Optimal photoassociation (PA) reactions of He+H⁺→HeH⁺ in electronic ground state, together with relevant multiphoton transition and dissociation processes, are investigated with time-dependent quantum wavepacket method. Level v=6 is set to target state and optimal PA probability of this level is obtained by optimizing laser parameters. It is shown that with increase of initial collision momentum of collision pair optimal laser duration is decreasing, but laser intensity and detuning increasing. Due to resonance multiphoton transition process, other bound levels may be resided after PA process at some collision momenta. In addition, above threshold dissociation increases linearly up to a maximum, then decrease to a saturation value and dominates dissociation processes at relative greater initial collision momentum.

Meso-scale heavy rain numerical model was studied.Regional atmospheric model parallel program with high hierarchy and modularity was built based on parallel applications infrastructure.With simulation of typical weather event, correctness, improvement of parallel performance and high-resolution simulation are tested.The new parallel model kept well prediction performance of original model and improved parallel performance and extendibility.The model simulated better with higher resolution.

Structure stability, magnetism, electronic structure and elastic properties of (Mo,Fe,Mn)₃B₂ are determined with first-principles calculations. Density functional theory and ultrasoft pseudopotentials are used. Antiferromagnetic case has the lowest energy, indicating that it is ground state. DOS and population of (Mo,Mn,Fe)B₂ are similar to those of Mo₂FeB₂. From density of states and overlap populations, it is found that B-B and B-Mo are covalent bonding and they give positive contribution to shear modulus. According to analysis of magnetism, Fe and Mn atoms play the key point. However, Mn doping has weak effect on bonding and elastic properties of hard phase Mo₂FeB₂.

Complex flow with large-scale moving boundaries is divided into a moving boundary zone and a common flow zone connected by a special interior boundary named zone interface. Local remeshing method is applied to deal with grid-reforming of a high-speed bullet. The axis is defined as a special grid-deforming boundary to avoid negative volume of grid near the axis. Arbitrary Lagrangian-Eulerian (ALE) formulation is used to solve unsteady process of a bullet leaving a muzzle. It indicates that the bullet is accelerated and then decelerated gradually.

The structure preservind difference algorithms for soliton equations are investigated. The symplectic structures and multisymplectic structures of the classical solitary wave equations such as the KdV, sine-Gordon and KP equations are presented to illustrate the applicability of the symplectic and multisymplectic algorithms. The concept of local conservative schemes and generalized structure preserving algorithms, which are natural generalizations of the structure preserving algorithms, are also proposed. A new concatenating method to systematically construct local conservative schemes and some numerical experiments of the constructed schemes are also presented.

Based on the model of ideal frontogenesis in two dimensions, two kinds of finite difference scheme is tested. One scheme is a total energy conservation scheme that is used widely in atmosphere simulation, and the other one is an artificial compression method (ACM) that is used to capture the contact discontinuity in high-speed flows. Both of them have great abilities to simulate frontogenesis. But the effect of the ACM is better than the other to some extent.

The Global Positioning System (GPS) ray-shooting method is a self-sufficient observation operator in GPS/MET (Meteorology) data variational assimilation.The huge computation of the GPS ray-shooting method,however,makes it impossible so far to be applied in data assimilation and operational prediction.In order to reduce the huge computation,a 2nd-order timesaving symplectic scheme is used to solve the equations of the GPS ray trajectory due to its separable Hamiltonian nature.Not only does it save 75% of the CPU time the old GPS ray-shooting model using 4th order Runge Kutta method takes,but also does the simulation accuracy be improved slightly to some extent.Then the parallel computing of the new GPS ray shooting model is studied.The speed up and the parallel efficiency are both very high.

The Hamiltonian nature of the dynamic equations of atmosphere is studied further, based on its regular form and its infinitely many first integrals equipped with a given Poisson bracket. Without the friction and forcing processes, the dynamic equation system of atmosphere is proved to be a Hamiltonian system. A symplectic scheme to solve the system is proposed, whose good performance is shown in a numerical experiment.

With the mesoscale model being used as the dynamical frame, and coupled with the cloud model of explicit scheme, a numerical simulation is conducted on the macro parameters of cloud fields, water vapour of cloud and size-distribution of the spectrum of cloud particles, based on which the application of cloud model in aviation is also investigated.

The Singular Spectrum Analysis method,especially on the fundamental property of identifying the oscillatory compo-nents,is described.It is applied to a 30-year surface temperature series of east-southem china with a windows length of 100 days.Two main low-frequency oscillations with period of 35-40day and about 20 days are found to be robust,accounting for about 90% of total variance in the relevant frequency band.

One of important features in the numerical modelling of motions of atmosphere or ocean consists in the long period prediction.A key point in such simulations is to maintain the intrinsic physical features of the original problem and to preveant the distortion due to the accumulation of numerical errors.This paper takes into account the traditional Semi-Lagrangian integration scheme.A scheme is constructed so as to keep the conservation of total energy and enlarge the time step to one decade times.Besides it is an explicit scheme,it avoids complex matrices.Several preliminary numerical tests show good perspective of this scheme.

We present a new method to obtain soliton's numeric solution from the NLS equation, it is a recurrent method. The practice prove it not only gives good soliton's figure simply and fastly but also saves time.

This paper analyses the main cause of the humidity effect in spelaeos, i.e. the mixture of humid air advection. It also points out the effectiveness of using sealing door separation to prevent humidity. In the end, there is a research into the measures of spelaeon antihumidity.