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Effect of C/Mo Duplex-coating on Thermal Residual Stresses in SiCf/Ti2AlNb Composites

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Journal of Wuhan University of Technology(Materials Science) 2021年第4期36卷 526-532页

作者： ZHU Tangkui WANG Degui luo xian School of Electromechanical and Information Technology Yiwu Industrial and Commercial CollegeYiwu 322000China School of Materials Science Northwestern Polytechnical UniversityXi'an 710072China

Three-dimensional finite element physical models considering the layered distribution of materials at the interface were developed to study the effect of the coating system on distributions of thermal residual stresses in SiCf/Ti2AlNb *** coating systems were comparatively studied,namely C coating and C/Mo *** thermal residual stresses after 1 080 ℃/1 h solution treatment and 800 ℃/20 h ageing treatment in the composites were also *** experimental results show that Mo coating can decrease thermal residual stress magnitude in the ***,it would increase the thermal residual stresses in the interfacial reaction layer of *** change of radial thermal residual stress in TiC layer is inconspicuous after solid solution and ageing treatment,but the hoop and axial thermal residual stresses increase ***,the heat treatment can obviously reduce hoop and axial thermal residual stresses of the matrix,which is benefit to restrain the initiation and propagation of cracks in the matrix.

关键词： finite element simulation titanium matrix composite SiC fiber thermal residual stress

Landslide data mosaicking based on an airborne laser point cloud and multi-beam sonar images

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Journal of Mountain Science 2020年第9期17卷 2068-2080页

作者： JI Hao-wei luo xian-qi ZHOU Yong-jun School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Landslides are one of the most disastrous geological hazards in southwestern *** a landslide becomes unstable,it threatens the lives and safety of local ***,empirical studies on landslides have predominantly focused on landslides that occur on *** this end,we aim to investigate ashore and underwater landslide data *** study proposes an optimized mosaicking method for ashore and underwater landslide *** method fuses an airborne laser point cloud with multi-beam depth sounder *** to their relatively high efficiency and large coverage area,airborne laser measurement systems are suitable for emergency investigations of *** on the airborne laser point cloud,the traversal of the point with the lowest elevation value in the point set can be used to perform rapid extraction of the crude channel *** meticulous extraction of the channel boundaries is then implemented using the probability mean value optimization *** addition,synthesis of the integrated ashore and underwater landslide data angle is realized using the spatial guide line between the channel boundaries and the underwater multibeam sonar images.A landslide located on the right bank of the middle reaches of the Yalong River is selected as a case study to demonstrate that the proposed method has higher precision thantraditional *** experimental results show that the mosaicking method in this study can meet the basic needs of landslide modeling and provide a basis for qualitative and quantitative analysis and stability prediction of landslides.

关键词： Laser point cloud Airborne laser measurement Mosaicking method Multi-beam sonar images Shipborne Channel boundaries

Suppression of vortex rope oscillation and pressure vibrations in Francis turbine draft tube using various strategies

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Journal of Hydrodynamics 2021年第3期33卷 534-545页

作者： Lei Zhu Rui-zhi Zhang An Yu Li Lu xian-wu luo China Institute of Water Resources and Hydropower Research Beijing100038China State Key Laboratory of Hydroscience and Engineering Department of Energy and Power EngineeringTsinghua UniversityBeijing100084China College of Energy and Electrical Engineering Hohai UniversityNanjing210098China

The vortex rope usually occurs in the draft tube of the Francis turbine operated under part-load conditions,to induce strong low-frequency pressure vibrations,and therefore,is very harmful to the safety of the hydropower *** the present work,three kinds of strategies are extensively investigated,i.e.,the installations of the ventilation and the fin,as well as the hybrid strategy of the air admission through a fin,so as to effectively suppress the vortex rope oscillation and the pressure vibration in the draft tube of a Francis turbine,whose specific speed is 125 *** the unsteady flow simulation,the Reynolds averaged Navier-Stokes(RANS)method is applied coupled with the k-ω SST turbulence model and a homogeneous cavitation *** flow analysis confirms that the low-frequency pressure vibrations are originated from the periodical oscillation of the vortex rope,and the cavitation usually enhances the vortex rope oscillation in the draft *** the part-load condition,the dominant component of the pressure vibration in the draft tube has a frequency,for example,f_(1),lower than the runner rotating frequency f_(n).It is shown that all three strategies can be adopted to alleviate the vortex rope oscillation and the pressure vibrations in the draft tube,but their suppression mechanisms are quite *** ventilation of an adequate amount from the turbine runner cone can change the vortex rope geometry from the spiral type to the cylindrical type,suppress the vortex rope oscillation,and consequently create the homogeneous distributions of the pressure and the pressure gradient in the draft *** the other hand,a fin installed at the draft tube wall can induce a small extra rope,and the interaction between the main vortex rope and the extra rope changes the flow field and alleviates the pressure vibration in the draft *** should be noted that a fin is much more effective to suppress the pressure vibration in the draft tube under the cavitation cond

关键词： Francis turbine vortex rope pressure vibration ventilation fin installation

Study of Oxidation of Glutathione Treated with Hypochlorous Acid by Capillary Electrophoresis

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Chinese Chemical Letters 2001年第7期12卷 623-624页

作者： xian luo Jian De LU Xiao Yun FU Analytical and Testing Center Zhejiang UniversityHangzhou 310027

Capillary electrophoresis (CE) method was developed for the separation and quantification of reduced glutathione (GSH), oxidized glutathione (GSSG) and glutathione sulphonic acid (GSO(3)H). Baseline separation was obtained within five minutes. The effects of reaction time and molar ratio of hypochlorous acid (HOCl) to GSH on the oxidation of GSH were investigated.

关键词： Glutathione oxidation capillary electrophoresis

Study of Oxidation of Glutathione by Capillary Electrophoresis

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Chinese Chemical Letters 2001年第4期12卷 363-364页

作者： xian luo Jian De LU Xiao Yun FU Department of Chemistry Zhejiang UniversityHangzhou 310027

A capillary electrophoresis method for the separation and quantification of reduced glutathione (GSH) and oxidized glutathione (GSSG) was developed. A baseline separation was achieved within five minutes. The effects ... 详细信息

关键词： Glutathione oxidation capillary electrophoresis

C/Ti/Cu interfacial reaction in SiCf/Cu composites

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Rare Metals 2011年第4期30卷 396-400页

作者： luo xian YANG Yanqing WANG Chen LOU Juhong XUE Chunling State Key Laboratory of Solidification Processing School of Materials Science Northwestern Polytechnical University Xi＇an 710072 China

Continuous SiC fiber reinforced copper matrix （SiC~/Cu） composites were prepared by fiber coating method, and Ti6A14V interlayer was introduced as an interfacial modification coating to improve the interfacial bonding strength. The interfacial reaction characteristics were investigated by transmission electron microscopy （TEM）. The results show that nearly all the titanium atoms reacted with the carbon coating of SiC fibers to form two layers of TiC. Also, a thin copper layer that is sandwiched between these two layers was detected. No Ti-Cu interfacial reaction product was observed. The formation process of the interfacial reaction along with its mechanism was discussed.

关键词： metallic matrix composite copper interfacial reactions silicon carbide fibers

Quasicrystal dissolution and performance of isothermally heat-treated Mg–Zn–Y alloy

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Rare Metals 2015年第7期34卷 452-456页

作者： Di-Qing Wan xian luo Ya-Juan Liu Tian Yu Key Laboratory of Ministry of Education for Conveyance and Equipment East China Jiaotong University State Key Laboratory of Solidification Processing Northwestern Polytechnical University School of Materials Science Northwestern Polytechnical University

Conventional casting method was employed to prepare Mg–Zn–Y alloy only with a-Mg+I-phase; however, the grain size of quasicrystal is quite large in the ascast ***, isothermal treatment was applied to refine the quasicrystal *** result shows that after the Mg–Zn–Y alloy was isothermally treated at 500 °C for several hours, the coarse quasicrystal can be gradually dissolved and thus ***, the dissolving processes of quasicrystal are slow first and then accelerate;after isothermally treated with 8 h at 500 °C, the quasicrystal is almost completely dissolved into the matrix only with 1–5 lm tiny quasicrystals *** of quasicrystal can markedly reduce the wear resistance, but increase the corrosion resistance.

关键词： Magnesium alloy Quasicrystal Isothermal treatment

The functions of N6-methyladenosine modification in lncRNAs

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Genes & Diseases 2020年第4期7卷 598-605页

作者： Rong-Zhang He Jing Jiang Di-xian luo Department of Clinical Pharmacology Xiangya HospitalCentral South UniversityChangsha410078HunanChina Translational Medicine Institute National&Local Joint Engineering Laboratory for High-through Molecular Diagnosis TechnologyCollaborative Research Center for Post-doctoral Mobile Stations of Central South UniversityAffiliated the First People’s Hospital of ChenzhouUniversity of South ChinaChenzhou423000China Center for Clinical Pathology The First People’s Hospital of ChenzhouUniversity of South ChinaChenzhou423000People’s Republic of China

Increasing evidence indicates that mRNAs are often subject to posttranscriptional *** them,N6-methyladenosine(m6A),which has been shown to play key roles in RNA splicing,stability,nuclear export,and translation,is the most abundant modification of *** studies of m6A modification of mRNAs have been carried out,while little is known about m6A modification of long non-coding RNAs(lncRNAs).Recently,several studies reported m6A modification of *** this review,we focus on these m6A-modified lncRNAs and discuss possible functions of m6A modification.

关键词： Erasers LncRNA N6-methyladenosine Readers Writers

Removing aluminum from a low-concentration lixivium of weathered crust elution-deposited rare earth ore with neutralizing hydrolysis

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Rare Metals 2017年第8期36卷 685-690页

作者： xian-Ping luo Li-Ping Zou Pei-Long Ma Cai-Gui luo Jing Xu Xue-Kun Tang Faculty of Resource and Environmental Engineering JiangxiUniversity of Science and TechnologyGanzhou 341000China Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control Gauzhou 341000China Key Laboratory of Southern Ionic-Type Rare Earth Resources Development and Application Ministry of EducationGanzhou 341000China Faculty of Engineering University of AlbertaEdmontonAB T6G2V4Canada

Aluminum,the main impurity in the lixivium of weathered crust elution deposited rare earth ore,not only results in an increasing consumption of precipitant in the rare earth precipitation process,but also lowers the purity of final rare earth *** in the weathered crust elution-deposited rare earth ore lixivium should be *** hydrolysis method was employed to remove aluminum from the *** was found to be the optimum pH regulator for the removal of aluminum in the low *** used to adjust the pH value of the lixivium to 5.0,aluminum in the lixivium can be effectively removed in the form of aluminum hydroxide precipitation with removal rate of 97.60%.It shows that hexamethylenetetramine has a good effect on the removing of aluminum ions from the lowconcentration ***,hexamethylenetetramine in removing aluminum from lixivium has little adverse effect on the RE precipitation process.

关键词： Weathered crust elution-deposited rare earth ore Lixivium, Aluminum removing Hexamethylenetetramine