VictorJuiz/thesis huggingface dataset:
Climate processes over the Himalaya – the added value from high resolution regional climate modelling
Keywords: Indian monsoon
South Asia
regional climate model
added value
Nepal
Himalaya

The Himalaya plays a vital role in shaping the hydro-climate of South Asia and beyond, but their climate has not yet been monitored and modelled as well as some other regions. As the summer monsoon is the dominant climate system over South Asia, including the Himalaya, realistic simulation of the South Asian summer monsoon (SASM) should be a prerequisite for the satisfactory simulation of the Himalayan climate. The present research tests the assumption that higher resolution modelling will provide improved representation of the SASM, both regionally and over the Himalaya region. The first part of this research assesses the strength and stability of the temporal relationships between the monsoon rainfall indices (MRIs) and the large-scale monsoon circulation indices (MCIs), as a precursor to using such indices for model evaluation. The remainder of the thesis evaluates model performance in simulating various characteristics of SASM, mainly with regard to precipitation. In particular, the sensitivity of a regional climate model (RCM) simulation to domain size and added value of high resolution RCM simulation are evaluated. For this purpose, the Hadley Centre unified model - HadGEM is utilized in its regional and, in few instances, global configurations. The RCM simulations are performed at 0.44° and 0.11° horizontal resolutions and they are forced by the ERA interim dataset. Results show that i) the MRI-MCI relationship exhibits considerable low-frequency variability, ii) RCM simulation of SASM, particularly precipitation, shows sensitivity to domain size and simulation with a moderately sized domain that partially excludes bias prone equatorial Indian ocean outperform those with larger domains, iii) high resolution RCM simulation adds value in many aspects of SASM precipitation, including the seasonal mean, relative frequency distribution, extremes, and active and break monsoon composites, but the improvements are generally seen over the Indo-Gangetic plain rather than the Himalaya. The findings promote use of a high resolution RCM over a moderate sized domain (˜ 25,000,000 sq. km) for the realistic simulation of SASM, but the study needs to be repeated with multiple realizations and different RCMs before arriving at a robust conclusion.
Essays on information disclosure in auctions and monopoly pricing
Keywords: auctions
cheap talk
monopoly pricing
information disclosure

The existing literature on information disclosure commonly assumes full commitment to truthful disclosure and therefore revelations are always credible, which can be quite unrealistic in many circumstances. This thesis mainly contributes to the literature by studying information disclosure in the form of cheap-talk in auctions and monopoly pricing, which allows for mis-reporting and false disclosure.
The thesis is composed mainly of three research papers. The first paper (Chapter 2), also the major chapter of this thesis, investigates cheap-talk information disclosure in auctions, where bidders' preferences are horizontally differentiated. The seller may reveal information of product attributes before the auction, and the disclosure policy is characterized by a partition of the attribute space. In a symmetric setting, I first show that informative equilibria reveal the feature that more precise information is provided for less popular product attributes. Second, I prove an equilibrium existence theorem that an informative equilibrium can be supported by an information partition of any degree, as long as the number of bidders is sufficiently large. And finally, the optimal disclosure policy reveals a complementarity relationship between the number of bidders and the optimal degree of equilibrium partitions. In this chapter, optimal information structure is endogenously determined.
In the second paper (Chapter 3), I turn to study how a monopoly seller should reveal a product's horizontal attributes, when consumer preferences conform to a mixture distribution. I show that the optimal disclosure policy largely depends on the characteristics of the mixture distribution. Specifically, when consumer preferences are highly heterogenous, it is better for the seller to reveal information and serve different groups of consumers separately. And when the preference distribution becomes more asymmetric, cheap-talk disclosure is more likely to be dominated by no disclosure at all. In this chapter, information structure is taken as given.
The third paper (Chapter 4) studies optimal regulation of risk-averse producers, in a setting of complementary production with independent cost realization. The production can be organized in the form of either component, or integrated production. I show in this paper that the relative virtues of these two forms of production depend on the degree of risk aversion of the producers.
Declaring war no more: the use of international legal frameworks and the expansion of the presidential war power
Keywords: presidency
war powers
Korean War
Congress
Vietnam War
Gulf War
constitution

The struggle between the President and the Congress over the power to control the use of military force is an enduring dimension of U.S. foreign policy. In the 20th century Arthur Schlesinger labeled the growth of Presidential war power the “Imperial Presidency.” While some scholars have attempted to explain the expansion of Presidential power based on the Cold War or nuclear weapons, there has been little work studying the link between America’s ascending role in international legal frameworks and this domestic legal transformation.
In this dissertation, I argue that America’s participation in international legal frameworks, such as the United Nations and NATO, has been a central factor in enabling the growth of Presidential war power. These international frameworks allow the President to circumvent Congress and to assert that the use of military force was something other than a ‘war’ that would need Congressional authorization. In case studies of pre-WWII aid to Great Britain, the Korean War, the Vietnam War and the Gulf War, I demonstrate how the rise of executive war power relied on America’s growing participation in international legal frameworks.
The dissertation contributes to the nexus of International Relations and Constitutional scholarship. It offers a unique interpretation of Presidential war power while also offering new insights on the nature of the United States’ relationship with international legal frameworks. I argue that participation in international legal frameworks has been ‘democracy-undermining’ as the President utilizes those frameworks to circumvent the Constitution’s restrictions on Presidential war power.
Towards cavity quantum electrodynamics and coherent control with single InGaN/GaN quantum dots
Keywords: quantum dots
InGaN
coherent control

Experimental investigations of the optical properties of InGaN/GaN quantum dots are presented. A pulsed laser is used to perform time-integrated and time-resolved microphotoluminescence, photoluminescence excitation, and polarisation-resolved spectroscopy of single InGaN quantum dots under a non-linear excitation regime.
The first micro-photoluminescence results from InGaN/GaN quantum dots grown on a non-polar crystal plane (11-20) are presented. Time-resolved studies reveal an order of magnitude increase in the oscillator strength of the exciton transition when compared to InGaN quantum dots grown on the polar (0001) plane, suggesting a significantly reduced internal electric field in non-polar InGaN quantum dots.
Polarisation resolved spectroscopy of non-polar InGaN quantum dots reveals 100% linearly polarised emission for many quantum dots. For quantum dot emissions with a polarisation degree less than unity, a fine structure splitting between two orthogonal polarisation axes can be resolved in an optical setup with a simple top-down excitation geometry.
A statistical investigation into the origins of spectral diffusion in polar InGaN quantum dots is presented, and spectral diffusion is attributed to charge carriers trapped at threading dislocations, and itinerant and trapped carriers in the underlying quantum well layer which forms during the growth procedure. Incorporating quantum dots into the intrinsic region of a p-i-n diode structure and applying a reverse bias is suggested as a method to reduce spectral diffusion.
Coherent control of the excited state exciton in a non-polar InGaN quantum dot is experimentally demonstrated by observation of Rabi rotation between the excited state exciton and the crystal ground state. The exciton ground state photoluminescence is used as an indirect measurement of the excited state population.
Repentance in Christian late antiquity, with special reference to Mark the Monk, Barsanuphius and John of Gaza, and John Climacus
Keywords: Barsanuphius and John of Gaza
asceticism
Mark the Monk
penance
repentance
Christian late antiquity
John Climacus

From its beginnings, Christianity has been fundamentally conditioned by the idea of repentance. However, while the institutional practice of repentance in the early Christian world has received much scholarly attention, relatively little exists which deals with the development and applications of the wider concept (of which its institutional aspect is only a part). The purpose of this dissertation is to provide both a re-assessment and a re-framing of this foundational concept of repentance in Christian late antiquity, with special reference to formative Greek monastic sources from the fifth to seventh centuries. Following a discussion of scholarship, terms, and methodology in chapter one, the question of defining repentance in the Greek patristic world is addressed in chapter two, looking first at the major sources for later approaches (the Septuagint, the New Testament, and Classical/Hellenistic texts). A significant re-appraisal of the dominant scholarly narrative of repentance in the early church will be offered in the following chapter, making way for a close study of the chosen monastic authors: Mark the Monk, Barsanuphius and John of Gaza, and John Climacus in turn. A threefold framework whereby their respective approaches to repentance can be understood in their integrity and diversity will be suggested, involving 1) initial or 'cognisant' repentance, in which the sinner recognizes his or her fallen state and turns it heavenward; 2) 'existential' repentance, which involves the living out of repentance as a way of life, governing all the Christian's actions and intentions; 3) 'Christ-like' repentance, which serves as the summit and ultimate goal of the Christian's personal repentance, whereby the loving and sacrificial 'repentance' of Christ for others and the world at large is assimilated and worked out in the Christian's own life. It will be argued that this framework provides a new and significant hermeneutical lens through which not simply the early Christian concept of repentance in itself can be better understood, but also through which the development of early Christian self-identity and self-perception, particularly in an ascetic context, can be gauged.
Neutron scattering from low-dimensional quantum magnets
Keywords: strongly correlated electron systems
transition metal oxides
neutron scattering
magnetism

Neutron scattering measurements were used to investigate the magnetic and crystal structure and magnetic excitations of three compounds characterized as low-dimensional quantum magnets. The materials are frustrated systems with low spin quantum number. The first was a powder sample of AgNiO2. The Ni ions form a triangular lattice antiferromagnet in which, according to the published crystal structure, both the orbital order and magnetic couplings are frustrated. However, it is shown here that there was a small distortion of the crystal structure at 365 K, which is proposed to result from charge disproportionation and this relieves the orbital frustration. The magnetic structure was investigated and, below 20 K, the triangular lattice of electron-rich Ni sites was observed to order into antiferromagnetic stripes. Investigations of the magnetic excitations showed that the main dispersions were within the triangular plane, indicating a strong two-dimensionality. The dispersion was larger along the stripes than between the stripes of collinear spins. The second material investigated was CoNb2O6, a quasi Ising-like ferromagnet. It was studied with a magnetic field applied transverse to the Ising direction. The magnetic field introduced quantum fluctuations which drove a phase transition at a field comparable to the main exchange interaction. The phase diagram of the magnetic order was mapped outs and a transition from an ordered phase to a paramagnetic phase was identified at high field. This low-temperature high-field phase transition was further investigated by inelastic neutron scattering measurements to observe the change in the energy gap and magnetic excitation spectrum on either side of the transition. The spectrum had two components in the ordered phase and had sharp magnon modes in the paramagnetic phase. The third material was the spin-half layered antiferromagnet CuSb2O6. It has a square lattice of Cu2+ ions in which the main interaction is across only one diagonal of the square. The magnetic structure was studied by neutron scattering with a field applied along the direction of the zero-field ordered moment. A spin-flop was observed at low field and there was evidence for a high-field transition. The magnetic excitation spectrum was unusual in that it had an intense resonance at 13 meV at the magnetic Brillouin zone boundary.
Scepticism at sea: Herman Melville and philosophical doubt
Keywords: The Piazza Tales
American literature
Mardi
scepticism
epistemology
Stanley Cavell
Herman Melville
doubt
Moby-Dick
Pierre
philosophy

This thesis explores Herman Melville’s relationship to sceptical philosophy. By reading Melville’s fictions of the 1840s and 1850s alongside the writings of Descartes, Berkeley, Hume, and Kant, I seek to show that they manifest by turns expression, rebuttal, and mitigated acceptance of philosophical doubt.
Melville was an attentive reader of philosophical texts, and he refers specifically to concepts such as Berkeleyan immaterialism and the Kantian “noumenon”. But Melville does not simply dramatise pre-existing theories; rather, in works such as Mardi, Moby-Dick, and Pierre he enacts sceptical and anti-sceptical ideas through his literary strategies, demonstrating their relevance in particular regions of human experience. In so doing he makes a substantive contribution to a philosophical discourse that has often been criticised – by commentators including Samuel Johnson and Jonathan Swift – for its tendency to abstraction.
Melville’s interest in scepticism might be read as part of a wider cultural response to a period of unprecedented social and political change in antebellum America, and with this in mind I compare and contrast his work with that of Dickinson, Douglass, Emerson, and Thoreau. But in many respects Melville’s distinctive and original treatment of scepticism sets him apart from his contemporaries, and in order to fully make sense of it one must range more widely through the canons of philosophy and literature. His exploration of the ethical consequences of doubt in The Piazza Tales, for example, can be seen to anticipate with remarkable precision the theories of twentieth-century thinkers such as Emmanuel Levinas and Stanley Cavell.
I work chronologically though selected prose from the period 1849-1857, paying close attention to the textual effects and philosophical allusions in each work. In so doing I hope to offer fresh ways of looking at Melville’s handling of literary form and the wider shape of his career. I conclude with reflections on how Melville’s normative emphasis on the acknowledgement of epistemological limitation might inform the practice of literary criticism.
Truth, deflationism and the ontology of expressions: an axiomatic study.
Keywords: axiomatic truth
bearers of truth
deflationism

Philosophical enquiry on the notion of truth has traditionally involved the identification of a class of objects to which truth is ascribed. At the same time, formal investigations are often required when the notion of truth is at issue: semantic paradoxes force in fact philosophers to shape their arguments in a precise way. Objects of truth, in formal context, are always reduced to other, more manageable objects that mimic their structural properties such as numbers or sets. This form of reduction renders the distinction between linguistic or syntactic objects, to which truth is usually applied, and their mathematical counterparts opaque, at least from the point of view of the theory of truth. In informal metatheoretic discussion, in fact, they are clearly different entities.
In this thesis we focus on an alternative way of constructing axiomatic theories of truth in which syntactic objects and mathematical objects belong to different universes. A brief introduction tries to situate the proposed theories in the context of different investigations on axiomatic truth. Chapter 2 is devoted to the discussion of historical and more theoretical motivations behind the proposed alternative. Chapter 3 will present the syntactic koinè spoken by our theories. Morphological categories of the object language and logical concepts concerning the object theory will be formalised in a recent axiomatisation of hereditarily finite sets. In Chapter 4 we finally introduce theories of truth with a built-in syntactic theory and examine some of their consequences. We briefly focus on disquotational truth, then consider compositional axioms for truth. Chapter 5 investigates a possible application of the setting just introduced: a realisation of the all-present interaction, in metamathematical practice, between informal metatheoretic claims and their (suitably chosen) coded counterparts. In the final chapter, after a brief characterisation of the key doctrines of the delflationary conception of truth, we evaluate the impact that the theories of truth studied in this work can have on the debate on the so-called conservativeness argument, which tries to match the alleged insubstantiality of the notion of truth, advocated by deflationists, with the deductive power of deflationary acceptable theories of truth.
A corporate geography of Canada: governance and networks
Keywords: corporate geography
networks
corporate governance
Canada

Understanding corporate governance from an academic, practical, legislative, and social perspective has never been more important given the increasingly internationalized and financialized global economy. The global financial crisis of 2008 and resultant recession painfully evidence what many scholars have argued throughout the last century: in market-based economies, the economic and the social spheres remain inseparable. Today, such economies rest on the backs of publicly-traded corporations and understanding how such corporations are governed is the goal of this research effort. I argue that corporate governance is not a set of characteristics to be measured, modelled, and packaged as prescriptive principles but rather it is a series of exercises in decision-making across space and time rife with idiosyncrasies. As such, I present a novel corporate governance research agenda which focuses on the two pillars of decision-making, namely the environmental contexts within which the decision-making processes are embedded and the networks of agents involved in such processes. In a globalized economic setting, both the environmental contexts and the networks of agents readily transcend multiple social, cultural, and geo-political boundaries—resultantly, the research agenda I present is one predicated on the geography of governance. I apply my research agenda to the Canadian setting in efforts to demonstrate the utility of this research agenda while providing a better understanding of the Canadian model of corporate governance. This research is the first to systematically investigate the Canadian model of corporate governance and concludes that, contrary to predominant assumptions, there is no single harmonious national model but rather a mosaic of thirteen distinct provincial and territorial models which are asymmetrically linked by means of market actors and interactions and which exists in a temporary balance of parochial and cosmopolitan forces.
Multiscale modelling of sintering in thermal barrier coatings
Keywords: multiscale modelling
thermal barrier coatings
mud-craking
sintering

Multiscale (analytical and computational) models have been developed based on a thermodynamic variational principle (TVP) to model sintering and eventual mudcracking in thermal barrier coatings (TBCs) made using the electron beam physical vapour deposition (EB-PVD) process. It is assumed that the sintering occurs by interfacial diffusion at local contacts between columns and driven by changes in interface free energy and elastic stored energy of the coating. The models link diffusional processes at the scale of contacting feathery columns with the macroscopic deformation and sintering response. In service, the columns can come into contact and sinter together. As sintering progresses there is a build up of strain energy in the system which reduces the driving force for sintering and leads to either complete or incomplete sintering of the TBC depending on the magnitude of effective modulus (E) of the coating. By seeding the coating with initial imperfections, different types of behaviour are observed depending on the value of E and the spacing between imperfections. For compliant coatings, the response is insensitive to the presence of imperfections and the coating fully sinters. At higher values of E, strain energy is released by the development of intercolumnar cracks in the coating, which can propagate to the interface with the TGO (thermally grown oxide), deflect into the interface and propagate, leading to spallation of regions of the coating and loss of thermal protection. It is observed that cracks develop at initial imperfections in the structure. The greater the spacing between imperfections the faster the development of cracks at these locations. If a TBC contains a distribution of imperfections there is progressive formation of cracks, with the average spacing decreasing with time, after an initial incubation period. The crack density eventually saturates to a constant value, which depends on the mechanical properties of the TBC.
Initially, a crack spacing, CS, in the range 1.5H ≤ CS ≤ 3H has been predicted based on trapezoidal contact models. Here H is the thickness of the coating. Crack spacing predicted using this model is consistent in the lower range of experimentally observed crack spacing. However, axisymmetric contact models predict a crack spacing, CS, in the range 4H ≤ CS ≤ 8H, which is in good agreement with experimentally observed crack spacing range 3H ≤ CS ≤ 10H reported in the literature. Compared to the trapezoidal contact models, axisymmetric contact models more accurately predict the sintering response.