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  • 1985-1989  (3)
  • 1950-1954
  • 25.85  (2)
  • nodule  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of zirconium concentration on nodule formation during cyclic oxidation of Fe-15Cr-4Al alloy at 1300°C (1988)
    Springer
    Oxidation of metals 29 (1988), S. 1-21 
    Details
    ISSN: 1573-4889
    Keywords: Cyclic oxidation ; nodule ; oxidation resistance ; nodular growth ; wart
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of small concentrations of zirconium on the cyclic oxidation behavior of Fe-15Cr-4Al was investigated at 1300°C. The zirconium concentrations studied were 0.2, 0.55, and 1 wt.%. Each cycle consisted of a 1-hr isothermal period followed by 30-min cooling of the sample in air. Nodule formation was observed in higher zirconium-containing alloys, 0.55% and 1% zirconium, and the base alloy. The nodules formed at the corners and edges of the specimen and grew with increasing number of cycles. EDAX and line scans of cross section of oxidized samples demonstrated that the nodules were composed of iron oxides. Suggestions are given regarding the mode of nodule formation. Results show that additions of 0.2% zirconium and 1% yttrium to the base alloy suppress the nodule formation and provide the best resistance to cyclic oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656347
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of collective rotational degrees of freedom in medium energy fission (1988)
    Springer
    The European physical journal 330 (1988), S. 103-109 
    Details
    ISSN: 1434-601X
    Keywords: 25.85
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present work rms angular momenta have been deduced for the fission fragments corresponding to131Tem,g and133Tem,g in232Th(α 40 MeV,f) and238U(α 40 MeV,f) systems from the radiochemically determined independent isomeric yield ratios and statistical model based analysis. For131Te and133Te the rms angular momenta deduced are 5.9±1.0 and 7.9±1.2 ħ respectively in232Th(α 40 MeV,f) and 7.2±0.6 and 8.0±0.8 ħ respectively in238U(α 40 MeV,f). Comparison of the present data with the literature data for these fragments in the same compound nuclei236U* and242Pu* at lower excitation energies shows increase in the fragment angular momentum with increasing excitation energy and angular momenta of the fissioning nuclei. Fragment angular momentum deduced theoretically for asymmetric and deformed fragments on the basis of thermal equilibration of the collective rotational degrees e.g., rigid rotation, wriggling, tilting, bending and twisting modes considering the effect of multichance fission, are in good agreement with the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287271
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Correlations of fission fragment angular momentum with collective and intrinsic degrees of freedom (1988)
    Springer
    The European physical journal 331 (1988), S. 335-342 
    Details
    ISSN: 1434-601X
    Keywords: 25.85
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present work angular momenta of the fragments corresponding to132Im,g have been deduced from the radiochemically determined independent isomeric yield ratios and statistical model based analysis in neutron induced fission of235U,239Pu and245Cm and spontaneous fission of252Cf. These data along with similar data on134I, reported earlier from this laboratory, bring out the effects of deformed 66n and spherical 82n shells on fragment angular momentum showing also an inverse correlation of the latter with elemental yields. Quantitative estimates of fragment scission point deformation and the coefficient of change of fragment angular momentum with kinetic/excitation energy have been deduced and are seen to be in good agreement with the expected theoretical estimates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01355605
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    Paper (German National Licenses)
    Fulltext
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