S. J. Zheng
A5038828829- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Nuclear physics research studies
- Ionosphere and magnetosphere dynamics
- Statistical and numerical algorithms
- Photonic and Optical Devices
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Mechanics and Biomechanics Studies
- Magnetic confinement fusion research
- Astronomical and nuclear sciences
- Advanced Fiber Optic Sensors
- Inertial Sensor and Navigation
- Medical Imaging and Analysis
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Earthquake Detection and Analysis
- Retinal Diseases and Treatments
The Affiliated Yongchuan Hospital of Chongqing Medical University
2023-2025
Chongqing Medical University
2023-2025
Nanjing Forestry University
2025
Institute of High Energy Physics
2015-2024
Chinese Academy of Sciences
2015-2024
Zhongda Hospital Southeast University
2023-2024
University of Chinese Academy of Sciences
2020-2024
Fuzhou University
2024
Northwestern Polytechnical University
2024
Central South University
2023
The brightest Gamma-ray burst, GRB 221009A, has spurred numerous theoretical investigations, with particular attention paid to the origins of ultra-high energy TeV photons during prompt phase. However, analyzing mechanism radiation in $\sim$MeV range been difficult because high flux causes pile-up and saturation effects most detectors. In this letter, we present systematic modeling time-resolved spectra using unsaturated data obtained from Fermi/GBM (precursor) SATech-01/GECAM-C (main...
This article provides a review on X-ray pulsar-based navigation (XNAV). The starts with the basic concept of XNAV, and briefly introduces past, present future projects concerning XNAV. paper focuses advances key techniques supporting including pulsar database, detection system, pulse time arrival estimation. Moreover, methods to improve estimation performance XNAV are reviewed. Finally, some remarks development provided.
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...
Abstract Fast radio bursts (FRBs) are short pulses observed in band from cosmological distances, some of which emit repeating bursts. The physical origins these mysterious events have been subject to wide speculations and heated debates. One class models invoke soft gamma-ray repeaters (SGRs), or magnetars, as the sources FRBs. Magnetars rotating neutron stars with extremely strong magnetic field can sporadically X-ray (keV) (sub-MeV) duration 102 s 102 s. However, even though bright no...
The origin(s) and mechanism(s) of fast radio bursts (FRBs), which are short pulses from cosmological distances, have remained a major puzzle since their discovery. We report strong Quasi-Periodic Oscillation(QPO) 40 Hz in the X-ray burst magnetar SGR J1935+2154 associated with FRB 200428, significantly detected Hard Modulation Telescope (Insight-HXMT) also hinted by Konus-Wind data. QPOs only been rarely detected; our 3.4 sigma (p-value is 2.9e-4) detection QPO reported here reveals...
Background Methods for grading and localization of lumbar disc herniation (LDH) on MRI are complex, time‐consuming, subjective. Utilizing deep learning (DL) models as assistance would mitigate such complexities. Purpose To develop an interpretable DL model capable localizing LDH. Study Type Retrospective. Subjects 1496 patients (M/F: 783/713) were evaluated, randomly divided into training (70%), validation (10%), test (20%) sets. Field Strength/Sequence 1.5T axial T2‐weighted sequences (spin...
ABSTRACT High time resolution and accuracy are of critical importance in the studies timing analysis delay localization gamma-ray bursts (GRBs), soft repeaters (SGRs) pulsars. The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) consisting two micro-satellites, GECAM-A GECAM-B, launched on 2020 December 10, is aimed at monitoring locating X-ray GRBs all over sky. To achieve its scientific goals, GECAM designed to have highest (0.1 $\mu {\rm s}$) among GRB...
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...
In this work, we report the in-orbit demonstration of X-ray pulsar navigation with Insight-Hard Modulation Telescope (Insight-HXMT), which was launched on Jun. 15th, 2017. The new method 'Significance Enhancement Pulse-profile Orbit-dynamics' (SEPO) is adopted to determine orbit observations only one pulsar. test, Crab chosen and observed by Insight-HXMT from Aug. 31th Sept. 5th in Using 5-day-long observation data, determined successfully three telescopes onboard - High Energy (HE), Medium...
ABSTRACT We report on the Insight-HXMT observations of new black hole X-ray binary MAXI J1820+070 during its 2018 outburst. Detailed spectral analysis via continuum fitting method shows an evolution inferred spin high soft sate. Moreover, hardness ratio, non-thermal luminosity and reflection fraction also undergo evolution, exactly coincident to period when transition takes place. The unphysical is attributed inner disc, which caused by collapse a hot corona due condensation mechanism or may...
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...
The recent flight experiments with Neutron Star Interior Composition Explorer (\textit{NICER}) and \textit{Insight}-Hard X-ray Modulation Telescope (\textit{Insight}-HXMT) have demonstrated the feasibility of pulsar-based navigation (XNAV) in space. However, current pulse phase estimation methods employed above are computationally too expensive for handling Crab pulsar data. To solve this problem, paper proposes a fast algorithm on-orbit estimating called navigaTion usIng on-orbiT pulsAr...
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 Spectral lag of the low-energy photons with respect to high-energy ones is a common astrophysical phenomenon (such as gamma-ray bursts and Crab Pulsar) may serve key probe underlying radiation mechanism. However, spectral in keV range magnetar has not been systematically studied yet. In this work, we perform detailed analysis Li et al.’s Cross-Correlation Function (Li-CCF) method for SGR J1935+2154 observed by Insight-Hard X-ray Modulation Telescope (HXMT), Gravitational Wave...
Abstract Magnetars are neutron stars with ultrahigh magnetic fields (~10 14 –10 15 G). The magnetar SGR J1935+2154 is not only one of the most active magnetars detected so far, but also unique confirmed source fast radio bursts. Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor (GECAM) dedicated to monitor gamma-ray transients all over sky, including short Here we report GECAM observations burst activity from 2021 January 2022 December, which results in a and...
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...
Abstract Curcumin is a natural polyphenol extracted from plants that interacts with various molecular targets and exhibits antioxidant, antibacterial, anticancer, anti-aging properties. Due to its pharmacological activities high safety margin, curcumin has been used in the prevention treatment of diseases, including Alzheimer's, heart, rheumatic immune diseases. To develop eye drops can be as antioxidant antibacterial agents after phacoemulsification, we designed nano-based drug delivery...