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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 ：
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 ：
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
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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 ：
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
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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 ：
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 ：
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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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 Growth kinetics Growth kinetics Cell proliferation Cell proliferation Velocity Velocity Crystals Crystals Solidification Solidification Thermal gradients Thermal gradients Binary alloys Binary alloys Coarsening Coarsening Magnesium alloys Magnesium alloys
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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 ：
Modulation of the electronic structure of metal-based catalysts proves to be useful for optimizing the catalytic activity. However, precise modulation of the electronic structure at the atomic scale remains challenging, because of the invariant electronic structure of single atoms and the difficulty in achieving the size limit for tailored alloy particles. Herein, we report a RuCo single-atom alloy (SAA) catalyst with precisely tailored electron-rich Ru atoms confined into the Co lattice, skillfully fabricated by pyrolysis of Ru-containing ZIF-67 with a tuned Ru feed content. The structure of RuCo SAAs is well investigated by various characterization techniques, including aberration-corrected scanning transmission electron microscopy, high-energy X-ray diffraction, X-ray photoelectron spectroscopy, and X-ray absorption fine structure. It is found that the RuCo SAAs with more electron-rich Ru atoms are more active toward aqueous levulinic acid (LA) hydrogenation to.-valerolactone, delivering an extremely large turnover frequency value of 3500 h(-1), 27 fold higher than that over the state-of-art 5 wt % Ru/C catalyst and much higher than those over electron-deficient Ru single atoms and Ru-containing alloyed particles. Combined experimental investigation and computational modeling reveal that the remarkable activity originates from the intrinsic RuCo SAA active site in which the electron-rich Ru single-atom boosts C=O/H-2 adsorption and H-2 dissociation to H atoms and especially facilitates the gamma-C of LA hydrogenation, which is the rate-determining step for LA hydrogenation. This study will shed light on the precise tailoring of the electronic structure at the atomic scale and also provides insight into the development of SAA catalysts for biomass conversion.
关键词 ：
single-atom alloy single-atom alloy electron-rich Ru electron-rich Ru gamma-valerolactone gamma-valerolactone electronic structure electronic structure high activity high activity
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| GB/T 7714 | Shao, Shuai , Yang, Ying , Sun, Keju et al. Electron-Rich Ruthenium Single-Atom Alloy for Aqueous Levulinic Acid Hydrogenation [J]. | ACS CATALYSIS , 2021 , 11 (19) : 12146-12158 . |
| MLA | Shao, Shuai et al. "Electron-Rich Ruthenium Single-Atom Alloy for Aqueous Levulinic Acid Hydrogenation" . | ACS CATALYSIS 11 . 19 (2021) : 12146-12158 . |
| APA | Shao, Shuai , Yang, Ying , Sun, Keju , Yang, Songtao , Li, Ang , Yang, Feng et al. Electron-Rich Ruthenium Single-Atom Alloy for Aqueous Levulinic Acid Hydrogenation . | ACS CATALYSIS , 2021 , 11 (19) , 12146-12158 . |
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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 ：
in-situ transmission electron microscopy in-situ transmission electron microscopy oxidation oxidation Ni-based superalloys Ni-based superalloys environment-assisted cracking environment-assisted cracking
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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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