We present a spectral test analysis of full-period subsequences with small step sizes generated by well-known linear congruential pseudorandom number generators. Subsequences may occur in certain simulation problems or as a method to get parallel streams of pseudorandom numbers. Applying the spectral test, it is possible to find bad subsequences with small step sizes for almost all linear pseudorandom number generators currently in use.

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In this paper we present an efficient algorithm for the fully automatic creation of tree ring profiles from CT-images that show the cross-section of a piece of wood. This kind of pattern is needed in wood technology for annual ring feature detection in general and in the field of dendrochronology which concerns itself with the dating of past events through the study of tree ring growth.

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