A model for determining the permeability of fractural porous media based on the double percolation model is presented. The results are close to that by fractural permeability tensor model. The non-uniformity of the permeability and the pore pressure are investigated by parameter study. It is shown that rocks could be divided into "pore-controlling" permeability and "fracture-controlling" permeability according to the fracture length. This model can not only account for the effects of pores and fractures together, but also deal with simulation of fracture network in large scale fast and simply.
In this paper, the technology of embedding the audio signal based on chaotic encryption is researched. A short audio watermark encrypted by a chaotic sequence can be embedded in the original signal wavelet domain in the algorithm. The watermark is encrypted firstly with the chaos method, and makes the position of the watermark with another chaotic sequence. The watermark has dual security and realizes blind extraction. The experimental results show that there is of high security and robustness by using chaos sequence to audio information hiding
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