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  • 1
    Series available for loan
    Series available for loan
    Untersuchungen zum Schädigungspotential von Bohrspülungen : Return Permeability Tests unter dynamischen Bedingungen ; Laufzeit des Projektes: 01.12.2006 - 30.06.2011 (2012)
    Hamburg : DGMK
    Associated volumes
    Details Availability
    Call number: S 97.0506(674-2)
    In: Forschungsbericht
    Type of Medium: Series available for loan
    Pages: 84 S. : z.T farb. Ill.+ graph. Darst. , Ill., graph. Darst.
    Edition: Als Ms. gedr.
    ISBN: 9783941721272
    Series Statement: Forschungsbericht / DGMK, Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V. 674-2
    Classification:
    Geophysical Exploration, Geophysical Prospecting
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Edge-localized mode simulations in divertor tokamaks (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4095-4101 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The three-dimensional nonlinear evolution of moderate wavelength pressure-driven edge-localized instabilities is calculated in divertor tokamaks. The evolution consists of several stages: linear growth, nonlinear saturation and turbulence, shear flow generation, pressure outflow to the outboard divertor, and finally, outflow to the inboard divertor. The shear flow generation appears to be an important factor in transporting pressure perturbations to the inboard side, and in causing pressure loss to the inboard divertor. The physical model consists of dissipative compressional reduced magnetohydrodynamics which includes the important effect of sound wave propagation. A novel numerical discretization, using a poloidal unstructured mesh and a staggered toroidal mesh, has been implemented on a parallel, distributed memory computer. Nonlinear, three-dimensional numerical computations include a separatrix X-point in the computational domain. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871541
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  • 3
    Electronic Resource
    Electronic Resource
    Reconnection of coalescing magnetic islands (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 495-502 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamics of magnetic reconnection in the framework of two-dimensional incompressible magnetohydrodynamics is studied numerically. The case of a doubly periodic array of magnetic islands where coalescence of neighboring islands occurs due to self-consistent magnetic forces is investigated. To adequately resolve the current sheets which evolve in between two islands adaptive structured mesh methods are applied. At the onset of the reconnection process the kinetic energy rises and drops rapidly and afterward settles into an oscillatory phase. The time scale of the magnetic reconnection process is not affected by these fast events but consistent with the Sweet–Parker model of stationary reconnection. When the spatial extension of the system is enlarged it undergoes a sequence of merging processes and unstable equilibria towards a large-scale pattern of magnetic islands. During this process the frequency of the oscillations in the kinetic energy is found to scale with the island size. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873193
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetohydrodynamic effects on pellet injection in tokamaks (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2676-2686 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The location at which pellets are injected into a plasma can have a significant effect on what fraction of the pellet mass remains in the plasma for refueling purposes. Magnetohydrodynamic (MHD) simulations presented here, confirm the results of pellet injection experiments: toroidal curvature makes it favorable to inject pellets from the inboard side or from the top or bottom, rather than from the outboard side. Sufficiently large pellets injected at the inboard edge can reach the plasma center, and in the process drive magnetic reconnection to produce negative central shear. Injection at the top (or bottom) of the tokamak causes relatively little displacement of the pellet. A scaling law is obtained for pellet displacement which agrees well with the simulations. The MHD simulations were carried out with a new unstructured mesh finite element version of the MH3D full MHD code. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872955
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  • 5
    Electronic Resource
    Electronic Resource
    Poloidal rotation spin-up in divertor tokamaks (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 1229-1235 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Poloidal spin-up can occur in divertor tokamaks as a consequence of magnetic field geometry. The presence of a divertor X point causes poloidal variation in the diffusion of particles and heat. The resulting pressure variation on flux surfaces produces a poloidal torque. The spin-up is opposed by sound wave propagation. The physical model consists of dissipative compressional reduced magnetohydrodynamics (CRMHD), including viscous stress. Numerical computations have been carried out using an adaptive unstructured mesh method capable of good resolution near a separatrix X point. The simulations show poloidal flow spin-up increasing with pressure diffusivity. A theory is derived that is consistent with the simulations. The equilibrium poloidal E×B/B2 drift velocity is a root of a fifth-order polynomial. Bifurcations from one rotation state to another can occur at critical parameter values. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871399
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared Study of the Amide Group Isolated in an Amorphous Hydrocarbon Matrix at Low Temperature: Aggregation and Rearrangement upon Annealing (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 2214-2223 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100007a061
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  • 7
    Electronic Resource
    Electronic Resource
    Detection and Measurement of Microaggregation in Binary Mixtures of Esters and of Phospholipid Dispersions (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 8432-8439 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100020a082
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  • 8
    Electronic Resource
    Electronic Resource
    The interaction of H2 with water ice by neutron scattering: Rotation and translation (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 7354-7358 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The inelastic neutron scattering from H2 in D2O ice at energy transfers that correspond to rotation-translation are presented. Both the first energy gain and the energy loss peaks are observed. The position of the peaks shows that the H2 molecules execute nearly free rotation. The translational (recoil) contribution to the band positions as well as their widths can be fit by free translation with the molecule having an effective mass of about 1.7M0 where M0 is the mass of H2. The experimental results are compared to the available computer simulations. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478637
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  • 9
    Electronic Resource
    Electronic Resource
    A compact Penning trap for light ions (1995)
    Springer
    Applied physics 60 (1995), S. 89-94 
    Details
    ISSN: 1432-0649
    Keywords: 07.55.+x ; 07.75,+h ; 06.30-k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe the construction of a novel compact Penning trap from strong permanent magnets for trapping light ions. Our cylindrically symmetric, iron-free magnetic configuration allows fully analytical treatment, is easy to handle and to optimize. The magnetic field inhomogeneity is less than 1% in a volume of 1 cm3 at 0.7 T. The stored H+ and H 2 + ions in this trap are detected electrically by the rf absorption method. The charge density, total number and storage time of the trapped ions are measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01135848
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  • 10
    Electronic Resource
    Electronic Resource
    The sulfur and strontium isotopic compositions of Permian evaporites from the Zechstein basin, northern Germany (1998)
    Springer
    Geologische Rundschau 87 (1998), S. 192-199 
    Details
    ISSN: 0016-7835
    Keywords: Key words Upper Permian ; Zechstein ; Sulfate ; Sulfur isotopes ; Strontium isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The sulfur isotopic composition of stratigraphically well constrained samples from five evaporitic cycles of the German Zechstein (upper Permian) displays no systematic lateral variation and no significant temporal trend. With an average δ34S value close to 11‰, results confirm the previously determined sulfur isotope minimum for Phanerozoic seawater. Least radiogenic 87Sr/86Sr ratios for these sulfates define a clear temporal variation with a minimum value at 0.707008. A conclusive assessment of this temporal trend in comparison with other data sets for upper Permian seawater is not possible due to substantial differences in (bio)stratigraphic assignments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050201
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