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Microstructure and properties of hybrid additive manufacturing 316L component by directed energy deposition and laser remelting

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Journal of Iron and Steel Research International 2020年第7期27卷 842-848页

作者： xiao-hui chen Bo chen Xu cheng Guo-chao Li Zheng Huang National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research CenterMinistry of Education on Laser Direct Manufacturing for Large Metallic ComponentsSchool of Materials Science and EngineeringBeihang UniversityBeijing 100191China Research Center for Processing AECC Shanghai Commercial Aircraft Engine Manufacturing Co.Ltd.Shanghai 201306China

Arc additive manufacturing is a high-productivity and low-cost technology for directly fabricating fully dense metallic ***,this technology with high deposit rate would cause degradation of dimensional accuracy and surface quality of the metallic component.A novel hybrid additive manufacturing technology by combining the benefit of directed energy deposition and laser remelting is *** hybrid technology is successfully utilized to fabricate 316L component with excellent surface *** show that laser remelting can largely increase the amount ofδphases and eliminateσphases in additive manufacturing 316L component surface due to the rapid *** leads to the formation of remelting layer with higher microhardness and excellent corrosion resistance when compared to the steel made by directed energy deposition *** laser remelting power can improve surface quality as well as corrosion resistance,but degrade microhardness of remelting layer owing to the decrease inδphases.

关键词： Hybrid additive manufacturing Laser remelting Directed energy deposition Microstructure Corrosion resistance

MHD Control of Oblique Detonation Waves

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Chinese Physics Letters 2011年第1期28卷 134-137页

作者： SUN xiao-hui chen Zhi-Hua ZHANG Huan-Hao Key Laboratory of Transient Physics Nanjing University of Science & Technology Nanjing 210094

Based on the Euler equation, the hybrid Roe/HLL scheme is employed to simulate the oblique detonation waves （ODWs）. Furthermore, ***）＇namic （MHD） control of both stable and unstable ODWs is investigated. It is shown that the stable ODW wave front can be controlled to the desired position under different inflow Mach numbers. However, for an unstable ODW, it is difficult for the MHD control to return the ODW front, but the unstable ODW turns to be stable with the Lorentz force applied in proper direction.

关键词： Fluid dynamics

A novel spectrophotometric determination of copper(Ⅱ) with bromosulphonazoⅢ

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Chinese Chemical Letters 2008年第1期19卷 92-94页

作者： Li Yuan Shu hui Huo xiao Na Ren hui chen Chemistry ＆ Chemical Engineering College Northwest Normal University Lanzhou 730070 China

A novel chromogenic reaction involving copper（Ⅱ） and bromosulphonazo Ⅲ （Br-SAZⅢ） in hexamethylenetetramine- hydrochloric buffer solution was investigated. The results showed that a blue complex of copper（Ⅱ） and bromosulphonazo Ⅲ was formed with a molar ratio of 1：1. The apparent molar absorptivity was 3.3×10^5Lmol-1cm-1 and the maximum absorption peak was at 616.8 nm. The proposed procedure was used for quantitative estimation of Cu（II） in the concentration range of 0-1.024μg/mL with the detection limit （3σ） of 7.03 × 10^-4 μg/mL （n = 20）. The relative standard deviations （RSDs） were 0.56-4.68%. Under the optimized conditions, total copper in the vegetables and tea was successfully determined. 2007 Li Yuan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Spectrophotometry Bromosulphonazo Ⅲ Copper(Ⅱ) Vegetable Tea

Effect of superplastic deformation on the bonding property of 00Cr25Ni7Mo3N duplex stainless steel

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 317-321页

作者： xiao-hui chen Xue-ping Ren hui Xu Jian-guo Tong Hai-yan Zhang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Sinosteel Equipment ＆ Engineering Co. Ltd. Beijing 100080 China

The superplastic deformation diffusion bonding of 00Cr25Ni7Mo3N duplex stainless steel was performed on a hot simulator. The microstructure of the bonding interface was characterized by scanning electron microscopy （SEM） and electron backscatter diffraction （EBSD）. The mechanical properties of the specimen were investigated by a shear strength test. The results indicated that the shear strength was improved with the increase of superplastic deformation reduction. When the deformation reduction was up to 50%, the shear strength of the specimen achieved 417 Mpa, approaching to that of the base metal. In addtion, the superplastic diffusion bonding technique was not very sensitive to surface roughness levels. When the surface roughness of the bonding specimen surpassed 0.416 pan （level G2）, the shear strength achieved at least 381 MPa.

关键词： stainless steel superplastic deformation diffusion bonding surface roughness shear strength

Exotic ΩΩ dibaryon states in a molecular picture

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Chinese Physics C 2021年第4期45卷 6-13页

作者： xiao-hui chen Qi-Nan Wang Wei chen Hua-Xing chen School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Southeast UniversityNanjing 210094China

We investigate the exotic ΩΩ dibaryon states with J^(P)=0^(+)and 2^(+)in a molecular *** construct a tensorΩΩmolecular interpolating current and calculate the two-point correlation function within the method of QCD sum *** calculations indicate that the masses of the scalar and tensor dibaryon states are mΩΩ,0^(+)=(3.33±0.51)GeV and mΩΩ,2^(+)=(3.15±0.33)GieV,respectively,which are below the 2mΩ*** error,these results do not negate the existence of loosely bound molecularΩΩdibaryon *** exotic strangeness S=-6 and doubly-chargedΩΩdibaryons,if they exist,may be identified in heavy-ion collision processes in the fu-ture.

关键词： QCD sum rules molecular state dibaryon

Bifunctional metal–organic frameworks toward photocatalytic CO2reduction by post-synthetic ligand exchange

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Rare Metals 2019年第5期38卷 413-419页

作者： xiao-hui chen Qin Wei Jin-Dui Hong Rong Xu Tian-Hua Zhou School of Chemical Engineering Fuzhou UniversityFuzhou 350002China School of Chemical and Biomedical Engineering Nanyang Technological UniversitySingapore 637459Singapore State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Photocatalytic reduction of CO2 to useful fuel has been identified as a promising strategy to address the energy and environmental *** of welldefined photocatalysts toward CO2 reduction has attracted increasing interest to gain insight into the reactive ***,by post-synthetic ligand exchange,a bifunctional Re-based metal–organic framework(MOF)was successfully *** not only serves as a photosensitizer but also acts as a catalyst for photochemical reduction of ***,it is found that a Re-based MOF containing 30%Re-based ligands displays improved activity compared to MOF with 100%Re-based *** work provides clues to the design and synthesis of bifunctional MOFs toward photocatalytic CO2 reduction.

关键词： Photocatalysis Metal-organic framework(MOF) CO2 reduction Post-synthesis

An analysis of the mechanism underlying photocatalytic disinfection based on integrated metabolic networks and transcriptional data

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Journal of Environmental Sciences 2020年第6期32卷 28-37页

作者： xiao-Long Liang Zhan-Min Liang Shuo Wang xiao-hui chen Yao Ruan Qing-Ye Zhang Hong-Yu Zhang Hubei Key Laboratory of Agricultural Bioinformatics College of InformaticsHuazhong Agricultural UniversityWuhan430070PR China

Photocatalytic disinfection has long been used to combat pathogenic ***,the specific mechanism underlying photocatalytic disinfection and its corresponding targets remain *** this study,an analysis of the potential mechanism underlying photocatalytic disinfection was performed based on integrated metabolic networks and transcriptional *** sets of RNA-seq data(wild type and a photocatalysis-resistant mutant mediated by titanium dioxide(TiO2))were processed to constrain the genome scale metabolic models(GSMM)of *** analyzing the metabolic network,the differential metabolic flux of every reaction was computed in constrained GSMM,and several significantly differential metabolic fluxes in reactions were extracted and *** of these reactions were involved in the transmembrane transport of substances and occurred on the inner membrane or were an important component of the cell *** results,which are consistent with the reported information,validated our analysis *** addition,our work also identified other new and valuable metabolic pathways,such as the reaction ALCD2x,which has a great effect on the energy production process under bacterial anaerobic *** DHAK reaction is also related to the metabolic process of *** reactions with large differential metabolic fluxes merit further ***,to provide a strategy to address photocatalysis-resistant mutant bacteria,a metabolic compensation analysis was also *** metabolic compensation analysis results provided suggestions for a combined method that can effectively combat resistant *** method could also be used to explore the mechanisms of drug resistance in other microorganisms.

关键词： Photocatalytic disinfection Genome scale metabolic models(GSMM) RNA-seq analysis Mechanism Metabolic compensation

A novel surgical debridement technique for the treatment of Fournier’s gangrene

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Asian Journal of Andrology 2021年第5期23卷 541-542页

作者： xiao-hui chen Peng-Pai Qin Zhong-Xing Zhang Ji-Yan Lin Jing-Jing Zhang Department of Emergency Medicine The First Affiliated Hospital of Xiamen UniversityXiamen 361003China Division No.1 of Surgery Beijing Rectum HospitalBeijing 100035China Department of Cosmetic and Plastic Surgery Zhongshan Hospital Affiliated to Xiamen UniversityXiamen 361005China

Dear Editor,Fourniers gangrene(FG)is a life-threatening disease which is characterized by necrotizing fasciitis of the genital,perianal,and perineal *** was initially found in young healthy males in the late 1800s with the acute onset of fulminant idiopathic genital *** now,FG has been seen in people of different ages,from newborn babies to the elderly3.

关键词： Fournier acute treatment

Authentication and distinction of Shenmai injection with HPLC fingerprint analysis assisted by pattern recognition techniques

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Journal of Pharmaceutical Analysis 2012年第5期2卷 327-333页

作者： Xue-Feng Lu Kai-Shun Bi Xu Zhao xiao-hui chen School of Pharmacy Shenyang Pharmaceutical UniversityWenhua Road 103Shenhe DistrictShenyang 110016China

In this paper, the feasibility and advantages of employing high performance liquid chromatographic （HPLC） fingerprints combined with pattern recognition techniques for quality control of Shenmai injection were investigated and demonstrated. The Similarity Evaluation System was employed to evaluate the similarities of samples of Shenmai injection, and the HPLC generated chromatographic data were analyzed using hierarchical clustering analysis （HCA） and soft independent modeling of class analogy （SIMCA）. Consistent results were obtained to show that the authentic samples and the blended samples were successfully classified by SIMCA, which could be applied to accurate discrimination and quality control of Shenmai injection. Furthermore, samples could also be grouped in accordance with manufacturers. Our results revealed that the developed method has potential perspective for the original discrimination and quality control of Shenmai injection.

关键词： Shenmai injection High performance liquidchromatography Fingerprint Pattern recognition