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Research on the Infuence of Multiple Parameters on the Responses of a B-type Subway Train

Chinese Journal of Mechanical Engineering 2022年第4期35卷 313-330页

作者： Yanwen Liu Bing Yang Shoune Xiao Tao zhu Guangwu Yang Ruixian xiu State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Basic R&D Department National Railway Passenger Car Engineering Research CenterChangchun Railway Vehicles Co.LtdChangchun 130113China College of Engineering Changchun Normal UniversityChangchun 130032China

To obtain improved comprehensive crashworthiness criteria for a B-type subway train,the infuence laws of the vehicle design collision weight M and empty stroke D on the train’s collision responses were investigated,and multiobjective optimization and decision-making were performed to minimize TS(total compression displacement along the moving train)and TAMA(the overall mean acceleration along the moving train).Firstly,a one-dimensional train collision dynamics model was established and verifed by comparing with the results of the fnite element ***,based on the dynamics model,the infuence laws of M and D on the collision responses,such as the energy-absorbing devices’displacements and absorbed energy,vehicles’velocity and acceleration,TS,TAMA and the coupling correlation efect were ***,surrogate models for TS and TAMA were developed using the optimal Latin hypercube method(OLHD)and response surface method(RSM),and multi-objective optimization was conducted using the particle swarm optimization algorithm method(MPOSO).Finally,the entropy method was used to obtain the weight coefcients for TS and TAMA,and multi-objective decision-making was *** results indicate that D and M signifcantly afect the compression displacements and energy absorption of the frst three collision interfaces,but have limited impact on the last three collision *** velocity versus time curves of vehicle M1 and M2 are shifted and parallel with diferent ***,the velocity versus time curves of all the vehicles are shifted but gradually divergent with diferent *** maximum collision instantaneous accelerations of the vehicles are directly determined by M,but are only slightly afected by *** the coupling efect,all concerned collision responses are strongly correlated with M;however,the responses are weakly correlated with D except for the compression displacement at the M2-M3 collision interface and the maximum collision instantaneous acceleration

关键词： Train collision response Multi-body dynamics model Experiment design Surrogate model Multiobjective optimization Entropy method Multi-objective decision-making

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Hydrogen trapping and electrochemical corrosion behavior of V–N microalloyed X80 pipeline steels consisting of acicular ferrite and polygonal ferrite

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Journal of Iron and Steel Research International 2022年第10期29卷 1683-1693页

作者： Ming-ming Wang xiu-hua Gao Li-ying Song Cheng-lin zhu Lin-xiu Du Raja Devesh Kumar Misra State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA

Hydrogen trapping behavior of V–N microalloyed X80 pipeline steels was studied by means of hydrogen permeation and hydrogen induced cracking(HIC)*** addition,the electrochemical performance of the steels in 3.5 wt.%NaCl solution was *** indicated that the microstructure of experimental steels mainly consisted of acicular ferrite and polygonal ferrite(PF).When the fraction of PF was 9.1%and 30.4%,hydrogen effective diffusion coefficient was 1.624×10^(−6) and 3.121×10^(−6) cm^(2)/s,*** pipeline steels were not susceptible to *** potential hydrogen traps distributed in homogeneous dispersion were conducive to high HIC *** increasing the fraction of PF from 9.1%to 30.4%,the corrosion current density increased from 5.39×10^(−6) to 9.49×10^(−6) A cm^(−2),the corrosion potential decreased from−0.48 to−0.57 V,and the charge transfer resistance decreased from 2301 to 2068Ωcm^(2),*** fraction of PF was disadvantageous for corrosion resistance because of galvanic corrosion.

关键词： Pipeline steel V-N microalloying Hydrogen induced cracking susceptibility Hydrogen permeation Electrochemical corrosion

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Efficacy and safety of subthreshold micropulse laser in the treatment of acute central serous chorioretinopathy

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International Journal of Ophthalmology(English edition) 2023年第6期16卷 921-927页

作者： Jian-Jie Guo xiu-juan Li Jing-Jing Wan Department of Ophthalmology the First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450000Henan ProvinceChina

·AIM:To analyze the efficacy and safety of subthreshold micropulse laser(SML)in the treatment of acute central serous chorioretinopathy(CSC).·METHODS:This is a retrospective case analysis *** 58 eyes of 58 patients were enrolled,and they were divided into different *** 39 patients were treated with SML(SML group)and 19 patients were only observed(observation group).The follow-up period was 3mo after *** best corrected visual acuity(BCVA),central retinal thickness(CRT),superficial retinal vascular density(SRVD),deep retinal vascular density(DRVD),the superficial and deep foveal avascular zone(FAZ)area,retinal light sensitivity(RLS),perfusion area of choroidal capillary layer(CCL),subfoveal choroidal thickness(SFCT)and fundus autofluorescence(FAF)were investigated.·RESULTS:The BCVA,CRT,SRVD,DRVD,the superficial and deep FAZ area,RLS,SFCT of SML group were significantly improved at 3mo(all P0.05).At the last follow-up,the BCVA and RLS in the SML group were better than those in the observation group,and CRT was lower,SRVD and DRVD,perfusion area of CCL were larger(all P<0.05).On FAF,no change of treatment spots was found after *** structural laser damage was observed on optical coherence tomography(OCT)and optical coherence tomography angiography(OCTA),and no choroidal neovascularization was observed.·CONCLUSION:SML treatment of acute CSC can improve BCVA,RLS,and perfusion area of CCL,reduce CRT,increase SRVD and DRVD,and is safe.

关键词： central serous chorioretinopathy subthreshold micropulse laser optical coherence tomography angiography microperimetry

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Mechanism study of electrochemical oxidation in the terylene diaphragm cell

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Journal of Environmental Sciences 2006年第1期18卷 33-39页

作者： YU xiu-juan WANG Hui SUN De-zhi SONG Lai-wen WU Lan Department of Environmental Science and Engineering Heilongjiang University Harbin 150086 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

By using a self-made carbon/polytetrafluoroethylene （C/PTFE） O2-fed as cathode and Ti/IrO2/RuO2 as anode, the effects of electrochemical oxidation of phenol and the coal-gas wastewater containing phenol were studied. The terylene diaphragm which kept pH〉12 in cathodic compartment and pH〈1 in the anodic compartment was selected in the experiment in comparison with the other types of diaphragm. Furthermore, hydroxyl radical （HO·） was determined in the cathodic compartment of the diaphragm cell by electron spin resonance spectrum（ESR） and the fluorescence spectra. Compared with pH, the accumulated HzO2 and the COD removal of the no-diaphragm cell, the mechanism of electrochemical oxidation in the terylene diaphragm cell was supposed. The degradation of phenol was supposed to be cooperative oxidation by direct or indirect electrochemical oxidation at the anode and H2O2, HO· produced by oxygen reduction at the cathode. The mineralization of phenol in the diaphragm cell was better than that in the no-diaphragm cell. When the coal-gas wastewater was treated by the electrolysis system with terylene diaphragm, the average removal efficiency of the volatile phenol and COD were 100% and 79.6%, respectively.

关键词： electrochemical oxidation C/PTFE O2-fed cathode terylene diaphragm hydroxyl radical

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Clinical characteristics and ABCC2 genotype in Dubin-Johnson syndrome:A case report and review of the literature

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World Journal of Clinical Cases 2021年第4期9卷 878-885页

作者： Huan Wu Xue-Ke Zhao juan-juan zhu Department of Infectious Diseases The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550001Guizhou ProvinceChina

BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 *** is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiopathic jaundice as the main clinical *** alterations of the ABCC2 gene are commonly used for diagnosing DJS;however,the causative ABCC2 point mutation in Chinese patients remains *** on ABCC2 mutations in Chinese DJS patients is extremely rare,and the diagnosis of DJS remains *** routine analysis of ABCC2 mutations is helpful for the diagnosis of ***,we report the clinical characteristics and ABCC2 genotype of an adult female DJS *** article is to expound the discovery of more potentially pathogenic ABCC2 variants will that contribute to DJS *** SUMMARY This study investigated a woman referred for DJS and involved clinical and genetic ***2 mutations were identified by next-generation sequencing(NGS).The patient showed intermittent jaundice and conjugated *** examinations were consistent with the typical phenotype of *** diagnostic analysis revealed an ABCC2 genotype exhibiting a pathogenic variant,namely c.2443C>T(***815*),which has not been reported previously in the domestic or foreign *** Pathogenic ABCC2 mutations play an important role in the diagnosis of DJS,especially in patients with atypical ***,NGS is used in the routine analysis of DJS cases and such tests of further cases will better illuminate the relationship between various genotypes and phenotypes of DJS.

关键词： Dubin-Johnson syndrome ABCC2 genotype Next-generation sequencing ABCC2 mutation Homozygous mutation Case report

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Silicon-erbium ytterbium silicate nanowire waveguides with optimized optical gain

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Frontiers of physics 2017年第1期12卷 57-63页

作者： Xiao-Xia Wang Wei-Hao Zheng Qing-Lin Zhang Xiao-Li zhu Hong Zhou xiu-juan zhuang An-Lian Pan Xiang-Feng Duan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province School of Physics and Electronic Science and State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University Changsha 410082 China Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA

Single-crystal erbium silicate nanowires have attracted considerable attention because of their high optical gain. In this work, we report the controlled synthesis of silicon-erbium ytterbium silicate core- shell nanowires and fine-tuning the erbium mole fraction in the shell from x = 0.3 to x = 1.0, which corresponds to changing the erbium concentration from 4.8 ×10^21 to 1.6 ×10^22 cm^-3. By controlling and properly optimizing the composition of erbium and ytterbium in the nanowires, we can effectively suppress upeonversion photoluminescence while simultaneously enhancing near-infrared emission. The composition-optimized nanowires have very long photoluminescence lifetimes and large emission cross- sections, which contribute to the high optical gain that we observed. We suspended these concentration- optimized nanowires in the air to measure and analyze their propagation loss and optical gain in the near-infrared communication band. Through systematic measurements using wires with different core sizes, we obtained a maximum net gain of 20 ± 8 dB·mm^-1, which occurs at a wavelength of 1534 nm, for a nanowire with a diameter of 600 nm and a silicon core diameter of 300 nm.

关键词： erbium ytterbium silicate nanowire erbium concentration gain

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Analysis of blade vibration response induced by rotating stall in axial compressor

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航空动力学报 2012年第10期27卷 2269-2277页

作者： Zhang, Ming-Ming Hou, An-Ping Li, Jian-Xiong Yao, juan Chen, Ying-xiu School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100191 China

An experimental and numerical study was conducted to investigate the forced response of blade vibration induced by rotating stall in a low speed axial *** have been made of the transient stalling process in a low speed axial compressor *** CFD study was performed using solution of 3-dimensional Navier-Stokes equations,coupled with structure finite element models for the blades to identify modal shapes and structural deformations *** between fluid and structure were managed in a coupled manner,based on the interface information exchange until convergence in each time *** on the rotating stall measurement data obtained from a low speed axial compressor,the blade aeroelastic response induced by the rotating stall flow field was analyzed to study the vibration characteristics and the correlation between the *** this approach,good agreement between the numerical results and the experimental data was *** flow phenomena were well captured,and the results indicate that the rotating field stall plays a significant role in the blade vibration and stress affected by the flow excitation.

关键词： compressor rotating stall blade forced response CFD fluid-structure interaction

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Effects of basicity and MgO content on the viscosity of the SiO_2-CaO-MgO-9wt%Al_2O_3 slag system

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 353-362页

作者： Yun-ming Gao Shao-bo Wang Chuan Hong xiu-juan Ma Fu Yang Key Laboratory for Ferrous Metallurgy and Resources Utilization of the Ministry of Education Wuhan University of Science and Technology

The effects of basicity and MgO content on the viscosity of SiO2-CaO-MgO-9wt%Al2O3 slags with basicity from 0.4 to 1.0 and MgO content from 13wt%to 19wt%were investigated using the rotating cylinder method. A correlation between the viscosity and the slag structure was determined by Fourier transform infrared （FTIR） spectroscopy. It is indicated that the complex network structure of the slag melt is depolymerized into simpler network units with increasing basicity or MgO content, resulting in a continuous decrease in viscosity of the slag. The viscosity is strongly dependent on the combined action of basic oxide components in the slag. Under the present experimental conditions, increasing the basicity is found to be more effective than increasing the MgO content in decreasing the viscosity of the slag. At higher temperatures, the increase of basicity or MgO content does not appreciably decrease the viscosity of the slag, as it does at lower tem-peratures. The calculated activation energy of viscous flow is between 154 and 200 kJ＆#183;mol-1, which decreases with an increase in basicity from 0.4 to 1.0 at a fixed MgO content in the range of 13wt%to 19wt%.

关键词： slags viscosity basicity magnesia activation energy Fourier transform infrared spectroscopy

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Researches of soft-sediment deformation structures and seismites in China—A brief review

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Journal of Palaeogeography 2016年第4期5卷 311-317页

作者： Zeng-Zhao Feng Zhi-Dong Bao xiu-juan Zheng Yuan Wang China University of Petroleum(Beijing)

During the past 30 years （1987-2016）, a great progress has been made in researches of soft-sediment deformation structures （SSDS）, seismites and pataeoearthquakes in China. However, the research thought of this academic fietd is not open enough. It is atmost with one viewpoint or one voice, i.e., atmost art the papers pubtished in journals of China considered the layers with SSDS as seismites. On the other hand, the authors are very glad to learn that the professors and students of China University of Petroleum （East China） have proposed different academic viewpoints on the origin of SSDS in Lingshan Istand, Qingdao, Shandong Province, China. It is a very active academic atmosphere. The authors＇ ideas are as follows：（1） The SSDS are sedimentary structures with multi-origin. The term ＂SSDS＂ is a good sedimentary and geological term and shoutd be utilized continuat[y. （2） The term ＂seismites＂ is a term which is definitety assigned to the layers with SSDS induced by earthquakes. It is one type of the tayers with SSDS. It is not equal to SSDS. （3） Some geotogists suggested obsoleting the term ＂seismites＂. These suggestions are rational However, since the term ＂seismites＂ has been utilized for a long time in China and worldwide, to obsolete this term should be discussed and agreement should be acquired from numerous geologists in China and worldwide. It may be suitable that let the geological practice decide whether to obsolete it or not. （4） Hopefully, further progress will be made in the researches of SSDS.

关键词： Soft-sediment deformation structures (SSDS) Multi-origin Seismites Pataeoearthquake Ling-shan Island China

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The Arabidopsis LFR Gene Is Required for the Formation of Anther Cell Layers and Normal Expression of Key Regulatory Genes

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Molecular Plant 2012年第5期5卷 993-1000页

作者： xiu-Tang Wang Can Yuan Ting-Ting Yuan Su-juan Cui Key Laboratory of Molecular Cell Biology in Hebei Province College of Life Science Hebei Normal University Shijiazhuang 050016 China

The anther is the male reproductive organ in flowering plants. Although some genes were reported to be involved in anther development, the molecular mechanisms underlying the transcriptional regulation of these genes is unclear. Ifr-2 （leaf and flower related-2）, the null allele of Arabidopsis thaliana LFR （LEAF AND FLOWER RELATED）, was male-sterile. The anthers of Ifr-2 plants were defective in sporogenous cell formation, tapetum development, and pollen development. In agreement with these phenotypes, expression studies showed that LFR was expressed in all cell layers of the anther, and that expression was particularly strong in the tapetal cells and pollen grains, Quantitative RT-PCR analysis revealed that LFR is required for the normal transcription of some anther development-related genes, such as AMS, CALS5, and DYT1, MS1 and MS2, and ROXY2. Genetic analysis showed that SPL was epistatic to LFR while LFR was epistatic to DYT1. We propose that LFR may be a crucial component in the regulation of a genetic network that modulates anther development.

关键词： cell differentiation/specialization gene expression gene regulation genetics reproductive biology Arabidopsis.

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