Rapor

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https://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/3

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Browsing Rapor by Publisher "T.A.E.C. Çekmece Nuclear Research And Training Center"

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    A study of the structure change of water by measuring the sound velocity
    (T.A.E.C. Çekmece Nuclear Research And Training Center, 1968-06) Yazgan, Ertuğrul; TAEK-ÇNAEM
    The sound velocity has been measured in twice distilled water between 1-40°C with 0.5°C temperature intervals. The differences between the calculated velocities using a fifth degree polinom which was obtained by a computer and the measured velocities were plotted as a function temperature. It was noticed that at some temperatures this curve has not a random distribution character. The investigations showed that, at same temperatures Qurashi and Ahsanullah observed a series of discrete jumps in the activation energy of viscous flow of water, and Ahsanullah found discontinuities in the thermal expansion of water. The relationships among those three phenomens were investigated.
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    Time eigenvalues of the neutron - transport equation for fast, subcritical assemblies
    (T.A.E.C. Çekmece Nuclear Research And Training Center, 1973) Adalıoğlu, Ulvi; Duderstadt, J. J.; TAEK-ÇNAEM
    The time decay constants characterizing the time behavior of a neutron pulse in a subcritical fast assembly are investigated by analyzing the time- eigenvalue spectrum of the transport operator for fast neutrons. To simplify this analysis, isotropic scattering was assumed, and a simple model of inelastic scattering was employed. By applying the techniques of functional analysis familiar from the study of the time-eigenvalue problem for thermal neutrons, it has been possible to classify the spectrum of the transport operator into the usual band spectrum for Re{s} ≤- λ*, where λ* is the minimum collision frequency, and a point spectrum in the region Re{s} > - λ* . It was demonstrated that this point spectrum was void for either sufficiently small assembly sizes or sufficiently small concentrations of fissile material.