VictorJuiz/thesis huggingface dataset:
Design, Analysis, Hybrid Testing and Orientation Control of a Floating Platform with Counter-Rotating Vertical-Axis Wind Turbines

The design and operation of two counter-rotating vertical-axis wind turbines on a floating, semi-submersible platform is studied. The technology, called the Multiple Integrated and Synchronized Turbines (MIST) platform has the potential to reduce the cost of offshore wind energy per unit of installed capacity. Attached to the platform are closely-spaced, counter-rotating turbines, which can achieve a higher power density per planform area because of synergistic interaction effects. The purpose of the research is to control the orientation of the platform and rotational speeds of the turbines by modifying the energy absorbed by each of the generators of the turbines./nTo analyze the various aspects of the platform and wind turbines, the analysis is drawn from the fields of hydrodynamics, electromagnetics, aerodynamics and control theory. To study the hydrodynamics of the floating platform in incident monochromatic waves, potential theory is utilized, taking into account the slow-drift yaw motion of the platform. Steady, second-order moments that are spatially dependent (i.e., dependent on the platform's yaw orientation relative to the incident waves) are given special attention since there are no natural restoring yaw moment. The aerodynamics of the counter-rotating turbines are studied in collaboration with researchers at the UC Berkeley Mathematics Department using a high-order, implicit, large-eddy simulation. An element flipping technique is utilized to extend the method to a domain with counter-rotating turbines and the effects from the closely-spaced turbines is compared with existing experimental data./n/nHybrid testing techniques on a model platform are utilized to prove the controllability of the platform in lieu of a wind-wave tank. A 1:82 model-scale floating platform is fabricated and tested at the UC Berkeley Physical-Model Testing Facility. The vertical-axis wind turbines are simulated by spinning, controllable actuators that can be updated in real-time of the model scale. Under certain wind and wave headings, it is possible to control the orientation of the platform in regular waves to maximize the power output from the turbines. A time-domain numerical simulation tool is able to confirm some of the experimental findings, taking into account the decoupled properties of the slow-drift hydrodynamics and wind turbine aerodynamics. Future platform designs are discussed, including the French-based, pre-commercial design from Nenuphar Wind, called the TwinFloat, which is closely related to concepts examined in the thesis.

Advisor: Yeung, Ronald W
Inverse problems with rough data

In this dissertation, we will discuss some inverse problems associated to elliptic equations with rough coefficients./nThe first results in this thesis are based on the papers of Haberman-Tataru [2013] and Haberman [2014]}, and relate to Calder\'on's problem for the conductivity equation/n÷
(
γ
∇
u
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=
0./nGiven a domain $\Omega$ and a positive real-valued function $\gamma$ defined on $\Omega$, we may define the Dirichlet-to-Neumann map $\Lamba_\gamma$, which maps the Dirichlet data of solutions to the conductivity equation to the corresponding Neumann data. Calder\'on's problem is to determine $\gamma$ from $\Lambda_\gamma$. Uniqueness in Calder\'on's problem for smooth conductivities in dimensions three and higher was established by Sylvester and Uhlmann. Later, this result was extended by various authors to less regular conductivities which have at least one and a half derivatives. In Chapter 4, we will show that $\Lambda_\gamma$ uniquely determines a $C^1$ conductivity in dimensions three and higher. In Chapter 6, we will improve this result in dimensions $n=3,4$ to $\gamma \in W^{1,n}(\Omega)$. We also have a new result for conductivities in $W^{s,p}(\Omega)$ in higher dimensions for certain $(s,p)$ such that $s > 1$ but $W^{s,p}(\Omega) \not\subset W^{1,\infty}(\Omega)$./nIn Chapter 7, we will prove a new result on recovering an unbounded magnetic potential $A$ from the Dirichlet-to-Neumann map $\Lambda_{A,q}$ for the Schr\"odinger equation/n(
D
+
A
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2
u
+
q
u
=
0./nPrevious results on this problem assumed that the potential $A$ is bounded. We will show that, in three dimensions, the integrability assumption on $A$ can be considerably relaxed in exchange for slightly more regularity. Namely, we will show that the Cauchy data uniquely determine $curl A$ if $q\in W^{-1,3}(\Omega)$ and $A$ is small in $W^{s,3}(\Omega)$, where $s>0$. We will also show that $q$ is determined by the Dirichlet-to-Neumann map if $A$ is small in $W^{s,3}(\Omega)$ and $q \in L^\infty(\Omega)$.

Advisor: Tataru, Daniel I
Dwelling in my Voice: Tradition as musical judgment and aesthetic sense in North Indian classical Dhrupad

In this dissertation, I examine notions of tradition and fidelity to tradition in Indian classical music by investigating the development of musical judgment, categorical knowledge and aesthetic sense in the performance of Dhrupad - a genre of Hindustani music with medieval origins. Focusing on two contemporary performers of Dhrupad with very different histories of listening and practice, I show that categorical knowledge and strong notions of fidelity to tradition arise directly from the deeply dialogic and inter-subjective processes through which individual musicians develop and stabilize coherent aesthetic response to handed-down musical materials in situated practice. Specifically, I argue that strong notions of tradition and fidelity to tradition in Indian classical music are irreducible to a discussion of the disciplinary technologies of colonialism and cultural nationalism. Rather, I propose that tradition in Indian classical music has to be understood in dialogic relationship with intelligibility and individual musical judgment./nI develop an analytical framework to investigate the interactive basis of musical judgment and categorical sense in Dhrupad performance. I understand forms of knowledge produced in performance to be acoustemic: epistemologies produced through active sensing in and through sound. I investigate how formal structures of knowledge in a classical music system become available as human sensibility, affect and soma-aesthetic knowledge in the interactivity of musical environments - an intertwining engendered in part by the affordance of musico-aesthetic forms in Indian classical music. I show that musical objects develop both heterogeneity and ontological weight in the interactivity of Dhrupad vocal performance, rendering performance practice within traditional lineages systematic and heterogeneous, coherent and diverse. Based on this analysis I argue that heterogeneity and diversity are not antithetical to the existence of a Great Tradition of Indian classical music but a part of its sonic logic as a domain of creative human activity. In positing that the categories, codes, classifications and ontologies of the most hoary of genres in Indian classical music are constitutive of and constituted by the situated practice of classical music in particular communities, this dissertation stakes a claim to the intellectual history of traditions in postcolonial contexts.

Advisor: Wade, Bonnie C
Robust Optimization and Data Approximation in Machine Learning

Modern learning problems in nature language processing, computer vision, computational biology, etc. often involve large-scale datasets with millions of samples and/or millions of features, thus are challenging to solve. Simply replacing the original data with a simpler approximation such as a sparse matrix or a low-rank matrix does allow a dramatic reduction in the computational effort required to solve the problem, however some information of the original data will be lost during the approximation process. In some cases, the solution obtained by directly solving the learning problem with approximated data might be infeasible for the original problem or might have undesired properties. In this thesis, we present a new approach that utilizes data approximation techniques and takes into account, via robust optimization the error made during the approximation process in order to obtain learning algorithms that could solve large-scale learning problems efficiently while preserving the learning quality./nIn the first part of this thesis, we give a brief review of robust optimization and its appearance in machine learning literature. In the second part of this thesis, we examine two data approximation techniques, namely data thresholding and low-rank approximation, and then discuss their connection to robust optimization.

Advisor: El Ghaoui, Laurent
The construction of the Colombian territory: Images of the Colombian Armed Conflict 2002- 2010

My dissertation, The construction of the Colombian territory: Images of the Colombian Armed Conflict 2002-2010, critically analyzes the Colombian internal conflict and its relationship with the narrative of the nation in a global theater of operations of war in its different forms of visualization. Through a detail textual analysis of documentaries, films, recorded military operations, media military operations, and proof of life videos, I examine the effect moving images have had as part of configuring the battlefield. My research proceeds from the premise that there is a visual culture of warfare - grammars, imaginaries, and technologies – that has organized the global space of security and has brought new forms of territory that paradoxically exceed the idea of the sovereign nation and at the same time confirm it. In other words, I examine the creation and exercise of national security in a globalized world and its effects on the concept of the nation and national territory through the concept of politics of the visual. Colombia is considered a successful example for nation building, counterinsurgency tactics and U.S. intervention. As my case of study, I analyze the epistemological assumptions that emerge in the global war on terror, specifically how they reflect in the construction of the idea of Colombia as a unified image, one sovereign nation, and one territory through the production of different visual narratives.

Advisor: Esmeir, Samera
Bates, David
Structural Reform Litigation in American Police Departments

In 1994, Congress passed 42 U.S.C. §14141, a statute authorizing the United States Attorney General to seek equitable relief against local and state police agencies that are engaged in a pattern or practice of unconstitutional misconduct. Although police departments in some of the nation's largest cities have now undergone this sort of structural reform litigation, there has been little empirical research on the topic. Drawing on original interviews, court documents, statistical data, and media reports, this dissertation describes the federal government's use of structural reform litigation in American police departments and theorizes on its effectiveness. It shows that, under the right circumstances, structural reform litigation is uniquely effective at combating misconduct in police departments. It forces local municipalities to prioritize investments into police misconduct regulations. It utilizes external monitoring to ensure that frontline officers substantively comply with top-down mandates. And it provides police executives with legal cover to implement wide-ranging reforms aimed at curbing misconduct. Although expensive, structural reform litigation may ultimately pay for itself through reducing a police department's civil liability./nBut structural reform litigation is far from a perfect regulatory mechanism. Successful organizational reform requires continual support from municipal leaders, dedication by executives within the targeted agency, and buy-in by frontline officers. This suggests that structural reform litigation alone is insufficient to transform a law enforcement agency. The financial burden of structural reform litigation falls on local police agencies over a relatively short period of time. Additional questions remain about whether targeted agencies will sustain reforms after federal intervention ends and about whether this type of federal intervention makes officers less aggressive. This dissertation concludes by showing how the lessons from structural reform litigation can inform future regulations of law enforcement.

Advisor: Zimring, Franklin E
Pixel Whipped: Pain, Pleasure, and Media

At a time when technology seems increasingly poised to render the material realities of its users obsolete, putting the body back into digital media has become a matter of pressing social significance. Scholars like Lisa Nakamura have written compellingly about the importance of attending to the embodied identities of those who sit behind the screen: a crucial step toward disrupting the systems of inequality that characterize much of twenty-first-century Western digital culture. Similarly dedicated to issues of social justice, this project argues for turning attention to another essential element of the relationship between technology and the body: how digital media makes users feel. Far from being disembodied, digital tools have become crucial platforms for expressions of selfhood and desire. Yet, on a phenomenological level, virtual experiences also have a surprising capacity to directly affect the real, physical body. To demonstrate this, this project maps a network of key examples that illustrate how pain and pleasure—commonly imagined as the most embodied sensations—have in fact been brought to life through a range of media forms./nBeginning with the novels of the Marquis de Sade, Leopold von Sacher-Masoch, and Pauline Réage, this project contends that concepts of sadomasochism and literature have evolved side by side for more than two centuries. Moving from textual to visual forms, the project turns to Pier Pasolini’s Salò, a film that notoriously “hurts to watch,” to investigate the intersection of violence, complicity, and viewership. Next, the project moves into the digital realm, offering a reading of the erotic power exchange that drives video-game interactivity. In the final chapter, the project explores digital BDSM: practices of bondage, discipline, sadism, and masochism that take place entirely in virtual spaces. Across these chapters, the project argues for the value of “kink” as a critical lens, much like the “queerness” in queer studies, which underscores the cultural and personal significance of experiences that hurt. Together, the works and cultures considered here bring much-needed attention to the place of non-normative desires in media, both digital and non-digital. They also serve to productively challenge the perceived divide between the “virtual” and the “real.”

Advisor: Lucey, Michael
Matter Redeemed: Alchemy and Exegesis from Antioch to Constantinople, 11th century

This dissertation examines how scholars in eleventh-century Constantinople and Antioch (under Byzantine rule, 969-1084) understood matter and its transformation. It argues that matter, a concept inherited from ancient philosophy, continued to be a fertile and malleable idea-complex endowed with cultural and religious meaning in medieval thought-worlds of the Eastern Mediterranean./nThe first three chapters form a case study on the unpublished Arabic translations of late antique Christian texts by the 11th-century Byzantine Orthodox deacon ʿAbdallāh ibn al-Faḍl of Antioch (fl. ca. 1052). They proceed by increasing specificity: chapter 1 surveys Ibn al-Faḍl's Greek-to-Arabic translations; chapter 2 turns to one of these translations, of a famous and highly influential commentary on the first chapter of the Book of Genesis by Basil of Caesarea (ca. 330--?379), his Homilies on the Hexaemeron; and chapter 3 reads Ibn al-Faḍl's marginalia to his translation of Basil's Hexaemeron. Together, they provide insight into a culturally Byzantine milieu in which the primary language of communication was Arabic, exploring how intellectuals in that context understood matter, where this understanding came from, and why it resonated in this city at the edge of the empire./nA second case study, on Byzantine alchemy, is the subject of chapter 4, which focuses on the earliest extant Greek alchemical manuscript (10th/11th century). It argues that this manuscript can be a rich source not only for ancient alchemy but also for its Byzantine reception and appreciation. Just as translation reshapes and repackages an ancient work for new contexts, so too this manuscript's transmission and compilation sheds light on how alchemical texts ranging in date from late antiquity (and perhaps earlier) to the ninth century (and perhaps later) were read, understood, and repurposed in the middle Byzantine period in the empire's capital.

Advisor: Mavroudi, Maria
The European Union and the Constitutionalization of Democracy

From the Treaty on European Union (1992) to the Treaty of Lisbon (2007), democracy became a central element in the constitutionalization of the European Union. Over these twenty-five years, democracy was embedded in the institutions and practices of the European Union in two primary respects. First, following the controversial the ratification of the TEU, a series of treaty reforms were introduced to address the EU’s “democratic deficit.” These reforms culminated in the Lisbon Treaty. Second, in response to the political revolutions in Central and Eastern Europe the European Union made the transfer of democratic forms of rule to non-member states a key component of its membership policy. It is now the case that only democratic countries can be members in the democratic Union. This dissertation investigates the origins of some of the key ideas that led to these transformations.

Advisor: Bevir, Mark M
The Perils of Home: Race, Gender, and Labor on the Pacific Frontier

In the early twentieth century, Chinese men and white women often worked in close proximity to each other in various intimate settings in the North American West— from the kitchens of upper class homes to the noisy cafés of the city. However, little has been said in the scholarship on the social and political significance of these encounters. Instead, this study centers on the different and connected ways in which intimacy shaped the North American West in the early twentieth century. As such, this work makes central and transparent the connections between the expansion of white women’s political and economic rights and efforts to exclude the Chinese in British Columbia and California. Thus, this study asks: How were changes in the status of white women and shifting notions of domesticity related to debates about Chinese labor and migration? Conversely, to what extent was the anti-Oriental movement and its calls for exclusionary measures informed and shaped by debates about gender roles? Last, how might a transnational analysis of these intersecting debates deepen our understanding of how such controversies shaped Vancouver and San Francisco as frontiers and gateways for Chinese labor migration and white settlement? If both Western Canada and the United States were primary sites for Asian labor migration and white settlement, did intimacy and affective labor play out differently in these two contexts?/nBy using primary source documents to analyze two murder cases involving Chinese servants and two legislative efforts regarding affective labor in the distinct but connected contexts of Western Canada and the United States, this study shows how white women and Chinese men working together in intimate settings became increasingly scrutinized and subject to rampant social commentary and governmental intervention as racial, sexual, and class tensions flared.

Advisor: Omi, Michael
Negative Capacitance for Ultra-low Power Computing

Owing to the fundamental physics of the Boltzmann distribution, the ever-increasing power dissipation in nanoscale transistors threatens an end to the almost-four-decade-old cadence of continued performance improvement in complementary metal-oxide-semiconductor (CMOS) technology. It is now agreed that the introduction of new physics into the operation of field-effect transistors--in other words, ``reinventing the transistor''-- is required to avert such a bottleneck. In this dissertation, we present the experimental demonstration of a novel physical phenomenon, called the negative capacitance effect in ferroelectric oxides, which could dramatically reduce power dissipation in nanoscale transistors. It was theoretically proposed in 2008 that by introducing a ferroelectric negative capacitance material into the gate oxide of a metal-oxide-semiconductor field-effect transistor (MOSFET), the subthreshold slope could be reduced below the fundamental Boltzmann limit of 60 mV/dec, which, in turn, could arbitrarily lower the power supply voltage and the power dissipation. The research presented in this dissertation establishes the theoretical concept of ferroelectric negative capacitance as an experimentally verified fact. \/nThe main results presented in this dissertation are threefold. To start, we present the first direct measurement of negative capacitance in isolated, single crystalline, epitaxially grown thin film capacitors of ferroelectric Pb(Zr$_{0.2}$Ti$_{0.8}$)O$_3$. By constructing a simple resistor-ferroelectric capacitor series circuit, we show that, during ferroelectric switching, the ferroelectric voltage decreases, while the stored charge in it increases, which directly shows a negative slope in the charge-voltage characteristics of a ferroelectric capacitor. Such a situation is completely opposite to what would be observed in a regular resistor-positive capacitor series circuit. This measurement could serve as a canonical test for negative capacitance in any novel material system. Secondly, in epitaxially grown ferroelectric Pb(Zr$_{0.2}$Ti$_{0.8}$)O$_3$-dielectric SrTiO$_3$ heterostructure capacitors, we show that negative capacitance effect from the ferroelectric Pb(Zr$_{0.2}$Ti$_{0.8}$)O$_3$ layer could result in an enhancement of the capacitance of bilayer heterostructure over that of the constituent dielectric SrTiO$_3$ layer. This observation apparently violates the fundamental law of circuit theory which states that the equivalent capacitance of two capacitors connected in series is smaller than that of each of the constituent capacitors. Finally, we present a design framework for negative capacitance field-effect-transistors and project performance for such devices.

Advisor: Salahuddin, Sayeef