A5013278548- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Antenna Design and Optimization
- GNSS positioning and interference
- Superconducting and THz Device Technology
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Space Science and Extraterrestrial Life
- Planetary Science and Exploration
- Geophysics and Sensor Technology
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- BIM and Construction Integration
- Seismology and Earthquake Studies
- Particle Accelerators and Free-Electron Lasers
- earthquake and tectonic studies
- Radiation Effects in Electronics
National Astronomical Observatories
2016-2025
Chinese Academy of Sciences
2016-2025
Xiangtan University
2025
Wuhan Municipal Engineering Design & Research Institute
2024
University of Chinese Academy of Sciences
2020-2024
Foundation for the Advancement of Social Theory
2019
Nanjing Institute of Astronomical Optics & Technology
2017
Institute of Radio Astronomy
2016
Peking University
2006-2008
Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a Chinese mega-science project to build the largest single dish telescope in world. Its innovative engineering concept and design pave new road realize huge most effective way. FAST also represents contribution international efforts square kilometer array (SKA). Being sensitive telescope, will enable astronomers jump-start many science goals, for example, surveying neutral hydrogen Milky Way other galaxies, detecting faint...
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...
Abstract The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has passed national acceptance and finished one pilot cycle of ‘Shared-Risk’ observations. It will start formal operation soon. In this context, paper describes testing results key fundamental parameters for FAST, aiming to provide basic support observation data reduction FAST scientific researchers. 19-beam receiver covering 1.05–1.45 GHz was utilized most these fluctuation in electronic gain the system is better than...
The dispersive sweep of fast radio bursts (FRBs) has been used to probe the ionized baryon content intergalactic medium, which is assumed dominate total extragalactic dispersion. While host galaxy contributions dispersion measure (DM) appear be small for most FRBs, in at least one case there evidence an extreme magneto-ionic local environment and a compact persistent source. Here we report detection localization repeating FRB 20190520B, co-located with compact, source associated dwarf high...
The polarization of fast radio bursts (FRBs), which are bright astronomical transient phenomena, contains information about their environments. Using wide-band observations with two telescopes, we report measurements five repeating FRBs and find a trend lower at frequencies. This behavior is modeled as multipath scattering, characterized by single parameter, σRM, the rotation measure (RM) scatter. Sources higher σRM have RM magnitude scattering time scales. sources highest FRB 20121102A...
The megajansky radio burst, FRB 20200428, and other bright bursts detected from the Galactic source SGR J1935+2154 suggest that magnetars can make fast (FRBs), but emission site mechanism of FRB-like are still unidentified. Here, we report emergence a pulsar phase magnetar 5 months after 20200428. Pulses were in 16.5 hours over 13 days using Five-hundred-meter Aperture Spherical Telescope, with luminosities about eight decades fainter than pulses emitted narrow window anti-aligned x-ray...
Machine learning, algorithms designed to extract empirical knowledge from data, can be used classify which is one of the most common tasks in observational astronomy. In this paper, we focus on Bayesian data classification using Gaussian mixture model and show two applications pulsar After reviewing related expectation–maximization algorithm, present a method Neyman–Pearson test. To demonstrate method, apply algorithm problems. First, it applied well-known period–period derivative diagram,...
Magnetic fields play an important role in the evolution of interstellar medium and star formation. As only direct probe field strength, credible Zeeman measurements remain sparse due to lack suitable probes, particularly for cold, molecular gas. Here we report detection a magnetic $+$3.8 $\pm$ 0.3 $\mu$G through HI narrow self-absorption (HINSA) toward L1544, well-studied prototypical prestellar core early transition between starless protostellar phases characterized by high central number...
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...
ABSTRACT We report on our discovery of the radio pulsar, PSR J2016+3711, in supernova remnant (SNR) CTB 87, with a ∼10.8σ significance pulses, which confirms compact nature X-ray point source 87. It is first pulsar discovered SNRs using Five-hundred-meter Aperture Spherical Telescope (FAST). Its integrated pulse profile can be well described by single component, width at 50 per cent peak flux density about 28.1○ and an effective 32.2○. The mean 1.25 GHz estimated to 15.5 $\mu$Jy. Combined...
Abstract We report the timing analysis of PSR J1846−0513, a pulsar discovered by Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST Survey. The possesses spin period 23.36 ms and spin-down rate ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>P</mml:mi> </mml:mrow> <mml:mo>̇</mml:mo> </mml:mover> </mml:math> ) 1.0106(3) × 10 −18 s −1 , it is located an eccentric orbit e...
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...
We present polarization pulse profiles for 56 millisecond pulsars (MSPs) monitored by the Chinese Pulsar Timing Array (CPTA) collaboration using Five-hundred-meter Aperture Spherical radio Telescope (FAST). The observations centered at 1.25 GHz with a raw bandwidth of 500 MHz. Due to high sensitivity (∼16 K/Jy) FAST telescope and our long integration time, signal-to-noise ratio show features hardly detected before. Among pulsars, PSRs J0406$+$3039, J1327$+$3423, J2022$+$2534 were not...
Carrier-assisted phase retrieval (CA-PR) schemes significantly reduce the hardware cost of receiver by using a dispersive element and two photodetectors (PDs) to reconstruct optical field signal. The application scenarios are restricted its limited signal reconstruction accuracy high computational complexity. In this paper, carrier-assisted scheme with adaptive weighted factors (CA-PR-AWF) is proposed. intensity information obtained iteratively known square law detection introducing factor,...
As an innovative inorganic cementitious material, geopolymer holds significant application potential in the field of road engineering. Based on theoretical basis industrial solid waste resource utilization and combined with geopolymerization technology, this study investigates feasibility applying lead–zinc-tailing-based geopolymer–stabilized aggregate (LZT-GSA) engineering through systematic mechanical property tests, durability assessment, microstructural characterization. The focuses...
Abstract The nature of irregularly spaced pulses rotating radio transients (RRATs) complicates interstellar scintillation studies. In this Letter, we report the primary parameters a sample RRATs using pairwise correlations pulse spectra. Moreover, from measured velocities, constrain their transverse velocities. We also find reduced modulation index, m = 0.13 ± 0.01, for RRAT J1538+2345. Several possible explanations are discussed. Furthermore, single-pulse-based technique is applicable to...