检索结果-南通市图书馆

Journal of Materials Science & Technology 2019年第12期35卷 2756-2760页

作者： Yuchen Deng yaming Zhang Nanlong Zhang Qiang Zhi Bo Wang Jianfeng yang State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University

High temperature physical vapor transport(HTPVT) was employed to grow polycrystalline SiC ceramics with high density and purity, induced by nano SiC particles as seeds. The obtained SiC ceramics were identified as 6 H-SiC with a mainly preferred orientation along the(0 0 0 6) plane, and an obvious refinement of grain size was demonstrated for the SiC seeds. Mean grain sizes of the obtained SiC ceramics were112 μm and 314 μm, by using the SiC seeds with the mean particle size of 50 nm and 500 nm, respectively,which were obviously smaller than that of the seed-free sample(960 μm). The samples obtained with the seeds also demonstrated enhanced flexural strength and hardness, attributing to the reduced mean grain size. Furthermore, SiC ceramics without seeds via HTPVT exhibited a high thermal conductivity of242 W·(m·K)^-1 at room temperature due to the highly preferred orientation. While the degree of preferred orientation of seed-induced samples was lower, the thermal conductivity of SiC ceramics induced by seeding still maintained at least 200 W·(m·K)^-1 at room temperature, this level was much higher than most other methods. Therefore, seed-induced method appears to be an effective way to control structures and behavior of SiC ceramics through HTPVT.

关键词： Dense silicon carbide Seed-induced Mechanical properties Thermal conductivity HTPVT

Dynamics and manipulation of ferroelectric domain walls in bismuth ferrite thin films

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第2期7卷 278-284页

作者： Shuyu Xiao yaming Jin Xiaomei Lu Sang-Wook Cheong Jiangyu Li yang Li Fengzhen Huang Jinsong Zhu National Laboratory of Solid State Microstructures and Physics School Nanjing University Collaborative Innovation Center of Advanced Microstructures Nanjing University Rutgers Center for Emergent Materials and Department of Physics and Astronomy Rutgers University Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Department of Mechanical Engineering University of Washington

Ferroelectric domain walls differ from domains not only in their crystalline and discrete symmetry, but also in their electronic, magnetic, and mechanical properties. Although domain walls provide a degree of freedom to regulate the physical properties at the nanoscale, the relatively lower controllability prevents their practical applications in nano-devices. In this work, with the advantages of 3D domain configuration detection based on piezoresponse force microscopy, we find that the mobility of three types of domain walls(tail-to-tail, head-to-tail, head-to-head) in(001) BiFeO3films varies with the applied electrical field. Under low voltages, head-to-tail domain walls are more mobile than other domain walls, while, under high voltages, tail-to-tail domain walls become rather active and possess relatively long average lengths. This is due to the high nucleation energy and relatively low growth energy for charged domain walls. Finally, we demonstrate the manipulation of domain walls through successive electric writings, resulting in well-aligned conduction paths as designed, paving the way for their application in advanced spintronic, memory and communication nano-devices.

关键词： domain wall ferroelectric thin film piezoresponse force microscopy dynamics

新时代新征程做好民族工作的核心要义、精神实质与实践指向

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

西南民族大学学报（人文社会科学版） 2023年第1期44卷 7-13页

作者：郝亚明杨文帅贵州民族大学贵州贵阳550025 南开大学周恩来政府管理学院天津300350

民族工作作为“国之大者”,全面贯彻落实党的二十大精神,是新时代新征程做好民族工作的长期战略指引和重要政治保障。党的二十大精神对新时代民族工作的指引性意义,可以从核心要义、精神实质与实践指向三个角度予以解读。从核心要义来说... 详细信息

民族工作作为“国之大者”,全面贯彻落实党的二十大精神,是新时代新征程做好民族工作的长期战略指引和重要政治保障。党的二十大精神对新时代民族工作的指引性意义,可以从核心要义、精神实质与实践指向三个角度予以解读。从核心要义来说,全面学习党的二十大精神,为新时代新征程做好民族工作确立了根本遵循;从精神实质来说,全面把握党的二十大精神,为新时代新征程做好民族工作提供了精神指引;从实践指向来说,全面落实党的二十大精神,为新时代新征程做好民族工作指明了前进方向。

关键词：党的二十大民族工作核心要义精神实质实践路径

中华民族共同体内在结构视域下的共同性与差异性关系

在线全文

学校读者我要写书评

暂无评论

云南民族大学学报（哲学社会科学版） 2023年第4期40卷 29-35页

作者：郝亚明杨文帅贵州民族大学中华民族共同体研究中心贵州贵阳550025 南开大学周恩来政府管理学院天津300350

准确认知中华民族共同体的内在结构,是铸牢中华民族共同体意识和推进中华民族共同体建设的基础前提。中华民族共同体是兼具共同性与差异性的多元一体结构,共同性与差异性生成于中华民族共同体的一体结构之内,两者同为中华民族共同体的... 详细信息

准确认知中华民族共同体的内在结构,是铸牢中华民族共同体意识和推进中华民族共同体建设的基础前提。中华民族共同体是兼具共同性与差异性的多元一体结构,共同性与差异性生成于中华民族共同体的一体结构之内,两者同为中华民族共同体的构成要素;增进共同性与尊重和包容差异性是推进中华民族共同体建设同一进程的两个方面,两者在共生融合中为中国统一多民族国家建设提供了团结统一的内生动力;中华民族共同体的结构功能则要在共同性和差异性的辩证统一中,按照增进共同性的方向推动中华民族共同体建设。不论是增进共同性还是尊重和包容差异性,都旨在推动中华民族成为认同度更高、凝聚力更强的命运共同体。

关键词：中华民族共同体内在结构共同性差异性

在线全文

学校读者我要写书评

暂无评论

论中华民族共同体建设的认同要素支撑

西北民族研究 2023年第5期 5-16页

作者：郝亚明杨文帅贵州民族大学中华民族共同体研究中心贵阳550025 南开大学周恩来政府管理学院天津300071

建构各民族共通有力的认同,是推进中华民族共同体建设的基础性路径。认同是多层次或多要素的。从关联叠加视角而言,汲取政治认同要素、心理认同要素和文化认同要素等对于认同支撑至关重要。其中,基于政治认同要素建构的政治秩序和政治归... 详细信息

建构各民族共通有力的认同,是推进中华民族共同体建设的基础性路径。认同是多层次或多要素的。从关联叠加视角而言,汲取政治认同要素、心理认同要素和文化认同要素等对于认同支撑至关重要。其中,基于政治认同要素建构的政治秩序和政治归属,能够为中华民族共同体建设提供团结统一的合法性支撑;基于心理认同要素建构的价值取向和情感纽带,能够为中华民族共同体建设提供依存亲近的情感性支撑;基于文化认同要素建构的团结根魂和同脉印记,能够为中华民族共同体建设提供多元一体的共识性支撑。

关键词：中华民族共同体政治认同心理认同文化认同

元时空视域下的中华民族共同体:“本真”与“形态”

在线全文

学校读者我要写书评

暂无评论

西南民族大学学报（人文社会科学版） 2022年第10期43卷 10-17页

作者：杨文帅郝亚明南开大学周恩来政府管理学院天津300350 贵州民族大学贵州贵阳550025

元时空视域下的中华民族共同体,是客观存在并稳定延续的元结构。它提供了这样一个认识畛域,作为“元”的中华民族共同体,包含“本真”与“形态”两个联结层级,本真供给形态,形态映射本真,二者以元结构的方式,真实呈现中华民族共同体的... 详细信息

元时空视域下的中华民族共同体,是客观存在并稳定延续的元结构。它提供了这样一个认识畛域,作为“元”的中华民族共同体,包含“本真”与“形态”两个联结层级,本真供给形态,形态映射本真,二者以元结构的方式,真实呈现中华民族共同体的过去、现在与未来状况。元时空叙事的目的不仅在于理论上思辨中华民族共同体,更要在实际中凝结中华民族共同体,铸牢中华民族共同体意识。中华民族共同体既处在实然的时空范畴,也位于应然的时空征程,在正确的时间和恰当的空间平衡之中,努力保持自身的本真、调整自身的形态,最终成为真正共同体,实现各民族自由而全面的发展。

关键词：中华民族共同体元结构时空平衡历时演变

金融严监管、企业金融化与实体经济资本配置效率

在线全文

学校读者我要写书评

暂无评论

财贸研究 2022年第1期33卷 40-52页

作者：马亚明杨兰天津财经大学研究生院天津300222 天津财经大学金融学院天津300222

基于2010—2020年中国A股上市公司数据,分析金融严监管对实体经济资本配置效率的影响,并进行基于企业金融化的中介效应渠道检验。结果显示:金融严监管显著提高了实体经济资本配置效率,且企业金融化行为在其中起部分中介作用。企业产权... 详细信息

基于2010—2020年中国A股上市公司数据,分析金融严监管对实体经济资本配置效率的影响,并进行基于企业金融化的中介效应渠道检验。结果显示:金融严监管显著提高了实体经济资本配置效率,且企业金融化行为在其中起部分中介作用。企业产权性质及市场化水平的异质性检验表明,金融严监管对实体经济资本配置效率均表现出促进作用,但企业金融化的中介作用效果表现出异质性,具体体现为非国有企业以及处于市场化较低水平环境中的企业更容易因金融化行为受到金融严监管政策的影响。进一步研究发现,上述异质性的存在是由金融活动收益水平较低的企业引起的,即金融活动收益较低的企业更容易因金融化行为受到金融严监管政策的影响。

关键词：金融严监管企业金融化实体经济资本配置效率

The alignment of AlN platelets in polymer matrix and its anisotropic thermal properties

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2019年第4期5卷 679-687页

作者： Chang-Yeoul Kim Thi My Linh Dang yaming Zhang Jian-Feng yang Bo Wang Nano-Convergence Materials Team Korea Institute of Ceramic Engineering and Technology Jinju-siGyeongsangnam-do660-031South Korea State Key Laboratory of Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an71004China

The thermal conductivity of polymer composites can be enhanced by the vertical alignment of anisotropic aluminum nitride(AlN)platelet fillers in polymer matrices.The AlN platelets in polymer matrix were aligned in the direction of in-plane and out-of-plane by using the doctor blading and the lamination process.The alignment of AlN plates in the out-of-plane or the in-plane direction has been confirmed by XRD and FE-SEM investigations.The polymer composite with the out-of-plane aligned AlN platelets showed almost 1.5 times or 2 times higher thermal conductivity than those with the AlN spheres or the in-plane aligned AlN platelets at the same filler content,respectively.This result could be attributed to the improvement of thermal pathway generated along the plane of platelets and the decrease of interfaces between the filler and the polymer.

关键词： Thermal conductivity Aluminum nitride plate Polymer composite Alignment Out-of-direction In-plane direction

Single-cell RNA sequencing reveals Nestin+active neural stem cells outside the central canal after spinal cord injury

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2022年第2期65卷 295-308页

作者： Muya Shu Xiaoyu Xue Hu Nie Xianming Wu Minghan Sun Lianyong Qiao Xing Li Bai Xu Zhifeng Xiao Yannan Zhao Yongheng Fan Bing Chen Jixiang Zhang Ya Shi Yaming Yang Falong Lu Jianwu Dai State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100080China University of the Chinese Academy of Sciences Beijing 100101China Key Laboratory of Organ Injury Aging and Regenerative Medicine of Hunan ProvinceChangsha 410008China

Neural stem cells(NSCs)in the spinal cord hold great potential for repair after spinal cord injury(SCI).The ependyma in the central canal(CC)region has been considered as the NSCs source in the spinal cord.However,the ependyma function as NSCs after SCI is still under debate.We used Nestin as a marker to isolate potential NSCs and their immediate progeny,and characterized the cells before and after SCI by single-cell RNA-sequencing(scRNA-seq).We identified two subgroups of NSCs:the subgroup located within the CC cannot prime to active NSCs after SCI,while the subgroup located outside the CC were activated and exhibited the active NSCs properties after SCI.We demonstrated the comprehensive dynamic transcriptome of NSCs from quiescent to active NSCs after SCI.This study reveals that Nestin+cells outside CC were NSCs that activated upon SCI and may thus serve as endogenous NSCs for regenerative treatment of SCI in the future.

关键词： neural stem cell Nestin scRNA-seq Smart-seq2 ependymal cell

Highly Stretchable and Transparent Ionic Conductor with Novel Hydrophobicity and Extreme-Temperature Tolerance

在线全文

学校读者我要写书评

暂无评论

Research 2020年第1期2020卷 363-372页

作者： Lei Shi Kun Jia Yiyang Gao Hua yang yaming Ma Shiyao Lu Guoxin Gao Huaitian Bu Tongqing Lu Shujiang Ding Department of Applied Chemistry School of ScienceXi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Strength and Vibration of Mechanical Structure School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China SINTEF Industry Forskningsvei 10373 OsloNorway

Highly stretchable and transparent ionic conducting materials have enabled new concepts of electronic devices denoted as iontronics,with a distinguishable working mechanism and performances from the conventional electronics.However,the existing ionic conducting materials can hardly bear the humidity and temperature change of our daily life,which has greatly hindered the development and real-world application of iontronics.Herein,we design an ion gel possessing unique traits of hydrophobicity,humidity insensitivity,wide working temperature range(exceeding 100℃,and the range covered our daily life temperature),high conductivity(10^(-3)~10^(-5) S/cm),extensive stretchability,and high transparency,which is among the bestperforming ionic conductors ever developed for flexible iontronics.Several ion gel-based iontronics have been demonstrated,including large-deformation sensors,electroluminescent devices,and ionic cables,which can serve for a long time under harsh conditions.The designed material opens new potential for the real-world application progress of iontronics.

关键词： Highly humidity exceeding