Braid groups of imprimitive complex reflection groups

We obtain new presentations for the imprimitive complex reflection groups of type $(de,e,r)$ and their braid groups $B(de,e,r)$ for $d,r \ge 2$. Diagrams for these presentations are proposed. The presentations have much in common with Coxeter presentations of real reflection groups. They are positive and homogeneous, and give rise to quasi-Garside structures. Diagram automorphisms correspond to group automorphisms. The new presentation shows how the braid group $B(de,e,r)$ is a semidirect product of the braid group of affine type $\widetilde A_{r-1}$ and an infinite cyclic group. Elements of $B(de,e,r)$ are visualized as geometric braids on $r+1$ strings whose first string is pure and whose winding number is a multiple of $e$. We classify periodic elements, and show that the roots are unique up to conjugacy and that the braid group $B(de,e,r)$ is strongly translation discrete.Comment: published versio

Estimating exposure response functions using ambient pollution concentrations

This paper presents an approach to estimating the health effects of an environmental hazard. The approach is general in nature, but is applied here to the case of air pollution. It uses a computer model involving ambient pollution and temperature input to simulate the exposures experienced by individuals in an urban area, while incorporating the mechanisms that determine exposures. The output from the model comprises a set of daily exposures for a sample of individuals from the population of interest. These daily exposures are approximated by parametric distributions so that the predictive exposure distribution of a randomly selected individual can be generated. These distributions are then incorporated into a hierarchical Bayesian framework (with inference using Markov chain Monte Carlo simulation) in order to examine the relationship between short-term changes in exposures and health outcomes, while making allowance for long-term trends, seasonality, the effect of potential confounders and the possibility of ecological bias. The paper applies this approach to particulate pollution (PM10) and respiratory mortality counts for seniors in greater London (≥65 years) during 1997. Within this substantive epidemiological study, the effects on health of ambient concentrations and (estimated) personal exposures are compared. The proposed model incorporates within day (or between individual) variability in personal exposures, which is compared to the more traditional approach of assuming a single pollution level applies to the entire population for each day. Effects were estimated using single lags and distributed lag models, with the highest relative risk, RR=1.02 (1.01–1.04), being associated with a lag of two days ambient concentrations of PM10. Individual exposures to PM10 for this group (seniors) were lower than the measured ambient concentrations with the corresponding risk, RR=1.05 (1.01–1.09), being higher than would be suggested by the traditional approach using ambient concentrations

Assessment of the Intake and Knowledge of Folate/Folic Acid Among UNH Students

There are 3,000 U.S. pregnancies affected by spina bifida and anencephaly annually. If women consume adequate amounts of folic acid (400 mcg/day) one month before pregnancy and through the first trimester, then the risk of their infant developing a neural tube defect (NTD) is reduced by 50-70%. However, approximately 50% of pregnancies are unplanned, with some of the highest rates among 18-24 year olds. The purpose of this study was to evaluate the knowledge source, knowledge level, and intake of folic acid among college-aged students. Qualtrics surveys from 96 subjects (87.5% female, aged 18-24) were used for analysis. In the female sample, 16% were taking a multivitamin containing folic acid and 7% a folic acid supplement. Three questions assessed the sample’s level of folic acid knowledge. Seventy-six percent knew adequate amounts are needed to prevent NTDs, 71% knew it is most important to start consuming it before pregnancy, and 54% answered at least half of the correct food sources. There were 19 females who took an introductory nutrition course, and 63.2% correctly answered NTDs, before pregnancy, and at least half the food sources. Subjects who got folic acid knowledge from a college course were significantly more likely to answer the three questions correctly compared to those who never received information on the vitamin. Findings suggested that among college students, the best source of information about folic acid is college courses. Future research may study the correlation between folic acid knowledge and knowledge source among a larger, more diverse college population

The construction and administration of a questionnaire on children's reaction to educational television

Thesis (Ed.M.)--Boston University N.B.: Missing pages 93-111. Possibly misnumbered

Temptation

Temptation is an exploration of lust and the barrier between two worlds as they collide

Social Reformers and Regulation: The Prohibition of Cigarettes in the U.S. and Canada

The apogee of anti-smoking legislation in North America was reached early in the last century. In 1903, the Canadian Parliament passed a resolution prohibiting the manufacture, importation, and sale of cigarettes. Around the same time, fifteen states in the United States banned the sale of cigarettes and thirty-five states considered prohibitory legislation. In both the United States and Canada, prohibition was part of a broad political, economic, and social coalition termed the Progressive Movement. Cigarette prohibition was special interest regulation, though not of the usual narrow neoclassical genre; it was the means by which a group of crusaders sought to alter the behavior of a much larger segment of the population. The opponents of cigarette regulation were cigarette smokers and the more organized cigarette lobby. An active Progressive Movement was the necessary condition for generating interest in prohibition, while the anti-prohibition forces played a more significant role later in the legislative process. The moral reformers' succeeded when they faced little opposition because few constituents smoked and/or no jobs were at stake because there was no cigarette industry. In other words, reform is easy when you are preaching to the converted.

"Our fingers were never idle" : women and domestic craft in the Geelong region, 1900-1960

This thesis is an exploration of women\u27s domestic crafts in the Geelong region, between 1900 and I960, Through analysing oral testimony and the women\u27s handicraft artefacts, the nature of the domestic production of handicrafts and the meanings the makers have constructed around their creations and their lives is illuminated. The thesis is organised around the themes of work, space, the construction of femininity, memory, time and meaning. The thesis argues that until recently, the discipline of history has privileged the experiences of men over those of women. It challenges the trivialising of women’s handicrafts. It also argues that within the restrictive social structures around them and within the confined nature of their situations, the women of my study asserted themselves to transform their environments and to improve their situations through labour in the home. In ‘making do’, recycling materials and creating functional and decorative needlework items for their homes and families, the women were often finding solutions to pressing practical and economic problems. Doing handicrafts was rarely just a passive way of filling in time. Rather, making and creating was for these women a multi-layered activity that similtaneously fulfilled a complex range of needs for themselves and their families. A multiplicity of deeply personal, aesthetic, familial, social, practical and economic needs were met in the making of domestic craft artefacts, whose symbolism reflected the values and meanings of the women\u27s cultures, homes and families

Building spelling power: word analysis lessons for grade 2.

Thesis (Ed.M.)--Boston Universit