A5100336387- Geomagnetism and Paleomagnetism Studies
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Laser-Plasma Interactions and Diagnostics
- Characterization and Applications of Magnetic Nanoparticles
- Atmospheric Ozone and Climate
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Ionosphere and magnetosphere dynamics
- Fluid dynamics and aerodynamics studies
- Ion-surface interactions and analysis
- Quantum chaos and dynamical systems
- Advanced Numerical Methods in Computational Mathematics
- Magnetic confinement fusion research
- Theoretical and Computational Physics
- Magnetic and Electromagnetic Effects
- BIM and Construction Integration
- Precipitation Measurement and Analysis
Southwest Jiaotong University
2023-2025
Institute of High Energy Physics
2023
Chinese Academy of Sciences
2023
Université Grenoble Alpes
2022
Institut des Sciences de la Terre
2022
Université Gustave Eiffel
2022
Centre National de la Recherche Scientifique
2022
Durham University
2019-2021
RWTH Aachen University
2021
ETH Zurich
2015-2018
Abstract This article discusses a prescription to compute polarized dimensionally regularized amplitudes, providing recipe for constructing simple and general amplitude projectors in D dimensions that avoids conventional Lorentz tensor decomposition also dimensional splitting. Because of the latter, commutation between index contraction loop integration is preserved within this prescription, which entails certain technical advantages. The usage these D-dimensional results helicity amplitudes...
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...
Hybridizable \(H(\textrm{div})\)-conforming finite elements for symmetric tensors on simplices with barycentric refinement are developed in this work arbitrary dimensions and any polynomial order. By employing an intrinsic tangential-normal (\(t\)-\(n\)) decomposition, novel basis functions constructed to redistribute degrees of freedom while preserving \(H(\textrm{div})\)-conformity symmetry, ensuring inf-sup stability. These hybridizable enhance computational flexibility efficiency,...
A bstract The renormalization constant Z J of the flavor-singlet axial-vector current with a non-anticommuting γ 5 in dimensional regularization is determined to order $$ {\alpha}_s^3 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>α</mml:mi><mml:mi>s</mml:mi><mml:mn>3</mml:mn></mml:msubsup></mml:math> QCD massless quarks. result obtained by computing matrix elements operators appearing axial-anomaly equation {\left[{\partial}_{\mu...
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...
Abstract The Large High Altitude Air Shower Observatory (LHAASO) is located in Haizi Mountain, Daocheng County, Sichuan Province, with an average altitude of 4410 m. Wide Field view Cherenkov Telescope Array (WFCTA) one its three observation arrays. Laser calibration system for WFCTA consists 2 nitrogen lasers and 1 Nd:YAG laser system. During the operation WFCTA, outdoor temperature may dropped from 17 °C to about -30 °C, which will bring serious challenges operating field. In order ensure...
We present a variational optimization method that can identify the most efficient kinematic dynamo in sphere, where efficiency is based on value of magnetic Reynolds number uses enstrophy to characterize inductive effects fluid flow. In this large-scale optimization, we restrict flow be steady and incompressible, boundary sphere no-slip electrically insulating. impose these conditions using Galerkin terms specifically designed vector field bases. solve iteratively for accompanying...
Many flows of electrically conducting fluids can spontaneously generate magnetic fields through the process dynamo action, but when does a flow produce better than another one or is it simply most efficient dynamo? Using variational approach close to that Willis ( Phys. Rev. Lett. , vol. 109, 2012, 251101), we find optimal kinematic dynamos within huge class stationary and incompressible are confined in cube. We demand field satisfies either superconducting (T) pseudovacuum (N) boundary...
The nitrogen laser calibration system for the Wide Field of View Cherenkov Telescope Array (WFCTA) is one most important components Large High Altitude Air Shower Observatory (LHAASO). This composed three parts, including a highprecision 3D lifting and rotating platform (HiRoP), wide field view telescope prototypes. accuracy HiRoP great importance precise WFCTA since it controls beam's pointing direction. A home-made was introduced measurements implies that angular accuracies are better than...
Many recent works on large $N$ holographic QCD in the planar limit have not considered UV completions, restricting exclusively toward analyzing IR physics. Because of this, problems like Landau poles and divergences Wilson loops including instabilities at high temperatures been addressed. In some our papers, we discussed a possible completion, which is conformal confining far IR, that avoids loop divergences. this paper give general field theoretic considerations complete renormalization...
The Large High Altitude Air Shower Observatory (LHAASO) has three sub-arrays, KM2A, WCDA and WFCTA. flux variations of cosmic ray air showers were studied by analyzing the KM2A data during thunderstorm on 10 June 2021. number shower events that meet trigger conditions increases significantly in atmospheric electric fields, with maximum fractional increase 20%. rates (increases or decreases) are found to be strongly dependent primary zenith angle. secondary particles significantly, following...
Abstract A systematic investigation of the plasma response to an externally applied resonant magnetic perturbation (RMP) field, for purpose controlling edge localized modes, is carried out EU DEMO reference plasma. Particular emphasis placed on role kinetic effects associated with both thermal particles and fusion-born alphas. The single fluid, resistive model predicts a large peak amplification n = 1 ( toroidal mode number) target equilibrium, which found be close Troyon no-wall limit. more...
The Be-based materials with many particular properties lead to an important research subject. investigation progresses in the fabrication technologies are introduced here, including main three kinds of materials, such as Be–Cu capsule, $\text{Be}_{2}\text{C}$ ablator and high-purity Be material. Compared pioneer workgroup on differences target were described, a grain refinement technique by active hydrogen reaction for coating was proposed uniquely. coatings first prepared DC reactive...
In recent years, several optimal dynamos have been discovered. They minimize the magnetic energy dissipation or, equivalently, maximize growth rate at a fixed Reynolds number. dynamo of Willis (2012, Phys. Rev. Lett. 109, 251101), we find mean-field action for planar averages. One component field grows exponentially while other decays in an oscillatory fashion near onset. This behavior is different from that alpha^2 dynamo, where two non-vanishing components averages are coupled and same...
Planetary magnetic fields are generated by the motion of conductive fluid in planet's interior. Complex flows not required for dynamo action; simple have been shown to act as efficient kinematic dynamos, whose physical characteristics more straightforward study. Recently, Chen et al . (2018, J. Fluid Mech. 839 , 1–32. ( doi:10.1017/jfm.2017.924 )) found optimal, unconstrained a sphere, which, despite being theoretical importance, is limited practical use. We extend their work restricting...
One conforming and one non-conforming virtual element Hessian complexes on tetrahedral grids are constructed based decompositions of polynomial tensor space. They applied to discretize the linearized time-independent Einstein-Bianchi system.
Ultrashort multi-ke V x-ray pulses are generated by electron plasma produced the irradiation of femtosecond on metals. These sub-picosecond have extended field spectroscopy into time domain. However, pulse-to-pulse instability and long data acquisition restrict application ultrashort systems operating at low repetition rates. Here we report performance a laser plasma-induced hard source that operates 1-k Hz rate, provides flux 2.0 × 1010 photons/s Cu Kαradiation. Using this system for...
Described in this paper is a logic-modeling framework, based on fuzzy neural networks (FNNs) to identify causal relationships among variables. A case study presented from the industrial construction domain demonstrate capability of proposed system finding plausible explanations observed performance failures.
The Wide Field of View Cherenkov Telescope Array (WFCTA), situated in the harsh environment Daocheng, is established to investigate ultrahigh energy cosmic rays. To enhance calibration WFCTA, a portable laser system has been developed, which provides specified and direction YAG laser. Special designs, including power system, north calibration, rotating have implemented ensure proper functioning system. aluminum alloy entire frame vibration damper provide robust anti-impact ability safety...
In this talk, we discuss the calculation of renormalization constant flavor-singlet axial-vector current with a non-anticommuting $\gamma_5$ in dimensional regularization determined to order $\alpha_s^3$ QCD massless quarks. addition briefly comment on subtlety renormalized form an axial-current component given quark flavor, and closely related formulae singlet contribution axial factor, as well group equations.
A variational optimization approach is used to optimize kinematic dynamos in a unit sphere and locate the enstrophy-based critical magnetic Reynolds number for dynamo action. The boundary condition chosen be either pseudo-vacuum or perfectly conducting. Spectra of optimal flows corresponding these two conditions are identical since theory shows that they relatable by reversing flow field (Favier & Proctor 2013 Phys. Rev. E 88 , 031001 ( doi:10.1103/physreve.88.031001 )). no-slip gives...
Given a passive tracer distribution $f(x,y)$ , what is the simplest unstirred pattern that may be reached under incompressible advection? This question partially motivated by recent studies of three-dimensional (3-D) magnetic reconnection, in which patterns topological invariant called field line helicity greatly simplify until reaching relaxed state. We test two approaches: variational method with minimal constraints, and relaxation scheme where velocity determined explicitly $f$ . Both...