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According to the problems of pipeline leak detection existed in oil transport, a testing and positioning method based on wavelet packet and BP neural network is proposed. A Db4 wavelet packet is used to filter the noises of pressure signals, and extract its energy signals as the input vectors to train the BP neural network, which can be used to identify the pipeline's working state and accurately...
Industry is an important pillar of Hangzhou's economy, but the recent industrial economy of Hangzhou has undergone a greater volatility by the impact of international financial crisis. This study based on the status quo of the development of Hangzhou's industrial economy during the financial crisis, deeply analyzed the main reasons which affect the development of Hangzhou's industrial economy, than...
A method for constructing effective Hamiltonians using the information contained in the ground state reduced single-electron density matrices for many-electron systems is proposed and applied to trans-polyacetylene oligomers C 2n H 2n+2 with n = 4-24. The resulting effective Hamiltonians for π electrons, expanded in the basis set of natural atomic orbitals...
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