A5064989610- Ionosphere and magnetosphere dynamics
- GNSS positioning and interference
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Space Satellite Systems and Control
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Topological Materials and Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- earthquake and tectonic studies
- Meteorological Phenomena and Simulations
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- MXene and MAX Phase Materials
- Atmospheric aerosols and clouds
- Inertial Sensor and Navigation
- Advanced Optical Sensing Technologies
- Copper Interconnects and Reliability
- Spacecraft Design and Technology
- Seismic Waves and Analysis
- Space exploration and regulation
Hunan University of Science and Technology
2022-2025
Tongji University
2025
Xi'an Technological University
2022
RMIT University
2016-2022
Institut national de l’information géographique et forestière
2020-2022
Laboratoire d'Informatique Gaspard-Monge
2022
MIT University
2020
Mount Stromlo Observatory
2018-2019
China University of Mining and Technology
2017
Wuhan University
2013-2015
Using first-principles method within the framework of density functional theory, we study influence native point defect on structural and electronic properties Bi2Se3. Se vacancy in Bi2Se3 is a double donor, Bi triple acceptor. antisite (SeBi) always an active donor system because its level (ɛ(+1/0)) enters into conduction band. Interestingly, (BiSe1) amphoteric dopant, acting as when μe < 0.119 eV (the material typical p-type) acceptor > 0.251 n-type). The formation energies...
Abstract. Surface pressure is a necessary meteorological variable for the accurate determination of integrated water vapor (IWV) using Global Navigation Satellite System (GNSS). The lack observations big issue conversion historical GNSS observations, which relatively new area applications in climatology. Hence use surface derived from either blind model (e.g., Pressure and Temperature 2 wet, GPT2w) or global atmospheric reanalysis ERA-Interim) becomes an important alternative solution. In...
Abstract. The Global Positioning System (GPS) is a powerful atmospheric observing system for determining precipitable water vapour (PWV). In the detection of PWV using GPS, weighted mean temperature (Tm) crucial parameter conversion zenith tropospheric delay (ZTD) to since quality affected by accuracy Tm. this study, an improved voxel-based Tm model, named GWMT-D, was developed global reanalysis data over 4-year period from 2010 2013 provided United States National Centers Environmental...
Abstract Two solar flares accompanied by coronal mass ejections (CMEs) occurred on 24–25 February (DOY 055–056), 2023, resulting in a large magnetic storm DOY 058. We reconstructed the ionospheric electron density (IED) Europe to analyze spatial distribution of ionosphere and its temporal evolution during this period. Computerized tomography based machine learning (CIT‐ML) was used predict IEDs unobserved voxels. The were examined using observation data from Swarm satellite. CIT‐ML accuracy...
The ionospheric delay is of paramount importance to radio communication, satellite navigation and positioning. It necessary predict high-accuracy peak parameters for single frequency receivers. In this study, the state-of-the-art artificial neural network (ANN) technique optimized by genetic algorithm used develop global models predicting foF2 hmF2. are based on long-term multiple measurements including model (GIPFM) height (GIPHM). Predictions GIPFM GIPHM compared with International...
Atmospheric drag stands out as the predominant non-gravitational force acting on satellites in Low Earth Orbit (LEO), with altitudes below 2000 km. This exhibits a strong dependence thermospheric mass density (TMD), parameter of vital significance realms orbit determination, prediction, collision avoidance, and re-entry forecasting. A multitude empirical TMD models have been developed, incorporating contemporary data sources, including measurements obtained through onboard accelerometers LEO...
The total electron content (TEC) of ionosphere at low latitudes is significantly influenced by solar-geomagnetic activity and seasonal variations. Traditional ionospheric models often struggle to accurately forecast TEC in latitudes, which limits the improvement positioning accuracy for single-frequency GNSS (Global Navigation Satellite System) receivers. This study focuses on Sichuan Yunnan areas China that locate northern crest equatorial ionization anomaly, utilizing data from 48 stations...
Abstract The ionosphere plays an important role in satellite navigation, radio communication, and space weather prediction. However, it is still a challenging mission to develop model with high predictability that captures the horizontal‐vertical features of ionospheric electrodynamics. In this study, multiple observations during 2005–2019 from space‐borne global navigation system (GNSS) occultation (RO) systems (COSMIC FY‐3C) Digisonde Global Ionosphere Radio Observatory are utilized...
Abstract Two solar flares X2.2 and X9.3 erupted over the active region 2673 on 6 September 2017, second flare is strongest since 2005. In order to investigate ionospheric thermospheric responses two flares, global total electron content critical frequency of F2 layer obtained from GPS stations ionosondes are used. The results indicate that ionosphere in sunlit hemisphere increased significantly with magnitudes 0.1 0.5 units for respectively. density, neutral temperature simulated by...
Abstract Geomagnetic storms on 7–8 September 2017 triggered severe ionospheric disturbances that had a serious effect satellite navigation and radio communication. Multiple observations derived from Global Navigation Satellite System receivers, Earth's Magnetic Field Environment Explorers (SWARM) the Thermosphere‐Ionosphere ‐Electrodynamics General Circulation Model's simulations are utilized to investigate spatial‐temporal behaviors under storm conditions. The results indicate electron...
Abstract Many thermospheric mass density (TMD) variations have been recognized in observations and physical simulations; however, their impact on the low‐Earth‐orbit satellites has not fully evaluated. The present study investigates quantitative of periodic spatiotemporal TMD modulated by empirical DTM2013 model. Also considered are two small‐scale variations, that is, equatorial anomaly midnight maximum, which reproduced Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model....
In this study, radiosonde observations during the period of 2012-2013 from three stations in Hunan region, China, were used to establish regional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>m</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> models (RTMs) that are a fitting function multiple meteorological factors (<mml:math...
Nearly all star clusters younger than sim 600 Myr exhibit extended main sequence turnoffs and split sequences (MSs) in their color-magnitude diagrams. Works based on both photometry spectroscopy have clearly demonstrated that the red MS is composed of fast-rotating stars, whereas blue-MS stars are slow rotators. Nevertheless, mechanism responsible for formation stellar populations with varying rotation rates remains a topic debate. Potential mechanisms proposed include binary interactions,...
Global Navigation Satellite System (GNSS) radio occultation (RO) has been widely used in the prediction of weather, climate, and space particularly area tropospheric analyses. However, one issues with GNSS RO measurements is that they are interfered by signals reflected from earth's surface. Many events subject to such measurements, which considerably difficult extract measurements. To precisely identify events, an improved machine learning approach-a gradient descent artificial neural...
Precipitable water vapour (PWV) over a ground station can be estimated from the global navigation satellite systems (GNSS) signal's zenith wet delays (ZWD) multiplying by conversion factor that is function of weighted-mean temperature (Tm). The commonly used Bevis Tm model (BTM) may not perform well in some regions due to its use data North America development. In this study, radiosonde observations 2012 three stations - Changsha, Huaihua, Chenzhou Hunan province, China were establish new...