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2018 26th International Conference on Nuclear Engineering, ICONE 2018

作者： Zou, Zhiqiang Hou, Liqiang Zhang, Ming Deng, Chunrui Peng, Huanhuan Xuedong, Qiao Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China Nuclear and Radiation Safety Center Ministry of Environment Protection of P.R.China Beijing China

ISBN: (纸本)9780791851517

Hydrogen combustion or detonation happened in the containment within the process of the small reactor severe accident may threaten the integrity of the containment. In this paper, based on systemic design of the Small Modular reactor (SMR) surrounded by the steel containment, an innovatory combustible gas control strategy which using the passive containment cooling system (PCCS) and passive autocatalytic recombiners (PARs) is made to control the hydrogen risk in the small steel containment. A severe accident hydrogen risk analysis model is built by the integrative severe accident analysis program MELCOR, the validity of the strategy is analyzed at a typical severe accident. With this understanding, a three-dimensional computed fluid dynamics hydrogen behavior analysis model of the small steel containment is established by GASFLOW code, and the gas distribution non-uniformity in the containment is analyzed. The result shows that the steam condensation process in the containment could be slowed down by controlling the action of PCCS, and the steam concentration in the containment could be in the range of high level, while the oxygen concentration could be in the range of low level. If the PARs were added, the PARs could consume the hydrogen and oxygen in the containment sustainedly. The containment atmosphere could be in an inerted condition during the accident process, even though the hydrogen concentration in the containment is high. The gas distribution non-uniformity analysis result shows that oxygen concentration was low in the extent of high hydrogen concentration and high steam concentration, the steam, oxygen and hydrogen distribution non-uniformity would not affect the inerted atmosphere of containment. Copyright © 2018 ASME.

关键词： Risk analysis

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Calculation of adjoint-weighted reactor kinetics parameters in OpenMC

Calculation of adjoint-weighted reactor kinetics parameters ...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient systems, PHYSOR 2018

作者： Peng, Xingjie Forget, Benoit Smith, Kord Science and Technology on Reactor System Design Technology Laboratory ChengduSichuan610000 China Nuclear Science and Engineering Department Massachusetts Institute of Technology 77 Massachusetts Ave. CambridgeMA02139 United States

ISBN: (纸本)9781713808510

Knowledge of adjoint-weighted kinetics parameters plays an importance role in analyzing the reactor safety and in describing the transient behavior of nuclear reactors during normal operation or accidents. In this work, the capability of calculating adjoint-weighted kinetic parameters, including the effective neutron generation time, the effective delayed neutron fraction, and the ratio of these two quantities was implemented in OpenMC code based on two different methods of interpreting the physical meaning of the adjoint weighting, namely, the iterated fission probability (IFP) method and the Contribution-Linked eigenvalue sensitivity/Uncertainty estimation via Tracklength importance CHaracterization (CLUTCH) method. The results of the implementation were benchmarked by comparison to MCNP5 calculations, Serpent2 calculations and experimental data in 10 critical configurations. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Eigenvalues and eigenfunctions

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Utilizing Cationic Vacancies and Spontaneous Polarization on Cathode to Enhance Zinc-Ion Storage and Inhibit Dendrite Growth in Zinc-Ion Batteries

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Angewandte Chemie 2023年第26期135卷

作者： Dr. Liqi Bai Zihan Hu Cheng Hu Songge Zhang Dr. Yiran Ying Yingge Zhang Lu Li Hanfang Zhang Dr. Nan Li Dr. Shanshan Shi Shuo Liu Dr. Lin Hao Tongyao Liu Prof. Hongwei Huang Prof. Haitao Huang Prof. Yihe Zhang Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Material Sciences and Technology China University of Geosciences Beijing 100083 China Department of Applied Physics and Research Institute for Smart Energy The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China Contribution: Writing - original draft (lead) Writing - review & editing (lead) Faculty of System Design and Intelligent Manufacturing Southern University of Science and Technology Nanshan District Shenzhen Guangdong 518055 China Songshan Lake Materials Laboratory Guangdong 523808 China School of Fashion and Textiles and Research Institute for Intelligent Wearable Systems The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China

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Dynamic Balance Testing system for Micro-Roller Based on MEMS

Dynamic Balance Testing System for Micro-Roller Based on MEM...

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International Conference on Sensing technology, ICST

作者： Jishun Li Xiqiang Ma Xin Sui Fang Yang Zhiqiang Guan Hal Gurgenci Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang China The University of Queensland Brisbane Queensland Australia

ISBN: (数字)9781728148076

ISBN: (纸本)9781728148083

In order to address the problems such as heavy weight, high cost and poor sensitivity related to the swing frame of the existing roller test system, a micro-roller dynamic balance test system based on Micro-Electro-Mechanical systems (MEMS) acceleration sensor is proposed. The MEMS accelerometer is symmetrically embedded acting as the support of the swing frame to measure the vibration acceleration. The circuit board with perforated processing is directly used as the support of the swing frame. Two wires are used to connect the sensor and the data acquisition system to avoid the interference of cable elasticity on the vibration characteristics of the swing frame. The data obtained from this test system has been processed. The influence of various interference signals in the system on the vibration measurement is identified. Vibration signals generated by imbalances are extracted from complex measurement signals. The test data show that the optimized swing frame design has smaller weight, lower cost, higher sensitivity, simpler operation and much broad application range.

关键词： Vibrations Micromechanical devices Frequency measurement Vibration measurement Printed circuits Testing Accelerometers

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Precision Cylindricity Error Measurement system design and Error Analysis

Precision Cylindricity Error Measurement System Design and E...

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International Conference on Sensing technology, ICST

作者： Xiqiang Ma Fang Yang Jishun Li Zhiqiang Guan Hal Gurgenci Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang China The University of Queensland Brisbane Queensland Australia

ISBN: (数字)9781728148076

ISBN: (纸本)9781728148083

A precise cylindricity error measurement system is designed for cylindricity error measurement. Firstly, three-point cylindricity error separation algorithm and cylindricity evaluation method are introduced. By eliminating rotation error and random error, accurate roundness error, radius error of different sections and least square center coordinate of measured sections are calculated, which eliminates the influence of installation eccentricity on measurement results. Then, according to the three-point error measurement principle, a set of precise circle is designed. Cylindricity error measurement system, and the use of OpenGL graphics technology to reconstruct the shape of the cylinder and three-dimensional display. Finally, a number of groups of experiments were carried out on the cylinder standard parts, and the experimental results were analyzed. The results show that the system can realize cylindricity error measurement based on three-point method, which is consistent with the nominal accuracy of standard parts, and has certain application value.

关键词： Measurement uncertainty Shape Sensors Position measurement Coordinate measuring machines Shape measurement Wavelength measurement

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ReRAM Crossbar-Based Analog Computing Architecture for Naive Bayesian Engine

ReRAM Crossbar-Based Analog Computing Architecture for Naive...

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IEEE International Conference on Computer design: VLSI in Computers and Processors, (ICCD)

作者： Bing Wu Dan Feng Wei Tong Jingning Liu Chengning Wang Wei Zhao Mengye Peng Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage System Engineering Research Center of Data Storage Systems and Technology (School of Computer Science and Technology Huazhong University of Science and Technology) Ministry of Education of China

Recent advances in Resistive RAM (ReRAM) have explored the in-situ Matrix-Vector Multiplication (MVM) ability of crossbar arrays to achieve high energy-efficiency Process-In-Memory (PIM) architectures for Convolutional Neural Network (CNN), image processing, and so on. However, the existing ReRAM-based PIM architectures suffer from considerable additional auxiliary logic and device variations. In this work, we propose a novel analog computing architecture NB Engine for classification by implementing Naive Bayesian (NB) algorithm on ReRAM crossbar arrays. The two key steps of the NB algorithm, that is, probability calculation and electing the class that has the highest probability, are elaborately accomplished in our architecture. The ReRAM arrays are both used as storage and computation components. We store the pre-calculated prior probabilities and conditional probabilities of every class in crossbar arrays. Then the probability calculation step is completed in parallel through the MVM operation of the array. In general, the election step is a multiple-comparison procedure and is normally implemented by a comparison tree. Here, we reuse the max pooling module in a conventional CNN PIM architecture to realize a compatible comparison logic. However, neither of the two designs can avoid the overhead of costly high bit-precision Analog-to-Digital Converters (ADCs). So we introduce a novel analog parallel comparison design which does not need any ADCs or other computing logic with better energy-saving and area-efficiency. Our proposed NB Engine is tested by 11 various datasets. The influence of several non-ideal device properties is discussed and the NB Engine exhibits great tolerance to these variations. The experiment results show that our design offers a runtime speedup up to 2289.6x compared with the software-implemented NB classifier with negligible accuracy loss. In addition, the NB Engine saves 96.2% energy consumption and 45.2% array area compared with the CNN P

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Corrigendum to “The encountering dune fields in a bidirectional flow system in the northwestern South china Sea: Pattern, morphology, and recent dynamics” [Geomorphology 406 (2022) 108210]

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Geomorphology 2022年 413卷

作者： Xiaochuan Ma Jinyuan Li Jun Yan Xingru Feng Yongdong Song Tao Xu Lihua Zhuang Zhendong Luan Jianxing Zhang CAS Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China School of Ocean Sciences China University of Geosciences (Beijing) Beijing China Longyuan (Beijing) Wind Power Engineering Design Consulting Co. Ltd Beijing 100083 China CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China

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Motion Planning for Heterogeneous Unmanned systems under Partial Observation from UAV

arXiv

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arXiv 2020年

作者： Chen, Ci Wan, Yuanfang Li, Baowei Wang, Chen Xie, Guangming Jiang, Huanyu College of Biosystems Engineering and Food Science Zhejiang University Hangzhou310058 China National Engineering Research Center for Software Engineering Peking University Beijing100871 China State Key Laboratory of Turbulence and Complex Systems Intelligent Biomimetic Design Lab College of Engineering Peking University Beijing100871 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518055 China Peng Cheng Laboratory Shenzhen518055 China

For heterogeneous unmanned systems composed of unmanned aerial vehicles (UAVs) and unmanned ground vehicles (UGVs), using UAVs serve as eyes to assist UGVs in motion planning is a promising research direction due to the UAVs’ vast view scope. However, due to UAVs flight altitude limitations, it may be impossible to observe the global map, and motion planning in the local map is a POMDP (Partially Observable Markov Decision Process) problem. This paper proposes a motion planning algorithm for heterogeneous unmanned system under partial observation from UAV without reconstruction of global maps, which consists of two parts designed for perception and decision-making, respectively. For the perception part, we propose the Grid Map Generation Network (GMGN), which is used to perceive scenes from UAV’s perspective and classify the pathways and obstacles. For the decision-making part, we propose the Motion Command Generation Network (MCGN). Due to the addition of memory mechanism, MCGN has planning and reasoning abilities under partial observation from UAVs. We evaluate our proposed algorithm by comparing with baseline algorithms. The results show that our method effectively plans the motion of heterogeneous unmanned systems and achieves a relatively high success rate. Copyright © 2020, The Authors. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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Approaching three-dimensional quantum Hall effect in bulk HfTe5

arXiv

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arXiv 2020年

作者： Wang, Pang Ren, Yafei Tang, Fangdong Wang, Peipei Hou, Tao Zeng, Hualing Zhang, Liyuan Qiao, Zhenhua International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale Synergetic Innovation Centre of Quantum Information and Quantum Physics CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics University of Science and Technology of China Hefei China Department of Physics Southern University of Science and Technology Shenzhen Institute for Quantum Science and Engineering Shenzhen518055 China Solid State Nanophysics Max Plank Institute for Solid State Research Stuttgart Germany

The discovery of quantum Hall effect in two-dimensional (2D) electronic systems inspired the topological classifications of electronic systems1,2. By stacking 2D quantum Hall effects with interlayer coupling much weaker than the Landau level spacing, quasi-2D quantum Hall effects have been experimentally observed3~7, due to the similar physical origin of the 2D counterpart. Recently, in a real 3D electronic gas system where the interlayer coupling is much stronger than the Landau level spacing, 3D quantum Hall effect has been observed in ZrTe58. In this Letter, we report the electronic transport features of its sister bulk material, i.e., HfTe5, under external magnetic field. We observe a series of plateaus in Hall resistance ρxy as magnetic field increases until it reaches the quantum limit at 1~2 Tesla. At the plateau regions, the longitudinal resistance ρxx exhibits local minima. Although ρxx is still nonzero, its value becomes much smaller than ρxy at the last few plateaus. By mapping the Fermi surface via measuring the Shubonikov-de Haas oscillation, we find that the strength of Hall plateau is proportional to the Fermi wavelength, suggesting that its formation may be attributed to the gap opening from the interaction driven Fermi surface instability. By comparing the bulk band structures of ZrTe5 and HfTe5, we find that there exists an extra pocket near the Fermi level of HfTe5, which may lead to the finite but nonzero longitudinal conductance. Copyright © 2020, The Authors. All rights reserved.

关键词： Tellurium compounds

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Optimizing design of multi-coil solenoid HTS magnet by PSO algorithm

Optimizing design of multi-coil solenoid HTS magnet by PSO a...

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2018 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2018

作者： Huang, Wen Chen, Jun Quan National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781538624944

The superconducting magnet has been used more and more widely due to the advances in refrigeration technology and superconducting material. Consequently, its design requirements become higher. This paper combines particle swarm optimization (PSO) and numerical calculation using finite-element (FE) for the rapidly-optimized design of multi-coil solenoid high-temperature-superconducting (HTS) magnet which must satisfy the need of electromagnetism. On this basis, the length of the material used will be minimized. With the optimum design of a magnetic fluid propeller as an example, the second-generation HTS material is selected for developing a superconducting magnet prototype, which is not lower than 6T in central magnetic field strength, not less than 340∗100mm2 in its uniform region and not less than 100mm in diameter. © 2018 IEEE.

关键词： Superconducting magnets

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