For both gastric and intestinal phases, the bioaccessibility of Pb in fresh sample was significantly higher than that in dry sample (p<0.

Results and Conclusion\ The number of beams is increasing in geometric series when the light propagates in the two layer system, and it is necessary for study of the interference pattern of the system and for further .

Young’s two slits interference of discrete double light source is numerically simulated,and the curve of visibility, curve of light distribution and interference pattern are solved with different type of line and line width.

Young experiment of discrete double-lined spectrum is simulated by the way of Matlab in order to study how the type or width affects interference pattern.

Thus, useful DFH signals, similar interference signals and dissimilar interference signals can be recognized when comparing their energy in frequency domain among the new rep.

Discussion on the influence of additional optical path difference to interference fringe figure when using Michelson interferometer;

The new method uses incoherent sampling,and adopts the window-added and interpolated measurements based on the standard fast discrete Fourier transform to reduce spectral leakage and to improve evaluation precision, and can reduce as greatly as possible the difficulties and cost in constructing the evaluation system.