Browsing by Subject "Condensed Matter Physics"
Now showing items 1-20 of 27
-
(1994)In this work we study the Heisenberg XXZ antiferromagnetic model for spin S and dimension d in the presence of an external longitudinal magnetic field. First, we essay a variational approach which uses as trial function a ...
-
(1995)The linear and nonlinear theory of circularly-polarized Alfvdn and ion-cyclotron waves in multicomponent plasmas is reviewed. It is shown that minor heavy- ion components play an important role in the dispersive properties ...
-
(1992)It is shown that in a current-carrying cylindrical plasma with a free boundary, resistivity and thermal conductivity can lead to large-scale steady convection. Convection can take place for any azimuthal wave number m, ...
-
(1992)The effect of Hall currents on the steady convection of a fully ionized current‐carrying cylindrical plasma column surrounded by perfectly conducting walls is studied. In general, when the Hall term is large, it can affect ...
-
(2005)This paper studies the effect of nonlinear left-hand polarized waves supported by a proton beam on the linear circularly polarized instabilities driven by the same beam. It shows that the nonlinear wave can either stabilize ...
-
(1989)Electromagnetic ion cyclotron waves below the proton gyrofrequency in multicomponent plasmas have been extensively studied in recent years. However, it has recently been suggested that an often used analytical approach ...
-
(1996)We study the stability of the cold-plasma dispersion relation for circularly polarized waves in a plasma composed of an ion background and an ion beam. The presence of the beam introduces a resonant branch into the dispersion ...
-
(1990)We consider electrostatic instabilities in a plasma composed of an ion beam moving in a stationary background of electrons and ions. Analytical expressions for the ion-acoustic and ion-ion acoustic instabilities are ...
-
(Blackwell Publishing Ltd, 2008)Alfvén/ion-cyclotron waves have been observed in several regions of the magnetosphere. Parametric decays of finite amplitude Alfvén/ion- cyclotron waves in the presence of He+ ions and a mixed population of thermal and hot ...
-
(2010)Nonlinear electrostatic instabilities have been shown to occur frequently and under very different conditions in plasma with two ion beams such as the fast solar wind. These instabilities can be triggered when the phase ...
-
(1992)The role of electrostatic ion-beam instabilities in the generation of the broadband electrostatic noise in the earth’s magnetotail and in electrostatic bursts in comets is discussed. The theory of electromagnetic ion-cyclotron ...
-
(Elsevier Ltd, 1998)A flash evaporation technique was implemented to grow polycrystalline thin films of BaTiO3 onto Si(100) substrates, which were prepared with protective layers of SiO2 or Pt/TiW. X-ray diffraction and X-ray photoelectron ...
-
(Springer-Verlag, 1995)A two dimensional numerical investigation of the unsteady laminar flow pattern and forced convective heat transfer in a channel with a built-in rectangular cylinder is presented. The channel in the entrance region has a ...
-
(Cambridge Univ Press, 2000)It is well known that ion-beam-plasma interactions can destabilize right- and left-hand polarized electromagnetic waves. Owing to the fact that these instabilities have mostly been studied numerically by solving the ...
-
(1984)Nonideal effects such as viscosity and thermal conductivity on the stability of a cylindrical current‐carrying plasma in a shearless magnetic field are studied. It is shown that for magnetic fields satisfying Bθ/Bz ≫1, ...
-
(1997)A circularly polarized electromagnetic wave, propagating in the direction of an external magnetic field in an electron-positron plasma, is known to be unstable for frequencies less than half the plasma frequency. This has ...
-
(Blackwell Publishing Ltd, 2009)It is well known that nonlinear electrostatic instabilities can be triggered in a plasma with streaming ion species in the presence of finite-amplitude Alfvén cyclotron waves. The instability occurs when the phase velocity ...
-
(1997)We study the parametric decays of a large amplitude, linearly polarized electromagnetic wave in an electron-positron plasma. We include harmonic generation, the ponderomotive force, and weakly relativistic effects. It is ...
-
(1989)In a previous paper [J. Plasma Phys. 34, 299 (1985)] it was shown that resistivity and thermal conductivity lead to large scale stationary convection in a current-carrying cylindrical plasma under the action of a shearless ...
-
(1984)It is shown that the combined effect of resistivity and thermal conductivity is responsible for the existence of marginal stationary modes in a cylindrical current-carrying plasma, under the influence of a shearless magnetic ...