3,397 research outputs found
Nonlinear Kinetic Dynamics of Magnetized Weibel Instability
Kinetic numerical simulations of the evolution of the Weibel instability
during the full nonlinear regime are presented. The formation of strong
distortions in the electron distribution function resulting in formation of
strong peaks in it and their influence on the resulting electrostatic waves are
shown.Comment: 6 pages, 4 figure
Covariant form of the ideal magnetohydrodynamic "connection theorem" in a relativistic plasma
The magnetic connection theorem of ideal Magnetohydrodynamics by Newcomb
[Newcomb W.A., Ann. Phys., 3, 347 (1958)] and its covariant formulation are
rederived and reinterpreted in terms of a "time resetting" projection that
accounts for the loss of simultaneity in different reference frames between
spatially separated events.Comment: 3 pages- 0 figures EPL, accepted in pres
Particle acceleration and radiation friction effects in the filamentation instability of pair plasmas
The evolution of the filamentation instability produced by two
counter-streaming pair plasmas is studied with particle-in-cell (PIC)
simulations in both one (1D) and two (2D) spatial dimensions. Radiation
friction effects on particles are taken into account. After an exponential
growth of both the magnetic field and the current density, a nonlinear
quasi-stationary phase sets up characterized by filaments of opposite currents.
During the nonlinear stage, a strong broadening of the particle energy spectrum
occurs accompanied by the formation of a peak at twice their initial energy. A
simple theory of the peak formation is presented. The presence of radiative
losses does not change the dynamics of the instability but affects the
structure of the particle spectra.Comment: 8 pages, 8 figures, submitted to MNRA
Parceria entre Embrapa Clima Temperado e Faculdade de Medicina Veterinária da UFPel obtém os primeiros embriões suínos viáveis pelo sistema de produção in vitro.
bitstream/item/58343/1/31-embrioes-Ligia.pd
Indagini sulle cellule e sui cromosomi di leucemia umana. Attività di ricerca svolta nel periodo 1962-1965 Relazione finale. EUR 2764. = Investigations on human leukemia cells and chromosomes. Research activities carried out during the period 1962-1965 Final report. EUR 2764.
Nonlinear kinetic development of the Weibel instability and the generation of electrostatic coherent structures
The nonlinear evolution of the Weibel instability driven by the anisotropy of the electron distribution function in a collisionless plasma is investigated in a spatially one-dimensional configuration with a Vlasov code in a two-dimensional velocity space. It is found that the electromagnetic fields generated by this instability cause a strong deformation of the electron distribution function in phase space, corresponding to highly filamented magnetic vortices. Eventually, these deformations lead to the generation of short wavelength Langmuir modes that form highly localized electrostatic structures corresponding to jumps of the electrostatic potential
Reciclagem em inseminação artificial de bovinos.
bitstream/CPACT-2009-09/12053/1/documento_246.pd
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