Monthly Archives: September 2014

Kinetic theory molecular dynamics and hot dense matter: Theoretical foundations

Author(s): F. R. Graziani, J. D. Bauer, and M. S. Murillo

Electrons are weakly coupled in hot, dense matter that is created in high-energy-density experiments. They are also mildly quantum mechanical and the ions associated with them are classical and may be strongly coupled. In addition, the dynamical evolution of plasmas under these hot, dense matter con...

[Phys. Rev. E 90, 033104] Published Wed Sep 03, 2014

Head-on collision of dust-acoustic shock waves in strongly coupled dusty plasmas

A theoretical investigation is carried out to study the propagation and the head-on collision of dust-acoustic (DA) shock waves in a strongly coupled dusty plasma consisting of negative dust fluid, Maxwellian distributed electrons and ions. Applying the extended Poincaré–Lighthill–Kuo method, a couple of Korteweg–deVries–Burgers equations for describing DA shock waves are derived. This study is a first attempt to deduce the analytical phase shifts of DA shock waves after collision. The impacts of physical parameters such as the kinematic viscosity, the unperturbed electron-to-dust density ratio, parameter determining the effect of polarization force, the ion-to-electron temperature ratio, and the effective dust temperature-to-ion temperature ratio on the structure and the collision of DA shock waves are examined. In addition, the results reveal the increase of the strength and the steepness of DA shock waves as the above mentioned parameters increase, which in turn leads to the increase of the phase shifts of DA shock waves after collision. The present model may be useful to describe the structure and the collision of DA shock waves in space and laboratory dusty plasmas.

Effective potential and interdiffusion in binary ionic mixtures

Author(s): M. V. Beznogov and D. G. Yakovlev

We calculate interdiffusion coefficients in a two-component, weakly or strongly coupled ion plasma (gas or liquid, composed of two ion species immersed into a neutralizing electron background). We use an effective potential method proposed recently by Baalrud and Daligaut [Phys. Rev. Lett. 110, 2350...

[Phys. Rev. E 90, 033102] Published Tue Sep 02, 2014

Measurement of net electric charge and dipole moment of dust aggregates in a complex plasma

Author(s): Razieh Yousefi, Allen B. Davis, Jorge Carmona-Reyes, Lorin S. Matthews, and Truell W. Hyde

Understanding the agglomeration of dust particles in complex plasmas requires knowledge of basic properties such as the net electrostatic charge and dipole moment of the dust. In this study, dust aggregates are formed from gold-coated mono-disperse spherical melamine-formaldehyde monomers in a radio...

[Phys. Rev. E 90, 033101] Published Tue Sep 02, 2014

Dynamical mechanism in meteorological factors using detrended cross-correlation analysis

Abstract We simulate and analyze the temporal dependence of fine dust particle with sizes less than 10 microns, denoted as PM10, on influencing factors such as temperature, humidity, and wind velocity in eight South Korean cities. We employ the detrended cross-correlation analysis method to extract the overall tendencies of the hourly variations of those dependences. The relationships between PM10 and the meteorological factors are established by using the cross-correlation coefficients. Particularly, we ascertain from a specific interval 3≤ n ≤168 of the hourly time series data that a city in Korea, Andong has the largest cross-correlation coefficient while another city in Korea, Busan, has the smallest value in the correlation between the dust density PM10 and the wind velocity. A city in Korea, Donghae has the largest negative value of the cross-correlation coefficient between PM10and the humidity. We find that the cross-correlation is statistically significant for the hourly time intervals n = 12, 24, and 48 for meteorological time series data.