1,668 Works

Lillooet phonology, texts and dictionary

Leo John Swoboda
The reasons for writing North American Indian stories and legends are both numerous and obvious, especially in light of the fact that many Indian languages, which hitherto have orally preserved such material, are dying due to many complex, socioeconomic factors. Less obvious is the manner in which such material should be preserved; however, few would dispute that to do so by ignoring the source language would be to ignore a fundamental means of transcending the...

Functional dynamic spect imaging using a single slow camera rotation

Troy Farncombe
Dynamic single photon emission computed tomography (SPECT) is a relatively new imaging method that uses radioactive tracers and tomographic data acquisition techniques in order to quantify temporal changes in regional radiotracer concentrations within a patient. This is important as the rate of change in tracer concentration within an organ often can be related to the functional ability of that organ. In this work, a new method is presented that is able to determine these kinetic...

The integration of housing and economic activites: a case study of low-income settlements in Kumasi, Ghana

Samuel K. Afrane
This dissertation is concerned with the appropriateness of the conventional urban land use segregation concept which separates people's residence from their place of work. The empirical research is focused on the creative processes by which households in four low income settlements in Kumasi, the second largest city in Ghana, integrate their economic survival strategies into the design and use of their housing. The study analyses the extent to which income, settlement type (i.e., informal or...

Life history of marine threespine stickleback in Oyster Lagoon, British Columbia

Regina Karin Saimoto
Marine populations of three spine sticklebacks (Gasterosteus aculeatus) are possible ancestors of the many of the divergent freshwater populations of this species found along the glaciated coast of British Columbia. Until this study, the life history and reproductive behaviours of marine population along the Pacific coast of North America were unknown. Data was collected from September 1990 to August 1992 at Oyster Lagoon, Pender Harbour, British Columbia. Morphology, migration and growth, reproduction, and nesting success...

Risk prediction models for binary response variables for the coronary bypass operation

Hongbin Zhang
The ability to predict 30 day operative mortality and complications following coronary artery bypass surgery in the individual patient has important implications clinically and for the design of clinical trials. This thesis focuses on setting up risk stratification algorithms. Utilizing the binary feature of the response variables, logistic regression analyses and classification trees (recursive partitioning) were used with the variables identified by the Health Data Research Institute in Portland, Oregon. The data set contains records...

Effects of headings on the written recall and organization of expository text in grades 5 through 10 with emphasis on grades 7 and 8

Cynthia Marilyn King
This study investigated the effects of headings and text organization on grade 5 through 10 students' written recall of expository prose passages written in a classification/description mode. Emphasis was placed on the results from students in grades 7 and 8. This study was a component of a three part study. The other two parallel studies emphasized grades 5 and 6 (Stables, 1985) and 9 and 10 (Gibbs, 1985). Each subject read and recalled two passages:...

Tailed frogs (Ascaphus truei, Stejneger) in natural and managed coastal temperate rainforests of southwestern British Columbia, Canada

Tanya Rhoda Wahbe
Ten headwater creeks were surveyed for tailed frog tadpoles in the summers of 1994 and 1995 to assess possible effects of timber harvest on their population density and structure. Three watersheds were selected to replicate three treatments: old-growth (250+yrs), mature second growth (60-80yrs) and young clearcut (~5yrs). One buffered clearcut creek was located and sampled but not replicated. Creek and site characteristics modified the response forest harvest had on tailed frog tadpole populations. Effects on...

Old-growth forests for wilderness preservation and timber production in British Columbia: a goal programming model

Sen Wang
The B.C. government’s Protected Areas Strategy (PAS), aimed at protecting 12 per cent of the province’s land base, will affect the old-growth forests considerably. Based on the Valhalla proposal, at least 0.65 million hectares of old growth will need to be set aside as wilderness. Given the nature of multiple uses of the old growth, a Goal Programming approach is appropriate for the assessment of the preservation plan. For model construction, six goal items have...

The Tsai-Wu strength theory for Douglas-fir laminated veneer

Peggi Clouston
This study investigates the determincrtion and use of a multi-axial failure criterion for Douglas-fir lcrrninated veneer. Unlike previous studies on failure theories, this study treats strength parameters as random variables as opposed to detenninistic variables. Also, size effect has been incorporated in the failure theory implementation. A comparison has been made between four established orthotopic failure theories based on off-axis tensile test data to determine the most appropriate theory of the four considered; Tscd-Hill, Norris,...

A structured covariance model for Douglas-fir PSP data and some implications for sampling

S. Northway
The error structure resulting from the repeated measurements of permanent sample plots (PSPs) can be addressed using a general linear model. Maximum likelihood methods provide a unified approach for estimating the parameters and subsequent inferences. Utilizing a predicted error structure, the efficiency of proposed PSP sampling schemes can be compared, prior to sampling. This can be done because the sampling errors of the model parameters are independent of the dependent variable. A sampling scheme is...

Dielectric characteristics of two BC coastal species during radio frequency heating

Bingning Zhou
The purpose of this study was to evaluate the dielectric properties (loss factor) of two British Columbian softwoods (western hemlock [Tsuga heterophylla (Raf.) Sarg.] and western red cedar [Thuja plicata Donn]) at different moisture content, temperature, and electric field strength levels. This study is expected to provide useful information for the development of a mathematical model to describe heat and moisture transfer mechanisms in wood during radio frequency/vacuum (RF/V) drying. Such a model would predict...

Intermittent hypoxia : activation of the sympathetic nervous system

Sarah-Jane C. Lusina
BACKGROUND: Individuals with obstructive sleep apnea (OSA) are reported to have elevated muscle sympathetic nerve activity (MSNA). In this complicated pathological condition numerous factors can be implicated in the elevated sympathetic activity; however periodic exposures to hypoxia appear to be the primary cause. In laboratory interventions with healthy humans, it is well documented that acute hypoxia increases MSNA, which persists after removal of the hypoxic stimulus. The effect of long term exposure of to intermittent...

The experience of culture conflict in second-generation Indo-Canadian women

Sukhi Sohi
The purpose of this study was to explore the experience of culture conflict in second-generation Indo-Canadian women. An existential-phenomenological approach was used to gain an understanding of culture conflict from the perspective of those who have experienced it. Five second-generation Indo-Canadian women participated in this study. The participants took part in an in depth, unstructured interview in which they were asked to describe their experience of culture conflict. The interview was taped and transcribed. The...

The Detection of alpha particles with superconducting tunnel junctions

Gordon Harvey Wood
A superconducting thin film tunnel junction (Sn-Sn0₂ -Sn) of total thickness 4000 Å, area 7 x 10ˉ⁴ cm² and normal (4.2 K) resistance 77 mΩ was prepared on a glass substrate. When cooled to 1.2 K the junction was biased at 0.3 mV where, the Josephson supercurrent having been suppressed with a magnetic field, the junction dynamic resistance had its maximum value of 9.3Ω . The junction was then bombarded with 5.1 MeV alpha particles...

Isotope effect on the Neel temperature of hydrated manganese chloride crystals

Chung Leung Yue
The Néel temperatures of both the hydrated and 96% deuterated single crystal specimen of antiferromagnetic manganese chloride, have been compared. The sample was placed in the tank circuit of a radio-frequency oscillator; the inductance of the coil and hence the frequency of oscillation thus depended on the susceptibility of the specimen. As the crystal in the liquid helium bath was warmed through the Neel temperature, the oscillation frequency was monitored by a frequency counter. By...

An EPR study of order and molecular orientation in liquid crystals

Alexander Lloyd MacKay
Using EPR, the temperature dependence of the effective order parameter of the molecule vanadyl acetylacetonate in the nematic liquid crystal 4-methoxy benzylidene-n-butyl aniline was studied. In the resulting data, a discontinuity in slope of the curve of effective order parameter versus temperature was found, indicating a change to a more restricted type of motion at lower temperatures. Similar results were obtained from NMR T₁ measurements on the pure liquid crystal. The discontinuity cannot be interpreted...

Intense bedload transport in non-uniform flow

Yonas Kinfu Paulos
A theoretical and experimental investigation of intense bedload transport in non-uniform flow has been carried out. The study includes the process of shear stress transfer from fluid to carpet; the effect of convective acceleration induced pressure field on the carpet flow; efficiency factor of intense bedload transport; the profiles of sediment and fluid velocities; and frictional behavior of carpet flow. The theoretical study considers two aspects of carpet flow: The first deals with the dynamics...

Response of a pile restrained floating breakwater

Brenda Manuel
Experimental work has been performed to assess the behaviour of a caisson-type floating breakwater restrained by adjacent vertical piles. A series of two-dimensional simulations were executed evaluating the effectiveness of the breakwater as it was subjected to various incident wave trains. The transmission coefficient was of primary interest, although the reflection coefficient, energy dissipation coefficient, and heave response amplitude operator were also evaluated from the experimental results. Two numerical models were used to estimate the...

A biomechanical investigation of blood flow occlusion achieved with the use of surgical pneumatic tourniquets

Martine Breault
The use of the modern pneumatic surgical tourniquet has greatly facilitated orthopaedic limb surgery since its introduction. Overly high inflation pressures and improper application procedures have, however, resulted in occasional cutaneous, vascular and neuromuscular injuries. The present research models the mechanism of blood flow occlusion produced by a pneumatic cuff to determine safer inflation pressures and efficacious application procedures. A computerized data acquisition system using a biomedical pneumatic pressure sensor was utilized to measure surface...

Network-enabled monitoring and stable control of dynamic systems

Poi Loon Tang
The integration of computers, communication, and control in modern distributed systems such as intelligent transit systems and industrial facilities has garnered a great deal of attention in recent years. This thesis presents an investigation into basic research, technology development, and implementation of monitoring and control strategies for networked-enabled dynamical systems. In view of the hierarchical nature of these systems, the thesis focuses on two important system layers; namely, networked control systems within the direct-control (servo)...

Analytical and finite element solutions for an elastic matrix with two-dimensional nanoscale inhomogeneities

Lian Tian
A new frontier of research at the interface of material science and mechanics of solids has emerged with the current focus on the development of nanomaterials such as nanotubes, nanowires and nanoparticles. As the dimensions of a structure approach the nanoscale, its properties can be size-dependent. The classical continuum theory, however, does not admit an intrinsic size, and is not applicable to the analysis of nanoscale materials and structures. Mechanics of nanomaterials-based composites can be...

Pharmacological blockade of the cardiovascular dive response : effects on heart rate and diving behaviour in the harbour seal (Phoca vitulina)

Nicole M. Elliott
While diving, harbour seals (Phoca vitulina) manage their oxygen stores through cardiovascular adjustments including bradycardia, a concurrent reduction in cardiac output, and peripheral vasoconstriction. At the surface, post-dive tachycardia facilitates rapid reloading of these oxygen stores. Although harbour seals can tolerate over 20 min of submergence, the majority of their natural dives are only 2 to 6 min and are usually followed by surface intervals that are less than 1 min, so they spend about...

Regulation of immunoproteasome expression by human brain endothelium : functional significance in MHC class I expression and CD8+ T cell adhesion to the cerebral endothelium

Henry H. W. Lau
Brain inflammatory diseases are characterized by the entry of blood-borne leukocytes into the brain across the blood-brain barrier (BBB) that normally restricts their entry into the central nervous system. Recent studies indicate that infiltrating brain antigen-specific CD8+ T cells clonally expand in multiple sclerosis (MS) lesions. Previous studies from this laboratory showed that cytokines induce human brain microvessel endothelial cells (HBMEC) to express or upregulate several endothelial cell adhesion molecules (ICAM -1, VCAM-1, PECAM-1 and...

Protein tyrosine phosphatase PRL-3 expression and transcriptional regulation in cancer and metastasis

Patrick Chun Wei Wong
Elevated expression of protein tyrosine phosphatase PRL-3 is implicated in cell migration, invasion, and metastasis, although the molecular targets of this phosphatase remain unidentified. PRL-3 expression is strikingly upregulated in metastatic colon carcinoma, compared with much lower expression in primary colon tumours and virtually undetectable expression in normal colon epithelia. Increased transcriptional activity is suggested to account for increased PRL-3 expression in 75% of the metastatic samples. We used bioinformatics analyses and cell-based promoter assays...

Comparison of computer-based terrain storage methods with respect to the evaluation of certain geomorphometric measures

David Michael Mark
Topographic information can be digitized in several ways. Sampling may be surface-random (points selected according to partially or completely arbitrary criteria) or surface-specific (points selected according to their topographic significance). Surface-random sampling includes grids, contours, and randomly-located points. In this study, grid sampling and surface-specific sampling are compared. Surface behavior between sampled points is assumed to be linear. All aspects of surface form can be considered to reflect surface roughness. Horizontal variation includes the concepts...

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