ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effects of perpendicular velocity profile on sheared slab ηi instability at the tokamak internal transport barrier (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1034-1037 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stability of the sheared slab ηi mode at the tokamak internal transport barrier (ITB) off and near the minimum-q magnetic surface is studied under the assumption that the profile of the perpendicular rotation velocity has a Gaussian distribution. The results show that the effects of the perpendicular velocity profile with shear and curvature depend on the regimes with finite or weak magnetic shear where the ITB is located; on the rotation direction along the ion or electron diamagnetic drift; and on the mode structure of the eigen perturbation. The stabilizing or destabilizing roles of the perpendicular velocity shear and curvature are numerically analyzed in detail. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873344
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A novel approach to a transport model for ultra-small-scale compound semiconductor devices (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3539-3549 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The concepts of the previously developed macrokinetic distribution function and the ensemble average are used to develop a transport model that can account for effects of intervalley transfer, anisotropic scattering, and nonequilibrium dynamics of electrons in compound semiconductors. The developed transport model is rather simple and can be used for modeling of ultra-small-scale transport behavior of electrons in compound semiconductor devices. The developed model is applied to various multivalley semiconductor models. The study shows that the energy-dependent macroscopic effective mass of electrons in nonparabolic bandstructure, that is usually assumed for modeling of devices, is inadequate in situations where strong anisotropic scattering is involved and velocity overshoot is pronounced. It is found that the momentum dependence of the macroscopic effective mass is also significant during the interval of pronounced velocity overshoot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352341
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Determination of iodine adlayer structures on Au(111) by scanning tunneling microscopy (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 585-591 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Chemisorbed iodine adlayers on Au(111) films on quartz were studied using scanning tunneling microscopy (STM) at room temperature in air. The iodine was adsorbed by successive deposition of droplets of a dilute solution of iodine in methanol. As a function of coverage, various adlayer structures were obtained. By changing the tunneling parameters, either the iodine adlayer or the Au(111) substrate can be imaged with atomic resolution. In this way, the adlattice properties such as periodicity, orientation and the local absolute coverage have been characterized with high accuracy. In the low coverage range (θ〈0.33), due to the high mobility of iodine atoms, only the unreconstructed Au(111) substrate lattice could be imaged. At θ∼0.33, a (3×3)R30° structure is evident. With increasing coverage, a (p×3) structure of higher iodine packing density is observed, which can be described as a uniaxially compressed (striped) phase. Finally, near monolayer saturation coverage the iodine atoms form a hexagonal moiré-like pattern with long-range height modulation. The results are compared with previous measurements on this system under UHV and electrolyte conditions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474419
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Sheared slab ηi instability in tokamak plasma with negative magnetic shear (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 959-965 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The sheared slab ηi instability is reconsidered in tokamak plasma with negative magnetic shear. A modified sheared slab model is presented to include both the magnetic shear and its variation with the magnetic surface. The results show that the slow variation of magnetic shear can aggravate the sheared slab ηi instability in the region near the minimum-q magnetic surface and that it has a weak stabilizing role in the plasma core near the axis. However, when the effect of the variation of magnetic shear increases, it can give rise to a stronger slab ηi instability. In addition, a linear mode coupling mechanism could be mediated by the variation of magnetic shear with a magnetic surface. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872664
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Even and odd modes driven by the trapped ion temperature gradient over the secular scale (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3337-3343 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the long wavelength limit, the trapped ion temperature gradient driven modes on the secular scale are investigated by considering the lowest order effects of the finite banana orbit width and using the two-scale expansion. Attention is focused on the effects of the wave–particle interaction over the secular scale. Also, the effects of the collisionless trapped electron dynamics are considered. The eigenmode equation derived is in the form of a modified Bessel equation. The even modes are almost not influenced by the effects of the wave–particle interaction. But for odd modes, the wave–particle interaction can give rise to instabilities of the ion branches. These odd modes are similar to the trapped ion scattering modes pointed out first by Coppi and Rewoldt [Advances in Plasma Physics, edited by A. Simon and W. Thompson (Wiley, New York, 1976), Vol. 6, p. 421]. The dependence of the growth rates on the ion temperature gradient is analyzed numerically. The typical eigenfunction curves of both the even and odd modes driven by the trapped ion temperature gradient over the secular scale are displayed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871603
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Manipulation and writing with Ag nanocrystals on Si(111)-7×7 (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2698-2700 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Manipulation of Ag nanocrystals derived from up to 200 000 atoms was performed using the tip of a scanning tunneling microscope. By varying the scanning conditions, it was possible to move them laterally on contamination-free Si(111)-7×7 surfaces or to remove them. In both cases, thin Ag tracks were left behind. This demonstrates the concepts of nano patterning and nano painting with metals on clean semiconductor surfaces. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    facet.materialart.
    Unknown
    Electronic and structural properties of ultrathin tungsten nanowires and nanotubes by density functional theory calculation (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-10-04
    Description: The simulated annealing basin-hopping method incorporating the penalty function was used to predict the lowest-energy structures for ultrathin tungsten nanowires and nanotubes of different sizes. These predicted structures indicate that tungsten one-dimensional structures at this small scale do not possess B.C.C. configuration as in bulk tungsten material. In order to analyze the relationship between multi-shell geometries and electronic transfer, the electronic and structural properties of tungsten wires and tubes including partial density of state and band structures which were determined and analyzed by quantum chemistry calculations. In addition, in order to understand the application feasibility of these nanowires and tubes on nano-devices such as field emitters or chemical catalysts, the electronic stability of these ultrathin tungsten nanowires was also investigated by density functional theory calculations.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...