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  • 1
    Electronic Resource
    Electronic Resource
    Elastic constants of acenaphthene determined from studies of thermal diffuse scattering of X-rays (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 645-649 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The absolute values of all the nine elastic constants of acenaphthene single crystals, C12H10, belonging to the orthorhombic system, have been determined by the photographic method from the measurement of the intensities of thermal diffuse scattering observed in a series of Laue photographs taken with monochromatized Cu Kα radiation having no higher harmonics of λKα. The direct beam was recorded photographically after being absorbed through nickel foils of known thickness, its intensity being reduced by a factor of 106. Diffuse scattering domains near the reciprocal-lattice nodes 400, 080, 004, 105, 014 and 072 were investigated extensively. The diffusely scattered intensities were corrected for the general scattering, polarization and skew factors. Corrections for absorption, divergence and second-order diffuse scattering were found negligible. The values of the elastic constants in units of GN m-2, with e.s.d.'s in parentheses, are C11 = 11.05 (50); C22 = 10.26 (30); C33 = 9.40 (23); C44 = 4.25 (08); C55 = 3.69 (07); C66 = 4.87 (10); C12 = -1.93 (20); C13 = 3.34 (12); C23 = 2.34 (13). The accuracy of experimentally determined values of the elastic constants is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481001472
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization, preliminary X-ray analysis of a native and selenomethionine D-hydantoinase from Thermus sp. (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1166-1169 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A D-hydantoinase from Thermus sp. was expressed in Escherichia coli, purified to homogeneity and crystallized both as native and Se-Met labelled protein. The crystals belong to the orthorhombic space group C2221, with unit-cell parameters a = 125.9, b = 215.8, c = 207.5 Å. A three-wavelength MAD data set was collected to 2.5 Å resolution and a native data set was collected to 1.7 Å resolution. Crystal packing and self-rotation calculations led to the assumption of six protomers per asymmetric unit, corresponding to a VM value of 2.28 Å3 Da−1 and a solvent content of 46%. As each protomer contains nine Se-Met residues, 54 selenium sites per asymmetric unit were present and could be unambigously located in the course of the MAD experiment. This selenium substructure is one of the largest selenium substructures that have been solved to date. The resulting phases obtained at a high-resolution limit of 3.0 Å could be extended to 1.7 Å and refined by application of density-modification techniques, especially non-crystallographic symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444900004935
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  • 3
    Electronic Resource
    Electronic Resource
    Physics of modern materials. Vols. 1 and 2 edited by M. Lewis (1982)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 877-877 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739482001843
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of 5-amino-1-diphenylmethylimidazole-4-carboxamide (1991)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 804-807 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270190008447
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  • 5
    Electronic Resource
    Electronic Resource
    Lattice parameters of some binary and ternary copper alloys (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 492-493 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Lattice parameters of some binary and ternary alloys of copper, aluminium, cadmium, indium and tin are given, based on X-ray powder diffraction measurments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875011041
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  • 6
    Electronic Resource
    Electronic Resource
    Microstructural transformation of vanadium pentoxide powder obtained by high-energy vibrational ball-milling (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 34 (2001), S. 381-385 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An X-ray powder profile analysis of vanadium pentoxide powder milled in a high-energy vibrational ball-mill is presented. The strain- and size-induced broadening of the Bragg reflection for two different crystallographic directions ([001] and [100]) were determined by Warren–Averbach (WA) analysis, using a pattern-decomposition method assuming a pseudo-Voigt function. The deformation process causes a decrease in the domain size, and a near isotropic saturation value of ∼10 nm is reached after severe milling. The initial stages of milling produce a propensity for size broadening, whereas, with increasing milling time, microstrain broadening is predominant. WA analysis indicated significant plastic strain along with spatial confinement of the internal strain fields, probably in the crystallite interfaces. Transmission electron microscopy revealed a drastic change in particle shape after 64 h of milling, indicating the existence of size anisotropy which, however, decreased with further increase of the milling time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889801004009
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructural investigation of plastically deformed Pb(1−x)Snx alloys: an X-ray profile-fitting approach (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 32 (1999), S. 1060-1068 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A detailed X-ray line-profile analysis is presented on five compositions of Pb–Sn alloys in the face-centred cubic (f.c.c.) α phase. Analysis has been performed within the framework of the Warren–Averbach method and the Williamson–Hall method through a profile-fitting algorithm assuming a pseudo-Voigt (pV) profile shape function convoluted with an asymmetric function. The effect of cold-working on the alloys is analysed in terms of defect-related parameters and defect distribution. The alloys decompose beyond the composition Pb–13.2 at.% Sn. Cold-working produces very weak structural broadening in Pb–Sn alloys, along with negligible incidence of deformation-fault probability. However, the presence of the Sn-rich β phase enhances the fault probability. The plot of \ln \langle \varepsilon^2\rangle^{1/2} versus \ln L is a straight line and the slope is around −0.26 to −0.43, indicating that the strain-broadened profile is intermediate between a Gaussian and a Lorentzian profile. The origin of the `hook' effect in the size Fourier plot is attributed to non-Gaussian strain distribution or strain gradients in the diffracting columns. The effect of recovery is noticeable and is probably due to polygonization. Furthermore, the rate of recovery is greater in Pb–Sn alloys compared to Pb–Sb alloys for identical solute concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889899010286
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  • 8
    Electronic Resource
    Electronic Resource
    Structure of 5-chloro-3-hydroxy-3-methyl-2(3H)-indolone, C9H8ClNO2 (1985)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 1363-1364 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270185007788
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  • 9
    Electronic Resource
    Electronic Resource
    Aqua[1,9-di(2-pyridyl)-2,5,8-triazanonane]cobalt(III) nitrate diperchlorate (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 1866-1869 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187089819
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  • 10
    Electronic Resource
    Electronic Resource
    3-Nitro-4-hydroxyphenylarsonic acid (1977)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 3593-3595 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740877011601
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