N. J. Zhang
A5063671658- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Ionosphere and magnetosphere dynamics
- Particle physics theoretical and experimental studies
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Radiation Therapy and Dosimetry
- Hydraulic Fracturing and Reservoir Analysis
- Drilling and Well Engineering
- Acute Ischemic Stroke Management
- Photonic and Optical Devices
- Solar Radiation and Photovoltaics
- Trauma and Emergency Care Studies
- Computational Physics and Python Applications
- Perovskite Materials and Applications
- Pulsars and Gravitational Waves Research
- Venous Thromboembolism Diagnosis and Management
- High-Energy Particle Collisions Research
- Cardiovascular Health and Disease Prevention
- Spaceflight effects on biology
Nanjing Normal University
2025
Shanghai Institute of Technology
2024
Hainan Medical University
2024
Sichuan University
2024
Xi’an University of Posts and Telecommunications
2023
Shandong University
1999-2011
Tibet University
2007
Hirosaki University
2006
Saitama University
2006
Institute of High Energy Physics
2006
The intensity of Galactic cosmic rays is nearly isotropic because the influence magnetic fields in Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV), using large data sample Tibet Air Shower Arrays. Besides revealing finer details known anisotropies, new component ray sidereal time uncovered around Cygnus region direction. For cosmic-ray up TeV, all components anisotropies fade away, showing...
We present an updated all-particle energy spectrum of primary cosmic rays in a wide range from 1014 to 1017 eV using 5.5 × 107 events collected 2000 November through 2004 October by the Tibet-III air-shower array located 4300 m above sea level (an atmospheric depth 606 g cm−2). The size exhibits sharp knee at corresponding around 4 PeV. This work uses increased statistics and new simulation calculations for analysis. discuss our extensive Monte Carlo model dependencies involved final result,...
The Tibet-III air shower array, consisting of 533 scintillation detectors, has been operating successfully at Yangbajing in Tibet, China since 1999. Using the data set collected by this array from 1999 November through 2005 November, we obtained energy spectrum γ-rays Crab Nebula, expressed a power law as (dJ/dE) = (2.09 ± 0.32) × 10−12(E/3 TeV)−2.96±0.14 cm−2 s−1 TeV−1 range 1.7–40 TeV. This result is consistent with other independent γ-ray observations imaging Cherenkov telescopes. In...
Results on steady TeV $\gamma$-ray point source search using data taken from the Tibet HD (Feb. 1997 -- Sep. 1999) and III (Nov. 1999 Oct. 2001) arrays are presented. From $0^{\circ}$ to $60^{\circ}$ in declination, significant excesses well-known Crab Nebula high state of flare type Markarian 421 observed. Because levels significance other positions not sufficiently high, 90% confidence level upper limits flux set assuming different power law spectra. To allow crosschecking, two...
Several strong TeV γ-ray flares were detected from Mrk 421 in the years 2000 and 2001 by Tibet III air shower array at a level of statistical significance 5.1 σ. was unprecedentedly active X-ray energies during this period, positive correlation found between change all-sky monitor Rossi X-Ray Timing Explorer flux flux. When power-law energy spectrum for γ-rays source is assumed, spectral index calculated to be -3.24 ± 0.69 most phase 2001. The observed consistent with those obtained via...
Microwave photonic (MWP) frequency-modulated continuous-wave (FMCW) radars break through the bandwidth limitations of electronic radar by frequency multiplication and mixing. However, it induces additional phase noise to signal, which is undesirable for target detection recognition. To deal with this issue, paper presents experimentally demonstrates a MWP FMCW suppressed equal interval sampling. The broadened multiplier, split into two paths. One path delayed optical fiber as reference other...
Introduction Rescuing individuals at sea is a pressing global public health issue, garnering substantial attention from emergency medicine researchers with focus on improving prevention and control strategies. This study aims to develop Dynamic Bayesian Networks (DBN) model utilizing maritime incident data compare its forecasting accuracy Auto-regressive Integrated Moving Average (ARIMA) Seasonal (SARIMA) models. Methods In this research, we analyzed the count of cases managed by five...
We report on the solar diurnal variation of galactic cosmic-ray intensity observed by Tibet III air shower array during period from 1999 to 2003. In higher-energy event samples (12 and 6.2 TeV), variations are fairly consistent with Compton-Getting anisotropy due terrestrial orbital motion around Sun, while in lower-energy sample (4.0 TeV) is inconsistent this anisotropy. This suggests an additional superposed at multi-TeV energies, e.g., modulation effect. highest-precision measurement ever made.
Using the Tibet-III air shower array, we search for TeV γ-rays from 27 potential Galactic sources in early list of bright obtained by Fermi Large Area Telescope at energies above 100 MeV. Among them, observe seven instead expected 0.61 a significance 2σ or more excess. The chance probability Poisson statistics would be estimated to 3.8 × 10−6. If excess distribution observed array has density gradient toward plane, number may enhanced association. Then, rises slightly, 1.2 10−5, based on...
We show that the large‐scale anisotropy of ∼5 TeV galactic cosmic ray (GCR) intensity observed by Tibet Air Shower experiment can be reproduced superposition a bi‐directional and uni‐directional flows (UDF BDF) GCRs. The heliosphere is located inside local interstellar cloud (LIC) very close to inner edge LIC. If GCR population lower LIC than outside, BDF flow expected from parallel diffusion GCRs into along magnetic field (LISMF) connecting with region outside LIC, where higher. A type UDF,...
We have shown that the Sun's shadow by high-energy cosmic rays moves year and its behavior is correlated with a time variation of large-scale structure solar interplanetary magnetic fields. The activity was near minimum in period from 1996 through 1997. Using data obtained Tibet air shower array, we examined shadowing Sun this quiet phase cycle found just apparent direction Sun, though it observed at position considerably away to southwest between 1990 1993. It known pole equivalent dipole...
Zn doped Cs 3 Cu 2 Cl 5 exhibited green luminesce with an enhanced photoluminescence quantum yield (PLQY) (70.19%), nearly twice the PLQY of . The corresponding WLED exhibits high CRI (95.8) and suitable CCT (4573 K).
The amplitude of the Compton-Getting (CG) anisotropy contains powerlaw index cosmic-ray energy spectrum.Based on this relation and using Tibet air-shower array data, we measure spectral to be -3.03±0.55stat ± < 0.62 syst between 6 TeV 40 TeV, consistent with -2.7 from direct spectrum measurements.Potentially, CG analysis can utilized confirm astrophysical origin "knee" against models for non-standard hadronic interactions in atmosphere.
The primary-cosmic-ray proton flux >1015 eV is derived through analyses on superhigh-energy halo events observed by the Mt. Fuji and Kanbala emulsion-chamber experiments. Interpretations are made for origin of based Monte Carlo simulation, which clarifies sensitivity to primary-composition nuclear-interaction models. It shown that intensity most sensitive primary feature fragmentation region multiple production. estimated as nearly 3 times less than extrapolated low-energy measurement Ryan...
Recent results and future prospects of the Tibet air-shower experiment are reported on all-particle energy spectrum chemical composition cosmic rays around 10 15 eV range. The knee has been clearly observed at 4 ×10 by III array located Yangbajing, Tibet, China (atmospheric depth 606 g/cm 2 , area 37,000 m ). light components (protons helium) measured air-shower-core detector exhibits steeper power index than that direct measurements below 14 eV, leading to decreasing fraction component...
Accurate reporting of outcomes is crucial for interpreting the results randomized controlled trials (RCTs). However, selectively in publications to achieve researchers' anticipated still occurs frequently. This study aims investigate prevalence selective RCTs on treating acute ischemic stroke (AIS), identify factors contributing this issue, and assess its potential impact degree direction intervention effect. A search was conducted MEDLINE, Embase, Cochrane Library collect interventional AIS...