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PHYSICS BY SOKRATES T. PANTELIDES IBM Research Division Thomas J. Watson Research Center Yorktown Heights, N.Y. " The dispersion front of a tracer fluid flowing in a porous medium has a fractal structure. Fractal geometry abounds in nature, but the principles that determine fractal dimension still remain a challenge. This entry appeared in the 6 February 1989 issue of The Scientist with an incorrect reference. [See correct reference below.] K.J. Måløy, J. Feder, F. Boger, T. Jøs

Sokrates Pantelides

PHYSICS

BY SOKRATES T. PANTELIDES
IBM Research Division
Thomas J. Watson Research Center
Yorktown Heights, N.Y.

" The dispersion front of a tracer fluid flowing in a porous medium has a fractal structure. Fractal geometry abounds in nature, but the principles that determine fractal dimension still remain a challenge. This entry appeared in the 6 February 1989 issue of The Scientist with an incorrect reference. [See correct reference below.]

K.J. Måløy, J. Feder, F. Boger, T. Jøssang, “Fractal structure of hydrodynamic dispersion in porous media,” Physical Review Letters, 61,2925-8,26 December 1988.

" Chemical vapor deposition is an important method for growing epitaxial thin films for microelectronics. A new theoretical simulation of the process studies the crossover from diffusion-limited growth to surface kinetic-limited growth and accounts for the morphology at early and intermediate times in tenns of a nonlinear growth model.

G.S. Bales, A.C. Redfield, A. Zangwill, “Growth dynamics...

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