A5102918384- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Geotechnical Engineering and Underground Structures
- Scientific Research and Discoveries
- Hydraulic flow and structures
- Hydrology and Watershed Management Studies
- Seismic Waves and Analysis
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Landslides and related hazards
- Access Control and Trust
- Geotechnical Engineering and Analysis
- Geotechnical Engineering and Soil Stabilization
- Atmospheric Ozone and Climate
- SMEs Development and Digital Marketing
- Seismic Performance and Analysis
- Advanced Fiber Laser Technologies
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Nanocomposite Films for Food Packaging
Chinese Research Academy of Environmental Sciences
2022-2025
Purple Mountain Observatory
2013-2024
Chinese Academy of Sciences
2019-2024
Beijing Normal University
2024
Dalian Polytechnic University
2024
Chang'an University
2020-2023
Fujian Agriculture and Forestry University
2022
National Astronomical Observatories
2019-2021
Hebei University of Science and Technology
2018
Anhui Agricultural University
2017
Abstract There are expected to be physical relationships between the globular clusters (GCs) and stellar substructures in Milky Way, not all of which have yet been found. We search for such from a combined halo sample SDSS blue horizontal-branch SDSS+LAMOST RR Lyrae stars, cross-matched with astrometric information Gaia DR2. This is old stars also excellent tracers structures, ideal searching ancient relics outer halo. By applying neural-network-based method S tar GO full 4D dynamical space...
Changes in physicochemical characteristics, chemical structures and maturity of swine, cattle chicken manures composts during 70-day composting without addition bulking agents were investigated. Physicochemical characteristics measured by routine analyses solid-state 13C NMR FT-IR. Three distinct properties. Their changes structures, different not only from each other but also those with composting. Aromaticity manure decreased at first, then increased whereas that swine increased. Enhanced...
We develop a new method StarGO (Stars' Galactic Origin) to identify the galactic origins of halo stars using their kinematics. Our is based on self-organizing map (SOM), which one most popular unsupervised learning algorithms. combines SOM with novel adaptive group identification algorithm essentially no free parameters. In order evaluate our model, we build synthetic stellar from mergers nine satellites in Milky Way. construct mock catalogue by extracting heliocentric volume 10 kpc...
Abstract We combine the power of two stream-searching tools, STREAMFINDER and StarGO applied to Gaia EDR3 data, detect stellar debris belonging Cetus stream system that forms a complex, nearly polar structure around Milky Way. In this work, we find southern extensions northern as Palca new stream, which overlap on sky but have different distances. These wraps extend over more than ∼100° (−60° < δ +40°). The current N -body model reproduces both in trailing arm. also show is confidently...
Abstract The first source catalog of the Large High Altitude Air Shower Observatory (LHAASO) reported detection a very high energy gamma-ray source, 1LHAASO J1219+2915. This Letter presents further detailed study spectral and temporal behavior this pointlike source. best-fit position TeV (R.A. = 185.°05 ± 0.°04, decl. 29.°25 0.°03) is compatible with NGC 4278 within ∼0.°03. Variation analysis shows an indication variability on timescale few months in band, which consistent low-frequency...
Environmental DNA (eDNA) metabarcoding is a powerful method for monitoring aquatic biodiversity and evaluating ecosystem health. In this study, we applied eDNA multi-species biotic integrity index (Mt-IBI), constructed by selecting screening core metrics to capture key ecological responses, assess the Irtysh River Basin in Xinjiang, China, analyzing samples from 52 sites. The community structure showed high sensitivity environmental stressors, with dissolved oxygen (DO), total nitrogen (TN),...
Cosmological simulations indicate that nearly half of the baryons in nearby Universe are warm-hot intergalactic medium (WHIM) phase, and about a them reside cosmic filaments connecting galaxy clusters. Recent observational studies using stacked survey data deep exposures cluster outskirts have detected soft X-ray excesses associated with optically identified filaments. However, physical characteristics WHIM remain largely undetermined due to lack direct spectral diagnostics individual...
In this paper we study the tidal stripping process for satellite galaxies orbiting around a massive host galaxy, and focus on its dependence morphology of both galaxy. For purpose, use three different morphologies satellites: pure disc, bulge mixture bulge+disc. Two are used galaxies: bulge+disc bulge. We find that while spheroidal stellar component experiences constant power-law like mass removal, disc is exposed to an exponential loss when radius same order scale length. This dramatic able...
ABSTRACT We perform analysis of the 3D kinematics Milky Way disc stars in mono-age populations. focus on between Galactocentric distances R = 6 and 14 kpc, selected from combined LAMOST Data Release 4 (DR4) red clump giant Gaia DR2 proper motion catalogue. confirm asymmetrical motions recent works provide time tagging Galactic outer near anticentre direction out to kpc. Radial reach values up 10 km s−1, depending age population, present a north–south asymmetry region corresponding density...
We present new evidence for eight early-type galaxies (ETGs) from the CALIFA Survey that show clear rotation around their major photometric axis ("prolate rotation"). These are LSBCF560-04, NGC 0647, 0810, 2484, 4874, 5216, 6173 and 6338. Including 5485, a known case of an ETG with stellar prolate rotation, as well UGC 10695, further possible candidate we report ten in total such feature kinematics. Prolate rotators correspond to ~9% volume-corrected sample ETGs, fraction much higher than...
Abstract We characterize the kinematic and chemical properties of ∼3000 Sagittarius (Sgr) stream stars, including K-giants, M-giants, blue horizontal branch stars (BHBs), selected from SEGUE-2, Large Sky Area Multi-Object Fibre Spectroscopic Telescope, Sloan Digital Survey separately in Integrals-of-Motion space. The orbit Sgr is quite clear velocity vector X – Z plane. Stars traced by K-giants M-giants show that apogalacticon trailing steam ∼100 kpc. metallicity distributions BHBs indicate...
Context: In our Paper I, by using statistical deconvolution methods, extended kinematics maps of Gaia-DR2 data have been produced in a range heliocentric distances that are factor two to three larger than those analyzed previously the Gaia Collaboration with same data. It added Galactocentric between 13 kpc and 20 previous maps. Aims: Here, we investigate dynamical effects different mechanisms can explain radial vertical components these kinematic maps, including decomposition bending...
Open Clusters are born and evolve along the Milky Way plane, on them is imprinted history of Galactic disc, including chemical dynamical evolution. Chemical properties open clusters can be derived from photometric, spectroscopic, astrometric data their member stars. Based photometric Gaia mission, membership stars in more than 2000 has been identified literature. The kinematical properties, however, still poorly known for many these clusters. In synergy with large spectroscopic survey LAMOST...
On 9 October 2022, the Large High Altitude Air Shower Observatory (LHAASO) reported observation of very early TeV afterglow brightest-of-all-time gamma-ray burst 221009A, recording highest photon statistics in band ever obtained from a burst. We use this unique to place stringent constraints on energy dependence speed light vacuum, manifestation Lorentz invariance violation (LIV) predicted by some quantum gravity (QG) theories. Our results show that 95% confidence level lower limits QG...
Abstract We use a novel cluster identification tool, S tar GO, to explore the metal-poor ([Fe/H] < −1.5) outer stellar halo ( d > 15 kpc) of Milky Way using data from Gaia , LAMOST, and SDSS. Our method is built an unsupervised learning algorithm, self-organizing map, which trains 2D neural network learn topological structures set n-D input space. Using 4D space angular momentum orbital energy, we identify three distinct groups corresponding Sagittarius, Orphan, Cetus Streams. For...
ABSTRACT We predict the dwarf galaxy detection limits for upcoming Chinese Space Station Telescope (CSST) survey that will cover 17 500 ${\rm \, deg}^{2}$ of sky with a wide field view 1.1 deg2. The point-source depth reaches 26.3 mag in g band and 25.9 i band. Constructing mock data based on designed photometric bands, we estimate recovery rate artificial galaxies from catalogues. these is strongly dependent their distance, magnitude, size, agreement searches current surveys. expect CSST to...
We investigate the three-dimensional asymmetrical kinematics and present time stamps of Milky Way disk between Galactocentric distances $R=12$ 15 \,kpc, using red clump stars selected from LAMOST Galactic survey, also with proper motion measurements provided by Gaia DR2. discover velocity substructure above plane corresponding to a density dip found recently ("south-middle opposite" structure[R $\sim$ 12-15 Z 1.5 \,kpc] discovered in \citet{Wang2018b, Wang2018c}) radial azimuthal velocity....
Abstract We revisit the diagonal ridge feature (diagonal distributions in R , v ϕ plane) found Gaia and present a timing analysis for it between Galactocentric distances of = 7.5 12 kpc, using main-sequence turnoff OB stars selected from LAMOST Galactic spectroscopic surveys. recover pattern – plane color coded by mean radial velocity find that this is presented very young (OB stars, few hundred megayears) to old populations ( τ 9–14 Gyr). Meanwhile, some features are also revealed...
Abstract We construct a large halo K-giant sample by combining the positions, distances, radial velocities, and metallicities of over 13,000 LAMOST DR5 K giants with Gaia DR2 proper motions, which covers Galactocentric distance range 5–120 kpc. Using position–velocity clustering estimator (the 6Distance), we statistically quantify presence substructure at high significance: have more close pairs in space than smooth stellar halo. find that amount increases increasing metallicity. With...
Abstract In this Letter, we report the discovery of an intriguing hypervelocity star (HVS; J1443+1453) candidate that is probably from Sagittarius Dwarf Spheroidal galaxy (Sgr dSph). The old and very metal-poor low-mass main-sequence turn-off (age ∼14.0 Gyr [Fe/H] = −2.23 dex) has a total velocity km s −1 in Galactic rest frame heliocentric distance kpc. J1443+1453 larger than escape speed at its position, suggesting it promising HVS candidate. By reconstructing trajectory potential, find...
Chitin is a polysaccharide similar to cellulose that contains abundant hydrogen bonds. Expansin-like proteins disrupt bond networks, causing swell and accelerating its degradation. We examined the effects of pretreatment with two expansin-like proteins, CxEXL22 (
Abstract The gravitational interactions between the LMC and Milky Way cause dynamical perturbations in MW halo, leading to biased distributions of stellar density kinematics. We run 50 high-resolution N-body simulations exploring varying masses halo shapes study evolution LMC-induced perturbations. By measuring mean velocities simulated stars, we identify a discontinuity first-infall second-passage scenarios LMC’s orbital history. In first-infall, Galactocentric latitudinal velocity hovers...