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  • Articles  (15,850)
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  • 1
    Electronic Resource
    Electronic Resource
    A numerical study of the effects of a large Sandbar upon Sea Breeze development (1985)
    Springer
    Meteorology and atmospheric physics 34 (1985), S. 3-26 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Die zweidimensionale, numerische Simulierung der Seebrisenentwicklung über einer großen Sandbank an der Nordseeküste Deutschlands wird beschrieben. Das hier angewandte Modell enthält eine detaillierte Behandlung der Bodenfeuchte, welche eine Auswertung des Effektes differenzierter Oberflächencharakteristika auf die Luftströmung erlaubt. Rechnungsresultate zeigen, daß der Kontrast zwischen Sandbank und benachbartem, trockenem Land, die gezeitenbewirkte Überflutung der Sandbank und die nach Osten vorrückende Seebrise der Ostsee eine wichtige Rolle in der Entwicklung von mesoskalaren Strömungsverteilungen im Gebiet der Sandbank spielen.
    Notes: Summary Two-dimensional numerical simulations of sea breeze development over a large sandbar on the North Sea coast of Germany are reported. The numerical model used in these experiments contains a detailed treatment of soil moisture, which allows evaluation of the effects of differential surface characteristics on the airflow pattern. Results of the simulations indicate that the contrast between the moist sandbar and adjacent dry land, the tidal inundation of the sandbar, and the westward penetration of the Baltic sea breeze play important roles in the development of mesoscale airflow patterns in the sandbar region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267392
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of the molecular conformation and rotational disorder in crystalline ferrocene and nickelocene (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 1-17 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Ferrocene and nickelocene have pseudo-isomorphous structures at room temperature but only ferrocene undergoes a second-order phase transformation on cooling. Calculation and analysis of appropriate lattice-energy surfaces as a function of concerted ring rotation showed that ferrocene has a disordered structure at room temperature different from nickelocene which exhibits a single minimum in the lattice-energy function. The results readily suggest a mechanism for the ferrocene phase transformation. The correct low-temperature structure is predicted only after taking intramolecular interactions into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185712
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of (1,2-diaminoethane) (1-[[2-[(2-aminoethyl)imino]propyl]thio]-2-propanone)nickel(II) nitrate (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 19-27 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A single crystal X-ray investigation of the purple nickel (II) complex Ni[L(en)](NO3)2, produced by condensation of 1,2-diaminoethane (en) with the thiodiketone S(CH2COCH3)2 in the presence of nickel (II) nitrate (L is NH2(CH2)2N=C(CH3)CH2SCH2COCH3), shows that the metal ions are six coordinate. The new ligand L is tetradentate, with the N,N and S donor atoms arranged meridionally, and the coordination shell completed by the carbonyl oxygen atom of L and the nitrogen atoms of 1,2-diaminoethane. Metal-ligand bond distances are Ni-N: 2.08 av. (en), 2.10 and 2.05 (NH2 and N=C respectively of L); Ni-O, 2.16; Ni-S, 2.45 Å. There is considerable angular distortion from regular octahedral values of the bond angles at nickel. The crystals are monoclinic,P21/c (No. 14),a=12.433(2),b=11.709(1),c=13.150(2) Å,β=103.93(1)°,V c=1858.2(4) Å3. The structure was solved by the heavy-atom method and refined by full-matrix least squares to anR value of 0.055 for 3633 reflections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185713
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal structure of bis(potassium hydrogenl-malate)·malic acid, 2[K+(C4H5O5)]·C4H6O5 (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 45-52 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of bis(potassium hydrogenl-malate)·malic acid, 2[K+(C4H5O5)−]·C4H6O5, has been determined: C12H16K2O15, M r =1913.9, orthorhombic, space groupP212121 a=7.719(5),b=7.916(5),c=29.863(20) Å,V c=1824.7 Å3,Z=4. The structure was determined by a new application of theDirdif procedure using MoKα automatic diffractometer X-ray data, and refined by full-matrix least squares toR=0.059 for 962 reflections. A question on space-group assignment and composition was resolved only after the structure had been determined. The conformation of the central carbon skeleton of all three crystallographic independent malate moieties isanti. The potassium ions are coordinated by eight oxygen atoms, forming face-sharing distorted square antiprisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185716
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  • 5
    Electronic Resource
    Electronic Resource
    Studies of systemic acylanilide fungicides. Part I. Crystal structure and molecular conformation ofdl-methyl-N-(2,6-dimethylphenyl)-N-(2-methoxyacetyl) alaninate (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 61-71 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of metalaxyl (C15H21NO4) was determined by three-dimensional X-ray analysis from diffractometer data. The crystals are monoclinic,P21/c,a=7.851(3) Å,b=13.119(10) Å,c=15.107(7) Å,β=101.71(6)°,Z=4,D x=1.218 g cm−3, μ (MoKa)=0.095 mm−1. FinalR=0.079 for 1203 observed reflections. The dimethylphenyl ring is almost perpendicular to the amidic plane of the molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185718
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  • 6
    Electronic Resource
    Electronic Resource
    3′-phenyl dispiro(fluorene-9,4′-[1,2]thiazole-5′,9″-fluorene)-1′,1′-dioxide (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 89-94 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185720
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  • 7
    Electronic Resource
    Electronic Resource
    Conformations of saturated and unsaturated δ-lactone rings (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 115-131 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The various conformations of δ-lactone rings are described and parametrized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01181800
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal structure of methylgermanium triiodide (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 39-43 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structure of MeGeI3 is orthorhombic with space groupPnma,a=6.374(3),b=10.412(4),c=12.683(4) Å, andz=4. It has been solved by direct methods and refined by full-matrix least-squares techniques to a conventionalR factor of 0.0791 for 653 unique reflections. The crystal structure contains discrete molecules with mirror symmetry which are separated by normal van der Waals distances. The mean Ge-I distance is 2.500(2) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185715
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  • 9
    Electronic Resource
    Electronic Resource
    An oxovanadium(IV) complex containing a pentacoordinate Schiff-base ligand: synthesis and crystal and molecular structure of N,N′-(3,3′-dipropylamine)bis (3-methoxysalicylideneiminato)oxovanadium(IV) dihydrate (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 29-38 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Crystals ofN,N′-(3,3′-dipropylamine)bis(3-methoxysalicylideneiminato) oxovanadium(IV) dihydrate are monoclinic, space groupP21/n (No. 14) with four molecules in the unit cell of dimensionsa=8.667(4),b=20.617(4),c=12.744(3) Å,β=91.48(3)°. The structure was solved by the heavy-atom method and refined by block diagonal least-squares calculations with anisotropic thermal parameters for nonhydrogen atoms.R=0.038 for 1457 reflections withI〉3σ(I). This structure is the first reported for an oxovanadium(IV) complex involving complexation of a pentacoordinate Schiff-base ligand. The coordination polyhedron is based on a distorted octahedron. Three nitrogen and one oxygen atom from the ligand form an equatorial plane around vanadium with V-N(1) 2.096(4), V-N(2) 2.180(4), V-N(3) 2.088(4), V-O(2) 1.961(3) Å, and octahedral coordination is completed by the vanadyl oxygen [V-O(1) 1.617(3) Å] and the remaining ligand oxygen [V-O(3) 2,098(3) Å]. The relatively long V-O(1) distance correlates well with the low value ofv(V=O) of 919 cm−1. The molecules of the complex are linked by water molecules of crystallization to form infinite hydrogen-bonded chains parallel toa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185714
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  • 10
    Electronic Resource
    Electronic Resource
    The structures of three trimethylarsine-boron trihalide adducts: (CH3)3AsBCl3, (CH3)3AsBBr3, and (CH3)3AsBI3 (1985)
    Springer
    Journal of chemical crystallography 15 (1985), S. 53-60 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An X-ray structure analysis of three trimethylarsine-boron trihalide adducts has been undertaken. Crystals of (CH3)3AsBCl3 and (CH3)3AsBBr3 are monoclinic with space groupP21/m (No. 11) withZ=2 while those of (CH3)3AsBI3 are orthorhombic with space groupPnma (No. 62) withZ=4. For (CH3)3AsBCl3,a=6.497(3) Å,b=10.735(3) Å,c=7.070(2) Å,β=111.8(3)°,V=458.4(3) Å3,R=0.0343. For (CH3)3AsBBr3,a=6.672(4) Å,b=11.135(7) Å,c=7.199(4) Å,β=111.5(1)°,V=497.7(5) Å3,R=0.0434. For (CH3)3ÅsBI3,a=13.113(7) Å,b=11.733(5) Å,c=7.387(3) Å,V=1136.5(5) Å3,R=0.0329. The As-B bond lengths are 2.065(6), 2.04(1), and 2.03(1) Å, respectively, for the chloride, bromide, and iodide. These and other structural parameters are discussed with reference to previous predictions based on vibrational spectra and previous structural studies on the trimethyl-phosphine and trimethylamine adducts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185717
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