No description available.

This thesis discusses the design, fabrication, and testing of a high efficiency, dual band radio frequency power amplifier. While it is difficult to demonstrate an exact mode of operation for power amplifiers at radio frequencies, based on the characteristics of the transistor itself, the argument can be made that our high efficiency performance is due to an approximation to class E operation. The PA is designed around a CGH40025 transistor manufactured by Cree, Inc, which has developed a very useful nonlinear model of its transistor, which allows use of software load/source pull methods to determine optimum impedances to be presented to the gate and drain (hereafter referred to as source and load) of the transistor at each band of operation. A recent work on dual-band impedance matching is then used to design distributed element networks in order to present conjugate matches of these impedances to the transistor. This is followed by a careful layout, after which the PA is then fabricated on a low-impedance substrate using a LPKF Protomat S63 rapid prototyping machine. Measurements of gain and drain current provide values for power-added-efficiency. Simulated gains were 21 and 18 dB at 800 MHz and 1.85 GHz, respectively, with PAE around 63% for both bands. Measurements taken from the fabricated PA showed gains of 20 and 16 dB at each band, but PAE of 80% at 800 MHz and 43% at 1.85 GHz.

The thesis addresses the relationship of class size to student performance in a rural state. It presents findings from a longitudinal study of a cohort of students who were tested with state assessments at grade 4 in 2000, again at grade 8 in 2004 and, finally at grade 10 in 2006. Graduation rates for five large-class sized schools and five small-class sized school populations were established in 2008. All scores (n=1137) were matched across time enabling students from similar socioeconomic backgrounds from schools that were considered small (average class size, n=11) to schools that were large (average, n= 20). The paper’s focus is on the extent that students from schools that maintained large and small classes differed in selected opportunities to learn and educational outcomes. The approach to the study utilized both large scale state databases for student backgrounds and outcomes and interviews with school personnel in order to identify school policy and practices that might be linked to performance differences. The primary goal of this research study was to determine if small classes resulted in improved student achievement compared to those students in larger classes. Although Vermont does not have the large class sizes of the quasi-experimental studies and policy initiatives cited in the literature, it does have a wide range of average class sizes. The targeted high school math and English classes of this study ranged from an average of 11 students in the average small class to 20 in the average large class. If class size were a critical influence on students’ academic achievement, one would expect to see significant differences between students who were educated in classes nearly twice as large as other classes. This study concludes that there was no such difference. In terms of academic achievement, with the exception of 10th grade math scores, students in larger classes performed the same or better than students in smaller classes. Students in larger classes had slightly higher graduation rates, and a larger proportion planned to attend two or four year colleges.

I create oil paintings and drypoints that bring attention to scenes of American middle class life. I present crowds of people engaged in community activities and festivals. This enables me to depict a cross section of the residents of a given region. I also create a counterpoint to these peopled gatherings by painting and drawing the exteriors of middle class homes. In my work, I attempt to imbue a sense of intrigue and pathos. I work from candid photos that I take of people and their living spaces. In these photos, I modify and delete elements to optimize narrative and drama. I use natural light to define hard shadows and bright hues or light values to define forms.

No description available.

Thesis (Ed.D.)--Boston University. Note: Missing page 366.

Thesis advisor: Bernard O'Brien / This study Investigated factors underlying marital stability in twelve working class couples who had been married at least twenty years, and whose youngest child was eighteen or older. A qualitative approach was used to elucidate the meaning of each individual's experience of marriage, with a focus on gender differences. Marriage was conceptualized developmentally in three phases: 1) pre-child rearing; 2) child rearing; and 3) post-child rearing. A semi-structured interview was used to elicit information regarding initial attraction, expectations, roles, communication, problem-solving, handling interpersonal differences, child rearing, intimacy, sexuality, relationship variables (understanding, sensitivity, respect, trust) and equity with regard to each phase. The influence of external factors (finances, ethnicity, culture), religion, and participants' families of origin on the marital relationship were discussed as well. Nine salient themes emerged from the data: initial attraction, expectations, marital behavior (including child rearing), relatedness, values, finances, influence of family of origin, marital satisfaction, and change over time. Relatedness was the core category, encompassing eight other themes: positive regard for the relationship, intimacy, relationship variables (understanding, sensitivity, respect, trust), communication, style of handling interpersonal differences, marital conflict, equity, and sexuality. / Thesis (PhD) — Boston College, 1993. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Education.

刁鵬飛. / "2002年6月" / 論文 (哲學碩士)--香港中文大學, 2002. / 參考文獻 (leaves 115-119) / 附中英文摘要. / "2002 nian 6 yue" / Diao Pengfei. / Lun wen (zhe xue shuo shi)--Xianggang Zhong wen da xue, 2002. / Can kao wen xian (leaves 115-119) / Fu Zhong Ying wen zhai yao. / 論文摘要 --- p.i / 致謝 --- p.iii / 目錄 --- p.iv / 圖表 --- p.v / Chapter 第一章 --- 硏究簡介 --- p.1 / Chapter 第二章 --- 理論的探討 --- p.12 / Chapter 第三章 --- 白領個案面面觀 --- p.27 / Chapter 第四章 --- 白領的個人生活軌迹和制度變遷 --- p.48 / Chapter 第五章 --- 排斥舊的階級劃分 --- p.69 / Chapter 第六章 --- 白領的態度和期望 --- p.84 / Chapter 第七章 --- 結論 --- p.101 / 附錄 --- p.113 / 參考書目 --- p.115

Thesis (B.Sc)--University of Hong Kong, 2006. / Includes bibliographical references (p. 177-195)

Thesis (M. Ed.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.