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COMMUNICATIONS EARTH & ENVIRONMENT 2024年第1期5卷 701页

作者： Capotondi, Antonietta Rodrigues, Regina R. Sen Gupta, Alex Benthuysen, Jessica A. Deser, Clara Froelicher, Thomas L. Lovenduski, Nicole S. Amaya, Dillon J. Le Grix, Natacha Xu, Tongtong Hermes, Juliet Holbrook, Neil J. Martinez-Villalobos, Cristian Masina, Simona Roxy, Mathew Koll Schaeffer, Amandine Schlegel, Robert W. Smith, Kathryn E. Wang, Chunzai University of Colorado Boulder Cooperative Institute for Research in Environmental Sciences Boulder USA (GRID:grid.266190.a) (ISNI:***) NOAA/Physical Sciences Laboratory Boulder USA (GRID:grid.511342.0) Federal University of Santa Catarina Florianópolis Brazil (GRID:grid.411237.2) (ISNI:0000 0001 2188 7235) University of New South Wales Climate Change Research Centre and Centre for Marine Science and Innovation Sydney Australia (GRID:grid.1005.4) (ISNI:0000 0004 4902 0432) University of New South Wales Australian Research Council Centre of Excellence for Climate Extremes Sydney Australia (GRID:grid.1005.4) (ISNI:0000 0004 4902 0432) Australian Institute of Marine Science Crawley Australia (GRID:grid.1046.3) (ISNI:0000 0001 0328 1619) National Center for Atmospheric Research Climate and Global Dynamics Laboratory Boulder USA (GRID:grid.57828.30) (ISNI:0000 0004 0637 9680) University of Bern Climate and Environmental Physics Physics Institute Bern Switzerland (GRID:grid.5734.5) (ISNI:0000 0001 0726 5157) University of Bern Oeschger Centre for Climate Change Research Bern Switzerland (GRID:grid.5734.5) (ISNI:0000 0001 0726 5157) University of Colorado Boulder Department of Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research Boulder USA (GRID:grid.266190.a) (ISNI:***) NOAA/Physical Sciences Laboratory Boulder USA (GRID:grid.511342.0) South African Environmental Observation Network Cape Town South Africa (GRID:grid.507758.8) (ISNI:0000 0004 0499 441X) University of Tasmania Institute for Marine and Antarctic Studies Hobart Australia (GRID:grid.1009.8) (ISNI:0000 0004 1936 826X) University of Tasmania ARC Centre of Excellence for Climate Extremes Hobart Australia (GRID:grid.1009.8) (ISNI:0000 0004 1936 826X) Universidad Adolfo Ibáñez Faculty of Engineering and Science Santiago Chile (GRID:grid.440617.0) (ISNI:0000 0001 2162 5606) ANID Technology Center No. DO210001 Data Observatory Foundation Santiago Chile (GRID:grid.440617.0) CMCC Foundation—Euro-M

Marine heatwaves have profoundly impacted marine ecosystems over large areas of the world oceans, calling for improved understanding of their dynamics and predictability. Here, we critically review the recent substantial advances in this active area of research, including the exploration of the three-dimensional structure and evolution of these extremes, their drivers, their connection with other extremes in the ocean and over land, future projections, and assessment of their predictability and current prediction skill. To make progress on predicting and projecting marine heatwaves and their impacts, a more complete mechanistic understanding of these extremes over the full ocean depth and at the relevant spatial and temporal scales is needed, together with models that can realistically capture the leading mechanisms at those scales. Sustained observing systems, as well as measuring platforms that can be rapidly deployed, are essential to achieve comprehensive event characterizations while also chronicling the evolving nature of these extremes and their impacts in our changing *** understanding of marine heatwave predictability and impacts requires analysis of these extremes at full ocean depth, using models and observations capturing their key drivers at the relevant scales, according to a broad literature review.

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Academic access data analysis for literature recommendation 23rd

Academic access data analysis for literature recommendation

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23rd China conference on Information Retrieval, CCIR 2017

作者： Fan, Yixing Guo, Jiafeng Lan, Yanyan Xu, Jun Cheng, Xueqi CAS Key Lab of Network Data Science and Technology Institute of Computing Technology Chinese Academy of Sciences Beijing100190 China

ISBN: (纸本)9783319686981

Academic reading plays an important role in researchers’ daily life. To alleviate the burden of seeking relevant literature from rapidly growing academic repository, different kinds of recommender systems have been introduced in recent years. However, most existing work focused on adopting traditional recommendation techniques, like content-based filtering or collaborative filtering, in the literature recommendation scenario. Little work has yet been done on analyzing the academic reading behaviors to understand the reading patterns and information needs of real-world academic users, which would be a foundation for improving existing recommender systems or designing new ones. In this paper, we aim to tackle this problem by carrying out empirical analysis over large scale academic access data, which can be viewed as a proxy of academic reading behaviors. We conduct global, group-based and sequence-based analysis to address the following questions: (1) Are there any regularities in users’ academic reading behaviors? (2) Will users with different levels of activeness exhibit different information needs? (3) How to correlate one’s future demands with his/her historical behaviors? By answering these questions, we not only unveil useful patterns and strategies for literature recommendation, but also identify some challenging problems for future development. © Springer International Publishing AG 2017.

关键词： Recommender systems

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Experimental twin-field quantum key distribution through sending-or-not-sending

arXiv

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arXiv 2019年

作者： Liu, Yang Yu, Zong-Wen Zhang, Weijun Guan, Jian-Yu Chen, Jiu-Peng Zhang, Chi Hu, Xiao-Long Li, Hao Jiang, Cong Lin, Jin Chen, Teng-Yun You, Lixing Wang, Zhen Wang, Xiang-Bin Zhang, Qiang Pan, Jian-Wei Shanghai Branch National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science and Technology of China Shanghai201315 Taiwan Shanghai Branch CAS Center for Excellence Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai201315 Taiwan Jinan Institute of Quantum Technology JinanShandong250101 Taiwan State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 Taiwan Data Communication Science and Technology Research Institute Beijing100191 Taiwan State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 Taiwan

Channel loss seems to be the most severe limitation on the practical application of long distance quantum key distribution. The idea of twin-field quantum key distribution can improve the key rate from the linear scale of channel loss in the traditional decoy-state method to the square root scale of the channel transmittance. However, the technical demanding is rather tough because it requests single photon level interference of two remote independent lasers. Here, we adopt the technology developed in the frequency and time transfer to lock two independent lasers’ wavelengths and utilize additional phase reference light to estimate and compensate the fiber fluctuation. Further with a single photon detector with high detection rate, we demonstrate twin field quantum key distribution through the sending-or-not-sending protocol with realistic phase drift over 300 km optical fiber spools. We calculate the secure key rates with finite size effect. The secure key rate at 300 km (1.96 × 10−6) is higher than that of the repeaterless secret key capacity (8.64 × 10−7). Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum cryptography

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Nonlinear Prediction with Deep Recurrent Neural networks for Non-Blind Audio Bandwidth Extension

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China Communications 2018年第4期15卷 72-85页

作者： Lin Jiang Ruimin Hu Xiaochen Wang Weiping Tu Maosheng Zhang National Engineering Research Center for Multimedia Software School of Computer Science Wuhan University Wuhan 430072 China Institute of Big Data and internet Innovation Hunan University of Commerce Changsha 410205 China Software College East China University of Technology Nanchang 330013 China Collaborative Innovation Center for Economics crime investigation and prevention technology Jiangxi Province Nanchang 330103China Hubei Key Laboratory of Multimedia and Network Communication Engineering Wuhan University Wuhan 430072 China Collaborative Innovation Center of Geospatial Technology Wuhan 430079 China

Non-blind audio bandwidth extension is a standard technique within contemporary audio codecs to efficiently code audio signals at low bitrates. In existing methods, in most cases high frequencies signal is usually generated by a duplication of the corresponding low frequencies and some parameters of high frequencies. However, the perception quality of coding will significantly degrade if the correlation between high frequencies and low frequencies becomes weak. In this paper, we quantitatively analyse the correlation via computing mutual information value. The analysis results show the correlation also exists in low frequency signal of the context dependent frames besides the current frame. In order to improve the perception quality of coding, we propose a novel method of high frequency coarse spectrum generation to improve the conventional replication method. In the proposed method, the coarse high frequency spectrums are generated by a nonlinear mapping model using deep recurrent neural network. The experiments confirm that the proposed method shows better performance than the reference methods.

关键词： audio coding non-blind audiobandwidth extension context correlation deeprecurrent neural network

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Author Correction: A bimodal burst energy distribution of a repeating fast radio burst source

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Nature 2022年第7891期601卷 E1页

作者： D Li P Wang W W Zhu B Zhang X X Zhang R Duan Y K Zhang Y Feng N Y Tang S Chatterjee J M Cordes M Cruces S Dai V Gajjar G Hobbs C Jin M Kramer D R Lorimer C C Miao C H Niu J R Niu Z C Pan L Qian L Spitler D Werthimer G Q Zhang F Y Wang X Y Xie Y L Yue L Zhang Q J Zhi Y Zhu CAS Key Laboratory of FAST NAOC Chinese Academy of Sciences Beijing China. dili@***. University of Chinese Academy of Sciences Beijing China. dili@***. CAS Key Laboratory of FAST NAOC Chinese Academy of Sciences Beijing China. Department of Physics and Astronomy University of Nevada Las Vegas Las Vegas NV USA. zhang@physics.unlv.edu. University of Chinese Academy of Sciences Beijing China. CSIRO Astronomy and Space Science Epping New South Wales Australia. Department of Physics Anhui Normal University Wuhu China. Cornell Center for Astrophysics and Planetary Science and Department of Astronomy Cornell University Ithaca NY USA. Max-Planck-Institut für Radioastronomie Bonn Germany. Western Sydney University Penrith New South Wales Australia. Department of Astronomy University of California Berkeley Berkeley CA USA. Department of Physics and Astronomy West Virginia University Morgantown WV USA. Center for Gravitational Waves and Cosmology West Virginia University Morgantown WV USA. School of Astronomy and Space Science Nanjing University Nanjing China. Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education Nanjing China. Guizhou Normal University Guiyang China. School of Physics and Technology Wuhan University Wuhan China. Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal University Guiyang China.

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Recovery and repair schemes for shift-XOR regenerating codes

arXiv

引用

arXiv 2019年

作者： Fu, Ximing Yang, Shenghao Xiao, Zhiqing School of Science and Engineering Chinese University of Hong Kong Shenzhen China University of Science and Technology of China China School of Science and Engineering Chinese University of Hong Kong Shenzhen Guangdong518172 China Shenzhen Key Laboratory of IoT Intelligent Systems and Wireless Network Technology Chinese University of Hong Kong Shenzhen Guangdong518172 China Shenzhen Research Institute of Big Data Shenzhen Guangdong518172 China Tsinghua University

Recovery and repair schemes are proposed for shift-exclusive-or (shift-XOR) product-matrix (PM) regenerating codes, which outperform those of the existing PM codes in terms of both communication and computation costs. In particular, for the minimum bandwidth regenerating (MBR) codes, our recovery and repair schemes have the optimal transmission bandwidth, zero decoding auxiliary data space and lower time complexity;for the minimum storage regenerating (MSR) codes, our recovery and repair schemes have smaller transmission bandwidth, smaller decoding auxiliary data space and lower time complexity. Moreover, our schemes involve only XOR operations in recovery and repair and are practical for system implementation. Technically, a procedure is first proposed for solving a system of shift-XOR equations, which plays a similar fundamental role as Gaussian elimination for solving systems of linear equations, and is of independent interest. The recovery and repair of shift-XOR MBR/MSR codes are then decomposed into a sequence of systems of shift-XOR equations, and hence can be solved by a sequence of calls to the procedure for solving a system of shift-XOR equations. As the decomposition of the recovery and repair depends only on the PM construction, but not the specific shift and XOR operations, our recovery and repair schemes can be extended to other MBR/MSR codes using the PM construction. Copyright © 2019, The Authors. All rights reserved.

关键词： Matrix algebra

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Experimental 4-intensity decoy-state quantum key distribution with asymmetric basis detector efficiency

arXiv

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arXiv 2019年

作者： Liu, Hui Yu, Zong-Wen Zou, Mi Tang, Yan-Lin Zhao, Yong Zhang, Jun Wang, Xiang-Bin Chen, Teng-Yun Pan, Jian-Wei Hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science and Technology of China Hefei Anhui230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Data Communication Science and Technology Research Institute Beijing100191 China Jinan Institute of Quantum Technology SAICT Jinan250101 China Department of Physics Southern University of Science and Technology Shenzhen518055 China QuantumCTek Corporation Limited Hefei Anhui230088 China

The decoy-state method has been developed rapidly in quantum key distribution (QKD) since it is immune to photon-number splitting attacks. However, two basis detector efficiency asymmetry, which exists in realistic scenarios, has been ignored in the prior results. By using the recent 4-intensity decoy-state optimization protocol, we report the first implementation of high-rate QKD with asymmetric basis detector efficiency, demonstrating 1.9 to 33.2 times higher key rate than previous protocols in the situation of large basis detector efficiency asymmetry. The results ruled out an implicitly assumption in QKD that the efficiency of Z basis and X basis are restricted to be same. This work pave the way towards a more practical QKD setting. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum cryptography

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ICTNET at TREC 2017 Dynamic Domain Track 26

ICTNET at TREC 2017 Dynamic Domain Track

引用

26th Text REtrieval Conference, TREC 2017

作者： Zhang, Weimin Hu, Yaokang Jia, Rongqian Wang, Xianfa Zhang, Le Feng, Yue Yu, Sihao Xue, Yuanhai Yu, Xiaoming Liu, Yue Cheng, Xueqi Institute of Computing Technology CAS China Key Laboratory of Web Data Science and Technology CAS China University of Chinese Academy of Sciences China

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Ab Initio Calculation on Spectroscopic Properties and Radiative Lifetimes of Low-Lying Excited States of NaK

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Chinese Journal of Chemical Physics 2019年第6期32卷 667-673,I0002页

作者： Shi-yang Zhang Feng Xie Feng-dong Jia Xiao-kang Li Ru-quan Wang Rui Li Yong Wu Zhi-ping Zhong School of Physics University of Chinese Academy of SciencesBeijing 100049China Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China Institute of Physics Chinese Academy of SciencesBeijing 100190China Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Department of Physics College of ScienceQiqihar UniversityQiqihar 161006China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We performed high-level ab initio calculations on electronic structure of Na K. The potential energy curves (PECs) of 10 Λ-S states correlated with the three lowest dissociation limits have been calculated. On the basis of the calculated PECs, the spectroscopic constants of the boundΛ-S states are obtained, which are in good agreement with experimental results. The maximum vibrational quantum numbers of the singlet ground state X^1Σ^+ and the triplet ground state a^3Σ^+ have been analyzed with the semiclassical scattering theory. Transition properties including transition dipole moments, Franck-Condon factors, and radiative lifetimes have been investigated. The research results indicate that such calculations can provide fairly reliable estimation of parameters for the ultracold alkali diatomic molecular experiment.

关键词： Ultracold dipolar molecule Transition dipole moment Spectroscopic constants Potential curves

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Development of a novel method for rapid cloning of shRNA vectors, which successfully knocked down CD44 in mesenchymal triple-negative breast cancer cells

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Cancer Communications 2018年第1期38卷 617-621页

作者： Lei Zhou Dandan Sheng Qiaodan Deng Dong Wang Suling Liu The CAS Key Laboratory of Innate Immunity and Chronic Disease School of Life Sciences and Medical CenterUniversity of Science&Technology of ChinaHefei 230027AnhuiP.R.China Fudan University Shanghai Cancer Center&Institutes of Biomedical Sciences Shanghai Medical CollegeKey Laboratory of Breast Cancer in ShanghaiInnovation Center for Cell Signaling NetworkCancer InstitutesDepartment of Breast SurgeryFudan UniversityShanghai 200032P.R.China

Dear Editor,Since the discovery of short hairpin RNA(shRNA)vec-tor-mediated RNA interference(RNAi),this technology has been widely used in cancer research for its specific-ity,potency,and ***,researchers may find it costly to purchase commercial vectors from bio-companies or time-and labor-consuming to construct their own shRNA vectors using traditional method by inserting annealed duplex into digested *** intensive efforts to accelerate shRNA vector cloning in laboratories,the development of a reliable,rapid,conven-ient,and cost-effective method is still in great *** this end,we developed a novel method named SuperSH(Super rapid cloning of shRNA vector)for the effective and rapid construction of shRNA-expressing vectors based on high-performance DNA polymerase and seamless cloning technique[1](Additional file 1:Fig-ure S1a;the detailed methods can be found in Additional file 1).In our SuperSH method,the shRNA sequences are introduced into the vector via a pair of polymerase chain reaction(PCR)primers rather than via annealed *** detail,the 3′ends of the primers are designed to bind the template to initiate a PCR to amplify the vector back-bone,and the 5′portions are designed to introduce the sequences of interest as well as to form a short homol-ogous arm for subsequent recombination via seamless cloning[1].

关键词： rapid duplex companies

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