title: What Are Residents Paying Attention To? An Exploration of Mind Wandering During Classroom-Based Teaching Sessions (Academic Half-Days) in Postgraduate Medical Education

contributor:
Dore, Kelly
Health Science Education

subject:
academic half-days
mind wandering
attention
classroom learning
postgraduate medical education
resident training

abstract: INTRODUCTION: Academic half-days (AHDs) are regular teaching events that occur outside of patient care. AHDs often take the form of extended didactic lectures, despite the literature around effective teaching techniques. This may decrease residents’ ability to pay attention to the content being presented and instead promote mind wandering (defined in this thesis as self-reported task-unrelated thought). This thesis examines mind wandering during academic half-days (AHDs) in postgraduate medical training through two studies, with the overarching goal of understanding how results might inform the design of classroom-based teaching sessions in postgraduate medical education. METHODS: In the first study, a qualitative approach was used to examine residents’ perceptions about the nature of their learning experience during AHDs. Two focus groups were held with residents in hematology (n = 5) and obstetrics and gynecology (n = 15) and analyzed using a thematic analysis approach. In the second study, thought probes were administered approximately every 15 minutes during three AHD sessions in each program (hematology: n = 6 residents; obstetrics and gynecology: n = 30 residents) to quantitatively examine how three commonly-used instructional methods (didactic lecture, group discussion, and case-based learning) influenced mind wandering during AHDs. RESULTS: Findings of the qualitative study revealed differences with respect to residents’ overall perceptions of AHDs, perceptions of attention during AHDs, and motivations for learning. However, residents in both programs agreed that presenters could maximize resident engagement and learning by spending more time on case-based learning and group discussions as opposed to didactic lectures. Quantitative findings supported resident perceptions, demonstrating significantly less mind wandering during case-based learning (7%) than didactic lectures (33%). CONCLUSIONS: The findings of this work suggest that instructional method influences the amount of self-reported mind wandering during AHDs, and specifically, that case-based learning may be more effective than didactic lectures in maintaining engagement during AHDs.

abstract: Thesis

abstract: Master of Science (MSc)

abstract: Academic half-days (AHDs) are regular teaching events that occur outside of patient care. AHDs often take the form of extended didactic lectures, despite the literature around effective teaching techniques. This may decrease residents’ ability to pay attention to the content being presented and instead promote mind wandering (defined in this thesis as self-reported task-unrelated thought). This thesis examines mind wandering during AHDs, with the goal of understanding how results might inform the design of classroom-based teaching sessions in postgraduate medical education through two studies: a qualitative study examining residents’ perceptions about their learning experience during AHDs, and a quantitative study examining how three commonly-used instructional methods (didactic lecture, group discussion, and case-based learning) influenced mind wandering during AHDs. Taken together, these two studies make a contribution to the exploration of how classroom-based teaching sessions such as AHDs can be optimized to enhance student learning in postgraduate medical education.


title: The Human Right to Water: Duties and Rights Fulfillment Strategies

contributor:
Igneski, Violetta
Adeel, Zafar
Philosophy

subject: Human Rights; Moral Right; Basic Right; Safe Drinking Water; Duties; Millennium Development Goals; Sustainable Development Goals; Water Pricing;

abstract: In this thesis I argue that access to an adequate quantity and quality of safe water in sustainable ways is a basic moral human right, one that has been legally recognized by the international community through UN Resolution 15/9. As a result of water’s being a basic moral human right, governments, institutions, and individuals are obligated to avoid depriving, protect from deprivation, and aid those deprived of access to safe drinking water. Using this as a foundation, I examine the Millennium Development Goals, the Sustainable Development Goals, and water pricing as strategies used to fulfill the right to safe drinking water. I also provide arguments in favour of (national and international) tax schemes that cover the cost of providing 50L of safe water per person per day.

abstract: Thesis

abstract: Master of Arts (MA)


contributor:
Fenwick, I
Bunting, B.T.
Geography

abstract: Title: Methods of Analysing Original Vegetation Cover Using Early Land Survey Records, Author: Dollette Pile, Location: Thode

abstract: An investigation into possible methods of obtaining the maximum amount of information pertaining to the primaeval forest cover of a township in Southern Ontario.

abstract: Thesis

abstract: Master of Arts (MA)


contributor:
Kardos, G.
Mechanical Engineering

abstract: Title: A Basic System for Computerized Drafting of Power Train Shafts, Author: John K. Newlin, Location: Thode

abstract:
A set of parameters is described by which a designer can easily
express a shaft to a computer numerically. Relationships of these parameters to different shaft geometries are described. Logic is
provided for translation from the designer's parameters into parameters
convenient for manipulation by the computer and for detecting
inconsistencies in the designer's description of a shaft.

Details are given of logic by which a computer can plan locations
for shaft dimensioning, along with logic for the drawing and
dimensioning of shafts by a digital plotter.

The full listing is given in FORTRAN for a computer program
and ten subprograms embodying the logic. Shafts drawn by the
computer appear, and the economic feasibility of computer drafting
of shafts is discussed.

abstract: Thesis

abstract: Master of Engineering (ME)


title: Bias Estimation and Sensor Registration for Target Tracking

contributor:
Kirubarajan, Thia
Computational Engineering and Science

subject: bias estimation, tracking, fusion

abstract:
The main idea of this thesis is to de ne and formulate the role of bias estimation
in multitarget{multisensor scenarios as a general framework for various measurement
types. After a brief introduction of the work that has been done in this thesis, three
main contributions are explained in detail, which exercise the novel ideas.
Starting with radar measurements, a new bias estimation method that can estimate
o set and scaling biases in large network of radars is proposed. Further,
Cram er{Rao Lower Bound is calculated for the bias estimation algorithm to show
the theoretical accuracy that can be achieved by the proposed method. In practice,
communication loss is also part of the distributed systems, which sometimes can not
be avoided. A novel technique is also developed to accompany the proposed bias
estimation method in this thesis to compensate for communication loss at di erent
rates by the use of tracklets.
Next, bearing{only measurements are considered. Biases in this type of measurement
can be di cult to tackle because the measurement noise and systematic biases
are normally larger than in radar measurements. In addition, target observability
is sensitive to sensor{target alignment and can vary over time. In a multitarget{
multisensor bearing{only scenario with biases, a new model is proposed for the biases
that is decoupled form the bearing{only measurements. These decoupled bias measurements
then are used in a maximum likelihood batch estimator to estimate the
biases and then be used for compensation.
The thesis is then expanded by applying bias estimation algorithms into video
sensor measurements. Video sensor measurements are increasingly implemented in
distributed systems because of their economical bene ts. However, geo{location and
geo{registration of the targets must be considered in such systems. In last part of
the thesis, a new approach proposed for modeling and estimation of biases in a two
video sensor platform which can be used as a standalone algorithm. The proposed
algorithm can estimate the gimbal elevation and azimuth biases e ectively.
It is worth noting that in all parts of the thesis, simulation results of various
scenarios with di erent parameter settings are presented to support the ideas, the
accuracy, mathematical modelings and proposed algorithms. These results show that
the bias estimation methods that have been conducted in this thesis are viable and
can handle larger biases and measurement errors than previously proposed methods.
Finally, the thesis conclude with suggestions for future research in three main
directions.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Ion Impact Chemistry in the System Ti-O

contributor:
Kelly, Roger
Metallurgy and Materials Science

abstract: Title: Ion Impact Chemistry in the System Ti-O, Author: Thomas E. Parker, Location: Thode

abstract:
This thesis considers the characterization of the phenomenon of the induced conductivity changes in TiO2 under the influence of krypton and oxygen ion bombardment and the damage layer associated with these changes. The investigation included the examination of the irradiated and irradiated specimens (variously-single crystals and polycrystals), using electron microscopy techniques to reveal surface structural alterations; electrical conductivity measurements to assess the response to irradiation; dissolution experiments of the bombarded region to estimate the thickness and radioactive inert gas marker release to monitor the annealing stages of the damage.

 The results included the observation of lower oxide formation under ion impact and its identification as Ti2O3 and suggest a technique for producing lower oxides of transition metal oxides that have a semiconductor to metal transition of technological interest.

abstract: Thesis

abstract: Master of Engineering (ME)


title: EXPLORING THE ROLE OF DIR1 AND OTHER PHLOEM-MOBILE PROTEINS DURING SAR

contributor:
Cameron, Robin K.
Weretilnyk, Elizabeth A.
Daniel, Juliet
Biology

subject:
Plant Pathology
Phloem
Lipid Transfer Protein
Systemic Acquired Resistance

abstract:
Systemic acquired resistance (SAR) is a defense response induced by an initial
localized infection that leads to the generation of long-distance immune signals that
travel to distant leaves to provide enhanced resistance to subsequent infections. The
lipid transfer protein (LTP) DEFECTIVE IN INDUCED RESISTANCE1 (DIR1) travels
via the phloem from induced to distant leaves during SAR and may chaperone
several long-distance signal candidates. In this thesis, the role of DIR1 during SAR is
explored by examining the route of DIR1 movement, investigating the conservation
of DIR1 structure and function, and by identifying DIR1-interacting proteins. I
demonstrate that Arabidopsis plant lines with restricted cell-to-cell movement through
plasmodesmata are negatively impacted in long-distance DIR1 movement,
suggesting that cell-to-cell movement is important for DIR1 to access distant leaves.
To elucidate the molecular function of DIR1, orthology analysis was performed with
putative DIR1 orthologs. Structurally important amino acid residues that contribute to
the hydrophobicity of the LTP cavity were identified, supporting the idea that DIR1
binds a hydrophobic ligand during SAR. RNAi-mediated knockdown of the DIR1
paralog DIR1-like did not impact the SAR response, supporting the idea that DIR1-
like plays a lesser role in SAR. In addition, targeted protein-protein interaction assays
determined that LTP1 and LTP2 interact with DIR1, and SAR phenotypic analysis of
an ltp2-1 mutant supported a role for LTP2 in SAR. Lastly, a comparative proteomics
approach identified several proteins with differential abundance in phloem exudates
collected during the induction of SAR. Of these proteins, m-type thioredoxins, a
major latex protein-like protein, and the UV-B photoreceptor UVR8 were essential for
the manifestation of SAR. Together, these data provide insight into DIR1 function by
identifying the importance of cell-to-cell movement through plasmodesmata, the
DIR1 hydrophobic cavity, and DIR1-interacting proteins for DIR1-mediated SAR. In
addition, this work identifies new phloem-localized proteins that contribute to the
SAR response, providing fundamental knowledge on protein composition within the
phloem during biotic stress.

abstract: Dissertation

abstract: Doctor of Philosophy (PhD)


contributor:
Tso, W.K.
Civil Engineering

abstract: Title: Stiffness of Coupling Slabs in Shear Wall Buildings, Author: Adel A. Mahmoud, Location: Thode

abstract:
 In this thesis, a study was made on the coupling effect of floor slabs on the behaviour of shear wall structures . The slab coupled shear walls were analysed by the finite element technique to obtain the bending stiffness. Experimental verification was done on a small scale model of
steel walls coupled by a steel slab. Design curves to estimate the stiffness of the various slab coupled wall configurations are presented. In addition, a study was made on the influence of the dimensions and shapes of the
walls (plane walls, T-section walls and box core walls), wall openings, and slab dimensions on the effective width and stiffness of the connecting slab.

abstract: Thesis

abstract: Master of Engineering (ME)


title: Hollow Structural Sections in Flexure

contributor:
Korol, Robert M/
Civil Engineering

abstract: Title: Hollow Structural Sections in Flexure, Author: Janardan Prasad, Location: Thode

abstract:
A research programme is presented for assessing the capability of
Hollow Structural Sections for design in flexure. This investigation is the
continuation of earlier work on the topic which provided guidelines primarily for rectangular sections with relatively low flange slenderness. The present work attempts to relate the tube slenderness and yield strength to the rotation capacity and moment resistance of round sections subjected to bending moment. Also an attempt is made to establish similar guidelines for rectangular sections with relatively high flange slenderness.

An experimental programme on 16 different sections was performed to evaluate the moment-curvature relationship which is of fundamental importance in flexural design. The occurrence of local buckling in compression flange and the consequent reduction in moment resistance is the critical factor which separates the sections into the categories governed by allowable stress or plastic method of design.

An attempt is made to develop an analytical method to determine the critical buckling stress for round sections subjected to pure moment in the inelastic range.

The experimental results are compared with the analytical predictions. Finally a design criterion to separate the sections into the design categories is established.

abstract: Thesis

abstract: Master of Engineering (ME)


title: Poverty, Stress, and Happiness: Examining The Moderating Role of Psychological Capital On The Relation Between Poverty and Happiness Among Farmers and Fish Farmers in Ghana

contributor:
Hackett, Rick D.
Business Administration

subject: Poverty, Happiness, Stress, Psychological Capital, Ghana, Meaning, Pleasure, Engagement, Self Confidence, Resilience, Optimism, Hope, Culture, Religion, Field Study, Social Entrepreneurship.

abstract: Although much research has been conducted on the association between poverty and happiness, little is known about its mediators and moderators. Thus, our understanding of how – and the conditions under which -- poverty affects happiness is imprecise. This study assessed stress as a mediator of the negative association between poverty and happiness using a sample of 345 farmers and fish farmers living in Ghana. Further, Psychological Capital (PsyCap, consisting of hope, optimism, resilience, and self-confidence) was examined as a two-stage moderator of the poverty-happiness relationship, as mediated by stress. There was no support for the stage 1 moderation, and while there was support for stage 2 moderation, it was in a direction opposite from what was hypothesized (for overall PsyCap and PsyCapF2). The negative moderation at stage 2 suggests that PsyCap (overall and PsyCap2) is associated with a weakening of an unexpected positive association between stress and happiness. PsyCapF2, appears to reflect agency or general self-efficacy. Although the hypothesized model was not supported this study has provided insights into how future research of Ghanaians might be better designed. It also has shown that the positive PsyCap-happiness relationship found in several Western samples is replicable among Ghanaian farmers, a collectivist and highly religious community.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Maitlis, P.M.
Chemistry

abstract: Title: Tetrasubstituted-Cyclobutadienepalladium Halides, Author: David F. Pollock, Location: Thode

abstract:
Diphenylacetylenes, RC2R, (R=C6H5, p-ClC6H4 , p-CH3C6H4 , p-CH3OC6H4) reacted with
palladium (II) complexes to give [R4C4OEtPdC1]2 , or
[R4C4 (PdCl2)nI2 and R6C6. Hydrogen halides converted
[R4C4OEtPdCl]2 to [R4C4PdX2]2.

Particularly significant were the reactions in
which a cyclobutadiene (R4C4) was transferred from
palladium or nickel onto other metals. A very interesting
reaction was the unprecedented ligand exchange.

(R4C4PdX2)2 + 2(R'3P)2NiX2 -> (R4C4NiX2)2 + 2(R'3P)2PdX2

R'OH reacted with [R4C4PdX2]2 (except R=p-CH3OC6H4) to
give exo[R4C4OR'PdX]2 and acids reversed this reaction.
Some complexes [R4C4PdC5H5]+ were also made by ligand
transfer of the cyclopentadienyl ligand onto palladium.

1 H.N.M.R. studies of compounds derived from p,p'-disubstituted diphenylacetylenes showed that the phenyl
region of the spectrum could be used to determine if
the compound possessed the symmetry of a cyclobutadiene
compound.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: The Crystal Structure of Cu3(AsO4)2

contributor:
Calvo, C.
Physics

abstract: Title: The Crystal Structure of Cu3(AsO4)2, Author: Sandra J. Poulsen, Location: Thode

abstract:
The crystal structure of Cu3(AsO4)2 was determined
using a direct method of crystal structure analysis. The
crystal structure is described, and its features compared
to those of several compounds which have similar molecular
formulas. The method used in the structure determination
process is described, and an assessment of its general usefulness
is attempted.

abstract: Thesis

abstract: Master of Science (MS)


abstract: Title: Laboratory Studies of Frost Action in Soils with Special Reference to the Clay Mineral Fraction, Author: Gina A. Poloniato, Location: Thode

abstract:
The laboratory cold-room and its equipment have been designed
to enable studies to be made under controlled conditions of a11
frost phenomena occurring in soils which are reasonably adaptable
to investigation by laboratory methods.1 Although this particular
overall laboratory program incorporated various testing methods,
experiments, and analyses, it was designed chiefly to determine the
quantitative effects of individual variables which influence ice
segregation in soils. The variables that will be discussed in this
paper are as follows: (1) gradation and percent finer than 0.02mm;
(2) effect of compaction; (J) percent stone; (4) penetration of
32°F temperature; (5) temperatures between frozen and unfrozen soil;
(6) saturated clay in a closed system.2

abstract: Thesis

abstract: Bachelor of Arts (BA)


contributor:
Johnson, A.I.
Chemical Engineering

abstract: Title: Simulation of a Mixer - Settler Liquid Extraction Column, Author: Gary G. Pollock, Location: Thode

abstract:
Lagrangian interpolation and the Fibonacci search scheme were used in the steady - state simulation of a Scheibel extraction column on the IBM 7040 computer. The first technique allowed easy representation of graphical data in a form suitable for the digital computer while the second provided a powerful sequential search plan to carry out the trial and error
material balance calculation. The features of equilibrium and non-equilibrium models which utilized the above techniques are discussed and compared. The non-equilibrium model was also used to calculate the transient response which was then compared with experimental results. The Runge-Kutta-Gill process was used to integrate the transient
equations while Lagrangian interpolation was used to remove the restriction of a linear equilibrium relationship. Steady - state and transient experimental results used in the above calculations were obtained from the Scheibel extraction column in the Operations Laboratory.

abstract: Thesis

abstract: Master of Engineering (ME)


contributor:
Gentilcore, R.L.
Geography

abstract: Title: Agricultural Trends and Problems in Ukraine, Author: Eugene P. Potichnyj, Location: Thode

abstract:
Ukraine has long played a crucial roll in feeding both itself and much of the remainder of the Soviet Union. Recently, however, Ukraine's importance within the overall scheme of food production of the Soviet Union has decreased by some five (5) percent.

During the 1950's, Ukraine's production as a proportion of the overall Soviet production declined as a result of the development of the "New Lands" in Kazakhstan and Siberia. The following decade saw a resurgence in the importance of Ukraine, due primarily to the harsh weather conditions in the "New Lands". Since 1965, Ukraine has experienced a continual decline, which if uncorrected will continue into the foreseeable future.

Although the policies of the government focused on the development of the "New Lands", this is only one reason for the decline of Ukrainian productivity. Much of the blame can be placed on inefficient and careless management practices, the wasting of valuable land, the exploitation of workers, the undereducation of the working population, and the ineffective use of available technology. The blame for the decline must levied not against the people (workers), but against the system they are working under. As the system now stands, the only way to reverse this downward trend is by completely overhauling what is left of the agricultural sector. Due to the enormous costs which would be involved, it is highly unlikely that this will ever take place. It is, therefore, probable that Ukrainian agriculture will continue its downward slide in the years to come.

abstract: Thesis

abstract: Bachelor of Arts (BA)


contributor:
Siddall, J.N.
Design

abstract: Title: Design Optimization of a Shaft on Two Bearings, Author: Laurentiu Popa, Location: Thode

abstract:
The purpose of this project was to develop an aid to designing machinery shafts to find the optimum design for most shaft design applications met in design engineers' practices, to reduce the cost of the shafts.

The result was a computer package capable of handling the design optimization of step shafts supported on two bearings which will find the shaft design with minimum cost.

Additional benefits were obtained such as reducing engineering time and cost, increasing
reliability of the design, etc.

abstract: Thesis

abstract: Master of Engineering (ME)


title: Integrated Active Filter Auxiliary Power Modules in Electrified Vehicle Applications

contributor:
Emadi, Ali
Electrical and Computer Engineering

subject:
Active filters
Auxiliary power modules
DC/DC converters
Electrified vehicles
Dual-voltage charging systems
System integration

abstract:
In this thesis, integrated active filter auxiliary power modules (AFAPMs) is presented in electrified vehicle applications.
A topological evaluation is conducted particularly for the auxiliary power module (APM) applications in the electrified vehicles. Several primary and secondary base topologies are compared in terms of VA rating and performance. Multiple input/output topology configurations are compared with different connection configurations and control schemes. The MOSFET loss analysis is given. Based on the MOSFET loss analysis, the modular full bridge current doubler with input-series-output-parallel configuration presents better performance in terms of the switch efficiency and cost analysis.
Bulk capacitor banks occupy large volume and impact the reliability in the traction inverter and HV battery charger in the vehicle applications. A capacitor-less design is relatively urgent for the next generation electrified vehicle. Active filter (AF) is one potential solution to reduce the corresponding dc-link capacitance. However, additional components are required which increases the system complicity and decreases its reliability. Hence, it would be great to integrate the AF into the LV battery charger for the vehicle applications. Based on the power switch requirements, the AFAPM is evaluated for traction inverter and HV battery charger, respectively. The evaluation result shows that the AFAPM for the HV battery charger system is a feasible and attractive solution. Furthermore, a simple and effective dual-mode dual-voltage charging system operating principle is proposed. The integrated AFAPM converter charges the LV battery when the vehicle is running and operates as an AF when the vehicle is connected to the grid and the HV battery is charging. Hence, the low-frequency second-order harmonic current is alleviated without a bulk capacitor bank or an extra AF circuit in the HV battery charger.
For magnetic design, there is a trend toward integration and planarization. Two planar transformers are built for two different AFAPM prototypes. A minimized leakage inductance method is presented and implemented on a 20:1 center-tapped planar transformer.
Three different integrated AFAPM converters are proposed. By applying these AFAPM converters, the required extra components to form the AF for the HV battery charger are reduced and thus the cost, size and weight for the dual-voltage charging system in the electrified vehicle applications can be reduced. Two prototypes are built. The experiments show promising results confirming the effectiveness of the proposed converters.

abstract: Dissertation

abstract: Doctor of Philosophy (PhD)


contributor:
Middleton, G.V.
Geology

abstract: Title: The Study of the Diagenesis of the Lower Cretaceous, Niton Basal Quartz Sandstones of Western Alberta; with Specific Reference to the Porosity and Permeability Modification, Author: Daniel J. Potocki, Location: Thode

abstract:
Abnormal accumulations of kaolinite and illite clay
minerals, significantly reducing reservoir potential in
localized portions of the Niton Basal Quartz sandstones, have
prompted a detailed examination of the (clay) mineralogy
and diagenetic history of these sands. Scanning electron
microscopy and thin section analysis show that the bulk
of porosity reduction is by the accumulation of detrital
clays in sands where insufficient winnowing has occurred
during deposition in the deltaic environment. The progressive
assemblage of authigenic quartz overgrowths, authigenic illite
and authigenic kaolinite further reduce porosity and permeability
during diagenesis. Secondary kaolinite tends to infill sands
of high initial porosity. Oil migration occurs after the formation
of authigenic kaolinite and minor amounts of dissolution porosity,
Clay accumulations reduce but do not destroy reservoir potential
of the Niton Basal Quartz sandstones.

abstract: Thesis

abstract: Bachelor of Science (BSc)


title: Experimental Production of Sole Marks

contributor:
Middleton, G.V.
Engineering

abstract: Title: Experimental Production of Sole Marks, Author: R. A. Porter, Location: Thode

abstract:
A series of turbidity current experiments were
performed in an 8-foot flume. Plaster of Paris was used
to record the structures formed on a mud base.

These structures were related to the flow properties,
specifically turbulence. The structures formed were
pseudo-flutes, longitudinal ridges and furrows, tool
marks and triangular markings.

Comparison to other known work is made with varying
degrees of agreement or disagreement.

abstract: Thesis

abstract: Bachelor of Science (BSc)


contributor:
Summers-Gill, R.G.
Physics

abstract: Title: Multiple Quantum Transitions in Atomic Beam Magnetic Resonance, Author: Anton R. Pierce, Location: Thode

abstract:
The problem of multiple quantum transitions between the magnetic sub-levels of an atomic ground state hyperfine multiplet has
been investigated both experimentally and theoretically. Special
emphasis has been paid to the behaviour of these transitions as the
magnetic sub-levels of the hyperfine multiplet depart from equal
level spacing

The experiments performed determine the power dependence
of the multiple quantum transitions of Na23. These experiments led
to the establishment of a technique of determining transition multiplicity.

Expressions are also developed which permit the calculation
of transition probabilities for arbitrary values of multiplicity, r . f.
amplitude and degree of inequality of level spacing.

abstract: Thesis

abstract: Master of Science (MS)


title: Rural Development Planning and Labour Absorption: O'Higgins and Colchagua Provinces, Central Chile

contributor:
Lanfranco, Sam L.
Reeds, Lloyd G.
Geography

subject: rural development, planning, Labour absorption, O'Higgins, Colchagua, Chile, social, economic

abstract:
 During the last several decades, Chile has experienced development characterized by rapid social and economic changes. In conjunction with economic growth, Chile has experienced rural stagnation, a growing dependence on imported foodstuffs and a migration of rural population to the urban centres. Unemployment and underemployment exist in both the
rural and urban sectors.

 Economic planning in Chile must be directed in part to improving agricultural production, reducing the dependence on imported foodstuffs, and creating more employment opportunities in the rural sector.

 In this paper, the Chilean provinces of O'Higgins and Colchagua are examined with regard to the determinants of labour demand. A measure of rural unemployment (CH), calculated for thirty-two townships is analysed and evaluated as a planning tool. Variations in the demand for labour and the estimated levels of unemployment (CĤ) are analysed with reference to the physiographic characteristics of the townships, land use, and the system of land tenure.

 It was found that spatial distribution of the supply of labour is a function of the location of labour demand and that surplus labour tends to move toward the minifundios and the urban areas. Land use and the choice of technique appear to be strongly influenced by land tenure and
access to markets in addition to being determined by land capability. The paper concludes with a discussion of the planning and policy implications of the study.

abstract: Thesis

abstract: Master of Arts (MA)


title: Toward an African Animal Studies: On the Limits of Concern in Global Politics

contributor:
Strauss, Helene
English and Cultural Studies

subject:
animal studies
postcolonialism
African studies
animality
concern
Rwandan genocide

abstract: This project attempts to bridge conversations between the predominantly Western canon of animal studies and the frequently humanist approach to postcolonial African studies. Drawing on these sometimes incompatible fields, this thesis proposes two premises that emerge from close readings of African cultural texts. First, “Africa” as a discursive construct has long been associated with animals, animality, and the category of the nonhuman, evident in, to give some examples, the current touristic promotion across the globe of African wildlife as an essential part of its continental identity, local and global anxieties over zoonotic transmissions of disease, and the history of race science’s preoccupation with animalizing black and indigenous African bodies. My second premise suggests that in postcolonial and especially African contexts ostensibly “human” concerns are inextricably tied to both the categorical limitations imposed by imperial paradigms of animalization and the precarious existence of nonhuman animals themselves, concern for whom is often occluded in anthropocentric postcolonial discourse. In my dissertation, I examine the role that texts play in directing affective relations of concern locally and globally, reading fictional texts as well as news media, conservation literature, and tourist advertisements. Through these works I examine the complex and often cantankerous politics of cultivating interspecies concern in postcolonial contexts, ranging from the globalized commodification of African wildlife and the dubious international policies that ostensibly protect it, the geography of the North American safari park, the animalization of queer bodies by African state leaders, textual representations of interspecies intimacy, and accounts of the Rwandan genocide.

abstract: Dissertation

abstract: Doctor of Philosophy (PhD)

abstract: This thesis responds to the question of how we show concern for animals in postcolonial, globalized, and postconflict worlds. Drawing on the example of multiple texts in African literature, film, and other media, it explores how Africa itself has long been construed in the global imagination as a zone associated with animality. This association appears in texts produced within the West and Africa whose accounts of the continent imagine it to be outside the realm of human ethical concern. Demonstrating how exclusive human ethical concern is for African lives, both human and animal, this thesis argues for an ethics of concern that does not revolve around exclusively the human in postcolonial African studies.


title: The Cycloheptatriene-Norcaradiene Equilibrium

contributor:
Childs, R. F.
Chemistry

subject: equilibrium, cycloheptatriene-norcaradiene, thermal, isomerization, compounds, diamagnetic, ion

abstract:
 The effect of a C-7 substituent on the position of the cycloheptatriene/
norcaradiene equilibrium has been investigated. For this purpose a series of monosubstituted cycloheptatrienes was prepared in which the C-7 substituent was a carbonium ion grouping. From the spectral properties of these systems, it has been concluded that proportion of the norcaradiene valence tautomer present increases as the electron withdrawing ability of the carbonium ion substituent is enhanced.

 From a comparison of the pmr spectra of 7-norcaradienylmethyl cations with suitable model systems it is suggested that these norcaradienes are aromatic and that they support an induced diamagnetic ring current when in a magnetic field. It would appear that this type of cyclic delocalization is enhanced by the presence of an electron defficient substituent at C-7 of a norcaradiene and possible reasons
for this are discussed.

 The 7-norcaradienylmethyl cations underwent a thermal isomerization to give benzenoid materials at relatively low temperatures. A mechanism for this rearrangement has been proposed and the implication of these results to the general pathways involved in the rearrangements of the C8H9+ family of cations discussed.

 Several synthetic routes to 9-substituted-3,4-homotropylidenes were investigated. A number of new compounds were isolated and a new synthetic approach to this class of compounds is suggested.

 Diamagnetic susceptibility exaltations of a series of substituted
cycloheptatrienes were determined and used as a criterion of aromaticity. It was concluded that cycloheptatrienes are best regarded as homoaromatic molecules. Moreover it would appear that the substantial diamagnetic susceptibility exaltations observed with these compounds are related to the bulk of a C-7 substituent. One neutral norcaradiene was examined by this technique and was found to be nonaromatic.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Cameron, J.A.
Physics

abstract: Title: Measurement of Internal Field in Hafnium 177 in Gadolinium, Author: Fakhr-Un-Nisa Rafai, Location: Thode

abstract:
An alloy of 1% lutecium in 99% gadolinium was
made. The rotations of the angular correlation pattern
caused by the hyperfine fields acting on hafnium nuclei were
measured for the 208-113 keV and 71-250 keV cascades. Using
measured data the internal field acting on hafnium in
gadolinium and the g-factor for the 250 keV spin 11/2, second
excited state, were determined.

The results are as follows:
Hint = - (252 ± 14) k0e g11/2 = (.346 ± .087).

abstract: Thesis

abstract: Master of Science (MS)


contributor:
Gillespie, R.J.
Chemistry

abstract: Title: Nuclear Magnetic Resonance Studies of Group V Pentaflourides and Related Compounds, Author: Uppaluri R. K. Rao, Location: Thode

abstract:
19F n.m.r. spectra of the pentafluorides of the group V elements and their variation with temperature have been studied and interpreted.

Theoretical n.m.r. line shapes of 19F coupled to a high-spin nucleus with I = 7/2 and 9/2 have been calculated and their
application to the temperature dependence of the 19F n.m.r. spectra in VOF4- and NbF6- respectively has been demonstrated. Temperature dependence of the n.m.r. line shapes of the high-spin nucleus in 11BF3 and VOF4- was studied and it was shown that in each of these
species the n.m.r. spectrum of either nucleus can be explained in terms of the same parameters, namely, the coupling constant and relaxation time.

A method for explaining the observed 19F n.m.r. line-widths in VF5 and AsF5 is given.

51V n.m.r. chemical shifts in some vanadium containing compounds were measured and are discussed.

Some remarks are made regarding electric field gradients at the central nucleus in asymmetric molecules and in particular, in 5-cordinate molecules.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Hoffman, T.W.
Chemical Engineering

abstract: Title: Effect of Surface Active Agents in Boiling Heat Transfer, Author: Subbarao N. Rao, Location: Thode

abstract: The boiling heat transfer phenomenon has presented a state o ambiguity regarding the role of solid-liquid-vapour interface in the mechanisms of heat transfer. Recent studies (S1, M1) have given an indication to the possibility of the vaporization of a micro layer at the boiling surface as a alternative to the well known theories based purely on the hydrodynamic factors. This study is an attempt to understand the boiling heat transfer mechanism at solid-liquid-vapour interface and to study the effect of interfacial properties like surface tension and contact angle on the maximum (critical) heat flux. The present studies use the technique of changing the solid-liquid-vapour interface characteristics of water through the use of surface-active agent as additive, to study the boiling heat transfer under changed interface conditions. Four different surfactants were used at three levels of concentration in water. Surface tension and contact angle measurements were carried out using the shadow photographs of pendant cops and sessile drops. Boiling heat flux measurements of these surfactant solutions in water were carried out using heat transfer surface. Experiments involving pool boiling and the boiling of thin liquid films were carried out over the transition and nucleate boiling regimes. It has been observed that the solid-liquid-vapour interface characteristics play a cry important role in the boiling heat transfer mechanism. By a suitable choice type of surfactant and concentration, the critical heat flux and heat transfer coefficients can be improved markedly. It is suggested that the spreading wetting characteristic improves the heat transfer rate whereas the increased viscosity and decreased thermal conductivity of the liquid microlayer under the vapour masses may cause the heat flux to decrease. The present study shows significant possibilities for future studies in the nucleate boiling, transition boiling and film boiling regimes using surfactant solutions.

abstract: Thesis

abstract: Master of Engineering (ME)


contributor:
Purdy, G.R.
Dawson, P.T.
Metallurgy and Materials Science

abstract: Title: A Field Ion Microscope Study of Interfaces, Author: Ramesh Rajagopal, Location: Thode

abstract:
This investigation is concerned with the observation of interfaces between f.c.c. and b.c.c. crystals in the field ion microscope. A high vacuum field ion microscope was designed and constructed to operate under liquid nitrogen cooling and helium gas imaging, with facilities for vapour deposition. Platinum and iridium were deposited on tungsten field ion emitters by shadow vapour deposition.

The nature and contrast of deposits obtained under various experimental conditions are examined. The atomic matching observed at interfaces is discussed within the limitations of the existing interfacial contrast theory.

abstract: Thesis

abstract: Master of Engineering (ME)


contributor:
Mak, Stanley
Biology

abstract: Title: A Correlation of the Molecular Damage and Biological Functions of the Human Adenovirus Following UV and Gamma Irradiation, Author: Andrew J. Rainbow, Location: Thode

abstract: The expression of several different functions of the oncogenic human adenovirus type 12 and non-onconogenic human adenovirus type 2 were examined after infection of the human KB cells. Also, following UV and gamma irradiation of the virus, the molecular damage included in the viral DNA was correlated with the biological functions expressed by the radiation induced defective virus particles. The results were discussed in relation to the current ideas of viral oncogenesis ad the mechanism of radiation DNA damage and repair in other organisms.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Heidebrecht, A.C.
Civil Engineering

abstract: Title: Behaviour of Shear Wall Models with Circular Wall Openings, Author: Aejaz A. Qureshi, Location: Thode

abstract: This thesis describes the development of a technique to build small scale shear wall building models containing circular wall-openings without floors, using a suitable concrete mortar. Tests were conducted to study the behaviour of such models under lateral static loads. The behaviour of these models is compared with those containing no wall openings. The test and analytical results as predicted by Vlasov's theory are compared to investigate the effect of such openings in shear wall models. Analysis of the problem is also attempted using Rosman's shear connection approach.

abstract: Thesis

abstract: Master of Engineering (ME)


contributor:
Kirkaldy, J.S.
Physics

abstract: Title: Attenuation and Velocity of Ultrasound Near the Critical Point of Gallium-Bismuth, Author: Manfred P. Puls, Location: Thode

abstract: Attenuation measurements were performed on a liquid Ga-Bi mixture above its miscibility gap and at the frequencies 16.6, 25.5, 37.6 and 49.7 MHz. The attenuation measurements were made over a composition range from 0.20 to 0.75 weight-fraction Bismuth and in the temperature range 0.3 to 9.9°C above the critical temperature of the mixture. For a mixture at the critical composition, attenuation measurements were also made 27.2°C above the critical temperature. The velocity of sound was measured at 25.5MHz and at each of the above temperature and composition points. The critical temperature and composition of the Ga-Bi system have been determined to improve accuracy as 263.1°C and 0.60 weight-fraction Bismuth, respectively. The attenuation results have been tested against current theories and these theories have been subject to critical analysis.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: DEFECTIVE TrkB SIGNALING PATHWAYS IN IDIOPATHIC AUTISM

contributor: Medical Sciences (Division of Physiology/Pharmacology)

subject: Autism, LM22A-4, TrkB, VPA, Animal Model

abstract:
Autism is a neurodevelopmental disorder characterized by impairments in social communication and interaction and by repetitive patterns of behaviour, interests and activities. It is perhaps the most common and handicapping neurological disorder of childhood and as such represents a significant public health problem and a huge burden for education and social service systems. Currently there is no diagnostic test or cure available for autism and the molecular mechanisms underlying autistic behaviour remain to be elucidated. Mutations in genes linked to autism adversely affect molecules involved in synapse development and plasticity including brain-derived neurotrophic factor receptor (TrkB) and its downstream effector mammalian target of rapamycin (mTOR), which is increased in several forms of syndromic autism.
Here, we investigated whether TrkB, mTOR and their signaling pathways are disrupted in postmortem brain tissue from subjects with idiopathic autism, that is, cases of autism without a known genetic cause and thought to be of environmental/epigenetic origin. We next further examined the contribution of defective TrkB signaling to autistic behaviour in mice exposed to the histone deacetylase inhibitor valproic acid (VPA), a well-established model of environmental/epigenetic origin of autism.
We found that TrkB signaling pathways were reduced in idiopathic autism and that these disruptions were associated with decreased excitatory postsynaptic marker PSD-95, suggesting fewer excitatory synapses. Moreover, we showed that similar molecular deficits were present in VPA-exposed mice that lacked sociability and displayed increased repetitive, stereotyped behaviour. We also determined that behavioural deficits in these mice were rescued by administration of the partial TrkB agonist LM22A-4 but not by treatment with the active tripeptide fragment of the insulin-like growth factor-1, (1-3)IGF-1. Lastly, reduced TrkB signaling in VPA-exposed mice was normalized by LM22A-4 administration combined with behavioural enrichment.
The present work provides a better understanding of the molecular mechanisms that contribute to autistic behaviour and implicates TrkB signaling in autism pathogenesis. Furthermore, these data demonstrate that molecular changes observed in brains of patients with idiopathic autism differ from syndromic forms and highlight that both too much and too little signaling can be equally disruptive. The present work also shows that maternal challenge with VPA resulted in social deficits, increased repetitive, restrictive behaviour and reduced TrkB signaling in mice, pointing to epigenetic modifications as a potential underlying mechanism of molecular and behavioural disruptions in autism. Lastly, these findings suggest that pharmacological activation of TrkB using compounds such as the partial TrkB agonist LM22A-4 might play a role in treating sociability and repetitive, perseverative behaviour in autism.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Physics-Based Modeling of Direct Coupled Hybrid Energy Storage Modules in Electrified Vehicles

subject:
Physics-based modeling
Lithium-ion battery
Ultracapacitor
Hybrid energy storage system
Electrified Vehicles
Energy storage system
Energy management system

abstract:
In this thesis, a physics-based single particle modeling is presented to analyze a proposed direct coupled hybrid energy storage modules using lithium-ion battery and ultracapacitor.

Firstly, a state of the art for the energy storage system in the electrified vehicles are summarized. Several energy storage elements including lead-acid battery, nickel-metal hydride battery, lithium-ion battery, ultracapacitor, and lithium-ion capacitor are reviewed. Requirements of the energy storage systems in electric, hybrid electric, and plug-in hybrid electric vehicles are generalized. Typical hybrid energy storage system topologies are also reviewed. Moreover, these energy storage elements and hybrid energy storage system topologies are compared to the requirements of the energy storage systems in terms of specific power and specific energy.

Secondly, the performance of different battery balancing topologies, including line shunting, ring shunting, synchronous flyback, multi-winding, and dissipative shunting are analyzed based on a linear programming methodology. As a traction battery in an electric or plug-in electric vehicle, high voltage lithium-ion packs are typically configured in a modular fashion, therefore, the analysis considers the balancing topologies at module level and cell level and focuses on minimum balancing time, minimum plug-in charge time, minimum energy loss, and component counts of every balancing topology for the entire battery pack.

Thirdly, different modeling techniques for the lithium-ion battery and ultracapacitor are presented. One of the main contributions of this thesis is the development of a physics-based single particle modeling embedded with a solid-electrolyte interface growth model for a lithium-ion battery in battery management system. This development considers the numerical solution of diffusion equation, cell level quantities, parametrization method, effects of number of shells in a spherical particle, SOC-SOH estimation algorithms, and aging effects. The accuracy of the modeling is validated by experimental results of a Panasonic NCR18650A lithium-ion battery cell.

Fourthly, the physics-based modeling is applied to analyze the performance of a proposed direct coupled hybrid energy storage module topology based on the Panasonic NCR18650A lithium-ion battery and Maxwell BCAP0350 ultracapacitor. There are many ways to directly connect battery cells and ultracapacitor cells in a module which would influence the performance of the module. The results show that a module has 9 cells in a battery string and 14 cells in an ultracapacitor string can obtain the highest power capability and utilize the most of the energy in an ultracapacitor. More ultracapacitor strings connected in parallel would increase the power density but reduce the energy density. Moreover, the simulation and experimental results indicate that the direct coupled hybrid modules can extend the operating range and slow the capacity fade of lithium-ion battery. An SOC-SOH estimation algorithm for the hybrid module is also developed based on the physics-based modeling.

Finally, a pack design methodology is proposed to meet U.S. Advanced Battery Consortium LLC PHEV-40, power-assist, and 48V HEV performance targets for the battery packs or the proposed direct coupled topologies. In order to explore replacement tradeoffs between the battery and ultracapacitor, a case study of the direct coupled topologies is presented. From the case study, ultracapacitors enhance the power capability for short term pulse power and marginally reduce the cost of an entire energy storage system. Moreover, the hybrid module topologies can keep a relatively long all-electric range when the batteries degrade.

abstract: Dissertation

abstract: Doctor of Philosophy (PhD)


title: Preparation and Characterization of Thin Copper Sulfide Films for their Application in Solar Cells

contributor:
Shewchun, J.
Physics

subject: preparation, characterization, thin copper sulfide films, solar, cells, semiconductor, heterojunctions

abstract:
 Two methods for preparing semiconductor grade copper sulfide films, to be used in low cost thin film solar cells,have been investigated. The sulfurization method involves the controlled chemical conversion of copper films into the desired copper sulfide phase. The other method of evaporating Cu2S pellets is more adaptable for an all evaporated thin film solar cell. The copper sulfide films obtained by these methods were characterized using x-rays, cathodoluminescence, electrical and optical methods. The use of optical method in monitoring the stoichiometry of thin copper sulfide films has been illustrated. The photovoltaic properties
of thin copper sulfide films obtained by these methods, were also investigated using Cu2S - Si heterojunctions. The behaviour of these junctions indicates that 900 Ȧ thick copper sulfide film is required for optimum photovoltaic conversion. This result may be of some importance in Cu2S - CdS solar cells in further reducing their thickness. Cu2S - Si heterojunctions can also be used to monitor the properties of copper sulfide, as silicon is a well characterized substrate.

abstract: Thesis

abstract: Master of Science (MSc)


contributor:
King, Leslie J.
Geography

abstract: Title: Inter-Urban Industrial Migration: A Simulation Model of Plant Site Selection and Its Application to Metropolitan Toronto, Author: Joseph A. Olagbaiye, Location: Thode

abstract:
A simulation model is developed for predicting the distribution of plant site selections by migrant  firms within an urban ares for a defined period of time. A model is based on the assumption that a particular migrant plant (k) from origin i will locate at potential destination j depending upon the attributes of j, distance between i and j, and the space requirement level of the plant as determined by its industry type and employment characteristics.

The model is operated by using the Monte Carlo method. The parameters of the model are derived empirically. These parameters are then incorporated in a formal application of the model to Metro Toronto for the period 1966-67. A chi-square goodness fit test between the predicted and empirical distributions, as well as a continuity ratio test performed on the residuals, shows that the difference between the two distributions may have been produced by chance.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Level Structure of 191Ir and 193Ir

contributor:
Johns, M. W.
Physics

subject: level, structure, radioactive decay, electrons, Coulomb, gamma rays

abstract: A variety of experiments has been performed in order to establish and identify the states in 191Ir and 193Ir. From radioactive decay, the energies and intensities of the gamma rays and internal conversion electrons have been measured with high precision using Ge(Li) detectors and the Chalk River π√2 spectrometer. A series of gamma-gamma coincidence experiments were performed using Ge(Li) detectors. The gamma rays following Coulomb excitation of 191Ir and 193Ir were also measured with Ge(Li) detectors. In addition, (3He,d) and (α,t) transfer reactions were performed and the reaction products analyzed by means of an Enge split-pole spectrograph. From these data, the energies, spins, parities and spectroscopic factors for the states in 191Ir and 193Ir have been established and interpreted in terms of the Nilsson model with band mixing.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Dukas, Reuven
Psychology

abstract: Title: Caffeine Tolerance in the Fly Drosophila Melanogaster, Author: Luca B. Prevot, Location: Thode

abstract:
Responding to cues that precede and signal important biological events (anticipatory learning) may have important fitness consequences. Anticipatory learned responses have high adaptive value when intervene in the regulation of physiological states, and one widely studied example of learning-mediated homeostatic regulation is tolerance to drugs.  Physiological responses that offset drugs' effects, like many other autonomic responses, can become classically conditioned to environmental cues that are repeatedly paired with drug intake. Caffeine is a widely used model substance for studying mechanisms related to drug intake, tolerance and addiction. In this report I provided evidence of tolerance development to some caffeine effects in the fruit fly, Drosophila
melanogaster, which is a novel finding. I then showed that the tolerance is mediated by classical conditioning. A surprising result was that tolerance was completely and not, as more generally found, only partially mediated by conditioning. Together with other drugs, caffeine appears to be a promising substance to be used in the fly to study the pharmacology of substances with addictive potential. Also, these results indicate that this
system may be an optimal model for the study of the adaptive value of learning in an insect species.

abstract: Thesis

abstract: Master of Science (MS)


title: A Density Approach to Chemical Binding

contributor:
Bader, R. F. W.
Chemistry

subject: density, chemical, binding, electronic structure, molecular systems, repulsion

abstract: The material presented in this thesis is an attempt to obtain an increased understanding of the electronic structure and chemical binding in molecular systems. The one-electron charge distribution in methane, which is derived by considering only one-electron dependent properties of the system, is used to analyze the chemical binding in this molecule. A theoretical method, which allows one to determine the effect of the Pauli exclusion principle on the one-electron density distribution, is used to test the concepts underlying the electron pair repulsion theory as applied to H2O and NH3. Kinetic energy distributions are defined in order to examine the relationship between the topographical features of the molecular one-electron charge distribution and the kinetic energy of the system.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Decay of La142

contributor:
Kennett, T. J.
Physics

subject: decay, scintillation,radiations, gamma-ray, beta, nuclear structure

abstract: Techniques of beta- and gamma-ray scintillation spectroscopy have been applied to a study of the decay radiations from 92.6-min La142. Several new gamma-ray transitions have been discovered and a gamma-gamma coincidence matrix has been established. Nine beta groups have been identified and evidence is presented substantiating the assignment of a first-forbidden unique character to the ground-state beta transition. Angular correlation studies have been performed on some of the gamma cascades. A decay-scheme based on the experimental results is discussed and some spin assignments are made. Some features of the decay modes are interpreted within the context of contemporary ideas about nuclear structure.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: The Hammett Acidity Function for Some Superacid Media

contributor:
Gillespie, R. J.
Chemistry

subject: Hammett Acidity, function, superacid media, dilute solutions, solvent

abstract: The Hammett acidity function, Ho, has been extended from dilute solutions of water in sulfuric acid to the highly acidic HSO3F-SbF5•3SO3 system, a range of more than eight Ho units. The protonation behaviour of eleven aromatic nitro indicators was studied by means of a spectrophotometric technique. These indicators were found to behave in a similar fashion to the previously studied aniline indicators which have been used to define the Ho function from infinitely dilute solutions of acids in water to concentrated sulfuric acid solutions. The superacid systems studied were H2O-H2SO4-SO3, H2SO4-HSO3Cl, H2SO4-HSO3F, H2SO4-HB(HSO4)4, KSO3F-HSO3F, HSO3F-SO3, HSO3F-AsF5, HSO3F-SbF5, and HSO3F-SbF5•3SO3 of which the latter is the most acidic solvent system known.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
McCalla, D.R.
Biochemistry

abstract: Title: Damage to Mammalian Cell DNA by Nitrofurans, Author: Peggy L. Olive, Location: Thode

abstract:
Nitrofurans, initially developed in the 1940's as antibacterial agents, have recently been shown to be mutagens and carcinogens. Present studies indicate that DNA may be an important target and that reductive 'activation' of the nitrofurans is likely before DNA damage occurs.

Mammalian cells contain the enzymes necessry for reduction of nitrofurans, a process which occurs at maximum rates under anaerobic conditions. Toxicity of nitrofurans, as measured by cell survival, is maximum under nitrogen, and is also dependent on temperature, medium of incubation and position of the cell in the growth cycle. ATP and DNA synthesis are inhibited in air as well as nitrogen, while RNA and protein synthesis are often elevated in air but not in nitrogen. Phytohemaglutinin stimulation of human lymphocytes is inhibited when these cells are incubated with nitrofurans under nitrogen prior to stimulation/

DNA single-strand breaks can be found in several cultured mammalian cell lines after incubation with nitrofurans. The extent of damage is dependent upon the oxygen concentration, nitrofuran used, drug concentration (including drug/cell ratio), and the duration of exposure. Rejoining of breaks is influenced by the extend of damage with proprtionately less repair after extensive breakage. Ascited cells incubated with nitrofurans in situ also show single-strand breaks which can be rejoined following elimination of the drug.

Cells irradiated with UV or gamma rays, then incubated with nitrofurans, show enhanced damage (single strand breaks, or cell death) when incubation occurs in air or nitrogen. The position of the cell in the growth cycle influences the extent of DNA damage with cells being most sensitive at the G1/S interface. Plateau phase cells are more sensitive to such damage than exponentially growing cells.

Some organs of mice labelled with radioactive thymide show a loss of radioactivity following nitrofuran feeding. It is not possible to conclude whether this loss is due exclusively to cell death and replacement, or to repair of damaged DNA. This decrease occurs in a biphasic manner, with rapid initial loss that suggests DNA repair as well as cell replacement.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Measurements of the Microwave Conductivity of N-Type Germanium

contributor:
Gunn, M. W.
Campbell, C. K.
Electrical Engineering

subject: microwave, measurements, conductivity, n-type, germanium, semiconducting, field vector

abstract:
 An investigation has been made of the microwave reflections from the surface of a semiconducting medium with complex permittivity (^ε = εrεo -jσ/ω) at the open end of
an empty rectangular waveguide. The approximate and exact solutions of the reflection coefficients at the surfaces of both finite and semi-infinite media have been found as a function of the complex permittivity of the medium. The computations of the reflection coefficients are made at the 10 and 35 GHz ranges. Measurements, which confirm these
calculations, have been performed with n-type germanium, selectron, and air at the open end of a rectangular waveguide using a reflection type microwave bridge. The investigation has shown that it is possible to devise a convenient method of measuring the conductivity and dielectric constant of semiconductors.

 The theory of operation of the microwave reflection bridge together with the setting-up (matching) procedure of a practical form of the bridge has been presented. A method is also described for the correction of the measurement
error which arises from the scattering coefficients at the input ports of the precision attenuator.

 A theoretical and experimental study has also been made of the small- signal microwave conductivity of n-type germanium at room temperature in the presence of a high electric field, directed at an angle θ to the microwave field. The study has shown that at frequencies such as 10 GHz, the microwave conductivity becomes anisotropic with respect to the direction of the d.c. field vector. Measurements are made on an 11.4 ohm cm, n-type germanium sample at 9.381 GHz with applied electric fields up to 1.8 KV/cm for θ = 0°,
40°, and 90°. The ''open-end-waveguide measuring technique", which allows the angle between the microwave and d.c. field vectors to be varied, was employed to measure the microwave conductivity. The results of measurements which agree with predictions, confirm the feasibility of operation of a new microwave device based on the anisotropic effect.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: MacVenture: An iPad Application Design for Social Constructivist E-Learning

contributor:
Anand, Christopher
Computing and Software

subject:
educational technology
iPad education
social constructivism
learning theories
iPad application design

abstract: Several countries are beginning to introduce computer science education at an elementary school level in response to the increasing demand of technologically skilled workers.  In the transitionary period of establishing the curriculum and expectations, there is an opportunity to revolutionize certain aspects of the teaching and learning process within the classroom.  In many ways, we can use technology to enhance this experience.  For teachers, it can automate repetitive tasks, as well as provide immediate feedback on class progress.  For students, it can offer engaging interfaces, helpful hints and innovative ways to collaborate with one another. To put this challenge and opportunity into context, we review what is known about learning  theories,  and  survey  existing  applications.   A  large  majority  of  these  applications  support behaviourist learning  styles,  what  most  would  call  "traditional" teaching methods.  Much like pen and paper drill exercises, they reinforce information  previously  presented  to  the  user  for  passive  consumption.   This  is  in  spite  of the fact that academic researchers strongly favour constructivist and especially social constructivist methods.  In fact, this perpetuates a known gap between theory and practice  in  education,  and  may  be  contributing  to  the  lack  of  adoption  within  the classroom. MacVenture is an iOS application designed to facilitate social constructivist teaching styles by allowing students to create gamebooks for themselves and for their peers by incorporating material from across the curriculum.  This work outlines the structure and design of MacVenture, presents examples to illustrate the range of uses it supports,  and  discusses  proposed  future  developments  to  enable  new  methods  for collaboration among peers, and new motivational and analytical tools for teachers.

abstract: Thesis

abstract: Master of Science (MSc)


title: Galaxy Properties Across Diverse Halo Environments

contributor:
Parker, Laura
Physics and Astronomy

abstract: Correlations between galaxy properties and environment have been observed in many environments, showing that red, quiescent, early-type galaxies are found preferentially in dense regimes. This thesis uses a large sample of SDSS group galaxies to further probe these environmental dependences, with a focus on determining the properties of galaxies across different halo environments. We first investigate the mass segregation of galaxies in haloes of groups covering a wide range of masses. We find significant mass segregation in low-mass groups with the strength of mass segregation decreasing with increasing halo mass – to the point where high-mass clusters show no detectable mass segregation. We also find that mass segregation trends are more prominent when including lower mass galaxies. Similar trends are observed when considering the fraction of massive galaxies as a function of radius as opposed to mean galaxy mass. Secondly, we study the star formation and morphology of satellite galaxies in different halo environments. Specifically, we probe beyond the well established correlations with stellar and halo mass and investigate the dependence of star-forming and disc fractions on group X-ray luminosity. We show that galaxies in X-ray underluminous groups have enhanced star-forming and disc fractions, for a given stellar and halo mass. These observations contribute to the understanding and interpretation of the environmental dependence of galaxy properties by providing a framework with which the lack of consensus regarding the presence of mass segregation in groups and clusters can potentially be reconciled, as well as quantifying new correlations with X-ray luminosity beyond the established dependences on halo mass.

abstract: Thesis

abstract: Master of Science (MSc)


contributor:
Datars, W.R.
Physics

abstract: Title: de Haas-van Alpen Effect and Azbel'-Kraner Cyclotron Resonance Studies for Mercury, Author: Robert G. Poulsen, Location: Thode

abstract:
Previous studies of the mercury Fermi surface by
Azbel'-Kaner cyclotron resonance and the de Haas-van Alphen
effect have been extended and clarified and several new orbits
have been observed. The results are in qualitative
agreement with the topologies of current models of the
Fermi surface.

Measurements of the temperature dependence of the
cyclotron effective mass and the collision relaxation time
for an electron lens orbit have provided new experimental
evidence for electron-phonon mass enhancement and the influence
of Umklapp processes in determining the relaxation
time.

Several methods for orienting mercury crystals within
the experimental apparatus have been developed.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Risk, M.J.
Geology

abstract: Title: Algal Mats and Cryptalgal Structures, Boca Jewfish, Lac, Bonaire, Netherlands Antilles, Author: Brian R. Pratt, Location: Thode

abstract:
Algal mats form a variety of sediment- stabilizing cryptalgal structures
in the Boca Jewfish area of the Lac, Bonaire. These structures are related to the blue-green algal communities that comprise the mats, desiccation during intertidal periods and current action. Variation in these parameters produces a zonation of external morphologies of cryptalgal structures. Sediment is agglutinated onto mucilage secreted by fine filaments of blue-green algae in subtidal and intertidal oncolites. Sediment is trapped and enmeshed by blue-green algae in the rigid smooth mat. Subtidal colloform mats hold sediment loosely by entrapment and agglutination onto mucilagenous algal sheaths. The sediments of the tufted mat zone are caught and bound by large sticky filaments. Lithification of oncolites and chunks of smooth mat occurs in the intertidal by growth of pore-destroying fibrous aragonite cement. Indurated crust pavements that are found in the study area appear to have been cemented in the intertidal and supratidal environment. Cementation here is principally cryptocrystalline aragonite.

In the present regressive stage in the Lac, there has not been sufficient time for significant vertical accretion in the smooth and tufted mat zones.

abstract: Thesis

abstract: Bachelor of Science (BSc)


title: 77Se and 19F NMR Studies of Selenium Compounds

subject: selenium, compounds, NMR, adducts, bases, Lewis acidity, structures

abstract:
 A 19F nmr study has shown that SeO2F2, SeOF2 and SeOCl2 behave as bases (B) towards SbF5 forming the adducts, (SbF5)n•B where n = 1-5 and in which they are bonded to
antimony through an oxygen. Structural information about these adducts was also obtained. Solutions of SbF5 in SeOF2 and SeOCl2 were also shown to contain the SbF-6 and cis and
trans [SbF4 (B)2]+ ions. The order of basicity towards SbF5 for the following bases is, SeOCl2 > SeOF2 > SbF-6 > SOF2 > SeO2F2 > SO2ClF.

 A 77Se nmr study of the SeOCl2 solvent system has shown that the order of Lewis acidity for the following acids is, SbF5 ~ SO3 > SbCl5 > SnCl4 > SbCl3 > AsCl3.

 A new selenium oxyfluoride, SeOF4 has been identified and is shown to form an ionic adduct SeOF+3SbF-6 with SbF5.

 Polyselenium oxyfluorides, F(SeO3)nSeO2F, where n=1-3, were prepared and are found to have acyclic structures. The 77Se spectra of Se4^2+ and Se8^2+ were studied.

 Redistribution reactions between selenium and phosphorus halides and oxyhalides were studied using the nmr resonances of 19F, 31P and 77Se.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Kardos, G.R.
Mechanical Engineering

abstract: Title: Study of Numerical Solutions for the Deformations of A Bourdon Tube, Author: Govind Prashad, Location: Thode

abstract:
The objective of this study is to compute numerically the deformations on an elliptical cross-sectional bourdon tube by solving the partial differential equations as presented
by Lee [Reference 12].

The partial differential equations and boundary conditions are reduced to a set of simultaneous linear equations by approximating partial derivatives to the corresponding difference quotients sing finite difference techniques.

The next step involves the solution of this set of linear equations. The direct method of inverting the matrix was not possible to the memory limitations of the computer. Therefore, a block iteration technique was used, but it was found that convergence was not possible. The next method evolved was that of double iteration. for this method a convergence test was applied which indicated that convergence was possible, but the rate of convergence was very low.

It is not practical to use this method, unless the convergence rate is improved. At the present no method is available to improve the convergence rate effectively. Therefore the study concludes with suggestions that either the convergence rate should be improved by evoking new methods or an entirely new formulation of the problem should be made.

abstract: Thesis

abstract: Master of Engineering (ME)


contributor:
Miller, J.J.
Biology

abstract: Title: A Study of Physiological and Morphological Changes in Sporulating Cells of Saccharymyces cerevisiae, Author: Roderic D. Pontefract, Location: Thode

abstract:
An aeration technique is described which gave high and consistent yield of yeast spores.

Nuclear structures and divisions were studied in both vegetative and sporulating cells. The variation in glycogen and fat content of such cells was followed. These features of internal morphology are described and illustrated by five plates of figures.

A comparison was made if the respiration of vegetative and sporulating cells in the presence and absence of substrate.

Attempts were made to detect dipicolinic acid (pyridine-2,6-dicarboxylic acid) in yeast spores but no positive results were obtained. The comparative physiological significance of this is discussed.

 Correlations are made of certain physiological and cytological changes observed during the sporulation process.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Mechanistic Studies on the Photoaddition Reactions of Some 2-Cyclohexenones with Norbornadiene and Cyclopentene

contributor:
McCullough, J. J.
Chemistry

subject: mechanistic, photoaddition reactions, cyclohexenones, norbornadiene, cyclopentene, intramolecular, excited states

abstract:
 In order to gain mechanistic information of photoaddition reactions of 2-cyclohexenones,
the additions of 2- and 3-methyl-2-cyclohexenone and 2-cyclohexenone to bicyclo[2.2.1]hepta-2,5-diene have been studied. Substituted 2-cyclohexenone products are obtained in addition to cyclobutane derivatives, and it is proposed that the former adducts arise from diradical intermediates and intramolecular hydrogen shifts. The photo-rearrangement, of 4, 4-dimethyl-2-cyclohexenone, and its photocycloaddition to cyclopentene, was studied in order to identify the enone excited state responsible for cycloaddition. These results, and naphthalene quenching experiments, indicate that all of the additions studied proceed via triplet excited states.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Modelling Concurrent Systems with Object-Oriented Coloured Petri Nets

contributor:
Janicki, Ryszard
Computing and Software

subject: concurrent systems, object-oriented, coloured petri nets, network, modularity, class, inheritance, polymorphism

abstract:
 This thesis presents a new modelling technique for the complex current system. It
integrates object-oriented methodology into Petri Nets formalism.

 Petri Nets are used for modelling concurrent systems. They have natural graphical representation as well as formal specifications. They have been successfully used in various industrial applications. But with the development of distributed and network systems, their traditional weakness, namely their inadequate support for compositionality, is a big obstacle to their practical use for large, complex systems. To address this problem, we introduce the Object-Oriented Coloured Petri Nets (OO-CPN), which integrates the powerful modularity of an object-oriented paradigm into Petri Nets formalism. OO-CPN is based on Coloured Petri Nets and supports the concepts of
object, class, inheritance and polymorphism.

abstract: Thesis

abstract: Master of Science (MSc)


title: The Study in the Laboratory of Selenium Isotope Effects

contributor:
Thode, H. G.
Physics

subject: laboratory, selenium, isotope, sample, molecules

abstract:
The methods available for the calculation of ratios of partition functions for isotopic molecules were examined critically and compared. A number of calculations were made for carbon as well as for selenium systems using the exact method rather than an approximate
one. Improvements were made to the sample handling system of the mass spectrometer to prevent sample cross-contamination and to reduce the time needed for sample changeover. Four sets of experiments were performed. The kinetic isotope
effects in the reductions to Se° of Se^V1 and Se^1V were studied as were the isotope exchange reactions between Se° and Se^1V and between Se^1V and Se^V1. Estimates were made of the ratios of rate constants and isotope exchange equilibrium constants for 82Se and 76Se in these systems and these were compared with the theoretical values.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Flow of a Two-Layered Viscous Fluid Towards a Line Sink

contributor:
Huber, D. G.
Mechanical Engineering

subject: flow, two-layered, viscous fluid, line sink

abstract:
 The thesis contains an experimental verification of a paper by D. G. Huber dealing with a solution to the problem of the irrotational motion of two fluid strata towards a line sink. Friction was assumed negligible in the theoretical analysis and, as a result, the experimental values deviated somewhat from the theoretical expectations. The largest deviation occurred at the point of incipient drawdown where the theoretical and experimental values of the Froude number differed by 48%. The trends obtained in the experiment verify the theoretical
solution. The effect of viscosity at the point of incipient drawdown for two different interface height to width ratios was determined.

 The work of Harleman et al. in submerged sluice control was extended and showed that the Froude number of the lower layer at the point of incipient drawdown with high rates of flow was much larger than expected. The reason for the change was explained using the Khafagi-Hammad relationships.

abstract: Thesis

abstract: Master of Engineering (MEngr)


title: Coupled Ionic Diffusion in ulticomponent Silicate Glasses

contributor:
Lu, W-K.
Kirkaldy, J.S.
Metallurgy

abstract: Title: Coupled Ionic Diffusion in Multicomponent Silicate Glasses, Author: David A. Okongwu, Location: Thode

abstract:
A phenomenological scheme for ionic diffusion in multicomponent silicates based on self diffusion data and the Nernst-Planck equation has been formulated which is capable of predicting the concentration profiles of mobile ions in a diffusion couple with or without a fixed silicate anion
step discontinuity at the boundary. It is demonstrated that the diffusion potential appearing within this formalism is due entirely to a distribution of self-generated dipoles and equivalently, that the well-known contradiction between the electroneutrality constraint on real charges and the non-zero field predicted within the phenomenological formalism vanishes when it is recognized that the charge to be entered into Poisson's equation is the dipole charge.

The reported experimental diffusion profiles in K2O-SrO-SiO2 and Na2O-CaO-SiO2 glass couples have been compared with the predictions of the model and the agreement
has been found to be good. Diffusion couples in the K2O-CaO-SiO2 system were investigated by microprobe analysis and the resulting concentration profiles were also found to be in good agreement with predictions. It has been demonstrated that while the quasi-binary (i.e., immobile silicate anions) approximation is satisfactory for the K2O-SrO-SiO2 system at low temperatures, it is unsatisfactory for all other systems considered at low and high temperatures.

An extension of the phenomenological scheme to glass-metal diffusion couples with interfacial electrochemical
reactions is given in Appendix A.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


title: Transportation and Commercial Development in Pichincha Province, Ecuador

contributor:
Wood, Harold A.
Geography

subject: transportation, commercial, development

abstract:
Abstract Not Provided.
Thesis
Bachelor of Arts (BA)


title: Phase Measurements in Microwave Fields

contributor:
McLay, A. B.
Physics

subject: phase, measurements, microwave, fields, circuit

abstract:
 Two ways of measuring the relative phase in microwave fields are described in the second chapter of this thesis. The homodyne circuit is described in detail as this method was the one eventually used because of its high accuracy. Measurements were taken using a one inch
dielectric rod and these were compared with theoretical predictions as calculated by previous and present laboratory workers here. Conclusions and suggestions for further work are presented in the last chapter.

abstract: Thesis

abstract: Master of Science (MSc)


title: An Analysis of Dental Health in Relation to Sex and Social Status at Roman Winchester

contributor:
Brickley, Megan
Anthropology

subject:
bioarchaeology
dental health
intersectionality
inequalities
Roman Britain

abstract:
Inequalities in society, past and present, are influenced by a number of aspects of identity. The purpose of this study is to investigate dental health differences at a Romano-
British site as they relate to (1) sex, (2) social status, and the (3) confluence of sex and
social status, using the theoretical frameworks of Embodiment and Intersectionality.
Dental health data for 342 adults from Roman Winchester (4-5th century CE) were
compared between sex and social status groups. Statistical analyses showed that males
exhibited higher rates of anterior antemortem tooth loss (AMTL) and higher rates of dental
wear than females; additionally, the Lower Social Status group had higher rates of posterior
and total AMTL than the Higher Social Status group. When analyzing sex and social status,
the Higher Social Status group exhibited no statistically significant differences. Within the
Lower Social Status group, however, males and females exhibited differences in anterior
AMTL, anterior dental wear, and posterior dental wear. No differences in dental caries rates
were found for any subgroups.
Results show that in this skeletal sample, dental health between the sexes was not
drastically different, suggesting, at least with respect to diet, that women were not
fundamentally inferior to men, contrary to surviving literary evidence. By analyzing the
confluence of sex and social status, analysis shows that the Higher Social Status group was
defined by more equality between sexes, while minor differences were found in the Lower
Social Status group. This may suggest that in families where resources were strained, men
and women consumed slightly different diets, while in families where resources were
plentiful, women and men consumed similar foods.
The results of this thesis provide new insights into the lives of women and lower
social status groups, and contributes to a greater understanding of inequalities and dietary
variation in Roman Britain.

abstract: Thesis

abstract: Master of Arts (MA)


title: Minicomputer Control of a Latex Reactor

contributor:
Hamielec, A.E.
Wright, J.D.
Chemical Engineering

abstract: Title: Minicomputer Control of a Latex Reactor, Author: Stuart W. Ray, Location: Thode

abstract:
A minicomputer software and hardware system was developed to monitor and control the particle size growth in the emulsion polymerization of vinyl acetate. The basis of the on line detector was a UV spectrophotometer which measured turbidity as a function of wavelength .

A preliminary investigation was made to develop a technique for converting turbidity measurements into particle size distributions.

abstract: Thesis

abstract: Master of Engineering (ME)


title: Some Aspects of Text-To-Speech Conversion by Rules

contributor:
Rink, R. A.
Computation

subject: text-to-speech, conversion, rules, algorithms, TESCON

abstract:
 A critical survey of the important features and characteristics of some existing Text-to-Speech Conversion (TSC) system by rules is given. The necessary algorithms, not available for these systems in the literature, have been formulated providing the basic philosophies underlying these systems. A new algorithm TESCON for a TSC system by rules is developed
without implementation details. TESCON is primarily concerned with the preprocessing and linguistic analysis of an input text in English orthography. For the first time, the use of function-content word concepts is fully utilized to identify the potential head-words in phrases. Stress, duration modification and pause insertions are suggested as part of the rule schemes.
TESCON is general in nature and is fully compatible with a true TSC system.

abstract: Thesis

abstract: Master of Science (MSc)


contributor:
Smeltzer, W.W.
Metallurgy

abstract: Title: Decarburization of an Iron-0.8% Carbon Alloy in the Presence of a Wustile Scale, Author: Andrew S. Reeves, Location: Thode

abstract:
The kinetics of the oxidation and decarburization of an iron-0.8% carbon alloy in carbon dioxide at 950°C have been studied. Both processes are controlled by surface reactions. Decarburization through the
wustite scale has been studied by allowing oxide reduction by carbon to proceed under vacuum and in argon atmosphere . Oxide reduction is influenced both by surface reaction steps and by carbon diffusion in the metal. Transport of the gaseous reaction products through the scale is accomplished primarily by porosity in the oxide, with occasional evidence of mechanical failure of wustite. The effectiveness of the pores as a means of transport of carbon gases is dependent on the wustite scale thickness and a critical concentration of carbon at the metal-oxide interface.

abstract: Thesis

abstract: Master of Science (MS)


title: Compound Summation and Attenuation of Conditioned Suppression

contributor:
Black, A. H.
Psychology

subject: compound, summation, attenuation, conditioned suppression, properties

abstract:
 In six conditioned suppression experiments with rats, two conditioned stimuli (CSs) were individually trained and then tested as a compound. In one set of experiments, the suppressing effect of the compound was greater than that of either CS presented alone. This result is referred to as compound summation. In a second set of experiments, the suppressing effect of the compound was less than that of the "stronger" suppressing individual CS. This result is referred to as compound attenuation. The combination of summation and attenuation makes it possible to determine whether CSs with unknown properties are weakly excitatory
(i.e., weak suppressors) or inhibitory (i.e., conditioned characteristics that are opposite the excitatory suppressing effect). If an unknown CS is tested in compound with a second CS known to be excitatory, summation indicates that the unknown stimulus is excitatory, while
attenuation indicates that the unknown stimulus is inhibitory. In a final set of experiments, this compound test procedure was used to examine extinction and differential conditioning as inhibitory training procedures. Extensive extinction of a previously trained CS, even far beyond the point at which suppression vanished, was found to be an ineffective inhibitory training procedure. Rather, compound tests showed that the stimulus retained excitatory
properties. Differential conditioning was found to be a very effective inhibitory training procedure, regardless of whether presentations of a previously trained CS and shock, shook alone, or the previously trained CS - alone accompanied the unreinforced CS undergoing inhibitory conditioning. These findings are discussed in terms of current theories of conditioning and unresolved issues surrounding the acquisition and maintenance of inhibitory
properties.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Johnson, A.I.
Chemical Engineering

abstract: Title: MIMIC- A Study of the Technique and Application of Modelling of an Extraction Column, Author: Thomas H. Northcott, Location: Thode

abstract:
MIMIC, a digital analog simulator language is reviewed in some
detail. Part A of the report, which was written as a preliminary handbook
for the Chemical Engineering Department at McMaster University, deals
with a description and use of MIMIC, and several example problems are
given. Part B provides an example of the application of MIMIC to a
simulation problem which is, in this case, the transient response of
a liquid-liquid extraction column to step inputs in feed concentration.
An overall evaluation of MIMIC is made, and some of the shortcomings
and some of the features are outlined. For certain types of simulation
problems faced by the chemical engineer, MIMIC is a solution technique
which should be considered.

abstract: Thesis

abstract: Master of Engineering (ME)


contributor:
Clifford, P.M.
Geology

abstract: Title: An Experimental Investigation into the Influence of Environmental and Fabric Parameters on the Behaviour of Sandstones, Author: Roger J. Rector, Location: Thode

abstract:
An experimental study has been carried out to determine the effects of environmental and fabric parameters on the deformational behaviour of sandstones. Confining pressures ranged from 1-2500 bars, total strains 0.5-20.0 percent, and strain rates 10^-5 - 10^-7 per second.

The modes of deformation are found to be strongly dependent
on confining pressure, total strain, and composition. All rocks tested
show the customary increase in strength with increasing confining
pressure. The ultimate strength is found to be inversely proportional
to the mean grain size of the framework, and calcite content. Unconfined
compressive strengths and elastic properties are strongly dependent
on porosity. Ductility is enhanced by increasing calcite content and
increasing confining pressure, but is not influenced by clast variation
in the framework.

The deformational mechanisms are shown to be functions of the rock's fabric and confining pressure. Extensional microfracturing in the quartz grains of a calcareous sandstone and an
arenaceous carbonate are controlled by the Poisson's ratio of quartz
and calcite, and the volume fraction of the quartz grains.

abstract: Thesis

abstract: Doctor of Philosophy (PhD)


contributor:
Lock, C.J.L.
Chemistry

abstract: Title: An Investigation of the Crystal Structure of dichloro-μ-tetra(n-butyrato)dirhenium(III), Author: Roderic J. Restivo, Location: Thode

abstract:
Dichloro-μ-tetra(n-butyrato)dirhenium(III) was examined by x-rays and found to consist of a centrosymmetric dimeric unit in an eclipsed rotomeric configuration with a short rhenium-rhenium bond length of 2.20(2)Å. A long rhenium-chlorine bond 2.53(1)Å is present in the molecular unit.

The bonding in Re2(O2C.C3H7-N)4CL2 is discussed with reference to similar carboxylate dimer structures.

A preliminary report on the structure of Re2(O4C.C3H7-N)2 is also presented.

abstract: Thesis

abstract: Master of Science (MS)


contributor:
Kramer, J.R.
Geology

abstract: Title: A Chemostatic Study of the Assimilation of Nutrients by Chlamydomonus rugosa at Various Nitrogen to Phosphorus Concentration Ratios, Author: Philip D. Rice, Location: Thode

abstract: Chlamydomonus rugosa does not readily grow when transferred to a medium of different concentrations of elements unless N and P are in high concentrations. Chemostat reactors should be accessible from the top to facilitate the experimental procedure. A G. E. exposure meter (model 8DW58Y4) can be used to estimate light intensity. One foot candle registered on the meter, when the lid is closed, is equivalent to 1.13 x 10^10 ergs/m^2/hr.

abstract: Thesis

abstract: Bachelor of Science (BSc)


title: Development and Application of Synthetic Methods for the Production of Small Molecule Libraries

contributor:
Capretta, Alfredo
Chemistry and Chemical Biology

subject: Kyle Leckett

abstract:
The synthesis of chemical libraries is a fundamental tool used to identify molecules with
desirable biological activity. Recent developments in combinatorial synthesis techniques have
allowed for the rapid generation of very large and diverse chemical libraries that can be used in
conjunction with high-throughput screening (HTS) technology to identify lead molecules that
can be potentially developed into pharmaceuticals. Libraries based around an oxindole scaffold
(previously identified as inhibitors of cRAf1 kinase) were recently shown to display inhibitory
effects against aminoglycoside phosphotransferases (APH) enzymes found in bacteria
responsible for antibiotic resistance to aminoglycosides. Additionally, substituted quinazolines
(similar in structure to the known drug Lapatinib) were identified as a potent inhibitor of both
APH(2”)Id and ANT(2”). The present thesis involves the development of synthetic protocols
suitable for the generation and subsequent biotesting of chemical libraries based around these
hits in order to determine the pharmacophore in each case.

abstract: Thesis

abstract: Master of Science (MSc)


title: A comparative study of Quebec English-Speaking and Franco-Ontarian postsecondary students' linguistic identity, boundary work and social status

title: Linguistic identity, boundary work and social status

type: Map Thesis

contributor:
Davies, Scott
Sociology

subject:
official language minority communities
identity
culture
social status
Quebec
Ontario
linguistic minority
language
higher education
postsecondary education
Franco-Ontarian
Quebec English-Speaker
Francophone
Anglophone
Official Languages Act
Official Bilngualism

abstract: Dissertation based on a comparative qualitative study of Franco-Ontarian and Quebec English-speaking postsecondary students.

abstract: Kymlicka (2007) identifies three diversity silos in Canada: Indigenous peoples, official bilingualism, and multiculturalism encompassing immigrants and ethnic groups. This dissertation falls within the official bilingualism silo and explores linguistic identity, boundary work and social status amongst Franco-Ontarian and Quebec English-Speaking postsecondary students. Using a qualitative approach, semi-structured interviews were conducted in Montreal, Ottawa and Toronto between January and June 2014 with 36 participants in English and French. First, this dissertation investigates how Franco-Ontarian and Quebec English-Speaking postsecondary students choose to self- identify, define, and enact their linguistic identity. Second, many questions aim to gauge potential symbolic linguistic boundaries, their porosity, and the role of bilingualism. Third, this dissertation delves into participants’ experiences of discrimination based on language or linguicism. Fourth, this inquiry examines if: a) the participants believe that bilingualism is highly esteemed and respected as a social status, b) if they believe that language is a commodity, c) and independently of their belief, if bilingualism results in a cosmopolitan lifestyle. Certain themes permeate all the chapters. Franco-Ontarian postsecondary students experience linguistic insecurity and express concerns for the future of French in their communities. While Quebec English-speaking postsecondary students do not voice fear for the future of the English language, they reveal a deep desire to be recognized as belonging in Quebec society. Some policy implications are discussed in the conclusion.

abstract: Dissertation

abstract: Doctor of Philosophy (PhD)

abstract: Francophones outside of Quebec and Quebec Anglophones are official language minorities with rights enshrined in the 1985 revised Official Languages Act. Their postsecondary experiences are less studied than their elementary and high school pathways. This dissertation summarizes the results of a study about the beliefs, attitudes and thoughts of Franco-Ontarian and Quebec English-Speaking postsecondary students about their linguistic identity, culture, their education, and the role of bilingualism in their lives. In order to do so, interviews were completed in Montreal, Ottawa and Toronto with CEGEP, college and university students or recent graduates between January and June 2014 with a total of 36 participants. The results indicate that historical linguistic conflicts and the contemporary political context influence the responses of each group. The interviews also reveal that Quebec English-speaking participants want to be fully accepted as Quebecers while Franco-Ontarian participants worry for the future of their communities.