Design for a railroad station

Thesis (BS)--University of Illinois, 1897TypescriptBound with 14 other University of Illinois Architecture theses IU-

Total Marginality: Cumulative Marginality among African American Students at a Predominantly White Institution

This study examines the cumulative nature of marginality felt by African American undergraduates attending a Predominantly White institution (PWI). In-depth semi-structured interviews with ten African American college upperclassmen revealed the need for conceptualization of student marginality at PWIs. The participants detailed their exposure to varying levels of marginality in campus spaces, classrooms, course curriculum, residence halls, the community surrounding the institution, elements of their home environment, and interracial and intraracial interactions with students. This study moves beyond descriptive analyses (Feagin, Vera, & Imani 1996; Davis, Dias-Bowie, Greenberg, Klukken, Pollio, Thomas, & Thompson, 2004; Lewis, Ginsberg, Davis, & Smith, 2004) and offers total marginality as an emergent theory affirming the collective weight of marginality on student development. Recommendations for redressing total marginality are provided

Study of the piezoresistivity of doped nanocrystalline silicon thin films

The piezoresistive response of n- and p-type hydrogenated nanocrystalline silicon thin films, deposited by hot-wire (HW) and plasma-enhanced chemical vapor deposition (PECVD) on thermally oxidized silicon wafers, has been studied using four-point bending tests. The piezoresistive gauge factor (GF) was measured on patterned thin-film micro-resistors rotated by an angle θ with respect to the principal strain axis. Both longitudinal (GFL) and transverse (GFT) GFs, corresponding to θ = 0° and 90°, respectively, are negative for n-type and positive for p-type films. For other values of θ (30°, 45°, 120°, and 135°) GFs have the same signal as GFL and GFT and their value is proportional to the normal strain associated with planes rotated by θ relative to the principal strain axis. It is concluded that the films are isotropic in the growth plane since the GF values follow a Mohr’s circle with the principal axes coinciding with those of the strain tensor. The strongest p-type pirezoresistive response (GFL = 41.0, GFT = 2.84) was found in a film deposited by PECVD at a substrate temperature of 250 °C and working pressure of 0.250 Torr, with dark conductivity 1.6 Ω−1cm−1. The strongest n-type response (GFL =− 28.1, GFT =− 5.60) was found in a film deposited by PECVD at 150 °C and working pressure of 3 Torr, with dark conductivity 9.7 Ω−1cm−1. A model for the piezoresistivity of nc-Si is proposed, based on a mean-field approximation for the conductivity of an ensemble of randomly oriented crystallites and neglecting grain boundary effects. The model is able to reproduce the measured GFL values for both n- and p-type films. It fails, however, to explain the transversal GFT data. Both experimental and theoretical data show that nanocrystalline silicon can have an isotropic piezoresistive effect of the order of 40% of the maximum response of crystalline silicon.Fundação para a Ciência e a Tecnologia (FCT) - PTDC/CTM/66558/2006, bolsa de investigação SFRH/BSAB/883/200

Oscillatory variations in the Q factors of high quality micropillar cavities

We report on the observation of oscillatory variations in the quality (Q) factor of quantum dot-micropillar cavities based on planar Bragg reflectors. The oscillatory behavior in the Q versus diameter dependence appears in the diameter range between 1.0 and 4.0 mu m, has a characteristic period of a few hundred nanometers and increases in amplitude with increasing reflectivity of the planar microcavity structures. The experimental results are well reproduced by numerical calculations which support the interpretation that the Q oscillations are caused by coupling of propagating Bloch modes of different orders at the mirror interfaces.</p

Toward Eco-centric, Earth-as-School, and Love-based Curriculum and Learning: Example of a graduate course

This article puts forward love, care, and reverence for all people and our nonhuman kin as the center of posthumanist education.&nbsp;Opening our spiritual eye and building intimate relationships with nature and with all elements of the universe is envisioned as part of a schooling or post-schooling experience; our body, heart and spirit, along with our mind, is an essential part of learning.&nbsp;The article describes the experiences of students taking a graduate level course focusing on global climate change and education at a university in the United States. We use the course as an example to explore what posthumanist education entails. In this qualitative study, students taking the course, along with the faculty designing and teaching the course, describe the course curriculum and pedagogies and reflect on the course’s impact on them. Data sources include the syllabus, students’ reflection papers, nature contact journals, final projects, art works, and group conversations.&nbsp;Although situated in North America, the article is rich with international perspectives as student authors came from six different countries. The article posits that posthumanist education must be eco-centric and love-based, engaging students’ whole being to feel for and love Mother Nature. Keywords: curriculum, education, nature, posthumanism, climate change, higher education, teaching and learning, contemplative pedagogies, spirituality &nbsp

Influenza D virus: Serological evidence in the Italian population from 2005 to 2017

Influenza D virus is a novel influenza virus, which was first isolated from an ailing swine in 2011 and later detected in cattle, suggesting that these animals may be a primary natural reservoir. To date, few studies have been performed on human samples and there is no conclusive evidence on the ability of the virus to infect humans. The aim of this serological study was to assess the prevalence of antibodies against influenza D virus in human serum samples collected in Italy from 2005 to 2017. Serum samples were analysed by haemagglutination inhibition and virus neutralization assays. The results showed that the prevalence of antibodies against the virus increased in the human population in Italy from 2005 to 2017, with a trend characterized by a sharp increase in some years, followed by a decline in subsequent years. The virus showed the ability to infect and elicit an immune response in humans. However, prevalence peaks in humans appear to follow epidemics in animals and not to persist in the human population

Effect of pure dephasing on the Jaynes-Cummings nonlinearities

We study the effect of pure dephasing on the strong-coupling between a quantum dot and the single mode of a microcavity in the nonlinear regime. We show that the photoluminescence spectrum of the system has a robust tendency to display triplet structures, instead of the expected Jaynes-Cummings pairs of doublets at the incommensurate frequencies $\pm(\sqrt{n}\pm\sqrt{n-1})$ for integer $n$. We show that current experimental works may already manifest signatures of single photon nonlinearities.Comment: v2: 4 Pages,3 figures. New figure 2 and some changes in the text. New author adde