The ray theory of geometric optics was applied to visually investigate the propagation of quasi stationary waves in time mean basic flow and interpret the zonal nonhomogeneity.

The studies of the dynamic processes and mechanism of East Asian monsoon system(EAMS) variability and anomaly,especially on the relation of the interannual and interdecadal variabilities and anomalies of EAMS to quasi-stationary planetary wave activities,are systematically reviewed.

There is evidence showing that the troposphere-stratosphere coupling interaction is closely associated with the quasi-stationary planetary wave activity.

There is evidence that the troposphere-stratosphere coupling interaction is closely associated with the quasi-stationary planetary wave activity.

Both observations and simulations indicate that in the Northern Hemisphere winter there are two waveguides for the meridional propagation of quasi-stationary planetary waves.

Then the impacts of tropical QBO on the zonal mean circulation and the propagation of quasi-stationary planetary waves in the middle and high latitudes of.

Put forward a new method for long-span bridge buffeting analysis which using quasi-steady aerodynamic stiffness and unsteady aerodynamic damping based directly on wind tunnel test.

Numerical simulations on the quasi-steady and unsteady flow in Aachen 1-1/2 Axial-Flow turbine stages are performed in this paper, and the influences of the rotor-stator interaction on the fluctuating velocity, flow angle, wall-pressure and loss mechanism are discussed.