identifier: Sinha, Bakshi Vidyanand <https://research.library.mun.ca/view/creator_az/Sinha=3ABakshi_Vidyanand=3A=3A.html>   (1978) The low frequency microwave spectra of ¹⁴NH₃ and carbonyl sulphide.  Masters thesis, Memorial University of Newfoundland.

abstract: Fifteen new ground state inversion lines of ¹⁴NH₃ were observed at 80° to 90°C, accurately measured and assigned. The electric dipole moment computed from the Stark shifts is 1.472 ± 0.002 D, which compares well with the value 1.475 ± 0.0006 D reported recently by Fujoi Shimizu. Corrections were applied to K = 3 and K = 6 lines. -- Nine 0→1 rotational transitions of Carbonyl Sulphide, including one Fermi pair and one triplet due to quadrupole interaction of ³³S nucleus were observed, accurately measured and assigned. The relative electric dipole moments of OCS in the (10⁰O) and (02⁰O) states and those of ¹⁸OCS, O¹³CS, OC³³S and OC³⁴S in the ground state were computed from the Stark shifts. The relative electric dipole moments for O¹³CS and OC³⁴S are respectively 1.0057 and 1.0155. -- A new technique to distinguish and shift the reflection resonances within the guide from the absorption lines of the gas was developed and successfully employed.


identifier: Earle, Arthur Graham <https://research.library.mun.ca/view/creator_az/Earle=3AArthur_Graham=3A=3A.html>   (1974) The microwave spectra of tertiary butyl chloride and tertiary butyl bromide.  Masters thesis, Memorial University of Newfoundland.

type: Thesis NonPeerReviewed

format: application/pdf application/pdf

abstract: The microwave spectra of tertiary butyl chloride and tertiary butyl bromide were observed in the 8 to 12.4 GHz region using a Stark effect spectrometer with a 100 KHz square wave modulation. The absorption cell was a ten-foot section of S-band wave guide with a flat Stark electrode in the center of the guide and parallel to the broad side. -- All rotational transitions took place at the dry-ice temperature with the ground vibrational state being most dominant. From a partial resolution of the nuclear quadrupole hyperfine structure the rotational constant B₀ and quadrupole coupling constant eQq were calculated for the two dominant species of each molecule. The centrifugal distortion constants were shown to be very small and no attempt was made to evaluate them. -- The rotational constants B₀ and quadrupole coupling constants eQq were obtained for the for species (C¹²H₃)₃C¹²X, where X was Cl³⁵, Cl³⁷, Br⁷⁹, and Br⁸¹. The value eQq = -52.28 ± 1.25 MHz for the case where X was Cl³⁷ is a new result. The remaining constants were found to be in good agreement with the values obtained previously by Lide and Jen, and Ziel, Winnewisser and Huttner. The transitions in this work involved lower J numbers and frequencies than were used previously, that is, the J=1 → 2 and J=2 → 3 transitions.


identifier: Jain, Rajendra Kumar <https://research.library.mun.ca/view/creator_az/Jain=3ARajendra_Kumar=3A=3A.html>   (1979) The vibrational Raman spectra of the V₁ symmetric mode of liquids methane and carbon tetrafluoride.  Masters thesis, Memorial University of Newfoundland.

abstract: The polarized or isotropic contributions to the totally symmetric V₁ vibrational Raman spectra of methane and carbon tetrafluoride were measured in the liquid phase along the liquid vapour co-existence line from the triple point to the critical point in each case. Attention was focused on three principal characteristics of single component spectra; (1) the line width i.e. the full width at half maximum, (2) the shift in peak frequency relative to that at the triple point and (3) the degree of asymmetry observed in the line shape. Light from Ar⁺ ion laser incident on the sample cell and scattered at 90° was analysed by a Fabry-Perot interferometer and recorded by photon counting systems. In case of methane, the line width remains practically constant from the triple point to the boiling point and increases from the boiling point onwards to the critical point, while in case of carbon tetrafluoride the line width is maximum at triple point and decreases up to the boiling point and afterwards remains constant up to the critical point. The observed variation in line width can be explained on the basis of a hydrodynamic theory of vibrational dephasing due to Hills and Madden. The relative Raman frequency shift has been found to vary linearly with density as previously observed in similar gas-phase experiments. In both the liquids the asymmetry in line shape is observed to be in opposite sense at the triple point to that at the critical point.


identifier: Crawford, Anna M. <https://research.library.mun.ca/view/creator_az/Crawford=3AAnna_M=2E=3A=3A.html>   (1992) A comparison of two inversion methods for determination of sand concentration and size from multifrequency acoustic backscatter.  Masters thesis, Memorial University of Newfoundland.

abstract: RASTRAN (Remote Acoustic Sediment TRANsport measurement) System 1 has been used in laboratory trials and deployed in nearshore locations as part of several field experiments.  The system operates at three frequencies, 1, 2.25 and 5 MHz, over a range of approximately 1 m, with resolution of about 2 cm.  A central concern has been the probable errors in suspended sediment concentration and size derived from the backscatter data.  An inversion algorithm based on the differences in backscattered pressure amplitude at the three frequencies has been developed.  Laboratory experiments, measuring multifrequency backscatter from a turbulent sediment-carrying jet, have been used to calibrate the system and to test the inversion algorithm.  Concentration and sizes inverted from field and laboratory data are compared with results from a previously developed algorithm based on signal ratios.  Inverted concentrations are also compared with Optical Backscatter Sensor (OBS) data collected during the field experiment.  This latest inversion scheme is less sensitive to errors arising from low signal levels, increasing the size/concentration measurement range to regions of lower concentration.  The concentration results agree well with the independent OBS data.


identifier: Gillard, Paul G. <https://research.library.mun.ca/view/creator_az/Gillard=3APaul_G=2E=3A=3A.html>   (1983) Aspects of collision-induced absorption of hydrogen and deuterium.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Induced infrared absorption spectra of hydrogen in the fundamental and second overtone regions and of deuterium in the fundamental and first and second overtone regions were investigated over a wide range of gas densities. The spectra were recorded using a 2 m high-pressure low-temperature absorption cell which was modified by the addition of a vacuum jacket to allow the cell to be cooled by immersion in liquid nitrogen. Many of the spectra were recorded with a microprocessor-controlled data acquisition system designed specifically for this purpose. This device transmitted the data to one of the larger computers on campus for further analysis. -- The hexadecapole-induced U-transitions corresponding to a change of 4 in the rotational quantum number which occur in the high wavenumber wing of the hydrogen fundamental band were studied at a temperature of 77K over a density range 500-900 amagat and an analysis of the absorption profiles was carried out. -- In the fundamental band of deuterium, the weak S+S type double transitions arising from the anisotropy of the polarizability were studied at 77K. Induced spectra of deuterium in the first overtone region were studied at 77, 201 and 295K at gas densities in the range 100-450 amagat. The spectrum appears to have no contribution from the short-range electron overlap interaction, and the observed and theoretically predicted intensities for the individual components of the spectrum are not in good agreement. However, an “improvement factor” proposed for the available theoretical matrix elements of the quadrupole moment of deuterium produces good agreement between the observed and calculated profiles.  The anisotropic S+S type transitions in the first overtone region were also studied at 77K for densities in the range 500-850 amagat. A distinct narrowing of the halfwidth of the spectral lines as a function of density was greater than 300 amagat at 77K. -- Induced spectra of both hydrogen and deuterium in the second overtone regions were recorded at 77K at densities in the range 500-930 amagat. In these spectra there is clear evidence of the contribution from the short-range overlap interaction. Transitions of the S+S type were also observed in the region of the 3-0 band of hydrogen. In the spectral region of the 3-0 bands the agreement between the observed intensities and the corresponding theoretically calculated values was rather poor.


identifier: Gammon, Peter Henry <https://research.library.mun.ca/view/creator_az/Gammon=3APeter_Henry=3A=3A.html>   (1981) Brillouin spectroscopic studies of the elastic properties of artificial and natural ice samples.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The method of Brillouin spectroscopy has been used to measure the dynamic elastic moduli of local homogeneous regions in ice samples representing four different environments of formation. These included artificial ice frozen from distilled water, clear monocrystalline glacial ice, bubbly lake ice and sea ice. Results show Brillouin spectroscopy to be an effective technique for accurately measuring the small scale elastic properties (between inclusions) of natural ice samples. – The four samples studied were found to have identical microscopic elastic properties, that is, the respective measured sets of elastic moduli showed agreement within experimental uncertainty. Accordingly, the elastic properties of homogeneous monocrystalline ice have been found not to vary with sample age, with impurities present at the time of freezing or with crystal quality. The bulk elastic properties of ice remain of course, subject to modification by differing crystal grain textures and by the presence of inclusions of various sorts. – Weighted mean adiabatic elastic moduli for homogeneous mono-crystalline ice (equivalently, local regions in polycrystalline or heterogeneous ice) have been calculated from the combined Brillouin spectroscopic data for the four types of samples. The values at -16°C were determined to be c₁₁ = 139.25 ± .41, c₁₂ = 70.82 ± .39, c₁₃ = 57.65 ± .23, c₃₃ = 150.10 ± .46, c₄₄ = 30.14 ± .11 (units of 10⁸ N/m² or kbar). A simplified linear temperature correction relation for the elastic moduli has been determined from Brillouin data obtained at -3°C and at -16°C. A full range of derived elastic parameters for monocrystalline ice and for homogeneous isotropic polycrystalline ice has been calculated. – The values for elastic moduli obtained in the present work are subject to smaller overall uncertainty than are values obtained by previous authors. Agreement of the present results with previous measurements is generally good but not in all cases within experimental uncertainty.  Unnoticed systematic error in previous measurements provides the most probable explanation for the discrepancies. However, variation of elastic moduli induced by unusual sample preparation techniques cannot be entirely ruled out. Prior to the present application of Brillouin spectroscopy no single technique for measuring the elastic moduli of ice has been applied in a uniform manner to ice samples from several sources. Hence, the present results are unique in that their applicability to ice from a wide range of sources has been experimentally verified. – In a departure from the primary objective of the Brillouin spectroscopic studies (measurement of elastic moduli) the method has also been used to investigate the local acoustic properties of the crystal grain boundary region in a bicrystalline sample of river ice. Spectra from the boundary region showed a distinct and unexpected asymmetry in the Brillouin frequency shifts of the upshifted versus the downshifted longitudinal components. The precise physical processes underlying the observation have not been determined. However, it has been verified that the effect was not instrumental. Interaction between bulk and surface acoustic modes propagating in the grain boundary region appears to provide a plausible line of explanation. Additional theory and experimental work, continuing from the present work can be expected to yield valuable direct information on the structure and physical properties of the crystal grain boundary region in polycrystalline ice.


identifier: Gagnon, Robert <https://research.library.mun.ca/view/creator_az/Gagnon=3ARobert=3A=3A.html>   (1986) Brillouin spectroscopic studies of the elastic properties of ice up to 10 kbar.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The technique of high resolution Brillouin spectroscopy has been used to determine accurately, and for the first time, the hydrostatic pressure dependence of the elastic constants of ice Ih in the full pressure range of phase stability and metastability, 0-2.8 kbar, at -35.5°C. The temperature dependence of the elastic constants has also been determined in the temperature range -4°C to -35°C. -- A thermoelectrically cooled cryostat and a 10 kbar optical cell were constructed to house rotatable cylindrical specimens. Samples were prepared from large single crystals of Mendenhall glacial ice. Prior to the laser scattering experiments the c-axis orientations of the monocrystalline specimens were determined to within 0.5° by a unique optical birefringence device. -- The elastic constants were determined by analyzing the Brillouin frequency shifts as a function of crystal orientation. The absolute zero pressure values agreed to about 1% with other Brillouin spectroscopic studies of ice Ih. The percentage changes in the elastic constants c₁₁, c₁₂, c₁₃, c₃₃, c₄₄ and bulk modulus over the full pressure range, are 3.0, 7.4, 8.0, 2,8, -1.5 and 5.1 percent per kbar respectively. The negative pressure dependence of c₄₄, which is softening of the shear modes, indicates decreasing crystal stability as the phase transition to ice III (at ~3 kbar) is approached. -- Longitudinal and transverse acoustic velocities have also been determined for isotropic, finely polycrystalline, aggregates of four high pressure ice phases. The bulk moduli (±5%) derived from the velocity data, for ice II, III, V and VI are 138.9, 98.7, 141.9 and 181.4 kbar respectively. -- To obtain ice densities, so that refractive indices could be calculated for use in the Brillouin equation, a technique has been developed whereby the variation of sample volume with pressure has been measured directly in the pressure range 0-10 kbar. Isothermal bulk moduli derived from this data agree to within 5% with the adiabatic values calculated from the velocity data. -- A scheme has been worked out to classify the various ice phases, based on knowledge of the hydrogen bonds, which can qualitatively explain the observed velocity data and can furthermore be used to predict approximate velocities for phases for which no velocity data presently exist. -- There is excellent agreement between the present longitudinal velocity results and other published data. There are discrepancies between previous and present shear wave velocity results, however. The present values appear to be more accurate, at the pressures of the midpoints of the phases at least, as indicated by the consistency of the values for the bulk moduli derived using the present density data and the present velocity data.


identifier: Andrews, Gordon Todd <https://research.library.mun.ca/view/creator_az/Andrews=3AGordon_Todd=3A=3A.html>   (1992) Brillouin spectroscopic studies of the orientationally disordered phase of C₂F₆.  Masters thesis, Memorial University of Newfoundland.

abstract: The elastic constants and elasto-optic coefficient ratios of the orientationaIly disordered β-phase of C₂F₆ have been determined using the technique of high resolution Brillouin spectroscopy. Just below the triple point, at 169K, the values of the elastic constants (in units of kbar) are: -- C₁₁ =  26.9 ± 0.10, -- C₁₂ = 19.32 ± 0.10, -- C₄₄ = 4.44 ± 0.04. -- The elasto-optic coefficient ratios at 169K are: -- ρ12/ρ11 = 1.09 ± 0.09, -- ρ44/ρ11 = 0.12 ± 0.01. -- The temperature dependence of all three elastic constants was also determined over the range 169K to 144K. C₁₁ and C₁₂ appear to have linear temperature dependences, with ΔC₁₁/ΔT = -.335 ± 0.010 kbar/K, and ΔC₁₂/ΔT = -0.236 ± 0.010 kbar/K. C₄₄, however, appears to be independent of temperature in this range, with ΔC₄₄/ΔT = 0.005 ± 0.011 kbar/K. -- Values of the  ratios of acoustic velocities in high symmetry directions in the crystal indicate near perfect elastic isotropy and that moderately strong rotation-translation coupling is present in β-C₂F₆. The extent of the coupling is of the order of that observed in plastic (CH₂CN)₂. This is in contrast to the structurally similar orientationally disordered phase of SF₆, which behaves elastically like a rare gas solid.


identifier: He, Cheng <https://research.library.mun.ca/view/creator_az/He=3ACheng=3A=3A.html>   (1991) Broadband measurements of the acoustic backscatter cross section of sand particles in suspension.  Masters thesis, Memorial University of Newfoundland.

abstract: Please see thesis for abstract.


identifier: Xiang, Fan <https://research.library.mun.ca/view/creator_az/Xiang=3AFan=3A=3A.html>   (1992) Collision-induced absorption spectra of molecular hydrogen in the second overtone region at 77, 201 and 298 K.  Masters thesis, Memorial University of Newfoundland.

abstract: The collision-induced absorption spectra of molecular hydrogen in its second overtone region were recorded with a ~ 2.0 m high-pressure low-temperature absorption cell for gas densities up to 1000 amagat at 77, 201 and 298 K. The occurrence of the dip at Q₃(1) with characteristic low- and high- wavenumber components Qp and Qr, observed for the first time in the 3-0 band at different temperatures, clearly shows the contribution of the short-range electron-overlap interaction of the collisions to the 3-0 band in contrast to the 2-0 band of H₂. In addition to the overlap components, the observed spectra consist of the long-range quadrupole-induced transitions of the type Q₃(J)+Q₀(J), S₃(J)+Q₀(J), Q₃(J)+S₀(J), Q₂(J)+Q₁(J), S₂(J)+Q₁(J), Q₂(J)+S₁(J) and S₂(J)+S₁(J), where the subscripts 0 to 3 indicate Δv, the change in the vibrational quantum number. -- An analysis of the observed profiles was performed by using the Levine-Birnbaum intracollisional line-shape function [Phys. Rev. 154, 86 (1967)] and the Van Kranendonk intercollisional line-shape function [Can. J. Phys. 46, 1173 (1968)] for the overlap-induced transitions, and the Lorentz line-shape function as well as the Birnbaum-Cohen line-shape function [Can. J. Phys. 54, 593 (1976)] for the quadrupole-induced transitions. Very good agreement between the experimental absorption profiles and the calculated profiles was obtained by reducing the matrix elements of the quadrupolar moment <0J|Q|v’J’> for Δv= 2 and 3 by a factor 0.68 and by treating the relative intensities of the three groups of transitions, namely, the overlap transitions, the quadrupolar single transitions and the quadrupolar double transitions, as independent parameters. From this analysis the characteristic half-width parameters δa and δc for the overlap components, δq of the Lorentz line-shape function, and δ1 and δ2 of the Birnbaum-Cohen line-shape function for the quadrupole components have been determined. -- The analysis of the profiles described above reveals some excess absorption in the band around 12,460 cm⁻¹. As the area under the absorption profile of this excess absorption is found to be proportional to the cube of the density of H₂, it is interpreted as arising from the triple transitions Q₁(J)+Q₁(J)+Q₁(J). This represents the first observation of simultaneous transitions involving three molecules in collision-induced spectra. Profiles resulting from the triple-collision transitions were also analyzed satisfactorily by using the Lorentz line-shape function as well as Birnbaum-Cohen line-shape function.


identifier: Halide, Halmar <https://research.library.mun.ca/view/creator_az/Halide=3AHalmar=3A=3A.html>   (1992) Determining flow field singularities from drifter trajectories.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis is concerned with techniques for determining the properties of singularities in the flow field. Okubo and Ebbesmeyer (1976) and Molinari and Kirwan (1975) developed a regression technique that has become a standard for determining velocity gradients of the flow field. Kirwan (1988) has pointed out that this regression technique is fundamentally inadequate because is assumes a paradigm with the flow centre fixed to the centroid of the drifter cluster. Kirwan et al., (1988) formulated a solution to this dilemma by inverting non-linear solutions obtained by Okubo (1970) for motion near a flow field singularity with specified differential kinematic properties (DKP). The DKP are horizontal divergence, vorticity, stretching and shearing deformation rate. We solve the non-linear equations of Kirwan et al., (1988) to obtain DKP and the position and velocity of a flow field singularity from a single drifter trajectory. This solution (henceforth called the OK solution) is mathematically more concise than that presented in Kirwan et al., (1988) and corrects previously undetected algebraic errors in the published literature. It has been successfully tested using artificially generated data. The method is fundamentally limited due to the requirement that DKP are time invariant. It also has the undesirable feature that it requires fourth order time derivatives of data. A new method, the HS method, that uses regression without artificially setting a flow centre to the cluster centroid is presented. It has also been successfully tested by application to artificially generated data. The DKP are successfully recovered by the HS providing all drifters in the cluster are being moved by the same unique singularity in the flow field. -- Applying all three methods to three neighbouring drifter tracks measured on Sable Island Bank clearly indicated the limitations of all three methods. The regression technique Okubo and Ebbesmeyer (1976), the OE method, ‘failed’ because the flow centre was not at the cluster centroid position. The OK method gives ambiguous results in that it can not distinguish between solid body rotation about a point and a slab that oscillates. The lack of a single well defined flow centre for all three drifter trajectories was sufficient to ensure the HS method gave meaningless DKP that had large intermittent fluctuations. Nevertheless, given trajectories near a well-defined flow field singularity, we can be assured that both the HS and OK method can be used to obtain the position, velocity and SKP of the singularity. Depending upon the separation scales of the drifters, the HS method can be much less or more sensitive to noise than the OK method.


identifier: Luo, Hongda <https://research.library.mun.ca/view/creator_az/Luo=3AHongda=3A=3A.html>   (1990) Light scattering in binary gas mixtures : evidence of fast and slow sound modes.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis Brillouin scattering data are presented for three different binary gas mixtures composed of species with  widely different masses, i.e. Ar + H₂(mAr/mH₂ ≃20), SF₆ + CH₄ (mSF₆/mCH₄ ≃ 9), and SF₆ + H₂(mSF₆/mH₂ ≃73). Under the experimental conditions predicted by the theory a fast sound  mode contribution to the light scattering spectra of Ar + H₂ mixtures has been detected. Unlike the ordinary sound mode the fast sound mode propagates only in the light component with a velocity higher than that obtained using hydrodynamic  theory. However, the attempts to observe the same effect in mixtures of SF₆ + CH₄ under similar conditions were unsuccessful. An analogous slow sound mode contribution to the spectra of SF₆ + H₂ mixtures has been clearly identified and it was found this mode was, in general, much easier to detect. -- A new parameter called the effective mean free path was also introduced in order to obtain a more consistent characterization of the dynamical behavior in binary mixtures with disparate masses.


identifier: Liu, Ming-hui <https://research.library.mun.ca/view/creator_az/Liu=3AMing-hui=3A=3A.html>   (1992) Experimental study of convection of a binary fluid in a quasi-1-dimensional cell.  Masters thesis, Memorial University of Newfoundland.

abstract: Rayleigh-Bénard convection in binary fluids has been studied  widely in recent years due to the richness of instability phenomena observed. With properly chosen parameters, the first, bifurcation from conduction to convection can be to a  traveling wave (TW) state, and there is then a second transition from the TW state to a stationary overturning convection (SOC) state. In this thesis, we report on an experimental study of TW and SOC states in ethanol-water mixtures in a narrow rectangular cell. The flow is visualized using the shadowgraph technique. By comparing our  recorded shadowgraph intensity profiles with recent numerical results [13], we studied the temperature and concentration fields in the convective flow, both in the TW and SOC states. While our results confirm some of the qualitative features of the numerical results, there appear to be some significant differences which may be due partly to the narrow geometry of the experimental cell.


identifier: Prasad, Chintalapati V.V. <https://research.library.mun.ca/view/creator_az/Prasad=3AChintalapati_V=2EV=2E=3A=3A.html>   (1987) Electronic emission spectra of ¹²C ¹⁶O, ¹³C ¹⁸O, ¹³C ¹⁸O⁺, and ¹⁵N₂⁺.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: A hollow-cathode discharge tube of special design with physical separation of the anode and cathode columns was used to excite the neutral molecules ¹²C¹⁶O and ¹³C¹⁸O and the molecular ions ¹³C¹⁸O⁺ and ¹⁵N₂⁺. The initial experiments have demonstrated that the cathode glow is an excellent source of molecular ions as well as neutral molecules in their high-lying excited states while the anode glow contains almost exclusively the neutral molecules. The excited spectra were recorded on medium and high resolution optical spectrographs. -- Six bands of the Herzberg (C¹∑⁺ - A¹π) system of ¹³C¹⁸O in the spectral region 3660 - 4190 Å were observed for the first time and the rotational structure of five of them was analyzed. Perturbations observed in the v = 3  and 5 levels of state A were analyzed  and information concerning the perturbing states was obtained. -- In a reinvestigation of the third positive (b³∑⁺ - a³πr) system and the three Kaplan bands (which have  not been understood since their first observation in 1930) of ¹²C¹⁶O in the region 2500 - 3830 Å, five new bands of this molecule were observed in the present work. The Kaplan bands and the five new bands are now assigned to a v"- progression with v' = 2 of the third positive system. The new vibrational assignments are confirmed from the calculated Franck-Condon factors and from the experimental data of the corresponding bands of ¹³C¹⁸O, observed for the first time. With the identification of the v = 2 level in state b of CO, the controversy regarding the dissociation limit of CO existing in the literature is now satisfactorily  resolved. -- Three bands of the Baldet-Johnson (B²∑⁺ - A²πi) system in the region 3700 - 4225 Å and seven bands of  the comet-tail (A²πi - X²∑⁺) system in the region 3620 - 6165 Å, of ¹³C¹⁸O⁺, were rotationally analyzed for the first time. -- Of the fifteen bands observed in the first negative  (B²∑u⁺ - X²∑g⁺), system of ¹⁵N₂⁺, in the region 3570-5170 Å, twelve bands were rotationally analyzed. Perturbations observed in the v = 0 level of state B were analyzed and was  found to be perturbed by the v = 25 level of the A²πi,u state of ¹⁵N₂⁺. In all these investigations, with the exception of third positive system of CO (for which only the  vibrational analysis was performed), final molecular constants of various electronic states involved were obtained by the method of "merging."


identifier: Davidson, Fraser J.M. <https://research.library.mun.ca/view/creator_az/Davidson=3AFraser_J=2EM=2E=3A=3A.html>   (1994) Modelling advection of cod eggs & larvae on the Newfoundland shelf.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis I investigate the drift and retention of cod eggs and larvae on the Newfoundland Shelf using two different mathematical methods. The first is an analytical model that solves the advection-diffusion equation for a patch of larvae in a spatially homogeneous, time-dependent current for the proportion of larvae retained on the shelf. We show that there is a weak correlation between retention of larvae and recruitment of northern cod. Furthermore, we demonstrate the sensitivity of retention to location of the larvae relative to the shelf break. -- In the second method we use a two-dimensional velocity field to study the interannual variations of cod egg and larval dispersion on the Newfoundland and Labrador shelf. This model uses a steady state mean flow derived from a diagnostic calculation  of objectively analysed density data for the Northeast Newfoundland Shelf. Time-dependent currents are generated using a slab model driven by observed winds, following the approach of Pollard-Millard (1970). We study the advection of the eggs and larvae using numerical Lagrangian drifters seeded throughout the Newfoundland Shelf region. We identify  favourable and unfavourable zones of retention on the Newfoundland shelf. We show that northerly, shelf break spawning locations are more favourable than southerly shelf break spawning locations for northern cod (Gadus Morhua in NAFO divisions 2J3KL).


identifier: Xu, Jie <https://research.library.mun.ca/view/creator_az/Xu=3AJie=3A=3A.html>   (1992) Diagnosing changes in the North Atlantic circulation using a vertical section model.  Masters thesis, Memorial University of Newfoundland.

abstract: A two-dimensional vertical section model is described.  The model takes density data along a section as input and calculates the velocity through the section referenced to the bottom.  We have used it to analyse changes in the circulation of the North Atlantic by taking as input the objectively analysed density data of Levitus(1982,1989) for the climatological annual mean and for the pentads 1955-59 and 1970-74. -- Sections along 55.5°W, 64.5°W, 54.5°N and 23.5°N have been considered and estimates of the poleward heat transport through 54.5°N and 23.5°N have been made.  Ekman transports are calculated using the Hellerman and Rosenstein(1983) wind stress field and wind stress analysed by da Silva and Levitus for the period 1945-1989.  At 54.5°N, mass balance is achieved by combining with the absolute transport calculations of Greatbatch et al.(1991), giving values for the poleward heat transport of 0.6PW, 0.7PW and 0.5PW for the climatological annual mean and the pentads 1955-59 and 1970-74, respectively.  The estimated error is ±0.2PW.  These values compare well with previous estimates obtained using surface heat flux calculations and suggest that the poleward heat transport in 1970-74 may have been marginally less than in 1955-59.  We have performed a similar calculation for 23.5°N, this time by requiring mass balance through the section assuming that the northward transport and flow temperature of the Florida Current was the same in each pentad and equal to the climatological annual mean value, an assumption we believe to be justified.  The calculated heat transports are 1.2PW, 1.0PW and 0.8PW for the climatological annual mean and the pentads 1955-59 and 1970-74, respectively, with an error of ±0.3PW.  The climatological value agrees with previous estimates at this latitude and there is again the suggestion that the 1970-74 value is less than the others, particularly in comparison with the climatological annual mean.  Along 54.5°N, the reduced heat transport in 1970-74 is attributed to a deeper North Atlantic Current and a warmer return flow in the Labrador Sea.  Along 23.5°N, on the other hand, the southward flow over the interior of the North Atlantic is more surface confined in 1970-74 than in the climatological case. -- Other results concern the vertical distribution of the absolute transport changes diagnosed by Greatbatch et al.(1991).  Along 55.5°W, the transport of the Gulf Stream referenced to the bottom was some 30Sv less in 1970-74 than in 1955-59, a change comparable in magnitude to that found by Greatbatch et al.(1991).  However, the maximum change found by Greatbatch et al. is displaced to the south of that referenced to the bottom, indicating the importance of changes in bottom velocity.  Greatbatch et al. also considered a case in which the density below 1500 m is assumed to have remained unchanged between the pentads, and diagnosed a transport change for the Gulf Stream of over 20Sv.  On the other hand, the change in transport referenced to and above 1500m is only 7Sv, indicating that even in this case, changes in bottom velocity play an important role.  There is a suggestion in the model results that in the 1970-74 pentad, the northern recirculation gyre of the Gulf Stream was weaker than in both 1955-59 and the climatological case.


identifier: Jerrett, John Mark <https://research.library.mun.ca/view/creator_az/Jerrett=3AJohn_Mark=3A=3A.html>   (1992) Fingering instability of a gravitationally driven contact line.  Masters thesis, Memorial University of Newfoundland.

abstract: Presented here are the results of an experimental study of the flow of a viscous fluid sheet down a dry inclined plane.  The three-phase contact line at the front of the flow is initially straight but becomes unstable to a roughly periodic variation in its downslope position when the sheet becomes thin enough. From measurements of the contact line position as a function of time for angles α in the range 0° < α < 55°, the flow is analyzed both before and after the instability occurs, and the development of the finger pattern is parameterized. These results are compared with those found in previous experiments and those predicted by theory.


identifier: Rendell, Jennifer M. <https://research.library.mun.ca/view/creator_az/Rendell=3AJennifer_M=2E=3A=3A.html>   (1989) Solutions of the steady-state Landau-Ginzburg equation in external driving fields.  Masters thesis, Memorial University of Newfoundland.

abstract: A steady state equation derived from the variation with respect to the order parameter M(x) of a Landau-Ginzburg free energy density of the form -- [special characters omitted] -- is considered, where h ≠ 0, C ≥ 0, D ≠ 0 is a second rank tensor. This is a generalization of prior work by Winternitz et al. [J.Phys. C 21 4931-4953 (1988)], who studied the case h = 0 and C = 0. Applied to a magnetic system, it describes the behaviour of the magnetization of a  critical system in the presence of an external magnetic field h and near a structural phase transition. The Landau coefficients A, B, and C are weakly temperature dependent, but are considered constant near the transition temperature Ttr (the Curie point in magnetic systems), except for A α (T  — Ttr). The gradient term allows for spatial inhomogeneities  due to nearest neighbour interactions. Two cases are examined: C = 0 (B > 0) and C > 0 (B < 0) which correspond to second and first order phase transitions, respectively. The symmetries of the equation arc exploited by the symmetry  reduction method to find exact solutions in terms of varied symmetry variables. These solutions are in the form of kinks, bumps, singular, periodic, and doubly periodic solutions. The physical interpretation of these results and other calculations (e.g. energy, susceptibility) based on these results is discussed.


identifier: Sheng, Jinyu <https://research.library.mun.ca/view/creator_az/Sheng=3AJinyu=3A=3A.html>   (1986) Sound scattering and attenuation in aqueous suspensions of sand : comparison of theory and experiment.  Masters thesis, Memorial University of Newfoundland.

abstract: Theoretical estimates of scattered acoustic intensity and attenuation coefficient are compared with all available data  for aqueous suspensions of sand, for both bistatic and monostatic systems. This appears to be the first comparison of theoretical and experimental attenuation coefficients in suspensions of mineral grains at wavelengths comparable to or less than the scatterer circumference, and it is shown that as far as the existing data are concerned, this comparison is crucial. Three theoretical models are used, in  which the scatterer is assumed to be either elastic, or completely rigid, or both rigid and immovable. The rigid movable model with a Gaussian size distribution provides the  best fit to the data. The failure of the elastic model indicates that resonance excitation does not occur, probably  because natural sand grains are irregularly shaped and inhomogeneous in composition. The rigid immovable model fits  the data the least well, indicating that the inertia of the particles is important. Approximate expressions for the form  factor and attenuation coefficient have been constructed, based on the so-called high-pass model introduced by Johnson  [1977]. The high-pass model provides a fit to the data which  is as good as the rigid movable case. Multiple scattering is  discussed briefly, and approximate estimates of the correction for multiple scattering are made. In addition, the geometry of scattering and attenuation in suspensions for bistatic systems is analyzed for the narrow beam case, and approximate analytical expressions for the detected volume and scattered intensity are obtained.


identifier: MacIsaac, Allan B. <https://research.library.mun.ca/view/creator_az/MacIsaac=3AAllan_B=2E=3A=3A.html>   (1992) Monte Carlo study of the two-dimensional dipolar ising model.  Masters thesis, Memorial University of Newfoundland.

abstract: The two-dimensional Ising model with a dipolar and superexchange interaction will be examined. This model will be studied using Monte Carlo simulations. The results of this study will be discussed in two ways. First, the results  will he analysed treating the system as a possible model for  the rare earth ordering in the compounds REBa₂Cu₃O₇, where RE  one of the Kramers rare earth ions. A comparison between the  Néel temperature of a pure dipolar system and the experimental Néel temperature of these compounds will be done. As well, the results will be analysed in terms of what  may be learned about dipolar systems in general. In particular, the Néel temperature and the static critical exponents will be discussed.


identifier: Klein, Ken <https://research.library.mun.ca/view/creator_az/Klein=3AKen=3A=3A.html>   (1995) Near field acoustic and vibration studies with a cantilever beam.  Masters thesis, Memorial University of Newfoundland.

abstract: Several acoustic investigations were conducted with the near  field radiated from a vibrating cantilever beam. -- The objective of the first investigation was to experimentally determine the spatial distribution of acoustic intensity close to the beam. Difficulties that occur with acoustic intensity measurements made this a non trivial task and led to the development of an experimental procedure for mapping the spatial distribution of acoustic intensity in the near field. The mapping procedure combined the physics of a closed surface with approximations from an analysis with Taylor's series. The method was successfully tested on the field radiated by the beam. It was then shown that the reliability of the spatial distribution of intensity that resulted from this method could be statistically evaluated from the measured data alone without making assumptions about the nature of the acoustic field. -- A second experimental investigation demonstrated the practicality of constructing acoustic intensity with transfer functions. The  expression for acoustic intensity, normally formulated in terms of acoustic pressures, was expressed in terms of transfer functions between pressures and the force exciting the cantilever beam. -- In the third and last investigation,  the source of the acoustic field, the cantilever beam, was modelled with Euler-Bernoulli theory. Elements of modal analysis were used to obtain the modal parameters of the beam and a value for Young's Modulus for the material of the  beam. This vibration model was then used in an integral approximation for the acoustic field close to the beam. The acoustic near field was calculated and compared with experimental measurements. The results were used to examine the distribution of phase in the near field as it pertained to the measurement of acoustic intensity.


identifier: Haridass, Chandran <https://research.library.mun.ca/view/creator_az/Haridass=3AChandran=3A=3A.html>   (1990) The electronic band systems of ¹²C¹⁶O⁺.  Masters thesis, Memorial University of Newfoundland.

title: The electronic band systems of ¹²C¹⁶O⁺

abstract: The electronic band spectrum of the molecular ion ¹²C¹⁶O⁺ is of considerable importance to astrophysics as this species is one of the major constituent of the solar chromosphere, stellar atmospheres, and comet tails. It has also application in the study of radiative heating of hypersonic space craft at escape velocity and in the atmospheric fringe  of the planet Venus. -- The molecular ion C0⁺ was excited in  a hollow-cathode discharge tube of special design (S. P. Reddy and C. V. V. Prasad, J. Phys. E. Sci. Instrum. 22, 306  (1989)). The comet-tail (A²πi - X²∑⁺) band system of this molecular ion occurring in the cathode glow of the discharge  tube was photographed in the spectral region 3345 - 8500 Å on a 2 m Bausch and Lomb dual-grating spectrograph in the first order of a 600 grooves/mm grating under medium resolution. Spectra were also recorded under high resolution  on the same spectrograph in the second and third orders of a  1200 grooves/mm grating as well as on a 3.4 m Jarrell-Ash Ebert grating spectrograph in the second, third, and fourth orders of a 1200 grooves/mm grating. Of the seventeen bands with v' = 0 to 8 and v" = 0 to 4 recorded in this system, detailed rotational analysis of twelve (6-0, 4-0, 3-0, 2-0, 1-0, 2-1, 1-1, 0-1, 2-3, 0-2, 0-3, and 0-4) bands have been carried out. Rotational constants were obtained for the A²πi  and X²∑⁺ states using the effective Hamiltonian proposed by Brown and his co-workers (J. M. Brown et al., J. Mol. Spectrosc. 74, 294 (1979)). -- Experimental data on the rotational structure of the first negative (B²∑⁺ - X²∑⁺) system (Rao, Astrophys. J. 111, 50 (1950) and Misra et al., J. Mol. Spectrosc. 125, 54 (1987)), the Baldet-Johnson (B²∑⁺ - A²πi) system (Jakubek et al., Can. J. Phys. 65, 94 (1987)), and the microwave spectrum of the v = 0 level (Sastry et al., Astrophys. J. 250, L91 (1981)) and of the v = 0, 1, and 2 levels (Bogey et al., J. Chem. Phys. 79, 4704 (1983)) of CO⁺ have been reanalysed using the effective Hamiltonian. A single set of molecular constants were then obtained for the X, A, and B states of CO⁺ by the method of a global fit of the molecular constants obtained from the analysis of the comet-tail, Baldet-Johnson and first negative systems and the microwave data. The vibrational constants for these three states were obtained from the band  origin data.


identifier: Wang, Duanxiang <https://research.library.mun.ca/view/creator_az/Wang=3ADuanxiang=3A=3A.html>   (1992) The gamma system of the nitric-oxide isotopomers ¹⁴N¹⁶O, ¹⁵N¹⁶O, ¹⁴N¹⁸O and ¹⁵N¹⁸O.  Masters thesis, Memorial University of Newfoundland.

abstract: The spectra of the gamma (A ²∑⁺ - X²πr) system of the nitric-oxide isotopomers ¹⁴N¹⁶O, ¹⁵N¹⁶O, ¹⁴N¹⁸O and ¹⁵N¹⁸O, excited in the anode glow of a two-column hollow-cathode discharge tube of special design (Reddy and Prasad. J. Phys.  E. Sci. Instr. 22, 306, 1989), were photographed in the spectral region 2140-2730 Å on a 2 m Bausch and Lomb spectrograph under medium resolution and the spectrum of ¹⁵N¹⁸O was also recorded on a 3.4 m Jarrell-Ash spectrograph under high resolution. The spectrum of ¹⁴N¹⁶O was obtained from the natural presence of nitrogen-14 and oxygen-16 of low pressure air in the discharge tube. The spectra of ¹⁵N¹⁶O and ¹⁴N¹⁸O were produced by admitting nitrogen-15 and oxygen-18 into the discharge tube, respectively. The spectrum ¹⁵N¹⁸O was produced by admitting a mixture of nitrogen-15 and oxygen-18 into the same discharge tube. The gamma system has been observed for the first time for ¹⁵N¹⁸O. -- For each of the isotopomers, six bands, namely, 1-0, 0-0, 0-1, 0-2, 0-3 and 0-4, each having four heads P₁₂ee, P₂₂ff/Q₁₂ef, P₁₁ee and P₂₁ff/Q₁₁ef, have been observed. The vibrational structures of the observed bands have been analyzed from the wavenumber data of the band heads of all the isotopomers of NO. In each case ∆G(1/2) of the A ²∑⁺ state and vibrational constants we and wexe of the X²π₃/₂ and X²π₁/₂ components of the ground electronic state have been determined. -- The rotational structure of the individual 0-1, 0-2 and 0-3 bands of the gamma system of ¹⁵N¹⁸O, photographed under high resolution, has been analyzed using the effective Hamiltonian proposed by Brown et al (J. Mol. Spectrosc. 74, 294, 1979) and a unique set of  molecular constants has been obtained by the method of merging. The derived molecular constants in cm⁻¹ of ¹⁵N¹⁸O are: -- A ²∑⁺: ∆G(1/2)=2237.1 -- X²π: we=1819.15; wexe=12.870; Be=1.55644; αe=0.015343; De=4.5574x10⁻⁶. -- Also obtained for the X²π state are the values of Av, ADv, pV, qv for v = 1, 2, and 3 levels.


identifier: Raja, Amruthavalli <https://research.library.mun.ca/view/creator_az/Raja=3AAmruthavalli=3A=3A.html>   (1994) Study of conformational stability and chain flexibility in phosphorus based inorganic polymers using density functional theory method.  Masters thesis, Memorial University of Newfoundland.

abstract: The structure and conformational stability of poly(thionylphosphazenes) and classical poly(phosphazenes) is investigated by modeling single polymer chains with small  mimics. The model compounds are composed of repeat units of the corresponding poly(thionylphosphazenes) and classical poly(phosphazenes). Two of the model compounds of poly(thionylphosphazenes) have hydrogens and two have chlorines as substituents on phosphorus atoms. All model compounds of classical poly(phosphazenes) have only chlorine  substituents on phosphorus atoms. In poly(thionylphosphazenes) the substituents on sulfur may be either fluorine or chlorine. Fully geometry optimized structures and energies of the stable conformations involving rotations around P-N bond are obtained using the density functional theory method. The objective of this work  is to investigate the flexibility of the chain backbones of the corresponding poly(thionylphosphazenes) and classical poly(phosphazenes). It has been found that for all model compounds the non-planar trans-cis conformations have the lowest total energies. The structural and conformational analyses indicate that the rotation around N-P bond leads to  variations in the bond lengths, the SNP, PNP bond angle openings as well as couplings between dihedral angles in different conformations in all model compounds. It was found  that the values of the conformational energy differences for  poly(thionylphosphazenes) range between 0.6 to 5 kcal/mole and for classical poly(phosphazenes) 0.3 to 1 kcal/mole. The  effects of the sulfur and different substituents of sulfur, on conformational stability are discussed. The plots of radial density distribution function, D(r)=Aπr²p(r) computed  from the spherically averaged numerical density are presented and analyzed. Using the spherically averaged total  electron densities it is shown that the charge along the backbones of the model compounds is partially demoralized and accumulates primarily on the nitrogen atoms. The conformational analysis results will he correlated with the experimentally obtained glass transition temperatures.


identifier: Yan, Zongchao <https://research.library.mun.ca/view/creator_az/Yan=3AZongchao=3A=3A.html>   (1990) Study of elastic and inelastic electron and positron scattering from metastable hydrogen in the Glauber and Wallace approximations.  Masters thesis, Memorial University of Newfoundland.

abstract: The differential cross sections for the elastic and inelastic scattering of electron and positron from hydrogen in the metastable 2s state (2s-2s, 2s-2p, 2s-3s, and 2s-3p) are calculated by using the Glauber and Wallace approximations, at several intermediate energies (from 50 eV to 400 eV).  For the correction term of the Wallace amplitude the three-dimensional integral expression is adopted in the calculation.  We also make some comparison between electron and positron scattering processes from the metastable 2s state of hydrogen and processes from the ground state (1s-1s, 1s-2s, 1s-2p, 1s-3s, and 1s-3p), revealing some significant difference in their relative behaviors.


identifier: Yuan, B. J. <https://research.library.mun.ca/view/creator_az/Yuan=3AB=2E_J=2E=3A=3A.html>   (1989) Proximity effect of the superconductivity in metallic superlattices and a self-similar multilamellar system.  Masters thesis, Memorial University of Newfoundland.

abstract: In the thesis, the various theories of inhomogeneous superconductivity based on Gor'kov's equations(Chapter 2) are reviewed including de Gennes-Werthamer theory and Eilenberger equations as well as their applications to study  the proximity effect of a bilayer system. McMillan's tunnelling model is also introduced. The characteristics of the thickness dependence of the transition temperature Tc in   the thin film limit from the above theories are discussed and will be compared with the results from our calculation. -- The superconductivity of a superlattice consisting of alternating superconducting and normal layers has been investigated(Chapter 3) by means of the Bogoliubov equation.  A relation, which determines the transition temperature Tc, is obtained from the self-consistency equation of the order parameter. The analytical expression of the dependence of the transition temperature Tc on the thickness of a superconducting layer in the thin film limit has been obtained through an analysis of the equation and the comparison with the results from the other theories discussed in Chapter 2 has been done. A periodic energy-momentum relation reflecting the periodicity of the structure has been obtained which gives rise to the basis for any further calculation for the presence of an external magnetic field or a finite order parameter. -- In Chapter 4,  we applied the Werthamer theory to a quasi-periodic geometry  with a fractional dimension D. We build the recurrence relation of the coefficients in the linear fractional transformation in terms of the self-similarity of the geometry, which provides a systematic method to deal with the complicated boundary conditions. The dependence of the transition temperature on both the thickness of the superconducting layer and fractional dimension D has been obtained by the scaling argument in some limiting cases. The  scaling argument is also extended to the case of the presence of a perpendicular magnetic field. The numerical calculation for transition temperature as a function of the thickness is completed and shown in the corresponding figures. We also calculate certain values of Tc corresponding to the given parameters, such as dimension D, thickness ds and coherence length ξ||(0), used in the experiment and compare the theoretical results from the calculation with the experimental values. The result of the comparison is satisfactory and the discrepancies ranging from 2% → 10%, consistent with the Werthamer theory.


identifier: Cho, Carolyn <https://research.library.mun.ca/view/creator_az/Cho=3ACarolyn=3A=3A.html>   (1987) Non-equilibrium thermo field dynamics and the transport of electrons in magnetic and electric fields.  Masters thesis, Memorial University of Newfoundland.

abstract: The superoperator formalism of non-equilibrium Thermo Field Dynamics is extended to consider a system of electrons in contact with a thermal reservoir in a homogeneous crossed electric and magnetic field.  Particular attention is paid to the role of gauge invariance.  A brief overview of the development of a non-equilibrium, finite time, temperature dependent field theory is included, as well as an outline of the construction of the superoperator formalism of non-equilibrium thermo field dynamics.  The relationship between the two point electron Green's functions and the probability distribution function appearing in the semi-classical Boltzmann equation is established. -- As an illustration of how the transport coefficients are found from the Boltzmann equation, the case of the Chamber's solution for the electrical conductivity is considered.  The position dependence of the conductivity tensor in the presence of a domain wall is evaluated numerically, and the trends are verified analytically. -- Future extensions of the present work are discussed.


identifier: Yan, Liren <https://research.library.mun.ca/view/creator_az/Yan=3ALiren=3A=3A.html>   (1993) On the nonlinear evolution of internal gravity waves.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this thesis is to compare the nonlinear evolution of internal gravity waves obtained from a fully nonlinear primitive equation model with the evolution predicted by weakly nonlinear theories (i.e., the KdV and mKdV equations).  In order to focus on the nonlinear evolution, we consider the idealized case of an inviscid, incompressible Boussinesq fluid of constant depth with simple stratifications.  In such an environment, the evolution of internal waves is theoretically analyzed up to second order in amplitude by the method of asymptotic expansion following Lee & Beardsley [1974].  The resulting governing equation is the mKdV equation.  Meanwhile, the evolution of the same system is simulated by a fully nonlinear, inviscid numerical model.  The model is believed to be reliable (Lamb [1993 a,b]) and thus can be used to quantitatively verify the derived theory.  The theory is compared against the model results.  An initial depression is generated and the nonlinear steepening of the wave front and its subsequent evolution into an undular bore is investigated for different stratifications and wave amplitudes.  It is found that the theory is in very good quantitative agreement with the model results.  The mKdV equation generally improves the first-order KdV results for waves with nondimensional amplitude ∊ up to 0.07.  For small waves with ∊ < 0.02, the second order nonlinearity is not crucial.  The mKdV equation is not appropriate for waves with ∊ larger than 0.07.  These results provide further evidence that the fully nonlinear primitive equation model is reliable and give some indication of when the KdV and mKdV equations correctly predict the wave evolution.  It is also shown that after the undular bore begins to form, rotation has a minor effect on its subsequent evolution.


identifier: Mercer, Douglas G. <https://research.library.mun.ca/view/creator_az/Mercer=3ADouglas_G=2E=3A=3A.html>   (1989) Numerical evaluation of the boundary layer approximation for sound attenuation by solid particles in water.  Masters thesis, Memorial University of Newfoundland.

abstract: Sound scattering and attenuation by small solid spheres in viscous fluids at ultrasonic frequencies is investigated theoretically.  The approach is based upon that of Allegra and Hawley [1972], and Pierce [1981], and involves separating the sound field into different modes, which include strongly damped thermal compression and viscous shear wave modes, in addition to the usual weakly damped acoustic modes.  A simplification of the computational problem is then sought by obtaining approximate expressions for the (six) boundary conditions at the fluid-scatterer interface, through the use of a suitable boundary layer approximation.  We find that the radial stress at the boundary in the fluid may be approximated as the dynamic pressure, and that the thermal waves generated at the boundary are purely radial to an excellent approximation.  This result for the thermal waves implies that in a partial wave expansion of the attenuation, thermal effects only appear in the isotropic term, and higher order, nonisotropic terms may be treated in the viscous thermally non-conducting limit with high accuracy.  Numerical results are compared to Allegra and Hawley's measurements for aqueous suspensions of polystyrene spheres, and reasonable agreement is obtained in the appropriate limit.


identifier: Bhogal, Amritpal Singh <https://research.library.mun.ca/view/creator_az/Bhogal=3AAmritpal_Singh=3A=3A.html>   (1984) Numerical models of wind driven circulation in Lake Melville, Labrador.  Masters thesis, Memorial University of Newfoundland.

abstract: In this work, a number of numerical models have been adapted to study the wind-driven circulation of Lake Melville.  The first two models examined are the steady-state and the time-dependent homogeneous models.  The results indicate that the complex bottom topography forces a complicated circulation pattern which is relatively unaffected by the value of the bottom stress coefficient although the choice of such affects the current speeds directly.  For a constant wind of seven meters per second, the vertically averaged horizontal velocity is about ten centimeters per second, suggesting a surface velocity of about thirty to forty centimeters per second.  The third and last model is a vertically integrated two-layer model also driven by a constant wind of seven meters per second.  The results from this model indicate that baroclinic effects such as near-inertial oscillations and internal waves are important, since the internal wave phenomena associated with stratified lakes dominates their dynamics.  To date, no field measurements have been carried out on Lake Melville.  The simulations from the Models studied, in particular the two-layer model, suggest that current measurements would be valuable for model calibrations.


identifier: Staniaszek, Piotr <https://research.library.mun.ca/view/creator_az/Staniaszek=3APiotr=3A=3A.html>   (1987) Vibrational Raman spectra of hydrogen deuteride in the critical region.  Masters thesis, Memorial University of Newfoundland.

abstract: Lineshape data have been obtained for the polarized Raman (Q  branch) spectrum of HD in the critical region (Tc = 35.91 K). The temperature dependence of the spectrum was investigated in the single phase region along isochores corresponding to the critical density (pc), 0.5pC, and 2.25pc. Spectra of the liquid and vapor were also obtained along the coexistence line down to minimum temperatures of 18.14 K and 31.96 K, respectively. Emphasis is placed on the  pronounced variations in lineshape observed on the critical isochore where the behaviour is interpreted in terms of three effects: (i) normal pressure broadening (ii) direct, or pure, vibrational dephasing, and (iii) a specific kind of  critical broadening which occurs in the immediate vicinity of the critical point.


identifier: Verma, Kumar Krishna <https://research.library.mun.ca/view/creator_az/Verma=3AKumar_Krishna=3A=3A.html>   (1974) The new emission spectrum of selenium monoxide in the region 3185-2690 Å.  Masters thesis, Memorial University of Newfoundland.

abstract: The emission spectrum of SeO excited in an electrodeless discharge tube containing selenium dioxide powder by a high power microwave generator revealed the existence of a new band system in the region 3185 - 2690 Å consisting of 48 bands degraded to longer wavelengths. The vibrational analysis suggests that the bands arise from the transition C(³π) - X³∑⁻ (the states designated as C and D in earlier work by Reddy and Azam (1974) are hereafter to be referred to as D and E, respectively). Sub-systems, C(³π₀) - X³∑⁻ (F₂, F₃), C(³π₀) - X³∑⁻ (F₁), C(³π₁) - X³∑⁻ (F₂), C(³π₁) - X³∑⁻ (F₁) and C(³π₂) - X³∑⁻ (F₁) of C-X have been identified. The separations between the band heads having the same vibrational assignments (v', y") with a common upper electronic substate are consistent with the expected value of ∿ 2 λ, λ (= 86.4 cm⁻¹) being the spin-splitting constant of the X³∑⁻ state known from earlier work (Barrow and Deutsch, 1963; Azam and Reddy, 1973). Derived constants (in cm⁻¹) of state C are as follows: -- [special characters omitted] -- In addition, 8 new emission bands of Se0 degraded to longer wavelengths in the region 3040 - 2805 Å have been fitted into the vibrational scheme of the previously known B³∑ - X³∑⁻ system. -- Finally, Morse potential curves have been drawn for several known electronic states of Se0.


identifier: Choo, Chin Heng <https://research.library.mun.ca/view/creator_az/Choo=3AChin_Heng=3A=3A.html>   (1996) Brillouin scattering from a gas subject to a temperature gradient : optical considerations.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis describes an attempt to use the Brillouin light scattering technique to observe nonequilibrium effects in gaseous sulphur hexafluoride subject to a temperature gradient. Due to the inherent geometry of the experimental setup, an imaging fibre optic probe was investigated as a means of scattered light collection. The SF₆ gas was housed in a moderate pressure gas cell. The scattered light collected was analyzed with a Fabry-Perot interferometer. A computer simulation of the behaviour of temperature, density and refractive index for gaseous SF₆ subject to a temperature gradient was performed using a 2 dimensional nonconvective heat flow model. A computer simulation of the scattered ray paths from the gas cell to the optical fibre in the imaging fibre optic probe was also performed. The sound speed in SF₆ at a pressure of 1.28 MPa and a temperature of 20°C was measured to be 133 ± 6 m.s⁻¹. Sound speeds in SF₆ for pressures from 0.44 MPa to 1.83 MPa were also measured. These sound speeds showed a larger nonlinearity in its changed with different pressures than that calculated from theory. Nonequilibrium Brillouin spectra for SF₆ were observed at pressures of 0.891 MPa and 1.35 MPa with temperature gradients of about 15.3 K cm⁻¹ and 18.9 K cm⁻¹, respectively. The Brillouin components at nonequilibrium showed an intensity increase of about 16% when compared to their counterparts at equilibrium.


identifier: Mao, Samuel Sheng <https://research.library.mun.ca/view/creator_az/Mao=3ASamuel_Sheng=3A=3A.html>   (1996) Electroconvection in two-dimensional liquid crystal films.  Masters thesis, Memorial University of Newfoundland.

abstract: We have studied electrically driven convection in freely suspended films of smectic A liquid crystal. The layered molecular structure of the smectic A mesophase makes the film behave like a two-dimensional isotropic fluid, and well-controlled hydrodynamic flow has been achieved in films  as thin as two molecular layers in thickness. When a d.c. voltage applied across the film exceeds a certain critical value Vc, a one-dimensional pattern of convective vortices develops. The critical pattern wavelength appears to be independent of film thickness, and the critical voltage is linear in film thickness for thin films. Measurements of the  pattern amplitude indicate a supercritical bifurcation at convection onset, and the amplitude grows as a 1/2-power law  with respect to the normalized control parameter ε. The correlation length of the pattern varies as ε⁻¹/², and the pattern's relaxation time varies as ε⁻¹. These results are in agreement with predictions from a Ginzburg-Landau amplitude equation. Measurements of the flow velocity show that the amplitude of the pattern is suppressed at the lateral boundaries. The range of wave numbers for stable convection has been obtained experimentally. Close to onset we find the width of the stable band is proportional to ε, consistent with predictions of the theory of boundary-induced wavelength selection. In addition to convection experiments, a set of electrohydrodynamic equations is presented for understanding the two-dimensional electroconvection. Theoretical analysis indicates the normalized control parameter to be V²/Vc² - 1, in agreement with the experimental observations. A hydrodynamic model is also proposed to describe the flow observed near the sidewalls below the onset of convection. The flow in this model is caused by the electrohydrodynamic shear-stress interaction which originates from an interfacial charge density distribution at the lateral boundary.


identifier: Subramanian, Hamsa <https://research.library.mun.ca/view/creator_az/Subramanian=3AHamsa=3A=3A.html>   (1997) Investigation of geometric and electronic properties of conducting polymers using semiempirical approach.  Masters thesis, Memorial University of Newfoundland.

abstract:
In this work, we present theoretical evidence illustrating that cyano derivatives of conducting polymers such as polythiophene, polycyclopentadiene and polyfulvene have smaller intrinsic band gaps than their parent polymers. The  geometric and electronic properties of the parent and the derivative polymers are studied with the use of two methodologies: (1) the pseudo one-dimensional band structure calculations performed at the level of the semiempirical molecular orbital theory (Modified Neglect of Diatomic Overlap (MNDO) and Austin Model 1 (AM1)) and (2) oligomer calculations performed at the level of the ab initio molecular orbital theory. In particular, we have found that an organic polymer, poly-(dicyano-methylene-cyclopenta-difulvene) (PCNFv) has a comparable (possibly lower) band gap to the one observed in poly-(dicyano-methylene-cyclopenta-dithiophene) (PCNTH) (which has a band gap of 0.8  eV). The precursor of PCNFv is poly-(dicyano-methylene-cyclopenta-dicyclopentadiene) (PCNCY) in which two cyclopentadiene rings are connected by a dicyanomethylene group. Trends in structural properties indicate that the lower band gap in the cyano substituted polymers is accompanied by greater charge delocalization in the aromatic  or trans-cisoid forms and by greater charge localization in the quinoid or cis-transoid forms in comparison to
their parent polymers. Other important factors that contribute to band gap lowering are maximum planarity, weak interactions of the chain backbone with the bridging groups, enhanced π character of the highest occupied and lowest unoccupied bands and the additional stabilization of the conduction bands due to the charge transfer phenomena. The comparison of the heats of formation for the compounds indicates that polymers in planar-anti conformation are more  stable than those in twisted-syn conformation.


identifier: Lu, Cuijun <https://research.library.mun.ca/view/creator_az/Lu=3ACuijun=3A=3A.html>   (1996) Statistical studies of one-dimensional spatiotemporal chaos in the printer's instability.  Masters thesis, Memorial University of Newfoundland.

abstract: A number of statistical techniques are used to study spatiotemporal chaos in a one-dimensional pattern of fingers which form at a driven oil-air meniscus. It is shown that the long time average of the chaotic pattern is structureless. The rms deviation between finite and infinite time averages decreases approximately as a power law in the averaging time. The results suggest that for short averaging times (i.e., less than about 50 s) the short time average approaches the long time average much like a Gaussian variable, but that for longer averaging times the approach to the infinite-time average is significantly slower than that of a simple Gaussian process. Generally, the early time behavior of the cross-correlation coefficient between patterns recorded at different times decays exponentially around the threshold of STC. The spatial autocorrelation function of the chaotic pattern has a decaying oscillatory tail that is approximately the product of a cosine and a decaying exponential. The correlation length is about equal to the wavelength of the basic pattern.


identifier: Wan, Bangjun <https://research.library.mun.ca/view/creator_az/Wan=3ABangjun=3A=3A.html>   (1997) A numerical study of conjugate flows and flat-centred internal solitary waves in a continuously stratified fluid.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis a theoretical model describing the limiting flow structure in the centre of a fully nonlinear, flat-centred internal solitary wave in a fluid of finite depth H has been developed using the conjugate flow concept.  The conjugate flow solution gives the vertical structure of the isopycnal displacement and the fluid velocity at the centre of a flat-centred internal solitary wave as well as the propagation speed of the wave.  The mode-1 internal solitary waves are calculated in a continuously stratified fluid given by hyperbolic tangent density profiles with one or two pycnoclines.  Solutions obtained with and without the Boussinesq approximation are compared.  The non-Boussinesq results are almost identical with the Boussinesq results if the surface to bottom density difference is 4% or less unless the pycnoclines have a thickness comparable to the total fluid depth. -- For density stratifications with a single pycnocline, conjugate flow solutions are obtained when the pycnocline is not too close to the boundary.  The size of the valid solution range decreases as the thickness of pycnocline increases.  When the Boussinesq approximation is applied, the magnitude of the extreme isopycnal displacement grows as the centre of the pycnocline in the undisturbed region moves away from the mid-depth: the wave propagation speed increases as the centre of pycnocline moves toward the mid-depth.  If the thickness of the pycnocline is greater than 8.4% of the fluid depth, the parallel shear flow in the centre of a flat-centred internal solitary wave is linearly stable.  As the pycnocline gets narrower the flow becomes potentially unstable over an increasing range of pycnocline heights. -- For stratifications with two pycnoclines multiple conjugate flow solutions may exist.  When the two pycnoclines are equidistant from the mid-depth, one above and one below, there are two solutions if the pycnoclines are well separated and not too close to the boundaries.  If the pycnoclines are close together there are no solutions if the Boussinesq approximation is made and one solution if the approximation is not made.  If the two pycnoclines are not equidistant from the mid-depth there can be 0. 1. 2. or 3 solutions.  Flat-centred wave can exist only if there is a conjugate flow solution, but the converse is not true.  Having a conjugate flow solution does not necessarily mean that there is a flat-centred internal solitary wave.


identifier: Ibrahim, Akram Yousif <https://research.library.mun.ca/view/creator_az/Ibrahim=3AAkram_Yousif=3A=3A.html>   (2000) A study of DPPC and DMPC monolayers at different temperatures using epifluorescence surface balance.  Masters thesis, Memorial University of Newfoundland.

abstract: In this study some modifications have been introduced to the  existing Epifluorescence Surface Balance (EFSB). Those modifications are essential for working at different temperatures. Phospholipid researchers are interested in revealing the mysterious behavior of certain phospholipids such as Dipalmitoylphosphatidylcholine (DPPC) which is the major component of lung surfactant. Many published studies have presented the surface pressure - area per molecule isotherms of DPPC and Dimyristoylphosphatidylcholine (DMPC) at different temperatures. In this study isotherms of DPPC and DMPC in the temperature range from 14 °C to 42 °C and from 6 °C to 23.3°C respectively, have been constructed after modifications have been introduced. A good agreement between the published isotherms and the ones presented here is obtained. The isotherm technique has been found invaluable, but may be usefully complemented by other techniques for obtaining information about the phase behavior of lipid monolayers at the air/water interface. -- Unfortunately, there are not many published studies at higher temperatures in the field of visualization of the phospholipid monolayer domains. The problem of subphase condensation on the surface of the objective lens and other problems have prevented researchers from carrying out such studies. In this study the problem of the condensation has been minimized by introducing a technique of "Teflon Sleeve" heater. Some stimulating results are presented concerning the visualization of domains of DPPC at temperatures in the range from 18 °C to 35 °C. -- The study presented in this thesis can be useful to researchers who are interested in visualizing the domains of DPPC and monitoring their behavior at temperatures near to physiological temperature, which is 37 °C. -- The domains of DMPC also have been visualized at temperature of 5 °C. Unfortunately, the DMPC domains have not been recorded due to their small size. The limitation in the resolution of our recording system has prevented that recording. -- Fundamental literature about phospholipid monolayers - particularly DPPC and DMPC- is presented in chapters one and two. The experimental set-up of the EFSB is discussed in chapter three. The results, which have been obtained in this study, are discussed in chapter four.


identifier: Arthur, Joseph Oliver <https://research.library.mun.ca/view/creator_az/Arthur=3AJoseph_Oliver=3A=3A.html>   (1984) Political attitudes and participation among high school teachers in Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract: Newfoundland teachers may be seen to occupy a distinctive and, potentially influential position in Newfoundland society.  In spite of this potential central role, there is a traditional belief that teachers, like clergymen, are supposed to refrain from active political activities.  In Newfoundland, where the educational system is denominationally controlled, teachers role might be expected to come under scrutiny not only from people in the community or government officials, but, also from members of the school board and clergymen.  In the light of the above, this study attempted to learn; -- 1.  The extent to which high school teachers participate in political activities compared with the general public in Newfoundland. -- 2.  Teachers' perception of restrictions placed on their political activities and the extent to which this affects their participation rates. -- In measuring political participation, the study adopts a multidimensional conceptualization of political participation - voting, campaigning, particularized contacting and community activities. -- Data used for this study were primarily collected by a province-wide mail survey of 273 high school teachers administered in May and June 1983.  The questionnaire focused on teacher participation and related attitudes.  To validate the more quantitative survey findings, informal interviews were conducted and information was gathered from teachers in some Newfoundland towns across the province. -- Principal findings were that: -- 1.  Newfoundland high school teachers participate more actively than the general public in voting, party and campaign work, and particularized contacting activities.  When we compare their participation rate with that of the general public with university education, we find that teachers report higher levels of participation in most activities. -- 2.  Considering the variations in teacher participation, male high school teachers and older teachers participate more than their counterparts. -- 3.  Most teachers do not perceive serious objections to their participation in partisan political activity.  Discussing controversial political issues in class and striking were seen as more likely to attract disapproval, especially from school boards, according to teachers. -- 4.  The perception that a teacher's action might be objected to by school board members or people in the community does not inhibit participation.  Rather, those who perceive serious objections to their actions tend to participate more. -- 6.  While the perception of objections to a teacher's activity does not lower his participation rate, interest in politics or apathy has a great impact on teachers' participation.  Teachers with low interest in politics participate less than those with high interest.


identifier: Letto, Douglas Mervyn <https://research.library.mun.ca/view/creator_az/Letto=3ADouglas_Mervyn=3A=3A.html>   (1995) Chocolate bars and rubber boots : the Smallwood industrialization plan.  Masters thesis, Memorial University of Newfoundland.

abstract: The Confederation of Newfoundland with Canada in 1949 was a mixed blessing. On the plus side, Canada's array of social programs and its strong economy gave much-needed security to                                     Newfoundland and its people. On the minus side however, Newfoundland became, overnight, part of the Canadian common market. This new relationship meant the end for many local manufacturers and the loss of a substantial number of jobs. In addition, Confederation brought down immigration barriers  between Newfoundland and Canada, thereby providing a borderless escape route for Newfoundlanders intent on finding improved economic conditions. Stepped-up out-migration was viewed as a serious problem by the new province's first government. -- This thesis traces the Smallwood government's first major response to the challenges posed by Confederation. Out of it came an industrialization policy that would lead to the establishment of sixteen-sponsored industries and the expenditure of two-thirds of the cash surplus accumulated during the Commission of Government period. -- The industrialization program was poorly planned, both in terms of the business partners it sought and the industries it funded. In the end, most of the new industries failed, without having returned a penny in principal or interest to the Newfoundland government which bankrolled the program with loan guarantees. -- Chapter One outlines the environment in which Smallwood created the industrialization  program, and introduces his economic czar and confidant, Dr.  Alfred Valdmanis. -- Chapter Two attempts to capture the deal-making and the political rhetoric through which the program developed. It reveals the first signs of duplicity on the part of the government in its public and private musings about the program. -- Chapter Three gets to the heart of the crisis the industries found themselves in, and details the internal management of the crisis both from inside the companies and inside government. -- Chapter Four provides a broader perspective of the development dilemma faced by small economies, by focusing on the case of Nova Scotia and its experience with Industrial Estates Limited. -- Chapter Five places the failure of the Smallwood program in the context of five distinct economic development efforts  in the post-Confederation era. The most recent effort was unveiled in late 1994 by the Liberal government of Clyde Wells.


identifier: Bussey, Barry W. <https://research.library.mun.ca/view/creator_az/Bussey=3ABarry_W=2E=3A=3A.html>   (2001) A case study of public interest groups in the Newfoundland educational reform policy-making process.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this study was to investigate the role interest groups played in the Newfoundland education reforms of the 1995-1997-time period.  The demise of the church-based school system in Newfoundland during the 1990s has many wondering what happened to cause such a dramatic turn of events. -- This paper argues that investigating the interest groups during that tumultuous period may best be viewed within the naturalistic paradigm rather than the positivistic paradigm.  Thus, the qualitative methodology underlies this case study.  The theoretical framework is based upon the pluralist/policy community theories and, in particular, the work of A. Paul Pross. -- Key to this study of the influence interest groups had on the educational reform was the determination of their potential capacity to influence government.  As Pross puts it, were the groups fully "institutionalized"?  The determining variables as to whether a specific group was institutionalized are based upon Pross's "Continuum Framework," which is explained within the thesis. -- This thesis concludes that while Pross's work was helpful, his theory has to be extended to include the role that individual key players have on the process of public policy.  This research suggests that while for decades interest groups sought to move the Newfoundland Government away from a denominational-based school system, no changes were forthcoming until a political leader arrived with the "courage" to bring the matter onto the public agenda.  Once on the public agenda, school reform began to take a life of its own - politicians were often unable to control the process.


identifier: Bickford, Sandra <https://research.library.mun.ca/view/creator_az/Bickford=3ASandra=3A=3A.html>   (1997) Battles in the gender war : theories of international relations and gender and the realities of women in war.  Masters thesis, Memorial University of Newfoundland.

abstract: Informed by the notion that international relations in its present configuration is androcentric and narrowly construed, this thesis examines gender critiques of international relations and ways in which international relations theory has precluded an analysis of gender.  Through the examination of the works of various scholars writing on the topic of gender and international relations, the ways in which women have been excluded from both international relations theory and practice are elucidated.  By challenging the hegemonic discipline on the basis that it neither adequately nor accurately understands, explains or predicts international relations, various points of entry into critiques of the discipline are raised.  The point of critique examined in this thesis is the issue of women and war.  The first chapter examines gender critiques and some of the central themes within the sub-field of gender and international relations, concluding that the study of gender contributes at least partially to the understanding of international relations.  Further, the chapter examines the ways in which gender and international relations theory have broadened conceptions of the discipline and problematized inscribed gender roles.  The second chapter continues the examination of gender roles by examining theories of women in the non-traditional role of soldier or warrior, in addition to examining theories of patriarchy and militarism.  It is argued that many of the arguments against women in the military, which maintain that women never have been and are incapable of becoming effective soldiers, are rooted in outdated and illogical gender constructs.  To buttress this assertion, chapter three examines several examples of women's involvement in wars, from the American civil war up to the Persian Gulf war.  Further, it is argued that the focus on the theoretical debate surrounding women in the military has obfuscated more important issues facing enlisted women, including sexual harassment, physical assault and rape; recent examples of these occurrences from the United States and Canada are provided.  The fourth and final chapter concludes by problematizing the inscribed gender roles which are implicitly assumed within the discipline of international relations and which function as a barrier to women's active and meaningful involvement in the military.  It is argued that this can only be redressed by taking gender seriously as an elucidating variable in international relations.


identifier: Grimmer, Barbara Lee <https://research.library.mun.ca/view/creator_az/Grimmer=3ABarbara_Lee=3A=3A.html>   (1980) Habitat selection of Leach's storm petrel (Oceanodroma leucorhoa) in three Newfoundland colonies.  Masters thesis, Memorial University of Newfoundland.

abstract: Habitat selection of Leach's Storm Petrel (Oceanodroma leucorhoa) was studied in three Newfoundland colonies of this species. Habitat preferences as inferred by petrel burrow densities were examined and quantified (Study 1 and 2). Of habitat parameters studied, peat depth, tall vegetation and fern type vegetation were positively related to increasing petrel burrow density. Habitat preferences as a function of burrow density varied between colonies. -- Burrow architecture was examined in one colony of petrels. Physical characteristics of the burrow may affect the internal microclimate of the burrow. Several burrow configurations were described which may serve to moderate internal burrow microclimates, maintaining a cool, stable environment in the burrow. The necessity for a cool, stable internal burrow environment is related to aspects of Leach's  Storm Petrel life history which include early onset of nestling thermoregulation. -- Eggs, hatching data and chick weights in a high burrow density (HD) area of one colony were compared with these measures taken in a low burrow density (LD) area of the same colony (Study 4). Non-significant differences in egg size were found between the two areas. No differences were found between the two areas in probability of hatching. HD area chicks were heavier and were more likely to be alone in the burrow on a given date than were LD area chicks. -- A comparison of egg measurements from previous breeding seasons with the 1978 data suggests that egg dimensions (breadth and egg size) increase slightly with increased breeding experience of the female. -- The ontogeny of habitat preferences was studied. The assumption that habitat preferences are mediated by habitat imprinting was tested (Study 5). Chicks from homogeneous biomes were allowed to choose between samples of  their natal biome and a novel biome in a maze. Four age groups were tested. The test results were inconclusive, as chicks chose biome types randomly. Possible reasons for the experimental failure are discussed.


identifier: Pelletier, Frederick L. <https://research.library.mun.ca/view/creator_az/Pelletier=3AFrederick_L=2E=3A=3A.html>   (1982) Extraversion and hypnotizability : an interactional analysis.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this experiment was to conduct an interactional analysis of the factors that influence or determine hypnotizability. Two series of rapid hypnotic inductions were developed; in one, the inductions were extremely varied and consisted of three unconventional inductions, and in the second series, three successive eye-closure inductions were administered. -- It was hypothesized  that there would be an interaction between the personality variable of extraversion and the method of hypnosis. Extraverts were hypothesized to demonstrate greater hypnotizability than introverts in response to the varied hypnotic induction while it was predicted that the introverts would respond more strongly to repeated eye-closures. -- Sixty university students were divided into high and low extraversion groups on the basis of their extraversion scores. Twelve of these were drawn randomly and  assigned to an external control group. The remaining subjects were subdivided and assigned to one of the two induction conditions. All subjects completed an interest rating scale at the end of the experiment. -- The results of  the experiment indicated that extraverts were more hypnotizable than introverts. The predicted hypothesis was not confirmed, but an unanticipated interaction was apparent: The rapid successive induction procedures produced  greater hypnotic responsivity in extraverts when their scores were compared to the external control group which received a standard eye-closure induction only. This difference was not evident with regard to introverts. -- As predicted, hypnotizability was found to correlate with interest. The differences among the group means for the interest ratings were the same as those of the hypnotizability scores. These results were discussed within  the framework of Eysenck's theory of extraversion. In addition, methodological difficulties were discussed and suggestions concerning future research were made.


identifier: Dornan, Wayne Allan <https://research.library.mun.ca/view/creator_az/Dornan=3AWayne_Allan=3A=3A.html>   (1984) Facilitation of lordosis in the female rat by midbrain central gray infusions of substance P.  Masters thesis, Memorial University of Newfoundland.

abstract: Infusions of LHRH ( 50ng ), and Substance P ( 50ng, 500ng, and lug ) into the midbrain central gray led to a prompt facilitation of lordosis which was evident as early as 5 minutes post infusion, and depending on the dose had a duration of at least 120 minutes. Despite an apparent trend,  different doses of substance P did not produce a signifcant dose-dependent facilitation of lordosis. Doses of substance P ( 50ng ), and LHRH ( 50ng ), produced effects on lordosis scores, but did not differ between tests. Administration of an anti-serum raised in rabbits against substance P failed to produce a statistically significant reduction in lordosis  scores, although here too, a trend was evident.


identifier: Crewe, Valerie Elizabeth <https://research.library.mun.ca/view/creator_az/Crewe=3AValerie_Elizabeth=3A=3A.html>   (1983) Assertiveness training with institutionalized delinquents.  Masters thesis, Memorial University of Newfoundland.

abstract: The present study investigated the effectiveness of assertiveness training as a treatment technique for decreasing the aggressive behaviors and improving the interpersonal skills of juvenile delinquents. Specifically, this study compared the relative effectiveness of assertiveness training to a discussion group approach in which no specific behavioral instruction was employed. The subjects were 12 residents of a provincial training school who volunteered to participate in the treatment program. The  treatment program was designed to teach the subjects assertive behavior, anger management and the use of negotiation skills. -- The experimental design incorporated both between groups and within group comparisons. The three treatment conditions consisted of an assertiveness training group, a discussion group and a no-treatment control group. An assessment battery was administered to all subjects both before and after the treatment program. Two methods of evaluation were employed to assess treatment effectiveness: a behavioral role-play test and a self-rating problem checklist. The subjects' performances on the Behavioral Role-Play test were independently rated by two judges for six dependent behavioral measures of assertiveness. The problem checklist asessed the frequency of occurrence of problem situations and the level of difficulty associated with handling the situations. -- The results of this study did not reveal significant post-treatment changes in the three groups on any of the six dependent behavioral measures  of assertiveness or on the self-rating problem checklist. Hence, the findings of the present study did not confirm the  hypothesis that assertiveness training is more effective than a discussion group approach for decreasing aggressive behaviors and improving the interpersonal skills of juvenile  delinquents. -- Explanations for treatment ineffectiveness are discussed. Ramifications of the present findings for future research relating to assertiveness training with juvenile delinquents are suggested.


identifier: MacQuarrie, Lachlan John <https://research.library.mun.ca/view/creator_az/MacQuarrie=3ALachlan_John=3A=3A.html>   (1986) Attributional styles of lonely college students.  Masters thesis, Memorial University of Newfoundland.

abstract: Men are sometimes more self-serving than women when making causal attributions for success and failure. It may be that lonely men differ from lonely women in the amount of self-serving bias they show when making causal attributions for interpersonal success and failure. A self-serving bias scale  was constructed. Along with the UCLA Loneliness Scale, it was administered to 74 male and 136 female undergraduates. Loneliness was related to amount of self-serving bias. Lonely respondents tended to be less self-serving than non-lonely respondents, replicating previous research. Neither gender nor other demographic information was related to self-serving bias. Insensitivity of the self-serving bias scale and true lack of gender differences in the situation studied are both discussed as possible reasons for failure to find gender difference.


identifier: Perry, Dean Allen <https://research.library.mun.ca/view/creator_az/Perry=3ADean_Allen=3A=3A.html>   (1987) Auras as predictors of psychopathology associated with seizure disorders.  Masters thesis, Memorial University of Newfoundland.

abstract: Previous research has pointed to the importance of identifying seizure patients who are at risk for the development of psychopathology. Pre-ictal aura experiences have been suggested as phenomena mediated by limbic system involvement which may be related to psychopathology in seizure patients. The present study attempted to identify which seizure patients are at risk for the development of psychopathology, the psychological problems that this subgroup experiences, and to explore the question of whether  an aura or set of auras are unique to a high risk group of seizure patients. The present study involved 114 seizure patients, 91 psychiatry patients, 28 dialysis patients, 15 diabetic patients, and 100 nonpatients. All subjects completed the Personal Behavior Inventory (PBI). Seizure patients provided information on aura experiences by completing the Aura Questionnaire. Background and medical information was also collected. Results indicated that seizure patients who were "misclassified" as psychiatry patients [seizure(psych)] by discriminant function analysis of PBI cluster scores reported giving a more philosophical interpretation to their lives, being more depressed, and having a greater variation in mood relative to other seizure  patients, the chronic illness contrast groups (i.e., dialysis and diabetic patients), and normal controls. Seizure(psych) patients experienced a unique subgroup of auras with respect to intensity: (a) the perception of formed images; (b) the perception of humming or buzzing sounds; (c) irritability; (d) jamais vu; (e) the perception of time speeding up or slowing down. Data are presented which suggest that these five auras are likely due to seizure induced activation of the limbic system. Neither seizure(seiz) nor seizure(nonp) patients were found to experience a unique aura or subset of auras with respect to frequency and intensity. Background and medical information revealed seizure(psych) patients to be more likely to experience alcohol problems, utilize psychiatric facilities,  and attempt suicide. Compulsivity was shown to be part of a sick person syndrome. Seizure diagnosis and anticonvulsant medication effects were shown to be unrelated to seizure patient PBI profiles. Implications of the results are discussed in terms of utilizing reported aura experiences for the identification of seizure patients who are at risk for the development of psychopathology.


identifier: Maddigan, Richard Ian <https://research.library.mun.ca/view/creator_az/Maddigan=3ARichard_Ian=3A=3A.html>   (1978) Evaluation of videotaped instruction : an unlikely alternative to traditional instruction in a university setting.  Masters thesis, Memorial University of Newfoundland.

abstract: Much current research has demonstrated that when maximum learning efficiency is desired, there are no consistent differences between instructional television (I.T.V.) and traditional instruction (T.I.). However, preliminary work here at Memorial University of Newfoundland has suggested that learning from T.I. was superior to learning from I.T.V. The present research attempted not only to evaluate the comparative effectiveness of  I.T.V. and T.I. but also attempted to isolate the significant input variables which produce the actual learning in these situations, by introducing into the experimental teaching setting the “reverse” method of both I.T.V. and T.I.  The opposite of traditional live lectures would be the videotapes of those actual live lectures while the opposite of the standard studio-produced tapes is to present, in sequence, the visual material of the studio tape live in the classroom.  These experiments involved instruction on the topic of the cumulative curve followed by a difficult and carefully constructed posttest. Five different modes of Presentation were evaluated: 1) live lectures, 2) videotape of live lectures, 3) live lectures using videotaped inserts, 4) studio-produced videotapes, and 5) a text condition. Although few significant differences were found in the two experiments, with respect to the order of effectiveness the following consistent differences were found. First, live lectures produced superior learning; next, were videotapes of live lectures and live lectures using videotaped inserts; third, came studio-produced videotapes, and finally, the text produced the least effective learning. -- The individual difference variables of intelligence, degree of anxiety, and degree of extraversion-introversion did not interact significantly with any particular method to produce maximum learning in any “type” of student. Also correlational data revealed that students like and learn most not only from the methods which, in fact are the most effective , but also from the methods which they perceive to be most effective.