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  • 1
    Electronic Resource
    Electronic Resource
    Coalescence of two parallel current loops in a nonrelativistic electron–positron plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 844-852 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The coalescence of two parallel current loops in an electron–positron plasma is investigated by a three-dimensional electromagnetic relativistic particle code. Instead of mixing uniformly in the dissipation region as observed for current coalescence in an electron–ion plasma, electrons and positrons initially in the loops are driven to move separately by the magnetic gradient drift. Redistribution of the current-carrying electrons and positrons creates new current loops, which coalesce again, if the initial drift velocities remain greater than a critical value after coalescence. It was found that the energy stored in the current loops dissipates gradually through several coalescences. Consequently, the electrons and positrons near the current loops are heated through the coalescence. This process is qualitatively different from the explosive energy release during coalescence in an electron–ion plasma. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871784
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  • 2
    Electronic Resource
    Electronic Resource
    Excitation of large-amplitude Alfvén waves in a nonrelativistic electron–positron plasma with a temperature anisotropy T⊥〉T(parallel) (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3501-3508 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Excitation of large-amplitude Alfvén waves in an anisotropic electron–positron plasma is investigated with a two-and-one-half-dimensional (2〈fraction SHAPE="CASE"〉12-D), electromagnetic particle code. If the plasma distribution is a bi-Maxwellian with T⊥/T(parallel)〉1, where the subscript symbols denote directions perpendicular and parallel to the ambient magnetic field, Alfvén waves with arbitrary polarization are generated. Simulations show that the amplitude of the waves increases both with increasing temperature anisotropy and parallel plasma β(parallel). The stabilization of individual wave modes occurs sequentially, from higher values of wave number down to lower ones, in the evolution of the temperature anisotropy instability. Wave–particle scattering by the enhanced waves maintains the initially bi-Maxwellian character throughout the simulation, even as it reduces T⊥ and increases T(parallel). After saturation of wave magnetic energy a large residual temperature anisotropy still remains and persists through the end of the simulation. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872247
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamics of relativistic electron-positron plasma cloud moving across a magnetic field (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3906-3911 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results from a three-dimensional electromagnetic and relativistic particle simulation of a relativistic electron-positron plasma cloud (Lorentz factor γ=5/3) moving perpendicular to an ambient magnetic field with background plasmas are presented. It is shown that, in addition to the charge sheaths created at both sides of the cloud, secondary charge structures are created in the central region of the cloud and many cloud particles expand along the magnetic field. The Alfvén waves with large amplitude (δB/B0≈0.03) and linear polarization are excited dominantly with wave number kzc/Ωc〈1, while the electromagnetic waves are weakly excited because of the relativistic effect of the cloud particles. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871579
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  • 4
    Electronic Resource
    Electronic Resource
    Effects on the resonant tunneling characteristics of a double-barrier diode of intentional and unintentional dopings in the quantum well (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 1452-1455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Donor-assisted resonant tunneling in nominally symmetric GaAs/(AlGa)As large area double-barrier diodes is investigated. The log(I)–V characteristics are used to evaluate doping density in the quantum well and are investigated in connection with donor cluster-assisted resonant tunneling. The single-donor-related feature in the resonant-tunneling characteristics is used to detect the presence of donors in the quantum well, even at concentrations of the order of the lowest achieved so far in molecular beam epitaxy GaAs. Expected effects of the presence of donors in the quantum well on the log(I) vs V characteristics are discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370911
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  • 5
    Electronic Resource
    Electronic Resource
    Filamentation Instability of Nonlinear Alfvén Waves and Plasma Heating associated with Recombination Effect (1998)
    Springer
    Solar physics 178 (1998), S. 43-53 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate plasma heating associated with the effect of recombination and the filamentation instability of Alfvén waves propagating along homogeneous magnetic field in low-beta plasmas, by using an MHD simulation code. The linear instability of Alfvén waves leading to the filamentation is investigated by imposing small density perturbations across a magnetic field. We show results of the nonlinear stage of the above filamentation instability and the plasma heating through a two-dimensional simulation. It is shown that the plasma heating is caused by localized heating and whole heating, which are associated with the filamentation instability and the effect of recombination, respectively. We discuss the implication of these results for plasma heating processes observed in the chromosphere of the Sun.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005000319171
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  • 6
    Electronic Resource
    Electronic Resource
    On shock-capturing schemes using artificial wind (1999)
    Springer
    Shock waves 9 (1999), S. 423-427 
    Details
    ISSN: 1432-2153
    Keywords: Key words:Galilean transformation, Shock-capturing scheme, Artificial wind
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract. We introduce and apply a new way for the construction of efficient non-oscillatory shock-capturing schemes for fluid dynamic and magneto-hydro-dynamic simulations. The basic idea is to solve the governing equations in different steadily moving frames of reference chosen in such a way that the flow would be supersonic there resulting in simple upwind formulas for fluxes across control volume faces. An extra velocity (artificial wind) is added to the velocity of the flow under simulation when the system of coordinates is changed. The approach allows to simplify existing schemes and to get new modifications. Test problems demonstrate that the derived schemes provide accurate results while being simple and efficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001930050173
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  • 7
    Electronic Resource
    Electronic Resource
    The role of loop footpoints rotation in single loop flares (1996)
    Springer
    Astrophysics and space science 246 (1996), S. 107-118 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider that single loop flares can be caused by the rotation of loop footpoints. Choosing a typical geometry for this case we find from MHD equations self-consistent expressions and a set equations governing behaviour of all physical quantities. Numerical simulations have revealed that under the determined conditions for the initial azimuthal velocity and current the pinch instability takes place. The most important parameters of the problem are the plasma β and the ratio of the initial values of longitudinal and poloidal components of the magnetic field-B 1. Thus, calculations show that the critical pinch time increases with the increase ofB 1 and decreases with the increase of plasma β. So the most effective flares are probable for the most high loops with strong currents. ForB 1=10 and β=0.01 the critical pinch time is ≈2.5 s. The critical twist angle for magnetic field depends on the initial one. For low intial twist which corresponds to bigB 1 the critical one is more less. For exampleB 1=30 gives Φ≈1.8π (when ratio of loop length and radius is 10). Geometrical analysis shows that the present model can explain (for high photospheric rotation) single loop flares taking place on different parts of the loop as on the top of it as closer to one of the footpoints. It depends on the relative rotation momentum of loop footpoints. Subject headings: MHD-Sun:flares.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637402
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  • 8
    Electronic Resource
    Electronic Resource
    Book reviews (1995)
    Springer
    Space science reviews 73 (1995), S. 435-444 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00751242
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  • 9
    Electronic Resource
    Electronic Resource
    Compatibility and tensile behavior of polypropylene/ethylene-propylene rubber blends (1995)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 35 (1995), S. 1261-1271 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This study clarifies and quantifies factors which increase the ductility of a low-molecular-weight propylene homopolymer having an intrinsic viscosity of 0.89 dl/g. The tensile behavior of homopolymer/ethylene-propylene rubber (EPR) blends was studied from the viewpoint of the associated molecular structure of EPR and its compatibility with the homopolymer. When EPR is “dissolved” in a homopolymer, the glass transition temperature (Tg) of the amorphous phase of a homopolymer was found to shift to a lower temperature, with homopolymer/EPR compatibility being subsequently evaluated using this shift, i.e., Δtg. Results show two conditions are required to improve the ductility of the low-molecular weight propylene homopolymer: ΔTg must be ≥ 3°C and ≥ 30 wt% EPR must be blended with the homopolymer.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760351602
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  • 10
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    Singularities in the Rayleigh-Taylor instability of a thin plasma slab (1999)
    American Physical Society
    Details
    Publication Date: 1999-02-01
    Print ISSN: 1063-651X
    Electronic ISSN: 1095-3787
    Topics: Physics
    Published by American Physical Society
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