A5011647715- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Magnetic Field Sensors Techniques
- Physics of Superconductivity and Magnetism
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Astrophysical Phenomena and Observations
- Cerebrovascular and Carotid Artery Diseases
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Cerebrovascular and genetic disorders
- Intracranial Aneurysms: Treatment and Complications
- Moyamoya disease diagnosis and treatment
- Spectroscopy and Laser Applications
- Air Quality and Health Impacts
- Neural Networks and Applications
- Marine and coastal ecosystems
- Sensor Technology and Measurement Systems
- Frequency Control in Power Systems
- Spectroscopy and Chemometric Analyses
- Magnetic Bearings and Levitation Dynamics
- Blind Source Separation Techniques
Chinese Academy of Sciences
2016-2025
Institute of Electrical Engineering
2018-2025
Henan Cancer Hospital
2025
Zhengzhou University
2025
Chinese Research Academy of Environmental Sciences
2023-2024
Chinese Institute for Brain Research
2020-2024
Institute of Biophysics
2019-2024
University of Chinese Academy of Sciences
2010-2024
Research Center for Eco-Environmental Sciences
2023-2024
Huashan Hospital
2024
The Large sky Area Multi-Object Spectroscopic Telescope (LAMOST) General Survey is a spectroscopic survey that will eventually cover approximately half of the celestial sphere and collect 10 million spectra stars, galaxies QSOs. Objects both in pilot first year general are included LAMOST First Data Release (DR1). started October 2011 ended June 2012, data have been released to public as Pilot August 2012. September completed its operation 2013. DR1 includes total 1202 plates containing...
Aims. We provide an easy-to-use full-spectrum fitting package and explore its applications to (i) the determination of stellar atmospheric parameters (ii) study history populations. Methods. developed ULySS, a fit spectroscopic observations against linear combination non-linear model components convolved with parametric line-of-sight velocity distribution. The minimization can be either local or global, determines all in single fit. use chi2 maps, convergence maps Monte-Carlo simulations...
The nearly circular (mean eccentricity <e>~0.06) and coplanar mutual inclination <i>~3 deg) orbits of the Solar System planets motivated Kant Laplace to put forth hypothesis that are formed in disks, which has developed into widely accepted theory planet formation. Surprisingly, first several hundred extrasolar (mostly Jovian) discovered using Radial Velocity (RV) technique commonly on eccentric (<e> ~ 0.3). This raises a fundamental question: Are its formation special? Kepler mission found...
We compile and analyze ~200 trigonometric parallaxes proper motions of molecular masers associated with very young high-mass stars. These measurements strongly suggest that the Milky Way is a four-arm spiral. Fitting log-periodic spirals to locations masers, allows us significantly expand our view structure Way. present an updated model for its spiral incorporate it into previously published parallax-based distance-estimation program sources arms. Modeling three-dimensional space yields...
Context: Empirical libraries of stellar spectra play an important role in different fields. For example, they are used as reference for the automatic determination atmospheric parameters, or building synthetic populations to study galaxies. The CFLIB (Coude-feed library, Indo-US) database is at present one most complete libraries, terms its coverage parameters space (Teff, log g and [Fe/H]) wavelength 3460 - 9464 A a resolution 1 FWHM. Although stars were determined from detailed analyses...
The nearly continuous light curves with micromagnitude precision provided by the space mission Kepler are revolutionising our view of pulsating stars. They have revealed a vast sea low-amplitude pulsation modes that were undetectable from Earth. long time base allows an accurate determination frequencies and amplitudes needed for in-depth asteroseismic modeling. However, study to be successful, first estimates stellar parameters need known they can not derived photometry itself. Input...
Abstract Astrometric Very Long Baseline Interferometry (VLBI) observations of maser sources in the Milky Way are used to map spiral structure our galaxy and determine fundamental parameters such as rotation velocity (Θ 0 ) curve distance Galactic center ( R ). Here, we present an update on first results, implementing a recent change knowledge about Solar motion. It seems unavoidable that IAU recommended values for Θ need substantial revision. In particular combination 8.5 kpc 220 km s –1 can...
The LAMOST-Kepler survey, whose spectra are analyzed in the present paper, is first large spectroscopic project aimed at characterizing these sources. Our work focused selecting emission-line objects and chromospherically active stars on evaluation of atmospheric parameters. We have used a version code ROTFIT that exploits wide homogeneous collection real star spectra, i.e. Indo US library. provide catalog with parameters (Teff, logg, [Fe/H]), radial velocity (RV) an estimate projected...
We use about 200,000 FGK-type main-sequence stars from the LAMOST DR1 data to map local stellar kinematics. With velocity deprojection technique, we are able derive averaged three-dimensional and ellipsoids using only line-of-sight for with various effective temperatures within pc. Using mean velocities of cool stars, solar motion (, , ) = (9.58 ± 2.39, 10.52 1.96, 7.01 1.67) respect standard rest. Moreover, find that K show a net asymmetric ∼3 in compared K. And their azimuthal increases...
Dissolved organic matter (DOM) constitutes the most active fraction in global carbon pools, with estuarine sediments serving as significant repositories, where DOM is susceptible to dynamic transformations. Anthropogenic nitrogen (N) and sulfur (S) inputs further complicate by creating N-bearing (DON) S-bearing (DOS). This study delves into spatial gradients transformation mechanisms of DOM, DON, DOS Pearl River Estuary (PRE) sediments, China, using combined techniques UV-visible...
A number of spectroscopic surveys have been carried out or are planned to study the origin Milky Way. Their exploitation requires reliable automated methods and softwares measure fundamental parameters stars. Adopting ULySS package, we tested effect different resolutions signal-to-noise ratios (SNR) on measurement stellar atmospheric (effective temperature Teff, surface gravity log g, metallicity [Fe/H]). We show that is for determining these with medium-resolution spectra (R ∼ 2000). Then,...
We present a support vector machine classifier to identify the K giant stars from LAMOST survey directly using their spectral line features. The completeness of identification is about 75% for tests based on stellar parameters. contamination in identified sample lower than 2.5%. Applying classification method two million spectra observed during pilot and first year survey, we select 298,036 candidates. metallicities are also estimated with an uncertainty 0.13 ∼ 0.29 dex equivalent widths Mgb...
Asteroseismology is one of the most accurate approaches to estimate surface gravity a star. However, data from current spectroscopic surveys do not have asteroseismic measurements, which very expensive and time consuming. In order improve estimates for large amount survey with help small subset seismic we set up support vector regression (SVR) model estimation supervised by 1374 Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) giant stars Kepler gravity. The new approach...
ABSTRACT The LAMOST - Kepler project was designed to obtain high-quality, low-resolution spectra of many the stars in field with Large Sky Area Multi Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic telescope. To date 101,086 80,447 objects over entire have been acquired. Physical parameters, radial velocities, and rotational velocities these will be reported other papers. In this paper we present MK spectral classifications for determined automatic classification code MKCLASS. We...
All of the 14 subfields Kepler field have been observed at least once with Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, Xinglong Observatory, China) during 2012-2014 observation seasons. There are 88,628 reduced spectra SNR$_g$ (signal-to-noise ratio in g band) $\geq$ 6 after first round (2012-2014) observations for LAMOST-Kepler project (LK-project). By adopting upgraded version LAMOST Stellar Parameter pipeline (LASP), we determined atmospheric parameters ($T_{\rm...
Measurement of the local dark matter density plays an important role in both Galactic dynamics and direct detection experiments. However, estimated values from previous works are far agreeing with each other. In this work, we provide a well-defined observed sample 1427 G- K-type main-sequence stars Large Sky Area Multi-Object Fibre Spectroscopic Telescope spectroscopic survey, taking into account selection effects, volume completeness, stellar populations. We apply vertical Jeans equation...
Abstract The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) project performed its five year formal survey since Sep. 2012, already fulfilled the pilot and 1 st two years general with an output - spectroscopic data archive containing more than 4.1 million observations. One of scientific objectives is for better understanding structure evolution Milky Way. Thus, credible derivation physical properties stars plays a key role exploration. We developed implemented LAMOST...
Two contact binaries, GQ Boo and V1367 Tau, were observed analysed with a new method to obtain the absolute parameters. The light-curve analysis shows that both of them are obvious W-subtype much more massive but apparently cooler components (M2/M1 ≃ 2 4, T2/T1 0.95 0.94). orbital periods studied using O–C diagrams, it is thought minima timings heavily affected by longstanding magnetic activities on star surface, so cannot represent real period changes. mass–radius relationships proposed...
This is the second installment for Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Quasar Survey, which includes quasars observed from September 2013 to June 2015. There are 9024 confirmed in DR2 and 10911 DR3. After cross-match with SDSS quasar catalogs NED, 12126 discovered independently. Among them 2225 were released by DR12 QSO catalogue 2014 after we finalised survey candidates. 1801 sources identified DR14 as QSOs. The remaining 8100 considered newly founded, among...
Abstract Magnetoresistance-superconducting composite magnetic sensors, as highly sensitive weak have broad application prospects in fields such magnetocardiography, magnetoencephalography, and high-precision non-destructive testing. Among these, the field gain of superconducting flux concentrator is a key factor affecting resolution magnetoresistance-superconducting sensors. However, current concentrators face issue saturation amplification performance. This paper proposes novel structure...