L-band electromagnetic scattering from two-dimensional random rough sea surfaces are calculated by first- and second-order Small-Slope Approximation (SSA1, 2) methods. Both analytical and numerical computations are utilized to calculate incoherent normalized radar cross-section (NRCS) in mono- and bi-static cases. For evaluating inverse Fourier transform, inverse fast Fourier transform (IFFT) i...

Classic speech spectrogram shows log-magnitude amplitude (dB) versus time and frequency. The sound pressure level in dB is approximately proportional to the volume perceived by the ear. The classic speech sonagram offers a single integration time which is the length of the window. It implements a uniform bandpass filter, the spectral samples are regularly spaced and correspond to equal bandwidt...

30epartment of Biophysical Chemistry, University of Groningen, Nijenborgh 4 9747 AG, Groningen, The Netherlands A principal component analysis has been applied on equilibrium simulations of a p-heptapeptide that shows reversibIe folding in a methanol solution. The analysis shows that the configurational space contains only three dense sub-states. These states of relatively low tree energy corre...

Clusters of Microcalcifications and masses are the signs of breast cancer. They have different shapes and sizes. Globally, clusters and masses have different frequency characteristics. Due to small size of microcalcifications and high intensity of them with compared to their neighbour pixels, microcalcifications correspond to highfrequency components of the image spectrum. On the other hand, ma...

The often-discomforting percept of unfamiliarity of one’s own voice when heard as a pre-recorded analog or digital signal has received limited attention in perception research. In this paper a digital filter that simulates internal hearing is studied in terms of self-perception of singing by a trained female singer. The processed sound is evaluated to determine the proximity of match to the sou...

A principal component analysis has been applied on equilibrium simulations of a beta-heptapeptide that shows reversible folding in a methanol solution. The analysis shows that the configurational space contains only three dense sub-states. These states of relatively low free energy correspond to the "native" left-handed helix, a partly helical intermediate, and a hairpin-like structure. The col...

[1] A series of flume experiments were conducted to study the effect of bed form dynamics on the flow over a gravel bed comprising a wide distribution of grain sizes. Instantaneous high‐frequency streamwise flow velocities were sampled using an acoustic Doppler velocimeter at a frequency of 200 Hz, while the simultaneous bed elevations were sampled using sonar transducers at a frequency of 0.2 ...

Relative intensity noise spectra of weakly index guided VCSELs in a multi{transverse mode regime are analyzed by using a model that takes into account all the transverse modes supported by the waveguide. Several resonance peaks are obtained in the noise spectra that correspond to the relaxation oscillation frequencies of the transverse modes. In is shown that for low spatially overlapping trans...