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学者姓名：李昂
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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
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| 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
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| 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 ：
Twin crystal structured Al-10 wt.% Mg alloys that were grown over a broad solidification velocity range were prepared and studied for the first time. The high thermal gradient (G) and growth velocity (V) of directional solidification resulted in the dominant solidification of twins: the twinned dendrite trunks at constant high Vs curved in the G direction with large angles in 7 mm diameter crucibles and invaded regular columnar grains because of a distinct kinetics growth advantage. Transitive deceleration experiments were designed to produce twin crystals that evolved with lower values of V (100, 10, and 0.5 μm/s) and had a structural coarsening trend. Twin cell growth in the absence of arms occurred at a growth velocity of 10 μm/s. A coherency loss was observed at a growth velocity of 0.5 μm/s with straight coherent twin boundaries turning into curved incoherent boundaries. Linear theoretical analyses were performed to understand the structural evolution of the twins. These results demonstrate the possibility of producing dense and controlled twin crystals in the Al-Mg system under most industrial production conditions; thus, this approach can be a new structural choice for designing Al-Mg-based alloys that have widespread commercial applications. © 2020
关键词 ：
Aluminum alloys Aluminum alloys Binary alloys Binary alloys Cell proliferation Cell proliferation Coarsening Coarsening Crystals Crystals Growth kinetics Growth kinetics Magnesium alloys Magnesium alloys Solidification Solidification Thermal gradients Thermal gradients Velocity Velocity
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| GB/T 7714 | Yang, Luyan , Li, Shuangming , Fan, Kai et al. Twin crystal structured Al-10 wt.% Mg alloy over broad velocity conditions achieved by high thermal gradient directional solidification [J]. | Journal of Materials Science and Technology , 2021 , 71 : 152-162 . |
| MLA | Yang, Luyan et al. "Twin crystal structured Al-10 wt.% Mg alloy over broad velocity conditions achieved by high thermal gradient directional solidification" . | Journal of Materials Science and Technology 71 (2021) : 152-162 . |
| APA | Yang, Luyan , Li, Shuangming , Fan, Kai , Li, Yang , Chen, Yanhui , Li, Wei et al. Twin crystal structured Al-10 wt.% Mg alloy over broad velocity conditions achieved by high thermal gradient directional solidification . | Journal of Materials Science and Technology , 2021 , 71 , 152-162 . |
| 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.
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| 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 . |
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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
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| 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 . |
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摘要 ：
We report an Ag1 single-atom catalyst (Ag1 /MnO2 ), which was synthesized from thermal transformation of Ag nanoparticles (NPs) and surface reconstruction of MnO2 . The evolution process of Ag NPs to single atoms is firstly revealed by various techniques, including in situ ETEM, in situ XRD and DFT calculations. The temperature-induced surface reconstruction process from the MnO2 (211) to (310) lattice plane is critical to firmly confine the existing surface of Ag single atoms; that is, the thermal treatment and surface reconstruction of MnO2 is the driving force for the formation of single Ag atoms. The as-obtained Ag1 /MnO2 achieved 95.7 % Faradic efficiency at -0.85 V vs. RHE, and coupled with long-term stability for electrochemical CO2 reduction reaction (CO2 RR). DFT calculations indicated single Ag sites possessed high electronic density close to Fermi Level and could act exclusively as the active sites in the CO2 RR. As a result, the Ag1 /MnO2 catalyst demonstrated remarkable performance for the CO2 RR, far surpassing the conventional Ag nanosized catalyst (AgNP /MnO2 ) and other reported Ag-based catalysts.
关键词 ：
anti-Ostwald ripening anti-Ostwald ripening CO2 reduction reaction CO2 reduction reaction silver silver surface reconstruction surface reconstruction
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| GB/T 7714 | Zhang Ningqiang , Zhang Xinxin , Tao Lei et al. Silver Single-Atom Catalyst for Efficient Electrochemical CO2 Reduction Synthesized from Thermal Transformation and Surface Reconstruction. [J]. | Angewandte Chemie , 2021 , 60 (11) : 6170-6176 . |
| MLA | Zhang Ningqiang et al. "Silver Single-Atom Catalyst for Efficient Electrochemical CO2 Reduction Synthesized from Thermal Transformation and Surface Reconstruction." . | Angewandte Chemie 60 . 11 (2021) : 6170-6176 . |
| APA | Zhang Ningqiang , Zhang Xinxin , Tao Lei , Jiang Peng , Ye Chenliang , Lin Rui et al. Silver Single-Atom Catalyst for Efficient Electrochemical CO2 Reduction Synthesized from Thermal Transformation and Surface Reconstruction. . | Angewandte Chemie , 2021 , 60 (11) , 6170-6176 . |
| 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.
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| 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 . |
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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 ：
Hydrogenation reaction Hydrogenation reaction Metal atomization Metal atomization Nanowires Nanowires Particles aggregation Particles aggregation Single atom site catalysts Single atom site catalysts
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| 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 . |
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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 ：
Mechanical property Mechanical property Plastic deformation Plastic deformation Strength-ductility trade-off Strength-ductility trade-off Transmission electron microscopy Transmission electron microscopy
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| 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 . |
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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
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| 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 . |
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