The objective of the thesis is to synchronically analyze the morphological structure of noun suffixes: analyze phonemes distribution and demonstrate their joining possibilities and limits in noun suffixes. The structure of morphemes is the least analyzed part of morphology. Linguists have mostly analyzed morphologic alteration of phonemes (vowel alteration, metathesis, consonant alteration). More comprehensive analyses of the phonetic structure of the root of the word of modern Lithuanian have not been performed till today. Affixes have not been analyzed at all. This is the first attempt aiming to show the structural peculiarities of Lithuanian noun suffixes. The thesis sets the following tasks: a) To identify and define the noun suffixes phonemic component parts and their relations. b) To identify structural models and productivity of noun suffixes. c) To calculate statistic characteristics of phonemes used in noun suffixes. The noun suffix nr. 571 has been selected to serve as an empiric material from “Lithuanian Grammar” volume 1 (LKG, 1965, p.251-423) by Vincas Urbutis chapters on composition of the noun. The thesis follows the defined limits of suffixes in V. Urbutis grammar. International words have been completely disregarded. While analyzing the structure of noun suffix, the analyzed suffixes are divided into 3 groups for convenience and clarity: monosyllabic, polysyllabic and non-syllabic suffixes. Each group is analyzed separately. The following components are... [to full text]

No description available.

In-Situ Combustion (ISC) is a very complex thermal recovery process that is strongly affected by the chemical composition and physical properties of reservoir rock and fluids. Stability of the process depends on the amount of heat continuously generated from the chemical reactions between fuel formed during ISC and injected oxygen. Heat generation depends on the amount of fuel formed, which, in turn, is affected by initial oil saturation (IOS). Thus, in this study, ISC process dynamics were investigated at various saturations on 7.5 °API Peace River bitumen, under 3.4 l/min air injection rate. Through one-dimensional combustion tube experiments higher combustion front temperatures were observed for increased IOS. The degree of bitumen upgrading was determined in terms of viscosity and API gravity changes. Correlations for hydrogen-carbon ratio, air requirement, consumed fuel, and combustion front velocity were obtained. Good burning characteristics of Peace River bitumen resulted in stable self-sustained combustion with 26.01% IOS. However, an experiment with 13.39% IOS failed because of insufficient fuel generation. Furthermore, X-Ray cross-sectional images were taken along the combustion tube after each run to support and enhance the interpretation of experimental results. Particularly, fluctuations in concentrations of produced gas composition were explained with computed tomography (CT) data.

Fracture conductivity and the effects of treatment variables can be studied in the laboratory. We conducted experiments based on scaling down the field conditions to laboratory scale by matching Reynold’s and Peclet numbers. Experiments conducted were comprised of three stages: dynamic etching, surface characterization of etched cores, and conductivity measurement. The effect of initial condition of fracture surfaces on the etching pattern and conductivity were investigated in this study. Another area of interest is the variation of conductivity along the fracture due to acid spending. We also investigated the contact time, acid system type, and treatment temperature effects on conductivity using San Andres dolomite cores. The results from these studies showed that rough-surface fractures generate higher conductivity by an order of magnitude compared with a smooth-surface fracture at low-closure stress. Also, conductivity generated on rough-surface fractures by smoothing peaks and deepening valleys which widen the gap between the fracture surfaces after closure and acid creates conductivity on smooth-surface fractures by differential etching that creates asperities. The results suggest that an increase in acid spending does not automatically result in lower conductivity; and etched volume alone is not adequate to predicate the conductivity. Conductivity results from a combination of etching pattern, etched volume, and rock compressive strength after etching. In-situ crosslinked acid was found to be more effective in etching rock and controlling acid leakoff compared with linear-gelled acid. Also, crosslinked acid reduces the number of pits and the pit diameters. Based on conductivity tests, linear-gelled acid is more favorable at higher temperatures while in-situ crosslinked acid showed higher conductivity at lower temperatures. For a rough-surface fracture, shorter contact time created high conductivity compared to longer contact while injecting the same volume of acid, suggesting the existence of an optimum contact time.

This thesis examines the effects of spatial location, Reynolds number and near exit flow modification on the development region of a round, free, turbulent jet. It is based on the publications generated by the author. The experiments were carried out over the range of Reynolds numbers between 10000 < ReD < 50000, where ReD is calculated based on the jet exit mean velocity and the nozzle exit diameter. The measurements were performed in the near- to intermediate-field region of a free jet defined between 0 ≤ x/D ≤ 30. In order to control the flow near the exit, two wire rings, with square cross-sections, of sides h = 1.5 mm, and outer diameter Dwire = 71.6 mm (positioned in the shear layer and called Rsl) and Dwire = 60 mm (positioned in the potential core and called Rpc) were placed at a stand-off distance downstream of the jet nozzle exit plane x/D = 0.03. Both stationary and flying hot wires were used to investigate the jet flow field. The results showed a considerable reduction in the jet spread rate and turbulence intensity using the passive rings. The reduction in the velocity decay rate was more obvious in the case of Rsl in lower Re; however, it was observed that as Re increases, the velocity decay rate became nearly the same for both cases of Rsl and Rpc. The axial velocity spectra showed the initial shear layer instability (shear layer mode) was suppressed while the jet preferred instability (preferred mode) remained active as the shear layer and potential core were modified. This shows the separation of these modes and is at variance with ideas that appeared in the literature that claimed the dependency of these two modes. / Thesis (Master, Mechanical and Materials Engineering) -- Queen's University, 2012-04-27 16:06:31.03

No description available.

<p>This thesis is concerned with singularly perturbed two-parameter problems. We study a tted nite difference method as applied on two different meshes namely a piecewise mesh (of Shishkin type) and a graded mesh (of Bakhvalov type) as well as a tted operator nite di erence method. We notice that results on Bakhvalov mesh are better than those on Shishkin mesh. However, piecewise uniform meshes provide a simpler platform for analysis and computations. Fitted operator methods are even simpler in these regards due to the ease of operating on uniform meshes. Richardson extrapolation is applied on one of the tted mesh nite di erence method (those based on Shishkin mesh) as well as on the tted operator nite di erence method in order to improve the accuracy and/or the order of convergence. This is our main contribution to this eld and in fact we have achieved very good results after extrapolation on the tted operator finitete difference method. Extensive numerical computations are carried out on to confirm the theoretical results.</p>

Problems with storm water runoff are becoming more frequent, and the main cause is the increase of impervious cover (IC). The imperviousness increases stream peak flows, changes peak times, and so changes the flood distribution. Several policies are used to manage flows and flooding; however most have been reported to be inefficient because land owners do not have correct exposure to price incentives and risk. The main contributions of this thesis are an investigation into market mechanisms to price and allocate impervious cover allowances, while managing flood distribution. The market mechanisms are based on the electricity and gas markets which use linear programming formulations. This thesis develops three net pool market mechanisms: Det_MarketIC is a capped and deterministic market for IC, and Sto_MarketIC and Sto_MarketIC_Risk are stochastic market models with flood component penalties and risk positions representing the desired risk from the community respectively. Additionally, a gross pool market was extended under rainfall uncertainty, Gross_MarketIC. The market design is an auction system with operational constraints and bids for IC allowances from participants. The system relates physical routed flows at nodal or control points to these bids. The models clear the market by creating a demand (supply) curve for increments (reductions) in flows at specific places, and accounts for marginal changes in the expected flood damage and flood damage components. The market formulations estimate efficient allocations and prices. Decomposed prices from the market models are shown based on duality, as applied in electricity markets. The dual prices show spatial and temporal effects of flows, which impact at flooding areas. With Sto_MarketIC and Gross_MarketIC, prices account for changes in flood distribution. With Sto_MarketIC_Risk, prices also account for the risk as CVaR in flooding areas. Thus, prices increase as binding risk conditions are tightened. Finally, the net pool models are illustrated using hydrological and hydraulic simulators based on a small catchment located in Canterbury, New Zealand. Allocations and prices varied with the different models. Participants would face increasing prices in their IC allowances due to increments in flood damage.

Wood stiffness or modulus of elasticity (MOE) is one of the most important wood properties for solid timber applications, and as such, the efficacy of wood use, especially for structural timber is strongly related to MOE. MOE in Pinus radiata is highly variable and poorly understood. In this study, the effect of initial stand spacing and breed on outerwood MOE and the vertical distribution of MOE of Pinus radiata was assessed. Understanding positive or negative influences of growth caused by initial stand spacing and genetic material on MOE is appealing because it could enable us to better comprehend how forest growers could adapt silvicultural operations to the demands of wood processing. Physical characteristics of different breeds and propagation methods of Pinus radiata were assessed at a variety of initial stand spacings. Stem diameter, crown height, stem slenderness and branch size were all heavily influenced by stand spacing. Breed had a marginally significant influence on diameter and stem slenderness. Internode length was not affected by stand spacing, but showed sizeable differences, especially between the long internode 870 breed and the remaining growth and form (GF) breeds. Outerwood MOE was significantly (P<0.0001) influenced by stand spacing and breed, but not their interaction (P>0.05). MOE scaled positively with stand spacing. MOE increased by 39% from 5.4 GPa at 209 stems ha-1 to 7.5 GPa at 2551 stems ha-1. The majority of this increase (33%) occurred between 209 and 835 stems ha-1. Physiologically aged cuttings of greater maturation status exhibited greater MOE, with the three-year-old cuttings being stiffer than the one-year-old cuttings, seedlings from the 870, 268 and 850 series, by 15, 17, 22 and 27%, respectively. Stem slenderness exhibited the strongest significant (P<0.0001) relationship with MOE (r2=0.49), followed by green crown height (r2=0.46) and diameter (r2=0.44). Stem slenderness and green crown height had a direct influence on MOE that explained 53% of the variance in MOE. MOE was also significantly (P<0.0001) influenced by spacing and breed when using the resonance technique to assess whole stem MOE. The vertical distribution of MOE showed that the lowest portion of the stem (bolt 1) was approximately 30% less stiff than bolts 2 and 3. After the greatest MOE value had been obtained at bolt 3, MOE gently declined to the top of the measured stem. Variation of MOE within trees was significant (58%) at the high stockings of 1457 and 2551 stems ha-1, but somewhat lower (36%) at the lower stockings. The 870 breed was approximately 8% and 16% stiffer than the 268 and 850 breeding series respectively, across all stockings, with the three-year-old cuttings being 7% stiffer than the one-year-old cuttings. At stockings of 481 stems ha-1 and less, the proportional height at which MOE was greatest within a tree was between 25% and 50% of stem height. At stockings above 481 stems ha-1 the proportional height at which maximum MOE was obtained was between 15% and 40% of stem height. Bolt slenderness was found to be the most significant factor impacting on MOE of the bolt. Regression of critical buckling height against diameter at ground level yielded a scaling exponent of 0.55, which was lower than the scaling exponent of 0.67 predicted with constant density-specific stiffness. There was a tendency for some bolts with lower mean diameter to display significantly higher safety margins than bolts with higher mean diameter, suggesting that the largest bolts, which occur at the base of tree, are the point of most likely critical failure.

The purpose of the present study was to determine the achievement levels and expressed attitudes and feelings, five years later in 1972, of a group of students who learned to read in grade one in 1966-1967, using i.t.a. in comparison to a group who learned to read using T.O.Four areas of achievement, namely Reading Vocabulary, Reading Comprehension, Spelling, and Mathematics were tested by use of selected sub-sections of the California Achievement Test. A questionnaire was developed to determine the attitudes and feelings of students toward first grade reading experiences and their present attitudes and feelings toward reading in 1972.A Lorge-Thorndike Intelligence Test administered during the first grade was used as the entry level for the analysis of co-variance. Analysis of variance and covariance were the statistical techniques used to determine the differences between the groups that might be attributed to sex, method, or sex by method interaction.The student sample for the study consisted of 143 pupils from the Marion Community Schools, located in Marion, Indiana. The method of instruction of 67 of the pupils hadbeen i.t.a. in first grade while 76 pupils in the same schools had instruction with T.U. materials. The students have been exposed to various materials in the five years since their initial learning experiences, with random grouping of those who were initially presented i.t.a. or T.O.Data were analyzed to test the null hypotheses:There are no differences in levels of achievement of pupils who learned to read using i.t.a. and those using T.O. on either of the four dependent measures attributable to the following,1. sex2. method3. sex by method. interactionThe computed F ratios were not significant between sexes, methods, or sex by method interaction for reading vocabulary, reading comprehension, spelling, and mathematics, therefore the null hypotheses could not be rejected, for these areas of achievement.There are no differences in levels of achievement of pupils who learned to read using i.t.a. and those using T.O. on either of the four dependent measures with the entry level as a co-variant attributable to the following,1. sex2. method3. sex by method interactionThe computed F ratios were not significant between methods or sex by method interaction for reading vocabulary, reading comprehension, spelling, and mathematics when the entry level was used as a co-variant. The computed F ratios were not significant between sexes for reading vocabulary, reading comprehension, and mathematics when the entry level was used as a co-variant. The computed F ratio was significant between sex for spelling when the entry level was used as a co-variant. The co-variant, entry level, was significant. The null hypotheses could not be rejected for differences between methods or sex by method interaction for reading vocabulary, reading comprehension, spelling, and mathematics when the entry level was used as a co-variant. The null hypotheses could not be rejected for differences between sexes for reading vocabulary, reading comprehension, and mathematics with the entry level as a co-variant. The null hypotheses for differences between sexes must be rejected for spelling with the entry level as a co-variant because significant differences were found.Data were analyzed to test the null hypotheses:There is no difference in attitude toward beginning reading learning as revealed by a questionnaire between pupils in the group who learned to read using i.t.a. and those using T.O. for,1. the total group2. the boys3. the girlsOnly slight differences were found in the responses to the part of the questionnaire concerning reading attitudes and feelings about learning to read. Therefore the null hypotheses could not be rejected.Data were analyzed to test the null hypotheses: There is no difference in attitude toward reading as revealed by a questionnaire between pupils in the group who learned to read using i.t.a. and those using T.O. for, 1. the total group2. the boys3. the girlsNo consistent differences in attitudes and feelings were revealed in answers to the part of the questionnaire concerning attitudes and feelings about reading at the present time (1972). Therefore the null hypotheses could not be rejected.For the pupils in this study it seems tenable to conclude that little difference exists in the achievement levels of reading, spelling, and mathematics between the group of students who learned to read using i.t.a. and the group who learned to read using T.O. after five years of study beyond the initial reading learning experiences.Likewise, little difference exists in the expressed attitudes and feelings of these groups.Spelling achievement levels were significantly different between sexes with the entry level as a co-variant. Girls then scored higher than boys regardless of the method.The entry level, a first grade intelligence test score, was significant for each area of achievement. Therefore it seems tenable to conclude that intelligence, as measured by this instrument, played an important part in the achievement of both groups. Students scoring higher on the intellectual measure also scored higher on achievement tests regardless of the method and students scoring poorer on the intellectual measure also scored poorer on the achievement test regardless of the method.