The linear analysis of a specific framed dome is mapped for the unsymmetric loadings of half snow and wind. The joints of the dome, to which the loads are applied, lie on a spherical surface but the connecting members are straight. Several parameters, such as the perimeter ring size, the web member area, geometric conformity, and joint fixity, are changed and the effects of these changes are compared and discussed. It is shown that membrane shell theory closely approximates the member forces induced by wind. An approximate system to find the member forces is presented and compared with the exact analysis. This system is based on overall structure equilibrium and an assumed distribution of edge shear. All analyses were made using a space frame program based on the stiffness method with six degrees of freedom per joint; An IBM 7040 computer was used for calculations. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

No description available.

No description available.

The goal of this work reported here is to test the limits of the ECPSSR theory in the transition region of the low Z1/Z2.

<p><font face="TimesNewRomanPSMT"> <p align="left">The objective of the present investigation is to calculate observables using the nuclear shell model for a variety of nuclear phenomena and to make comparisons with experimental data as well as the older interaction. The shell-model code OXBASH was employed for the calculations. Quantities investigated include energy level schemes, static magnetic dipole and electric quadrupole moments, electromagnetic transition probabilities, spectroscopic factors and beta decay rates.</p> </font></p>

Pt-based alloy surfaces are used to catalyze the electrochemical oxygen reduction reaction (ORR), where molecular oxygen is converted into water on fuel cell electrodes. In this work, we address challenges due to the cost of high Pt loadings in the cathode electrocatalyst, as well as those arising from catalyst durability. We aim to develop an increased understanding of the factors that determine ORR activity together with stability against surface segregation and dissolution of Pt-based alloys. We firstly focus on the problem of determining surface atomic distribution resulting from surface segregation phenomena. We use first-principles density functional theory (DFT) calculations on PtCo and Pt3Co overall compositions, as well as adsorption of water and atomic oxygen on PtCo(111) and Pt-skin structures. The bonding between water and surfaces of PtCo and Pt-skin monolayers are investigated in terms of orbital population. Also, on both surfaces, the surface reconstruction effect due to high oxygen coverage and water co-adsorption is investigated. Although the PtCo structures show good activity, a large dissolution of Co atoms tends to occur in acid medium. To tackle this problem, we examine core-shell structures which showed improved stability and activity compared to Pt(111), in particular, one consisting of a surface Pt-skin monolayer over an IrCo or Ir3Co core, with or without a Pd interlayer between the Pt surface and the Ir-Co core. DFT analysis of surface segregation, surface stability against dissolution, surface Pourbaix diagrams, and reaction mechanisms provide useful predictions on catalyst durability, onset potential for water oxidation, surface atomic distribution, coverage of oxygenated species, and activity. The roles of the Pd interlayer in the core-shell structures that influence higher ORR activity are clarified. Furthermore, the stability and activity enhancement of new shell-anchor-core structures of Pt/Fe-C/core, Pt/Co-C/core and Pt/Ni-C/core are demonstrated with core materials of Ir, Pd3Co, Ir3Co, IrCo and IrNi. Based on the analysis, Pt/Fe-C/Ir, Pt/Co-C/Ir, Pt/Ni-C/Ir, Pt/Co-C/Pd3Co, Pt/Fe-C/Pd3Co, Pt/Co- C/Ir3Co, Pt/Fe-C/Ir3Co, Pt/Co-C/IrCo, Pt/Co-C/IrNi, and Pt/Fe-C/IrNi structures show promise in terms of both improved durability and relatively high ORR activity.

<p><font face="TimesNewRomanPSMT"> <p align="left">The objective of the present investigation is to calculate observables using the nuclear shell model for a variety of nuclear phenomena and to make comparisons with experimental data as well as the older interaction. The shell-model code OXBASH was employed for the calculations. Quantities investigated include energy level schemes, static magnetic dipole and electric quadrupole moments, electromagnetic transition probabilities, spectroscopic factors and beta decay rates.</p> </font></p>

<p> A computer program is written to calculate the deflections and stresses in a shell of general nature.</p> <p> An oblique. truncated pyramid, built of aluminium plates is used for illustration and experimental analysis. </p> <p> Theoretical values of deflections and stresses are compared with the experimental results. </p> / Thesis / Master of Engineering (MEngr)

published_or_final_version / Mathematics / Master / Master of Philosophy

The intent of this Project was to identify areas of improvement in Shell Todd Oil Services (STOS) Well, Reservoir and Facility Management (WRFM) practices, in order to meet full compliance with Shell global WRFM Standards by their next annual review in Q4 2014. A gap analysis was carried out to identify where improvement efforts must be focussed and measures to support optimisation, streamlining and alignment of processes have been recommended. The Shell Blade 27 – Well, Reservoir and Facility Management Guideline was used to obtain insight and understanding of the WRFM process and requirements. The STOS WRM Management Manual, WRFM Plans and Health-check outputs were used as supplementary documentation for the gap analysis. The Shell WRFM minimum requirements were used as the established benchmark against which STOS practices were measured using the asset assessment tool. Interviews were carried out to further highlight complexities and constraints at STOS to meet Shell criteria. The findings in this report provide evidence of issues that should be addressed for the continuous improvement of WRFM at STOS. These have been provided for the consideration of Shell Todd Oil Services Limited WRFM Steering Committee Chair.