A5080228341- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Catalytic C–H Functionalization Methods
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Sulfur-Based Synthesis Techniques
- Synthesis and Biological Evaluation
- Chemical Synthesis and Reactions
- Cyclopropane Reaction Mechanisms
- Phenothiazines and Benzothiazines Synthesis and Activities
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Synthesis and Catalytic Reactions
- Astronomical Observations and Instrumentation
- Oxidative Organic Chemistry Reactions
- Asymmetric Hydrogenation and Catalysis
- Synthesis and biological activity
- Spectroscopy and Laser Applications
- Organic and Inorganic Chemical Reactions
- Catalytic Cross-Coupling Reactions
- Quinazolinone synthesis and applications
- Scientific Research and Discoveries
- Catalytic Alkyne Reactions
- Solar and Space Plasma Dynamics
Sichuan University
2011-2025
Beijing Normal University
2020-2024
Anyang Hospital of Traditional Chinese Medicine
2022
Chengdu University
2015
A novel and simple transition metal-free direct arylation of arene N-heteroarenes with diaryliodonium salts has been developed. This cross-coupling reaction is promoted only by base gives the desired products in moderate to good yields.
Abstract By combining spectra from the CALSPEC and NGSL, as well spectroscopic data LAMOST Data Release 7 (DR7), we have analyzed corrected systematic errors of Gaia DR3 BP/RP (XP) spectra. The depend on normalized spectral energy distribution (simplified by two independent “colors”) G magnitude. Our corrections are applicable in range approximately −0.5 < BP − RP 2, 3 17.5, E ( B V ) 0.8. To validate our correction, conduct tests comparisons with MILES LEMONY results demonstrate that...
We have obtained accurate dust reddening from far-ultraviolet (UV) to the mid-infrared (IR) for up 5 million stars by star-pair algorithm based on LAMOST stellar parameters along with GALEX, Pan-STARRS 1, Gaia, SDSS, 2MASS, and WISE photometric data. The typical errors are between 0.01-0.03 mag most colors. derived empirical coefficients 21 colors both in traditional (single valued) way as a function of Teff E(B-V) using largest samples measurements, together extinction values Schlegel et...
Abstract The total-to-selective extinction ratio, R V , is a key parameter for tracing the properties of interstellar dust, as it directly determines variation curve with wavelength. By utilizing accurate color excess measurements from optical to mid-infrared range, we have derived values approximately three million stars LAMOST data release 7 using forward-modeling technique. This extensive set enables us construct comprehensive 2D map Milky Way within footprint at spatial resolution...
Abstract We combine photometric data from GALEX GR6+7 All-Sky Imaging Survey and Gaia Early Data Release 3 with stellar parameters the SAGA PASTEL catalogs to construct high-quality training samples for dwarfs (0.4 < BP − RP 1.6) giants (0.6 1.6). apply careful reddening corrections using empirical temperature- extinction-dependent extinction coefficients. Using two samples, we establish a relationship between loci (near-ultraviolet (NUV)−BP versus colors), metallicity, M G . For given...
An efficient, concise, and transition metal-free synthesis of functionalized sulfonylated five-membered heterocyclic compounds via an SNAr reaction has been developed. Using commercially available sodium sulfinates as sulfonylation reagents, various sulfones were obtained in good yields.
A copper-catalyzed reaction providing direct access to 2-arylpyridines from acetophenones and 1,3-diaminopropane is described. range of electronically diverse undergo this transformation, affording in good yields.
A metal-free direct alkylation of C–H bonds adjacent to an oxygen or nitrogen atom was developed. This reaction occurred between saturated heterocycles and ethynylbenziodoxolones under mild conditions. series 2-alkynyl cyclic alkanes that contain atoms were prepared in moderate good yields.
With the global increase in disaster risks, enhancing urban resilience has become a critical strategy for risk mitigation and sustainable development. This study develops two-dimensional indicator framework based on systems capacity from perspective of management cycle applies an improved CRITIC-TOPSIS method to evaluate levels Chengdu–Chongqing agglomeration, China. The spatiotemporal evolution 2010 2022 is systematically examined. Furthermore, dynamics transitions are investigated using...
An efficient method to synthesize substituted quinolines from ketones and 2-amino benzylamines is described.
In this letter, we have carried out an independent validation of the Gaia EDR3 photometry using about 10,000 Landolt standard stars from Clem & (2013). Using a machine learning technique, UBVRI magnitudes are converted into and colors then compared to those in EDR3, with effect metallicity incorporated. Our result confirms significant improvements calibration process EDR3. Yet modest trends up 10 mmag G magnitude found for all < 19 mag range, particularly bright faint ends. With aid...
Abstract In this work, we perform the recalibration of Pan-STARRS1 (PS1) photometry by correcting for position-dependent systematic errors using spectroscopy-based stellar color regression (SCR) method, photometry-based SCR and Gaia BP/RP synthetic method. We confirm significant large-scale small-scale spatial variation magnitude offsets all grizy filters. show that PS1 photometric calibration precisions in filters are around 5–7 mmag when averaged over 14′ regions. note a much larger error...
Abstract A practical transition‐metal‐free procedure for the synthesis of ( E )‐vinyl sulfones through coupling vinyl halides with sodium sulfinates in water is reported. The reaction strongly influenced by presence acids, and use n Bu 4 NBr promotes its efficiency.
The first metal-free alkynylation/ring expansion cascade process of alkenyl cyclobutanols with ethynylbenziodoxolones has been developed. A variety synthetically valuable β-alkynylated cyclopentanones were prepared in moderate to good yields. Alkynyl could also undergo this transformation, providing a new approach substituted ene-yne-carbonyl compounds.
M31 and M33 serve as ideal places to study distributions of dust in the outskirts spiral galaxies. In this letter, using about 0.2 million stars selected from LAMOST data combining precise photometry parallaxes Gaia DR2, we have constructed a two-dimensional foreground reddening map towards region ($111.2{\deg} {\le} gl 136.2{\deg}, -36.5{\deg} gb -16.5{\deg}$). The has typical spatial resolution 12 arc-minute precision 0.01 mag. complex structure clouds is revealed. By carefully removing...
In this paper, a total of approximately 2.6 million dwarfs were constructed as standard stars, with an accuracy about 0.01-0.02 mag for each band, by combining spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope Data Release 7, photometric corrected Gaia Early 3, and metallicities. Using spectroscopy based stellar color regression method (SCR method) photometric-based SCR (SCR' method), we performed relative calibration Nanshan One-meter Wide-field imaging...
Abstract The upcoming Chinese Space Station Telescope (CSST) slitless spectroscopic survey poses a challenge of flux calibration, which requires large number flux-standard stars. In this work, we design an uncertainty-aware residual attention network, the UaRA-net, to derive CSST spectral energy distributions (SEDs) with resolution R = 200 over wavelength range 2500–10000 Å using LAMOST normalized spectra 2000 4000–7000 Å. With special structure and training strategy, proposed model provides...
Abstract We present a direct measurement of extinction curves using corrected Gaia XP spectra the common sources in DR3 and LAMOST DR7. Our analysis approximately 370,000 high-quality samples yielded high-precision average curve for Milky Way. After incorporating infrared photometric data from Two Micron All Sky Survey Wide-field Infrared Explorer, spans wavelengths 0.336 to 4.6 μ m. determine an R 55 2.730 ± 0.007, corresponding V = 3.073 0.009, near-infrared power-law index α 1.935 0.037....
Abstract In the fourth paper of this series, we present metallicity-dependent Sloan Digital Sky Survey (SDSS) stellar color loci red giant stars, using a spectroscopic sample giants in SDSS Stripe 82 region. The stars span range 0.55 – 1.2 mag g i , –0.3 –2.5 metallicity [Fe/H], and have values surface gravity log smaller than 3.5 dex. As case main-sequence (MS) intrinsic widths are also found to be quite narrow, few mmag at maximum. There however systematic differences between MS stars....
We employ Gaia, 2MASS, and ALLWISE photometry, as well astrometric data from to search for relatively bright very metal-poor ([Fe/H] $< -2.0$; VMP) giant star candidates using three different criteria: 1) our derived Gaia photometric metallicities, 2) the lack of stellar molecular absorption near 4.6 microns, 3) their high tangential velocities. With combinations these criteria, we have identified six samples with $G <$ 15: Gold sample (24,304 candidates), Silver GW (40,157 GK (120,452...
An iodine-mediated synthesis of 3-acylbenzothiadizine 1,1-dioxides is described. A range electronically diverse acetophenones reacted well with several 2-aminobenzenesulfonamides, affording 3-acylbenzothiadiazine in good yields.
By combining spectra from the CALSPEC and NGSL, as well spectroscopic data LAMOST Data Release 7 (DR7), we have analyzed corrected systematic errors of Gaia DR3 BP/RP (XP) spectra. The depend on normalized spectral energy distribution (simplified by two independent ``colors'') $G$ magnitude. Our corrections are applicable in range approximately $-0.5<BP-RP<2$, $3<G<17.5$ $E(B-V)<0.8$. To validate our correction, conduct tests comparing with MILES LEMONY results demonstrate that $BP-RP$ been...