Rapor

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

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    Derivation de I'equation de nordheim a partır de I'equation de diffusion
    (T.A.E.C. Çekmece Nuclear Research Center, 1963) Özemre, Ahmet Yüksel; TAEK-ÇNAEM
    Bu makalede Nordheim denklemi, sâdece çoğaltkan bir ortamın ılık nötronlarının difüzyon denklemine dayanılarak çıkartılmaktadır. Bu, farklı m grup gecikmiş nötronun ortamın nötron bilançosuna iştiraklerini uygun bir tarzda ifâde eden bir kaynak teriminin difüzyon denklemine ilâvesiyle gerçekleştirilmiştir. Nordheim denklemini elde etmek için tek bir diferansiyel denklemin göz önüne alınmış olması, şimdiye kadar tatbik edilmekte olan ve ılık nötronların difüzyon denkleminden ve aynı zamanda gecikmiş nötron neşreden fisyon ürünü ana çekirdeklerin yoğunluklarını veren m adet küple denklemden faydalanma esâsına dayanan metoda nisbetle âşikâr olarak mühim bir sâdelik arzetmektedir.
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    Isotopic and isotonic yields in nuclear fission
    (T.A.E.C. Çekmece Nuclear Research Center, 1962) Erben, M. Talat; Güven, Binay; TAEK-ÇNAEM
    The curves for isotopic and isotonic fission yields are calculated and shown to be the Weierstrass transforms of the isoboaric yield curve. The Well-known mass asymmetry of the fission is associated with asymmetry in charge and in neutron contents. There are "forbidden" zones at 44 Z 48 and at 64 N 78, where formation probabilities are extremely low. The distribution of the number of neutrons of the fission fragments is much narrower than what would be expected on the basis of the variation ranges for Z and N. The ambiguity existing about whether the fragments of a pair are meant to complement before or after prompt neutron boil-off is removed, and Glendenin's treatment is confirmed. There are indications, which are in full agreement with the properties of Wahl's empirical Z(p) function, that the proton closed shell contribution (if any) to the fine structure observed in the isobaric yield curve may be larger than the contribution of the neutron closed shell. The isotopic yields of the known nuclides are significantly smaller than the yields defined by the full theoretical curves for Z = 38, 39, 40, 41, 52, and 57, indicating that new isotopes of Sr, Y, Zr, Nb, Te, and La are still to be identified as primary fission products from the thermal neutron fission of U(235).
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    Kinetics of the reaction of Tetrachloro-p-Benzoquinone with TRI-n-Dodecyl amine
    (T.A.E.C. Çekmece Nuclear Research Center, 1965-10) Erben, M. Talat; Dinçler, Güngör; TAEK-ÇNAEM
    The kinetics of the reaction of chloranil with tri-n-dodecyl amine have been investigated in the temperature range 100-115.5°C and in the concentration range 0.036-0.0697 M. The kinetics follow a simple second-order mechanism. The energy of activation is 19.7 Kcal./mole. The reaction product is a quaternary amnonium salt, (trichloro-p-benzoquinonyl)-tri-n-dodecyl ammonium chloride. The rate constant is given by: k = 5.74 x 10(10) exp(-9950/T) (minute)(-1) (mole)(-1)
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    Syntheses based on cholanic acid, ∆ 23 - cholone and 23 - amino norcholane
    (T.A.E.C. Çekmece Nuclear Research Center, 1967-04) Ünseren, Envare; TAEK-ÇNAEM
    Reduction of cholanic acid (III) with lithium aluminum hydride gave cholanyl alconol (IV). Benzoate, chloride, pyridinium chloride hydrate, ethyl carbonate, S-metnyl xanthate derivatives of cholanyl alcohol have been prepared, ∆23-Cholene has been obtained by the pyrolysis of the last two products. Osmium tetroxide hydroxylation of ∆-cnolene afforded 23,24-dioxy cholane (VIII). Schmid reaction on cholanic acid gave 23-amino norcholane (IX). Acetyl, benzoyl, and tosyl derivatives of the amine have been prepared. Reaction with potassium isocyanate gave norcholanyl urea (IX e). Norcholanic acid (X) has been obtained by the alcaline permanganate oxidation of 23-amino norcholane. Lithium aluminum hydride reduction of norcholanic acid gave norcholanyl alconol (XI).
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    The most general equations for multigroup neutron diffusion in P1 approximation
    (T.A.E.C. Çekmece Nuclear Research Center, 1962) Şuhubi, Erdoğan; Özemre, Ahmed Yüksel; TAEK-ÇNAEM
    Starting from the general transport equation and within the limits of P1 approximation, a set of coupled second order partial integro-differential equations is obtained. These equations consider the effect of m groups of retarded neutrons and contain both the first and the second derivatives of the neutron fluxes with respect to the time variable.