A5034532127- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Peer-to-Peer Network Technologies
- High-pressure geophysics and materials
- Caching and Content Delivery
- Galaxies: Formation, Evolution, Phenomena
- Mechanics and Biomechanics Studies
- Radio Astronomy Observations and Technology
- Atomic and Molecular Physics
- Synthesis and Catalytic Reactions
- Advanced Steganography and Watermarking Techniques
- Organic Electronics and Photovoltaics
- Insurance and Financial Risk Management
- Parallel Computing and Optimization Techniques
- IoT and Edge/Fog Computing
- Complex Network Analysis Techniques
- Asymmetric Hydrogenation and Catalysis
- Stellar, planetary, and galactic studies
- Radiation Therapy and Dosimetry
- Particle Accelerators and Free-Electron Lasers
- earthquake and tectonic studies
- Network Packet Processing and Optimization
- Multimedia Communication and Technology
Anhui Polytechnic University
2025
Hainan Normal University
2023-2024
Nanjing University
2017-2024
Ministry of Education of the People's Republic of China
2009-2024
Bar-Ilan University
2023-2024
Northwest University
2024
Chinese Academy of Sciences
2007-2011
University of Chinese Academy of Sciences
2011
Shanghai Institute of Applied Physics
2011
Institute of Computing Technology
2007
Gamma-ray bursts (GRBs) are the most luminous explosions and can be detectable out to edge of Universe. It has long been thought they extend Hubble diagram very high redshifts. Several correlations between temporal or spectral properties GRB luminosities have proposed make GRBs cosmological tools. However, those cannot properly standardized. In this paper, we select a sample with X-ray plateau phases produced by electromagnetic dipole emissions from central new-born magnetars. A tight...
Fast radio bursts (FRBs) are cosmic sources emitting millisecond-duration bursts. Although several hundreds FRBs have been discovered, their physical nature and central engine remain unclear. The variations of Faraday rotation measure dispersion measure, due to local environment, crucial clues understanding nature. recent observations on the FRB 20201124A show a significant variation day time scale. Intriguingly, oscillation supports that contribution can change sign, which indicates...
Recent observations discovered that some repeating fast radio bursts (FRBs) show complicated variations and reversals of Faraday rotation measures (RMs), indicating the sources these FRBs are embedded in a dynamically magnetized environment. One possible scenario is generated by pulsars binary systems, especially containing high-mass companion with strong stellar outflows. Here, we study RM caused winds, disc. If magnetic field radial wind, will not reverse except if axis inclination angle...
Abstract The study of magnetically arrested disks (MAD) has attracted strong interest in recent years because these disk configurations were found to generate jets, as observed many accreting systems. Here, we present the results 14 general relativistic magnetohydrodynamic simulations advection-dominated accretion flow MAD state across black hole (BH) spins, carried out with cuHARM. Our main findings are follows. (i) jets transport a significant amount angular momentum infinity form Maxwell...
In this paper, we present statistics of soft gamma repeater (SGR) bursts from SGR J1550-5418, 1806-20 and 1900+14 by adding new K{\i}rm{\i}z{\i}bayrak et al. (2017) detected with the Rossi X-ray Timing Explorer (RXTE). We find that fluence distributions magnetar are well described power-law functions indices 1.84, 1.68, 1.65 for 1900+14, respectively. The duration also show forms. Meanwhile, waiting time distribution can be a non-stationary Poisson process an exponentially growing occurrence...
Abstract We calculate the dispersion measures (DMs) contributed by host galaxies of fast radio bursts (FRBs). Based on a few galaxy observations, large sample with similar properties to observed ones has been selected from IllustrisTNG simulation. They are used compute distributions DMs for repeating and nonrepeating FRBs. For FRBs, we infer DM FRBs like FRB 121102 180916 assuming that burst sites tracing star formation rates in galaxies. The median 35 (1 + z ) 1.08 96(1 0.83 pc cm −3...
Pterostilbene (PTS) has multiple benefits, but poor water solubility and bioavailability limit its application. PTS/β-CD inclusion complexes were synthesized through the phase method to enhance their solubility. The characterized Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, nuclear magnetic resonance, molecular docking techniques. results demonstrated that PTS β-CD successfully created with a host–guest ratio of 1:1 stability constant 166.7 M−1....
In this paper, we study the luminosity function and formation rate of short gamma-ray bursts (sGRBs). Firstly, derive $E_p-L_p$ correlation using 16 sGRBs with redshift measurements determine pseudo redshifts 284 Fermi sGRBs. Then, use Lynden-Bell c$^-$ method to without any assumptions. A strong evolution $L(z)\propto (1+z)^{4.47}$ is found. After removing evolution, $ \Psi (L) \propto L_0 ^ {- 0.29 \pm 0.01} for dim \psi 1.07 bright sGRBs, break point $8.26 \times 10^{50} erg s$^{-1}$. We...
Abstract Fast radio bursts (FRBs) are millisecond transients with large dispersion measures. An outstanding question is the relation between repeating FRBs and those a single burst. In this paper, we study energy distribution of FRB 121102. For power-law <?CDATA ${dN}/{dE}\propto {E}^{-{\alpha }_{E}}$?> , show that value α E in narrow range 1.6–1.8 for observed by different telescopes at frequencies, which indicates universal Interestingly, similar index nonrepeating Parkes ASKAP also found....
The first complete measurement of the Chinese Internet topology at autonomous systems (AS) level based on traceroute data probed from servers major ISPs in mainland China is presented. Both AS graph and global can be accurately reproduced by positive-feedback preference model with same parameters. This result suggests that preserves well topological characteristics Internet. demonstration Internet's fractality, or self-similarity, performed evolution modelling.
Abstract Recently, the discovery of Galactic FRB 200428 associated with an X-ray burst (XRB) SGR 1935+2154 has built a bridge between FRBs and magnetar activities. In this Letter, we assume that XRB occurs in magnetosphere. We show observational properties are consistent predictions synchrotron maser emission at ultrarelativistic magnetized shocks, including radiation efficiency, similar energy occurrence frequency distributions, simultaneous arrive times. It requires upstream medium is...
Fast radio bursts (FRBs) are bright milliseconds transients with large dispersion measures. Recently, FRB 200428 was detected in temporal coincidence a hard X-ray flare from the Galactic magnetar SGR 1935+2154, which supports that at least some FRBs activity. Interestingly, portion of flares XTE J1810-197 and Sun also accompanied by bursts. Many features cosmological resemble solar However, common physical origin among FRBs, pulses has not yet been established. Here we report universal...
Abstract The energy and waiting time distributions are important properties for understanding the physical mechanism of repeating fast radio bursts (FRBs). Recently, Five-hundred-meter Aperture Spherical Telescope (FAST; Nan et al. 2011; Li 2018) detected largest burst sample FRB 121102, containing 1652 (2021a) We use this to investigate distributions. count distribution dN / dE at high-energy range (>10 38 erg) can be fitted with a single power-law function an index <mml:math...
Abstract We performed a systematic search for X-ray bursts of the SGR J1935+2154 using Fermi Gamma-ray Burst Monitor continuous data dated from 2013 January to 2021 October. Eight bursting phases, which consist total 353 individual bursts, are identified. further analyze periodic properties our sample Lomb–Scargle periodogram. The result suggests that those exhibit period ∼238 days with ∼63.2% duty cycle. Based on analysis, we predict two upcoming active windows bursts. Since July, beginning...
Abstract We introduce a new GPU-accelerated general relativistic magnetohydrodynamic code based on HARM, which we call cuHARM. The is written in CUDA-C and uses OpenMP to parallelize multi-GPU setups. Our allows us run high-resolution simulations of accretion disks the formation structure jets without need for multinode supercomputer infrastructure. A 256 3 simulation well within reach an Nvidia DGX-V100 server, with computation being about 10 times faster than if only CPU used. use this...
In this paper, we investigate the energy function, formation rate, and environment of fast radio bursts (FRBs) using Parkes sample Australian Square Kilometer Array Pathfinder (ASKAP) sample. For first time, metallicity effect on rate is considered. If FRBs are produced by mergers compact binaries, should have a time delay relative to cosmic star (CSFR). We get about 3–5 Gyr index differential function γ (dN/dE∝E−γ) between 1.6 2.0 from redshift cumulative distribution. The value similar...
Abstract Magnetars are highly magnetized neutron stars that characterized by recurrent emission of short-duration bursts in soft gamma-rays/hard X-rays. Recently, FRB 200428 was found to be associated with an X-ray burst from a Galactic magnetar. Two fast radio show mysterious periodic activity. However, it is unclear whether magnetar phenomena. In this paper, we investigate the activity period SGR 1806-20. More than 3000 short observed different telescopes collected, including observations...
Fast radio bursts (FRBs) are extragalactic, bright pulses of emission at frequency with milliseconds duration. Observationally, FRBs can be divided into two classes, repeating and non-repeating FRBs. At present, twenty have been discovered unknown physical origins. Localization the first FRB 121102 discovery an associated persistent source support that powered by young millisecond magnetars, which could formed core-collapses massive stars or binary neutron mergers. These formation channels...
Abstract Accompanied by an X-ray burst, the fast radio burst (FRB) FRB 200428 was recently confirmed as originating from Galactic magnetar soft gamma repeater (SGR) SGR J1935+2154. Just before and after detected, Five-hundred-meter Aperture Spherical Telescope (FAST) had been monitoring J1935+2154 for eight hours. From UTC 2020 April 27 23:55:00 to 28 00:50:37, FAST detected no pulsed emission J1935+2154, while Fermi/Gamma-ray Burst Monitor registered 34 bursts in X/soft γ -ray band, forming...
Since the discovery of FRB 200428 associated with Galactic SGR 1935+2154, magnetars are considered to power fast radio bursts (FRBs). It is widely believed that could form by core-collapse (CC) explosions and compact binary mergers, such as neutron star (BNS), white dwarfs (BWD), star-white dwarf (NSWD) mergers. Therefore, it important distinguish various progenitors. The expansion merger ejecta produces a time-evolving dispersion measure (DM) rotation (RM) can probe local environments FRBs....