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Stable wide-temperature and low volume expansion Al batteries:Integrating few-layer graphene with multifunctional cobalt boride nanocluster as positive electrode

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Nano Research 2020年第2期13卷 419-429页

作者： Li-Li Chen Na Li Huifeng Shi Yuefei Zhang Wei-Li Song Shuqiang Jiao Haosen Chen Daining Fang Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China School of Materials Science&Engineering Beijing Institute of TechnologBeijing 100081China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute of Microstructure and Property of Advarced Materials Beijing University of TechnologyBejing 100124China State Key Laboratory for Turbulence and Complex Systems College of EngineeringPeking UniversityBeijing 100871China

To achieve stable positive electrode for promoting the overall electrochemical performance of Al batteries(ABs),here novel cobalt boride(CoB)nanoclusters are synthesized to construct composite electrodes with few-layer graphene(FLG).Due to the presence of amorphous channels in the employed CoB nanoclusters,the ABs with FLG/CoB composite positive electrodes exhibit high *** and both mechanical and electrochemical stability in the *** assistance of in situ scanning electron microscopy(SEM),the observation results suggest that the positive electrode of CoB nanoclusters holds almost ignorable volume variation upon electrochemical processes,which substantially alleviates the massive electrode expansion induced by the anion intercalation in the composite positive ***,the composite positive electrodes provide stable reversible energy storage capability within a broadened temperature range(-30-60℃),promising a novel strategy to design advanced ABs positive electrodes with enhanced overall energy storage performance.

关键词： Al batteries positive electrode cobalt boride nanoclusters ionic liquid broad temperature

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Characteristics structure analysis on debris cloud in the hypervelocity impact of disk projectile on thin plate

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Defence technology（防务技术） 2020年第2期16卷 299-307页

作者： Chun-bo Zhang De-ning Di Xiao-wei Chen Ken Wen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Institute of Systems Engineering China Academy of Engineering PhysicsMianyangSichuan621999China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China

In this paper,the gauge points setting is introduced in the SPH simulation to analyze the debris cloud structure generated by the hypervelocity impact of disk projectile on thin *** with the experiments,more detailed information of the debris cloud structure can be classified from the numerical ***,due to the solitary dispersion and overlap display of the particles in the SPH simulation,accurate comparison between numerical and experimental results is difficult to be *** track the velocity and spatial distribution of the particles in the debris cloud induced from disk and plate,gauge points are locally set in the single-layer profile in the SPH *** analyzing the gauge points’spatial coordinate and velocity,the location and velocity of characteristic points in the debris cloud are *** boundary of debris cloud is achieved,as well as the fragments distribution outside the main structure of debris cloud.

关键词： Hypervelocity impact Debris cloud SPH method Particle gauge points Motion characteristics

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Oscillation Suppression Method based on Power Control Optimization of the Wind Farms 3

Oscillation Suppression Method based on Power Control Optimi...

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3rd IEEE International Power Electronics and Application Conference and Exposition, PEAC 2022

作者： Yang, Jiaqi Wang, Shaojun Li, Zhen Tian, Xu Liu, Bin Liu, Xiangdong Beijing Institute of Technology School of Automation Beijing China Co.Ltd Bayannur Power Supply Bureau Inner Mongolia China State Key Laboratory for Intelligent Control and Decision of Complex Systems Beijing China Beijing University of Mining and Technology Beijing Electric Engineering and Automation Beijing China Tsinghua University Department of Electrical Engineering Beijing China

ISBN: (数字)9781665491419

ISBN: (纸本)9781665491419

Oscillation issues in the grid-connected wind farm system can severely deteriorate the power system security and lead to serious damage. Based on the impedance analysis method, many oscillation suppression methods have been proposed for reshaping the impedance characteristics of system to avoid the risk of oscillations. However, modifying converters' controllers to reshape the wind turbines (WTs) impedance and usage of additional damping devices for reshaping the grid impedance both are time-consuming and costly. Therefore, based on the sequence impedance model of the grid-connected wind farm system, this paper proposes a novel oscillation suppression method by optimizing the power control of wind farm. The system stability margin can be improved by modifying the number of online WTs and the output power of each WT to reshape the impedance of wind farm, under the precondition that the output power demand of wind farm is satisfied. Then, the intelligent particle swarm optimization (PSO) algorithm is used to solve the optimization approach to obtain the number of online WTs with optimal stability margin. Finally, the simulation confirms the effectiveness of the proposed oscillation suppression method. © 2022 IEEE.

关键词： System stability

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Quantitative Analysis of Copper-Molybdenum Slurries Based on Pulse Laser of Low Energy

SSRN

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SSRN 2024年

作者： Li, Chen Zhao, Tianwei Ren, Wanzhou Li, Zizhuo College of Mechanical and Electrical Engineering Shaanxi University of Science and Technology Xi’an710021 China College of Mechanical Engineering Xi’an Jiaotong University Xi’an710049 China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong University Xi’an710054 China

In the mining industry, flotation is a crucial step of on-stream slurry processing. Rapid and accurate acquisition of target elemental grades in flotation is essential for assessing flotation efficiency. In this study, a pulse laser of low energy and a micro-spectrometer were used in conjunction with the principle of Laser-induced breakdown spectroscopy (LIBS) to quantify the concentration of copper in 36 slurry samples, which contained mixed copper-molybdenum powder. The spectral features were extracted by peak intensity, full-spectrum fitting, and full-spectrum principal component analysis while preserving the continuum. Prediction models of copper concentration were established by BP-ANN. The results demonstrated that the neural network model based on full-spectrum principal component analysis (PCA) exhibited the most accurate prediction of copper concentration, with a correlation coefficient (R2) of 0.988 and a root mean square error (RMSE) of 0.504. © 2024, The Authors. All rights reserved.

关键词： Principal component analysis

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Automatic phase compensation of a continuous-variable quantum-key-distribution system via deep learning

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Physical Review A 2023年第6期107卷 062614-062614页

作者： Zhe-Kun Zhang Wei-Qi Liu Jin Qi Chen He Peng Huang School of Information Science and Technology Northwest University Xi'an 710127 Shaanxi People's Republic of China Center for Quantum Sensing and Information Processing State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 People's Republic of China

In a practical continuous-variable quantum-key-distribution (CVQKD) system, it is vital to accurately evaluate and then compensate for the phase drifts of the signals, so that the involved system can achieve better performance and stability. In this paper, based on the long short-term memory network (LSTM) model, an automatic phase compensation approach of the CVQKD system is proposed. The LSTM model is first trained to predict the phase drift value of the quantum signal relative to the local oscillator over time. Then, the predicted phase drift value can be used by Alice to reconstruct her data. Finally, Alice and Bob can obtain the raw key, so that the CVQKD system can achieve enhancements in terms of performance and stability. The experimental results indicate that the proposed LSTM-based automatic phase compensation algorithm can accurately predict the phase drift value and perform phase compensation instead of real-time phase drift measurement, which improves the performance of the CVQKD system without requiring any additional quantum resources and extra experimental hardware.

关键词： Quantum communication

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Experimental Demonstration of 16D Voronoi Constellation with Two-Level Coding over 50km Four-Core Fiber

arXiv

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arXiv 2024年

作者： Zhao, Can Chen, Bin Cai, Jiaqi Liang, Zhiwei Lei, Yi Xiong, Junjie Ma, Lin Hu, Daohui Sun, Lin Shen, Gangxiang School of Computer Science and Information Engineering Hefei University of Technology Hefei China School of Electronic and Information Engineering Soochow University Suzhou China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

A 16-dimensional Voronoi constellation concatenated with multilevel coding is experimentally demonstrated over a 50 km four-core fiber transmission system. The proposed scheme reduces the required launch power by 6 dB and provides a 17 dB larger operating range than 16QAM with BICM at the outer HD-FEC BER threshold. © 2024, CC BY-NC-SA.

关键词： Digital television

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Fluidized bed calcination of magnesite and its chemical and morphological changes 13

Fluidized bed calcination of magnesite and its chemical and ...

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13th International Conference on Fluidized Bed technology, CFB 2021

作者： Han, Zhennan Sun, Cong Hao, Wenqian Liu, Xuejing Yue, Junrong Xu, Guangwen Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical Technology Liaoning Shenyang110142 China State Key Laboratory of Multi-Phase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

ISBN: (纸本)9781771368506

In this study, the reaction kinetic of magnesite calcination in air atmospheres was measured in micro fluidized bed reaction analyzer (MFBRA) and TGA. The complete decomposition time of magnesite in TGA is above 4 min at heating rate of 40 oC /min, but it is just a few seconds (3-5 s) in MFBRA above 750 oC. The activation energy measured in MFBRA and TGA are 125 kJ/mol and 236 kJ/mol respectively, showing a good suitability of MFBRA for rapid reaction in fluidized bed at a specific temperature. Besides, a pilot-scale plant with a capacity of 1 kg/h was established to analysis the effect of temperature, particle size and calcination times on the characteristic of magnesite calcination in transport bed. For powder magnesite with particle sizes of 0.05-0.15 mm, it just needs 1.5-2.3 s to complete the calcination reaction as temperature is above 800 oC. However, with the calcination times exceeding 4 times or residence time exceeding 3 seconds, the recrystallization or sintering will lead to a large grain size of MgO crystal and a dense particle structure with a smaller surface area and a low reactivity. © 2021 CFB 2021 - Proceedings of the 13th International Conference on Fluidized Bed technology. All rights reserved.

关键词： Calcination

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Investigation of the Degradation Mechanism of β-Ga2O3 SBD on 5 MeV Proton Irradiation

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IEEE Transactions on Electron Devices 2025年第7期72卷 3509-3515页

作者： Wenzhang Du Yuangang Wang Yukai Huang Junyan Zhu Junfeng Yu Xiaodong Yang Haonan Liu Xinbo Zou Hongping Ma Qingchun Zhang Liang Li Debin Zhang Yiwu Qiu Xinjie Zhou Tao Wang Zhihong Feng Wei Huang D. W. Zhang State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics and Systems College of Integrated Circuits and Micro-Nano Electronics Fudan University Shanghai China National Key Laboratory of Solid-State Microwave Devices and Circuits Shijiazhuang China School of Information Science and Technology (SIST) ShanghaiTech University Shanghai China School of Academy for Engineering and Technology Fudan University Shanghai China School of Electronic Information Engineering Suzhou Vocational University Suzhou China Shanghai Institute of Space Power-Sources Shanghai China Wuxi Microelectronics Scientific and Research Center Wuxi China School of Integrated Circuits Jiangnan University Wuxi China

The effects of 5 MeV proton irradiation on the electrical performance of $\beta $ -Ga2O3 Schottky barrier diodes (SBDs) are studied in this article to demonstrate the degradation mechanism and behavior related to defects and energy band. After proton irradiation with a fluence of $1\times 10^{{13}}$ n/cm2, the forward current density of $\beta $ -Ga2O3 SBD decreases, the barrier height rises by 0.2 eV, and the ideality factor degenerates from 1.056 to 1.092. The carrier concentration in the epilayer (from $1.05\times 10^{{16}}$ to $0.3\times 10^{{16}}$ $\text{cm}^{-{3}}$ ), obtained from C–V characteristics, notably reduces due to trap states in the drift layer, leading to a higher barrier height. On the other hand, the Poole-Frenkel emission (PFE) mechanism is found to cause the reverse leakage of $\beta $ -Ga2O3 SBD after proton irradiation, utilizing temperature-dependent current-voltage I–V measurements. The deep-level transient spectroscopy (DLTS) measurements further reveal that ${E}_{c}$ -0.82 eV (shifted to ${E}_{c}$ -0.81 eV) originates from preexisting defects, while ${E}_{c}$ -0.72 eV and ${E}_{c}$ -1.04 eV are newly introduced by the proton irradiation. The relatively shallow trap states ${E}_{c}$ -0.72 eV with a large capture cross section ( $2.25\times 10^{-{12}}$ $\text{cm}^{-{2}}$ ) contribute to PFE and dominate the trap-assisted leakage. Finally, the lower trap activation energy (from 0.82 to 0.72 eV) and higher Schottky barrier height (from 0.90 to 1.18 eV) both result in the degradation of both forward conduction and reverse leakage in $\beta $ -Ga2O3 SBDs.

关键词： Protons Radiation effects Schottky barriers Leakage currents Degradation Atoms Temperature measurement Substrates Dielectric constant Current density

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A holistic picture of the carbon emission responsibility in China's aluminium supply chain: Production-side flow analyses, consumption-side responsibility allocation, and driving factor analysis

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Energy 2025年 327卷

作者： Fu, Yuning Yang, Honghua Yang, Xingyuan Arras, Maximilian Chong, Chin Hao Ma, Linwei Li, Zheng State Key Laboratory of Power Systems Department of Energy and Power Engineering Tsinghua University Beijing100084 China Tsinghua-Rio Tinto Joint Research Centre for Resources Energy and Sustainable Development Laboratory for Low Carbon Energy Tsinghua University Beijing100084 China China Electric Power Research Institute State Grid Corporation of China Beijing100192 China School of Management Guilin University of Aerospace Technology Guilin541004 China

As a highly electrified industry with increasing demand, decarbonization in the aluminium smelting and processing industry (ASPI) involves critical aspects such as production-side energy structure and consumption-side material conservation, necessitating a collective strategy. However, the disjointed approaches of these sides hinder a holistic view for policy design. This study developed a comprehensive method to clarify carbon emission responsibilities for ASPI's production and consumption, which traces the emission allocation chain from bauxite supply, aluminium smelting, aluminium consumption to final demand by integrating material-energy-carbon flow analysis with the extended input-output method;and further decomposes the emission contributions of economic, material, and energy factors. The method's application on China reveals that from 2008 to 2020, CO2 emissions of China's ASPI increased from 267 Mt to 538 Mt. The sustained final economic demand growth significantly contributed to this rise, while the impact of suppression factors, including unit energy consumption, was limited. In 2020, investment drove 56.1 % of ASPI's emissions, leading the buildings and infrastructure sector to be responsible for 40.2 % of embodied consumption emission responsibility. This study recommends that China's ASPI focus on revitalizing existing idle assets while balancing new investments;and encourage the inclusion of distributed generation to break the path dependency on coal-fired power. © 2025 Elsevier Ltd

关键词： Aluminum plants

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Dual-channel quantum meta-hologram for display

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Advanced Photonics Nexus 2024年第1期3卷 86-92页

作者： Yubin Fan Hong Liang Yuhan Wang Shufan Chen Fangxing Lai Mu Ku Chen Shumin Xiao Jensen Li Din Ping Tsai City University of Hong Kong Department of Electrical EngineeringHong KongChina City University of Hong Kong Centre for BiosystemsNeuroscienceand NanotechnologyHong KongChina City University of Hong Kong The State Key Laboratory of Terahertz and Millimeter WavesHong KongChina The Hong Kong University of Science and Technology Department of PhysicsHong KongChina The Hong Kong University of Science and Technology IAS Center for Quantum TechnologiesHong KongChina Harbin Institute of Technology(Shenzhen) Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemGuangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsShenzhenChina Pengcheng Laboratory ShenzhenChina

Quantum technologies rely on creating and manipulating entangled sources,which are essential for quantum information,communication,and *** integrating quantum technologies and all-dielectric metasurfaces,the performance of miniature display devices can be enhanced to a higher *** display technology,such as virtual reality display,has achieved original commercial success,and was initially applied to immersive games and interactive *** the consumer market has quickly adopted this technology,several areas remain for improvement,including concerns around bulkiness,dual-channel display,and noise ***,we experimentally realize a quantum meta-hologram concept demonstration of a miniature *** fabricate an ultracompact meta-hologram based on 1μm thick titanium dioxide(TiO_(2)).The meta-hologram can be remotely switched with heralding technique and is robust against noise with the quantum entangled *** platform can alter the miniature display channel by manipulating heralding photons’polarization,removing speckles and multiple reflective light noise,improving imaging contrast,and potentially decreasing device *** contrast increases from 0.36 dB under speckle noise influences to 6.8 dB in quantum correlation *** approach has the potential to miniaturize quantum displays and quantum communication devices.

关键词： quantum meta-hologram display metasurface dual channel

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