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Comprehensive damage evaluation of localized spallation of thermal barrier coatings

Journal of Advanced Ceramics 2017年第3期6卷 230-239页

作者： Wei-Wei zhang guang-Rong LI Qiang zhang guan-jun YANGa State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 ChinaInstitute of Publication Science Chang'an University Xi'an 710064 ChinaSchool of Materials Science and Engineering Chang'an University Xi'an 710064 China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 ChinaAECC Beijing Institute of Aeronautical Material Beijing 100095 China

Thermal barrier coatings (TBCs) enable the hot section part to work at high temperatures owing to their thermal barrier effect on the base metal components. However, localized spallation in the ceramic top-coat might occur after long duration of thermal exposure or thermal cycling. To comprehensively understand the damage of the top-coat on the overall hot section part, effects of diameter and tilt angle of the spallation on the temperature redistribution of the substrate and the top-coat were investigated. The results show that the spallation diameter and tilt angle both have a significant effect on the temperature redistribution of the top-coat and the substrate. In the case of the substrate, the maximum temperature increment is located at the spallation center. Meanwhile, the surface (depth) maximum temperature increment, having nothing to do with the tilt angle, increases with the increase of the spallation diameter. In contrast, in the case of the top-coat, the maximum temperature increment was located at the sharp corner of the spallation area, and the surface (depth) maximum temperature increment increases with the increase of both the spallation diameter and the tilt angle. Based on the temperature redistribution of the substrate and the top-coat affected by the partial spallation, it is possible to evaluate the damage effect of spalled areas on the thermal capability of TBCs.

关键词： thermal barrier coatings (TBCs) thermal property localized spallation damage evaluation

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Long-Range Interaction Enhanced Adiabatic Quantum Computers

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Chinese Physics Letters 2020年第12期37卷 1-5页

作者： Anqi Shi Haoyu guan jun zhang Wenxian zhang School of Physics and Technology Wuhan UniversityWuhan 430072China

A quantum computer is not necessarily alone,e.g.,thousands and millions of quantum computers are simultaneously working together for adiabatic quantum computers based on nuclear ***-range interaction is inevitable between these nuclear spin *** we investigate the effect of long-range dipolar interaction between different adiabatic quantum *** analytical and numerical results show that the dipolar interaction can enhance the final fidelity in adiabatic quantum computation for solving the factorization problem,when the overall interaction is *** enhancement will become more prominent if a single quantum computer encounters an extremely small energy gap which occurs more likely for larger-size systems.

关键词： quantum adiabatic interaction

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Integrating lipidomics and gut microbiota to study the anti-hyperlipidemia effect of Sargentodoxae Caulis extract

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Traditional Medicine Research 2025年第1期10卷 1-11页

作者： Xiao-Xiao zhang Li Jia Xiu-jun Zhan Charity Ngina Qing-Rui zhang Xiao-Ge Li Qi-Bao Jiang Shi Bai Miao-Miao Jiang National Key Laboratory of Chinese Medicine Modernization Tianjin University of Traditional Chinese MedicineTianjin 301617China Haihe Laboratory of Modern Chinese Medicine Tianjin 301617China School of Medicine Taizhou UniversityTaizhou 318000China.

Background:Sargentodoxae Caulis(SC)is the vine stem of Sargentodoxa Cuneata(Oliv.)Rehd.&*** in ***,and it in traditional Chinese medicine has been known for promoting blood circulation and removing blood stasis as recorded in the ancient book“Illustrated Classics of Materia Medica”.It has been used effectively to treat blood stasis too in modern clinical ***,the anti-hyperlipidemia effect of SC is not fully *** paper aims at exploring the use of SC stems to improve the balance of blood lipids in the body,and its new role in treating ***:The effects of SC extract on hyperlipidemia were explored by combining lipidomics and gut ***,we explored the potential mechanism of SC in treating hyperlipidemia by pathway ***:The results showed that the stem extract of SC could restore the physiological and biochemical indices of hyperlipidemia in mice,as well as repair the morphological and structural damage to *** to the Model group,the SC extract significantly reduced the liver index,epididymal fat index,and Lee’s *** also significantly decreased serum levels of total cholesterol,triglycerides,low-density lipoprotein cholesterol,peroxisome proliferator-activated receptor gamma(PPAR-γ),D-lactate,and free fatty acids,while significantly increasing the relative content of peroxisome proliferator-activated receptor alpha(PPAR-α).These changes were statistically ***-targeted lipidomics,based on LC-MS,were utilized to investigate the lipid metabolism characteristics in serum,liver,and epididymal fat of the *** was observed that,compared to the blank group,the Model group exhibited significant changes primarily in glycerol lipids and *** treatment group also displayed alterations in these lipids.A total of 38,81,and 27 differential lipids were identified in serum,liver,and epididymal fat samples,*** these,14 common differenti

关键词： hyperlipidemia Sargentodoxae Caulis lipidomics intestinal flora

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A Field Study on Effects of Nitrogen Fertilization Modes on Nutrient Uptake,Crop Yield and Soil Biological Properties in Rice-Wheat Rotation System

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Agricultural Sciences in China 2011年第8期10卷 1254-1261页

作者： guan guan TU Shu-xin YANG jun-cheng zhang Jian-feng YANG Li College of Resource and Environment Huazhong Agricultural UniversityWuhan 430070P.R.China Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Institute of Plant Protection and Soil Fertilizer Hubei Academy of Agricultural SciencesWuhan 430064P.R.China

Rational application of nitrogen （N） fertilizers is an important measure to raise N fertilizer recovery rate and reduce N loss.A two-year field experiment of rice-wheat rotation was employed to study the effects of N fertilization modes including a N fertilizer reduction and an organic manure replacement on crop yield,nutrient uptake,soil enzyme activity,and number of microbes as well as diversity of *** result showed that 20% reduction of traditional N fertilizer dose of local farmers did not significantly change crop yield,N uptake,soil enzyme activity,and the number of microbes （bacteria,actinomycetes,and fungi）.On the basis of 20% reduction of N fertilizer,50% replacement of N fertilizer by organic manure increased the activity of sucrose,protease,urease,and phosphatase by 46-62,27-89,33-46,and 35-74%,respectively,and the number of microbes,i.e.,bacteria,actinomycetes,and fungi by 36-150,11-153,and 43-56%,***,organic fertilizer replacement had a Shannon＇s diversity index （H） of 2.18,which was higher than that of other modes of single N fertilizer *** results suggested that reducing N fertilizer by 20% and applying organic manure in the experimental areas could effectively lower the production costs and significantly improve soil fertility and biological properties.

关键词： rice-wheat rotation N fertilization mode organic manure replacement soil enzyme activity microbial diversity

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Effects of impurity elements on SiC grain boundary stability and corrosion

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Nuclear Science and Techniques 2021年第11期32卷 77-95页

作者： jun Hui Bao-Liang zhang Tao Liu Min Liu Wen-guan Liu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China China Institute of Atomic Energy Beijing 102413China

Grain boundaries(GBs)have critical influences on the stability and properties of various *** this study,first-principles calculations were performed to determine the effects of four metallic impurities(Ni,Al,Bi,and Pb)and three nonmetallic impurities(H,O,and N)on the GBs of silicon carbide(SiC),using the ∑5(210)GBs as *** GB energy and segregation energy(SE)were calculated to identify the effects of impurities on the GB *** interactions considerably influenced the bonding effects of *** formation of weak bonds resulted in the corrosion and embrittlement of *** co-segregation of Bi,Pb,and O was also investigated in detail.

关键词： SiC First-principles calculation Grain boundary Impurity atom Co-segregation

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Hard-rock tunnel lithology identification using multiscale dilated convolutional attention network based on tunnel face images

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Frontiers of Structural and Civil Engineering 2023年第12期17卷 1796-1812页

作者： Wenjun zhang Wuqi zhang Gaole zhang jun HUANG Minggeng LI Xiaohui WANG Fei YE Xiaoming guan School of Civil Engineering Tianjin UniversityTianjin 300350China School of Civil Engineering and Architecture Guangxi UniversityNanning 530004China Jiangxi Communications Design and Research Institute Co. Ltd.Nanchang 330000China China Railway 18th Bureau Group Co. Ltd.Tianjin 300222China School of Highway Chang'an UniversityXi'an 710064China School of Civil Engineering Qingdao University of TechnologyQingdao 266033China

For real-time classification of rock-masses in hard-rock tunnels,quick determination of the rock lithology on the tunnel face during construction is *** by current breakthroughs in artificial intelligence technology in machine vision,a new automatic detection approach for classifying tunnel lithology based on tunnel face images was *** method benefits from residual learning for training a deep convolutional neural network(DCNN),and a multi-scale dilated convolutional attention block is *** block with different dilation rates can provide various receptive fields,and thus it can extract multi-scale ***,the attention mechanism is utilized to select the salient features adaptively and further improve the performance of the *** this study,an initial image data set made up of photographs of tunnel faces consisting of basalt,granite,siltstone,and tuff was first *** classifying and enhancing the training,validation,and testing data sets,a new image data set was generated.A comparison of the experimental findings demonstrated that the suggested approach outperforms previous classifiers in terms of various indicators,including accuracy,precision,recall,F1-score,and computing ***,a visualization analysis was performed to explain the process of the network in the classification of tunnel lithology through feature ***,this study demonstrates the potential of using artificial intelligence methods for in situ rock lithology classification utilizing geological images of the tunnel face.

关键词： hard-rock tunnel face intelligent lithology identification multi-scale dilated convolutional attention network image classification deep learning

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Metadynamic Recrystallization Behavior of As-cast 904L Superaustenitic Stainless Steel

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Journal of Iron and Steel Research International 2016年第2期23卷 151-159页

作者： Wei zhang Jing zhang Ying HAN Rong LIU De-ning ZOU guan-jun QIAO State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University State Key Laboratory of Solidification Processing Northwestern Polytechnical University Key Laboratory of Advanced Structural Materials of Ministry of Education Changchun University of Technology School of Metallurgy and Engineering Xi'an University of Architecture and Technology

The metadynamic recrystallization （MDRX） behavior of as-cast 904L superaustenitic stainless steel was in- vestigated by double pass isothermal compression tests at temperatures of 950-1 150 ℃, strain rates of 0.05-5 s 1 and interval of 1-100 s. The effects of working parameters （deformation temperature, strain rate, pre-strain and in- terval time） on the flow curves and microstructural evolution were discussed. The MDRX fraction increased obvious- ly with the increase of deformation temperature, strain rate and interval time. The MDRX softening was controlled by the migration of grain boundary, annihilation of dislocation and dynamic recrystallization. Moreover, the kinetic model was established for the prediction of MDRX behavior of as-cast 904L superaustenitic stainless steel based on the experimental data. A good agreement between the predicted and the experimental values was achieved （correla- tion coefficient R2= 0.98）, indicating a satisfactory accuracy.

关键词： superaustenitic stainless steel hot deformation metadynamic recrystallization

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Tests on Application of Soil Magnetic and Integrated Gamma Ray TLD and TC Methods to the Exploration of Sandstone-Type Uranium Deposits

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 418-424页

作者： ZOU Ligui zhang Jiyun YAN jun guan Shaobin Airborne Survey and Remote Sensing Center of Nuclear Industry P.O.Box 183Shijiazhuang 050002

This paper introduces the test results of the soil magnetic survey and the integrated gamma-ray TLD and TC methods for sandstone-type uranium exploration and describes the prospecting mechanism. The tests have proved that these approaches have yielded good results on classifying the sedimentary facies, defining the redox transitional zones and reflecting deep mineralization information. They may probably become new methods on searching for sandstone-type uranium deposits.

关键词： soil magnetism gamma-ray thermoluminescence dosimetry total count rate of gamma ray sandstone-type uranium deposit

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Sensor/Actuator Faults Detection for Networked Control Systems via Predictive Control

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International Journal of Automation and computing 2013年第3期10卷 173-180页

作者： Yu-Yan zhang jun-Ling zhang Xiao-Yuan Luo Xin-Ping guan Institute of Electrical Engineering Yanshan University

Quantized fault detection for sensor/actuator faults of networked control systems （NCSs） with time delays both in the sensor-to-controller channel and controller-to-actuator channel is concerned in this paper. A fault model is set up based on the possible cases of sensor/atuator faults. Then, the model predictive control is used to compensate the time delay. When the sensors and actuators are healthy, an H stability criterion of the state predictive observer is obtained in terms of linear matrix inequality. A new threshold computational method that conforms to the actual situation is proposed. Then, the thresholds of the false alarm rate （FAR） and miss detection rate （MDR） are presented by using our proposed method, which are also compared with the ones given in the existin~ literatures. Finally, some numerical simulations are shown to demonstrate the effectiveness of the proposed method.

关键词： Networked control system fault detection false alarm rate (FAR) miss detection rate (MDR) predictive control.

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Enhancement of Formation of Polar Microenvironment in Polymer by Compressed CO_(2)

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Chinese Chemical Letters 2002年第9期13卷 901-902页

作者： Rui zhang jun HE jun LIU Bu Xing HAN guan Ying YANG The Center for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100080

The copolymer (EO)22(PO)52(EO)22 in p-xylene can solubilize much more water in the presence of compressed CO2 than the case without CO2.

关键词： Reverse micelles polymer surfactant carbon dioxide.

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