The linear spectral unmixture algorithm was adopted to calculate the fractional abundance of ground cover,from which the potential soil loss ratio(PSLR) was estimated.

Two calculational methods for analyzing the spectrum which measured by indoor low background multi-channels gamma-rays spectometer(Na(Tl)) to get the specific activity of 226Ra, 232Th and 40K of the sample are discussed, they are the spectrum analysis method and the characteristic energy peak method(inverse matrix method) respectively.

Two fluorimetric methods,excitation-emission fluorescence spectra combined with alternating trilinear decomposition algorithm and derivative matrix isopotential synchronous fluorescence spectrometry,were developed for the rapid and simultaneous determination of zinc protoporphyrin IX(ZnPP)and protoporphyrin IX(PP)extracted from blood with dimethylformamide(DMF).

The measure principles and optical paths of multi-line spectrum analysis,multi-channel radiation pyrometer,and laser speckle photography were introduced.

In this paper,the methodologies of combining excitation-emission fluorescent spectra with second-order calibration based on both the alternating trilinear decomposition(ATLD)algorithms and the parallel factor analysis(PARAFAC)algorithms were applied to directly determine salicy late acid(SA)in plasma even in the presence of other uncalibrated interferents.