The Bahamian Archipelago is one of the few locations in the world where ooid formation is actively occurring. Ooid cortices from six locations in the region were incrementally dissolved and analyzed for 14C, δ18O, δ13C, Mg/Ca and Sr/Ca ratios. Ooids were examined under SEM after each step in the incremental analyses to characterize the nature of dissolution. Radiocarbon dating indicates that surface ooids began forming across the Archipelago between 1000 and 2800 yr BP and continue to form today. The ooids have the same pattern of microboring alteration across the region. The surface and outer cortex of the ooids are punctuated with unfilled microborings, whereas the inner cortex contains two morphologies of aragonite cement filling the microborings. The two morphologies of cement form in association with two different species of cyanobacteria, one is Solentia sp. the other is interpreted to be Hyella sp.. The chemistry of ooids from across the region is remarkably similar. δ18O and δ13C values for all samples vary directly, having a slope of approximately 1. The outer cortex has low δ18O and δ13C values of -3.4‰ and 0.2‰ respectively, whereas the δ18O and δ13C values of the inner cortex are high with values of 1.9‰ and 6.8‰ respectively. The presence of aragonite cement in microborings in the inner cortex increases the overall isotopic composition of both oxygen and carbon in the ooid, causing it to appear close to equilibrium with seawater. The isotopic variation in δ18O and δ13C within the cortex can be characterized as a mixing line between the low values in the unaltered ooid laminae and the aragonite cement in the microborings. The most exterior portion of the ooid has very high Mg/Ca values and is interpreted as an amorphous calcium carbonate (ACC) coating. There are two other phases in the cortex, both being aragonite. The outer cortex has a higher Mg/Ca ratio and lower Sr/Ca ratio than the inner cortex. This difference in chemistry is a result of the presence of aragonite cement in the inner cortex. Stable isotopic and trace element results coupled with SEM investigations indicate that microbes do not play a role in ooid formation, but instead alter the texture and chemistry of ooids after they have formed. This alteration occurs throughout the entire shoal region. A new model of ooid formation is proposed whereby a veneer of ACC precipitates on an ooid while it is at the sediment-water interface (the active phase). This veneer of ACC later recrystallizes to aragonite needles, possibly nucleating on organic material and a new cortex layer is formed. Observations from this study lead to a deeper understanding of the chemical processes involved in ooid genesis, which allows for a better understanding of paleoenvironments hosting ooid formation. / Thesis (Master, Geological Sciences & Geological Engineering) -- Queen's University, 2009-01-27 13:29:42.765

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This research is an integrated geological and geomorphological study into the Denton Hills area. The study area is part of the foothills to the Transantarctic Mountains, which divides East and West Antarctica, allowing an opportunity to investigate glacial events from both sides. As the study area is ice-free, it has allows good examination of the bedrock geology and has preserved geomorphological features allowing them to be examined and sampled. Comprehensive geological map and geomorphological maps have been produced, extending the knowledge into the spatial distribution of units and features. Both the geological and geomorphological maps reveal a complex history of evolution. The original geological units have been subjected to deformation and intrusion of large plutons. The geomorphological mapping shows ice has flowed in alternate direction through the valleys, and the valleys have had long periods where they have been occupied by large proglacial lakes. As the Antarctic ice sheets expanded they flowed into the valleys either from the west, the Royal Society Range draining the East Antarctic Ice Sheet or from the east, McMurdo Sound. Ice would flow from McMurdo Sound when the West Antarctic Ice Sheet expanded causing the grounding line of the ice sheet to move north through the Ross Sea. Surface exposure dating completed during the study has correlated the timing of glacial events to global cycles. The dating confirmed the presence of the large proglacial lake during the Last Glacial Maximum in the Miers Valley, which drained about 14 ka. The Garwood Glacier has also been directly linked to the Last Glacial Maximum with a moraine forming about 22 ka. The dating has also shown that during the Last Glacial Maximum there was little fluctuation in the size of glaciers draining the East Antarctic Ice Sheet, with features being date to the onset of the Last Glacial Maximum.

The purpose of this creative project is to report on the beginning stage of a heuristic analysis project. The purpose is to examine the problem of declining marriage numbers that face the Protestant Evangelical community, and address that dilemma in the design criteria of an online dating website. Clarifying values will be part of the analysis of the Evangelical culture inequities. In particular, by assessing Evangelical culture to form the basis of site design, and making recommendations of action that can free it from its current constraints with respect to online dating. A study of the Marry Well Website will include investigating the perceived problems by the laity in connection with online dating. The research here is predictive in nature, in that the study creates a set of questions that can set in motion further research. / Department of Telecommunications

The purpose of the current study is to understand the reintroduction of taboo topics between romantic dating partners. Through a qualitative methodological approach, the current study discovers the most prominent taboo topic between romantic partners, why romantic partners reintroduce taboo topics, and what effect the reintroduction has on the relationship. The findings present that “previous relationships” is the most prominent taboo topic. Partners either avoid the taboo topic discussion altogether or the taboo topic discussion is reintroduced because a situation occurred in which one partner saw, spoke with, or spent time with a previous partner. Finally, the current study found that reintroducing taboo topics causes conflict and the use of self-protective mechanisms within the relationship. / Department of Communication Studies

This study used multiple regression analysis to determine which of the Riggs and O'Leary's (1989) background-situational model variables best predict the pattern of dating violence in heterosexual Batswana college students' relationships. The background variables included in the study are (a) exposure to interparental violence, (b) gender-role attitudes, and (c) acceptance of aggression as a response to conflict. One situational variable-the partner's use of aggression is included in this study. This situational variable was included because of its central role in the background-situational model and because Riggs and O'Leary (1989) identified it as a potentially important situational predictor of dating aggression. Although the variables selected for use in this study are far from exhaustive, the use of restricted models has been identified as a useful heuristic in the study of interpartner aggression (O'Leary, 1988). The use of multiple regression procedures in this study can be expected to yield a more comprehensive understanding of the factors that are associated with the likelihood of Batswana college students to engage in dating violence. It also permits for the study of the predictive power of variables within the context of other more or less powerful predictors.The study's sample were 135 female and 118 male undergraduate students recruited from a university in Botswana. Participants ranged in age from 18 to 25 years old, were unmarried, were involved in a heterosexual dating relationship or had been involved in one such relationship in the past. Participants completed a set of questionnaires, including the revised Conflict Tactics Scales, the parents' version of the Conflict Tactics Scales, the partners' version of the Conflict Tactics Scales, the Attitudes Toward Women Scale, and the Attitudes About Dating Violence Scale. The combination of exposure to interparental violence, gender-role attitudes, acceptance of aggression as a response to conflict, and partners use of aggression, with demographic variables held constant, was significant and accounted for 89% of the variance in participants' perpetration of dating violence. Results indicated that partner's use of violence is a strong predictor of dating violence perpetration. Implications from this study are offered. / Department of Counseling Psychology and Guidance Services

第23回名古屋大学年代測定総合研究センターシンポジウム平成22(2010)年度報告

Dating violence (DV) is a common experience among college-age Canadians, affecting between one quarter and one third of both men and women. A significant predictor of DV perpetration and victimization is childhood physical abuse (CPA). While there is evidence of an intergenerational transmission of violence from CPA to both victimization and perpetration of DV in young adulthood, there remain gaps in our understanding of what factors influence these relationships throughout an individual’s development. Using survey data collected from a convenience sample of 660 University of Manitoba students, this study analyzed the strength of a model of violence development from CPA to DV including the mediating effects of personality symptoms and attachment security. The current study suggested partial support for theoretical frameworks that have been applied to the understanding of the relationship between CPA and DV, namely social learning theory, the criminological framework, and attachment based theories. CPA was correlated with DV perpetration and victimization. However, in multivariate analyses, witnessing interparental violence, rather than experiencing CPA, was a direct predictor of DV perpetration and victimization. CPA predicted DV indirectly through witnessing interparental violence. More severe dating violence items were significantly predicted by other variables in the model. Antisocial personality symptoms increased odds of severe DV perpetration and victimization while borderline personality symptoms increased odds of severe DV victimization. Attachment insecurity had the strongest impact on dating violence perpetration in the female subsample. These findings, suggesting a number of distinct pathways in the intergenerational transmission of violence, should be further tested in larger and more diverse samples. It would be beneficial to include additional risk and protective variables in future research in order to understand what impacts each distinct pathway to dating violence, under what circumstances, as well as the influence of these variables at different points in individuals’ development. This research is valuable for understanding the impact of childhood abuse on young adult attachment, personality, and dating violence. Further, it is hoped that this research will be helpful for establishing appropriate and comprehensive DV interventions which take into account mediating influences from the intergenerational transmission of violence.

The validation and potential use of mathematical models to estimate the shelf-life of refrigerated food exposed to temperature abuse and basing such estimations on microbial growth was analyzed. Combined heat transfer, microbial growth models, and non-parametric statistical procedures formed a computer-based predictive tool to assess shelf-life and estimate the accuracy of the prediction. Experiments were carried out to assess the precision of the combined model parameters. The different situations analyzed considered stepwise fluctuations in environmental temperature and a change in package characteristic (size and packaging material). Computer simulations showed that even when the temperature abuse period constitutes a small fraction of the total exposure time (2%-3%), shelf-life can be highly affected (20%-30%). To analyze the precision of the combined model response, two sources of variation were considered, microbial growth and heat transfer parameters. First order, pseudo-zero order kinetics and Arrhenius model formed the basis for the microbial model. The accuracy of lag and exponential phase of microbial growth for a mixture of three microorganisms (P. fluorescens, S. aureus, and A. Iwoffi) was assessed using a nonparametric statistical procedure based on the bootstrap method. The activation energy (E [subscript a]) and the logarithm of the frequency factor (InK₀) were found to be 109±3.4 J/mole and 48.3±1.5 for the exponential phase of this microbial mixture. The values for the exponential phase were 152±4 J/mole and 64.0±1.7, respectively. These parameters together with experimental values for the overall heat transfer coefficient were used to analyze the precision of the model response. This precision was not affected by a change in environmental temperature and packaging characteristics and remained constant at ±1 day. Two different temperature abuse situations yield estimated shelf-life of 4.8±1 and 8.9±1 day, respectively. This result can not be generalized as it depends on the particular examples analyzed. / Graduation date: 1993