Gordon jason masters thesis
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Computer networks, internet and mobile computing. Computer vision and computer graphics. Computing education. Human-computer interaction. An infill well is proposed based on integration of this data. Techniques developed herein can be usefully applied to other reservoirs in the Lower and Middle Frio in the Corpus Christi Bay area. The purpose of this project is to understand the factors that led to the development of phylloid algal bioherms in the Wolfcampian Lower Permian Laborcita Formation, Sacramento Mountains, New Mexico.
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The Laborcita Formation outcrops consist of a narrow, 27 km long strip with a maximum thickness of m. It is defined as the transitional beds interfingering between the underlying Pennsylvanian Holder Formation marine carbonates, and the overlying Wolfcampian Abo Formation terrestrial red beds. The outcrops of the Laborcita Formation are generally situated oblique to depositional dip, and display dramatic lateral facies changes from terrestrial red beds in the south to spectacular open marine phylloid algal bioherms in the north.
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My study area encompasses the northern biohermal portion of the formation. I measured ten sections which formed the basis for my cross section. The biohermal portion of the formation is parallel with depositional strike, and lateral facies changes are minimal.
I identified four depositional environments: fluvial, restricted marine, deltaic, and open marine. The recurrent stratigraphic motif in the northern part of the Laborcita Formation consists of deltaic progradation during relative sea level highstand, aggradation of fluvial or restricted carbonate facies during lowstand, and most spectacularly, growth of phylloid algal bioherms during transgression.
The stratigraphic context and modern and Late Paleozoic analogs of the Laborcita Formation phylloid algal bioherms all suggest that their maximum development occurred during relative sea level transgression.
The ubiquity of deltas and the ample evidence for syndepositional tectonism in the northern portion of the Laborcita Formation suggest that sediment supply and tectonism are the principal controls on sequence development. The Laborcita Formation bioherms occur on top of regional deltaic sand thicks. This suggests that abandoned delta lobes formed platorms suitable for bioherm development. Upwelling of reducing, nutrient-rich waters may help explain the enhanced Late Paleozoic bioherm growth in the Orogrande basin. The University of Texas at Austin May, Supervisor: Sharon Mosher return to list.
Harrison, M. Richard Kyle The Grasberg is a gold-rich porphyry copper deposit located at the crest of the Central Range of Irian Jaya and is the largest orebody of the prolific Ertsberg District. The deposit is hosted within a nested suite of 3 Ma quartz monzonite to quartz monzodiorite intrusions. Currently the units of the Grasberg are divided into three groups of intrusions.
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The units are all porphyritic and very similar petrographically. To date, textural criteria regarding the percentage and character of phenocryst phases serve as the best manner to differentiate between units. Two distinct types of alteration affect the rocks of the Grasberg that show consistent spatial arrangements throughout the deposit.
These expressions of alteration are interpreted to be similar to or variations of the K-silicate and phyllic alteration styles described in other porphyries. Other frequently recognized alteration types noted in similar deposits, such as propylitic and advanced argillic alteration, are largely absent but may have been better-developed in the eroded or excavated portions of the complex. Temporally late veins are strongly associated with sericite-rich selvages suggesting that the conditions of late vein-forming fluids were similar to the fluid conditions responsible for the phyllic alteration pervasive at the margins of the complex.
If fluids responsible for vein formation and the development of pervasive wall-rock alteration can be linked, than mineralizing veins appear to occur temporally between the development of the two alteration styles identified. Alteration at Grasberg is arranged concentrically and symmetrically around the youngest Kali intrusion. Note however that pervasive alteration and high-grade Cu-Au mineralization are observed within the Kali near contacts with other lithologies. Major-oxide and trace-element analyses of altered samples, when compared to average unaltered compositions, generally show that samples affected by K-silicate alteration are enriched in Fe 2 O 3 , MgO and K 2 O, while SiO 2 concentrations were elevated overall within phyllic-altered samples.
The trace-element data generally mimicked trends observed in the major-oxide data and secondary mineral abundance is believed to exert the strongest control on compositions of altered samples.
The exception to secondary mineral abundance controlling the compositions of altered rocks is Na 2 O which likely reflects the relative preservation of plagioclase phenocrysts rather than an alteration phase. Stable isotope measurements performed on mineral separates prepared to represent major expressions of alteration suggest that Grasberg's hydrothermal system was predominantly magmatic throughout the course of its development.
The objectives of this investigation were to evaluate a visual velocity analysis technique and to determine a velocity function for improved imaging of a three-dimensional seismic reflection data set. The data were collected at the northern Barbados ridge accretionary complex, located at the Lesser Antilles active margin. The specific purpose of the high resolution 3-D survey was to examine the structural development of the accretionary prism, for which accurately migrated seismic sections are essential. The interior structure of the prism was not well-resolved in the initial migrated images because of poorly known velocities.
The velocity analysis technique consisted of using seismic data movies to extract velocity information from the near zero-offset 3-D data. This technique exploits the fact that zero-offset data contain wide-angle information in the form of diffractions and discordant dipping specular reflections.
Because migration is sensitive to velocity, we performed 3-D migrations of the data using a series of trial velocities to determine the velocity empirically. Seismic data movies display a sequence of frames of the same seismic section migrated at different velocities to show how the image changes with velocity.
Velocities derived from the movies were used to construct a 3-D migration velocity function. The re-migrated seismic sections provide enhanced images of steep features in the seismic data, such as faults in the prism, which improve structural interpretation of the data set. Although this basin has been exploited for several decades, it lacks a reliable regional depositional framework that correctly classifies the different plays and provides a valid sedimentological model for advanced recovery techniques.
This study is designed to understand and classify the FDE within a regional structural-stratigraphic context. The methodology used is not new, but this is the first time that it has been applied to this area. Nine dip oriented and three strike oriented well log cross sections were used to correlate and subdivide the FDE and to make a series of isopach, net sandstone, sandstone percentage, and log facies maps for the Upper, Middle and Lower FDE. The Norma fluvial system is located in the central-western part of the area, and consists of a bed-load channel-fill, aggradational streamplain, and floodplain facies.
The large volume of clastic sediments supplied to the basin formed a deltaic sequence over undercompacted prodelta and slope muds, thus causing the development of syndepositional faults i. The delta-front sediments were reworked and transported by waves and coastal currents in the strike direction southward along the ancient coast; the sediment transport formed strike elongated strandplain, coastal bar, and spit sand bodies.
checkout.midtrans.com/vejer-de-la-frontera-speed-dating-opiniones.php Based upon maps, facies successions, and core descriptions, the Reynosa delta system is proposed to be a wave-dominated to wave-modified delta system. This study challenges the barrier bar system model proposed in the 's as the primary depositional system for the FDE. The Conglomerado Norma was deposited as coalesced, aggradational fluvial channel deposits on this surface in the later FDE.