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Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy

International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 296-304页

作者： Wei Long Song Zhang Yi-long Liang mei-gui ou College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Key Laboratory for Materials Structure and Strength of guizhou province Guizhou UniversityGuiyang 550025China National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology Guizhou UniversityGuiyang 550025China

Duplex-structured TC21 alloy samples were first solution-treated at a higher temperature in theα+βregion(940°C)with furnace cooling(FC),air cooling(AC),and water cooling(WC),followed by a second-stage solution treatment at a lower temperature in theα+βregion(900°C),and then finally aged at 590°*** effects of the morphology and quantity ofαphases on the structure and properties of the TC21 alloy after the different heat treatments were *** in-situ tensile deformation process and crack propagation behavior were observed using scanning electron microscopy(SEM).The quantity of equiaxedαphases as well as the thickness of lamellarαphases reduced,the tensile strength increased firstly and then decreased,the elongation decreased with the increasing cooling rate after the first-stage solution *** amount and size of lamellarαphases increased after the second-stage solution treatment because of sufficient diffusion of the alloying elements,thereby leading to increased tensile *** amount of dispersedαphases increased after the third-stage aging treatment owing to the increase in the nucleation rate,resulting in a noteworthy strengthening *** the third-stage aging treatment,the first-stage FC sample exhibited better mechanical properties because it contained more equiaxedαandβtrans phases than the first-stage AC and WC samples.

关键词： multi-stage heat treatment titanium alloy in-situ tension microstructure mechanical properties

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In situ deformation behavior of TC21 titanium alloy with different α morphologies(equiaxed/lamellar)

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Rare Metals 2021年第5期40卷 1173-1181页

作者： Wei Long mei-gui ou Xi-Qin Mao Yi-Long Liang College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Key Laboratory for Materials Structure and Strength of guizhou Province Guizhou UniversityGuiyang 550025China National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology Guizhou UniversityGuiyang 550025China

To study the effect ofαphase morphology(equiaxedα(αE)/lamellarα(αL))on the in situ tensile behavior of TC21 alloy,the slip band,dislocation,crack initiation,and propagation were analyzed by scanning electron microscopy(SEM)with in situ tensile stage and transmission electron microscopy(TEM).The results show that the slip bands first concentrate in theαE phases and easily truncate at theα/βphase boundaries,whereas the slip bands move across theαlamellae in theαL *** are easily generated inαE orα/βphase boundaries with large plastic *** the quantity ofαL is more thanαE,the crack tip is more easily deflected atαphases orαclusters with different orientations,making the main crack propagation path more *** the volume fraction ratio ofαE toαL is~3:4,i.e.,the volume fraction ofαE is close to that ofαL,TC21 alloy exhibits better strength and slower crack propagation rate.

关键词： In situ tensile TC21 alloy Equiaxed Lamellar αPhase

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Luminescence property and magnetic resonance imaging of Gd_(2)O_(3):Tb^(3+) nanocrystals doped with Zn^(2+),Li^(+)

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Rare Metals 2021年第8期40卷 2049-2058页

作者： Rong Fu Yan-Yan Hu Hui-Na Qiao Chun-Lin Yang Hao Yin mei-gui ou College of Materials and Metallurgy University of GuizhouGuiyang550025China National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology Guiyang550025China College of Chemistry and Materials Engineering Guiyang UniversityGuiyang550003China Department of Neurosurgery Guizhou Provincial People’s HospitalGuiyang550002China

Gd_(2)O_(3):Tb^(3+) nanocrystal co-doped with Zn^(2+)and Li^(+) was prepared by the combination of polyol and solid-phase *** synthesized nanoparticles were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),photoluminescence(PL)spectra and magnetic resonance imaging(MRI).The results revealed that both Gd_(2)O_(3):Tb^(3+)/Zn^(2+) and Gd_(2)O_(3):Tb^(3+)/Li^(+) had cubic unit structures with a spherical shape,and the fluorescence intensity of the nanoparticles reached a maximum at a doping concentration of0.050 mmol%for Zn^(2+) and 2 mol%for Li^(+),*** addition,the T_(1)/T_(2)(longitudinal/transverse relaxation time)-weighted MRI signals got enhanced due to the increased longitudinal relaxivity(r1)and transverse relaxivity(r2)after the doping by metal ***,the materials reported here can be used for fluorescence and MR bimodal imaging,as tracers and for fluorescence detections.

关键词： Gd_(2)O_(3):Tb^(3+) Zn^(2+)/Li^(+)doping Luminescent property Magnetic resonance imaging Nanomaterials

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Numerical Investigation of the Load Distribution between the Main Blade and the Splitter Blade in a High-Loading Centrifugal Compressor

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Journal of Thermal Science 2022年第5期31卷 1682-1695页

作者： ou Jun JIN Donghai gui Xingmin Aeroengine Simulation Research Center School of Energy and Power EngineeringBeihang UniversityBeijing100191China Jiangxi Research Institute of Beihang University Nanchang330096China

In the traditional design of the centrifugal compressor,the splitter blade and the main blade always keep the same ***,to enable high efficiency of the high-loading centrifugal compressor,the matching of design parameters of the splitter blade and the main blade needs to be *** this paper,the influence of the load distribution between the main blade and the splitter blade on the aerodynamic performance,the flow field,and the internal vortices of a high-loading centrifugal compressor were studied by means of CFD *** cases with different values of the variable CR which is defined as the load-ratio of splitter blade to main blade were set *** each case,the splitter blade and the main blade were shaped according to different laws of circulation distribution(_(r)V_(u))while the average circulation of the splitter blade and the main blade at any meridional position were consistent with that of the *** results showed that a proper reduction of the load-ratio of splitter blade to main blade is beneficial to suppress the leakage vortex of the splitter blade and reduce the scale of the wake in the channel near the suction-side of the splitter blade,which consequently improves the flow uniformity at the impeller outlet and enhances the aerodynamic performance of both the stage and the *** stage isentropic efficiency of the optimal case was found to be 0.7%higher than that of the prototype and the stage total pressure ratio was also *** optimal value of CR,which in this investigation is 94%,is supposed to be the result of the trade-off between the development of the wake and the leakage vortices in adjacent two *** optimization of the load distribution between the main blade and the splitter blade provides an opportunity to further improve the high-loading centrifugal compressor performance.

关键词： high-loading centrifugal compressor load distribution performance flow uniformity wake leakage vortex

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An adaptive improvement on PageRank algorithm

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Applied Mathematics(A Journal of Chinese Universities) 2013年第1期28卷 17-26页

作者： LIU gui-mei School of Computer & Computing Science Zhejiang University City College

In this article, we introduce the Google＇s method for quality ranking of web page in a formal mathematical format, use the power iteration to improve the PageRank, and also discuss the effect of different q to the Pa... 详细信息

关键词： PageRank power method adjacency matrix Google matrix.

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Control of Unknown Chaotic Systems Based on Neural Predictive Control

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Communications in Theoretical Physics 2003年第4X期40卷 439-442页

作者： LIDong-mei WANGZheng-ou InstituteofSystemsEngineering TianjinUniversityTianjin300072China SchoolofEconomyandManagement HebeiUniversityofScienceandTechnologyShijiazhuang050018China

We introduce the predictive control into the control of chaotic system and propose a neural network control algorithm based on predictive control. The proposed control system stabilizes the chaotic motion in an unknown chaotic system onto the desired target trajectory. The proposed algorithm is simple and its convergence speed is much higher than existing similar algorithms. The control system can control hyperchaos. We analyze the stability of the control system and prove the convergence property of the neural controller. The theoretic derivation and simulations demonstrate the effectiveness of the algorithm.

关键词：神经预控制未知混沌系统控制神经网络非线性动力学控制模型模拟稳定性分析

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Maps on Positive Cones of C^(*)-algebras

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Acta Mathematica Sinica,English Series 2023年第3期39卷 387-398页

作者： Ming Chu GAO gui mei AN Department of Mathematics Louisiana Christian UniversityPinevilleLA 71359USA School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071P.R.China

We prove that a surjective map(on the positive cones of unital C^(*)-algebras)preserves the minimum spectrum values of harmonic means if and only if it has a Jordan *-isomorphism extension to the whole *** represent weighted geometric mean preserving bijective maps on the positive cones of prime C^(*)-algebras in terms of Jordan *-isomorphisms of the *** also characterize order isomorphisms and orthoisomorphisms of the projection lattice of the von Neumann algebra of all bounded linear operators on a Hilbert space,answering an open question arisen by ***,we give a description for Fuglede-Kadison determinant preserving maps on the positive cone of a finite von Neumann algebra and improve Gaal and Nayak’s work on this topic.

关键词： Operator means preserving maps positive cones projection lattices Fuglede-Kadison Determinants

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Genetic basis and biotechnological manipulation of sexual dimorphism and sex determination in fish

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Science China(Life Sciences) 2015年第2期58卷 124-136页

作者： mei Jie gui Jian-Fang College of Fisheries Key Laboratory of Freshwater Animal Breeding Ministry of Agriculture Freshwater Aquaculture Collaborative Innovation Center of Hubei Province Huazhong Agricultural University State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences University of the Chinese Academy of Sciences

Aquaculture has made an enormous contribution to the world food production,especially to the sustainable supply of animal *** utility of diverse reproduction strategies in fish,such as the exploiting use of unisexual gynogenesis,has created a typical case of fish genetic breeding.A number of fish species show substantial sexual dimorphism that is closely linked to multiple economic traits including growth rate and body size,and the efficient development of sex-linked genetic markers and sex control biotechnologies has provided significant approaches to increase the production and value for commercial *** with the rapid development of genomics and molecular genetic techniques,the genetic basis of sexual dimorphism has been gradually deciphered,and great progress has been made in the mechanisms of fish sex determination and identification of sex-determining *** review summarizes the progress to provide some directive and objective thinking for further research in this field.

关键词： reproduction strategies sexual dimorphism sex determination sex-determining gene sex chromosome sex controlbreeding

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Instant Edit Propagation on Images Based on Bilateral Grid

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Computers, Materials & Continua 2019年第8期61卷 643-656页

作者： Feng Li Chaofeng ou Yan gui Lingyun Xiang Hunan Provincial Key Laboratory of Intelligent Processing of Big Data on Transportation Changsha University of Science and TechnologyChangsha410114China School of Computer and Communication Engineering Changsha University of Science and TechnologyChangsha410114China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore639798Singapore

The ability to quickly and intuitively edit digital content has become increasingly important in our everyday ***,existing edit propagation methods for editing digital images are typically based on optimization with high computational cost for large ***,existing edit propagation methods are generally inefficient and highly ***,to improve edit efficiency,this paper proposes a novel edit propagation method using a bilateral grid,which can achieve instant propagation of sparse image ***,given an input image with user interactions,we resample each of its pixels into a regularly sampled bilateral grid,which facilitates efficient mapping from an image to the bilateral *** a result,all pixels with the same feature information(color,coordinates)are clustered to the same grid,which can achieve the goal of reducing both the amount of image data processing and the cost of *** then reformulate the propagation as a function of the interpolation problem in bilateral space,which is solved very efficiently using radial basis *** results show that our method improves the efficiency of color editing,making it faster than existing edit approaches,and results in excellent edited images with high quality.

关键词： Instant edit propagation bilateral grid radial basis function image editing

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How to Recognize Nonexpansive Mappings and Isometric Mappings

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Acta Mathematica Sinica,English Series 2011年第10期27卷 1959-1966页

作者： Guang gui DING Yu mei MA School of Mathematical Sciences and LPMC Nankai University Tianjin 300071 P. R. China Department of Applied Mathematics Dalian Nationality University Liaoning 116600 P. R. China

In two real Banach spaces, we shall present two conditions, under one of which each nonexpansive mapping must be an isometry.

关键词： Nonexpansive mapping smooth point weak*-compact set

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