Block experiments have been conducted on the physical models which have heterogeneity of Daqing oil field, the experimenial results show that both curing time of sealer and permeability of rock will affect blockage depth of abandoned well treatment, and curing time of four to ten hours applying epoxy resin ball sealer is suitable for Daqing oil field.

Two watermarking algorithms are proposed here: spread spectrum watermarking for color image based on wavelet tree structure and a blind watermarking with strong robustness based on relationship and quantization.

The minimum Steiner tree problem is one of the NP-hard problems, which has extensive applications in many real-world problem,such as communications network.

In this algorithm,used directed diffusion(DD)to deliver interest,and used MMAS algorithm to construct a minimum Steiner tree.

This paper analyses the theoretical basis and realization methods of relational database systems and keyword search technology, proposes content-based similarity calculate method and Minimum Steiner tree based AST query algorithm.

A new real-time reconfiguration approach for large-scale distribution system, based on the minimum spanning tree algorithm and the switch exchange method, is presented.