Pressurized chemical looping combustion (PCLC) is a promising next generation carbon capture technology which operates on the fundamentals of oxyfuel combustion to concentrate carbon dioxide in the flue gas stream. Oxygen is supplied through cyclic oxidation and reduction of a solid metal oxide between an air reactor and fuel reactor to prevent the direct contact of fuel and air. CanmetENERGY-Ottawa, in collaboration with Hatch Ltd., is designing a pilot scale PCLC system which uses ilmenite as the oxygen carrier and a novel fluidized bed design called the Plug Flow Internally-recirculating Reactor (PFIR). The PFIR consists of an annular bubbling fluidized region in which particles are circulated by angle jets through two reactive zones separated by baffles. The overall objective of this thesis was to provide key design parameters and insight for the construction of the pilot facility. Experimental work was first conducted investigating the minimum fluidization velocity (Umf), gas bubble size, and tube-to-bed heat transfer coefficients of different ilmenite particle size distributions (PSDs) at varying pressures up to 2000 kPa. The data was compared to a variety of literature correlations. The Saxena & Vogel (1977) constants for the Wen-Yu type correlations (Remf=√C12+C2Ar-C1) resulted in the best fit for predicting the Umf of the PSDs with Sauter mean diameters (SMD) less than 109 μm, while the Chitester et al. (1984) constants resulted in better predictions for the larger particle size distributions (SMD greater than 236 μm). Gas bubble size was found to be marginally impacted by pressure, with the Mori & Wen (1975) correlation best fitting the data. The heat transfer coefficient was found to also be marginally increased by pressure with the the Molerus et al. (1995) correlation matching the atmospheric data. A computational particle fluid dynamic (CPFD) model of the experimental unit was then created and validated using the obtained data for minimum fluidization velocity and bubble size. The accuracy of the model was found to be dependent on the particle close packing factor input variable, with a value of 0.58 resulting in the best results for each of the ilmenite PSDs modeled. Finally, a CPFD model was created for a cold flow design of the PFIR to investigate the impacts of different operating parameters on the solids circulation rate and gas infiltration rate between the two reactor zones. This model used the validated parameters of the previous CPFD model to add confidence to the results. The impacts of increasing superficial gas velocity, fluidizing gas jet velocity, bed height, and pressure were all found to increase the solids circulation rate through their respective impacts on the momentum rate of the fluidizing gas. A polynomial function was fit between these two variables resulting in a method to predict the solids circulation rate. Similarly, the rate of gas infiltration between sections was found to be dependent on the solids circulation rate, allowing for a function to be made to predict the gas infiltration at different operating conditions.

The integration of Ukrainian Internally Displaced Persons (IDPs) in host communities is as multi-dimensional as the political crisis of 2014 that led to the displacement. Having made a difficult choice to let go of their past lives to escape from the constant shelling and instability of the self-proclaimed republics, IDPs hoped to find shelter and be accepted by their fellow countrymen. While many surveys claim that Ukrainians generally seem to have tolerant attitudes towards IDPs, the findings of my study strongly indicate that quite often IDPs normalize stigmatization they face. This study employed qualitative research methods and relied on twenty-eight semi-structured in-depth interviews with internally displaced students – a group not often studied by researchers. Each interview explored issues relating to the identities of IDPs and their juxtaposition (Ukrainian, resettler and regional identity). Similar to other studies based on qualitative strategies, this research has its limitations, stemming from difficulties to extract opinions that would not be tainted by the desire to fit into a particular narrative or match perceived expectations. While researchers can attempt to remain unbiased and be aware of their subconscious beliefs, we cannot be certain that what interviewees share with us is what they sincerely believe. Nevertheless, taking into account these limitations, qualitative studies are essential for understanding the experiences of Ukrainian IDPs. While more research is needed to get to the roots of the issues surrounding the unique challenges of IDPs’ integration, this thesis makes a step to analyze what causes stigmatization of Ukrainian IDPs, how IDPs choose to respond to the stigma, what kind of strategies they use to manage it, how they interact with locals in the host communities and what are the consequences of such stigmatization. / Thesis / Master of Arts (MA)

京都大学 / 新制・課程博士 / 博士(法学) / 甲第24366号 / 法博第289号 / 新制||法||178(附属図書館) / 京都大学大学院法学研究科法政理論専攻 / (主査)教授 濵本 正太郎, 教授 酒井 啓亘, 教授 鈴木 基史 / 学位規則第4条第1項該当 / Doctor of Laws / Kyoto University / DFAM

This dissertation considers how refugees and internally displaced persons (IDPs) are conceived in international relations, and how they are understood in relation to the global refugee regime complex. This research explores how cognitive frames are impeding fair/democratic governance of IDPs/refugees and employs two case studies to investigate how the practice of critical reflexivity can lead to the creation of democratic spaces for refugees/IDPs to enact protection preferences. The first case analysis argues that Sarvodaya Shramadana's Deshodaya initiative in Sri Lanka has enabled IDPs in that nation to embrace critical reflexivity to re-constitute/reimagine themselves as governing agents who can redefine state and international organization-based definitions of their protection. The second case examines asylum adjudications at the Department of Homeland Security and is an exploration of how that agency's responsible officials can employ critical reflexivity to recognize seemingly hidden governance structures that condition their decision-making and limit refugee choices. Finally, this inquiry offers a new, organic model for conceptualizing both refugee/IDP governance and strategies for democratization of refugee/IDP governance institutions and systems. / Ph. D.

This project questions a core value that writing center workers have long held about tutoring writing: that we change writers. Applying sociocognitive and Bakhtinian lenses, I was able to complicate theory-practice connections. Tutor-tutee negotiations during tutorials, tutees' perceived learning outcomes, and their revisions were compared with their reasons for revising so that I could investigate what tutees potentially learn from their tutors, how, and why. Data indicated if tutors' information/advice became, in Bakhtin's terms, internally persuasive to tutees. When the authoritative discourses tutors represent or endorse converge with students' internally persuasive discourses, they converge in students' revision choices as tutor-tutee interdiscursivity. I proposed that such a convergence can lead to "changed" writers, writers who alter their understanding of themselves as writers and/or modify their thinking about a given paper, concept, or process. Even though students granted their tutors considerable authority, most tutees examined their tutors' comments to see if they made sense and were worthy of internalizing as generalized concepts to help them meet current writing goals. In short, tutors do indeed change writers, as I have defined change in the context of this study. Work with specific papers can impact students in terms of their larger process and development as writers; tutors' strategies/concepts can become writers' strategies/concepts to be applied again in new contexts. However, even when tutees were internally persuaded and appeared to have changed as writers, analyses into their tutorials, revisions, perceived learning outcomes, and reasons for revising showed that some students took up their tutors' information/advice in ways beyond their tutor's control. What some students internalize can be situation-specific and may not necessarily translate to other writing projects, can be significant yet limited understandings of rhetorical concepts, and may not appear in their revised drafts. Students can also be resistant to rhetorical concepts and revision strategies, especially those they perceive as antithetical to their ideological views about process, content, or structure. Given the variety of reasons students revise, the multiple contexts and influences affecting tutorials, and the ensuing challenges inherent in assessing tutorials, I recommend that tutors do not measure their success based on the Northian idea of a writing center. Though we do change writers, I recommend writing center workers think about successful tutorials in more complex ways than our Northian goal might imply. Tutors' successes are not dependent on changes to writers but on their ability to collaboratively negotiate with writers. Instead of trying to prove the efficacy of writing center tutorials as direct cause and effect relationship, I recommend that writing center administrators try to demonstrate how tutorials foster several habits of mind that college students need to cultivate to become successful writers.

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The aim of this study was twofold; firstly it sought to describe the human security situation of Roma IDPs and IDPs living in collective centers, secondly it tried to create an understanding for how the human security situation can affect IDPs capabilities to develop. The findings of the study were mainly based on a field study conducted in Belgrade, Serbia for two months. The results of the study were that IDPs in collective centers have a poor human security situation regarding basic income, employment, adequate housing and experienced personal security. Roma IDPs suffer from the same insecurities, but in addition also has poor human security in basic education and personal safety. Their stagnant human security situation proved to be the result of the inability to help IDPs by the actors involved in the relief work. Obstacles such as the Serbian government’s policy of return, a society in transition, the status of IDPs, lack of necessary documents together with lack of agency of IDPs and mistrust between different levels of the society, have hindered a positive improvement of IDPs human security situation. Their poor human security situation and their lack of instrumental freedoms in the Serbian society have lead to limited prospects for these two groups of IDPs to develop in the Serbian society.