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Insight from in situ microscopy into which precipitate morphology can enable high strength in magnesium alloys

Journal of Materials Science & Technology 2018年第7期34卷 1061-1066页

作者： Bo-Yu Liu Nan Yang Jian Wang Matthew Barnett Yun-Chang xin Di Wu ren-long xin Bin Li R. Lakshmi Narayan Jian-Feng Nie Ju Li Evan Ma Zhi-Wei Shan Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC) State Key Laboratory for Mechanical Behavior of Materials Xi' an Jiaotong University Xi' an 710049. People's Republic of China Mechanical and Materials Engineering University of Nebraska-Lincoln Lincoln NE 68588 USA Institute for Frontier Materials Deakin University Geelong Victoria 3216 Australia College of Materials Science and Engineering Chongqing University Chongqing 400045 People's Republic of China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 People's Republic of China Department of Chemical and Materials Engineering University of Nevada Reno USA Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh PA 15213 USA Department of Materials Science and Engineering Monash University Melbourne Victoria 3800 Australia Department of Nuclear Science and Engineering and Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA Department of Materials Science and Engineering Johns Hopkins University Baltimore MD 21218 USA

Magnesium alloys, while boasting light weight, suffer from a major drawback in their relatively low strength. Identifying the microstructural features that are most effective in strengthening is therefore a pressing challenge. Deformation twinning often mediates plastic yielding in magnesium alloys. Unfortunately, due to the complexity involved in the twinning mechanism and twin-precipitate interactions, the optimal precipitate morphology that can best impede twinning has yet to be singled out. Based on the understanding of twinning mechanism in magnesium alloys, here we propose that the lamellar precipitates or the network of plate-shaped precipitates are most effective in suppressing deformation twinning. This has been verified through quantitative in situ tests inside a transmission electron microscope on a series of magnesium alloys containing precipitates with different morphology. The insight gained is expected to have general implications for strengthening strategies and alloy design. 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Precipitate selection criterionIn-situ TEM Mg alloy Mechanical property Deformation twinning

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Static globularization and grain morphology evolution ofαandβphases during annealing of hot-rolled TC21 titanium alloy

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Transactions of Nonferrous Metals Society of China 2021年第9期31卷 2664-2676页

作者： Ke WANG Ming-yu WU Zhao ren Yu ZHANG ren-long xin Qing LIU International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

A lamellar-structure TC21 titanium alloy was hot-rolled and subsequently annealed at 820,880 and 940℃ for 1 and 6 h,and the effects of annealing parameters on static globularization and morphology evolution of bothαandβphases were *** results show thatαglobularization process is sluggish due to the limited boundary splitting at 820℃.With increasing temperature to 880℃,the accelerated boundary splitting and termination migration promote theα*** 820 and 880℃,the static recovery(SRV)and recrystallization(SRX)induce the grain refinement of interlamellarβ***,the excessively high temperature of 940℃ results in the coarsening ofαgrains due to the assistance of Ostwald ripening,and produces coarseβgrains mainly due to the absence of SRX in interlamellarβ***,880℃ is an appropriate annealing temperature to produce a homogeneous microstructure in which globularizedαand refinedβgrains distribute homogeneously.

关键词： TC21 titanium alloy αglobularization recrystallization grain refinement

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Effect of pre-rolling path on mechanical properties of rolled ZK60 alloys

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Transactions of Nonferrous Metals Society of China 2021年第5期31卷 1322-1338页

作者： Bo SONG Zhi-wen DU Qing-shan YANG Ning GUO Sheng-feng GUO Jin-cheng YU ren-long xin School of Materials and Energy Southwest UniversityChongqing 400715China School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China School of Mechanical Technology Wuxi Institute of TechnologyWuxi 214121China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Pre-cold rolling with low reductions(<3%)was used to improve the mechanical properties of rolled ZK60 *** effects of rolling path on mechanical properties were investigated in *** pre-cold rolling along the transverse... 详细信息

Pre-cold rolling with low reductions(long the transverse direction(TD)and pre-cold rolling along the normal direction(ND)can increase the yield ***,pre-cold rolling along the TD is more effective than pre-cold rolling along the ND in improving the comprehensive mechanical *** pre-cold rolling to 3%reduction,the sample rolled along the TD and the sample rolled along the ND have similar tensile yield strength(~270 MPa).However,the former has a higher compressive yield strength,lower yield asymmetry and larger toughness than the ***,pre-cold rolling can also enhance precipitation hardening ***,aging treatment cannot further improve the yield strength of pre-cold rolled ***,the related mechanism is discussed.

关键词： ZK60 alloy pre-cold rolling dislocation twin aging mechanical properties

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喀麦隆曼维莱水电站施工导流设计

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海河水利 2019年第3期 29-32页

作者：李佳隆洪松任鑫龙耿庆柱中水北方勘测设计研究有限责任公司

曼维莱水电站位于喀麦隆共和国南方省的Ntem河上。该工程主要由拦河坝、泄水建筑物、发电引水系统和电站厂房组成。施工导流设计结合坝址地形、地质、水文和水工布置,采取分期导流方案,针对其特有的地形条件和植被情况对导流建筑物布置... 详细信息

曼维莱水电站位于喀麦隆共和国南方省的Ntem河上。该工程主要由拦河坝、泄水建筑物、发电引水系统和电站厂房组成。施工导流设计结合坝址地形、地质、水文和水工布置,采取分期导流方案,针对其特有的地形条件和植被情况对导流建筑物布置和导流水力计算进行了深入的分析和研究。

关键词：施工导流围堰布置水力计算

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Early identification of stroke through deep learning with multi-modal human speech and movement data

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Neural Regeneration Research 2025年第1期20卷 234-241页

作者： Zijun Ou Haitao Wang Bin Zhang Haobang Liang Bei Hu longlong ren Yanjuan Liu Yuhu Zhang Chengbo Dai Hejun Wu Weifeng Li xin Li School of Computer Science and Engineering Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Department of Neurology Guangdong Neuroscience InstituteGuangdong Provincial People’s Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouGuangdong ProvinceChina Department of Emergency Medicine Guangdong Provincial People’s Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouGuangdong ProvinceChina

Early identification and treatment of stroke can greatly improve patient outcomes and quality of *** clinical tests such as the Cincinnati Pre-hospital Stroke Scale(CPSS)and the Face Arm Speech Test(FAST)are commonly used for stroke screening,accurate administration is dependent on specialized *** this study,we proposed a novel multimodal deep learning approach,based on the FAST,for assessing suspected stroke patients exhibiting symptoms such as limb weakness,facial paresis,and speech disorders in acute *** collected a dataset comprising videos and audio recordings of emergency room patients performing designated limb movements,facial expressions,and speech tests based on the *** compared the constructed deep learning model,which was designed to process multi-modal datasets,with six prior models that achieved good action classification performance,including the I3D,SlowFast,X3D,TPN,TimeSformer,and *** found that the findings of our deep learning model had a higher clinical value compared with the other ***,the multi-modal model outperformed its single-module variants,highlighting the benefit of utilizing multiple types of patient data,such as action videos and speech *** results indicate that a multi-modal deep learning model combined with the FAST could greatly improve the accuracy and sensitivity of early stroke identification of stroke,thus providing a practical and powerful tool for assessing stroke patients in an emergency clinical setting.

关键词： artificial intelligence deep learning diagnosis early detection FAST screening stroke

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MOF-derived Porous Carbon Nanofiber Assembly as High Efficiency ORR Electrocatalysts for Zinc-air Batteries

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Chinese Journal of Polymer Science 2023年第12期41卷 1889-1901,I0008页

作者： Jin-Liang Ma long-long Liu ren-Hai Zhao Ding Yuan xin Ning Industrial Research Institute of Nonwovens&Technical Textiles Shandong Center for Engineered NonwovensCollege of Textiles&ClothingQingdao UniversityQingdao 266071China

Reasonable construction of high activity and low cost non-noble metal oxygen reduction reaction(ORR)catalyst is of great importance for the wide application of zinc-air batteries(ZABs).Using bimetallic MOF as a precursor combined with electrospinning,high-temperature carbonization and electrodeposition,we successfully developed a porous carbon nanofiber(Co@Fe-CNFs-1000)with bimetallic active center as an efficient catalyst for *** successful construction of this special core-shell structure directly explores the synergy between different active *** results showed that the synthesized Co@Fe-CNFs-1000 catalyst exhibited ORR performance comparable to that of Pt/C in 0.1 mol/L KOH electrolyte,high half-wave potential(E_(1/2)=0.81 V)and limiting current density(J_(L)=5.4 mA·cm^(-2)).In addition,homemade liquid ZABs with Co@Fe-CNFs-1000 as the air cathode showed excellent power density(155.8 mW·cm^(-2)),specific capacity(780.6 mAh·g_(Zn)^(-1))and long-term stability(over 100 h at 2 mA·cm^(-2)),surpassing even Pt/C-based *** addition,the flexible solid-state ZABs assembled based on Co@Fe-CNFs-1000 demonstrates excellent flexibility and *** work provides a new idea for constructing ORR catalysts with high activity centers.

关键词： Electrospinning Porous structure ORR Bimetallic MOFs Zinc-air battery

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簇毛麦Dvblt101基因及其启动子的克隆与序列分析

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安徽农业大学学报 2012年第2期39卷 269-272页

作者：何华纲潘薇任新龙孙卫红朱姗颖别同德江苏大学食品与生物工程学院镇江212013 江苏大学环境学院镇江212013 扬州市农业科学研究院扬州225007

BLT101家族是一类高度保守的小分子质膜蛋白,在植物抗寒、耐旱、耐盐、脱落酸(ABA)应答等过程中起重要作用。利用PCR技术从抗寒、耐旱的簇毛麦中克隆了Dvblt101基因及其启动子。结果表明,Dvblt101cDNA全长422 bp,具有完整的开放阅读框(O... 详细信息

BLT101家族是一类高度保守的小分子质膜蛋白,在植物抗寒、耐旱、耐盐、脱落酸(ABA)应答等过程中起重要作用。利用PCR技术从抗寒、耐旱的簇毛麦中克隆了Dvblt101基因及其启动子。结果表明,Dvblt101cDNA全长422 bp,具有完整的开放阅读框(ORF),编码一条54个氨基酸残基的多肽,并具有2个保守的跨膜结构域;Dvblt101基因长为754 bp,含有2个外显子和1个内含子,启动子区域具有2个干旱/冷应答核心元件(DRE/CRT)、2个MYC结合位点和3个ABA应答元件(ABRE),该基因对低温、干旱等逆境及ABA可能存在广泛的应答。本研究为进一步揭示BLT101家族在簇毛麦抗逆过程中的作用机理奠定了基础。

关键词：簇毛麦 Dvblt101基因启动子序列分析

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Estimating energy release performance of oxidizer-activated aluminum fuel particles under ultrafast stimulus

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Defence Technology（防务技术） 2023年第5期23卷 92-99页

作者： Ya-ru Li Hui ren xin-zhou Wu Hui-xin Wang Xi-long Yu State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing100190China

Aluminum(Al) particles are good fuel additives to improve the energy output performances of explosives. Under detonation environment, reaction delay of Al particles plays a key role in the energy release efficiency. Up to date, reaction delay of Al particles is still limited by the efficiency of mass and heat transfer from oxidizers to Al particles. To address this issue, a homogeneous fuel-oxidizer assembly has recently become a promising strategy. In this work, oxidizer-activated Al fuel particles(ALG) were prepared with glycidyl azide polymer(GAP) as the oxidizer. The ALG was in uniform spherical shape and core-shell structure with shell layer of around 5 nm which was observed by scanning electron microscope and transmission electron microscope. The localized nanoscale mid-IR measurement detected the uniform distribution of characteristic absorption bond of GAP in the shell layer which confirmed the homogenous fuel-oxidizer structure of ALG. A thermal gravimetric analysis of ALG at ultrafast heating rate of 1000℃/min under argon atmosphere was conducted. The decomposition of GAP finished much earlier than that of GAP at heating rate of 10℃/min. Under ultrafast high laser fluence, the reaction response of ALG was characterized and compared with that of micro-sized Al(μAl). With the increase of laser energy, the propagation distance of the shock wave increased. However, the velocity histories were nearly the same when energies were lower than 299 mJ or higher than 706 mJ. The propagation distance of the shock wave for ALG was 0.5 mm larger than that for μAl at 2.1 μs. The underwater explosion showed the peak pressure and the shock wave energy of the ALG-based explosive were both higher than those of the μAl-based explosive at 2.5 m. This study shows the feasibility to improve the energy release of Al-based explosives via using the oxidizer-activated Al fuel particles with energetic polymer as the oxidizer.

关键词： Aluminum Glycidyl azide polymer Laser Detonation Explosive Ultrafast stimulus

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Research on a MEMS pyrotechnic with a double-layer barrier safety and arming device

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Defence Technology（防务技术） 2022年第11期18卷 2034-2044页

作者： Ke-xin Wang Teng-jiang Hu Yu-long Zhao Wei ren State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong UniversityXi'an710049China Science and Technology on Applied Physical Chemistry Laboratory Shaanxi Applied Physical Chemistry Research InstituteXi'an710061China

As an essential component of ammunition, pyrotechnics can control ignition with high ***, due to limits of fabrication technology, traditional pyrotechnics are bulky. To achieve both functionality and miniaturization, MEMS pyrotechnics integrate initiator, safety-and-arming(S&A) device and lead charge and keep all components within a small size. MEMS S&A devices, as the core component to ensure system safety, are difficult to achieve active and rapid response to control signals with high safety and reliability. In order to overcome the difficulty, we propose the design and characterization of a MEMS pyrotechnic with a double-layer barrier S&A device. The MEMS pyrotechnic is a high-integrated device with an overall size of 13.4 × 8.5 × 5.2 mm^(3). The initiator is a Ni Cr bridge foil covered with an Al/Cu O energetic film, which can generate flame when ignited by an excitation *** match the flame energy, lead styphnate is chosen in this study as the lead charge. The S&A device contains four semi-circular barriers, which are directly driven by V-shape electro-thermal actuators to gain active control of the pyrotechnics’ ignition condition with rapid response. To improve the system’s reliability, the four barriers are axisymmetrically placed in two layers, two barriers for each layer, to constitute a double-layer structure with a thickness of 100 μm. The ignition test results show that the S&A device can prevent the initiator from detonating the lead charge in safety condition. In arming condition, the lead charge will be detonated.

关键词： MEMS Pyrotechnics Safety and arming device Initiator Electro-thermal actuator

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Targeting TrkB–PSD-95 coupling to mitigate neurological disorders

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Neural Regeneration Research 2025年第3期20卷 715-724页

作者： xin Yang Yu-Wen Alvin Huang John Marshall Department of Molecular Biology Cell Biology and BiochemistryBrown UniversityProvidenceRIUSA Department of Neurology Warren Alpert Medical School of Brown UniversityProvidenceRIUSA Center for Translational Neuroscience Robert J.and Nancy D.Carney Institute for Brain Science and Brown Institute for Translational ScienceBrown UniversityProvidenceRIUSA

Tropomyosin receptor kinase B(TrkB)signaling plays a pivotal role in dendritic growth and dendritic spine formation to promote learning and *** activity-dependent release of brain-derived neurotrophic factor at synapses binds to pre-or postsynaptic TrkB resulting in the strengthening of synapses,reflected by long-term ***,the association of postsynaptic density protein-95 with TrkB enhances phospholipase Cγ-Ca^(2+)/calmodulin-dependent protein kinaseⅡand phosphatidylinositol 3-kinase-mechanistic target of rapamycin signaling required for long-term *** this review,we discuss TrkB-postsynaptic density protein-95 coupling as a promising strategy to magnify brain-derived neurotrophic factor signaling towards the development of novel therapeutics for specific neurological disorders.A reduction of TrkB signaling has been observed in neurodegenerative disorders,such as Alzheimer's disease and Huntington's disease,and enhancement of postsynaptic density protein-95 association with TrkB signaling could mitigate the observed deficiency of neuronal connectivity in schizophrenia and *** with brain-derived neurotrophic factor is problematic,due to poor pharmacokinetics,low brain penetration,and side effects resulting from activation of the p75 neurotrophin receptor or the truncated TrkB.T1 *** TrkB agonists and antibodies that activate TrkB are being intensively investigated,they cannot distinguish the multiple human TrkB splicing isoforms or cell type-specific *** TrkB–postsynaptic density protein-95 coupling provides an alternative approach to specifically boost TrkB signaling at localized synaptic sites versus global stimulation that risks many adverse side effects.

关键词： Angelman syndrome autism brain-derived neurotrophic factor depression neurodegenerative disorder neurodevelopmental disorder postsynaptic density protein-95 synaptic plasticity TrkB

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