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Multistage seismic damage constitutive model and parameter calibration of reinforced concrete columns

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Journal of Southeast University(English Edition) 2024年第4期40卷 386-395页

作者： Xing Chenxi shu yiwei Zhu Xiaojie Zhong Jian School of Law Southeast UniversityNanjing 210096China School of Civil Engineering Hefei University of TechnologyHefei 230009China Key Laboratory of Concrete and Pre-stressed Concrete Structures of Ministry of Education Southeast UniversityNanjing 210096China

The road traffic network contains a large number of bridges,and calculating bridge damage using refined models demands significant time and ***,developing a rapid evaluation method for the seismic capacity of regular bridges has become a crucial scientific *** study presents an approach in which the ductile column is represented by a single degree-of-freedom model with elastic-plastic constitutive *** an uncoupled multivariate power function model and a plastic hinge model,a multidimensional power function model for section hierarchical curvature is ***,the seismic multistage damage constitutive model(SMSD-CM)of member hierarchy is deduced and calibrated through theoretical *** model efficiently derives the trilinear constitutive model of components by inputting several crucial *** SMSD-CM accurately simulates the hysteretic curve and displacement time-history under actual seismic conditions and aligns well with pushover analysis results from *** efficiency,ease of operation,and accuracy make the model suitable for rapid evaluation of the seismic capacity of regular bridges within the road traffic network.

关键词： moment-curvature analysis fragility analysis curvature ductility seismic multilevel damage trilinear model

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基于博弈理论数学模型的人才培养策略解析

成才之路 2020年第3期 88-89页

作者：舒译苇辽宁省沈阳市第四中学

经济和社会的高速发展使得人力资源竞争逐渐成为国际竞争的核心,特别是高素质人才的培养已经成为制约我国经济持续发展的关键。文章根据博弈论的基本概念和研究思路,用纳什非合作博弈理论数学模型解析人才培养策略。

关键词：博弈论数学模型人才培养非合作博弈理论

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)

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

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

A versatile humanoid robot platform for dexterous manipulation and human-robot collaboration

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CAAI Transactions on Intelligence Technology 2024年第2期9卷 526-540页

作者： Xin shu Fenglei Ni Xinyang Fan shuai Yang Changyuan Liu Baoxu Tu yiwei Liu Hong Liu State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbinChina

Humanoid robots have attracted much attention by virtue of their compatibility with human ***,biped humanoids with immense promise still cannot function steadily and reliably in real-world settings in the current ***,rationally combining a humanoid robot with different stable mobile platforms is a favoured solution for diverse ***,a new versatile humanoid robot platform,aiming to provide a generic solution that can be flexibly deployed in diverse scenarios,for example,indoors and fields is *** humanoid robot platform incorporates multimodal perception,and extensible interfaces on hardware and software,allowing it to be rapidly integrated with different mobile platforms and end-effectors,only through easyto-assemble ***,the platform has achieved impressive integration,lightness,dexterity,and strength in its class,with human-like size and rich perception,targeted to have human-intelligent manipulation skills for human-engineered ***,this article elaborates on the reasoning behind the design choices,and outlines each ***,the essential performance of the platform is successfully demonstrated in a set of experiments with precise and dexterous manipulation,and human–robot collaboration requirements.

关键词： intelligent robots robotics

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

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

Amorphous hybrid tungsten oxide–nickel hydroxide nanosheets used as a highly efficient electrocatalyst for hydrogen evolution reaction

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Nano Research 2024年第4期17卷 2499-2508页

作者： Chao Lyu Chenghai Dai yiwei Tan State Key Laboratory of Materials-Oriented Chemical Engineering School of Chemistry and Chemical EngineeringNanjing Tech UniversityNanjing 211816China

There are more challenges for alkaline hydrogen evolution reaction(HER)via simultaneously expediting the electron-coupled water dissociation process(Volmer step)and the following electrochemical H_(2) desorption(Heyrovsky step).Hybrid amorphous electrocatalysts are highly desirable for efficient hydrogen evolution from water-alkali electrolyzers due to the bifunctionality for the different elementary steps of HER and optimal interactions with water molecules and the reactive hydrogen intermediates(Had).Herein,the synthesis of amorphous hybrid ultrathin(tungsten oxide/nickel hydroxide)hydrate(a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O)nanosheets on nickel foam(NF)for efficient alkaline HER is *** structural and composition features of a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O are characterized in *** resulting a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O/NF electrocatalyst with the synergistic effect of both hybrid components for the HER elementary steps shows greatly improved the activity and durability for the HER with a low overpotential of-41 and-163 mV at-10 and-500 mA·cm^(-2),respectively,a Tafel slope as low as-72.9 mV·dec^(-1),and long-term stability of continuous electrolysis for at least 150 h accompanying by inappreciable overpotential change in 1 M *** the hybrid a-[WO_(3)/Ni(OH)_(2)]·0.2H_(2)O,Ni(OH)_(2) and WO_(3) moieties are separately responsible for accelerating dissociative adsorption of water and weakening Had adsorption strength,which is beneficial to the improvement of the alkaline HER activity.

关键词： amorphous nanomaterial bimetallic electrocatalyst tungsten oxide ultrathin nanosheet hydrogen evolution reaction