52 research outputs found

    Non-Abelian Braiding of Lattice Bosons

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    We report on a numerical experiment in which we use time-dependent potentials to braid non-abelian quasiparticles. We consider lattice bosons in a uniform magnetic field within the fractional quantum Hall regime, where ν\nu, the ratio of particles to flux quanta, is near 1/2, 1 or 3/2. We introduce time-dependent potentials which move quasiparticle excitations around one another, explicitly simulating a braiding operation which could implement part of a gate in a quantum computation. We find that different braids do not commute for ν\nu near 11 and 3/23/2, with Berry matrices respectively consistent with Ising and Fibonacci anyons. Near ν=1/2\nu=1/2, the braids commute.Comment: 5 pages, 1 figur

    Virtually Authentic: Graduate Students’ Perspective Changes toward Authentic Learning while Collaborating in a Virtual World

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    This qualitative case study investigates graduate students’ perspective changes apropos their cross-national collaborative learning experience while participating in an online teaching and learning course jointly taught by graduate schools in the United States and Israel. The participants met virtually, on a weekly basis between November and December 2018, on a platform called Second Life, to design and participate in collaborative learning activities. On completion of the course, interviews were conducted with a small sample of student-participants regarding their experiences. During the design phase, participants’ dominant perceptions of their learning experiences were characterized by genuine “excitement” at the novelty of collaborating virtually with colleagues on the other side of the world. Their initial perceptions evolved during the participation phase to realization as learning communities emerged and students’ roles expanded beyond the scope of mere participants. In this study, the authors argue that participants’ construction of new knowledge resulted in authentic learning from the standpoints of social constructivism and online collaborative learning theory and further discuss the factors that enabled the participants’ authentic learning experience

    How Korean K-12 Educators Adapted to Online Teaching and Promoted Digital Equity During COVID-19: A Mixed-Method Study on Practices and Perceptions

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    The abrupt transitions to online teaching during COVID-19 have exacerbated educational discrepancies worldwide. South Korean schools faced similar challenges primarily due to the insufficient infrastructure and pedagogical guidelines for online teaching. This mixed-method case study investigated how Korean K-12 teachers and administrators converted to online teaching and addressed related digital equity issues during their first semester of online teaching in response to the pandemic. Interviews, as well as survey responses at the beginning and end of the semester, were analyzed through Activity Theory (AT) and Technological Pedagogical Content Knowledge (TPACK) frameworks. The study's key insights were that the digital equity issue is related to quality teaching issues beyond infrastructural problems and that teachers took various strategies to maximize the effectiveness of their blended teaching. We aim to shed light on supporting equitable online learning and sustaining positive changes in the post-COVID era

    Evaluation Report: Southwest Navajo Nation Virtual Alliance

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    The project provided all 110 chapter houses of the Navajo Nation with high speed internet. Report includes internet usage survey of Navajo users

    An electronic nose discriminates exhaled breath of patients with untreated pulmonary sarcoidosis from controls

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    Sarcoidosis is a systemic granulomatous disease of unknown cause that affects the lungs in over 90% of cases. Breath analysis by electronic nose technology provides exhaled molecular profiles that have potential in the diagnosis of several respiratory diseases. We hypothesized that exhaled molecular profiling may distinguish well-characterized patients with sarcoidosis from controls. To that end we performed electronic nose measurements in untreated and treated sarcoidosis patients and in healthy controls. 31 sarcoidosis patients (11 patients with untreated pulmonary sarcoidosis [age: 48.4 ± 9.0], 20 patients with treated pulmonary sarcoidosis [age: 49.7 ± 7.9]) and 25 healthy controls (age: 39.6 ± 14.1) participated in a cross-sectional study. Exhaled breath was collected twice using a Tedlar bag by a standardized method. Both bags were then sampled by an electronic nose (Cyranose C320), resulting in duplicate data. Statistical analysis on sensor responses was performed off-line by principal components (PC) analyses, discriminant analysis and ROC curves. Breathprints from patients with untreated pulmonary sarcoidosis were discriminated from healthy controls (CVA: 83.3%; AUC 0.825). Repeated measurements confirmed those results. Patients with untreated and treated sarcoidosis could be less well discriminated (CVA 74.2%), whereas the treated sarcoidosis group was undistinguishable from controls (CVA 66.7%) Untreated patients with active sarcoidosis can be discriminated from healthy controls. This suggests that exhaled breath analysis has potential for diagnosis and/or monitoring of sarcoidosi

    Joan HughesTHE PERSONALITY TRAITS OF INSTRUMENTALITY AND EXPRESSIVENESS IN RELATION TO MICROCOMPUTER PLAYFULNESS

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    This dissertation is dedicated to my grandfather, Herbert Coleman, for whom I was named and countless other African-Americans who never had the opportunities I have to pursue an education. It is also dedicated to my parents Nora A. Brumsey and Edward I. Coleman who both taught me, in so many ways, that gender does not have to define your role or who you are. Acknowledgments There are so many people I need to thank for their encouragement, support, guidance and patience while I pursued this study of interest. First, I thank my family, friends, and colleagues who listened to me talk about computers and gender personality traits for 14 years and still remained supportive and encouraging of my efforts to investigate this relationship. Secondly, to the Austin Community College District that supported me, encouraged me, provided supervisors who allowed the time off needed, and provided a laboratory for me to conduct my investigation. Also, to the ACC students who participated in the study, without whom the research would not have been possible, I say, thank you. I need to thank the University of Texas at Austin, Department of Education
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