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International Conference on Instrumentation, Measurement, Computer, Communication and Control (IMCCC)

作者： Yang Gao Hongsheng Li Libin Huang Songli Wang School of Instrument Science and Engineering Southeast University Nanjing China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Southeast University Ministry of Education Nanjing China Aviation Key Laboratory of Science and Technology on Inertia FACRI Xi'an China

ISBN: (数字)9781538682463

ISBN: (纸本)9781538682470

Because of the mismatch of material properties between silicon and glass, especially the mismatching thermal expansion coefficients, the Micromechanical Silicon Resonant Accelerometer based on the Deep Dry Silicon On Glass (DDSOG) technique is seriously affected by the temperature during the fabrication, packaging and use processes. Based on the working principle and temperature characteristics of Micromechanical Silicon Resonant Accelerometer, the effect of the mismatching thermal expansion coefficients of silicon and glass is analyzed, and a Single-Anchor-Supported accelerometer structure with low temperature sensitivity is designed. simulation results show that the structure can effectively reduce the effect of mismatching thermal expansion coefficients of silicon and glass.

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AlphaStock: A buying-winners-and-selling-losers investment strategy using interpretable deep reinforcement attention networks

arXiv

引用

arXiv 2019年

作者： Wang, Jingyuan Zhang, Yang Tang, Ke Wu, Junjie Xiong, Zhang MOE Engineering Research Center of Advanced Computer Application Technology School of Computer Science Engineering Beihang University Beijing China Institute of Economics School of Social Sciences Tsinghua University Beijing China Beijing Key Laboratory of Emergency Support Simulation Technologies for City Operations School of Economics and Management Beihang University Beijing China Beijing Advanced Innovation Center for BDBC Beihang University Beijing China

Recent years have witnessed the successful marriage of finance innovations and AI techniques in various finance applications including quantitative trading (QT). Despite great research efforts devoted to leveraging deep learning (DL) methods for building better QT strategies, existing studies still face serious challenges especially from the side of finance, such as the balance of risk and return, the resistance to extreme loss, and the interpretability of strategies, which limit the application of DL-based strategies in real-life financial markets. In this work, we propose AlphaStock, a novel reinforcement learning (RL) based investment strategy enhanced by interpretable deep attention networks, to address the above challenges. Our main contributions are summarized as follows: i) We integrate deep attention networks with a Sharpe ratio-oriented reinforcement learning framework to achieve a risk-return balanced investment strategy;ii) We suggest modeling interrelationships among assets to avoid selection bias and develop a cross-asset attention mechanism;iii) To our best knowledge, this work is among the first to offer an interpretable investment strategy using deep reinforcement learning models. The experiments on long-periodic U.S. and Chinese markets demonstrate the effectiveness and robustness of AlphaStock over diverse market states. It turns out that AlphaStock tends to select the stocks as winners with high long-term growth, low volatility, high intrinsic value, and being undervalued recently. Copyright © 2019, The Authors. All rights reserved.

关键词： Strategic planning

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Detection of Picric Acid by Terpy-Based Metallo- Supramolecular Fluorescent Coordination Polymers in Aqueous Media

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Chinese Journal of Chemistry 2017年第4期35卷 447-456页

作者： Zhongyu Ding Hongqing Li Wanqing Gao Yiquan Zhang Chunhua Liu Yuanyuan Zhu School of Chemistry and Chemical Engineering Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices Hefei Anhui 230009 China Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems (NSLSCS) School of Physical Science and Technology Nanjing Normal University Nanjing Jiangsu 210023 China

The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1 ： 1 complexation of Zn^2＋ and Cd^2＋ ions with ditopic terpyridine ligand was reported. The dispersibility of P1 and P2 was significantly improved in organic solvent and water through the introduction of hydrophilic oligo-ethyoxy side chain. Two polymers displayed yellow light emission both in solution and the solid state due to the intra-ligand charge transfer （ILCT） between the d^10 metal ions and the conjugated spacer unit. These coordination polymers were explored as fluorescent chemosensors for detecting picric acid in aqueous media, displaying high sensitivity and good selectivity. In addition, test strips were prepared from these polymers and exhibited the practical potential of detecting the NACs pollutants in the outdoor water for public safety and security.

关键词： coordination polymer fluorescent chemosensors nitroaromatic explosives picric acid aqueous media

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Rotation sensing in two coupled whispering-gallery-mode resonators with loss and gain

arXiv

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arXiv 2019年

作者： Tian, T. Wang, Zhihai Song, L.J. School of Science Changchun University Changchun130022 China Key Laboratory of Materials Design and Quantum Simulation Changchun University Changchun130022 China Center for Quantum Sciences School of Physics Northeast Normal University Changchun130024 China Center for Advanced Optoelectronic Functional Materials Research Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun130024 China Jilin Engineering Normal University Changchun130052 China

We theoretically propose a scheme to realize the rotation sensing based on two coupled whispering-gallery-mode resonators system with the active resonantor being rotated while the passive one being stationary. We show that the rotation induced Sagnac effect will shift the eigen-frequency of the supermodes. We can measure the average photon number in the steady state or the fluctuation spectrum of the output field to detect the angular velocity of the rotation. We hope that our investigation will be useful in the designing of quantum gyroscope based on spinning resonators. Copyright © 2019, The Authors. All rights reserved.

关键词： Rotation

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Control of Stray Currents in Pipeline System based on Melnikov Theory 36

Control of Stray Currents in Pipeline System based on Melnik...

引用

第36届中国控制会议

作者： Peng Wang Bohu Li Guoqiang Shi Junhua Zhou School of Automation Science and Electrical Engineering BeiHang University Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Science and Technology on Space System Simulation Laboratory Beijing Simulation Center

ISBN: (纸本)9781538629185

The pipeline network interfered by the stray currents has been verified to be a complex nonlinear dynamical *** paper shows that the chaotic characteristic could be utilized in the stray currents *** prove this,this paper establishes an equivalent chaotic control *** we analyze this model by using Melnikov method and find out the condition under which the chaotic phenomenon will be *** order to get a sufficient proof for identifying the conclusion,simulation experiments are used to verify the validity of the control method.

关键词： stray currents chaos control Melnikov

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Effect of Si Content on Melt Infiltration Method of SiCf/SiC-Ti3SiC2

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IOP Conference Series: Materials science and Engineering 2019年第1期678卷

作者： Y R Zhou J Jiao Z Y Jiang X X Lv R Yang Z Qi National Key Laboratory of Advanced Composites AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials AECC Beijing Institute of Aeronautical Materials Beijing 100095 China

SiCf/SiC composites have attracted wide attention as thermo-structural materials owing to its extraordinary properties at elevated temperature. To further improve the toughness of SiCf/SiC, Ti3SiC2 is used as the reinforcement of SiC matrix. In this study, the effect of Si content on the formation of Ti3SiC2 was discussed. The melt Si infiltration method was used to prepare the SiC matrix, whichTi3SiC2phase was in-situ formed from the reaction between TiC, C and Si during the infiltration process. X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were determined to characterize the phase constitution and microstructure of the matrix. The results demonstrate that the synthesis of Ti3SiC2 was depended on the amount of Si during the molten Si infiltration. The small amount of Si could resulted in the incomplete infiltration reaction. TiSi2 was obtained at the presence of excessive Si. Thus appropriate amount of Si promotes the formation of Ti3SiC2 and improves the purity.

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Influence of rolling modes and the level of accumulated deformation on the mechanical and plastic properties of stainless austenitic steel AISI 304L

引用

IOP Conference Series: Materials science and Engineering 2020年第1期1008卷

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

The paper presents the results of studies of rolling modes (direct, reverse, cross ones) at 500°C for samples of stainless steel AISI 304L and their influence on mechanical and plastic properties of the material. The stress-strain state was investigated using a numerical simulation program and the deformation parameters of processing were established. The mechanical properties were studied by microhardness measuring and tensile testing methods. The results of the experiment were analyzed and discussed, and conclusions were drawn. The regularities of the effect of strength parameters depending on the modes of processing and accumulated deformation during rolling have been established.

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Cylindrical vector beam-excited frequency-tunable second harmonic generation in a plasmonic octamer

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Photonics Research 2018年第3期6卷 157-161页

作者： FAJUN XIAO WUYUN SHANG WEIREN ZHU LEI HAN MALIN PREMARATNE TING MEI JIANLIN ZHAO MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of ScienceNorthwestern Polytechnical UniversityXi'an 710129China Department of Electronic Engineering Shanghai Jiao Tong UniversityShanghai 200240China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems Monash UniversityClaytonVlC 3800Australia

We report a method to tune the second harmonic generation(SHG) frequency of a metallic octamer by employing cylindrical vector beams as the excitation. Our method exploits the ability to spatially match the polarization state of excitations with the fundamental target plasmonic modes, enabling flexible control of the SHG resonant *** is found that SHG of the octamer is enhanced over a broad band(400 nm) by changing the excitation from the linearly polarized Gaussian beam to radially and azimuthally polarized beams. More strikingly, when subjected to an azimuthally polarized beam, the SHG intensity of the octamer becomes 30 times stronger than that for the linearly polarized beam even in the presence of Fano resonance.

关键词： SHG Cylindrical vector beam-excited frequency-tunable second harmonic generation in a plasmonic octamer

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Deformation and fracture of long term creep of notched specimen of a single crystal nickel base super alloy 14

Deformation and fracture of long term creep of notched speci...

引用

14th International Conference on Fracture, ICF 2017

作者： Li, Ying Zhang, Ming Zong, Bin Yu, Hui-Chen Aviation Key Laboratory of Science and Technology on Aeronautical Materials and Evaluation Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing100095 China

Creep rupture life behavior of a nickel base superalloy of DZ125 was studied with respect to specimens with different notch shape under elevated temperature of *** result showed that the specimen with notch in the gauge length had a substantially longer life than that of specimen without notch, the bigger the stress concentration factor of Kt is, the longer creep rupture life the specimen exhibited. The SEM observation and analysis on the fractured specimen after text showed that microholes resulting in the damage of the specimen originated mostly from the central portion or portion other than boundary. Analysis was made of the stress distribution of the specimen with different shapes during test, based on which the stress rupture life of the specimen with different Kt values was normalized and a good consistency was found among the stress rupture life. © 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.

关键词： Stress concentration

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Electrochemical Deposition of a Single-Crystalline Nanorod Polycyclic Aromatic Hydrocarbon Film with Efficient Charge and Exciton Transport

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Angewandte Chemie 2021年第13期134卷

作者： Dr. Cheng Zeng Dr. Wenhao Zheng Prof. Dr. Hong Xu Dr. Silvio Osella Dr. Wei Ma Dr. Hai I. Wang Dr. Zijie Qiu Dr. Ken-ichi Otake Prof. Dr. Wencai Ren Prof. Dr. Huiming Cheng Prof. Dr. Klaus Müllen Prof. Dr. Mischa Bonn Prof. Dr. Cheng Gu Prof. Dr. Yuguang Ma State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou 510640 P. R. China Max Planck Institute for Polymer Research Ackermannweg 10 55122 Mainz Germany Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 P. R. China Chemical and Biological Systems Simulation Lab Center of New Technologies University of Warsaw Banacha 2C 02-097 Warsaw Poland Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 P. R. China Institute for Integrated Cell-Material Sciences Institute for Advanced Study Kyoto University Kyoto 606-8501 Japan Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou 510640 P. R. China

Electrochemical deposition has emerged as an efficient technique for preparing conjugated polymer films on electrodes. However, this method encounters difficulties in synthesizing crystalline products and controlling their orientation on electrodes. Here we report electrochemical film deposition of a large polycyclic aromatic hydrocarbon. The film is composed of single-crystalline nanorods, in which the molecules adopt a cofacial stacking arrangement along the π–π direction. Film thickness and crystal size can be controlled by electrochemical conditions such as scan rate and electrolyte species, while the choice of anode material determines crystal orientation. The film supports exceptionally efficient migration of both free carriers and excitons: the free carrier mobility reaches over 30 cm 2 V −1 s −1 , whereas the excitons are delocalized with a low binding energy of 118.5 meV and a remarkable exciton diffusion length of 45 nm.

关键词： carrier and exciton migration electrochemical deposition organic single crystal orientation control thin films

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