检索结果-内蒙古大学图书馆

A Successive "Conversion-Deposition" Mechanism Achieved by Micro-Crystalline Cu2O Modified Current Collector for Composite Lithium Anode

学校读者我要写书评

暂无评论

SSRN 2022年

作者： Cai, Yifei Qin, Bin Li, Chun Si, Xiaoqing Cao, Jian Zheng, Xiaohang Qiao, Liang Qi, Junlei State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Key Laboratory of Materials Design and Quantum Simulation College of Science Changchun University Changchun130022 China

Lithium (Li) metal is a promising material for high-energy-density batteries, but it is still plagued by obvious capacity degradation and low average Coulombic efficiency resulting from dendrite Li propagation. One main reason is the electro-mechanic coupled failure of plated Li on the current collector, which contributes to non-dense Li deposition on the anode. Transition metal oxides (TMOs) with a conversion-type mechanism have been used directly as the anode materials for lithium ion batteries, which demonstrated better electro-mechanical stability than metal Li. Herein, a successive ''conversion-deposition'' mechanism is ingeniously developed to restrain the generation of dendritic Li. Specifically, a micro-crystalline Cu2O modified current collector was prepared, in which Li+ are sequentially inserted into Cu2O and deposited in the form of Li metal at successive low potential. A Li-Cu half-cell based on the hybrid mechanism sustains a high Coulombic efficiency of over 99.3% in up to 800 cycles. This work ingeniously inhibits the generation of dendrite Li by incorporating conversion-type materials with deposition-dissolution type metal Li, which contributes to a novel concept for the design of functional current collectors for composite Li anodes. © 2022, The Authors. All rights reserved.

关键词： Copper oxides

Research on simulation Modeling Method of New Distributing Network with Large Scale Distributed Energy Sources

学校读者我要写书评

暂无评论

Research on Simulation Modeling Method of New Distributing N...

International Conference on Power System technology (POWERCON)

作者： Huaiguang Gu Longze Kou Lin Zhu Yuqin Gao Yang Gao Ping Xiong State Key Laboratory of Advanced Transmission Technology Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. LTD. Changping Beijing China State Grid Hubei Electric Power Research Institute Hongshan District Wuhan City Hubei Province China

In this paper, a distribution network model with distributed power supply is built. Firstly, the current situation of new energy power generation under the background of carbon neutralization is introduced in the overview. The models of fans, photovoltaic and hybrid energy storage are established respectively, and the corresponding control methods such as maximum power tracking, constant power control, bus voltage control and so on are described in detail. On this basis, the distribution network modeling of photovoltaic energy storage intermodal transportation is completed; Each simulation model is shown.

关键词：

Organic–Inorganic Hybrid Perovskite Scintillator for High-Resolution X-Ray Imaging

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Yan, Weipeng Duan, Baojun Zhu, Zijian Song, Yan Song, Guzhou Ma, Jiming Li, Binkang Liu, Yucheng State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an710119 China

Herein, Lithium-doped 2D (PEA)2PbBr4 ((PEA)2PbBr4:Li) perovskite single crystals (SCs) synthesized at room temperature are reported, and their scintillation properties are analyzed and compared with those of LYSO:Ce crystals under X-ray excitation. The (PEA)2PbBr4:Li SCs exhibit a fast time response with two decay times (11 ns (85%) and 38 ns (15%)), and the main fast-decay time is significantly shorter than that of LYSO:Ce (42 ns). The (PEA)2PbBr4:Li SCs exhibit a bright blue emission peaking at 428 nm and a narrow radioluminescence spectrum. Further, the (PEA)2PbBr4:Li SCs exhibit a high light yield (approximately 23 300 photons/MeV). In addition, the (PEA)2PbBr4:Li SCs exhibit better spatial resolution (3.3 lp/mm at modulation transfer function = 0.1) in X-ray imaging. The results demonstrate that the low-cost (PEA)2PbBr4:Li SCs scintillator has enormous potential for medical diagnostic applications. © 2023, The Authors. All rights reserved.

关键词： Lithium

Mode I Fracture Analysis of Adhesively Bonded Bi-Material Dcb Joints

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Wang, Wandong Zhang, Shijie Chen, Guiyong Zhu, Yangxuan Zhao, Tian School of Civil Aviation Northwestern Polytechnical University Shaanxi Xi’an710072 China Co. Ltd 610000 China Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics School of Science Wuhan University of Technology Wuhan430070 China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Institute of Advanced Structure Technology Beijing Institute of Technology Beijing100081 China

There has been a disputation about how to design bi-material double cantilever beam (DCB) joints to measure pure mode I fracture toughness. This paper develops a theoretical frame to calculate the stresses in the adhesive layer and perform the data reduction and mode partitioning for generic bi-material DCB specimens. The theoretical model was validated using experimental data and conventional finite element method. The prediction results substantiate that the strain-based design strategy leads to a pure mode I fracture of the bi-material DCB joints. The proposed theoretical method can promote the application of strain-based criterion for designing the adhesively bonded bi-material DCB joints to appropriately obtain the pure mode I critical fracture toughness. © 2023, The Authors. All rights reserved.

关键词： Adhesives

Unsupervised Deep Learning Method for Single Image Super-Resolution of the Thick Pinhole Imaging System Using Deep Image Prior

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Li, Guoguang Sheng, Liang Duan, Baojun Li, Yang Hei, Dongwei Xing, Qingzi Ministry of Education Beijing100084 China Laboratory for Advanced Radiation Sources and Application Tsinghua University Beijing100084 China Department of Engineering Physics Tsinghua University Beijing100084 China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China

Thick pinhole imaging system is widely used for diagnosing intense pulsed radiation sources. However, owing to the trade-off among spatial resolution, field of view (FOV) and detection efficiency, the imaging system normally falls short in achieving high-precision spatial diagnosis. In this study, we propose an unsupervised deep learning method for single image super-resolution (SISR) of the thick pinhole imaging system. The point spread function (PSF) of the imaging system is obtained by analytical calculation and Monte Carlo simulation methods, and the mathematical model of the imaging system is established using a linear equation. To solve the ill-posed inverse problem, we adopt randomly initialized deep convolutional neural networks (DCNNs) as an image prior without pre-training, which is named deep image prior (DIP). The results demonstrate that, by utilizing the super-resolution technology to increase the number of pixels in reconstructed images, the proposed DIP algorithm can mitigate the spatial resolution degradation caused by an insufficient spatial sampling frequency of the camera. Compared with the traditional expectation-maximization (EM) algorithm, the proposed DIP algorithm exhibits superior capabilities in recovering high-frequency signals and suppressing ringing artifacts. Furthermore, the robustness of the proposed DIP algorithm under different yields is also verified. © 2024, The Authors. All rights reserved.

关键词： Optical transfer function

Observation of molecular and polymeric nitrogen stuffed NaCl ionic layers

学校读者我要写书评

暂无评论

arXiv

arXiv 2025年

作者： Ning, Ping Tian, Yifan Liu, Guangtao Wang, Hongbo Hu, Qingyang Liu, Hanyu Zhou, Mi Ma, Yanming Key Laboratory of Material Simulation Methods and Software Ministry of Education College of Physics Jilin University Changchun130012 China State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China International Center of Future Science Jilin University Changchun130012 China

Sodium chloride (NaCl), a ubiquitous and chemically stable compound, has been considered inert under ambient conditions. Its typical B1 structure is highly isotropic without preferential direction, favoring the growth of a three-dimensional network of strong Na-Cl ionic bonds. Here, we employ first-principles structural searching and synchrotron X-ray diffraction to unravel an unexpected chemical reaction between NaCl and N2 to produce a hybrid salt-NaCl(N2)2, where N2 molecules break the isotropic NaCl structure into two-dimensional layers upon synthesis at 50 GPa. In contrast to the insulating properties of pristine NaCl, the electronic bandgap of the N2-stuffed NaCl narrowed to 1.8 eV, becoming an indirect bandgap semiconductor. Further compression to 130 GPa induced the polymerization of N atoms into zigzag N-chains. Our findings not only demonstrate the possibility of unusual N-chemistry under extreme conditions, but also suggest a feasible approach for the design of layered NaCl frameworks to modulate the polymerization of nitrogen. Copyright © 2025, The Authors. All rights reserved.

关键词： Sodium chloride

Simultaneous Generation of Quantum Frequency Combs across Distinct Modal Families in a Single Silicon Nitride Whispering Gallery Mode Resonator

学校读者我要写书评

暂无评论

arXiv

arXiv 2024年

作者： Ji, Bo Yang, Yongjun Wu, Tengfei Li, Nianqin He, Guangqiang State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Science and Technology on Metrology and Calibration Laboratory Changcheng Institute of Metrology Measurement Aviation Industry Corporation of China Beijing100095 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China

Quantum frequency combs (QFCs) are versatile resources for multi-mode entanglement, such as cluster states, crucial for quantum communication and computation. On-chip whispering gallery mode resonators (WGMRs) can generate these states at ultra-low threshold power. This work demonstrates the simultaneous generation of multiple QFCs using a single on-chip silicon nitride WGMR across distinct modal families. It presents a micro-ring resonator with a radius of 240 µm, capable of supporting four modal families within the 130 to 260 THz frequency range for consistency regulation. The results indicate that, by carefully designing the structure of silicon nitride WGMRs, it is possible to generate quantum entangled frequency combs across distinct modal families simultaneously using monochromatic pump light. It is achieved by modulating the pump mode profiles with a spatial light modulator (SLM) or an on-chip inverse-designed mode converter. This approach offers a simple and low-cost method to achieve higher-density entanglement integration on-chip. Copyright © 2024, The Authors. All rights reserved.

关键词： Silicon nitride

Control design under attacks of multi-agent switched systems via arbitrary switching

学校读者我要写书评

暂无评论

Control design under attacks of multi-agent switched systems...

2022 Chinese Automation Congress, CAC 2022

作者： Li, Zhanjie Ma, Yajing Nanjing University of Posts and Telecommunications Institute of Advanced Technology for Carbon Neutrality Nanjing China Sichuan Xihua University Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology Chengdu China School of Internet of Things Jiangsu Key Laboratory of Broadband Wireless Communication and Internet of Things Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781665465335

In this paper, the consensus control against attacks for a type of nonlinear multi-agent switched systems under arbitrary switching is studied. The attacks corrupt the information data, which cannot be used for the feedback design. Meanwhile, the switching logic is not allowed to be designed. To tackle the complicated effects, some intermediate variables and adaptive laws are introduced to compensate the uncertainties. By constructing a common Lyapunov function, an adaptive protocol is proposed such that the outputs of the agents achieve consensus against attacks under arbitrary switching. © 2022 IEEE.

关键词： Multi agent systems

Thermal Management of Turbine Disc Cavity System Using Ffbpnn and Nsga Ii Algorithm

学校读者我要写书评

暂无评论

SSRN 2024年

作者： He, Zhenzong Zuo, Min Liang, Shuang Mao, Junkui College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Collaborative Innovation Center for Advanced Aero-Engine Beijing100191 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China

This study addresses the thermal management of the turbine disc cavity system (TDCS) by combining the feed-forward backward propagation neural network (FFBPNN) with the non-dominated sorting genetic algorithm II (NSGA II). First, the heat transfer analysis of the TDCS is carried out using the 1D fluid network method and the 2D finite element method. The impact of different cooling air inlet conditions on the heat transfer performance of the TDCS is investigated. The results show that changing the inlet pressure and temperature significantly affects the heat transfer performance of the TDCS, and the TDCS temperature field can be regulated by the inlet parameters. Then, the prediction model based on the FFBPNN is established to predict the heat transfer performance of the TDCS, and satisfactory result is obtained with mean relative error lower than 1.5% and a coefficient of determination higher than 0.998. Finally, the NSGA II is employed to optimize the cool air inlet condition to achieve thermal management of the TDCS. The Pareto solution set and the optimal solution are obtained. The results indicate that the most comprehensive improvement in the heat transfer performance of the TDCS can be achieved by the present technology. © 2024, The Authors. All rights reserved.

关键词： Temperature control