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ECSS evolution - Project phasing and reviews in future space projects 69

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ECSS evolution - Project phasing and reviews in future space...

69th International Astronautical Congress: #InvolvingEveryone, IAC 2018

作者： Schiller, Daniel Jegou, Roger Durand-Carrier, Franck Crivellari, Gianni Castanet, Fabien Hulier, Jean-Pierre Knorr, Wolfram Conde, Enrique Gonzalez Deutsches Zentrum fÃ¼r Luft- und Raumfahrt DLR - Space Administration Department for Project Support RD-RU KÃ¶nigswinterer StraÃŸe 522-524 Bonn53227 Germany Keplerlaan 1 PO Box 299 AG NoordwijkNL-2200 Netherlands 18 avenue Edouard Belin Toulouse - CÃ©dex 931401 France Thales Alenia Space Quality Management System - Standardization Internal Audit Processes Coaching and Assessment Thales Alenia Space Italia S.p.A. Strada Antica di Collegno 253 Torino10146 Italy 18 avenue Edouard Belin Toulouse- CÃ©dex 931401 France ArianeGroup Know How and Standards Repository 51-61 Route de Verneuil BP71040 Les Mureaux78131 France Airbus Defence and Space GmbH Project Data Management Germany Engineering - Space Systems Claude-Dornier-StraÃŸe Immenstaad88090 Germany

Space projects were analysed for their best practices, new industry methods and international approaches on how to manage project life-cycle, phasing and reviews. These results were compared with current ECSS (European Cooperation for Space Standardization) approaches to derive items for standardization in general and for improvement of ECSS in particular. ECSS is currently a conservative project framework in its policies, objectives and methods. It aims mainly at single mission space projects performed between space agencies and prime industry suppliers. Today's life-cycle approach in ECSS manages the individual development of a space system, sometimes adapted to recurrent development for a follow-on mission, but lacking modern methods to manage the life-cycle of constellation-programs, series-production or "off-the-shelf" procurement. It is hard to depart from the standards to apply flexible/agile methods or to use desynchronized supplier processes apart from the typical v-model. 36 recommendations for modern phasing/review approaches were identified. They start with correcting factual errors in ECSS and reach as far as to introduce new management, phasing and review concepts in a complete ECSS overhaul. Most of the recommendations are of this latter, "far-reaching" type. Further they do not only deal with technical content, but also with ways to improve ECSS documentation, publication and usability, especially how to draft requirements. To cover all recommendations 3 implementation strategies were developed to improve ECSS in the near term and in the far term, synching them with other on-going activities to improve ECSS. All this is â€œwork in progressâ€¥ within ECSS. This paper outlines the current status and the way forward how ECSS will handle project phasing and reviews in the future. Copyright © 2016 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.

关键词： Life cycle

Combination of first-principles molecular dynamics and XANES simulations for LiCoO2-electrolyte interfacial reactions in a lithium-ion battery

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Physical Review B 2017年第3期96卷 035107-035107页

作者： Tomoyuki Tamura Masanori Kohyama Shuji Ogata Department of Physical Science and Engineering Nagoya Institute of Technology Nagoya 466-8555 Japan Center for Materials Research by Information Integration Research and Services Division of Materials Data and Integrated System National Institute for Materials Science Tsukuba 305-0047 Japan Research Institute of Electrochemical Energy Department of Energy and Environment National Institute of Advanced Industrial Science and Technology Ikeda 563-8577 Japan

We performed a first-principles molecular dynamics (FPMD) simulation of the interfacial reactions between a LiCoO2 electrode and a liquid ethylene carbonate (EC) electrolyte. For configurations during the FPMD simulation, we also performed first-principles Co K-edge x-ray absorption near-edge structure (XANES) simulations, which can properly reproduce the bulk and surface spectra of LiCoO2. We observed strong absorption of an EC molecule on the LiCoO2 {110} surface, involving ring opening of the molecule, bond formation between oxygen atoms in the molecule and surface Co ions, and emission of one surface Li ion, while all the surface Co ions remain Co3+. The surface Co ions having the bond with an oxygen atom in the molecule showed remarkable changes in simulated K-edge spectra which are similar to those of the in situ observation under electrolyte soaking [D. Takamatsu et al., Angew. Chem., Int. Ed. 51, 11597 (2012)]. Thus, the local environmental changes of surface Co ions due to the reactions with an EC molecule can explain the experimental spectrum changes.

关键词： X-ray absorption near-edge spectroscopy

The tianQin project: Current progress on science and technology

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arXiv 2020年

作者： Mei, Jianwei Bai, Yan-Zheng Bao, Jiahui Barausse, Enrico Cai, Lin Canuto, Enrico Cao, Bin Chen, Wei-Ming Chen, Yu Ding, Yan-Wei Duan, Hui-Zong Fan, Huimin Feng, Wen-Fan Fu, Honglin Gao, Qing Gao, TianQuan Gong, Yungui Gou, Xingyu Gu, Chao-Zheng Gu, De-Feng He, Zi-Qi Hendry, Martin Hong, Wei Hu, Xin-Chun Hu, Yi-Ming Hu, Yuexin Huang, Shun-Jia Huang, Xiang-Qing Jiang, Qinghua Jiang, Yuan-Ze Jiang, Yun Jiang, Zhen Jin, Hong-Ming Korol, Valeriya Li, Hong-Yin Li, Ming Li, Ming Li, Pengcheng Li, Rongwang Li, Yuqiang Li, Zhu Li, Zhulian Li, Zhu-Xi Liang, Yu-Rong Liang, Zheng-Cheng Liao, Fang-Jie Liu, Shuai Liu, Yan-Chong Liu, Li Liu, Pei-Bo Liu, Xuhui Liu, Yuan Lu, Xiong-Fei Lu, Yang Lu, Ze-Huang Luo, Yan Luo, Zhi-Cai Milyukov, Vadim Ming, Min Pi, Xiaoyu Qin, Chenggang Qu, Shao-Bo Sesana, Alberto Shao, Chenggang Shi, Changfu Su, Wei Tan, Ding-Yin Tan, Yujie Tan, Zhuangbin Tu, Liang-Cheng Wang, Bin Wang, Cheng-Rui Wang, Fengbin Wang, Guan-Fang Wang, Haitian Wang, Jian Wang, Lijiao Wang, Panpan Wang, Xudong Wang, Yan Wang, Yi-Fan Wei, Ran Wu, Shu-Chao Xiao, Chun-Yu Xu, Xiao-Shi Xue, Chao Yang, Fang-Chao Yang, Liang Yang, Ming-Lin Yang, Shan-Qing Ye, Bobing Yeh, Hsien-Chi Yu, Shenghua Zhai, Dongsheng Zhang, Caishi Zhang, Haitao Zhang, Jian-Dong Zhang, Jie Zhang, Lihua Zhang, Xin Zhang, Xuefeng Zhou, Hao Zhou, Ming-Yue Zhou, Ze-Bing Zhu, Dong-Dong Zi, Tie-Guang Luo, Jun Zhuhai519082 China Centre for Gravitational Experiments School of Physics MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics PGMF Huazhong University of Science and Technology Wuhan430074 China DFH Satellite Co. Ltd. Beijing100094 China Yunnan Observatories Chinese Academy of Sciences Kunming650011 China Beijing Institute of Control Engineering Beijing100094 China Beijing Institute of Spacecraft System Engineering Beijing100094 China SISSA Via Bonomea 265 Trieste34136 Italy INFN Sezione di Trieste IFPU - Institute for Fundamental Physics of the Universe Via Beirut 2 Trieste34014 Italy Former Faculty Politecnico di Torino Corso Duca degli Abruzzi 24 Torino10129 Italy School of Physical Science and Technology Southwest University Chongqing400715 China SUPA School of Physics and Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing100049 China School of Physics and Astronomy University of Birmingham BirminghamB15 2TT United Kingdom Center for High Energy Physics Department of Physics State Key Laboratory of Nuclear Physics and Technology Peking University No.5 Yiheyuan Rd Beijing100871 China Lomonosov Moscow State University Sternberg Astronomical Institute Moscow119992 Russia Dipartimento di Fisica "G. Occhialini" Universitá degli Studi Milano Bicocca Piazza della Scienza 3 MilanoI-20126 Italy School of Aeronautics and Astronautics Shanghai Jiao Tong University Shanghai200240 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China School of Astronomy and Space Science University of Science and Technology of China HefeiAnhui230026 China HannoverD-30167 Germany Leibniz Universität Hannover HannoverD-30167 Germany Department of Physics College of Sci

TianQin is a planned space-based gravitational wave (GW) observatory consisting of three earth orbiting satellites with an orbital radius of about 105 km. The satellites will form a equilateral triangle constellation the plane of which is nearly perpendicular to the ecliptic plane. TianQin aims to detect GWs between 10−4 Hz and 1 Hz that can be generated by a wide variety of important astrophysical and cosmological sources, including the inspiral of Galactic ultra-compact binaries, the inspiral of stellar-mass black hole binaries, extreme mass ratio inspirals, the merger of massive black hole binaries, and possibly the energetic processes in the very early universe or exotic sources such as cosmic strings. In order to start science operations around 2035, a roadmap called the 0123 plan is being used to bring the key technologies of TianQin to maturity, supported by the construction of a series of research facilities on the ground. Two major projects of the 0123 plan are being carried out. In this process, the team has created a new generation 17 cm single-body hollow corner-cube retro-reflector which has been launched with the QueQiao satellite on 21 May 2018;a new laser ranging station equipped with a 1.2 m telescope has been constructed and the station has successfully ranged to all the five retro-reflectors on the Moon;and the TianQin-1 experimental satellite has been launched on 20 December 2019 and the first round result shows that the satellite has exceeded all of its mission requirements. Copyright © 2020, The Authors. All rights reserved.

关键词： Orbits

Finding a junction partner for candidate solar cell absorbers enargite and bournonite from electronic band and lattice matching

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arXiv 2018年

作者： Wallace, Suzanne K. Butler, Keith T. Hinuma, Yoyo Walsh, Aron Department of Chemistry Centre for Sustainable Chemical Technologies University of Bath Claverton Down BathBA2 7AY United Kingdom Department of Materials Imperial College London Exhibition Road LondonSW7 2AZ United Kingdom ISIS Neutron and Muon Source Rutherford Appleton Laboratories Didcot OxfordshireOX11 0QX United Kingdom Center for Frontier Science Chiba University Chiba263-8522 Japan Center for Materials Research by Information Integration Research and Services Division of Materials Data and Integrated System National Institute for Materials Science Tsukuba305-0047 Japan Department of Materials Science and Engineering Yonsei University Seoul03722 Korea Republic of

An essential step in the development of a new photovoltaic (PV) technology is choosing appropriate electron and hole extraction layers to make an efficient device. We recently proposed the minerals enargite (Cu3AsS4) and bournonite (CuPbSbS3) as materials that are chemically stable with desirable optoelectronic properties for use as the absorber layer in a thin-film PV device. For these compounds, spontaneous lattice polarization with internal electric fields - and potential ferroelectricity - may allow for enhanced carrier separation and novel photophysical effects. In this work, we calculate the ionization potentials for non-polar surface terminations and propose suitable partners for forming solar cell heterojunctions by matching the electronic band edges to a set of candidate electrical contact materials. We then further screen these candidates by matching the lattice constants and identify those that are likely to minimise strain and achieve epitaxy. This two-step screening procedure identified a range of unconventional candidate contact materials including SnS2, ZnTe, WO3, and Bi2O3. Copyright © 2018, The Authors. All rights reserved.

关键词： Copper compounds

On the H2 norm and iterative model order reduction of linear switched systems

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arXiv 2017年

作者： Gosea, Ion Victor Antoulas, Athanasios C. Data-Driven System Reduction and Identification Group Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg Germany Department of Electrical and Computer Engineering Rice University Houston United States MPI Magdeburg Germany Baylor College of Medicine Houston United States

A new definition of the H2 norm for linear switched systems is introduced. It is based on appropriately defined time-domain kernels, or equivalently, on infinite controllability and observability Gramian matrices. Furthermore, an extension of the iterative rational Krylov algorithm to the class of linear switched systems is proposed.93A15, 93A30, 93B05, 93B07, 93B11, 93C10, 93C15 Copyright © 2017, The Authors. All rights reserved.

关键词： Iterative methods

Approximation of a damped Euler-Bernoulli beam model in the Loewner framework

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arXiv 2017年

作者： Gosea, I.V. Antoulas, A.C. Data-Driven System Reduction and Identification Group Max Planck Institute for Dynamics of Complex Technical Systems Sandtorstrasse 1 Magdeburg39106 Germany Department of Electrical and Computer Engineering Rice University 6100 Main St MS-366 HoustonTX77005 United States

The Loewner framework for model order reduction is applied to the class of infinite-dimension systems. The transfer function of such systems is irrational (as opposed to linear systems, whose transfer function is rational) and can be expressed as an infinite series of rational functions. The main advantage of the method is the fact that reduced orders models are constructed using only input-output measurements. The procedure can be directly applied to the original transfer function or to the one obtained from the finite element discretization of the PDE. Significantly better results are obtained when using it directly, as it is presented in the experiments section.93A30, 93B15, 93C15, 93C20 Copyright © 2017, The Authors. All rights reserved.

关键词： Transfer functions

Bayesian Spectroscopy with a Replica Exchange Monte Carlo Method on an Excitonic Absorption Spectrum of a Cu2O Thin Crystal

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Journal of Physics: Conference Series 2019年第1期1220卷

作者： Kazunori Iwamitsu Masato Okada Ichiro Akai Faculty of Science Kumamoto University 2-39-1 Kurokami Chuo-ku Kumamoto 860-8555 Japan. Department of Complexity Science and Engineering The University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba 277-8561 Japan. Research and Service Division of Materials Data and Integrated System National Institute for Material Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan. Institute of Pulsed Power Science Kumamoto University 2-39-1 Kurokami Chuo-ku Kumamoto 860-8555 Japan.

To study a bi-axial stress effect in a Cu2O thin crystal sandwiched by paired MgO substrates, we have applied Bayesian spectroscopy to decompose an absorption spectrum with employing a replica exchange Monte Carlo (RXMC) method. The absorption spectrum includes broad bands of an inter-band transition and an exciton continuous state simultaneously with excitonic resonance transitions. However, it had been difficult to decompose correctly because of a bottleneck in optimal solution search efficiency. To relieve the bottleneck, we introduced the RXMC method and succeeded in decomposing all spectral components. Posterior probabilities of the band-gap energy and the exciton binding energy distribute at lower energy side than those in stress-free bulk crystals, which provides statistical evidence to show that the bi-axial stress remains in the Cu2O thin crystal sandwiched by MgO substrates.

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Is the winner really the best? A critical analysis of common research practice in biomedical image analysis competitions

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arXiv 2018年

作者： Maier-Hein, Lena Eisenmann, Matthias Reinke, Annika Onogur, Sinan Stankovic, Marko Scholz, Patrick Arbel, Tal Bogunovic, Hrvoje Bradley, Andrew P. Carass, Aaron Carolin Feldmann Frangi, Alejandro F. Ful, Peter M. van Ginneken, Bram Hanbury, Allan Honauer, Katrin Kozubek, Michal Landman, Bennett A. Marz, Keno Maier, Oskar Maier-Hein, Klaus Menze, Bjoern H. Müller, Henning Neher, Peter F. Niessen, Wiro Rajpoot, Nasir Sharp, Gregory C. Sirinukunwattana, Korsuk Speidel, Stefanie Stock, Christian Stoyanov, Danail Taha, Abdel Aziz van der Sommen, Fons Wang, Ching-Wei Weber, Marc-André Zheng, Guoyan Jannin, Pierre Kopp-Schneider, Annette Heidelberg Germany Centre for Intelligent Machines McGill University MontrealQC Canada Christian Doppler Laboratory for Ophthalmic Image Analysis Department of Ophthalmology Medical University Vienna Vienna Austria Science and Engineering Faculty Queensland University of Technology BrisbaneQLD Australia Department of Electrical and Computer Engineering Department of Computer Science Johns Hopkins University Baltimore United States CISTIB Centre for Computational Imaging and Simulation Technologies in Biomedicine University of Sheffield Sheffield United Kingdom Department of Radiology and Nuclear Medicine Medical Image Analysis Radboud University Center Nijmegen Netherlands Institute of Information Systems Engineering TU Wien Vienna Austria Heidelberg University Heidelberg Germany Centre for Biomedical Image Analysis Masaryk University Brno Czech Republic Electrical Engineering Vanderbilt University NashvilleTN United States Institute of Medical Informatics Universität zu Lübeck Lübeck Germany Heidelberg Germany Institute for Advanced Studies Department of Informatics Technical University of Munich Munich Germany Information System Institute HES-SO Sierre Switzerland Departments of Radiology Nuclear Medicine and Medical Informatics Erasmus MC Rotterdam Netherlands Department of Computer Science University of Warwick Coventry United Kingdom Department of Radiation Oncology Massachusetts General Hospital BostonMA United States Institute of Biomedical Engineering University of Oxford Oxford United Kingdom National Center for Tumor Diseases Dresden Dresden Germany Heidelberg Germany Department of Computer Science University College London London United Kingdom Data Science Studio Research Studios Austria FG Vienna Austria Department of Electrical Engineering Eindhoven University of Technology Eindhoven Netherlands AIExplore NTUST Center of Computer Vision and Medical Imaging Graduate Institute of Biomedical Engineering National Ta

International challenges have become the standard for validation of biomedical image analysis methods. Given their scientific impact, it is surprising that a critical analysis of common practices related to the organization of challenges has not yet been performed. In this paper, we present a comprehensive analysis of biomedical image analysis challenges conducted up to now. We demonstrate the importance of challenges and show that the lack of quality control has critical consequences. First, reproducibility and interpretation of the results is often hampered as only a fraction of relevant information is typically provided. Second, the rank of an algorithm is generally not robust to a number of variables such as the test data used for validation, the ranking scheme applied and the observers that make the reference annotations. To overcome these problems, we recommend best practice guidelines and define open research questions to be addressed in the future. Copyright © 2018, The Authors. All rights reserved.

关键词： Quality control

Ab initio thermodynamic properties of certain compounds in Nd-Fe-B system

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arXiv 2018年

作者： Hanindriyo, Adie Tri Sridar, Soumya Hari Kumar, K.C. Hongo, Kenta Maezono, Ryo School of Material Science Jaist Asahidai 1-1 Nomi Ishikawa923-1292 Japan Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai600 036 India Computational Engineering Applications Unit RIKEN 2-1 Hirosawa Wako Saitama351-0198 Research Center for Advanced Computing Infrastructure Jaist Asahidai 1-1 Nomi Ishikawa923-1292 Japan Center for Materials Research by Information Integration Research and Services Division of Materials Data and Integrated System National Institute for Materials Science Tsukuba305-0047 Japan Presto Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi-shi Saitama332-0012 Japan School of Information Science Jaist Asahidai 1-1 Nomi Ishikawa923-1292 Japan

In this work, we report the results of ab initio calculations of thermochemical properties of several compounds in the Fe-Nd, B-Nd and B-Fe-Nd systems. We have performed DFT+U calculations to compute the enthalpy of formation of the compounds NdB6, NdB4, Nd2B5, Nd2Fe17and Nd5Fe2B6. It was found that the values obtained with an effective Hubbard U correction have better agreement with the experimental data. We have also computed the vibrational contribution to the heat capacity (Cp) of the compounds as a function of temperature was computed using the quasharmonic approximation. For most of the compounds these properties have not been experimentally determined until now. Hence, the computed ab initio thermodynamic properties will serve as useful input for the Gibbs energy model parameter assessment using the CALPHAD method. Copyright © 2018, The Authors. All rights reserved.

关键词： Iron alloys