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CNT array-induced nanobubble assembly,nanodisk fabrication and enhanced spectral detection of CNT bundle density

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Nano Research 2024年第8期17卷 7737-7745页

作者： Zhiyuan Xia Ziming Ye Bo Zhao Tingsong Zhang Qi Wang Kun Chen Meng Li Xiaobing Kong Yu-Qing Zheng Enzheng Shi yuanyuan shang Anyuan Cao School of Materials Science and Engineering Peking UniversityBeijing 100871China School of Integrated Circuits Peking UniversityBeijing 100871China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China School of Engineering Westlake UniversityHangzhou 310024China

Alignment,functionalization and detection of carbon nanotube(CNT)bundles are vital processes for utilizing this onedimensional nanomaterial in ***,we report a polymer-assisted wet shearing method to acquire super-aligned craterpatterned CNT arrays by nanobubble(NB)self-assembly with a"migrate and aggregation"mechanism and use craters to controllably mold even-sized nanodisks periodically along CNT bundles with tunable *** green,low-cost method can be extended to diverse substrates and fabricate different *** an example,the Ag-nanodisk-patterned CNT arrays are utilized as substrates of surface-enhanced Raman scattering(SERS)for rhodamine 6G(R6G)and methylene blue(MB)in which a linear correlation is found between the SERS intensity and the CNT bundle density due to the periodic distribution of hot spots,enabling a spectral detection of CNT bundles and their densities by conventional dye *** from routine morphological characterization,this spectral method possesses an enhanced accuracy and a detection range of 0.1–2μm^(–1),showing its uniqueness in the detection of CNT bundle density since the intensity of traditional spectral merely relates to the quantity of CNTs,exhibiting its potential in future CNT-bundle-based electronics.

关键词： CNT arrays nanobubbles self-assembly nanodisks surface-enhanced Raman scattering(SERS)

我国人文社科领域的学术期刊评价:理论拓展、多源数据与方法创新

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中国科技期刊研究 2024年第8期35卷 1159-1168页

作者：尚媛媛郝若扬中国社会科学评价研究院北京市100732

【目的】系统探讨新形势下我国人文社科领域的学术期刊评价,关注理论指导评价方案、数据支撑评价实践和方法落实评价工作。【方法】采用文献调研、逻辑分析、归纳总结等方法,基于本土实践和国际经验,构建人文社科学术期刊评价的三维框... 详细信息

【目的】系统探讨新形势下我国人文社科领域的学术期刊评价,关注理论指导评价方案、数据支撑评价实践和方法落实评价工作。【方法】采用文献调研、逻辑分析、归纳总结等方法,基于本土实践和国际经验,构建人文社科学术期刊评价的三维框架。【结果】理论逻辑上,基于人文社科研究范式,探讨从统一标准到分类评价的调整、从学术影响力到社会影响力的拓展、从总结性评价到诊断和建议性评价的转变,为评价方案的制定提供理论依据;多源数据上,针对人文社科多源异构的数据特征,设计数据库建设宏观建设路径与微观建设单元,以保障评价实践的科学性;方法落实上,针对人文社科领域的期刊评价难点,强调同行评议与科学计量的拓展与融合。【结论】我国人文社科学术期刊评价需要在政策导向和本土实践的基础上,借鉴国际经验,从理论、数据和方法3个维度探讨契合中国特色的人文社科学术期刊评价发展进路。

关键词：人文社科学术期刊评价理论逻辑多源数据方法创新

国际期刊论文研究主题的国际化特征研究——以我国教育领域为例

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中国科技期刊研究 2024年第4期35卷 411-422页

作者：曹喆尚媛媛张琳武汉大学信息管理学院湖北省武汉市430072 武汉大学科教管理与评价中心湖北省武汉市430072 中国社会科学评价研究院北京市100732

【目的】实现国际期刊论文研究主题国际化特征的多维测度与多元划分。【方法】以我国教育领域为例,对比国内外期刊论文的研究主题分布,揭示二者之间的差异;从研究对象、主导国家、引用影响力和受众多样性4个维度,剖析国际期刊论文研究... 详细信息

【目的】实现国际期刊论文研究主题国际化特征的多维测度与多元划分。【方法】以我国教育领域为例,对比国内外期刊论文的研究主题分布,揭示二者之间的差异;从研究对象、主导国家、引用影响力和受众多样性4个维度,剖析国际期刊论文研究主题的国际化特征;构建TPUR主题分类框架,将国际期刊论文研究主题划分至不同类型以总结相关规律。【结果】我国教育领域的国际论文发表呈现出中国关注国际、国际关注中国的双向图景,中国和他国主导论文的关注重点和影响力存在差异;相较而言,致力于解决国际共性问题的理论性研究主题和聚焦中国本土问题的实践性研究主题具有更鲜明的国际化特征。【结论】科研人员需要把握好国际学界关注的议题,恰当选择国内外期刊发表论文;科研管理部门也需要建立合理的科研评价导向,为科研人员选择论文发表渠道提供科学引导。

关键词：研究主题国际化特征教育领域科学计量分析

“借船出海”还是“造船出海”?我国学术期刊国际化进程研究

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图书情报知识 2024年第5期41卷 76-88页

作者：尚媛媛曹喆张琳中国社会科学评价研究院北京100732 武汉大学信息管理学院武汉430072 武汉大学科教管理与评价中心武汉430072

[目的/意义]当前我国科研人员国际期刊论文发表的数量与影响力已处于全球领先地位,但仍面临着科研人员国际发文需求与我国国际期刊规模失衡、论文外流现象凸显、我国国际期刊影响力有限等诸多挑战。在此背景下,如何从国际论文大国成长... 详细信息

[目的/意义]当前我国科研人员国际期刊论文发表的数量与影响力已处于全球领先地位,但仍面临着科研人员国际发文需求与我国国际期刊规模失衡、论文外流现象凸显、我国国际期刊影响力有限等诸多挑战。在此背景下,如何从国际论文大国成长为国际期刊强国是我国学术期刊国际化建设中需要着重突破的难点。[研究设计/方法]对Web of Science三大索引数据库收录的中国内地地区284种国际学术期刊进行研究,比较了国内外出版商在推动我国学术期刊国际化过程中所发挥的作用。[结论/发现]国外出版商在推动我国学术期刊国际化方面起到了重要带动作用,但国内出版商也呈现蓬勃发展态势。结合学科领域来看,自然科学领域内国内出版商已形成一定“造船出海”规模,而人文社科领域“借船出海”现象更为明显。在国际化效果上,国外出版商出版的我国国际期刊整体学术影响力更高,国际合作率更高,国际传播范围更广。提出了我国学术期刊国际化要以政策引导、平台建设、机制优化为支撑,既在现阶段充分利用“借船出海”策略,又积极推动未来的“造船出海”转型,以服务科技自立自强的国家战略。[创新/价值]从国内外出版商对比的视角对我国国际学术期刊进行了系统剖析,从而为推进我国学术期刊国际化提供参考。

关键词：学术期刊出版商国际化特征国际化效果国际化策略

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胆甾相液晶图案的动态调控与应用

液晶与显示 2024年第3期39卷 349-368页

作者：尚园园王京霞江雷黄冈师范学院化学化工学院湖北黄冈438000 中国科学院理化技术研究所仿生材料与界面科学重点实验室北京100190

自然界光子晶体图案为生物的生存提供了独特的功能,例如变色龙使其皮肤图案颜色适应环境以进行伪装保护,头足类动物(鱿鱼、墨鱼、章鱼等)能够产生宽波长范围的结构颜色和光学图案以利于物种间的信息交流。受自然界光学图案的特殊功能启... 详细信息

自然界光子晶体图案为生物的生存提供了独特的功能,例如变色龙使其皮肤图案颜色适应环境以进行伪装保护,头足类动物(鱿鱼、墨鱼、章鱼等)能够产生宽波长范围的结构颜色和光学图案以利于物种间的信息交流。受自然界光学图案的特殊功能启发,胆甾相液晶的图案得以开发,并在数据存贮、传感器、柔性智能器件等方面展示了潜在应用。本文综述了胆甾相液晶图案的外场刺激响应性、功能演变及其应用。首先,总结了胆甾相液晶图案的外场刺激响应性,包括光、电、热、机械力和溶剂。其次,介绍了胆甾相液晶图案的各种应用,如具有加密和解密功能的存贮器件、信息安全防伪设备、柔性可穿戴传感器和圆偏振发光系统等。最后,介绍了胆甾相液晶图案的前景和挑战。本文为构建基于胆甾相液晶图案的新型功能材料提供了基础。

关键词：胆甾相液晶光学图案外场调控

Mechanical force-induced assembly of one-dimensional nanomaterials

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Nano Research 2020年第5期13卷 1191-1204页

作者： Shiting Wu yuanyuan shang Anyuan Cao College of Materials&Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450052China

There have been intensive and continuous research efforts in large-scale controlled assembly of one-dimensional(1D)nanomaterials,since this is the most effective and promising route toward advanced functional systems including integrated nano-circuits and flexible electronic *** date,numerous assembly approaches have been reported,showing considerable progresses in developing a variety of 1D nanomaterial assemblies and integrated systems with outstanding ***,obstacles and challenges remain ***,in this review,we summarize most widely studied assembly approaches such as Langmuir-Blodgett technique,substrate release/stretching,substrate rubbing and blown bubble films,depending on three types of external forces:compressive,tensile and shear *** highlight the important roles of these mechanical forces in aligning 1D nanomaterials such as semiconducting nanowires and carbon nanotubes,and discuss each approach on their effectiveness in achieving high-degree alignment,distinct characteristics and major ***,we point out possible research directions in this field including rational control on the orientation,density and registration,toward scale-up and cost-effective manufacturing,as well as novel assembled systems based on 1D heterojunctions and hybrid structures.

关键词： one-dimensional(1D)nanomaterials assembly compressive force tensile force shear force

Scalable Synthesis of LiF-rich 3D Architected Li Metal Anode via Direct Lithium-Fluoropolymer Pyrolysis to Enable Fast Li Cycling

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Energy & Environmental Materials 2021年第2期4卷 213-221页

作者： yuanyuan shang Tiankuo Chu Baohui Shi Kun(Kelvin)Fu Department of Mechanical Engineering University of DelawareNewark DE 19716USA Center for Composite Materials(CCM) University of DelawareNewark DE 19716USA

Lithium metal anode holds an important position in fast-charging *** lithium dendrite issues tend to exacerbate at high *** F can be considered as an effective way to improve the Li metal surface electrochemical stability to achieve high power and high ***,most of reported work are relying on in situ formation of a 2D Li F on Li metal in liquid electrolyte,which limits the scalability and plated Li ***,we address this challenge and report a scalable synthesis of Li F-rich 3D architected Li metal anode via a direct pyrolysis of molten lithium and fluoropolymer to enable fast Li charging with high current density(20 mA cm-2)and high areal capacity(20 m Ah cm-2).The 3D structure is synthesized by the pyrolysis of fluoropolymer with Li metal and results show high similarity to the pristine electrolyte-derived solid-electrolyte-interphase(SEI).This concept using pyrolysis of fluoropolymer with Li-containing active materials could be also extended to modify Li metal oxide cathode(e.g.,Li Ni0.5Mn1.5O4)for mixed conductive interphase and engineer Li solid ion conductors(e.g.,Li garnet-type oxides)for interface stabilization andframework design.

关键词： 3D architected material fast charging Li-dendrite free LiF-rich Li metal pyrolysis of fluoropolymer

HAPNet: a head-aware pedestrian detection network associated with the affinity field

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Science China(Information Sciences) 2022年第6期65卷 17-32页

作者： Jiali DING Tie LIU Yun ZHAO Zejian YUAN yuanyuan shang College of Information Engineering Capital Normal University College of Artificial Intelligence Xi'an Jiaotong University

Pedestrian detection has made great progress with the rapid development of deep learning, but pedestrian detection under occlusion remains a challenge. To solve the occlusion problem, some research endeavors have been carried out based on visible parts, such as the body, but there is still substantial room for improvement due to the introduction of additional calculation. Aiming to improve the detection performance under occlusion, this paper proposes a head-aware pedestrian detection network(HAPNet) by using the inherent structural relationship between the human body and head. The postprocessing stage is redesigned to include a scoring module and an augmented non-maximum suppression(NMS) ***, HAPNet detects head and body simultaneously through different layers of a feature map. We then propose a head-side affinity model, which can represent the association between the head and body sides. Detection and affinity prediction tasks are implemented through different branches of HAPNet. In the scoring module, the head and body detection scores are fused to match the head-body pairs to improve the detection performance. On this basis, an enhanced NMS algorithm is proposed, which achieves a good balance between reducing false positives and missing detection. The experimental results verify the effectiveness of this method in pedestrian detection under occlusion.

关键词： pedestrian detection head detection head-aware pedestrian network affinity module occlusion

Automatic salient object sequence rebuilding for video segment analysis

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Science China(Information Sciences) 2018年第1期61卷 249-260页

作者： Tie LIU Haibin DUAN yuanyuan shang Zejian YUAN Nanning ZHENG School of Automation Science and Electrical Engineering Beihang University Information Engineering College Capital Normal University The School of Electronic and Information Engineering Xi'an Jiaotong University

Detection of salient object sequences from video data is challenging when the salient object changes between consecutive frames. In this study, we addressed the salient object sequence rebuilding problem with video segment analysis. We reformulated the problem as a binary labeling problem, analyzed the potential salient object sequences in the video using a clustering method, and separated the salient object sequence from the background by applying an energy optimization method. Our proposed approach determines whether temporal consecutive pixels belong to the same salient object sequence. The conditional random field is then learned to effectively integrate the salient features and the sequence consecutive constraints.A dynamic programming algorithm was developed to resolve the energy minimization problem *** results confirmed the ability of our approach to address the salient object rebuilding problem in automatic visual attention applications and video content analysis.

关键词： salient object video attention sequence segment analysis conditional random model