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Surface defect engineered-Mg-based implants enable the dual functions of superhydrophobic and synergetic photothermal/chemodynamic therapy

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Bioactive Materials 2023年第12期30卷 15-28页

作者： Dongdong Zhang Ru Xu Shuhan Chen Huihui Du Shi Qian Feng Peng Xuanyong Liu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma The University of Hong Kong Shenzhen HospitalShenzhenChina Center for Human Tissues and Organs Degeneration Shenzhen Institutes of Advanced TechnologyChinese Academy of ScienceShenzhen518055PR China Medical Research Institute Department of OrthopedicsGuangdong Provincial People’s Hospital(Guangdong Academy of Medical Sciences)Southern MedicalUniversityGuangzhou510080China GuangDong Engineering Technology Research Center of Functional Repair of Bone Defects and Biomaterials Guangzhou510080China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-lane XiangshanHangzhou310024China

Promoting metallic magnesium(Mg)-based implants to treat bone diseases in clinics,such as osteosarcoma and bacterial infection,remains a challenging ***,an iron hydroxide-based composite coating with a twostage nanosheet-like structure was fabricated on Mg alloy,and this was followed by a thermal reduction treatment to break some of the surface Fe–OH *** coating demonstrated three positive changes in properties due to the ***,the removal of–OH made the coating superhydrophobic,and it had self-cleaning and antifouling *** is beneficial for keeping the implants clean and for anti-corrosion before implantation into the human ***,the superhydrophobicity could be removed by immersing the implant in a 75%ethanol solution,to further facilitate biological action during ***,the color of the coating changed from yellow to brown-black,leading to an increase in the light absorption,which resulted in an excellent photothermal ***,the defects increased the Fe2+content in the coating and highly improved peroxidase ***,the defect coating exhibited synergistic photothermal/chemodynamic therapeutic effects for bacteria and ***,the coating substantially enhanced the anti-corrosion and biocompatibility of the Mg ***,this study offers a novel multi-functional Mg-based implant for osteosarcoma therapy.

关键词： Magnesium-based implants Surface defects Superhydrophobic Anti-bacterial Anti-tumor

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Extraction of n = 0 pick-up by locked mode detectors based on neural networks in J-TEXT

arXiv

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arXiv 2023年

作者： Shen, Chengshuo Li, Jianchao Ding, Yonghua Dong, Jiaolong Wang, Nengchao Han, Dongliang Mao, Feiyue Li, Da Chen, Zhipeng Yang, Zhoujun Chen, Zhongyong Pan, Yuan International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

Measurement of locked mode (LM) is important for the physical research of Magnetohydrodynamic (MHD) instabilities and plasma disruption. The n = 0 pick-up need to be extracted and subtracted to calculate the amplitude and phase of the LM. A new method to extract this pick-up has been developed by predicting the n = 0 pick-up brn=0 by the LM detectors based on Neural Networks (NNs) in J-TEXT. An approach called Power Multiple Time Scale (PMTS) has been developed with outstanding regressing effect in multiple frequency ranges. Three models have been progressed based on PMTS NNs. PMTS could fit the brn=0 on the LM detectors with little errors both in time domain and frequency domain. The n>0 pick-up brn>0 generated by resonant magnetic perturbations (RMPs) can be obtained after subtracting the extracted brn=0. This new method uses only one LM instead of 4 LM detectors to extract brn=0. Therefore, the distribution of the LM detectors can also be optimized based on this new method. Copyright © 2023, The Authors. All rights reserved.

关键词： Extraction

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Change in elastic properties during room-temperature aging in body-centered cubic Mg-Li and Mg-Li-Al single crystals

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Journal of Materials Science & technology 2022年第14期109卷 49-53页

作者： Ruxia Liu Shota Higashino Koji Hagihara Lianmeng Zhang Tohru Sekino Masakazu Tane SANKEN(The Institute of Scientific and Industrial Research) Osaka University8-1 MihogaokaIbarakiOsaka 567-0047Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Graduate School of Engineering Osaka City University3-3-138 SugimotoOsaka558-8585Japan Department of Physical Science and Engineering Nagoya Institute of TechnologyNagoya 466-8555Japan

Biodegradable materials,with many advantages over conventionally used non-biodegradable materials,have received much attention owing to the elimination of the need for a secondary surgery for the removal of implants after *** with other biodegradable ceramics and/or polymers,Mg alloys are considered to be the most promising biodegradable orthopedic materials because they feature not only high specific strength and compressive yield strength but also a low Young’s modulus,which is comparable to that of human bones(10-30 GPa)[1,2].

关键词： strength aging alloys

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High Energy Density Li-ion Battery by Ultra-thick Dry Coating Cathode

High Energy Density Li-ion Battery by Ultra-thick Dry Coatin...

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Power engineering (ICPE), International Conference on

作者： Fengqian Wang Jun Zhong Jinqiao Du Jie Tian Shun Tang Yuan-Cheng Cao School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China Shenzhen Power Supply Co. Ltd China Southern Power Grid Shenzhen China State Key Laboratory of Advanced Electromagnetic Engineering and echnology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331531140

ISBN: (纸本)9798331531157

In the pursuit of a sustainable future, lithium-ion battery is an indispensable energy storage device in grid-scale energy storage systems. However, the prevalent cathode electrode manufacturing processes encounter obstacles in terms of their environmental harmfulness and costliness, primarily attributed to the toxic solvent desiccation and reclamation stages. Moreover, the reliance on lithium-ion batteries particularly underscores the necessity for augmenting energy density, both in terms of volume and weight, with the cathode as the pivotal factor. Dry electrode fabrication emerges as an economical approach to attain heightened material loadings. Herein, we utilize binder fibrillation method to prepare 5 kinds of thickness cathode, the research shows that the dry electrode exhibits a capacity retention of 51.7%, surpassing the 44.3% retention of the traditional wet-based electrode at a loading of roughly $30 mg \mathbf{c m}^{-2}\left(4 \mathrm{mAh} / \mathrm{cm}^{2}\right)$ and is also capable of performing at ultra-high loadings up to $100 \mathrm{mg} \mathrm{cm}{ }^{-2}$ ($20 \mathrm{mAh} / \mathrm{cm}^{2}$). This exceptional cycling endurance can be attributed to a robust, interconnected binder fiber by air mill and enhanced mechanical attributes.

关键词： Lithium-ion batteries Solvents Power engineering Manufacturing processes Loading Optimization methods Power system stability Optical fiber devices Cathodes Energy storage

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Comprehensive Performance Analysis for Transient Stability Assessment Machine Learning Models Activated by Features in Multi Temporal Sections 4

Comprehensive Performance Analysis for Transient Stability A...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Ren, Junyu Chen, Jinfu Yang, Ruixiong Yang, Yexin Lin, Guihui Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Zhuhai Power Supply Bureau Guangdong Power Grid Co. Ltd Zhuhai China

ISBN: (纸本)9781728171494

To meet the requirement of highly efficient transient stability assessment, we propose a concise but efficient feature set collected from multi temporal sections. Activated by the proposed feature set, some typical machine learning models are constructed and tested respectively on two benchmark systems of different scales. Comprehensive performance analysis of different machine learning models is implemented. The accuracy of most typical models based on the proposed feature set is greater than 98% both for two systems. Further, the interpretability performance is discussed. Rules of stability are very easy to acquire through data propagation in decision tree, showing that the decision tree has a strong interpretability, which is conducive to preventing the system from transient instability. © 2021 IEEE.

关键词： Decision trees

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On the Limit Cycle Caused by Controller Saturation in Synchronous Buck Converter

On the Limit Cycle Caused by Controller Saturation in Synchr...

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International Conference on Power Electronics (ICPE)

作者： A. Ying Xu B. Xuehua Wang C. Yuying He D. Hao Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan P. R. China College of Energy and Electrical Engineering Hohai University Nanjing P. R. China

In the reported instability incidents of power converter-based systems, a constant-amplitude oscillation instead of divergence was often observed, which is the so-called limit cycle phenomenon. This does not agree with theoretical analysis based on classical linear control theory. Taking a synchronous buck converter as an example, this paper aims to investigate the underlying mechanism of the limit cycle phenomenon. It finds that this phenomenon results from the nonlinear controller saturation. To clarify the underlying mechanism, the controller saturation is linearized through the describing function method, then the generalized Nyquist stability criterion is applied. It reveals that the system operation point dynamically drifts and ultimately stays at the critically stable point, featuring the constant-amplitude oscillation. Moreover, the occurrence condition and the calculation of the oscillating amplitude and frequency are also explored. Simulations and experiments verify the correctness of the analysis.

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Design and control of the accelerator grid power supply-conversion system applied to CFETR N-NBI prototype

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Plasma Science and technology 2020年第8期22卷 175-183页

作者： Dongyu WANG Ming ZHANG Shaoxiang MA Shu YANG Kexun YU Yuan PAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

The acceleration grid power supply(AGPS)rated 200 kV/25 A is a key component devoted to supply the acceleration grids of the China fusion engineering test reactor negative-ion-based neutral beam injector(N-NBI)prototype *** paper focused on the design and control of the AGPS conversion system(AGPS-CS),with emphasis on the requirement of the wide range output voltage and rise time.A voltage regulation switch at the front of step-down transformer is applied to optimize the grid current and DC-link ***,a new feedforward control strategy with piecewise PI compensator is proposed to improve the characteristics of *** simulation results of the proposed AGPS-CS are presented,proving the performance of the power supply to achieve the desired requirements.

关键词： CFETR NBI accelerator grid power supply feedforward control high voltage power supply

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Analytical Model for Magnetic Field of Toroidal D-Shaped HTS Magnet

Analytical Model for Magnetic Field of Toroidal D-Shaped HTS...

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International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD

作者： Meng Song Li Li Yifeng Qiu Li Ren Ying Xu Joint Laboratory on Power Superconducting Technology China Southern Power Grid Company Ltd Guangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The electromagnetic computation complexity of large-scale three-dimensional superconducting magnets is extremely high, posing significant challenges for optimizing their design. In this paper, an analytical model for the magnetic field of toroidal D-shaped high-temperature superconducting (HTS) magnets is developed based on the assumptions of uniform current distribution and the vector potential’s Poisson equation. A comparison with results obtained using the H-formulation reveals that the assumption of uniform current distribution introduces acceptable errors in the magnetic field. To expedite calculations while maintaining precision, the discrete integration method is adopted, providing computation speeds that are two to three orders of magnitude faster than the finite element method (FEM). This model can be applied for calculating parameters such as center magnetic field and critical current, thereby enhancing the efficiency of electromagnetic design for superconducting magnets.

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200-krad/s Polarization Tracking Using Thin Film Lithium Niobate Integrated Dynamic Polarization Controller 29

200-krad/s Polarization Tracking Using Thin Film Lithium Nio...

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29th Opto-Electronics and Communications Conference, OECC 2024

作者： Ye, Junjiang Liu, Youxin Chen, Weibin Cui, Ao Chen, Kaixuan Guo, Changjian Liu, Liu South China Normal University Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics Guangzhou China Zhejiang University State Key Laboratory for Modern Optical Instrumentation College of Optical Science and Engineering Centre for Optical & Electromagnetic Research International Research Center for Advanced Photonics Hangzhou China

ISBN: (纸本)9798350308396

We demonstrate a thin-film lithium niobate (TFLN) integrated dynamic polarization controller (DPC) driven by an adaptive gradient descent algorithm for fast polarization tracking. Experimental results show that the TFLN-based DPC exhibits a fast response time of 530-ps, and achieves a polarization tracking speed of up to 200-krad/s when targeting a specific linear state of polarization (SOP). © 2024 IEEE.

关键词： dynamic polarization controller fast-response high-speed self-adaption thin-film lithium niobate

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A Na-Li dual cation liquid metal battery with high electrode utilization and high cycling stability

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Energy Storage Materials 2024年 73卷

作者： Feng, Shaoming Fan, Lei Zhou, Hao Li, Haomiao Yan, Shuai Zhang, Weixin Guo, Yewei Li, Bo Jiang, Kai Wang, Kangli School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Institute of Electric Power Science of Guizhou Power Grid Co. Ltd Guizhou Guiyang550000 China

Liquid metal batteries (LMBs) with Na anode exhibit the advantages of low-cost, high-safety, long-lifespan, and easy scale-up, making them promising for large-scale energy storage applications. However, the high solubility of Na and its sluggish kinetics in discharge products result in severe self-discharge and low cathode utilization, significantly hindering the development of Na-based LMBs. In this study, a stable Na-Li dual cation LMB with metal Sb cathode is designed based on the in-situ displacement reaction between Na and molten salts of lithium halides electrolyte. This design effectively suppresses the self-discharge of the battery, and the multistage discharge mechanism of the dual-cation system enhances cathode utilization. Moreover, the self-healing property of the Sb cathode protects the electrode against volume expansion and degradation, enhancing cycling performance. The Na-Li| LiCl-KCl-NaCl |Sb cell was constructed and operated at 485 °C. The battery retained 97.02 % of its capacity after 800 cycles at 0.6 C, with a decay rate of 0.00373 % per cycle. Furthermore, the battery achieves a cathode material utilization of 89 % at 0.6 C. These improvements effectively promote the development and application of LMBs. © 2024

关键词： Sodium chloride

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