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The main constructing methods of metro tunnel include shield tunneling method (TBM) and mining method. The quality of the tunnel constructed by mining method is less stable than by TBM. Various faults may occur during the construction. The tunnel should be inspected by reliable inspecting methods. The inspecting practices in Shenzhen metro indicate that ground penetrating radar (GPR) can be used to...
With the increasing security requirements, authorization constraints must be fulfilled by the assigned roles of the workflow tasks. So the assigned role plan of workflow task sequence was proposed. First, the solution space of the assigned role plan was discussed. Then based on back-track searching, an assigned role plan algorithm was proposed aimed at that current assigned role plan algorithm had...
A temperature window for the synthesis of single-walled carbon nanotubes by catalytic chemical vapor deposition of CH4 over Mo2-Fe10/MgO catalyst has been studied by Raman spectroscopy. The results showed that when the temperature is lower than 750 °C, there were few SWCNTs formed, and when the temperature is higher than 950 °C, mass amorphous carbons were formed in the SWCNTs bundles due to the self-decomposition...
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