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Spatial-Temporal Resource Utilization for Partially Connected Multi-AUV Broadcast Scheduling

IEEE Wireless Communications Letters 2025年第5期14卷 1321-1325页

作者： He, Hongyi Du, Jun Jiang, Chunxiao Wang, Jintao Song, Jian Niyato, Dusit Tsinghua University Beijing National Research Center for Information Science and Technology and State Key laboratory of Space Network and Communications Department of Electronic Engineering Beijing100084 China Tsinghua University Department of Electronic Engineering and State Key laboratory of Space Network and Communications Beijing100084 China Tsinghua University Beijing National Research Center for Information Science and Technology Beijing100084 China Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Beijing100084 China Tsinghua University Shenzhen International Graduate School Shenzhen518055 China Nanyang Technological University College of Computing and Data Science Singapore

The long propagation delays in underwater acoustic channels can be leveraged to improve communication efficiency using spatial-temporal reuse techniques. This work focuses on a system of partially connected AUVs that continuously broadcast packets. A central controller gathers the location information of the AUVs and designs a broadcast sequence exploiting propagation delays to minimize the broadcast cycle. Since finding optimal solutions is time-consuming, we propose a scheduling algorithm that uses heuristics based on partial connections to reduce computational complexity. Additionally, we allow collision tolerance to shorten the broadcast cycle further and investigate the trade-off of the shorter broadcast cycle and collision probability, resulting in a scheduling algorithm exhibiting receiving-alignment properties. Simulations demonstrate the effectiveness of the proposed algorithm in reducing broadcast cycles while maintaining low computational complexity. © 2012 IEEE.

关键词： Scheduling algorithms

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Pronounced advance on typhoon track forecast with global convection-permitting model

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science Bulletin 2025年第9期70卷 1424-1428页

作者： Gu, Jun Zhao, Chun Li, Gudongze Feng, Jiawang Xu, Mingyue Du, Qiuyan Xia, Zihan Li, Yubin Chen, Guanghua Hao, Xiaoyu Chen, Junshi An, Hong Deep Space Exploration Laboratory / School of Earth and Space Sciences / CMA-USTC Laboratory of Fengyun Remote Sensing / State Key Laboratory of Fire Science / Institute of Advanced Interdisciplinary Research on High-Performance Computing Systems and Software University of Science and Technology of China Hefei230026 China Laoshan Laboratory Qingdao266237 China CAS Center for Excellence in Comparative Planetology University of Science and Technology of China Hefei230026 China School of Atmospheric Physics Nanjing University of Information Science and Technology Nanjing210044 China Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Beijing100029 China School of Computer Science and Technology University of Science and Technology of China Hefei230026 China

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Improvement of Interference Fringes Analysis to Obtain Accurate Soret Coefficients

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Defect and Diffusion Forum 2025年 439卷 291-304页

作者： Horikoshi, Haruki Orikasa, Isamu Kataoka, Minami Inatomi, Yuko Suzuki, Shinsuke Department of Applied Mechanics and Aerospace Engineering Waseda University Tokyo169-8555 Japan Department of Materials Science Waseda University Tokyo169-8555 Japan Kagami Memorial Research Institute of Materials Science and Technology Waseda University Tokyo169-8555 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Kanagawa252-5210 Japan Space and Astronautical Science The Graduate University for Advanced Studies SOKENDAI Kanagawa252-5210 Japan

In this study, we proposed a moved-view analysis, a method for obtaining the Soret coefficient ST by analyzing the interference fringe change during field-of-view movement in the steady state. This analysis was designed to solve the problem that the sign of the concentration gradient could also be reversed if the plot of the concentration distribution was only slightly shifted owing to the narrow field of view. The data obtained from the experiment conducted to measure ST at the International space Station were analyzed using moved-view analysis. For the moved-view analysis, the linearity of the concentration distribution induced by the Soret effect is larger than that for the method without field-of-view movement, and a more reliable ST can be obtained. The analysis error that sometimes occurred when the laser wavelength switched led to the underestimation of the phase change Δ, resulting in generating the data with low linearity. This unreliable data should be removed. © 2025 Trans Tech Publications Ltd, All Rights Reserved.

关键词： Interferometers

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Enhanced dual electro-optic comb spectroscopy for rapid metastable helium detection

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Optics Express 2025年第9期33卷 18938-18950页

作者： Yin, Qin Zhao, Ruocan Wang, Chong Chen, Tingdi Liang, Chen Xue, Xianghui CAS Key Laboratory of Geospace Environment School of Earth and Space Sciences University of Science and Technology of China Hefei230026 China Hefei National Laboratory Hefei230088 China CAS Center for Excellence in Comparative Planetology Anhui Mengcheng Geophysics National Observation and Research Station University of Science and Technology of China Hefei China Hefei National Research Center for Physical Sciences at the Microscale School of Physical Sciences University of Science and Technology of China Hefei China

Dual-comb spectroscopy is a powerful tool for precision metrology, offering advantages such as wide spectral range and high-speed spectroscopic acquisition. In this work, we extend dual electro-optic comb (EO-comb) technology to the field of plasma diagnostics, allowing for the observation of various atomic absorption lines, which broadens its applicability across different plasma species. By setting large repetition rates difference between two EO combs, we achieve a sub-microsecond density and temperature measurement rate of metastable helium. With this high measurement rate, we observed the discharge, rise, steady-state, and quenching phases of plasma. Experimental results align closely with theoretical predictions, validating the method’s accuracy. Noise analysis indicates that further improvements in density resolution can be attained through hardware optimizations. The improved signal-to-noise ratio (SNR) enables simultaneous, high-precision measurements of plasma density, temperature, and velocity, which is crucial for analyzing rapid plasma processes. More atomic transitions could be accessed by incorporating nonlinear fibers, which facilitates a comprehensive understanding of the plasma initiation and evolution processes. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Temperature measurement

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Spatio-Temporal Heterogeneous Graph Neural Network With Multi-view Learning For Traffic Prediction 27th

Spatio-Temporal Heterogeneous Graph Neural Network With Mult...

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27th International Conference on Pattern Recognition, ICPR 2024

作者： Song, Liting Ren, Qianqian Zhou, Ying Department of Computer Science and Technology Heilongjiang University Harbin150080 China Heilongjiang Network Space Research Center Harbin150090 China

ISBN: (纸本)9783031781827

Among various traffic data modeling and predicting methods, graph learning-based models attract more attention, because of their powerful representation ability for modeling spatial and temporal dependencies with graph neural networks. Despite their promising performance, several key problems have not been well addressed: 1) Sensed data are often noisy in many real transportation scenarios. 2) The spatio-temporal correlations of traffic data are complex and dynamic, especially for long-term modeling and predicting. In such cases, existing methods may not lead to satisfactory prediction results. In this paper, we aim at the above problems by exploring a Spatio-Temporal Heterogeneous Graph Neural Network With Multi-View Learning Framework(MVJGL) for traffic prediction. In particular, we first model different types of traffic features and construct multiple graph structures. Then, we design two parallel heterogeneous gated temporal convolution modules to extract long and short-term temporal dependencies from different traffic features, respectively. Moreover, we introduce parallel graph convolutions to cross-characterize the time-varying spatial dependencies of each view. Extensive experiment results on four real traffic datasets show the superior performance grain obtained by the proposed model. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Prediction models

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Earthquake monitoring and high-resolution velocity tomography for the central Longmenshan fault zone by a temporary dense seismic array

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Earth and Planetary Physics 2025年第2期9卷 239-252页

作者： ShaoBo Yang HaiJiang Zhang MaoMao Wang Ji Gao Shuaijun Wang BaoJin Liu XiWei Xu School of Carbon Neutrality Science and Engineering Anhui University of Science and TechnologyHefei 231131China Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei 230026China Institute of Tectonics and Geophysics College of OceanographyHohai UniversityNanjing 210098China Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

The Longmenshan(LMS) fault zone is located at the junction of the eastern Tibetan Plateau and the Sichuan Basin and is of great significance for studying regional tectonics and earthquake hazards. Although regional velocity models are available for the LMS fault zone, high-resolution velocity models are lacking. Therefore, a dense array of 240 short-period seismometers was deployed around the central segment of the LMS fault zone for approximately 30 days to monitor earthquakes and characterize fine structures of the fault zone. Considering the large quantity of observed seismic data, the data processing workflow consisted of deep learning-based automatic earthquake detection, phase arrival picking, and association. Compared with the earthquake catalog released by the China Earthquake Administration, many more earthquakes were detected by the dense array. Double-difference seismic tomography was adopted to determine V_(p), V_(s), and V_(p)/V_(s) models as well as earthquake locations. The checkerboard test showed that the velocity models have spatial resolutions of approximately 5 km in the horizontal directions and 2 km at depth. To the west of the Yingxiu–Beichuan Fault(YBF), the Precambrian Pengguan complex, where most of earthquakes occurred, is characterized by high velocity and low V_(p)/V_(s) values. In comparison, to the east of the YBF, the Upper Paleozoic to Jurassic sediments, where few earthquakes occurred, show low velocity and high V_(p)/V_(s) values. Our results suggest that the earthquake activity in the LMS fault zone is controlled by the strength of the rock compositions. When the high-resolution velocity models were combined with the relocated earthquakes, we were also able to delineate the fault geometry for different faults in the LMS fault zone.

关键词： Longmenshan fault zone dense seismic array deep learning double-difference seismic tomography seismic velocity model earthquake locations fault geometry

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Population structure and genetic diversity of hairfin anchovy(Setipinna tenuifilis)revealed by microsatellite markers

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Acta Oceanologica Sinica 2025年第1期44卷 138-146,I0012-I0014页

作者： Bingjian Liu Shan Tong Jiasheng Li Xun Jin Sixu Zheng Yunpeng Wang Luxiu Gao Taobo Feng Mingzhe Han Yifan Liu College of Marine Science and Technology Zhejiang Ocean UniversityZhoushan 316022China National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization Zhejiang Ocean UniversityZhoushan 316022China National Engineering Research Center for Facilitated Marine Aquaculture Zhejiang Ocean UniversityZhoushan 316022China

Microsatellite markers with polymorphic advantages are widely used in the exploration and utilization of marine fishery *** this study,16 polymorphic microsatellite markers were used to evaluate the diversity and population structure of Setipinna tenuifilis,a nearshore fish of economic and ecological value in the western Pacific Ocean and Indian *** genetic diversity of *** showed a high level[mean Na(number of alleles)is 23.25,mean Ho(observed heterozygosity)is 0.639,mean R_(a)(allelic richness)is 11.625,and the polymorphic information content(PIC)is 0.844]similar to other Clupeiformes fish *** nine wild *** populations showed significant differentiation(F_(ST)ranging from 0.00384 to 0.19346)and were generally divided into southern and northern populations based on genetic structure,except for the Zhoushan population,which exhibited genetic *** results provide fundamental but significant genetic insights for the management and conservation of *** fishery resources.

关键词： microsatellite population structure genetic diversity Setipinna tenuifili

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The Hugoniot curve and sound velocity of forsterite to 1200 GPa

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Geoscience Frontiers 2025年第1期16卷 313-320页

作者： Jian Song Liang Sun Huan Zhang Xiaoxi Duan Zanyang Guan Lu Zhang Xiaokang Feng Weiming Yang Hao Liu Mengsheng Yang Yulong Li Dong Yang Zhebin Wang Jiamin Yang Wenge Yang Toshimori Sekine Youjun Zhang Zongqing Zhao Zhongqing Wu Laboratory of Seismic and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China National Key Laboratory of Plasma Physics Laser Fusion Research Center(LFRC)Chinese Academy of Engineering PhysicsMianyang 621900China Center for High Pressure Science and Technology Advanced Research(HPSTAR) Shanghai 201203China Graduate School of Engineering Osaka UniversitySuitaJapan Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)PudongShanghai 201203China Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China National Geophysical Observatory at Mengcheng University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China

The comprehension of the composition and physical state of the deep interiors of large planets,as well as the impact events pertinent to planetary formation and evolution,necessitates an understanding of the properties of planetary materials under extreme ***(Mg2SiO4),a significant geological mineral,has not been fully characterized in terms of its behavior under shock compression due to a lack of consensus among previous experiments and simulations aimed at determining its Hugoniot,as well as the absence of knowledge of sound velocity at high pressures,a critical parameter indicative of phase transformation and *** this study,we delineated the Hugoniot curve of the mineral forsterite up to immense pressures of 1200 *** the first time,we successfully constrained its sound velocity along the Hugoniot curve up to 760 GPa by combining laser-driven shock experiments with first-principles molecular dynamics *** measured Hugoniot data for forsterite corroborated previous findings and suggested the occurrence of incongruent melting during shock ***,along their respective Hugoniot curves,the sound velocity of forsterite was observed to fall between that of the minerals bridgmanite and *** remarkable agreement between the experimental results and simulation data provides reliable sound velocity measurements on the forsterite Hugoniot,which is critical for comprehensively understanding the phase transition and melting behavior of forsterite under ultra-high *** knowledge sheds invaluable light on the behavior of this significant geological mineral under extreme conditions akin to those found in the interiors of planets.

关键词： Forsterite Hugoniot Sound velocity First-principles molecular dynamics Shock compression Lateral release

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Irradiated Pulsar Planets and Companions as 511 keV Positron Annihilation Line Sources

arXiv

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arXiv 2025年

作者： Metzler, Zachary Wadiasingh, Zorawar University of Maryland College Park United States NASA Goddard Space Flight Center United States Center for Research and Exploration in Space Science & Technology II United States

Millisecond pulsars (MSPs) are prolific GeV γ-ray emitters, and nearly 80% of Fermi-LAT MSPs reside in compact binaries. We demonstrate that the companions in these compact MSPs binaries are also 511 keV annihilation line emitters using MEGAlib simulations (a high energy radiation transport software built with Geant4) to compute the particle showers and resulting backsplash emission from the pulsar irradiation. The 511 keV signal exhibits strong flux modulation and red/blueshifts associated with a binary orbit, enabling powerful coherent searches. Measuring the 511 keV emission would enable direct γ-ray characterization of unusual pulsar exoplanets and companions, and allow one to identify the unambiguous presence of active pulsars whose beams do not intercept Earth. Intriguingly, the 511 keV flux is brightest for ultra-compact systems against which pulsar surveys are systematically biased. These ultra-compact systems are also possibly prime LISA galactic sources. This necessitates future joint LISA-MeV γ-ray techniques to characterize MSP binaries. These MSP binaries may also contribute to the puzzling source of the excess 511 keV photons near the galactic bulge and center. © 2025, CC BY-NC-ND.

关键词： Gamma rays

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A Communication Scene Recognition Framework Based on Deep Learning with Multi-Sensor Fusion

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China Communications 2025年第4期22卷 174-201页

作者： Feng Yufei Zhong Xiaofeng Chen Xinwei Zhou Shidong Department of Electronic Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Space Network and Communications(Tsinghua University) Beijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China

This paper presents a comprehensive framework that enables communication scene recognition through deep learning and multi-sensor *** study aims to address the challenge of current communication scene recognition methods that struggle to adapt in dynamic environments,as they typically rely on post-response mechanisms that fail to detect scene changes before users experience *** proposed framework leverages data from multiple smartphone sensors,including acceleration sensors,gyroscopes,magnetic field sensors,and orientation sensors,to identify different communication scenes,such as walking,running,cycling,and various modes of *** experimental comparative analysis with existing methods on the open-source SHL-2018 dataset confirmed the superior performance of our approach in terms of F1 score and processing ***,tests using a Microsoft Surface Pro tablet and a self-collected Beijing-2023 dataset have validated the framework's efficiency and generalization *** results show that our framework achieved an F1 score of 95.15%on SHL-2018and 94.6%on Beijing-2023,highlighting its robustness across different datasets and ***,the levels of computational complexity and power consumption associated with the algorithm are moderate,making it suitable for deployment on mobile devices.

关键词： communication scene recognition deep learning sensor fusion SHL smartphone-based applications

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