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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 793-807页

作者： Jinpeng Hu Tao Sun Fujun Cao Yifu Shen Zhiyuan Yang chan guo College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 210016China

Submerged friction stir processing(SFSP)with flowing water was employed to alleviate the porosities and coarse-grained structure introduced by wire-arc *** a result,uniform and ultrafine grained(UFG)structure with average grain size of 0.83μm was achieved with the help of sharply reduced heat input and holding time at elevated *** optimized UFG structure enabled a superior combination of strength and ductility with high ultimate tensile strength and elongation of 273.17 MPa and 15.39%.Specifically,grain refinement strengthening and decentralized θ(Al_(2)Cu)phase in the sample subjected to SFSP made great contributions to the enhanced *** addition,the decrease in residual stresses and removal of pores substantially enhance the *** rates of cooling and low temperature cycling,which are facilitated by the water-cooling environment throughout the machining process,are vital in obtaining superior *** work provides a new method for developing a uniform and UFG structure with excellent mechanical properties.

关键词： Submerged friction stir processing Wire-arc additive manufacturing Al-Cu alloy Residual stress Strengthening and toughening mechanism Ultrafine grained microstructure

Multifunctional MXene/rGO aerogels loaded with Co/MnO nanocomposites for enhanced electromagnetic wave absorption,thermal insulation and pressure sensing

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Nano Research 2024年第9期17卷 7803-7813页

作者： chan guo Shiping Shao Xin Zhang Yunxiang Tang Luxue Wang Jiurong Liu Lili Wu Ke Bi Fenglong Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong UniversityJinan 250061China State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China

Aerogel-based composites hold promising application prospects as potential electromagnetic wave(EMW)absorption materials,yet the construction of such materials with ingenious microstructures,appropriate magnetic/dielectric multi-components,and integrated multifunctionality remains considerably ***,a multicomponent Co/MnO/Ti_(3)C_(2)T_(x) MXene/rGO(CMMG)hybrid aerogel featured with three-dimensional(3D)vertical directional channel architecture is *** from the synergistic effect arising from the 3D conductive networking structure,diverse heterogeneous interfaces,magnetic/dielectric multicomponent,and multiple loss pathways,the optimized CMMG-2 aerogel delivers fascinating EMW absorption capabilities,characterized by a minimal reflection loss(RL_(min))of-77.41 dB and an effective absorption bandwidth(EAB)of 6.56 ***,the remarkable hydrophobicity,exceptional thermal insulation capabilities,and outstanding photothermal properties of CMMG-2 aerogel make it highly promising for multiple application in diverse and demanding ***,the distinctive pore structure of hybrid aerogel also allows it for sensitive and reliable detection of electrical signals caused by pressure changes and human ***,this research provides a viable design strategy for the development of lightweight,efficient,and multifunctional aerogel-based EMW absorption materials for various application scenarios.

关键词： electromagnetic wave absorption Ti_(3)C_(2)qT_(x)MXene reduced graphene oxide magnetic-dielectric nanoparticles multifunctional aerogel

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非欧几何历史研究的嬗变与延续

自然辩证法研究 2024年第4期40卷 102-107页

作者：郭婵婵杨保强穆蕊萍延安大学数学与计算机科学学院延安716000 西北大学科学史高等研究院西安710127

19世纪末以来,史料的发现和完善,研究者的学术传承与创新,促使非欧几何历史的研究问题逐步更新,研究方法经历了从以现代数学审视历史到古证复原,从文本实证主义到历史语境主义的转变,创作优先权等史学观点被修正。现有研究在接受史考察... 详细信息

19世纪末以来,史料的发现和完善,研究者的学术传承与创新,促使非欧几何历史的研究问题逐步更新,研究方法经历了从以现代数学审视历史到古证复原,从文本实证主义到历史语境主义的转变,创作优先权等史学观点被修正。现有研究在接受史考察、历史对现今的影响、数学细节与全局处理、国际影响力的提升上面临挑战。把握数字人文研究范式的契机,加深不同领域学者间的交流合作,非欧几何的历史研究将有更大发展。

关键词：非欧几何史史料研究范式学术传承

Study on the adoption of Schwann Cell Phenotype by Bone Marrow Stromal Cells in vitro and in vivo

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Biomedical and Environmental Sciences 2005年第5期18卷 326-333页

作者： FU-QIANG ZHAO PEI-XUN ZHANG XIANG-JUN HE chan DU ZHONG-guo FU DIAN-YING ZHANG BAO-guo JIANG People＇s Hospital Peking University Beijing 100044 China

To explore the possibilities of bone marrow stromal cells （MSCs） to adopt Schwann cell phenotype in vitro and in vivo in SD rats. Methods MSCs were obtained from tibia and femur bone marrow and cultured in culture flasks. Beta-mercaptoethanol followed by retinoic acid, forskolin, basic-FGF, PDGF and heregulin were added to induce differentiation of MSCs＇. Schwann cell markers, p75, S-100 and GFAP were used to discriminate induced properties of MSCs＇ by immunofluorescent staining. PKH-67-1abelled MSCs were transplanted into the mechanically injured rat sciatic nerve, and laser confocal microscopy was performed to localize the PKH67 labelled MSCs in the injured sciatic nerve two weeks after the operation. Fluorescence PKH67 attenuation rule was evaluated by flow cytometry in vitro. Results MSCs changed morphologically into cells resembling primary cultured Schwann cells after their induction in vitro. In vivo, a large number of MSCs were cumulated within the layer of epineurium around the injured nerve and expressed Schwann cell markers, p75, S- 100, and GFAP. Conclusion MSCs are able to support nerve fiber regeneration and re-myelination by taking on Schwann cell function, and can be potentially used as possible substitutable cells for artificial nerve conduits to promote nerve regeneration.

关键词： Bone marrow stromal cells Differentiation Schwann cells

Large-scale programmable assembly of functional microcomponents for advanced electronics via light-regulated adhesion and polymer growth

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npj Flexible Electronics 2022年第1期6卷 466-478页

作者： chan guo Zhangxu Pan changhao Li Shenghan Zou Chao Pang Jiantai Wang Jinhua Hu Zheng Gong Institute of Semiconductors Guangdong Academy of SciencesNo.363 Changxing RoadGuangzhou 510650China

Large-area,programmable assembly of diverse micro-objects onto arbitrary substrates is a fundamental yet challenging *** a simple wafer-level micro-assembly technique based on the light-triggered change in both surface topography and interfacial adhesion of a soft photo-sensitive polymer is *** particular,the light-regulated polymer growth creates locally indented and elevated zones on the stamp *** light-mediated adhesion reduction,on the other hand,facilitates the inks to be released from the *** interplay of these two effects makes it feasible for the programmable assembly of ultra-small components onto various substrates coated with supplementary adhesive *** fidelity of this technique is validated by assembling diverse materials and functional devices,with the printing size up to *** work provides a rational strategy for large-scale and programmable assembly of diverse delicate micro-objects,bypassing the common issues of some existing techniques such as poor transfer uniformity,small printing area,and high cost.

关键词： printing assembly rational

Innovations in metallurgical and materials processes:advancing liquid theory and honoring ***-jie guo's contributions to physical chemistry in metallurgy

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Journal of Iron and Steel Research International 2024年第1期31卷 1-2页

作者： Shuai Liu Jing guo Han-jie guo School of Artificial Intelligence Beijing Technology and Business UniversityBeijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

Spanning three decades,***-jie guo's research group has dedicated itself to exploring the fundamental theories and practical applications of physical chemistry within the realm of *** under the assumption that molecul... 详细信息

关键词： chemistry liquid complexes

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兰伯特的几何学思想探析

自然辩证法研究 2022年第1期38卷 83-89页

作者：郭婵婵延安大学数学与计算机科学学院延安716000

德国数学家兰伯特在《平行线理论》中通过类比球面提出锐角假设在虚半径球面上成立,这一思想成为后来数学家建立和发展非欧几何的关键。兰伯特在对公理和定义的讨论中体现的几何哲学,使得他证明平行公设时回避了困扰前人的几何直观。他... 详细信息

德国数学家兰伯特在《平行线理论》中通过类比球面提出锐角假设在虚半径球面上成立,这一思想成为后来数学家建立和发展非欧几何的关键。兰伯特在对公理和定义的讨论中体现的几何哲学,使得他证明平行公设时回避了困扰前人的几何直观。他在同时期的数学工作中将圆函数和双曲函数类比,反映出其虚半径球面类比思想的来源和应用。

关键词：兰伯特平行线理论锐角假设虚半径球面非欧几何

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绝对度量:非欧几何的开端

自然辩证法研究 2020年第3期36卷 91-96页

作者：郭婵婵西北大学科学史高等研究院西安710127 延安大学数学与计算机科学学院延安716000

非欧几何的建立源于平行公设证明问题的解决过程,是数学家描述物理空间相对应几何的结果。从度量的角度审视非欧几何的创立过程,分析先驱者和创立者的具体工作。19世纪前数学家已意识到,承认存在长度绝对度量与否,是区分非欧几何与欧氏... 详细信息

非欧几何的建立源于平行公设证明问题的解决过程,是数学家描述物理空间相对应几何的结果。从度量的角度审视非欧几何的创立过程,分析先驱者和创立者的具体工作。19世纪前数学家已意识到,承认存在长度绝对度量与否,是区分非欧几何与欧氏几何的关键。罗巴切夫斯基和波约考虑到不同尺度的空间具有不同的几何,在允许长度绝对度量的基础上建立了非欧几何。

关键词：绝对度量平行公设罗巴切夫斯基波约非欧几何

Light Regulation to Chlorophyll Synthesis and Plastid Development of the Chlorophyll-Less Golden-Leaf Privet

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Journal of Integrative Plant Biology 2010年第9期52卷 809-816页

作者： Ming Yuan Mo-Yun Xui Shu Yuan Yang-Er Chen Jun-Bo Du Fei Xu Zhong-Wei Zhang Zi-chan guo Zhong-Yi Zhao Hong-Hui Lin Key Laboratory for Bio-Resource and Eco-Environment M~nistry of Education School of Life Sciences Sichuan University Chengdu 610064 China College of Biology and Science Sichuan Agricultural University Ya'an 625014 China Plant Physiology Laboratory School of Life Sciences Sichuan University Chengdu 610064 China

Ligustrum vicaryi L. is a hybrid of Ligustrum ovalifolium Hassk. var. aureo-marginatum and Ligustrum vulgale L., and displays a chlorophyll-less phenotype. Therefore it is widely used as a horticultural shrub because of its golden-color leaves. Its putative mechanism, light responses, chlorophyll synthesis and plastid development were studied. L. vicaryi has a higher level of *** acid （ALA）, but lower levels of chlorophylls compared with L. quihoui. The yellowish phenotype of L. vicaryi upper leaves could be attributed to their hampered conversion from chlorophyllide into chlorophyll a. Despite the enhanced ALA level and the decreased thylakoid stacking in plastids, L. vicaryi golden leaves contain normal levels of Lhcb transcripts and photosystem apoproteins. Furthermore, reactive oxygen species （ROS） accumulation is almost the same in L. vicaryi and L. quihoui. The golden leaves often turn green and the contents of chlorophylls increase with decreasing light intensity. Dynamic changes of chlorophyll- synthesis-system under the light transition were also analyzed.

关键词： Chlorophylls Ligustrum Lighting Light Phenotypes Colour Plastids Leaves

Lithium-induced graphene layer containing Li_(3)P alloy phase to achieve ultra-stable electrode interface for lithium metal anode

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Rare Metals 2024年第2期43卷 562-574页

作者： Jia-Xin Chen guo-Qiang Zhang Xian-Ying Qin Kui Lin Zi-Jin Yang Ge-Meng Liang Yue Xia guo-Bin Zhang Hai-Kun Wu Qiu-chan Cai Hai Lin Bao-Hua Li Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolShenzhen518055China Shenzhen Graphene Innovation Center Co. Ltd.Shenzhen518107China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA5005Australia Department of Chemistry City University of Hong KongHong Kong990077China

Uncontrolled growth of lithium dendrite will lead to low Coulombic efficiency and poor cycle stability,which hinders the commercialization of lithium metal ***,a novel modified lithium anode with reduced graphene oxide conductive network containing trace lithiophilic phosphorus(P-rGO/Cu)is prepared by electrospraying technique combined with heat treatment *** rGO layer has a concave and undulating conductive structure,which can significantly improve the effective electrical contact between lithium metal and the current collector,speed up the kinetics of interfacial electron transport and reaction,and improve the resistance of the negative electrode to the internal stress caused by volume change of the lithium,which is advantageous for the stability of the SEI *** extremely small and uniformly distributed red phosphorus element avoids the volume change caused by lithiation to the maximum *** two-phase compound Li_(3)P obtained by alloying P with Li can directionally induce the homogeneous nucleation and dense deposition of lithium metal,address the issue of lithium dendrites and extend the cycle life of the *** obtained P-rGO/Cu exhibits excellent electrochemical performance with an average Coulombic efficiency(CE)of 98%at a current density of 1 mA·cm^(−2) for 400 cycles,and the capacity retention rate of the full cell matched with lithium iron phosphate(LFP)is 83%after 400 cycles at 1C.

关键词： Lithium anode Dendrite-free Lithiophilicity Induced nucleation deposition