A novel image blind watermarking scheme based on Contourlet transform was proposed to embed color watermark image into color host image,which was different from
Effect of sludge retention time( SRT) on the removal of potential and polysaccharides in an anaerobic / anoxic / aerobic( AAO) process was investigated. The Low
Due to bad working conditions and complicated structure,kinds of complicated cycle loads work on turbine disc, and it’s difficult to determine the stress distr