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Converting a two-dimensional ferromagnetic insulator into a high-temperature quantum anomalous Hall system by means of an appropriate surface modification

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Physical Review B 2019年第16期99卷 165410-165410页

作者： Huisheng Zhang Wei Qin Mingxing Chen Ping Cui Zhenyu Zhang Xiaohong Xu Key Laboratory of Magnetic Molecules and Magnetic Information Materials of the Ministry of Education Research Institute of Materials Science and College of Physics and Electronic Information Shanxi Normal University Linfen 041004 China International Center for Quantum Design of Functional Materials (ICQD) Hefei National Laboratory for Physical Sciences at Microscale (HFNL) and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China School of Physics and Electronics Hunan Normal University Changsha Hunan 410081 China Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences School of Physical Sciences University of Science and Technology of China Hefei Anhui 230026 China

The recent discoveries of two-dimensional (2D) ferromagnetic insulators Cr2Ge2Te6 and CrI3 [Gong et al., Nature (London) 546, 265 (2017); Huang et al., Nature (London) 546, 270 (2017).] offer unprecedented opportunities for exploration of exotic new quantum phenomena. Here we use first-principles approaches to carry out a comparative study of the 2D heterostructures of germanene/Cr2Ge2Te6 and germanene/CrI3, resulting in a predictive design of a highly appealing high-temperature quantum anomalous Hall effect (QAHE) system. We show that germanene-passivated Cr2Ge2Te6 becomes topologically nontrivial, and can harbor the QAHE at ∼30 K; in contrast, germanene-passivated CrI3 becomes a topologically trivial ferromagnetic metal. We rationalize these results based on the different interfacial couplings in the two systems, much stronger for the former because of effective Ge-Ge and Ge-Te bondings. We further show that both silicene/Cr2Ge2Te6 and Cr2Ge2Te6/Ge(111) can also harbor QAHEs, offering broader opportunities for potential experimental realization of a high-temperature QAHE.

关键词： Edge states Ferromagnetism Quantum anomalous Hall effect Ultrathin films First-principles calculations

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Federated learning with differential privacy: Algorithms and performance analysis

arXiv

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arXiv 2019年

作者： Wei, Kang Li, Jun Ding, Ming Ma, Chuan Yang, Howard H. Farhad, Farokhi Jin, Shi Quek, Tony Q. S. Poor, H. Vincent School of Electrical and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China Data61 Csiro SydneyNSW2015 Australia Singapore University of Technology and Design Information System Technology and Design Pillar Singapore National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Department of Electrical Engineering Princeton University PrincetonNJ08544 United States

Federated learning (FL), as a manner of distributed machine learning, is capable of significantly preserving clients' private data from being exposed to external adversaries. Nevertheless, private information can still be divulged by analyzing on the differences of uploaded parameters from clients, e.g., weights trained in deep neural networks. In this paper, to effectively prevent information leakage, we propose a novel framework based on the concept of differential privacy (DP), in which artificial noises are added to the parameters at the clients side before aggregating, namely, noising before model aggregation FL (NbAFL). First, we prove that the NbAFL can satisfy DP under distinct protection levels by properly adapting different variances of artificial noises. Then we develop a theoretical convergence bound of the loss function of the trained FL model in the NbAFL. Specifically, the theoretical bound reveals the following three key properties: 1) There is a tradeoff between the convergence performance and privacy protection levels, i.e., a better convergence performance leads to a lower protection level;2) Given a fixed privacy protection level, increasing the number N of overall clients participating in FL can improve the convergence performance;3) There is an optimal number of maximum aggregation times (communication rounds) in terms of convergence performance for a given protection level. Furthermore, we propose a K-random scheduling strategy, where K (1 Copyright © 2019, The Authors. All rights reserved.

关键词： Deep neural networks

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Shape-Memory Polymers: Mechanically Robust and UV-Curable Shape-Memory Polymers for Digital Light Processing Based 4D Printing (Adv. Mater. 27/2021)

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Advanced Materials 2021年第27期33卷

作者： Biao Zhang Honggeng Li Jianxiang Cheng Haitao Ye Amir Hosein Sakhaei Chao Yuan Ping Rao Yuan-Fang Zhang Zhe Chen Rong Wang Xiangnan He Ji Liu Rui Xiao Shaoxing Qu Qi Ge Frontiers Science Center for Flexible Electronics (FSCFE) Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials and Engineering (IBME) Northwestern Polytechnical University 127 West Youyi Road Xi'an 710072 China Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and Technology Shenzhen 518055 China School of Engineering and Digital Arts University of Kent Canterbury Kent CT2 7NT UK State Key Laboratory for Strength and Vibration of Mechanical Structures Department of Engineering Mechanics Xi'an Jiaotong University Xi'an 710049 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 China Digital Manufacturing and Design Centre Singapore University of Technology and Design Singapore 487372 Singapore State Key Laboratory of Fluid Power and Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering Mechanics Zhejiang University Hangzhou 310027 China

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Cooling Performance for Cylindrical Film-Cooling Hole with Divided Downstream Crescent-Shaped Block

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IOP Conference Series: Earth and Environmental science 2020年第1期461卷

作者： Pengfei Zhang Zhiting Tong Fei Wang Linchao Bai Chao Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin 300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin 300384 China

The cooling performances for the cylindrical film-cooling hole with divided downstream crescent-shaped blocks were numerically investigated in present study. Four configurations with divided crescent-shaped block, i.e. linear, 30° convergence, 30° expansion, and 30° curved expansion, were studied at typical flow conditions. The successive crescent-shaped block case and the no block case were also solved in comparison. The temperature profiles, the local and lateral averaged cooling effectiveness at blowing ratios of 0.5 to 1.5 were obtained. As compared with the successive block case, the lateral coolant coverage were widened by using the divided block, and thus the lateral averaged cooling effectiveness were improved, especially at higher blowing ratios. Comparatively, the cylindrical hole with 30° expansion crescent-shaped block exhibited highest cooling performance.

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Structural design and strength analysis of multi-ring packed flywheel with heavy metal alloy segments

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IOP Conference Series: Materials science and Engineering 2019年第1期657卷

作者： L Jiang W Zhang C W Wu L P Zhang Y X Zhang Z Y Liu National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China

Flywheel, as a kinetic energy storage and conversion device, has promising applications due to its high efficiency, no pollution and long lifetime. In particular, with a three-layer structure packed with heavy metal alloy middle layer, a flywheel can achieve both a large rotational inertia and a high energy density. To guarantee structural strength safety of this type of multi-ring packed flywheel operating at high temperature, structural and thermal stress analysis for a flywheel with a tungsten alloy layer sandwiched between two stainless steel layers is carried out using finite element method (FEM). Based on plane stress assumption, flywheel stress characteristic along radius under assembly force, centrifugal force and thermal loading is demonstrated. The results show that, the rise of temperature causes inconsistent thermal expansion between neighbouring layers and results in a large thermal stress. Particularly, a high circumferential tensile stress occurs in the middle layer. It is also found that, the segments of the middle tungsten alloy layer can efficiently relieve the inconsistent thermal expansion and lower the thermal stress. Moreover, the number of segments significantly influences the efficiency of thermal stress releasing and the reserved gap between adjacent segments significantly improves the contact pressure between inner hub and tungsten alloy layer. This work may provide reference for structural design of the multi-ring packed flywheels under thermal loading.

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Multi-objective Optimization of Non-uniform Beam for Minimum Weight and Sound Radiation

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Transactions of Tianjin University 2017年第4期23卷 380-393页

作者： Furui Xiong Mengxin He Yousef Naranjani Qian Ding Jianqiao Sun Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China School of Mechanical Engineering Tianjin University School of Engineering University of California Merced

A multi-objective optimization of non-uniform beams is presented for minimum radiated sound power and weight. The transfer matrix method is used to compute the structural and acoustic responses of a non-uniform beam accurately and efficiently. The multi-objective particle swarm optimization technique is applied to search the Pareto optimal solutions that represent various compromises between weight and sound radiation. Several constraints are imposed, which substantially reduce the volume fraction of feasible solutions in the design space. Two non-uniform beams with different boundary conditions are studied to demonstrate the multi-objective optimal designs of the structure. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.

关键词： Acoustic generators Acoustic properties Acoustic wave propagation Acoustic wave scattering Optimal systems Pareto principle Particle swarm optimization (PSO) Transfer matrix method

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Synergistic Glutathione Depletion and STING Activation to Potentiate Dendritic Cell Maturation and Cancer Vaccine Efficacy

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Angewandte Chemie 2024年第10期136卷

作者： Dr. Jianping Liu Dr. Ye Zhang Bowei Yang Dr. Yingbo Jia Prof. Rui-Tian Liu Dr. Lingwen Ding Prof. Zheyu Shen Prof. Xiaoyuan Chen Departments of Diagnostic Radiology Surgery Chemical and Biomolecular Engineering and Biomedical Engineering Yong Loo Lin School of Medicine and College of Design and Engineering National University of Singapore Singapore 119074 Singapore Nanomedicine Translational Research Program Yong Loo Lin School of Medicine National University of Singapore Singapore 117597 Singapore School of Biomedical Engineering Southern Medical of University Guangzhou Guangdong 510515 P. R. China CAS Key Laboratory of Nano-Bio Interface Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou Jiangsu 215123 P. R. China State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Department of Pathology Yong Loo Lin School of Medicine National University of Singapore Singapore 119074 Singapore Clinical Imaging Research Center Center for Translational Medicine Yong Loo Lin School of Medicine National University of Singapore Singapore 117599 Singapore Institute of Molecular and Cell Biology Agency for Science Technology and Research (A*STAR) 61 Biopolis Drive Proteos Singapore 138673 Singapore

Dendritic cell (DC) maturation and antigen presentation are key factors for successful vaccine-based cancer immunotherapy. This study developed manganese-based layered double hydroxide (Mn-LDH) nanoparticles as a self-adjuvanted vaccine carrier that not only promoted DC maturation through synergistically depleting endogenous glutathione (GSH) and activating STING signaling pathway, but also facilitated the delivery of model antigen ovalbumin (OVA) into lymph nodes and subsequent antigen presentation in DCs. Significant therapeutic-prophylactic efficacy of the OVA-loaded Mn-LDH (OVA/Mn-LDH) nanovaccine was determined by the tumor growth inhibition in the mice bearing B16-OVA tumor. Our results showed that the OVA/Mn-LDH nanoparticles could be a potent delivery system for cancer vaccine development without the need of adjuvant. Therefore, the combination of GSH exhaustion and STING pathway activation might be an advisable approach for promoting DC maturation and antigen presentation, finally improving cancer vaccine efficacy.

关键词： Antigen Delivery DC Maturation GSH Depletion ROS Upregulation STING Activation

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Preliminary evaluation of U 3 Si 2 -FeCrAl fuel performance in light water reactors through a multi-physics coupled way

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Nuclear Engineering and design 2018年 328卷 27-35页

作者： Yanan He Ping Chen Yingwei Wu G.H. Su Wenxi Tian Suizheng Qiu Shaanxi Engineering Research Center of Advanced Nuclear Energy School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an City 710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China

U 3 Si 2 -FeCrAl fuel system is a potential choice for Accident Tolerant Fuel (ATF) for its higher uranium density, improved fuel thermal conductivity and stronger oxidation resistance. In this work, a new multi-physic fuel performance code called BEEs for LWR fuels has been developed based on Multiphysics Object-Oriented Simulation Environment (MOOSE) using the Object-Oriented Programming (OOP) method. As a first step to verify the capability of BEEs, one problem has been conducted using BEEs and compared with the results from BISON and ABAQUS. Then, the most recently available U 3 Si 2 -FeCrAl behavior models have been coded in BEEs. Fuel performance analysis was conducted for U 3 Si 2 -FeCrAl fuel system using BEEs and comparisons with UO 2 -Zr4 and U 3 Si 2 -Zr4 were made in this work. The results show that U 3 Si 2 -FeCrAl fuel system can lower the fuel peaking temperature about 300 K and have flat radial temperature distribution which can mitigate or eliminate the fuel cracking during power up. Further, the pellet-cladding mechanic interaction can be delayed or fully eliminated employing U 3 Si 2 -FeCrAl fuel system in light water reactors (LWRs).

关键词： U 3 Si 2 Multiphysics Fuel performance MOOSE BEEs

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Optimization of the Circuit Parameter in Class-E Power Amplifier in the Two-coil Wireless Power Transfer system

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IOP Conference Series: Materials science and Engineering 2020年第1期740卷

作者： Zhuang Sun Qing Liu Kun Li Bin Hu Haibo Zhao Yankai Shi Shijie Zhang Yang Liu Tianjin Key Laboratory of Film Electronic and Communication Device Tianjin University of Technology Tianjin China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology) Tianjin China Tianjin Institute of Power Sources Tianjin China

In this paper, the circuit parameters of the Class-E power amplifier are investigated and optimized to achieve the maximum of output power and efficiency in a two-coil Wireless Power Transfer (WPT) system. The circuit is simulated with software named Saber. Working frequency, the value of capacitors and inductor, which has relationship with the output power and efficiency, are investigated during the simulation. With the simulation results, it is found that the frequency and the shunt capacitor need to be optimized for high performance of the wireless power transfer system.

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Research on motion error of cylindrical roller bearings under radial load

Research on motion error of cylindrical roller bearings unde...

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ASME 2018 International design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2018

作者： Yongjian, Yu Jishun, Li Guoding, Chen Yujun, Xue Zhuoyi, Si Gurgenci, Halim Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang Henan China School of Mechanical Engineering Northwestern Polytechnical University Xi’an Shanxi China School of Mechatronics Engineering Henan University of Science and Technology Luoyang Henan China School of Engineering University of Queensland BrisbaneQLD Australia

ISBN: (纸本)9780791851791

Since the rotary motion of a rolling bearing is implemented by bearing components under geometric constraints, the motion accuracy of an assembled bearing should also be the result of interaction among geometric errors of bearing components. Therefore, it is significant to understand the relationship between the geometric errors of bearing components and motion accuracy of an assembled bearing for the design of high accuracy bearing. Based on quasi-static analytical method, a mathematical model for motion error of cylindrical roller bearings is established considering the roundness error of outer raceway. The motion error of a rolling bearing is affected by the amplitude and harmonic order of the roundness error of outer raceway, number of rollers and the operating conditions such as radial load, rotary speed of outer ring. The effects of above parameters are analyzed. The results show that the motion accuracy of a cylindrical roller bearing degrades with the increase of amplitude of the roundness error of outer raceway and the rotary speed of outer ring. The variation of the radial displacement of outer ring varies periodically with the increase of the harmonic order of the roundness error of outer raceway, and its period is equal to the roller number. With the increase of the roller number, the variation of radial displacement of the outer ring fluctuates. The larger the radial load is, the smaller the variation of radial displacement of outer ring is. The results would be helpful to reduce the production costs by controlling the distribution of machining tolerance of bearing components. Copyright © 2018 ASME

关键词： Rollers (machine components)

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