identifier: Hustins, Kathryn Ann Corkery <https://research.library.mun.ca/view/creator_az/Hustins=3AKathryn_Ann_Corkery=3A=3A.html>   (1986) Psychological distress and social support in bereavement: a nursing investigation of middle aged Newfoundland widows.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this investigation is to describe a sample of middle-aged -Newfoundland widows and to determine the nature of a relationship between psychological distress and social support during the first year of bereavement. The sample is 30 women aged 45-64 whose husbands had died within a seven month period. During the first year of bereavement, two interviews are conducted. -- Psychological distress is measured using the 30 item Goldberg General Health Questionnaire. A score of 5 or more is taken to indicate psychological distress. The women's psychological distress scores decrease from Interview I (x̄ 6.4) to Interview II (x̄ 2.6). Three groups of women are identified at the end of the first year of bereavement: those women r who report high psychological distress scores throughout the first year of bereavement (n = 4), those women who report low psychological distress scores throughout the first year of bereavement (n = 14), and those women who have initial high psychological distress scores which decrease to low psychological distress scores by the end of the first year of bereavement (n = 11). -- Two dimensions of social support, perceived social support network and perceived functional social support, are measured using the Norbeck Social Support Questionnaire. The scores on perceived social support network increase from Interview I (x̄ 124.27) to Interview II (x̄ 130.50). The scores on perceived functional social support also increase from Interview I (x̄ 235.90) to Interview II (x̄ 251.90). There is a positive significant between perceived social support functional social support at each statistical correlation network and perceived interview and between interviews. There is no significant statistical correlations between psychological distress and social support during the first year of bereavement. The women in the sample identify family and friends as their main sources of social support. -- The author constructed Widow Interview Guides (I and II) provides a description of the background and personal characteristics, the physical and psychological health characteristics and the social  characteristics of the widow and a description of the widow's perceptions of the first year of bereavement and ·the problems and difficulties she encounters. The women in the sample state that loneliness is their most serious problem. Many of the women report difficulty with sleeping, and for some of the women this continues throughout the first year of bereavement. -- Case studies integrate some of the major findings and provide a comprehensive view of the Newfoundland widow's first year of bereavement. Recommendations for nursing practice, research and theory are presented.


identifier: Hustins, Sarah. <https://research.library.mun.ca/view/creator_az/Hustins=3ASarah=2E=3A=3A.html>   (2006) Mosquito ecology in relation to land-use changes and potential West Nile virus in Newfoundland.  Masters thesis, Memorial University of Newfoundland.

type: Thesis NonPeerReviewed

abstract: The last extensive mosquito survey of insular Newfoundland was carried out in the early 1980s. Increased urban and agricultural development have locally increased the productivity of mosquito habitats and thus provided opportunity for colonization by additional species. The recent introduction of West Nile virus to North America and changing local climate has prompted renewed research on mosquitoes and the impact of human activity on them in Newfoundland. The research objective was to redefine species composition and evaluate the impact of land-use on mosquitoes. Data were obtained by a survey of three cities and two agricultural areas as well as natural habitat using a standard dip method for larvae and CO₂ baited miniature light traps for adults. A horse serum survey was performed to detect the presence of the virus through ELISA antibody screening, in addition to the National corvid surveillance program serving as an indicator for virus activity. Three additional mosquito species were recorded, including Culex pipiens L. (Diptera: Culicidae). The research provided the data needed to estimate the level of risk for human and animal exposure to West Nile virus. Such information will be essential if the risk of vectored disease transmission increases due to enhanced mosquito breeding seasons.


identifier: Hynes, Douglas P. <https://research.library.mun.ca/view/creator_az/Hynes=3ADouglas_P=2E=3A=3A.html>   (2013) A bioacoustic analysis of red crossbill (Loxia curvirostra) vocalizations from the island of Newfoundland, Canada.  Masters thesis, Memorial University of Newfoundland.

abstract: On the basis of morphological, ecological, genetic and vocal differences, North America Red Crossbills (Loxia curvirostra) have been described as a cryptic sibling species complex consisting of at least 10 forms. These forms are most easily differentiated via spectrographic analysis of their vocalizations and are hence known as "vocal types." However, little quantitative work has been done on forms' repertoires. For example, it is unclear if vocalizations, such as those named "excitement calls" or "chitter" by others, vary acoustically depending on the social context in which they are used or the physical state of the caller; it is also not known if such calls have characteristics that are systematically informative. Further, little is known about the vocal behaviour of Red Crossbills on the island of Newfoundland, an island which is generally presumed to contain the endangered Red Crossbill subspecies, L. c. percna. I made field recordings 1000 minutes) of Red Crossbills at 10 sites on the island in order to describe and document structural and contextual variation in vocalizations and to determine categories of calls (Call Classes) that might contain systematic information useful for subsequent comparative analyses. Subjectively classified calls, made on the basis of the social, behavioural, and physical contexts of calling birds, audible qualities of calls, and general appearance of spectrograms, corresponded closely to those of crossbills (Loxia spp.) described elsewhere in North America and Europe. Ln total, adults uttered five Call Classes (I- HI, V and VI); juveniles uttered two (IV and V). Both adult males and juveniles of unknown sex also sang. Multivariate clustering of calls, based on the individual averages of 10 acoustic variables measured from 1186 calls, corresponded with the subjectively established Call Classes. Acoustic variability within individuals and across contexts was relatively low among Call Classes I and III. Call Class Il was the most individualistic. A discriminant analysis (DA) on acoustic variables of Class I calls from Newfoundland individuals (n = 83) and individuals of vocal types from elsewhere in North America and Europe (n = 31) classified 89% of birds to the correct vocal type; 98% of birds from Newfoundland were differentiated successfully by DA. Further, many birds from Newfoundland also emitted Class III calls and song motifs that were distinct. Visual examination of Class I spectrograms, including those individuals misclassified by DA, confirmed that seven individuals from Newfoundland were spectrographically and audibly more similar to vocal types 2 and 10, which have been described previously on mainland North America. Thus, the results of this study show that multiple Red Crossbill forms, including possibly L. c. percna, are present on the island of Newfoundland.


identifier: Ibrahim, Mohamed Darwish <https://research.library.mun.ca/view/creator_az/Ibrahim=3AMohamed_Darwish=3A=3A.html>   (2011) Integration of real time and satellite water quality monitoring systems: case study Lake Manzalah, Egypt.  Masters thesis, Memorial University of Newfoundland.

abstract: Water quality monitoring is one of the corner stones of water resources management. Monitoring water quality using a Real Time Water Quality (RTWQ) monitoring approach provides high temporal resolution measurements, while monitoring through the use of satellite imagery produced high spatial resolution maps for the monitored water parameters. By combining approaches, RTWQ and satellite, high temporal and spatial resolution products can be obtained. The integration was done through developing statistical relationships between the extracted reflectances from the satellite imagery and measured real time water quality parameters in the field. -- Lake Manzalah, the largest of the northern lakes in Egypt, was used as a case study for the proposed combined approach. The water quality parameters investigated were Turbidity (TUR), Chlorophyll-a (CHL), and Total Dissolved Solid (TDS). The results showed that there were statistically significant regression relationships between the satellite reflectance and the measured water quality parameters with r² = 0.77, n= 34; 0.65, n= 33; and 0.60, n- 56 for TUR, CHL, and TDS models, respectively. The corresponding Nash-Sutcliffe coefficients were 0.76, 0.64, and 0.61 for TUR, CHL, and TDS models, respectively. The results indicate the viability of using satellite reflectances to infer the state of the water quality in Lake Manzalah. The relationship between RTWQ measurements and satellite observations were subsequently used to generate other useful quantitative water quality products. This research has the potential for application to other large water bodies in Newfoundland and Labrador and internationally.


identifier: Iftekharuzzaman, Md <https://research.library.mun.ca/view/creator_az/Iftekharuzzaman=3AMd=3A=3A.html>   (2013) Finite element modeling of steel piles and suction caissons in sand under lateral and inclined load.  Masters thesis, Memorial University of Newfoundland.

abstract: The behavior of a steel pipe pile in sand subjected to lateral load is examined by three-dimensional finite element (FE) analyses using the commercially available software package ABAQUS/Standard 6.10 EF1. The sand around the pile is modeled using a modified form of Mohr-Coulomb soil model. The modifications involve the nonlinear variation of elastic soil modulus with mean stress and the variation of mobilized angle of internal friction and dilation angle with plastic shear strain, which are implemented in ABAQUS/Standard using a user subroutine. Numerical analyses are also performed by using the LPILE software which is based on the p-y curve approach and widely used in design for estimating lateral load capacity of pile foundations. The FE and LPILE results are compared with the results of two full-scale tests available in the literature. It is shown that the FE model better simulates the response of a pile under lateral load. Comparing the numerical results with the full-scale test results, some limitations of the p-y curve method are highlighted. -- In the second part of the study, finite element analyses are performed to estimate the pullout capacity of a suction caisson subjected to oblique loading. Three-dimensional finite element analyses are performed using ABAQUS/Standard 6.10 EF1 finite element software. The effects of two key variables, loading angle and mooring line position, are investigated. The finite element results are compared with centrifuge test results available in the literature. The maximum pullout capacity is obtained when the mooring line is attached at approximately 75% depth of the caisson for the cases analyzed in this study.


identifier: Ige, Tolulope Oluwasomo <https://research.library.mun.ca/view/creator_az/Ige=3ATolulope_Oluwasomo=3A=3A.html>   (2012) Cold adaptation of Atlantic salmon tropomyosin: role of residue '77'.  Masters thesis, Memorial University of Newfoundland.

abstract: Tropomyosin from the fast skeletal (trunk) muscle of Atlantic salmon (Salmo salar) is an alpha-type isoform. It shares ~93% identity with a counterpart from rabbit skeletal muscle (20 amino acid substitutions out of a total of 284) but is less thermally stable. -- An interesting aspect of the small heterogeneity is the replacement of lysine-77 in rabbit with threonine in salmon. In the case of the mammalian protein, the lysine in question is positioned to form ion pairs with aspartate-80 in the next turn of the same helix and also with glutamate 82 in the opposing helix of the coiled coil. Thus, at neutral pH, salmon tropomyosin loses two potential charge-charge (ion pair) interactions. The contribution of residue-77 to the properties of salmon tropomyosin has been investigated by mutating it to the amino acid in rabbit using site directed mutagenesis, followed by circular dichroism, differential scanning calorimetry, affinity chromatography and limited proteolysis. A major finding of this research is that threonine in the 77th position of salmon tropomyosin is destabilizing compared to lysine in the same position. Reducing the number of ion pairs is concluded to be part of the structural means by which tropomyosin, and possibly other rod-shaped proteins, adapt to low temperature. The specific details are outlined below in point form: -- 1. Atlantic salmon fast skeletal muscle alpha-tropomyosin cDNA was mutated to replace the threonine at position 77 with lysine using the QuickChange Lightning site directed mutagenesis kit. The mutation was confirmed by DNA sequencing. -- 2. Mutated and non mutated recombinant tropomyosins were obtained by expression in E. coli BL21 cells and chromatographically isolated. -- 3. The mutant salmon tropomyosin, containing Lys-77, exhibited a faster electrophoretic mobility than the non-mutant (Thr-77), in the presence of the detergent sodium dodecyl sulfate, which is attributable to a difference in detergent binding due to the extra charge. This electrophoretic shift was useful in the identification of amino-terminal peptides (see below, #7). -- 4. Far-UV circular dichroism was used to investigate the conformational stability of the recombinant salmon tropomyosins (ionic strength 0.1 M, +DTT, pH 7.0). The observed melting temperatures of the mutant (~45°C) and non mutant (~40°C) recombinant proteins differ by approximately 5°C. -- 5.  Differential scanning calorimetry was employed to monitor the thermal unfolding of non mutant and mutant recombinant tropomyosin (ionic strength 0.1 M, +DTT, pH 7.0) by direct heating. The observed melting temperatures of the mutant (~44°C) and non mutant (~40.5°C) protein differ by approximately 4°C. -- 6. In an affinity chromatography experiment mutant tropomyosin bound more strongly to troponin-Sepharose 4B than the non mutant. -- 7. The time-course of limited chymotryptic or tryptic digestion (T, 25°C) was monitored by SDS PAGE and found to be similar for mutant and non-mutant tropomyosins. Edman-based sequencing showed that the initial chymotryptic cleavage site in salmon recombinant tropomyosin (both mutant and non-mutant) is between Leu-11 and Lys-12. The second chymotryptic site is between Leu-169 and Val-170 which corresponds to the preferred site reported previously in rabbit alpha-tropomyosin.


identifier: Igene, Harrison Akhaze <https://research.library.mun.ca/view/creator_az/Igene=3AHarrison_Akhaze=3A=3A.html>   (2013) Polysulfides: synthesis and analysis.  Masters thesis, Memorial University of Newfoundland.

title: Polysulfides: synthesis and analysis

abstract: Polysulfides of the general form ⁻SSπS⁻ occur naturally in sulfur rich waters and can be formed by the reaction of sulfide with elemental sulfur to yield water soluble polysulfides. Inorganic polysulfides have been found to form organic polysulfanes in the environment, and in water, oxidation of polysulfides can produce thiosalts and sulfuric acid, resulting in acidification of aquatic environments. Polysulfides are unstable and readily undergo changes in speciation, analysis is challenging and complicated by lack of standards. A series of polysulfides were synthesized to be used as standards. They were stabilized by methylation to form dimethylpolysulfanes and analyzed by gas chromatography-mass spectrometry (GC-MS), high performance liquid chromatography (HPLC) with UV detection, and matrix assisted laser desorption MS (MALDI-MS). The various dimethylpolysulfanes were fractionated using semi-preparatory HPLC; the fractions containing individual dimethylpolysulfanes were analyzed for sulfur content by inductively coupled plasma-optical emission spectrophotometry (ICP-OES). Stability studies were also carried out to confirm that the stabilization approach was effective.


identifier: Ikpo, Nduka <https://research.library.mun.ca/view/creator_az/Ikpo=3ANduka=3A=3A.html>   (2012) Synthesis, characterization and reactivity of amine-phenolate complexes towards the preparation of aliphatic polyesters.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Biodegradable polymers such as poly(ε-caprolactone) (PCL), polylactide (PLA) and polycarbonate (PC) are important materials m commodity, biomedical and pharmaceutical applications. This is due to their biodegradable, biocompatible and permeable properties, and the fact that the monomers can be sourced from annually renewable feedstocks. One of the most important methods in producing these polymers is ring-opening polymerization (ROP) initiated by metal complexes. -- Many metal complexes are effective initiators for the ROP of small ring monomers; however, some undergo side reactions during polymerization that lead to low molecular weight polymers and decrease the level of control in polymer formation. Ligand design and catalyst design using main group and early transition metals have played a vital role in the development of this area. In view of this, Li, Zn, AI, Ti, and Zr complexes bearing various N-, and O-mixed donor monoanionic piperazinyl- and morpholinyl-based phenolate ligands were synthesized in this project. The complexes were fully characterized by elemental analysis, NMR spectroscopy, and X-ray crystallography. In addition, using Brookhart's acid, cationic zinc complex was synthesized and characterized using ¹H, ¹³C, 1 ¹⁹F and ¹¹B NMR spectroscopy. -- The ROP reactions of rac-LA and ε-CL using Zn alkyl and alkoxide complexes were performed. Data showed that polymerization occured immediately using the alkoxide complexes; however, for the alkyl complexes, polymerization was possible only in the presence of alcohol. In addition, microwave irradiation (MW) was found to reduce reaction time significantly while maintaining control of the polymerization reaction. -- Furthermore, the AI and Li complexes are active for the ROP of ε-CL in the presence of benzyl alcohol (BnOH), while the Li complexes are also active in the absence of BnOH. Polymerization kinetics were monitored by observing the degree of conversion of ε-CL to PCL by ¹H NMR spectroscopy. The observed rates and activation energies are related to the steric effects and the outersphere substituents of the complexes. The polymers were analyzed by GPC, MALDI-TOF MS, DSC and TGA. Preliminary investigations into the copolymerization of epoxides with CO₂ using Zn and Al complexes were promising; however, further experiments are required to optimize the reaction method.


identifier: Indermohan, Harikrishnan <https://research.library.mun.ca/view/creator_az/Indermohan=3AHarikrishnan=3A=3A.html>   (2006) Variational principles based methods for integrity assessments.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The assessment of load carrying capacity under applied loads is an important goal in designing mechanical components and structures. Limit analysis is carried out to determine the load at which uncontained plastic flow occurs in the component under consideration. Lower bound limit loads are vital from the structural integrity standpoint and are germane to fitness-for-service assessments. -- The existing lower bound limit load determination methods using elastic modulus adjustment procedures (EMAP) such as the classical and mα-multiplier methods have a dependence on the maximum equivalent stress. These methods are therefore sensitive to localized plastic action, which occurs in components with thin or slender construction, or those containing notches and cracks. The lower bounds obtained using the present methods have an oscillatory behavior during successive elastic iterations. -- The mβ-multiplier method developed in this thesis is obtained by considering a distribution of stress rather than a single maximum equivalent stress. As a result, good limit load estimates can be obtained especially for shape-sensitive structures and components with cracks and notches. -- The applicability of the m fJ -multiplier method is extended such that the method can determine limit loads of pressure components exhibiting anisotropy. As a result, collapse load analysis can be performed for perforated heat exchanger tubesheet that is currently modeled as an equivalent solid plate with anisotropic properties. -- Simplified procedures for fitness-for-service assessment, suitable for use by plant engineers, is also developed. A variational formulation in plasticity is used to develop these procedures. The concept of "integral mean of yield" is utilized to problems involving locally thinned areas and local hot spots in the context of industrial pressure vessels and piping. -- The lower bound limit loads obtained by the mβ-method and the fitness-for-service assessment methods are compared with corresponding results of inelastic finite elastic analyses.


identifier: Ingram, Matthew L. <https://research.library.mun.ca/view/creator_az/Ingram=3AMatthew_L=2E=3A=3A.html>   (2013) Disorienting the rat: do lesions to the DTN and LMN cause rats (Rattus norvegicus) to lose their way?  Masters thesis, Memorial University of Newfoundland.

abstract: The dorsal tegmental nucleus (DTN) and lateral mammillary nucleus (LMN), and the connections between them, are thought to produce the head direction cell signal, which is associated with animal navigation. Bilateral lesions to these structures disrupt head direction (HD) cell firing in downstream areas of the primary HD cell circuit. Rats with bilateral lesions to the DTN (Experiments 1 and 2) or LMN (Experiment 3) were compared to sham controls in a series of tasks where directional sense is thought to be important. The tasks included a directional water T-maze problem where rats were trained to travel in a constant direction from two different locations to locate a hidden platform and two variants of a foraging task where rats were trained to return to a home location after finding food. Rats with lesions to the DTN were impaired across all tasks. Rats with lesions to the LMN were impaired on the variable-hole version of the foraging task, but showed only transient deficits on the water maze task (However, only a small number of rats sustained an acceptable level of damage to the LMN). These data demonstrate the importance of the direction system on these tasks.


identifier: Irina, Nicolae <https://research.library.mun.ca/view/creator_az/Irina=3ANicolae=3A=3A.html>   (2004) Will, belief and faith: Kierkegaard's volitionalism in the context of contemporary debates.  Masters thesis, Memorial University of Newfoundland.

abstract: Many of the participants in the analytical debate on the relation between belief and will have closely considered S0ren Kierkegaard's volitionalist account of the issue. I argue that the attempt to understand the nature of volitionalism requires a closer investigation of Kierkegaard's perspective on the nature of faith. -- In Chapter One, I offer the conceptual framework in which I will discuss the problem of volitionalism, distinguishing between the epistemic and the foundational role of belief. I show that the will has an important role to play in relation to our beliefs, especially when we lack epistemic justification. -- In Chapter Two, I investigate the main features and issues in volitionalism. I address the distinctions between direct vs. indirect volitionalism, and descriptive vs. prescriptive volitionalism, in order to integrate correctly Kierkegaard's account into the contemporary debate on the nature of volitionalism. -- In Chapter Three, I argue in support of my thesis that Kierkegaard's volitionalism is a special sort of direct volitionalism, which is concerned with the role of the will, not in relation to the acquisition of belief, but rather to its actualization. The conclusion reached in this thesis is that Kierkegaard claims that the will enables us to move, through choice, from a set of belief possibilities characterized by "objective uncertainty" to the subjective actuality of belief and existential commitments.


identifier: Islam, Khademul. <https://research.library.mun.ca/view/creator_az/Islam=3AKhademul=2E=3A=3A.html>   (2011) Sizing and control of flywheel energy storage for Ramea wind-hydrogen-diesel hybrid power system.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis, a flywheel energy storage system (FESS) is proposed for the isolated wind-hydrogen-diesel hybrid power system in Ramea, Newfoundland, Canada. Sizing and control of the flywheel energy storage for Ramea wind-hydrogen-diesel hybrid power system is presented. At present, the hybrid power system in Ramea consists of diesel generators, wind turbines, hydrogen generator and Electrolyzer. The main objective of this proposed flywheel energy storage system is to minimize sudden variations of grid voltage and frequency due to variable wind speed and variable load. HOMER software is used for sizing and steady-state simulations, while MATLAB/Simulink is used for modeling and dynamic analysis of Ramea Hybrid power system. The selected size of the FESS is tested experimentally using a setup which is composed of 2kW DC machine based flywheel energy storage. The test DC machine is used as a motor/generator unit coupled with a cast steel flywheel rotor, a programmable data acquisition card, two controllable power supply units, two electromechanical relays and relay driving circuits. Steady state simulation shows that the addition of a flywheel energy storage to Ramea system reduces the fuel consumption by the diesel generator, reduces the excess electrical energy per year, increases the renewable penetration to the grid and reduces the number of starting the diesel generator per year. These observations can be advantageous in prolonging the life span of the diesel generator, as well as reducing its maintenance. Also the observations indicate that the voltage on the grid-side can stabilized under frequency dynamic variation.


identifier: Issac, Manoj Thomas <https://research.library.mun.ca/view/creator_az/Issac=3AManoj_Thomas=3A=3A.html>   (2011) Analysis of full-scale sea-trials manoeuvring data and development and validation of a motion-simulation model for the AUV MUN Explorer.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Autonomous Underwater Vehicles (AUVs) are free-swimming underwater robots capable of navigating on its own by means of the various sensors it carries onboard. AUVs are rapidly emerging as an important tool in ocean exploration. Designers of AUVs rely increasingly on hydrodynamic models as a design tool particularly for the initial phases of vehicle development. These models allow the designer a means for determining the inherent motion behaviour of a proposed vehicle even before its construction and testing. -- The research work addressed in this thesis is aimed at evaluating the performance of a hydrodynamic motion simulation model developed based on the component build-up method for torpedo-shaped underwater vehicles. The model is derived in a form that only requires the specification of the vehicle's geometry, and the lift, drag and moment characteristics of its constituent elements: the hull, control surfaces, propulsion system etc. The total hydrodynamic load acting on the vehicle is obtained by summing up the loads from each of these components. Such a model, developed by previous researchers at Memorial University of Newfoundland (MUN) for a streamlined AUV was available for use in this research. However, this model was never validated against experimental data. In order to validate the model and establish the performance envelope it was necessary to test the simulation model against all possible mission scenarios that a typical AUV would encounter. This required an extensive set of manoeuvring data from real vehicles that resembled a wide range of mission scenarios. -- The availability of a new Explorer class AUV at Memorial University (the MUN Explorer) facilitated the performing of a series of free-running manoeuvring trials at sea. This included straight-line tests, turning circles, zigzags in horizontal and vertical planes and helix manoeuvres. The responses of the vehicle to different manoeuvres are reported in detail in this thesis and formed a major portion of this research. This formed a database, which encompass a range of mission scenarios, against which the simulated response of the vehicle could be compared. Apart from providing a dataset for validation purpose, these manoeuvring trials also provided valuable information on the performance and capabilities of the Explorer, which belongs to the class of a large commercial AUV, and is one of the only seven Explorers operational around the world to date. -- In order to simulate the above manoeuvres, it was necessary to modify the existing hydrodynamic model to one that can capture the specific features of the new AUV - the MUN Explorer. A second model of the MUN Explorer, with a different tail plane configuration from the original, was also developed to study and compare the control plane actions between the two configurations. The ease with which the model was adapted from one vehicle to another as well as the ease with which the model can be reconfigured exemplifies the overriding advantage of using the component build-up method and the generic nature of the hydrodynamic model as well. -- A select number of manoeuvres were simulated using one of the models. Preliminary results from the simulation of steady state manoeuvres show reasonable-to-good agreement with the measured data. The vehicle responses to manoeuvring trials, simulation of a few of these manoeuvres and their comparisons and validation are considered to be some of the main contributions made in this research work.


identifier: Jafarzadehdarzi, Vahid <https://research.library.mun.ca/view/creator_az/Jafarzadehdarzi=3AVahid=3A=3A.html>   (2013) Kant's metaphysics of life.  Masters thesis, Memorial University of Newfoundland.

title: Kant's metaphysics of life

abstract: The present thesis is an attempt to understand the relation between concepts of organized being and life in Kant's philosophy and the status of these concepts in his philosophical system. The main theme of this thesis is the mechanical inexplicability of organized beings due to the peculiar purposiveness of their organization and their relation to the principle of life as the immaterial principle of spontaneous action. Kant's early interest in the concepts in question is manifested in pre-Critical works mainly as the mind-body problem. The first Critique elevates the mind-body problem to the problems of unity of reason and nature, teleology, systematicity and freedom. The third Critique, by introducing the reflecting power of judgment and internal purposiveness, offers a solution to the problem of system and freedom by positing the organized/living being as the mediator between metaphysics and physics and establishes a discourse which could be called a metaphysics of life.


identifier: Jalbert, Annie <https://research.library.mun.ca/view/creator_az/Jalbert=3AAnnie=3A=3A.html>   (2011) When does length cause the word length effect?  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The word length effect - the finding that lists of short words are better recalled than lists of long words - has been termed one of the benchmark findings that any theory of immediate memory must address. The effect is viewed as the best remaining evidence for time-based decay of information in short-term memory. However, previous studies investigating this effect have confounded word length with orthographic neighborhood size. I suggest here that the word length effect may be better explained by the differences in lexical properties of short and long words than by length. Experiments 1a and 1b revealed typical effects of length when short and long words were equated on all relevant dimensions except for neighborhood size. Experiments 2 and 3 showed that when short and long words were equated for neighborhood size, the word length effect disappeared. Experiment 4 replicated the disappearance of the word length effect with spoken recall. In Experiment 5, one-syllable words with a large neighborhood were recalled better than one-syllable words with a small neighborhood. Experiment 6 found that concurrent articulation removed the effect of neighborhood size, just as it removes the effect of word length. Experiment 7 demonstrated that this pattern is also found the nonwords. In Experiment 8, length and neighborhood size were manipulated and only effects of the latter were found. These results are problematic for any theory of memory that includes decay offset by rehearsal, but are consistent with accounts that include a redintegrative stage that is susceptible to disruption by noise. The results also confirm the importance of lexical and linguistic factors on memory tasks thought to tap short-term memory. These results add to the growing literature identifying problems for theories of memory that include decay offset by rehearsal as a central feature.


identifier: Jalbert, Catherine L. <https://research.library.mun.ca/view/creator_az/Jalbert=3ACatherine_L=2E=3A=3A.html>   (2011) A lesson in stone: examining patterns of lithic resources use and craft-learning in the Minas Basin region of Nova Scotia.  Masters thesis, Memorial University of Newfoundland.

abstract: Examining the Late Woodland (1500-450 BP) quarry/workshop site of Davidson Cove, located in the Minas Basin region of Nova Scotia, a sample of debitage and a collection of stone implements appear to provide correlates of the novice and raw material production practices. Many researchers have hypothesized that lithic materials discovered at multiple sites within the region originated from the outcrop at Davidson Cove, however little information is available on lithic sourcing of the Minas Basin cherts. Considering the lack of archaeological knowledge concerning lithic procurement and production, patterns of resource use among the prehistoric indigenous populations in this region of Nova Scotia are established through the analysis of existing collections. By analysing the lithic materials quarried and initially reduced at the quarry/workshop with other contemporaneous assemblages from the region, an interpretation of craft-learning can be situated in the overall technological organization and subsistence strategy for the study area.


identifier: James, David D. <https://research.library.mun.ca/view/creator_az/James=3ADavid_D=2E=3A=3A.html>   (2013) The ethanol oxidation reaction and product distributions in a direct ethanol fuel cell.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: A novel online system for quantifying product distributions of ethanol oxidation in direct ethanol fuel cells was developed. This system was shown to have many advantages over previously reported methodologies such as: ease of operation, quick response time, economical, and real time analysis. This system consisted of a non-dispersive infrared CO₂ detector coupled with a flow-through conductivity detector for CO₂ and acetic acid measurements, respectively. The third ethanol oxidation product, acetaldehyde, was shown to be accurately calculated using a Faradaic charge balance. -- The effects of fuel and product crossover were closely examined. It was shown that the use of oxygen at the cathode can lead to an overestimation of ethanol oxidation products, mainly acetic acid, due to ethanol crossing through the membrane and reacting chemically with oxygen at the cathode. Furthermore, it was shown that significant amounts of acetaldehyde produced during ethanol oxidation were lost due to crossover, leading to an underestimation of its yield. To obtain more accurate product distributions, the fuel cell was operated using N₂/H₂ gas at the cathode (which eliminated the chemically oxidized ethanol reaction). To further improve the accuracy of product yields, a “crossover mode” approach to operating a fuel cell was examined. It was found that this method increased selectivity towards complete oxidation (carbon dioxide) by reducing poisoning of the electrode. -- A kinetic and mechanistic study on the ethanol oxidation reaction was also carried out using an electrode stripping technique. It was found that applying a potential in the range where CO is oxidized, followed by allowing the cell to return to open circuit and then re-applying the potential led to significant increases in CO₂ yields. It was found that the CO₂ yield was dependent on the length of the pulse applied, the shorter the pulsing interval, the higher the yield. This suggests that the majority of the CO₂ produced was attributed to the oxidation of CO adsorbates. The time interval between pulses was also examined. It was found that the CO₂ yield was independent of the resting time, suggesting a rapid dissociation of ethanol on the electrode, which supports previous Iiterature findings. -- A Pt-RuSnO₂/C anode catalyst was developed and tested in our system. This catalyst was found to increase both the performance and the selectivity towards CO₂ in comparison to a Pt electrode, which is rarely reported in the literature.


identifier: Carter, James Edward <https://research.library.mun.ca/view/creator_az/Carter=3AJames_Edward=3A=3A.html>   (1998) Structure, stratigraphy, and geochemistry of the Upper Ordovician Lawrence Harbour formation, Exploits Subzone, Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract: The Upper Ordovician Lawrence Harbour Formation is a significant lithostratigraphic and biostratigraphic marker horizon found throughout the Exploits Subzone. In the Grand Falls-Windsor-Badger region the Lawrence Harbour Formation grades from graptolitic siliceous black shale, to dark grey silty shale, and light grey silty shale, from base to top respectively. It conformably overlies grey bioturbated chert and is itself conformably overlain by sandstone and siltstone turbidites of the Point Leamington Formation. The gradational coarsening upward characteristics and transition into overlying units suggest that the Lawrence Harbour Formation should be included within the Badger Group. -- Geochemical and lithological variation is documented vertically through the formation and appears to be related to increasing grainsize from base to top of the shales. The Lawrence Harbour Formation and inferred equivalents sampled from Notre Dame Bay to Bay D'Espoir. show no marked lateral variation in geochemistry. These trends support a coarsening upward sequence for the shales, and appear to support a model of deposition within a single interconnected basin for the Lawrence Harbour Formation. Geochemical signatures of the shales suggest a calc-alkaline source terrane, with deposition probably occurring in a back arc basin as hemipelagic distal turbidite sediments. -- Regional mapping has defined a grey bioturbated chert unit at least 10 to 15 metres thick that conformably underlies the Lawrence Harbour Formation. The upper gradational contact defined within the study area comprises about 2 metres of chert with interbeds of siliceous black shale that yields graptolites of the N. gracilis Zone. The chert unit has been used as a reliable marker horizon both in this study and in previous work, and as a result is herein elevated to formation status with the name "Northern Arm Formation". -- Extensive polyphase deformation of these Upper Ordovician units commonly produces complex regional outcrop patterns. Detailed outcrop-scale structural maps define reverse faults (D₃) that cross cut limbs of open to close folds (D₂). Regional penetrative cleavage is observed as axial planar to the F₂-folds. These structures were followed by a later stage of deformation that steepened the dirust faults, with a component of strike slip faulting with both sinistral and dextral sense along already formed D₃ thrust faults. Observations on a macroscopic scale define several fault-bound belts that strike northeast-southwest and cross cut southeast facing F₂ regional folds. In all, a total of six phases of deformation are recognized with D₀-D₄ being regional, and D₅ being identified as localised in extent. The D₂ and D₃ deformation events are likely due to the continued compression related to the Salinic and Acadian orogenies.


identifier: Janes, Nicholas Gill <https://research.library.mun.ca/view/creator_az/Janes=3ANicholas_Gill=3A=3A.html>   (2013) Experimental measurement of thermal characteristics of two-phase segmented flow in minichannel heat sinks.  Masters thesis, Memorial University of Newfoundland.

abstract: Experiments were conducted to measure the heat transfer characteristics of non-boiling two-phase segmented flow in two different miniature heat sinks. The heat sinks were manufactured to have a square wave flow path (termed Square Sink) and a spiral flow path (termed Spiral Sink). -- The working fluids used in the experiments were water, canola oil and air. Single phase water and oil were examined first, and the results were used as a basis for comparison of the two-phase flow results. Two-phase flow experiments using water-air and oil-air were then conducted. The flow rates of the water-air and oil-air phases were varied between a range of values during each experiment and the system pressure and temperatures were recorded at each combination of flow rates. -- The experimental data was used to calculate the value of dimensionless heat transfer q* and dimensionless length L*, which were used to compare the thermal performance from each experiment. The two-phase flow experiments for the square heat sink resulted in a dimensionless heat transfer enhancement of 24% for water-air containing long liquid slugs, 39.5% for water-air containing short liquid slugs and 1% for oil-air. The two-phase flow experiments for the spiral heat sink resulted in a dimensionless heat transfer enhancement of 14% for water-air containing short slugs. -- The effects of liquid slug length and void fraction were examined. The effect of liquid slug length was shown to increase the dimensionless heat transfer as the slug length decreased. The effect of void fraction was found to be a controlling factor due to its impact on liquid slug length, which in turn affects dimensionless heat transfer. Finally the efficiencies of the square sink and spiral sinks were compared and it was shown that the spiral sink was most efficient when power requirements are considered.


identifier: Janes, R. Craig <https://research.library.mun.ca/view/creator_az/Janes=3AR=2E_Craig=3A=3A.html>   (1997) The relationship between resource-based learning and information literacy.  Masters thesis, Memorial University of Newfoundland.

abstract: Trends and changes in education are a common part of this field of study and routinely affect the practitioners to the point of confusion. What may be an applicable and advantageous strategy today is often deemed inappropriate at some later date. The strap was once a highly touted form of discipline that has since been viewed as unacceptable and counter productive. So it seems to be with the myriad of educational strategies constantly heralded as the latest saviours of our educational system. More attention needs to be paid to determining the relationship between past and present strategies so that the transition from one to the other, if necessary, is as smooth and acceptable as possible. Practitioners are hardly finished with developing an understanding for one methodology when another, similar strategy is often heaped upon them. It is, in my opinion, important that all are aware of the similarities between the old and the new to help dispel the concerns and frustrations that practitioners have when it comes to implementation. -- This project serves to ease the transition between the traditional Resource-Based Learning strategies and the more recent emphasis on Information Literacy. It provides an examination of both theories and their accompanying strategies along with relevant examples for the Newfoundland and Labrador School Curriculum. It also provides the reader with ways to overcome some of the more commonly indicated barriers to the implementation of such strategies.


identifier: Janes, Rita <https://research.library.mun.ca/view/creator_az/Janes=3ARita=3A=3A.html>   (1974) A study to compare the effectiveness of individual manipulation of instructional materials in learning grade four fractions versus a teacher demonstration method using the same materials.  Masters thesis, Memorial University of Newfoundland.

abstract: Purpose of the study -- The main purpose of this study was to compare the achievement of Grade IV students taught a unit on fractions by a method whereby they individually manipulated concrete materials with a method in which there was only teacher demonstration using the same instructional materials. Another purpose was to compare results achieved in selected levels of Bloom's Taxonomy by the two methods of instruction. -- Procedure -- The investigation was carried out in four Grade IV classes in one school in St. John's, Newfoundland. Two of these classes, consisting of 63 students, comprised the Experimental Group, and the other two classes, consisting of 67 students, formed the Control Group. Intact classes were used and the method of instruction was randomly assigned to the classes. The only difference in instruction for the two groups was the manner in which they concrete materials were used. -- Objectives for a unit in Grade IV fractions were written in behavioral terms by the investigator. The unit was taught for ten consecutive periods of forty-five minutes duration. Three other days were used for testing. -- Students' achievement in the unit on fractions taught in the experiment was measured by a specifically constructed twenty-item test. The items were designed to evaluate the attainment of each objective of the unit and were classified according to the levels of The Taxonomy. The reliability of the test (.74) was found by using a Pearson product moment correlation between the posttest and retention test scores.  The achievement test was given as a pretest, posttest, and retention test. However, the order of the items on the test was changed each time the test was administered. The pretest was given three days previous to the instruction and the posttest was given one day after the completion of instruction. A retention test was administered four weeks later. -- Analysis of covariance and the chi square test were used to analyze the data obtained from the posttest and retention test. The pretest scores were used as a covariate in the Analysis of Covariance. The level of significance was set at .05 for all statistical tests. -- Conclusions -- 1. Grade IV students who individually manipulated concrete materials scored significantly higher on a posttest and a retention test designed to measure achievement in a unit on fractions than those taught by a teacher demonstration method. -- 2. Grade IV students who individually manipulated concrete materials did not show a significant difference in achievement in questions on a posttest and retention test designed to measure Knowledge and Comprehension, compared with those taught by a teacher demonstration method. -- 3. Grade IV students who individually manipulated concrete materials achieved significantly higher on posttest questions designed to measure Application, compared with those taught by a teacher demonstration method. However, there was no difference between the two treatments on retention test questions designed to measure Application. -- 4. Grade IV students who individually manipulated concrete materials scored significantly higher on questions designed to measure Analysis, than did students taught by a teacher demonstration method. -- 5. Grade IV students who individually manipulated concrete materials scored significantly higher on posttest questions designed to measure Synthesis, than those taught by a teacher demonstration method. However, there was no significant difference between the two treatments on a retention test question designed to measure Synthesis.


identifier: Jani, Rajendra <https://research.library.mun.ca/view/creator_az/Jani=3ARajendra=3A=3A.html>   (2006) Development of the hydrocopter autonomous underwater vehicle.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis deals with the development of a small high-speed autonomous underwater vehicle or AW known as the Hydrocopter that can mimic the motion of a helicopter. A model was designed and constructed. It was tested in the Deep Water Tank at Memorial University. A SIMULINK simulation of the AUV was developed to study its underwater motions. The simulation and test responses show that the AUV can move at high speed along any 3D trajectory.


identifier: Jayakody, J. A. Luckshman Priyadharshana <https://research.library.mun.ca/view/creator_az/Jayakody=3AJ=2E_A=2E_Luckshman_Priyadharshana=3A=3A.html>   (2007) The impact of annealing on the molecular structure and properties of Dioscorea Starches.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Dioscorea starches are presently not used in the food industry due to their poor functionality. Annealing has been shown to improve starch functionality. Therefore, the objective of this study was to determine the structural changes within the amorphous and crystalline domains of starches isolated from varieties of D. esculenta and D. alata tubers on annealing, and the impact of these changes on functional properties. Starches from varieties of Dioscorea esculenta (kukulala, java-ala, nattala) and Dioscorea alata (hingurala, raja-ala) tubers grown in Sri Lanka were isolated and their yield, morphology, composition (phosphorus, bound lipid, total amylose and lipid complexed amylose), molecular structure and physicochemical properties were studied in their native and annealed states. Among the D. esculenta starches, nattala exhibited the highest levels of phosphorus (0.1 0%), bound lipid (0.44%) and lipid complexed amylose chains (22.01 %). However, between the D. alata starches, the highest levels of phosphorus (0.05%), bound lipid content (0.25%) and lipid complexed amylose chains (8.34%) was in hingurala. All isolated starches were pure, undamaged and with granule sizes ranging from 3 to 40 μm (D. esculenta) and 30 to 45 μm (D. alata). The granules had smooth surfaces with shapes ranging from polygonal (D. esculenta) to truncated oval or truncated spade in D. alata starches. The amylopectin unit chain length distribution and the average chain length of native D. esculenta ranged from 24.57-25.85% (Degree of polymerization [DP] 6-12), 56.55-59.64% (DP 13-24), 12.61-13.58% (DP25-36), 3.17-4.41 (DP 37-50) and 17.93-18.33%. However, the corresponding values for D. alata starches were 17.89-20.68, 57.40-59.76, 17.46-17.47, 4.46-4.87 and 19.29-19.61%. Among the D. esculenta starches, the highest proportion of DP 37-50 and average chain length was in nattala starch. D. esculenta starches displayed a B-type X-ray pattern. However, a B-type (raja-ala) and Ca-type (hingurala) X-ray patterns were displayed by the D. alata starches. Crystallinities ranged from 49-53%, in the D. esculenta (nattala>java-ala> kukulala) starches, but were similar (43.0%) in the D. alata starches. A V-lipid amylose complex peak was also visible in the X-ray pattern of all starches. -- The gelatinization transition temperatures (To [onset], Tp [mid point], Tc [conclusion]) and enthalpy (ΔH) of gelatinization of native D. esculenta starches ranged from 72.55 to 85.40°C and 17.32-18.07 J/g, respectively. The corresponding values for the D. alata starches being 75.45-92.70°C and 18.60-18.98 J/g, respectively. The extent of amylose leaching (AML) at 90°C, ranged from 5.58 to 6.19% and 13.20 to 13.60% in the D. esculenta and D. alata starches, respectively. Variations in AML among varieties of each species was negligible. Swelling factor at 90°C, ranged from 53.61 to 64.97% in the native D. esculenta (nattala>java-ala>kukulala) and from 36.60 to 38.64% in the D. alata (hingurala>raja-ala) starches. D. esculenta starches exhibited a higher peak viscosity (nattala>kukulala> java-ala), lower pasting temperatures, a greater degree of viscosity breakdown (nattala> java-ala> kukulala) and lower set-back (kukulala>nattala>java-ala) values than D. alata starches. A similar trend was also observed for peak viscosity (raja-ala>hingurala), viscosity breakdown (hingurala> raja-ala) and set-back (raja-ala>hingurala) among the D. alata starches. The rate and extent of acid hydrolysis of D. esculenta starches (nattala>java-ala>kukulala) were higher than those of the D. alata (raja-ala>hingurala) starches. D. esculenta java-ala>kukulala>nattala) starches were more susceptible than D. alata (hingurala>java-ala) towards α-amylolysis. The extent of retrogradation of D. esculenta java-ala>kukulala>nattala) was higher than that of the D. alata (hingurala>raja-ala) starches. -- The second phase involved a study of the impact of annealing on the structure and properties of Dioscorea starches. The granule surface, birefringence patterns, concentric growth rings and the amylopectin unit chain length distribution of all starches remained unchanged on annealing. The crystallinity of some varieties of D. esculenta (kukulala, java-ala) and D. alata (hingurala) starches remained unchanged on annealing. However, crystallinity decreased in nattala (D. esculenta) but increased in raja-ala (D. alata) starches. In addition crystalline polymorphism remained unchanged on annealing. Annealing increased the gelatinization temperatures to nearly the same extent for all starches. However, the gelatinization temperature range (T c-T 0 ) decreased on annealing (hingurala> kukulala>raja-ala>nattala>java-ala). The enthalpy of gelatinization increased marginally (kukulala > hingurala > java-ala > nattala >raja-ala) on annealing. Amylose leaching (AML) and swelling factor (SF) decreased (D. alata> D. esculenta) on annealing. At 90°C, the decrease in AML in the D. esculenta and D. alata starches followed the order: nattala-kukulala>java-ala and raja-ala>hingurala, respectively. However, at the same temperature, the decrease in SF for the D. esculenta and D. alata starches followed the order: kukulala>nattala>java-ala and raja-ala-hingurala, respectively. In the D. esculenta starches, annealing decreased the peak viscosity (kukulala>java-ala>nattala). However, annealing increased peak time (kukulala > nattala > java-ala) pasting temperature (kukulala > nattala-java-ala) and thermal stability (kukulala>nattala>java-ala). The set-back decreased on annealing in kukulala, but increased in both nattala and java-ala (nattala>java-ala) starches. In the D. alata starches, annealing decreased peak viscosity (raja-ala>hingurala), but increased peak time (raja-ala>hingurala), pasting temperature (raja-ala>hingurala) and thermal stability (hingurala>raja-ala). However, set-back decreased in raja-ala but increased in hingurala on annealing. In all starches, the acid hydrolysis pattern remained unchanged on annealing. However, the extent of acid hydrolysis decreased (D. esculenta [java-ala>nattala>kukulala] - D. alata [raja-ala~  hingurala]) on annealing. α-amylolysis decreased on annealing. The extent of this decrease was more pronounced in D. alata (raja-ala>hingurala) than in the D. esculenta java-ala>kukulala) starches. However, annealing increased the susceptibility of nattala starch towards α-amylolysis. The enthalpy of retrogradation decreased in both D. esculenta (kukulala-nattala>java-ala) and D. alata (raja-ala>hingurala) starches. The major findings of this research are: (1) the different responses shown by the Dioscorea cultivars towards annealing were mainly influenced by differences in their composition and molecular structure, (2) differences in physicochemical properties between native and annealed starches are influenced to a large extent by structural changes within the amorphous (interaction between AM-AM and/or AM-AMP chains) and crystalline (AM-AMP and/or AMP-AMP interactions, crystallite reorientation, crystallite perfection, reorientation of phosphate groups on amylopectin) domains of the starch granule during annealing, (3) annealing has a major impact on the thermal stability and extent of retrogradation of Dioscorea starches. Consequently, annealed Dioscorea starches can be used for applications in foods that are subjected to thermal processing and frozen
storage.


identifier: Jehangir, Muhammad <https://research.library.mun.ca/view/creator_az/Jehangir=3AMuhammad=3A=3A.html>   (2006) Information extraction on biological, organic and inorganic materials using image processing techniques.  Masters thesis, Memorial University of Newfoundland.

abstract: Information extraction from images is essential to research in many science faculties today, from computer science to bioinformatics and medicine. My research focuses on the analysis of structural changes in biological, organic and inorganic materials under a variety of conditions. Therefore, I process images from before and after an event (such as the addition of ions) to quantify exactly how much change is occurring in the material. -- My major focus is to write code to automate finding objects/structures (in an image) and calculating their sizes, heights, orientations, and distributions. The data comes from atomic force microscope measurements, which produce multi-layered two-dimensional arrays of data (i.e. sets of three-dimensional images). The image processing involves noise reduction, background leveling, object identification, and then the calculation and display of statistical information. The code used to automate these processes and to present the features to the user is written in the IgorPro Scripting Language. -- The processing of an image proceeds iteratively, where an initial identification of objects/structures in an image leads to a definition of background and noise, which can then be adjusted to better identify the objects. Background leveling can be done vertically as well as horizontally, as per the requirements of a specific image. Distribution (spacing) of objects is calculated in different ways for isotropic versus non-isotropic arrangement of objects. The information about the objects in the images is presented in comparison graphs and summary tables.


identifier: Jennings, Julia M. <https://research.library.mun.ca/view/creator_az/Jennings=3AJulia_M=2E=3A=3A.html>   (2004) Comparison of cognitive and psychomotor performance across gender in hyperbaric and simulated hyperbaric conditions.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis the effects of nitrogen gas narcosis on cognitive and psychomotor performance were examined with respect to gender. Six male and six female participants were each tested at surface pressures breathing air, in a hyperbaric chamber simulating either a depth of 60ft and or a depth of 165 fsw. In a second study participants were tested at a surface pressure of 1 ATmosphere Absolute (ATA) breathing a 30% normoxic nitrous oxide mixture. In study 1 cognition was evaluated using a simple arithmetic test, a modified Stroop test and a number comparison test. These 3 tests of cognition plus a recognition memory test were employed in study 2. Psychomotor performance was evaluated in both studies using a matrices drawing test and a modified Purdue peg-board test. The results illustrated the effects of nitrogen narcosis were not evident for all cognitive tests employed. In both studies, with the exception of the recognition memory test, females performed as well or better than males for these cognitive and psychomotor tests. Females at 1 ATA breathing a 30% normoxic nitrous oxide had significantly lower (p=0.001) memory scores than males but this may have been due to a pre-existing difference in the sample. In conclusion, during actual or simulated nitrogen narcosis, the evidence collected supported little effect of gender on cognitive and psychomotor performance during narcosis.


identifier: Jeppesen, Jens <https://research.library.mun.ca/view/creator_az/Jeppesen=3AJens=3A=3A.html>   (2006) Dylan: transforming leadership through ideas.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis explores transformational leadership, using Bob Dylan as an example. Dylan was chosen to show that artists, in this case a musician, are leaders. A leadership framework was created and used in analyzing Dylan as a transformational leader. Leaders often thought of are presidents, prime ministers, military leaders, educational administrators or religious figures, yet this study focuses on a musician's career in order to show other images of leadership. -- The data used to analyze Bob Dylan include DVD's, Cd's, biographies, books and internet articles. A comprehensive literature search on transformational leadership led to the identification of 13 components included in a transformational leadership framework. It was applied to Dylan's music career throughout the early sixties until the late seventies. This time frame was selected to establish a connection between Dylan and the transformational components identified in the framework. -- The years beyond the seventies were briefly mentioned but not elaborated upon due to time restraints for the research. Further research may be done using the leadership model which has been developed and presented in this thesis to establish other artists as transformational leaders. What was found throughout this research was that Dylan embodied the 13 components of transformational leadership in the time frame which was studied.


identifier: Jernigan, Amanda <https://research.library.mun.ca/view/creator_az/Jernigan=3AAmanda=3A=3A.html>   (2007) Wholes and parts (all puns intended): the mereological vision of Richard Outram's poetic sequences.  Masters thesis, Memorial University of Newfoundland.

abstract: The work of poet Richard Outram (1930-2005) evinces an ongoing concern with part-whole relationships: those broadly classed, in philosophical terms, as "mereological." This thesis explores these relationships in three of Outram's poetic sequences: Hiram and Jenny (1988), Mogul Recollected (1993), and Benedict Abroad (1998). Each sequence elaborates a vision of unity-in-diversity, in which the qualities of wholeness and partness are not opposed but interdependent. The boundaries demarcating parts and wholes, temporal and spatial, are simultaneously maintained and made permeable. This "mereological" reading of Outram's work casts into relief various resonances between theme and form of which these sequences take constant account: the poetic sequence, like the world it depicts, exists in a state of unity-in-diversity. At the same time, this reading shows that Outram's mereological concerns are mortal concerns: deeply involved with a sense of the boundedness of human life, but also with a sense of its connectedness.


identifier: Jesso, Andrew Thomas <https://research.library.mun.ca/view/creator_az/Jesso=3AAndrew_Thomas=3A=3A.html>   (2013) Instructors' attitudes toward the use of technology in the teaching and learning of mathematics in Newfoundland and Labrador post-secondary institutions: a mixed methods study.  Masters thesis, Memorial University of Newfoundland.

abstract: According to the literature, contemporary educational technology may enhance students' understanding of mathematics and consequently increase students' achievements in the subject. The goal of this research was to investigate to what extent technology was being used by instructors of undergraduate mathematics in Newfoundland and Labrador post-secondary institutions, and why some available technological applications were not being implemented in their teaching of mathematics. -- T his thesis presents an interpretive mixed methods study. Firstly, a questionnaire was administered to thirteen post-secondary mathematics instructors in order to clarify their backgrounds, teaching styles, professional views on, and experiences with technology. Secondly, eight of these same instructors were selected for an interview to further discuss in more detail their attitudes toward teaching mathematics with technology. -- This research reveals that instructors are mostly using technology for organizational and communication purposes. The use of mathematics specific technology for tutorial, exploratory, and creative activities with students takes place mostly on an individual basis and only occasionally, and depends on the topic. -- Four major themes emerged from the data: (1) how teaching has changed over time due to the increasing capability and availability of technology for students' and instructors' use, (2) how does the presence of technology influence mathematics curriculum and pedagogy, (3) what are various purposes, advantages, and challenges faced during the process of incorporation of technology in teaching, and ( 4) what is the relationship between students' use of technology and students' knowledge of the fundamentals of mathematics. -- While seeing the values and benefits that technology may offer in teaching, instructors were concerned about the associated costs such as the amount of time, effort, specialists support, and pedagogical knowledge required to the successfulness of its implementation. Instructors worry about possible disadvantages that may follow from improper implementation of technology. They also point out the importance of focused instructional development, collegial support, and departmental initiatives for individual instructors to proceed with technological innovations. -- The implications of this study for the post-secondary educational system in Newfoundland and Labrador are also discussed.


identifier: Jiang, Hong <https://research.library.mun.ca/view/creator_az/Jiang=3AHong=3A=3A.html>   (2006) Influences of iodine or enzymes on the formation of pathogenic thyroglobulin peptides.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis has no abstract.


identifier: Jiang, Xiao <https://research.library.mun.ca/view/creator_az/Jiang=3AXiao=3A=3A.html>   (2011) Study on optimum conditions for diesel spill removal application by a natural resource - peat.  Masters thesis, Memorial University of Newfoundland.

abstract: The balance between energy demand and the conservation of natural resources is a worldwide issue that people have been confronted with for over a thousand years and will continue to be an issue for future generations. Consequently the environment has been more or less destroyed by human activities with the boom of industrialization and modernization especially for non-renewable natural resources. Environmental problems such as increasing global population, water resource shortage, greenhouse gas emission and oil spills have persisted due to the unlimited human demands on obviously limited natural resources. -- Contamination due to discharges from various manufacturing outfits and environmental degradation due to exploration and other associated highly economic human activities have resulted in consistent pollution problems requiring urgent attention.  Many oil clean-up treatments have been developed and proved to be effective both in the laboratory and real situations, but the factorial analysis of diesel removal application under different weather and water environments might be a new research field. This study is based on the ide of using peat as an environmentally friendly material with easy application to clean up diesel-contaminated water from freshwater bodies especially lakes and rivers with low water turbulence. -- An experimental water environment was simulated using varied impact factors such as water temperature, water turbulence and added diesel volume. A 200mL beaker was placed in a 2L cuboid tank which was filled with ice cubes to realize the simulation (for those combinations with 4°C). A 75mL sample of lake water and diesel was added to the beaker to simulate the water body, the 2L cuboid tank was filled with ice cubes and a thermometer was inserted to adjust the environmental temperature under selected combinations. Two types of peat (poorly humified and highly humified) were applied on simulated contaminated water with different combinations of factors that could have an effect on the remaining Total Petroleum Hydrocarbons (TPHs) n the water. TPH analysis was conducted in the laboratory of Maxxam Analytic Inc., St. John’s. Optimum external conditions and both floating and dissolved oil removal efficiency were analyzed and obtained. -- Peat showed a high adsorbing ability as it could adsorb diesel at least 2.6 times its weight in water, and the diesel removal efficiency could be as high as 99.99% with optimum treatment conditions. Experimental results and statistical analysis using Design Expert 7.0® and Minitab15® showed the optimum condition for high removal efficiency was to apply fine horticultural peat for 0.25 h which could remove 99.99% of floating diesel and 82.03% of dissolved diesel. The average remaining TPHs in the treated contaminated water under different external conditions was 3.3.mg/L. Short-time application, lower water turbulence and lower water temperature were suggested to obtain lower remaining TPHs. -- This study analyzed the optimal conditions for applying peat on the surface of diesel-contaminated water. Experimental results and analyses showed that lower water turbulence and lower water temperature were appropriate conditions for the removal of diesel by using peat and shorter reaction time between the peat and diesel was preferred to obtain less remaining TPH in the water -- The reaction mechanisms between functional groups n peat particle surface and oil droplets were not investigated. Other meteorological factors such as wind and marine water were not included in the current experiment.


identifier: Jiao, Yan <https://research.library.mun.ca/view/creator_az/Jiao=3AYan=3A=3A.html>   (2004) Modeling uncertainty in fish population dynamics.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Large uncertainties may exist in modeling various processes determining fisheries population dynamics. The uncertainties may come from various sources such as environmental variations (process errors), measurement errors, and model errors. In order to quantify the uncertainties, an understanding of the complex model error structure in the population dynamic models and how the model error structure affects the parameter estimation is important. In this study I evaluated and quantified the uncertainties in modeling various processes of fisheries population dynamics using Monte Carlo simulations and applied the proposed methods to Atlantic cod stocks. -- The generalized linear model approach, which can readily deal with different error structures, were used to identify suitable model error structure in stock-recruitment modeling, stock biomass modeling, and age-structure population modeling. A simulation study was developed to evaluate the influence of stock mixing on the collection of fish growth data and estimation of growth parameters. The recent status of the Atlantic cod fishery in Divisions 2J3KL was evaluated using a composite risk assessment method which calculates the total risk of overexploitation in the cod fishery. I considered the uncertainties in both biological reference point and current fishing mortality estimates. -- I recommend that the generalized linear model be used to identify appropriate model error structures in stock-recruitment modeling, stock biomass modeling, and age-structure population modeling. I also suggest that stock mixing be incorporated into stock assessment models to improve the estimation of growth parameters in stock assessment. Uncertainty in both management reference points and in indicator reference points should be considered in evaluating stock status using the proposed composite risk assessment method.


identifier: Jin, Qiu <https://research.library.mun.ca/view/creator_az/Jin=3AQiu=3A=3A.html>   (2007) An algorithm for the extraction of ocean surface current velocity from bistatic HF groundwave radar data: a simulation.  Masters thesis, Memorial University of Newfoundland.

abstract: More than seventy percent of our earth surface is covered by ocean. The conditions at sea will not only influence our climate, but also affect human activities such as offshore oil drilling, fisheries, etc. Monitoring ocean surface information, such as surface current, wave and wind conditions, becomes more and more important. High frequency (HF) ground wave radar is proven to be a very useful tool for measuring ocean surface current. The ability of the HF signal to travel beyond the line-of-sight because of the high conductivity of seawater enables the radar to be used to survey and obtain the ocean surface current maps over a large ocean area. The longer radio wavelength also allows measurements to be conducted under all weather conditions. In addition, the features of near real-time measurement and high spatial and temporal resolutions make this method more attractive than conventional techniques, such as are available from surface current meters and drifter buoys. -- The component of the current velocity along the radar look direction can be extracted from the first-order Doppler shift of the electromagnetic wave scattered from the ocean surface. In order to obtain a current vector, at least two projections along different directions should be known. This can be achieved by two widely separated monostatic radar installations, each of which contains a co-located transmitter and receiver. Another, potentially more cost effective, approach is by means of a pair of bistatic and monostatic receivers sharing the same radar transmitter. In this configuration the projections of the current along two different directions can be found and thus the current velocity can be obtained without significantly losing potential coverage. Here, an algorithm is developed to examine the relevant issues of this new approach of surface current measurements. More specifically, the scatter patch in this model is chosen to be along a constant bistatic angle curve. The simulated bistatic and monostatic radar received time series data are processed by averaging fifteen 512-point fast Fourier transforms with 50 percent overlap to yield the Doppler spectrum (power spectral density (PSD)). The first-order Doppler shifts are obtained by comparing the centroid frequencies of the spectral peak regions with their theoretical positions determined by the Bragg scatter mechanism. The current components are obtained from these Doppler offsets. The error analysis is carried out by means of the concept of geometric dilution of precision (GDOP). -- While no consideration is given to the significant problem of sidelobes in the antenna patterns, zero-mean Gaussian noise from external sources is added to simulate pulsed HF radar clutter from the ocean surface. Deep water is assumed when the monostatic and bistatic radar data are simulated. The combination of clutter PSDs and noise makes the simulated radar data more realistic.


identifier: Johansen, April Doris <https://research.library.mun.ca/view/creator_az/Johansen=3AApril_Doris=3A=3A.html>   (1999) Marker assisted selection for Arctic char (Salvelinus alpinus) broodstock development.  Masters thesis, Memorial University of Newfoundland.

abstract: Arctic char is regarded as an excellent candidate for aquaculture. However, the size variability exhibited by this species hampers large scale production. An association study comparing individuals from a population with and without the trait in question, was carried out in combination with selective genotyping in order to determine if there was an association between marker loci and growth. -- The Daniel's Harbour Hatchery Arctic char were found to have very low levels of genetic variation, with only 13 of74 salmonid microsatellites showing variation. This result was not unexpected as the founding population consisted of two males and two females. Three microsatellite loci appeared to be associated with growth in two year classes of Arctic char. As these results were reproducible from year to year it is likely that this is a true association between marker and growth. This hypothesis can be tested by producing families from broodstock containing specific alleles at these loci and examining the association of specific alleles within family members. If the hypothesis is verified, it would be of great benefit to the Arctic char aquaculture industry.


identifier: Johansson, Sara Jane <https://research.library.mun.ca/view/creator_az/Johansson=3ASara_Jane=3A=3A.html>   (2012) Learning words before learning grammar: a case study of passives and unaccusativity in Northern East Cree first language acquisition.  Masters thesis, Memorial University of Newfoundland.

abstract: This longitudinal case study of a child learning Northern East Cree (NEC) (Algonquian; polysynthetic) focuses on the development of the passive construction and unaccusativity from 4;06- 5;10. The passive is acquired over three stages: (i) productive use of morphology and reliance on unanalyzed chunks; (ii) active analysis of the passive construction (errors, self-correction, passive-active alternations) and (iii) mastery of passive grammar marked by an increase in complexity. A set of intransitive verbs that can be unaccusative or unergative are also investigated, with a focus on causative alternations, the range of verbs used, and the development of morphological complexity in utterances, using a measure of Mean Length of Utterance by morpheme. There is an overall increase in grammatical and morphological complexity at 5;06, as expected in U-shaped development. These findings do not support nativist hypotheses that the ability to form passives and unaccusatives matures at a given age (Maturation Hypothesis).


identifier: Johnson, Brian <https://research.library.mun.ca/view/creator_az/Johnson=3ABrian=3A=3A.html>   (2006) The impact of improving fishing gear technology on the fisheries resources.  Masters thesis, Memorial University of Newfoundland.

abstract: Since man first caught a fish he has strived to catch them more efficiently and in greater quantities with less effort. The way the fishery is prosecuted in Newfoundland and Labrador has been evolving for over 500 years, but the most sweeping changes have occurred during the past 100 years. Theses changes, or "improvements", can be divided into three (3) areas: 1) fishing gear technology, 2) vessel design, and 3) electronic aids. This paper examines the effects of improving fishing gear technology with emphasis on the negative and positive effects these changes have had on the abundance of fish stocks harvested in the Newfoundland and Labrador Region. -- The primary species harvested in the Newfoundland and Labrador region at the tum of the century was Atlantic cod (Gadus morhua). Fishing gears used within the Region prior to the twentieth century were passive (e.g. traps and longlines) and depended primarily upon the voluntary movement of cod during their seasonal migrations from the offshore spawning grounds to inshore feeding grounds where they were harvested. Seasonal distribution in inshore waters also largely limited the fishing season to a few months during the summer and autumn, and during the winter for overwintering bay stocks. The range of operation for the fishermen was also limited to the distance they could travel using oars and sails in their small vessels. The use of passive fishing gear persisted in coastal waters, however, harvesting in offshore areas was predominantly conducted using mobile fishing gear. The fishing gear of today is mobile, as are the fishermen, in their larger, diesel powered vessels with electronic equipment for identifying and tracking the movements of fish. Improvements in technology have provided fishermen with the means of finding and fishing in virtually all areas, both inshore and offshore, in the Newfoundland and Labrador Region year round. -- The abundance of virtually all species of fish has declined in the Region during the past 100 years as the fishing gear has improved and new technologies have been introduced to the fishery. Improvements in technology make it possible to capture so many fish that it is now possible to drive many of the fish stocks in the ocean to commercial, and possibly even, biological extinction. -- This paper examines the interaction between improved fishing gear technology and the decline of many groundfish fish stocks harvested in Newfoundland and Labrador Region during the past 100 years, both before and after the collapse of these stocks. The emphasis is on Atlantic cod (Gadus morhua). I review the history of the fishery in the Region, examine the changes in fishing gear technologies, evaluate the changes, detail the status of the Northern cod stocks, and draw my conclusions from the information presented in the paper. The evidence to support my conclusions is largely circumstantial; however, I believe that it is sufficient to reach the conclusion that the improvements in fishing gear technology contributed substantially to the decline in the groundfish fisheries in the Region.


identifier: Johnson, Florence Elizabeth Way <https://research.library.mun.ca/view/creator_az/Johnson=3AFlorence_Elizabeth_Way=3A=3A.html>   (1984) A multidisciplinary investigation of the hemocytogenic nature of the white bodies of the ommastrephid Illex illecebrosus (Lesueur, 1821) (Cephalopoda: coleoidea).  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The present study extends previous descriptions of the white body of cephalopods by providing new information with regard to (1) morphometry, (2) gross anatomy, (3) microscopic anatomy, (4), vasculature, and (5) immunology of the white bodies within Illex illecebrosus. -- The white bodies of I. illecebrosus are paired multilobular organs; one attached to the medial surface of each eye. The multilobate configuration of each white body is related to the compartmentalized nature of the optic sinus that envelops the white body. -- Presumably, each white body is located upon the medial surface of a squid's eye to affect access of its products to the optic sinus and, hence, the general circulation. Hemooscula provide the means whereby this may be accomplished. These portals, the hemooscula, are herein described for the first time. -- In a squid of a given size, the white body (or particular parts of same) is smaller in the male than it is in the female. The length of the subganglionic process is probably one of the first morphometric characteristics of a white body to be established. -- Microscopic structure of white bodies of illecebrosus is similar to that of other species of cephalopod molluscs. The internal fibrous network of a white body together with the outer capsule form a framework for the internal tissue and vasculature. The tissue of the white body is arranged into repetitious, morphological units or groupings of cells. The individual components of the latter can be identified on the basis of their nuclear appearance. -- Four variations of white body cells are presented comprising a developmental series that produces the circulating hemocytes. These perceived variations (I through 4) can best be defined on the basis of differences in nuclear morphology. Earlier workers have attempted to define developmental stages for circulating cells of other cephalopods and a range of invertebrates based on measurements of the nucleus or the presence of cytoplasmic inclusions and have failed to achieve clarity or consistency. The fourth variation in the series, here presented for the first time, is presumably the final developmental stage prior to the circulating hemocytes, although Variation 3 may also be liberated successfully into the circulating blood. -- The white bodies of I. illecebrosus are well vascularized. Blood flows to a white body by way of the anterior and posterior ophthalmic arteries; passes through its tissue via small vessels, sinuli and hemal spaces; and eventually leaves the tissue to enter the enveloping optic sinus by way of the hemooscula; from the optical sinus, entering the venous circulation via the anterior vena cava. -- Based upon immunological characteristics ascertained during studies of unabsorbed and absorbed rabbit antiserum, the possibility of hemocytes being derived from the white body is very high. -- The information compiled within this thesis provides strong evidence in favor of the hypothesis that the white bodies are the site of hemocytogenesis, as has been earlier suggested on less valid grounds.


identifier: Johnson, Ruth Jerrett <https://research.library.mun.ca/view/creator_az/Johnson=3ARuth_Jerrett=3A=3A.html>   (1980) A study of the need for social workers in the schools in Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this study was to determine if there is a need for social work services in the schools in this Province. -- A review of the literature showed that school social work began in the United States as an answer to the unmet needs of school children when social and economic changes were taking place in the United States in the early part of the twentieth century. Since that time it has continued to develop along these lines and has constantly expanded its scope. -- The focus of school services has been on the identification of patterns of underachievement among students; deficiencies in the school facilities; and, on designing and implementing specialized programs for helping children in distress. Success has been evident in such areas as group work with students and parents, home-school based education programs and involvement in community boards and associations. The latter has been undertaken in order to change some of the policies which are standing in the way of furthering progressive services to children. -- In order to test out the findings in these reports from the literature the author spent three months carrying out social work activities in an elementary school in St. John's. The purpose of this project was to demonstrate that there is a need for social workers in Newfoundland schools. -- To further verify this need and to show the feasibility of this proposition, a report on one of the casestudies from the project is outlined in Chapter Four. This study, using single-subject design, was completed to test the efficacy of behaviour therapy as a method of treatment for a hyperactive child who had been the source of many problems in school. -- The general findings regarding school social work suggest that teachers and other school personnel are very aware of the personal and family problems with which children must live. They are also aware that the needs of these students for specialized counselling are not being met. Consequently, school officials are very receptive to the idea of having social workers available in the schools. -- The results of the programs implemented with the individual child, as reported in Chapter Four, were positive and showed a significant change in his behaviour during the treatment period. -- Since the overall findings of the study are relevant to a considerable proportion of the school population, it was recommended that a program of school social work services should be developed for all schools – a program that would use all available resources to help school children solve problems which might prevent their achieving, either academically or socially.


identifier: Jojart, Istvan <https://research.library.mun.ca/view/creator_az/Jojart=3AIstvan=3A=3A.html>   (1997) Study of plasminogen activation by human trophoblasts.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Successful implantation and placentation during pregnancy depend on the regulated expression of trophoblast-associated protease activity. One of the proteolytic mechanisms utilized by trophoblasts is plasmin generation which is thought to be involved in trophoblast invasion and control of placental fibrin deposition. In this study, the production and regulation of plasminogen activator (PA) activity by human villous trophoblasts were investigated. -- Primary trophoblast cultures were established from normal human term placentas. Highly purified villous cytotrophoblasts were isolated through sequential trypsin-DNase digestions of the selected villous tissue, followed by Percoll density gradient centrifugation and subsequent removal of contaminating cells using monoclonal antibodies to monomorphic determinants of HLA class I and class II antigens. When placed in culture, the isolated cells were characterized as being cytokeratin positive, vimentin, HLA-ABC, HLA-DR and CD68 negative. In about 48 hours the majority of the cytotrophoblasts transformed into syncytiotrophoblasts. The cultures were functionally viable as assessed by their capacity for hCG secretion and reductive cleavage of MTT. No significant cytotrophoblast cell proliferation could be demonstrated in ³H-thymidine uptake experiments, and trophoblasts at their syncytiotrophoblastic stage did not proliferate at all. -- When the expression of plasminogen activators and their specific inhibitors in vitro was compared with m vivo findings 7 distinct differences were found. Immunocytochemical studies in term placental tissue showed strong syncytial PAI-2 immunoreactivity and faint to moderate PAI-1  staining. No staining could be demonstrated for either u-P A or t-PA. In contrast, the majority of cultured trophoblasts expressed u-PA during the first 24 hours of culture. All forms of trophoblast (mononuclear trophoblasts, multinuclear aggregates and syncytiotrophoblasts) expressed PAI-1, but only occasional syncytiotrophoblasts stained positively for PAI-2 and no t-PA immunoreactive trophoblasts were observed. Trophoblast-secreted PAI-1 could also be detected in conditioned media by ELISA. -- Activation of plasminogen was measured by monitoring the conversion of exogenously added Glu-plasminogen to plasmin in serum-free trophoblast cultures, using a chromogenic plasmin substrate H-D-V al-Leu-Lys-pNA (S-2251 ). Plasminogen activation by trophoblasts followed Michaelis-Menten type kinetics and produced parabolic progress curves of pNA accumulation that could be transformed to linear progress curves of plasmin generation, the slopes of which yielded constant rates of plasmin generation (i.e. PA activity). Trophoblast-associated plasminogen activation was found to originate from u-PA but not t-PA, because plasmin generation was markedly reduced in the presence of a neutralizing antibody to u-PA but not appreciably in the presence of a neutralizing antibody to t-PA. In addition, trophoblasts enhanced plasminogen activation induced by exogenous pro-u-PA, suggesting that cell surface binding of pro-u-PA potentiates the generation of plasmin. The basal level of endogenous trophoblast PA activity was specifically augmented by a neutralizing antibody to PAI-1, indicating that trophoblast-secreted PAI-1 regulates PA activity in an autocrine manner. Consistent with this finding, physiological  concentrations of exogenous PAI-1 and PAI-2 resulted in a dose-dependent inhibition of PA activity. -- In order to define modulators of trophoblast-associated PA activity, several types of molecules were tested Activated protein C (APC) increased, whereas thrombin decreased PA activity, demonstrating that the coagulation system has the potential to modulate trophoblast plasminogen activation. Among growth factors/cytokines, EGF and its structural analog TGF-α proved to be potent stimulators. A neutralizing antibody to EGF did not have an effect, suggesting that term trophoblast cultures do not produce a sufficient quantity of EGF to modulate PA activity. TGF-β, IGF-II and IL-1β did not change PA activity appreciably, nor did LPS, a known stimulator of IL-1 secretion. With respect to hormones, dexamethasone and hCG had an inhibitory effect. Agents that elevate intracellular cAMP levels (8-bromo-cAMP and forskolin) inhibited plasminogen activation, whereas PMA had no appreciable effect. -- Taken together, this study demonstrates that the human term villous  trophoblast possesses a highly regulated plasminogen activation system, and various types of physiologically important molecules including enzymes, growth factors, steroid and peptide hormones modulate the generation of trophoblast-associated plasmin.


identifier: Jones, Krista <https://research.library.mun.ca/view/creator_az/Jones=3AKrista=3A=3A.html>   (2011) Communicating perceived geospatial data quality of 3D objects in virtual globes.  Masters thesis, Memorial University of Newfoundland.

abstract: The emergence of Web 2.0 and applications such as on-line mapping and virtual globes (VGs) have significantly changed the way geospatial data are used. While the use, creation and analysis of geospatial data was once the realm of experts, these recent technological advancements have led to the democratization of geospatial data. Maps can now be produced by the contribution of thousands of users. This creates challenges when one wants to rely on such data to make a decision, as the quality of the geospatial dataset can be highly heterogeneous or even unknown. This thesis presents an approach for visualizing the perceived quality of 3D objects in VGs. The visualization approach developed adapts an approach successfully used in other domains, the five star and user feedback system, to communicate the reliability or quality of data/products to lay users. This approach helped identify a method of communication which is both technically feasible and easily understandable by both expert and non-expert users alike, while not oversimplifying the quality information being communicated. Determining the appropriate ways in which to visualize this approach in a 3D geospatial environment was then done through implementing prototypes and preforming a user evaluation. The results of the user evaluation suggest that the preferred visualization method uses a number within a star to show the object's quality, while the least preferred method is the typically used visualization using five individual stars.


identifier: Jones, Natalie <https://research.library.mun.ca/view/creator_az/Jones=3ANatalie=3A=3A.html>   (2011) Interaction with health professionals and change in Canadian adolescents' social support perceptions from the prenatal to the postnatal period.  Masters thesis, Memorial University of Newfoundland.

abstract: For pregnant adolescents, the availability of support from others may be important to how they simultaneously navigate the challenges presented by adolescent psychosocial development and the transition to motherhood. This support from others is generally encompassed under the construct of social support. The purpose of this cross-sectional, exploratory study was to determine if Canadian adolescents perceive adequate social support to be available in the prenatal and postpartum periods and whether or not select contact with health professionals influences perceived availability of social support over time. Specifically, the effects of adolescents’’ timing of initiation of prenatal care, prenatal class attendance, postpartum contact with a healthcare provider, and timing of postnatal contact with a healthcare provider were explored. Using data collected from the Canadian Maternity Experiences Survey (CMES), the sample consisted of 297 Canadian adolescent mothers, weighted to represent 2.262. Results indicated that the majority of Canadian adolescents perceived adequate social support to be available both in the prenatal and postpartum period, however, perceptions of availability of support changed for some participants from the prenatal to the postpartum period. Bivariate logistic regression analyses found that adolescents reporting postpartum contact with a healthcare provider were 5.23 times more likely to perceive a decrease in social support perceptions between the prenatal and postnatal period [OR = 5.23, 95% CI (1.6, 17.14), p = .006], while other variables explored showed little or no effect. Implications of these results for nursing practice, education, and research are discussed.