A5020149355- Pulsars and Gravitational Waves Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- GNSS positioning and interference
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Geophysics and Sensor Technology
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- Stellar, planetary, and galactic studies
- Cold Atom Physics and Bose-Einstein Condensates
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
National Astronomical Observatories
2018-2025
Chinese Academy of Sciences
2018-2025
Guizhou University
2022-2025
Institute of High Energy Physics
2015-2024
Henan University
2023
Inner Mongolia University
2023
University of Chinese Academy of Sciences
2023
Harbin Institute of Technology
2023
Suzhou Kowloon Hospital
2021
Peking University
2013-2019
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...
An enhancement near threshold is observed in the omega(phi) invariant mass spectrum from doubly Okubo-Zweig-Iizuka-suppressed decays of J/psi-->gamma(omega)phi, based on a sample 5.8 x 10(7) J/psi events collected with BESII detector. A partial wave analysis shows that this favors JP=0+, and its width are M=1812(+19)(-26)(stat)+/-18(syst) MeV/c2 Gamma=105+/-20(stat)+/-28(syst) MeV/c2. The product branching fraction determined to be...
Glitch (sudden spin-up) is a common phenomenon in pulsar observations. However, the physical mechanism of glitch still matter debate because it depends on puzzle pulsar's inner structure, i.e. equation state dense matter. Some pulsars (e.g. Vela like) show large glitches (Δν/ν ∼ 10−6) but release negligible energy, whereas AXPs/SGRs (anomalous X-ray pulsars/soft gamma repeaters) are usually (but not always) accompanied with detectable energy releases manifesting as bursts or outbursts. We...
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...
Abstract The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has been fully operational since 2020 January 11. We present a comprehensive analysis of the beam structure for each 19 feed horns on FAST's L -band receiver across Stokes I , Q U and V parameters. Using an on-the-fly mapping pattern, we conducted simultaneous sky using all beams directed toward polarization calibrators J1407+2827 J0854+2006 from to 2022. Electromagnetic simulations were also performed model...
Ultrafast pulse characterization is one of the fundamental techniques in ultrafast sciences, including high harmonic attosecond pulses. The in-situ measurement enable all-optical, spatiotemporal determination atto-chirp by applying a perturbing laser field, which believed to introduce only phase modulations In this paper, we have experimentally revisited with collinear or an oblique second-harmonic field. Reduced oscillation contrast ratios even-order intensities are observed experiment, and...
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...
Abstract We analyze and model rapid rotations of polarization orientations in PSR B1919+21’s single pulses based on Five-hundred-meter Aperture Spherical radio Telescope observation data. In more than one-third pulses, the position angle (PA) is found to rotate quasi-monotonically with pulse longitude over 180° or even 360°. Some PA rotates by 540°. Most these quasi-monotonic curves have negative slopes respect longitude. Oscillations circular fraction accompany rotations. This rotation...
Based on the panel data of 31 Chinese provinces and cities from 2010 to 2019, study examines impact professional degree graduate students regional innovation human capital investigated threshold effect spatial agglomeration through fixed-effects model, GMM dynamic quantile regression model. It was found that (1) Since 2010, expansion education in mainland China has been primarily programs, with proportion increasing 24% 58%. (2) The programs contributes accumulation innovative region,...
Abstract X-ray-dim isolated neutron stars (XDINSs) are characterized by Planckian spectra in X-ray bands, but show optical/ultraviolet (UV) excesses: the factors which measured photometry exceeds those extrapolated from spectra. To solve this problem, a radiative model of bremsstrahlung emission plasma atmosphere is established regime strangeon star. A star could simply be regarded as upper layer normal This atmosphere, formed and maintained interstellar-medium-accreted matter due to...
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...
ABSTRACT PSR B0820 + 02 is known to exhibit the subpulse drifting phenomenon, which carries vital information about pulsar radiation process. In this work, we studied of at a central frequency 1250 MHz using Five-hundred-meter Aperture Spherical radio Telescope (FAST). Thanks superior sensitivity FAST, found that shows four distinct modes (A, B, C, and D), last three have not been reported before. The periodicities these are be 4.3P1, 6.4P1, 8.2P1, 10.3P1 (P1 pulse period), respectively. No...
Pulsar-like compact stars provide us a unique laboratory to explore properties of dense matter at supra-nuclear densities. One the models for pulsar-like is that they are totally composed "strangeons", and in this paper, we studied pulsar glitches strangeon star model. Strangeon would be solidified during cooling, solid natural have as result starquakes. Based on starquake model established before, proposed when occurs, inner motion which changes moment inertia has impact glitch sizes,...
Glitch is supposed to be a useful probe into pulsar's interior, but the underlying physics remains puzzling. The glitch activity may reflect lower limit of crustal moment inertia in conventional neutron star models. Nevertheless, its statistical feature could also reproduced strangeon model, which focused here. We formulate normal radio pulsars under framework starquake solid shear modulus matter constrained $\mu\simeq 3\times10^{34}~\rm erg/cm^{3}$, consistent with previous work. about ten...
Abstract Pulsar electrodynamics could be relevant to the physics of stellar surface, which remains poorly understood for more than half a centenary and is difficult probe due absence direct clear observational evidence. Nevertheless, highly sensitive telescopes (e.g., China's Five‐hundred‐meter Aperture Spherical radio Telescope, FAST) may play an essential role solve problem since predicted surface condition would have quite different characteristics in some models pulsar structure,...
Abstract We observed the nearby radio pulsar B0950+08, which has a 100% duty cycle, using Five-hundred-meter Aperture Spherical Radio Telescope. obtained polarization profile for its entire rotation, enabled us to investigate magnetospheric radiation geometry and sparking pattern of polar cap. After we excluded part in linear factor is low (≲30%) potentially contaminated by jumps position angle, rest swing angle fits classical rotating vector model (RVM) well. The best-fit RVM indicates that...
Abstract As one of the paradigm examples to probe into pulsar magnetospheric dynamics, PSR B0943+10 (J0946+0951) manifests representatively, showing a mode switch, orthogonal polarization, and subpulse drifting, frequently studied below 600 MHz. Here, both integrated single pulses are at high frequency (1.25 GHz) with FAST. The switch is using profile decomposition method. A phase space evolution for pulsar’s shows strange-attractor-like pattern. radiative geometry proposed by fitting...
The Beijing Spectrometer (BES) experiment has observed purely leptonic decays of the ${D}_{s}$ meson in reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{+}{D}_{s}^{\ensuremath{-}}$ at a c.m. energy 4.03 GeV. Three events are which one hadronically to $\ensuremath{\varphi}\ensuremath{\pi}$, ${\overline{K}}^{*0}K$, or ${\overline{K}}^{0}K$, and other leptonically $\ensuremath{\mu}{\ensuremath{\nu}}_{\ensuremath{\mu}}$...
The emission geometries, e.g. the region height, beam shape, and radiusto-frequency mapping, are important predictions of pulsar radiation model.The multiband radio observations carry such valuable information.In this paper, we study two bright pulsars, (PSRs B0329+54 B1642-03) observe them in high frequency (2.5 GHz, 5 8 GHz).The newly acquired data together with historical archive provide an atlas multi-frequency profiles spanning from 100 MHz to 10 GHz.We evolution pulse regions these...