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Traceability technology of DC Electric Energy Metering for On-Site Inspection of Chargers

Energy Engineering 2023年第3期120卷 715-727页

作者： Hua Li Dezhi Xiong Zhi Wang Hunan Institute of Metrology and Inspection Changsha410018China State Grid Hunan Electric Power Corporation Limited Changsha410001China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha410001China

The on-site inspection of high-power DC chargers results in new DC high-current measurement and DC energy traceability system *** paper studies the traceability technology of electric energy value for automotive high-power DC chargers,including:(1)the traceability method of the built-in DC energy meter and shunt of the charger;(2)precision DC high current and small precision DC voltage output and measurement *** paper designs a 0.1 mA∼600 A DC high current measurement system and proposes a 0.005 level DC powermeasurement traceability *** uncertainty evaluation experiment of theDC powermeasurement calibration system and the high-power DC charger’s on-site calibration experiment results verify the method’s effectiveness and feasibility in this *** experimental results show that the combined standard uncertainty of the DC power metering verification system can be 0.0451%.

关键词： DC electric energy measurement charger traceability calibration

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A Method and System for Evaluating Health Status of Low-voltage Power Supply Lines Based on Clustering Algorithm 4

A Method and System for Evaluating Health Status of Low-volt...

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4th International Conference on Information Technologies and Electrical Engineering, ICITEE 2021

作者： Yu, Minqi Huang, Rui Liu, Qin Zeng, Wenwei Yang, Maotao Grid Hunan Electric Power Corporation Limited China Hunan Province Key Laboratory Of Intelligent Electrical Measurement And Application Technology China

ISBN: (纸本)9781450386494

In order to solve the problems of complex evaluation process and slow processing speed of existing low-voltage power supply line health evaluation methods, an evaluation method of low-voltage power supply lines health status based on Fuzzy C-Mean (FCM) clustering algorithm and Euclidean distance is proposed. First, the voltage and current values before and after the voltage and current changes are collected according to the equivalent circuit diagram of the low-voltage power supply lines, the loop impedance is obtained by the voltage and current values before and after the change. Then the loop impedance of a single user is clustered using the FCM clustering algorithm to find out the data that may have abnormal health conditions. Finally, based on the Euclidean distance, the above-mentioned data that may have abnormal health conditions are analyzed again to further determine whether the line is abnormal. The results of the case analysis show that this method has the advantages of accurate impedance data measurement, less workload, and ensuring normal power supply for users. © 2021 ACM.

关键词： Clustering algorithms

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A Comprehensive Analysis Method for Optimal Configuration of Smart Meter Data Collector Based on PSO-BP Algorithm 4

A Comprehensive Analysis Method for Optimal Configuration of...

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4th International Conference on Information Technologies and Electrical Engineering, ICITEE 2021

作者： Yu, Minqi Shen, Liman Yang, Maotao Xie, Linjin He, Xing Wei, Shumin Grid Hunan Electric Power Corporation Limited China Hunan Province Key Laboratory Of Intelligent Electrical Measurement And Application Technology China

ISBN: (纸本)9781450386494

Aiming at the current electric power industry's problems related to the unreasonable configuration of smart meter data collectors and the smart meter measurement technology, this paper proposes a comprehensive analysis method for the optimal configuration of smart meter data collectors based on the PSO-BP neural network prediction model. Through the analysis of historical data in the station area, PSO is used to optimize the index. The database is established to import the BP neural network algorithm and training, and then the prediction of the station area to be configured with the data collector is completed. The experimental case proves that the above steps can reasonably configure the collector in the station area and optimize the data collection of the smart meter. While realizing convenient and effective data transmission, it also guarantees a certain degree of economy. © 2021 ACM.

关键词： Particle swarm optimization (PSO)

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Ultrathin organic polymer with p-πconjugated structure for simultaneous photocatalytic disulfide bond generation and CO_(2)reduction

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Journal of Energy Chemistry 2023年第1期76卷 639-647,I0016页

作者： Linquan Hou Zhunyun Tang Guojiang Mao Shiheng Yin Bei Long Tao Ouyang Guo-Jun Deng Atif Ali Ting Song Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtan 411105HunanChina Hunan Key Laboratory for Micro-Nano Energy Materials and Device School of Physics and OptoelectronicsXiangtan UniversityXiangtan 411105HunanChina School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007HenanChina Analytical and Testing Center South China University of TechnologyGuangzhou 510640GuangdongChina Department of Chemistry and State Key Laboratory of Synthetic Chemistry The University of Hong KongPokfulam RoadHong Kong 999077China

Combining photocatalytic organic reactions with CO_(2)reduction is an efficient solar energy utilization mode,but it is still limited by the organic species that can be matched and the low ***,ultrathin organic polymer with p-πconjugated structure(TPP)was rationally designed and prepared,and showed a high yield of CO(15.2 mmol g^(-1))and conversion of SAS coupled products(100%),far exceeding the organic polymer with P=O *** enhanced photoredox activity of TPP is ascribed to the orbital interaction between the p-orbital on phosphorus and theπ-orbitals of aromatic,which can accelerate the photoinduced charge carrier separation and improve the CO_(2)adsorption *** can also be used for the dehydrocoupling of various benzyl mercaptans to the corresponding SAS bond *** work provides a new concept for the efficient synthesis of disulfide bonds combined with CO_(2)reduction in a photoreaction system.

关键词： Photocatalytic coupled reaction Disulfide bond CO_(2)reduction High activity Organic polymer

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The development of a rapid high-quality universal nucleic acid extraction kit based on magnetic separation

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Science China Chemistry 2017年第12期60卷 1602-1608页

作者： Bo Li Xianbo Mou Zhu Chen Hui Chen Yan Deng Song Li Enben Su Lei He Nongyue He State Key Laboratory of Bioelectronics Southeast UniversityNanjing 210096China The Medical School Ningbo University Ningbo 315211China Economical Forest Cultivation and Utilization of 2011 Collaborative Innovation Center in Hunan Province Hunan Key Laboratory of Green Chemistry and Application of Biological NanotechnologyHunan University of TechnologyZhuzhou 412007China Getein Biotechnology Co. Ltd.Nanjing 211505China

Nucleic acid extraction is one of the bases in molecular biology and it is the indispensable process for nucleic acid detection. Due to its excellent characteristics, the method based on magnetic beads has become one of the main methods for nucleic acid *** this research, we have developed a rapid high-quality universal nucleic acid extraction kit based on magnetic beads(MBs) and named it MB-100. Some factors affecting nucleic acid extraction were optimized, such as particle size of MBs, surface groups of MBs and lysis time. Results demonstrated that micron-grade MBs@SiO_2 particles were much more appropriate for nucleic acid extraction and lysis time was 5 min. Simultaneously, the performance of MB-100 was explored. Results showed that it had much higher extraction efficiency than other two commercial kits, and the following PCR reaction also had much higher amplification efficiency.

关键词： extraction kit MBs@SiO2 lysis time extraction efficiency

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Ultrasensitive electrochemical sensor for luteolin based on MOFs-derived metal oxide/alloy-doped nitrogen-containing porous carbon composites

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Talanta 2026年 296卷

作者： Jiejun Li Liang Wang Caiyu Ge Zuwen Zheng Yijing Wang Pengcheng Zhao Junjie Fei Yixi Xie Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education Xiangtan University Xiangtan 411105 People's Republic of China Hunan Institute of Advanced Sensing and Information Technology Xiangtan University Xiangtan 411105 People's Republic of China Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University Xiangtan 411105 People's Republic of China

As a natural flavonoid with diverse pharmacological activities, luteolin has shown attractive potential in various applications such as drug discovery, food preservation, health care products, and cosmetics. The precise quantification of luteolin is not only crucial for optimizing its therapeutic efficacy, but also for ensuring compliance with safety standards, as its biological activity largely depends on concentration thresholds and excessive intake may lead to adverse reactions. Here, we have successfully developed an electrochemical sensing platform for luteolin using a simple synthesis strategy. The core of this platform lies in the composite of metal oxides/alloys and nitrogen-doped porous carbon obtained after pyrolysis, whose unique porous architecture and rich pyrrolic nitrogen structure provide efficient adsorption sites for luteolin, while the diverse active centers embedded in the composite significantly enhance its electrocatalytic efficacy. The carefully constructed FeCo-NC-800/GCE electrochemical sensing platform exhibits excellent performance in detecting luteolin. More importantly, we have successfully applied this sensing platform to the detection of luteolin in actual samples such as peanut shells, honeysuckle, and chrysanthemum, which verified the accurate identification of luteolin by FeCo-NC-800/GCE in complex environmental backgrounds and demonstrated its great potential in practical applications.

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High-entropy carbide ceramics: a perspective review

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Tungsten 2021年第2期3卷 131-142页

作者： Zhe Wang Zhong-Tao Li Shi-Jun Zhao Zheng-Gang Wu College of Materials Science and Engineering and Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan UniversityChangsha 410082China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China

High-entropy carbide ceramics(HECCs)exhibited a series of property superiority,such as high hardness,high oxidation resistance and adjustable range of thermal conductivity,making them great candidates for structural materials used in extreme service ***,current HECC-related reports can only provide limited guidance for the design of HECC materials with promising properties and stable structure or for their high-quality *** fill this gap,we proposed in the current review that integrated efforts should be taken in the following three aspects to advance the design and fabrication of high-performance ***,the rule for the single-phase formation needs to be theoretically identified using high-throughput density functional theory calculations(HTDFT)and a highly accurate predictive model for rapid compositional design warrants establishment through the combination of HTDFT and machine-learning *** parallel with the compositional design,the lack of theoretical foundation and guidance for the synthesis of highly dense and highly pure HECC materials necessitates extensive studies focusing on the principle for the synthesis of HECC pre-alloy powders and on the powder densification mechanisms during high-temperature ***,great attentions are to be paid to the mechanistic understandings on the mechanical,oxidation and thermal conduction behaviors of HECC materials;for example,the toughening and strengthening mechanisms of HECC materials could be elucidated through discerning the"HECC composition-stacking fault energy distribution/bonding state-dislocation behavior"correlations.

关键词： High-entropy carbide ceramics Phase formation Mechanical property Oxidation behavior Thermal conduction Fabrication

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Photoswitchable dual-color fluorescent polymeric nanoparticles for self-erased time-resolved information encryption and anti-counterfeiting

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Chinese Chemical Letters 2025年第7期36卷

作者： Wang, Hong Tian, Yong Wu, Tiancheng He, Shun Cui, Jiaxi Chen, Jian Chen, Xudong Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion Hunan Province College Key Laboratory of QSAR/QSPR School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China School of Resource & Environment and Safety Engineering Hunan University of Science and Technology Xiangtan 411201 China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory Jieyang 515200 China School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 China

Photoswitchable fluorescent polymeric nanoparticles were widely concerned because of their excellent features including the flexible design, easy preparation and functionalization, and thus exhibited great application potential in information encryption, anti-counterfeiting, but remained challenging in improving the security. Herein, we described a self-erased time-resolved information encryption via using photoswitchable dual-color fluorescent polymeric nanoparticles (PDFPNs) containing two fluorescence dyes (blue and red) and photochromic spiroxazine derivatives. In view of the different thermo-induced isomerization rates of photochromic spiroxazine derivatives in different flexible substrates, the decoloration rate of PDFPNs can be programmatically tuned by regulating ratio between rigid polymer and flexible polymer. Therefore, after ultraviolet light (UV) irradiation, correct information could only be recognized in preestablished time during the self-erased process. Our results indicated that PDFPNs exhibited fast photo-responsibility (2 min), high fluorescence contrast, well-pleasing photo-reversibility (>20 times), and programmable thermo-responsiveness (24 s-6 h). We thus demonstrated their application in the self-erased time-resolved information encryption and anti-counterfeiting with high security. © 2025

关键词： FRET Photoswitchable dual-color fluorescence Polymeric nanoparticles Self-erasure Time-resolved information encryption

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Building national eco-cultural protection areas and the Xiangxi practice in hunan province

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Journal of Geographical Sciences 2020年第12期30卷 2076-2092页

作者： LIU Chunla WU Liping XU Mei ZENG Fanchao JIAO Lipeng College of Resources and Environment Sciences Hunan Normal UniversityChangsha 410081China Key Laboratory of Geospatial Big Data Mining and Application Hunan ProvinceChangsha 410081China College of Tourism Central South University of Forestry and TechnologyChangsha 410004China

Since 2007,the Chinese government has initiated the building of national eco-cultural protection areas(NECPAs),thereby embarking on a significant transformation of the model of intangible cultural heritage(IC H)protection in *** understand the origin and outputs of this policy,this paper demonstrates the context of China's *** proposes a conceptual NECPA framework that mainly features regional overall ICH *** is followed by an examination of the case of Xiangxi in Western hunan as a pilot zone for China’s eco-cultural *** has performed much related work to promote NECPAs and made great progress in regional overall ICH *** insight suggests that there are benefits and costs associated with promotion of China's NECPAs and regional overall ICH *** the advantages of institutional innovation,the unexpected side effects actually undermine the success of plan implementation.

关键词： national eco-cultural protection area intangible cultural heritage regional overall protection Xiangxi China

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Research on the Source-Load Interactive Scheduling Strategy for Modern Industrial Parks 2

Research on the Source-Load Interactive Scheduling Strategy ...

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2019 2nd International Symposium on Power Electronics and Control Engineering, ISPECE 2019

作者： Haibo, Tan Kai, Li Mouhai, Liu Haiyuan, Wang Cong, Tan Zhiguo, Liu Changsha410004 China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha410004 China

Aiming at the problems of diversified demand for electricity, high rate of load growth, limited distribution network corridor and single power supply mode in industrial parks, this paper explores a new scheduling strategy, studies a mechanism of source-load interactive scheduling for modern industrial parks, and puts forward three scheduling strategies, namely, optimal electricity price, friendly power grid and enhanced production. The strategy has been applied in a smart industrial park of hunan Power Grid. The application results show that the method can effectively improve the power supply capacity of the modern industrial parks, reduce the total cost of electricity, and enhance the load rate of distribution transformers, and it also has high economic and practical value. © Published under licence by IOP Publishing Ltd.

关键词： Scheduling

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