Thesis (Ph. D.)--University of Hawaii at Manoa, 2004. / Includes bibliographical references (leaves 211-220). / Also available by subscription via World Wide Web / xviii, 220 leaves, bound ill. 29 cm

The Swedish city of Umeå is one amongst other cities that has a focus on the increase in the bicycling usage. The municipality of Umeå aims to make public transport, bicycling and walking the most frequently used modes of transport in the city (Umeå kommun, 2017b). There are both positive and negative effects when people are using the bicycle as a mode of transportation. The positive aspects can be increase in health benefits, more environmentally friendly than other transport options and it is a relatively cheap way to transport oneself. The negative aspects can be that more people get hurt due to the risks with bicycling such as physical infrastructure related hazards. The aim of this thesis is to explore if the number of roads in an intersection has any correlation with the amount and severity of accidents and to analyse it in the scope of sustainable development and accessibility. This was done with the quantitative database STRADA which consists of both hospital data and police data on bicycles accidents in the timespan of 2008-2018. The chosen study area was Umeå but with two more specific locations: the city centre and the campus area. Two different approaches were used to utilize the data from STRADA: GIS to create descriptive maps and calculations of the bicycle accidents and logistics-regressions to investigate the accident severity relation to a certain number of chosen variables. The main findings were that it is important that every aspect of bicycling should be as safe as possible otherwise many beneficial effects with bicycling may disappear, such as the ones with sustainable development and accessibility. The results show that there was one type of intersection that had relevance and that was the intersections with three roads in it. Three road intersections were significant in two ways. The first way was that it caused an increased risk in more severe accidents and the second way had an opposite relationship and this was depending on what type of geographical place one was looking at. As with other risk factors there were many variables that affected the outcome of the risk. In Umeå it seemed that people that were over age 39, accidents with vehicles and winter were factors alongside with the three road intersections.

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<p>In this thesis, for symplectic and split odd special orthogonal groups over a p-adic field, we provide an extensive account of the intersection of local Arthur packets. More specifically, following Atobe's reformulation of Moeglin's construction of local Arthur packets, we give precise algorithms to determine whether a given representation lies in any local Arthur packet. Furthermore, if the representation does lie in a local Arthur packet, we give a systematic approach to determine all the other local Arthur packets which also contain the representation. These algorithms are based on certain operators which act on certain construction data coming from Atobe's parametrization of the local Arthur packets.</p>

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<p>An experimental investigation was conducted to analyze the effectiveness of repairing and retrofitting the intersections of flanged concrete block shear walls using surface-bonded fiber-reinforced polymer (FRP) laminates for seismic load applications. A total of 18 specially designed flange-web intersecting wall assemblages were tested using 5 different schemes. Tests included wall intersections reinforced with unidirectional FRP with the fibers oriented perpendicular to loading direction (90°), parallel to loading direction (0°) and bi-directional (90°/0°), (90°/0°)2 and (45°/135°) to applied load direction. The behaviour of each wall specimen is discussed with respect to its failure mode, strength and deformation characteristics. Results showed that the laminates significantly increased the shear strength of concrete block shear walls junction. In addition, the fiber orientation influenced the failure mode, strength and stiffness. Moreover, depending on the fiber orientation, a significant enhancement to the post-peak load energy absorption capacity of the web-flange intersection can occur. The improved post-peak behaviour addressed the benefits of retrofitting concrete block wall intersections for seismic load applications. The FRP-retrofitted specimens were capable of reaching between 90% to 390% increase in strength compared to the umetrofitted specimen constructed with traditional steel joint reinforcement.</p> / Thesis / Master of Engineering (MEngr)

We study Hessenberg varieties in type A via their local defining equations, called patch ideals. We focus on two main classes of Hessenberg varieties: those associated to a regular nilpotent operator and to those associated to a semisimple operator. In the setting of regular semisimple Hessenberg varieties, which are known to be smooth and irreducible, we determine that their patch ideals are triangular complete intersections, as defined by Da Silva and Harada. For semisimple Hessenberg varieties, we give a partial positive answer to a conjecture of Insko and Precup that a given family of set-theoretic local defining ideals are radical. A regular nilpotent Hessenberg Schubert cell is the intersection of a Schubert cell with a regular nilpotent Hessenberg variety. Following the work of the author with Da Silva, Harada, and Rajchgot, we construct an embedding of the regular nilpotent Hessenberg Schubert cells into the coordinate chart of the regular nilpotent Hessenberg variety corresponding to the longest-word permutation in Bruhat order. This allows us to use work of Da Silva and Harada to conclude that regular nilpotent Hessenberg Schubert cells are also local triangular complete intersections. / Thesis / Master of Science (MSc) / Algebraic varieties provide a generalization of curves in the plane, such as parabolas and ellipses. One such family of these varieties are called Hessenberg varieties, and they are known to have connections to other areas of pure and applied mathematics, including to numerical linear algebra, combinatorics, and geometric representation theory. In this thesis, we view Hessenberg varieties as a collection of subvarieties, called coordinate charts, and study the computational geometry of each coordinate chart. Although this is a local approach, we recover global geometric data on Hessenberg varieties. We also provide a partial positive answer to an open question in the area.

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