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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 . |
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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 . |
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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 . |
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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 ：
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 ：
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 ：
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
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| 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 . |
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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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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 ：
Dynamic mechanism Dynamic mechanism Interface Interface Junction Junction Nickel-based superalloy Nickel-based superalloy Oxidation Oxidation
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| 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 . |
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摘要 ：
Methanol-water reforming is a promising solution for H2 production/transportation in stationary and mobile hydrogen applications. Developing inexpensive catalysts with sufficiently high activity, selectivity, and stability remains challenging. In this paper, nickel-supported over face-centered cubic (fcc) phase α-MoC has been discovered to exhibit extraordinary hydrogen production activity in the aqueous-phase methanol reforming reaction. Under optimized condition, the hydrogen production rate of 2% Ni/α-MoC is about 6 times higher than that of conventional noble metal 2% Pt/Al2O3 catalyst. We demonstrate that Ni is atomically dispersed over α-MoC via carbon bridge bonds, forming a Ni1-C x motif on the carbide surface. Such Ni1-C x motifs can effectively stabilize the isolated Ni1 sites over the α-MoC substrate, rendering maximized active site density and high structural stability. In addition, the synergy between Ni1-C x motif and α-MoC produces an active interfacial structure for water dissociation, methanol activation, and successive reforming processes with compatible activity.
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| GB/T 7714 | Lin Lili , Yu Qiaolin , Peng Mi et al. Atomically Dispersed Ni/α-MoC Catalyst for Hydrogen Production from Methanol/Water. [J]. | Journal of the American Chemical Society , 2021 , 143 (1) : 309-317 . |
| MLA | Lin Lili et al. "Atomically Dispersed Ni/α-MoC Catalyst for Hydrogen Production from Methanol/Water." . | Journal of the American Chemical Society 143 . 1 (2021) : 309-317 . |
| APA | Lin Lili , Yu Qiaolin , Peng Mi , Li Aowen , Yao Siyu , Tian Shuheng et al. Atomically Dispersed Ni/α-MoC Catalyst for Hydrogen Production from Methanol/Water. . | Journal of the American Chemical Society , 2021 , 143 (1) , 309-317 . |
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