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  • 1
    Digitale Medien
    Digitale Medien
    Multiple octupole excitations in Gd (2000)
    Springer
    The European physical journal 8 (2000), S. 147-151 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS 23.20.Lv Gamma transitions and level energies – 21.10.Lg Lifetimes – 27.60.+j 90≤A≤149
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The lifetime and the -decay to the 0+ ground state of the lowest 3- state in 148Gd has been determined. The reduced strength B(E3, 3- 0+)=41 (6) W.u. agrees well with the theoretical value from empirical shell model calculations and can be directly compared with the 12+ 9- two-octupole-phonon one-octupole-phonon strength obtained in the same Recoil Distance Method lifetime measurement. The results of our search for a three octupole-phonon state built on the state is also reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500070099
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  • 2
    Digitale Medien
    Digitale Medien
    Lifetime measurements in 148Gd (2003)
    Springer
    The European physical journal 17 (2003), S. 29-36 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS. 21.10.Tg Lifetimes – 21.10.Ky Electromagnetic moments – 27.60.+j 90 ⩽ A ⩽ 149
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Lifetimes of excited states in 148Gd were measured using the recoil distance method with a plunger device coupled to the EUROBALL Ge detector array. The differential decay curve method in coincidence mode allowed the unambiguous determination of lifetimes of more than 20 excited states. The obtained transition strengths are in good agreement with the shell model calculations. The effect of the Z = 64 subshell closure on the B(E2 : 2+ → 0+) reduced strengths above the N = 82 magic number is discussed.-1
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epja/i2002-10144-3
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  • 3
    Digitale Medien
    Digitale Medien
    Preparation of C-fibre borosilicate glass composites: Influence of the fibre distribution on mechanical properties (1994)
    Springer
    Journal of materials science 29 (1994), S. 3469-3476 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Optimum conditions with respect to preparation-determined fibre distribution in borosilicate glass composites were investigated. Continuous C-fibre bundles were impregnated with glass powder in silicon alkoxide solution and wound in parallel to prepregs which were hot pressed into unidirectional composites. The influence of the glass particle size during the impregnation of fibre bundles and during hot pressing on the homogeneity of the fibre distribution was of special interest, as well as the influence of pressure and temperature on the densification of the composites. Optimum conditions were related to optimum values in the bending strength of the resulting composites. Under the optimum hot-pressing conditions the fibre volume content was varied. It has been shown that the fibre distribution was much more homogeneous when fine-grained glass powder was used for impregnation. At high fibre volume concentrations of the composites the distribution was better than at low concentrations. High fibre concentrations were connected with fracture toughness of the sample, as shown by the three-point bending experiments, whereas samples with low C-fibre concentration showed brittle behaviour.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00352051
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  • 4
    Digitale Medien
    Digitale Medien
    Preparation of C-fibre borosilicate glass composites: Influence of the fibre type on mechanical properties (1994)
    Springer
    Journal of materials science 29 (1994), S. 4013-4021 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Nine different types of carbon fibres were used as the reinforcement component of the borosilicate glass DURAN. Optimum preparation procedures and parameters for the resulting composites were investigated, the mechanical properties were measured in the bending test, and the results compared. It was found that the densification of composites incorporated with high-modulus (hm) C-fibres could be done at lower temperatures than that of composites with high-strength (hs) C-fibres. The utilization of the fibres in the composites with respect to the tensile strength of the fibres was much better for the hm-C-fibres than for the hs-C-fibres. The experimentally obtained values for Young's modulus and the bending strength of the composites were compared with those calculated from the linear mixing rule (LMR). The measured bendover stresses (stress limit of the elastic region in the stress-strain diagrams) were compared with those from the Aveston-Cooper-Kelly model, which calculates stresses at which cracks in the glass matrix occur. It has been shown that good agreement between experimental and calculated values was found if relatively large values were assumed for the interfacial shear strength.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00355963
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