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工程量清单计价模式下工程结算单价调值公式的分析研究

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建设监理 2024年第2期 56-58,70页

作者：齐国舟洪海峰浙江浙坤工程管理有限公司浙江杭州310004

研究工程量清单计价模式下工程竣工结算单价的计价,不包括工程总承包总价合同结算单价及采用工料单价法的定额计价。通过分析发承包方工程量清单计价的区别及目前工程结算综合单价发生调价的三种基本形式,并比较采用报价浮动率确定新的... 详细信息

研究工程量清单计价模式下工程竣工结算单价的计价,不包括工程总承包总价合同结算单价及采用工料单价法的定额计价。通过分析发承包方工程量清单计价的区别及目前工程结算综合单价发生调价的三种基本形式,并比较采用报价浮动率确定新的综合单价与采用投标报价综合单价本质的区别,提出工程结算在工程变更、工程量偏差、极端不平衡报价三个方面综合单价调值公式的修正建议。

关键词：工程量清单综合单价结算计价调整

Directed graph-based distribution network reconfiguration for operation mode adjustment and service restoration considering distributed generation

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Journal of Modern Power Systems and Clean Energy 2017年第1期5卷 142-149页

作者： haifeng hong Zhesheng HU Ruipeng GUO Jun MA Jiong TIAN College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Ningxia Electric Power Company State Grid Corporation of ChinaYinchuan 750001China

We present a directed graph-based method for distribution network reconfiguration considering distributed generation. Two reconfiguration situations are considered: operation mode adjustment with the objective of minimizing active power loss(situation Ⅰ) and service restoration with the objective of maximizing loads restored(situation Ⅱ). These two situations are modeled as a mixed integer quadratic programming problem and a mixed integer linear programming problem, respectively. The properties of the distribution network with distributed generation considered are reflected as the structure model and the constraints described by directed graph. More specifically, the concepts of "in-degree" and "out-degree"are presented to ensure the radial structure of the distribution network, and the concepts of "virtual node" and"virtual demand" are developed to ensure the connectivity of charged nodes in every independent power supply *** validity and effectiveness of the proposed method are verified by test results of an IEEE 33-bus system and a 5-feeder system.

关键词： Distribution network Distributed generation Network reconfiguration Directed graph Operation mode adjustment Service restoration

太湖流域水利安全生产风险管控“六项机制”建设探索与展望

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中国水利 2024年第2期 52-55页

作者：张程谢凯胡书庭孙嘉良洪海峰水利部太湖流域管理局上海200434 水利部太湖流域管理局苏州管理局苏州215000

太湖流域管理局苏州管理局于2023年启动“六项机制”试点建设,以安全生产基础工作为依托,融合数字孪生平台建设,探索形成可复制、可推广的经验做法。在对“六项机制”建设定位进行深入思考的基础上,梳理了“六项机制”试点建设实施基本... 详细信息

太湖流域管理局苏州管理局于2023年启动“六项机制”试点建设,以安全生产基础工作为依托,融合数字孪生平台建设,探索形成可复制、可推广的经验做法。在对“六项机制”建设定位进行深入思考的基础上,梳理了“六项机制”试点建设实施基本情况,以及强化风险“查找”能力、延伸风险“研判”机制、提升风险“预警”时效、指导风险“防范”重点、提高风险“处置”水平、精确风险“责任”匹配等创新内容。总结了构建“四横三纵”分层管理架构,增加风险管控责任层级,以及理顺机制脉络,将“板块化”+“链条化”理念贯穿于安全生产风险管控全过程等经验做法。提出了将“六项机制”建设融入安全生产管理基础工作、与“数字孪生”建设同步推进等建议思考。

关键词：安全生产风险管控六项机制数字孪生

Thermal safety boundary of lithium-ion battery at different state of charge

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Journal of Energy Chemistry 2024年第4期91卷 59-72页

作者： Hang Wu Siqi Chen Yan hong Chengshan Xu Yuejiu Zheng Changyong Jin Kaixin Chen Yafei He Xuning Feng Xuezhe Wei haifeng Dai Clean Energy Automotive Engineering Center Tongji UniversityShanghai 201804China College of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China

Thermal runaway(TR)is a critical issue hindering the large-scale application of lithium-ion batteries(LIBs).Understanding the thermal safety behavior of LIBs at the cell and module level under different state of charges(SOCs)has significant implications for reinforcing the thermal safety design of the lithium-ion battery *** study first investigates the thermal safety boundary(TSB)correspondence at the cells and modules level under the guidance of a newly proposed concept,safe electric quantity boundary(SEQB).A reasonable thermal runaway propagation(TRP)judgment indicator,peak heat transfer power(PHTP),is proposed to predict whether TRP ***,a validated 3D model is used to quantitatively clarify the TSB at different SOCs from the perspective of PHTP,TR trigger temperature,SOC,and the full cycle ***,three different TRP transfer modes are *** interconversion relationship of three different TRP modes is investigated from the perspective of *** paper explores the TSB of LIBs under different SOCs at both cell and module levels for the first time,which has great significance in guiding the thermal safety design of battery systems.

关键词： Lithium-ion battery Battery safety Thermal runaway State of charge Numerical analysis

Dual metal ions/BNQDs boost PMS activation over copper tungstate photocatalyst for antibiotic removal:Intermediate,toxicity assessment and mechanism

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Journal of Materials Science & Technology 2024年第3期170卷 11-24页

作者： Ruyao Chen Haiyue Zhang Yuming Dong haifeng Shi School of Science Jiangnan UniversityWuxi214122China The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationJiangnan UniversityWuxi214122China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing210093China

In the metal-based peroxymonosulfate(PMS)activation process,the sluggish surface redox cycle of metal ions generally hampered the efficiency of PMS activation for pollutant ***,Codoped CuWO 4/BN quantum dots(CW/Co/BNQDs)photocatalysts were developed to realize Cu^(2+)/Cu+and Co^(2+)/Co^(3+)dual ions redox cycles for PMS activation,which would facilitate the tetracycline(TC)***/4Co/2BNQDs could degrade 94.8%TC within 30 min in PMS/Vis system,and the apparent rate constant of CW/4Co/2BNQDs was 2.7 times and 1.2 times higher than those of CW and CW/4Co,*** improved TC degradation performance could be attributed to the synergetic effect between BNQDs and dual redox cycles.X-ray photoelectron spectroscopy(XPS)spectra of samples before and after the reaction demonstrated that BNQDs were beneficial for accelerating the Cu^(2+)/Cu+and Co^(2+)/Co^(3+)redox cycles in CW/4Co/2BNQDs,further boosting the activation of PMS in TC *** of different radical scavengers revealed that the SO_(4)^(·−)/·OH/h+/^(1)O_(2)reactive species participated in the PMS activation for the TC degradation *** possible TC degradation pathway and intermediate toxicity were detailed *** addition,CW/4Co/2BNQDs exhibited outstanding photocatalytic activity over five consecutive cycles,which illustrated that it was supposed to be a reliable PMS activator over antibiotic elimination for practical *** this work shed new light on constructing dual redox cycles for efficient PMS activation.

关键词： Dual redox cycles Photocatalysis Peroxymonosulfate BN quantum dots Toxicity assessment

Asymmetric Hydrogenation of Phenanthridines with Chiral Boranes

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Chinese Journal of Chemistry 2024年第6期42卷 631-635页

作者： Guangyu Cui Xiangqing Feng haifeng Du Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Molecular Recognition and FunctionInstitute of ChemistryChinese Academy of SciencesBeijing100190 China University of Chinese Academy of Sciences Beijing100049 China

The asymmetric hydrogenation of N-heteroarenes provides an efficient method for the synthesis of optically active cyclic secondary *** this paper,we described an asymmetric hydrogenation of phenanthridines using a chiral mono-alkene-derived borane.A variety of dihydrophenanthridines were furnished in high yields with up to 93%*** current catalytic system was very sensitive for the steric hindrance of *** substituents at one phenyl group of phenanthridines were required to obtain the high *** large substituents on the carbon of the C=N bonds would diminish the reactivity sharply.

关键词： Asymmetric catalysis Hydrogenation Nitrogen heterocycles Phenanthridines Frustrated Lewis pairs Chiral boranes

Reducing idleness in financial cloud services via multi-objective evolutionary reinforcement learning based load balancer

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Science China(Information Sciences) 2024年第2期67卷 20-40页

作者： Peng YANG Laoming ZHANG haifeng LIU Guiying LI Department of Statistics and Data Science Southern University of Science and Technology Guangdong Provincial Key Laboratory of Brain-Inspired Intelligent Computation Department of Computer Science and EngineeringSouthern University of Science and Technology Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Guangdong OPPO Mobile Telecommunications Corp. Ltd Research Institute of Trustworthy Autonomous Systems Southern University of Science and Technology

In recent years, various companies have started to shift their data services from traditional data centers to the cloud. One of the major motivations is to save on operational costs with the aid of cloud elasticity. This paper discusses an emerging need from financial services to reduce the incidence of idle servers retaining very few user connections, without disconnecting them from the server side. This paper considers this need as a bi-objective online load balancing problem. A neural network based scalable policy is designed to route user requests to varied numbers of servers for the required elasticity. An evolutionary multi-objective training framework is proposed to optimize the weights of the policy. Not only is the new objective of idleness reduced by over 130% more than traditional industrial solutions, but the original load balancing objective itself is also slightly improved. Extensive simulations with both synthetic and real-world data help reveal the detailed applicability of the proposed method to the emergent problem of reducing idleness in financial services.

关键词： evolutionary reinforcement learning evolutionary multi-objective optimization load balance cloud computing

Asymmetric Partial Hydrosilylation of 2,2-Difluoro-1,3-diketones with Chiral Frustrated Lewis Pairs

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Chinese Journal of Chemistry 2024年第8期42卷 853-857页

作者： Ting Liu Xiangqing Feng haifeng Du Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Molecular Recognition and FunctionInstitute of ChemistryChinese Academy of SciencesBeijing100190 China University of Chinese Academy of Sciences Beijing100049 China

Comprehensive Summary,The asymmetric partial reduction of 1,3-diketones stands as a straightforward pathway to access optically active β-hydroxyketones. In this paper, an asymmetric Piers-type hydrosilylation of 2,2-difluoro-1,3-diketones was successfully realized by using a frustrated Lewis pair of chiral borane and tricyclohexylphosphine as a catalyst, delivering a variety of α,α-difluoro-β-hydroxyketones in high yields with up to 99% ee. Significantly, no over-reduced diol products were observed even with an excess amount of silanes. The product can be conveniently converted to α,α-difluoro-β-hydroxyester or 1,3-anti-diol via an oxidation with m-CPBA or a reduction with DIBAL-H without obvious loss of ee.

关键词： Asymmetric catalysis Hydrosilylation Ketones Frustrated Lewis pairs Chiral boranes

Multi-level intelligence empowering lithium-ion batteries

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Journal of Energy Chemistry 2024年第10期97卷 535-552,I0011页

作者： Guangxu Zhang Jiangong Zhu haifeng Dai Xuezhe Wei School of Materials Science and Engineering Tongji UniversityShanghai 201804China School of Automotive Studies Tongji UniversityShanghai 201804China

With the significant and widespread application of lithium-ion batteries,there is a growing demand for improved performances of lithium-ion *** intricate degradation throughout the whole lifecycle profoundly impacts the safety,durability,and reliability of lithium-ion *** ensure the long-term,safe,and efficient operation of lithium-ion batteries in various fields,there is a pressing need for enhanced battery intelligence that can withstand extreme *** work reviews the current status of intelligent battery technology from three perspectives:intelligent response,intelligent sensing,and intelligent *** intelligent response of battery materials forms the foundation for battery stability,the intelligent sensing of multi-dimensional signals is essential for battery management,and the intelligent management ensures the long-term stable operation of lithium-ion *** critical challenges encountered in the development of intelligent battery technology from each perspective are thoroughly analyzed,and potential solutions are proposed,aiming to facilitate the rapid development of intelligent battery technologies.

关键词： Battery intelligence Intelligent response Intelligent sensing Intelligent management