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计及故障信息和需求不确定的应急物资灾前预布局与灾后调度

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电力系统自动化 2024年第13期48卷 120-129页

作者：郄聃万海洋张桐菲孙晓光王志强刘文霞华北电力大学电气与电子工程学院北京市102206 国网吉林省电力有限公司长春供电公司吉林省长春市130021

为提高灾前、灾后电力抢修物资与抢修人员调度的协调性和鲁棒性,提出一种计及故障信息和物资需求双重不确定的灾前电力抢修物资预布局与灾后协同调度策略。首先,灾前针对灾情预测信息和电力抢修物资的双重不确定性,考虑决策者对风险的... 详细信息

为提高灾前、灾后电力抢修物资与抢修人员调度的协调性和鲁棒性,提出一种计及故障信息和物资需求双重不确定的灾前电力抢修物资预布局与灾后协同调度策略。首先,灾前针对灾情预测信息和电力抢修物资的双重不确定性,考虑决策者对风险的偏好程度,建立基于均值-条件风险价值(CVaR)的双层物资调配分布鲁棒优化(DRO)模型,上层以电力抢修物资配置成本最小为目标对物资中转点的选择及预置电力抢修物资的数量进行优化,下层基于均值-CVaR工具搜索最恶劣故障场景分布,并鲁棒优化(RO)故障场景下中转点到故障点的电力抢修物资分配策略,以求得故障损失成本;其次,灾后考虑物资和抢修人员调度的时序耦合约束,建立以停电损失最小为目标,中转点分配至各故障点物资的种类及数量和抢修人员的调度计划为决策变量的混合整数线性规划模型;最后,通过118节点实际配电网系统进行仿真分析,验证了所提方法的有效性。

关键词：配电网故障抢修电力抢修物资分布鲁棒优化(DRO) 均值-条件风险价值(CVaR)

Oxygen‑Coordinated Single Mn Sites for Efficient Electrocatalytic Nitrate Reduction to Ammonia

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Nano-Micro Letters 2024年第1期16卷 147-159页

作者： Shengbo zhang Yuankang Zha Yixing Ye Ke Li Yue Lin Lirong Zheng Guozhong Wang Yunxia zhang Huajie Yin tongfei Shi Haimin zhang Laboratory of Materials Physics Centre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Key Laboratory of Agricultural Sensors Ministry of AgricultureSchool of Information and ComputerAnhui Agricultural UniversityHefei 230026People’s Republic of China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026People’s Republic of China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of Sciences19B Yuquan RoadBeijing 100049People’s Republic of China

Electrocatalytic nitrate reduction reaction has attracted increasing attention due to its goal of low carbon emission and environmental ***,we report an efficient NitRR catalyst composed of single Mn sites with atomically dispersed oxygen(O)coordination on bacterial cellulose-converted graphitic carbon(Mn-O-C).Evidence of the atomically dispersed Mn-(O-C_(2))_(4)moieties embedding in the exposed basal plane of carbon surface is confirmed by X-ray absorption *** a result,the as-synthesized Mn-O-C catalyst exhibits superior NitRR activity with an NH_(3)yield rate(RNH_(3))of 1476.9±62.6μg h^(−1)cm^(−2)at−0.7 V(*** hydrogen electrode,RHE)and a faradaic efficiency(FE)of 89.0±3.8%at−0.5 V(***)under ambient ***,when evaluated with a practical flow cell,Mn-O-C shows a high RNH_(3)of 3706.7±552.0μg h^(−1)cm^(−2)at a current density of 100 mA cm−2,2.5 times of that in the H *** in situ FT-IR and Raman spectroscopic studies combined with theoretical calculations indicate that the Mn-(O-C_(2))_(4)sites not only effectively inhibit the competitive hydrogen evolution reaction,but also greatly promote the adsorption and activation of nitrate(NO_(3)^(−)),thus boosting both the FE and selectivity of NH_(3)over Mn-(O-C_(2))_(4)sites.

关键词： Atomically dispersed Oxygen coordination Nitrate reduction reaction In situ spectroscopic studies Hydrogen evolution reaction

Design and validation of real-time dynamic spectrum management in OFDM-based HNPLC systems

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High Technology Letters 2015年第4期21卷 379-387页

作者：刘雯静 Guo Jingbo Yan Yanxin zhang tongfei State Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua University ROHM Semiconductor(Shanghai) Co. Ltd.Design Center

Time-varying frequency selective attenuation and colored noises are unfavorable characteristics of power line communication(PLC) channels of the low voltage *** overcome these disadvantages,a novel real-time dynamic spectrum management(DSM) algorithm in orthogonal frequency division multiplexing(OFDM)-based high-speed narrow-band power line communication(HNPLC) systems is proposed,and the corresponding FPGA circuit is designed and *** of the proposed DSM is validated with a large amount of network experiments under practical PLC *** the noise in each narrow subcarrier is approximately Gaussian,the proposed DSM adopts the BER/SER expression formulized via the AWGN channel to provide a handy and universal strategy for power *** real-time requirement is guaranteed by choosing subcarriers in group and employing the same modulation scheme within each *** measures are suitable for any modulation scheme no matter the system criterion is to maximize data rate or minimize power/*** design and hardware implementation of the proposed DSM are given with some flexible and efficient *** DSM circuit is carried out with Xilinx *** and practical experiments validate that the proposed real-time DSM significantly improves system performance.

关键词： plc系统动态频谱管理验证实验算法设计 OFDM 实时电力线通信 AWGN信道

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橡胶工程高等实验课虚拟仿真教学势在必行

高分子材料科学与工程 2023年第6期39卷 154-159页

作者：张继川吴晓辉张同飞李瑞昀北京化工大学材料科学与工程学院先进弹性体材料研究中心北京100029 中国石油和化学工业联合会北京100029 教育部弹性体材料节能与资源化工程研究中心北京100029

《橡胶工程高等实验》是我国高校橡胶工程本科专业的必修课程,但目前《橡胶工程高等实验》存在诸如师资力量薄弱、教学设施不足、面临安全风险及实验环境不佳等问题,致使《橡胶工程高等实验》的教学效果大打折扣。而通过虚拟仿真教学则... 详细信息

《橡胶工程高等实验》是我国高校橡胶工程本科专业的必修课程,但目前《橡胶工程高等实验》存在诸如师资力量薄弱、教学设施不足、面临安全风险及实验环境不佳等问题,致使《橡胶工程高等实验》的教学效果大打折扣。而通过虚拟仿真教学则可以有效提高教学质量,学生首先通过网络视频被动听课以通晓实验原理,再主动结合《橡胶工程高等实验》仿真软件虚拟再现真实世界橡胶混炼实验过程和结果,可满足教学大纲对于橡胶工程本科教学的要求,进而达到橡胶工程专业本科生的培养目标。

关键词：橡胶工程高等实验虚拟仿真教学改革

Wei Gensheng Crane man in the clouds

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城市漫步（上海版、英文） 2014年第1期 52-67页

作者： tongfei zhang 不详

Winner of the silver award at the Shanghai International Photographic Art Exhibition,Wei Censheng isn't a professional photographer-he is a construction crane operator.

关键词： operator. inner Exhibition

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HATS ALL,FOLKS

城市漫步（上海版、英文） 2017年第1期 18-19页

作者： tongfei zhang 不详

GODIVA'S PHILIPPE DAUE LIFE IS LIKE A BOX OF CHOCOLATES...

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城市漫步（上海版、英文） 2014年第2期 76-77页

作者： tongfei zhang 不详

Fourth generation in a line of chefs who have served the Belgian royal family,when Philippe Daue got a call from Godiva to head up China's chocolate program,he didn't *** a portfolio of five-star hotel dessert departm... 详细信息

关键词： des hotel GOD

PACK AND GO Backpacks are BaCK

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城市漫步（上海版、英文） 2016年第9期 20-21页

作者： tongfei zhang 不详

September might mean the end of summer,but it's also time to plan for the October *** are the most important accessory for traveling,allowing you to store all your essentials in one *** yoifre looking for something ca... 详细信息

关键词： something looking store

THE THAT'S GUIDE TO:CHINESE NEW YEAR FOOD Symbolic dishes for a traditional New Year's gorging

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城市漫步（上海版、英文） 2015年第2期 68-69页

作者： tongfei zhang 不详

Well,well,well,it's time for Chinese New Year once *** but mystified by this most important of traditional Chinese holidays?We'll lead you through the top five festive Chinese dishes,their symbolic meanings and,most importantly,the best places to try them *** these snacks in hand,you can enjoy a happy,auspicious and prosperous New Year!

关键词： dis prosperous symbolic