A5100360703- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Molecular Sensors and Ion Detection
- Solar and Space Plasma Dynamics
- Advanced biosensing and bioanalysis techniques
- Advanced Nanomaterials in Catalysis
- Black Holes and Theoretical Physics
- Solar Radiation and Photovoltaics
- High-pressure geophysics and materials
- Fluid Dynamics and Turbulent Flows
- Electrochemical sensors and biosensors
- Calibration and Measurement Techniques
- Optimization and Search Problems
- Consumer Market Behavior and Pricing
- Noncommutative and Quantum Gravity Theories
- ZnO doping and properties
- Analytical Chemistry and Sensors
Chinese Academy of Sciences
2013-2023
Yunnan Observatories
2013-2023
Beijing Research Institute of Uranium Geology
2023
Leiden University
2022
Weinan Normal University
2014-2020
University of Chinese Academy of Sciences
2011-2019
Kunming Institute of Zoology
2014-2016
National Astronomical Observatories
2009-2015
Institute of Computing Technology
2015
North China Electric Power University
2015
Numerous EWs were discovered by several deep photometric survey and there are about 40785 EW-type binary systems listed in the international variable star index (VSX) March 13, 2017. 7938 of them observed LAMOST November 30, 2016 their spectral types given. Stellar atmospheric parameters 5363 stars determined based on good spectroscopic observations. In paper, those catalogued properties analyzed. The distributions orbital period (P), effect temperature (T), gravitational acceleration...
About 3196 EA-type binaries (EAs) were observed by LAMOST 2017 June 16 and their spectral types derived. Meanwhile, the stellar atmospheric parameters of 2020 EAs determined. In this paper, those are cataloged physical properties evolutionary states investigated. The period distribution suggests that limit tidal locking for close is about 6 days. It found metallicity higher than EW-type (EWs), indicating generally younger EWs they progenitors EWs. metallicities long-period ( days) same as...
In this article, we report a colorimetric approach for the determination of hypochlorite (OCl−) with gold nanoparticles (Au NPs). The test proceeds as two individual steps and selectivity is developed based on strong oxidizing ability hypochlorite. concentrated phosphate buffer (PB), red solution citrate-capped Au NPs could be stabilized by chemisorption 11-mercaptoundecanoic acid (MUA), without which colloidal suspension turned blue because salt-induced particles aggregation. However, its...
Using the precise times of mid-egress eclipsing polar HU Aqr, we discovered that this is orbited by two or more giant planets. The planets detected so far have masses at least 5.9 and 4.5\,M_{Jup}. Their respective distances from are 3.6 AU 5.4 with periods 6.54 11.96 years, respectively. observed rate period decrease derived downward parabolic change in O-C curve a factor 15 larger than value expected for gravitational radiation. This indicates it may be only part long-period cyclic...
As an extension of our previous work, which described the unique ability core/shell Cu@Au nanoparticle (NP) to selectively recognize iodide,(1) herein, we wish report development alternatively sensitive and selective colorimetric detection for sulfide anion cysteine based upon NP by a competition avenue. In absence or cysteine, iodide can induce appreciable color change solution from purple red transforming clusters single, nearly spherical, larger ones. However, transformation is severely...
The cosmic curvature, a fundamental parameter for cosmology could hold deep clues to inflation and origins. We propose an improved model-independent method constrain the curvature by combining constructed Hubble diagram of high-redshift quasars with galactic-scale strong lensing systems expected be seen forthcoming LSST survey. More specifically, most recent quasar data are used as new type standard candles in range $0.036<z<5.100$, whose luminosity distances can directly derived from...
The orbital composition of the electrode wave functions and complex bands within barrier band gap are two important factors in deciding spin-filter effect. This is illustrated a class spinel oxides, including MgAl2O4, ZnAl2O4, SiMg2O4, SiZn2O4. Through first-principles calculations electron transmission along [001] direction, they shown to have same Δ1 effect as MgO due combination both factors. Due better lattice match with typical bcc magnetic electrodes than MgO, these materials provide...
The four-color ($B$ $V$ $R_c$ $I_c$) light curves of V776 Cas are presented and analyzed using the Wilson-Devinney (W-D) method. It is discovered that an early F-type (F2V) overcontact binary with a very high contact degree ($ f=64.6\,\%$) extremely low mass ratio ($q=0.130$), which indicate it at final evolutionary stage cool short-period binaries. primary secondary stars calculated to be $M_1 = 1.55(\pm0.04)M_\odot$, $M_2 0.20(\pm0.01)M_\odot$. supposed formed from initially detached...
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...
Abstract The parameter distribution of binaries is a fundamental knowledge the stellar systems. A statistical study on binary stars carried out based LAMOST spectral and Kepler photometric database. We presented catalog 1320 with plentiful parameters, including period, subtype, atmosphere parameters ( T eff , [Fe/H], <?CDATA $\mathrm{log}g$?> ), physical properties, such as mass, radius, age, for primary component stars. Based this catalog, unbiased distribution, rather than observed was...
Recognition and sensing of anions in aqueous media have been considerable interest while remaining a challenging task up to date. In this document, we wish present simple yet sensitive method detect inorganic by colorimetry based on the citrate-stabilized core/shell Cu@Ag nanoparticle (NP). It was found that NP could discriminate some specific (Cl(-), Br(-), I(-), S(2-), SCN(-)) from wide range environmentally dominant (F(-), SO(4)(2-), H(2)PO(4)(-), CO(3)(2-), NO(3)(-), etc), identified...
In this paper, we report on the discovery of an optical flare observed in R band from red-dwarf eclipsing binary CU Cancri, whose component stars are at upper boundary full convection (M1= 0.43 M⊙ and M2= 0.4 M⊙, where is solar mass). The amplitude largest among those detected (∼0.52 mag) duration time about 73 min. Like flares Sun, quasi-periodic oscillations were seen during after flare. Three more R-band found by follow-up monitoring. total, was monitored photometrically using filter for...
About 766 $\delta$ Scuti stars were observed by LAMOST June 16, 2017. Stellar atmospheric parameters of 525 variables determined, while spectral types obtained for all samples. In the paper, those spectroscopic data are catalogued. We detect a group 131 unusual and cool variable (UCVs) that distinguished from normal (NDSTs). On H-R diagram $\log g-T$ diagram, UCVs far beyond red edge pulsational instability trip. Their effective temperatures lower than 6700\,K with periods in range 0.09 to...
V606 Centauri (V606 Cen) is an early B-type close binary with orbital period of 1.4950935\,d and the complete light curves are very difficult to be observed on ground. By analyzing unbroken continuous curve obtained by TESS, we found that it a marginal contact low fill-out factor about 2\%. The O-C diagram Cen constructed for first time based 118.8-years eclipse times. It shows downward parabolic change together cyclic oscillation amplitude 0.0544\, d 88.8\, yr. variation reveals linear...
Abstract The phenomenon that a clock at higher gravitational potential ticks faster than one lower potential, also known as redshift, is of the classical tests Einstein’s theory general relativity. Owing to their ultra-high accuracy and stability, state-of-the-art optical lattice clocks have enabled resolving redshift with millimeter-scale height difference. Further reducing vertical inter-clock separation down sub-millimeter level especially shortening required measurement time may be...
By using 78 newly determined timings of light minima together with those collected from the literature, we analysed changes in observed minus calculated (O−C) diagram HS 0705+6700, a short-period (2.3 h) eclipsing binary that consists very hot subdwarf B-type (sdB) star and cool fully convective red dwarf. We confirmed cyclic variation O−C refined parameters circumbinary brown dwarf (reported to orbit system 2009) by analysing for travel time effect arises gravitational influence third body....
Extended time series of Solar Activity Indices (ESAI) extended the Greenwich sunspot area from year 1874 back to 1821. The ESAI's yearly in northern and southern hemispheres 1821 2013 is utilized investigate characteristics north–south hemispherical asymmetry activity. Periodical behavior about 12 solar cycles also confirmed ESAI data set exist dominant hemispheres, linear regression lines values, cumulative counts areas for cycles. period inferred appear both difference over entire interval...
In this paper, the generalized equation of state (GEoS) for dark energy ( $$w_\beta =w_0-w_{\beta }[(1+z)^{-\beta }-1]/\beta $$ ) is investigated with combined standard ruler data from observations intermediate-luminosity radio quasars, galaxy clusters, BAO and CMB. The constraint results show that best-fit EoS parameters are $$w_0=-\,0.94^{+0.57}_{-0.41}$$ , =-\,0.17^{+2.45}_{-4.81}$$ $$\beta =-1.42$$ (with a lower limit >-\,2.70$$ at 68.3% C.L.), which implies early times vanishes....
In this paper, we assemble a well-defined sample of early-type gravitational lenses extracted from large collection 158 systems, and use the redshift distribution galactic-scale to test standard cosmological model ( $$\varLambda $$ CDM) modified gravity theory (DGP). Two additional sub-samples are also included account for possible selection effect introduced by detectability lens galaxies. Our results show that independent measurement matter density parameter $$\varOmega _m$$ ) could be...
Context. The Sun is very quiet with less sunspots and activity since the beginning of solar cycle 24. However, active region (AR) 11 045 emerged on February 5, 2010, associated 43 (8 M- 35 C-class) flares, 53 coronal mass ejections (CMEs), 29 filament eruptions, 19 extreme ultraviolet (EUV) waves abundant jets, indicating that this AR first productive one
Abstract Noble gases in lunar soils provide critical information regarding solar wind and cosmic-ray interactions with the surface, as well history of impact events affecting regolith turnover processes. Here, we studied characteristics noble He, Ne, Ar Chang’E-5 soil. High 4 He/ 36 20 Ne/ values show that soil has typical mare terrain characteristics. Furthermore, both are higher than those other soils, suggesting secondary processes occurring may have been less strong samples. Trapped ( 3...