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Stability and stabilization of discrete T-S fuzzy time-delay system based on maximal overlapped-rules group

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Journal of Systems Engineering and Electronics 2016年第1期27卷 201-210页

作者： songtao zhang Xiaowei Zhao Jiantong zhang School of Management Harbin University of Commerce School of Economics and Management Tongji University Department of Logistics and Maritime Studies The Hong Kong Polytechnic University

The problems of stability and stabilization for the discrete Takagi-Sugeno（T-S） fuzzy time-delay system are investigated.By constructing a discrete piecewise Lyapunov-Krasovskii function（PLKF） in each maximal overlapped-rules group（MORG）,a new sufficient stability condition for the open-loop discrete T-S fuzzy time-delay system is proposed and proved.Then the systematic design of the fuzzy controller is investigated via the parallel distributed compensation control scheme,and a new stabilization condition for the closed-loop discrete T-S fuzzy time-delay system is proposed.The above two sufficient conditions only require finding common matrices in each MORG.Compared with the common Lyapunov-Krasovskii function（CLKF） approach and the fuzzy Lyapunov-Krasovskii function（FLKF） approach,these proposed sufficient conditions can not only overcome the defect of finding common matrices in the whole feasible region but also largely reduce the number of linear matrix inequalities to be solved.Finally,simulation examples show that the proposed PLKF approach is effective.

关键词： stability analysis maximal overlapped-rules group（MORG） Takagi-Sugeno（T-S）fuzzy model discrete time-delay system piecewise Lyapunov-Krasovskii function（PLKF）.

Preventive Control for Power System Transient Security Based on XGBoost and DCOPF with Consideration of Model Interpretability

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CSEE Journal of Power and Energy Systems 2021年第2期7卷 279-294页

作者： songtao zhang Dongxia zhang Ji Qiao Xinying Wang Zhijian zhang China Electric Power Research Institute Beijing 100192China State Grid Beijing Electric Power Dispatching and Control Center Beijing 100031China

This paper proposes a new approach for online power system transient security assessment(TSA)and preventive control based on XGBoost and DC optimal power flow(DCOPF).The novelty of this proposal is that it applies the XGBoost and data selection method based on the 1-norm distance in local feature importance evaluation which can provide a certain model interpretability.The method of SMOTE+ENN is adopted for data rebalancing.The contingency-oriented XGBoost model is trained with databases generated by time domain simulations to represent the transient security constraint in the DCOPF model,which has a relatively fast speed of calculation.The transient security constrained generation rescheduling is implemented with the differential evolution algorithm,which is utilized to optimize the rescheduled generation in the preventive control.Feasibility and effectiveness of the proposed approach are demonstrated on an IEEE 39-bus test system and a 500-bus operational model for South Carolina,USA.

关键词： DC optimal power flow(DCOPF) model interpretability preventive control transient security assessment(TSA) XGBoost

Study on the Application of Non-Plastering Technology of BM Lightweight Aggregate Interlocking Block

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Journal of Architectural Research and Development 2022年第6期6卷 59-63页

作者： songtao zhang Wenxiang Tan Anhui Water Resources Development Co. Ltd.Bengbu 233000Anhui ProvinceChina

Benchmark(BM)lightweight aggregate interlocking block has the characteristics of energy saving,no plastering,convenient construction,etc.,which can be used for internal infilled walls at all parts(240 mm thick block can also be used for external infilled walls).The U-shaped bricks are used in building ring beams,structural columns and lintel formwork.It eases the formwork construction process,saves energy consumption,shortens the construction period,and reduces the materials used,achieving the purpose of ensuring a high-quality building at minimum construction cost.Taking the practical project as an example,this paper studies the performance and characteristics of BM light aggregate interlocking block,and introduces the key construction technologies,aiming to provide relevant reference for the application of BM light aggregate interlocking block in practical projects.

关键词： BM lightweight aggregate Interlocking block No plastering Construction procedure

Activated graphene with tailored pore structure parameters for long cycle-life lithium-sulfur batteries

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Nano Research 2017年第12期10卷 4305-4317页

作者： Mingbo Zheng songtao zhang Shuangqiang Chen Zixia Lin Huan Pang Yan Yu School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 China CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China

Activated graphene （AG） with various specific surface areas, pore volumes, and average pore sizes is fabricated and applied as a matrix for sulfur. The impacts of the AG pore structure parameters and sulfur loadings on the electrochemical performance of lithium-sulfur batteries are systematically investigated. The results show that specific capacity, cycling performance, and Coulombic efficiency of the batteries are closely linked to the pore structure and sulfur loading. An AG3/S composite electrode with a high sulfur loading of 72 wt.% exhibited an excellent long-term cycling stability （50% capacity retention over 1,000 cycles） and extra-low capacity fade rate （0.05% per cycle）. In addition, when LiNO3 was used as an electrolyte additive, the AG3/S electrode exhibited a similar capacity retention and high Coulombic efficiency （-98%） over 1,000 cycles. The excellent electrochemical performance of the series of AG3/S electrodes is attributed to the mixed micro/mesoporous structure, high surface area, and good electrical conductivity of the AG matrices and the well-distributed sulfur within the micro/mesopores, which is beneficial for electrical and ionic transfer during cycling.

关键词： energy storage,lithium-sulfur batteries,nanoporous materials,activated graphene

Boosting Chemodynamic Therapy by the Synergistic Effect of Co‑Catalyze and Photothermal Effect Triggered by the Second Near‑Infrared Light

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Nano-Micro Letters 2020年第12期12卷 318-330页

作者： songtao zhang Longhai Jin Jianhua Liu Yang Liu Tianqi zhang Ying Zhao Na Yin Rui Niu Xiaoqing Li Dongzhi Xue Shuyan Song Yinghui Wang Hongjie zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry(CIAC)Chinese Academy of Sciences(CAS)Changchun 130022People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Department of Chemistry Tsinghua UniversityBeijing 100084People’s Republic of China Department of Radiology The Second Hospital of Jilin UniversityChangchun 130041People’s Republic of China

In spite of the tumor microenvironments responsive cancer therapy based on Fenton reaction(i.e.,chemodynamic therapy,CDT)has been attracted more attentions in recent years,the limited Fenton reaction efficiency is the important obstacle to further application in clinic.Herein,we synthesized novel FeO/MoS2 nanocomposites modified by bovine serum albumin(FeO/MoS2-BSA)with boosted Fenton reaction efficiency by the synergistic effect of co-catalyze and photothermal effect of MoS2 nanosheets triggered by the second near-infrared(NIR II)light.In the tumor microenvironments,the MoS2 nanosheets not only can accelerate the conversion of Fe3+ions to Fe2+ions by Mo4+ions on their surface to improve Fenton reaction efficiency,but also endow FeO/MoS2-BSA with good photothermal performances for photothermal-enhanced CDT and photothermal therapy(PTT).Consequently,benefiting from the synergetic-enhanced CDT/PTT,the tumors are eradicated completely in vivo.This work provides innovative synergistic strategy for constructing nanocomposites for highly efficient CDT.

关键词： Chemodynamic therapy Fenton reaction Co-catalysis Photothermal effect NIR II biowindows

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送风式压差预冷装置的结构设计及试验研究

包装工程 2024年第13期45卷 276-284页

作者：吴坚吴晓微张松涛张同锋浙江科技学院机械与能源工程学院杭州310023 浙江微松冷链有限公司杭州310023 浙江省食品物流装备技术研究重点实验室杭州310023

目的针对隧道式压差预冷装置中单位空间堆码的果蔬存储量低、预冷速度慢等问题,研发一种空间利用率高、预冷速度快的压差预冷装置。方法通过数字化仿真确定在冷链厢侧面安装2台静压箱和4台风机,结构上增加预冷时货物的堆码空间;采用送... 详细信息

目的针对隧道式压差预冷装置中单位空间堆码的果蔬存储量低、预冷速度慢等问题,研发一种空间利用率高、预冷速度快的压差预冷装置。方法通过数字化仿真确定在冷链厢侧面安装2台静压箱和4台风机,结构上增加预冷时货物的堆码空间;采用送风的方式预冷,增加隧道内的空气流速,减小隧道内的压强,加大果蔬周转箱两侧的压力差,使通过果蔬的风速增加,从而缩短预冷时间。结果研究结果表明,56筐大白菜的温度从22.63℃降至5℃,时间为138min,能耗为10.37kW·h;预冷均匀性在±2℃之内。结论送风式预冷相比传统抽吸式预冷方式时间缩短了21%,能耗降低了14%;采用变频送风方式能耗降低了4%。

关键词：压差预冷隧道式送风式

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Spatially-controlled porous nanoflake arrays derived from MOFs:An efficiently long-life oxygen electrode

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Nano Research 2019年第10期12卷 2528-2534页

作者： Hao Gong Tao Wang Hairong Xue Xueyi Lu Wei Xia Li Song songtao zhang Jianping HeRenzhi Ma College of Materials Science and Technology^Jiangsu Key Laboratory of Materials and Technology for Energy Conversion Nanjing University(rf Aeronautics and AstronauticsNanjing 210016China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NatnikiTsukubaIbaraki 305-0044Japan School of Chemistry and Chemical Engineering South China University of TechnologyWushan Road 381Guangzhou 510641China Testing Center Yangzhou UniversityYangzhou 225009China

The urge nt expectati on of the n ext-ge neratio n en ergy storage devices for electric vehicles has drive n researchers'atte ntion to the lithium-oxyge n(Li-O2)batteries due to the satisfied specific energy density.Herein,spatially-controlled CO3O4 nanoflake arrays with three-dimensional networked morphology are adopted as flexible and self-sta nding oxyge n cathodes in L1-O2 batteries.The spin el-phase CO3O4 nano flakes were con verted from two dimensi on metal-orga nic frameworks with abundant available cha nnels and large specific surface area.The open-structure nano flake arrays possess sufficie nt Li2O2/cathode contact interface,great bifunctional catalytic performa nee and adequate Li2O2 accommodation,leading to the enhanced electrochemical performance of the L1-O2 batteries.As expected,the binder-free porous CO3O4/CT cathode delivers a high capacity of 6,509 mAh·g^-1(200 mA·g^-1)and enhanced stability over 100 cycles(limited by 1,000 mAh·g^-1).In additi on,pouch-type Li-O2 batteries were successfully desig ned and cycled with CO3O4/CT cathode as oxyge n electrodes,dem on strating its potential application for flexible electronics and wearable energy storage devices.

关键词： two-dimension metal-organic frameworks mesoporous CO3O4 flexible oxygen electrode lithium-oxygen batteries

冻土地区矿井水来源的水化学及环境同位素分析

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安全与环境学报 2024年第6期24卷 2147-2156页

作者：霍丙杰李涛陈建平张勇靳京爵张松涛辽宁工程技术大学矿业学院辽宁阜新123000 内蒙古牙克石五九煤炭(集团)有限责任公司生产技术部内蒙古呼伦贝尔022150 新疆工程学院安全科学与工程学院乌鲁木齐830023

冻土层季节性冻融过程会对地下水的渗流量、渗流方向和速度产生重要影响,进而导致冻土地区具有独特的地下水运移理论和机制。为了研究五九煤田胜利煤矿冻土地区矿井涌水来源及补给特征,采用水化学分析及^(13)C、^(14)C、^(18)O、D 4种... 详细信息

冻土层季节性冻融过程会对地下水的渗流量、渗流方向和速度产生重要影响,进而导致冻土地区具有独特的地下水运移理论和机制。为了研究五九煤田胜利煤矿冻土地区矿井涌水来源及补给特征,采用水化学分析及^(13)C、^(14)C、^(18)O、D 4种环境同位素相结合的方法,分析矿井水的水化学特征及同位素分布特征,明确矿井涌水来源。通过对7组水样的试验研究发现:第四系水、第四系永冻层消融水、矿井水、基岩水均起源于大气降水,地表水、第四系水接受大气降水补给较快,基岩裂隙水、第四系永冻层消融水接受浅层第四系水的微量补给;采空区内黄铁矿氧化量较大,存在溶解少量瓦斯中CO_(2)的可能性,导致采空区积水中13C富集;矿井水中地表水和第四系水入渗量较小,表明第四系永冻层隔水性能良好。研究结果与实际情况相符,不仅为胜利矿水害防治提供依据,还为冻土地区类似矿井水源判别提供借鉴。

关键词：安全工程环境同位素水源识别第四系含水层冻土地区

Novel multifunctional theranostic nanoagents based on Ho^(3+) for CT/MRI dual-modality imaging-guided photothermal therapy

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Science China Chemistry 2021年第4期64卷 558-564页

作者： Dongzhi Xue Yang Liu Longhai Jin Yinghui Wang Fengzhi Cui Jianhua Liu Xiaoqing Li songtao zhang Ying Zhao Na Yin Rui Niu Daguang Wang Hongjie zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China Department of Radiology The Second Hospital of Jilin UniversityChangchun 130041China Department of Gastric and Colorectal Surgery The First Hospital of Jilin UniversityChangchun 130021China

Because of the intrinsic defects of traditional treatment of cancer,it is quite needed to construct novel theranostic nanoagents that can not only improve the accuracy of imaging diagnosis but also achieve highly efficient therapy of cancer.Herein,we fabricated polydopamine-functionalized ammonium holmium fluoride nanocomposites(AHF@PDA)for dual-modality bioimaging(magnetic resonance imaging(MRI)and computed tomography(CT))owing to the high X-ray attenuation feature and magnetic property of Ho^(3+).Moreover,PDA shell endows AHF@PDA with excellent photothermal conversion performances and robust biocompatibility,leading to good treatment effect in vitro and in vivo.All above positive results certify that AHF@PDA have good potential as theranostic agents for clinical application in the future.

关键词： theranostics holmium dual-modality imaging photothermal therapy