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Microscopic stresses in carbon nanotube reinforced aluminum matrix composites determined by in-situ neutron diffraction

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Journal of Materials Science & Technology 2020年第19期54卷 58-68页

作者： x.x.Zhang J.F.Zhang Z.Y.Liu W.M.Gan M.Hofmann H.Andrä B.L.xiao Z.Y.Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China German Engineering Materials Science Centre at MLZ Helmholtz-Zentrum GeesthachtD-85747 GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenD-85747 GarchingGermany Fraunhofer Institute for Industrial Mathematics Fraunhofer-Platz 1Kaiserslautern 67663Germany

One of the most desired strengthening mechanisms in the carbon nanotube reinforced aluminum matrix composites(CNT/Al)composites is the load transfer strengthening mechanism(LTSM).However,a fundamental issue concerning the LTSM is that quantitative measurements of load partitioning in these composites during loading are very *** this study,in-situ neutron diffraction study on the tensile deformation of the 3 vol.%CNT/2009 Al composite and the unreinforced 2009 Al alloy was ***{311}and{220}diffraction elastic constants(DECs)of the 2009 Al alloy were *** those DECs the average stress in the 2009 Al matrix of the composite was *** the average stress in the CNTs was separated by using the stress equilibrium *** homogenization models were also applied to explain the stress evolution in each *** results agree with experimental *** the present case,the average stress in the CNTs reaches 1630 MPa at the yield strength of the composite based on linear regression of the measured data,which leads to an increment of yield strength by about 37 *** the result of this work,an approach to quantify load partitioning in the CNTs is developed for the CNT/Al composites,which can be applied to optimize the mechanical properties of the composites.

关键词： Carbon nanotubes Aluminum matrix composites In-situ neutron diffraction Load partitioning

Can the tropical storms originated from the Bay of Bengal impact the precipitation and soil moisture over the Tibetan Plateau?

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Science China Earth Sciences 2015年第5期58卷 915-928页

作者： xiao Zhixiang DUAN AnMin State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology

This study investigates the impacts of tropical storms originated from the Bay of Bengal(BOBTSs) on the precipitation and soil moisture over the Tibetan Plateau(TP) in April–June(AMJ) and September–December(SOND) during 1981–2011 based on the best track dataset provided by Joint Typhoon Warning Centre(JTWC). Results indicate that there are about 1.35 BOBTSs influence the TP in each year and most of them occurred in May and October, and the BOBTSs in AMJ influence the TP with larger extension and higher latitudes than those in SOND. The maximum regional precipitation induced by the BOBTSs accounts for more than 50% for the total precipitation in the corresponding month and about 20% for the season. Further analysis reveals that the surface soil moisture anomalies induced by the BOBTSs can persist only 20–25 days in AMJ, and the case is also true for the snow depth in SOND. Numerical simulations by using the regional climate model of Weather Research and Forecasting(WRF) suggest that the soil moisture anomalies in the sub-surface can last 2 months whereas for the surface it can persist only about 20 days, which agrees well with the observation analysis. Overall, the effect of the preceding BOBTSs on the snow depth and soil moisture anomalies over the TP cannot maintain to summer, and there is no robust connection between the BOBTSs and summer precipitation anomalies in East China. Moreover, since the mid-1990 s, the spring rainfall induced by the BOBTSs over the TP seems to be enhanced to a certain degree because of the intensified BOBTSs.

关键词： tropical storms Bay of Bengal the Tibetan Plateau soil moisture snow depth WRF

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Rotational and translational domains of beta precipitate in aged binary Mg-Ce alloys

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Journal of Magnesium and Alloys 2021年第3期9卷 1039-1056页

作者： B.Z.Sun H.x.Zhang Y.Dong J.x.Ren Y.Tian G.M.xie J.Tan Y.H.Sun Na xiao School of Materials Science and Engineering Northeastern UniversityShenyang 110819China State Key Lab Rolling&Automat Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China Analytical and Testing Center Northeastern UniversityShenyang 110819China

The structural evolution fromβ_(1)(Mg_(3)Ce)toβ(Mg_(12)Ce)precipitates,which takes place at the over-aged stage of binary Mg-Ce alloys,are investigated by high-angle annular dark-field scanning transmission electron *** structural transformation mainly occurs in the{111}_(β1)crystallographic planes,where the newly formedβlattices exhibit two categories of domain structures,namely rotational and translational *** rotational domain is composed of threeβdomains(β_(RA),β_(RB)andβ_(RC)),which are related by a 120°rotation with respect to each other around the 111_(β1)axis of theirβ_(1)parent ***{111}_(β1)crystallographic planes can provide four sets of sublattices with the same orientation for an initial nucleation ofβ*** leads to the formation of four translationalβdomains(β_(TA),β_(TB),β_(TC)andβ_(TD)),among which any two differ by a vector of 1/6112_(β1).We deduce theoretically that there exist twenty-fourβdomains during this ***,considering the interfacial misfit,only one-third of domains can grow up and eventually formsβ***,a majority ofβribbons overlap partiallyβ_(1)plate,which is beneficial to relax interfacial strain amongβ,β_(1)andα-Mg matrix(α/β/β_(1)).The configuration of multipleβdomains can effectively regulate interfacial misfit ofα/βandβ/β_(1),which are responsible for enhancing the hardness and strength of Mg-Ce ***,this study aims to provide some clues to improve the over-aged performance of magnesium alloys by constructingβdomains and optimizing theα/β/β_(1)interface.

关键词： Magnesium alloys HAADF-STEM Rotational domain Translational domain Phase transition Interfacial misfit

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内冲击激发式安全雷管的研制与适配性测试

火工品 2025年第1期 1-6页

作者：邓小娟代鹏举董金龙刘晓娟王爱上海鲲程电子科技有限公司上海201100 广东宏大民爆集团有限公司广东广州510000 湖南湘科控股集团有限公司湖南长沙410000 江西新余国泰特种化工有限责任公司江西新余338000 湖南神斧集团湘南爆破器材有限责任公司湖南永州425000

针对工业雷管在使用过程中因起爆药感度高而引发的安全事故和环境污染问题,研制了一种新型内冲击激发式安全雷管(简称“IID雷管”),并开展其与不同点火药的适配性测试。通过采用猛炸药作为主要装药,以及设计激发组件,实现了高效有序的... 详细信息

针对工业雷管在使用过程中因起爆药感度高而引发的安全事故和环境污染问题,研制了一种新型内冲击激发式安全雷管(简称“IID雷管”),并开展其与不同点火药的适配性测试。通过采用猛炸药作为主要装药,以及设计激发组件,实现了高效有序的起爆和传爆过程;通过与不同点火药的适配测试,以及对起爆能力、延期精度等关键功能的全面评估,验证了IID雷管在与LTNR和K-K等药剂适配时,各项性能均满足行业标准。此外,IID雷管结构工艺简单、安全环保,具有广泛的应用前景。

关键词：安全雷管数码电子雷管内冲击激发无起爆药雷管激发组件

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绿色金融、碳排放约束与能源技术创新

生态经济 2025年第1期41卷 99-105,122页

作者：肖黎明贾均焱山西师范大学经济与管理学院山西太原030031

能源技术创新是实现全球长期可持续发展以及“双碳”目标的重要途径。基于2010—2019年全国30个省份的面板数据,构建固定效应模型与调节效应模型实证分析绿色金融对能源技术创新的影响与作用机制,结果表明:(1)绿色金融能够显著促进能源... 详细信息

能源技术创新是实现全球长期可持续发展以及“双碳”目标的重要途径。基于2010—2019年全国30个省份的面板数据,构建固定效应模型与调节效应模型实证分析绿色金融对能源技术创新的影响与作用机制,结果表明:(1)绿色金融能够显著促进能源领域的技术创新,并且绿色金融与碳排放约束之间的协同互补效应也对能源技术创新具有正向影响,经过一系列稳健性检验后结论依然成立。(2)机制分析表明,资本深化在绿色金融影响能源技术创新的过程中发挥负向调节作用,即资本深化削弱了绿色金融对于能源技术创新的积极作用。(3)异质性分析结果显示,绿色金融对能源技术创新的作用存在显著的区域差异,其中绿色金融在中西部地区的促进效果明显优于东部地区。该研究为完善绿色金融对能源技术创新的影响提供了理论依据与经验证据,从而为绿色金融更好服务于能源领域的转型发展提供有益启示。

关键词：绿色金融碳排放约束资本深化能源技术创新

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Gut-brain axis as a bridge in obesity and depression:Mechanistic exploration and therapeutic prospects

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World Journal of Psychiatry 2025年第1期15卷 12-20页

作者： Rui-Ying Fang xiao-Rui Pan xin-xing Zeng Zheng-Zheng Li Bo-Fan Chen Hai-Min Zeng Jie Peng The Second Clinical Medical College The Second Affiliated HospitalJiangxi Medical CollegeNanchang UniversityNanchang 330006Jiangxi ProvinceChina

A recent study by Wang et al,published in the World Journal of Psychiatry,provided preventative and therapeutic strategies for the comorbidity of obesity and *** gut-brain axis,which acts as a two-way communication system between the gastrointestinal tract and the central nervous system,plays a pivotal role in the pathogenesis of these *** suggests that metabolic byproducts,such as short-chain fatty acids,lipopolysaccharide and bile acids,which are generated by the gut microbiota,along with neurotransmitters and inflammatory mediators within the gut-brain axis,modulate the host's metabolic processes,neuronal regulation,and immune responses through diverse *** interaction between obesity and depression via the gut-brain axis involves disruptions in the gut microbiota balance,inflammatory immune responses,and alterations in the neuroendocrine *** the gut-brain axis,for example,through a ketogenic diet,the use of probiotics,and the supplementation of antioxidants,offers new remedial approaches for obesity and *** research that explores the mechanisms of the gut-brain axis is needed to provide more evidence for clinical treatment.

关键词： Gut-brain axis Obesity Depression Gut microbiota Mechanism

Ultrasonic excitation induced nanocrystallization and toughening of Zr46.75Cu46.75Al6.5 bulk metallic glass

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Journal of Materials Science & Technology 2020年第10期42卷 157-161页

作者： W.Zhai L.H.Nie x.D.Hui Y.xiao T.Wang B.Wei School of Physical Science and Technology Northwestern Polytechnical UniversityXi'an 710072China State Key Laboratory for Advanced Metals and Materials University of Science&Technology BeijingBeijing 100083China

Intensive power ultrasound is introduced to Zr46.75Cu46.75Al6.5bulk metallic glass(BMG)as an easy-procurable,non-destructive physical method to modulate its atomic rearrangement and shear deformation *** microstructure after ultrasonic excitation with amplitude about 15μm in 20 k Hz for 2 h is characterized by large amount of Cu10Zr7 nanocrystals with size of 20–50 nm embedded in the glass *** leads to a sharp increase in the critical stress for the first pop-in event of shear banding,and thus simultaneously improves both compressive plasticity and yield *** findings provide a novel approach for overcoming the strength-ductility trade-off dilemma.

关键词： Bulk metallic glass Nanocrystallization Plasticity Toughness Ultrasound

Chondroitinase ABC combined with Schwann cell transplantation enhances restoration of neural connection and functional recovery following acute and chronic spinal cord injury

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Neural Regeneration Research 2025年第5期20卷 1467-1482页

作者： Wenrui Qu xiangbing Wu Wei Wu Ying Wang Yan Sun Lingxiao Deng Melissa Walker Chen Chen Heqiao Dai Qi Han Ying Ding Yongzhi xia George Smith Rui Li Nai-Kui Liu xiao-Ming xu Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteDepartment of Neurological SurgeryIndiana University School of MedicineIndianapolisINUSA Department of Hand Surgery the Second Hospital of Jilin UniversityChangchunJilin ProvinceChina Shriners Hospitals Pediatric Research Center Temple University School of MedicinePhiladelphiaPAUSA Department of Anatomy&Cell Biology Indiana University School of MedicineIndianapolisINUSA

Schwann cell transplantation is considered one of the most promising cell-based therapy to repair injured spinal cord due to its unique growth-promoting and myelin-forming properties.A the Food and Drug Administration-approved Phase I clinical trial has been conducted to evaluate the safety of transplanted human autologous Schwann cells to treat patients with spinal cord injury.A major challenge for Schwann cell transplantation is that grafted Schwann cells are confined within the lesion cavity,and they do not migrate into the host environment due to the inhibitory barrier formed by injury-induced glial scar,thus limiting axonal reentry into the host spinal *** we introduce a combinatorial strategy by suppressing the inhibitory extracellular environment with injection of lentivirus-mediated transfection of chondroitinase ABC gene at the rostral and caudal borders of the lesion site and simultaneously leveraging the repair capacity of transplanted Schwann cells in adult rats following a mid-thoracic contusive spinal cord *** report that when the glial scar was degraded by chondroitinase ABC at the rostral and caudal lesion borders,Schwann cells migrated for considerable distances in both rostral and caudal *** Schwann cell migration led to enhanced axonal regrowth,including the serotonergic and dopaminergic axons originating from supraspinal regions,and promoted recovery of locomotor and urinary bladder ***,the Schwann cell survival and axonal regrowth persisted up to 6 months after the injury,even when treatment was delayed for 3 months to mimic chronic spinal cord *** findings collectively show promising evidence for a combinatorial strategy with chondroitinase ABC and Schwann cells in promoting remodeling and recovery of function following spinal cord injury.

关键词： axonal regrowth bladder function chondroitinase ABC functional recovery glial scar lentivirus migration Schwann cell spinal cord injury transplantation

Influence of cement-fly ash-gravel pile-supported approach embankment on abutment piles in soft ground

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 977-985页

作者： D.xiao G.L.Jiang D.Liao Y.F.Hu x.F.Liu School of Civil Engineering Southwest Jiaotong University Highway Planning Survey Design and Research Institute Sichuan Provincial Transport Department

Abutment piles in soft ground may be subjected to both vertical and horizontal soil movements resulting from approach embankment loads. To constrain the soil movements, the soft soil ground beneath the approach embankment is often improved using composite pile foundations, which aim at mitigating the bump induced by high-speed trains passing through the bridge. So far, there is limited literature on exploring the influence of the degree of ground improvement on abutment piles installed in soft soil grounds. In this paper, a series of three-dimensional （3D） centrifuge model tests was performed on an approach embankment over a silty clay deposit improved by cement-fly ash-gravel （CFG） piles combined with geogrid. Emphasis is placed on the effects of ground replacement ratio （m） on the responses of the abutment piles induced by embankment loads. Meanwhile, a numerical study was conducted with varying ground replacement ratio of the pile-reinforced grounds. Results show that the performance of the abutment piles is significantly improved when reinforcing the ground with CFG piles beneath the approach embankment. Interestingly, there is a threshold value of the replacement ratio of around 4.9% above which the effect of CFG pile foundations is limited. This implies that it is essential to optimize the ground improvement for having a cost-effective design while minimizing the risk of the bump at the end of bridge.

关键词： Abutment pile Soft soilSoil movement Ground improvement Load transfer