The affecting factor analysis of propagation time of peak flood in downstream of the Yellow River;

under the condition of identical source sensor location,testing stress wave propagation time-goal sensor location curve,respectively in the hole sample and the intact.

Nondestructive pressure measurement based on surface wave usually requests accurate measurement of propagation time of surface wave in the medium.

The effect is obviously different with the different sowing time of Pinus tabulaeformis.

Using the perpendicular experiments of four factors and three levels,the research investigated sowing time,size of seed potato,planting density,and growth regulate measures influences on yield and quality of potato with the potato new variety of Minshu 1.

Under the same soil method,seed treatment,sowing method,seedling management and pest control measure,the effect of mulch and sowing time on seedling\'s emergence of Pinus bungeana was studied.

In this paper, using of graph theory and by analyzing graph s connected degree, we find a way to obtain one bound of broadcasting-time for single information.

Using of graph theory to study the problem of relation for connected degree and broadcasting-time in networks, obtain a bound of broadcasting-time for single information and some sufficiency terms of minimum broadcasting-time networks, and construct an effective broadcasting scheme.