Yanan Wang
A5100385403- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Mechanics and Biomechanics Studies
- Ionosphere and magnetosphere dynamics
- Stellar, planetary, and galactic studies
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Superconducting and THz Device Technology
- Galaxies: Formation, Evolution, Phenomena
- Nanoplatforms for cancer theranostics
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Anesthesia and Neurotoxicity Research
- Fluid Dynamics and Vibration Analysis
- Adaptive optics and wavefront sensing
- Neutrino Physics Research
- Social Media and Politics
- Second Language Acquisition and Learning
- Underwater Vehicles and Communication Systems
National Astronomical Observatories
2023-2025
Chinese Academy of Sciences
2012-2025
Nanjing University
2025
82th Hospital of Pla
2025
University of Southampton
2018-2024
Fujian Agriculture and Forestry University
2024
People's Liberation Army 401 Hospital
2024
University of Science and Technology of China
2024
Ocean University of China
2021-2023
Huazhong University of Science and Technology
2023
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, also called the Guo Shou Jing Telescope) is a special reflecting Schmidt telescope. LAMOST's design allows both large aperture (effective of 3.6 m–4.9 m) and wide field view (FOV) (5°). It has an innovative active configuration which continuously changes mirror's surface that adjusts during observation process combines thin deformable mirror optics with segmented optics. Its primary (6.67 m × 6.05 (5.74m 4.40m) are...
This paper describes the data release of LAMOST pilot survey, which includes reduction, calibration, spectral analysis, products and access. The accuracy released information about FITS headers spectra are also introduced. set 319 000 a catalog these objects.
Abstract We present a search for luminous, long-duration ambiguous nuclear transients (ANTs) similar to the unprecedented discovery of extreme, event AT2021lwx with >150 d rise time and luminosity 1045.7 erg s−1. use Lasair transient broker Zwicky Transient Facility (ZTF) data lasting more than one year exhibiting smooth declines. Our returns 59 events, seven which we classify as ANTs assumed be driven by accretion onto supermassive black holes. propose remaining 52 are stochastic...
Abstract Calcium overload and ROS overproduction, two major triggers of acute kidney injury (AKI), are self‐amplifying mutually reinforcing, forming a complicated cascading feedback loop that induces cell “suicide” ultimately renal failure. There currently no clinically effective drugs for the treatment AKI, excluding adjuvant therapy. In this study, porous silicon‐based nanocarrier rich in disulfide bond skeleton (<50 nm) is developed enables efficient co‐loading hydrophilic drug borane...
Abstract When a star passes through the tidal disruption radius of massive black hole (BH), it can be torn apart by force BH, known as event (TDE). Since observed UV/optical luminosity significantly exceeds predictions compact disk model in classical TDE theory, two competing models, stream collision and envelope reprocessing, have been proposed to address this discrepancy. To distinguish between these we investigated continuum reverberation behaviors for ~30 TDEs with high-quality multiband...
Abstract A plasma density model of the inner magnetosphere is important for a variety applications including study wave‐particle interactions, and wave excitation propagation. Previous empirical models have been developed under many limiting assumptions do not resolve short‐term variations, which are especially during storms. We present three‐dimensional dynamic electron (DEN3D) using feedforward neural network with densities obtained from four satellite missions. The DEN3D takes spacecraft...
Calcium overload is one of the early determinants core cellular events that contribute to pathogenesis acute kidney injury (AKI), which include oxidative stress, ATP depletion, calcium overload, and inflammatory response with self-amplifying interactive feedback loops ultimately lead renal failure. Excluding adjuvant therapy, there are currently no approved pharmacotherapies for treatment AKI. Using an adipic dihydride linker, we modified hyaluronic acid polymer chain a potent antioxidant,...
We present results from a new three‐dimensional empirical magnetopause model based on 15,089 crossings 23 spacecraft. To construct the model, we introduce Support Vector Regression Machine (SVRM) technique with systematic approach that balances smoothness fitting accuracy to produce reveals manner in which size and shape of depend upon various control parameters without any assumptions concerning analytical magnetopause. The fits data used modeling very accurately, can guarantee similar when...
ABSTRACT We present a systematic analysis of the phase lags associated with type-C quasi-periodic oscillations (QPOs) in GRS 1915+105 using RXTE data. Our sample comprises 620 observations QPOs ranging from ∼0.4 to ∼6.3 Hz. Based on our analysis, we confirm that QPO decrease frequency, and change sign positive negative at frequency ∼2 In addition, find slope this relation is significantly different between below above 2 The rms can be well fitted broken line: as go positive, first increases,...
ABSTRACT We report on the Insight-HXMT observations of new black hole X-ray binary MAXI J1820+070 during its 2018 outburst. Detailed spectral analysis via continuum fitting method shows an evolution inferred spin high soft sate. Moreover, hardness ratio, non-thermal luminosity and reflection fraction also undergo evolution, exactly coincident to period when transition takes place. The unphysical is attributed inner disc, which caused by collapse a hot corona due condensation mechanism or may...
The Space Technology 5 (ST‐5) mission successfully placed three micro‐satellites in a 300 × 4500 km dawn‐dusk orbit on 22 March 2006. Each spacecraft carried boom‐mounted vector fluxgate magnetometer that returned highly sensitive and accurate measurements of the geomagnetic field. These data allow, for first time, separation temporal spatial variations field‐aligned current (FAC) perturbations measured low‐Earth time scales ∼10 sec to 10 min. constellation are used directly determine sheet...
Abstract We present the evolution of phase lags associated with type-C QPO in GX 339–4 during rising 2006/2007 outburst. find that at frequency are always positive (hard) and show very different behavior between QPOs frequencies below above ∼1.7 Hz: when is Hz, increase both energy, while remain more or less constant. When higher than a broad feature lag–energy spectra around 6.5 keV, suggesting reflection component may have significant contribution to lags. Below rms first decreases energy...
We study the evolution of temporal properties MAXI 1820+070 during 2018 outburst in its hard state from MJD 58190 to 58289 with Insight-HXMT a broad energy band 1-150 keV. find different behaviors hardness ratio, fractional rms and time lag before after 58257, suggesting transition occurred at around this point. The observed lags between soft photons 1-5 keV higher bands, up 150 keV, are frequency-dependent: low-frequency range, 2-10 mHz, both timescale dozens seconds but without clear trend...
Abstract We study the spectral evolution of black hole candidate EXO 1846−031 during its 2019 outburst, in 1–150 keV band, with Hard X-ray Modulation Telescope. The continuum spectrum is well modeled an absorbed disk-blackbody plus cutoff power law, hard, intermediate, and soft states. In addition, we detect ≈6.6 Fe emission line hard intermediate state. Throughout states, fitted inner disk radius remains almost constant; suggest that it has settled at innermost stable circular orbit (ISCO)....
Abstract AT 2019azh is a H+He tidal disruption event (TDE) with one of the most extensive ultraviolet and optical data sets available to date. We present our photometric spectroscopic observations this starting several weeks before out approximately 2 yr after g -band's peak brightness combine them public data. This set robustly reveals change in light-curve slope possible bump rising light curve TDE for first time, which may indicate more than dominant emission mechanism contributing...
A black hole (BH) can tear apart a star that ventures within its tidal radius, producing luminous flare as the stellar debris falls back, known disruption event (TDE). While TDEs in quiescent galaxies are relatively well understood, identifying active galactic nuclei (AGN) still remains significant challenge. We present discovery of AT2021aeuk, transient exhibiting dual flares around three years narrow-line Seyfert 1 galaxy. Multi-wavelength observations triggered during second 2023 revealed...
Abstract A black hole (BH) can tear apart a star that ventures within its tidal radius, producing luminous flare as the stellar debris falls back, known disruption event (TDE). While TDEs in quiescent galaxies are relatively well understood, identifying active galactic nuclei (AGNs) still remains significant challenge. We present discovery of AT2021aeuk, transient exhibiting dual flares around 3 yr narrow-line Seyfert 1 galaxy. Multiwavelength observations triggered during second 2023...
This study aims to investigate the value of a radiomics nomogram based on magnetic resonance imaging (MRI) in distinguishing vertebral compression fractures (VCFs) from osteomyelitis (VOs). We conducted retrospective analysis clinical data 100 patients with VCFs and VOs, respectively at our hospital. The cases were randomly divided into training (n = 140) testing sets 60) 7:3 ratio. Two experienced radiologists outlined regions interest (ROI) MRI images using T2-weighted fat suppression...