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Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy

journal of Materials science & Technology 2021年第21期80卷 234-243页

作者： D.L.Gong H.L.Wang E.G.Obbard s.j.li R.Yang Y.L.Hao shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China school of Materials science and Engineering University of Science and Technology of ChinaShenyang110016China school of Mechanical Engineering Dongguan University of TechnologyDongguan523808China Department of Electrical Engineering and Telecommunications University of New South WalesSydneyNSW2052Australia

As to multifunctional titanium alloys with high strength and low elastic modulus, thermal training is crucial to tune their thermal expansion from positive to negative, resulting in a novel linear expansion which is stable in a wide temperature range. Aided by the high-order Hooke's law of elastic solids,a reversible atomic rearrangement mechanism was proposed to explain the novel findings which are unexpected from typical shape memory alloys. To confirm this continuous mechanism, a Ti-Nb based alloy, which possesses a nanoscale spongy microstructure consisting of the interpenetrated Nb-rich and Nb-lean domains produced by spinodal decomposition, was used to trace the crystal structure change by in-situ high energy synchrotron X-ray diffraction analyses. By increasing exposure time, the overlapped diffraction peaks can be separated accurately. The calculated results demonstrate that, in the nanoscale Nb-lean domains, the crystal structure parameters vary linearly with changing temperature along the atomic pathway of the bcc-hcp transition. This linear relationship in a wide temperature range is unusual for first-order martensitic shape memory alloys but is common for Invar alloys with high-order spin transitions. Furthermore, the alloy exhibits smooth DsC curves free of transformation-induced heat peaks observed in shape memory alloys, which is consistent with the proposed mechanism that the reversible transition is of high-order.

关键词： Coefficient of thermal expansion Multifunctional titanium alloys spongy microstructure Atomic rearrangement Elastic anisotropy

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Atomistic Investigation of shock-Induced Amorphization within Micro-shear Bands in Hexagonal Close-Packed Titanium

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Acta Metallurgica sinica(English Letters) 2024年第9期37卷 1590-1600页

作者： Z.C.Meng K.G.Wang T.Ali D.li C.G.Bai D.s.Xu s.j.li A.H.Feng G.j.Cao j.H.Yao Q.B.Fan H.Wang R.Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China school of Materials science and Engineering University of Science and Technology of ChinaShenyang 110016China Interdisciplinary Centre for Additive Manufacturing(ICAM) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China school of Materials science and Engineering Tongji UniversityShanghai 201804China Key Laboratory for light-Weight Materials Nanjing Tech UniversityNanjing 210009China National Key Laboratory of science and Technology on Materials Under shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

The mechanical response of a single crystal titanium sample against(0001)α surface impact was investigated using molecular dynamics ***,non-uniform plastic deformation was observed in the *** high strain rates,amorphization occurred near the edge of the contact region where severe shear strain induced a large number of stacking faults(sFs)and *** contrast,the central part of the contact region underwent less deformation with significantly fewer ***,instead of amorphization by consuming sFs and dislocations,there was a gradual increase in the density of dislocations and sFs during the process of *** local amorphous regions eventually grew into shear bands.

关键词： shock compression Amorphization shear band Titanium Molecular dynamics

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NMR Evidence for Universal Pseudogap Behavior in Quasi-Two-Dimensional Fese-Based superconductors

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Chinese Physics Letters 2022年第12期39卷 71-76页

作者： B.L.Kang M.Z.shi D.Zhao s.j.li j.li L.X.Zheng D.W.song L.P.Nie T.Wu X.H.Chen Hefei National Research Center for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Key Laboratory of strongly coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAs Center for Excellence in superconducting Electronics(CENsE) Shanghai 200050China 4Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Recently,by intercalating organic ions into bulk Fese superconductors,two kinds of layered Fese-based superconductors[(TBA)xFese and(CTA)xFese]with superconducting transition temperatures(Tc)above 40 K have been *** to the large interlayer distance(~15A),these new layered superconductors have a large resistivity anisotropy analogous to bismuth-based cuprate ***,remarkable pseudogap behavior well above Tcis revealed by nuclear magnetic resonance(NMR)measurements on77se nuclei,suggesting a preformed pairing scenario similar to that of ***,we report another new kind of organic-ion-intercalated Fese superconductor,(PY)xFese,with a reduced interlayer distance(~10A)compared to(TBA)xFese and(CTA)*** performing77se NMR and transport measurements,we observe a similar pseudogap behavior well above Tcof~40 K and a large resistivity anisotropy of~10~4 in(PY)*** these facts strongly support a universal pseudogap behavior in these layered Fese-based superconductors with quasi-two-dimensional electronic structures.

关键词： NMR superconductors layered

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Microstructures and Hardness Properties for β-Phase Ti-24Nb-4Zr-7.9sn Alloy Fabricated by Electron Beam Melting

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journal of Materials science & Technology 2013年第11期29卷 1011-1017页

作者： j.Hernandez s.j.li E.Martinez L.E.Murr X.M.Pan K.N.Amato X.Y.Cheng F.Yang C.A.Terrazas s.M.Gaytan Y.L.Hao R.Yang F.Medina R.B.Wicker Department of Metallurgical and Materials Engineering The University of Texas at El Paso shenyang National Laboratory for Materials science Institute of Metal ResearchChinese Academy of Sciences school of Materials science and Engineering Dalian University of Technology W.M.Keck Center for 3D Innovation The University of Texas at E1 Paso

Atomized, pre-alloyed Ti-24Nb-4Zr-7.9sn （wt%） powder was used to fabricate solid, prototype components by electron beam melting （EBM）. Vickers microindentation hardness values were observed to average 2 GPa for the precursor powder and 2.5 GPa for the solid, EBM-fabricated products. The powder and solid product microstructures were examined by optical and electron microscopy. X-ray diffraction analyses showed that they had bcc β-phase microstructure. However, it was found by transmission electron microscopy that the EBM-fabricated product had plate morphology with space -100-200 nm. Although the corresponding selected area diffraction patterns can be indexed by β-phase plus α＂-martensite with orthorhombic crystal structure, the dark-field analyses failed to observe the α＂-martensite. such phenomenon was also found in deformed gum metals and explained by stress-induced diffusion scattering due to phonon softening.

关键词： Biomedical titanium alloy β-Martensite Electron beam melting Hardness Optical and electron microscopy

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Efficacy and safety of Duloxetine on Osteoarthritis Knee Pain:A Meta-analysis of Randomized Controlled Trials

Efficacy and Safety of Duloxetine on Osteoarthritis Knee Pai...

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2016年广东省药师周大会

作者： Z.Y.Wang s.Y.shi s.j.li F.Chen j H Zheng H.Z.lin W Zhou j.M.lin Guangdong Province Key Laboratory for Biotechnology Drug Candidates School of Biosciences and BiopharmaceuticsGuangdong Pharmaceutical University Department of Pharmacy Zhujiang HospitalSouthern Medical University Department of Pharmacy Yue Bei people's HospitalShantou University Pharmaceutical Research & Development Zhujiang HospitalSouthern Medical University

Objectives:The aim of this meta-analysis was to evaluate the efficacy and safety of duloxetine for management of osteoarthritis knee(OAK) ***:A systematic literature search of articles for management of OAK using duloxetine were performed in Pub Med,EBsCO,EMBAsE,science Direct,MEDliNE,Clinical ***,Google scholar,and Cochrane Central Register of Controlled Trials from the available date of inception until the latest issue(October 2013).Potentially relevant randomized controlled trials(RCTs) regarding to comparison of efficacy and safety of duloxetine with placebo for managing OAK pain were ***,studies with specific data regarding to pain reductions and response rate,PGI-I,functional improvement,Western Ontario and Mc Master Osteoarthritis Index(WOMAC),adverse events,TEAEs,mortality were included and analyzed,and those with confounding conditions were *** were assessed for quality using the jadad 5-point score for ***,a meta-analysis of all RCTs eligible for inclusion criteria was performed using Review Manager 5.1 meta-analysis ***:Three RCTs that enrolled 1,011 patients were included in our *** were statistically significant differences between patients taking duloxetine and those taking placebo with regard to the reductions in pain intensity [992 patients,mean difference(MD) =-0.88,95% confidence interval(CI)-1.11 to-0.65,p

关键词： duloxetine osteoarthritis knee pain meta-analysis randomized controlled trials

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Hugan Qingzhi exerts anti-inflammatory effects in a rat model of non-alcoholic fatty liver disease

Hugan Qingzhi exerts anti-inflammatory effects in a rat mode...

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2016年广东省药师周大会

Ethnopharmacological relevance:The Hugan Qingzhi tablet(HQT) is a traditional Chinese medicine used for treating NAFLD(non-alcoholic fatty liver disease).The present study evaluated the anti-inflammatory effects of HQT in rats with *** and methods:NAFLD was induced by a high-fat diet over a 12-week period,during which HQT was administered daily to the experimental *** markers,histopathological data,and oxidative stress/antioxidant biomarkers were ***-inflammatory cytokines interleukin-1β(IL-1β),tumor necrosis factor α(TNF-α) and interleukin-6(IL-6) were detected by enzyme-linked *** of silent information regulator 1(sIRT1) and acetylated-Nuclear-factor kappa B-p65(Ac-NF-κB-p65) were performed by western ***:At high and moderate doses,HQT was highly effective in decreasing serum alanine aminotransferase(pspartate aminotransferase(psterol(ps(ps(ps was associated with reduced histological steatosis and inflammation,and significantly increased superoxide dismutase,glutathione peroxidase(GPX),and total antioxidant serum activities(psting with a significant decrease in hepatic malondialdehyde levels(pses of HQT reduced hepatic levels of the pro-inflammatory cytokines TNF-α(psIRT1 expression and depressed Ac-NF-κB-p65 expression at protein ***:In our NAFLD rat model,HQT exerted substantial anti-inflammatory and antioxidant activities,possibly involving the regulation of sIRT1 and Ac-NF-κB-p65 expression.

关键词： Non-alcoholic fatty liver disease Inflammation Hugan Qingzhi tablet silent information regulator 1 Nuclear factor-κB

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Women in visual neural regeneration research

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Neural Regeneration Research 2025年第2期20卷 489-490页

作者： Tonia s.Rex David j.Calkins Vanderbilt Eye Institute Vanderbilt University Medical CenterNashvilleTNUSA

The year 2024 marks the 60^(th)anniversary of Title IX and 25 years since the New York Times revealed bias against female faculty members at the Massachusetts Institute of *** take an opportunity here to examine the state of gender bias in a relatively new yet already prominent field,neural regeneration in the visual system,for which there is a well-defined context useful for this *** National Eye Institute(NEI)provided the first round of research funding for its Audacious Goals Initiative(AGI)on visual neural regeneration in 2013 and the last round in ***,we focus on this *** sources included PubMed,the National science Foundation(NsF),the NEI,the Blue Ridge Institute for Medical Research and data from the major professional organization for eye and vision research,the Association for Research in Vision and Ophthalmology(ARVO).

关键词： neural visual Times

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Exercise preconditioning alleviates ischemia-induced memory deficits by increasing circulating adiponectin

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Neural Regeneration Research 2025年第5期20卷 1445-1454页

作者： Meifeng Zheng Borui Zhang sonata s Y Yau Kwok-Fai so li Zhang Haining Ou Department of Rehabilitation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key Laboratory of CNs Regeneration(Ministry of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina state Key Laboratory of Brain and Cognitive science Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercise and Brain science School of PsychologyShanghai University of SportShanghaiChina Neuroscience and Neurorehabilitation Institute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral ischemia is a major health risk that requires preventive approaches in addition to drug *** exercise enhances neurogenesis and synaptogenesis,and has been widely used for functional rehabilitation after *** this study,we determined whether exercise training before disease onset can alleviate the severity of cerebral *** also examined the role of exercise-induced circulating factors in these *** mice were subjected to 14 days of treadmill exercise training before surgery for middle cerebral artery *** found that this exercise pre-conditioning strategy effectively attenuated brain infarct area,inhibited gliogenesis,protected synaptic proteins,and improved novel object and spatial memory *** analysis showed that circulating adiponectin plays a critical role in these preventive effects of *** activation of adiponectin receptors by Adipo Ron mimicked the effects of exercise,while inhibiting receptor activation abolished the exercise *** summary,our results suggest a crucial role of circulating adiponectin in the effects of exercise pre-conditioning in protecting against cerebral ischemia and supporting the health benefits of exercise.

关键词： adiponectin cerebral ischemia exercise pre-conditioning hippocampus memory function middle cerebral artery occlusion prefrontal cortex synaptic proteins treadmill exercise

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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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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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