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< Page ,Total 16616 >
Spatial confinement: An effective strategy to improve H2O and SO2 resistance of the expandable graphite-modified TiO2-supported Pt nanocatalysts for CO oxidation SCIE Scopus
期刊论文 | 2025 , 148 , 57-68 | Journal of Environmental Sciences (China)
SCOPUS Cited Count: 2
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Abstract :

The expandable graphite (EG) modified TiO2 nanocomposites were prepared by the high shear method using the TiO2 nanoparticles (NPs) and EG as precursors, in which the amount of EG doped in TiO2 was 10 wt.%. Followed by the impregnation method, adjusting the pH of the solution to 10, and using the electrostatic adsorption to achieve spatial confinement, the Pt elements were mainly distributed on the exposed TiO2, thus generating the Pt/10EG-TiO2–10 catalyst. The best CO oxidation activity with the excellent resistance to H2O and SO2 was obtained over the Pt/10EG-TiO2–10 catalyst: CO conversion after 36 hr of the reaction was ca. 85% under the harsh condition of 10 vol.% H2O and 100 ppm SO2 at a high gaseous hourly space velocity (GHSV) of 400,000 hr−1. Physicochemical properties of the catalysts were characterized by various techniques. The results showed that the electrostatic adsorption, which riveted the Pt elements mainly on the exposed TiO2 of the support surface, reduced the dispersion of Pt NPs on EG and achieved the effective dispersion of Pt NPs, hence significantly improving CO oxidation activity over the Pt/10EG-TiO2–10 catalyst. The 10 wt.% EG doped in TiO2 caused the TiO2 support to form a more hydrophobic surface, which reduced the adsorption of H2O and SO2 on the catalyst, greatly inhibited deposition of the TiOSO4 and formation of the PtSO4 species as well as suppressed the oxidation of SO2, thus resulting in an improvement in the resistance to H2O and SO2 of the Pt/10EG-TiO2–10 catalyst. © 2023

Keyword :

Titania supported platinum Electrostatic adsorption CO oxidation Resistance to H2O and SO2 Expandable graphite

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GB/T 7714 Zhu, H. , Qiu, W. , Wu, R. et al. Spatial confinement: An effective strategy to improve H2O and SO2 resistance of the expandable graphite-modified TiO2-supported Pt nanocatalysts for CO oxidation [J]. | Journal of Environmental Sciences (China) , 2025 , 148 : 57-68 .
MLA Zhu, H. et al. "Spatial confinement: An effective strategy to improve H2O and SO2 resistance of the expandable graphite-modified TiO2-supported Pt nanocatalysts for CO oxidation" . | Journal of Environmental Sciences (China) 148 (2025) : 57-68 .
APA Zhu, H. , Qiu, W. , Wu, R. , Li, K. , He, H. . Spatial confinement: An effective strategy to improve H2O and SO2 resistance of the expandable graphite-modified TiO2-supported Pt nanocatalysts for CO oxidation . | Journal of Environmental Sciences (China) , 2025 , 148 , 57-68 .
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Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization: A pilot-scale study Scopus
期刊论文 | 2025 , 151 , 529-539 | Journal of Environmental Sciences (China)
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Abstract :

As an energy and carbon saving process for nitrogen removal from wastewater, the partial nitrification and denitrification process (PN/D) has been extensively researched. However, achieving stable PN in municipal wastewater has always been challenging. In this study, a gel immobilized PN/D nitrogen removal process (GI-PN/D) was established. A 94d pilot-scale experiment was conducted using real municipal wastewater with an ammonia concentration of 43.5 ± 5.3 mg N/L at a temperature range of 11.3–28.7℃. The nitrogen removal performance and associated pathways, shifts in the microbial community as well as sludge yield were investigated. The results were as follows: the effluent TN and COD were 0.6 ± 0.4 mg/L and 31.1 ± 3.8 mg/L respectively, and the NAR exceeding 95 %. GI-PN/D achieved deep nitrogen removal of municipal wastewater through stable PN without taking any other measures. The primary pathways for nitrogen removal were identified as denitrification, simultaneous nitrification-denitrification, and aerobic denitrification. High-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor, effectively promoting the dominance and stability of the microbial communities. In addition, GI-PN/D had the characteristic of low sludge yield, with an average sludge yield of 0.029 kg SS/kg COD. This study provides an effective technical for nitrogen removal from municipal wastewater through PN. © 2024

Keyword :

Gel immobilization Sludge yield Autonomous enrichment Deep nitrogen removal Partial nitrification

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GB/T 7714 Hu, X. , Yang, H. , Fang, X. et al. Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization: A pilot-scale study [J]. | Journal of Environmental Sciences (China) , 2025 , 151 : 529-539 .
MLA Hu, X. et al. "Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization: A pilot-scale study" . | Journal of Environmental Sciences (China) 151 (2025) : 529-539 .
APA Hu, X. , Yang, H. , Fang, X. , Liu, X. , Wang, J. , Wang, X. et al. Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization: A pilot-scale study . | Journal of Environmental Sciences (China) , 2025 , 151 , 529-539 .
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Pathways of inhibition of filamentous sludge bulking by slowly biodegradable organic compounds Scopus
期刊论文 | 2025 , 150 , 104-115 | Journal of Environmental Sciences (China)
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Abstract :

The organic compound composition of wastewater, serves as a crucial indicator for the operational performance of activated sludge processes and has a major influence on the development of filamentous bulking in activated sludge. This study focused on the impact of typical soluble and slowly-biodegradable organic compounds, investigating the pathways through which these substrates affect the occurrence of filamentous bulking in systems operated under both high- and low-oxygen conditions. Results showed that slowly-biodegradable organic compounds lead to a concentrated distribution of microorganisms within flocs, with inward growth of filamentous bacteria. Both Tween-80 and granular starch treated systems exhibited a significant increase in protein content. The glucose system, utilizing soluble substrates, exhibited a markedly higher total polysaccharide content. Microbial communities in the Tween-80 and granular starch treated systems were characterized by a higher abundance of bacteria known to enhance sludge flocculation and settling, such as Competibacter, Xanthomonadaceae and Zoogloea. These findings are of high significance for controlling the operational performance and stability of activated sludge systems, deepening our understanding and providing a novel perspective for the improvement of wastewater treatment processes. © 2024

Keyword :

EPS Microbial community Slowly biodegradable organic compounds Sludge bulking Sludge morphology

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GB/T 7714 Gao, C. , Yang, F. , Tian, Z. et al. Pathways of inhibition of filamentous sludge bulking by slowly biodegradable organic compounds [J]. | Journal of Environmental Sciences (China) , 2025 , 150 : 104-115 .
MLA Gao, C. et al. "Pathways of inhibition of filamentous sludge bulking by slowly biodegradable organic compounds" . | Journal of Environmental Sciences (China) 150 (2025) : 104-115 .
APA Gao, C. , Yang, F. , Tian, Z. , Sun, D. , Liu, W. , Peng, Y. . Pathways of inhibition of filamentous sludge bulking by slowly biodegradable organic compounds . | Journal of Environmental Sciences (China) , 2025 , 150 , 104-115 .
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Heat-balance control of friction rolling additive manufacturing based on combination of plasma preheating and instant water cooling Scopus
期刊论文 | 2025 , 205 , 168-181 | Journal of Materials Science and Technology
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Friction rolling additive manufacturing (FRAM) is a solid-state additive manufacturing technology that plasticizes the feed and deposits a material using frictional heat generated by the tool head. The thermal efficiency of FRAM, which depends only on friction to generate heat, is low, and the thermal-accumulation effect of the deposition process must be addressed. An FRAM heat-balance-control method that combines plasma-arc preheating and instant water cooling (PC-FRAM) is devised in this study, and a temperature field featuring rapidly increasing and decreasing temperature is constructed around the tool head. Additionally, 2195-T87 Al-Li alloy is used as the feed material, and the effects of heating and cooling rates on the microstructure and mechanical properties are investigated. The results show that water cooling significantly improves heat accumulation during the deposition process. The cooling rate increases by 11.7 times, and the high-temperature residence time decreases by more than 50 %. The grain size of the PC-FRAM sample is the smallest, i.e., 3.77±1.03 μm, its dislocation density is the highest, and the number density of precipitates is the highest, the size of precipitates is the smallest, which shows the best precipitation-strengthening effect. The hardness test results are consistent with the precipitation distribution. The ultimate tensile strength, yield strength and elongation of the PC-FRAM samples are the highest (351±15.6 MPa, 251.3 ± 15.8 MPa and 16.25 %±1.25 %, respectively) among the samples investigated. The preheating and water-cooling-assisted deposition simultaneously increases the tensile strength and elongation of the deposited samples. The combination of preheating and instant cooling improves the deposition efficiency of FRAM and weakens the thermal-softening effect. © 2024

Keyword :

Friction rolling additive manufacturing Plasma preheating Heat accumulation Al-Li alloy Microstructure Instant cooling

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GB/T 7714 Sun, Y. , Liu, H. , Xie, R. et al. Heat-balance control of friction rolling additive manufacturing based on combination of plasma preheating and instant water cooling [J]. | Journal of Materials Science and Technology , 2025 , 205 : 168-181 .
MLA Sun, Y. et al. "Heat-balance control of friction rolling additive manufacturing based on combination of plasma preheating and instant water cooling" . | Journal of Materials Science and Technology 205 (2025) : 168-181 .
APA Sun, Y. , Liu, H. , Xie, R. , Chen, Y. , Chen, S. . Heat-balance control of friction rolling additive manufacturing based on combination of plasma preheating and instant water cooling . | Journal of Materials Science and Technology , 2025 , 205 , 168-181 .
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Bamboo-like MnO2⋅Co3O4: High-performance catalysts for the oxidative removal of toluene SCIE Scopus
期刊论文 | 2025 , 147 , 617-629 | Journal of Environmental Sciences (China)
SCOPUS Cited Count: 2
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Abstract :

The manganese-cobalt mixed oxide nanorods were fabricated using a hydrothermal method with different metal precursors (KMnO4 and MnSO4·H2O for MnOx and Co(NO3)2⋅6H2O and CoCl2⋅6H2O for Co3O4). Bamboo-like MnO2⋅Co3O4 (B-MnO2⋅Co3O4 (S)) was derived from repeated hydrothermal treatments with Co3O4@MnO2 and MnSO4⋅H2O, whereas Co3O4@MnO2 nanorods were derived from hydrothermal treatment with Co3O4 nanorods and KMnO4. The study shows that manganese oxide was tetragonal, while the cobalt oxide was found to be cubic in the crystalline arrangement. Mn surface ions were present in multiple oxidation states (e.g., Mn4+ and Mn3+) and surface oxygen deficiencies. The content of adsorbed oxygen species and reducibility at low temperature declined in the sequence of B-MnO2⋅Co3O4 (S) > Co3O4@MnO2 > MnO2 > Co3O4, matching the changing trend in activity. Among all the samples, B-MnO2⋅Co3O4 (S) showed the preeminent catalytic performance for the oxidation of toluene (T10% = 187°C, T50% = 276°C, and T90% = 339°C). In addition, the B-MnO2⋅Co3O4 (S) sample also exhibited good H2O-, CO2-, and SO2-resistant performance. The good catalytic performance of B-MnO2⋅Co3O4 (S) is due to the high concentration of adsorbed oxygen species and good reducibility at low temperature. Toluene oxidation over B-MnO2⋅Co3O4 (S) proceeds through the adsorption of O2 and toluene to form O*, OH*, and H2C(C6H5)* species, which then react to produce benzyl alcohol, benzoic acid, and benzaldehyde, ultimately converting to CO2 and H2O. The findings suggest that B-MnO2⋅Co3O4 (S) has promising potential for use as an effective catalyst in practical applications. © 2023

Keyword :

Bamboo-like morphology Hydrothermal method Manganese-cobalt mixed oxide Nanorod Toluene oxidation

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GB/T 7714 Rastegarpanah, A. , Deng, J. , Liu, Y. et al. Bamboo-like MnO2⋅Co3O4: High-performance catalysts for the oxidative removal of toluene [J]. | Journal of Environmental Sciences (China) , 2025 , 147 : 617-629 .
MLA Rastegarpanah, A. et al. "Bamboo-like MnO2⋅Co3O4: High-performance catalysts for the oxidative removal of toluene" . | Journal of Environmental Sciences (China) 147 (2025) : 617-629 .
APA Rastegarpanah, A. , Deng, J. , Liu, Y. , Jing, L. , Pei, W. , Wang, J. et al. Bamboo-like MnO2⋅Co3O4: High-performance catalysts for the oxidative removal of toluene . | Journal of Environmental Sciences (China) , 2025 , 147 , 617-629 .
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Co-Design of Mechanical and Vibration Properties of a Star Polygon-Coupled Honeycomb Metamaterial SCIE
期刊论文 | 2024 , 14 (3) | APPLIED SCIENCES-BASEL
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Abstract :

Based on the concept of component assembly, a novel star polygon-coupled honeycomb metamaterial, which achieves a collaborative improvement in load-bearing capacity and vibration suppression performance, is proposed based on a common polygonal structure. The compression simulation and experiment results show that the load-bearing capacity of the proposed metamaterial is three times more than that of the initial metamaterial. Additionally, metal pins are attached and particle damping is applied to the metamaterial to regulate its bandgap properties; the influence of configuration parameters, including the size, number, position, and material of the metal pins, on bandgaps is also investigated. The results show that the bandgap of the proposed metamaterial can be conveniently and effectively regulated by adjusting the parameters and can effectively suppress vibrations in the corresponding frequency band. Particle damping can be used to continuously adjust the frequency of the bandgap and further enhance the vibration suppression capacity of the metamaterial in other frequency bands. This paper provides a reference for the design and optimization of metamaterials.

Keyword :

star polygon-coupled honeycomb metamaterial vibration suppression mechanical properties load-bearing capacity bandgap

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GB/T 7714 Yong, Jiawang , Li, Wanting , Hu, Xiaojun et al. Co-Design of Mechanical and Vibration Properties of a Star Polygon-Coupled Honeycomb Metamaterial [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (3) .
MLA Yong, Jiawang et al. "Co-Design of Mechanical and Vibration Properties of a Star Polygon-Coupled Honeycomb Metamaterial" . | APPLIED SCIENCES-BASEL 14 . 3 (2024) .
APA Yong, Jiawang , Li, Wanting , Hu, Xiaojun , Wan, Zhishuai , Dong, Yiyao , Feng, Nenglian . Co-Design of Mechanical and Vibration Properties of a Star Polygon-Coupled Honeycomb Metamaterial . | APPLIED SCIENCES-BASEL , 2024 , 14 (3) .
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A novel model for directed energy deposition-arc based on in-order stacking of primitives SCIE
期刊论文 | 2024 , 19 (1) | VIRTUAL AND PHYSICAL PROTOTYPING
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To address the issue of low accuracy of directed energy deposition-arc (DED-Arc) and expand its use in producing large-sized components, a novel concept called "in-order stacking of primitives" has been proposed. This concept aims to simplify the additive manufacturing (AM) planning process and improve forming accuracy. Experiments at the weld, layer, and block levels examined relationships between process parameters and primitive dimensions, offset distance, and interlayer lift height. Increasing heat and mass transfer significantly increased primitive width and surface roughness but had little effect on height variation (1.95-2.27 mm). The impact of offset distance on the forming precision for layer-level components varied by the stacking path used, with Zig-Zig level parts showing more deterioration than Zig-Zag level parts. Thermal equilibrium in block components was achieved within a critical height range of 88.2 to 112.0 mm. The stacking path has a substantial impact on the surface temperature and is a crucial factor for ensure accurate workpiece formation. This study establishes a physical relationship between component forming quality and process parameters through mathematical expressions that are supported by experimental results. Future research will focus on optimizing the physical model and refining the mathematical expressions. [GRAPHICS]

Keyword :

in-orderstacking of primitives planning process Directed energy deposition-arc theoretical physical forming accuracy

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GB/T 7714 Wang, Xiaowei , Meng, Danyang , Yi, Hao et al. A novel model for directed energy deposition-arc based on in-order stacking of primitives [J]. | VIRTUAL AND PHYSICAL PROTOTYPING , 2024 , 19 (1) .
MLA Wang, Xiaowei et al. "A novel model for directed energy deposition-arc based on in-order stacking of primitives" . | VIRTUAL AND PHYSICAL PROTOTYPING 19 . 1 (2024) .
APA Wang, Xiaowei , Meng, Danyang , Yi, Hao , Yan, Zhaoyang , Xiao, Jun , Chen, Shujun . A novel model for directed energy deposition-arc based on in-order stacking of primitives . | VIRTUAL AND PHYSICAL PROTOTYPING , 2024 , 19 (1) .
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Study of the Impact of Varying Inclination Angles of Arch Ribs on the Seismic Behavior of Half-Through Steel Basket-Handle Arch Bridge SCIE
期刊论文 | 2024 , 14 (3) | BUILDINGS
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In the present study, multiscale finite element (FE) models of half-through steel basket-handle arch bridges were established. The eigenvalue analyses were conducted to explore the dynamic characteristics of the arch bridges based on the FE models. In addition, a parametric analysis was carried out to investigate the impact of the inclination angle of the arch rib (0 degrees, 4 degrees, and 7 degrees) on the longitudinal and transverse seismic performances of arch bridges. The results show that with the increase in inclination angle, the out-of-plane stiffness of half-through steel basket-handle arch bridges increases, resulting in the natural period of the structure becoming shorter from 3.09 s to 2.93 s. Adjusting the inclination angle appropriately has a beneficial impact on the overall seismic performance of the structures, affecting both displacement and internal forces, in which the most significant improvements include a 42.8% decrease in displacement and a 62.6% reduction in internal forces. Adjusting the inclination angle can cause the arch springing and transverse brace to undergo larger plastic deformation. It is advisable to judiciously enlarge the sectional dimensions and enhance the material strength of both the arch springing and the transverse bracing in seismic designs.

Keyword :

seismic performance multiscale finite element model inclination angle time history analysis basket-handle arch bridge

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GB/T 7714 Sun, Jubo , Chen, Siyao , Wang, Zhanfei et al. Study of the Impact of Varying Inclination Angles of Arch Ribs on the Seismic Behavior of Half-Through Steel Basket-Handle Arch Bridge [J]. | BUILDINGS , 2024 , 14 (3) .
MLA Sun, Jubo et al. "Study of the Impact of Varying Inclination Angles of Arch Ribs on the Seismic Behavior of Half-Through Steel Basket-Handle Arch Bridge" . | BUILDINGS 14 . 3 (2024) .
APA Sun, Jubo , Chen, Siyao , Wang, Zhanfei , Sui, Weining , Zhang, Qiang . Study of the Impact of Varying Inclination Angles of Arch Ribs on the Seismic Behavior of Half-Through Steel Basket-Handle Arch Bridge . | BUILDINGS , 2024 , 14 (3) .
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A Review of Life Cycle Construction Process and Cutting-Edge Technology in Prefabricated MEP Installation Engineering SCIE
期刊论文 | 2024 , 14 (3) | BUILDINGS
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Prefabricated installation, a pivotal study in the realm of contemporary construction practices, delves into the utilization of prefabrication within mechanical, electrical, and plumbing (MEP) systems. Despite its ascending prominence, the domain grapples with ambiguities in application pathways, uncertain developmental trajectories, and the absence of a holistic technical paradigm. This research endeavors to bridge these gaps by conducting a thorough and multidimensional investigation into the current landscape of prefabricated MEP installation initiatives. This study meticulously dissects the paradigm from five critical vantage points: historical evolution, standards and regulations, life cycle analysis, technological applications, and corporate implementation strategies. At present, there is still a lack of standards and specifications specifically for the field of assembled MEP installation. The analysis reveals a trend towards intelligent and sustainable installation practices in prefabricated MEP projects. The research predominantly focuses on the design, production, and installation stages. Notably, building information modeling (BIM) emerges as the most prominent technology, followed by the Internet of Things (IoT) and 3D laser scanning, with extended reality (XR) technologies gaining traction. Large, state-owned construction firms are spearheading innovative applications in this realm. In summary, this paper provides an overview and outlook for the development direction and the application of cutting-edge technologies in prefabricated MEP installation projects, with the aim of supporting the industry's advancement.

Keyword :

cutting-edge technology BIM MEP installation life cycle prefabricated MEP

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GB/T 7714 Yan, Gangwen , Yang, Yinghui , Zhang, Huizhong et al. A Review of Life Cycle Construction Process and Cutting-Edge Technology in Prefabricated MEP Installation Engineering [J]. | BUILDINGS , 2024 , 14 (3) .
MLA Yan, Gangwen et al. "A Review of Life Cycle Construction Process and Cutting-Edge Technology in Prefabricated MEP Installation Engineering" . | BUILDINGS 14 . 3 (2024) .
APA Yan, Gangwen , Yang, Yinghui , Zhang, Huizhong , Li, Zhenwei , Chen, Song , Zhao, Xuefeng et al. A Review of Life Cycle Construction Process and Cutting-Edge Technology in Prefabricated MEP Installation Engineering . | BUILDINGS , 2024 , 14 (3) .
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Learning Rates of Deep Nets for Geometrically Strongly Mixing Sequence SCIE
期刊论文 | 2024 | IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS
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The great success of deep learning poses an urgent challenge to establish the theoretical basis for its working mechanism. Recently, research on the convergence of deep neural networks (DNNs) has made great progress. However, the existing studies are based on the assumption that the samples are independent, which is too strong to be applied to many real-world scenarios. In this brief, we establish a fast learning rate for the empirical risk minimization (ERM) on DNN regression with dependent samples, and the dependence is expressed in terms of geometrically strongly mixing sequence. To the best of our knowledge, this is the first convergence result of DNN methods based on mixing sequences. This result is a natural generalization of the independent sample case.

Keyword :

Estimation Approximation error alpha-mixing sequences nonindependent and identically distributed (IID) data Learning systems Artificial neural networks Upper bound Convergence deep neural nets learning theory Training generalization

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GB/T 7714 Men, Yueyang , Li, Liang , Hu, Ziqing et al. Learning Rates of Deep Nets for Geometrically Strongly Mixing Sequence [J]. | IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS , 2024 .
MLA Men, Yueyang et al. "Learning Rates of Deep Nets for Geometrically Strongly Mixing Sequence" . | IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS (2024) .
APA Men, Yueyang , Li, Liang , Hu, Ziqing , Xu, Yongli . Learning Rates of Deep Nets for Geometrically Strongly Mixing Sequence . | IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS , 2024 .
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