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Phase/grain boundary assisted-3D static globularization mechanism of TC17 alloy based on the microstructure reconstruction and in-situ TEM observation

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Journal of Materials Science & Technology 2023年第26期157卷 246-261页

作者： Haoyu Pang Yingang liu Jiao Luo cong li Hong li School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

Lamellar globularization in the dual-phase titanium alloy is the key to improving plasticity and ***,the mechanism has not been fully elucidated so *** this work,the role of phase/grain bound-ary in the static globularization of TC17 alloy was systematically studied by setting differentαphase con-tent before annealing through low-and high-temperature *** compression causes the parallel distribution and fragmentation of 3Dαplates and few globularαparticles are formed at a strain rate of 1 s^(-1).Post-deformation annealing promotes the static globularization ofαphase while it is affected by initialαphase *** 730°C deformation,the development ofα/αinterface by absorbing dislocations promotes the formation of globularαgrains based on the nucleation of sepa-ratedαparticles and pre-recoveryαsubgrain during subsequent ***α/α/βandα/β/βtriple junctions formed due to highαcontent with about 36%volume fraction are favorable for the further nucleation and growth of globularαgrains by reducing interface energy,forming a 3D irregularα*** nucleation and growth of theβphase dominate the microstructure evolution during subsequent an-nealing,resulting in the local dissolution of the plate and formation ofα*** 850°C deformation,theαphase tends to nucleate at theβ/β/βtriple junctions and grow into a lamellar shape along the high energyβ/βgrain boundary due to lowαcontent with about 7%volume ***αnucleation that maintains the Burgers orientation relationship(BOR)with the surroundingβphase grows along the habit plane and thickens slowly,resulting in the formation of a precipitatedαplate with a flat surface and the suppression of static *** comprehensive investigation of lamellar globularization provides guidance for optimizing the 3D microstructure and properties of dual-phase titanium alloy.

关键词： Titanium alloy Static globularization 3D microstructure Phase/grain boundary Nucleation and growth In-situ TEM heating

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Crosslinked chitosan nanofiber mats fabricated by one-step electrospinning and ion-imprinting methods for metal ions adsorption

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Science China Chemistry 2016年第1期59卷 95-105页

作者： Yan li Jie Zhang cong Xu Yongfeng Zhou School of Materials Science and Engineering Tongji University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University

The Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats were fabricated by one-step electrospinning and ion-imprinting methods and their application as adsorbents for metal ions was also *** resulting chitosan nanofiber mats were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and thermal gravimetric analysis(TGA).The Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats were used as adsorbents for the removal of Pb(Ⅱ)ions from aqueous or acid *** effects of p H values,contact time,content of crosslinker(glutaraldehyde)on Pb(Ⅱ)ions adsorption were *** results indicated that the Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats had the highest adsorption capacity of 110.0 mg/g at p H *** kinetic study demonstrated that the adsorption of Pb(Ⅱ)ions followed the pseudo-second-order *** equilibrium isotherm data showed that the Langmuir model was the most suitable for predicting the adsorption isotherm of the studied *** Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats had good adsorption selectivity,which illustrates the equilibrium adsorption capacity in the order of Pb(Ⅱ)>Cu(Ⅱ)>Zn(Ⅱ)>Cd(Ⅱ)>Ni(Ⅱ).The Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats were stable and had good reuse ability.

关键词： chitosan one-step electrospinning ion-imprinting Pb(II) ion adsorption

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Interpretable Machine Learning Method for Compressive Strength Prediction and Analysis of Pure Fly Ash-based Geopolymer Concrete

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 65-78页

作者： SHI Yuqiong li Jingyi ZHANG Yang li li Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F Uni-versityYangling 712100China College of Water Resources and Architectural Engineering Northwest A&F UniversityYangling 712100China Chongqing Key Laboratory of Public Big Data Security Technology Chongqing 401420China Chongqing College of Mobile Communication Chongqing 401520China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina National Rail Transit Electrification and Automation Engineering Technology Research Center(Hong Kong Branch) The Hong Kong Polytechnic UniversityKowloonHung HomHong KongChina

In order to study the characteristics of pure fly ash-based geopolymer concrete(PFGC)conveniently,we used a machine learning method that can quantify the perception of characteristics to predict its compressive *** this study,505 groups of data were collected,and a new database of compressive strength of PFGC was *** order to establish an accurate prediction model of compressive strength,five different types of machine learning networks were used for comparative *** five machine learning models all showed good compressive strength prediction performance on *** them,R2,MSE,RMSE and MAE of decision tree model(DT)are 0.99,1.58,1.25,and 0.25,*** R2,MSE,RMSE and MAE of random forest model(RF)are 0.97,5.17,2.27 and 1.38,*** two models have high prediction accuracy and outstanding generalization *** order to enhance the interpretability of model decision-making,we used importance ranking to obtain the perception of machine learning model to 13 *** 13 variables include chemical composition of fly ash(SiO_(2)/Al_(2)O_(3),Si/Al),the ratio of alkaline liquid to the binder,curing temperature,curing durations inside oven,fly ash dosage,fine aggregate dosage,coarse aggregate dosage,extra water dosage and sodium hydroxide *** temperature,specimen ages and curing durations inside oven have the greatest influence on the prediction results,indicating that curing conditions have more prominent influence on the compressive strength of PFGC than ordinary Portland cement *** importance of curing conditions of PFGC even exceeds that of the concrete mix proportion,due to the low reactivity of pure fly ash.

关键词： machine learning pure fly ash geopolymer compressive strength feature perception

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Preparation and Degradation Phenol Characterization of Ti/SnO_2-Sb-Mo Electrode Doped with Different Contents of Molybdenum

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Journal of Materials Science & Technology 2015年第5期31卷 473-478页

作者： Jiyan liang cong Geng Dan li li Cui Xin Wang Department of Chemical & Environmental Engineering School of ScienceShenyang University of Technology

The Ti/SnO2-Sb-Mo electrodes doped with different molar ratios of molybdenum（Mo） were prepared by sol—gel method in order to investigate the effect of Mo on the characterization of Ti/SnO2-Sb—Mo electrodes.X-ray diffraction（XRD）,field-emission scanning electron microscopy（FE-SEM）,energy dispersive spectrometry（EDS）,and linear scanning voltammetry（LSV） were used to scrutinize the coating material and the electrochemical *** concentration of phenol,the value of total organic carbon（TOC）,the mineralization current efficiency（MCE） and the ultraviolet—visible spectroscopy（UV-Vis） spectrum of phenol solution were measured over the electrochemical degradation process of phenol to confirm the phenol degradation characterization of Ti/SnO2-Sb-Mo *** showed that the electrode at the Mo content of 1 at.%provided optimal catalytic activity for phenol degradation and the longest life *** removal percentage of phenol and TOC were 99.62%and82.67%,*** Ti/SnO2-Sb-Mo electrode with 1 at.%of Mo reached maximum MCE of phenol *** kinetic investigation of phenol and TOC degradation displayed the pseudo-first order reaction *** Ti/SnO2-Sb-Mo electrode coating with 7 at.%Mo presented the highest oxygen evolution overpotential,indicating the diverse effects for different Mo molar ratio doping.

关键词： Molybdenum Antimony doped tin oxide electrode Sol-

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Molecular and cellular bases of chronic myeloid leukemia

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Protein & Cell 2010年第2期1卷 124-132页

作者： Yaoyu Chen cong Peng Dongguang li Shaoguang li Division of Hematology/Oncology Department of MedicineUniversity of Massachusetts Medical SchoolWorcesterMA 01605USA School of Computer and Security Science Edith Cowan UniversityMount LawleyWA 6050Australia

Chronic myeloid leukemia(CML)is a myeloproliferative disease characterized by the overproduction of granulocytes,which leads to high white blood cell counts and splenomegaly in *** on clinical symptoms and laboratory findings,CML is classified into three clinical phases,often starting with a chronic phase,progressing to an accelerated phase and ultimately ending in a terminal phase called blast *** crisis phase of CML is clinically similar to an acute leukemia;in particular,B-cell acute lymphoblastic leukemia(B-ALL)is a severe form of acute leukemia in blast crisis,and there is no effective therapy for it *** is induced by the BCR-ABL oncogene,whose gene product is a BCR-ABL tyrosine ***,inhibition of BCR-ABL kinase activity by its kinase inhibitor such as imatinib mesylate(Gleevec)is a major therapeutic strategy for ***,the inability of BCR-ABL kinase inhibitors to completely kill leukemia stem cells(LSCs)indicates that these kinase inhibitors are unlikely to cure *** addition,drug resistance due to the development of BCRABL mutations occurs before and during treatment of CML with kinase inhibitors.A critical issue to resolve this problem is to fully understand the biology of LSCs,and to identify key genes that play significant roles in survival and self-renewal of *** this review,we will focus on LSCs in CML by summarizing and discussing available experimental results,including the original studies from our own laboratory.

关键词： BCR-ABL leukemic stem cells CML therapeutic agents

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Lower Bound limit Analysis of Anisotropic Soils

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Computers, Materials & Continua 2018年第1期54卷 21-41页

作者： Chunguang li Cuihua li cong Sun Hong Zheng State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Hubei Water Resources Technical College Wuhan 430202China Wuhan municipal construction group Co. Ltd.430023China

Previous approaches can only tackle anisotropic problems with cohesion varying with direction.A novel linearization of the Mohr-Coulomb yield criterion associated with plane strain problem has been achieved by simulating the Mohr’s circle with orientation lines inσ-τspace,which allows for lower bound solution of soils with cohesion and friction coefficient varying with *** finite element lower limit analysis formulation using the modified anisotropic yield criterion is then *** examples are given to illustrate the capability and effectiveness of the proposed numerical procedure for computing rigorous lower bounds for anisotropic soils.

关键词： limit analysis lower bound finite element anisotropy

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Multi-performance evaluation of high-throughput accelerated corrosion test for high-strength low-alloy 921A steel

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Journal of Iron and Steel Research International 2024年第5期31卷 1260-1278页

作者： cong-cong Du Ming-hua Qin Zhan-fang Wu Dong-ling li Lei Zhao Xiang-yang li Hai-zhou Wang Beijing Advanced Innovation Center for Materials Genome Engineering National Center for Materials Service SafetyUniversity of Science and Technology BeijingBeijing100083China China Iron and Steel Research Institute Group Co. Ltd.Beijing100081China Beijing Advanced Innovation Center for Materials Genome Engineering Central Iron and Steel Research InstituteBeijing100081China

The corrosion behavior of high-strength low-alloy 921A steel in a simulated marine atmospheric environment was studied using a high-throughput experimental *** corrosion behavior,corrosion morphology,and corrosion products of 921A steels were analyzed using various techniques,including corrosion mass loss method,polarization curve,white-light interferometry,scanning electron microscopy,energy-dispersive spectrometry,microbeam X-ray fluorescence spectrometry,X-ray diffraction technique,and X-ray photoelectron *** test results indicated that 921A steel exhibits better corrosion resistance than Q450NQR1 steel in simulated harsh atmospheric environments,as evidenced by a lower corrosion mass loss rate throughout the corrosion *** corrosion products of both steels consisted ofα-FeOOH,Fe_(3)O_(4),andγ-FeOOH,withα-FeOOH being more prevalent in the rust layer of 921A steel than in Q450NQR1 *** inner rust layer of 921A steel also exhibited an appositional enrichment region of Cr,Ni,Mo,and V,leading to its superior corrosion resistance compared to that of Q450NQR1 *** efficacy of high-throughput accelerated corrosion experimental methods was highlighted for evaluating the corrosion resistance of steel materials in harsh environmental *** findings suggest that 921A steel exhibits better corrosion resistance compared to Q450NQR1 steel and has the potential to be more suitable in harsh marine atmospheric *** characterization of the rust layer structures and composition reveals the parallel enrichment of certain elements in the inner rust layer of 921A steel,which enhances its corrosion resistance.

关键词： Atmospheric corrosion High-throughput experimental method High-strength low-alloy steel Corrosion characteristics Rust layer Element enrichment

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Longitudinal Compression Behavior of Functionally Graded Ti–6Al–4V Meshes

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Journal of Materials Science & Technology 2016年第11期32卷 1098-1104页

作者： Shangzhou Zhang cong li Wentao Hou Shuo Zhao Shujun li School of Environmental and Materials Engineering Yantai University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The compressive deformation behavior in the longitudinal direction of graded Ti–6Al–4V meshes fabricated by electron beam melting was investigated using experiments and finite element methods（FEM）.The results indicate that the overall strain along the longitudinal direction is the sum of the net strain carried by each uniform mesh constituent and the deformation behavior fits the Reuss model well. The layer thickness and the sectional area have no effect on the elastic modulus, whereas the strength increases with the sectional area due to the edge effect of each uniform mesh constituent. By optimizing3 D graded/gradient design, meshes with balanced superior properties, such as high strength, energy absorption and low elastic modulus, can be fabricated by electron beam melting.

关键词： Graded Ti–6Al–4V meshes Electron beam melting Reuss model Compressive deformation Edge effect

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Manufacture the conducting polymer with light

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Science China Chemistry 2025年第1期68卷 8-9页

作者： Yang li Tianyu li Yan Ji Baoguang liu College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology) Nanjing University of Posts & Telecommunications

Poly(3,4-ethylenedioxythiophene) (PEDOT), heralded as the “king” of conducting polymers, is esteemed in bioelectronics for its mixed electronic and ionic conductivity, mechanical properties compatible with biological tissues, tunable healing ability and stability in diverse environments [1]. Based on additive manufacturing of three-dimensional structures,PEDOT realizes the implementation in the efficient production of flexible bioelectronics, the construction of intricate electrode-neural implantations, and the development of smart brain-computer-interfaces [2].

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Dysregulation of synaptic and extrasynaptic N-methyl-D-aspartate receptors induced by amyloid-β

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Neuroscience Bulletin 2013年第6期29卷 752-760页

作者： Zhi-cong Wang Jie Zhao Shao li Department of Physiology Dalian Medical University

The toxicity of amyloid-beta（Aβ） is strongly associated with Alzheimer’s disease（AD）,which has a high incidence in the elderly *** evidence showed that alteration in the activity of N-methyl-D-aspartate receptors（NMDARs） plays a key role in Aβ-induced ***,the activation of synaptic and extrasynaptic NMDARs has distinct consequences for plasticity,gene regulation,neuronal death,and Aβ *** review focuses on the dysregulation of synaptic and extrasynaptic NMDARs induced by Aβ.On one hand,Aβ downregulates the synaptic NMDAR response by promoting NMDAR endocytosis,leading to either neurotoxicity or *** the other hand,Aβ enhances the activation of extrasynaptic NMDARs by decreasing neuronal glutamate uptake and inducing glutamate spillover,subsequently causing *** addition,selective enhancement of synaptic activity by low doses of NMDA,or reduction of extrasynaptic activity by memantine,a non-competitive NMDAR antagonist,halts Aβ-induced ***,future neuroprotective drugs for AD should aim at both the enhancement of synaptic activity and the disruption of extrasynaptic NMDAR-dependent death signaling.

关键词： amyloid-β synaptic NMDA receptor extrasynaptic NMDA receptor neurotoxicity

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