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Behavior of NiCrAlY coating on the TC6 titanium alloy

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Journal of University of Science and Technology Beijing 2008年第2期15卷 167-172页

作者： Changqing Xia xiaomin Peng Jia li School of Materials Science and Engineering Central South University Changsha 410083 China

A NiCrAlY coating was deposited on the TC6 titanium substrate by arc ion plating （ALP）. The structure and morphologies of the NiCrAlY coating were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）, and the influence of vacuum heat treatment on the element diffusion behavior was studied. The results showed that the y＇-Ni3Al phase was precipitated on the NiCrAlY coating after heat treatment. The Ni3（AI,Ti）, TiNi, and Ti2Ni intermetallic layers appeared at the interface from the outside to the inside at 700℃, and the thickness of the intermetallic layers increased with the increase in temperature. At 700℃ Ti and Ni were the major diffusion elements, and the diffusion of Cr was observed when the heat treatment temperature increased up to 870℃. The violent inward diffusion of Ni at 950℃ resulted in the degradation of the NiCrAlY coating.

关键词： NiCrAlY coating TC6 titanium alloy vacuum heat treatment microstructure interdiffusion

Transcriptomics and physiological analyses reveal that sulfur alleviates mercury toxicity in rice(Oryza sativa L.)

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Journal of Environmental Sciences 2024年第1期135卷 10-25页

作者： Yingmei Huang Jicai Yi xiaomin li Fangbai li National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and ManagementInstitute of Eco-Environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China College of life Sciences South China Agricultural UniversityGuangzhou 510642China SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China

Mercury(Hg)is one of the most dangerous contaminants and has sparked global concern since it poses a health risk to humans when consumed through ***(S)is a crucial component for plant growth,and S may reduce Hg accumulation in rice ***,the detailed effects of S and the mechanisms underlying S-mediated responses in Hg-stressed rice plants remain ***,to investigate the effects of S addition on rice growth,Hg accumulation,physiological indexes,and gene expression profiles,rice seedlings were hydroponically treated with Hg(20μmol/L Hg Cl_(2))and Hg plus elemental sulfur(100 mg/L).S application significantly reduced Hg accumulation in Hg-stressed rice roots and alleviated the inhibitory effects of Hg on rice growth.S addition significantly reduced Hg-induced reactive oxygen species generation,membrane lipid peroxidation levels,and activities of antioxidant enzymes while increasing glutathione content in *** analysis of roots identified 3,411,2,730,and 581 differentially expressed genes in the control(CK)***,CK ***+S,and Hg ***+S datasets,*** pathway of S-mediated biological metabolism fell into six groups:biosynthesis and metabolism,expression regulation,transport,stimulus response,oxidation reduction,and cell wall *** majority of biological process-related genes were upregulated under Hg stress compared with CK treatment,but downregulated in the Hg+S *** results provide transcriptomic and physiological evidence that S may be critical for plant Hg stress resistance and will help to develop strategies for reduction or phytoremediation of Hg contamination.

关键词： Sulfur Mercury Transcriptomics Detoxification

Solid Electrolyte Interface in Zn-Based Battery Systems

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Nano-Micro Letters 2022年第12期14卷 286-309页

作者： Xinyu Wang xiaomin li Huiqing Fan Longtao Ma Frontiers Science Center for Flexible Electronics Institute of Flexible ElectronicsNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China

Due to its high theoretical capacity(820 mAh g^(−1)),low standard electrode potential(−0.76 V ***),excellent stability in aqueous solutions,low cost,environmental friendliness and intrinsically high safety,zinc(Zn)-based batteries have attracted much attention in developing new energy storage *** Zn battery system,the battery performance is significantly affected by the solid electrolyte interface(SEI),which is controlled by electrode and electrolyte,and attracts dendrite growth,electrochemical stability window range,metallic Zn anode corrosion and passivation,and electrolyte ***,the design of SEI is decisive for the overall performance of Zn battery *** paper summarizes the formation mechanism,the types and characteristics,and the characterization techniques associated with ***,we analyze the influence of SEI on battery performance,and put forward the design strategies of ***,the future research of SEI in Zn battery system is prospected to seize the nature of SEI,improve the battery performance and promote the large-scale application.

关键词： Solid electrolyte interface Zn-based battery Solvated structure Artificial SEI In situ SEI

Coupled Cross-Flow/in-line Vortex-Induced Vibration Responses of a Catenary-Type Riser Subjected to Uniform Flows

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Journal of Ocean University of China 2024年第5期23卷 1202-1212页

作者： li xiaomin CAO Xi li Fuheng YANG Zhiwen College of Engineering Ocean University of ChinaQingdao 266404China College of Hydrodynamic Engineering Tianjin Research Institute for Water Transport EngineeringM.O.TTianjin 300456China

A three-dimensional numerical scheme was developed to investigate the vortex-induced vibration(VIV)of a catenary-type riser(CTR)in the in-line(IL)and cross-flow(CF)*** using the vector form intrinsic finite element method,the CTR was discretized into a finite number of spatial particles whose motions satisfy Newton’s second *** Van der Pol oscillator was used to simulate the effect of vortex *** coupling equations of structural vibration and wake oscillator were solved using an explicit central differential *** numerical model was verified with the published *** VIV characteristics of the CTR subjected to uniform flows,including displacement,frequency,standing wave,traveling wave,motion trajectory,and energy transfer,were studied *** numerical results revealed that the multimode property occurs in the CF-and IL-direction VIV responses of the *** increase in the flow velocity has slight effects on the maximum VIV *** to structural nonlin-earity,the double-frequency relationship in the CF and IL directions is rarely ***,the vibration trajectories display the shape of an inclined elliptical ***,the negative energy region is inconspicuous under the excitation of the uniform flow.

关键词： vortex-induced vibration vector form intrinsic finite element catenary-type riser wake oscillator equation

Recent Progress on Asymmetric Carbon- and Silica-Based Nanomaterials: From Synthetic Strategies to Their Applications

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Nano-Micro Letters 2022年第3期14卷 134-168页

作者： Haitao li liang Chen xiaomin li Daoguang Sun Haijiao Zhang Institute of Nanochemistry and Nanobiology Shanghai UniversityShanghai 200444People’s Republic of China Department of Chemistry Laboratory of Advanced NanomaterialsShanghai Key Laboratory of Molecular Catalysis and Innovative NanomaterialsState Key Laboratory of Molecular Engineering of PolymersCollaborative Innovation Center of Chemistry for Energy Nanomaterials(2011‑iChEM)Fudan UniversityShanghai 200433People’s Republic of China

Carbon-and silica-based nanomaterials possess a set of merits including large surface area,good structural stability,diversified morphology,adjustable structure,and *** outstanding features make them widely applied in different ***,limited by the surface free energy effect,the current studies mainly focus on the symmetric structures,such as nanospheres,nanoflowers,nanowires,nanosheets,and core-shell structured *** comparison,the asymmetric structure with ingenious adjustability not only exhibits a larger effective surface area accompanied with more active sites,but also enables each component to work independently or corporately to harness their own merits,thus showing the unusual performances in some specific *** current review mainly focuses on the recent progress of design principles and synthesis methods of asymmetric carbon-and silica-based nanomaterials,and their applications in energy storage,catalysis,and ***,we provide some deep insights into their unique advantages in related fields from the perspective of materials’structure-performance ***,the challenges and development prospects on the synthesis and applications of asymmetric carbon-and silica-based nanomaterials are also presented and highlighted.

关键词： Carbon-and silica-based nanoparticles Asymmetric structure Synthetic strategies Energy storage and conversion Biomedicine

Identification of potential electrotrophic microbial community in paddy soils by enrichment of microbial electrolysis cell biocathodes

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Journal of Environmental Sciences 2020年第1期32卷 411-420页

作者： xiaomin li Longjun Ding Haiyan Yuan xiaoming li Yongguan Zhu State Key Lab of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesShuangqing RoadNo.18Haidian DistrictBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Key Lab of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesJimei RoadNo.1799Jimei DistrictXiamen 361021China

Electrotrophs are microbes that can receive electrons directly from cathode in a microbial electrolysis cell(MEC).They not only participate in organic biosynthesis,but also be crucial in cathode-based ***,little is known about the electrotrophic community in paddy ***,the putative electrotrophs were enriched by cathodes of MECs constructed from five paddy soils with various properties using bicarbonate as an electron acceptor,and identified by 16S rRNA-gene based Illumina *** electrons were gradually consumed on the cathodes,and 25%–45% of which were recovered to reduce bicarbonate to acetic acid during MEC *** was the dominant bacterial phylum on the cathodes,and Bacillus genus within this phylum was greatly enriched and was the most abundant population among the detected putative electrotrophs for almost all ***,several other members of Firmicutes and Proteobacteria may also participate in electrotrophic process in different *** pH,amorphous iron and electrical conductivity significantly influenced the putative electrotrophic bacterial community,which explained about 33.5% of the community structural *** study provides a basis for understanding the microbial diversity of putative electrotrophs in paddy soils,and highlights the importance of soil properties in shaping the community of putative electrotrophs.

关键词： Electrotroph Paddy soil Microbial electrolysis cell Microbial community Soil property

Different effects of foliar application of silica sol on arsenic translocation in rice under low and high arsenite stress

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Journal of Environmental Sciences 2021年第7期33卷 22-32页

作者： Dandan Pan Chuanping liu Jicai Yi xiaomin li Fangbai li SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China School of Environment South China Normal UniversityGuangzhou 510006China College of life Sciences South China Agricultural UniversityGuangzhou 510642China

Foliar application of Si can generally reduce As translocation from roots to shoots in rice;however, it does not always work, particularly under high As stress. Here, the effects of foliar application of nanoscale silica sol on As accumulation in rice were investigated under low(2 μmol/L) and high(8 μmol/L) arsenite stress. The results revealed that foliar Si application significantly decreased the As concentration in shoots under low arsenite stress, but showed different effects under high arsenite stress after 7 days of incubation. The reduction in root-to-shoot As translocation under the 2 As + Si treatment was related to the down-regulation of Os Lsi1 and Os Lsi2 expression and up-regulation of Os ABCC1 expression in roots. In the 8 As + Si treatment, the expressions of Os Lsi1, Os Lsi2, and Os ABCC1 were significantly promoted, which resulted in substantially higher As accumulation in both the roots and shoots. In the roots, As predominantly accumulated in the symplasts(90.6%–98.3%), in which the majority of As was sequestered in vacuoles(79.0%–94.0%) under both levels of arsenite stress. Compared with that of the 8 As treatment, the 8 As + Si treatment significantly increased the As concentration in cell walls, but showed no difference in the vacuolar As concentration, which remained constant at approximately 69.1–71.7 mg/kg during days 4–7. It appeared that the capacity of root cells to sequester As in the vacuoles had a threshold, and the excess As tended to accumulate in the cell walls and transfer to the shoots via apoplasts under high arsenite stress. This study provides a better understanding of the different effects of foliar Si application on As accumulation in rice from the view of arseniterelated gene expression and As subcellular distribution in roots.

关键词： Gene expression Apoplast Symplast Vacuolar sequestration Cell wall

Vector form Intrinsic Finite Element Method for the Two-Dimensional Analysis of Marine Risers with Large Deformations

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Journal of Ocean University of China 2018年第3期17卷 498-506页

作者： li xiaomin GUO Xueli GUO Haiyan College of Engineering Ocean University of China

Robust numerical models that describe the complex behaviors of risers are needed because these constitute dynamically sensitive systems. This paper presents a simple and efficient algorithm for the nonlinear static and dynamic analyses of marine risers. The proposed approach uses the vector form intrinsic finite element(VFIFE) method, which is based on vector mechanics theory and numerical calculation. In this method, the risers are described by a set of particles directly governed by Newton's second law and are connected by weightless elements that can only resist internal forces. The method does not require the integration of the stiffness matrix, nor does it need iterations to solve the governing equations. Due to these advantages, the method can easily increase or decrease the element and change the boundary conditions, thus representing an innovative concept of solving nonlinear behaviors, such as large deformation and large displacement. To prove the feasibility of the VFIFE method in the analysis of the risers, rigid and flexible risers belonging to two different categories of marine risers, which usually have differences in modeling and solving methods, are employed in the present study. In the analysis, the plane beam element is adopted in the simulation of interaction forces between the particles and the axial force, shear force, and bending moment are also considered. The results are compared with the conventional finite element method(FEM) and those reported in the related literature. The findings revealed that both the rigid and flexible risers could be modeled in a similar unified analysis model and that the VFIFE method is feasible for solving problems related to the complex behaviors of marine risers.

关键词： marine riser vector form intrinsic finite element (VFIFE) static analysis dynamic analysis geometric nonlinearity

Numerical analysis of capacitive pressure micro-sensors

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Science China(Technological Sciences) 2005年第2期48卷 202-213页

作者： WANG xiaomin li Mingxuan WANG Chenghao Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China

Pseudo-spectral method is used to numerically model the diaphragm deflection of capacitive pressure micro-sensor under uniform load. The relationship between the capacitance of the micro-sensor and the load is then analyzed after the description of the computational principle. For normal mode micro-sensor, the tensile force on the diaphragm can be ignored and thereby the capacitance increases linearly with the load increase only when the load is so small that the resultant deflection is less than the diaphragm thickness. The linear relationship between the capacitance and the load turns to be nonlinear thereafter and the capacitance rises dramatically with the constant increase of the load. For touch mode micro-sensor, an algorithm to determine the touch radius of the diaphragm and substrate is presented and the curve of capacitance versus load is shown on the numerical results laying a theoretical foundation for micro-sensor design.

关键词： pseudo-spectral method, capacitive pressure micro-sensor, capacitance vs. load.