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Satellite mission planning for moving targets observation via data driven approach

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Satellite mission planning for moving targets observation vi...

第三十八届中国控制会议

作者： Xin Wen Mingmin Liu Qinglei Hu School of Automation Science and Electrical Engineering Beihang University Shanghai Aerospace Control Technology Institute Beijing Advanced Innovation Center for Big-Data Based Precision Medicine Beihang University

Satellite mission planning is an important premise for earth observation. Traditional satellite mission planning is mainly aimed at fixed ground targets, which cannot meet the increasingly complex mission requirements. This paper considers the moving target observation, and puts forward a method of satellite mission planning via data driven approach. This method forecasts the future track and position information of the moving target through a modified Long Short-Term Memory(M-LSTM) networks algorithm, and proposes a Constraint Satisfaction Genetic Algorithm(CSGA) to plan the missions of moving target observation based on the results of M-LSTM algorithm. In view of the complexity of the constraint and task conflict in the moving target observation, CSGA embeds the constraints into the genetic algorithm through conditional forms, and a conflict resolution operator is designed in CSGA to resolve task conflicts. Simulation results demonstrate the efficiency of the LSTM-CSGA method to solve the mission planning and get a higher observation accuracy.

关键词： Moving target observation mission planning Long Short-Term Memory networks Constraint Satisfaction Genetic Algorithm

Sending-or-not-sending twin-filed quantum key distribution with discrete phase modulation

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arXiv 2020年

作者： Jiang, Cong Yu, Zong-Wen Hu, Xiao-Long Wang, Xiang-Bin Jinan Institute of Quantum technology SAICT Jinan250101 China State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China Data Communication Science and Technology Research Institute Beijing100191 China Shenzhen Institute for Quantum Science and Engineering Physics Department Southern University of Science and Technology Shenzhen518055 China

We study the sending-or-not-sending (SNS) protocol with discrete phase modulation of coherent states. We first make the security of the SNS protocol with discrete phase modulation. We then present analytic formulas for key rate calculation. We take numerical simulations for the key rate through discrete phase modulation of both the original SNS protocol and the SNS protocol with two way classical communications of active-odd-parity pairing (AOPP). Our numerical simulation results show that only with 6 phase values, the key rates of the SNS protocol can exceed the linear bound, and with 12 phase values, the key rates are very close to the results of the SNS protocol with continuously modulated phase-randomization. Copyright © 2020, The Authors. All rights reserved.

关键词： Phase modulation

Graphene Mediates Charge Transfer between Lead Chromate and a Cobalt Cubane Cocatalyst for Photocatalytic Water Oxidation

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Angewandte Chemie 2023年第21期135卷

作者： Wenchao Jiang Lingcong Zhang Chenwei Ni Ming Shi Yue Zhao Yuting Deng Haibo Chi Ruotian Chen Prof. Xiuli Wang Prof. Rengui Li Prof. Can Li School of Chemistry and Materials Science University of Science and Technology of China 230026 Hefei China State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian China Contribution: Data curation (lead) Formal analysis (lead) Investigation (lead) Writing - original draft (lead) Writing - review & editing (lead) University of Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering 100049 Beijing China Contribution: Formal analysis (supporting) Contribution: Formal analysis (lead) Funding acquisition (lead) Investigation (equal) Writing - original draft (lead) Writing - review & editing (lead)

The interfacial barrier of charge transfer from semiconductors to cocatalysts means that the photogenerated charges cannot be fully utilized, especially for the challenging water oxidation reaction. Using cobalt cubane molecules (Co 4 O 4 ) as water oxidation cocatalysts, we rationally assembled partially oxidized graphene (pGO), acting as a charge-transfer mediator, on the hole-accumulating {−101} facets of lead chromate (PbCrO 4 ) crystal. The assembled pGO enables preferable immobilization of Co 4 O 4 molecules on the {−101} facets of the PbCrO 4 crystal, which is favorable for the photogenerated holes transferring from PbCrO 4 to Co 4 O 4 molecules. The surface charge-transfer efficiency of PbCrO 4 was boosted by selective assembly of pGO between PbCrO 4 and Co 4 O 4 molecules. An apparent quantum efficiency for photocatalytic water oxidation on the Co 4 O 4 /pGO/PbCrO 4 photocatalyst exceeded 10 % at 500 nm. This strategy of rationally assembling charge-transfer mediator provides a feasible method for acceleration of charge transfer and utilization in semiconductor photocatalysis.

关键词： Charge-Transfer Mediator Lead Chromate Photocatalysis Spatial Charge Separation Water Oxidation Cocatalysts

Higher key rate of measurement-device-independent quantum key distribution through joint data processing

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arXiv 2020年

We propose a method named as double-scanning method, to improve the key rate of measurement-device-independent quantum key distribution (MDI-QKD) drastically. In the method, two parameters are scanned simultaneously to tightened estimate the counts of single-photon pairs and the phase-flip error rate jointly. Numerical results show that the method in this work can improve the key rate by 50% − 250% in a typical experimental set-up. Besides, we study the optimization of MDI-QKD protocol with all parameters including the source parameters and failure probability parameters, over symmetric channel or asymmetric channel. Numerical results show that compared with the optimized results with only the source parameters, the all-parameter-optimization method could improve the key rate by about 10%. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum cryptography

Correction: The Effect of Co-Culture of Two Coral Species on Their Bacterial Composition Under Captive Environments

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Marine biotechnology (New York, N.Y.) 2022年第6期24卷 1176页

作者： Keigo Ide Yoshikatsu Nakano Michihiro Ito Yohei Nishikawa Hiroyuki Fujimura Haruko Takeyama Department of Life Science and Medical Bioscience Waseda University Tokyo Japan. Computational Bio Big-Data Open Innovation Laboratory (CBBD-OIL) National Institute of Advanced Industrial Science and Technology Tokyo Japan. Tropical Biosphere Research Center University of the Ryukyus Tokyo Japan. Marine Science Section Research Support Division Okinawa Institute of Science and Technology Graduate University Okinawa Japan. Research Organization for Nano and Life Innovation Waseda University Tokyo Japan. Department of Chemistry Biology and Marine Science University of the Ryukyus Okinawa Japan. Department of Life Science and Medical Bioscience Waseda University Tokyo Japan. haruko-takeyama@waseda.jp. Computational Bio Big-Data Open Innovation Laboratory (CBBD-OIL) National Institute of Advanced Industrial Science and Technology Tokyo Japan. haruko-takeyama@waseda.jp. Research Organization for Nano and Life Innovation Waseda University Tokyo Japan. haruko-takeyama@waseda.jp. Institute for Advanced Research of Biosystem Dynamics Waseda Research Institute for Science and Engineering Tokyo Japan. haruko-takeyama@waseda.jp.

Periodically Interrupting Bonding Behavior to Reformat Delocalized Electronic States of Graphdiyne for Improved Electrocatalytic Hydrogen Evolution

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Angewandte Chemie 2022年第42期134卷

作者： Kaikai Ma Jing Wu Xin Wang Yu Sun Zhaozhao Xiong Fulong Dai Haokun Bai Yong Xie Zhuo Kang Yue Zhang Academy for Advanced Interdisciplinary Science and Technology Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 P. R. China Beijing Key Laboratory for Advanced Energy Materials and Technologies School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 P. R. China Contribution: Conceptualization (lead) Data curation (lead) Formal analysis (lead) Funding acquisition (lead) Investigation (lead) Methodology (lead) Project administration (lead) Contribution: Conceptualization (lead) Data curation (lead) Funding acquisition (lead) Investigation (lead) Methodology (lead) Project administration (lead) Resources (lead) Software (lead) Supervision (lead)

π electron configuration plays a pivotal role in metal-free carbon catalysts, and its delocalization degree overwhelmingly dominates catalytic activity. However, precise and targeted regulation of inherent π electrons still remain challenging. Here, one chemical-bond-targeted physical clipping strategy is proposed and effectively adopted in the cutting-edge carbon material system of graphdiyne (GDY) as a concept-of-proof. The delocalized electrons are expected to be periodically reformatted for substantially enhancing π electron delocalization. Via theoretical screening and well-designed experiments, periodical interruption of Csp−Csp 2 bonds in GDY can render sp−C sites with decent activity, ultimately yielding top-ranking electrocatalytic performance without intentionally introducing external decoration. The as-proposed concept endows a universal prescription to push the limit of delocalization degree, thus shedding novel light on the rational design of decent metal-free catalysts.

关键词： Bonding Behavior Delocalization Degree Graphdiyne Hydrogen Evolution π Electron State

Fault-tolerant coherent H∞ control for linear quantum systems

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arXiv 2020年

作者： Liu, Yanan Dong, Daoyi Petersen, Ian R. Gao, Qing Ding, Steven X. Yokoyama, Shota Yonezawa, Hidehiro School of Engineering and Information Technology University of New South Wales CanberraACT2600 Australia Center for Quantum Computation and Communication Technology Australian Research Council CanberraACT2600 Australia University of Duisburg-Essen Duisburg47057 Germany Research School of Electrical Energy and Materials Engineering Australian National University CanberraACT2601 Australia School of Automation Science and Electrical Engineering State Key Laboratory of Software Development Environment Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing100191 China

Robustness and reliability are two key requirements for developing practical quantum control systems. The purpose of this paper is to design a coherent feedback controller for a class of linear quantum systems suffering from Markovian jumping faults so that the closed-loop quantum system has both fault tolerance and H∞ disturbance attenuation performance. This paper first extends the physical realization conditions from the time-invariant case to the time-varying case for linear stochastic quantum systems. By relating the fault tolerant H∞ control problem to the dissipation properties and the solutions of Riccati differential equations, an H∞ controller for the quantum system is then designed by solving a set of linear matrix inequalities (LMIs). In particular, an algorithm is employed to introduce additional noises and to construct the corresponding input matrices to ensure the physical realizability of the quantum controller. For real applications of the developed fault-tolerant control strategy, we present a linear quantum system example from quantum optics, where the amplitude of the pumping field randomly jumps among different values. It is demonstrated that a quantum H∞ controller can be designed and implemented using some basic optical components to achieve the desired control goal. Copyright © 2020, The Authors. All rights reserved.

关键词： Controllers

Unveiling the secrets of the mid-infrared Moon

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arXiv 2020年

作者： Wu, Yunzhao Jin, Qi Li, Cui Xu, Tianyi Qi, Wenwen Tan, Wei Li, Xiaoman Shi, Zhicheng He, Hongyan Dai, Shuwu Li, Guo Liu, Fengjing Wang, Jingqiao Wang, Xiaoyan Lu, Yu Cai, Wei Wang, Qi Meng, Lingjie Key Laboratory of Planetary Sciences Purple Mountain Observatory Chinese Academy of Sciences Nanjing210034 China Space Science Institute Macau University of Science and Technology Macau China Cas Center for Excellence in Comparative Planetology China Beijing Institute of Space Mechanics and Electricity Beijing China Beijing Institute of Spacecraft System Engineering Beijing China China Centre for Resources Satellite Data and Application Beijing China Jiangsu Ctr. for Collab. Innovation in Geographical Information Resource Development and Application Nanjing210023 China Earth Observation System and Data Center China National Space Administration Beijing China

The Moon's optical characteristics in visible and long-wavelength infrared (LWIR) have long been observed with our eyes or with instruments. What the mid-infrared (MIR) Moon looks like is still a mystery. For the first time we present detailed appearance of the MIR Moon observed by a high-resolution geostationary satellite and reveal the essence behind its appearance. The appearance of the MIR Moon is opposite to its normal visible appearance. In addition the MIR Moon shows limb darkening. Both the absolute and the relative brightness distribution of the MIR lunar disk changes with the solar incidence angle. The signatures of the MIR Moon are controlled by both the reflection and emission of the lunar surface. We also show first-ever brightness temperature maps of the lunar disk without needing a mosaic, which better show the temperature variation across the lunar disk. They reveal that the relationship between brightness temperature and solar incidence angle i is cos1/bi, and the power parameter is smaller than the Lambertian temperature model of cos1/4i observed for lunar orbit-based measurements. The slower decrease of the brightness temperature when moving away from the sub-solar point than the Lambertian model is due to topographic effects. The brightness temperature is dominated by albedo and the solar incidence angle and influenced by the topography. Our results indicate that the Moon in the MIR exhibits many interesting phenomena which were previously unknown, and contains abundant information about lunar reflection and thermal emission for future study. Copyright © 2020, The Authors. All rights reserved.

关键词： Infrared devices

A threshold effect of coupling delays on intra-layer synchronization in duplex networks

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science China(Technological sciences) 2018年第12期61卷 1907-1914页

作者： TANG LongKun LU JunAn Lü JinHu Fujian Province University Key Laboratory of Computation Science School of Mathematical Sciences Huaqiao University Department of Mathematics & Statistics Georgia State University School of Mathematics and Statistics Wuhan University School of Automation Science and Electrical Engineering State Key Laboratory of Software Development Environment and Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University

This paper investigates the impact of inter-layer coupling functions and intra-layer coupling delays on intra-layer synchronization regions and sychronizability. It is found that the inter-layer coupling functions have great influence on intra-layer synchronization regions, as well as on the intra-layer synchronizability. In particular, there exists an inter-layer coupling function such that the inter-layer coupling strength neither improves nor weakens the intra-layer synchronizability. Furthermore, no matter which one of three inter-layer coupling functions is chosen, a small intra-layer delay always keeps the intra-layer synchronized regions almost unchanged, implying that the small delay neither enhances nor suppresses the intra-layer synchronizability. At the same time the delay greatly frustrates the synchronizability in each layer when it is greater than some threshold. Our results may have potential applications for interconnected technological networks where communication delays are inevitably present.

关键词： multiplex network master stability function intra-layer synchronization synchronized region time delay