This ethnographic study investigates the language ecology of Urumchi, Xinjiang with a focus on contextual factors as related to the language practices of Uyghur young adults. The thesis explores how the migration and settlement of Han Chinese, coupled with the expansion of Mandarin (and corresponding marginalization of Uyghur and other ethnic minority languages) in the Xinjiang education system has resulted in a punctuation of the linguistic equilibrium of the province. This study demonstrates how socio-political forces contribute to the devaluation of minority linguistic capital in a linguistic market, and how a language policy in the domestic field, as the primary structuring structure, may be utilized to stabilize diglossia and maintain the intergenerational transmission of a minority language. Participant observation, interview and documentary data were collected over an 18-month period of fieldwork in Urumchi. The analysis of interview data from 26 Uyghur adults, defined as early to mid-twenty years of age, who had been educated in Mandarin classes (mínkăohàn), Uyghur classes (mínkăomín), and bilingual Mandarin-Uyghur classes (shuāngyǔ) or a combination of these programs yielded four themes: context and language investments; expected returns; language choice; and linguistic anxiety. The data suggests a high degree of ambivalence among Uyghur young adults toward Mandarin; this form of cultural capital is conceived of as requisite for participation in the Han Chinese dominated economy, yet of a colonial nature and damaging to the demarcation of Uyghur social identity. Case study narratives are presented on four Uyghur young adults: one female educated in Mandarin classes (mínkăohàn); one male educated in Mandarin classes (mínkăohàn); one female educated in Uyghur primary and Mandarin-Uyghur secondary classes (mínkăomín/shuāngyǔ); and one male educated in Uyghur primary and Mandarin-Uyghur secondary classes (mínkăomín/shuāngyǔ). Each case study consultant completed a 94-item expressive vocabulary assessment. The data suggests that the expansion of Mandarin as the language of instruction in the Xinjiang education system has resulted in unstable diglossia among Uyghur communities, evidenced by Uyghur language attrition and Mandarin-Uyghur code-switching. Findings emphasize contextual factors that are contributing to the disruption of the intergenerational transmission of Uyghur and actions to support the vitality of this cultural heritage. / text

Background Night shift work is inevitable for maintaining continuous services in different sectors e.g. healthcare, financial, transport and service sectors. Night shift work increases exposure of light at night. Exposure of light at night suppresses production of a neurohormone melatonin. Melatonin has shown potential cancer protective action in animal experiments. Melatonin deficiency is suggested to be related to the development of various cancer especially breast cancer. Breast cancer incidence in Hong Kong is rising. Particular concern about association between night shift work and breast cancer is raised. Objective To collect evidence from studies of other countries with study populations of different professions and to evaluate the relationship between night shift work and breast cancer Method MEDLINE was searched to identify publications, limited to English articles, from 1973 to May 2011. Search terms include (circadian rhythm or night work or night shift or shift work or work schedule tolerance) and (cancer or neoplasm or neoplasia) and (risk or rate or incidence). No restriction was set to the publication type. Results Altogether 343 titles retrieved from MEDLINE search. Finally, 8 primary observational studies that met inclusion criteria were identified for this review. Of these, two were prospective cohort studies, one was retrospective cohort study, two were nested case-control studies and three were case-control studies. Most of the study had crude exposure assessment of night shift work, in which four studies relied on group level of exposure probability instead of individual exposure information. Six of eight studies showed positive results on the association of night shift work and breast cancer in women. Three studies found that risk of breast cancer was increased significantly for those who had engaged in night shift work in a long duration i.e. more than 20-30 years, but they were all conducted in populations of same occupational group i.e. nurse and only a moderate increase of breast cancer risk was found. The results were subject to confounding and bias. No consistent results were found for effect of shorter duration of night shift work on risk of breast cancer. Conclusion Based on the studies included, there is suggestive evidence of an association of night shift work and breast cancer. Further studies on this are needed. Involvement of population of different occupational groups, controlling confounder of hormone use and conducting exposure assessment with high reliability using individual information instead of that from group are suggested. / published_or_final_version / Community Medicine / Master / Master of Public Health

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

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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.