A5101553712- Soil Moisture and Remote Sensing
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Radio Astronomy Observations and Technology
- Precipitation Measurement and Analysis
- Arctic and Antarctic ice dynamics
- Maritime Navigation and Safety
- Cryospheric studies and observations
- Astrophysics and Cosmic Phenomena
- Atmospheric and Environmental Gas Dynamics
- Mechanical and Optical Resonators
- Analytical Chemistry and Sensors
- Time Series Analysis and Forecasting
- Photonic and Optical Devices
- Target Tracking and Data Fusion in Sensor Networks
- Microwave Imaging and Scattering Analysis
- COVID-19 epidemiological studies
- Sparse and Compressive Sensing Techniques
- Maritime Security and History
- Spacecraft and Cryogenic Technologies
- Fluid Dynamics and Thin Films
- SARS-CoV-2 and COVID-19 Research
- Indoor and Outdoor Localization Technologies
- Medical Research and Treatments
- Radio Wave Propagation Studies
- Stock Market Forecasting Methods
Chinese Academy of Sciences
2016-2025
Shanghai Advanced Research Institute
2025
ShanghaiTech University
2025
National Space Science Center
2015-2024
Institute of Computing Technology
2013-2024
Fujian Medical University
2024
Shanghai Children's Medical Center
2024
Hefei Institutes of Physical Science
2024
Institute of Solid State Physics
2024
Chinese Academy of Meteorological Sciences
2023
Mapping global shipping density, including vessel density and traffic is important to reveal the distribution of ships traffic. The Automatic Identification System (AIS) an automatic reporting system widely installed on initially for collision avoidance by their kinematic identity information continuously. An algorithm was created account errors in data when ship tracks seem ‘jump’ large distances, artefact resulting from use duplicate identities. maps, as well AIS receiving frequency were...
Multivariate time series long-term prediction, which aims to predict the change of data in a long time, can provide references for decision-making. Although transformer-based models have made progress this field, they usually do not make full use three features multivariate series: global information, local and variables correlation. To effectively mine above establish high-precision prediction model, we propose double sampling transformer (DSformer), consists (DS) block temporal variable...
Due to ionosphere absorption and the interference of natural artificial radio emissions, astronomical observation from ground becomes very difficult at wavelengths decametre or longer, which we shall refer as ultralong wavelengths. This unexplored part electromagnetic spectrum has potential for great discoveries, notably in study cosmic dark ages dawn, but also heliophysics space weather, planets exoplanets, ray neutrinos, pulsar interstellar medium (ISM), extragalactic sources, so on. The...
X-ray free electron lasers (XFELs) are the new generation of particle accelerator-based light sources, capable producing tunable, high-power pulses that increasingly vital across various scientific disciplines. Recently, continuous-wave (CW) XFELs driven by superconducting linear accelerators have garnered significant attention due to their ability enhance availability supporting multiple undulator lines simultaneously. However, different typically require distinct beam qualities,...
Abstract Reconstructing the signal from measured visibilities in radio interferometry is an ill-posed inverse problem. In this paper, we present a novel radio-interferometric imaging method based on wavelet tight frame aimed at efficiently obtaining accurate solution. our approach, sparsely represented by directional tensor product complex framelets, which can effectively capture texture and shape features of images. To enhance computational efficiency, employ projected fast iterative...
Filament eruptions are considered to be a common phenomenon on the Sun and other stars, yet they rarely directly imaged in meter decimeter wavebands. Using imaging data from DAocheng solar Radio Telescope (DART) 150--450 MHz frequency range, we present two eruptive filaments that manifest as radio dimmings (i.e., emission depressions). Simultaneously, portions of these discernible dark features chromospheric images. The sun-as-a-star flux curves brightness temperature, derived DART images,...
Abstract The reconstruction from the measured visibilities to signal in radio interferometry is an ill-posed inverse problem. compressed sensing technology represented by sparsity averaging reweighted analysis (SARA) has been successfully applied radio-interferometric imaging. However, traditional SARA algorithm solves L 1 norm minimization problem instead of 0 one, which a bias In this paper, q proximal gradient with < proposed ameliorate and obtain accurate solution interferometry....
X-ray free electron lasers (XFELs) are the new generation of particle accelerator-based light sources, capable producing tunable, high-power pulses that increasingly vital across various scientific disciplines. Recently, continuous-wave (CW) XFELs driven by superconducting linear accelerators have garnered significant attention due to their ability enhance availability supporting multiple undulator lines simultaneously. In this paper, we introduce a novel delay system comprising four...
Land-sea contamination observed in Soil Moisture and Ocean Salinity (SMOS) brightness temperature images is found to have two main contributions: the floor error inherent of image reconstruction a multiplicative either antenna or visibility samples measured by correlator. The origin this last one traced down SMOS calibration parameters yield simple correction scheme, which validated against several geophysical scenarios. Autoconsistency rules interferometric synthesis together with redundant...
This work investigates the effects of time-varying media, where optical properties change over time, on electromagnetic wave propagation, focusing plane waves and free-electron evanescent waves. We introduce a switching parameter, $\tau$, to model ultrafast in femtosecond nanosecond range. For plane-wave incidence at angular frequency $\omega_0$, we derive generalized expression for backward-to-forward flux ratio as function $\omega_0$ aligning with recent experimental data providing unified...
Sea surface salinity (SSS) plays an important role in global water cycle. In recent years, satellite based remote sensing has proven to be a promising approach for SSS observation. A new payload concept, named MICAP (microwave imager combined active and passive), been introduced this paper. is suit of active/passive instrument package, which includes L/C/K band one-dimensional MIR interferometric radiometer) L-band DBF (digital beamforming) scatterometer, sharing parabolic cylinder...
Abstract Van der Waals heterostructures (vdWHs) consisting of 2D materials offer a practical and effective approach for engineering multifunctional, high‐performance photodetectors. However, vdWHs photodetectors based on photoconductive effects require an external power input are often accompanied by large dark current, which hinders the development miniaturization portability devices greatly limits application in complex environments. Herein, self‐powered photodetector constructed from...
Considering that ports are key nodes of the maritime transport network, it is great importance to identify ships’ arrivals and departures. Compared with partial proprietary data from a port authority or shipping company, approaches based on compulsory Automatic Identification System (AIS) reported by ships can produce transparent datasets covering wider areas, which necessary for researchers policy makers. Detecting calls trajectory difficult problem due huge uncertainty inherent in...
ABSTRACT Ground-based observation at frequencies below 30 MHz is hindered by the ionosphere of Earth and radio frequency interference. To map sky these low frequencies, we have proposed Discovering Sky Longest wavelength mission (DSL, also known as ‘Hongmeng’ mission, which means ‘Primordial Universe’ in Chinese) concept, employs a linear array micro-satellites orbiting Moon. Such an can make interferometric observations achieving good angular resolutions despite small size antennas....
Modeling the outbreak of a novel epidemic, such as coronavirus disease 2019 (COVID-19), is crucial for estimating its dynamics, predicting future spread and evaluating effects different interventions. However, there are three issues that make this modeling challenging task: uncertainty in data, roughness models, complexity programming. We addressed these by presenting an interactive individual-based simulator, which capable epidemic through multi-source information fusion. The first...
Abstract At this stage, due to the increasing use of electric vehicles, position vehicle load scheduling in grid power is becoming more and important. Effective dispatching can balance peak-valley difference dispatching, increase supply utilization rate reduce pressure line transformer. The forecast describe user’s electricity consumption habits next period time, provide important data basis for dispatching. This paper summarizes research status charging load, analyzes traditional methods,...
Synthetic aperture imaging radiometers (SAIRs) are powerful passive microwave systems for high-resolution by use of synthetic technique. However, the ill-posed inverse problem SAIRs makes it difficult to reconstruct high-precision brightness temperature map. The traditional regularization methods add a unique penalty all frequency bands solution, which may cause reconstructed result be too smooth retain certain features original map such as edge information. In this paper, multi-parameter...
低频射电探测任务构想——鸿蒙计划旨在利用多颗卫星绕月编队形成超长波天文观测阵列,在月球背面开展空间低频射电天文探测。其科学目标是高精度测量全天射电频谱,揭示宇宙黑暗时代与黎明的演化历史;实现首次高分辨率超长波巡天,打开最后一个电磁窗口;观测太阳和行星超长波活动,揭示空间环境相互作用规律。该任务将获得超长波频段全天空图像,获取超长波波段天文射电源的强度、频谱、分布等信息。这些科学数据对于探索宇宙黑暗时代和黎明时代、研究银河系星际介质、宇宙线起源与传播、河外射电星系、类星体和星系团的演化、太阳活动与行星磁场等,具有重要的科学价值。