A5109173956- Seismic Imaging and Inversion Techniques
- Planetary Science and Exploration
- Seismic Waves and Analysis
- Astro and Planetary Science
- Geophysical Methods and Applications
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Meteorological Phenomena and Simulations
- Hydraulic Fracturing and Reservoir Analysis
- Laser-Plasma Interactions and Diagnostics
- Space Science and Extraterrestrial Life
- Geology and Paleoclimatology Research
- Electromagnetic Simulation and Numerical Methods
- Methane Hydrates and Related Phenomena
- Pulsars and Gravitational Waves Research
- Crystallization and Solubility Studies
- Underwater Acoustics Research
- Electrostatic Discharge in Electronics
- X-ray Diffraction in Crystallography
- Geophysics and Gravity Measurements
- Seismology and Earthquake Studies
- Image and Signal Denoising Methods
- Advanced Numerical Methods in Computational Mathematics
- Inertial Sensor and Navigation
- Drilling and Well Engineering
Chinese Academy of Sciences
2016-2025
Institute of Geology and Geophysics
2016-2025
Ludong University
2025
Northwest Institute of Nuclear Technology
2015-2024
Shantou University
2019-2024
First Affiliated Hospital of Shantou University Medical College
2019-2024
Institute of Physics
2021-2024
Research Institute for Pharmacy and Biochemistry (Czechia)
2024
Zhengzhou University of Light Industry
2023-2024
Shandong Jiaotong University
2011-2023
Abstract Exploring the subsurface structure and stratification of Mars advances our understanding Martian geology, hydrological evolution palaeoclimatic changes, has been a main task for past continuing exploration missions 1–10 . Utopia Planitia, smooth plains volcanic sedimentary strata that infilled impact crater, prime target such as it is inferred to have hosted an ancient ocean on 11–13 However, 45 years passed since Viking-2 provided ground-based detection results. Here we report in...
High-resolution image and waveform inversion of small-scale targets requires the handling high-frequency seismic wavefields. However, conventional finite-difference (FD) methods have strong numerical dispersions in presence components. To reduce these dispersions, we optimized constant coefficients FD operator by maximizing wavenumber coverage within a given error limitation. We set up three general criteria to enhance convergence algorithm optimization effort. selected limitation be 0.0001,...
Significance After the Apollo and Luna missions, which were flown about 40 years ago, Moon was explored only from orbit. In addition, no samples returned young high-FeO TiO 2 mare basalt in northern Imbrium basin. Such are important to understand formation evolution of Procellarum KREEP [potassium (K), rare earth elements (REE), phosphorus (P)] terrain, a key terrain highly enriched radioactive nuclides. The Chang’e-3 mission carried out first situ analyses chemical mineral compositions...
Conventional explicit finite-difference methods have difficulties in handling high-frequency components due to strong numerical dispersions. One can reduce the dispersions by optimizing constant coefficients of operator. Different from traditional optimized schemes that use 2-norm and least squares, we propose construct objective functions using maximum norm solve simulated annealing algorithm. Both theoretical analyses experiments show our scheme is superior with regard following three...
Absorbing boundary conditions are necessary in numerical simulation for reducing the artificial reflections from model boundaries. In this paper, we overview most important and typical absorbing developed throughout history. We first derive wave equations of similar methods unified forms; then, compare their performance via theoretical analyses experiments. The Higdon condition is shown to be best one among three main that based on a one-way equation. Clayton Engquist special case but has...
Abstract Chang’E-4 landed in the South Pole-Aitken (SPA) basin, providing a unique chance to probe composition of lunar interior. Its landing site is located on ejecta strips Von Kármán crater that possibly originate from neighboring Finsen crater. A surface rock and regolith at 10 sites along rover Yutu-2 track were measured by onboard Visible Near-Infrared Imaging Spectrometer first three days mission operations. In situ spectra have peak band positions 1 2 μm, similar spectral data Moon...
New samples returned by China Chang'e-5 (CE-5) mission offer an opportunity for studying the lunar geologic longevity, space weathering, and regolith evolution. The age determination of CE-5 was among first scientific questions to be answered. However, precious samples, most in micrometer size range, challenge many traditional analyses on large single crystals zircon developed massive bulk samples. Here, we a non-destructive rapid screening individual zirconium-containing particle isotope...
Abstract As the largest basin on Mars, Utopia Planitia has both experienced and recorded variations of Martian palaeoclimate. Layered subsurface structures have been identified by ground-penetrating radar in southern but lateral subsurface, potentially linked to palaeoclimatic evolution, not investigated. Here we report frequency-variation patterns Zhurong reflections interpret them as buried polygonal terrain below a depth 35 m. Sixteen wedges were within ∼1.2 km distance, suggesting wide...
To explore the worldwide, regional, and country-specific burden of early-onset colorectal cancer (EO-CRC) identify its associated risk factors between 1990 2021, to project incidence mortality rates for 2036. We acquired data on EO-CRC categorized by gender, socio-demographic index (SDI), based Global Burden Disease (GBD) Study 2021. Joinpoint regression analysis was utilized variation in disease burden. The autoregressive integrated moving average (ARIMA) model performed forecast up...
The recent increasing interest in detecting gravitational waves (GWs) by lunar seismic measurement urges us to have a clear understanding of the response moon passing GWs. In this paper, we clarify relationship between two seemingly different functions which been derived previously using methods, one taking field-theory approach and other tidal force induced We revisit their derivation prove, both analytical arguments numerical calculations, that are equivalent. Their apparent difference can...
Abstract The periodicities of earthquake occurrences are critical for understanding the mechanism nucleation and triggering, yet it remains a topic ongoing discussion. Here, we develop an annual spectral averaging method to extract potential from Japan Meteorological Agency catalog. Unlike previous methods, such as Schuster’s test or Schuster spectrum our neither relies on tidal phase information nor requires prior knowledge assumed periodicities. We simultaneously identified two...
The northern lowlands of early Mars could have contained a significant quantity liquid water. However, the ocean hypothesis remains controversial due to lack conclusive evidence from Martian subsurface. We use data Zhurong Rover Penetrating Radar on southern Utopia Planitia identify subsurface dipping reflectors indicative an ancient prograding shoreline. dip unidirectionally with inclinations in range 6° 20° and are imaged thickness 10 35 m along uninterrupted 1.3 km northward...
The Martian subsurface structure archives the magmatic activity, sedimentary processes, and meteorite impact history of Mars, making it a promising region for investigating geological evolution ancient water activities planet. On 15 May 2021, China’s first Mars mission, Tianwen-1, successfully landed on south Utopia Planitia released Zhurong rover to in-situ detect with equipped ground penetrating radar (Rover Penetrating Radar, RoPeR). Using low-frequency channel data recorded...
Martian polygonal terrain, widely distributed on the surface, provides valuable geological insights into environmental conditions during their formation, including aspects related to thermal and possibility of past aqueous activity Mars. First, we provide an overview terrain Mars, distribution, size, possible formation mechanisms. Second, in order quantitatively analyze geometric features relationship with ancient climate process images from High-Resolution Imaging Science Experiment...
China’s first Mars exploration mission, Tianwen-1, was launched on 23 July 2020 and achieved orbiting 10 February 2021, landing 15 May roving 22 2021. Here we outline the major research progress made during Tianwen-1 drawing insights from both Zhurong rover orbiter. The has performed in-situ characterization of geomorphological features, surface subsurface geology, magnetic field, chemical compositions along its ~1.9-km traverse to south in southern Utopia Planitia, Mars....