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Effect of Progressive Substitution of Cement and Lime by Powdered Shells Used as a Curing Agent for Dredged Soil in a Port Area

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 88-102页

作者： SUN Yang WANG Faxin SU Yaying LI yiwei HE Feng College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Huai'an Research Institute Hohai UniversityHuai'an 223025China Jiangsu Fangyang Industrial Investment Corp.Ltd. Lianyungang 210098China

This study aimed to address the challenges of solid waste utilization,cost reduction,and carbon reduction in the treatment of deep-dredged soil at Xuwei Port in Lianyungang city of *** research in this area was ***,a curing agent made from powdered shells was used to solidify the dredged soil in *** employed laboratory orthogonal tests to investigate the physical and mechanical properties of the powdered shell-based curing *** was collected by conducting experiments to assess the role of powdered shells in the curing process and to determine the optimal ratios of powdered shells to solidified soil for different *** development of strength in solidified soil was studied in both seawater and pure water *** study revealed that the strength of the solidified soil was influenced by the substitution rate of powdered shells and their interaction with *** cement content had a positive effect on *** high-strength solidified soil,the recommended ratio of wet soil:cement:lime:powdered shells were 100:16:4:4,while for low-strength solidified soil,the recommended ratio was 100:5.4:2.4:***,under appropriate conditions,improved short-term strength by promoting the formation of expansive ettringite minerals that contributed to cementation and *** findings suggest that the combination of cement and powdered shells is synergistic,positively affecting the strength of solidified *** recommended ratios provide practical guidance for achieving desired strength levels while considering factors such as cost and carbon *** role of seawater in enhancing short-term strength through crystal formation is noteworthy and can be advantageous for certain *** conclusion,this research demonstrates the potential of using a powdered shell-based curing agent for solidifying dredged soil in an environmentally friendly and cost-effective *** recommended ratios for different str

关键词： carbon reduction and solidification dredged soil abandoned shells orthogonal test chemical additives(lime and cement) unconfined compressive strength(UCS)

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Enhancing forecasting of current-carrying performance through spatial frequency analysis of interface morphology

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Science China Technological Sciences 2025年

作者： Nian YIN Zishuai WU Zhangli HOU yiwei ZHANG Zhinan ZHANG State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University School of Mechanical Engineering Shanghai Jiao Tong University

Electrical contact interfaces, integral to devices such as connectors, switches, and conductive slip rings, play a crucial role in determining current-carrying capabilities. This study adopts spatial frequency analysis to assess the currentcarrying performance of interfaces based on their morphological characteristics. Initially, rough surfaces with various parameters, including the cutoff frequency(N), the spectral index(β), and the gain factor(A), were generated using spatial frequency methods, followed by current-carrying simulations. The findings reveal that the characteristic parameters derived from spatial frequency methods exhibit a significantly stronger correlation with current-carrying performance than traditional roughness metrics. To enhance the practical applicability of this research, a physical-informed machine learning approach for rough surface features extraction was developed, demonstrating high predictive parameter identification accuracy for the three parameters. Overall, this paper introduces a tribo-informatics approach for analyzing and extracting rough surface features that considers the curvature characteristics of contact points. This approach holds significant potential for evaluating the processing state of current-carrying interfaces, selecting high-quality surfaces, and forecasting current-carrying performances.

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Modeling and control of a rigid-flexible coupling robot for narrow space manipulations

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Science China Technological Sciences 2025年

作者： Kuangda CHEN Huan ZHAO Jiexin ZHANG Mei FENG yiwei WANG Jinliang WANG Han DING State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and Technology Key Laboratory of CNC Equipment Reliability Ministry of Education Jilin University School of Medical Equipment Science and Engineering Huazhong University of Science and Technology

Narrow space manipulations are crucial for equipment maintenance, as they eliminate the need for disassembly, thus reducing costs and increasing efficiency. Cable-driven flexible robots possess exceptional capabilities in maneuvering through narrow spaces, thanks to their interaction compliance and distal dexterity. However, their inherent low stiffness causes a decline in the location accuracy of the robot and could even lead to manipulation failure. To address this challenge, this paper proposes a novel type of rigid-flexible coupling robot, which increases the stiffness of the robot while ensuring the reachability within a narrow space. To achieve high-accuracy location in a narrow space, kinematic and control methods are proposed. Specifically,the robot forward kinematics are uniformly represented, and the closed-form inverse kinematics solution is derived. Furthermore, in cases where the robot?s structure fails to align with Pieper?s solution, a two-stage search strategy is utilized to solve the inverse kinematics, resulting in a high success rate of 99.1%. Based on the proposed kinematics, a rigid-dominated control method is then proposed to facilitate localization and pose alignment of target objects in narrow spaces. The practical comparative experiments show that the proposed robot has the capability of high accuracy control in narrow spaces.

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Effect of Progressive Substitution of Cement and Lime by Powdered Shells Used as a Curing Agent for Dredged Soil in a Port Area

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期 88-102页

作者：孙阳 WANG Faxin SU Yaying LI yiwei HE Feng College of Harbour Coastal and Offshore Engineering Hohai University Huai'an Research Institute Hohai University Jiangsu Fangyang Industrial Investment Corp. Ltd.

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城市轨道交通全要素生产率研究——基于三阶段DEA-Malmquist模型

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科学技术创新 2025年第1期 33-38页

作者：周逸薇南京地铁集团有限公司江苏南京

为全面准确研究我国城市轨道交通运行效率,选取轨道交通运营里程超过100 km的25个城市作为决策单元,利用三阶段DEA-Malmquist模型通过对2017-2019年我国城市轨道交通运行效率进行研究。Malmquist指数模型实证结果表明,2017-2022年我国... 详细信息

为全面准确研究我国城市轨道交通运行效率,选取轨道交通运营里程超过100 km的25个城市作为决策单元,利用三阶段DEA-Malmquist模型通过对2017-2019年我国城市轨道交通运行效率进行研究。Malmquist指数模型实证结果表明,2017-2022年我国铁路运输业全要素生产率发生了小幅度的负增长。其中,北京、上海、广州、深圳这四个行业老牌领头城市,轨道交通产业经过多年发展,人员冗余、设备老化等弊端日益凸显,全要素生产率发生了下降;而大连、长春、昆明、南昌等正处于高速发展阶段的城市,所投入的能耗、人员等要素转化成相应产出的效率更高,全要素生长率总体实现了正增长。总体来看,轨道交通因高投入、低回报的准公益性的特征,叠加2020年左右爆发的疫情,全要素生产率发生下降是可预料到的。下一阶段,应更加理性对待规模扩大,重点要加强技术创新来改善这一局面。

关键词：城市轨道交通三阶段DEA Malmquist指数

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Enhanced plasmonic absorption of Pt cuboctahedra-WO_(3)nanohybrids used as visible light photocatalysts for overall water splitting

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Nano Research 2023年第4期16卷 5919-5928页

作者： Qiaoling Chen yiwei Tan State Key Laboratory of Materials-Oriented Chemical Engineering School of Chemistry and Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Localized surface plasmon resonance(LSPR)effects of nanoscale plasmonic metals/semiconductor composites have been extensively applied into visible light ***,Pt nanoparticles(NPs)with the visible LSPR absorption maxima have rarely been used as a photosensitizer to facilitate photocatalytic reactions,especially the photocatalytic overall water splitting(POWS)reaction,presumably because they feature weak light ***,we present that the increased plasmonic absorption and local field enhancement can be achieved in the wide visible range by exploiting the simulated and experimental expressions of Pt nanocuboctahedra and Pt cuboctahedra-WO_(3)nanohybrids(Pt-WO3).First,monodisperse Pt cuboctahedra with different sizes,a hierarchical WO_(3)nanoarchitecture composed of radially patterned WO_(3)nanopillars,and Pt-WO_(3)were systematically ***,visible plasmonic Pt-WO_(3)photocatalysts were employed in the POWS tests and exhibited the significant activity enhancement in the visible light *** apparent quantum efficiency(AQE)of greater than 7%within the range of visible light has been achieved for the optimal Pt-WO3.

关键词： localized surface plasmon resonance plasmonic photocatalysis overall water splitting plasmonic Pt nanoparticles WO_(3)

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The numerical investigation of flow and heat transfer characteristics of flow past a slit-cylinder

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Science China(Technological Sciences) 2017年第4期60卷 602-612页

作者： WANG JianSheng DONG yiwei Key Laboratory of Efficient Utilization of Low and Medium Grade Energy MOE School of Mechanical Engineering Tianjin University Tianjin 300072 China

The flow and heat transfer characteristics, including transition critical Reynolds number from two-dimensional to three-dimensional, the influence of slit-cylinder geometric parameter on Strouhal number, Nusselt number and forces acting on the slit-cylinder are numerically investigated. It's found that transition critical Reynolds number from two-dimensional(flow wake deforms in two directions) to three-dimensional(flow wake deforms in three directions) increases with the augment of the slit width ratio in the range of present considered Reynolds number. The present results indicate that the three-dimensional vortex structures resulting from the deformation of the vortex shedding have significant effects on flow and heat transfer features such as Strouhal number, Nusselt number and forces acting on the cylinders with different ratios of slit width. It's observed that the drag and lift coefficients reduce as the increase of slit width ratio, and vortex shedding is effectively suppressed by the ***, the comprehensive heat transfer performance of the cylinder with the slits is significantly improved with the increase of the slit width ratio.

关键词： numerical slit-cylinder critical reynolds number three-dimensional feature vortex shedding

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Hierarchical CoNiSe2 nano-architecture as a high- performance electrocatalyst for water splitting

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Nano Research 2018年第3期11卷 1331-1344页

作者： Tao Chen yiwei Tan State Key Laboratory of Materials-Oriented Chemical Engineering School of Chemistry and Chemical Engineering Nanjing TechUniversity Nanjing 210009 China

Hierarchical nano-architectures comprised of ultrathin ternary selenide （CoNiSe2） nanorods were directly grown on nickel foam （NF）. The integrated CoNiSe2/NF functions as a robust electrocatalyst with an extremely high activity and stability for emerging renewable energy technologies, and electrochemical oxygen and hydrogen evolution reactions （OER and HER, respectively）. The overpotentials required to deliver a current density of 100 mA·cm^-2 are as low as 307 and 170 mV for the OER and HER, respectively; therefore, the obtained CoNiSe2 is among the most promising earth-abundant catalysts for water splitting. Furthermore, our synthetic sample validates a two-electrode electrolyzer for reducing the cell voltage in the full water splitting reaction to 1.591 V to achieve a current density of 10 mA·cm^-2, which offers a novel inexpensive, integrated selenide/NF electrode for electrocatalytic applications.

关键词： bifunctional catalysts electrocatalysis nanostructures ternary selenide water splitting

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Improving maize residue cover estimation with the combined use of optical and SAR remote sensing images

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International Soil and Water Conservation Research 2024年第3期12卷 578-588页

作者： yiwei Zhang Jia Du Northeast Institute of Geography and Agroecology CASChangchunJilin130102China

Conservation tillage is an important conservation measure for arable land in modern agricultural pro-duction,which plays an essential role in protecting black soil and improving the quality of arable *** estimation of maize residue cover(MRC)can be used to obtain the spatial distribution characteristics of conservation tillage,which is essential for government departments to promote conservation tillage technology and understand the implementation of *** this paper the southern part of the Songnen Plain was used as the study area,and Sentinel-2 MSI images and Sentinel-1 SAR images were used as data sources to correlate the spectral indices and radar backscatter coefficients with the field sampling data in the study *** MRC estimation model of the study area was constructed using the Random Forest(RF)model,the Multiple Linear Stepwise Regression(MLSR)model,and Back Propagation Neural Network(BPNN)model,*** results of the study showed that the correlation coefficients of normalized difference tillage index(NDTI),simple tillage index(STI),normalized difference index(NDI5),NDI7,shortwave infrared normalized difference residue index(SINDRI),normalized difference senescent vegetation index(NDSVI),normalized difference residue index 2(NDRI2),NDRI3,NDRI4,NDR15,NDRI6,NDRI7,NDR18,NDRI9,and MRC in the study area were greater than 0.4,and the correlation coefficients were higher for NDTI and STI,which reached 0.861 and 0.860,*** correlation coefficient between W and MRC was 0.56 and between VH and MRC was *** used MLSR,RF,and BPNN methods in combination with Sentinel-2 MSI images and Sentinel-1 SAR images for MRC *** synergistic use of Sentinel-2 MSI images and Sentinel-1 SAR images helped to improve the accuracy of the MRC estimation models and the correlation coefficient R2 of all three models to greater than *** on the statistical analysis of remote sensing estimation results,we found that the average value of the M

关键词： Maize residue cover Sentinel-1 Sentinel-2ML SRBPNNRF

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A froth velocity measurement method based on improved U-Net++semantic segmentation in flotation process

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1816-1827页

作者： yiwei Chen Degang Xu Kun Wan School of Automation Central South UniversityChangsha 410083China

During flotation,the features of the froth image are highly correlated with the concentrate grade and the corresponding working *** static features such as color and size of the bubbles and the dynamic features such as velocity have obvious differences between different working *** extraction of these features is typically relied on the outcomes of image segmentation at the froth edge,making the segmentation of froth image the basis for studying its visual ***,the absence of scientifically reliable training data with label and the necessity to manually construct dataset and label make the study difficult in the mineral *** solve this problem,this paper constructs a tungsten concentrate froth image dataset,and proposes a data augmentation network based on Conditional Generative Adversarial Nets(cGAN)and a U-Net++-based edge segmentation *** performance of this algorithm is also evaluated and contrasted with other algorithms in this *** the results of semantic segmentation,a phase-correlationbased velocity extraction method is finally suggested.

关键词： froth flotation froth segmentation froth image data augmentation velocity extraction image features

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