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An interface shear damage model of chromium coating/steel substrate under thermal erosion load

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Defence Technology（防务技术） 2021年第2期17卷 405-415页

作者： xiao-long Li Yong Zang Yong Lian Min-yu Ma Lei mu Qin Qin School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory for Corrosion Erosion and Surface TechnologyBeijing100083China

The Cr-plated coating inside a gun barrel can effectively improve the barrel’s erosion resistance and thus increase the service ***,due to the cyclic thermal load caused by high-temperature gunpowder,micro-element damage tends to occur within the Cr coating/steel substrate interface,leading to a gradual deterioration in macro-mechanical properties for the material in the related *** order to mimic this cyclic thermal load and,thereby,study the thermal erosion behavior of the Cr coating on the barrel’s inner wall,a laser emitter is utilized in the current *** the help of in-situ tensile test and finite element simulation results,a shear stress distribution law of the Cr coating/steel substrate and a change law of the interface ultimate shear strength are *** have shown that the Cr coating/steel substrate interface’s ultimate shear strength has a significant weakening effect due to increasing *** this study,the interfacial ultimate shear strength decreases from 2.57 GPa(no erosion)to 1.02 GPa(laser power is 160 W).The data from this experiment is employed to establish a Cr coating/steel substrate interface shear damage *** this model is used to predict the flaking process of Cr coating by finite element *** simulation results show that the increase of coating crack spacing and coating thickness will increase the service life of gun barrel.

关键词： Cr coating/steel substrate Thermal erosion Finite element simulation Ultimate shear strength Interface shear damage model

Structural and Critical Behaviors of Ag Rough Films Deposited on Liquid Substrates

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Chinese Physics Letters 1996年第10期13卷 772-774页

作者： YE Gao-xiang FENG Chun-mu ZHANG Qi-rui GE Hong-liang ZHANG Xuan-jia Department of Physics Hangzhou UniversityHangzhou 310028 Department of Physics Zhejiang UniversityHangzhou 310027

A new Ag rough film system, deposited on silicone oil surfaces by rf-magnetron sputtering method, has been fabricated. The chrysanthemum-like surface morphology at micron length scale is observed. It is proposed that the anomalous critical behavior mainly results from the relative shift between the Ag atom clusters and the substrate. The discussion of the deposition mechanism is also presented.

关键词： Rough mechanism film

Profibrotic role of the SOX9-MMP10-ECM biosynthesis axis in the tracheal fibrosis after injury and repair

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Genes & Diseases 2024年第5期11卷 360-373页

作者： Lei Gu Anmao Li Chunyan He rui xiao Jiaxin Liao Li Xu Junhao mu xiaohui Wang Mingjin Yang Jinyue Jiang Yang Bai Xingxing Jin Meiling xiao Xia Zhang Tairong Tan Yang xiao Jing Lin Yishi Li Shuliang Guo Department of Respiratory and Critical Care Medicine The First Affiliated Hospital of Soochow UniversitySuzhou 215006China Department of Respiratory and Critical Care Medicine The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China Department of Infection Disease The First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiang 325000China

Fibroblast activation and extracellular matrix(ECM)deposition play an important role in the tracheal abnormal repair process and *** a transcription factor,SOX9 is involved in fibroblast activation and ECM ***,the mechanism of how SOX9 regulates fibrosis after tracheal injury remains *** investigated the role of SOX9 in TGF-b1-induced fibroblast activation and ECM deposition in rat tracheal fibroblast(RTF)***9 overexpression adenovirus(Ad-SOX9)and siRNA were transfected into RTF *** found that SOX9 expression was up-regulated in RTF cells treated with ***9 overexpression activated fibroblasts and promoted ECM *** SOX9 inhibited cell proliferation,migration,and ECM deposition,induced G2 arrest,and increased apoptosis in RTF ***-seq and chromatin immunoprecipitation sequencing(ChIP-seq)assays identified MMP10,a matrix metalloproteinase involved in ECM deposition,as a direct target of SOX9,which promotes ECM degradation by increasing MMP10 expression through the Wnt/b-catenin signaling ***,in vivo,SOX9 knockdown ameliorated granulation proliferation and tracheal fibrosis,as manifested by reduced tracheal *** conclusion,our findings indicate that SOX9 can drive fibroblast activation,cell proliferation,and apoptosis resistance in tracheal fibrosis via the Wnt/b-catenin signaling *** SOX9eMMP10 eECM biosynthesis axis plays an important role in tracheal injury and *** SOX9 and its downstream target MMP10 may represent a promising therapeutic approach for tracheal fibrosis.

关键词： Extracellular matrix deposition Fibroblast activation MMP10 SOX9 Tracheal fibrosis

Value of optical coherence tomography measurement of macular thickness and optic disc parameters for glaucoma screening in patients with high myopia

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World Journal of Clinical Cases 2023年第14期11卷 3187-3194页

作者： Hua mu rui-Shu Li Zhen Yin Zhuo-Lei Feng Department of Ophthalmology The First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina

BACKGROUND The basic method of glaucoma diagnosis is visual field examination,however,in patients with high myopia,the diagnosis of glaucoma is *** To explore the value of optical coherence tomography(OCT)for measuring optic disc parameters and macular thickness as a screening tool for glaucoma in patients with high *** Visual values(contrast sensitivity,color vision,and best-corrected visual acuity)in three groups,patients with high myopia in Group A,patients with high myopia and glaucoma in Group B,and patients with high myopia suspicious for glaucoma in Group C,were *** disc parameters,retinal nerve fiber layer(RNFL)thickness,and ganglion cell layer(GCC)thickness were measured using OCT technology and used to compare the peri-optic disc vascular density of the patients and generate receiver operator characteristic(ROC)test performance curves of the RNFL and GCC for high myopia and *** Of a total of 98 patients admitted to our hospital from May 2018 to March 2022,totaling 196 eyes in the study,30 patients with 60 eyes were included in Group A,33 patients with 66 eyes were included in Group B,and 35 patients with 70 eyes were included in Group *** were processed for Groups A and B to analyze the efficacy of RNFL and GCC measures in distinguishing high myopia from high myopia with *** area under the ROC curve was greater than 0.7,indicating an acceptable diagnostic *** The value of OCT measurement of RNFL and GCC thickness in diagnosing glaucoma in patients with high myopia and suspected glaucoma is worthy of development for clinical use.

关键词： High myopia suspected glaucoma Optical coherence tomography Retinal nerve fiber layer thickness Ganglion cell layer thickness Diagnostic efficacy

Loss of ozone on sulfate and sulfide doped ice surfaces

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Journal of Environmental Sciences 2000年第2期12卷 64-68页

作者： mu, Yu-Jing Zhang, xiao-Shan Liu, Ye Yang, Wen-Xiang Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

The sticking coefficients of ozone on ice surface and solid solution of sulfate and sulfide were measured over a temperature range from 200K to 260K. Experiments were performed in a horizontal flow tube. Results indicate that the sticking coefficients of ozone on ice are in the range from 1 3×10 -7 to 2 7×10 -6 , and it will become larger as temperature increases; the sticking coefficients of ozone on eight kinds of 0.1mol/L sulfate doped ice are in the range from 1 8×10 -7 to 6 9×10 -6 ; the sticking coefficients of ozone on four kinds of 0 1 mol/L sulfide doped ice are in the range from 3 2×10 -7 to 2 1×10 -5 . Ozone loss on these particles was evaluated.

关键词： sticking coefficient ozone ice flow\|tube sulfate sulfide CLC number: X132 Document code: A

基于多尺度空间分辨率的空间负荷预测误差评价方法

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中国电机工程学报 2015年第22期35卷 5731-5739页

作者：肖白蒲睿穆钢东北电力大学电气工程学院吉林省吉林市132012

针对如何评估空间负荷预测(spatial load forecasting,SLF)中空间误差的难题,提出了基于多尺度空间分辨率的空间负荷预测误差评价方法。该方法考虑到SLF的局部预测误差会对整个预测区域产生影响,从如何计算局部预测误差给其他位置预测... 详细信息

针对如何评估空间负荷预测(spatial load forecasting,SLF)中空间误差的难题,提出了基于多尺度空间分辨率的空间负荷预测误差评价方法。该方法考虑到SLF的局部预测误差会对整个预测区域产生影响,从如何计算局部预测误差给其他位置预测值带来影响的问题入手,将极端场景作为边界条件分析SLF结果的误差地图,揭示了在不同空间分辨率下,对相同的空间预测误差的感知程度多数情况并不一样,甚至还可能完全相反的演变规律,建立了针对既有网架结构、供电容量和规划目标年负荷水平的SLF误差评价机制,给出了SLF误差评价指标。运用该方法对东北某市的一个行政区进行空间负荷预测的工程实例表明,所提出的SLF误差评价方法是行之有效的。

关键词：空间负荷预测地理信息系统电力负荷空间分辨率多尺度空间误差电力系统规划

Excellent Color Sensitivity of Butterfly Wing Scales to Liquid Mediums

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Journal of Bionic Engineering 2016年第3期13卷 355-363页

作者： Zhiwu Han Meng Yang Bo Li Zhengzhi mu Shichao Niu Junqiu Zhang xiao Yang Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changchun 130022 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130022 China Hangzhou Branch of Technical Institute of Physics and Chemistry Chinese Academy of Sciences Hangzhou 310018 China School of Mechanical Engineering Hangzhou Dianzi University Hangzhou 310018 China

The ultrastructure characteristic and vivid colors of butterfly wing scales have attracted considerable attention recently. Surprisingly, these hyperfine structures also endow butterfly Trogonoptera brookiana wing scales the excellent color sensitive property to liquid mediums. In this work, the characteristic features of this excellent functional surface and the mechanism of its highly sensitive response characteristics were investigated. Firstly, the extraordinary and ordered nanostructures of this butterfly wing scales were characterized by a Field Emission Scanning Electron Microscope （FESEM）. Then, the ultra-depth three-dimensional （3D） microscope was used to observe the sensitive discoloration effect of the scales to liquid mediums. Afterwards, the highly spectral sensitive feature was identified by a mini spectrometer. In addition, the mechanism of this color sensitive effect of butterfly wing scales was revealed through modelling, calculation and simulation. It was found that this sensitivity is caused by the combined action of the microscale scales and the ultra-fine nanoscale structures in scale surface. On one hand, the arched and bended cover scales were stretched and superimposed by the filled ether solution. So, the color of the scales became reddish brown in an instant. On the other hand, the change of the fill mediums with different reflective index induced the modification of the surface interference, resulting in the peak shift of the reflectance spectrum. More importantly, the results of simulation and theoretical calculation were both in agreement with the experimental results. It illustrated that the butterfly TrogonOptera brookiana wings have repeatable sensitivity to liquid mediums, and obvious discoloration sensitive effect. This spectral sensitivity of butterfly wing scales has great prospect and meaning for the basic research and application of cheap, environmentally free and biodegradable sensitive element for water quality monitoring and

关键词： color sensitivity micro and nanostructures butterfly wing scales bionics

Semiparametric Analysis of Longitudinal Data with Informative Observation Times

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Acta Mathematicae Applicatae Sinica 2011年第1期27卷 29-42页

作者： Liu-quan Sun xiao-yun mu Zhi-hua Sun Xing-wei Tong Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China School of mathematical Sciences Beijing Normal University Beijing 100875 China

In many longitudinal studies, observation times as well as censoring times may be correlated with longitudinal responses. This paper considers a multiplicative random effects model for the longitudinal response where these correlations may exist and a joint modeling approach is proposed via a shared latent variable. For inference about regression parameters, estimating equation approaches are developed and asymptotic properties of the proposed estimators are established. The finite sample behavior of the methods is examined through simulation studies and an application to a data set from a bladder cancer study is provided for illustration.

关键词： Estimating equations Informative observation times Joint modeling Latent variables,Longitudinal data

Fatigue Strength Improvement of Welded Joint by Ultrasonic Peening in Ultra-Fine Grain Steel

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Journal of Iron and Steel Research International 2003年第3期10卷 64-66页

作者： TIAN Zhi-ling ZOU Gang HE Chang-hong ZHANG xiao-mu Central Iron and Steel Research Institute

The influence of rare earths (RE) on carbides in high carbon steel weld metal was studied by transmission electron microscope (TEM) and energy dispersive X ray microanalysis (EDX). It is found that rare earth markedly affects the quantity, morphology and distribution of carbides. The precipitating mechanism of carbides was proposed in which rare earth compounds with high surface energy serve as the nucleation sites for carbides in superheated liquid metal and the induced carbides are precipitated extensively and distributed evenly. The preferential precipitation of carbides decreases the carbon content in matrix, which is transformed into low carbon lath martensite after welds are chilled to room temperature.

关键词： rare earth metal carbide weld