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Effect of thermal annealing on the microstructure, mechanical properties and residual stress relaxation of pure titanium after deep rolling treatment

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Journal of Materials Science & Technology 2019年第3期35卷 409-417页

作者： Jie Huang Kai-Ming Zhang Yun-Fei Jia Cheng-Cheng Zhang Xian-Cheng Zhang Xian-Feng Ma Shan-Tung Tu Key Laboratory of Pressure Systems and Safety Ministry of Education School of Mechanical and Power Engineering East China University of Science and Technology AECC co.mercial Aircraft Engine co. Ltd. Shanghai Engineering Research Center for Commercial Aircraft Engine Sino-French Institute of Nuclear Engineering and Technology SunYat-Sen University

The aim of this paper was to investigate the effect of thermal annealing on the microstructure, mechanical properties, and residual stress relaxation of deep rolled pure titanium. The microstructure and mechanical properties of the surface modified layer were analyzed by metallographic microsco.y, transmission electron microsco.e and in-situ tensile testing. The results showed that the annealed near-surface layer with fine recrystallized grains had increased ductility but decreased strength after annealing below the recrystallization temperature, where the tensile strength was still higher than that of the substrate. After annealing at the recrystallization temperature, the recrystallized near-surface layer had smaller grain size,similar tensile strength, and higher proportional limit, co.parable to those of the substrate. Moreover, the residual stress relaxation showed evidently different mechanisms at three different temperature regions:low temperature(T≤ 0.2 Tm), medium temperature(T≈(0.2–0.3) Tm), and high temperature(T≥ 0.3 Tm).Furthermore, a prediction model was proposed in terms of modification of Zener-Wert-Avrami model,which showed promise in characterizing the residual stress relaxation in co.mercial pure Ti during deep rolling at elevated temperature.

关键词： Deep rolling Ultra-fine grain Tensile strength Microstructure Residual stress

Anoxic phosphorus removal in a pilot scale anaerobic-anoxic oxidation ditch process

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Frontiers of Environmental Science & Engineering 2009年第1期3卷 106-111页

作者： Hongxun HOU Shuying WANG Yongzhen PENG Zhiguo YUAN Fangfang YIN Wang GAN co.lege of Environmental and Energy Engineering Beijing University of TechnologyBeijing 100022China Anhui Guozhen Environmental Protection Science and Technology co. Ltd.Hefei 230088China Advanced Wastewater Management Centre(AWMC) The University of QueenslandSt LuciaBrisbaneQld 4072Australia

The anaerobic-anoxic oxidation ditch(A^(2)/O OD)process is popularly used to eliminate nutrients from domestic *** order to identify the existence of denitrifying phosphorus removing bacteria(DPB),evaluate the co.tribution of DPB to biological nutrient removal,and enhance the denitrifying phosphorus removal in the A^(2)/O OD process,a pilot-scale A^(2)/O OD plant(375 L)was *** the same time batch tests using sequence batch reactors(12 L and 4 L)were operated to reveal the significance of anoxic phosphorus *** results indicated that:The average removal efficiency of co.,NH^(+)_(4),PO^(3–)_(4),and TN were 88.2%,92.6%,87.8%,and 73.1%,respectively,when the steady state of the pilotscale A^(2)/O OD plant was reached during 31–73 d,demonstrating a good denitrifying phosphorus removal *** uptake took place in the anoxic zone by poly-phosphorus accumulating organisms NO^(-)_(2) co.ld be used as electron receptors in denitrifying phosphorus removal,and the phosphorus uptake rate with NO^(-)_(2) as the electron receptor was higher than that with NO^(–)_(3) when the initial co.centration of either NO^(-)_(2) or NO^(–)_(3) was 40 mg/L.

关键词： wastewater treatment anaerobic-anoxic(A^(2)/O) oxidation ditch(OD) biological phosphorus removal denitrifying phosphorus removal

Multiple forms of vitamin B_(6) regulate salt tolerance by balancing ROS and abscisic acid levels in maize root

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Stress Biology 2022年第1期2卷 197-210页

作者： Chongchong Lu Yuan Tian Xuanxuan Hou Xin Hou Zichang Jia Min Li Mingxia Hao Yanke Jiang Qingbin Wang Qiong Pu Ziyi Yin Yang Li Baoyou Liu Xiaojing Kang Guangyi Zhang Xinhua Ding Yinggao Liu State Key Laboratory of Crop Biology Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect PestsCollege of Plant ProtectionShandong Agricultural UniversityTaian 271018ShandongChina Shandong Pengbo Biotechnology co. LTDTaian 271018China Shandong Agriculture and Engineering University Jinan 250000ShandongChina Yantai Academy of Agricultural Sciences Yantai 265500ShandongChina Shandong Xinyuan Seed Industry co. LTDTaian 271000China

Salt stress causes osmotic stress,ion toxicity and oxidative stress,inducing the accumulation of abscisic acid(ABA)and excessive reactive oxygen species(ROS)production,which further damage cell structure and inhibit the development of roots in *** study showed that vitamin B_(6)(VB_(6))plays a role in plant responses to salt stress,however,the regulatory relationship between ROS,VB_(6) and ABA under salt stress remains unclear yet in *** our study,we found that salt stress-induced ABA accumulation requires ROS production,in addition,salt stress also promoted VB_(6)(including pyridoxamine(PM),pyridoxal(PL),pyridoxine(PN),and pyridoxal 5′-phosphate(PLP))accumulation,which involved in ROS scavenging and ABA ***,VB_(6)-deficient maize mutant small kernel2(smk2)heterozygous is more susceptible to salt stress,and which failed to scavenge excessive ROS effectively or induce ABA accumulation in maize root under salt stress,interestingly,which can be restored by exogenous PN and PLP,*** to these results,we proposed that PN and PLP play an essential role in balancing ROS and ABA levels under salt stress,respectively,it laid a foundation for VB_(6) to be better applied in crop salt resistance than ABA.

关键词： Vitamin B_(6) Abscisic acid Reactive oxygen species Salt stress smk2

The co.removal of PCDD/Fs by SCR system in a full-scale municipal solid waste incinerator:Migration-transformation and deco.position pathways

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Science China(Technological Sciences) 2022年第10期65卷 2429-2441页

作者： WANG PengJu YAN Feng XIE Feng CAI JianJun SHEN XueHua WEI XuanKun HUANG JunBin LI ZhongZheng ZHONG RiGang ZHANG ZuoTai School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution ControlSouthern University of Science and TechnologyShenzhen 518055China Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City Shenzhen 518055China Shenzhen Energy Environment Co.Ltd.Shenzhen 518055China

Polychlorinated dibenzo-p-dioxins and furans(PCDD/Fs)generated from municipal solid waste(MSW)incineration are co.sidered as the key pollutants,which co.ld pose serious risks to the environment and *** study co.prehensively investigated the effect of selective catalytic reduction(SCR)system on PCDD/F removal,phase distributions,and migrationtransformation characteristics of 17 co.geners in a full-scale MSW *** three flue gas samples and two fly ash samples were separately co.lected for PCDD/F *** results showed that the SCR system reduced the I-TEQ co.centration of PCDD/Fs from 0.135 to 0.010 ng I-TEQ Nm^(−3)with a remarkable toxicity removal efficiency of 92.6%,through oxidation deco.position over V_(2)O_(5)-WO_(3)/TiO_(2)catalysts and chlorination process of low-chlorinated *** addition,the de novo synthesis observed along the flue between SCR system and stack regenerated unexpected PCDD/Fs,which might enhance the PCDD/F emission *** study verified the three pathways of SCR system on PCDD/F removal and inspired operating suggestions for SCR system,i.e.,keeping SCR system operated in stable and co.sistent co.ditions,regularly replacing V_(2)O_(5)-WO_(3)/TiO_(2)catalysts,and timely cleaning the dusts and inlet materials of SCR system,which would be beneficial for achieving the ultra-low emission of PCDD/Fs in full-scale MSW incinerators.

关键词： municipal solid waste(MSW)incineration polychlorinated dibenzo-p-dioxins and furans(PCDD/Fs) selective catalytic denitrification(SCR) phase partitioning removal mechanism

Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

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Chinese Physics B 2022年第10期31卷 377-383页

作者： Qi-Yuan Cheng Yu-Zhi Song Deng-Wang Li Zhi-Ping Liu Qing-Tian Meng Medical Engineering Department Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021China School of Physics and Electronics Shandong Normal UniversityJinan 250358China Shandong Laibo Biotechnology co. Ltd.Jinan 250101China School of co.trol Science and Engineering Shandong UniversityJinan 250061China

The field-free alignment of molecule Cl CN is investigated by using a terahertz few-cycle pulse(THz FCP)based on the time-dependent density matrix *** is shown that a high degree of molecular alignment can be obtained by changing the matching number of the THz FCPs in the adiabatic regime and the non-adiabatic *** matching number can affect both the maximum value of the alignment and the time at which it is *** is also found that a higher degree of alignment can be achieved by using the THz FCP at lower intensity and there exists an optimal threshold of molecular alignment with the increase of the field *** found is the frequency sensitive region in which the degree of maximum alignment can be enhanced greatly by modulating the center frequencies of different THz *** investigation demonstrates that co.paring with a THz single-cycle pulse,a better result of the field-free alignment can be created by a THz FCP at a co.stant rotational temperature of molecule.

关键词： molecular alignment few-cycle terahertz pulse density matrix theory

Bending fracture behavior of freestanding (Gd0.9Yb0.1)2Zr2O7 co.tings by using digital image co.relation and FEM simulation with 3D geometrical reco.struction

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Journal of Advanced Ceramics 2019年第4期8卷 564-575页

作者： Weiguo MAO Yujie WANG Jun SHI Huiyu HUANG Yuncheng WANG Liang LV Haoyong YANG Chen ZOU Cuiying DAI Xiaolei ZHU Daining FANG School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Department of Science and Technology Engineering AECC South Industry Co.Ltd.Xiangtan 412002China School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 210009China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

It is important to investigate the mechanical performances of (Gd0.9Yb0.1)2Zr2O7 (GYbZ) materials deposited on irregular substrates for improving new thermal barrier co.tings. Three-point bending fracture characteristics of freestanding GYbZ co.ting prepared by supersonic plasma sprayed(SPS) technique were investigated with the help of digital image co.relation technique. The cracking time, crack propagation path, and mechanical properties of GYbZ co.ting were obtained. Meanwhile, the X-ray co.puted tomography technique was introduced to scan the microstructure of freestanding GYbZ co.tings, which are used to establish three-dimensional(3D) finite element model by using the Avizo software. The brittle cracking criterion was applied to describe the bending fracture process of GYbZ co.tings. The critical cracking strain was estimated as 0.36%±0.03% by repeatedly co.paring the difference between the experimental and simulated curves. The results would be extended to predict the dangerous region and failure mechanisms of GYbZ co.tings deposited on irregular substrate during finite element simulations.

关键词： thermal barrier co.ting X-ray co.puted tomography bending fracture geometrical reco.struction cracking strain

Magnetic Fe3O4@mTiO2-AIPA Microspheres for Separation of Phosphoproteins and Non-phosphoproteins

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Journal of Wuhan University of Technology(Materials Science) 2019年第3期34卷 752-759页

作者： TANG Qiuhan LU Qi QING Guangyan School of Chemistry Chemical Engineering and LifeScienceWuhan University of TechnologyWuhan430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Research &Development Center Jushi Group Co.UdTongxiang314500China

A novel phosphoprotein separation material was developed, which is co.structed by a magnetic mesoporous Fe3 O4@TiO2（Fe3 O4@mTiO2） microsphere and a 5-aminoisophthalic acid（AIPA） monolayer that provides additional binding sites toward phosphate groups. The results of characteristic experiments demonstrated that Fe3 O4@mTiO2-AIPA had good dispersability, high magnetic susceptibility, and satisfactory grafting ratio of AIPA, ascribed to the large specific surface area of the inorganic substrate. Taking advantages of these features, Fe3 O4@mTiO2-AIPA was successfully utilized to separate α-casein（a typical phosphoprotein） and bovine serum albumin（BSA, a typical non-phosphoprotein） from their mixtures（molar ratio = 1:2）. Through adjusting pH and polarity of solutions, the BSA and α-casein were respectively enriched in washing fraction and elution fraction. This result displays the good potential of Fe3 O4@mTiO2-AIPA for application in phosphoprotein enrichment.

关键词： magnetic microsphere phosphoprotein separation α-casein

Geometric nonlinear analysis of large rotation behavior of a curved SWCNT

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International Journal of Smart and Nano Materials 2022年第2期13卷 218-231页

作者： Prasad Dharap Satish Nagarajaiah Zhiling Li co.plementary Visiting scholar Department of Civil&Env.EngRice UniversityHoustonUSA Professor Department of Civil and Env.Eng.Department of Mechanical Eng.Department of Material Science and Nano EngineeringRice UniversityHouston Former Graduate Student Department Civil and Env.EngRice UniversityHouston

Nanotubes form clusters and are found in curved bundles in nano-tube films and *** phenomenon is sus-pected to occur in these curved *** this study,the deformation of a single-wall carbon nanotube(SWCNT)interacting with curved bundle nanotubes is *** is assumed that the bundle is rigid and only van der Waals force acts between the nanotube and the bundle of nanotubes.A new method of model-ing geometric nonlinear behavior of the nanotube due to finite rotation and the co.responding van der Waals force is developed using co.rotational finite element method(CFEM)formulation,co.bined with small deformation beam theory,with the inclusion of axial *** developed CFEM method overco.es the limitation of linear Finite Element Method(FEM)formulation regarding large rotations and deformations of carbon *** study provides a numerical tool to identify the critical curvature influence on the interaction of carbon nanotubes due to van der Waals forces and can provide more insight into studying irregula-rities in the electronic transport properties of adsorbed nanotubes in nanoco.posites.

关键词： Key-words:single walled carbon nanotubes co.otational finite element formulation structural health monitoring nanoco.posites jumpphenomenon critical curvature

Estimation of heritabilities of disease resistance to Edwardsiella tarda and genetic co.relations between resistance and growth traits in Chinese tongue sole (Cynoglossus semilaevis)

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Aquaculture and Fisheries 2020年第6期5卷 289-293页

作者： Ming Li Yingming Yang Weiwei Zheng Zhongming Li Jiayu Cheng Yangzhen Li co.lege of Fisheries and Life Science Shanghai Ocean UniversityShanghai201306China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences(CAFS)Laboratory for Marine Fisheries Science and Food Production ProcessesQingdao National Laboratory for Marine Science and TechnologyQingdao266071China Weifang Sanxin Aquatic Technology Development co. Ltd.Weifang261311China Tangshan Weizhuo Aquaculture co. Ltd.Tangshan063200China

Chinese tongue sole(Cynoglossus semilaevis)is an important marine flatfish which is widely cultured in co.stal areas in *** bacterial diseases such as Edwardsiella tarda imposed serious threats to this species.A potential strategy to prevent this disease is to select resistance *** aim of the present work was to estimate the genetic variation of disease resistance to *** and to evaluate the genetic co.relations between resistance traits and growth *** types of models were fitted by using different trait definitions(binary,co.tinuous and categorical).After a 9-day challenge test,the overall survival was 75.4%(ranging from 6.4%to 100%in families),and at test day 6,the overall survival was 50.7%.We set test day 6 and 9 as cut-off point times *** heritabilities of survival traits were ranging from 0.10 to *** higher heritability values were obtained at day 6 than at day 9,regardless of which model or trait definition used(except Trait 2 in LIN).The genetic co.relations between disease resistance traits and growth traits(*** weight and total length)were low and not significant from zero(−0.12–0.24).There is a substantial re-ranking of families when defined resistance as categorical and co.tinuous traits co.pared to binary *** results co.firm the existence of genetic variation for resistance against *** and weak genetic co.relations indicate that joint genetic improvement of *** resistance and growth is scarcely available.

关键词： Heritability Genetic parameter Disease resistance Genetic co.relation Edwardsiella tarda Cynoglossus semilaevis