Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 31 for “"long-term behaviour"”.
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Long-term behaviour of twin tunnels in London clay
… tunnels requires a deeper understanding of the long-term behaviour of twin tunnels, whilst lack of permeability data limits the accuracy of long-term predictions. This thesis therefore investigates long-term twin-tunnel behaviour through finite-element parametric analyses, and provides additional …
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The long-term behaviour of butt fusion welds in polyethylene pipeline systems
… first and primary part of the programme was to determine the extent to which the pipe system's long-term strength under both internal fluctuating and constant pressure is reduced by the presence of axially misaligned butt welds. The second objective was to examine fracture initiation sites and …
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Multi-axial strain monitoring of fibre reinforced thermosetting plastics using embedded highly birefringent optical fibre Bragg sensors
… one has to realize that their mechanical behaviour is significantly different compared to conventional isotropic construction materials. Strain monitoring of an in-service structure should greatly enhance the insight and confidence in the (long-term) behaviour of high performance composite …
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Competition within random growth models
… have been constructed we then analyse the long term behaviour of them and find their asymptotic distribution, this is done by using the speed measure and scale function.
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Análise numérica de aterro sobre solo compressível utilizando as teorias de estados críticos e de adensamento de Biot
… for pore-pressures are obtained. To evaluate the long term behaviour of the embankment, a drained and a full coupled consolidation analyses of the embankment have also been carried out.
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Structural behaviour of concrete segmental lining tunnels: towards design optimisation
… tunnel design life. Most research to date on CSL behaviour during construction neglects the sequential ring loading and TBM-lining transverse interactions, which this thesis proved to be key in the short and long term behaviour of CSLs and whose study is essential if the design and maintenance of …
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GFRP reinforced concrete : environmental and movement characteristics
… challenges such as lack of design codes, brittle behaviour of FRP resulting in reduced structural ductility, low bond capacity to concrete, and lack of knowledge of durability issues and long-term behaviour of concrete reinforced with composite reinforcement. In this investigation, some properties …
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The mechanical design aspects of a small diameter vascular prosthesis
… are both important characteristics that determine the successful functioning of the graft. The current work is part of a collaborative venture with the Cardiovascular Research Unit (CVRU) at the University of Cape Town to design and develop a new polyurethane graft. Finite element models …
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A statistical approach to urban stormwater detention planning
… model has been developed to study the long-term behaviour of a stormwater detention unit. This unit stores a portion of the incoming runoff, corresponding to the empty space available in the unit, from which runoff is pumped to a treatment plant. The objective is to avoid, as much as …
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Fracture Initiation and Propagation in Low Porosity Crystalline Rocks: Implications for Excavation Damage Zone (EDZ) Mechanics
… (DGR) is the globally preferred concept for long-term storage of nuclear waste, in which the combination of engineered barriers and the surrounding geology are designed to safely and securely contain the radioactive waste. The construction processes of underground openings in hard rocks at …
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Moisture Conditions and Frost Resistance of Concrete in Hydraulic Structures
… observations have raised questions about the long-term behaviour of hydraulic structures in cold regions. Superficial damage, similar in appearance to salt scaling of concrete, can be seen at the waterline of hydraulic structures, such as hydro power structures. Progressive damage to the …
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Dynamics and Stability of Parametrically Excited Gyroscopic Systems
… to a double zero resonance. It is shown that the long term behaviour of the original four-dimensional system can be approximated by a one dimensional Markov process which take values on a line or a graph. These results are applied to study the dynamics and stability of a rotating shaft subjected …
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A geochemical investigation of the waters and sediments of De Hoop Vlei, Bredasdorp district, South Africa
… and Forestry monitoring data in order to examine long term behaviour of the system, particularly with respect to the effect of evaporative concentration on water composition. Furthermore, chemical equilibrium was modelled, using the geochemical model MINTEQA2, in order to give an indication of …
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Co-production and evaluation of an evidence-based approach to promote physical activity for adults with health conditions
… provide a promising framework to support PA behaviour change in inactive individuals with health conditions. Yet, due to a lack of scientific evidence and behaviour change theory underpinning the design of ERSs, there has been a lack of evidence of effectiveness. Translational research is …
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Exploration of Hydrogen Gas Evolution from Radioactive Sludges
… into this facility requires knowledge about the long-term behaviour of the material in the disposal conditions. It is critical to consider what effect the ionising radiation introduced by contaminants will have. In the case of Magnox sludge, a complex material that exists in large quantities, it …
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Limiting Conditional Distributions: Imprecision and Relation to the Hazard Rate
… through the use of several examples that the behaviour considered by those conjectures is more complex then previously believed. In Chapters 3 and 4 we consider discrete Markov chains in the context of imprecise probability. In many situations it may be unrealistic to assume that the …
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Optical studies of the mesospheric region
… year dataset also allowed investigation of the long-term behaviour of the airglow. Both the intensity and variance were analysed using the Lomb-Scargle method across the complete dataset to identify the dominant periods present. Following similar treatment, the MF spaced antenna winds were …
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Physics in the extreme: X-ray and optical studies of magnetic white dwarfs and related objects
… There is also a strong focus on studying the long term behaviour in intermediate polars in this thesis. Chapter 5 presents results from Kepler observations of FO Aquarii taken over 69 consecutive days. The shape of the light curve is consistent with the outer edge of the accretion disc being …
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