Two different ways are used to stabilize the numerical oscillations in predicting the mean pressures on large-span roofs: artificial viscosity techniques and low-order upwind scheme.

In order to improve the numerical simulation of an underwater blast wave, some parameters which have effect on the simulation, such as equation of state(EOS), element density and artificial viscosity, were analyzed.

In this scheme, through a proper modification of the additional terms, relative to the general Galerkin FEM formulation which was generated from the transformation of high order temporal derivatives in the Taylor expansion of the first order time derivatives to spatial derivates, the real effect of artificial viscosity is introduced.

Practice and discussion of growth of the coal-skilled workers

The shortage of skilled workers has already affected the development of some enterprises in China and the morbidity of the value-cultivation-mechanism of skilled workers is one of the key reasons.

On how to improve the training of oilfield skilled worker;

The growing story of the skilled workers proved that their growth is influenced by both the vocational high school and the factory.

It is of great importance to integrate the skilled worker resources for capital construction.

Short of technical workers is one of the reasons which affect our country s economy develop by a higher speed.

The incisive contradictory between supply and demand of the technical workers becomes the important barrier which our country economy continues to grow.

However, presently, our labour market is severely deficient in senior technical workers.