Στην παρούσα εργασία αναλύεται η γεωλογική δομή του Αγίου Ηλία Λευκάδας. Πραγματοποιήθηκε επίσης τεκτονική ανάλυση της περιοχής. / In this thesis we analyze the geological structure of the St. Elias Lefkada. Tectonic analysis was also performed in the area.

Στην παρούσα εργασία γίνεται χαρτογράφηση και τεκτονική ανάλυση του τεκτονικού ράκους του Γερόλεκα όπου παρατίθενται πετρώματα της Ζώνης Παρνασσού και της Ζώνης Βοιωτίας. / On this bachelor thesis we present the results of geological mapping and structural analysis that was elaborated in the area of Gerolekas which is occupied by rocks of Parnassos Zone.

At least 50,000 working-class laborers from the West Indies, many of them poor and unemployed, remained with their families in central Panama after the construction of the Panama Canal in 1914. Over the next thirty years, along with a small number of West Indian professionals, religious leaders, and business owners, they established ways to sustain themselves in locales, both in Panama and the American-controlled Canal Zone, where they faced challenges and opposition. Their sizable presence interrupted ideals of elite politicians in Panama to Hispanicize the population. Nationalist Panamanians stigmatized them as culturally different competitors for canal maintenance jobs, and lacking in loyalty to the state because they clung to English and their British colonial citizenship. In the Canal Zone, they faced racial segregation and second-class status. This dissertation examines critical physical and cultural spaces the immigrants created to foster community, provide social and economic security, educate their children, and as a corollary, develop new identities. Using archival material, land records, interviews and historical newspapers from Panama and the United States, and informed by a wide range of secondary sources, the chapters examine the activism of West Indians, in the context of Panamanian historical trends. The case studies analyze involvement of the immigrants in three particular settings: as members of voluntary associations called lodges, as renters and residents of neighborhoods, and as shapers of education for their children, who were born into citizenship in Panama. West Indians had come to Panama from different island cultures and maintained many differences, yet in these settings they developed commonalities and shared experiences as West Indian Panamanians. In the process, West Indian immigrants influenced Panama's development in ways little acknowledged in Panamanian or American national, social or economic history.

This is a presentation that was prepared by Dr. Kathleen Van Vlack. This presentation is focused on a form of traditional hand fishing practiced in the Exumas, Bahamas known as grubbing.

Enhancing the effective peel resistance of plastically deforming adhesive joints through laser-based surface micro-machining Edwin Hernandez Diaz Inspired by adhesion examples commonly found in nature, we reached out to examine the effect of different kinds of heterogeneous surface properties that may replicate this behavior and the mechanisms at work. In order to do this, we used pulsed laser ablation on copper substrates (CuZn40) aiming to increase adhesion for bonding. A Yb-fiber laser was used for surface preparation of the substrates, which were probed with a Scanning Electron Microscope (SEM) and X-ray Photoelectron Spectroscopy (XPS). Heterogeneous surface properties were devised through the use of simplified laser micromachined patterns which may induce sequential events of crack arrest propagation, thereby having a leveraging effect on dissipation. The me- chanical performance of copper/epoxy joints with homogeneous and heterogeneous laser micromachined interfaces was then analyzed using the T-peel test. Fractured surfaces were analyzed using SEM to resolve the mechanism of failure and adhesive penetration within induced surface asperities from the treatment. Results confirm positive modifications of the surface morphology and chemistry from laser ablation that enable mechanical interlocking and cohesive failure within the adhesive layer. Remarkable improvements of apparent peel energy, bond toughness, and effective peel force were appreciated with respect to sanded substrates as control samples.

Hydroclimatic variability in the western United States (the West) is characterized by a north-south dipole pattern of precipitation and streamflow variance, with centers of opposite association in the Pacific Northwest and the Desert Southwest. These dipole centers tend to react in opposite fashion to tropical Pacific Ocean conditions, and the resulting contrast in precipitation variability is an important component of Western climate. Teleconnection impacts are not as well understood in the transition zone separating the centers of opposite association, located primarily within the semi-arid Intermountain West. This leads to low hydroclimatic predictive capacity in the transition zone region, an area that is extremely important for water supply in the West. In this dissertation, I examine paleohydroclimatic variability in this region using dendrochronology, investigate recent variability through a synoptic climatology approach, and assess future conditions based on climate change projections.Overall, this dissertation's findings confirm that the transition zone region is highly vulnerable to extremes in hydroclimatic variability and underscore the need for improved predictive capacity in the region. In the Snake River headwaters, low- to mid-elevation Pseudotsuga menziesii trees are the strongest recorders of winter precipitation, a vital component of water supply, and the season of precipitation impacting growth is a major component of the overall variability between tree-ring sites in the region. The 415-year reconstruction of Snake River streamflow indicates that extended droughts, more severe than those recorded in the instrumental period, have occurred in the pre-instrumental past. Streamflow in the upper Snake River is strongly linked to Pacific Ocean conditions and sensitive to storm track position. The West's precipitation dipole has a surprisingly narrow transition zone that has shifted in its location over time in some areas but has remained remarkably stationary across Nevada and Utah. Projected climate changes - including warmer temperatures, changing seasonality, reduced snowpack, and changes in the storm track position - highlight the importance of understanding climate-water linkages for future water resource management.

Ce mémoire d’HDR dresse le constat de la force des logiques de spécialisation des espaces activées par et dans les politiques urbaines relevant du cadre de vie et de la qualité urbaine d’une part, objective leurs effets socio-spatiaux d’autre part, et renseigne les mécanismes par lesquels ces politiques s’imposent, enfin. Nettement, le cadrage et la mise en ½½uvre des politiques urbaines contemporaines, en matière de renouvellement urbain et de mobilité sûre et durable, témoignent d’une mise en ordre des territoires et des conduites, d’un tri des usages et des usagers dans la ville. Les canons contemporains de l’attractivité urbaine façonnent le gouvernement des territoires, un idéal de ville projeté fait de hauts lieux stratégiques à mettre en valeur et en creux, d’espaces sous-gouvernés. La qualité urbaine et la durabilité, convoquées pour justifier ces politiques urbaines, agissent comme de puissants mots d’ordre qui viennent dissoudre les prises de la contestation. Sans nul doute, la mise en scène de la qualité de vie dans les centres-villes historiques patrimoniaux et pittoresques répond en grande partie à l’impératif de valorisation d’une identité urbaine, tel un avantage comparatif dont usent et abusent les villes européennes, contre-modèle parfait de la métropole XXL américaine ou du monde émergent. Au-delà de ce constat, l’apport théorique original de nos travaux, a consisté à identifier les mécanismes par lesquels cet ordre urbain se déploie. Ce faisant, ce travail s’inscrit au c½ur d’une controverse scientifique contemporaine qui voit se confronter des travaux radicaux néomarxistes qui mettent l’accent sur les logiques de domination en ville, de soumission au marché, de mise à distance des surnuméraires du capitalisme d’une part, et des travaux d’inspiration néowébérienne, qui insistent sur le pluralisme des intérêts en ville, sur la capacité politique des sociétés urbaines à produire du sens et des politiques publiques d’autre part.

No description available.

The state transportation agencies (STAs) in the United States are mandated by federal rule to carry out work-zone impact assessment for highway rehabilitation projects. The work zone impact assessment requires calculating road user costs (RUCs) which is the sum of vehicle operating costs, accident costs, and value of time (VOT). The term ‘value of time’ refers to monetary equivalent of travel time wasted due to rehabilitation projects. In current practice, STAs assume VOT as homogeneous within their respective states. This leads to inaccurate RUCs calculations and poses many misapplications. Research has found that VOT is influenced by socio-demographic variables which vary within the states. But there is a lack of framework to evaluate the extent to which these factors affect value of time. The major objective of this research is to develop and validate a model that predicts value of time heterogeneously. The data were collected to cover 20 major cities in California. The state of California was chosen for this study because most highway rehabilitation projects are carried out there. The data sources included the United States Census Bureau, the California Department of Transportation (Caltrans), and the Bureau of Labor Statistics. With these data, a predictive model was developed using multiple linear regression analysis. Lastly, the model was validated using PRESS statistic. The results reveal that age, annual average daily traffic, and effective hourly income were the most significant factors influencing value of time. This study developed a model which will help Caltrans in calculating value of time heterogeneously and therefore, improve the accuracy of RUCs calculations. Moreover, this research will serve as a guideline for other STAs to develop models for respective states. Therefore, this model has a potential to greatly improve the accuracy of value of time and therefore, RUCs. The future research should focus on the identified factors, especially cost-of-living index and annual average daily traffic. Further research is required to account for heterogeneity due to other factors such as vehicle occupancy, frequency of travel, and educational qualifications.

Within the middle McMurray exposures along the Steepbank River (Steepbank River Outcrops 3 and 4), nine recognized facies can be divided into three genetically related groups: sand-dominated facies, inclined heterolithic stratification (IHS) facies and mixed heterolithic facies. Together, these facies are interpreted to represent a fluvially dominated, tidally influenced point bar that experienced strong seasonal variation in river discharge. Annual fluctuations between river-flood stage and low-flow stage are responsible for the deposition of fluvially dominated sand beds alternating with brackish, tidally influenced mud beds that cover the point-bar surface as members of the various IHS facies. The dichotomy of fluvially dominated sand deposition and brackish-water ichnology of the mud beds represents the annual migration in position of the tidal and salinity nodes caused by fluctuations in fluvial discharge. Recognition of metre-scale cycles (MSCs) of alternating sandier and muddier intervals within the IHS facies imply that decadal climate cycles, likely caused by fluctuations in ocean and/or solar dynamics, influenced point-bar deposition. These MSC packages are defined by an upward decrease in sand-bed thickness, an upward increase in mud-bed frequency, and an upward increase in bioturbation intensity, all occurring on a metre scale. MSCs are an important architectural element of these large-scale tidal-fluvial point bars because they are predictable, repeatable and continuous around the point bar. Analysis of paleocurrents relative to inclined-heterolithic-stratification bedding planes indicates that bend-flow modifications (BFMs) were effective in redistributing flow around the point bar. Furthermore, this suggests that Outcrop 3 is representative of an upstream-to-bend-apex transition within a large-scale point-bar planform. Recognition of multiple channels at Outcrop 4 was based on large-scale erosional truncation, IHS bed-orientation changes, large cumulative thicknesses of the middle McMurray, thick sand-package thicknesses, changes in relative scale of sedimentary structures, and the occurrence of large mud clasts. Similarities in depositional expression between channels suggest autogenic channel stacking (within-valley stacking), rather than the stacking of separate valleys. Finally, discordant paleocurrents within the basal sand-dominated facies are likely representative of amalgamated channel-bottom facies from several generations of channel. This suggests that only the upper intervals of basal sand-dominated facies are genetically linked to the overlying IHS facies. / Thesis (Master, Geological Sciences & Geological Engineering) -- Queen's University, 2012-01-30 13:25:32.53