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  • Articles: DFG German National Licenses  (10)
  • 2000-2004  (1)
  • 1995-1999  (5)
  • 1985-1989  (3)
  • 1920-1924  (1)
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  • Articles: DFG German National Licenses  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Gas-phase reactivity of the formyl radical with unsaturated hydrocarbons: an experimental and theoretical study (1986)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 108 (1986), S. 3872-3879 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00274a002
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structural Investigation of P4W24O80: A New Monophosphate Tungsten Bronze (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 365-375 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystallographic study of the tungsten phosphate bronze P4W24O80 was performed from three-dimensional single-crystal X-ray diffraction data and electron microscopy. This compound crystallizes in the orthorhombic system with unit-cell dimensions a = 5.312 (1), b = 6.5557 (8), c = 42.196 (8) Å and space group P212121. The crystal structure was solved by direct methods and Fourier techniques, and refined to the reliability factor R = 0.0284 (wR = 0.0272). Its determination confirms that it belongs to the monophosphate tungsten bronze family of the general formula (PO2)4(WO3)2m with the value m = 12. Large empty cages surrounded by 18 O atoms are built up of eight WO6 octahedra and four PO4 tetrahedra sharing corners. They are located between two WO3-type slabs forming pentagonal-shaped tunnels running in the a direction. Electron microscopy investigations confirm that the studied crystal does not imply modulation phenomena when other crystals of the same composition exhibit satellite reflections with a modulation vector q* involving a doubling of a. The observations also reveal the existence of a monoclinic form of the m = 12 compound, which is a regular intergrowth of m = 11 and m = 13 members in a similar way to the m = 5 member of the series where the same feature has already been observed. On each edge of a WO3-type slab, a large variation (from 1.73 to 2.09 Å) of the six W—O distances within the WO6 octahedron is noted, which yields an oxidation state of W near 6, whereas for the WO6 octahedra located in the middle part of the slab the six W—O distances are gathered about their mean value (1.92 Å), which involves a more important electronic delocalization. The thermal motion of the W atoms is described. The absolute structural configuration is tested on the basis of some calculated structure factors, which are more sensitive to the x, y, z → −x, −y, −z change of atomic positions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768197013785
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cluster configurations in modulated EuVxMo8±yO14 crystals (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 467-483 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Three orthorhombic crystals of chemical formula EuxVyMo8±zO14 were investigated by X-ray diffraction (Mo Kα radiation, λ = 0.71073 Å). They have nearly the same lattice parameters (a ∼ 11.3, b ∼ 10.0, c ∼ 9.2 Å), display one-dimensional incommensurate modulations of wavevector q* = γc* and are characterized by the same superspace group Cmca(00γ)s00. The crystals differ both in their compositions (namely Eu0.976(6)V1.13(5)Mo7.10(5)O14, Eu0.986(4)V1.10(3)Mo7.30(1)O14 and EuMo7.96(1)O14) and in their γ components [0.195 (2), 0.245 (2) and 0.286 (3), respectively]. The average structures of these crystals appear closely related to the structures of LaMo7.7O14 (not modulated) and LaMo8O14 (modulated); however, two main differences are outlined: first, the modulation direction is c in the Eu-containing crystals but b in the modulated La-containing crystal [q* = (1/3)b*], second, the Eu-containing crystals have centrosymmetric structures while the La-containing crystals have polar structures (space group C2ca). The Mo (or Mo and V) atoms are stacked to form (001) layers of metallic clusters. The density modulation of these structures implies the existence of the new types of clusters Mo9, Mo10, Mo6V4, Mo7V3 and Mo8V2 besides the clusters M8 (Mo8, Mo6V2 and Mo7V) and M7 (Mo7 and Mo6V) which are already known. Mo8 units with cis and trans configurations and Mo6V2 units with a trans configuration appear as the main cluster types in these crystals. The nature of the metallic clusters changes along c, but inside one (001) layer it is likely that only one cluster type with a given configuration is present. The main structural result is the formation, in some unit cells, of strong intercluster Mo—Mo, Mo—V or V—V bonds with distances close to 2.6 Å within a layer as well as between two neighbouring layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768199000452
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  • 4
    Electronic Resource
    Electronic Resource
    Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 603-632 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Phosphate tungsten bronzes have been shown to be conductors of low dimensionality. A review of the crystallographic and structural properties of this huge series of compounds is given here, corresponding to the present knowledge of the different X-ray studies and electron microscopy investigations. Three main families are described, monophosphate tungsten bronzes, Ax(PO2)4(WO3)2m, either with pentagonal tunnels (MPTBp) or with hexagonal tunnels (MPTBh), and diphosphate tungsten bronzes, Ax(P2O4)2(WO3)2m, mainly with hexagonal tunnels (DPTBh). The general aspect of these crystal structures may be described as a building of polyhedra sharing oxygen corners made of regular stacking of WO3-type slabs with a thickness function of m, joined by slices of tetrahedral PO4 phosphate or P2O7 diphosphate groups. The relations of the different slabs with respect to the basic perovskite structure are mentioned. The structural description is focused on the tilt phenomenon of the WO6 octahedra inside a slab of WO3-type. In this respect, a comparison with the different phases of the WO3 crystal structures is established. The various modes of tilting and the different possible connections between two adjacent WO3-type slabs involve a great variety of structures with different symmetries, as well as the existence of numerous twins in MPTBp's. Several phase transitions, with the appearance of diffuse scattering and modulation phenomena, were analysed by X-ray scattering measurements and through the temperature dependence of various physical properties for the MPTBp's. The role of the W displacements within the WO3-type slabs, in two modulated structures (m = 4 and m = 10), already solved, is discussed. Finally, the complexity of the structural aspects of DPTBh's is explained on the basis of the average structures which are the only ones solved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768101009685
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of the147Gd mass excess by the (12C,9Be) reaction (1985)
    Springer
    The European physical journal 321 (1985), S. 435-438 
    Details
    ISSN: 1434-601X
    Keywords: 21.10 Dr ; 25.70−z ; 27.60+j A=147
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mass excess of the147Gd nucleus was measured from the144Sm(12C,9Be)147Gd reaction using the 72 MeV12C beam of the Orsay MP Tandem and the “Bacchus” magnetic spectrometer. The measurement is auto-calibrated by the10Be spectrum from the144Sm(12C,10Be) reaction. The derived value of the mass excess of147Gd is −75.401±0.025 MeV. It is compared with other recent results and with calculated values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411976
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  • 6
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    Unknown
    Remarques sur les "Suppliantes et le Prométhée" d'Eschyle (1920)
    Paris : Periodicals Archive Online (PAO)
    Revue de philologie, de littérature et d'histoire anciennes. n.s.:44:3 (1920:juil.) 241 
    Details
    ISSN: 0035-1652
    Topics: Classical Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:p232-1920-044-03-000003
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  • 7
    Electronic Resource
    Electronic Resource
    Confirmation of linkage disequilibrium between haplotype B (XV-2c, allele 1; KM-19, allele 2) and cystic fibrosis allele in the French population (1989)
    Springer
    Human genetics 〈Berlin〉 81 (1989), S. 183-184 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In 237 French families with cystic fibrosis (CF) restricted fragment length polymorphisms (RFLPs) were detected by two DNa probes, XV-2c and KM-19, which are tightly linked to the CF allele. As in other European populations linkage disequilibrium is found between the haplotype B (XV-2c, allele 1: KM-19, allele 2) and the CF allele. Linkage disequilibrium alters the probability that a person bearing a given haplotype is a carrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293899
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  • 8
    Electronic Resource
    Electronic Resource
    Is there any difference between daytime and nighttime debrisoquine metabolism? (1997)
    Springer
    European journal of clinical pharmacology 52 (1997), S. 419-420 
    Details
    ISSN: 1432-1041
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002280050313
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  • 9
    Electronic Resource
    Electronic Resource
    International field intercomparison of atmospheric mercury measurement methods (1995)
    Springer
    Water, air & soil pollution 80 (1995), S. 611-620 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract To determine the extent of comparability of sampling and analytical procedures for atmospheric mercury (Hg) being used by different scientific groups around the world and hence the compatibility of measurement results, the Atmospheric Environment Service (AES) co-ordinated a field intercomparison study in Windsor, Ontario, over a period of 5 days- during Sept./Oct.,1993. This study brought together 2 groups (University of Michigan Air Quality Laboratory; Chemistry Institute of GKSS) which performed conventional (manual) sample collection procedures for total gaseous mercury (TGM) and for particulate-phase mercury (PPM), followed by cold-vapor atomic fluorescence spectrophotometric (CVAFS) analysis in the respective laboratories. Two other groups (Ontario Hydro, and the Ontario Ministry of Environment & Energy) each operated a novel mercury vapor analyzer produced by Tekran Inc. of Toronto. As is the case for the manual methods, this analyzer also uses gold amalgamation and CVAFS. During the intercomparison, meteorological parameters (air temperature, barometric pressure, wind speed/direction and relative humidity) were obtained at the study site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189713
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  • 10
    Electronic Resource
    Electronic Resource
    Structural investigation of a new variety of the low dimensional conductor with 2 m = 5 + 5: P 4 W 10 O 38 (1999)
    Springer
    The European physical journal 12 (1999), S. 497-508 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.10.-i X-ray diffraction and scattering – 61.14.-x Electron diffraction and scattering – 71.45.Lr Charge-density-wave systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A new variety of P 4 W 10 O 38 , m = 5 member of the monophosphate tungsten-bronze family with pentagonal tunnels (MPTB p), , has been isolated and studied by X-ray diffraction measurements. The structure has been solved by direct methods from single crystal X-ray data. The monoclinic unit cell corresponds to a regular stacking of WO 3 -type slabs which are all five-WO 6 -octahedra thick and connected through PO 4 tetrahedra. This structure is comparable to that previously described for the MPTB p'series with m = 4 (P 4 W 8 O 32 ) and m = 6 (P 4 W 12 O 44 ). An X-ray diffuse scattering investigation has revealed that this member is subjected to charge density wave instabilities (CDW) located on chains running along the directions. Two CDW transitions have been observed at and , bearing some resemblance with those exhibited by the m = 4 member. The corresponding modulation wave vectors can be accounted for by a hidden nesting mechanism which connects the crossing points of differently oriented quasi-planar Fermi surfaces, as found for the low m (4 and 6) members of the MPTB's.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510051031
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