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In this work finite element models at different length scales are applied to predict the performance of three different crossing materials (Manganese steel, Hardox and Marage 300) in view of the development of rolling contact fatigue (RCF) cracks. A model of the whole crossing (crossing model) is used for the calculation of the dynamic forces and movements of wheel and crossing. For the prediction...
This paper proposes a simple dynamic threshold based method to detect abrupt scene changes for the coding of a video sequence. The detected frames are then encoded as keyframes aiming at improving the coding efficiency of the video sequence. The proposed detection method first replies on the number of INTRA macroblocks that are available during encoding process. The dynamic threshold, which is updated...
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