Department of Physics (Fredericton)

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The Hall Effect
The Hall Effect
by John Connor, 35 unnumbered pages after the last numbered page
The determination of the phase diagram for a DMPC/DSPC lipid mixture using 2H NMR difference spectroscopy
The determination of the phase diagram for a DMPC/DSPC lipid mixture using 2H NMR difference spectroscopy
by Irene Lees, A technique called deuterium NMR difference spectroscopy was used to determine the phase diagram for a mixture of two different lipids. The two lipids studied were dimyristoylphosphatidylcholine (DMPC) and distearoylphosphatidylcholine (DSPC). Since deuterium NMR was used to acquire the data, the DMPC lipid's hydrocarbon chains were deuterated to yield DMPCd54. The lipid, at low temperatures, is in the gel phase and passes into the liquid crystalline phase as the temperature is raised. Experiments were conducted on mixtures with a variety of lipid concentrations at temperatures ranging from 4°c-so0 c. The corresponding spectra obtained using 2H NMR were used to calculate the endpoints of the phase boundaries at each temperature. These endpoints determined the phase diagram for the DMPC/DSPC mixture.
The distance to the Pleiades star cluster as determined by photographic photometry
The distance to the Pleiades star cluster as determined by photographic photometry
by Gary Norman Kierstead, A color magnitude diagram of the Pleiades star cluster was studied. Via main sequence fitting, a distance modulus of 3.1 magnitudes was obtained corresponding to a distance of 41.7 parsecs. Small sample statistics were applied to the data using "student" t-Distribution tables with 50% confidence limits. Main sequence fitting of this resulted in a distance modulus of 3.3 which corresponds to a distance of 45.7 parsecs. The generally accepted value for the distance of the Pleiades is approximately 140 parsecs.
The field widening of a Michelson interferometer theory and observations
The field widening of a Michelson interferometer theory and observations
by Jeffery Langille, Characteristics that define a wide-angle Michelson interferometer (W AMI) are investigated and the properties that allow its use as an atmospheric spectral imager are identified. This is done while emphasizing the instrument/detector combination and the general problem of controlling the flow of light through an optical system. It is shown that each component is required in order to retrieve useful information from the interferometer. The instrument used for this project is the interferometer optics from the Mesospheric Imaging Michelson Interferometer (MIMI) which is a Doppler Michelson Interferometer (DMI). The theoretical model representing the expected intensity arriving at a detector is developed and an analysis of the extent of the field widening is carried out by developing an optical system to image the fringe pattern produced by the 632.8 nm (HE-NE laser) and 546.074 nm (mercury lamp) lines.
The ground state configuration of dysprosium fluoride
The ground state configuration of dysprosium fluoride
by Kari Beyea, Index has irregular pagination: A1-A4, B1-B4, C1, D1-D2, E1 2 unnumbered pages
The measurement of collagen in angioplasty samples
The measurement of collagen in angioplasty samples
by Anne Ridler, Angioplasty is a method that is used to remove blockages in arteries. It is performed by inserting a balloon to the location of the plaque and inflating it at a high pressure. There are two reactions which have been observed; one where the edges of the plaque lift off the artery wall and the other where the plaque is compressed (Kleiman et al., 1990; Marsico et al., 1995; Hjemdahl-Monsen et al, 1990). This is thought to be because of the concentration of collagen, a protein with a high tensile strength, in the plaque (Roach, personal communication). It has been observed that there is a greater reduction in stenosis or blockage and so an increase in blood flow in arteries where the edges of the plaque are torn away post-angioplasty (Block et al., 1981). In order to determine the conditions under which either reaction will occur, a method was developed which allows for the concentration and distribution of collagen to be measured in formaldehyde fixed tissue. The absorbance of the tissue was found to relate to percent collagen through: %Coll= 70.9Abs - 5.7. The concentration and distribution of collagen in formaldehyde fixed tissue can now be measured down to the pixel level. This allowed for the concentration of collagen to be measured at various locations in the arteries that had undergone angioplasty and measure the change in collagen through the atherosclerotic lesions.
The optimization of a liquid argon calorimeter with accordion geometry
The optimization of a liquid argon calorimeter with accordion geometry
by Dugan 0 'Neil, Future hadron colliders, like the Large Hadron Collider (LHC) planned at CERN, Geneva, will allow physicists to explore the laws of nature down to the Te V / c2 mass scale. Because of the small rate of production of the events of interest, the LHC will operate at a high collision rate. This puts serious demands on detector performance. One of the most important components of the planned detectors at LHC is the calorimetry, which measures the energy of impinging particles. This project focusses on the study of liquid argon calorimetry for the proposed ATLAS experiment at the LHC. Computer simulations have been used to optimize the geometry of a liquid argon calorimeter with accordion' geometry
The photographing and analysis of the absorption spectrum of the NS radical in the 57200 cm-1 to 59200 cm-1 region
The photographing and analysis of the absorption spectrum of the NS radical in the 57200 cm-1 to 59200 cm-1 region
by C. Ian Short, The ultraviolet absorption spectrum of the NS radial has never been observed in the region above 57000 cm-1. In this experiment, the region from 57300 cm-1 to 59200 cm-1 was photographed and analysed. Two new electronic states were discovered, a 2∑ state, and a 2Δ state. The vibrational level separation in these states was determined, as wad the splitting in the 2Δ state.
The renormalized Nurnerov method of solving the Schrödinger equation
The renormalized Nurnerov method of solving the Schrödinger equation
by Dwight Dunfield, After last numbered page, appendix is numbers A1- A9, B1-B3, and C3
The role of tidal and planetary waves in the middle atmosphere
The role of tidal and planetary waves in the middle atmosphere
by Jeff Taylor, With interest in atmospheric science increasing in the last thirty years, the development of numerical models that simulate motion in the atmosphere has become invaluable. The Extended Canadian Middle Atmosphere Model, or extended CMAM, is the first such model to be developed in the entire world. As part of the development process, particular aspects of atmospheric motion are selected and data generated by the model is scrutinized to determine how well the motion is simulated. Here, the particular aspects of concentration are tidal and planetary waves. A basic description of atmospheric composition is given as well as an introduction to atmospheric dynamics. The theoretical framework of atmospheric waves and tidal motion is then developed from first principles, with emphasis placed upon prognostic rather than diagnostic equations. A description of the numerical methods utilized by the extended CMAM is specified as well as the physical process of obtaining and manipulating the data. The data analysis and results are divided into two sections: one concerning the tidal signatures produced by the model, and one concerning planetary waves. All of the computer programs employed for this task are attached as appendices.

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