检索结果-内蒙古大学图书馆

Acta Mechanica Sinica 2023年第4期39卷 184-194页

作者：黄鹏陈宽宇彭怀午 Hsu-Chew Lee 史一蓬肖左利陈十一万敏平 Guangdong Provincial Key Laboratory of Turbulence Research and Applications Department of Mechanics and Aerospace EngineeringSouthern University of Science and TechnologyShenzhen518055China Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications Southern University of Science and TechnologyShenzhen518055China State Key Laboratory for Turbulence and Complex System College of EngineeringPeking UniversityBeijing100871China Northwest Survey and Design Research Institute Xi’an710065China Eastern Institute for Advanced Study Ningbo315200China

本文采用约束大涡模拟(C-LES)模型来模拟湍流中的被动标量.通过施加一个基于被动标量大涡模拟(LES)中标量方差通量标度不变量的物理约束来计算动态混合非线性模型(MNLM)的系数.将约束亚格子(SGS)模型与不同的SGS模型在不可压各向同性湍... 详细信息

本文采用约束大涡模拟(C-LES)模型来模拟湍流中的被动标量.通过施加一个基于被动标量大涡模拟(LES)中标量方差通量标度不变量的物理约束来计算动态混合非线性模型(MNLM)的系数.将约束亚格子(SGS)模型与不同的SGS模型在不可压各向同性湍流被动标量中进行比较.此外,C-LES模型减少了SGS标量方差通量在惯性-对流尺度以及较大的黏性-扩散尺度上的变化.先验测试表明,C-LES模型在预测SGS标量通量的方向和大小方面表现最好.此外,C-LES模型减少了SGS标量方差通量在惯性-对流范围内以及粘性-扩散范围内大尺度的变化.在后验测试中,与传统的动态Smagorinsky(DSM)和MNLM模型相比,C-LES模型在预测标量谱和内部间歇性的演变中表现明显更好.这些结果表明,在SGS模型中施加物理约束是在被动标量湍流大涡模拟中的一种有前途的方法.

关键词： SGS模型亚格子模型 LES模型各向同性湍流物理约束扩散范围非线性模型动态混合

来源：评论

学校读者我要写书评

暂无评论

Recent Advances of Monolithic All-Perovskite Tandem Solar Cells:From Materials to Devices

引用

Chinese Journal of Chemistry 2022年第7期40卷 856-871页

作者： Shan Jiang Yiming Bai Zongwen Ma Shengli Jin Chao Zou Zhao'ao Tan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Solar Energy Utilization&Energy Saving Technology of Zhejiang Province Zhejiang Energy Group R&D Institute Co.Ltd.HangzhouZhejiang 311121China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhouZhejiang 325027China

Organic-inorganic metal-halide perovskite solar cells(PerSCs)have achieved significant progresses due to their outstanding optoelectronic charac-teristics,and the power conversion efficiency(PCE)of single-junction PerSCs has been boosted from 3.8%to a certified 25.2%.However,the efficien-cy of single-junction cells is governed by the Shockley-Queisser(S-Q)radiative limit,and fabricating all-perovskite tandem solar cells is a particularly attractive method to break the S-Q *** the bandgap of lead(Pb)-based mixed halide perovskite can be tuned from 1.55 eV to 2.3 eV,and the mixed tin(Sn)-Pb perovskites have bandgap of~1.2 eV,these perovskites become the best candidates for the front and rear subcells of all-perovskite tandem device,*** this review,we firstly summarize the current development progresses of two-terminal(2-T)all-perovskite tandem so-lar *** further optimizing the device performance,the wide bandgap mixed halide perovskites for front subcell,mixed Sn-Pb narrow bandgap perovskites for rear subcell,and the interconnection layer(ICL)of 2-T tandem device are then *** review aims to open a pathway to real-ize highly efficient all-perovskite tandem solar cells.

关键词： Perovskite phase Tandem solar cells Interconnection layer Energy conversion Complementary absorption

来源：评论

学校读者我要写书评

暂无评论

Electrically programmable phase-change photonic memory for optical neural networks with nanoseconds in situ training capability

引用

Advanced Photonics 2023年第4期5卷 42-50页

作者： Maoliang Wei Junying Li Zequn Chen Bo Tang Zhiqi Jia Peng Zhang Kunhao Lei Kai Xu Jianghong Wu Chuyu Zhong Hui Ma Yuting Ye Jialing Jian Chunlei Sun Ruonan Liu Ying Sun Wei.E.I.Sha Xiaoyong Hu Jianyi Yang Lan Li Hongtao Lin Zhejiang University College of Information Science and Electronic EngineeringState Key Laboratory of Modern Optical InstrumentationKey Laboratory of Micro-Nano Electronics and Smart System of Zhejiang ProvinceHangzhouChina Westlake University School of EngineeringKey Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang ProvinceHangzhouChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhouChina Institute of Microelectronics of the Chinese Academy of Sciences BeijingChina Peking University School of PhysicsFrontiers Science Center for Nano-optoelectronicsState Key Laboratory for Mesoscopic PhysicsBeijingChina

Optical neural networks (ONNs), enabling low latency and high parallel data processing withoutelectromagnetic interference, have become a viable player for fast and energy-efficient processing andcalculation to meet the increasing demand for hash rate. Photonic memories employing nonvolatile phase-change materials could achieve zero static power consumption, low thermal cross talk, large-scale, andhigh-energy-efficient photonic neural networks. Nevertheless, the switching speed and dynamic energyconsumption of phase-change material-based photonic memories make them inapplicable for in situ ***, by integrating a patch of phase change thin film with a PIN-diode-embedded microring resonator,a bifunctional photonic memory enabling both 5-bit storage and nanoseconds volatile modulation wasdemonstrated. For the first time, a concept is presented for electrically programmable phase-changematerial-driven photonic memory integrated with nanosecond modulation to allow fast in situ training and zerostatic power consumption data processing in ONNs. ONNs with an optical convolution kernel constructedby our photonic memory theoretically achieved an accuracy of predictions higher than 95% when testedby the MNIST handwritten digit database. This provides a feasible solution to constructing large-scalenonvolatile ONNs with high-speed in situ training capability.

关键词： phase-change materials optical neural networks photonic memory silicon photonics reconfigurable photonics

来源：评论

学校读者我要写书评

暂无评论

Erratum to: A justice and innovative way ahead of consumption-based emission accounting approach

引用

Science China Earth Sciences 2024年第10期67卷 3337-3338页

作者： Qun SHEN Hongbo DUAN Yun TANG Linbing TANG Li SHANG Xinyu DOU Wei WEI Weiqiang CHEN Zhu LIU State Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization CAS Key Laboratory of Low-Carbon Conversion Science&EngineeringShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China School of Economics&Management University of Chinese Academy of SciencesBeijing 100190China Key Lab of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Department of Earth System Science Tsinghua UniversityBeijing 100084China

The article“A justice and innovative way ahead of consumption-based emission accounting approach”(Sci China Earth Sci,2024,67:2999–3010)contained *** corrections in an erratum do not change or affect the result or ... 详细信息

关键词： Earth approach correction

来源：评论

学校读者我要写书评

暂无评论

Research on Comprehensive Assessment Method of Battery Consistency Based on Scaled Energy Storage Power Station

Research on Comprehensive Assessment Method of Battery Consi...

引用

Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Kepaiyitulla Tursun Ming Li Yunping Zheng Sijia Zong Xingyan Luo Shangxing Wang Xiangjun Li Xinjiang Key Laboratory of Whole Process Simulation for Power System State Grid Xinjiang Electric Power Research Institute Urumqi China State Key Laboratory of Operation ad Control of Renewable Energy and Storage systems China Electric Power Research Istitute Beijing China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

In the long-term operation of a megawatt-scale energy storage plant composed of series-parallel connections, the single batteries will have different degrees of inconsistency problems. To solve this problem, this paper proposes a comprehensive assessment method based on the consistency of batteries in scaled energy storage power stations. According to the consistency indexes such as single battery voltage and voltage polarity difference in series connection between modules, the consistency evaluation criterion of battery monomer was established. Based on the historical data of a battery energy storage system, the consistency evaluation criterion of a single battery is used to analyze the consistency of a single battery of an energy storage power station at different charging and discharging stages. The results show that this method can accurately assess cell consistency. It provides data support for the health status assessment of energy storage plants and reduces the systematic operational risk of energy storage plants.

关键词： Electrical engineering systematics Battery energy storage system Asia Voltage Hazards Batteries

来源：评论

学校读者我要写书评

暂无评论

Development of lunar regolith composite and structure via laser-assisted sintering

引用

Frontiers of Mechanical engineering 2022年第1期17卷 178-187页

作者： Hua ZHAO Lu MENG Shaoying LI Jihong ZHU Shangqin YUAN Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Beijing Institute of Radio Measurement Beijing 100854China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi'an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

Aiming at the exploration and resource utilization activities on the Moon,in situ resource utilization and in situ manufacturing are proposed to minimize the dependence on the ground transportation *** this paper,a laser-assisted additive manufacturing process is developed to fabricate lunar regolith composites with PA12/SiO2 mixing *** process parameters and composite material compositions are optimized in an appropriate range through orthogonal experiments to establish the relationship of process–structure–property for lunar regolith *** optimal combination of composite material compositions and process parameters are mixing ratio of 50/50 in volume,laser power of 30 W,scanning speed of 3500 mm/s,and scanning hatch space of 0.2 *** maximum tensile strength of lunar regolith composites reaches 9.248 MPa,and the maximum depth of surface variation is 120.79μm,which indicates poor powder fusion and sintering ***,the mechanical properties of laser-sintered lunar regolith composites are implemented to the topology optimization design of complex *** effectiveness and the feasibility of this laser-assisted process are potentially developed for future lightweight design and manufacturing of the solar panel installed on the lunar rover.

关键词： in situ manufacturing laser-assisted powder fusion process mechanical properties topological structure design

来源：评论

学校读者我要写书评

暂无评论

Tightly-Coupled Visual-DVL Fusion For Accurate Localization of Underwater Robots

Tightly-Coupled Visual-DVL Fusion For Accurate Localization ...

引用

IEEE/RSJ International Conference on Intelligent Robots and systems (IROS)

作者： Yupei Huang Peng Li Shuaizheng Yan Yaming Ou Zhengxing Wu Min Tan Junzhi Yu Laboratory of Cognitive and Decision Intelligence for Complex System Institute of Automation Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Department of Mechanics and Engineering Science State Key Laboratory for Turbulence and Complex Systems BIC-ESAT College of Engineering Peking University Beijing China

This paper proposes a tightly-coupled visual-Doppler-Velocity-Log (visual-DVL) fusion method for underwater robot localization through integrating the velocity measurements from a DVL into a visual odometry (VO). Considering that employing the DVL measurements in dead-reckoning systems easily leads to error accumulation and suboptimal results in previous works, we directly integrate them into the visual tracking process. Specifically, the velocity measurements are utilized to improve the initial estimation of camera pose during visual tracking, aiming to provide a better initial value for pose optimization. Thereafter, these velocity measurements are also directly employed to constrain the position change of the camera between two adjacent frames by constructing a novel DVL error term, which is optimized jointly with the visual constrains to obtain a more accurate camera pose. Various experiments are carried out in the datasets collected from several scenarios of the underwater simulation environment HoloOcean, and the results illustrate that the proposed fusion method can effectively improve the localization accuracy for underwater robots by about 20% compared to pure visual odometry. The proposed method provides valuable guidance for the accurate localization of underwater robots.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Generative Adversarial Network for Generating Time-Frequency Images 2nd

Generative Adversarial Network for Generating Time-Frequency...

引用

2nd EAI International Conference on Artificial Intelligence for Communications and Networks, AICON 2020

作者： Zhu, Weigang Li, Kun Qu, Wei Zhu, Bakun Zhao, Hongyu State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang471003 China Space Engineering University Beijing101416 China

ISBN: (纸本)9783030690656

To deal with the problem of de-noising and enhancement of radar signal time-frequency images, a method of secondary generating time-frequency images by generative adversarial network is proposed. Firstly, time-frequency analysis is used to generate the time-frequency image of the radar signal as the original data set 1. Then, after learning the data set 1 by using the generative adversarial network, a new data set 2 is generated, and the data set 2 has de-noising and enhancement effects relative to data set 1. Finally, the validity of the data set 2 generated by the time-frequency image singular value feature is checked. Experiments on the time-frequency images of five common radar signals are carried out. The results show that the method is effective in time-frequency image de-noising and increasing sample diversity. © 2021, ICST institute for Computer Sciences, Social Informatics and Telecommunications engineering.

关键词： Generative adversarial networks

来源：评论

学校读者我要写书评

暂无评论

Nonvolatile electrically reconfigurable silicon photonics enabled by back-end-of-line integration of phase change materials 12

Nonvolatile electrically reconfigurable silicon photonics en...

引用

Optoelectronic Devices and Integration XII 2023

作者： Li, Junying Wei, Maoliang Xu, Kai Tang, Bo Yun, Yiting Zhang, Peng Wu, Yingchun Bao, Kangjian Lei, Kunhao Chen, Zequn Ma, Hui Sun, Chunlei Liu, Ruonan Li, Ming Li, Lan Lin, Hongtao State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China Institute of Microelectronics of the Chinese Academy of Sciences Beijing100029 China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Zhejiang Hangzhou310030 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China

ISBN: (纸本)9781510667778

Nonvolatile light-field manipulation via electrically-driven phase transition of chalcogenide phase change materials (PCMs) is regarded as one of the most powerful solutions to low-power-consumption and compact integrated reconfigurable photonics. However, before the breakthrough in large-scale integration approaches linked to wafer foundries, phase-change non-volatile reconfigurable photonics could hardly see their widespread practical applications. Here we demonstrate nonvolatile photonic devices fabricated by back-end-of-line (BOEL) integration of PCMs into the commercial silicon photonics platform. A narrow trench etched into the BOEL dielectric layer exposed the waveguide core and allowed for the direct deposition of various PCM films on the waveguide in the functional areas. Fine-tuning the nonvolatile phase transition of Sb2Se3 via a PIN microheater was verified by realizing the post-fabrication trimming of silicon photonic devices. Our work highlights a reliable platform for large-scale PCM-integrated photonics and validates its precise nonvolatile reconfigurability. © 2023 SPIE.

关键词： Phase change materials

来源：评论

学校读者我要写书评

暂无评论

Response Plan for Physical Security of Electric Power Substation 3

Response Plan for Physical Security of Electric Power Substa...

引用

2023 3rd International Conference on Big Data, Artificial Intelligence and Risk Management, ICBAR 2023

作者： Mahato, Nawaraj Kumar Yang, Jiaxuan Sun, Yue Zhang, Shuai Gong, Gangjun Hao, Jianhong Beijing Engineering Research Center of Energy Electric Power Information Security North China Electric Power University Beijing China State Grid Jibei Electric Power Co. Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Beijing China State Key Laboratory of New Energy Power System North China Electric Power University Beijing China

ISBN: (纸本)9798400716478

Electric power substations are increasingly vulnerable to physical attacks, which can cause significant energy and economic losses. To mitigate these risks, utilities should develop and implement a comprehensive response plan which is discussed in this paper. This plan should include prevention, detection, response, and implementation phases. Prevention measures include physical security measures, access control measures, and intrusion detection and prevention systems. Detection methods include motion sensors, vibration sensors, and video surveillance. Response measures include communication plans, evacuation plans, neutralization plans, and recovery plans. Implementation includes developing the plan, training personnel, and testing the plan. Further, this paper also proposes an immediate response and action plan within 60 minutes of a successful attack on an electric power substation. All these measures will ensure security and strengthen the reliability of the power grid. © 2023 ACM.

关键词： Access control

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：