A5044443480- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Atmospheric aerosols and clouds
- SAS software applications and methods
- Optical Systems and Laser Technology
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Infrared Target Detection Methodologies
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Mosquito-borne diseases and control
- Advanced Measurement and Detection Methods
- Impact of Light on Environment and Health
- Diet, Metabolism, and Disease
- Astrophysics and Cosmic Phenomena
- Ionosphere and magnetosphere dynamics
- Viral Infections and Outbreaks Research
- Remote Sensing in Agriculture
- Dengue and Mosquito Control Research
- Video Surveillance and Tracking Methods
Chinese Academy of Sciences
2018-2024
Xinjiang Astronomical Observatory
2013-2024
Purple Mountain Observatory
2024
National Astronomical Observatories
2013-2023
University of Chinese Academy of Sciences
2018
Jingning County People's Hospital
2016
In recent decades, the impact of dengue has increased both geographically and in intensity, this disease is now a threat to approximately half world's population. An unexpected large outbreak fever was reported Xishuangbanna Dai Autonomous Prefecture, Yunnan Province, China, 2013. This first autochthonous with significant proportion severe cases mainland China decade. According 2009 World Health Organization guidelines, 136 laboratory confirmed during epidemic were dengue. The clinical...
Abstract The Stellar Abundances and Galactic Evolution Survey (SAGES) of the northern sky is a specifically designed multiband photometric survey aiming to provide reliable stellar parameters with accuracy comparable those from low-resolution optical spectra. It was carried out 2.3 m Bok telescope Steward Observatory three other telescopes. observations in u s v passband produced over 36,092 frames images total, covering area ∼9960 deg 2 . median completenesses all observing fields for two...
This paper presents the photometric and spectroscopic analysis of a long-period totally eclipsing contact binary (HAT 307-0007476) for first time. system is low mass ratio ($q\sim0.114$) medium ($f\sim37.1\%$). Two flare events were detected in multiple bands observations December 2022. The interval between two 4 days. average duration these flares about 2289s. Both achieve energy levels superflares. excess emission H$_\alpha$ line LAMOST spectra this object was analyzed, indicating its...
Abstract This paper presents a highly lightweight model for astronomical image quality assessment, named AQSA-Net, designed to address the challenges of evaluating in scenarios with limited computational resources and rapid decision-making needs. With only 0.15B cost 0.67M parameters, AQSA-Net significantly reduces memory usage while enhancing inference speed real-time processing. We construct data set eight categories based on actual images. develop an efficient feature extraction...
ABSTRACT Optically observing and monitoring moving objects, both natural artificial, is important to human space security. Non-sidereal tracking can improve the system’s limiting magnitude for which benefits surveillance. However, images with non-sidereal include complex background, as well objects different brightness mode, posing a significant challenge accurate multi-object detection in such images, especially wide field-of-view telescope images. To achieve higher precision speed, we...
Abstract Based on previous site testing and satellite cloud data, Ali, Daocheng Muztagh-ata have been selected as candidate sites for the Large Optical/Infrared Telescope (LOT) in China. We present data collection, processing, management quality analysis our based using similar hardware. analyze meteorological seeing, background light, precipitable water vapor from 2017 March 10 to 2019 10. also investigated relative usefulness of all-sky camera comparison that TERRA a night-by-night...
Abstract A total of 1067 serum samples were collected from febrile patients in Xishuangbanna, Yunnan, 2015. Of these, 852 cases confirmed to be dengue NS1-positive. 76 structural protein genes sequenced through RT-PCR based on the viral RNAs extracted samples. Phylogenetic analysis revealed that all strains classified as cosmopolitan genotype DENV-2. After comparing with DENV-2SS, 173 base substitutions found sequences, resulting 43 nonsynonymous mutations, which 22 mutations existed among...
In this article, we present a detailed analysis of the statistical properties seeing for Muztagh-ata site which is candidate hosting future Chinese Large Optical/infrared Telescope (LOT) project. The measurement was obtained with Differential Image Motion Monitor (DIMM) from April 2017 to November 2018 at different heights during periods. median 11 meters and 6 are very close but significantly that on ground. We mainly analyzed monthly hourly, having found best season observing late autumn...
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...
The Large Optical/infrared Telescope (LOT) is a ground-based 12m diameter optical/infrared telescope which proposed to be built in the western part of China next decade. Based on satellite remote sensing data, along with geographical, logistical and political considerations, three candidate sites were chosen for astronomical performance monitoring. These include: Ali Tibet, Daocheng Sichuan, Muztagh Ata Xinjiang. Up until now, all have continuously collected data two years. In this paper, we...
Abstract A large ground-based optical/infrared telescope is being planned for a world-class astronomical site in China. The cloud-free night percentage the primary meteorological consideration evaluating candidate sites. data from GMS and NOAA satellites MODIS instrument were utilized this research, covering period 1996 to 2015. Our analysis benefits overlapping results different independent teams as well uniform of selected sites using GMS+NOAA data. Although significant monitoring needed...
The Nanshan One-meter Wide-field Telescope (NOWT) is a prime focus system located at Station of Xinjiang Astronomical Observatories (XAO). field view(FOV) was designed to 1.5 degree *1.5 degree, and Johnson-Cousins UBVRI chosen as the main Filter set. telescope has been providing observation services for astronomers since Sept. 2013. Variable source searching time-domain surveys are scientific goals. system's test results reported including linearity, dark current, bias, readout noise gain...
Abstract The Muztagh-Ata site, an excellent high-altitude ground-based astronomical observing site was discovered and monitored in the eastern part of Pamir Plateau southwestern Xinjiang Uygur Autonomous Region China. This has been systematically using various observational parameters since spring 2017. Yet, lacks long-term monitoring statistical characterization key variables such as: precipitable water vapour (PWV) air temperature. These factors directly influence whether a is suitable for...
The clarity of nights is the major factor that should be carefully considered for optical/infrared astronomical observatories in site-testing campaigns. Cloud coverage directly related to amount time available scientific observations at observatories. In this article, we report on results detailed night-time cloud statistics and continuous observing me derived from ground-based all-sky cameras Muztagh-ata site 2017 2021. Results obtained acquisition data show proportion annual 65%, best...
The 85-cm telescope at Xinglong station is a prime focus system that operates well with high science outputs. has been upgraded since 2014 new corrector, and filters camera, which are provided by Beijing Normal University. filter set the Johnson-Cousins UBVRI system. We report test results of including bias, dark current, linearity, gain readout noise CCD camera. Then we derive accurate instrumental calibration coefficients in bands Landolt standard stars during photometric nights. Finally,...
Abstract In this article, we present detailed seasonal, monthly and daily statistics of temperature difference in the surface layer at Muztagh-ata site based on measurements two heights 2m 6m. We find that inversion occurs frequently our during nighttime, especially cold season. Strong always represents stable atmospheric turbulence, which is crucial for an optical observatory. By analyzing behavior its correlation with wind cloud amount, one conclusion can be made radiation main reason...
Abstract Site-testing is crucial for achieving the goal of scientific research and analysis meteorological optical observing conditions, one associated basic tasks. As three potential sites to host 12-meter Large Optical/infrared Telescope (LOT), Muztagh-ata site, which located on Pamir Plateau in Xinjiang, west China, began its site-testing task spring 2017. In this paper, we firstly start with an introduction site then present a statistical ground-level properties such as air temperature,...
We present the revised and high quality CCD time series observations in 2017 2018 of W UMa-type contact binary BH~Cas. The combination our new determinations minimum times those collected from literatures reveal a long-term period increase with rate $\textit{dP/dt}\,=\,+3.27 \times 10^{-7} \textrm{d}\,\textrm{yr}^{-1}$, which can be accounted for by angular momentum transfer as less-massive component loses its mass to more massive one. One cyclical oscillation ($A'=0.00300$~days...
In this paper, we conducted a detailed analysis of optical turbulence in the Atmospheric Surface Layer (ASL) at Muztagh-ata site during on-site testing. We utilized ultrasonic anemometers positioned on 30-meter tower to collect and process data five height levels, obtaining from October 1, 2021 present. investigated behavior parameters (\(C_n^2\) seeing \(\varepsilon\)) ASL. Nighttime \(C_n^2\) primarily fluctuated range \(10^{-16}\) \(10^{-14}\), exhibiting an exponential decrease with...
Abstract First detected on 2023 November 4 by the Gravitational-wave Optical Transient Observer, SN 2023wrk is a Type Ia Supernova at 40 Mpc, with significant unburned carbon in outer ejecta. In this note, we present photometric and spectroscopic observations analysis conducted Global Rapid Advanced Network Devoted to Multi-messenger Addict over 115 days period, which includes 78 of measurements. The were contributed both amateur professional astronomers. J. Liu et al. analyzed physical...
The atmosphere of Triton was probed directly by observing a ground-based stellar occultation on 6 October 2022. This rare event yielded 23 positive light curves collected from 13 separate observation stations contributing to our campaign. significance this lies in its potential validate the modest pressure fluctuation Triton, phenomenon not definitively verified previous observations, including only five occultations, and Voyager 2 radio 1989. Using an approach consistent with comparable...
Abstract We present extensive photometric and spectroscopic observations of the nearby Type Ia supernova (SN) 2023wrk at a distance about 40 Mpc. The earliest detection this SN can be traced back to few hours after explosion. Within first days, light curve shows bump feature, while B − V color is blue remains nearly constant. overall spectral evolution similar that an 1991T/SN 1999aa-like Ia, C ii λ 6580 absorption line appears unusually strong in spectrum taken t ≈ −15.4 days maximum light....
Optically observing and monitoring moving objects, both natural artificial, is important to human space security. Non-sidereal tracking can improve the system's limiting magnitude for which benefits surveillance. However, images with non-sidereal include complex background, as well objects different brightness mode, posing a significant challenge accurate multi-object detection in such images, especially wide field of view (WFOV) telescope images. To achieve higher precision speed, we...