses,a non-probabilistic information fusion technique is proposed for the structural damage detection by adopting the set-membership identification（SMI） and twostep model updating *** to the insufficiency and uncertainty of information obtained from measurements,the uncertain problem of damage identification is addressed with interval variables in this *** on the first-order Taylor series expansion,the interval bounds of the elemental stiffness parameters in undamaged and damaged models are estimated,*** possibility of damage existence（PoDE） in elements is proposed as the quantitative measure of structural damage probability,which is more reasonable in the condition of insufficient measurement *** comparison with the identification method based on a single kind of information,the SMI method will improve the accuracy in damage identification,which reflects the information fusion concept based on the non-probabilistic set.A numerical example is performed to demonstrate the feasibility and effectiveness of the proposed technique.

关键词： Damage identification·Information fusion technique·Set-membership identification(SMI)·Uncertainty·Interval analysis method

Effect of detrapping on up-conversion charging in LaMgGa_(11)O_(19):Pr^(3+) persistent phosphor

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Journal of Rare Earths 2021年第12期39卷 1492-1496,I0002页

作者： Xiyu Zhao Chenlin Li Feng Liu xiao-jun wang Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchun 130024China Department of Physics Georgia Southern UniversityStatesboroGA30460USA

Up-conversion charging(UCC)is a promising approach for charging storage phosphors using low-energy excitation light *** further understanding the UCC,research on the competition between trapping and detrapping during illumination is essentially *** we demonstrate the effect of detrapping on UCC dynamics by a rate equation ***,taking LaMgGa_(11)O_(19):Pr^(^(3+))phosphor as an example,we experimentally verified the dependence of illumination dose and duration on the thermoluminescence intensities using 450 nm laser *** present model and experimental approach appear to be transferable to other phosphors,Thus,many existing persistent phosphors can now be revisited,paving the way toward advancing the understanding of UCC.

关键词： Up-conversion charging Pr^(3+)ion Detrapping Rate equation Thermolumineseence Rare earths

Strategies to approach high performance in Cr^(3+)-doped phosphors for high-power NIR-LED light sources

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Light(Science & Applications) 2020年第1期9卷 1190-1198页

作者： Zhenwei Jia Chenxu Yuan Yongfu Liu xiao-jun wang Peng Sun Lei wang Haochuan Jiang jun Jiang Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 315201China College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan 030024China University of Chinese Academy of Sciences Beijing 100049China Department of Physics Georgia Southern UniversityStateboreGA 30460USA

Broadband near-infrared(NIR)-emitting phosphors are key for next-generation smart NIR light sources based on blue *** achieve excellent NIR phosphors,we propose a strategy of enhancing the crystallinity,modifying the micromorphology,and maintaining the valence state of Cr^(3+) in Ca_(3)Sc_(2)Si_(3)O_(12) garnet(CSSG).By adding fluxes and sintering in a reducing atmosphere,the internal quantum efficiency(IQE)is greatly enhanced to 92.3%.The optimized CSSG:6% Cr^(3+) exhibits excellent thermal *** 150℃,97.4% of the NIR emission at room temperature can be *** fabricated NIR-LED device emits a high optical power of 109.9mW at 520 *** performances of both the achieved phosphor and the NIR-LED are almost the best results until *** mechanism for the optimization is *** application of the NIR-LED light source is demonstrated.

关键词： phosphors power light

Recent Research on the Deformation Behavior of Particle Reinforced Magnesium Matrix Composite: A Review

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Acta Metallurgica Sinica(English Letters) 2019年第4期32卷 413-425页

作者： Kun-Kun Deng Cui-Ju wang Kai-Bo Nie xiao-jun wang Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and Engineering Taiyuan University of Technology School of Materials Science and Engineering Harbin Institute of Technology

Particle reinforced magnesium matrix composite(PMMC) possesses the merits of high specific strength, high specific modulus, better dimensional stability, good wear resistance and lower production cost, which is thought as a promising material in the field of aerospace, automobile, electronic communication, etc. To eliminate the casting defect, the PMMC is usually experienced hot deformation process. The present paper mainly focuses on the deformation behavior of PMMCs. First, the development of PMMCs based on particle size is introduced. Then, the hot deformation technology and deformation mechanism of PMMCs at elevated temperature are given and analyzed, respectively. After reviewing the dynamic recrystallization and texture of PMMCs, its future development is suggested based on the current research progress.

关键词： Magnesium matrix composite Particle Hot deformation Deformation mechanism Recrystallization

Fabrication,microstructure and mechanical properties of Mg matrix composites reinforced by high volume fraction of sphere TC4 particles

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Journal of Magnesium and Alloys 2016年第4期4卷 286-294页

作者： Chun-Lei Zhang xiao-jun wang xiao-Ming wang xiao-Shi Hu Kun Wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbinChina

A novel liquid settling method was investigated and applied to fabricate TC4 spherical particle reinforced AZ91 alloy matrix *** method was called liquid state settling technique in which TC4 particles would settle down under the force of *** volume fraction(50%)particle reinforced AZ91 composites could be easily obtained via this novel *** is difficult to achieve for other traditional liquid fabrication *** addition,there was a good dispersion of TC4 particles in the AZ91 matrix and no clusters were found,which indicate that this method was *** reaction occurred and the reaction product was confirmed to be *** kinds of pre-dispersion technologies were used before the settling process and different interfacial microstructures were *** calculation and experimental results both indicated that the interfacial product which was embedded in the matrix strengthened the composites and improved the tensile strength.

关键词： Magnesium matrix composites TC4 particles Fabrication processing Interfacial reaction

Probing recycled carbonate in the lower mantle

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National Science Review 2022年第6期9卷 10-11页

作者： Li-Hui Chen xiao-jun wang Sheng-Ao Liu Department of Geology State Key Laboratory of Continental Dynamics Northwest University State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

Carbonates in marine sediments and altered oceanic crust are major carbon reservoirs on Earth’s surface, which can be transported into Earth’s interior by subduction. High-pressure experiments and thermodynamic mode...

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Combination of neutrophil gelatinase-associated lipocalin and matrix metalloproteinase-9 are biomarkers for the detection of colon tubular adenocarcinoma

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World Journal of Gastrointestinal Oncology 2021年第10期13卷 1506-1517页

作者： jun-Hua Yuan Li-Shuang Xie Yu-Hua Zhu xiao-Hua wang Yi-Jing Zhang xiao-jun wang Department of Geriatric Gastroenterology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina Medical Records Room Yinan County People’s HospitalYinan 276399Shandong ProvinceChina Department of Infectious Diseases Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina Department of Infectious Diseases and Liver Diseases Jinan Infectious Disease HospitalShandong University School of MedicineJinan 250021Shandong ProvinceChina

BACKGROUND Tubular adenocarcinoma of the colon,which originates from the epithelium of the glands,is a major health concern ***,it is difficult to detect at an early *** lack of biomarkers is a main barrier to the diagnosis and treatment of tubular *** gelatinase-associated lipocalin(NGAL)is a secreted protein that induces the expression of matrix metalloproteinase-9(MMP-9)and is involved in various *** and MMP-9 have been reported to be associated with tumorigenesis and *** may have potential as biomarkers for diagnosis of tubular adenocarcinoma of the *** To determine whether NGAL and MMP-9 can be used as potential biomarkers to indicate the progression of tubular adenocarcinoma of the *** Samples were collected from surgically excised tissue from various *** content of pro-gastrin-releasing peptide(pro-GRP)in the serum was measured by an electrochemiluminescence *** expression patterns of NGAL and MMP-9 and the relationship between NGAL and MMP-9 were examined by quantitative real-time PCR,Western blotting and immunohistochemical *** In this study,we found that NGAL and MMP-9 can be used as biomarkers for the detection of tubular adenocarcinoma of the colon and that their combination improved diagnostic *** analyzing the expression of NGAL in tubular adenocarcinoma at different levels,we found that NGAL expression was significantly upregulated in primary tubular adenocarcinoma tissues compared with normal *** upregulation of NGAL expression was strongly correlated with both the degree of differentiation and the disease stage(I–III),indicating that NGAL could serve as a diagnostic biomarker for tubular *** using NGAL as a biomarker for diagnosis,the accuracy was similar to that achieved with the widely used biomarker pro-GRP,suggesting that NGAL is ***,the expression of MMP-9 was also strongly correlated wit

关键词： Tubular adenocarcinoma Colon Neutrophil gelatinase-associated lipocalin Matrix metalloproteinase-9 Biomarker

Optimum design of hierarchical stiffened shells for low imperfection sensitivity

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Acta Mechanica Sinica 2014年第3期30卷 391-402页

作者： Bo wang Peng Hao Gang Li Jia-Xin Zhang Kai-Fan Du Kuo Tian xiao-jun wang xiao-Han Tang State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of Technology Beijing Institute of Astronautical Systems Engineering

A concept of hierarchical stiffened shell is proposed in this study, aiming at reducing the imperfection sen- sitivity without adding additional weight. Hierarchical stiffened shell is composed of major stiffeners and minor stiff- eners, and the minor stiffeners are generally distributed between adjacent major stiffeners. For various types of geo- metric imperfections, e.g., eigenmode-shape imperfections, hierarchical stiffened shell shows significantly low imper- fection sensitivity compared to traditional stiffened shell. Furthermore, a surrogate-based optimization framework is proposed to search for the hierarchical optimum design. Then, two optimum designs based on two different opti- mization objectives （including the critical buckling load and the weighted sum of collapse loads of geometrically imperfect shells with small- and large-amplitude imperfections） are compared and discussed in detail. The illustrative example demonstrates the inherent superiority of hierarchical stiffened shells in resisting imperfections and the effectiveness of the proposed framework. Moreover, the decrease of imperfection sensitivity can finally be converted into a decrease of structural weight, which is particularly important in the development of large-diameter launch vehicles.

关键词： Hierarchical stiffened shell Imperfection sensi-tivity Collapse Optimization

Deep-trap ultraviolet persistent phosphor for advanced optical storage application in bright environments

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Light(Science & Applications) 2024年第11期13卷 2634-2648页

作者： Xulong Lv Yanjie Liang Yi Zhang Dongxun Chen Xihui Shan xiao-jun wang Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Shandong UniversityJinan 250061China Department of Physics Georgia Southern UniversityStatesboroGA 30460USA

Extensive research has been conducted on visible-light and longer-wavelength infrared-light storage phosphors,which are utilized as promising rewritable memory media for optical information storage applications in dark ***,storage phosphors emitting in the deep ultraviolet spectral region(200–300 nm)are relatively ***,we report an appealing deep-trap ultraviolet storage phosphor,ScBO_(3):Bi^(3+),which exhibits an ultranarrowband light emission centered at 299 nm with a full width at half maximum(FWHM)of 0.21 eV and excellent X-ray energy storage *** persistently stimulated by longer-wavelength white/NIR light or heated at elevated temperatures,ScBO_(3):Bi^(3+)phosphor exhibits intense and long-lasting ultraviolet luminescence due to the interplay between defect levels and external stimulus,while the natural decay in the dark at room temperature is extremely weak after X-ray *** impact of the spectral distribution and illuminance of ambient light and ambient temperature on ultraviolet light emission has been studied by comprehensive experimental and theoretical investigations,which elucidate that both O vacancy and Sc interstitial serve as deep electron traps for enhanced and prolonged ultraviolet luminescence upon continuous optical or thermal *** on the unique spectral features and trap distribution in ScBO_(3):Bi^(3+)phosphor,controllable optical information read-out is demonstrated via external light or heat manipulation,highlighting the great potential of ScBO_(3):Bi^(3+)phosphor for advanced optical storage application in bright environments.

关键词： ultraviolet ambient luminescence