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  • 1
    Electronic Resource
    Electronic Resource
    Marcus' contributions to semiclassical theory of collisions and bound states (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 3466-3466 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100407a003
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  • 2
    Electronic Resource
    Electronic Resource
    Complex angular momentum analysis of rotationally inelastic diffraction scattering in sudden atom-homonuclear–molecule collisions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1668-1687 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new complex angular momentum (CAM) theory of rotationally inelastic scattering has been developed for atom homonuclear–diatomic molecule collisions. The CAM theory is valid for sudden collisions, when the infinite-order-sudden (IOS) approximation for atom rigid-rotator scattering is appropriate. In the IOS/CAM theory, the inelastic scattering amplitude is written in terms of two subamplitudes: a background integral and a residue series. Physically the background integral corresponds to particles scattered by the repulsive potential core, while the residue series corresponds to short lived surface waves that propagate around the potential core. Diffraction effects arise from the interference of these two subamplitudes. The IOS/CAM theory is more general and accurate than the simple Drozdov–Blair theory of inelastic diffraction scattering. The weak coupling limit of the IOS/CAM equations has also been investigated and a new phase rule has been derived that is more general than the Blair phase rule. Approximate conditions for the validity of the new phase rule have been investigated using a model anisotropic potential of the form [g(γ)/r]n, n≥3. Numerical calculations of inelastic angular distributions using the IOS/CAM equations have been made for the strongly anisotropic He–N2 and weakly anisotropic Ne–D2 collision systems. Using a semiclassical approximation to the background integral and a single Regge pole term in the residue series, we obtain good agreement with conventional partial wave IOS angular distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457075
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  • 3
    Electronic Resource
    Electronic Resource
    Stability of toroidicity-induced drift waves in divertor tokamaks (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1449-1458 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of toroidicity-induced drift waves in a tokamak equilibrium with magnetic separatrix is studied both analytically and numerically. In particular, the task of a proper determination of the complex ballooning parameter θ0 is performed by solving the stationarity condition for the eigenvalue. Results show qualitative dependence on the location of the x point in the meridian plane. Specifically, locating the x point in the equatorial plane, both on the outside and on the inside of the plasma, causes a deepening of the well structure in the potential for the eigenmode, thereby enforcing the inhibition of the shear damping and the marginal stability result obtained in the circular magnetic surfaces case. On the other hand, the location of the x point at the top of the plasma produces a flattening of the well and restores the shear damping, yielding stabilization of the mode. A new quasimarginally stable branch, corresponding to modes localized around the x point, is shown to exist at high values of the separatrix parameter k and x-point location close to the equatorial plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859201
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  • 4
    Electronic Resource
    Electronic Resource
    Tearing modes in toroidal geometry (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 577-590 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The separation of the cylindrical tearing mode stability problem into a resistive resonant layer calculation and an external marginal ideal magnetohydrodynamic (MHD) calculation (Δ' calculation) is generalized to axisymmetric toroidal geometry. The general structure of this separation is analyzed and the marginal ideal MHD information (the toroidal generalization of Δ') required to discuss stability is isolated. This can then, in principle, be combined with relevant resonant layer calculations to determine tearing mode growth rates in realistic situations. Two examples are given: the first is an analytic treatment of toroidally coupled (m=1, n=1) and (m=2, n=1) tearing modes in a large aspect ratio torus; the second, a numerical treatment of the toroidal coupling of three tearing modes through finite pressure effects in a large aspect ratio torus. In addition, the use of a coupling integral approach for determining the stability of coupled tearing modes is discussed. Finally, the possibility of using initial value resistive MHD codes in realistic toroidal geometry to determine the necessary information from the ideal MHD marginal solution is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866840
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  • 5
    Electronic Resource
    Electronic Resource
    Resistive ballooning modes in an axisymmetric toroidal plasma with long mean free path (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2201-2208 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tokamak devices normally operate at such high temperatures that the resistive fluid description is inappropriate. In particular, the collision frequency may be low enough for trapped particles to exist. However, on account of the high conductivity of such plasmas, one can identify two separate scale lengths when discussing resistive ballooning modes. By describing plasma motion on one of these, the connection length, in terms of kinetic theory the dynamics of trapped particles can be incorporated. On the resistive scale length, this leads to a description in terms of modified fluid equations in which trapped particle effects appear. The resulting equations are analyzed and the presence of trapped particles is found to modify the stability properties qualitatively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865272
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A centrifugal sudden distorted wave study of the chlorine atom + hydrogen chloride .fwdarw. chlorine hydride + chlorine atom reaction: results for a scaled and fitted ab initio potential energy surface having a noncollinear reaction path (1988)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 3190-3195 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100322a030
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  • 7
    Electronic Resource
    Electronic Resource
    An improved Bessel uniform approximation of non-integer order for use in semiclassical collision theory: application to vibrationally inelastic molecular collisions (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 3599-3603 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100407a027
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  • 8
    Electronic Resource
    Electronic Resource
    Modeling of TCE Contamination and Recovery in a Shallow Sand Aquifer (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 25 (1987), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The U.S. Geological Survey (USGS) Solute Transport Model is a widely used, well-documented computer code which simulates contaminant transport in ground water using a finite-difference grid and the method of characteristics. In this study, the model was applied to an industrial site where trichloroethylene (TCE) and other industrial solvents had contaminated a shallow sand aquifer. At the study site, the geology was well-characterized and the migration of the contaminant plume was monitored by a network of 15 wells.Although the rate of release of the industrial solvents to the aquifer was unknown, the model gave a good prediction of the movement of the plume when the release of contaminants was modeled as a point source injection. The model was also successful in simulating the behavior of the plume under the influence of a recovery system. During simulation of a four-well withdrawal system, model predictions of TCE concentrations and hydraulic head in the aquifer matched actual data collected at two points in time after start-up of the recovery system. The model predicted that the same configuration of withdrawal wells would reduce concentrations of TCE in the ground water from approximately 1000 μg/1 to 6 μg/1 after two years of pumping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1987.tb02117.x
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  • 9
    Electronic Resource
    Electronic Resource
    Neural Pacemakers and Rhythmicity (1985)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physiology 47 (1985), S. 17-26 
    Details
    ISSN: 0066-4278
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ph.47.030185.000313
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  • 10
    Electronic Resource
    Electronic Resource
    Theory of large angle elastic differential cross sections for complex optical potentials: Semiclassical calculations using partial waves, l windows, saddles, and poles (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 188-195 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Four semiclassical (WKB) theories have been used to calculate the large angle elastic scattering for a strongly absorptive complex optical potential modeled on Li+HBr. Two theories—the partial wave and l-window formalisms—use first-order single turning point WKB phase shifts for a large number of discrete (integral) angular momenta. The other two theories involve saddle point evaluations of background and subamplitude contour integrals, together wth WKB calculations of the residues and positions of complex angular momentum poles of the S matrix. There are large numerical discrepancies in the differential cross sections at backward angles between the two real angular momentum and the two complex angular momentum theories. Reasons for these discrepancies are analyzed. The complex angular momentum cross sections are more accurate than those computed from the real angular momentum theories and agree closely with l-window calculations using accurate quantum phase shifts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452609
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