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  • 1
    Electronic Resource
    Electronic Resource
    Fluoride release/uptake of polyacid-modified resin composites (compomers) in neutral and acidic buffer solutions (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of the present study was to evaluate the fluoride uptake/release of polyacid-modified resin composites (compomers) in neutral and acidic buffer solutions. Two compomers (Dyract® and Compoglass®) were tested and the conventional glass–ionomer cement (GIC) Vivaglass Base® served as a control. Forty specimens were fabricated from each of the respective materials. Twenty of these specimens were placed in artificial saliva and the other 20 specimens in a fluoridated dentifrice slurry for 5 min. Then, 10 fluoridated and 10 non-fluoridated specimens were immersed in a neutral buffer solution (pH 6·8), and the other specimens were immersed in an acidic solution (pH 4·0). After 1, 2, 3, 4, and 5 days the samples were again placed in either a fluoridated dentifrice slurry or saliva for 5 min, after which time they were transferred to fresh buffer solutions. The fluoride content of the solutions was assessed with a fluoride sensitive electrode. Fluoride release from all the materials decreased continuously during the experiment, with a significantly higher release in the acidic solution compared to the neutral buffer solution. Fluoridation did not result in an increased fluoride release for the compomers. However, the conventional GIC revealed a significantly higher fluoride release after fluoridation. It is concluded that Dyract® and Compoglass® can not be replenished with fluoride, irrespective of the pH value of the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00413.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Further results concerning exact analytical solutions basic to two-body orbits (1974)
    Springer
    Celestial mechanics and dynamical astronomy 10 (1974), S. 5-15 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Complex-variable techniques are used to establish exact analytical solutions to a class of two-body problems. In view of Lambert's theorem, two points on the conic, the chord-distance between the two points, and the time interval are considered given, and subsequently the solutions for the semi-major axis required to define the orbit are developed and expressed ultimately in terms of elementary quadratures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01261875
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    TheF N method for solving radiative-transfer problems in plane geometry (1978)
    Springer
    Astrophysics and space science 58 (1978), S. 131-137 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheF N method of solving problems in radiative transfer for plane-parallel media with anisotropic scattering is established. The method utilizes properties of the ‘exact’ solution and leads to final equations that are particularly concise and easy to use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645380
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of the single-scattering albedo from polarization measurements of a rayleigh atmosphere (1979)
    Springer
    Astrophysics and space science 60 (1979), S. 237-239 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Exact analysis of a Rayleigh-scattering half space is used to solve the inverse problem whereby the single-scattering albedo can be determined from measurements of the polarized radiation emerging from the atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648256
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    On multi-region problems in radiative transfer (1979)
    Springer
    Astrophysics and space science 62 (1979), S. 225-233 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheF N method is used to solve radiative transfer problems, based on the general anisotropically scattering model, in multi-layer atmospheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643916
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The complete solution for the scattering of polarized light in a Rayleigh and isotropically scattering atmosphere (1980)
    Springer
    Astrophysics and space science 72 (1980), S. 189-201 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheF N method is used to solve, in a concise manner, the complete problem concerning the diffusion of polarized light in a plane-parallel Rayleigh and isotropically scattering atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642178
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Exact analytical solutions basic to a class of two-body orbits (1973)
    Springer
    Celestial mechanics and dynamical astronomy 7 (1973), S. 225-235 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The theory of complex variables is used to establish exact analytical solutions to a class of two-body problems. In view of Lambert's theorem, two points on the conic, the chord-distance between the two points, and the time interval are considered given, and subsequently the solutions for the semi-major axis required to define the orbit are developed and expressed ultimately in terms of elementary quadratures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229949
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    An exact analytical solution of Kepler's equation (1972)
    Springer
    Celestial mechanics and dynamical astronomy 6 (1972), S. 294-304 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Complex-variable analysis is used to develop an exact solution to Kepler's equation, for both elliptic and hyperbolic orbits. The method is based on basic properties of canonical solutions to appropriately posed Riemann problems, and the final results are expressed in terms of elementary quadratures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01231473
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    One-speed transport theory for spherical media with internal sources and incident radiation (1975)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 26 (1975), S. 637-640 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Gegenstand diese Artikels ist eine zeitunabhängige, monoenergetische Neutronentransportgleichung für Medien mit sphärisch symmetrischen Invarianzeigenschaften und isotropem Streugesetz. Die Analysis erlaubt isotrope interne Emission und behandelt das Problem des Neutroneneinfalls auf eine freie Oberfläche eines endlichen sphärischen Mediums.
    Notes: Abstract The time-independent one-speed neutron transport equation for media with spherically symmetric invariance properties and an isotropic scattering law is discussed. The analysis allows for isotropic internal emission, and emphasis is placed on the treatment of neutrons incident on the free surface of a finite spherical medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594038
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    On radiative-transfer problems with reflective boundary conditions and internal emission (1984)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 35 (1984), S. 144-155 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Eine Integral-Transformation und dieF N -Methode werden zur Lösung von grundlegenden Problemen der Strahlungsübertragung herangezogen. Es werden Randbedingungen mit spekulärer und diffuser Reflexion wie auch mit äußerer Bestrahlung benützt, und innere Emission ist zugelassen. Besonders betrachtet werden die Komponenten des gesamten Strahlungsfeldes, welches azimutale Symmetrie besitzt.
    Notes: Abstract An integral-transform technique and theF N method are used to solve basic radiative-transfer problems. Boundary conditions that account for specular and diffuse reflection as well as external illumination are used, and internal emission is allowed. Emphasis is given to the azimuthally symmetric component of the complete radiation field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00947928
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    Paper (German National Licenses)
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