This thesis will discuss the factors that lead to language shift from Zapotec to Spanish in San Jerónimo Tlacochahuaya (SJT), and the challenges faced by language revitalization efforts that have emerged in the home and migrant communities. Today hundreds of Indigenous languages are widely spoken across the Americas; however, in the last century an increasing amount of language shift to the nation-state language has taken place in many Indigenous communities. In the Zapotec community of San Jerónimo Tlacochahuaya (SJT), located in the southern Mexican state of Oaxaca, about 40% of the town’s population currently speaks Zapotec. However, the majority of speakers within this percentage are elders and adults. This means that the transmission of the Zapotec language to children has declined while Spanish language socialization has increased and is now the norm. Due to socioeconomic factors and neoliberal reforms in Mexico, many community members have migrated to other Mexican states and the United States which has furthered removed Zapotec speakers from the home community. The data for this research is based on 28 open-ended interviews with elders, adults, youth, children, and language activists and participant observation in SJT during the summer of 2013. I argue that the public education implemented by the Post-Revolutionary Mexican state in Tlacochahuaya during the 1930s influenced a language shift to Spanish. Many of those who had a negative schooling experience during this era, which prohibited and punished the use of the Zapotec language in the classroom, choose to raise their children with Spanish. In SJT from 2009-2011 Zapotec tutoring lessons for children were offered by a retired teacher, and since March 2013 migrants residing in Los Angeles, CA have been uploading Zapotec language tutorials on YouTube. Although there is awareness of language loss, I argue that these efforts have been hindered by the absence of a healing process regarding negative schooling experiences and dismantling the language ideologies that continue to devalue the Zapotec language. This case study contributes to the literature of languages shift and revitalization by suggesting that both home and migrant communities have crucial roles in Indigenous language maintenance. / text

This study examines the language choices of Tamil immigrants, part of a South Asian diasporic community, in Austin, Texas. The researcher posits reasons why Tamil language maintenance/shift occurs for this Tamil community in the United States English-dominant macrosociety. The study also examines the domains in which Tamil and English are used and the various sociolinguistic factors which influence the language maintenance/shift of Tamil. Tamil immigrant participants were selected by snowballing, a non-probability purposive sampling technique. This multi-modal study used both quantitative (a questionnaire) and qualitative data (participant interviews and participant observations). One hundred and nineteen questionnaires were collected of which 90 were used for this study. In addition, twelve first or second generation Tamil individuals were interviewed. Background for the study included reasons for emigration from the home country, Tamil diglossia, diaspora issues, identity issues, and language as a site of struggle. The theoretical framework included language as power, language as investment, and linguistic imperialism. Examining the language of instruction, participants interestingly evidenced a kline in English use from 67.1% in elementary grades, to 84.8% in the middle and high/secondary school, to 95.3% at the university level. Also, comparing language use as a child versus language use as an adult, there was a kline (continuum) moving from 'always using Tamil' in all domains as a child to 'equally in Tamil and English' in all domains as an adult. Participants were split as to why they used Tamil with some using it for privacy/secrecy and some using it for pride. A much smaller percent used Tamil for intimacy. Finally, with regard to language proficiency, participants evinced a declining kline from understanding, speaking, and reading, writing colloquial Tamil. The participants' proficiency in literary Tamil was also a declining kline with only 16.7% understanding, 17.8% reading, and even less speaking (8.9%) or writing (7.8%) literary Tamil. The results of this research study and an analysis of Moag’s 31 factors for maintenance/loss of Tamil, showed that the prospects for the continued maintenance of Tamil in Austin were limited. Finally, this study provided valuable sociolinguistic insight into this little-studied South Asian diasporic community in Austin, Texas. / text

Not available / text

published_or_final_version / Mathematics / Master / Master of Philosophy

There exists a fundamental difference in how today's Hopi youth are growing up from that of their parents and grandparents--Hopi youth are not acquiring the Hopi language. This sociolinguistic situation raises many questions about the vitality and continuity of the Hopi language.Two key findings emerged from the study of three Hopi young adults. First, the study showed that cultural experiences are key to developing a personal and cultural identity as Hopi, but a linguistic competence in Hopi, especially in ceremonial contexts, is fundamental to acquiring a complete sense of being Hopi. Secondly, the effect of modern circumstances apparent in behavior and attitude among Hopi is evidence of another shift--a move away from a collective maintenance of language as cultural practice to the maintenance of language and cultural practice as a personal choice of use.

Sonoran Desert Drosophila mettleri breeds in soil soaked by the necrotic cacti juices from saguaro (Carnegiea gigantea) and cardon (Pachycereus pringlei). An isolated population on Santa Catalina Island, 300 kilometers NW of the Sonoran Desert limit, was discovered breeding in several Opuntia cacti species. Host shifts are associated with the speciation process in phytophagous insects. I tested for evidence of premating isolation, postmating isolation, and ecological differences among allopatric populations of Drosophila mettleri using a variety of approaches. No sexual isolation was detected. However, Drosophila mettleri from Santa Catalina Island shows significant behavioral and physiological differences compared with Sonoran Desert populations. Furthermore, Drosophila mettleri from Santa Catalina Island was significantly genetically differentiated from all other populations in the study. Finally, I observed sufficiently significant F1 male sterility in crosses involving the Santa Catalina Island population to consider it indicative of early postzygotic isolation.

Astrophysical models that address stellar energy generation and nucleosynthesis require a considerable amount of input from nuclear physics and are very sensitive to the detailed structure of nuclei, both stable and unstable. Radioactive nuclei play a dominant role in several stellar environments such as supernovae, X-ray bursts, novae etc. and nuclear data are important in the interpretation of these phenomena. When carbon, nitrogen and oxygen isotopes are present in substantial quantities in a star of sufficient mass, the fusion of four hydrogen nuclei to form a helium nucleus proceeds via the CNO cycles. Energy release in the CNO cycles is limited by the long lifetimes of 14O and 15O. In explosive stellar scenarios such as X-ray bursts, the energy output is very large, suggesting a breakout from the CNO cycles. 15O(α,γ)19Ne is the first reaction that breaks out of the CNO cycle. Nuclear structure information on high lying states in 19Ne is required to calculate the rate of the 15O(α,γ)19Ne reaction. This work focuses on the study of states in 19Ne above 3.53 MeV. The lifetimes of five states in 19Ne above 3.53 MeV were measured in this work. The states in 19Ne were populated via the 3He(20Ne,α)19Ne reaction at a beam energy of 34 MeV. The lifetimes were measured using the Doppler Shift Attenuation Method. The lifetimes of five states were measured and an upper limit was set on the lifetime of a sixth state. Three of the measurements are the most precise thus far. The lifetimes of the other three states agree with the values of the only other measurement of the lifetimes of these states. An upper limit on the rate of the 15O(α,γ)19Ne reaction was calculated at the 90% confidence level using the measured lifetimes. The contributions to the 15O(α,γ)19Ne reaction rate from several states in 19Ne at different stellar temperatures are discussed.

In the generational shift, sharing the knowledge of the older generation to the younger coworkers is an important consideration. The aim of this study is to explore knowledge sharing from aging workers to younger workers and the potential of improving knowledge sharing within organizations. A multiple case study was executed in three different organizational contexts: The Municipality, The School and The Manufacturer. The data collection consisted of semi-structured individual interviews, focus interviews, document analyses and statistics. The results were analyzed in within-case and cross-case analysis, triangulated and related to previous research. The conclusion is that knowledge sharing is generally perceived as a ninformal activity and an issue lacking strategic relevance in organizations. There are however possibilities to make knowledge sharing in the generational shift into a legitimate strategic consideration, if activities are formally created to support strategic objectives. A process for choosing and evaluating knowledge sharing programs is presented.

Cheyne-Stokes respiration is a distinct breathing pattern consisting of periods of hyperpnea followed by apneas, with unknown etiology. One in two patients with congestive heart failure suffer from this condition. Researchers hypothesize that key factors in CSR are the fluid shift from the standing to supine position and the differences between genders. A mathematical model of the cardio-respiratory system was constructed using parameter values from real data. Hopf bifurcation analysis was used to determine regions of stable versus oscillatory breathing patterns. In the model, Cheyne-Stokes respiration is more likely to occur while in the supine position and males are more likely to develop Cheyne-Stokes than females. These findings, which are in agreement with clinical experience, suggest that both gender and fluid shift contribute to the pathogenesis of Cheyne-Stokes respiration, and that physical quantities such as blood volumes and neural feedback may be sufficient to explain the observations of CSR. / Department of Mathematics and Statistics

Background: Long-term night shift work has been associated with multiple cancer sites, including breast, prostate, colon and endometrial. The mechanism for this effect is hypothesized to include the hormone melatonin; where increased light at night exposure during shift work reduces melatonin production and decreased melatonin levels are associated with increased cancer risk. In addition, physical activity has been shown to reduce cancer risk and existing laboratory studies indicate it has the potential to influence melatonin levels. Methods: A cross-sectional study of light intensity exposure, physical activity and melatonin levels was conducted among 61 rotating shift nurses at Kingston General Hospital. Light intensity exposure was measured using a light intensity data logger and melatonin concentrations were measured from urine and saliva samples, collected over a 24-hour period. Physical activity was assessed from a study questionnaire and one-day diary. Results: A statistically significant inverse association between light exposure and urinary melatonin levels was observed; however, the relationship was no longer significant when stratified by shift group. Analysis of salivary melatonin levels demonstrated that circadian rhythms of melatonin production in night workers were not altered in timing, such that peak melatonin production occurred at night. No association between light exposure and the magnitude of salivary melatonin variation was observed. The relationship between recent physical activity and melatonin differed by shift group, with a positive association seen among day workers, while an inverse relationship was seen among night workers. There was no association between usual physical activity and melatonin in either shift group. Finally, no significant correlation was observed between sleep duration and melatonin among either day or night workers. Conclusions: While this study demonstrated an inverse relationship between light intensity and melatonin, the comparison of functional time points between day and night workers meant that differences in urinary melatonin levels between shift groups could be attributed to differences in the time of day when urine samples were collected. No consistent relationship between recent or usual physical activity and melatonin levels was observed in either shift group. Sleep duration was not correlated with urinary melatonin levels, suggesting it cannot be used as a proxy for melatonin production. / Thesis (Master, Community Health & Epidemiology) -- Queen's University, 2008-06-26 08:39:21.645