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  • 1995-1999  (25)
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  • 1
    Digitale Medien
    Digitale Medien
    Transient light absorption in polydiacetylene films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1779-1782 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The sign of the transient transmission in PDA 4BCMU film (polydiacetylene 4-butoxycarbonalmethylurethane) was experimentally investigated as a function of excitation wavelength and intensity. The observed decrease in the transient transmission (ΔT〈0) from 2.05 eV (605 nm)〈ωex〈2.16 eV (574 nm) is attributed to triplet absorption. The triplet is created by a two-photon absorption process followed by a fast fission process. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363026
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  • 2
    Digitale Medien
    Digitale Medien
    Femtosecond photoinduced dichroism in polydiacetylene 4bcmu film (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4288-4290 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Femtosecond pulses were used to study the photoexcitation dynamics and transient photoinduced dichroism in polydiacetylene 4BCMU film. Ultrafast photoinduced dichroism and optical Kerr gate response were observed. These measurements allowed estimation of the diffusion constant (D∼0.1 cm2/s), nonlinear index of refraction (n2∼10−8 esu), and third-order susceptibility (Δχ(3)∼6 × 10−10 esu), in the film. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360702
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  • 3
    Digitale Medien
    Digitale Medien
    Effects of barrier height fluctuations and electron tunneling on the reverse characteristics of 6H–SiC Schottky contacts (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3701-3707 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Analytic calculations of electron transport across a Schottky barrier in 6H–silicon carbide are presented. The treatment includes the effect of barrier height fluctuations and image charge lowering on both the thermionic emission and electron tunneling processes. The results show that barrier height inhomogeneities are very important, and can lead to reverse current densities that are orders of magnitude higher than obtained from a simple theory. Formation of detrimental filamentary currents are predicted. The results are in very good agreement with published experimental data at 300 K. Finally, under forward biasing conditions, the analytical theory yields ideality factors of 1.037 in close agreement with measurements. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369735
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  • 4
    Digitale Medien
    Digitale Medien
    Dislocation defect based model analysis for the pre-breakdown reverse characteristics of 4H–SiC p+n diodes (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7935-7938 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A model analysis of the reverse characteristics of 4H–silicon carbide diodes in the pre-breakdown regime is carried out to probe the physics and qualitative trends arising from the presence of dislocations and traps in the material. Results compare favorably with recent data. The response is shown to be controlled primarily by the impact ionization process. With dislocation defects, significant increases in the device current, a softer threshold and lower hold-off capabilities are predicted in keeping with measurements. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370611
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  • 5
    Digitale Medien
    Digitale Medien
    Toroidal rotation effect on the ballooning modes of low frequency under gyrokinetic description (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1403-1409 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Gyrokinetic theory for ballooning modes with frequency lower than the thermal ion bounce frequency is presented. Due to a vast difference of the centrifugal and the Coriolis forces experienced by ions and electrons, the parallel electric field effect is found to be excited even in this low frequency case. Nevertheless, it is proved that, under suitable ordering assumptions, the magnetohydrodynamic (MHD)-structure-like ballooning mode equation can still be obtained. The kinetic effects are found to appear in three aspects: enlarging the magnitude of the apparent inertia, resulting in a real shift of the marginal frequency, and contributing a stabilizing term. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872800
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  • 6
    Digitale Medien
    Digitale Medien
    Kinetic analysis of the ballooning modes of comparable frequency regime in rotating plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 720-729 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An analytical method based on two-scale analysis is developed to solve the combined boundary and initial value problem describing the ballooning modes with frequency comparable to the parallel ion acoustic one in toroidally rotating plasmas. A sonic rotation is shown possibly to be harmful for the stability. A subsonic rotation is anticipated to always play a role of stabilizing the strong ballooning modes. But, the stabilizing effect of a subsonic rotation on the weak ballooning modes is negligible. A comparison with the ideal magnetohydrodynamic (MHD) analysis is presented. The scheme for including the kinetic effects into the MHD analysis is given. The different features of the ion temperature gradient modes [L.-J. Zheng and M. Tessarotto, Phys. Plasmas 3, 4610 (1996)] and the ballooning modes in the presence of toroidal rotation are also discussed. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872166
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  • 7
    Digitale Medien
    Digitale Medien
    Collisional effect on the magnetohydrodynamic modes of low frequency (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1029-1037 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The kinetic singular layer equation is derived from the ballooning representation formalism. The mode frequency and the ion-ion collision frequency are assumed to be lower than the ion transit frequency. It is proven that the balance between the instability drives and the small-parallel-ion-velocity (SPIV) effect, instead of inertia effect, has to be imposed on determining the eigenfrequency. Consequently, it is found that the resistive effect is ignorable, while the dominant collisional effect appears to be the collisional contribution to the SPIV effect, leading to the conclusion that the customary resistive magnetohydrodynamic modes, such as the resistive interchange, resistive ballooning, and tearing modes, are nonexistent in this description. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871758
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  • 8
    Digitale Medien
    Digitale Medien
    Kinetic analysis of the ion temperature gradient modes in toroidally rotating plasmas (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4610-4619 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: With the two time scale feature revealed, an analytical method is developed to solve the combined eigenvalue and initial value problem describing the ion temperature gradient (ITG) modes in the toroidally rotating plasmas. With full gyrokinetics and toroidal geometry effects being taken into account in an ordering consistent manner, dispersion relations are obtained for ITG modes both of toroidal and slab-like branches. The results show that the sonic rotation can be harmful for the stability, while subsonic rotation with flow shear can be expected to be stabilizing. The existence of the flow shear leads the time evolution of the fluctuation signals to display two different time scales—a fast oscillating (either fast or slow growing) signal with its amplitude modulated by a slowly varying envelope, resembling fishbone-like fluctuations. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872032
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  • 9
    Digitale Medien
    Digitale Medien
    A new solution method for the gyrokinetic Fokker-Planck equation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3614-3622 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A new non-perturbative and non-variational solution method is proposed for the gyrokinetic equation, based on a suitable approximation for the linearized Fokker-Planck collision operator. The approach, which allows, in principle, the accurate evaluation of arbitrary moments of the distribution function for a weakly collisional magnetoplasma with toroidal equilibria of arbitrary aspect-ratio, is susceptible of numerous significant applications, both for transport calculations, i.e., in particular, leading to the evaluation of neoclassical fluxes, as well for the investigation of linear stability analyses of dissipative perturbations. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871061
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  • 10
    Digitale Medien
    Digitale Medien
    Quasi-helical magnetohydrodynamic equilibria in the presence of flow (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2653-2663 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: By investigating the conservation laws of guiding-center mechanics, an extension of quasi-helical static magnetohydrodynamic equilibria to incorporate strong flow is obtained, subject to suitable ordering assumptions. Such equilibria correspond to self-consistent Fokker-Planck kinetic equilibria in the presence of a quasi-helical magnetic field. The effect of small symmetry-breaking contributions in the magnetic field is investigated. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871522
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