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  • 1
    Electronic Resource
    Electronic Resource
    Reducing Uncertainty Associated with Ground-Water Flow and Transport Predictions (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 33 (1995), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Effective evaluation of ground-water flow and transport problems requires consideration of the range of possible interpretations of the subsurface given the available, disparate types of data. Geostatistical simulation (using a modified version of ISIM3D) of hydrofacies units produces many realizations that honor the available geologic data and represent the range of subsurface interpretations of unit geometry. Hydraulic observations are utilized to accept or reject the geometric configurations of hydrofacies units and to estimate ground-water flow parameters for the units (using MODFLOWP). These realizations are employed to evaluate the uncertainty of the resulting value of the response function (ground-water flow velocity and contaminant concentration) using MT3D. The process is illustrated with a synthetic data set for which the “truth” is known, and produces a striking reduction in the distribution of predicted contaminant concentrations. The same system is evaluated three times: first with only hard data, then with both hard and soft data, and finally with only the realizations that honor the hydraulic data (i.e., those accepted after parameter estimation via inverse flow modeling). Using only hard data, the mean concentration predicted for all realizations at the point of interest is nearly two orders of magnitude lower than the true value and the standard deviation of the log of concentration is two. The addition of soft data brings the mean concentration within one order of magnitude of the true value and reduces the standard deviation of the log of concentration to one. After eliminating realizations using inverse flow modeling, the mean concentration is one-third of the true value and the standard deviation of the log of concentration less than 0.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1995.tb00034.x
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of the human ubiquitin conjugating enzyme complex, hMms2–hUbc13 (2001)
    [s.l.] : Nature Publishing Group
    Nature structural biology 8 (2001), S. 669-673 
    Details
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The ubiquitin conjugating enzyme complex Mms2–Ubc13 plays a key role in post-replicative DNA repair in yeast and the NF-κB signal transduction pathway in humans. This complex assembles novel polyubiquitin chains onto yet uncharacterized protein targets. Here we report the crystal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/90373
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  • 3
    Electronic Resource
    Electronic Resource
    Emergent polarization structure in spectral lines from rotating stars of spectral type B (1984)
    Springer
    Astrophysics and space science 107 (1984), S. 61-69 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The emergent polarization structure within spectral lines from rapidly rotating stars of spectral type B5V has been computed for the Mgii 4481 Å doublet and Hγ for several angles of inclination and for rotational speeds of 0.5 and 0.9 of the critical rotational speed. It is found in this study that the emergent polarization within the Mgii 4481 Å doublet is currently unobservable with modern polarimeters. However, the polarization within Hγ should be observable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649614
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  • 4
    Electronic Resource
    Electronic Resource
    The transfer of polarized radiation in spectral lines: Formalism and solutions in simple cases (1985)
    Springer
    Astrophysics and space science 108 (1985), S. 31-66 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A general treatment of the transfer of polarized radiation in spectral lines assuming a Rayleigh phase function and a general law of frequency redistribution is derived. It is shown how nine families of coupled integral equations for the moments of the radiation field arise which are necessary to fully describe the state of polarization of the emergent radiation from a plane-parallel, semi-infinite atmosphere. The special case of angle independent redistribution functions is derived from the general formalism, and it is shown how the nine families of integral equations reduce to the six linearly independent integral equations derived by Collins (1972). To serve as a test of the formulation, solutions for isothermal atmospheres are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650118
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  • 5
    Electronic Resource
    Electronic Resource
    The transfer of polarized radiation in spectral lines: Solar-type stellar atmospheres (1984)
    Springer
    Astrophysics and space science 106 (1984), S. 283-297 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The polarization structure in several spectral lines in solar type stars is computed using the method described by McKenna (1981, 1984a). The frequency redistribution function used for these calculations is a linear combination ofR II andR III. The line profiles and polarization structures have been computed for several weak solar resonance lines includingKi λ 7664 Å, Sri λ4607 Å, Baii λ4554 Å, for various polar angles along the stellar disk. Both the line profiles and polarization structures as well as the center to limb behavior of the line center polarization agree well with observations. The somewhat stronger resonance line Cai λ4227 Å shows a different polarization structure when compared to the weaker solar resonance lines. It is found that for strong resonance lines the proper redistribution function to be used is a linear combination ofR III andR v (see McKenna, 1981, 1984b; Heinzel, 1981). The major reason for this is that for strong resonance lines both the upper and lower levels are broadened by collisions. This violates the assumptions upon which the redistribution functionsR II andR III are based.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650356
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  • 6
    Electronic Resource
    Electronic Resource
    A method of computing the complex probability function and other related functions over the whole complex plane (1984)
    Springer
    Astrophysics and space science 107 (1984), S. 71-83 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the symmetry relations of the complex probability function (CPF), the algorithm developed by Humlíček (1979) to compute this function over the upper half plane can be extended to cover the entire complex plane. Using the Humlíček algorithm the real and imaginary components of the CPF can be computed over the whole complex plane. Because of the relation between the CPF and other interesting mathematical functions, fast and accurate computer programs can be written to compute them. Such functions include the derivatives of the CPF, the complex error function, the complex Fresnel integrals, and the complex Dawson's functions. Fortran implementations of these functions are included in the Appendix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649615
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  • 7
    Electronic Resource
    Electronic Resource
    The angle-dependent redistribution functionsR III andR IV: Line absorption probability distribution functions and reemission coefficients (1984)
    Springer
    Astrophysics and space science 106 (1984), S. 299-307 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The line absorption probability distribution functions and the reemission coefficients are derived for the non-coherent scattering functionsR III andR IV. The appropriate line profile function forR III is shown to be a simple Voigt function, while forR IV, the line absorption probability distribution function is more complex involving a linear combination of two Voigt functions and another more complex probability distribution. The structure of the reemission coefficients forR III andR IV is then discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650357
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  • 8
    Electronic Resource
    Electronic Resource
    The redistribution functionR IV (1986)
    Springer
    Astrophysics and space science 125 (1986), S. 103-114 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we address comments made in a recent paper by Hubený and Heinzel (1986). By use of an identity which they report, the photon redistribution function appropriate for scattering transitions between two radiation broadened atomic levels is derived using the simpler Voigt functions. The behaviour of the redistribution function relative to complete redistribution is then examined. It is important to note that the conclusions originally arrived at by McKenna (1984a) are reinforced by this examination. In particular, for most scattering angles, there exists a significant cohrently scattered component of the redistribution function, and the deviations from complete redistribution are large over most outgoing frequencies for a given incoming frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643976
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