Bulk density, angles of repose and coefficients of friction against four structural surfaces of two varieties of high oil content canola (Invigor 5440; oil content 47.1% ± 0.27%; and Nex4 105; oil content 45.4% ± 0.35%) and mixtures of them (with ratios of 1:1, 1:2 and 2:1) at four moisture contents (8%, 10%, 12% and 14%, wet basis) were determined. The same physical properties of one high oil content canola (45H29; oil content 45.4% ± 0.12%) and one low oil content canola (5525 Clearfield; oil content 42.4% ± 0.07%) at three moisture contents (8%, 10% and 12%) were determined. The coefficient of friction was measured against four structural surfaces: galvanized steel, plywood, and wood-floated and steel-trowelled concrete. Seed major and minor axes (dimension) of 45H29 canola at moisture contents of 8%, 10% and 12%, and Nex4 105, Invigor 5440 and 5525 Clearfield canola at 10% moisture content were measured. Major and minor axes of 45H29 increased with increases in moisture content. The oil content did not affect axes of canola seeds. Bulk densities were significantly different between Invigor 5440 and Nex4 105 canola. Bulk densities of mixtures of Invigor 5440 and Nex4 105 were higher than that of Nex4 105 and lower than that of Invigor 5440. Bulk density decreased with an increase in oil content. Angles of repose depended more on canola types and surface properties than oil content. Coefficient of friction against structural surfaces was not significantly affected by moisture content but was affected by oil content. Bins used to store low oil content canola could be used to store high oil content canola. Temperature and moisture content of stored crops affect safe storage time. The three high oil content canola varieties (45H29, Invigor 5440 and Nex4 105) and one low oil content canola variety (5525 Clearfield) with 8%, 10%, 12% and 14% initial moisture contents (wet basis) were stored at 10ºC, 20ºC, 30ºC and 40ºC for 20 wk. Moisture content, germination, fatty acid value (FAV) and visible and invisible mould of the canola seeds were determined every 2 or 4 wk. Increase of moisture content and temperature increased germination loss and mould infection. Fatty acid values of canola seeds at 10ºC, 20ºC and 30ºC increased with an increase of storage time; but at 40ºC, it increased at the beginning of storage, and then dramatically decreased. Storage fungi (Penicillium spp., Aspergillus glaucus group and Aspergillus candidus Link) were predominant throughout the study. Invisible mould and FAV were not suitable for predicting safe storage time of canola. Based on the 20% loss of initial germination, safe storage guidelines of high oil content canola were developed. To safely store high oil content canola, its moisture content should be lower than that of low oil content canola. The variety (Nex4 105) with 10% initial moisture content was stored in three large bins (2.74 m diameter; 5.03 m high) at simulated Western Canadian storage conditions (from September to December in the year 2010), to verify the developed safe storage guidelines of high oil content canola. The developed safe storage guidelines worked well in the real situation, except that hot spots in the grain bulk might cause dramatic increase of moisture content and temperature that can accelerate canola deterioration.

There is no abstract available for this dissertation.

The purpose of this study was to determine if any relationship exists among the factors of:(1) strictness of a secondary school's attendance policy,(2) its attendance percentages, and(3) its withdrawal/expulsion/push out percentages with respect to the school's:(4) student enrollment totals of grades seven through twelve;(5) proximity to an urban or metropolitan area; and(6) socio-economic status of the students.This quantitative study involved four (4) independent variables [policy strictness, enrollment size, urban location, and SES] and two (2) dependent variables [attendance percentages and withdrawal percentages]. Six (6) null hypotheses were tested.A questionnaire was sent to the principal of each of the 668 secondary schools which housed any combination of grades 7 through 12. The primary focus of the survey instrument was to have the schools self-determine the strictness of their attendance policies which were in effect for the 1989-90 school year.The attendance, withdrawal, SES, urban type, and enrollment size data were obtained from the Indiana Department of Education office in Indianapolis. The 1989-90 school year data was used. Each school's DOE-AG (Attendance & Graduates) and DOE-WD (Withdrawal) statistics reported in June of 1990 was compared to the questionnaire answers.Three (3) two-way analysis of variance tests (ANOVA) and F-tests for mean differences were used in the treatment of the data. Post hoc tests using the LSD procedure were also used on all groups showing significant differences at the 0.05 level.Eight of the twelve F-tests showed significant differences at the .05 level and in fact were found to be below a .001 level of probability that the differences were by chance. Also, significant interaction was found between two of the groups (policy group and urban type) when compared to attendance percentage.The findings were:(1) Attendance was most influenced by school size and urban type location than the other factors of policy strictness or socio-economic status of the students. Attendance rates were the poorest in large schools and in schools located closer to urban areas.(2) Withdrawal rates were to be highest in large schools and in schools located in metropolitan areas.(3) Strictness of a school's attendance policy did not seem to have a predictable impact upon the attendance rates of the student body with respect to the school's size, urban location, or the socio-economic status of the students. / Department of Educational Leadership

Various High Availability DataBase systems (HADB) are used to provide high availability. Pairing an active database system with a standby system is one commonly used HADB techniques. The active system serves read/write workloads. One or more standby systems replicate the active and serve read-only workloads. Though widely used, this technique has some significant drawbacks: The active system becomes the bottleneck under heavy write workloads. Replicating changes synchronously from the active to the standbys further reduces the performance of the active system. Asynchronous replication, however, risk the loss of updates during failover. The shared-nothing architecture of active-standby systems is unnecessarily complex and cost inefficient. In this thesis we present SHADOW systems, a new technique for database high availability. In a SHADOW system, the responsibility for database replication is pushed from the database systems into a shared, reliable, storage system. The active and standby systems share access to a single logical copy of the database, which resides in shared storage. SHADOW introduces write offloading, which frees the active system from the need to update the persistent database, placing that responsibility on the underutilized standby system instead. By exploiting shared storage, SHADOW systems avoid the overhead of database-managed synchronized replication, while ensuring that no updates will be lost during a failover. We have implemented a SHADOW system using PostgreSQL, and we present the results of a performance evaluation that shows that the SHADOW system can outperform both traditional synchronous replication and standalone PostgreSQL systems.

The goal of this thesis is to determine power counting rules at next-to-leading order (NLO) in the hard thermal loop (HTL) resummation. The original paper by Braaten and Pisarski discusses NLO HTL resummation and argues that there are potentially three types of contributions. We start by studying these terms in the specific case of the boson and fermion self energies in QED and QCD, as these quantities have been calculated in previous literature. For the real and imaginary parts of the fermion and gluon self energies, one needs to calculate only one type of term, as the other two are found to be subleading. However, for the real and imaginary parts of the photon self energy, all types of terms need to be calculated.

This study is designed to investigate the nature of pathologically significant placentas and their corresponding fetal and neonatal outcomes in term infants. We aim to examine the correlation between specific placental pathologies and neonatal clinical conditions, including brain injury, requiring admission to a neonatal care unit and subsequent follow-up in our High Risk Newborn Follow-up Program (HRFU). A retrospective cohort study was conducted through review of maternal and neonatal reports. Overall 48 neonates had placentas submitted for examination. Sixty-one percent of placentas in the HRFU group and 62% of placentas in the non-HRFU group had findings consistent with ischemic changes, meconium staining and calcifications. Three infants had hypoxic ischemic encephalopathy. This study found no difference in placental pathology between non-HRFU infants and infants enrolled in the HRFU Program. This raises questions and warrants further study on the efficacy for placental submission as a predictive measure for neonatal outcomes.

Apparatus to measure the thermal conductivity of YBa(_2)Cu(_3)O(_7-δ) at temperatures between 20K and 120K has been designed and constructed. The thermal conductivity is measured using a longitudinal steady state heat flow technique. Thermal conductivity measurements have been performed upon a sample of YBa(_2)Cu(_3)O(_7-δ) which has been subjected to a series of heat treatments in order to remove oxygen from the material. The measurements show conclusively that the thermal conductivity of YBa(_2)Cu(_3)O(_7-δ) is very strongly influenced by the oxygen content of the material. A reduction of the oxygen content of the material results in a substantial lowering of the thermal conductivity. To explain this result, a quantitative model has been constructed; the model demonstrates that consideration of the changes in phonon interactions alone cannot account for the differences in the behaviour of the thermal conductivity of YBa(_2)Cu(_3)O(_6) and YBa(_2)Cu(_3)O(_7). In addition; the model, shows that there must be a significant carrier contribution to the thermal conductivity in both the normal and superconducting states. A physical process has been proposed which provides the required large carrier contribution below T(_c). Further studies have been performed on a series of samples of YBa(_2)Cu(_3)O(_7-δ) which were sintered at slightly different temperatures. Qualitative analysis of the physical properties, of these samples has been performed.

No description available.

No description available.

Poly(methyl methacrylate) (PMMA) and polystyrene (PS), which are fully amorphous polymers, have been extensively studied for over a decade to discover how their mechanical behaviours vary with temperatures and strain rates. In this study, Mechanical tests were carried out at a range of strain rates and temperatures using a Hounsfield H50KM Test Machine wluch provides quasi- static rates (10-4 - 10-3 S-l) and low strain rates (10-2 - 10-1 S-l), and an in-house built Dropweight Machine which provides high strain rates (102 - 103 S-l) Mechanical tests were also performed in a high-speed photographic system, which provides high strain rates (103 S-l), to visualise the deformation of the polymers at a range of temperatures. An aluminium-heating block was built to heat up the samples to the required temperature. Strain limited tests were carried out at a range of strain rates and temperatures. Differential Scanning Calorimetry (DSC) was employed to study the glass transition temperatures and the specific heats of the samples. Dynamic Mechanical Thermal Analysis (DMTA) was adopted to study the transitions in the samples and the change of moduli with temperature densities of samples before and after high strain rate compression at certain strain were measured using a Six Column Density Apparatus The polarising microscope was used to study the orientation of the polymer chains at a range of temperatures, strains and strain rates. Eyring's theory of viscous flow was applied on yield point, 20% and 30% strain to relate the activation energy and volume with strain rate and temperature from the thermodynamic perspective. Temperature rise was calculated for high strain rate data to fit into the isothermal curve for the application of Eyring's theory and to obtain the actual smnple temperature at which the deformation took place. PMMA and PS showed ductile behaviour when tested at quasi-static and low strain rates at temperatures below their ductile-brittle transition temperatures. The densities of samples were not found to increase at different strains. The orientations of polymer chains did not influence the increase at Yield stress at high strain rates. The interpretation of activation energy and volume provided information of how the flows of chains took place at different temperatures and strain rates.