Thesis--Wisconsin. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 94-99).

An Interaction Point Collision Feedback System is necessary to achieve design luminosity at the future International Linear Collider (ILC). This is proposed to include a stripline beam position monitor (BPM) positioned 3 m from the Interaction Point (IP). The BPM is required to be able to measure the position of the outgoing electron or positron beam with a resolution of 1 m. Prototype feedback systems have been built and tested at the Next Linear Collider Test Accelerator (NLCTA) at the Stanford Linear Accelerator Center in the USA (SLAC) and also at the Accelerator Test Facility (ATF) at the High Energy Research Laboratory in Japan (KEK). The successful correction of position osets is demonstrated with the lowest latency achieved 24 ns, the best position resolution 4 m and the best correction ratio 23:1. To make the feedback system a more powerful tool, a digital processor is added. It raises the total latency of the feedback system to 140 ns. Its ability to perform algorithms is demonstrated with charge normalisation. Preliminary results indicate a resolution of 8 m and correction ratio 7:1. Backgrounds at the ILC comprise mainly electron-positron pairs from the beam-beam interaction. For the high luminosity 1TeV accelerator parameters, 105 pairs are produced per bunch crossing. This is the worst case for ILC pair backgrounds. These pairs produce 5 105 particle hits on a stripline of the IP feedback BPM. In two experiments at End Station A (ESA) at SLAC, a stripline BPM was exposed to secondary particle backgrounds to determine if the particle hits degraded the ability of the stripline BPM to resolve micron-level position osets. The experiments agree that the worst ILC pair backgrounds degrade the resolution by less than 8.5 nm (95% confidence level). It is concluded that micron-level resolution will not be aected by the ILC pair backgrounds. Studies of stripline signals caused by backgrounds led to the development of a GEANT3- based tool that could predict the signals. The prediction tool was tested against one of the experiments at ESA and used to predict the signals on the ILC feedback BPM striplines. The results confirm that the ILC pair backgrounds do not produce micron-level errors in position measurement, indicating that the degradation in resolution by the worst pair backgrounds expected was under 13 nm.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1962. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 117-121).

Thesis (Ph. D.)--Washington State University, May 2007. / Includes bibliographical references (p. 245-252).

No description available.

The thesis is a study of illicit drug use and attitudes to drugs education amongst young people from different socio-economic backgrounds. The thesis reviews the existing literature and finds that there may be a link between poverty and drug use that hasn't been fully explored and that there has been a lack of attention to young people's perspectives and views on drug use. The findings are reported of an empirical research project that consisted of quantitative and qualitative research with 206 young people in five different settings: at university, in a youth club, in schools, in a pupil referral unit, and service for young offenders. The data from these different sources are analysed and a conceptual model has been developed, setting out some factors that are indicative of problematic or non-problematic drug use. The model was circulated amongst a small group of professionals in relevant fields for comment. The thesis concludes that young people in university settings reported using illicit drugs recreationally and apparently without problems, while the 'vulnerable' young people reported using more drugs, at an earlier age, and more frequently, and for reasons to do with boredom, depression and anxiety. The author suggests that 'vulnerable' young people are disadvantaged by their circumstances at home, including social deprivation and parental separation, and their lack of engagement with education. It is argued that health promotion models need to recognise the importance of contextual and broader structural factors influencing drug use among young people, and that health promotion efforts need to play a role in tackling inequalities and reducing deprivation, as well as making health promotion messages relevant to their target audience.

This thesis uses CFPS's 2014 and 2016 data, from the perspective of differences in education levels and city size, using the two-way fixed-effect model and quantile regression to explore how the different educational workers' nominal monthly income gap changes with the expansion of the urban population. As for city size, on average, for every 1% increase in city size, the nominal monthly income of workers will increase by 0.4%. For every 1% increase in the size of the city, the nominal monthly wage of the college education group will increase by 0.9%, and the wage of the postgraduate workers will increase almost by 1.2%. The results show that only workers with a college and postgraduate education level can expand the monthly income gap with the lowest educational level group as the urban population grows. However, the nominal monthly income gap between the high-school educated group and junior high school and below educated workers is insignificantly affected by the city's expansion. JEL Classification J31, J23, J26, C51, I18 Keywords Education Level, City Size, Wage Title Wage Differentials by Education level and City Size: Evidence from Chinese cities Abstrakt Tato práce využívá data CFPS z let 2014 a 2016 z pohledu rozdílů v úrovních vzdělání a velikosti města pomocí dvoucestného modelu s fixním...

This study was conducted to determine if varying amounts of mathematics preparation and varying attitudes toward mathematics by teachers had a significant effect on the mathematics performance of their eighth grade students. Mathematics preparation was determined by the total number of college credits a teacher had accumulated and attitude toward mathematics was determined by a survey using the Revised Math Attitude Scale authored by Aiken and Dreger in 1961. In addition to mathematics preparation and attitude, the teacher characteristics of sex, age, years of experience, ethnicity, and type of certification were also observed and analyzed in relation to student performance. The sample population consisted of 30 eighth grade teachers from 10 middle schools in a large southwestern metropolitan school district and their 1,368 students. Student performance was measured by using the student math scores from the Iowa Test of Basic Skills. All variables in the study were tested at the .05 level of confidence using multiple regression and analysis of variance. None of the variables were significant predictors of student performance when the teachers were analyzed as an entire group. When divided into subgroups by student achievement levels, teachers with greater amounts of preparation had a significant effect at the .05 level of confidence with high achievement students; teachers with high attitudes toward mathematics had a significant effect at the .05 level of confidence for students of medium achievement. All other variables were insignificant for the subgroups. Conclusions were drawn that the individual teacher characteristics examined were not significant predictors of student performance unless students were grouped by achievement levels. This indicated that "more" in terms of math preparation for teachers or the concept of being a specialist at the middle school level was not a significant predictor of teacher effectiveness.

No description available.

The SNO+ experiment will be the SNO detector filled with a neodymium-loaded liquid scintillator instead of heavy water. SNO+ will be used to detect neutrinos of much lower energy. Also, SNO+ will conduct a search for neutrinoless double beta decay with Nd-150. The Nd-loaded scintillator in SNO+ will be made from linear alkylbenzene (LAB). Both the LAB solvent and the Nd loading are new developments. The optical properties of this scintillator and information about radioactive backgrounds should be studied. A calibration source known as the scintillator bucket was deployed in the water-filled SNO detector in order to study some optical properties of Nd-loaded scintillator, raw LAB scintillator and distilled LAB scintillator. Using a neutron source attached to the bucket to produce events with known energy, with a model of the scintillator bucket simulated by an analysis tool called RAT, the light yield of the scintillator could be determined by comparing data measurements with simulations. This allowed the light yield, one of the main optical properties of the scintillator, to be measured and that value to be corrected in the Monte Carlo. The bucket was deployed both at the centre of the detector and at the bottom. After subtracting backgrounds from radon introduced in the scintillator during preparation and filling, constraints on the amount of Po-210 were obtained. Estimates on the K-40 content of the Nd-loaded scintillator were obtained by analyzing the radon-subtracted background spectra. By comparing the background spectra with the bucket deployed at the bottom of the acrylic vessel with spectra from the bucket at the centre, it was possible to estimate the K-40 content of the acrylic vessel. / Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2010-09-22 11:55:44.351