A5101934668- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Nonlinear Photonic Systems
- Strong Light-Matter Interactions
- Nonlinear Waves and Solitons
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Spectroscopy and Quantum Chemical Studies
- Laser-Matter Interactions and Applications
- Quantum Information and Cryptography
- Numerical methods for differential equations
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Model Reduction and Neural Networks
- Evacuation and Crowd Dynamics
- Free Radicals and Antioxidants
- Infection Control and Ventilation
- Electromagnetic Simulation and Numerical Methods
- Molecular spectroscopy and chirality
- Hydrocarbon exploration and reservoir analysis
- Quantum Mechanics and Applications
- Control and Dynamics of Mobile Robots
- Noise Effects and Management
- Geological and Geophysical Studies
- Dynamics and Control of Mechanical Systems
Shenyang Normal University
2014-2019
Chinese Academy of Sciences
2013
Jilin Medical University
2006
Jilin University
2004
Université de Montréal
1992-1997
The discrete variable representation (DVR) is used to calculate vibrational energy levels of H2O and SO2. Hamiltonian written in terms bond length–bond angle coordinates their conjugate momenta. It shown that although these are not orthogonal the appropriate kinetic operator complicated, quite simple facilitates calculation levels. DVR enables one use an internal coordinate without expanding dependence or evaluating matrix elements numerically. accuracy previous calculations assessed.
Resolution smearing is a critical challenge in the quantitative analysis of two-dimensional small-angle neutron scattering (SANS) data, particularly studies soft matter flow and deformation using SANS. We present central moment expansion technique to address anisotropic spectra, offering model-free desmearing methodology. By accounting for directional variations resolution enhancing computational efficiency, this approach reconstructs desmeared intensity distributions from smeared...
We present an exact Eckart-embedded kinetic energy operator in bond coordinates for triatomic molecules. The is derived from the general equations of J. Chem. Phys. 107, 2813 (1997) Eckart frame and method Handy. Coriolis terms Eckart-bond do not depend on angle between in-plane axis equilibrium vector. compare to other operators show that are smallest. should be useful calculating analyzing ro-vibrational spectra.
By using the discrete variational method, we study numerical method of general nonholonomic system in generalized Birkhoffian framework, and construct a equations called self-adjoint-preserving algorithm. Numerical results show that it is reasonable to by structure-preserving algorithm framework.
The tunneling effect of Bose—Einstein condensate (BEC) in a harmonic trap with Gaussian energy barrier is studied this paper. initial evolves into two separate moving condensates after the time under certain conditions. interference pattern between given as comparison and further demonstration existence global phase.
We investigate the effect of an external periodic modulation on one-dimensional (1D) Bose—Einstein condensate with harmonic trapping potential. By numerically solving Gross—Pitaevskii equation symplectic algorithm, nonlinear resonance phenomenon is shown and corresponding Fourier spectrum given. The autoresonance also presented under almost modulation, it shows that eventually evolves into quasi-periodic oscillation.
In this paper, we present a new integration algorithm based on the discrete Pfaff—Birkhoff principle for Birkhoffian systems. It is proved that can preserve general symplectic geometric structures of A numerical experiment damping oscillator system conducted. The result shows better simulate energy dissipation than R-K method, which illustrates numerically solve dynamical equations by variational method in framework systems with structure. Furthermore, it demonstrated results experiments are...
We have studied the dynamics of Bose—Einstein condensate by solving numerically Gross-Pitaevskii (GP) equation. examined periodic behaviour in a shifted harmonic potential, and further demonstrated tunneling effect through Gaussian energy barrier, which is inserted after has been excited shifting trapping potential to side. Moreover, it shown that initial evolves dynamically into two separate moving condensates time under certain conditions.
We study the dynamics of cubic–quintic nonlinear Schrodinger equation by symplectic method. The behaviors are discussed with harmonically modulated initial conditions, and contributions from quintic term discussed. observe elliptic orbit, homoclinic orbit crossing, quasirecurrence, stochastic motion different parameters in this system. Numerical simulations show that changing processes system trajectories phase space various for cubic increase parameter.
The performance of a four fold segmented clover detector coupled to CsI-suppressed shield has been tested using several standard radioactive sources. summing characteristics, hit patterns and absolute efficiency were measured in both crystal modes. Peak-to-total ratios 57.3% 45.6% suppressed mode have determined for 137Cs 60Co sources, respectively. A Geant4 simulation the detector, including segmentation germanium crystals, created, results agreed very well with experimental data.