A5014450654- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- GNSS positioning and interference
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
- Antenna Design and Optimization
- Particle Detector Development and Performance
- Adaptive optics and wavefront sensing
- Anomaly Detection Techniques and Applications
- Image Processing and 3D Reconstruction
- Superconducting and THz Device Technology
- Spectroscopy and Laser Applications
- Geophysics and Sensor Technology
- Seismic Imaging and Inversion Techniques
- Astronomical Observations and Instrumentation
- Seismology and Earthquake Studies
- Galaxies: Formation, Evolution, Phenomena
Inner Mongolia University of Technology
2025
Chinese Academy of Sciences
2015-2024
Guizhou University
2022-2024
National Astronomical Observatories
2015-2024
University of Chinese Academy of Sciences
2016-2024
Chongqing University
2024
Chinese Academy of Meteorological Sciences
2022
Harbin Institute of Technology
2019
Foundation for the Advancement of Social Theory
2019
West Park Hospital
2009
Having achieved 'first-light' right before the opening ceremony on September 25, 2016, Five-hundred-meter Aperture Spherical radio Telescope (FAST) is being busily commissioned. Its innovative design requires ~1000 points to be measured and driven instead of just two axes motion, e.g. Azimuth Elevation for most conventional antennae, realize pointing tracking. We have devised a survey plan utilized full sensitivity FAST, while minimizing complexities in operation system. The 19-beam L band...
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a Chinese mega-science project funded by the National Development and Reform Commission (NDRC) of People's Republic China. Astronomical Observatories China (NAOC) in charge its construction subsequent operation. Upon expected completion September 2016, FAST will surpass 300-meter Arecibo 100-meter Green Bank terms absolute sensitivity 70 MHz to 3 GHz bands. In this paper, we report on project, current status, key science...
We present the discovery of 24 pulsars in 15 Globular Clusters (GCs) using Five-hundred-meter Aperture Spherical radio Telescope (FAST). These include first pulsar discoveries M2, M10, and M14. Most new systems are either confirmed or likely members binary systems. M53C, NGC6517H I only three to be isolated. M14A is a black widow with an orbital period 5.5 hours minimum companion mass 0.016 \Ms. M14E eclipsing 20.3 hours. With other 8 that have been reported elsewhere, total 32 GC discovered...
Abstract Spider pulsars are neutron stars that have a companion star in close orbit. The sheds material to the star, spinning it up millisecond rotation periods, while orbit shortens hours. is eventually ablated and destroyed by pulsar wind radiation 1,2 . key for studying evolutionary link between accreting X-ray isolated pulsars, irradiation effects birth of massive 3–6 Black widow extremely compact orbits (as short as 62 minutes 7 ) companions with masses much smaller than 0.1 M ⊙ They...
Abstract We present the discovery of eight isolated millisecond pulsars in globular cluster (GC) NGC 6517 using Five-hundred-meter Aperture Spherical radio Telescope (FAST). The spin periods those (namely PSR J1801–0857K to R, or 6517K R) are all shorter than 10 ms. With these discoveries, is currently GC with most known FAST sky. largest difference dispersion measure 11.2 cm −3 pc, second among GCs. fraction this (16 17, 94%) consistent previous studies indicating an overabundance densest...
Abstract Rotating radio transients (RRATs) are neutron stars that emit sporadic bursts. We detected 1955 single pulses from RRAT J1913+1330 using the 19 beam receiver of Five-hundred-meter Aperture Spherical Telescope. These were in distinct clusters, with 49.4% them occurring a waiting time one rotation period. The energy distribution these individual exhibited wide range, spanning 3 orders magnitude, reminiscent repeating fast bursts (FRBs). Furthermore, we observed abrupt variations pulse...
Pulsar polarization profiles are critical for understanding their magnetospheric structures and radiation mechanisms. We present profile measurements 25 pulsars in globular clusters (GCs) from the observation of Five-hundred-meter Aperture Spherical radio Telescope (FAST). The diversity shows complex magnetic structure emission pattern pulsars. Among these, 15 were firstly measured. M53A a 57\% linear ratio, being highest among these GC M15H 42\% circular which is average ratios absolute...
PSR B1310+18A is a 33-ms binary pulsar in 256-day, low eccentricity orbit with low-mass companion located NGC 5024 (M53). In this Letter, we present the first phase-coherent timing solution for (designated as M53A) derived from 35-year baseline; combines archival Arecibo Observatory data recent observations Five-hundred-meter Aperture Spherical radio Telescope (FAST). We find that spin period derivative of between 6.1 and $7.5 \times 10^{-19} \rm \, s\, s^{-1}$, which implies characteristic...
Abstract The C 2 H N=1-0 transition was used to investigate the possible line of sight sub-structures 
from dense and optically thick in 13 CO J=1-0 regions Ophiuchus star forming molecular cloud.
Compared with previous studies, 
even when mapping area extended whole region emission,
L1709 is only new detected N=1-0.
With a 0.2 K or lower noise, multi-peak spectra were obtained then for identifying sub-structures.
There are clues, e.g., core...
With the widespread application of new quality productivity in production and service processes, whether manufacturing enterprises can seize opportunities avoid risks increasingly fierce market competition technological changes plays a crucial role development enterprises. Based on this, this paper constructs model using Analytic Hierarchy Process (AHP) to comprehensively evaluate different technologies based their scores these aspects. Additionally, Operations Research methods are used...
Abstract We describe PSR J1926−0652, a pulsar recently discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Using sensitive single-pulse detections from FAST and long-term timing observations Parkes 64 m telescope, we probed phenomena on both long short timescales. The covered wide frequency range 270 to 800 MHz, enabling individual pulses be studied in detail. exhibits at least four profile components, short-term nulling lasting 4 450 pulses, complex subpulse...
We present timing solutions and analyses of 11 pulsars discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). These were using an ultra-wide bandwidth receiver in drift-scan observations made during commissioning phase FAST, then confirmed timed 64-m Parkes Radio Telescope. Each pulsar has been observed over a span at least one year. Highlighted discoveries include PSR J0344-0901, which displays mode-changing behaviour may belong to class so-called `swooshing'...
We report the follow-up of 10 pulsars discovered by Five-hundred-meter Aperture Spherical radio-Telescope (FAST) during its commissioning. The were at a frequency 500-MHz using ultra-wide-band (UWB) receiver in drift-scan mode, as part Commensal Radio Astronomy FAST Survey (CRAFTS). carried out timing campaign with 100-m Effelsberg radio-telescope L-band around 1.36 GHz. Along 11 previously reported, seems to be uncovering population older pulsars, bordering and/or even across pulsar...
ABSTRACT Discovering pulsars is a significant and meaningful research topic in the field of radio astronomy. With advent astronomical instruments, volume rate data acquisition have grown exponentially. This development necessitates focus on artificial intelligence (AI) technologies that can mine large sets. Automatic pulsar candidate identification (APCI) be considered as task determining potential candidates for further investigation eliminating noise radio-frequency interference other...
Abstract As the performance of dedicated facilities has continually improved, large numbers pulsar candidates are being received, which makes selecting valuable signals from challenging. In this paper, we describe design for a deep convolutional neural network (CNN) with 11 layers classifying candidates. Compared to artificially designed features, CNN chooses subintegrations plot and sub-bands each candidate as inputs without carrying biases. To address imbalance problem, data augmentation...
We report the discovery of an eclipsing binary millisecond pulsar in globular cluster M92 (NGC6341) with Five-hundred-meter Aperture Spherical radio Telescope (FAST). PSR J1717+4308A, or M92A, has a pulse frequency 316.5~Hz (3.16~ms) and dispersion measure 35.45 pc cm$^{-3}$. The is member system orbital period 0.20~days around low-mass companion which median mass $\sim$0.18~\Ms. From observations so far, at least two events have been observed each orbit. longer one lasted for ~5000~s phase...
Neither HI nor CO emission can reveal a significant quantity of so-called dark gas in the interstellar medium (ISM). It is considered that CO-dark molecular (DMG), with no or weak emission, dominates gas. We identified 36 DMG clouds C$^+$ (data from Galactic Observations Terahertz C+ (GOT C+) project) and HINSA features. Based on uncertainty analysis, optical depth $\tau\rm_{HI}$ 1 reasonable value for most clouds. With assumption $\tau\rm_{HI}=1$, these were characterized by excitation...
ABSTRACT We report the phase-connected timing ephemeris, polarization pulse profiles, Faraday rotation measurements, and Rotating-Vector-Model (RVM) fitting results of 12 millisecond pulsars (MSPs) discovered with Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST survey (CRAFTS). The campaigns were carried out Arecibo over 3 yr. 11 are neutron star–white dwarf binary systems, orbital periods between 2.4 100 d. 10 them have spin periods, companion...