检索结果-内蒙古大学图书馆

Efficient Visible‐Light‐Driven Z‐Scheme Overall Water Splitting Using a MgTa2O6−xNy/TaON Heterostructure Photocatalyst for H2Evolution†

引用

Angewandte Chemie 2015年第29期127卷

作者： Shanshan Chen Yu Qi Takashi Hisatomi Qian Ding Tomohiro Asai Zheng Li Su Su Khine Ma Fuxiang Zhang Kazunari Domen Can Li State Key Laboratory of Catalysis iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian National Laboratory for Clean Energy Dalian 116023 (China) University of Chinese Academy of Sciences Beijing 100049 (China) Department of Chemical System Engineering School of Engineering The University of Tokyo 7‐3‐1 Hongo Bunkyo‐ku Tokyo 113‐8656 (Japan)

An (oxy)nitride‐based heterostructure for powdered Z‐scheme overall water splitting is presented. Compared with the single MgTa 2 O 6− x N y or TaON photocatalyst, a MgTa 2 O 6− x N y /TaON heterostructure fabricated by a simple one‐pot nitridation route was demonstrated to effectively suppress the recombination of carriers by efficient spatial charge separation and decreased defect density. By employing Pt‐loaded MgTa 2 O 6− x N y /TaON as a H 2 ‐evolving photocatalyst, a Z‐scheme overall water splitting system with an apparent quantum efficiency (AQE) of 6.8 % at 420 nm was constructed (PtO x ‐WO 3 and IO 3 − /I − pairs were used as an O 2 ‐evolving photocatalyst and a redox mediator, respectively), the activity of which is circa 7 or 360 times of that using Pt‐TaON or Pt‐MgTa 2 O 6− x N y as a H 2 ‐evolving photocatalyst, respectively. To the best of our knowledge, this is the highest AQE among the powdered Z‐scheme overall water splitting systems ever reported.

关键词： Heterostrukturen Oxynitride Photokatalyse Wasserspaltung Wasserstoff

来源：评论

学校读者我要写书评

暂无评论

Design of Rated Power Control Strategy of Wind Turbine Based on Particle Swarm Optimization

引用

IOP Conference Series: Earth and Environmental Science 2018年第1期192卷

作者： YC Yang Y Liu P Song Y Cui Y Bai Department of Control and Computer Engineering North China Electric Power University Beijing 102206 China North China Electric Power Research Institute Co. Ltd. Smart Grid and New Energy Institute Beijing 100045 China Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory

In view of the reduction of wind turbine operating efficiency caused by wind speed measurement errors, this paper proposes a rated power control strategy for wind turbines for practical applications; in order to solve the problem that the pitch PI controller parameters of wind turbines are not easy to calculate and tune in the process of design and optimization, this paper proposes a complete set of methods for parameter tuning of pitch control PI controllers for wind turbines. This paper establishes a Bladed-Matlab co-simulation platform, uses Bladed software to build a complete model of a 2MW wind turbine, and designs a rated power control strategy for wind turbines. After the wind turbine model is linearized at different wind speed points by applying Bladed software, the linearized model for PI parameter tuning is obtained, and then the optimal PI parameters for each wind speed point are set by using particle swarm algorithm. According to the variation law between the PI parameters and the pitch angle obtained before, the PI parameters are adjusted adaptively by variable gain PI control. The simulation results show the superiority of the control strategy and parameter tuning method used in this paper.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on the Impact on Sub-synchronous Resonance Risk from DFIG Number and Series-compensated Degree

引用

Journal of Physics: Conference Series 2018年第4期1087卷

作者： M X Yin H Liu Y H Li W Song Department of Electrical and Electronic Engineering North China Electric Power University Baoding 071027 China State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co. Ltd. Beijing 100045 China Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Beijing 100045 China

Sub-synchronous resonance (SSR) occurred in the power system with both Doubly Fed Induction Generators (DFIGs) and series-compensated lines. Existing paper discovered the nonlinear relationship of SSR damping and the number of DFIGs. In this paper, the equivalent model of wind farms and series-compensated power system in Guyuan is built in RT-LAB. Based on that model, the SSR characteristics of wind farms in Guyuan area under different DFIG numbers and line parameters are investigated through impedance method. The results show that: 1) The relationship between SSR characteristics and DFIG number is nonlinear in Guyuan area. Under the condition of a given wind speed, there is certain number of DFIGs which will induce worst damping effect. 2) A higher series-compensated degree results in a less stable system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Erratum to: Effect of ambient pressures on laser-induced breakdown spectroscopy signals

引用

Frontiers of Physics 2024年第4期19卷 1-1页

作者： Zhang, Kaifan Song, Weiran Hou, Zongyu Wang, Zhe State Key Laboratory of Power System Operation and Control Tsinghua-Rio Tinto Joint Research Centre for Resources Energy and Sustainable Development International Joint Laboratory on Low Carbon Clean Energy Innovation Institute for Carbon Neutrality Department of Energy and Power Engineering Tsinghua University Beijing China Shanxi Research Institute for Clean Energy Tsinghua University Taiyuan China

The pressure legend in Fig. 6(a) was incorrectly labeled and has been updated in this new version.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Back Cover, Volume 42, Number 1, January 2025

引用

Journal of Field Robotics 2024年第1期42卷 ii-ii页

作者： Qi Shao Qixing Xia Zhonghan Lin Xuguang Dong Xin An Haoqi Zhao Zhangyi Li Xin-Jun Liu Wenqiang Dong Huichan Zhao Department of Mechanical Engineering Tsinghua University Beijing China State Key Laboratory of Tribology in Advanced Equipment Beijing China Beijing Key Lab of Precision/Ultra-Precision Manufacturing Equipment and Control Beijing China NPU Institute of Culture and Heritage (NICH) Northwestern Polytechnical University Xi'an Shaanxi China Key Laboratory of Archeological Exploration and Cultural Heritage Conservation Technology (Northwestern Polytechnical University) Ministry of Education Shaanxi China Xi'an Yuanzhi System Technology Co. Ltd. Shaanxi China

来源：评论

学校读者我要写书评

暂无评论

Dielectric BN nanosheet / PVDF composites with high thermal conductivity

引用

Journal of Physics: Conference Series 2021年第1期1857卷

作者： Zhengrong Zhou Chi Zhang Yalin Zhao Zhixiong Wu Hua Zhang Shibin Guo Rongjin Huang Laifeng Li State Key Laboratory of Technologies in Space Cryogenic Propellants Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Advanced Energy Research Center Shenzhen University Shenzhen 518060 China Key Laboratory of Optoelectronic Devices and System of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

With the development of electronic devices, high thermal conductivity polymer will become an ideal electronic packaging material. Therefore, Polyvinylidene fluoride (PVDF) nanocomposite was prepared doped with boron nitride nanosheet (BNNS), which has significantly improved thermal conductivity, excellent electrical insulation and outstanding flexibility. These nanocomposite films were prepared by mixing BNNS/PVDF in organic solution, drying, slicing, and then hot-pressing. Compared with the pristine polymers, the nanocomposite films have excellent thermal conduction, which indicates that new high-performance thermal conductivity materials will play an important role in high-power density electronic devices.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Natural drying yields efficient perovskite solar cells

DeCarbon

引用

DeCarbon 2023年 2卷

作者： Chuantian Zuo Liguo Tan Hua Dong Jiangzhao Chen Feng Hao Chenyi Yi Liming Ding Center for Excellence in Nanoscience (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and Technology Beijing 100190 China Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China School of Electronic Science and Engineering Xi'an Jiaotong University Xi'an 710049 China College of Optoelectronic Engineering Chongqing University Chongqing 400044 China School of Materials and Energy University of Electronic Science and Technology of China Chengdu 610054 China

Natural drying (without spin coating or assistance of antisolvent, gas, or vacuum) might be the least-cost drying method to make perovskite films for solar cells. However, perovskite films made without quenching generally show undesirable morphology and low photovoltaic performance. In this work, we developed a high-throughput screening method to find the perovskite compositions that can form high-quality film without quenching process. We found that composition-graded perovskite films can be easily made by using a solution interdiffusion process, which produces perovskite films with continuously changing composition and the resulting film morphology, enabling fast screening of desired perovskite compositions. Several perovskites (CsPbI 2 Br, FA 0.4 Cs 0.6 PbI 3 , FA 0.2 MA 0.8 PbI 3 , and FA 0.95 Cs 0.05 PbI 3 ) which can form high-quality films without quenching were successfully found. FA 0.95 Cs 0.05 PbI 3 films yield a PCE of 23.28%, which is the highest PCE for perovskite solar cells with naturally-dried perovskite layer.

关键词： High-throughput screening Self-spreading Interdiffusion Graded composition Perovskite solar cells

来源：评论

学校读者我要写书评

暂无评论

"what We Breathe Impacts Our Health: Improving Understanding of the Link between Air Pollution and Health"

"what We Breathe Impacts Our Health: Improving Understanding...

引用

作者： West, J. Jason Cohen, Aaron Dentener, Frank Brunekreef, Bert Zhu, Tong Armstrong, Ben Bell, Michelle L. Brauer, Michael Carmichael, Gregory Costa, Dan L. Dockery, Douglas W. Kleeman, Michael Krzyzanowski, Michal Künzli, Nino Liousse, Catherine Lung, Shih-Chun Candice Martin, Randall V. Pöschl, Ulrich Pope, C. Arden Roberts, James M. Russell, Armistead G. Wiedinmyer, Christine Environmental Sciences and Engineering University of North Carolina at Chapel Hill Chapel HillNC27599 United States Health Effects Institute BostonMA02110 United States European Commission Joint Research Centre Institute for Environment and Sustainability IspraI. 21027 Italy Institute for Risk Assessment Sciences Universiteit Utrecht Julius Center for Health Sciences and Primary Care University Medical Center Utrecht Utrecht3584 CJ Netherlands State Key Lab for Environmental Simulation and Pollution Control College of Environmental Science and Engineering Peking University Beijing100871 China Social and Environmental Health Research London School of Hygiene and Tropical Medicine LondonWC1E 7HT United Kingdom School of Forestry and Environmental Studies Yale University New HavenCT06511 United States School of Population and Public Health University of British Columbia VancouverBCV6T 1Z3 Canada Chemical and Biochemical Engineering University of Iowa Iowa CityIA52242 United States Air Climate and Energy Research Program Office of Research and Development Environmental Protection Agency DurhamNC27705 United States Harvard T. H. Chan School of Public Health BostonMA02115 United States Civil and Environmental Engineering University of California at Davis DavisCA95616 United States Environmental Research Group King's College London LondonSE1 9NH United Kingdom Epidemiology and Public Health Swiss Tropical and Public Health Institute Basel Switzerland University of Basel Basel Switzerland Laboratoire d' Aérologie CNRS-Université de Toulouse Toulouse31400 France Research Center for Environmental Changes Academia Sinica Taipei Taiwan Physics and Atmospheric Science Dalhousie University HalifaxNSB3H 4R2 Canada Harvard-Smithsonian Center for Astrophysics CambridgeMA02138 United States Multiphase Chemistry Department Max Planck Institute for Chemistry Mainz55128 Germany Economics Brigham Young University ProvoUT84602 United States Ea

Air pollution contributes to the premature deaths of millions of people each year around the world, and air quality problems are growing in many developing nations. While past policy efforts have succeeded in reducing particulate matter and trace gases in North America and Europe, adverse health effects are found at even these lower levels of air pollution. Future policy actions will benefit from improved understanding of the interactions and health effects of different chemical species and source categories. Achieving this new understanding requires air pollution scientists and engineers to work increasingly closely with health scientists. In particular, research is needed to better understand the chemical and physical properties of complex air pollutant mixtures, and to use new observations provided by satellites, advanced in situ measurement techniques, and distributed micro monitoring networks, coupled with models, to better characterize air pollution exposure for epidemiological and toxicological research, and to better quantify the effects of specific source sectors and mitigation strategies. © 2016 American Chemical Society.

关键词： Health

来源：评论

学校读者我要写书评

暂无评论

Prepared [email protected] hollow carbon sphere adsorbents with lappaceum shell like structure for high efficiency removal of hexavalent chromium

引用

Chemosphere 2021年 263卷

作者： Fei Wang Yimei Zhang Qinglu Fang Zhiying Li Yuxian Lai Hangsheng Yang Laboratory of Environment Remediation and Function Material Suzhou Research Institute of North China Electric Power University Suzhou Jiangsu 215213 China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering North China Electric Power University Beijing 102206 China

Herein, the novel [email protected] hollow carbon sphere ( [email protected] ) adsorbents with different mass of NHCS were prepared by in-situ polymerization method. The microstructure of obtained [email protected] , [email protected] , [email protected] and [email protected] samples were observed through both scanning electron microscopy (SEM) and transmission electron microscopy (TEM), which showed that the [email protected] possessed hollow structure like lappaceum shell. Then, the performance of obtained [email protected] was studied for removing hexavalent chromium (Cr(VI)) from waste water. With the help of unique hollow structure and reduction ability of [email protected] , the Cr(VI) was fleetly adsorbed and then reduced to less toxic Cr(III). The maximum adsorption capacity was 250.0 mg/g for [email protected] under the optimal condition. Moreover, the effects of initial Cr(VI) concentration, solution pH and different ions on the adsorption performance were investigated in detail. Importantly, the [email protected] still shows superb adsorption ability after five cycles, which suggests its satisfactory reusability ability. The accumulated data revealed the crucial role of PANI and hollow structure co-promoting effect on Cr(VI) reduction reactions over [email protected] , which could be applied to the practical use.

关键词： PANI Hollow structure Cr(VI) removal Adsorption Reduction

来源：评论

学校读者我要写书评

暂无评论

Photonic signal processor based on a Kerr microcomb for real-time video image processing

引用

Communications engineering 2023年第1期2卷 94页

作者： Tan, Mengxi Xu, Xingyuan Boes, Andreas Corcoran, Bill Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Wu, Jiayang Mitchell, Arnan Moss, David J. School of Electronic and Information Engineering Beihang University Beijing 100191 China Optical Sciences Centre Swinburne University of Technology Hawthorn 3122 VIC Australia School of Engineering RMIT University Melbourne 3001 VIC Australia State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China Institute for Photonics and Advanced Sensing (IPAS) and School of Electrical and Electronic Engineering University of Adelaide Adelaide 5005 SA Australia Department of Electrical and Computer System Engineering Monash University Clayton 3168 VIC Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Xi’an Institute of Optics and Precision Mechanics of CAS Xi’an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet Varennes Québec J3X 1S2 Canada

Signal processing has become central to many fields, from coherent optical telecommunications, where it is used to compensate signal impairments, to video image processing. Image processing is particularly important for observational astronomy, medical diagnosis, autonomous driving, big data and artificial intelligence. For these applications, signal processing traditionally has mainly been performed electronically. However these, as well as new applications, particularly those involving real time video image processing, are creating unprecedented demand for ultrahigh performance, including high bandwidth and reduced energy consumption. Here, we demonstrate a photonic signal processor operating at 17 Terabits/s and use it to process video image signals in real-time. The system processes 400,000 video signals concurrently, performing 34 functions simultaneously that are key to object edge detection, edge enhancement and motion blur. As compared with spatial-light devices used for image processing, our system is not only ultra-high speed but highly reconfigurable and programable, able to perform many different functions without any change to the physical hardware. Our approach is based on an integrated Kerr soliton crystal microcomb, and opens up new avenues for ultrafast robotic vision and machine learning. © The Author(s) 2023.

关键词： Frequency combs Solitons

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：