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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 710-717页

作者： Dong Wu Wen-ya Li yan-jun gao jun yang Quan Wen Nektarios Vidakis Achillefs Vairis State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Travel TechnologiesNorthwestern Polytechnical UniversityXi'an 710072China Capital Aerospace Machinery Company Beijing 100076China Department of Mechanical Engineering Hellenic Mediterranean UniversityHeraklionCrete 71004Greece

The butt welds of 4-mm thick 5A06 aluminum alloy plates were produced by adjustable-gap bobbin-tool friction stir travel with travel speeds of 200, 300, and 400 mm/min in this *** microstructure was studied using optical microscopy and electron backscatter diffraction(EBSD).Tensile tests and microhardness measurements were performed to identify the effect of the travel speed on the joint mechanical *** joints were obtained at 200 mm/min while voids were present at different positions of the joints as the travel speed *** EBSD results show that the grain size, high angle grain boundaries, and density of geometrically necessary dislocations in different regions of the joint vary depending on the recovery and recrystallization *** attention was given to the relationship between the local microstructure and mechanical *** measurements show that the average hardness of the stir zone(SZ) was greater than that of the base material, which was only affected slightly by the travel *** tensile strength of the joint decreased with increasing travel speed and the maximal strength efficiency reached 99%.

关键词： friction stir welding bobbin-tool aluminum alloy microstructure mechanical properties adjustable-gap

Fractography and morphology of shear bands of a Zr-based bulk metallic glass

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Journal of Iron and Steel Research International 2017年第4期24卷 385-389页

作者： jun Tan jun-yan gao Xue-mei Qin Zheng-rong Fu Dong Li Min Li Xiu-chang Wang Gang Wang School of Materials Science and Engineering Kunming University of Science and Technology Laboratory for Microstructures Shanghai University

Bulk metallic glasses（BMGs）have attracted considerable attention in the last few decades particularly triggered by their potential applications as novel structural and/or functional materials,owing to their superior strength,large elastic strain limit and relatively low Young′s modulus *** to their crystalline ***,a 3Dreconstruction application to the fractography and the morphology of shear bands was reported for a ductile Zr_（56）Co_（28）Al_（16）（at.%）BMG through a Phenom series desktop scanning electron *** results of the 3Dreconstruction and the following contour analysis indicate a typical shear fracture mode for the investigated *** is inferred that the fractography and the morphology of shear bands might be dependent on their composition,structure states,and loading conditions for BMGs.

关键词： Amorphous alloy Fractography Mechanical property Shear band

Resatorvid protects against hypoxic-ischemic brain damage in neonatal rats

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Neural Regeneration Research 2020年第7期15卷 1316-1325页

作者： Li-jun Jiang Zhen-Xing Xu Ming-Fu Wu Gai-Qin Dong Li-Li Zhang jun-yan gao Chen-Xi Feng Xing Feng Department of Neonatology Children's Hospital of Soochow UniversitySuzhouJiangsu ProvinceChina Department of Neonatology Affiliated Hospital of Yangzhou UniversityYangzhouJiangsu ProvinceChina

Secondary brain damage caused by hyperactivation of autophagy and inflammatory responses in neurons plays an important role in hypoxic-ischemic brain damage(HIBD).Although previous studies have implicated Toll-like receptor 4(TLR4)and nuclear factor kappa-B(NF-κB)in the neuroinflammatory response elicited by brain injury,the role and mechanisms of the TLR4-mediated autophagy signaling pathway in neonatal HIBD are still *** hypothesized that this pathway can regulate brain damage by modulating neuron autophagy and neuroinflammation in neonatal rats with ***,we established a neonatal HIBD rat model using the Rice-Vannucci method,and injected 0.75,1.5,or 3 mg/kg of the TLR4 inhibitor resatorvid(TAK-242)30 minutes after hypoxic *** results indicate that administering TAK-242 to neonatal rats after HIBD could significantly reduce the infarct volume and the extent of cerebral edema,alleviate neuronal damage and neurobehavioral impairment,and decrease the expression levels of TLR4,phospho-NF-κB p65,Beclin-1,microtubule-associated protein l light chain 3,tumor necrosis factor-α,and interleukin-1βin the ***,TAK-242 appears to exert a neuroprotective effect after HIBD by inhibiting activation of autophagy and the release of inflammatory cytokines via inhibition of the TLR4/NF-κB signaling *** study was approved by the Laboratory Animal Ethics Committee of Affiliated Hospital of yangzhou University,China(approval No.20180114-15)on January 14,2018.

关键词： autophagy hypoxic-ischemic brain damage neonatal hypoxic-ischemic brain damage neuroinflammation nuclear factor kappa-B resatorvid TAK-242 Toll-like receptor 4

A review on recent progress of thermionic cathode

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Tungsten 2020年第3期2卷 289-300页

作者： jun‑yan gao Yun‑Fei yang Xiao‑Ke Zhang Shi‑Lei Li Peng Hu Jin‑Shu Wang Key Laboratory of Advanced Functional Materials Education Ministry of ChinaFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

As the performance of vacuum electron devices is essentially governed by the properties of their cathodes,developing efficient and durable thermionic cathode is necessary and highly desired to meet the boosting requirements of vacuum electron *** review summarized the progress made in the past decades with a detailed discussion on the occurred various thermionic cathodes and their features,and the understandings of the correlation between the emission properties and the composition,where structure and synthesis method are well ***,dispenser cathodes with novel structures and emission mechanism are highlighted to indicate the recent achievement in this area of research,and Sc-cathode is considered as a promising candidate for the next-generation vacuum electron devices due to the greatly improved ***,challenges still exist to meet the ever-growing demands of thermionic cathode with collaborative requirement of high performance,easy fabrication and inadequate reproducibility.

关键词： Thermionic cathodes Performance Emission mechanism Ion bombardment Work function Tungsten

Molecular mechanisms of cardiac aging

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Journal of Geriatric Cardiology 2010年第3期7卷 184-188页

作者： Tian-jun Zhou yan gao Department of Biochemistry University of Texas Southwestern Medical Center at Dallas Dallas TX 75390-9038 USA

Age-associated changes in cardiovascular structure/ function are implicated in the markedly increased risk for cardiovascular disease in older persons. Aging not only prolongs exposure to several other cardiovascular risks, but also leads to intrinsic cardiac changes, which reduces cardiac functional reserve, predisposes the heart to stress and contributes to increased cardiovascular mortality in the elderly. Intrinsic cardiac aging in the murine model closely recapitulates age-related cardiac changes in humans, includ- ing left ventricular hypertrophy, fibrosis and diastolic dysfunction. Cardiac aging in mice is accompanied by accumulation of mitochondrial protein oxidation, increased mitochondrial DNA mutations, increased mitochondrial biogenesis, as well as decreased cardiac SERCA2 protein. All of these age-related changes are significantly attenu- ated in mice overexpressing catalase targeted to mitochondria （mCAT）. These findings demonstrate the critical role of rnitochondrial reactive oxygen species （ROS） in cardiac ag ing and support the potential antioxidants to cardiac aging lar diseases. application of mitochondrial and age-related cardiovascular diseases.

关键词： cardiac aging molecular mechanisms reactive oxygen species

A N-CoSe/CoSe_(2)-C@Cu hierarchical architecture as a current collector-integrated anode for potassium-ion batteries

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Rare Metals 2024年第8期43卷 3702-3712页

作者： Zi-Jie Mu yan-jun gao Wen-Shuai Dong Zong-You Li Qing-Yi Song Han-Jiao Huang Li-Dong Xing Jian-Guo Zhang Wei Wang Qi-Yao Yu State Key Laboratory of Explosion Science and Technology School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The highly reversible insertion/extraction of large-radius K^+into electrode materials remains a tough goal,especially for con version-type ***,we design a current collector-integrated electrode(N-CoSe/CoSe_(2)-C@Cu) as an advanced anode for potassium-ion battery(PIBs).The conductive CoSe/CoSe_(2) heterojunction with rich Se vacancy defects,conductive sp^2 N-doped carbon layer,and the elastic copper foil matrix can greatly accelerate the electron transfer and enhance the structural ***,the well-designed N-CoSe/CoSe_(2)-C@Cu current collector-integrated electrode displays enhanced potassium storage performance with regard to a high capacity(325.1 mAh·g^(-1) at 0.1 A·g^(-1) after 200cycles),an exceptional rate capability(223.5 mAh·g^(-1) at2000 mA·g^(-1)),and an extraordinary long-term cycle stability(a capacity fading of only 0.019% per cycle over1200 cycles at 2000 mA·g^(-1)).Impressively,ex situ scanning electron microscopy(SEM) characterizations prove that the elastic structure of copper foil is merged into the cleverly designed N-CoSe/CoSe_(2)-C@Cu heterostructure,which buffers the deformation of structure and volume and greatly promotes the cycle life during the potassium/depotassium process.

关键词： Potassium-ion battery Integrated collector electrode CoSe CoSe_2 Heterojunction Copper foil matrix N-doped carbon

Diagnostic imaging,preautopsy imaging and autopsy findings of 8 AIDS cases:a comparative study

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Diagnostic imaging,preautopsy imaging and autopsy findings o...

中华医学会第四次全国艾滋病、病毒性丙型肝炎暨全国热带病学术会议

作者： LI Hong-jun,gao yan-qing,CHENG Jing-liang,ZHANG Yu-zhong,WU hao 北京佑安医院性病艾滋病实验室

Background Aquired Immune Deficiency Syndrome(AIDS) presents a challenge to medical researchers because of its unique pathological and clinical *** clinical data,particularly autopsy evidence,from China have failed to provide enough pathological and etiological evidence for AIDS diagnosis,which impairs the reliability of the diagnosis and our full understanding to the occurrence and development of AIDS complications. The purpose of this study was to investigate the imaging and pathologic characteristics of *** Autopsy, imaging and pathological data from 8 cases of AIDS were retrospectively *** CT scanning of different body parts was performed during their periods of *** CT scanning was conducted from the skull to the pelvis immediately after the occurrence of *** routine formalin fixing,7 cardevers were cross sectioned for autopsy in freezing state and 1 for gross *** were obtained from each sections and organs for pathological *** The autopsy data indicated the presence of parasitic infections, bacterial infections,fungal infections,and virus infections in AIDS *** pneumonia,

关键词： Diagnostic imaging,preautopsy imaging and autopsy findings of 8 AIDS cases:a comparative study

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蛇纹石及硼镁石浮选过程中团聚与分散机理

中国有色金属学报 2017年第3期27卷 613-620页

作者：李治杭韩跃新李艳军高鹏东北大学资源与土木工程学院沈阳110819

在含有蛇纹石的矿石浮选过程中,蛇纹石易泥化并吸附于其他矿物表面,从而降低其他有用矿物的可浮性,恶化浮选环境。在硼镁石浮选过程中,蛇纹石可对硼镁石回收率产生较大影响。通过DLVO理论,对蛇纹石、硼镁石在矿浆中团聚吸附本质及其相... 详细信息

在含有蛇纹石的矿石浮选过程中,蛇纹石易泥化并吸附于其他矿物表面,从而降低其他有用矿物的可浮性,恶化浮选环境。在硼镁石浮选过程中,蛇纹石可对硼镁石回收率产生较大影响。通过DLVO理论,对蛇纹石、硼镁石在矿浆中团聚吸附本质及其相互作用机理进行深入探讨。结果表明:矿物颗粒粒度及pH值都能对颗粒间作用行为产生影响,但是后者才是主要影响因素,其本质是pH值改变矿物颗粒表面荷电状态。不同pH值条件下,颗粒间表现出不同的作用行为。pH值为9.0时,蛇纹石与硼镁石颗粒间、蛇纹石颗粒间及硼镁石颗粒间相互吸引,易产生团聚现象。当pH值为11.0时,颗粒状态随颗粒间距离而变化,颗粒间距离为2.5~12.5 nm时,呈现出分散状态;当颗粒间距离小于2.5 nm或大于12.5 nm时颗粒间相互团聚。

关键词：蛇纹石硼镁石浮选团聚分散 DLVO理论

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少模光纤的不同模式布里渊散射特性

物理学报 2017年第2期66卷 176-182页

作者：张燕君高浩雷付兴虎田永胜燕山大学信息科学与工程学院河北省特种光纤与光纤传感重点实验室秦皇岛066004

少模光纤可以传输有限的正交模式,具有模间干涉小、模式易于控制等优点.基于少模光纤的布里渊散射传感器能够有效地减小多参量测量过程中的交叉敏感,实现多物理量的测量.本文基于波动光学理论对阶跃型少模光纤各个模式布里渊散射谱的频... 详细信息

少模光纤可以传输有限的正交模式,具有模间干涉小、模式易于控制等优点.基于少模光纤的布里渊散射传感器能够有效地减小多参量测量过程中的交叉敏感,实现多物理量的测量.本文基于波动光学理论对阶跃型少模光纤各个模式布里渊散射谱的频移、线宽、峰值增益等参数进行了分析.首先对少模光纤进行了模式分析,其次分析了少模光纤不同模式的频移、线宽、增益的数学模型,以及不同模式叠加的布里渊散射谱频移、线宽、增益.结果表明:少模光纤各模式布里渊散射谱的频移在10.19—10.23 GHz范围内,且随模式阶数的减小而增加;各模式布里渊散射谱的线宽在32—34 MHz,且随模式阶数的减小而增加;各模式布里渊散射增益谱相对幅度因为模式阶数的减小而增大.少模光纤中各个模式布里渊增益谱和多模式联运布里渊增益谱均符合洛伦兹曲线分布,多模式联运导致布里渊增益谱线宽展宽,且多模式联运布里渊增益谱相对振幅一般小于单个模式的布里渊相对振幅.

关键词：少模光纤布里渊散射波动光学布里渊增益谱

Synergistic promotion strategy of “dual-site” and “dual-path” to enhance the C–C coupling between CO2 and HCHO driven by photoelectrocatalysis

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Journal of Energy Chemistry 2025年第1期100卷 39-49页

作者： Hongqiang yang Jianfeng Zheng Guoyu Wang Yifei gao Yatao yang Jia Li Xiaojin Han yan Cui Zhanggen Huang National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal Institute of Coal Chemistry Chinese Academy of Science University of Chinese Academy of Science Shenyang University of Chemical Technology

Photoelectrocatalytic coupling CO2and volatile organic compounds （VOCs） is a promising green strategy for the synergistic conversion of the two carbon-containing resources to *** catalytic efficiency is always at the mercy of chemical inertness of CO2and the competitive hydrogen evolution of ***,a modified g-C3N4/ZnAl-LDH Z-scheme heterojunction catalyst with dual reaction site was rationally designed and precisely *** Faraday efficiency of ethanol reached 68.67%with a corresponding formation rate of 227.3μmol *** revealed by in-situ characterizations and density functional theory calculations,CO2and HCHO were absorbed at Zn site and N site,***,*CO generated from CO2and HCHO was converted to*CH3O and*CHO on the dual-active-site *** detailed reaction mechanism experiments indicated that C–C coupling only occurred between*CO and*CH3O in electrocatalysis *** from the“*CO+*CH3O”path,another“*CO+*CHO”coupling path was also detected in photoelectrocatalytic *** selectivity of ethanol was significantly enhanced due to the synthesis of dual-site catalyst and the dual-path coupling path between CO2and HCHO simultaneously driven by light and electricity.

关键词： Photoelectrocatalysis Z-scheme C–C coupling Ethanol