A damping device for reducing pressure oscillations in a combustion system includes at least a portion provided with a first, outer wall, a second, inner wall, an intermediate plate interposed between the first wall and the second wall. The hematopoietic-inducing environment can be either ex vivo or in vivo. , by scanning a document, and then is subjected to multi-level thresholding to obtain a plurality of binary images representing the original grayscale image.