University of Lethbridge Institutional RepositoryThe University of Lethbridge Institutional Repository contains a collection of research, data and publications completed by the academic community.http://www.uleth.ca:80/dspace2017-06-23T21:04:14Z2017-06-23T21:04:14ZLived realities : climate change, neoliberalism, and livelihood strategies on the southern altiplano of BoliviaGuthrie, Hunter J.University of Lethbridge. Faculty of Arts and Sciencehttp://hdl.handle.net/10133/48542017-06-08T17:25:17Z2017-01-01T00:00:00ZLived realities : climate change, neoliberalism, and livelihood strategies on the southern altiplano of Bolivia
Guthrie, Hunter J.; University of Lethbridge. Faculty of Arts and Science
This thesis examines the cumulative effects of climate change, neoliberal reform, resource extraction, and global quinoa demand and their implications for the livelihoods of villagers in the southern altiplano community of San Pedro de Condo, Bolivia. I argue that, due to their spatial and temporal overlap, the effects of these phenomena are mutually reinforcing and have together transformed the local environment, traditional knowledge of and relations to the environment, agricultural production, and livelihood strategies. I contend that in response to such transformations, Condeños have engaged in various strategic economic activities that have become increasingly articulated with and connected to the global political-economic system. This thesis presents significant contributions by analyzing climate change as part of a broader world- system, rather than in isolation, and thus avoids what Mike Hulme (2011) has called “climate reductionism”. Finally, I have provided an extension onto the concept of “dispossession by accumulation” put forth by Tom Perreault (2012), by highlighting the effects of dispossession that climate change has in the community of Condo, therefore advocating for an expanded understanding of the analysis of dispossession and capital accumulation and the ways in which the natural environment is enrolled in such processes.
2017-01-01T00:00:00ZThe effects of multiple stressors (diltiazem, hypoxia, and temperature) on the cardiovascular function of rainbow troutKeller, Antonio Goes Ferreira dos SantosUniversity of Lethbridge. Faculty of Arts and Sciencehttp://hdl.handle.net/10133/48532017-06-01T21:30:53Z2017-01-01T00:00:00ZThe effects of multiple stressors (diltiazem, hypoxia, and temperature) on the cardiovascular function of rainbow trout
Keller, Antonio Goes Ferreira dos Santos; University of Lethbridge. Faculty of Arts and Science
The effects of climate change, hypoxia of surface waters, disposal of pharmaceuticals, among other stressors to freshwater ecosystems, are important concerns of modern civilization. Diltiazem (DTZ) is a calcium channel blocker prescribed for heart diseases in humans; however, the knowledge of the effects of DTZ in the aquatic environment is limited. The present study investigated the cardiovascular effects of DTZ in rainbow trout. Fish were exposed in the laboratory to DTZ (0, 1, 10, 100 and 1000μg/L) for 96 hours at different temperatures (4ºC, 10ºC and 18ºC) and different dissolved oxygen concentrations (4mg/L and 8mg/L). DTZ (1 and 10 μg/L) impaired the increase of hemoglobin under hypoxia, at 1 μg/L impaired the increase of the ventilation rate, and at 10 μg/L increased the immature RBC counts, suggesting impairment of the cardiovascular system of rainbow trout. No statistically significant effects of DTZ on heart rate, oxygen consumption or hematocrit were detected.
2017-01-01T00:00:00ZEvaluating the effects of a brief mindfulness-based stress reduction intervention on the experience of stress in after-degree nursing studentsMarthiensen, Robert GaryUniversity of Lethbridge. Faculty of Health Scienceshttp://hdl.handle.net/10133/48522017-05-31T21:43:58Z2017-01-01T00:00:00ZEvaluating the effects of a brief mindfulness-based stress reduction intervention on the experience of stress in after-degree nursing students
Marthiensen, Robert Gary; University of Lethbridge. Faculty of Health Sciences
This study evaluated the effectiveness of mindfulness in helping after-degree nursing students manage stress. Two 4-hour brief Mindfulness Based Stress Reduction (MBSR-B) training sessions were delivered involving sitting meditation, yoga, and body scan. Participants used the techniques 30 minutes per day for four weeks. Qualitative, individual, semi-structured interviews were conducted after the 4-week practice period. Most felt the intervention structure was effective for learning MBSR-B. The benefit of MBSR-B was stronger for some, likely related to individual learning styles, comfort with self-discovery and sharing. The group setting helped maintain focus and accountability, but could also inhibit sharing. All participants indicated mindfulness helped reduce their stress. Enhanced self-awareness resulted in early detection of stress, ability to change negative perception, development of self-compassion, acceptance of competence, immediate addressing of stress, and use of internal coping mechanisms. Findings indicate this type of stress management support may benefit after-degree nursing students, which may prove useful when developing nursing curriculums.
2017-01-01T00:00:00ZAlgorithms for weighted coloring problemsDahal, Ram SewakUniversity of Lethbridge. Faculty of Arts and Sciencehttp://hdl.handle.net/10133/48512017-05-29T21:56:33Z2017-01-01T00:00:00ZAlgorithms for weighted coloring problems
Dahal, Ram Sewak; University of Lethbridge. Faculty of Arts and Science
In this thesis, we studied a generalization of vertex coloring problem (VCP). A classical VCP is an assignment of colors to the vertices of a given graph such that no two adjacent vertices receive the same color. The objective is to find a coloring with the minimum number of colors. In the first part of the thesis, we studied the weighted version of the problem, where vertices have non-negative weights. In a weighted vertex coloring problem (WVCP) the cost of each color depends on the weights of the vertices assigned to that color and equals the maximum of these weights. Furthermore, in WVCP, the adjacent vertices are assigned different colors, and the objective is to minimize the total cost of all the colors used. We studied WVCP and proposed an O(n^2 log n) time algorithm for binary trees. Additionally, we studied WVCP in cactus paths. We proposed sub-quadratic and quadratic time algorithms for cactus paths.
We studied a min-max regret version of the robust optimization where the weight of each vertex v is in the interval [w v , w v ]. The objective of is to find a coloring that has the minimum regret value. We proposed a linear time algorithm for robust coloring on bipartite graphs with uniform upper bound and arbitrary lower bound weights on the vertices. We also gave an integer linear programming (ILP) for the robust weighted vertex coloring problem (RWVCP). We solved a relaxation of the ILP formulation using column generation. We also gave an algorithm based on the branch and price method. Lastly, we performed experiments to study the quality of our algorithms.
2017-01-01T00:00:00Z