检索结果-内蒙古大学图书馆

Peak-like three-dimensional CoFe_(2)O_(4)/carbon nanotube decorated bamboo fabrics for simultaneous solar-thermal evaporation of water and photocatalytic degradation of bisphenol A

引用

Journal of Materials Science & technology 2024年第12期179卷 40-49页

作者： Rui-Jie Pan Jing Wu Jin Qu Tingting Zhang Fan-Zhen Jiao Mang Zhao Meng-Yan Han Xiaofeng Li Zhong-Zhen Yu State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing 100029China

Catalytic CoFe_(2)O_(4) and solar-thermal carbon nanotube decorated bamboo fabrics(CCBF)are fabricated for integrating efficient solar steam generation from wastewater with catalytic degradation of its organic *** to the numerous porous channels and polar groups of bamboo fabric and the efficient solar-thermal energy conversion of black carbon nanotubes,the porous and hydrophilic CCBF exhibits fast upward transport of water,efficient solar light absorption,and high solar-thermal energy conversion *** decorated CoFe_(2)O_(4) not only enhances the solar-thermal energy conversion efficiency of CCBF but also activates potassium peroxymonosulfate to generate abundant highly active species for catalytic degradation of bisphenol A(BPA).Furthermore,folding the CCBF into a peak-like 3D evaporator can en-hance solar energy utilization,and gain environmental energy for promoting solar-thermal water evapo-ration and catalytic degradation *** 3D CCBF evaporator achieves a water evaporation rate of 2.72 kg m^(-2) h^(-1) under 1-sun ***,100%of the BPA in the seawater can be degraded within 10 *** exceptional high purification efficiency of 27.72 kg m^(-2) h^(-1) is achieved with the 3D evaporator during a long-term treatment of BPA-containing seawater under 1-sun *** work demonstrates efficient purification of seawater/wastewater with both metal ions and organic pollutants by simultaneous solar-thermal evaporation of water and catalytic degradation of organic pollutants.

关键词： Solar-thermal water evaporation Seawater desalination Catalytic degradation Carbon nanotubes CoFe_(2)O_(4)

来源：评论

学校读者我要写书评

暂无评论

Nonlinear Multiscale Modeling of Multi-Machine Power Systems Integrated with Photovoltaics

Nonlinear Multiscale Modeling of Multi-Machine Power Systems...

引用

2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Wu, Jiaqi Han, Miao Zhan, Meng Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350307832

Large-scale photovoltaics (PVs) connected to the power grid through power electronic equipment have greatly changed the dynamics of the traditional power systems dominated by synchronous generators (SGs), bringing significant challenges to modeling and analysis of modern power systems. In this paper, a nonlinear model of multi-machine power systems integrated with PVs is established to reveal the multi-timescale transient synchronization characteristics using the singular perturbation technique. The fast subsystem containing the dynamics of the DC voltage control, terminal voltage control, and phase-locked loop, and the slow subsystem containing the dynamics of the rotor swing can effectively reflect the dynamics of multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, respectively. The proposed model provides a clearer physical picture of dynamics in the multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, and serves as the foundational model for further stability analysis. Finally, simulation results verify the validity of the proposed model. © 2023 IEEE.

关键词： Dynamics

来源：评论

学校读者我要写书评

暂无评论

Local chemical ordering and its impact on radiation damage behavior of multi-principal element alloys

引用

Journal of Materials Science & technology 2023年第4期135卷 13-25页

作者： Leqing Liu Xiongjun Liu Qing Du Hui Wang Yuan Wu Suihe Jiang Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

Multi-principal element alloys(MPEAs)have attracted much attention as future nuclear materials due to their extraordinary radiation *** this work,we have elucidated the development of local chemical orderings(LCOs)and their influences on radiation damage behavior in the typical CrFeNi MPEA by hybrid-molecular dynamics and Monte Carlo *** was found that considerable LCOs consist-ing of the Cr-Cr and Ni-Fe short-range orders existed in the ordered configuration with optimized system *** modeling the accumulation cascades up to 1000 recoils,we revealed that the size of de-fect clusters and dislocation loops is smaller in the ordered configuration than those in the random one,although the former formed more Frenkel pairs(i.e.,self-interstitials and vacancies).In addition,the dis-tribution of dislocation loops is relatively more dispersed in the ordered configuration,and the stair-rod dislocations related to irradiation swelling are also smaller,implying that the existence of LCOs is con-ducive to enhancing radiation damage *** understand the underlying mechanism,the effects of LCOs on the formation and evolution of defects and radiation resistance were discussed from the aspects of atomic bonding,migration path,and energy of defect diffusion,which provides theoretical guidance for the design of MPEAs with enhanced radiation resistance.

关键词： Multi-principal element alloys Local chemical ordering Radiation damage Dislocation evolution Molecular dynamics simulation

来源：评论

学校读者我要写书评

暂无评论

A Novel Variable Impedance Design Concept of PM Fault Tolerant Machine 26

A Novel Variable Impedance Design Concept of PM Fault Tolera...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Wang, Runyu Li, Dawei Fan, Xinggang Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350317589

A novel variable impedance fault tolerant design concept is proposed in this paper for high reliable PM machines. The special fault tolerant ring structure realizes the automatic transformation of the machine from low impedance in healthy operation to ultra-high impedance in fault operation, which effectively suppresses the short-circuit current. First, the design guidelines for fault tolerant ring and the fault tolerance mechanism of variable impedance are introduced. Subsequently, two variable impedance machine topologies with separated and integrated fault tolerant rings are investigated. Finally, the prototypes are fabricated and the experimental results show that the proposed variable impedance topology has a turn-to-turn short-circuit current suppression capability that far exceeds that of the conventional fault tolerant topology. © 2023 IEEE.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

General Description of Solid Armatures in electromagnetic Railguns 10

General Description of Solid Armatures in Electromagnetic Ra...

引用

10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Chen, Lixue Zhang, Wenhao Li, Lidong Xu, Shengqin State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789038661353

Armature, as an important part of the electromagnetic launch system, is a current carrier which converts electric energy into kinetic energy of projectiles, and it often suffers extreme environment in the launch process. Therefore, the performance of launch system is directly affected by the armature whose structure is the fundamental of the application of launch technology. Among various armature types, solid armatures are the most widely used because of some characteristics of them, like high efficiency and low mass. Based on some key functions of solid armatures, three kinds of requirements including current-carrying capacity, mechanical pressure and electromagnetic contact pressure are proposed in this paper. Besides, research progress of material and structure of the solid armature and its optimization is also introduced in this paper. © 2024 Eindhoven University of technology.

关键词： Kinetic energy

来源：评论

学校读者我要写书评

暂无评论

Precipitation Behavior of MnS Inclusion in Unidirectionally-solidified Fe–18Mn–1Al–0.3C Steels

引用

Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第3期111卷 122-130页

作者： Fan, Yuewen Kameda, Kouki Hu, Xiaojun Matsuura, Hiroyuki State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing China Department of Materials Engineering Graduate School of Engineering The University of Tokyo Japan

In order to reasonably control the precipitation of inclusions during solidification in TWIP steels, the precipitation behavior of typical MnS inclusions in high manganese steel was investigated by unidirectional solidification experiments. Through the combined analyses using ASEM-EDS, optical microscope, and thermodynamic calculation, it was found that Mn concentration in the liquid metal region were higher than those in the solid metal region. Furthermore, closer to the inclusion the liquid phase was, higher its Mn content was. In Fe–18mass%Mn–1Al–0.3C, MnS inclusions can precipitate at the positions located in the junction of dendrites at the end of the solidification (solid fraction fS = 0.96), Mn content reaching 34.88 mass%. Already existing Al2O3 particles could become the core of MnS to form composite inclusions to promote the MnS precipitation during the solidification process. When fS achieved 0.7 leading the Mn segregation in the liquid phase to 25 mass%, MnS starts to precipitate to attach the Al2O3 surface to form composite inclusion. © 2025 The Iron and Steel Institute of Japan.

关键词： Manganese steel

来源：评论

学校读者我要写书评

暂无评论

DC Overvoltage Analysis of GFM-controlled Wind Farm Connected via MMC-HVDC System Caused by Receiving-end AC Faults 10

DC Overvoltage Analysis of GFM-controlled Wind Farm Connecte...

引用

10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Chen, Siying Cheng, Min Li, Yingbiao Yu, Jiawei Zhu, Yihua Wu, Mingkang Hu, Jiabing Yan, Jianan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering China Yunnan Power Grid China China

ISBN: (纸本)9798350351330

DC overvoltage occurs when short circuit fault exists at the receiving-end and is harmful to the safety of the system where wind farms are connected to the grid through high-voltage direct current (HVDC) transmission based on the modular multilevel converter (MMC). To address this issue, this paper first analyzed the mechanism of the DC overvoltage and innovatively proposed a strategy in which grid-forming-controlled wind farms are integrated into the AC grid through MMC-HVDC, whose sending-end applies grid-following control and constant DC voltage control. However, secondary DC overvoltage appears during the fault recovery stage and is mainly caused by the saturation of the PI controller of constant active power control. Simulations are carried out on a test with MATLAB/Simulink, and results verify the efficacy of the proposed methods in suppressing DC overvoltage that appeared during receiving-end faults and their recovery stage. © 2024 IEEE.

关键词： MATLAB

来源：评论

学校读者我要写书评

暂无评论

Study on the Effect of Metal Vapor on the Post-Arc Process in Vacuum Arc with High di/dt Condition 7

Study on the Effect of Metal Vapor on the Post-Arc Process i...

引用

7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Liu, Liming Liu, Shan Yuan, Zhao Chen, Lixue Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China

ISBN: (纸本)9798350345094

The post-arc process directly affects the interrupting performance of the vacuum circuit breakers. In this paper, the current with high di/dt breaking experiments were carried out. The post-arc current and post-arc charge were obtained by experiments. The variation of post-arc current amplitude, duration and post-arc charge with di/dt were analyzed. The effects of ionization of metal vapor and its collision with charged particles on the post arc charge and duration of post-arc current were discussed. © 2023 IEEE.

关键词： Electric circuit breakers

来源：评论

学校读者我要写书评

暂无评论

A Graph Reinforcement Learning Algorithm for Unit Commitment 7

A Graph Reinforcement Learning Algorithm for Unit Commitment

引用

7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Gao, Liqian Wei, Lishen Li, Sheng Fang, Jiakun Ai, Xiaomeng Cui, Shichang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China

ISBN: (纸本)9798350345094

Unit commitment (UC) is the key problem in power system, and efficiently getting a solution with high quality can bring great economic and social benefits. Nowadays, as the scale of the power system has been increasing, the traditional optimization algorithms are deficient in solving accuracy and computational complexity. Artificial intelligence algorithms with powerful data process capabilities are developing rapidly and have been applied in the power system and achieved good results. Therefore, this paper proposes an algorithm to solve the UC problem based on graph reinforcement learning (GRL). Firstly, the markov decision process (MDP) of the UC problem is described based on its characteristics associated with the objective function and constraints, and the reward function is designed to update the strategy of the agent. Secondly, graph convolutional network (GCN) is chosen to better capture the topological feature of power system. Combined with deep deterministic policy gradient (DDPG) algorithm, a GRL algorithm is proposed to solve the UC problem. Thirdly, case studies are carried out to demonstrate the feasibility and performance of the proposed algorithm. © 2023 IEEE.

关键词： Reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Efficiency Estimates of Integrated Two-Speed e-Powertrain System under WLTP Driving Cycle for Electric Vehicle 26

Efficiency Estimates of Integrated Two-Speed e-Powertrain Sy...

引用

26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Feng, Shun Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350317589

Efficiency is always one of key metrics for electric powertrain system to make the most of battery stored energy and boost electric vehicle's range. This paper presents a systematic method to estimate efficiency capability for an integrated two-speed e-Powertrain system. Overall system is modelled in MATLAB/Simulink. Inverter power, voltage and current requirements are defined from system specifications. Inverter losses, efficiencies and thermal conditions are investigated at switching frequencies of SkHz and 12kHz. With both traction motor and gearbox efficiency maps, 93.2% system peak efficiency and 90.2% Worldwide Harmonized Light Vehicle Test Procedure (WLTP) Class 3b driving cycle efficiency are obtained to verify that design targets are met in simulations. A prototype is built to validate system efficiency performance in the thermal chamber during tests. © 2023 IEEE.

关键词： Traction motors

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：