Dissertations / Theses on the topic 'Lake Murray'

This thesis found that the three communities of Midvale, Murray, and Sandy were the center of the smelting industry in the Salt Lake Valley. These communities became the center of smelting because of their central location, the readily available water supply, and the availability of an inexpensive, efficient transportation system to ship the bullion. The smelters were surrounded by two major mountain ranges which provided a ready supply of good lead, silver, and copper ore.The development of the smelting industry followed three separate phases or periods. The first phase was one of experimentation or period of discovery, in which the smelters operated without the technological skill necessary to be financially successful. The second phase was highlighted by the emergence of skilled German mining engineers who enabled the smelters to be financially successful. Phase three was ushered in during the late nineteenth century by the industrialists who consolidated the smaller smelters and built larger, more efficient plants.

Methods were developed for the determination of methylmercury in natural waters and sediments based on steam distillation and aqueous phase ethylation followed by gas chromatography-atomic fluorescence spectrometry. The methods were shown to be free from measurable artefactual methylation of inorganic mercury and offered improved sample throughput over existing methods. Improvements were made to existing methods for the determination of total mercury in biota, sediments and natural waters and dissolved mercury species in natural waters. These methods were applied to the study of mercury cycling in two remote field sites. The cycling of mercury species was studied in Lake Murray in Western Province, Papua New Guinea, which has been historically noted as a region of high mercury concentrations in fish. Concentrations of methylmercury and total mercury in the water column were found to be variable and consistent with non-contaminated lake systems. Concentrations of methylmercury and total mercury in the sediments were also found to be low, except for in the south of the lake, which was influenced by an intermittent supply of water and sediments with elevated mercury concentrations from the Strickland River. Methylmercury concentrations in the sediments were generally higher in the backwater areas due to littoral processes. The low concentrations of methylmercury in the sediments and waters were inconsistent with other systems previously studied in the northern hemisphere, showing a link between high mercury concentrations in fish and high concentrations of methylmercury in waters or sediments. Therefore, the biota of Lake Murray were studied in order to account for the differences between this and other systems. A study was conducted of the stable isotope ratios of carbon and nitrogen in biota from Lake Murray to elucidate key food-web interactions. This study revealed that the dominant carbon source for fish in the lake is plankton, although algae and macrophytes may also be involved in the food-web. The methylmercury bioaccumulation factors between trophic levels were similar to those measured in temperate systems of the northern hemisphere. The high concentrations of methylmercury, observed in piscivorous fish, were shown to be a consequence of the complex food-web and the number of trophic levels in the food-chains. The cycling of mercury species was studied in Lake Gordon and Lake Pedder in southwest Tasmania, which has recently been identified as being in a region of high mercury concentrations in trout and eels. The concentrations of total mercury were found to be reasonably uniform in the waters of both lakes, spatially and temporally. The concentrations of methylmercury in the waters were seasonally variable, and were consistently lower in Lake Pedder than in Lake Gordon. Dilution of methylmercury concentrations by precipitation direct to the lake surface, probably accounts for the most of the difference in methylmercury concentrations between the lakes. Owing to the long residence time of water in Lake Gordon, this reservoir mixes inputs of water with varying methylmercury concentrations. Concentrations of total mercury and methylmercury in submerged soils were low and depth profiles of mercury species in the water column did not show evidence of a gradient of mercury concentrations due to releases from the sediments. The concentrations of methylmercury observed in the water column are consistent with the concentrations observed in the fish. A budget of the mercury inputs and outputs to Lake Gordon showed that in-lake processes and sources in the catchment areas both contributed significantly to the concentrations of methylmercury in the lake. The methylation of mercury in Lake Gordon appeared to mainly occur in the surface waters (< 10 m) and was not consistent with processes leading to the methylation of mercury at the oxic/anoxic boundary observed in seepage lakes in Wisconsin. The concentrations of total mercury and methylmercury in bogs in the catchment areas of Lakes Gordon and Pedder, were high and governed by the concentration of organic matter in the sediments. The processes involved in the supply of mercury species from the Lake Gordon and Lake Pedder catchments appear to be similar to those in drainage lakes in the temperate and boreal regions of the northern hemisphere. The formation of the Lake Gordon and Lake Pedder reservoirs appears to have had little impact on the mean annual concentrations of methylmercury released to the downstream environment.

Title from PDF of title page (University of Missouri--Columbia, viewed on Apr. 14, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Marcus Rautman. Vita. Includes bibliographical references.

Thesis (M.A.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 22, 2008) Includes bibliographical references.

Este trabajo está centrado en los logros militares del César Juliano en la Galia, la usurpación de Magnencio y las batallas más importantes del periodo, Estrasburgo y Mursa. Se ofrece un estudio del Ejército Romano de Occidente y una breve visión de los problemas defensivos contra los bárbaros. Se examina la estructura y disposición de la frontera romana en el Rin y de las razones por las que resultó ineficaz durante las Grandes Invasiones del siglo V. Se ofrece una traducción española del panegírico de Mamertino del año 362.
This work is focused in the military deeds of Julian Caesar in Gaul, the usurpation of Magnentius and the key battles of that time, Strasburg and Mursa. It offers a study of the Roman army in the West and a quick insight to the defensive problems against barbarians. A survey of the disposition and structure of the roman frontier in the Rhineland and the reasons why it failed to be successful during the Big Invasions of the Fifth Century. Also features a spanish version of the Mamertinus panegiric of 362.

La recherche est représentée en deux volumes et un enregistrement sur un DVD. Dans le volume est présentée la particularité du texte qui se consiste en introduction, six chapitres, abréviation, sigle et bibliographie. Le deuxième volume représente des 267 planches et des 17 tableaux. Dans introduction ont été déterminées les limites chronologiques – fin du III ème jusqu’au chute de la civilisation de l’antiquité tardive sur les Balkans à la fin du VIe et au début du VIIe siècle ap. J.-C. On a fait un bref aperçu sur les recherches de ces monuments. Dans le Chapitre I ont été envisagées les différentes méthodes analytiques. Au début, on a décrit la recherche des peintures murales des tombeaux réalisée in situ. Pour obtenir des informations concernant les types des colorants et des liants de la couche picturale, ainsi que l’établissement de la composition quantitative et qualitative de différents mortiers ont été appliquées les méthodes analytiques suivantes : pétrographique et minéralogique, granulométrie, microsonde électronique et microscopie électronique à balayage (MEB), diffraction des rayons X, spectrométrie IR et spectrométrie IR Raman. Dans le Chapitre II a été faite une recherche sur les divers matériaux de la structure des peintures : matériaux de construction, mortier de liaison, couches d’enduit, pigments et liants. On a constaté que les peintres ont utilisé, au début de la période, des pigments chers et que l’on les a appliqués en état pur. Tels pigment ont été le cinabre et le bleu égyptien. D’autre part la palette s’est progressivement appauvrie. La riche gamme de pigments, existant pendant la période de la fin du IIIe au début du Ve, a devenu de plus en plus restreinte en aboutissant également à l’usage de l’ocre rouge qui a été rarement accompagné de couleur verte (terre verte) vers la fin du Ve et au VIe siècle ap. J.-C. Le Chapitre III présente les techniques de réalisation et le système de travail. On a déterminé que la technique principale d’exécution est a fresco, mais on a constaté aussi d’autres techniques (fresque à la chaux, peinture à la chaux, détrampe). Les constatations notées dans les chapitres précédents nous ont permis de faites la synthèse dans le Chapitre IV. Les matériaux et les techniques de réalisation de la peinture funéraire sont représentés en ordre chronologique. Dans le Chapitre V on a montré en détail 48 tombeaux de deux diocèses. Les décors des tombeaux ne sont pas figurés seulement au point de vue de matériaux et de techniques, on a aussi étudié leurs thèmes iconographiques et leurs motifs ornaméntaux. Le chapitre VI présente la conclusion principale de la thèse. Il évoque sous en résumé l’influence directe de l’art de l’Asie Mineure ainsi que l’influence indirecte de l’art des terres italiques. Le riche répertoire de thèmes est accompagné d’une large palette d’interprétations créatrices et de solutions techniques. Á la fin de la période, la peinture funéraire disparait. Ce fait nous incite à établir un lien avec le changement du rite funéraire. D’autre part, le matériau archéologique permet de constater un développement important de l’art figuratif pendant cette période. Ainsi la peinture murale rend-elle prioritaires d’autres structures architecturales, notamment les basiliques, les églises et les baptistaires chrétiens. Les abréviations présentent les publications périodiques et de diverses institutions. On a ajouté une liste des nomes antique des sites et leurs nomes modernes. La bibliographie représentent des sources et des textes antiques, des livre de base, ainsi que des publications sur la peinture antique grecque et romaine, recherche sur des monuments donnés, ainsi que telles présentant des problèmes déterminés sur les matériaux et la technologie de la peinture pariétale. Une liste des sites électroniques est également montrée
The research is presented in two volumes and a DVD record. Volume one represents the text part of the thesis consisting of introduction and 6 chapters with abbreviations, bibliography and indexes. The second volume includes 267 plates and 17 tables.In the introduction has been defined the chronological period of the review spanning through the years of the end of the ІІІd century until the fall of the late antique civilization on the Balkans in the end of the VІth and beginning of the VІІth century AC. A review of the study of the objects in Thracia and Dacia is presented in briefs.In chapter I examined the different analytical methods. The beginning part presents the research of the objects in situ. For the gathering of the information concerning the type of the pigments and adhesives used for realization of the murals, as well as for the differentiation of the qualitative and quantitative characteristics of the ingredient components of the different ground layers there have been used the following analytical methods: pictographic and mineralogical analyses, granulometry, electronic microprobes, CEM, structural Х-ray analysis, AEA-ICP, IR spectrometry and IR Raman spectrometry. The second chapter contains the examination of the different types of materials as: plasters, pigments and adhesives used for the realization of the tomb murals. The results are classified according to belonging to three basic groups – of natural origin, synthetic and mixed pigments. There has been proved that in the beginning of the period there had been used some most expensive pigments in an almost clear form as cinnabar and egyptian blue. However in time the palette gradually got poorer and by the end of the period it became limited to only dark red pigments (red ochre, rarely accompanied by green pigment (green earth). The results of the type of the adhesives used for the realization of the murals are presented in particulars. The use of non-organic adhesive - calcium hydroxide has been found. In Chapter ІІІ there are reviewed the picturesque technique and system of implementation. There has been defined the main technique a fresco, however the presence of other techniques has been also found. The constatations made in all previous chapters are summarized in Chapter ІV. In a chronological plan there were reviewed the materials and techniques which were in use. The Chapter V in details are presented all available tombs with painting murals, that were a subject of the present research. The murals have been outlined not only in the perspective of the implemented materials and techniques of realization, but also from the position of the analysis of the ornamental motives and iconographic system. The Chapter VI presents the main conclusion of the thesis. The direct influence of the art of Asia Minor is given in summarized form, as well as the indirect one – through the art of the land of Italy, for example. The rich repertoire of subjects is accompanied by a wealth of creative interpretations and technical solutions. The wall painting became a priority of the Church architecture at the end of Late Antiquity, which has also been proven by archaeological surveys. The palette of colours and technique of application used in tomb art found new implementation in depicting images of the already regulated Christian art in church architecture. The abbreviations contain periodical press publications and public institutions. There has been attached a list with the names of the archeological objects as known in ancient and contemporary time. The bibliography contains: the ancient authors, basic sources of information, specialized researches and publications on roman and late antique painting, publications on particular cultural monuments, as well as expert publications focused on specific problems of the materials and technology research

Northeastern British Columbia was occupied by the Cordilleran (CIS) and the Laurentide (LIS) ice sheets, however, the timing and extent remains contentious. The late Quaternary and Holocene history of this area is examined by exploring geomorphic, stratigraphic, geochemical and geochronologic components of glacial, deglacial, paraglacial and non-glacial landsystems. New tools, such as GIS, LiDAR, and new geochronologic methods, such as optical dating are used to understand the Quaternary geology and geomorphology of the region. Bedrock topography represents the base of the Quaternary section and modelling shows that paleovalleys, common in this region, host extensive Neogene sedimentary records. Stratigraphies from the Murray and Pine valleys indicate glaciation prior to the Mid-Wisconsinan (MIS 3) and during the Late Wiconsinan (MIS 2). Glacial landforms record Late Wisconsinan ice-sheet coalescence and reflect the complex interaction of the LIS and CIS margins. During deglaciation, the LIS and CIS separated and glacial Lake Peace (GLP) formed. Shoreline features enable reconstruction of lake and ice configurations. Four phases of GLP are preserved. Optical ages from Phase II indicate GLP occupied the area some time between ca. 16 – 14 ka yrs ago. The apparent tilt on the shorelines provides a measure of isostatic adjustments and suggests asynchronous retreat of first the LIS, then the CIS. The transition from paraglacial to boreal conditions was driven by climate change and is recorded by vegetation sucession and cessation of paraglacial processes. Optical ages from stabilized dunes and radiocarbon ages from organics date the transition between 12 – 11.5 ka yrs ago with full boreal conditions established by 10 ka yrs ago. The Holocene is dominated by erosional processes, however some systems are aggrading. A case study on a floodplain demonstrates that resistivity (Ohmmapper) surveys provide a grain-size proxy to suppliant GPR studies, which is essential for geophysical fluvial architectural analysis. In the study, the discrepancy between planform style (classic meander model) and subsurface geophysical surveys (indicative of vertical accretion associated with braided and wandering fluvial styles) reiterates cautions that planform may not always be a functions of depositional process and one may not be used to predict the other.
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The Late Neogene sedimentary sequence of the Murray Basin provides an excellent opportunity to examine paleoenvironmental change across southeastern Australia. A detailed stratigraphic analysis of sediments deposited within the basin in the last 10 Ma was undertaken to assess the influence of tectonic and eustatic processes on deposition.
Stratigraphic observations and radiogenic isotope analysis reveals the onset of deposition by 7.2 Ma with a transgressive episode that deposited the marine marls of the Bookpurnong Beds. Deposition was restricted to the central and eastern parts of the basin due to the Hamley Fault. In the west, subsurface elevation contours indicate the presence of incised paleodrainage channels above Miocene limestones, which facilitated the formation of a large estuary system at 5.3 Ma. The sediments of the Norwest Bend Formation were deposited within this western region, while further east, the Loxton-Parilla Sands strandplain deposited over 214 coastal ridges. The basal parts of this unit occur as lateral equivalents to the sediments of the Lower Norwest Bend Formation (in the west). Topographic and magnetic data reveal that tectonism was active during this period and resulted in the erosion and truncation of strandlines.
Tectonic evidence and an estimated minimum 28,037 year cyclicity between strandline sets, suggests that the Loxton-Parilla Sands strandlines do not represent an unbroken record of glacioeustatic change. The subaerial exposure of these sediments at approximately 3.0 Ma caused the formation of a calcareous karst above the Norwest Bend Formation and a ferruginous and/or silicious cap (the Karoonda Surface) above the Loxton-Parilla Sands. The stratigraphic position of these surfaces are indicative of a regional widespread unconformity.
The Douglas-Blackburn paleodrainage system in western Victoria was dammed during the Mid-Late Pliocene by uplift associated with the Padthaway High, which caused the formation of a 400,000 km2 lacustrine system, known as Lake Bungunnia. Topographic analysis indicates that Lake Bungunnia comprised at least four distinct sub-basins with water depths of up to 30 metres, with lake shorelines indicating that active tectonism occurred during this period. The resulting lack of sediment input to the coast caused the formation of the Kanawinka Escarpment, a large erosional scarp along the southern margin of the Padthaway High.
The geomorphology of the modern Murray Basin can be directly attributed to the demise of the Lake Bungunnia system. Movement along the Morgan Fault in the west at approximately 700 Ka, resulted in the draining and progressive drying of Lake Bungunnia as a breach was created along the Padthaway High. The Murray River gorge as observed today was incised following this episode. The modern Murray River (and playa lakes such as Lake Tyrell) occupy the lowest elevations along the former sub-basins of Lake Bungunnia.
The Late Neogene sedimentary sequence across the Murray Basin illustrates a complex interaction of eustatic and tectonic processes on deposition. Sedimentation within strandline, estuarine and lacustrine systems, particularly in the western Murray Basin, display evidence of significant tectonic control. This highlights the important role that neotectonic processes have played in shaping southeastern Australia.

This study was designed with the overriding goal of improving our understanding of the nature, causes, and impacts of past climatic conditions in the High Arctic and to evaluate the potential impacts of future climatic warming. Specifically, the focus of this project was centered on Upper and Lower Murray Lakes (81° 21' N, 69° 32' W) on northern Ellesmere Island, Nunavut, Canada. Sediment cores were collected from each of the lakes in order to reconstruct past climate and environmental variability and space-borne synthetic aperture radar (SAR) data were used to evaluate recent variability in the ice cover of these lakes. The climatic setting and physical characteristics of Lower Murray Lake has led to the formation and preservation of annually laminated sediments (varves). Varve deposition began ca. 5200 calendar years BP and continued through 2004 AD, providing an annual record of sediment accumulation spanning the past 5200+ years. Annual mass accumulation was correlated to regional July temperatures providing a means of quantitatively evaluating past temperature changes in the region. The temperature reconstruction suggests that recent temperatures are ∼2.6°C higher than minimum temperatures observed during the Little Ice Age, maximum temperatures during the past 5200 years exceeded modern values by ∼0.6°C, and that minimum temperatures observed approximately 2900 varve years BC were ∼3.5°C colder than recent conditions. SAR observations of the ice cover Upper and Lower Murray Lake were used to assess the potential effects of past and future temperatures on lake-ice conditions. Under current climatic conditions the lakes average several weeks of ice-free conditions in August and early September, although in some years a continuous ice cover persists throughout the year. The relationship between summer temperature and ice melt at the lakes suggests that recent warming in the High Arctic has forced the lakes across a threshold from a state of perennial ice cover to seasonal melting. Projected future warming will significantly increase the duration of ice free conditions on Upper and Lower Murray Lakes. Ice-out is predicted to occur between 6 and 28 days earlier for every 1°C of warming.

In this study, the development and testing of a finite-difference model for wind-induced flow in shallow lakes, and, in particular, a new technique for improving the land--water boundary representation, are documented. The model solves nonlinear, as well as linear, versions of the two-dimensional depth-integrated shallow water equations. Finite-difference methods on rectangular grids are widely used in numerical models of environmental flows. In these models, land--water boundaries are usually approximated by a series of perpendicular line segments, which enable the impermeability condition to be easily implemented. A disadvantage of this approach is that the actual boundary is often poorly approximated, particularly in regions which have complicated coastlines, and, as a result, currents in these regions cannot be accurately predicted. A technique for improving the land--water boundary representation in finite-difference models is introduced. This technique permits the model boundary to contain diagonal line segments, in addition to the vertical and horizontal line segments used in traditional models. The new technique is based on a simple concept and can easily be included in existing finite-difference models. In order to test the new method, the linearised shallow water equations are solved numerically for oscillatory wind-driven flow in lakes with simple geometry. Predictions obtained using the new approach are compared with predictions from the traditional stepped boundary and known analytic solutions. A significant improvement in the accuracy of results is noticed when the new approach is used, particularly in currents close to shore. The increased accuracy obtained using the improved boundary representation can lead to a significant computational saving, when compared with running the rectangular grid model with smaller grid spacings. A second-order analytic solution to the nonlinear shallow water equations is developed for oscillatory wind-driven flow in a rectangular lake. Comparisons between this solution and numerical results, obtained using the traditional stepped boundary and the improved boundary, verify the finite-difference formulae used in these models, including the approximations used for the cross-advective terms close to shore. Once more, currents are predicted with greater accuracy when the new technique for representing the land--water boundary is implemented. The lake circulation model is applied to the Lower Murray Lakes, South Australia, and predicted water levels at Tauwitchere Barrage are shown to agree very well with observations. The model is then used to examine the effectiveness of two schemes that have been proposed to increase wind-induced circulation, and therefore potentially decrease salinity, in Lake Albert, demonstrating the model's use as an efficient and effective tool for analysing flow behaviour in lakes.
Thesis (Ph.D.)--Mathematical Sciences (Applied Mathematics), 2005.

This study provides a biological perspective on the potential of using year-round sanctuaries to protect largemouth bass (Micropterus salmoides). Although the Rideau Lakes bass sanctuaries have been present for more than 70 years, a lack of empirical rationale has resulted in a considerable debate regarding their usefulness. Using radio telemetry in Lake Opinicon, Ontario, the current study indicates that largemouth bass behaviour is influenced by the structural complexity of the habitats they occupy. In high-structure habitats, bass tend to have smaller utilization areas, displacement rates and radial displacements relative to those occupying low-structure habitats. All largemouth bass were captured and released (after transmitter implantation) in high-structure areas; however, more than half (12 of 23) of these individuals made spring (closed fishing season) relocations to low-structure areas where most (11 of 12) remained for the duration of the study. Behaviour is important to consider because of the influence it has on the level of sanctuary protection received by a largemouth bass. Twelve individuals began the study in the high-structure habitats of Lake Opinicon’s Murphy Bay fish sanctuary; however, only five remained in high-structure habitats throughout the study to receive full open season protection, two others received partial protection and four largemouth bass received no open season sanctuary protection because they made spring relocations to low-structure areas outside of the sanctuary. The results of this study provide an important biological perspective for the evaluation of year-round bass sanctuaries. Further research is needed to understand the specific causes of observed behaviours and to investigate how open and closed season protection of a year-round sanctuary translates into overall bass fishery benefits. Therefore, we recommend the maintenance of the Rideau Lakes bass sanctuaries as year-round regulations until there is sufficient empirical evidence to support their re-designation or removal.
Thesis (Master, Biology) -- Queen's University, 2010-04-01 01:39:20.969

In this dissertation, I examine the political organization of Maya states during the Classic period (AD 550-950) through the workings of an institutional order whose practices came to light in excavations at Xultun, Guatemala. Archaeological, artistic, and epigraphic evidence shows that members of this order, called Taaj, lived, worked and instructed others at a household compound called Los Sabios. Members specialized in indigenous Maya sciences and high-level ritual that were instrumental in the organized, astronomically-timed public ceremonies and crafted spectacles by which local sovereigns communicated and maintained political authority. The Taaj order first surfaced on a mural found within a small, central structure of Los Sabios. The artist(s) depicted three male Taaj members and two novices dressed in uniforms and labeled with ranked titles, with a high-ranking Taaj gesturing in ritual toward the enthroned ruling sovereign as the other Taaj look on. The mural also served as a palimpsest for scientific and astronomical calculations painted over and around the figures of the scene. Eventually, residents closed off this mural room and converted it into a mausoleum under which they buried a man dressed in the same uniform as the Taaj depicted on the mural. As household sub-floor burials were typical among the Maya, this discovery affirms that these Taaj resided at Los Sabios. Papermaking tools found throughout the residence suggest the Taaj recorded their scientific and ritual knowledge in barkpaper books. Such tools were also found buried with a woman at Los Sabios, showing her key role in creating books alongside the Taaj, despite her omission from the mural. Taaj has long been overlooked as a title, but my reconsideration of the term as it occurs elsewhere reveals its widespread use as such and indicates these Taaj figures existed throughout Maya area. These discoveries shed unexpected new light on governance and social organization among the Maya. Together, they reveal a political structure in which rulers relied on the expertise and secret knowledge of the Taaj to help sustain local systems of sovereignty as well as forms of class-based inequality that characterized Classic Maya society until the time of its collapse.
2017-05-01