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Synchrotron radiation white beam x-ray microdiffraction was employed to study grain size and orientation of fine pitch Sn2.5Ag micro-bumps. The indexing of the Laue patterns shows that there is mostly one dominant grain orientation in each micro-bump. Moreover, a statistics study based on the characterization of 72 micro-bumps, shows that the [001] direction, which is the fast diffusion path for Ni/Cu...
Time series classification based on wavelet transforms and Fourier transform is discussed in this paper. Wavelet transforms have the time-variant characteristic, and are relatively sensitive to the time series with some mutations. Fourier transform is able to reflect various periodic variation of time series clearly. The test proves that the hierarchical clustering based on wavelet transforms can...
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