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  • 1
    Electronic Resource
    Electronic Resource
    Redistribution of sediments in three Swedish lakes (1990)
    Springer
    Hydrobiologia 192 (1990), S. 167-181 
    Details
    ISSN: 1573-5117
    Keywords: fine sediments ; settling sediment traps ; bottom shear ; erosin rate ; suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sedimentation and redistribution of fine sediments in three Swedish lakes of different character have been investigated using settling sediment traps. The bottom shear stress from wind generated waves are calculated and the extension of erodable bottom area is related to wind conditions. Wave induced erosion and deposition during and after cessation of storms in different parts of a lake are discussed theoretically. It is shown that a single one year storm may redistribute more bottom material than the accumulated resuspension caused by frequent but smaller wind events. The settling sediment trap deposition and the concentration of suspended solids are related to the extension of erodable bottom area of particular storms. It is found that in lakes where there are relatively large areas of erosion bottoms, resuspended material from the part of the lake most susceptible to strong winds of large fetch constitutes a major part of the settled material on deep bottoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006012
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative study on the structure of M2Se and M2I+ (M = Ag, Au) using pseudopotentials and full Ab initio methods (1994)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 52 (1994), S. 1-8 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molecules of M2Se and M2I+ (M = Ag, Au) are used as test models to study the quality of the pseudopotential methodology when using the Hartree-Fock and second-order Møller-Plesset methods. We have used two implementations of the Wadt and Hay pseudopotentials: the new large- and small-core pseudopotentials (known as LANL 1DZ and LANL2DZ in GAUSSIAN-92) and the traditional one used for a long time. It is found that the optimum geometry depends on the type of pseudopotential selected. A comparison with the results computed when all the electrons are taken explicitly into account shows that the new LANL1DZ and LANL2DZ give the right answer. Using these potentials, the geometry and potential energy surface of the M2Se and M2I+ systems is explored and its optimum geometry found. © 1994 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560520102
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  • 3
    Electronic Resource
    Electronic Resource
    Der erste Polyiodokomplex - Triethylsulfoniumtriiodomercurat(II)-tris(diiod), (Et3S)[Hg2I6]1/2 · 3 I2 (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 165-170 
    Details
    ISSN: 0044-2313
    Keywords: Crystal structure ; mercury complex ; Raman spectroscopy ; triethylsulfonium ion ; polyiodide ; iodine bridges ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First Polyiodo Complex - Triethylsulfoniumtriiodomercurate(II)-tris(diiodine), (Et3S)[Hg2I6]1/2 · 3 I2After Raman spectroscopic investigation of the system HgI2/Et3SIx, x = 3, 5, 7, triethylsulfoniumtriiodomercuratetris(diiodine), (Et3S)[Hg2I6]1/2 · 3 I2 was synthesized by reacting of HgI2 and liquid Et3SI7. The compound crystallizes at room temperature triclinically in the space group P1 with a = 879.4(7), b = 1 209.1(5), c = 1 291.5(5) pm, α = 96.16(3)°, β = 103.82(6)°, γ = 99.05(5)° and Z = 2. The crystal structure is composed of disordered Et3S+ cations, the centrosymmetric complex anion [HgI2/2I2]22- and three connecting iodine molecules I2.
    Notes: Nach Raman-spektroskopischer Untersuchung des Systems HgI2/Et3SIx, x = 3, 5, 7, wurde die neue Verbindung Triethylsulfoniumtriiodomercurat-tris(diiod), (Et3S) · [Hg2I6]1/2 · 3 I2, durch Umsetzung von HgI2 mit flüssigem Et3SI7 dargestellt und strukturell charakterisiert. Sie kristallisiert bei Raumtemperatur in der triklinen Raumgruppe P1 mit a = 879,4(7), b = 1 209,1(5), c = 1 291,5(5) pm, α = 96,16(3)°, β = 103,82(6)°, γ = 99,05(5)° und Z = 2. Die Kristallstruktur wird aus dem fehlgeordneten Kation Et3S+, einem aus zwei kantenverknüpften Tetraedern [HgI2/2I2]22- der Symmetrie i und drei I2 aufgebaut, welche die Anionen über die nicht verbrückenden Iodid-Liganden vernetzen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210130
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