No description available.

The breakthrough technology in dry fiber fabrication has opened the possibility for using fiber bandwidths all the way from 1.3 to 1.6£gm. However, the fiber amplifier used in commercial product, such as erbium-doped fiber amplifier (EDFA), can not fully cover the whole fiber bandwidths from 1.3 to 1.6£gm with a single fiber amplifier. Recently, the Cr4+-doped fiber has shown a broadband emission from 1.3 to 1.6£gm. Therefore, it is interesting to develop a single fiber amplifier which can operate the wide bandwidth of the 1.3~1.6£gm emission. In this study, we have successfully fabricated and measured the Cr-doped fibers by using a commercial drawing-tower technique and a rod-in-tube method. The core diameters were 26 and 16£gm. The Cr4+ fluorescence spectrum showed a broadband emission from 1.2 to 1.6£gm. The radiation intensity was up to the order of nW. This indicates that the new Cr-doped fibers may be used as a broadband fiber amplifier. The advantages of using the drawing tower to fabricate the Cr-doped fibers are to have a better control of the core diameter, the fiber uniformity and circularity. Therefore, the Cr-doped fibers may have a potential for commercial production and application to lightwave communication systems.

Atmospheric icing is a major design factor for guyed lattice masts and transmission lines in Canada and many others countries with cold climate. Tall and slender guyed lattice towers are particularly sensitive to ice accretion, wind or combination of both, as they are often located in remote areas, where meteorological data are limited. The variation of local topography and seasonal climate affects icing conditions and complicates standardization of icing accretion design guidelines. Icing design criteria was evaluated in this study through an extensive literature review of current design standards for latticed structures subjected to ice and wind load and/or a combination of both, field and laboratory work.

Atmospheric icing is a major design factor for guyed lattice masts and transmission lines in Canada and many others countries with cold climate. Tall and slender guyed lattice towers are particularly sensitive to ice accretion, wind or combination of both, as they are often located in remote areas, where meteorological data are limited. The variation of local topography and seasonal climate affects icing conditions and complicates standardization of icing accretion design guidelines. Icing design criteria was evaluated in this study through an extensive literature review of current design standards for latticed structures subjected to ice and wind load and/or a combination of both, field and laboratory work.

No description available.

Timber Tower: 10 20 30 offers a conceptual structural system for tall wooden buildings. The thesis has been a noumenal design process into the subject of timber towers, where the conceptual system is designed to work in accordance with engineering concepts for tall buildings. The system uses mass timber as the primary structural material supported by embedded steel plates. The introduced system plays to the strength and weaknesses of both corresponding materials. Mass timber is used as the primary material that is designed to take care of the dead & live loads, while steel is used as a secondary material to give additional support to the vertical loads. The structural system is interpolated to three different height categories; 10, 20 & 30. The timber & steel system is designed to be prefabricated in parts and assembled on site. Other considerations also addressed in the thesis has been fire-, weather- and soundproofing of the structure.

There is a beauty to the absurdity of the moment at which there is almost no line between the real and the unreal. In such realm, an illusion, and yet the possibility, of a tower acts as a protagonist with which one can begin to let his imagination approve of the absurd, the too ambitious, the unlikely. The first nine towers are the outcome of my attempt to intertwine two arenas of photography and architecture. They investigate the possibility of compressing the reality of a place into a hyperreal image consisting of a photograph of the place, which acts as the site, and a fantastical addition. They also aim to document and express my memories of the places that I visited during my more than 15,000 miles of traveling over the past year. Each tower is an homage to the memory of its respective place. / Master of Architecture

This thesis is an investigation of a tower known only from the ancient works of a discoverer. The discoverer, who holds witness to the wondrous composition of the monument, documents the tower through illustrative and literary terms as a record of the findings for the reader. / Master of Architecture

It is important to ensure that Transpower is prepared to deliver upcoming transmission tower refurbishment projects that are located on sites with difficult access. This project reviews the availability, capability and cost of utilising alternative construction methods and any associated wider issues. The focus of this report is on how Transpower can more effectively utilise helicopters and gin poles for transmission tower erection and material delivery on remote sites.

Thesis (Th. M.)--Dallas Theological Seminary, 2001. / Includes bibliographical references (leaves 84-92).