MANE (MCNP ACE from NJOY & ENDF), a code for generating continuous energy cross sections at arbitrary temperatures, was created. Cross sections were evaluated using NJOY99 such that they would agree with the cross sections provided by MCNP5. The MANE cross sections were found to be in very good agreement with those provided by MCNP5 with some minor exceptions caused by round-off errors and some differences in the unresolved resonance region. Differences in the resonance region are caused by differences in the random number generator used to start the cross section calculations. The MANE cross sections were verified against the MCNP5 cross sections in five unique MCNP configurations: an 8.7% enriched MOX fuel pin cell, a UO₂ assembly (controlled and uncontrolled), a MOX assembly, and a whole core configuration containing the 3 assemblies. In each of these cases, eigenvalue and tally density results were found to be in very good agreement with one another.

No description available.

The present study deals with the use of fiberglass reinforced polymer bars (GFRP) as a replacement for the common steel of a reinforced concrete circular pile, in order to avoid the corrosion of durability of reinforcing bars and thus improve them. The comparative analysis was carried out between a pile reinforced with GFRP and another with steel, where the ductility was evaluated by obtaining moment-curvature diagram. As a result, said idealized moment-curvature diagrams and ductility indices are presented, concluding the ductility of the section reinforced with GFRP in 20% more than that of steel.

博士（商学） / 甲第544号 / 3, 175p / Hitotsubashi University(一橋大学)

<p> In the soft photon limit the bremsstrahlung cross-section is related to the corresponding elastic scattering cross-section in a model-independent manner. The cross-section for threshold photoproduction of pions becomes independent of the detailed pion-nucleon interaction if the ratio of pion to nucleon mass is made sufficiently small. These two results are a consequence of the gauge invariance of the scattering amplitude for a process involving one photon. We review the derivation of Low's bremsstrahlung theorem for spin-zero and spin-half particles, and outline an extension to all orders of photon energy. The theorem for photopion production is derived by the same method. A non-relativistic analogue to the Bremsstrahlung theorem is also considered.</p> / Thesis / Master of Science (MSc)

<p> The total scattering cross section of solid methane has been measured for temperatures in the range from 4.2°K to 95°K. An anomalous increase in the total scattering cross section was observed at temperatures below 5°K. The effect is ascribed to conversion between nuclear spin species. Such spin conversion had been indicated by specific heat and NMR measurements; the present results give an independent confirmation of this. Calculations of the equilibrium value of <I(I + 1)> at 4.2°K give values lower than those obtained in the NMR work. The specimens used in the present work come to spin equilibrium in times much less than 20 minutes. This is less than the value of 90 minutes for pure methane seen by NMR; however, very small amounts of oxygen impurity in the specimen are known greatly to decrease this time.</p> <p> An abrupt change in the total scattering cross section at the 20°K phase transition is explained by a change in the rotational freedom of the molecules to a more strongly hindered state below the phase transition. In the region above the transition, the Krieger-Nelkin approximation for the total cross section was fitted to the observed temperature dependence of the cross section, treating the effective mass as a free parameter.</p> / Thesis / Master of Science (MSc)

<p> This study appraises the significance of a selected number of variables - economic demographic, and physical - in explaining the inter-farm variation in gross cash income on a sample of small-scale multiple enterprize farms, Jamaica, West Indies. Chapter I outlines the purpose and methodology of the analysis, while Chapter II describes the physical geography and farming systems of the area. A review of literature germane to the main body of the study is covered in Chapter III. Specifying a model that traces out the relative significance of those variables which are hypothesized as influences on the inter-farm variation in gross cash income is the focus of Chapter IV. The final chapter summarizes and interprets the main findings of the study.</p> / Thesis / Master of Arts (MA)

No description available.

No description available.

A Dempster-type double-focussing mass spectrometer has been used to determine the relative abundances of the isotopes of neodymium using two samples, one irradiated in a strong neutron flux, the other, obtained from the same source, unirradiated. A comparison of these results permits the calculation of the cross-section of each isotope for the capture of pile neutrons. Results previously obtained have been extended to give definite cross-sections for three of the isotopes, two of which have not previously been reported, and to lower the upper limits for the remainder. / Thesis / Master of Science (MS)