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13th International Conference on Information Securityand Cryptology, Inscrypt 2017

作者： Yin, Jun Ma, Chuyan Lyu, Lijun Song, Jian Zeng, Guang Ma, Chuangui Wei, Fushan State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China State Key Laboratory of Cryptology P.O. Box 5159 Beijing100878 China Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China Data Assurance and Communication Security Research Center Chinese Academy of Sciences Beijing100093 China School of Cyber Security University of Chinese Academy of Sciences Beijing100049 China National University of Defense Technology Changsha410073 China Army Aviation Institute Beijing101116 China

ISBN: (纸本)9783319751597

Differential and linear cryptanalysis are two of the most effective attacks on block ciphers. Searching for (near) optimal differential or linear trails is not only useful for the security evaluation of block ciphers against these attacks, but also indispensable to the cryptanalysts who want to attack a cipher with these techniques. In recent years, searching for trails automatically with Mixed-Integer Linear Programming (MILP) gets a lot of attention. At first, Mouha et al. translated the problem of counting the minimum number of differentially active S-boxes into an MILP problem for word-oriented block ciphers. Subsequently, in Asiacrypt 2014, Sun et al. extended Mouha et al.’s method, and presented a technique which can find actual differential or linear characteristics of a block cipher in both the single-key and related-key models. In this paper, we refine the constraints of the 2-XOR operation in order to reduce the overall number of variables and constraints. Experimental results show that MILP models with the refined constraints can be solved more efficiently. We apply our method to HIGHT (an ISO standard), and we find differential (covering 11 rounds) or linear trails (covering 10 rounds) with higher probability or correlation. Moreover, we find so far the longest differential and linear distinguishers of HIGHT. © Springer International Publishing AG, part of Springer Nature 2018.

关键词： ISO Standards

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Design and experiment of test system for simulating aero-engine burn fragments fault 2

Design and experiment of test system for simulating aero-eng...

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2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017

作者： Manguo, Huang Wei, Liu Defeng, Liu Yanshan, Wang Xin, Li Advanced Sensor Technology Center AVIC Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing China Aviation Key Laboratory of Science and Technology On Special Condition Monitoring Sensor Technology Beijing China

ISBN: (纸本)9781509048601

The aero-engine gas path fault is the important aero-engine fault and has high frequency. This fault must be found timely and solved as early as possible to make sure the normal work of aero-engine and the safe flight of the airplane. The burn fragments fault is a common fault aero-engine gas path fault. The special aero-engine gas path fault simulation test system is necessary if we want to study the burn fragments fault efficiently and deeply. Based on the electrostatic monitoring technology, a kind of test system of aero-engine gas path fault was designed in this paper, and the burn fragments fault was simulated by the test system. Finally, the experiments for aero-engine gas path faults simulations were performed, and the effectiveness of simulation test system of aero-engine gas path fault was verified. © 2017 IEEE.

关键词： Electrostatics

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Fast Fault Detection and Current Limiting Strategy of HVDC Circuit Breaker 5

Fast Fault Detection and Current Limiting Strategy of HVDC C...

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2018 5th International Conference on advanced Composite Materials and Manufacturing Engineering, ACMME 2018

作者： Li, Wei Wu, Xueguang Liu, Dong Chang, Bin Zou, Le School of Electronic Engineering North China Electric Power University Changping District Beijing102206 China State Key Lab of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing102209 China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing102209 China Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing102209 China

HVDC transmission has become the most valuable engineering technology because of its own advantages. But the rapid detection and isolation of DC side faults has been one of the major technical matters in the development of DC grids. Highvoltage DC circuit breaker is an important equipment to solve this problem, and becomes the current research hotspot. According to the process of HVDC breaker, this paper analyzes the fault detection and current limiting control of HVDC breakers, and proposes a fault detection method based on ROCOV (Rate Of Change Of Voltage) and a current limiting strategy of operation of arresters by sequence. It can reduce the operation time of the circuit breaker and the peak value of the fault current. Finally, simulation analysis is performed on the PSCAD/EMTDC to verify the correctness of the method. © Published under licence by IOP Publishing Ltd.

关键词： Fault detection

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Microstructure and Mechanical Properties of AISI 304L Austenitic Stainless Steel Processed by Various Schedules of Rolling

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Journal of Physics: Conference Series 2020年第1期1688卷

作者： A G Raab G I Raab A A Tokar O V Rybalchenko A N Belyakov S V Dobatkin P La Institute of Physics of Advanced Materials Ufa State Aviation Technical University K. Marx st. 12 450008 Ufa Russia A A Baikov Institute of Metallurgy and Materials Science of RAS Leninsky pr. 49 119334 Moscow Russia National University of Science and Technology 'MISIS' Leninskiy pr. 4 119049 Moscow Russia Belgorod State University Pobeda st. 85 308015 Belgorod Russia State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou China

The paper studies various rolling schedules implemented at 500°C (incl. direct, reverse, and cross rolling) and their effect on the structure formation and mechanical properties in AISI 304L stainless steel samples. Both TEM and SEM research techniques were applied. An ultrafine grain-subgrain microstructure was found to be formed inside elongated original grains. Rolling-processed microstructural elements were close in their size with the minimum value observed after a reverse rolling (240 nm). Mechanical properties were studied using microhardness measurements and tensile testing revealing a considerable increase in strength accompanied by a density reduction upon deformation. The strength values in the material subjected to all three rolling schedules are relatively close to the highest yield strength and ultimate tensile stress observed after reverse rolling with a strain degree of 70%.

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Blue Energy: Polymeric Nano‐Blue‐Energy Generator Based on Anion‐Selective Ionomers with 3D Pores and pH‐Driving Gating (Adv. Energy Mater. 44/2020)

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advanced Energy Materials 2020年第44期10卷

作者： Xuanbo Zhu Jundong Zhong Junran Hao Yuzhang Wang Jiajia Zhou Jingwen Liao Yujie Dong Jinhui Pang Haibo Zhang Zizhun Wang Wei Zhang Weitao Zheng Zhenhua Jiang Yahong Zhou Lei Jiang National and Local Joint Engineering Laboratory for Synthetic Technology of High Performance Polymer College of Chemistry Jilin University Changchun Jilin 130012 P. R. China CAS Key Laboratory of Bio‐inspired Materials and Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing 100191 P. R. China Guangzhou Institute of Advanced Technology Chinese Academy of Sciences Guangzhou Guangdong 511458 P. R. China State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang 310014 P. R. China State Key Laboratory of Automotive Simulation and Control School of Materials Science and Engineering Electron Microscopy Center International Center of Future Science Jilin University Changchun Jilin 130012 P. R. China

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Coupled-channel interpretation of the LHCb double-J/ψ spectrum and hints of a new state near the J/ψJ/ψ threshold

arXiv

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arXiv 2020年

作者： Dong, Xiang-Kun Baru, Vadim Guo, Feng-Kun Hanhart, Christoph Nefediev, Alexey CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Zhong Guan Cun East Street 55 Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Institute for Theoretical and Experimental Physics NRC "Kurchatov Institute" Moscow117218 Russia P.N. Lebedev Physical Institute of the Russian Academy of Sciences Leninskiy Prospect 53 Moscow119991 Russia Institute for Advanced Simulation Institut für Kernphysik Jülich Centerfor Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany Moscow Institute of Physics and Technology 141700 Institutsky lane 9 Dolgoprudny Moscow Region Russia

Recently, the LHCb Collaboration reported pronounced structures in the invariant mass spectrum of J/ψ-pairs produced in proton-proton collisions at the Large Hadron Collider. In this Letter, we argue that the data can be very well described within two variants of a coupled-channel approach employing T-matrices consistent with unitarity: (i) with just two channels, J/ψJ/ψ and ψ(2S)J/ψ, as long as energy-dependent interactions in these channels are allowed, or (ii) with three channels J/ψJ/ψ, ψ(2S)J/ψ and ψ(3770)J/ψ with just constant contact interactions. Both formulations hint at the existence of a near-threshold state in the J/ψJ/ψ system with the quantum numbers JPC = 0++ or 2++, which we refer to as X(6200). We suggest experimental tests to check the existence of this state and discuss what additional channels need to be studied experimentally to allow for distinctive tests between the two mechanisms proposed. If the molecular nature of the X(6200), as hinted by the three-channel approach, is confirmed, many other double-quarkonium states should exist driven by the same binding mechanism. In particular, there should be an ηcηc molecule with a similar binding energy. Copyright © 2020, The Authors. All rights reserved.

关键词： Binding energy

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Design of temperature compensation for silicon-sapphire pressure sensor

Design of temperature compensation for silicon-sapphire pres...

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2017 IEEE International Conference on Imaging Systems and Techniques, IST 2017

作者： Manguo, Huang Defeng, Liu Chao, Lu Zhanshe, Guo Xin, Li Advanced Sensor Technology Center AVIC Beijing Changcheng Aeronautic Measurement Control Technology Research Institute Aviation Key Laboratory of Science and Technology Special Condition Monitoring Sensor Technology Beijing China School of Instrument Science and Opto-electronics Engineering State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781538616208

In order to solve the problem that the temperature drift of the silicon-on-sapphire pressure sensor is too large to reduce the accuracy of pressure measurement at high temperature, a temperature compensation scheme based on a single chip is proposed. The temperature of the working environment is obtained by a PT100, and integrated with the output of pressure sensor to calculate the compensated pressure sensor. Problems of power supply and signal acquisition are solved by the high precision, low drift voltage and current references, programmable amplifiers and high precision ADCs on chip. According to the working characteristics of the silicon-on-sapphire pressure sensor, an efficient temperature compensation algorithm is designed, and written to the on-chip ARM processor. The experimental results show that the maximum measurement error of pressure in the temperature range of -20∼250°C and measurement range of 0∼28 MPa is 8.37%FS before compensation and reduced to 0.3%FS after compensation. The accuracy of the sensor is greatly improved by the compensation system. © 2017 IEEE.

关键词： Pressure sensors

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Design and implementation of rigid-flexible coupling for a half-flexible single jack nozzle

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Chinese Journal of Aeronautics 2016年第6期29卷 1477-1483页

作者： Chen Pengfei Wu Feng Xu Jinglei Feng Xudong Yang Qiao Aviation Key Laboratory of Science and Technology on Aero-Engine Altitude Simulation China Gas Turbine Establishment Aviation Engine Corporation of China Department of Power Engineering Nanjing University of Aeronautics and Astronautics

The aerodynamic design of a rigid-flexible coupling profile is the decisive factor for the flow-field quality of a supersonic free jet wind tunnel nozzle, and its mechanic dynamic features are the key for engineering implementation of continuous Mach number regulations. To fulfill the requirements of a free jet inlet/engine compatibility test within a wide simulation envelop, both uniform flow-fields of continuous acceleration and deceleration are necessary. In this paper, the aerodynamic design methods of an expansion wall and machinery implementation plan for the halfflexible single jack nozzle were researched. The profile control in nozzle flexible plate design was studied with a rigid-flexible coupling method. Design and calculations were performed with the help of numerical simulation. The technique of axial free stretching of the flexible plate was used to improve the matching performance between the designed elasticity profile and the theoretical one, and the rigid-flexible coupling structure was calibrated by wind tunnel tests. Results indicate that the flexible plate aerodynamic design method used here is effective and feasible. Via rigidflexible coupling design, the flexible plate agrees with the rigid body very well, and continuous Mach number changes can be achieved during the tests. The nozzle’s exit flow-field uniformity meets the requirements of China Military Standard(GJB).

关键词： Aerodynamic profile Flow-field quality Free jet Nozzle Rigid-flexible coupling Variable Mach number Wind tunnel

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A rotation method to calibrate BPM electric offsets

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Journal of Physics: Conference Series 2019年第1期1350卷

作者： M.W. Wang D. Wang Z.M. Wang M.T. Qiu S.X. Zheng P.F. Ma X.L. Guan W.H. Huang X.W. Wang Key Laboratory of Particle & Radiation Imaging (Tsinghua University) Beijing 100084 China Laboratory for Advanced Radiation Sources and Application Tsinghua University Beijing 100084 China Department of Engineering Physics Tsinghua University Beijing 100084 China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect (Northwest Institute of Nuclear Technology) Xi'an 710024 China

Beam position monitor is a key instrument for machine commissioning. To measure beam position accurately, offline calibrations to acquire the sensitivity and offsets of the BPM are essential prerequisites. A new method to calibrate the BPM electric offset is proposed in this paper. By measuring the location variation of the BPM electric center after rotating the BPM 180 degrees, the BPM offset can be derived. The method is more convenient, universal and accurate than the traditional methods. The method is successfully applied to calibrate the button BPM of Xi'an Proton Application Facility. The repetitive measurement error is 20.8μm.

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Research on knowledge network modelling for aero-craft system design 7

Research on knowledge network modelling for aero-craft syste...

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7th International Conference on simulation and Modeling Methodologies, Technologies and Applications, SIMULTECH 2017

作者： Zhai, Xiang Dai, Feng Qu, Huiyang Zhong, Lingling Du, Chenyong Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China School of Mechanical Engineering Zhejiang University Hangzhou China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing China Aviation Engineering Institute Civil Aviation Flight University of China Sichuan China Beijing ZhiYuanChuangTong IT Co Ltd Beijing China

ISBN: (纸本)9789897582653

A great amount of existing knowledge is required during the development of aero-craft system. At present, the existing knowledge organization model construct different knowledge model for different stages is difficult to adapt to the complicated product life cycle application. This study proposes a product development oriented knowledge network model focusing on expressing the knowledge demands and connecting the computer-aided system. Under the overall knowledge network model, this study describes the ontology description method of spacecraft product model, development tasks and aerospace terminology. Recommending missile aerodynamic knowledge within the design stage is presented as a case study, and the framework and the method is proved to be effective. © Copyright 2017 by SCITEPRESS - Science and technology Publications, Lda. All rights reserved.

关键词： Ontology

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