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All-sky search for continuous gravitational waves from isolated neutron stars in the early O3 LIGO data

Physical Review D 2021年第8期104卷 082004-082004页

作者： R. Abbott T. D. Abbott S. Abraham F. Acernese K. Ackley A. Adams C. Adams R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith T. Akutsu K. M. Aleman G. Allen A. Allocca P. A. Altin A. Amato S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando S. V. Angelova S. Ansoldi J. M. Antelis S. Antier S. Appert Koya Arai Koji Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud S. M. Aronson H. Asada Y. Asali G. Ashton Y. Aso S. M. Aston P. Astone F. Aubin P. Aufmuth K. AultONeal C. Austin S. Babak F. Badaracco M. K. M. Bader S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer M. Bals A. Balsamo G. Baltus S. Banagiri D. Bankar R. S. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal M. G. Benjamin T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi D. Bersanetti A. Bertolini J. Betzwieser R. Bhandare A. V. Bhandari D. Bhattacharjee S. Bhaumik J. Bidler I. A. Bilenko G. Billingsley R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn J. Blackman C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant A. Buikema T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic R. L. Byer L. Cadonati M. Caesar G. Cagnoli C. Cahillane H. W. Cain, III J. Calderón Bustillo J. LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S.Angelo I-80126 Napoli Italy OzGrav School of Physics and Astronomy Monash University Clayton 3800 Victoria Australia Christopher Newport University Newport News Virginia 23606 USA LIGO Livingston Observatory Livingston Louisiana 70754 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom Gran Sasso Science Institute (GSSI) I-67100 L’Aquila Italy INFN Laboratori Nazionali del Gran Sasso I-67100 Assergi Italy INFN Sezione di Pisa I-56127 Pisa Italy Università di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan California State University Fullerton Fullerton California 92831 USA NCSA University of Illi

We report on an all-sky search for continuous gravitational waves in the frequency band 20–2000 Hz and with a frequency time derivative in the range of [−1.0,+0.1]×10−8 Hz/s. Such a signal could be produced by a nearby, spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the LIGO data from the first six months of Advanced LIGO’s and Advanced Virgo’s third observational run, O3. No periodic gravitational wave signals are observed, and 95% confidence-level (C.L.) frequentist upper limits are placed on their strengths. The lowest upper limits on worst-case (linearly polarized) strain amplitude h0 are ∼1.7×10−25 near 200 Hz. For a circularly polarized source (most favorable orientation), the lowest upper limits are ∼6.3×10−26. These strict frequentist upper limits refer to all sky locations and the entire range of frequency derivative values. For a population-averaged ensemble of sky locations and stellar orientations, the lowest 95% C.L. upper limits on the strain amplitude are ∼1.4×10−25. These upper limits improve upon our previously published all-sky results, with the greatest improvement (factor of ∼2) seen at higher frequencies, in part because quantum squeezing has dramatically improved the detector noise level relative to the second observational run, O2. These limits are the most constraining to date over most of the parameter space searched.

关键词： Astrophysical studies of gravity Gravitational wave detection Gravitational wave sources Gravitational waves

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Weighted Consensus of Multi-Agent Systems Using both Time-delay State and Current State 35

Weighted Consensus of Multi-Agent Systems Using both Time-de...

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第35届中国控制会议

作者： He Ying-gao Wang Xiang-yu Wuxi Institute of Arts & Technology School of Automation Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education

ISBN: (纸本)9781509009107

This paper investigates consensus of continuous-time multi-agent system through adjusting the proportion of the current state and time-delay state in the control algorithm,supposing that its topology is fixed and a directed interconnection graph which contains a spanning tree.A sufficient condition for the convergence to a consensus is proposed and proved based on the generalized Nyquist stability criterion and the Gerschgorin disk theorem.A method is found to enlarge upper bound on the maximum time-delay,numerical simulations are shown to demonstrate the validity of the achieved theoretical results.

关键词： multi-agent system weighted consensus Nyquist criterion Gerschgorin disk theorem

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Room temperature continuous-wave excited biexciton emission in CsPbBr3 nanocrystals

arXiv

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arXiv 2018年

作者： Chen, Jie Zhang, Qing Du, Wenna Mi, Yang Shang, Qiuyu Shi, Jia Liu, Pengchong Sui, Xinyu Wu, Xianxin Wang, Rui Peng, Bo Zhong, Haizheng Xing, Guichuan Qiu, Xiaohui Sum, Tze Chien Liu, Xinfeng Division of Nanophotonics CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100190 China University of Chinese Academy of Sciences 19 A Yuquan Rd Shijingshan District Beijing100049 China Department of Materials Science and Engineering College of Engineering Peking University Beijing100871 China Research Center for Wide Band Semiconductor Peking University China National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science & Engineering Beijing Institute of Technology China Institute of Applied Physics and Materials Engineering University of Macau China School of Physical & Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore

Biexcitons are a manifestation of many-body excitonic interactions crucial for quantum information and quantum computation in the construction of coherent combinations of quantum states. However, due to their small binding energy and low transition efficiency, most biexcitons in conventional semiconductors exist either at cryogenic temperature or under femtosecond pulse laser excitation. Here we demonstrate room temperature, continuous wave driven biexciton states in CsPbBr3 perovskite nanocrystals through coupling with a plasmonic nanogap. The room temperature CsPbBr3 biexciton excitation fluence (~100 mW/cm2) is reduced by ~1013 times in the Ag nanowire-film nanogaps. The giant enhancement of biexciton emission is driven by coherent biexciton-plasmon Fano interference. These results provide new pathways to develop high efficiency non-blinking single photon sources, entangled light sources and lasers based on biexciton states. Copyright © 2018, The Authors. All rights reserved.

关键词： Cesium compounds

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Constraint test cases generation based on particle swarm optimization 22

Constraint test cases generation based on particle swarm opt...

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22nd ISSAT International Conference on Reliability and Quality in Design

作者： Sheng, Yunlong Wei, Chang'an Wang, Gang Jiang, Shouda Chen, Yinsheng Department of Automatic Test and Control Harbin Institute of Technology Harbin China Department of Communication Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9780991057634

Although Artificial Intelligence (AI)-based algorithms have made some achievements on t-way testing strategies and perform better than greedy algorithms, there still exist a challenging problem in t-way constraint covering arrays generation. Only few AI-based algorithms can handle constraints currently compared with greedy algorithms. In this paper, we first demonstrate two algorith ms to generate a t-way covering array with constraints based on particle swarm optimization. Particle swarm-based Constraints Test Generator with Avoiding strategy (PCTG-Av) uses the strategy of avoiding the selection of conflicting test cases. It selects the optimal particle which satisfies the constraint validity as the global solution after per iteration, and guides the evolutionary direction. Particle swarm-based Constraints Test Generator with Replacing strategy (PCTG-Re) uses the strategy of replacing conflicting test cases. PCTG-Re verifies the constraint validity of the global optimal solution after the iteration process. If the global optimal solution doesn't satisfy the constraint validity, then replace the parameter values related to conflicting. Finally we evaluate the availability of the two approaches with some excellent existing strategies. The results show that our algorithms have considerable competitiveness. © 2016, International Society of Science and Applied Technologies. All rights reserved.

关键词： Constraint handling

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Embedded linear model predictive control for 8-bit microcontrollers via convex lifting

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IFAC-PapersOnLine 2017年第1期50卷 10697-10704页

作者： Gulan M. Takács G. Anh Nguyen N. Olaru S. Rodriguez-Ayerbe P. Rohaľ-Ilkiv B. Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava Námestie slobody 17 Bratislava 812 31 Slovakia Institute for Design and Control of Mechatronical Systems Johannes Kepler University Linz Altenberger Straße 69 Linz A-4040 Austria Laboratory of Signals and Systems CentraleSupélec-CNRS-Univeristé Paris Sud Univeristé Paris-Saclay 3 rue Joliot Curie Gif-sur-Yvette 911 90 France

This paper demonstrates an efficient approach for the implementation of parametric programming solutions to linear model predictive control problems. The emphasis is put namely on embedded hardware applications where feasible size and online evaluation of the controller code can be mission critical. As the explicit solutions are known to become quickly intractable for such a purpose once the amount of problem data grows, we exploit the concept of convex lifting of a given parameter space partition, and use it to avoid its storage and to replace the traditional point location with a significantly less costly procedure. In this light we practically illustrate the deployment of generated code on an 8-bit microcontroller unit, representing the class of low-cost embedded controllers built into mass-produced devices, in an active vibration suppression case study accompanied by a detailed performance, memory and timing analysis. © 2017

关键词： complexity reduction convex lifting explicit solution microcontroller real-time embedded predictive control

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Speed control of Induction Motor Using H∞Linear Parameter Varying controller

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IFAC-PapersOnLine 2016年第25期49卷 74-79页

作者： Pohl, Lukas Vesely, Ivo CEITEC-Central European Institute of Technology Brno University of Technology Purkynova 123 Brno Czech Republic Department of Control and Instrumentation Faculty of Electrical Engineering and Communication Brno University of Technology Technicka 12 Brno Czech Republic

This paper presents H∞LPV approach to speed control of induction motor. Robust controller is designed using hybrid current-flux d-q equations of an induction machine. Rotor speed is taken out from these equations and it is used as a scheduling variable. Resulting control effort is computed as a sum of weighted control efforts of each vertex controller. Weight of each control effort depends on current value of scheduling variable (rotor speed). This method results in less conservative approach to speed controler design. © 2016

关键词： controllers Induction motors Scheduling Speed Speed control Conservative approaches Gain Scheduling Hybrid currents Induction machines Linear parameter varying controllers Robust controllers Scheduling variable Weighted controls

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Recent advances on masticatory robot

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Recent Patents on Mechanical engineering 2016年第3期9卷 184-192页

作者： Jiang, Jingang Han, Yingshuai Zhang, Yongde Yu, Xiaoyang Guo, Xiaowei Robotics & ITS Engineering Research Center Harbin University of Science and Technology Harbin150080 China Intelligent Machine Institute Harbin University of Science and Technology Harbin150080 China School of Measurement-Control Tech and Communications Engineering Harbin University of Science and Technology Harbin150080 China

Background: Masticatory robot is a bionic robot, which is the product of the combination of medical technology and robot technology, to simulate human chewing movement. It can be mainly used for rehabilitation training of patients with occlusal disorders, and detecting the texture of food. Objective: To provide an overview of recent masticatory robots and introduce their respective characteristics and development. Method: This paper reviews various representative patents related to masticatory robot. The structural characteristics, control characteristics, applications of the typical masticatory robots are introduced. Results: The differences of different types of masticatory robots are compared and analyzed, and the structural characteristics are concluded. The main problems in its development are analyzed, the development trend is foreseen, and the current and future research of the patents on masticatory robot is discussed. Conclusion: Masticatory robot has important practical significance, and plays an important role in promoting the technology innovation in medical and food industries. And further improvements are needed in the aspects of authenticity, intelligence and security of the masticatory robot. More patents on masticatory robot should be invented. © 2016 Bentham Science Publishers.

关键词： Patient rehabilitation

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Prediction of Leakage Rates Through Sealing Connections with Metallic Gaskets

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IOP Conference Series: Earth and Environmental Science 2018年第3期199卷

作者： Xiu Feng Boqin Gu Penggao Zhang Fluid Sealing Measurement and Control Engineering Research and Development Center of Jiangsu Province Nanjing Polytechnic Institute Nanjing Jiangsu 210048 China College of Mechanical and Power Engineering Nanjing University of Technology Nanjing Jiangsu 210009 China

According to fractal theory, the leakage model of metallic gaskets was developed in order to predict leakage rate of metallic gasket sealing connections. The relationship among the leakage rate, the fractal dimension, the compressive stress and the scale coefficient obtained by experiment, is approximately the same as that by the sealing model of metallic gaskets, which indicates that the sealing model of metallic gaskets established in this paper is reasonable. The research results not only are helpful for the development and application of metallic gaskets, but also contribute to the establishment of the design criterion and the design method of metallic gasket connections.

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Minimum power scheduling under rician fading in full-duplex relay-assisted D2D communication

Minimum power scheduling under rician fading in full-duplex ...

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2017 IEEE Global Telecommunications Conference, GC 2017

作者： Penda, Demia Della Nomikos, Nikolaos Charalambous, Themistoklis Johansson, Mikael Department of Automatic Control KTH-Royal Institute of Technology Stockholm Sweden Department of Information and Communication Systems Engineering University of the Aegean Samos Greece Department of Electrical Engineering and Automation School of Electrical Engineering Aalto University Espoo Finland

ISBN: (纸本)9781538639207

In cellular systems, the combination of Device-to- Device (D2D) communication and relaying is an efficient means for improving network coverage and transmissions quality without additional infrastructure deployment. It enables communication between user pairs in situations when both their direct D2D transmission and the traditional communication via the base station experience poor channel quality. In this paper, we propose a joint relaying-operation selection and power-allocation scheme, herein called HyD2D, for relay-assisted D2D communication in Rician fading environment. The target is to choose the set of communication links that minimizes the power consumption, while ensuring a minimum success probability. To overcome the nonconvexity of the outage probability constraints under Rician fading, we use the concept of coherent-measure- of-risk from the field of finance. We therefore obtain a linear programming formulation that we can efficiently solve. Simulations show that HyD2D selects the most energy- efficient relaying operation that satisfies the success probability requirement, while leveraging only statistical channel state information. © 2017 IEEE.

关键词： Energy efficiency

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Kernel Self-Adaptive Learning-Based Satellite Telemetry Data Classification 3

Kernel Self-Adaptive Learning-Based Satellite Telemetry Data...

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3rd International Conference on Computing measurement control and Sensor Network, CMCSN 2016

作者： Li, Junbao Yang, Wenhui Liu, Datong Liu, Jing Department of Automatic Test and Control Harbin Institute of Technology China Harbin China College of Information and Communication Engineering Harbin Engineering of Technology China Harbin China

ISBN: (纸本)9781509010936

Telemetry data, containing the data of multiple subsystems such as power system, implies the on-orbit operation status information of the satellite. We can obtain performance characteristics and fault symptom of the satellite subsystems through analyzing these data. Using classification algorithm we can provide normal data for anomaly detection and find the data from various subsystems which have the same category labels. Then we will get potential knowledge of the satellite and rich expert experience. Because of the importance to national defense and people's livelihood fields, we have higher requirements about the accuracy and stability of satellite data processing. We proposed a kernel self-adaptive method based on Fisher Discriminant Analysis (FDA). Firstly map the data to high-dimensional space by kernel function. Then perform PCA in high-dimensional space. Finally classify data by Fisher Discriminant Analysis method. The selection of the kernel function and its parameters realized by self-adaptive method are based on the data. This method can achieve ideal classification accuracy toward satellite telemetry data according to our experiments. And the accuracy is stable when process data of same type. The performance of this method proved that it is reliable. © 2016 IEEE.

关键词： Satellites

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