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171.
172.
Z. Bo D. Loggia L. Xiaorong G. Vasseur H. Ping 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,50(4):631-637
Two dimensional simulations of percolation are
realized on square networks of pore throats with a random
capillary pressure distribution. We analyse the influence of a
destabilizing gravity field (g) and of the
standard deviation of the distribution of the capillary pressure thresholds
(Wt). The fragmentation process is not taken into account in this study.
For an increase of g or/and when Wt decreases, two
transitions are analyzed with three different regimes
displacement patterns: Invasion percolation, invasion
percolation in a gradient, and invasion in a pure
gradient. The transitions are controlled both by the ratio
g/Wt and by the sample size (L). A scaling law between the
saturation at the percolation threshold and g/Wt
allows delineating the three regimes in agreement with
theoretical argument of the percolation in a gradient. 相似文献
173.
Irini S. Reljin Milka L. Avramov-Ivi? Goran I. Plavec Gordana M. Bogdanovi? 《Physica A》2008,387(14):3563-3573
Multifractal (MF) approach was applied for the analysis of ultraviolet/visible (UV/VIS) spectra as an independent confirmation of the diagnostic efficacy of UV/VIS spectral analysis of intraperitoneal fluids, ascites, taken from patients with a known clinical diagnosis. Recently, it was reported that from UV/VIS spectra differentiation of malignant from benign ascites is possible. Here, it was shown that by using MF analysis of UV/VIS spectra, the objective classification of UV/VIS spectra is possible. The applicability of UV/VIS analysis and MF classification of spectra were evaluated on N=68 cases, of which M=64 and B=4 were clinically confirmed as malignant and benign, respectively. The overall diagnostic efficacy was 89.71% when using on-line analysis of UV/VIS spectra (61 out of 68 samples were positively recognized: 58 malignant and 3 benign), and even 95.59% by using off-line MF classsification (65 out of 68 samples were classified correctly: 63 malignant and 2 benign). It can be inferred that UV/VIS spectral analysis of ascites, combined with MF analysis, could be suggested as a successful and safe screening method in the evaluation of intraperitoneal fluids. 相似文献