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arXiv 2018年

作者： Chu, Jielei Wang, Hongjun Liu, Jing Gong, Zhiguo Li, Tianrui Institute of Artificial Intelligence School of Information Science and Technology Southwest Jiaotong University Chengdu611756 China National Engineering Laboratory of Integrated Transportation Big Data Application Technology Southwest Jiaotong University Chengdu611756 China School of Business Sichuan University ChengduSichuan610065 China State Key Laboratory of Internet of Things for Smart City Department of Computer and Information Science University of Macau China

In this paper, we present a novel unsupervised feature learning architecture, which consists of a multi-clustering integration module and a variant of RBM termed multi-clustering integration RBM (MIRBM). In the multi-clustering integration module, we apply three unsupervised K-means, affinity propagation and spectral clustering algorithms to obtain three different clustering partitions (CPs) without any background knowledge or label. Then, an unanimous voting strategy is used to generate a local clustering partition (LCP). The novel MIRBM model is a core feature encoding part of the proposed unsupervised feature learning architecture. The novelty of it is that the LCP as an unsupervised guidance is integrated into one step contrastive divergence (CD1) learning to guide the distribution of the hidden layer features. For the instance in the same LCP cluster, the hidden and reconstructed hidden layer features of the MIRBM model in the proposed architecture tend to constrict together in the training process. Meanwhile, each LCP center tends to disperse from each other as much as possible in the hidden and reconstructed hidden layer during training. The experiments demonstrate that the proposed unsupervised feature learning architecture has more powerful feature representation and generalization capability than the state-of-the-art graph regularized RBM (GraphRBM) for clustering tasks in the Microsoft Research Asia Multimedia (MSRA-MM)2.0 dataset. Copyright © 2018, The Authors. All rights reserved.

关键词： Integration

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Satellite-Relayed Intercontinental Quantum Network

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Physical Review Letters 2018年第3期120卷 030501-030501页

作者： Sheng-Kai Liao Wen-Qi Cai Johannes Handsteiner Bo Liu Juan Yin Liang Zhang Dominik Rauch Matthias Fink Ji-Gang Ren Wei-Yue Liu Yang Li Qi Shen Yuan Cao Feng-Zhi Li Jian-Feng Wang Yong-Mei Huang Lei Deng Tao Xi Lu Ma Tai Hu Li Li Nai-Le Liu Franz Koidl Peiyuan Wang Yu-Ao Chen Xiang-Bin Wang Michael Steindorfer Georg Kirchner Chao-Yang Lu Rong Shu Rupert Ursin Thomas Scheidl Cheng-Zhi Peng Jian-Yu Wang Anton Zeilinger Jian-Wei Pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 China Chinese Academy of Sciences (CAS) Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315 China Vienna Center for Quantum Science and Technology Faculty of Physics University of Vienna Vienna 1090 Austria Institute for Quantum Optics and Quantum Information Austrian Academy of Sciences Vienna 1090 Austria School of Computer National University of Defense Technology Changsha 410073 China Key Laboratory of Space Active Opto-Electronic Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Key Laboratory of Optical Engineering Institute of Optics and Electronics Chinese Academy of Sciences Chengdu 610209 China Shanghai Engineering Center for Microsatellites Shanghai 201203 China State Key Laboratory of Astronautic Dynamics Xi’an Satellite Control Center Xi’an 710061 China Xinjiang Astronomical Observatory Chinese Academy of Sciences Urumqi 830011 China National Space Science Center Chinese Academy of Sciences Beijing 100080 China Space Research Institute Austrian Academy of Sciences Graz 8042 Austria

We perform decoy-state quantum key distribution between a low-Earth-orbit satellite and multiple ground stations located in Xinglong, Nanshan, and Graz, which establish satellite-to-ground secure keys with ∼kHz rate per passage of the satellite Micius over a ground station. The satellite thus establishes a secure key between itself and, say, Xinglong, and another key between itself and, say, Graz. Then, upon request from the ground command, Micius acts as a trusted relay. It performs bitwise exclusive or operations between the two keys and relays the result to one of the ground stations. That way, a secret key is created between China and Europe at locations separated by 7600 km on Earth. These keys are then used for intercontinental quantum-secured communication. This was, on the one hand, the transmission of images in a one-time pad configuration from China to Austria as well as from Austria to China. Also, a video conference was performed between the Austrian Academy of sciences and the Chinese Academy of sciences, which also included a 280 km optical ground connection between Xinglong and Beijing. Our work clearly confirms the Micius satellite as a robust platform for quantum key distribution with different ground stations on Earth, and points towards an efficient solution for an ultralong-distance global quantum network.

关键词： Quantum channels Quantum communication Quantum cryptography Quantum networks Quantum optics

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Corrigendum to ‘Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS’ [Remote Sensing of Environment 247 (2020)]

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Remote Sensing of Environment 2020年 248卷

作者： Shenglei Wang Junsheng Li Bing Zhang Zhongping Lee Evangelos Spyrakos Lian Feng Chong Liu Hongli Zhao Yanhong Wu Liping Zhu Liming Jia Wei Wan Fangfang Zhang Qian Shen Andrew N. Tyler Xianfeng Zhang School of Earth and Space Sciences Peking University Beijing China Key Laboratory of Digital Earth Science Aerospace Information Research Institute Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China School for the Environment University of Massachusetts Boston Boston MA USA Biological and Environmental Sciences Faculty of Natural Sciences University of Stirling Stirling UK State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China China Institute of Water Resources and Hydropower Research Beijing China Environmental Monitoring Central Station of Heilongjiang Province Harbin China

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Hybrid and integrated schottky diode based 330GHz and 420GHz subharmonic mixers

Hybrid and integrated schottky diode based 330GHz and 420GHz...

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2017 International Applied Computational Electromagnetics Society Symposium in China, ACES-China 2017

作者： Zhang, Bo Liu, Ge Zhang, Lisen Xing, Dong Wang, Junlong Fan, Yong School of Electronic Engineering Universtity of Electronic Science and Technology of China Chengdu Sichuan611731 China National Key Laboratory of Application Specific Integrated Circuits Hebei Semiconductor Research Institute Shijiazhuang050000 China

ISBN: (纸本)9780996007856

This paper describes the planar schottky diode based subharmonic mixers currently being developed at the EHF key laboratory of Fundamental science of Universtity of Electronic science and technology of China. Hybrid and integrated GaAs Schottky diode based 330GHz and 420GHz subharmonic mixers are designed, fabricated and measured. Test results show that the minimum conversion loss of 330GHz monolithic integrated sub-harmonic mixer is 10.4dB at 328GHz, SSB conversion loss is less than 14.7dB from 320GHz to 340GHz when the LO power is 5mW;the minimum conversion loss of the 420GHz hybrid sub-harmonic mixer is 9.99dB at 406GHz, the SSB conversion loss is less than 15dB from 380GHz to 430GHz when the local power is 6dBm;the minimum conversion loss of the 420GHz heterogeneous integrated sub-harmonic mixer is 10dB at 419GHz and 422GHz, SSB conversion loss is less than 14.7dB over 400GHz to 440GHz frequency range when the LO power is 5.2dBm at 210GHz. © 2017 Applied Computational Electromagnetics Society.

关键词： Gallium arsenide

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Two practical random-subcarrier-selection methods for secure precise wireless transmission

arXiv

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arXiv 2018年

作者： Shen, Tong Zhang, Shuo Chen, Riqing Wang, Jin Hu, Jinsong Shu, Feng Wang, Jiangzhou School of Electronic and Optical Engineering Nanjing University of Science and Technology 210094 China School of Computer and information Fujian Agriculture and Forestry University Fuzhou350002 China National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing Aerospace Automatic Control Institute Beijing100854 China School of Engineering and Digital Arts University of Kent CanterburyCT2 7NT United Kingdom

In directional modulation (DM) networks, two practical random-subcarrier-selection (RSS) methods are proposed to transmit confidential message to the desired user per orthogonal frequency division multiplexing (OFDM) symbol with only single receive power peak formed by constructing random subcarrier set and performing a randomization procedure. This scheme completely addresses the crucial problem facing secure precise wireless transmission (SPWT), how to achieve the SPWT per OFDM symbol while the traditional SPWT holds only in the statistically average sense. Several necessary conditions for SPWT per OFDM is derived and proposed: random, distributed, and distinct subcarrier spacing pattern mapped onto transmit antenna array. Two random subcarrier index sets, quadratic subcarrier set (QSS) and prime subcarrier set (PSS), are constructed. Subsequently, a random metric is defined, and a randomization procedure (RP) is proposed. Its detailed process includes the following steps: integer mod, ordering, blocking, and block interleaving (BI) where BI is repeated until the random metric is greater than the predefined value. This yields a single high energy main peak (SHEMP) at the desired position with other positions, outside the main peak, harvesting only weak receive energy seriously corrupted by AN. Simulation results confirm that our proposed two methods, QSS plus RP and PSS plus RP, perform significantly better than conventional methods such as linear subcarrier set (LSS) plus RP. They actually form a SHEMP at desired position, and generate only extremely small leakage outside the main peak. Copyright © 2018, The Authors. All rights reserved.

关键词： Orthogonal frequency division multiplexing

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Noise-synchronizability of opinion dynamics

arXiv

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arXiv 2018年

作者： Su, Wei Chen, Ge Yu, Yongguang Wang, Xueqiao School of Automation and Electrical Engineering University of Science and Technology Beijing & Key Laboratory of Knowledge Automation for Industrial Processes Ministry of Education Beijing100083 China National Center for Mathematics and Interdisciplinary Sciences & Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China School of Science Beijing Jiaotong University Beijing100044 China Beijing key laboratory of information service engineering Beijing Union University Beijing100101 China

With the analysis of noise-induced synchronization of opinion dynamics with bounded confidence (BC), a natural and fundamental question is what opinion structures can be synchronized by noise. In the traditional Hegselmann-Krause (HK) model, each agent examines the opinion values of all the other ones and then choose neighbors to update its own opinion according to the BC scheme. In reality, people are more likely to interchange opinions with only some individuals, resulting in a predetermined local discourse relationship as introduced by the DeGroot model. In this paper, we consider an opinion dynamics that combines the schemes of BC and local discourse topology and investigate its synchronization induced by noise. The new model endows the heterogeneous HK model with a time-varying discourse topology. With the proposed definition of noise-synchronizability, it is shown that the compound noisy model is almost surely noise-synchronizable if and only if the time-varying discourse graph is uniformly jointly connected, taking the noise-induced synchronization of the classical heterogeneous HK model as a special case. As a natural implication, the result for the first time builds the equivalence between the connectivity of discourse graph and the beneficial effect of noise for opinion consensus. Copyright © 2018, The Authors. All rights reserved.

关键词： Topology

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Constraints on Cosmic Strings Using Data from the Third Advanced LIGO–Virgo Observing Run

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Physical Review Letters 2021年第24期126卷 241102-241102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. Auclair 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 S. Barnum 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 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 L. Cadonati M. Caesar G. Cagnoli C. Cahillane H. W. Cain, III J. Calderón Bustillo J. D 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 search for gravitational-wave signals produced by cosmic strings in the Advanced LIGO and Virgo full O3 dataset. Search results are presented for gravitational waves produced by cosmic string loop features such as cusps, kinks, and, for the first time, kink-kink collisions. A template-based search for short-duration transient signals does not yield a detection. We also use the stochastic gravitational-wave background energy density upper limits derived from the O3 data to constrain the cosmic string tension Gμ as a function of the number of kinks, or the number of cusps, for two cosmic string loop distribution models. Additionally, we develop and test a third model that interpolates between these two models. Our results improve upon the previous LIGO–Virgo constraints on Gμ by 1 to 2 orders of magnitude depending on the model that is tested. In particular, for the one-loop distribution model, we set the most competitive constraints to date: Gμ≲4×10−15. In the case of cosmic strings formed at the end of inflation in the context of grand unified theories, these results challenge simple inflationary models.

关键词： Cosmic strings & domain walls Gravitational waves

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Mycolyltransferase is important for biofilm formation and pathogenesis of Tsukamurella keratitis

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Emerging microbes & infections 2024年第1期13卷 2373317页

作者： Jade Lee-Lee Teng Ying Tang Samson Sai-Yin Wong Man Lung Yeung Jian-Pao Cai Chen Chen Elaine Chan Jordan Yik-Hei Fong Rex Kwok-Him Au-Yeung Lifeng Xiong Terrence Chi-Kong Lau Susanna Kar-Pui Lau Patrick Chiu-Yat Woo Faculty of Dentistry The University of Hong Kong Hong Kong Special Administrative Region Hong Kong People's Republic of China. Department of Microbiology School of Clinical Medicine Li Ka Shing Faculty of Medicine The University of Hong Kong Hong Kong Special Administrative Region Hong Kong People's Republic of China. State Key Laboratory of Emerging Infectious Diseases Li Ka Shing Faculty of Medicine The University of Hong Kong Hong Kong Special Administrative Region Hong Kong People's Republic of China. Department of Clinical Microbiology and Infection Control The University of Hong Kong-Shenzhen Hospital Shenzhen People's Republic of China. Carol Yu Centre for Infection Li Ka Shing Faculty of Medicine The University of Hong Kong Hong Kong Special Administrative Region Hong Kong People's Republic of China. Centre for Virology Vaccinology and Therapeutics Hong Kong Science and Technology Park Hong Kong Special Administrative Region Hong Kong People's Republic of China. Beijing Ditan Hospital Capital Medical University Beijing Key Laboratory of Emerging infectious Diseases Beijing People's Republic of China. Department of Pathology The University of Hong Kong Hong Kong Special Administrative Region Hong Kong People's Republic of China. Department of Biomedical Sciences Jockey Club College of Veterinary Medicine and Life Sciences City University of Hong Kong Hong Kong Special Administrative Region Hong Kong People's Republic of China. Doctoral Program in Translational Medicine and Department of Life Sciences National Chung Hsing University Taichung Taiwan. The iEGG and Animal Biotechnology Research Center National Chung Hsing University Taichung Taiwan.

, a group of multi-drug resistant, Gram-positive, aerobic, and partially acid-fast bacteria, are emerging causes of bacterial conjunctivitis and keratitis. However, the pathogenesis of keratitis is largely unknown. To address this, we used New Zealand White rabbits to develop the first eye infection model and conducted tests to study the pathogenesis mechanisms of . There is increasing evidence that biofilms play a significant role in ocular infections, leading us to hypothesize that biofilm formation is crucial for effective infection. In order to look for potential candidate genes which are important in biofilm formation and keratitis. We performed genome sequencing of two ocular isolates, -PW1004 and -PW899, to identify potential virulence factors. Through and studies, we characterized their biological roles in mediating keratitis. Our findings confirmed that is an ocular pathogen by fulfilling Koch's postulates, and using genome sequence data, we identified encoding a mycolyltransferase, as a crucial gene in biofilm formation and causing keratitis in the rabbit model. This is the first report demonstrating the novel role of mycolyltransferase in causing ocular infections. Overall, our findings contribute to a better understanding of pathogenesis and provide a potential target for treatment. Specific inhibitors targeting TmytC could serve as an effective treatment option for infections.

关键词： Koch's postulates Tsukamurella conjunctivitis keratitis mycolyltransferase virulence

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Effects of Content of Chopped Glass Fibers on the Properties of Silica Filled PTFE Composites

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Journal of Materials science and Chemical Engineering 2017年第7期5卷 36-44页

作者： Ying Yuan Haodong Lin Zehua Jiang Zhifeng Chi Minghao Yao Shuren Zhang National Engineering Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of China Chengdu China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China

In this work, the polytetrafluoroethylene (PTFE)-based composite substrates were manufactured by mixing, calendering, hot-pressing sintering. The composition of all the samples was PTFE, SiO2 and chopped E-glass fibers. The effects of content of E-glass fibers on the properties of the SiO2 filled PTFE composites were investigated, including density, water absorption, dielectric properties (εr, tanδ), coefficient of thermal expansion (CTE) and temperature coefficient of dielectric constant (τε). The compositions of inorganic materials mixture are (62 ? x) % SiO2 + x % E-glass fiber (x: mass ratio to composites, x = 0, 1, 1.5, 2, 2.5, 3). The results show that as the content of E-glass fibers is 2.5 wt.%, this composite obtains optimal properties, including excellent dielectric properties (εr^2.9123, tanδ~0.0011), acceptable water absorption of 0.075%, temperature coefficient of dielectric constant of 10 ppm/?C and coefficient of thermal expansion of 15.87 ppm/?C.

关键词： Polymers Composite Materials PTFE Dielectric Properties E-Glass Fiber

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Trypanosoma brucei rhodesiense infection in a Chinese traveler returning from the Serengeti national Park in Tanzania

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Infectious Diseases of Poverty 2018年第1期7卷 486-491页

作者： Qin Liu Xiao-Ling Chen Mu-Xin Chen Han-Guo Xie Qing Liu Zhu-Yun Chen Yao-Ying Lin Hua Zheng Jia-Xu Chen Yi Zhang Xiao-Nong Zhou National Institute of Parasitic Diseases Chinese Center for Disease Control and PreventionChinese Center for Tropical Diseases ResearchWHO Collaborating Centre for Tropical DiseasesNational Center for International Research on Tropical DiseasesMinistry of Science and TechnologyKey Laboratory of Parasite and Vector BiologyMinistry of HealthShanghai 200025China Fujian Medical University Union Hospital FuzhouFujian 350001People’s Republic of China Fujian Provincial Center for Diseases Control and Prevention FuzhouFujian 350000People’s Republic of China

Background:Human African trypanosomiasis(HAT)is one of the most complex parasitic diseases known to *** usually occurs in endemic areas in Africa,but is occasionally detected in returning travelers and migrants in non-endemic *** presentation:In August 2017,a case of HAT was diagnosed in China in a traveler returning from the Masai Mara area in Kenya and the Serengeti area in *** traveler visited Africa from 23 July to 5 August,*** return to China,she developed a fever(on 8 August),and Trypanosoma brucei rhodesiense infection was confirmed by laboratory tests(on 14 August)including observation of parasites in blood films and by polymerase chain *** was treated with pentamidine followed by suramin,and recovered 1 month ***:This is the first imported rhodesiense HAT case reported in *** case alerts clinical and public health workers to be aware of HAT in travelers,and expatriates and migrants who have visited at-risk areas in Africa.

关键词： Trypanosoma brucei rhodesiense Human African trypanosomiasis Imported infection China Treatment Suramin Tanzania

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