Spectral filtering methods

The spectral distribution of the emitted light has been determined by a wavelength filter method. Ashby (136) found that the PMT anode current was attenuated about 50% by interposing a filter that absorbed light of the wavelengths shorter than 420 nm between the polymer and the PMT. No current could be detected if a filter was interposed that absorbed light of wave-... 

Once the method has been tested for a simple double slit source representing two identical point sources, the next step is to apply this method for different sources. To achieve this, we use again a double slit source but one of the apertures being covered with a low-pass spectral filter (LPF) with cut-off wavenumber at 21 cm, to simulate two different sources in the sky and increase the complexity of the procedure. The new forward modelling method to compute the new source from the single slit data is... 

We complete this section with a listing of other algorithmic developments in real-space electronic structure. As mentioned above, the PARSEC code has incorporated alternative techniques for accelerating the solution of the eigenvalue problem based on Chebyshev-filtered subspace methods, thus circumventing the need for multiscale methods. Jordan and Mazziotti have developed new spectral difference methods for real-space electronic structure that can yield the same accuracies as the FD representation with... 

Quality tests as integral parts of spectral pre-processing have been described in the previous sections. In the following we will therefore focus on pre-processing methods for classification analysis such as normalisation, spectral filtering (de-noising, derivatives) and feature selection. 

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