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Functional Hyperbranched Polythioamides Synthesized from Catalyst-free Multicomponent Polymerization of Elemental Sulfur

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Chinese Journal of Chemistry 2022年第6期40卷 725-733页

作者： Shangrun liu fengting li Wenxia Cao Rongrong Hu Ben Zhong Tang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSouth China University of TechnologyGuangzhouGuangdong 510640China Shenzhen Institute of Molecular Aggregate Science and Engineering School of Science and EngineeringThe Chinese University of Hong KongShenzhen CityGuangdong 518172China AIE Institute GuangzhouGuangdong 510530China Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science&TechnologyClear Water BayKowloonHong KongChina

Hyperbranched polymers with unique topological structures,large number of branching sites and terminal groups have attracted much attention,and are expected to possess advanced functionalities compared with their linear polymer counterparts.The devel-opment of hyperbranched polymers is hence highly desired but challenging,especially for sulfur-containing polymers which are at-tractive metal absorbents,optical materials,dielectric materials,and self-healing materials.In this work,six hyperbranched polythi-oamides with various topological structures,well-defined repeating units,satisfying yields(up to 99%),and high molecular weights(up to 101400 g/mol)were successfully designed and synthesized from the catalyst-free multicomponent polymerization of ele-mental sulfur,aromatic alkynes and aliphatic amines,through different monomer combination strategies based on the designed three-or four-functional alkyne and amine monomers.The hyperbranched polythioamides possess unique luminescence property,and strong affinity toward Hg^(2+),which can be utilized in the fluorescence detection of Hg^(2+),as well as mercury removal from aque-ous solutions with high efficiency of 99.99%and low mercury residue of 0.1 ppb.Hyperbranched polythioamides with unique struc-tures may be developed to a group of fascinating materials and find their potential applications as metal absorbents and optoelec-tronic materials.

关键词： Hyperbranched polymer Polythioamide Polymerization Sulfur Mercury

Preparation and application of amino functionalized mesoporous nanofiber membrane via electrospinning for adsorption of Cr^(3+) from aqueous solution

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Journal of Environmental Sciences 2012年第4期24卷 610-616页

作者： Ahmed A.Taha Junlian Qiao fengting li Bingru Zhang College of Environmental Science and Engineering UNEP Tongji Institute of Environment for Sustainable DevelopmentState Key Laboratory of Pollution Control and Resource ReuseTongji University

Novel amino （-NH2） functionalized mesoporous polyvinyl pyrrolidone （PVP）/SiO2 composite nanofiber membranes were fabricated by a one-step electrospinning method using poly （vinyl alcohol） and tetraethyl orthosilicate （TEOS） mixed with cationic surfactant, cety｜trimethyl ammonium bromide （CTAB） as the structure directing agent. Ureidopropyltriethoxysilane was used for functionalization of the internal pore surfaces. The membranes were characterized by scanning electron microscopy （SEM）, high-resolution transmission electron microscopy （HRTEM） images, X-ray diffraction （XRD）, Fourier-transform infrared spectroscopy （FT-IR）, element analyzer and Nz adsorption-desorption isotherms, The nanofiber diameters, average pore diameters and surface areas were 100-700 nm, 2.86 nm and 873,62 m2/g, respectively. These mesoporous membranes functionalized with -NH2 groups exhibited very high adsorptions properties based on the adsorption of Cr3＋ from an aqueous solution. Equilibrium adsorption was achieved after approximately 20 rain and more than 97% of chronium ions in the solution were removed. The membrane could be regenerated through acidification.

关键词： mesoporous electrospinning nanofiber amino groups adsorption

面向新能源高渗透系统调峰和调频的系统级储能容量需求分析

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电力自动化设备 2024年第1期44卷 24-31页

作者：王森李凤婷张高航尹纯亚李源新疆大学电气工程学院新疆乌鲁木齐830047

高渗透新能源的强不确定性及火电机组占比的逐步减小使得系统灵活性资源不足,系统级储能可高效缓解系统的调峰和调频压力。为此,从系统角度提出了一种面向新能源高渗透系统调峰和调频的系统级储能需求容量确定方法。基于分位数回归分析... 详细信息

高渗透新能源的强不确定性及火电机组占比的逐步减小使得系统灵活性资源不足,系统级储能可高效缓解系统的调峰和调频压力。为此,从系统角度提出了一种面向新能源高渗透系统调峰和调频的系统级储能需求容量确定方法。基于分位数回归分析和高斯混合模型聚类,提出了一种刻画净负荷不确定性的场景集生成方法;基于生成的场景集,建立了一种无储能容量约束的常规火电机组与储能联合优化运行模型,以获取最优运行时储能参与调峰和调频的功率;为了同时兼顾储能利用率和系统运行成本,构建了基于储能电量偏离程度、运行成本增长率指标的储能功率修正模型,并确定储能需求功率和容量,进而分析新能源渗透率、储能功率和容量与满足需求的置信度水平三者之间的关系。算例仿真结果表明,所提方法能够有效确定新能源高渗透系统调峰和调频对储能的需求容量。

关键词：高渗透新能源储能系统分位数回归分析不确定场景集调峰调频联合优化

Problems of Syrdarya river basin management

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Frontiers of Environmental Science & Engineering 2009年第2期3卷 221-225页

作者： Serdar EYEBERENOV Baijing CAO fengting li UNEP-TONGJI Institute of Environment for Sustainable Development Tongji UniversityShanghai 200092China

Prior to independence,Central Asian countries were closely interconnected through the regional management incorporating water,energy,and food sectors.This approach,supported by the central government of Union of Soviet Socialist Republics(USSR),functioned effectively–meeting the needs of both upstream and downstream countries.However,after independence,Central Asian countries started prioritizing their own economic development policies without due account to regional concerns such as joint use of water resources,leading to instability.In this study,the case of Syrdarya basin was investigated to show how such strategies create tension in the region,since primary focus is given to national interests,without consideration for regional problems.To address this issue,an integrated approach to incorporating water,energy,and agriculture is needed.It is suggested that a single sector approach on water alone does not lead to stability,and a multi-sectoral approach is necessary to ensure sustainable development.Countries sharing benefits from the river have to be responsible for costs of operation and maintenance of the water facilities.

关键词： Central Asia energy agriculture water Syrdarya basin

基于新能源-负荷相似性的源荷储协调调峰优化调度

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电力自动化设备 2024年第3期44卷 15-21页

作者：王婷李凤婷周远翔崔巍新疆大学电气工程学院新疆乌鲁木齐830047 新疆农业大学机电工程学院新疆乌鲁木齐830052 清华大学电机系北京100084 国网宁夏电力有限公司超高压公司宁夏银川750000

合理利用可调节负荷的响应特性来实现源荷储的协调调度,可有效缓解新能源、负荷的不确定性所带来的调峰压力。基于新能源-负荷(NER-L)相似性,建立可调节负荷响应目标。基于相关系数,建立能准确刻画负荷对新能源出力跟踪匹配程度的NER-L... 详细信息

合理利用可调节负荷的响应特性来实现源荷储的协调调度,可有效缓解新能源、负荷的不确定性所带来的调峰压力。基于新能源-负荷(NER-L)相似性,建立可调节负荷响应目标。基于相关系数,建立能准确刻画负荷对新能源出力跟踪匹配程度的NER-L相似性指标,并将指标引入所建源荷储协调调峰的双阶段优化调度模型。第一阶段模型以NER-L相关系数最大为目标,确定可调节负荷在各时段的响应功率并获得最优电网负荷;第二阶段模型以弃风弃光量最小、调峰运行成本最低为目标,优化火电机组及储能出力。以IEEE 30节点系统为例,对NER-L相似性、净负荷峰谷差、系统调峰运行经济性及新能源弃电功率进行计算分析,结果验证了所提模型的有效性。

关键词：新能源可调节负荷储能相似性调峰协调调度

Selective electroreduction of nitrate to ammonia via NbWO_(6)perovskite nanosheets with oxygen vacancy

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Chinese Chemical Letters 2023年第5期34卷 385-388页

作者： Tao Feng fengting li Xiaojun Hu Ying Wang School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Electrocatalytic nitrate reduction to ammonia(NRA)under ambient conditions is significant for carbonneutral synthetic fuels.Nevertheless,the lack of efficient electrocatalysts with tunable nanostructure for NRA remains a grand challenge.Herein,Nb WO_(6)nanosheets with oxygen vacancy(NbWO_(6-x))was demonstrated via thermal treatment and exfoliation with NH_(3)selectivity of 86.8%and Faradaic efficiency of85.7%toward NRA.^(1)H nuclear magnetic resonance spectra coupled with^(15)N isotope labeling experiments proved that NH_(3)originated from NO_(3)^-.The function of oxygen vacancy was revealed by computational studies in NRA.Moreover,the reaction mechanism and pathway of NRA could be deduced based on the results of online differential electrochemical mass spectrometry(DEMS).This work provides a selective NH_(3)generation strategy to decarbonize the energy-chemical sector,bridging the gap between batteries and biofuels.

关键词： Nitrate reduction Ammonia generation NbWO_(6-x)nanosheets Oxygen vacancy Adsorption energy

基于全产业链的国家粮食安全产业带建设基础评价

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中国农业资源与区划 2024年第1期45卷 34-44页

作者：张艳陈怡冰李凤廷刘威河南工业大学管理学院郑州450001 河南高校人文社科重点研究基地物流研究中心郑州450001

[目的]通过对国家粮食安全产业带建设基础的客观评价,确定不同区域国家粮食安全产业带建设的比较优势和短板制约,为差异化区域发展路径提供依据和支撑。[方法]文章从全产业链的角度构建国家粮食安全产业带发展水平评价指标体系,并基于... 详细信息

[目的]通过对国家粮食安全产业带建设基础的客观评价,确定不同区域国家粮食安全产业带建设的比较优势和短板制约,为差异化区域发展路径提供依据和支撑。[方法]文章从全产业链的角度构建国家粮食安全产业带发展水平评价指标体系,并基于熵权法、全局莫兰指数和耦合协调度模型,对2020年东北、黄淮海和长江中下游平原国家粮食安全产业带产业链发展水平、空间相关性和协调度进行测度。[结果](1)由于其生产环节突出的比较优势,东北平原粮食安全产业带发展水平综合得分最高,黄淮海平原加工环节比较优势显著,长江中下游平原各环节都不具备比较优势,综合得分最低;(2)粮食生产和加工地理集聚特征显著,得分高的区域分布较为集中,而流通和服务支撑集聚特征不显著;(3)粮食产业链各环节间耦合协调度区域得分排名与综合发展水平一致,其中东北平原耦合协调度最高,且加工环节发展滞后于其他环节,黄淮海平原居中,流通体系建设相对滞后,而长江中下游平原最低,以濒临失调型为主。[结论]基于上述横向比较结果,按照“强化优势、补齐短板、重点突出、差异发展”的原则,认为东北平原、黄淮海平原和长江中下游平原应分别施行绿色优质生产引领、流通加工一体化和工贸带动的差异化发展路径。

关键词：国家粮食安全产业带全产业链发展水平评价空间相关协调

适用于带并抗的同杆双回线接地故障分相自适应重合闸策略

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电力系统保护与控制 2024年第5期52卷 12-24页

作者：蒋江波解超李凤婷尹纯亚张高航新疆大学电气工程学院新疆乌鲁木齐830017

同杆双回线发生接地故障采用传统跳闸策略时可能会产生负序分量,传统自动重合闸方案在合闸前不判定故障性质,重合失败时将影响系统稳定性。针对该问题,提出了一种适用于带并抗的同杆双回线接地故障改进跳闸与分相自适应重合闸策略。首先... 详细信息

同杆双回线发生接地故障采用传统跳闸策略时可能会产生负序分量,传统自动重合闸方案在合闸前不判定故障性质,重合失败时将影响系统稳定性。针对该问题,提出了一种适用于带并抗的同杆双回线接地故障改进跳闸与分相自适应重合闸策略。首先,通过建立带并抗的同杆双回线各相之间的耦合模型并对其进行分析,提出了一种能够避免负序分量注入系统的改进跳闸策略。其次,分别对瞬时性故障和永久性故障情况下的故障相并联电抗器电流特征分析,提出了基于故障相并联电抗器微分栅电流的故障性质判据。最后,结合改进跳闸策略和故障性质判据,形成了适用于带并抗的同杆双回线接地故障分相自适应重合闸策略。PSCAD/EMTDC仿真验证了所提改进跳闸与分相自适应重合闸策略能够避免负序分量注入系统,以及在不同接地故障类型、故障位置和过渡电阻情况下都能保证输电线路重合成功率。

关键词：自适应重合闸微分栅故障性质判据瞬时性故障永久性故障

适用于同杆双回线路接地故障改进跳闸与分相自适应重合闸策略

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电力科学与技术学报 2024年第3期39卷 48-57页

作者：蒋江波解超李凤婷尹纯亚新疆大学电气工程学院新疆乌鲁木齐830046

同杆双回线路发生接地故障时采用传统跳闸策略可能会产生负序分量,传统自动重合闸方案在合闸前不判定故障性质,重合失败时将影响系统稳定性。针对该问题,提出一种适用于同杆双回线路接地故障改进跳闸与分相自适应重合闸策略。首先,建立... 详细信息

同杆双回线路发生接地故障时采用传统跳闸策略可能会产生负序分量,传统自动重合闸方案在合闸前不判定故障性质,重合失败时将影响系统稳定性。针对该问题,提出一种适用于同杆双回线路接地故障改进跳闸与分相自适应重合闸策略。首先,建立同杆双回输电线路各相之间的耦合模型并对其进行分析,提出一种能够避免负序分量注入系统的改进跳闸策略;其次,分别对瞬时性故障情况下和永久性故障情况下电容耦合电压特性进行分析,提出基于故障相电容耦合电压的故障性质判据;最后,结合改进跳闸策略和合闸策略,形成了适用于同杆双回输电线路接地故障分相自适应重合闸策略。通过PSCAD/EMTDC仿真验证了所提分相自适应重合闸策略能够避免负序分量注入系统,以及在不同接地故障类型、故障位置和过渡电阻情况下都能保证输电线路的重合成功率。

关键词：自适应重合闸分相开关故障性质判据瞬时性故障永久性故障