检索结果-内蒙古大学图书馆

Decomposition mechanism of environmentally friendly insulating medium HFO1234zeE/N_(2)gas mixture under partial discharge

引用

High Voltage 2022年第6期7卷 1069-1079页

作者： Lin Lin Qingguo Chen Xinyu Wang Hui Zhang Huiyong Li Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinChina School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbinChina Heilongjiang Institute for Drug Control Harbin HeilongjiangChina

Hydrofluoroolefin HFO1234zeE(trans-1,3,3,3-tetrafluoroprop-1-ene)is an environmentally friendly gas insulating medium that has the potential to replace *** clarify the decomposition paths and products of an HFO1234zeE/N_(2)gas mixture under partial discharge,the decomposition mechanism is explored with density functional *** results indicate that only HFO1234zeE molecules decompose in the range of low-temperature plasma,and electrons with different energies interact with molecules and cause them to decompose through different ***,products are generated by free radical recombination,addition reactions and internal configurational conversions of the *** experimental investigation of decomposition of the HFO1234zeE/N_(2)gas mixture with different discharge modes is carried out,and it is found that the products calculated with density functional theory are consistent with those seen *** results show the decomposition mechanism of the insulating gas under partial discharge and provide a theoretical basis for the application of HFO1234zeE.

关键词： theory. mixture mechanism

来源：评论

学校读者我要写书评

暂无评论

Construction control of rigid frame-continuous girder bridge based on grey theory

引用

Journal of engineering and Applied science 2024年第1期71卷 171页

作者： Wan, Lijun Qiao, Jiaqi Sun, Quansheng Liu, Jingyang School of Civil Engineering and Transportation Northeast Forestry University Harbin150050 China Institute of Cold Regions Science and Engineering Northeast Forestry University Harbin150050 China Heilongjiang Provincial Key Laboratory of Bridge Construction Control Inspection and Reinforcement Technology Harbin150050 China

To address the issue of excessive mid-span deflection in rigid frame-continuous girder bridges during the later stages of normal use and to provide a basis for setting the pre-camber of this bridge type. This study focused on a specific rigid frame-continuous girder bridge. Based on the outcomes of finite element analysis, a GM(1,1) model developed using grey theory was utilized to forecast the vertical deflection of the primary girder in the construction phase of a rigid frame-continuous girder bridge, resulting in notable outcomes. The results suggest that the GM(1,1) model grounded in grey theory offers precise estimations of the vertical deflection of the primary girder during the prestressing tendon tensioning stage, displaying a minimal deviation of merely 1.73 mm compared to actual measurements. Consequently, applying the GM(1,1) model based on grey theory for projecting the vertical deflection of the primary girder in the construction process of rigid frame-continuous girder bridges can advance the accuracy of construction management. Through comparative analysis of measured values estimated values and theoretical values at the construction site, it is evident that the predictive model effectively controls the displacement, thus serving as a reference for construction control in similar projects. © The Author(s) 2024.

关键词： Deflection (structures)

来源：评论

学校读者我要写书评

暂无评论

Autogenous healing mechanism of cement-based materials

引用

Frontiers of Structural and Civil engineering 2023年第6期17卷 948-963页

作者： Desheng LI Hao ZHENG Kang GU Lei LANG Shang SHI Bing CHEN Department of Civil Engineering School of ScienceNanjing University of Science and TechnologyNanjing210094China School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin150090China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsWuhan430071China

Autogenous self-healing is the innate and fundamental repair capability of cement-based materials for healing *** researchers have investigated factors that influence autogenous ***,systematic research on the autogenous healing mechanism of cement-based materials is *** healing process mainly involves a chemical process,including further hydration of unhydrated cement and carbonation of calcium oxide and calcium ***,the autogenous healing process is influenced by the material constituents of the cement composite and the ambient *** this study,different factors influencing the healing process of cement-based materials were *** electron microscopy and optical microscopy were used to examine the autogenous healing mechanism,and the maximum healing capacity was ***,detailed theoretical analysis and quantitative detection of autogenous healing were *** study provides a valuable reference for developing an improved healing technique for cement-based composites.

关键词： autogenous healing cement-based materials healing mechanism aggregation effect

来源：评论

学校读者我要写书评

暂无评论

Sliding Mode control in Power Converters and Drives: A Review

引用

IEEE/CAA Journal of Automatica Sinica 2022年第3期9卷 392-406页

作者： Ligang Wu Jianxing Liu Sergio Vazquez Sudip K.Mazumder IEEE Department of Control Science and Engineering Harbin Institute of TechnologyHarbin 150001China Electronic Engineering Department Universidad de Sevilla41092 SevillaSpain Electrical and Computer Engineering Department University of Illinois ChicagoChicagoIL 60607 USA

Sliding mode control(SMC)has been studied since the 1950s and widely used in practical applications due to its insensitivity to matched *** aim of this paper is to present a review of SMC describing the key developments and examining the new trends and challenges for its application to power electronic *** fundamental theory of SMC is briefly reviewed and the key technical problems associated with the implementation of SMC to power converters and drives,such chattering phenomenon and variable switching frequency,are discussed and *** recent developments in SMC systems,future challenges and perspectives of SMC for power converters are discussed.

关键词： Motor drive power electronics systems sliding mode control

来源：评论

学校读者我要写书评

暂无评论

Dynamic Event-Triggered Fixed-Time Consensus Analysis of Multi-Agent Systems Under Input Delays and Switching Topologies 3

Dynamic Event-Triggered Fixed-Time Consensus Analysis of Mul...

引用

3rd IEEE Industrial Electronics Society Annual On-Line Conference, ONCON 2024

作者： Zhang, Yu Li, Yajing Ran, Guangtao Yu, Hao Ma, Guangfu Department of Automation Shenzhen518055 China Shanghai Institute of Aerospace System Engineering Shanghai200241 China Harbin Institute of Technology Department of Control Science and Engineering Harbin150001 China School of Automation Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9798331540319

This paper proposes a dynamic event-triggered control method for first-order multi-agent systems with input delays and disturbances under switching topologies. The controller design and its properties of dynamic event-triggered fixed-time consensus are presented in detail. Furthermore, agents can achieve consensus in a fixed time for any initial conditions and topologies that comply with the control protocol. Zeno behavior is avoided. Simulation examples demonstrate the effectiveness of the proposed algorithm and simulate scenarios in which the communication environment deteriorates due to external disturbances affecting the MASs. © 2024 IEEE.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

Intermittent fault diagnosis based on EMD decomposition and convolutional neural network 2

Intermittent fault diagnosis based on EMD decomposition and ...

引用

2nd IEEE International Conference on Electrical, Automation and Computer engineering, ICEACE 2024

作者： Peng, Yu Liu, Yuhang Lin, Ruishi Xiang, Gang Wang, Shenhang Yang, Zhiming Beijing Aerospace Automatic Control Institute Department of System Engineering Beijing China Harbin Institute of Technology School of Electronics and Information Engineering Harbin China

ISBN: (纸本)9798350368208

The paper introduces an intermittent fault diagnosis method for analog circuits using EMD and CNN. The proposed method obtains the circuit output characteristics under different intermittent fault type using SPICE simulation. Then, EMD is used to extract the features and finally, the CNN model for fault detection and localization is built. The effectiveness of the method is validated through experiments in a three-phase SVPWM circuit. © 2024 IEEE.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Taobao User Purchase Behavior Prediction And Feature Analysis Based On Ensemble Learning 19

Taobao User Purchase Behavior Prediction And Feature Analysi...

引用

19th IEEE International Conference on e-Business engineering, ICEBE 2023

作者： Chengjie, Yang Wei, Qi Harbin Institute of Technology Department of Management Science and Engineering Harbin China

ISBN: (纸本)9798350325553

In this paper, we construct a prediction model of user purchase behaviour and apply the SHAP interpretation method to analyze the influence of features to improve the model's reliability. Based on users' accurate historical behaviour data disclosed under the Taobao e-commerce platform, this paper constructs features from five perspectives: user, item, item category, user-item interaction and user-category interaction. Three ensemble learning algorithms are used to construct the model, and the LightGBM model with the best effect is selected to predict user purchase behaviour. The SHAP interpretation method is used to analyze feature variables. The AUC value of the prediction model reaches about 84%, and the characteristics of the user-item interaction and the user significantly impact the prediction. Among them, the number of user-item behaviours on the day before the prediction date is the most crucial feature in predicting the purchasing behaviour of Taobao users. The SHAP interpretation method can consider the accuracy and interpretability of the machine learning prediction model, which is helpful to the following feature and model optimization work, provide a decision-making basis for users' accurate marketing, and make the results of the prediction model more effective and credible. © 2023 IEEE.

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

Design and Experimental Validation of a Worm-Like Tensegrity Robot for In-Pipe Locomotion

引用

Journal of Bionic engineering 2023年第2期20卷 515-529页

作者： Xiaolin Dai Yixiang Liu Wei Wang Rui Song Yibin Li Jie Zhao School of Control Science and Engineering Shandong UniversityJinan250061China Engineering Research Center of Intelligent Unmanned System of Ministry of Education Jinan250061China Shandong Research Institute of Industrial Technology Jinan250061China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin150080China

Traditional rigid-body in-pipe robots usually have complex and heavy structures with limited flexibility and *** soft in-pipe robots have great improvements in flexibility,they still have manufacturing difficulties due to their reliance on high-performance soft *** structure is a kind of self-stressed spatial structure consisting discrete rigid struts connected by a continuous net of tensional flexible strings,which combines the advantages of both rigid structures and soft *** applying tensegrity structures into robotics,this paper proposes a novel worm-like tensegrity robot for moving inside ***,a robot module capable of body deformation is designed based on the concept of tensegrity and its deformation performance is ***,the optimal parameters of the module are obtained based on the tensegrity *** deformation ability of the tensegrity module is tested ***,the worm-like tensegrity robot that can crawl inside pipes is developed by connecting three modules in *** performance and load capacity are tested on the prototype of the worm-like tensegrity robot by experiments of moving in horizontal pipe,vertical pipe,and elbow *** results demonstrate the effectiveness of the proposed design and suggest that the robot has high compliance,mobility,and adaptability although with simple structure and low cost.

关键词： Bio-inspired robot Soft robot application Tensegrity structure Pipe crawling

来源：评论

学校读者我要写书评

暂无评论

Polar materials for photocatalytic applications:A critical review

引用

Interdisciplinary Materials 2024年第4期3卷 530-564页

作者： Xiaoqing Liu Yu Zhang Cong Wang Lei Shen Department of Mechanical Engineering National University of SingaporeSingaporeSingapore School of Physics Harbin Institute of TechnologyHarbinPR China School of Materials Science and Engineering Engineering Research Center of Optoelectronic Functional MaterialsMinistry of EducationChangchun University of Science and TechnologyChangchunPR China

The critical challenges of the energy crisis and environmental degradation promote innovative approaches for energy ***-based photocatalytic technology,which transforms solar energy into chemical energy,emerges as a promising ***,the practical application of this technology faces several challenges,such as the rapid recombination of photogenerated electrons and holes,significantly limiting photocatalytic *** this review,we provide a detailed discussion,an insightful perspective,and a critical evaluation of recent advances,challenges,and opportunities in the field of photocatalysis using polar *** present a comprehensive examination of the photocatalytic mechanisms,activity,and diverse applications of photocatalysts based on polar *** also briefly discuss the engineering design of polar photocatalysis in experiments and its scalability in the *** review outlines future trends and potential breakthroughs in the photocatalytic field using polar materials,projecting their transformative impact on environmental chemistry and energy engineering.

关键词： 2D Janus structures ferroelectric materials heterostructures photocatalysts polar materials

来源：评论

学校读者我要写书评

暂无评论

Insights into the Origins of Solar-Assisted Electrochemical Water Oxidation in Allotropic Co_(5.47)N/CON Heterojunctions

引用

Energy & Environmental Materials 2024年第5期7卷 234-243页

作者： Sirui Liu Qiong Gao Bo Geng Lili Wu Zhikun Xu Xinzhi Ma Shijie Liu Boquan Li Mingyi Zhang Lirong Zhang Xitian Zhang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China School of Physics and Engineering Henan University of Science and Technology Luoyang 471023China School of Science Guangdong University of Petrochemical TechnologyMaoming 525000China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China College of Science Southern University of Science and TechnologyShenzhen 518055China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Solar irradiation can efficiently promote the kinetics of the oxygen evolution reaction(OER)during water splitting,where heterojunction catalysts exhibit excellent photoresponsive ***,insights into the origins of photoassisted OER catalysis remain unclear,especially the interfaced promotion under convergent solar irradiation(CSI).Herein,novel allotropic Co_(5.47)N/CoN heterojunctions were synthesized,and corresponding OER mechanisms under CSI were comprehensively uncovered from physical and chemical aspects using the in situ Raman technique and electrochemical cyclic voltammetry *** results provide a unique mechanism where high-energy UV light promotes the Co^(3+/4+)conversion process in addition to the ordinary photoelectric effect excitation of the Co^(2+)***,visible light under CSI can produce a photothermal effect for Co^(2+)excitation and Co^(3+/4+)conversion,which promotes the OER significantly more than the usual photoelectric *** a result,Co_(5.47)N/CoN(containing 28%CoN)obtained 317.9%OER enhancement,which provides a pathway for constructing excellent OER catalysts.

关键词： chemical origins in situ Raman OER photothermal effect physical origins

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：