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The bootstrap current in small rotating magnetic islands
Posted on September 25th, 2009 No commentsA. Bergmann, E. Poli, and A. G. Peeters<br/> The bootstrap current in small magnetic islands of neoclassical tearing modes is studied with guiding center particle simulations including pitch angle scattering. A model for a rotating island and its electric field is used and a new approximation to the electric potential in small islands is deriv … [Phys. Plasmas 16, 092507 (2009)] published Thu Sep 24, 2009.
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Plasma physics in noninertial frames
Posted on September 25th, 2009 No commentsA. Thyagaraja and K. G. McClements<br/> Equations describing the nonrelativistic motion of a charged particle in an arbitrary noninertial reference frame are derived from the relativistically invariant form of the particle action. It is shown that the equations of motion can be written in the same form in inertial and noninertial frames, … [Phys. Plasmas 16, 092506 (2009)] published Thu Sep 24, 2009.
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Weibel instabilities in a completely degenerate electron Fermi gas
Posted on September 25th, 2009 No commentsLevan N. Tsintsadze<br/> Weibel instability in a degenerate Fermi plasma is studied. A new type of quantum Weibel instabilities is disclosed. In particular, a novel oscillatory Weibel instability is found and its growth rate is obtained. A transverse zero sound in a quantum degenerate electron gas, which has no counterpart … [Phys. Plasmas 16, 094507 (2009)] published Thu Sep 24, 2009.
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Excitation frequency dependent mode manipulation in radio-frequency atmospheric argon glow discharges
Posted on September 25th, 2009 No commentsJie Zhang, Ke Ding, Kaya Wei, Jing Zhang, and Jianjun Shi<br/> An experimental investigation is presented to characterize the dependence of discharge operation modes (alpha and gamma modes) and their transition on excitation frequency in radio-frequency atmospheric argon glow discharges. The current-voltage characteristics are used to distinguish the alpha and … [Phys. Plasmas 16, 090702 (2009)] published Thu Sep 24, 2009.
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Fluidic electrodynamics: Approach to electromagnetic propulsion
Posted on September 25th, 2009 No commentsAlexandre A. Martins and Mario J. Pinheiro<br/> We report on a new methodological approach to electrodynamics based on a fluidic viewpoint. We develop a systematic approach establishing analogies between physical magnitudes and isomorphism (structure-preserving mappings) between systems of equations. This methodological approach allows us to give … [Phys. Fluids 21, 097103 (2009)] published Thu Sep 24, 2009.
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Fluctuations and stratification in sedimentation of dilute suspensions of spheres
Posted on September 25th, 2009 No commentsDaniel Chehata Gomez, Laurence Bergougnoux, Elisabeth Guazzelli, and John Hinch<br/> We have tested in experiments and simulations whether stratification can control velocity fluctuations in suspensions of sedimenting spheres. The initial value and early decay of the velocity fluctuations are not affected by stratification. On the other hand, in the descending front where the strati … [Phys. Fluids 21, 093304 (2009)] published Thu Sep 24, 2009.
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Correlation functions of integrable models: A description of the ABACUS algorithm
Posted on September 25th, 2009 No commentsJean-Sebastien Caux<br/> Recent developments in the theory of integrable models have provided the means of calculating dynamical correlation functions of some important observables in systems such as Heisenberg spin chains and one-dimensional atomic gases. This article explicitly describes how such calculations are generall … [J. Math. Phys. 50, 095214 (2009)] published Thu Sep 24, 2009.
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Temperature dependence and screening models in quantum cascade structures
Posted on September 25th, 2009 No commentsRikard Nelander and Andreas Wacker<br/> Different screening models in quantum cascade lasers are compared by calculating the contribution of intrasubband impurity scattering to the optical linewidth as a function of temperature. We find a strong impact of impurity scattering, which increases substantially with temperature. A simple isotro … [J. Appl. Phys. 106, 063115 (2009)] published Thu Sep 24, 2009.
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Determination of the pressure dependent melting temperatures of Al and Ni using molecular dynamics
Posted on September 25th, 2009 No commentsN. Scott Weingarten, William D. Mattson, and Betsy M. Rice<br/> We present the results of a molecular dynamics simulation study designed to calculate the melting temperatures of pure nickel and pure aluminum at various system pressures using an embedded atom method type potential. The melting points are determined using a two-phase coexistence method, where the … [J. Appl. Phys. 106, 063524 (2009)] published Thu Sep 24, 2009.
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Fixed photorefractive holograms with maximum index-of-refraction modulation in LiNbO:Fe
Posted on September 25th, 2009 No commentsVladimir A. Jerez, Ivan de Oliveira, and Jaime Frejlich<br/> We report the recording of a fixed good quality transmission hologram in LiNbO:Fe with maximum index-of-refraction modulation using the simultaneous recording/compensation process at 120 degrees C in a specially designed setup with lambda=514.5 nm. This process was shown to be reproducible and in … [J. Appl. Phys. 106, 063116 (2009)] published Thu Sep 24, 2009.