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Geotechnical Engineering Commons

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2008

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Articles 361 - 363 of 363

Full-Text Articles in Geotechnical Engineering

Expert System Design Guide For Lower Classification Roads Over High Pi Clays, Yaqi Wanyan Jan 2008

Expert System Design Guide For Lower Classification Roads Over High Pi Clays, Yaqi Wanyan

Open Access Theses & Dissertations

This research was focused on low-volume roads over expansive clayey soils in Texas. In spite of the redundant pavement designs recommended and widely used in Texas for roads in high PI clay areas, these pavements often fail prematurely. This failure occurs primarily because of the highly variable properties of the clayey subgrade throughout the year due to moisture fluctuations. The problematic nature of high PI clays, despite the fact that volumetric changes such as heaving are sometime considered in the design, is of concern since they contribute to roughness and longitudinal shrinkage cracking of the road, and as such the …


Sediment Budgets In The Irish Estuarine Environment, Kevin Motherway Jan 2008

Sediment Budgets In The Irish Estuarine Environment, Kevin Motherway

Theses

A sediment budget is the quantification of sediment sources and sinks for natural physical systems such as rivers and estuaries.

This thesis has developed estuarine sediment budgets for Cork Harbour, Kinsale Harbour and Youghal Harbour. The thesis includes a literature review of the properties of sediment, river and estuary related sediment transport, sediment management and sediment related legislation and the approaches used to develop a sediment budget for an estuary system.

An extensive study of riverine suspended sediments discharging to the estuaries has been undertaken. Both surface grab samples and depth integrating suspended sediment samples were collected, tested and analysed. …


Antennas For Portable Communications In The Uwb And Gps Spectra., Giuseppe Ruvio Jan 2008

Antennas For Portable Communications In The Uwb And Gps Spectra., Giuseppe Ruvio

Doctoral

The thesis describes a study of antennas for solutions in emerging systems. An account of the fundamental principles of these antennas is given together with an outline of the basic electromagnetic theory on which the designs are based. While the main focus is on antennas for Ultra Wideband (UWB) systems, some additional work was carried out on enhancing performance of circularly polarised antennas for satellite navigation systems. The study focussed on the design of highly efficient broadband antennas with particular requirements for size compactness, gain stability, phase-linearity, and the use of low-cost materials. These requirements are particularly important for UWB …