A new method based on trie wavelet analysis of trie voltage oscillations generated above threshold electric field for depmning of trie charge density wave (CDW) in trie molecular conductor (Perylene)2Pt(mnt)2 (mnt = maleomtriledithiolate) bas been developed. This analysis method permits a better time resolution of trie frequencies and phases involved in trie CDW motion than that allowed by conventional Fourier analysis. Trie results are discussed in relation with current models for CDW deformations.l.
The Wigner distribution function is investigated as a signal processing tool to detect subsurface targets closely located beneath a randomly rough surface. Information provided by a bistatic arrangement of sources and detectors can be used to discriminate target and surface response based on their scattering behavior. It is shown that the bilinearity of the Wigner distribution function can be exploited for nonlinear amplification of the target response. This is achieved by averaging the Wigner distribution of the detected signal for different source locations. Target detection is further improved by numerically backpropagating the detected signal to the surface. A statistical evaluation based on simulated data sets is used to evaluate the performance of the detection method.
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