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Fabrication of multi-scale TiC and stainless steel composite coatings via circular oscillating laser towards superior wear and corrosion resistance of aluminum alloy

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Journal of Materials Science & Technology 2024年第10期177卷 191-204页

作者： Fan Cao Hongzhi Cui Xiaojie Song Lin Gao Minglei Liu qing qiao Hongyuan Kong School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

The poor wear and corrosion resistance of aluminum alloys has led to the easy failure of surface *** this work,composite coatings of TiC/martensitic stainless steel(TiC/MSS)on aluminum alloy are fabricated by a novel approach of circular oscillating laser for enhanced surface performance of alu-minum *** oscillation of laser leads to dense microstructure,and nano/micro scale TiC particles are formed *** structure of coatings transforms from dendritic to ring-like with the ad-dition of TiC,and the hardness of the substrate is increased by 4.5-7.8 *** main wear form of coatings is adhesive *** refinement of microstructure and formation of multi-scale TiC have given rise to an increase in the resistance of the coating to plastic deformation,which reduces the degree of adhesion and improves wear ***,the barrier effect of TiC particles to the electrolyte solu-tion in the passive film gives rise to the drop in corrosion current *** Cr-rich stacking faults can provide nucleation sites for the formation and growth of passive films with high continuity and stability,thereby improving the corrosion resistance of the *** superior anticorrosion and wear resis-tance properties of the composite coatings in this work have emphasized the merits of oscillating laser in fabricating high-performance coatings and would enlighten the design of more advanced composite coatings.

关键词： Multi-scale TiC Coating Wear resistance Corrosion resistance Circular oscillating laser

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Spectrophotometric Determination of Trace Chromium(VI) in Mass Chromium(III)

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Chinese Chemical Letters 2001年第7期12卷 635-636页

作者： Zi gang XU Xian Hong WEN qing Zhou WU Center of Analysis&Testing Zhejiang UniversityHangzhou 310027

The method for the sepration and determination of trace Cr(VI) exiting in mass Cr(III) has been researched. The method is highly sensitive and less interference, but is simple and useful for analysis trace Cr(VI).

关键词： Spectrophotometric Cr(VI) Cr(III) diphenyl carbazide(DPC) 4-methyl-benzene sulfonic acid

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Controllable Construction of Bifunctional CoxP@N,P-Doped Carbon Electrocatalysts for Rechargeable Zinc–Air Batteries

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Energy & Environmental Materials 2022年第2期5卷 515-523页

作者： qing Shi qiao Liu Yapeng Zheng Yaqian Dong Lin Wang Hantao Liu Weiyou Yang Institute of Materials Ningbo University of TechnologyNingbo 315211China School of Energy and Power Engineering North University of ChinaTaiyuan 030051China

The exploration of cheap,efficient,and durable bifunctional electrocatalysts for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is highly desired to push forward the commercialization of rechargeable ... 详细信息

关键词： oxygen evolutionreaction oxygenreductionreaction transitionmetal phosphides Zn-air batteries

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Exopolysaccharides from lactic acid bacteria,as an alternative to antibiotics,on regulation of intestinal health and the immune system

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Animal Nutrition 2023年第2期13卷 78-89页

作者： Shuo Yang Xiaoqing Xu qing Peng Lan Ma Yu qiao Bo Shi Feed Research Institute Chinese Academy of Agricultural SciencesBeijing100081China

Over-use or misuse of antibiotics in livestock and poultry production contributes to the rising threat of antibiotic resistance in animals and has negative ecological *** from lactic acid bacteria(LAB-EPS)are a class of biological macromolecules which are secreted by lactic acid bacteria to the outside of the cell wall during their growth and *** studies demonstrated that LAB-EPS have anti-inflammatory and antimicrobial activities and are able to regulate intestinal health and the immune system in *** are biodegradable,nontoxic and bio-compatible,which are considered as ideal alternatives to *** review aims to discuss and summarize recent research findings of LAB-EPS on regulation of intestinal health and the immune system in animals,and thus provide scientific justification for commercial applications of LAB-EPS in livestock.

关键词： Lactic acid bacteria Exopolysaccharides Intestinal health Immune function

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Atomically precise alkynyl-protected Ag_(20)Cu_(12)nanocluster:Structure analysis and electrocatalytic performance toward nitrate reduction for NH_(3)synthesis

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Nano Research 2023年第8期16卷 10867-10872页

作者： Guanyu Ma Fang Sun Liang qiao Quanli Shen Lei Wang qing Tang Zhenghua Tang New Energy Research Institute School of Environment and EnergySouth China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou 510006China School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Theoretical and Computational ChemistryChongqing UniversityChongqing 401331China China Petrochemical Research Institute PetroChina Company LimitedBeijing 102206China

Electrochemical nitrate reduction reaction(NtrRR)has been emerging as an appealing route for both water treatment and NH_(3)***,we report the structure analysis and electrocatalytic performance of a novel homoleptic alkynyl-protected Ag_(20)Cu_(12)nanocluster(Ag_(20)Cu_(12)in short)with atomic precision,which has eight free electrons and displays characteristic absorbance *** crystal X-ray diffraction(SC-XRD)discloses that,it adopts a Ag_(14)kernel capped by three Ag_(2)Cu_(4)(C≡CArF)_(8)metal–ligand binding motifs in the outer ***_(20)Cu_(12)exhibited excellent catalytic performance toward NtrRR,as manifested by the superior NH_(3)Faradaic efficiency(FE,84.6%)and yield rate(0.138 mmol·h^(−1)·mg−1)than the homoleptic alkynyl-protected Ag_(32)***,it demonstrates good catalytic recycling *** functional theory(DFT)calculations revealed that,the de-ligated Ag_(20)Cu_(12)cluster can expose the available AgCu bimetallic sites as the efficient active sites for NH_(3)*** particular,the participation of Cu sites greatly facilitates the initial capture of NO_(3)−and simultaneously promotes the selectivity of the final *** study discovers a novel homoleptic alkynyl-protected AgCu superatom,and offers a great example to elucidate the structure–performance relationship of bimetallic catalyst for NtrRR and other multiple protons/electrons coupled electrocatalytic reactions.

关键词： Ag_(20)Cu_(12)nanocluster alkynyl ligand nitrate reduction reaction(NtrRR) ammonia synthesis density functional theory(DFT)calculations

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MIBK Removal from Aqueous Solution by Aeration method

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Journal of Central South University 2000年第4期12卷 182-185页

作者： LI qing-gang ZHOU Kang-gen ZHANG Qi-xiu Metallurgical Separation Science and Engineering Lab. Central South UniversityChangsha 410083China

In order to develop an effective MIBK removal method of H 2TaF 7 solution in tantalum extraction process, MIBK removal from aqueous solution by the aeration method was investigated by using an aeration column with the dimensions of 78 mm in inner diameter and 1 100 mm in length. The effects of aeration conditions on aerating efficiency were investigated in the ranges of temperature 303 333 K, airflow rate 50 300 L/h,volume of solution 1 600 3 200 mL. Aerating efficiency increases with the increase of temperature and airflow rate. MIBK in aqueous solution can be removed from 0.058 mol/L to 0.002 mol/L at 50 ℃,airflow rate 200 L/h, volume of solution 2 400 mL and aeration time 1h. The experimental results show that MIBK can be removed effectively from aqueous solution by the aeration method.

关键词： tantalum niobium MIBK removal aeration method

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Hydrothermal Synthesis and Crystal Structure of Manganese(Ⅱ) Coordination Polymer Assembled by 4-Sulfophthalate and 4,4′-Bipyridine

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Chemical Research in Chinese Universities 2007年第1期23卷 105-108页

作者： WANG qing-wei LI Xiu-mei GAO Guang gang Department of Chemistry Jilin Normal University Siping 136000 P. R. China Department of Chemistry Tonghua Teachers College Tonghua 134002 P.R. China

The rational design and synthesis of metal-directed supramolecular framework compounds have received much attention in coordination chemistry because of their potential applications in catalysis, molecular selection, nonlinear optics, ion exchange, and microelectronics. Many high-dimensional coordination complexes have been designed and prepared through molecular self-assembly processes. The open metal organic framework can be produced via two kinds of interactions, i. e. , coordinate covalent bonds and weaker intermolecular forces. For this reason, the most efficient means to synthesize these compounds is to establish possible connections among different units.

关键词： Hydrothermal synthesis Crystal structure Supramoleeular network Mixed ligand

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Simulation and analysis of the carrying capacity for road networks using a grid-based approach

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第4期7卷 498-506页

作者： Junqing Shi Linwu Chen Fengxiang qiao Lei Yu qing Li Guilian Fan College of Engineering Zhejiang Normal UniversityJinhua 321004China Innovative Transportation Research Institute Texas Southern UniversityHoustonTX 77004USA Xuchang University Xuchang 461000China Beijing Jiaotong University Beijing 100044China Wuhan Transportation Science Research Institute Wuhan 430015China

The number of vehicles that a road network can carry is *** the limit is exceeded,the network system is not able to function *** this paper,an updated cellular automaton model for grid networks with all-way stop-controlled intersections is proposed to simulate the network level critical density and carrying capacity under different conditions,which essentially indicates the limit number of vehicles that the network can handle before going into *** the proposed model,two update rules,including lane-changing and the longitudinal location update,are adopted to describe the vehicle’s movements on road segments according to the driving condition on the road and the vehicle’s direction in the downstream *** vehicle’s movements in intersection areas are prioritized based on vehicle’s position,so as to prevent collisions within the intersection *** simulation results show that an increase in network size is able to expand the carrying capacity of a road network,whereas the expansion rate is lower than the change rate in the network *** carrying capacity is also associated with the structure of road *** carrying capacity is inversely proportional to the number of intersections,and proportional to the length of the road in the ***,optimizing the origin-destination(O-D)distribution can increase the carrying capacity of an urban road network.

关键词： Transportation Grid road network Carrying capacity Congestion Critical density Cellular automata model

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Influence of resonator diameter on a miniature thermoacoustic Stirling heat engine

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Chinese Science Bulletin 2008年第1期53卷 145-154页

作者： ZHOU gang LI qing LI ZhengYu LI Qiang Cryogenics Laboratory Huazhong University of Science and Technology Wuhan 430074 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100080 China

A small scale thermoacoustic Stirling engine (TASHE) is simulated according to the linear ther-moacoustic theory. The computed results show that in a small scale thermoacoustic Stirling heat en-gine, the diameter of the resonance tube might have important influences on the working frequency and the performance of the engine, which are always neglected in a large scale system. Likewise, the analysis and experimental results show that in order to obtain better engine performance, the diameter of the resonance tube must be chosen appropriately according to the looped tube dimension and the input heating power. This provides an effective way to miniaturize the thermoacoustic Stirling heat en-gine. According to the computation and analysis, a small scale engine was built, the resonance tube length and diameter of which were about 350 mm and 20 mm, respectively, and the working frequency was about 282 Hz. When the input heating power was about 637 W, the maximal peak to peak pressure amplitude and pressure ratio reached 0.22 MPa and 1.116, respectively, which were able to drive a thermoacoustic refrigerator or an electrical generator.

关键词：声学共振器谐振管相位转移

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Refined mathematical model for the breaching of concrete-face sand-gravel dams due to overtopping failure

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Journal of Mountain Science 2023年第3期20卷 670-687页

作者： QIU Wen LI Yan-long WEN Li-feng WANG Jing YIN qiao-gang State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyXi'an 710048China

Overtopping is one of the main reasons for the breaching of concrete-face sand-gravel dams(CFSGDs).In this study,a refined mathematical model was established based on the characteristics of the overtopping breaching of *** model characteristics were as follows:(1)Based on the Renormailzation Group(RNG)k-εturbulence theory and volume of fluid(VOF)method,the turbulent characteristics of the dam-break flow were simulated,and the erosion surface of the water and soil was tracked;(2)In consideration of the influence of the change in the sediment content on the dam-break flow,the dam material transport equation,which could reflect the characteristics of particle settlement and entrainment motion,was used to simulate the erosion process of the sand gravels;(3)Based on the bending moment balance method,a failure equation of the concrete face slab under dead weight and water load was *** proposed model was verified through a case study on the failure of the Gouhou *** results showed that the proposed model could well simulate the erosion mode of the special vortex flow of the CFSGD scouring the support body of the concrete face slab inward and reflect the mutual coupling relationship between the dam-break flow,sand gravels,and concrete face *** with the measured values,the relative errors of the peak discharge,final breach average width,dam breaching duration,and maximum failure length of the face slab calculated using the proposed model were all less than 12%,thus verifying the rationality of the *** proposed model was demonstrated to perform better and provide more detailed results than three selected parametric models and three simplified mathematical *** study results can aid in establishing the risk level and devising early warning strategies for CFSGDs.

关键词： Concrete-face sand-gravel dam Overtopping Dam-break flow Concrete face slab failure Refined mathematical model

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