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  • 1
    Electronic Resource
    Electronic Resource
    Wave and Joule heating in a rotating plasma (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 619-622 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laboratory experiments were conducted to investigate ion energization by the wave and Joule heating mechanisms in plasma with a radial electric field and an axial magnetic field subjected to increasing ion–neutral collision frequency. Wave and Joule heating regimes were isolated and a transition between the two regimes was observed as the ion–neutral collision frequency was varied. The data show that the dissipation of energy occurs via the mechanism operating on the shortest time scale. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873207
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  • 2
    Electronic Resource
    Electronic Resource
    Alkaloids of Sceletium species. III. Structures of four new alkaloids from S. strictum (1970)
    s.l. : American Chemical Society
    The @journal of organic chemistry 35 (1970), S. 3512-3518 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00835a071
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  • 3
    Electronic Resource
    Electronic Resource
    Strictamine (1966)
    s.l. : American Chemical Society
    The @journal of organic chemistry 31 (1966), S. 1641-1642 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01343a507
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  • 4
    Electronic Resource
    Electronic Resource
    Ion Bernstein waves driven by two transverse flow layers (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2504-2512 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interaction between two narrow layers of E×B flow is investigated, along with their stability properties. The mode frequencies, growth rates, and eigenfunctions are calculated. It is found that the instability due to a single layer is robust to the inclusion of a second layer. Specifically, when the separation between the layers is on the order of the ion-cyclotron radius, there is strong coupling between the two layers and the second layer is destabilizing. In addition, when the flow velocities are in opposite directions a wide variety of modes is possible, including near-zero-frequency modes, resulting in broadband structure in both the frequency spectrum and the wave number spectrum. These results may have implications for the understanding of the auroral ionosphere, where such spatial structure in the transverse electric field is often observed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872934
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  • 5
    Electronic Resource
    Electronic Resource
    Velocity-shear-induced ion-cyclotron turbulence: Laboratory identification and space applications (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 2523-2531 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laboratory measurements are reported that identify a new class of plasma oscillation driven by the inhomogeneity in wave energy density caused by transverse-velocity shear [Ganguli et al., Phys. Fluids 31, 823 (1988)]. The experiments concentrate on a branch of oscillation in the ion-cyclotron range of frequencies that results from the coupling of the magnetic-field-aligned current and the inhomogeneous dc electric field localized in a layer thicker than the ion gyroradius. The observed transition between the well-known current-driven electrostatic ion-cyclotron mode and this inhomogeneous energy–density-driven mode is related to the ratio of the azimuthal and axial Doppler shifts. The mode characteristics associated with the two instabilities have significantly different properties. For conditions of large transverse-velocity shear, turbulence is generated with a broadband, spiky spectrum around the ion-cyclotron frequency at small values of the magnetic-field-aligned current. The experimental identification is reinforced with numerical results from a nonlocal eigenvalue condition. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871214
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  • 6
    Electronic Resource
    Electronic Resource
    Stability of an inhomogeneous transverse plasma flow : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1544-1551 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of a magnetized plasma that includes a sheared transverse flow is analyzed by using both fluid and kinetic formalisms. In addition to the well known Kelvin–Helmholtz modes it is found that another branch of oscillation exists which can dominate the collective effects in a plasma if the magnitude of shear in the transverse flow is sufficiently strong. The source of free energy for the new branch is an inhomogeneity in the energy density caused by the velocity shear. Kelvin–Helmholtz modes, when examined with a fluid theory, are found to be robust and therefore have dominated the analysis of plasma systems with velocity shear in both laboratory and space plasmas. However, when a kinetic formalism is applied to Kelvin–Helmholtz modes it is found that these modes are strongly Landau damped especially when the ion temperature is comparable to or larger than the electron temperature. In addition, since the Kelvin–Helmholtz mode is dependent explicitly on the second derivative of the flow it is sensitive to the profile of the flow. On the other hand, the new branch is dependent on the localized nature of the flow and hence it is less sensitive to the details of the flow profile. The two branches of oscillation are compared using both fluid and kinetic theories and their regimes of dominance discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872285
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  • 7
    Electronic Resource
    Electronic Resource
    Velocity shear-driven instabilities in a rotating plasma layer (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 4377-4383 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear stability of a radially localized layer rotating about the cylindrical axis in a magnetized plasma is investigated using an eigenvalue analysis. The eigenvalue equation is solved numerically in a parameter regime characteristic of the Space Physics Simulation Chamber (SPSC) experiments [Amatucci et al., Phys. Rev. Lett. 77, 1978 (1996)] at the Naval Research Laboratory (NRL). Four types of instabilities are predicted. They are type-A and type-B Kelvin-Helmholtz instabilities, a transverse current-driven instability, and the inhomogeneous energy density driven instability (IEDDI). A quantitative comparison between theory and experiment indicates that an experimentally observed fluctuation in a rotating plasma layer is an IEDDI. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873175
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  • 8
    Electronic Resource
    Electronic Resource
    Dispersive properties of a magnetized plasma with a field-aligned drift and inhomogeneous transverse flow (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3091-3106 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrostatic fluctuations driven by the combination of a magnetic-field-aligned electron current and a localized transverse electric field are investigated. Characteristic parameters, such as scale length and magnitude of the sheared E×B velocity, magnitude of the magnetic-field-aligned current, and temperature ratio τ≡Ti/Te are varied to include conditions associated with electrostatic waves driven entirely by magnetic-field-aligned current, driven entirely by transverse electric field, and driven by a combination of magnetic-field-aligned current and transverse electric field. It is shown that, in contrast to the homogeneous case of current-driven modes, the modes in the presence of a transverse-velocity shear can be unstable in a wider range of temperature ratio τ and they are broadband in frequency. Using a simplified model, numerical solutions of the nonlocal dispersion relation, and physical arguments, cases of stabilization and destabilization due to the inhomogeneous energy-density driven instability mechanism are studied for the ion-cyclotron, ion-acoustic and drift modes. The response of the plasma to transverse-velocity shear can be categorized as reactive or dissipative and conditions corresponding to the predominance of either one are evaluated. Possible applications of these results to space and laboratory plasma are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871656
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  • 9
    Electronic Resource
    Electronic Resource
    Electron–ion hybrid instabilities driven by velocity shear in a magnetized plasma (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1708-1723 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of a magnetized plasma is investigated in which a sheared electron flow channel is present. The flow's peak velocity and shear scale length are denoted by V and L, respectively. If the velocity channel is perpendicular to the confining magnetic field and L≤ ρi (ρi is the ion Larmor radius) an electrostatic instability develops whose frequency is on the order of the lower hybrid frequency. For V/(ΩeL) (approximately-greater-than) 0.02 (Ωe denotes the electron cyclotron frequency), the peak growth rate is on the order of the lower hybrid frequency when k(parallel) = 0 (in here, k(parallel) is the wave number along the magnetic field). For V/(ΩeL) (approximately-greater-than) 0.1 and k(parallel) = 0, the spectrum peaks when kyL ∼ 1, where ky is the wave number in the direction of the flow velocity. For this mode it is shown that (i) a net cross-field current is not required for the onset of instability and (ii) the growth rate is not reduced by a velocity profile with no net flow (spatially averaged). Hence we conclude that velocity shear is the only source of free energy. Further, it is shown that density gradients do not stabilize this mode. It follows that the mode presented in this work cannot be identified with the well-known modified two-stream instability. If the velocity channel is parallel to the confining magnetic field and the plasma is weakly magnetized, an instability driven by velocity shear is shown to exist, provided that V/(ωpeL) (approximately-greater-than) 0.32, where ωpe is the electron plasma frequency. It is shown that a net plasma current is not required in order for this instability to be excited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860028
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetic theory for electrostatic waves due to transverse velocity shears (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 823-838 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A kinetic theory in the form of an integral equation is provided to study the electrostatic oscillations in a collisionless plasma immersed in a uniform magnetic field and a nonuniform transverse electric field. In the low temperature limit (kyρi (very-much-less-than)1, where ky is the wave vector in the y direction and ρi is the ion gyroradius) the dispersion differential equation is recovered for the transverse Kelvin–Helmholtz modes for arbitrary values of k(parallel), where k(parallel) is the component of the wave vector in the direction of the external magnetic field assumed in the z direction. For higher temperatures (kyρi〉1) the ion-cyclotron-like modes described earlier in the literature by Ganguli, Lee, and Palmadesso [Phys. Fluids 28, 761 (1985)] are recovered. In this article the integral equation is reduced to a second-order differential equation and a study is made of the kinetic Kelvin–Helmholtz and the ion-cyclotron-like modes that constitute the two branches of oscillation in a magnetized plasma including a transverse inhomogeneous dc electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866818
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