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Fractal patterns of fluid domains for displacement processes in porous media (1988)

Laidlaw, W. G. ; Hamilton, G. R. ; Flewwelling, R. B. ; [et al.]

Springer

Journal of statistical physics 53 (1988), S. 713-731

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ISSN: 1572-9613

Keywords: Percolation ; fractal ; porous ; oil recovery ; reservoir flooding

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Percolation invasion displacement of a compressible defender is examined for two cases: when only the smallest accessible site is entered at each step and when all accessible sites less than the size given by a reducing back pressure are entered at each time step. Although the fractions of invading fluid are different, their scaling properties are equivalent. The effect of limited control of a back pressure in a real displacement and the effect of viscosity in a real time displacement are examined. In these cases the scaling properties of a percolation process at breakthrough are removed. As a result, one should expect that realistic displacement models will not have the singular properties usually attributed to percolation processes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01014222

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Hartree Fock instabilities of sulfur-nitrogen ring systems: S2N2Presented at the Symposium on Computation and Mathematical Chemistry, Saskatoon, Canada, June 1-4, 1986 (1987)

Laidlaw, W. G. ; Bénard, M.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Computational Chemistry 8 (1987), S. 727-735

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ISSN: 0192-8651

Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Computer Science

Notes: The Hartree-Fock instablities of S2N2 are reported and compared with those of S3N3- and S4N42+. These unsaturated sulfur nitrogen planar rings are π electron rich and although the symmetry adapted HF solutions are singlet stable at the experimental bond lengths they become unstable with only a very modest increase in bond length. The broken symmetry solutions for S2N3, S3N3-, and S4N42+ are of planar C2v type with one of the nitrogens stripped of its π electrons, producing a π hole.

Additional Material: 13 Ill.