X. T. Feng
A5078665178- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Radiation Therapy and Dosimetry
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Meteorological Phenomena and Simulations
- Topic Modeling
- Ocean Waves and Remote Sensing
- Calibration and Measurement Techniques
- Pulsars and Gravitational Waves Research
- Intelligent Tutoring Systems and Adaptive Learning
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Ionosphere and magnetosphere dynamics
- Noncommutative and Quantum Gravity Theories
- Advanced Text Analysis Techniques
Shandong University
2022-2025
Tibet University
2024
Zhejiang Lab
2024
Lanzhou University
2024
Abstract We present the first catalog of very-high-energy and ultra-high-energy gamma-ray sources detected by Large High Altitude Air Shower Observatory. The was compiled using 508 days data collected Water Cherenkov Detector Array from 2021 March to 2022 September 933 recorded Kilometer Squared 2020 January September. This represents main result most sensitive large coverage survey sky above 1 TeV, covering decl. −20° 80°. In total, contains 90 with an extended size smaller than 2° a...
We present the measurements of all-particle energy spectrum and mean logarithmic mass cosmic rays in range 0.3-30 PeV using data collected from LHAASO-KM2A between September 2021 December 2022, which is based on a nearly composition-independent reconstruction method, achieving unprecedented accuracy. Our analysis reveals position knee at 3.67±0.05±0.15 PeV. Below knee, spectral index found to be -2.7413±0.0004±0.0050, while above it -3.128±0.005±0.027, with sharpness transition measured...
The kilometer square array (KM2A) of the large high altitude air shower observatory (LHAASO) aims at surveying northern γ-ray sky energies above 10 TeV with unprecedented sensitivity. observations have long been one most powerful tools for dark matter searches, as, e.g., high-energy γ rays could be produced by decays heavy particles. In this Letter, we present first analysis LHAASO-KM2A, using 340 days data from 1/2-KM2A and 230 3/4-KM2A. Several regions interest are used to search a signal...
Abstract The first source catalog of the Large High Altitude Air Shower Observatory (LHAASO) reported detection a very high energy gamma-ray source, 1LHAASO J1219+2915. This Letter presents further detailed study spectral and temporal behavior this pointlike source. best-fit position TeV (R.A. = 185.°05 ± 0.°04, decl. 29.°25 0.°03) is compatible with NGC 4278 within ∼0.°03. Variation analysis shows an indication variability on timescale few months in band, which consistent low-frequency...
On 9 October 2022, the Large High Altitude Air Shower Observatory (LHAASO) reported observation of very early TeV afterglow brightest-of-all-time gamma-ray burst 221009A, recording highest photon statistics in band ever obtained from a burst. We use this unique to place stringent constraints on energy dependence speed light vacuum, manifestation Lorentz invariance violation (LIV) predicted by some quantum gravity (QG) theories. Our results show that 95% confidence level lower limits QG...
The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius $\sim$ 2.5 $\arcmin$. Although no extension this source has been detected in $\gamma$-ray band, using more than 1000 days LHAASO data above $\sim 0.8$ TeV, we find that its spectrum significantly softer those obtained Imaging Air Cherenkov Telescopes (IACTs) and flux near 1$ TeV about two times higher. In combination analyses 16 years \textit{Fermi}-LAT...
The application of large language models (LLMs) in the medical field has gained significant attention, yet their reasoning capabilities more specialized domains like anesthesiology remain underexplored. In this paper, we systematically evaluate LLMs and analyze key factors influencing performance. To end, introduce AnesBench, a cross-lingual benchmark designed to assess anesthesiology-related across three levels: factual retrieval (System 1), hybrid 1.x), complex decision-making 2). Through...
This study utilizes radar, sounding observations, and convective-permitting simulations with a non-hydrostatic mesoscale model to investigate the effects of gravity waves originating from southwest mountain on intensification extreme precipitation event occurred in Henan Province, Central China, July 2021 (referred as “21.7” event). The have wave speeds approximately 11.5 m s-1 wavelengths ranging 60 90 km. These are generated by interaction between northwest-southeast direction (Funiu...
We present the measurements of all-particle energy spectrum and mean logarithmic mass cosmic rays in range 0.3-30 PeV using data collected from LHAASO-KM2A between September 2021 December 2022, which is based on a nearly composition-independent reconstruction method, achieving unprecedented accuracy. Our analysis reveals position knee at $3.67 \pm 0.05 0.15$ PeV. Below knee, spectral index found to be -$2.7413 0.0004 0.0050$, while above it -$3.128 0.005 0.027$, with sharpness transition...
The attenuation length of the muon content in extensive air showers provides important information regarding generation and development showers. This can be used not only to improve description such but also test fundamental models hadronic interactions. Using data from LHAASO-KM2A experiment, high-energy was studied. measured experimental energy range 0.3 30 PeV using constant intensity cut method. By comparing with predictions interaction (-II-04, 2.3d, -), it is evident that LHAASO...