Biomedical subjects

MS Murillo

Publications and source records attributed to MS Murillo.

3 recordsLinked to original sources

PubMed2000

Critical wave vectors for transverse modes in strongly coupled dusty plasmas

Transverse collective modes of strongly coupled dusty plasmas are studied in the fluid phase. A memory function approach based on the generalized viscosity is employed to capture both the hydrodynamic limit and the second-moment sum rule. It is shown that shear modes do not exist at long wavelengths but do exist above a critical wave vector. Above the critical wave vector strong coupling gives rise to an incipient Brillouin structure in the dispersion. The emergence and damping of the shear mode is shown to depend on the generalized viscosity and a generalized relaxation time. Agreement with simulation data is shown to be excellent.

Journal Article↗

PubMed2000

Empirical bridge function for strongly coupled yukawa systems

A simple bridge function for strongly coupled Yukawa systems is developed based upon a form previously extracted for a one-component plasma [H. Iyetomi, S. Ogata, and S. Ichimaru, Phys. Rev. A 46, 1051 (1992)]. Using the proposed bridge function in the modified hypernetted chain theory, excellent agreement is obtained with molecular dynamics simulations and the compressibility sum rule is satisfied to within a few percent. This result offers a simple and very accurate method to quickly compute correlation functions for Yukawa systems.

Journal Article↗

PubMed2000

Viscosity estimates for strongly coupled yukawa systems

An analytic form for the shear viscosity of a Yukawa system, in terms of the known result for the one-component plasma, is given by establishing an analytic correspondence between the Yukawa and one-component plasma systems. The correspondence is found by ensuring that the Yukawa system and the reference one-component plasma have identical effective hard-sphere packing fractions, as determined by the Gibbs-Bogolyubov inequality. The resulting prediction for the freezing transition is compared with known simulation results. These results are useful for describing dynamical properties of Yukawa systems, and the method can be easily generalized to mixtures.

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