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Nonlinear optical phenomena on rough self-affine metal surfaces are theoretically studied. Placing nonlin-early polarizable molecules on such surfaces results in strong enhancement of optical nonlinearities. A quasi-static approximation is used to calculate local-enhancement factors for the second and third harmonic generation , degenerate four-wave mixing,(More)
Surface-enhanced Raman scattering (SERS) from a self-affine surface is shown to be very large. A theory is developed expressing this SERS in terms of the eigenmodes of a self-affine surface; the theory successfully explains the observed SERS from cold-deposited thin films that are known to have a self-affine structure. Spatial distributions of local fields(More)
Distributions of the largest fragment charge, Zmax, in multifragmentation reactions around the Fermi energy can be decomposed into a sum of a Gaussian and a Gumbel distribution, whereas at much higher or lower energies one or the other distribution is asymptotically dominant. We demonstrate the same generic behavior for the largest cluster size in critical(More)
We have performed molecular dynamics simulations of an intruder in a vibrated granular bed including interstitial fluid effects to account for the phenomenon of reverse buoyancy. We show that our model is able to reproduce the overall behaviour observed by previous experimental works and is the first finite-elements simulation to show the sinking of(More)
11 since 1954, and certain thermal models predict a large pressure increase at the present epoch 22. Although these are plausible explanations, additional data and more modelling will be needed to fully explain our results. A Vapor pressure and heats of vaporization and sublimation of liquids and solids of interest in cryogenics below 1-atm pressure. A(More)
Preface Professor Ping Sheng, who became one of the protagonists in the physics of random inhomogeneous media, told me once that, when he started research in this field thirty years ago, his senior colleagues tried to discourage him from studying " dirty " materials and suggested he focused on traditional " nice " solids, such as crystals. Nowadays, it has(More)
A method to couple interparticle contact models with Stokesian dynamics (SD) is introduced to simulate colloidal aggregates under flow conditions. The contact model mimics both the elastic and plastic behavior of the cohesive connections between particles within clusters. Owing to this, clusters can maintain their structures under low stress while(More)
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