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  • 1
    Electronic Resource
    Electronic Resource
    Mean-field theories for multidimensional diffusion (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2758-2767 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Self-consistent-field (SCF) methods are developed for solution of multidimensional diffusion problems. Time-dependent self-consistent-field (TDSCF) equations are derived for the Smoluchowski diffusion equation, and are applied to a two-dimensional barrier crossing problem. This is compared to both time-dependent and time-independent SCF approximations derived for the Schrödinger equation in imaginary time, which is obtained by transformation of the diffusion equation. Results for the model problem show that the TDSCF approximation for the original diffusion equation is accurate, efficient, and readily implementable in higher dimensions. Applications to diffusion problems in condensed media are noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455923
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  • 2
    Electronic Resource
    Electronic Resource
    STRONTIUM-90 IN THE SOILS OF THE NEW YORK CITY AREA (1962)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 93 (1962), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1962.tb30506.x
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  • 3
    Electronic Resource
    Electronic Resource
    Slow Expansion of a Plasma Column Without the Application of a Magnetic Field (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 1244-1246 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE device Maya was built with the view of creating and investigating a plasma originating in the positive column of an arc discharge, during and subsequent to the rapid ejection of the discharge-tube walls. A suitable magnetic field would be applied to confine the exposed plasma and the neutral ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1991244a0
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  • 4
    Electronic Resource
    Electronic Resource
    A constitutive O^6-methylguanine-DNA methyltransferase of Rhizobium meliloti
    Amsterdam : Elsevier
    Mutation Research/DNA Repair 235 (1990), S. 165-169 
    Details
    ISSN: 0921-8777
    Keywords: DNA methyltransferase ; Nitrogen-fixing bacterium, DNA methyltransferase activity ; O^6-Methylguanine-DNA methyltransferase ; Rhizobium meliloti, DNA methyltransferase activity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0921-8777(90)90070-L
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  • 5
    Electronic Resource
    Electronic Resource
    TUTORIAL DISTRIBUTION OF ALTERNATING ELECTRICAL CHARGES IN A CONDUCTING MEDIUM (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 33 (1985), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The main features of the distribution of volume and surface charges in a conducting medium can be described separately for direct and alternating electromagnetic fields. The density of charges depends on the conductivity of a medium and on the electrical field. The relation is particularly simple for the quasi-stationary field, i.e., when the influence of displacement currents is negligible. Conditions are formulated under which electrical charges arise in a conducting medium: electrical charges are shown to exist for direct and quasi-stationary fields when there is a component of electric field parallel to the gradient of conductivity. The density of these charges is proportional to the applied electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1985.tb00427.x
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  • 6
    Electronic Resource
    Electronic Resource
    Double-crossing mode conversion in nonuniform media (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 45-59 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new type of mode conversion between two linear waves in a nonuniform medium is investigated. Single-crossing conversion occurs when a ray of one wave crosses transversely the dispersion manifold of another wave. Double-crossing mode conversion theory describes when the ray punctures the dispersion manifold twice due to ray curvature. To study this new process, a one dimensionally nonuniform background medium is considered, which gives rise to four scenarios. These scenarios are distinguished on the basis of whether the two waves have equal or opposite energy signs, and whether they are copropagating or counterpropagating. Using modular-eikonal theory (suitable for multiple crossings), each scenario is first studied analytically by constructing an S-matrix relation between the outgoing and incoming asymptotic wave amplitudes. The analytical results are then compared with numerical results and excellent agreement is found. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872674
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  • 7
    Electronic Resource
    Electronic Resource
    Wave emission by resonance crossing (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4413-4419 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The emission of collective waves by a moving charged particle in a nonuniform medium is discussed. Emission occurs in a nonuniform medium when the local dispersion relation of the collective wave is satisfied. This is a form of resonance crossing. Using the Weyl symbol calculus, a local expansion of the collective wave equation driven by the particle source is derived in the neighborhood of the crossing. The collective wave dispersion manifold and the gyroballistic wave dispersion manifold can be used as a pair of local coordinates in the neighborhood of the resonance crossing, which greatly simplifies the analysis. This change of representation is carried out using a metaplectic transform (a generalization of the fourier transform). The Wigner function of the emitted wave field is then computed in the new coordinates. The Wigner function is a phase space scalar, hence the numerical value is invariant under linear canonical transformations. This invariance is invoked to finally arrive at the Wigner function in the original (physical) coordinates. The wave-action and -energy emission rates are then computed from the Wigner function. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870997
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  • 8
    Electronic Resource
    Electronic Resource
    Linear-conversion theory of energetic minority-ion Bernstein-wave propagation across gyroresonance in nonuniform magnetic field (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 64-71 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An energetic minority-ion population, such as neonatal fusion alphas, can support a Bernstein wave whose frequency is a harmonic of their gyrofrequency. The sign of the wave energy depends on the local wave vector, whose rate of change is proportional to the magnetic-field gradient. As a result of the field nonuniformity, the wave crosses the gyroresonance layer and its energy flips sign. This results in energy transfer to a gyroballistic mode (which exists only in the resonance layer), with a conversion coefficient exactly equal to 2. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871824
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  • 9
    Electronic Resource
    Electronic Resource
    Comments on the U-series dating of molluscs from Southern California
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 14 (1972), S. 447-450 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(72)90147-1
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  • 10
    Electronic Resource
    Electronic Resource
    The residence time of thorium in surface sea water and its implications regarding the rate of reactive pollutants
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 20 (1973), S. 35-44 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(73)90137-4
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