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The Field Monitoring and Numerical Simulation of Spatiotemporal Effects During Deep Excavation in Mucky Soft Soil: A Case Study

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APPLIED SCIENCES-BASEL 2025年第4期15卷 1992-1992页

作者： Wu, Qiang Wang, Jianxiu Long, Yanxia Liu, Xuezeng Long, Guanhong Ding, Shuang Zhou, Li Li, Huboqiang bin Hishammuddin, Muhammad Akmal Hakim Suzhou Metro Line 1 Co Ltd Suzhou 215300 Peoples R China Tongji Univ Coll Civil Engn Shanghai 200092 Peoples R China Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 Peoples R China Shanghai Tongyan Civil Engn Technol Co Ltd Shanghai 200092 Peoples R China

The issue of geotechnical hazards induced by excavation in soft soil areas has become increasingly prominent. However, the retaining structure and surface settlement deformation induced by the creep of soft soil and spatial effect of the excavation sequence are not fully considered where only elastic-plastic deformation is used in design. To understand the spatiotemporal effects of excavation-induced deformation in soft soil pits, a case study was performed with the Huaxi Park Station of the Suzhou Metro line S1, Jiangsu Province, China, as an example. Field monitoring was conducted, and a three-dimensional numerical model was developed, taking into account the creep characteristics of mucky clay and spatiotemporal response of retaining structures induced by excavations. The spatiotemporal effects in retaining structures and ground settlement during excavation processes were analyzed. The results show that as the excavation depth increased, the horizontal displacement of the diaphragm walls increased linearly and tended to exhibit abrupt changes when approaching the bottom of the pit. The maximum horizontal displacement of the wall at the west end well was close to 70 mm, and the maximum displacement of the wall at the standard section reached approximately 80 mm. The ground settlement on both pit sides showed a "trough" distribution pattern, peaking at about 12 m from the pit edge, with a settlement rate of -1.9 mm/m per meter of excavation depth. The excavation process directly led to the lateral deformation of the diaphragm walls, resulting in ground settlement, which prominently reflected the time-dependent deformation characteristics of mucky soft soil during the excavation process. These findings provide critical insights for similar deep excavation projects in mucky soft soil, particularly regarding excavation-induced deformations, by providing guidance on design standards and monitoring strategies for similar geological conditions.

关键词： mucky soft soil deep excavation spatiotemporal effects field monitoring numerical simulation

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Artwork Recommendations Based on User Preferences: Integrating Clustering Analysis with Visual Features

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ACM JOURNAL ON COMPUTING AND CULTURAL HERITAGE 2024年第3期17卷 1-10页

作者： Kim, Eunhoo Cha, Junyeop Jeong, Dahye Park, Eunil LINE Plus Corp 15FBundang Sq42Hwangsaeul Ro 360 Beon Gil Seongnam Si Gyeonggi South Korea Sungkyunkwan Univ Dept Appl Artificial Intelligence 310 Int Hall25-2 Sungkyunkwan Ro Seoul 03063 South Korea Univ Jaume 1 Robot Intelligence Lab Castel lon De La Plana 12071 Spain

Recently, recommendation systems have become one of the important elements for sales and marketing, and their application is almost essential in the shopping and cultural industries. Despite the increase in online exhibitions and the growing audience engaging with artworks in digital spaces, the utilization of artwork recommendation systems remains inadequate. Thus, this study proposes an artwork recommendation system, which provides artwork groups based on a visual clustering technique and user preferences with WikiArt datasets. The visual attributes of artworks were extracted using VGG16, and k-means clustering was utilized to group a set of images according to their feature similarities. To generate recommendations, new artworks were randomly selected from particular clusters, taking into account users' preferences. Then, an experiment was conducted to investigate whether the recommended artworks satisfied the users. The statistical results indicate that users' perceived satisfaction with the recommended artworks is notably more positive compared to their satisfaction with traditional suggested artworks. Based on this study's findings, we present implications and limitations for future research. CCS Concepts: center dot Applied computing -> Fine arts

关键词： Additional key Words and Phrases Recommendation system clustering artwork recommendation preference-based recom- mendation

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Ground deformation induced by shield tunneling posture in soft soil

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TUNNELLING AND UNDERGROUND SPACE technology 2023年第1期139卷

作者： Jin, Hui Yuan, Dajun Jin, Dalong Wu, Jin Wang, Xuyang Han, Bingyu Mao, Jiahua Beijing Jiaotong Univ Minist Educ Key Lab Urban Underground Engn Beijing 100044 Peoples R China Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China Suzhou Rail Transit Shiyu Line 1 Co Ltd Kunshan 215007 Peoples R China

Constructing tunnels in soft soil using shield machines would induce soil deformation. Several factors, such as support pressure, ground loss, grouting pressure may affect the soil deformation. In engineering practice, the ground deformation could also vary with the posture of the shield machine. This study proposed an approach for estimating the soil deformation considering shield posture. Firstly, the shield-soil interaction displacement was obtained by considering shield geometry and its kinematic behavior, such as shield diameter and length, articulation, and shield deviation. Secondly, based on the elastic half-space theory, a calculation method for mapping the shield-soil interaction displacement to soil deformation was established. Finally, the proposed model was verified by the field measurement in the tunnel of Suzhou Metro line S1, and the results confirm that the postures of the shield machine in the soil influence the magnitude, distribution, and evolution of the soil deformation.

关键词： Shield construction Ground deformation Shield -soil interaction Shield posture Elastic half -space theory

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Preparation of superamphiphobic stainless steel surface by laser and perfluorooctanoic acid treatment

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OPTICS AND LASER technology 2022年 154卷

作者： Ma, Wenjian Zhao, Menglei Zhao, Jingnan Guo, Zhiquan Cui, Yuanchen Li, Huiping Tianjin Univ Sci & Technol Tianjin Peoples R China Tianjin Key Lab Integrated Design & On Line Monit Tianjin Peoples R China US Polyco 3901 1-45 South Ennis TX 75119 USA

A kind of stainless steel surface with superhydrophobic and superoleophobic were prepared by nanosecond laser. The surface of 304stainless steel was ablated by laser to obtain micro-nano structure, and then the surface energy of the sample was reduced by using the aqueous solution of perfluorooctanoic acid (PFOA) to obtain the special wettability surface. The contact angles (CA) of 5 mu L of water, glycerol, peanut oil and hexadecane were 165.77 degrees, 155.09 degrees, 155.24. and 152.83 degrees respectively, and the sliding angles (SA) were about 1 degrees, 2 degrees, 4 degrees and 10 degrees respectively. The surface of the sample was analyzed and characterized by SEM, EDS, FTIR and other testing equipment. The influence of single variable on wettability was studied by controlling the scanning interval, speed, heating temperature, soaking time and so on. The samples obtained by this method have good self-cleaning, wear resistance and stability, and can still maintain good superhydrophobic and superhydrophobic properties under natural conditions for up to two months.

关键词： Laser ablation Stainless steel Superhydrophobic Superoleophobic PFOA

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Quantum network security dependent on the connection density between trusted nodes

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JOURNAL OF OPTICAL COMMUNICATIONS AND networking 2022年第11期14卷 934-943页

作者： Gaidash, Andrei Miroshnichenko, George Kozubov, Anton Russian Acad Sci Steklov Math Inst Dept Math Methods Quantum Technol 8 Gubkina St Moscow 119991 Russia ITMO Univ Lab Quantum Proc & Measurements 3b Kadetskaya Line St Petersburg 199034 Russia ITMO Univ Natl Ctr Quantum Internet Leading Res Ctr 49 Kronverksky Prospekt St Petersburg 197101 Russia SMARTS Quanttelecom LLC 59-1-B 6th Line Vasilievsky Isl St Petersburg 199178 Russia ITMO Univ Waveguide Photon Res Ctr 49 Kronverksky Prospekt St Petersburg 197101 Russia ITMO Univ Inst High Sch Engn 49 Kronverksky Prospekt St Petersburg 197101 Russia

Besides true quantum repeaters, a trusted node paradigm seems to be inevitable for practical implementations (at least in the short term), and one should consider configurations of trusted nodes as the basis for global quantum networks. In this paper, we estimate how the introduction of additional connections between trusted nodes through one, two, etc., nodes (i.e., connection density) to a quantum network with serial connections of trusted nodes affects its security. We provide proper scaling of the failure probability of authentication and quantum key distribution protocols to the level of the whole quantum network. Expressions of the failure probability dependent on the total number of connected nodes between users and the connection density for the given mean failure probability of each element are derived. The result provides an explicit trade-off between an increase of key transport security and a consequent increase of spent resources. We believe that the obtained result may be useful for both the design of future networks and optimization of existing ones.

关键词： Quantum networks Authentication Routing protocols Transport protocols Visualization Solids Routing

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Determination of thrusts for different cylinder groups during shield tunneling

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TUNNELLING AND UNDERGROUND SPACE technology 2022年第0期127卷

作者： Wang, Xuyang Yuan, Dajun Jin, Dalong Jin, Hui Yang, Yi Wu, Jin Beijing Jiaotong Univ Key Lab Urban Underground Engn Minist Educ Beijing 100044 Peoples R China Beijing Jiaotong Univ Dept Civil Engn Beijing 100044 Peoples R China Suzhou Rail Transit Line S1 Co Ltd Suzhou 215300 Peoples R China

The hydraulic thrust system that emphasizes grouped controlling of the shield machine is used for driving forward and pose adjustment. To control and regulate the pose of the shield machine precisely, it is of great significance to solve the total thrust and grouped thrusts (thrusts for different cylinder groups) reasonably. This study aims to develop a novel thrust model to calculate the total thrust and grouped thrust. Firstly, a soil-machine interaction model is developed to predict the loads acting on the shield machine during tunneling. Then an inverse kinematic analysis is performed to describe the velocity Jacobian and soil displacement induced by pose adjustment. Based on the kinematic mechanism of the shield machine under soil resistance, a thrust model is proposed to determine the total thrust and grouped thrusts employing static mechanics. In this model, both the soil properties and the shield parameters, such as operating parameters, pose parameters and geometric parameters are considered. The proposed thrust model is verified through a case application and the results indicate that the model could be used for assessing the total thrust and grouped thrusts during shield tunneling, which provides a theoretical basis for pose adjustment and automatic trajectory tracking control of the shield machine.

关键词： Shield machine Grouped thrusts Load model Kinematic analysis Pose adjustment

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WO3 films prepared by anodic oxidation in acid electrolytes and their photocatalytic activity of organic dye degradation

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2022年第6期33卷 2921-2931页

作者： Hao, Liang Li, Fei Hu, Te Hu, Yifei Zhao, Qian Guan, Sujun Lu, Yun Tianjin Key Lab Integrated Design & Line Monitori Tianjin Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Tianjin Int Joint Res & Dev Ctr Low Carbon Green Tianjin Peoples R China Foshan Univ Sch Mat Sci & Hydrogen Energy 18 Jiangwanyilu Foshan 528000 Peoples R China Toyo Univ Bionano Elect Res Ctr 2100 Kujirai Kawagoe Saitama 3508585 Japan Chiba Univ Grad Sch Sci & Engn Inage Ku 1-33 Yayoi Cho Chiba 2638522 Japan

We prepared two kinds of WO3 films with different surface morphologies by anodic oxidation in two types of electrolytes. In the electrolyte of NaF + HF aqueous solution, WO3 nanotube array films were prepared. Meanwhile, films consist of flower-like WO3 nanoplates formed in the electrolyte of NaF + H2SO4. The former films had a longer lifetime of charge carriers, more negative VBM and CBM positions, and a lower charge transfer resistance than the latter. On the contrary, the latter possessed a smaller band gap, a greater photocurrent density, and more active radicals, including OH and.O-2(-). The comprehensive effect of the above factors resulted in the very similar photocatalytic activity of the two kinds of WO3 films in MB degradation under visible-light irradiation. The results of radical trapping experiments indicate that hydroxyl radicals played a crucial role in the photocatalytic degradation of MB dye. In addition, superoxide radicals, as an intermediate medium of hydroxyl radicals, also acted as an essential part. The hydroxyl radicals were generated by the single-electron or multi-electron transfer of O-2 rather than the reaction between photogenerated holes and OH-.

关键词： Electrolytes

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Coordinated control of rotor kinetic energy and pitch angle for large-scale doubly fed induction generators participating in system primary frequency regulation

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IET RENEWABLE POWER GENERATION 2021年第8期15卷 1836-1847页

作者： Yang, Peihong He, Bin Wang, Biao Dong, Xiaoling Liu, WenYing Zhang, Jihong Wu, ZhenKui Liu, Jing-Xia Qin, Zhigang Inner Mongolia Univ Sci & Technol Sch Informat Engn Baotou 014010 Peoples R China Inner Mongolia Univ Sci & Technol Inner Mongolia Key Lab Solar & Wind Power Baotou 014010 Peoples R China Southwest Jiatong Univ Sch Elect Engn Chengdu 610000 Peoples R China North China Elect Power Univ Sch Elect & Elect Engn Beijing 102206 Peoples R China ON Semicond Ind & Off Line Power Div 2-1-1 Osaki Tokyo 1416006 Japan

This paper presents a control strategy of large-scale wind-thermal power joint primary frequency regulation. First, an integrated control strategy is established rotor kinetic energy control and pitch angle control for wind turbine generators participation in frequency regulation within a wide range of wind velocity;Second, a fuzzy PI controller is designed for the recovery control of the wind turbine, which can avoid the occurrence of the frequency secondary drop accident during the wind generator exits the frequency regulation. Third, an optimal allocation power strategy of wind generator frequency modulation based on weighting factors is proposed in different operating conditions to make full use of the frequency modulation capability of wind turbine rotor kinetic energy control, and the strategy of orderly exiting the frequency modulation of the wind generators is established. Finally, the control framework for proposing the strategy is constructed to enhance the primary frequency regulation ability of large-scale wind generators connected to power systems. The feasibility of proposing the strategy is verified by two examples. The results show that the presented strategy is able to heighten the characteristics of the power system frequency response availably and provide a reference for power system scheduling with large-scale wind power.

关键词： Wind power plants Asynchronous machines Frequency control Control of electric power systems Power system control Fuzzy control

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Preparation, parameter optimization of anodized ZnO films and their photocatalytic performance in organic dye degradation in wastewater

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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 2022年第8期128卷 1-12页

作者： Zhu, Enlong Li, Fei Zhao, Qian Hu, Te Guan, Sujun Lu, Yun Hao, Liang Tianjin Key Lab Integrated Design & On Line Monit Tianjin 300222 Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu Nanlu Tianjin 300222 Peoples R China Tianjin Int Joint Res & Dev Ctr Low Carbon Green Tianjin 300222 Peoples R China Foshan Univ Coll Mat Sci & Hydrogen Energy Engn 18 Jiangwanyilu Foshan 528000 Guangdong Peoples R China Toyo Univ BioNano Elect Res Ctr 2100 Kujirai Kawagoe Saitama 3508585 Japan Chiba Univ Grad Sch Sci & Engn 1 33Yayoi choInage ku Chiba 2638522 Japan

Photocatalytic ZnO films were prepared by facile anodization followed by annealing. The influence of some processing parameters, including applied potential, anodization time, electrolyte concentration, and annealing temperature, on the resultants' composition and photocatalytic activity of the prepared films, was investigated. The XRD, Raman spectra, and SEM analysis show that the nano-sized grass-like microstructure was formed with nanowires or nanorods. The films were composed of ZnO and Zn-5(CO3)(2)(OH)(6). Higher applied potential, longer anodization time, and higher electrolyte concentration made for the formation of ZnO, leading to higher photocatalytic activity. Higher annealing temperature decreased the defects and thereby increased the crystallinity of ZnO. Higher crystallinity restrained the recombination of photogenerated charge carriers;thereby, enhancing the photocatalytic activity. However, a high annealing temperature, even at 523 K, led to the adhesion decrease of the prepared films on Zn foils and thereby the films' exfoliation. That decreased the photocatalytic performance of the as-annealed films. Therefore, the annealing temperature has a moderate value to achieve the optimal photocatalytic performance. The present systematic study on the preparation and processing parameters of ZnO by anodization followed by annealing has helpful guiding significance for the fabrication of photocatalyst films with high photocatalytic performance.

关键词： ZnO films Photocatalyst Anodization Annealing Processing parameter

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g-C3N4/In2O3 heterojunction films and their excellent photocatalytic performance in fruit preservation and organic dye degradation

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JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2024年第2期12卷

作者： Hao, Liang Wang, Chunyang Zhao, Qian Hu, Te Wang, Zizhen Guan, Sujun Lu, Yun Tianjin Key Lab Integrated Design & line Monitorin Tianjin 300222 Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn 1038 Dagu NanluHexi Dist Tianjin 300222 Peoples R China Tianjin Int Joint Res & Dev Ctr Low Carbon Green P Tianjin 300222 Peoples R China Foshan Univ Coll Mat Sci & Hydrogen Energy Engn 18 Jiangwanyilu Foshan 528000 Guangdong Peoples R China Tianjin Univ Sci & Technol Coll Biotechnol 2913th StTeda Tianjin 300457 Peoples R China Tokyo Univ Sci Res Ctr Space Syst Innovat 2641Yamazaki Noda Chiba 2788510 Japan Chengdu Technol Univ Sch Technol Univ 2Huapaifang St Chengdu 610031 Peoples R China Chiba Univ Coll Mech Engn & Grad Sch 1-33Yayoi ChoInage Ku Chiba 2638522 Japan

We prepared g-C3N4/In2O3 composite films on the wire mesh of stainless steel by a hydrothermal method combined with annealing. XRD, SEM, and XPS results confirmed the heterojunction formation of g-C3N4/In2O3. UV-vis spectroscopy showed that the heterojunction films exhibited enhanced visible light absorption capacity compared with the pristine In2O3 films. Compared with the individual In2O3 films, the PL intensity of the g-C3N4/ In2O3 composite films was remarkably reduced, their photocurrent density was significantly increased, and the semicircle in EIS plots was reduced. All the above changes are attributed to the heterojunction formation between g-C3N4 and In2O3. According to our proposed mechanism, photogenerated electrons transfer from g-C3N4 to In2O3 while the holes move in the opposite direction. Therefore, the spatial transfer and separation of photoinduced electrons and holes was achieved. In other words, the recombination efficiency of photogenerated electrons and holes was remarkably suppressed. In photocatalytic RhB degradation, g-C3N4/In2O3 heterojunction films exhibited much higher photocatalytic activity than the pristine In2O3 films. In our self-made photocatalytic fruit-preservation system, these g-C3N4/In2O3 heterojunction films showed excellent fruit preservation ability. Specifically, the bananas remained turquoise green without turning yellow or black spots, even black patches, after a seven-day evaluation period.

关键词： G-C3N4/In2O3 Heterojunction Film Photocatalytic activity Fruit preservation

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