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Three-Component Synthesis of 2-Heteroaryl-3-hydroxybenzo[b]- thiophenes under Transition-Metal-Free Conditions

Chinese Journal of Chemistry 2021年第9期39卷 2483-2488页

作者： Dahan Wang Fuhong Xiao Feng Zhang Guo-Jun Deng 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 UniversityXiangtanHunan 411105China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhouGuangdong 510640China

A convenient synthetic route to 2-heteroaryl-3-hydroxybenzo[b]thiophene derivatives via K_(2)CO_(3)-promoted multicomponent cycliza-tion between o-halogenated benzaldehyde,2-methylquinolines and sulfur powder has been *** reaction is performed smoothly under simple conditions to give the corresponding products in moderate to good *** resultant 3-hydroxybenzo[b]thiophenes have been proved to be versatile building blocks in a range of transition-metal-catalyzed cross-coupling reactions.

关键词： Benzothiophenes Transition-metal-free C-H activation Sulfur Multicomponent reactions

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Optimization design of welding parameters of key components of car body based on finite element 5

Optimization design of welding parameters of key components ...

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2024 5th International Conference on Advanced Materials and Intelligent Manufacturing, ICAMIM 2024

作者： Li, Lina Fa, Ping Sun, Hongchang He, Chuan Qiao, Zhiliang Department of Automobile Engineering Tianjin Transportation Technical College Tianjin China Huaiyuan County Vocational and Technical School Anhui Province Bengbu City China School of Mechanical Engineering Tianjin University of Technology and Education Tianjin China Tianjin Key Laboratory of Intelligent Robot Technology and Application Enterprises Tianjin China

The characteristics of the welding heat source, the morphology of the molten pool, the formation mechanism of the weld, and the amount of heat input have an important and direct influence on the welding quality and performance of the joint. At present, the empirical curve that depends on the experimental results or the calculation formula of statistics cannot comprehensively evaluate the impact of welding on the mechanical properties of the whole structure. Therefore, this research is based on the finite element analysis technique of Simufact Welding software and analyzes the evolution of the temperature field, stress field, and the deformation of the residual stress in the welding process, and provides a powerful tool and a lot of support for welding technology. The aim of the study is to develop an accurate numerical simulation method for the weld temperature field and a dynamic simulation analysis system for the weld stress field and deformation. 2025 Published under licence by IOP Publishing Ltd.

关键词： Residual stresses

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Design and application of power customer label application effect evaluation mechanism 7

Design and application of power customer label application e...

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2022 7th International Conference on Electronic technology and Information Science, ICETIS 2022

作者： Peng, Yuanhao Ye, Zhi Shen, Haoping Peng, Haijun State Grid Hunan Electric Power Limited Company Changsha410004 China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha410004 China

ISBN: (纸本)9783800757794

Customer tag is a way to know customers. It is a feature identification highly refined and summarized from data, which can support efficient decision-making. With the deepening application of customer labels in various businesses of power companies, how to realize the continuous optimization of inherent customer labels has become a difficulty. Focusing on the main line of power customer label operation evaluation analysis optimization, this paper constructs a single label application effectiveness evaluation system and label scenario application evaluation system, analyzes the existing labels based on the evaluation system, and establishes rule models and exception identification models such as label optimization recommendation, offline reminder, promotion reminder and exception monitoring based on the analysis. Effectively realize the systematization and scientific diagnosis of label application, and promote the comprehensive and efficient development of evaluation and construction. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Sales

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Iron-catalyzed indolo[2,3-c]quinoline synthesis from nitroarenes and benzylic alcohols/aldehydes promoted by elemental sulfur

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Green Synthesis and Catalysis 2022年第1期3卷 95-101页

作者： Rong Li Shuxin Jiang Haolin Zheng Hanwen Lei Zhi Huang Shanping Chen Guo-Jun Deng 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 411105China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates(South China University of Technology) Guangzhou 510640China

An iron-catalyzed strategy for the rapid synthesis of indolo[2,3-c]quinolines has been *** cascade reaction involving alcohol oxidation,nitro reduction,and oxidative annulation was achieved in a *** present protocol was started from mono-functionalized indoles and readily available benzylic alcohols/aldehydes,affording a variety of functionalized indolo[2,3-c]quinolines in satisfactory yields.

关键词： Iron-catalyzed Nitro reduction Alcohol oxidation Oxidative annulation Indolo[2,3-c]quinolines

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超高性能混凝土钢纤维-基体界面黏结性能研究综述

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Engineering 2023年第3期22卷 215-232页

作者：邓毓琳张祖华史才军吴泽媚张超慧 Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil EngineeringHunan UniversityChangsha 410082China Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghai 201804China

超高性能混凝土(UHPC)是一种相对较新的水泥混凝土复合材料,由于其优异的机械强度和耐久性,在基础设施建设中具有巨大的应用潜力。钢纤维与基体的界面黏结性能是决定UHPC其他力学性能的主要因素,包括抗拉、抗折、抗压强度和破坏模式(断... 详细信息

超高性能混凝土(UHPC)是一种相对较新的水泥混凝土复合材料,由于其优异的机械强度和耐久性,在基础设施建设中具有巨大的应用潜力。钢纤维与基体的界面黏结性能是决定UHPC其他力学性能的主要因素,包括抗拉、抗折、抗压强度和破坏模式(断裂行为)。本文通过讨论并比较多种纤维拉拔测试方法和分析模型,全面综述了UHPC的纤维-基体黏结行为的研究进展;详细确定并讨论了影响纤维-基体黏结的参数,包括纤维的几何形状和方向、表面处理、基体的组成和强度。最后,基于现有研究,对未来UHPC增强方法和测试细节提出了建议。

关键词： Ultra-high performance concrete Interfacial bond Steel fiber Pullout behavior

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Online Monitoring Method for Metering Errors in Charging Facilities Based on Energy Conservation and Double Metering Comparison 23

Online Monitoring Method for Metering Errors in Charging Fac...

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Proceedings of the 6th International Conference on Information Technologies and Electrical Engineering

作者： Jing Yang Cong Wu Zhi Wang Chao Liu Mouhai Liu State Grid Hunan Electric Power Corporation Limited China and Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology China

ISBN: (纸本)9798400708299

The electric energy metering device of charging facilities is easily affected by factors such as power quality, abnormal fluctuations in fixed loss in the station area, and distortion signals, and it is difficult to ensure the accuracy of electric energy measurement of charging facilities. In order to ensure the fairness, impartiality, scientific accuracy of measuring charging facilities, and enhance the accuracy of measurement, a hardware and software-based method combining energy conservation and comparison of primary and secondary metering modules is proposed for online monitoring of charging pile errors. Firstly, the measurement errors of each charging pile are calculated based on energy conservation. Secondly, for suspected charging piles with excessive errors, a secondary judgment is conducted using the primary and secondary metering module approach to enhance the robustness of online error monitoring. This method has the advantages of simple structure, low cost, high monitoring efficiency, and accuracy.

关键词： Charging facilities Energy conservation Metering errors Power quality

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Progress in developing self-consolidating concrete(SCC)constituting recycled concrete aggregates:A review

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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 522-537页

作者： Yu-Xuan Liu Tung-Chai Ling Kim-Hung Mo Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil EngineeringHunan UniversityChangsha 410082China Department of Civil Engineering Faculty of EngineeringUniversity of MalayaMalaysia

Recycled concrete aggregate(RCA)derived from demolition waste has been widely explored for use in civil engineering *** of the promising strategies globally is to incorporate RCA into concrete ***,the use of RCA in high-performance concrete,such as self-consolidating concrete(SCC),has only been studied in the past *** paper summarizes recent publications on the use of coarse and/or fine RCA in *** expected,the high-water absorption and porous structure of RCA have posed challenges in producing a high-fluidity *** to an analysis of published data,a lower strength reduction(within 23%regardless of coarse RCA content)is observed in SCC compared with vibrated concrete,possibly due to the higher paste content in the SCC matrix,which enhances the weak surface layer of RCA and interfacial transition ***,SCC tends to become less durable with RCA substitution although the deterioration can be minimized by using treated RCA through removing or strengthening the adhered *** date,the information reported on the role of RCA in the long-term performance of SCC is still limited;thus,a wide range of research is needed to demonstrate the feasibility of RCA–SCC in field applications.

关键词： self-consolidating concrete construction and demolition waste recycled concrete aggregate(RCA) durability property enhancement

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Recent advances of SiO_(x)-based anodes for sustainable lithium-ion batteries

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Nano Research Energy 2023年第3期2卷 66-88页

作者： Mengyu Zhang Naiwen Liang Derek Hao Zuxin Chen Fan Zhang Jiang Yin Yahui Yang Li-shan Yang Key Laboratory of Chemical Biology&Traditional Chinese Medicine Research(Ministry of Education of China) National and Local Joint Engineering Laboratory for New Petrochemical Materials and Fine Utilization of ResourcesKey Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan ProvinceHunan Normal UniversityChangsha 410081China School of Science STEM CollegeRMIT UniversityMelbourne 3000Australia School of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China International Iberian Nanotechnology Laboratory(INL) 4715-330 BragaPortugal

The world is facing an ever-growing global energy crisis with unprecedented depth and *** sustainable development of high energy density lithium-ion batteries for electric vehicles and portable electric devices has become a feasible way to deal with this *** suboxides(SiO_(x))have been deemed as one of the most promising anode materials because of their ultrahigh theoretical lithium storage capacity,proper working potential,natural abundance,and environmental ***,the mass utilization of SiO_(x)-based anodes is severely obstructed by their low electrical conductivity and inevitable volume *** lithium silicate and lithium oxide formed in the first lithiation process act as buffer layers to some extent,it is urgent to address the accompanying low initial Coulombic efficiency and unsatisfactory cycling *** this review,we summarized recent advances in the synthesis methods of SiO_(x)-based ***,the benefits and shortcomings of the various methods are briefly ***,we discussed the effective combination of SiO_(x) with carbon materials and designs of porous structure,which could considerably enhance the electrochemical performance in ***,progresses on the modified strategies,advanced characteristics and industrial applications for SiO_(x)-based anodes are also ***,the remaining challenges encountered and future perspectives on SiO_(x)-based anodes are highlighted.

关键词： SiO_(x)anodes lithium-ion batteries synthesis methods SiO_(x)/C composites porous

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Short-term Traffic Flow Prediction by Graph Deep Learning with Spatial Temporal Modeling 2

Short-term Traffic Flow Prediction by Graph Deep Learning wi...

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2nd International Conference on Electronic Information technology and Smart Agriculture, ICEITSA 2022

作者： Yuan, Lilian Fang, Weilin Xiao, Hongbo Xiao, Jianhua Shi, Yuanquan Yang, Yujun School of Computer Science and Engineering Huaihua University Hunan Huaihua418000 China Intelligent Processing and Application in Hunan Province Universities Key Laboratory of Wuling-Mountain Health Big Data Hunan Huaihua418000 China Wuling-Mountain Ecological Agriculture in Hunan Province Key Laboratory of Intelligent Control Technology for Huaihua Hunan418000 China

ISBN: (纸本)9781665464017

An extensive amount of research applications on traffic flow prediction models taking into account spatio-temporal modeling have been undertaken in recent years. Relative to traditional spatio-temporal modeling approaches, good application results have been achieved in predicting traffic flow. However, in real life, traffic flow proves to be time- and space-dependent, which poses difficulties for accurate modeling of traffic flow prediction. To address these problems, we propose the ST-GNN-GRU model, which mainly contains S-GNN and T-GRU modules. The model uses a combination of spatio-temporal modeling and deep learning, which can not only cope with the spatio-temporal modeling problem, but also improve the traffic flow prediction accuracy. The experiments are conducted using the METR-LA dataset, and the outcomes show that the proposed method performs more effectively than other baseline approaches. © 2022 IEEE.

关键词： Graph neural networks

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Electrosynthesis of Azobenzenes Directly from Nitrobenzenes

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Chinese Journal of Chemistry 2021年第12期39卷 3334-3338页

作者： Yanfeng Ma Shanghui Wu Shuxin Jiang Fuhong Xiao Guo-Jun Deng 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 UniversityXiangtanHunan 411105China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates(South China University of Technology) GuangzhouGuangdong 510640China

The electrochemical reduction strategy of nitrobenzenes is *** chemistry occurs under ambient *** protocol uses inert electrodes and the solvent,DMSO,plays a dual role as a reducing *** synthetic value has been demons... 详细信息

关键词： Azo compounds Nitro reduction Electrochemistry Nitrobenzenes Green chemistry

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