The critical overlap concentration (C) and the critical entanglement concentration C_B of linear polystyrene (LPS) and branched polystyeene (BPS) have been disseussedThe values of C and C_E were calculated according to the Graessley and Klein equation C=0.

The networks are divided into a number of overlapping clusters and produce gateway nodes,using connected dominating set theory to optimize with the topology structure of networks,selecting the gateway nodes with higher energy to be new dominating nodes,the network load and energy consumption are balanced,coming to the purpose of extending the life time of networks.

Introduction one kind of non woven technology, unidirection fiber layer machine, continiou crossply and laminated technology and equipments.

On the basis of the shear_lag theory,this paper studies the microstress redistributions induced by the interaction of failure of 90° layers and the breakage of some fibers in 0° layer in cross_ply laminates under tension in 0° direction.

The overlapped tunnels amount to 437.

Based on an engineering,this article expounds the construction technology of a cross and repeated tunnel and the construction measure,and frames availability of construction measure.