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Deformation coordination analysis of CC-RCC combined dam structures under dynamic loads

Water Science and Engineering 2020年第2期13卷 162-170页

作者： Bo-wen Shi Ming-chao Li Ling-guang Song meng-xi zhang Yang Shen State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China Department of Construction Management University of HoustonHoustonTX 77204USA

A combined dam structure using different concrete materials offers many practical *** are several real-world cases where largevolume heterogeneous concrete materials have been used *** the engineering design standpoint,it is crucial to understand the deformation coordination characteristics and mechanical properties of large-volume heterogeneous concrete,which affect dam safety and *** this study,a large dam facility was selected for a case study,and various design schemes of the combined dam structure were developed by changing the configurations of material zoning and material types for a given dam *** analysis of the damfoundation-reservoir system for six schemes was carried out under dynamic conditions,in which the concrete damaged plasticity(CDP)model,the Lagrangian finite element formulation,and a surface-to-surface contact model were *** evaluate the mechanical properties of zoning interfaces and coordination characteristics,the vertical distribution of the first principal stress at the longitudinal joint was used as the critical index of deformation coordination control,and the overall deformation and damage characteristics of the dam were also *** a comparative study of the design schemes,an optimal scheme of the combined dam structure was identified:large-volume roller-compacted concrete(RCC)is recommended for the dam body upstream of the longitudinal joint,and high-volume fly ash conventional concrete(CC)for the dam body downstream of the longitudinal *** study provides engineers with a reference basis for combined dam structure design.

关键词： Combined dam structure Deformation coordination CC-RCC Dynamic response Finite element simulation Concrete damaged plasticity(CDP)model

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Heavy metal pollution and potential ecological risk in reclaimed soils in Huainan mining area

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Journal of Coal Science & Engineering(China) 2010年第3期16卷 316-319页

作者： YAO Duo-xi meng Jun zhang Zhi-guo School of Earth and Environment Anhui University of Science and Technology Huainan 232001 China

In order to determine the environmental quality condition of reclaimed soils inHuainan mining area, soil samples were collected from three representative mines, suchas Panyi Mine, xinzhuangzi Mine and Datong *** total concentration of Cd, Hg, Cu,Pb and As in the samples were *** potential ecological risk was used to evaluatethe heavy metals *** investigation reveals that the reclaimed soils are contaminatedto a certain degree and the trace elements in coal gangue transferred to thesurface *** order of potential ecological risk is Cd>Hg>Cu>Pb>As; the pollution degreeof each sampling site is arranged in the following order: xinzhuangzi Mine>DatongMine>Panyi Mine, and the multiform of heavy metals of potential ecological risk index is at357.35～484.62.

关键词： heavy metal pollution potential ecological risk reclaimed soils

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Extraction and isolation of the salidroside-type metabolite from zinc(Zn) and cadmium(Cd) hyperaccumulator Sedum alfredii Hance

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第10期13卷 839-845页

作者： Yan xiNG Hong-yun PENG xia LI meng-xi zhang Ling-ling GAO xiao-e YANG Ministry of Education Key Laboratory of Environmental Remedia-tion and Ecological Health College of Environmental and ResourceSciencesZhejiang UniversityHangzhou 310058China State Key Laboratory of Hydrology-Water Resources and HydraulicEngineering Hohai UniversityNanjing 210098China

The active metabolite in the post-harvested biomass of zinc(Zn) and cadmium(Cd) hyperaccumulator Sedum alfredii Hance from phytoextraction is of great interest in *** current study demonstrates that a salidroside-type metabolite can be yielded from the Zn/Cd hyperaccumulator *** biomass by means of sonication/ethanol extraction and macroporous resin column(AB-8 type) *** concentrations of Zn and Cd in the salidroside-type metabolite were below the limitation of the national standards.

关键词： Salidroside-type metabolite Isolation Hyperaccumulator Sedum alfredii Hance

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Caffeic acid product from the highly copper-tolerant plant Elsholtzia splendens post-phytoremediation:its extraction,purification,and identification

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第6期13卷 487-493页

作者： Yan xiNG Hong-yun PENG meng-xi zhang xia LI Wei-wei ZENG xiao-e YANG Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China

In the current study,caffeic acid was an important metabolite in the highly copper-tolerant plant Elsholtzia *** and purification of caffeic acid were performed on the dried biomass of the plants by means of sonication/ethanol extraction,followed by purification using a macroporous resin (D101 type) column and silica gel *** faint-yellow caffeic acid product was yielded with a purity of 98.46%,and it was chemically identified from spectra of Fourier transform infrared spectroscopy (FTIR),proton nuclear magnetic resonance (1 H NMR)/carbon nuclear magnetic resonance (13 C NMR),and electrospray ionization mass spectrometry (ESI-MS).Caffeic acid is a possible product from the post-harvest processing of Elsholtzia splendens biomass.

关键词： Caffeic acid Purification Post-processing Copper tolerance Elsholtzia splendens

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深厚覆盖层潜蚀对大坝应力变形影响的有限元模拟

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岩土力学 2017年第7期38卷 2087-2095页

作者：吴梦喜余挺张琦中国科学院力学研究所北京100190 中国科学院大学北京100049 中国电建集团成都水利水电勘测设计研究院四川成都610072

深厚覆盖层坝基潜蚀不一定导致坝基的渗透破坏。但坝基砂砾石土内部细颗粒的流失,一方面会增大土体的渗透性;另一方面可降低土体的强度和变形模量。前者导致坝基坝体渗流场的变化,从而引起坝体变形和应力变化,后者变形模量衰化,导致坝... 详细信息

深厚覆盖层坝基潜蚀不一定导致坝基的渗透破坏。但坝基砂砾石土内部细颗粒的流失,一方面会增大土体的渗透性;另一方面可降低土体的强度和变形模量。前者导致坝基坝体渗流场的变化,从而引起坝体变形和应力变化,后者变形模量衰化,导致坝基坝体变形和应力调整。潜蚀造成的坝基和坝体应力变形对大坝的正常使用和安全性带来一定负面影响,定量评估这种影响是内部不稳定砂砾石深厚覆盖层坝基采用悬挂式防渗墙处理方案设计和该类大坝运行管理的迫切需求。提出了潜蚀对大坝应力变形影响的模拟方法,对一个典型大坝设计方案进行了计算分析,该设计方案中潜蚀造成应力变形变化的两种机制中,渗流场变化机制对坝基坝体的应力变形改变远大于模量衰化造成的影响。总体上该方案潜蚀造成的坝体变形和应力变化并未显著降低坝体的安全性。

关键词：管涌潜蚀有限元砂砾石应力变形

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Joint Probabilistic Scheduling and Resource Allocation for Wireless Networked Control Systems

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 258-260页

作者： meng Zheng Lei zhang Wei Liang IEEE the State Key Laboratory of Robotics and the Key Laboratory of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences the University of Chinese Academy of Sciences

Dear Editor,This letter presents a joint probabilistic scheduling and resource allocation method(PSRA) for 5G-based wireless networked control systems(WNCSs). As a control-aware optimization method, PSRA minimizes the linear quadratic Gaussian(LQG) control cost of WNCSs by optimizing the activation probability of subsystems, the number of uplink repetitions, and the durations of uplink and downlink phases. Simulation results show that PSRA achieves smaller LQG control costs than existing works.

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Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen Chao Wu xiaoling Liu Biao meng Tao Chen Yu Han Jun Wang Shibo xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect Carbon catalyst Electrocatalysis

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Smart Cellulose‑Based Janus Fabrics with Switchable Liquid Transportation for Personal Moisture and Thermal Management

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Nano-Micro Letters 2025年第1期17卷 333-347页

作者： Jianfeng xi Yanling Lou Liucheng meng Chao Deng Youlu Chu Zhaoyang Xu Huining xiao Weibing Wu Jiangsu Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsJiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass MaterialsNanjing Forestry UniversityNanjing 210037People’s Republic of China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China Department of Chemical Engineering University of New BrunswickFrederictonNB E3B 5A3Canada Macromolecular Chemistry and Bavarian Polymer Institute University of BayreuthBayreuth 95440Germany

The Janus fabrics designed for personal moisture/thermal regulation have garnered significant attention for their potential to enhance human ***,the development of smart and dynamic fabrics capable of managing personal moisture/thermal comfort in response to changing external environments remains a ***,a smart cellulose-based Janus fabric was designed to dynamically manage personal moisture/*** cotton fabric was grafted with N-isopropylacrylamide to construct a temperature-stimulated transport ***,hydrophobic ethyl cellulose and hydrophilic cellulose nanofiber were sprayed on the bottom and top sides of the fabric to obtain wettability *** fabric exhibits anti-gravity directional liquid transportation from hydrophobic side to hydrophilic side,and can dynamically and continuously control the transportation time in a wide range of 3–66 s as the temperature increases from 10 to 40℃.This smart fabric can quickly dissipate heat at high temperatures,while at low temperatures,it can slow down the heat dissipation rate and prevent the human from becoming too *** addition,the fabric has UV shielding and photodynamic antibacterial properties through depositing graphitic carbon nitride nanosheets on the hydrophilic *** smart fabric offers an innovative approach to maximizing personal comfort in environments with significant temperature variations.

关键词： Directional water transport Cotton fabric Anti-gravity directional liquid transportation Janus wettability

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High-resolution imaging through dynamic scattering media: Iterative optimization based on polarimetric characteristics

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Science China Technological Sciences 2025年第1期 82-84页

作者： meng xiANG Kai DENG Tianyu WANG Jinpeng LIU Xue DONG Teli xi Fei LIU xiaopeng SHAO School of Optoelectronic Engineering Xidian University xi'an Key Laboratory of Computational Imaging National Key Laboratory of Infrared Detection Technologies

High-resolution imaging through randomly dynamic scattered fields and highly scattered walls is an extensively sought-after capability with potential applications in various fields such as underwater imaging, biomedical imaging, and seeing through fog. Numerous methods have been proposed to unscramble object information from degraded scattered images, resulting in considerable improvements in image contrast in degraded scenarios [1].

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利用瞬态荧光技术研究单重态激子裂变的电荷转移模型

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西南大学学报（自然科学版） 2017年第7期39卷 161-167页

作者：田晓语周亮陈茜孟妍张勇西南大学物理科学与技术学院重庆400715

有机材料中单重态激子的裂变过程,由于其在有机光伏器件中的潜在应用而成为一个科学研究的热点.传统的观点采用电荷转移模型来解释激子裂变过程,即认为2个参与裂变的分子之间通过两次的电荷转移来实现分子状态的改变.而在电荷转移的物... 详细信息

有机材料中单重态激子的裂变过程,由于其在有机光伏器件中的潜在应用而成为一个科学研究的热点.传统的观点采用电荷转移模型来解释激子裂变过程,即认为2个参与裂变的分子之间通过两次的电荷转移来实现分子状态的改变.而在电荷转移的物理图像中,又包括双空穴转移方式和双电子转移方式两种可能性.为了检验电荷转移模型的合理性,将能够发生激子裂变过程的红荧烯分子分别混合于其他4种有机分子中,这4种有机分子被当作间隔分子,用来分离混合膜中掺杂的红荧烯分子.对红荧烯分子与间隔分子,二者间HOMO能级的能量差构成空穴转移的隧穿势垒,而二者间LUMO能级的能量差构成电子转移的隧穿势垒.对4个样品发光衰减曲线的测量与分析表明,激子裂变的速率与电子隧穿势垒的高度具有明显的关联,这从实验角度首次印证了双电子转移模型而否定了双空穴转移模型.

关键词：红荧烯激子裂变瞬态荧光电荷转移

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