您的检索：
学者姓名：李昂
精炼检索结果：
年份
成果类型
收录类型
来源
综合
合作者
语言
清除所有精炼条件
摘要 ：
融合卷积神经网络与VLAD的闭环检测方法
关键词 ：
词袋模型 词袋模型 特征提取 特征提取 卷积神经网络 卷积神经网络 闭环检测 闭环检测
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 李昂 , 阮晓钢 , 黄静 et al. 融合卷积神经网络与VLAD的闭环检测方法 [J]. | 李昂 , 2021 , 38 (1) : 135-142 . |
| MLA | 李昂 et al. "融合卷积神经网络与VLAD的闭环检测方法" . | 李昂 38 . 1 (2021) : 135-142 . |
| APA | 李昂 , 阮晓钢 , 黄静 , 朱晓庆 , 计算机应用与软件 . 融合卷积神经网络与VLAD的闭环检测方法 . | 李昂 , 2021 , 38 (1) , 135-142 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
传统的闭环检测方法大多采用人工设计的特征,很容易受到环境的影响。卷积神经网络通过提取层次化特征,更好地应对了光照变化,但忽略了图像的局部空间特性。针对该问题,提出一种融合VGG16与VGG-NetVLAD的闭环检测算法。该网络保留了VGG16的部分结构,并在最后一层引入了基于局部聚合描述符向量(VLAD)思想的池化层NetVLAD,使提取的特征更适用于闭环检测。实验表明,相较于传统的视觉词袋模型及其他几种深度学习方法,该算法具有更强的泛化性,可以在闭环检测中达到更高的准确率并满足实时性的要求。
关键词 ：
卷积神经网络 卷积神经网络 特征提取 特征提取 词袋模型 词袋模型 闭环检测 闭环检测
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 李昂 , 阮晓钢 , 黄静 et al. 融合卷积神经网络与VLAD的闭环检测方法 [J]. | 计算机应用与软件 , 2021 , 38 (01) : 135-142 . |
| MLA | 李昂 et al. "融合卷积神经网络与VLAD的闭环检测方法" . | 计算机应用与软件 38 . 01 (2021) : 135-142 . |
| APA | 李昂 , 阮晓钢 , 黄静 , 朱晓庆 . 融合卷积神经网络与VLAD的闭环检测方法 . | 计算机应用与软件 , 2021 , 38 (01) , 135-142 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The discovery of the spin Hall effect1 enabled the efficient generation and manipulation of the spin current. More recently, the magnetic spin Hall effect2,3 was observed in non-collinear antiferromagnets, where the spin conservation is broken due to the non-collinear spin configuration. This provides a unique opportunity to control the spin current and relevant device performance with controllable magnetization. Here, we report a magnetic spin Hall effect in a collinear antiferromagnet, Mn2Au. The spin currents are generated at two spin sublattices with broken spatial symmetry, and the antiparallel antiferromagnetic moments play an important role. Therefore, we term this effect the 'antiferromagnetic spin Hall effect'. The out-of-plane spins from the antiferromagnetic spin Hall effect are favourable for the efficient switching of perpendicular magnetized devices, which is required for high-density applications. The antiferromagnetic spin Hall effect adds another twist to the atomic-level control of spin currents via the antiferromagnetic spin structure.
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Chen Xianzhe , Shi Shuyuan , Shi Guoyi et al. Observation of the antiferromagnetic spin Hall effect. [J]. | Nature materials , 2021 , 20 (6) : 800-804 . |
| MLA | Chen Xianzhe et al. "Observation of the antiferromagnetic spin Hall effect." . | Nature materials 20 . 6 (2021) : 800-804 . |
| APA | Chen Xianzhe , Shi Shuyuan , Shi Guoyi , Fan Xiaolong , Song Cheng , Zhou Xiaofeng et al. Observation of the antiferromagnetic spin Hall effect. . | Nature materials , 2021 , 20 (6) , 800-804 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The stability of the catalyst has always received considerable attention in materials science and catalysis. Single atom site catalysts (SACs) with high surface energy and low coordination number are generally believed not as stable as nanocatalysts. Herein, we discovered that nanocrystals, such as nanowires (NWs), which are unstable at high temperature, can be directly converted into SACs without undergoing particles aggregation and growth. Insitu environmental transmission electron microscopy, X-ray absorption spectroscopy, and density functional calculation studies demonstrated that the high temperature overcomes the energy barrier of metal atomization while N-doped carbon materials regulate the atomic adsorption energy, both of which jointly cause the transformation of NWs into SACs. Notably, the obtained SACs exhibited excellent catalytic performance for the hydrogenation of nitroarenes to the corresponding amines due to the considerable decrease in energy barriers of the rate-determining step.
关键词 ：
Nanowires Nanowires Single atom site catalysts Single atom site catalysts Hydrogenation reaction Hydrogenation reaction Particles aggregation Particles aggregation Metal atomization Metal atomization
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Liu, Yan , Zhu, Guoxing , Li, Ang et al. Transforming cobalt hydroxide nanowires into single atom site catalysts [J]. | NANO ENERGY , 2021 , 83 . |
| MLA | Liu, Yan et al. "Transforming cobalt hydroxide nanowires into single atom site catalysts" . | NANO ENERGY 83 (2021) . |
| APA | Liu, Yan , Zhu, Guoxing , Li, Ang , Pei, Jiajing , Zheng, Yamin , Chen, Wenxing et al. Transforming cobalt hydroxide nanowires into single atom site catalysts . | NANO ENERGY , 2021 , 83 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The electrochemical CO2 reduction reaction (CO2RR) is of importance for reducing global CO2 emissions. Herein, we reported a highly active CO2RR catalyst, namely Co-N-Ni/NPCNSs, which is considered as an advanced single-site catalyst with Co-N-Ni bimetallic sites connected by a N bridge between Co and Ni. The N-bridged Co-N-Ni bimetallic sites were confirmed by the X-ray absorption spectroscopy. The Co-N-Ni/NPCNSs catalyst shows a higher turnover frequency of 2049 h(-1) at a low overpotential of 370 mV and CO faradaic efficiency of 96.4% compared to that of Co-N/NPCNSs (1205 h(-1) and 61.5%) and Ni-N/NPCNSs (404 h(-1) and 45.0%) with single Co-N-4 and Ni-N-4 sites, respectively. In situ synchrotron radiation Fourier transform infrared spectra and DFT calculations show that N-bridged Co-N-Ni bimetallic sites promote the formation of COOH* intermediates, thus accelerating CO2RR.
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Pei, Jiajing , Wang, Tao , Sui, Rui et al. N-Bridged Co-N-Ni: new bimetallic sites for promoting electrochemical CO2 reduction dagger [J]. | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (5) : 3019-3028 . |
| MLA | Pei, Jiajing et al. "N-Bridged Co-N-Ni: new bimetallic sites for promoting electrochemical CO2 reduction dagger" . | ENERGY & ENVIRONMENTAL SCIENCE 14 . 5 (2021) : 3019-3028 . |
| APA | Pei, Jiajing , Wang, Tao , Sui, Rui , Zhang, Xuejiang , Zhou, Danni , Qin, Fengjuan et al. N-Bridged Co-N-Ni: new bimetallic sites for promoting electrochemical CO2 reduction dagger . | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (5) , 3019-3028 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Metallic nanowires usually exhibit ultrahigh strength but suffered low ductility. Previous studies on pure metals suggested this strength-ductility trade-off results from limiting the dislocation activities. However, it is unclear whether such deformation model is valid for a solid solution alloy as well. Here, for the first time, the atomic-scale deformation process of AuCu nanowires with size of-16 nm was investigated in situ. The results show the NWs exhibit superplasticity (-185%) and high strengths (-2.98 GPa) at room temperature. It was discovered that superplasticity originates from continuous full dislocation nucleation and disappearance, as well as dislocation dipole formation and annihilation etc., which differ from the previous studies in pure metals. The observed full dislocation activities, also different from the ones in the previous studies, suggested that, as the size of the metals is below-100 nm, their deformation should be governed by partial dislocation and twinning. (c) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Plastic deformation Plastic deformation Transmission electron microscopy Transmission electron microscopy Mechanical property Mechanical property Strength-ductility trade-off Strength-ductility trade-off
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Fu, L. , Yang, C. , Wei, R. et al. In situ atomic-scale observation of AuCu alloy nanowire with superplasticity and high strength at room temperature [J]. | MATERIALS TODAY NANO , 2021 , 15 . |
| MLA | Fu, L. et al. "In situ atomic-scale observation of AuCu alloy nanowire with superplasticity and high strength at room temperature" . | MATERIALS TODAY NANO 15 (2021) . |
| APA | Fu, L. , Yang, C. , Wei, R. , Pei, X. , Teng, J. , Kong, D. et al. In situ atomic-scale observation of AuCu alloy nanowire with superplasticity and high strength at room temperature . | MATERIALS TODAY NANO , 2021 , 15 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Understanding the high-temperature initial oxidation mechanism and its dynamic processes is generally important because a small amount of initial oxidation can induce rapid corrosion and cause catastrophic failure. We reveal the mechanism of initial oxidation in a third-generation Ni-based superalloy by in situ visualizations and investigations of the nano- and atomic-scale dynamic processes from room temperature to 900 degrees C with a Cs-corrected environmental transmission electron microscope. The initial oxidation starts from the gamma/gamma' interface at low temperatures. The high-temperature oxidation process with deficient oxygen prefers oxidation sites at the cross-junctions of the gamma/gamma' interfaces. The growth rate of the oxide nanoparticles depends on the oxidation temperatures, with a low rate below 600 degrees C and a rapid-growth speed at temperatures higher than 700 degrees C. Mass transfer from the gamma' and gamma phases to the gamma/gamma' interface, particularly at the cross-junctions of these interfaces, is observed to cause oxide accumulation. This study provides a direct observation of the interphase, interface-junction-initiated outward oxidization including Al and Cr elements. These results shed light on the initial oxidation mechanisms of materials containing a second phase with interphase interfaces and the materials at deficient oxygen conditions as well as those with protection coating layers. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词 ：
Interface Interface Nickel-based superalloy Nickel-based superalloy Oxidation Oxidation Dynamic mechanism Dynamic mechanism Junction Junction
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Zhai, Yadi , Chen, Yanhui , Zhao, Yunsong et al. Initial oxidation of Ni-based superalloy and its dynamic microscopic mechanisms: The interface junction initiated outwards oxidation [J]. | ACTA MATERIALIA , 2021 , 215 . |
| MLA | Zhai, Yadi et al. "Initial oxidation of Ni-based superalloy and its dynamic microscopic mechanisms: The interface junction initiated outwards oxidation" . | ACTA MATERIALIA 215 (2021) . |
| APA | Zhai, Yadi , Chen, Yanhui , Zhao, Yunsong , Long, Haibo , Li, Xueqiao , Deng, Qingsong et al. Initial oxidation of Ni-based superalloy and its dynamic microscopic mechanisms: The interface junction initiated outwards oxidation . | ACTA MATERIALIA , 2021 , 215 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The platinum single-atom-catalyst is verified as a very successful route to approach the size limit of Pt catalysts, while how to further improve the catalytic efficiency of Pt is a fundamental scientific question and is challenging because the size issue of Pt is approached at the ultimate ceiling as single atoms. Here, a new route for further improving Pt catalytic efficiency by cobalt (Co) and Pt dual-single-atoms on titanium dioxide (TiO2 ) surfaces, which contains a fraction of nonbonding oxygen-coordinated Co-O-Pt dimers, is reported. These Co-Pt dimer sites originate from loading high-density Pt single-atoms and Co single-atoms, with them anchoring randomly on the TiO2 substrate. This dual-single-atom catalyst yields 13.4% dimer sites and exhibits an ultrahigh and stable photocatalytic activity with a rate of 43.467 mmol g-1 h-1 and external quantum efficiency of ≈83.4% at 365 nm. This activity far exceeds those of equal amounts of Pt single-atom and typical Pt clustered catalysts by 1.92 and 1.64 times, respectively. The enhancement mechanism relies on the oxygen-coordinated Co-O-Pt dimer coupling, which can mutually optimize the electronic states of both Pt and Co sites to weaken H* binding. Namely, the "mute" Co single-atom is activated by Pt single-atom and the activity of the Pt atom is further enhanced through the dimer interaction. This strategy of nonbonding interactive dimer sites and the oxygen-mediated catalytic mechanisms provide emerging rich opportunities for greatly improving the catalytic efficiency and developing novel catalysts with creating new electronic states.
关键词 ：
dual single-atoms dual single-atoms hydrogen evolution reaction hydrogen evolution reaction oxygen-coordination oxygen-coordination single-atomic-site catalysts single-atomic-site catalysts TiO2 photocatalysts TiO2 photocatalysts
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Wang Cong , Wang Kaiwen , Feng Yibo et al. Co and Pt Dual-Single-Atoms with Oxygen-Coordinated Co-O-Pt Dimer Sites for Ultrahigh Photocatalytic Hydrogen Evolution Efficiency. [J]. | Advanced materials , 2021 , 33 (13) : e2003327 . |
| MLA | Wang Cong et al. "Co and Pt Dual-Single-Atoms with Oxygen-Coordinated Co-O-Pt Dimer Sites for Ultrahigh Photocatalytic Hydrogen Evolution Efficiency." . | Advanced materials 33 . 13 (2021) : e2003327 . |
| APA | Wang Cong , Wang Kaiwen , Feng Yibo , Li Chong , Zhou Xiaoyuan , Gan Liyong et al. Co and Pt Dual-Single-Atoms with Oxygen-Coordinated Co-O-Pt Dimer Sites for Ultrahigh Photocatalytic Hydrogen Evolution Efficiency. . | Advanced materials , 2021 , 33 (13) , e2003327 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Rhenium is the key element for improving the mechanical properties in gamma/gamma' structure single-crystal Nibased superalloys, but its oxidation-induced evaporation results in a detrimental decrease in corrosion resistance. The in situ Re evaporation process of a single lamella of a high Re-containing Ni-based superalloy is recorded in an environmental transmission electron microscope. The local aggregation of Re in the inner border of the gamma phase and subsequent evaporation forms channels for the accelerated oxidation of the base and other elements. The real oxidation process of Re evaporation provides detailed and essential information on corrosive gas resistance properties at the nanoscale. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词 ：
Interface segregation Interface segregation Oxidation Oxidation Rhenium Rhenium Superalloy Superalloy Transmission electron microscopy Transmission electron microscopy
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Chen, Yanhui , Zhang, Wenhan , Zhao, Yunsong et al. Oxidation-induced rhenium evaporation in Ni-based single crystal superalloy thin lamella [J]. | SCRIPTA MATERIALIA , 2021 , 203 . |
| MLA | Chen, Yanhui et al. "Oxidation-induced rhenium evaporation in Ni-based single crystal superalloy thin lamella" . | SCRIPTA MATERIALIA 203 (2021) . |
| APA | Chen, Yanhui , Zhang, Wenhan , Zhao, Yunsong , Zhai, Yadi , Zhang, Bin , Lu, Hui et al. Oxidation-induced rhenium evaporation in Ni-based single crystal superalloy thin lamella . | SCRIPTA MATERIALIA , 2021 , 203 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Oxygen-affected cracking commonly presents on thin Ni-based single crystal superalloy components serving in high temperature and oxidizing environments. This study uses a newly developed in-situ thermal-stress environmental transmission electron microscope to investigate the oxidation and fracture behaviors of Ni-based single crystal superalloy at 650 degrees C under stress. The in-situ oxidation was found to change the tensile fracture mode from the close-packed {111} planes of plastic fracture to {001} planes adjacent to gamma/gamma ' interfaces of brittle fracture. The microanalysis also revealed that the gamma ' cuboids, gamma phase, and gamma/gamma interface exhibit different oxidation behavior, thus underscoring the thickness debit effect. [GRAPHICS] .
关键词 ：
environment-assisted cracking environment-assisted cracking in-situ transmission electron microscopy in-situ transmission electron microscopy Ni-based superalloys Ni-based superalloys oxidation oxidation
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | Li, Xueqiao , Liu, Yinong , Zhao, Yunsong et al. Oxygen changes crack modes of Ni-based single crystal superalloy [J]. | MATERIALS RESEARCH LETTERS , 2021 , 9 (12) : 531-539 . |
| MLA | Li, Xueqiao et al. "Oxygen changes crack modes of Ni-based single crystal superalloy" . | MATERIALS RESEARCH LETTERS 9 . 12 (2021) : 531-539 . |
| APA | Li, Xueqiao , Liu, Yinong , Zhao, Yunsong , Chen, Yanhui , Li, Ang , Zhang, Jianfei et al. Oxygen changes crack modes of Ni-based single crystal superalloy . | MATERIALS RESEARCH LETTERS , 2021 , 9 (12) , 531-539 . |
| 导入链接 | NoteExpress RIS BibTex |
导出
| 数据： |
选中 到 |
| 格式： |
