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  • 1
    Electronic Resource
    Electronic Resource
    PERMEABILITY OF AIR AND IMMISCIBLE ORGANIC LIQUIDS IN POROUS MEDIA (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 25 (1989), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The conductivity of air, mineral oil (relative viscosity 77), and a light nontoxic oil (relative viscosity 4.7) was measured in three porous media: a sand, loamy sand, and a silt loam. The measurements were made over a range of water contents for each porous medium. Small volumes of air were present as well as significant amounts of water during most of the oil conductivity measurements. The results were compared to two methods for calculating conductivities of immiscible fluids in water-wet porous media. A new equation that accounts for swelling and for the gas slippage effect in very small pores was formulated for use with these methods The observed conductivities, spanning seven orders of magnitude, agree reasonably well with calculated values. Only three soil parameters are required to calculate the conductivities: (1) the saturated conductivity of water, (2) the saturated conductivity of the immiscible fluid of interest, and (3) a pore size index value that is obtained from an estimate from the water release curve of the porous material. Remediation of organic liquid spills is briefly discussed to illustrate the practical applications of gas phase conductivities, as well as those for immiscible organic liquid phases. It is concluded that, in light of spatial variation under field conditions, the method presented for calculating values of three-phase conductivities will be useful in the management of immiscible organic liquid spills and leaks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1989.tb01333.x
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  • 2
    Electronic Resource
    Electronic Resource
    A method for the separation and estimation of catechol amines in urine (1959)
    Springer
    Cellular and molecular life sciences 15 (1959), S. 80-81 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird eine neue Methode zur Bestimmung der Katecholamine im Harn beschrieben. Die Katecholamine werden im Harn acetyliert und die Acetylderivate papierchromatographisch im Bush-«C»-System getrennt. Nach erfolgter Trennung werden die einzelnen Katecholamine mit Äthylendiamin kondensiert und fluorimetrisch untersucht. Eine Spezifitätserhöhung der Methode durch Anwendung doppelt markierter Isotopen wird in Betracht gezogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02301335
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  • 3
    Electronic Resource
    Electronic Resource
    The metabolism of 3-hydroxytyramine-1-C14 in brain tissue homogenates (1959)
    Springer
    Cellular and molecular life sciences 15 (1959), S. 254-256 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Homogenate aus Gehirn wurden mit 3-Hydroxytyramine-1-C14 inkubiert. Als Stoffwechselprodukt wurde aus der sauren Fraktion radioaktive 3,4-Dioxyphenylessigsäure isoliert. Aus der basischen Fraktion wurden drei radioaktive Zonen papierchromatographisch isoliert. Die erste Zone konnte noch nicht identifiziert werden. Die zweite wurde als 3-Hydroxytyramin und die dritte als 3-Methoxytyramin erkannt. Die mögliche Rolle der Stoffwechselprodukte von 3-Hydroxytyramin beim Parkinson-Syndrom wird diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02158068
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  • 4
    Electronic Resource
    Electronic Resource
    Scaling of the energy gap withT c in Bi2Sr2CaCu2O8+δ (1992)
    Springer
    The European physical journal 87 (1992), S. 271-273 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of a high-resolution photoemission study using synchrotron radiation of two single crystals of Bi2Sr2CaCu2O8+δ, with different critical temperaturesT c due to a variation in oxygen stoichiometry δ are reported. Within experimental accuracy, the energy gap 2Δ is found to scale withT c , amounting to a reduced gap parameter of 2Δ/k BTc≅7.4. Employing resonant photoemission at the O−2s and Cu−3p thresholds, two spectral peaks at binding energies of 180 meV and 320 meV were identified as predominantly O−2p-and Cu−3d 4s-derived states, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309279
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  • 5
    Electronic Resource
    Electronic Resource
    Sulfur coating of urea treated with attapulgite clay (1991)
    Springer
    Nutrient cycling in agroecosystems 28 (1991), S. 123-128 
    Details
    ISSN: 1573-0867
    Keywords: Sulfur coating ; urea ; attapulgite clay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A commercial attapulgite-type gelling clay was added as a conditioning-hardening agent to urea which was then tested as a substrate for sulfur coating. The coating tests were made in bench-scale batch equipment. The total coating weights and the 7-day dissolution rates of the sulfur-coated products were determined and compared with those from similar tests of previously made sulfur-coated urea products containing calcium lignosulfonate or formaldehyde. Compared with urea substrates containing formaldehyde, the urea containing attapulgite clay required about one-third less sulfur coating to attain the same 7-day dissolution rate. The urea containing attapulgite clay and the urea containing calcium lignosulfonate were about equally effective as substrates for sulfur coating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048864
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  • 6
    Electronic Resource
    Electronic Resource
    Long-term trends in NADP/NTN precipitation chemistry data: Results of different statistical analyses (1995)
    Springer
    Water, air & soil pollution 85 (1995), S. 595-601 
    Details
    ISSN: 1573-2932
    Keywords: Long-term trends ; sulfate ; statistical models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper summarizes the results of four statistical approaches for the estimation of long-term trends (1983–92) in sulfate concentration data from 90 monitoring sites across the United States. Least squares regression models and nonparametric techniques were applied to these data. Sulfate concentrations were found to be generally decreasing on the order of 0–4% at most sites. There was general agreement that trends were significant in the Great Lakes, Pacific northwest, and southwest regions. Although strengths and weaknesses are described for each approach, all of these approaches are useful for long-term trend estimation. Visualization techniques are recommended for displaying trend patterns and associated levels of statistical significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00476894
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of water and other dielectrics on crack growth (1982)
    Springer
    Journal of materials science 17 (1982), S. 3460-3478 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Effects of water and a variety of organic liquids on crack-growth rates in soda-lime-silica glass was investigated. When water is present in organic liquids, it is usually the principal agent that promotes subcritical crack growth in glass. In region I, subcritical crack growth is controlled primarily by the chemical potential of the water in the liquid; whereas in region II, crack growth is controlled by the concentration of water and the viscosity of the solution formed by the water and the organic liquid. In region III, where water does not affect crack growth, the slope of the crack-growth curves can be correlated with the dielectric constant of the liquid. It is suggested that these latter results can be explained by electrostatic interactions between the environment and charges that form during the rupture of Si-O bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00752191
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  • 8
    Electronic Resource
    Electronic Resource
    Mössbauer studies of YBa2Cu3O7−δ-type high-T c superconductors (1989)
    Springer
    Hyperfine interactions 50 (1989), S. 555-567 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The local magnetic, electronic, and structural properties of (RE)Ba2Cu3O7−δ supercondcutors (RE=Gd, Dy, and Eu) were studied by Mössbauer spectroscopy using the resonances of155Gd,161Dy,151Eu, and57Eu. In GdBa2Cu3O7−δ, different magnetic ordering behaviors of the Gd sublattice are found for the orthorhombic (superconducting) and tetragonal (non-superconducting) phases. In DyBa2Cu3O7−δ, the magnetic moments of the respective CEF ground states in the orthorhombic and tetragonal phases are derived from paramagnetic hyperfine splittings at 1.4 K. In both DyBa2Cu3O7−δ and EuBa2Cu3O7−δ, anomalies connected with the superconducting transitions in isomer shift, recoil-free fraction, and relaxation behavior were looked for, but not found. The electric-quadrupole splittings observed for both systems are discussed in connection with the lattice EFGs derived for the Gd system. In GdBa2 (Cu0.995Fe0.005)3O7−δ, the local properties of the various Fe sites are investigated over a wide temperature range in both the orthorhombic and tetragonal phase. The magnetic ordering of the Gd sublattice in the orthorhombic phase and of the Cu(2) sublattice in the tetragonal phase, respectively, is monitored via the magnetic splittings at the various Fe sites. Possible assignments of Cu(1) and Cu(2) sites as well as different oxygen configurations around the substituted Fe ions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407691
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  • 9
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    A method for the separation and estimation of catechol amines in urine (1959)
    Springer
    Details
    Publication Date: 1959-02-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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  • 10
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    The metabolism of 3-hydroxytyramine-1-C14 in brain tissue homogenates (1959)
    Springer
    Details
    Publication Date: 1959-07-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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