Zhen Zhang
A5100390212- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Advanced X-ray Imaging Techniques
- Geophysics and Gravity Measurements
- Geological and Geochemical Analysis
- Radiation Detection and Scintillator Technologies
- Laser-Matter Interactions and Applications
- Galaxies: Formation, Evolution, Phenomena
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Stellar, planetary, and galactic studies
- Model Reduction and Neural Networks
- Particle Detector Development and Performance
- Photonic Crystal and Fiber Optics
Jiangxi University of Traditional Chinese Medicine
2025
University of Chinese Academy of Sciences
2014-2024
Shanghai Jiao Tong University
2024
Institute of High Energy Physics
2008-2024
Chinese Academy of Sciences
2014-2024
Shenzhen University
2024
Shanghai Institute of Ceramics
2019-2024
Yangzhou University
2024
Wuhan University
2024
Harbin University
2023-2024
Abstract Type I gamma-ray bursts (GRBs) are believed to originate from compact binary mergers usually with a duration of main emission less than 2 s. However, recent observations GRB 211211A and 230307A indicate that some merger-origin GRBs could last much longer. Since they show strikingly similar properties (indicating common mechanism), which different the classic “long”-short burst (e.g., 060614), we find form an interesting subclass type GRBs, suggest name them as IL GRB. We prompt is...
Abstract The early afterglow of a gamma-ray burst (GRB) can provide critical information on the jet and progenitor GRB. extreme brightness GRB 221009A allows us to probe its in unprecedented detail. In this Letter, we report comprehensive observation results (from T 0 +660 s +1860 s, where is Insight-HXMT/HE trigger time) X-ray/gamma-ray energy band 20 keV MeV) by Insight-HXMT High Energy X-ray Telescope, GECAM-C, Fermi/Gamma-ray Burst Monitor. We find that spectrum keV–20 MeV be well...
Aiming to address the issues of parameter complexity and high computational load in existing fault detection algorithms for transmission lines, which hinder their deployment on devices like drones, this study proposes a novel lightweight model called Leaner YOLOv7-Tiny. The primary goal is swiftly accurately detect typical faults lines from aerial images. This algorithm inherits ELAN structure YOLOv7-Tiny network replaces its backbone with depthwise separable convolutions reduce parameters....
Abstract The milestone discovery of GW170817-GRB 170817A-AT 2017gfo has shown that gravitational waves (GWs) could be produced during the merger a neutron star–neutron star/black hole and in electromagnetic (EM) waves, gamma-ray burst (GRB) kilonova (KN) are generated sequence after merger. Observationally, however, EM properties before phase still unclear. Here we report peculiar precursor KN-associated long-duration GRB 211211A, providing evidence This lasts ∼0.2 s, waiting time between...
Copper transport 1 (CTR1) plays a critical role in copper uptake by cells, but several studies demonstrated that divalent metal transporter (DMT1) also transports some cells and under certain circumstances. The present study was undertaken to determine the relationship between CTR1 DMT1 uptake. Human umbilical vein endothelial (HUVECs) were exposed increasing concentrations of extracellular cultures, leading increased accumulation proportional copper. However, proteins decreased relation...
Abstract The mysterious dark energy remains one of the greatest puzzles modern science. Current detections for it are mostly indirect. spacetime effects can be locally described by SdS w metric. Understanding these local exactly is an essential step toward direct probe energy. From first principles, we prove that exert a repulsive force on astrophysical scales, different from Newtonian attraction both visible and matter. One way measuring through gravitational deflection light. We geometrize...
Magnetars are neutron stars with extreme magnetic field and sometimes manifest as soft gamma-ray repeaters (SGRs). SGR J1935+2154 is one of the most prolific bursters first confirmed source fast radio burst (i.e. FRB 200428). Encouraged by discovery X-ray counterpart FRB, Insight-Hard Modulation Telescope (Insight-HXMT) implemented a dedicated 33-day long ToO observation since April 28, 2020. With HE, ME, LE telescopes, Insight-HXMT provides thorough monitoring activity evolution J1935+2154,...
Abstract The minimum variation timescale (MVT) of soft gamma-ray repeaters can be an important probe to estimate the emission region in pulsar-like models, as well Lorentz factor and radius possible relativistic jet burst (GRB)–like thus revealing their progenitors physical mechanisms. In this work, we systematically study MVTs hundreds X-ray bursts (XRBs) from SGR J1935+2154 observed by Insight-HXMT, GECAM, Fermi/Gamma-ray Burst Monitor 2014 July 2022 January through Bayesian block...
As the brightest gamma-ray burst ever observed, GRB 221009A provided a precious opportunity to explore spectral line features. In this paper, we performed comprehensive spectroscopy analysis of jointly with GECAM-C and Fermi/GBM data search for emission absorption lines. For first time investigated feature throughout including most bright part where many instruments suffered problems, identified prominent lines in multiple intervals. The central energy Gaussian evolves from about 37 MeV 6...
The Chinese CubeSat Mission, Gamma Ray Integrated Detectors (GRID), recently detected its first gamma-ray burst, GRB 210121A, which was jointly observed by the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM). This burst is confirmed several other missions, including \fermi and \textit{Insight}-HXMT. We combined multi-mission observational data performed a comprehensive analysis of burst's temporal spectral properties. Our results show that relatively...
Abstract Gamma-ray bursts (GRBs) have been identified as one of the most promising sources for Lorentz invariance violation (LIV) studies due to their cosmological distance and energetic emission in wide energy bands. However, arrival-time difference GRB photons among different bands is affected not only by LIV effect but also poorly known intrinsic spectral lags. In previous studies, assumptions lag be made which could introduce systematic errors. this paper, we used a sample 46 short GRBs...
ABSTRACT Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a dedicated mission, launched in December 2020, for gamma-ray transients, including bursts (GRBs) and soft gamma repeater (SGR) the multimessenger multiwavelength astronomy era. Since GECAM consists of two independent spacecrafts (or say instruments), framework data analysis multiple distinctive from that only one spacecraft, which case most GRB missions, we developed pipeline called Energetic...
Abstract We report on radio observations of four magnetars SGR 0501+4516, Swift 1834.9–0846, 1E 1841–045, 1900+14, and a magnetar-like pulsar PSR J1846–0258 with the Five-hundred-meter Aperture Spherical Telescope at 1250 MHz. Notably, was observed 1 month after its 2020 X-ray outburst. The data from these were searched for periodic emissions single pulses. No emission detected any our targets. After accounting effect red noise, nondetections yield stringent upper limits flux density, S ≤...
One of the primary goals Neutron Star Interior Composition Explorer (NICER)-like X-ray missions is to impose stringent constraints on neutron star equation state by precisely measuring their masses and radii. NICER has recently expanded dataset inferred mass-radius relations for stars, including four rotation-powered millisecond pulsars PSR J0030+0451, J0740+6620, J0437-4715, J1231-1411. In this work, relation emitting region properties J1231-1411 are with an independent pulse profile...
Abstract The Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a dedicated mission consisting of multiple instruments on different spacecraft to monitor gamma-ray transients. To meet the requirement GECAM, we developed Energetic Transients Joint Analysis System for Multi-INstrument (ETJASMIN) pipeline, which has been extended incorporate other (such as Fermi-GBM, SVOM/GRM). In this work, introduce ETJASMIN pipeline with focus search, verification, and...
Osteosarcoma, an aggressive bone malignancy predominantly affecting children and adolescents, presents significant therapeutic challenges with a 5-year survival rate below 30% in metastatic cases. T-cell exhaustion, characterized by the overexpression of immune checkpoint molecules, contributes to osteosarcoma progression evasion. Although targeting these inhibitory pathways has shown potential restoring activity, molecular regulators depletion are poorly understood. This study employed...