Then look closely at 20 century with this as reference system The Golden Lotus the four basic features of propagation: Crowd and the diversification of propagation medium on the propagation time and limitation accepted on breaking times and propagation space in propagation thought pattern and the region of isolation the resistance in simplification and propagation practice channel is complex, the dominance on propagation content derives tendency and the recessiveness psychological demand of crowd.

According to the position of extreme value point of laser intensity on the axis, the formula used to divide the propagation space of output beam from unstable resonator into near field, middle field and far field is derived.

Different from conventional methods, the maximum module in propagation space is also limited in order to gilarantee the stability of wave field extrapolation in deeper area.

Yee's space grid model to separate the propagation space of GPR, establish the two dimensional spatial time-domain finite-difference mathematics model, and deduce the GPR forward simulation equation.

Video news dissemination was impacted hugely by the development of Internet technology. Combining Internet technology and traditional TV media, the propagation space of video news will be expanded.

One of the most important results of our paper is that the propagation space equations are no longer partial differential equations but they are in terms of pseudo-differential operators.

We have first derived the propagation space equations in the long wave limit and also given a general procedure to derive these equations for arbitrary wave length, when the flow is irrotational.

Finally, typical nonlocality is introduced for nonlinear Rayleigh surface waves, and general comments on more general two-dimensional (in propagation space) nonlinear strain waves on structures are evoked by way of conclusion.

We identify the key parameters that characterize the dimensions of the signal spaces and the degrees of freedom in the propagation space.

The overall MIMO channel is determined by the interaction between the signal spaces and the propagation space.

The spatial propagation properties of output annular laser beam from an unstable resonator are studied based on Fresnel diffraction integral. According to the position of extreme value point of laser intensity on the axis, the formula used to divide the propagation space of output beam from unstable resonator into near field, middle field and far field is derived. The numerical calculation shows the variation process of output laser beam of unstable resonator from annular pattern on near field, with gradual...

The spatial propagation properties of output annular laser beam from an unstable resonator are studied based on Fresnel diffraction integral. According to the position of extreme value point of laser intensity on the axis, the formula used to divide the propagation space of output beam from unstable resonator into near field, middle field and far field is derived. The numerical calculation shows the variation process of output laser beam of unstable resonator from annular pattern on near field, with gradual transition of laser energy in the annular region to the beam's center, to Airy disk pattern on far field. The experimental results obtained in TEA pulsed CO2 laser with unstable resonator are in good agreement with theoretical results.

The resonant frequencies of the NBS TEM cell have been calculated by the Finite-Difference Time-Domain (FD-TD) and irregularly graded Ttansmis-sion-Line Matrix(TLM) methods. In the calculating process by the FD-TD method a novel processing method for the magnetic wall boundary conditions is developed with which it is possible to treat only one eighth of the whole cell domain to calculate the resonant frequencies. As a result, additional useful resonant frequency data are listed. In the TLM meth ,d, the propagation...

The resonant frequencies of the NBS TEM cell have been calculated by the Finite-Difference Time-Domain (FD-TD) and irregularly graded Ttansmis-sion-Line Matrix(TLM) methods. In the calculating process by the FD-TD method a novel processing method for the magnetic wall boundary conditions is developed with which it is possible to treat only one eighth of the whole cell domain to calculate the resonant frequencies. As a result, additional useful resonant frequency data are listed. In the TLM meth ,d, the propagation space of the TEM cell is irregularly graded according to the nature of it. The results show that the coarseness error is reduced. Finally, a comparison between the results of two methods is given, which shows good agreement with each other.

According to a study on the explicit difference method of 3CDD wave equation and an introduction of a weighting factor used in linearized processing of stable constraint whose module is less than 1,the authors proposed a designing method about 1D explicit short operator based on quadratic programming. Different from conventional methods, the maximum module in propagation space is also limited in order to gilarantee the stability of wave field extrapolation in deeper area. At the same time, a (3D) wave...

According to a study on the explicit difference method of 3CDD wave equation and an introduction of a weighting factor used in linearized processing of stable constraint whose module is less than 1,the authors proposed a designing method about 1D explicit short operator based on quadratic programming. Different from conventional methods, the maximum module in propagation space is also limited in order to gilarantee the stability of wave field extrapolation in deeper area. At the same time, a (3D) wave field extrapolation method in depth given based on 1D explicit operator and McClellan transform can lower computing amount and increase calcuation velocity, it can also adapt to transverse inhomogeneous media.