VictorJuiz/thesis huggingface dataset:
Middle Cypriot White Painted Ware: A Study of Pottery Production and Distribution in Middle Bronze Age Cyprus
Keywords: ceramics
potters
distribution
production
chaine operatoire

White Painted Ware, the most identifiable of pottery types of the Middle Bronze Age on Cyprus, has been studied by scholars either with the view to creating chronological typologies or to tracing trade routes. Little attention has been paid to the technology and social organization of production of this pottery. This thesis is concerned with the potters as much as with the pottery. The production sequence is examined from clay selection through to decoration of the vessels. An attempt is made to isolate production centres with unique methods of vessel construction as well as preferences for certain shapes and decorative schemes. Using petrographic analysis, different fabrics are isolated within the ware, and these are in turn related to the groups of vessels created based on style. Similar fabrics are used in multiple sites and most sites were found to have used multiple fabrics to create pottery that is considered to be part of the White Painted ware group. Beneath the major differences in styles between sites are several minor variations in construction method and decoration that are more likely to represent choices made by individual potters or small groups of potters working together. Based on vessel shape and decoration, seven distinct production centres appear to have been manufacturing White Painted ware on Cyprus over the course of the Middle Bronze Age. These were not operating simultaneously, but appear to have been active at the time that their regions were most prosperous, linking the production and use of White Painted ware with political and economic power.
Towards a Definition of Visual Artists’ Archives: Vera Frenkel’s Archives as a Case Study
Keywords: artists' archives
archival studies
Vera Frenkel
artists' studios

This dissertation is an exploratory case study of the archives of Canadian artist Vera Frenkel and their acquisition by Queen’s University Archives in Kingston, Ontario. The research seeks to understand, through empirical investigation, the many factors that shape the artist’s recordkeeping and archives in the personal sphere and contribute to the nature of the eventual archival fonds in the institution. The foundation for the research includes the literatures of archival studies, life narrative, and art. Vera Frenkel’s interdisciplinary art work reflects a deep engagement with questions of truth and fiction. As an aspect of this theme, records and archives play a role in several of her works, often being revealed as problematic sources of evidence. Fundamental to the artist’s approach to interdisciplinarity is a complex layering of elements that builds uncertainty in the viewer. Given these aspects of Frenkel’s work, research that elicits the artist’s testimony about her archives must be able to accommodate a degree of ambiguity in the construction of that testimony. In a series of in situ interviews with the artist in her studio, the author investigated Frenkel’s recordkeeping habits and their relationship to her creative practice. As a data source, these interviews were supplemented by the artist’s photographs and hand-drawn maps of the studio. The author also investigated the processes entailed by archival transfer, examining the extant Vera Frenkel fonds at Queen’s University Archives and interviewing Heather Home, the archivist responsible for the acquisition. Both the personal and institutional spheres were taken into consideration as essential contributors to the nature of Frenkel’s archives as a complex cultural artifact. The research argues for the central role of archives in the acquisition and preservation of contemporary art. It contributes a foundation for understanding the nature of visual artists’ archives.
A Sociomusical Analysis of the Paran
Keywords: tabla
pakhavaj
paran

A paran is a composed drum piece for the North Indian pakhavaj or tabla drums, and it is also choreographed for kathak dance. Paran refers specifically to a type of pakhavaj composition whose structure and compositional attributes are greatly varied. When applied to tabla or kathak, the term refers to a piece that is either directly borrowed from, or meant to imitate, the pakhavaj. Notwithstanding, it is notoriously difficult to define a paran precisely, especially those varieties found in tabla and kathak dance. Moreover, there are many, often contradictory opinions as to what these pieces are, largely because they display attributes that overlap with other types of composition. In this dissertation I discuss previous scholarly attempts to define the paran genre, various performers’ opinions on the subject, the technical execution of these pieces on the tabla, and the social trends that have contributed to the development of parans as they are performed on tabla or in kathak dance. I also analyse several compositions that I learned on the tabla in order to gain some sense of the structural, aesthetic, and compositional attributes of these pieces.
Investigation of Two-phase Microchannel Flow and Phase Equilibria in Micro Cells for Applications to Enhanced Oil Recovery
Keywords: Liquid-liquid two-phase flow
MIcrochannel
Solubility micro-cell

The viscous oil-water hydrodynamics in a microchannel and phase equilibria of heavy oil and carbon dioxide gas have been investigated in connection with the enhanced recovery of heavy oil from petroleum reservoirs. The oil-water flow was studied in a circular microchannel made of fused silica with an I.D. of 250 µm. The viscosity of the silicone oil (863 mPa.sec) was close to that of the gas-saturated heavy oil in reservoirs. The channel was always initially filled with the oil. Two different sets of experiments were conducted: continuous oil-water flow and immiscible displacement of oil by water. For the case of continuous water and oil injection, different types of liquid-liquid flow patterns were identified and a flow pattern map was developed based on Reynolds, Capillary and Weber numbers. Also, a simple correlation for pressure drop of the two phase system was developed. In the immiscible displacement experiments, the water initially formed a core-annular flow pattern, i.e. a water core surrounded by a viscous oil film. The initially symmetric flow became asymmetric with time as the water core shifted off centre and also the waves at the oil-water interface became asymmetric. A linear stability analysis for core-annular flow was also performed. A characteristic equation which predicts the growth rate of perturbations as a function of the core radius, Reynolds number, and viscosity and density ratios of the two phases was developed. Also, two micro cells for gas solubility measurements in oils were designed and constructed. The blind cell had an internal volume of less than 2 ml and the micro glass cell had a volume less than 100 µl. By minimizing the cell volume, measurements could be made more quickly. The CO2 solubility was determined in bitumen and ashphaltene-free bitumen samples to show that ashphaltene has a negligible effect on CO2 solubility.
Effects of Histone Deacetylase Inhibitors on the Maintenance of Midbrain Neurons and Glia
Keywords: Histone deacetylase inhibitors
mammalian midbrain

Perturbations of the complex intrinsic and extrinsic factors that contribute to cellular differentiation can have many consequences ranging from dedifferentiation to cell death. The overall objective of my research is to investigate the factors that contribute to the maintenance of mature midbrain neurons and glia. In order to address this objective, I first carried out a detailed immunocytochemical analysis to demonstrate that histone deacetylase inhibitor (HDACI) treatment of differentiated midbrain neurons in culture results in an overall destabilization of neuronal phenotype, which leads to caspase-independent cell death. GFAP positive astrocytes are refractory to the effects of HDACI treatment, suggesting that inhibition of HDACs has differential effects on neurons and glia. HDACI treatment alone was not sufficient to induce neuronal dedifferentiation as evidenced by RT-PCR analysis of stem/progenitor markers, and recovery experiments. Finally, I demonstrate that cortical neurons do not undergo cell death in response to HDACI treatment, suggesting that there may be microenvironmental factors that promote the susceptibility of midbrain neurons to the neurotoxic effects of HDACI. In the second part of this thesis I determined the molecular mechanism that was at least partly responsible for the effects of HDACI treatment on midbrain neurons. Gene expression profiling of HDACI treated midbrain cultures revealed a strong down-regulation of immune related factors. This observation is supported by the loss of microglia in HDACI treated midbrain cultures. I also provide evidence that Toll-like receptor (TLR) signaling, likely through the activation of Interleukin-6 (IL-6) expression, mediates HDAC-dependent neuronal survival. These data provide new evidence that the neuroimmune system is an extrinsic regulator for the homeostasis and survival of neurons.
Combined Numerical and Thermodynamic Analysis of Drop Imbibition Into an Axisymmetric Open Capillary
Keywords: Multiphase
CFD
Surface tension
Numerical model
VoF
normals and curvature
drop imbibition
Advection
interfacial flows

This thesis presents an axisymmetric numerical model to simulate interfacial flows near a sharp corner, where contact line pinning occurs. The method has been used to analyze drop imbibition into a capillary. To evaluate the performance of the numerical method, for a liquid drop initially placed partially within a capillary, a thermodynamic model has also been developed, to predict equilibrium states. The first part of this thesis presents an axisymmetric VoF algorithm to simulate interfacial flows near a sharp corner. (1) A new method to exactly calculate the normals and curvatures of any circle with a radius as small as the grid size is presented. This method is a hybrid least squares height function technique which fits a discretized osculating circle to a curve, from which interface normals and curvature can be evaluated. (2) A novel technique for applying the contact angle boundary condition has been devised, based on the definition of an osculating circle near a solid phase. (3) A new flux volume construction technique is presented, which can be applied to any split advection scheme. Unlike the traditional approach where the flux volumes are assumed rectangular, the new flux volumes can be either trapezoidal or triangular. The new technique improves the accuracy and consistency of the advection scheme. (4) Explicit PLIC reconstruction expressions for axisymmetric coordinates have been derived. (5) Finally, a numerical treatment of VoF for contact line motion near a sharp corner is presented, base on the idea of contact line pinning and an edge contact angle. The second part of the thesis is on the imbibition of a drop into an open capillary. A thermodynamic analysis based on minimization of an interfacial surface energy function is presented to predict equilibrium configurations of drops. Based on the drop size compared to the hole size, the equilibrium contact angle, and the geometry of the capillary, the drop can be totally imbibed by the capillary, or may not wet the capillary at all. The thesis concludes with application of the numerical scheme to the same problem, to examine the dynamics of wetting or dewetting of a capillary. All of the simulations yield results that correspond to the equilibrium states predicted by the thermodynamic analysis, but offer additional insight on contact line motion and interface deformation near the capillary edge.
Software Evolution: A Requirements Engineering Perspective
Keywords: Requirements
Software
Evolution

This thesis examines the issue of software evolution from a Requirements Engineering perspective. This perspective is founded on the premise that software evolution is best managed with reference to the requirements of a given software system. In particular, I follow the Requirements Problem approach to software development: the problem of developing software can be characterized as finding a specification that satisfies user requirements, subject to domain constraints. To enable this, I propose a shift from treating requirements as artifacts to treating requirements as design knowledge, embedded in knowledge bases. Most requirements today, when they exist in tangible form at all, are static objects. Such artifacts are quickly out of date and difficult to update. Instead, I propose that requirements be maintained in a knowledge base which supports knowledge-level operations for asserting new knowledge and updating existing knowledge. Consistency checks and entailment of new specifications is done automatically by answering simple queries. Maintaining a requirements knowledge base in parallel with running code means that changes precipitated by evolution are always addressed relative to the ultimate purpose of the system. This thesis begins with empirical studies which establish the nature of the requirements evolution problem. I use an extended case study of payment cards to motivate the following discussion. I begin at an abstract level, by introducing a requirements engineering knowledge base (REKB) using a functional specification. Since it is functional, the specifics of the implementation are left open. I then describe one implementation, using a reason-maintenance system, and show how this implementation can a) solve static requirements problems; b) help stakeholders bring requirements and implementation following a change in the requirements problem; c) propose paraconsistent reasoning to support inconsistency tolerance in the REKB. The end result of my work on the REKB is a tool and approach which can guide software developers and software maintainers in design and decision-making in the context of software evolution.
A Radio Frequency Quadrupole Instrument for use with Accelerator Mass Spectrometry: Application to Low Kinetic Energy Reactive Isobar Suppression and Gas–phase Anion Reaction Studies
Keywords: radio frequency quadrupole
rf quadrupole
accelerator mass spectrometry
AMS
gas-phase reactions
isobar suppression
anion
negative ion
chlorine
Cl
36Cl
carbon trimer
C3
sulphur
sulfur
sulphur oxide
sulfur oxide
SO
methane
CH4
nitrogen dioxide
NO2
nitrous oxide
N2O
oxygen
O2
argon
Ar
strontium
Sr
90Sr
SrF3
yttrium
Y
zirconium
Zr
ZrF3
trace isotope analysis
superhalogen anion
secondary ion mass spectrometry
SIMS
Cs sputter ion source
rf quadrupole ion trajectory simulation
anion gas reactions
negative ion gas reactions
gas-phase anion reactions
S- + NO2
SO- + NO2
S- + N2O
S- + O2
S- + Ar
Cl- + NO2
Cl- + Ar
Cl- + CH4
SrF3- + NO2
YF3- + NO2
ZrF3- + NO2
C3- + NO2

A radio frequency (rf) quadrupole instrument, currently known as an Isobar Separator for Anions (ISA), has been integrated into an Accelerator Mass Spectrometry (AMS) system to facilitate anion–gas reactions before the tandem accelerator. An AMS Cs+ sputter source provided > 15 keV ions that were decelerated in the prototype ISA to < 20 eV for reaction in a single collision cell and re-accelerated for AMS analysis. Reaction based isobar suppression capabilities were assessed for smaller AMS systems and a new technique for gas–phase reaction studies was developed. Isobar suppression of 36S– and 12C3– for 36Cl analysis, and YF3– and ZrF3– for 90Sr analysis were studied in NO2 with deceleration to < 12 eV. Observed attenuation cross sections, σ [x 10^–15 cm^2], were σ(S– + NO2) = 6.6, σ(C3– + NO2) = 4.2, σ(YF3– + NO2) = 7.6, σ(ZrF3– + NO2) = 19. With 8 mTorr NO2, relative attenuations of S–/Cl– ~ 10^–6, C3–/Cl– ~ 10^–7, YF3–/SrF3– ~ 5 x 10^–5 and ZrF3–/SrF3– ~ 4 x 10^–6 were observed with Cl– ~ 30% and SrF3– > 90% transmission. Current isobar attenuation limits with < 1.75 MV accelerator terminal voltage and ppm impurity levels were calculated to be 36S–/Cl– ~ 4 x 10^–16, 12C3–/Cl– ~ 1.2 x 10^–16, 90YF3–/SrF3– ~ 10^–15 and 90ZrF3–/SrF3– ~ 10^–16. Using 1.75 MV, four 36Cl reference standards in the range 4 x 10^–13 < 36Cl/Cl < 4 x 10^–11 were analyzed with 8 mTorr NO2. The measured 36Cl/Cl ratios plotted very well against the accepted values. A sample impurity content S/Cl < 6 x 10^–5 was measured and a background level of 36S–/Cl < 9 x 10^–15 was determined. Useful currents of a wide variety of anions are produced in AMS sputter sources and molecules can be identified relatively unambiguously by stripping fragments from tandem accelerators. Reactions involving YF3–, ZrF3–, S– and SO– + NO2 in the ISA analyzed by AMS are described, and some interesting reactants are identified.
Teaching English as a Foreign Languate and Using English as a Medium of Instruction in Egypt: Teachers’ Perceptions of Teaching Approaches and Sources of Change
Keywords: teacher education
professional development
EFL teaching
Egypt
teaching approaches
sources of change
instructional change
private education sector
public education sector

With the internationalization of English there is a growing demand for high quality English language education around the globe, particularly in non-English speaking countries. Consequently, there is an increasing demand worldwide for competent English teachers and more effective approaches to teaching and teacher professional development. In Egypt, in a context of educational reform where communicative language teaching approaches have been adopted as a way to improve teaching, this study explores how teachers perceive and respond to this call for change in instructional practices. It examines the professional development experiences of a group of English as a foreign language (EFL) and English-medium subject (EMS) teachers working in the private and public basic educational sectors in Cairo, Egypt. The research questions focus on teachers’ perceptions of change and improvement occurring in their teaching practices, their beliefs on the sources of change available to them, and the perspectives of school principals and professional development providers on teachers’ change prospects. In this study, a multi-method approach was applied, with a teacher survey administered to 174 teachers; in-depth, semi-structured interviews with 36 teachers, 15 principals, and 8 professional development (PD) providers; field observation; and examination of relevant documents and artifacts. The analysis of data is informed by sociocultural theory perspectives (Vygotsky, 1978). The findings indicate that (1) teachers perceive great change in their practices, though their conceptions and implementation of communicative approaches are context-bound, (2) teaching is influenced by various professional learning opportunities, and (3) change or lack thereof results from teachers’ adaptability to their local contextual demands through a process of resistance, resilience, or maintaining the status quo. The findings highlight the centrality of teachers in change processes.They suggest that change results from a process of interaction between teachers and other individuals within their community, and that the nature of change as experienced by the participants is shaped by a multitude of contextual factors. The implications of the study include the need to replace the technical conception of professional development with a more ecological orientation, to establish professional learning communities among teachers and within schools, and to establish a coherent framework for change initiatives.
Making Trade-offs among Security and Other Requirements during System Design
Keywords: Security
Trade-off
Requirements
Software Design

Employing a design solution can satisfy some requirements while having negative side-effects on some other software requirements and project objectives. Ultimately, selecting a design solution among multiple options involves making trade-offs among competing requirements. These trade-offs, especially at the early stages of software development, are often hard to identify or quantify, and can be subjective. Security is one critical requirement among many, which can cause critical trade-offs and severe costs. Damages from security attacks can be overwhelming and the costs increase every year. The threat of vulnerabilities and their exploitation by potential adversaries calls for careful analysis of security risks and trade-offs that security solutions impose, from the viewpoints of both defenders and attackers. Since software developers and analysts are usually not security experts, detecting potential threats within software systems can be problematic. Even when threats are known, the risk factors, either the probability of a successful attack or the resulting damage of a successful attack, are not always known or numerically measurable. In this situation, selecting proper security solutions can be challenging, when mitigating impacts and side-effects of solutions are often not quantifiable. This thesis addresses such challenges in identifying and making trade-offs among security and other system requirements and stakeholders' goals. This work introduces a framework for identifying and modeling security risks and requirements trade-offs. The central idea in this thesis is analyzing security requirements on the basis of predicting software vulnerabilities, weaknesses or flaws that can be exploited to break into the system. Vulnerabilities and exploitation scenarios are specified within goal-oriented requirements models of the system. This approach enables analysis of vulnerability exploitations and their impacts on the running system. The structure of goal-oriented security requirements models enables tracing the ultimate impacts of the exploitations on high-level goals of stakeholders and design objectives. In order to evaluate the risk of vulnerabilities, this framework intertwines the Common Vulnerability Scoring System (CVSS) with security requirements risk assessment. The proposed framework provides a decision aid method that takes into the account risks, competing requirements, security solutions, their impacts on risks, and their side-effects on other requirements, to aid decision makers to select a solution among alternative security solutions. The proposed decision analysis method helps analysts to make requirements trade-offs systematically, in the absence of quantitative data, or when a mixture of both quantitative and qualitative data are available.