A rapid and intact method was developed for discriminating plastics tips by the analysis of 1/f fluctuation of near-infrared reflection spectra. First, the regression lines of the power spectrum of a given sample are obtained after middle pass filtering with FFT. Then the data point of the cross section and slope of the obtained regression line are plotted. According to our test measurement, eighteen samples were clearly classified into five groups of different chemical compositions. This novel method was found to be useful for recycling plastics waste efficiently and with reasonable accuracy.

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A rapid and intact method was developed for discriminating plastics tips by the analysis of 1/f fluctuation of near-infrared reflection spectra. First, the regression lines of the power spectrum of a given sample are obtained after middle pass filtering with FFT. Then the data point of the cross section and slope of the obtained regression line are plotted. According to our test measurement, five black colored samples were clearly classified into five groups of different chemical compositions. This novel method was found to be useful for recycling plastics waste efficiently and with reasonable accuracy.

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The applicability of noise filtering methods, FFT, Bayesian model and trend model was evaluated using multiple nonstationary frequencies of noise and electrocardiogram with large signal-to-noise ratio. The results show that the Bayesian model is the most applicable to filtering of multiple nonstationary frequencies with large noise. In the case the best way for filtering out the noise in electrocardiogram suggested that the background rolling noise should be eliminated by FFT after removing the high frequency component by Bayesian or trend model.

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A software called “QTVR ( QuickTime Virtual Reality ) Authoring Studio" was used to represent hydrogen atomic orbitals. Digital still images of the contour surfaces of the orbitals were created using computer graphic techniques. Horizontal 360-degree and vertical 90-degree views were combined to video images frame by frame to give a QTVR object movie. The users are allowed to view the object hydrogen atomic orbital from all sides, giving fully interactive animation as if it was in their hands.

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