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Colorado School of Mines
1.
Card, Christopher Tyler.
Qualitative image based localization in a large building.
Degree: 2015, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1587434 
► Interest in indoor localization is growing because it is an important component of many applications (e.g. augmented reality, customer navigation). Image-based localization, using naturally-occurring…
(more)
▼ Interest in indoor localization is growing because it is an important component of many applications (e.g. augmented reality, customer navigation). Image-based localization, using naturally-occurring features in the environment, is an attractive solution to this problem. A challenge is to be able to perform this on a mobile device with limited computing power. Another challenge is that buildings can have interior locations with similar appearances, which can confuse an image-based recognition system. Since many applications do not need the exact location of an image, this research focuses on qualitative localization, which is the problem of determining the approximate location by matching a query image to a database of images. This paper proposes a novel approach that uses an efficient hashing scheme to quickly identify candidate locations, then applies a strong geometric constraint to reject matches that have similar appearance. Through experiments using a large campus building, the approach is shown to be able to localize a query image with high accuracy and have the potential to run in real time on a mobile device.
Subjects/Keywords: Computer Science
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APA (6th Edition):
Card, C. T. (2015). Qualitative image based localization in a large building. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1587434
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Card, Christopher Tyler. “Qualitative image based localization in a large building.” 2015. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=1587434.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Card, Christopher Tyler. “Qualitative image based localization in a large building.” 2015. Web. 22 Sep 2017.
Vancouver:
Card CT. Qualitative image based localization in a large building. [Internet] [Thesis]. Colorado School of Mines; 2015. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1587434.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Card CT. Qualitative image based localization in a large building. [Thesis]. Colorado School of Mines; 2015. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1587434
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
2.
Kohnke, Colton J.
Electromagnetic effects of steel-cased wells.
Degree: 2017, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10254924
► In oil and gas production environments, controlled-source electromagnetics can be used to aid brownfield exploration, development, and reservoir monitoring efforts. However, such environments typically…
(more)
▼ In oil and gas production environments, controlled-source electromagnetics can be used to aid brownfield exploration, development, and reservoir monitoring efforts. However, such environments typically have many highly conductive steel-cased wells in the area of interest. In this paper, we present a modeling algorithm using a method of moments approach to calculate the electromagnetic response of multiple 3D steel-cased wells of arbitrary geometry in a layered earth conductivity model. First, we divide each casing into a collection of segments, each carrying a uniform current density. Next we create a matrix that describes how the casing segments interact with each other electromagnetically. Then we solve a linear system for the current within each casing segment, given a transmitter of arbitrary frequency and location. From these currents we are able to solve for the secondary electromagnetic fields produced solely by the casings at any point in our layered model, and add these to the primary fields produced by the transmitter. To validate the algorithm, we compare results with the pseudo-analytic method of moments algorithm for a single vertical casing in a halfspace. We also compare results with a finite-element solution using COMSOL for both a single vertical and single tilted well buried in a layered earth. Results show a good match between these different approaches, which improves with increasing subsurface resistivity. Finally, we apply our algorithm to a realistic synthetic model with three casings (one vertical and two deviated) extending into a layered earth model containing the classic thin resistive layer. This example illustrates how the algorithm can be used to compute the electromagnetic response of multiple steel-casings. The example also illustrates how the electromagnetic field changes due to the presence of the casings and how signal is able to be injected at depth by utilizing the casing.
Subjects/Keywords: Geophysics; Geophysical engineering; Electromagnetics
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APA (6th Edition):
Kohnke, C. J. (2017). Electromagnetic effects of steel-cased wells. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10254924
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kohnke, Colton J. “Electromagnetic effects of steel-cased wells.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=10254924.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kohnke, Colton J. “Electromagnetic effects of steel-cased wells.” 2017. Web. 22 Sep 2017.
Vancouver:
Kohnke CJ. Electromagnetic effects of steel-cased wells. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10254924.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kohnke CJ. Electromagnetic effects of steel-cased wells. [Thesis]. Colorado School of Mines; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10254924
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
3.
Lozano, Eduardo.
Design and analysis of a personnel blast shield for different explosives applications.
Degree: 2016, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10157345
► The use of explosives brings countless benefits to our everyday lives in areas such as mining, oil and gas exploration, demolition, and avalanche control.…
(more)
▼ The use of explosives brings countless benefits to our everyday lives in areas such as mining, oil and gas exploration, demolition, and avalanche control. However, because of the potential destructive power of explosives, strict safety procedures must be an integral part of any explosives operation. The goal of this work is to provide a solution to protect against the hazards that accompany the general use of explosives, specifically in avalanche control. For this reason, a blast shield was designed and tested to protect the Colorado Department of Transportation personnel against these unpredictable effects. This document will develop a complete analysis to answer the following questions: what are the potential hazards from the detonation of high explosives, what are their effects, and how can we protect ourselves against them. To answer these questions theoretical, analytical, and numerical calculations were performed. Finally, a full blast shield prototype was tested under different simulated operational environments proving its effectiveness as safety device. The Colorado Department of Transportation currently owns more than fifteen shields that are used during every operation involving explosive materials.
Subjects/Keywords: Mechanical engineering; Physics
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APA (6th Edition):
Lozano, E. (2016). Design and analysis of a personnel blast shield for different explosives applications. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10157345
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lozano, Eduardo. “Design and analysis of a personnel blast shield for different explosives applications.” 2016. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=10157345.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lozano, Eduardo. “Design and analysis of a personnel blast shield for different explosives applications.” 2016. Web. 22 Sep 2017.
Vancouver:
Lozano E. Design and analysis of a personnel blast shield for different explosives applications. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10157345.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lozano E. Design and analysis of a personnel blast shield for different explosives applications. [Thesis]. Colorado School of Mines; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10157345
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
4.
McClave, Graham A.
Stratigraphy and source rock analyses of the Heath Formation in Fergus, Garfield, Golden Valley, Musselshell, Petroleum, and Rosebud counties, central Montana.
Degree: 2013, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1529698
► The Mississippian Heath Formation is recognized as the key source rock for the Heath-Tyler-Amsden (!) petroleum system in the Big Snowy Trough of central…
(more)
▼ The Mississippian Heath Formation is recognized as the key source rock for the Heath-Tyler-Amsden (!) petroleum system in the Big Snowy Trough of central Montana which has produced an estimated 137 million bbl of oil to date from conventional traps. Due to the limited amount of conventional production to date within this petroleum system over the region's 90 year history of development, and estimates that 60% of total generated oil still remains in place within the source rock, the Heath is well suited for being assessed as a resource play. This research project is designed around addressing this possibility. Specifically it seeks to gain a thorough understanding of the Heath's potential as a resource play, and does this by meeting two primary objectives: 1) conducting a petroleum system analysis of regional stratigraphy in the Big Snowy Trough of central Montana with an emphasis toward identifying the Mississippian Heath Formation's contribution to this system, and 2) performing a source rock assessment of the Heath Formation. The results drawn from meeting these objectives lead to establishing the view of the Heath as its own stand-alone petroleum system that can potentially serve as a resource play target. The stratigraphic analysis yielded the following observations. Thickness of the Heath varies regionally from 150-450 ft, and its present depth ranges from outcropping at the surface to occurring at 6,000 ft total vertical depth, while averaging around 3,000-6,000 ft within the central region of the trough. It is composed of various marine lithologies including mostly black micritic shale interbedded with thin fossiliferous limestone and dolomite stringers, and minor gypsum/anhydrite occurrences. The most organic-rich zone of the Heath, the Cox Ranch shale unit, ranges from 5-25 ft in thickness, and is composed of finely-laminated micritic black shale. Adjacent to this organic zone is the informally defined Heath B carbonate unit (from this study) which is composed of interbedded limestone, dolomite and shale. The carbonate beds within this interval are thin (2-5 ft thick), but generally are more developed and more prevalent in the southern region of the study area. Less organic-rich shale intervals occur abundantly in the Upper and Lower Heath units that are informally defined in this study. The source rock analysis provided the following results. Programmed pyrolysis, TOC, and vitrinite reflectance data for the Heath shales indicate very good source rock character. Within the Cox Ranch section, TOC wt. % ranges from 0.5-26% and averages 9% with S2 peak values averaging 20 mg HC/g rock. Kerogen type analyses point mainly to Type I/Type II kerogen, while Tmax suggests marginal maturity to oil window maturity with values ranging from 420 to 449 deg C. Maps of the thermal maturity parameters indicate a salient zone of oil maturity in the south-central region of the study area. Burial history and thermal maturity models from southern wells indicate oil expulsion from the Heath with…
Subjects/Keywords: Geology; Petroleum Geology; Sedimentary Geology
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APA (6th Edition):
McClave, G. A. (2013). Stratigraphy and source rock analyses of the Heath Formation in Fergus, Garfield, Golden Valley, Musselshell, Petroleum, and Rosebud counties, central Montana. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1529698
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
McClave, Graham A. “Stratigraphy and source rock analyses of the Heath Formation in Fergus, Garfield, Golden Valley, Musselshell, Petroleum, and Rosebud counties, central Montana.” 2013. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=1529698.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McClave, Graham A. “Stratigraphy and source rock analyses of the Heath Formation in Fergus, Garfield, Golden Valley, Musselshell, Petroleum, and Rosebud counties, central Montana.” 2013. Web. 22 Sep 2017.
Vancouver:
McClave GA. Stratigraphy and source rock analyses of the Heath Formation in Fergus, Garfield, Golden Valley, Musselshell, Petroleum, and Rosebud counties, central Montana. [Internet] [Thesis]. Colorado School of Mines; 2013. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1529698.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McClave GA. Stratigraphy and source rock analyses of the Heath Formation in Fergus, Garfield, Golden Valley, Musselshell, Petroleum, and Rosebud counties, central Montana. [Thesis]. Colorado School of Mines; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1529698
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
5.
Hurley, Christoph.
Development of ammonium nitrate based explosives to optimize explosive properties and explosive welding parameters used during explosion cladding.
Degree: 2013, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1533025
► The ability to accurately measure and predict the velocity of explosively driven flyer plates has been a subject of significant work by the explosives…
(more)
▼ The ability to accurately measure and predict the velocity of explosively driven flyer plates has been a subject of significant work by the explosives community for some time. The majority of this work has focused on the use of high-energy, ideal explosives that are of interest for defense applications. Several attempts have been made to modify the experimental methods developed for these ideal explosives for use in testing low-energy, non-ideal explosive compounds (including industrially useful mixtures of ammonium nitrate, fuels, and additives) with varying degrees of success. The detonation properties of non-ideal explosives are difficult to measure precisely due to the effect of physical, environmental, and geometric factors on the detonation of these materials. The work presented in this document attempts to mitigate the variability inherent in measurements of non-ideal, ammonium nitrate-based explosives by performing testing using charge geometry similar to that used in the industrial process of explosion welding. A method to measure flyer plate velocity with optical high-speed imaging using commercially available equipment is described. Flyer plate velocity data from both experimental measurements and numerical modeling is presented. A new formula for predicting explosive energy based on the detonation velocity of an ammonium nitrate based explosive in a planar geometry is proposed and applied to a theoretical explosive cladding scenario.
Subjects/Keywords: Engineering, Mining; Engineering, Materials Science
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APA (6th Edition):
Hurley, C. (2013). Development of ammonium nitrate based explosives to optimize explosive properties and explosive welding parameters used during explosion cladding. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1533025
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hurley, Christoph. “Development of ammonium nitrate based explosives to optimize explosive properties and explosive welding parameters used during explosion cladding.” 2013. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=1533025.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hurley, Christoph. “Development of ammonium nitrate based explosives to optimize explosive properties and explosive welding parameters used during explosion cladding.” 2013. Web. 22 Sep 2017.
Vancouver:
Hurley C. Development of ammonium nitrate based explosives to optimize explosive properties and explosive welding parameters used during explosion cladding. [Internet] [Thesis]. Colorado School of Mines; 2013. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1533025.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hurley C. Development of ammonium nitrate based explosives to optimize explosive properties and explosive welding parameters used during explosion cladding. [Thesis]. Colorado School of Mines; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1533025
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
6.
Tello Araya, Karem E.
Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum.
Degree: 2012, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3546038
► The Ti-Pt phase binary phase diagram and the corresponding phase transformations in the composition range 30-50 at.% Pt have been investigated using a variety…
(more)
▼ The Ti-Pt phase binary phase diagram and the corresponding phase transformations in the composition range 30-50 at.% Pt have been investigated using a variety of characterization methods (DTA, SEM and TEM). This study was inspired by ongoing work on some experimental Ti-Ni-Pt and Ti-Pt-Ni-Hf high temperature shape memory alloys that were found to contain unexpected phases not reported previously in such alloys. Furthermore, close analysis of the peritectoid invariant proposed by Biggs <i>et al.</i> revealed a range of confusing and somewhat contradictory results and, as a result, it was decided to attempt to determine the true nature of the diagram in this composition range and to understand the complicating effects of interstitial contamination on the observed microstructures and phase equilibria. The microstructure of as-cast and heat treated alloys contains more than two phases after equilibration treatments suggesting interstitial contamination. In addition, the microstructures revealed that the peritectoid transformation (Ti3Pt+β-TiPt[special characters omitted]Ti4Pt3) proposed in the literature exists but, because of sluggish transformation kinetics, the actual peritectoid reaction is limited and does not account for the observed DTA peaks that Biggs <i> et al.</i> used to estimate the invariant temperature. Rather, it will be shown that the peaks are due to the transformation of β-TiPt to a lamellar β-TiPt+Ti4Pt3 structure at approximately 1230 °C. In addition, a modification to the phase diagram is proposed based on other experimental evidence. Characterization of the various phases observed in the microstructures (using SADP and CBED in the TEM) confirmed the presence of the known phases Ti3Pt and α-TiPt. In addition, a new phase with stoichiometry Ti5Pt3 was observed in both as-cast and heat treated samples. This phase is shown to be stabilized by oxygen and to have a hexagonal structure with lattice parameters <i>a</i> ∼ 8.0 nm and <i> c</i> ∼ 5.0 nm (space group P63/mcm). The Ti4Pt 3 phase appears to be a true binary phase that tends to be highly faulted and be structurally related to the Ti5Pt3 phase with a pseudo-hexagonal structure with <i>a</i> ∼ 7.96 nm and <i> c</i> ∼ 23.6 nm. Detailed electron diffraction evidence indicates that the crystal structure is probably triclinic although it was difficult to determine the actual point and space group.
Subjects/Keywords: Engineering; Materials Science
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APA (6th Edition):
Tello Araya, K. E. (2012). Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3546038
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tello Araya, Karem E. “Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum.” 2012. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=3546038.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tello Araya, Karem E. “Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum.” 2012. Web. 22 Sep 2017.
Vancouver:
Tello Araya KE. Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum. [Internet] [Thesis]. Colorado School of Mines; 2012. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3546038.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tello Araya KE. Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum. [Thesis]. Colorado School of Mines; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3546038
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
7.
Worrall, Dan M., Jr.
Modeling gas flows in longwall coal mines using computational fluid dynamics.
Degree: 2012, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3546041
► Longwall coal mines have been a major and growing source of coal production in the United States for decades. The geological and geochemical nature…
(more)
▼ Longwall coal mines have been a major and growing source of coal production in the United States for decades. The geological and geochemical nature of coal seams means that methane is frequently present in the coal and surrounding strata of longwall mines. The human coal miners require oxygen to work in these environments, so complex ventilation systems are developed to deliver fresh air to the underground mine. An additional goal of the ventilation system is to prevent explosive mixtures of methane and oxygen from forming in the mine, including within the gob. A computational fluid dynamics (CFD) model was created that accurately simulates the mixing of gases in longwall coal gobs. The longwall panel model simulated the phase leading up to and including shield recovery and therefore examines the ventilation and hazards during that phase of the operation. Special attention was paid to the interaction of gases in the gob, a rubblized zone of rock, potentially methane rich, that is created as the longwall retreats. In order to accurately model behavior, a parallel research used a commercial software package to predict the permeability and porosity of the gob (Wachel, 2012). When coupled with FLUENT, a commercially available CFD software package, a flow model was created that calculated gas concentrations which matched several known monitoring sites in a currently operating longwall mine. Qualitatively, the model's predictions also appeared to conform to observed operating conditions giving further confidence in the model. The validated model framework was used to run many hundreds of simulations. The results of the completed simulations support a number of conclusions. This research suggests that progressively sealed, bleederless longwall panels should strive to maximize nitrogen injection into the headgate side of the panel without creating unsafe low oxygen concentrations in the tailgate return. Nitrogen injected in the tailgate of the panel had a much lower impact on gob safety, but is likely still necessary to sweep the tailgate entries separated from the ventilation system by isolation stoppings as the face advances. The second recommendation of this research is that, while the general shield recovery process used by bleederless longwall panels appears safe, nitrogen should be injected behind the shields in the center of the ventilation circuit to mitigate the hazard created by the build up of high methane environments in the gob immediately behind the shields. Finally, the results suggest that minimizing the concentration of methane in the tailgate return does not always ensure that the optimum methane concentration for the entire longwall gob is being achieved.
Subjects/Keywords: Engineering, Mechanical; Engineering, Mining
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APA (6th Edition):
Worrall, Dan M., J. (2012). Modeling gas flows in longwall coal mines using computational fluid dynamics. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3546041
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Worrall, Dan M., Jr. “Modeling gas flows in longwall coal mines using computational fluid dynamics.” 2012. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=3546041.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Worrall, Dan M., Jr. “Modeling gas flows in longwall coal mines using computational fluid dynamics.” 2012. Web. 22 Sep 2017.
Vancouver:
Worrall, Dan M. J. Modeling gas flows in longwall coal mines using computational fluid dynamics. [Internet] [Thesis]. Colorado School of Mines; 2012. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3546041.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Worrall, Dan M. J. Modeling gas flows in longwall coal mines using computational fluid dynamics. [Thesis]. Colorado School of Mines; 2012. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3546041
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
8.
Alkuwairan, Maryam Y.
Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait.
Degree: 2013, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3549853
► The origin of dolomite has been enigmatic. It is a common constituent of carbonate hydrocarbon reservoirs, it is abundant in Phanerozoic sedimentary carbonate rocks,…
(more)
▼ The origin of dolomite has been enigmatic. It is a common constituent of carbonate hydrocarbon reservoirs, it is abundant in Phanerozoic sedimentary carbonate rocks, but dolomite is rare in Quaternary and Recent rocks. Many different models have been suggested to explain its origin. Authigenic dolomite has been found to be forming in the Persian Gulf, but rather in small quantities. Additionally, mixing of authigenic dolomite with allochthonous types has been difficult to characterize. While it is clear that dolomite forms under a wide range of geochemical conditions, this study focuses on the occurrence of dolomite in modern sediments in a restricted embayment (Kuwait Bay), whose sediments derive from multiple sources. In this study, recently developed quantitative mineralogical tools (QEMSCAN analyses) were used in conjunction with traditional approaches (XRD, SEM, whole-rock geochemistry, and isotope geochemistry) to characterize polygenetic dolomite types occurring in subtidal sediments in Kuwait Bay. This study is the first to employ these methods to characterize the sediment mineralogy and geochemistry. Dolomite occurs as both authigenic and detrital phases, and analytical techniques have allowed characterization of these different types of dolomite. Three distinct phases of dolomite are present in the sediments: stoichiometric dolomite, near-stoichiometric dolomite, and calcium-rich, poorly ordered dolomite (protodolomite). The data suggest that stoichiometric and near-stoichiometric dolomite are transported (allochthonous/detrital), while the protodolomite is most likely an in situ authigenic precipitate. Allochthonous/detrital dolomite occurs within composite grains that show evidence for transportation. They are typically in the 50 to 150 &mgr;m size fraction. The mineralogic composition and characteristics of the composite grains suggests two likely sources: eolian and fluvial. These detrital dolomites are extrabasinally sourced. However, isolated rhombohedra of pristine dolomite crystals are present in the sediments. These dolomite rhombs are typically less than 10 &mgr;m in diameter, and are calcium rich. They make up about 10% of the total dolomite in the sediments. Their origin is consistent with authigenic microbially mediated dolomite precipitation in organic-rich sediments in hypersaline waters.
Subjects/Keywords: Geology; Mineralogy; Marine Geology; Sedimentary Geology
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APA (6th Edition):
Alkuwairan, M. Y. (2013). Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3549853
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Alkuwairan, Maryam Y. “Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait.” 2013. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=3549853.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alkuwairan, Maryam Y. “Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait.” 2013. Web. 22 Sep 2017.
Vancouver:
Alkuwairan MY. Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait. [Internet] [Thesis]. Colorado School of Mines; 2013. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3549853.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alkuwairan MY. Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait. [Thesis]. Colorado School of Mines; 2013. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3549853
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
9.
Ikard, Scott.
Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams.
Degree: 2014, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3602502
► A monitoring methodology is developed for investigating seepage and internal erosion in earthen dams with time-lapse measurements of self-potential anomalies associated with conservative salt…
(more)
▼ A monitoring methodology is developed for investigating seepage and internal erosion in earthen dams with time-lapse measurements of self-potential anomalies associated with conservative salt and non-conservative heat tracer migration in the subsurface. The method allows for 1) detecting seepage zones in earthen dams and determining the preferential flow paths through seepage zones in a non-invasive manner from the ground surface, 2) monitoring the transient evolution of seepage path geometry, flow velocity, and permeability in real-time if high frequency measurements can be made, and 3) long-term non-invasive monitoring with wired or wireless sensors The method is first theoretically developed and tested in a laboratory using a conservative tracer, and then demonstrated at a 12 m high, 100 m long leaking earthen dam with complex, unknown seepage paths. The method is shown to be capable of rapidly detecting seepage zones discovered during a reconnaissance survey, and delineates the predominant seepage directions through the dam from the time-lapse self-potential anomalies. The time-lapse monitoring approach ensures improved spatial resolution, increased measurement frequencies, and improved data analysis capabilities relative to traditional approaches to seepage detection, and a cost-reduction for the application of this methodology is anticipated to follow advancements in wireless sensing and monitoring technologies. This method is designed to be a more cost-effective means of interrogating earthen dams and levees to answer questions such as: Is the dam safe? What are the geometries of the seepage zones inside of the dam, and over what spatial scale does anomalous seepage occur? What are preferential paths through the seepage zones? Is internal erosion actively occurring? At what rates are the geometries, permeabilities and flow rates of preferential seepage paths evolving?
Subjects/Keywords: Hydrology; Engineering, Geological; Engineering, Geophysical
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APA (6th Edition):
Ikard, S. (2014). Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3602502
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ikard, Scott. “Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams.” 2014. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=3602502.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ikard, Scott. “Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams.” 2014. Web. 22 Sep 2017.
Vancouver:
Ikard S. Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3602502.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ikard S. Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3602502
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
10.
Faber, Ethan J.
Development of a landslide risk rating system for small-scale landslides affecting settlements in Guatemala City.
Degree: 2016, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10014960
► Many settlements in the Guatemala City Metropolitan Area (GCMA) face significant possibilities of fatalities due to their location in steep ravines that are subjected…
(more)
▼ Many settlements in the Guatemala City Metropolitan Area (GCMA) face significant possibilities of fatalities due to their location in steep ravines that are subjected to periodic large-scale landslides. Since the housing in the at-risk areas is relatively low-cost, it is typically cost-prohibitive to mitigate the risk to an acceptable level. Thus, permanent relocation is the only truly viable option to ensure the long-term safety of everyone. However, there are several economic and social obstacles impeding successful implementation of a relocation program. Still, there are many other landslide risk reduction techniques (such as retaining walls, community drainage systems, and alert systems) implemented by government organizations and non-profit groups. These techniques are helpful in landslide risk reduction (LRR), but residents are only partially involved in the entire process. Therefore, increasing residents’ education and ability to better understand their level of landslide risk will help with LRR. Residents can integrate and collaborate with the government organizations and non-profits implementing mitigation techniques and of even greater benefits, the education and ability for residents to understand their landslide risk can provide additional avenues for LRR not otherwise achievable. The purpose of this research is to develop a landslide-risk-rating-system (LRRS) that can be used by trained residents to better understand their risk (similar to other landslide or rockfall hazard-rating systems commonly used by department of transportation organizations). The focus of this LRRS is only on small-scale landslides (typically the size of a house or less) because evaluating the risk of large-scale landslides is too complicated to be done by trained non-technical experts. The LRRS asks questions related to landslide risk that can be used to calculate a landslide risk score to indicate the relative level of risk. The LRRS was created by reviewing published literature documenting other landslide rating systems and incorporating similar factors correlated with landslide risk. Then, forty sites were visited in the GCMA to inventory the factors at houses that are vulnerable to landslides in order to evaluate which factors were most useful for predicting the relative risk. The predicted risk scores were compared to ranked risk scores estimated by the author to ensure the results were valid. Statistical analysis identified which of these factors best-predicted landslide risk. These factors include slope angle, slope height, strength of slope material or material type, aperture of cracks, spatial impact, largest probable landslide volume, largest probable percentage of the living area that could be impacted from a landslide, and total person-hours a living area is occupied per day. Future work should focus on the transformation of the tool into a more user-friendly format for use by residents, the implementation process, and monitoring plan.
Subjects/Keywords: Geological engineering
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APA ·
Chicago ·
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CSE |
Export
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APA (6th Edition):
Faber, E. J. (2016). Development of a landslide risk rating system for small-scale landslides affecting settlements in Guatemala City. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10014960
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Faber, Ethan J. “Development of a landslide risk rating system for small-scale landslides affecting settlements in Guatemala City.” 2016. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=10014960.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Faber, Ethan J. “Development of a landslide risk rating system for small-scale landslides affecting settlements in Guatemala City.” 2016. Web. 22 Sep 2017.
Vancouver:
Faber EJ. Development of a landslide risk rating system for small-scale landslides affecting settlements in Guatemala City. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10014960.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Faber EJ. Development of a landslide risk rating system for small-scale landslides affecting settlements in Guatemala City. [Thesis]. Colorado School of Mines; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10014960
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
11.
Charlesworth, Alexander E.
A class of staggered grid algorithms and analysis for time-domain Maxwell systems.
Degree: 2016, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10010857
► We describe, implement, and analyze a class of staggered grid algorithms for efficient simulation and analysis of time-domain Maxwell systems in the case of…
(more)
▼ We describe, implement, and analyze a class of staggered grid algorithms for efficient simulation and analysis of time-domain Maxwell systems in the case of heterogeneous, conductive, and nondispersive, isotropic, linear media. We provide the derivation of a continuous mathematical model from the Maxwell equations in vacuum; however, the complexity of this system necessitates the use of computational methods for approximately solving for the physical unknowns. The finite difference approximation has been used for partial differential equations and the Maxwell Equations in particular for many years. We develop staggered grid based finite difference discrete operators as a class of approximations to continuous operators based on second order in time and various order approximations to the electric and magnetic field at staggered grid locations. A generalized parameterized operator which can be specified to any of this class of discrete operators is then applied to the Maxwell system and hence we develop discrete approximations through various choices of parameters in the approximation. We describe analysis of the resulting discrete system as an approximation to the continuous system. Using the comparison of dispersion analysis for the discrete and continuous systems, we derive a third difference approximation, in addition to the known (2, 2) and (2, 4) schemes. We conclude by providing the comparison of these three methods by simulating the Maxwell system for several choices of parameters in the system
Subjects/Keywords: Applied mathematics; Electromagnetics
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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APA (6th Edition):
Charlesworth, A. E. (2016). A class of staggered grid algorithms and analysis for time-domain Maxwell systems. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10010857
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Charlesworth, Alexander E. “A class of staggered grid algorithms and analysis for time-domain Maxwell systems.” 2016. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=10010857.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Charlesworth, Alexander E. “A class of staggered grid algorithms and analysis for time-domain Maxwell systems.” 2016. Web. 22 Sep 2017.
Vancouver:
Charlesworth AE. A class of staggered grid algorithms and analysis for time-domain Maxwell systems. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10010857.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Charlesworth AE. A class of staggered grid algorithms and analysis for time-domain Maxwell systems. [Thesis]. Colorado School of Mines; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10010857
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
12.
Geesaman, Patrick J.
Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA.
Degree: 2014, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1549082
► Upheaval Dome is a structurally deformed topographic depression located in Canyonlands National Park, southeast Utah. Multiple hypotheses for its origin have been proposed by…
(more)
▼ Upheaval Dome is a structurally deformed topographic depression located in Canyonlands National Park, southeast Utah. Multiple hypotheses for its origin have been proposed by various scientists over many years of research. The two remaining viable hypotheses are at opposite ends of the geologic spectrum, one proposing long-term deformation of the structure, while the other proposes a catastrophic meteorite impact. (1) The seminal paper by Jackson et al. (1998) suggests that Upheaval Dome was created due to the growth and subsequent pinch-off of a salt diapir sourced from the Pennsylvanian Paradox Formation. Their conclusions were based on various growth geometries in Jurassic age strata. (2) Perhaps the most influential paper proposing a meteorite impact at Upheaval Dome is by Buchner and Kenkmann (2008), titled "Upheaval Dome, Utah, USA: Impact origin confirmed". In this paper only two grains of shocked quartz are identified, out of 120 standard thin sections. Based on these thin sections comprising medium-coarse sand grains, only ~0.00043% of grains displayed evidence of high-pressure deformation. For shocked quartz to confirm a meteorite impact there must be abundant shocked grains (2-5%), and ~0.00043% cannot be considered abundant (French and Koeberl, 2010). Prior to this study there has been no attempt made to combine an in depth stratigraphic investigation of exposed, accessible formations with structural and lithologic observations in the Upheaval Dome area. Analysis of stratigraphic field data for Triassic to Jurassic-aged strata reveals: (1) stratigraphic thicknesses from measured sections range from 7 meters to 224 meters in the Kayenta Formation, and projected thicknesses in cross sections can exceed 400 meters; (2) distinct changes in facies distributions in relation to mapped structural features; (3) localized angular discordances, such as angular unconformities and onlaps, at the contact between formations or within individual formations. Analysis of structural features at Upheaval Dome reveals: (1) synclinal axes and associated depositional centers shift throughout the Jurassic; (2) stratigraphic thicknesses across normal faults from hanging to footwall blocks are unequal on the scale of meters to tens of meters; (3) thrust faults verge dominantly to the southeast regardless of the side of the dome they are located on; (4) blocks of Triassic Chinle Formation encased in the younger Jurassic Wingate Sandstone adjacent to dog tongues suggests the involvement of a brief period of allochthonous salt break out after the deposition of the Chinle. Petrographic analysis was inconclusive, as there were no shocked grains, nor any clasts of the Paradox Formation present in younger formations. The research presented in this study strongly indicates that long-term deformation occurred at Upheaval Dome during the Early Jurassic and possibly in older less well exposed units. Evidence supporting long-term deformation includes growth strata, changes in facies distributions, shifting…
Subjects/Keywords: Geology
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Geesaman, P. J. (2014). Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1549082
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Geesaman, Patrick J. “Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA.” 2014. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=1549082.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Geesaman, Patrick J. “Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA.” 2014. Web. 22 Sep 2017.
Vancouver:
Geesaman PJ. Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1549082.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Geesaman PJ. Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1549082
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
13.
Doe, Michael Frederick.
Reassessment of Paleo- and Mesoproterozoic basin sediments of Arizona| Implications for tectonic growth of southern Laurentia and global tectonic configurations.
Degree: 2014, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3622903
► Proterozoic crustal provinces that underlie much of the United States record prolonged southward growth of the North American craton (Laurentia) between ca. 1.8 and…
(more)
▼ Proterozoic crustal provinces that underlie much of the United States record prolonged southward growth of the North American craton (Laurentia) between ca. 1.8 and 1.0 Ga. Exposures throughout central Arizona's Tonto Basin represent multiple generations of sedimentary basins formed during Proterozoic accretion. Metasedimentary rocks sampled across Tonto Basin resulted have identified remnants of a previously undated but potentially widespread Mesoproterozoic basin called the Yankee Joe Basin. Sediments of Yankee Joe Basin are particularly interesting because they have depositional age's ca. 200 m.y. younger than previously thought and because they are rich in detrital zircons with ages between 1.6-1.48 Ga, a time period not widely represented in the igneous record of Laurentia. Metasedimentary rocks with similar age and provenance are found in northern New Mexico and in the lower parts of the Belt Supergroup in northern Idaho, Montana, and Canada. Zircon ages and Hf isotopic characteristics suggest the distinctive 1.6-1.48 Ga grains might have been derived from non-Laurentian sources, most likely one or more formerly adjacent cratons such as north Australia. Circa 1.48-1.43 Ga units in the Yankee Joe Basin rest disconformably on Paleoproterozoic quartzite, and all were deformed together during northwest-directed foreland-style thrusting. This event was previously interpreted to represent the ca. 1.66-1.60 Ga Mazatzal orogeny. However, new findings challenge this view and suggest a major deformation event occurred ca. 1.47-1.45 Ga, possibly representing the Picuris orogeny as recently described in northern New Mexico. Regional thrust faulting during the Mesoproterozoic might have unroofed and removed significant portions of the Yankee Joe section, potentially shedding detritus north from the thrust front into the upper parts of the Belt-Purcell basin. Detrital zircon ages and hafnium isotope compositions provide a critical test of sediment provenance and depositional age and were used to reassess sedimentary age and sources multiple Proterozoic unconformity-bound metasedimentary successions exposed across Arizona. These successions represent a series of ca. 1.75 to 1.3 Ga basins that span the Proterozoic accretionary provinces of southwestern Laurentia, representing key elements in the tectonic evolution of the continental margin. The ca. 1.75 Ga Vishnu Schist contains a bimodal detrital zircon age distribution with prominent Archean (2.5 Ga) and Early Paleoproterozoic (1.8 Ga) populations and minor juvenile 1.75 Ga input. The predominance of 3.3-1.8 Ga detrital zircon ages and initial epsilon Hf (ϵHf) values of +4 to -13 in both detrital grains of the Vishnu Schist and xenocrystic grains in plutons from cross-cutting plutons suggests the Vishnu Schist was derived primarily from recycling of the Mojave and other older basement provinces, possibly including one or more outboard cratons. In contrast, the ca. 1.74-1.72 Ga Jerome and ca. 1.72 Ga Alder successions of central Arizona, show a marked…
Subjects/Keywords: Geology; Plate Tectonics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Doe, M. F. (2014). Reassessment of Paleo- and Mesoproterozoic basin sediments of Arizona| Implications for tectonic growth of southern Laurentia and global tectonic configurations. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3622903
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Doe, Michael Frederick. “Reassessment of Paleo- and Mesoproterozoic basin sediments of Arizona| Implications for tectonic growth of southern Laurentia and global tectonic configurations.” 2014. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=3622903.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Doe, Michael Frederick. “Reassessment of Paleo- and Mesoproterozoic basin sediments of Arizona| Implications for tectonic growth of southern Laurentia and global tectonic configurations.” 2014. Web. 22 Sep 2017.
Vancouver:
Doe MF. Reassessment of Paleo- and Mesoproterozoic basin sediments of Arizona| Implications for tectonic growth of southern Laurentia and global tectonic configurations. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3622903.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Doe MF. Reassessment of Paleo- and Mesoproterozoic basin sediments of Arizona| Implications for tectonic growth of southern Laurentia and global tectonic configurations. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3622903
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
14.
Fisher, Wendy D.
Machine learning for the automatic detection of anomalous events.
Degree: 2017, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10258193
► In this dissertation, we describe our research contributions for a novel approach to the application of machine learning for the automatic detection of anomalous…
(more)
▼ In this dissertation, we describe our research contributions for a novel approach to the application of machine learning for the automatic detection of anomalous events. We work in two different domains to ensure a robust data-driven workflow that could be generalized for monitoring other systems. Specifically, in our first domain, we begin with the identification of internal erosion events in earth dams and levees (EDLs) using geophysical data collected from sensors located on the surface of the levee. As EDLs across the globe reach the end of their design lives, effectively monitoring their structural integrity is of critical importance. The second domain of interest is related to mobile telecommunications, where we investigate a system for automatically detecting non-commercial base station routers (BSRs) operating in protected frequency space. The presence of non-commercial BSRs can disrupt the connectivity of end users, cause service issues for the commercial providers, and introduce significant security concerns. We provide our motivation, experimentation, and results from investigating a generalized novel data-driven workflow using several machine learning techniques. In Chapter 2, we present results from our performance study that uses popular unsupervised clustering algorithms to gain insights to our real-world problems, and evaluate our results using internal and external validation techniques. Using EDL passive seismic data from an experimental laboratory earth embankment, results consistently show a clear separation of events from non-events in four of the five clustering algorithms applied. Chapter 3 uses a multivariate Gaussian machine learning model to identify anomalies in our experimental data sets. For the EDL work, we used experimental data from two different laboratory earth embankments. Additionally, we explore five wavelet transform methods for signal denoising. The best performance is achieved with the Haar wavelets. We achieve up to 97.3% overall accuracy and less than 1.4% false negatives in anomaly detection. In Chapter 4, we research using two-class and one-class support vector machines (SVMs) for an effective anomaly detection system. We again use the two different EDL data sets from experimental laboratory earth embankments (each having approximately 80% normal and 20% anomalies) to ensure our workflow is robust enough to work with multiple data sets and different types of anomalous events (e.g., cracks and piping). We apply Haar wavelet-denoising techniques and extract nine spectral features from decomposed segments of the time series data. The two-class SVM with 10-fold cross validation achieved over 94% overall accuracy and 96% F1-score. Our approach provides a means for automatically identifying anomalous events using various machine learning techniques. Detecting internal erosion events in aging EDLs, earlier than is currently possible, can allow more time to prevent or mitigate catastrophic failures. Results show that we can successfully…
Subjects/Keywords: Geophysics; Computer science
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Fisher, W. D. (2017). Machine learning for the automatic detection of anomalous events. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10258193
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fisher, Wendy D. “Machine learning for the automatic detection of anomalous events.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=10258193.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fisher, Wendy D. “Machine learning for the automatic detection of anomalous events.” 2017. Web. 22 Sep 2017.
Vancouver:
Fisher WD. Machine learning for the automatic detection of anomalous events. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10258193.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fisher WD. Machine learning for the automatic detection of anomalous events. [Thesis]. Colorado School of Mines; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10258193
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
15.
Enright, Christopher A.
Urban emergency medical response vs. mining emergency medical response : a comparative study.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170705
► Emergency medical response is one of the critical services provided to the citizens of the United States, and a certain standard of care exists for…
(more)
▼ Emergency medical response is one of the critical services provided to the citizens of the United States, and a certain standard of care exists for response in the urban environment today. This study seeks to evaluate and characterize whether this standard of care is met in both surface and underground mining in the United States. It will also provide recommendations on what can be changed to improve emergency medical care delivered to injured miners. Data from both the accident and injury database from the Mine Safety and Health Administration (MSHA), reports from the National Institute of Occupational Health and Safety (NIOSH), and publications and data on urban emergency medical care from various sources have been assessed to develop a comparison between the two operating environments. With the direct comparison of the data on care available and results, several critical shortcomings of the mining industry were identified, including a considerably lower standard of care and a pronounced travel time to definitive care. Considerable potential exists for the mining industry to improve care delivered, notably increasing training required for miners and mine emergency response professionals, collecting more comprehensive statistics and preparing for expedited transport to definitive care at an accredited trauma center.
Advisors/Committee Members: Brune, Jürgen F. (advisor), Smith, Collin D. (committee member), Miller, Hugh B. (committee member).
Subjects/Keywords: EMS; Mine rescue; Mining; Mine emergency; Emergency; Mine safety
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APA (6th Edition):
Enright, C. A. (2017). Urban emergency medical response vs. mining emergency medical response : a comparative study. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170705
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Enright, Christopher A. “Urban emergency medical response vs. mining emergency medical response : a comparative study.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170705.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Enright, Christopher A. “Urban emergency medical response vs. mining emergency medical response : a comparative study.” 2017. Web. 22 Sep 2017.
Vancouver:
Enright CA. Urban emergency medical response vs. mining emergency medical response : a comparative study. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170705.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Enright CA. Urban emergency medical response vs. mining emergency medical response : a comparative study. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170705
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
16.
Wilkinson, Taylor M.
Characterization of ferroelasticity in rare-earth orthophosphates by nanoindentation.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170984
► Superelasticity, or the rubber-like effect, describes the phenomenon of a material being able to ‘recover’ after an external strain, beyond the elastic limit, is removed.…
(more)
▼ Superelasticity, or the rubber-like effect, describes the phenomenon of a material being able to ‘recover’ after an external strain, beyond the elastic limit, is removed. This behavior has been exhibited by shape memory alloys, as well as the emerging materials field of shape memory ceramics, and may be caused by the material undergoing deformation mechanisms such as phase transformation or twinning/detwinning – also known as ferroelasticity. Superelastic materials are known to be attractive candidates for shape memory materials as well as applications with actuating, sensing, and damping needs. Rare-earth orthophosphates are a group of ceramics that are known to exhibit incredible flexibility with lanthanide element substitution as well as high resistance to chemical and thermal degradation. These materials have also been shown to undergo both of the deformation mechanisms associated with superelasticity. Nanoindentation is a promising technique for studying superelasticity due to its ability to run large-scale experimental matrices and the fact that the technique is highly sensitive and therefore able to pick up even the smallest amounts of recovery. Pioneer indentation testing of several rare-earth orthophosphates near the monazite/xenotime boundary has shown indentation recovery as a slope change that occurs during the unloading portion of test. Similar behavior has been attributed to phase transformations in silicon and twinning in germanium. This thesis conducts an in-depth study to determine the conditions under which these anomalous indentation features occur. Indentation recovery was not restricted to the phase transforming xenotimes, but could also occur in the non-phase transforming monazites as well; thus it was concluded that the presence of an elbow in the indentation data was not a unique identifier of phase transformation in rare-earth orthophosphates. Furthermore, it was shown that the elastic modulus of each of these compositions approached the value predicted by simulations and hardness was consistently above 5 GPa, provided that the samples were processed to nearly full density. Multiple indentations completed on a polycrystalline specimen of monazite GdPO4 revealed frequent anomalous unloading behavior with a large degree of recovery; therefore, an excised indentation was analyzed to determine the cause of recovery using TEM. The presence of a twin along the (100) orientation, along with a series of stacking faults contained within the deformation site, provide evidence that the mechanism of recovery in GdPO4 is twinning-based ferroelasticity. In addition to the large instances of superelasticity, cyclic loading of single-crystal monazite-structured GdPO4 was shown to exhibit recovery ratios similar to that of the shape memory alloy NiTi at 0.9, and exceeded the amount of achievable dissipated energy (250 MJ/m3 for GdPO4 vs. 10-20 MJ/m3 for NiTi). Furthermore, this study provides the first evidence that twinning-based ferroelasticity may be used to achieve superelasticity in ceramics, making…
Advisors/Committee Members: Packard, Corinne E. (advisor), Reimanis, Ivar E. (Ivar Edmund) (committee member), Diercks, David R. (committee member), Stebner, Aaron P. (committee member).
Subjects/Keywords: Mechanical behavior; Rare-earth orthophosphates; Ferroelasticity; Twinning; Nanoindentation
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APA ·
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APA (6th Edition):
Wilkinson, T. M. (2017). Characterization of ferroelasticity in rare-earth orthophosphates by nanoindentation. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170984
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wilkinson, Taylor M. “Characterization of ferroelasticity in rare-earth orthophosphates by nanoindentation.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170984.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wilkinson, Taylor M. “Characterization of ferroelasticity in rare-earth orthophosphates by nanoindentation.” 2017. Web. 22 Sep 2017.
Vancouver:
Wilkinson TM. Characterization of ferroelasticity in rare-earth orthophosphates by nanoindentation. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170984.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wilkinson TM. Characterization of ferroelasticity in rare-earth orthophosphates by nanoindentation. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170984
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
17.
Jordan, Brett Watson.
Three essays in resource economics and availability.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170986
► This dissertation investigates geologic, economic, social, and environmental barriers to the extraction of mineral resources. Minerals are critical inputs to society’s modern way of life,…
(more)
▼ This dissertation investigates geologic, economic, social, and environmental barriers to the extraction of mineral resources. Minerals are critical inputs to society’s modern way of life, but their short and long run supply often faces key constraints. Jointly considered, these barriers define the availability of minerals for society’s use. This study adds to the existing literature on mineral resource availability through quantitative evaluation of three issues - geologic abundance as a supply metric, metal joint production, and social license to operate. The issues of geologic abundance and joint production are examined for a hypothetical new end-use for a specific material using estimated industry cost curves and long run availability cures. Joint production is found to be the key driver of low cost supply, not the material’s abundance. The joint production relationship between minerals is then further examined using a flexible form dual revenue approach applied to a different set of materials. The results highlight the flexibility in a mine’s ability to spatially target production from its resource in response to changing prices. Finally, social and political barriers are examined by econometrically estimating the relationship between increased environmental attitudes and mine closures in the United States. This analysis reveals a causal effect of increasing local preferences for environmental quality on nearby mine closures. Enactment of state-level policy is identified as a potential mechanism for earlier-than-expected closure.
Advisors/Committee Members: Eggert, Roderick G. (advisor), Fell, Harrison (committee member), Maniloff, Peter (committee member), Anderson, Corby G. (committee member).
Subjects/Keywords: Joint production; Social license to operate; Mineral resource; By-product
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APA (6th Edition):
Jordan, B. W. (2017). Three essays in resource economics and availability. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170986
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jordan, Brett Watson. “Three essays in resource economics and availability.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170986.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jordan, Brett Watson. “Three essays in resource economics and availability.” 2017. Web. 22 Sep 2017.
Vancouver:
Jordan BW. Three essays in resource economics and availability. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170986.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jordan BW. Three essays in resource economics and availability. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170986
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
18.
Zang, Xiaoning.
Energy and information transfer via coherent exciton wave packets.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170987
► Electronic excitons are bound electron-hole states that are generated when light interacts with matter. Such excitations typically entangle with phonons and rapidly decohere; the resulting…
(more)
▼ Electronic excitons are bound electron-hole states that are generated when light interacts with matter. Such excitations typically entangle with phonons and rapidly decohere; the resulting electronic state dynamics become diffusive as a result. However, if the exciton-phonon coupling can be reduced, it may be possible to construct excitonic wave packets that offer a means of efficiently transmitting information and energy. This thesis is a combined theory/computation investigation to design condensed matter systems which support the requisite coherent transport. Under the idealizing assumption that exciton-phonon entanglement could be completely suppressed, the majority of this thesis focuses on the creation and manipulation of exciton wave packets in quasi-one-dimensional systems. While each site could be a silicon quantum dot, the actual implementation focused on organic molecular assemblies for the sake of computational simplicity, ease of experimental implementation, potential for coherent transport, and promise because of reduced structural uncertainty. A laser design was derived to create exciton wave packets with tunable shape and speed. Quantum interference was then exploited to manipulate these packets to block, pass, and even dissociate excitons based on their energies. These developments allow exciton packets to be considered within the arena of quantum information science. The concept of controllable excitonic wave packets was subsequently extended to consider molecular designs that allow photons with orbital angular momentum to be absorbed to create excitons with a quasi-angular momentum of their own. It was shown that a well-defined measure of topological charge is conserved in such light-matter interactions. Significantly, it was also discovered that such molecules allow photon angular momenta to be combined and later emitted. This amounts to a new way of up/down converting photonic angular momentum without relying on nonlinear optical materials. The associated excitations were dubbed \emph{twisted excitons}. Twisted exciton packets can be manipulated as they travel down molecular chains, and this has applications in quantum information science as well. In each setting considered, exciton dynamics were initially studied using a simple tight-binding formalism. This misses the actual many-body interactions and multiple energy levels associated real systems. To remedy this, I adapted an existing time-domain Density Functional Theory code and applied it to study the dynamics of exciton wave packets on quasi-one-dimensional systems. This required the use of high-performance computing and the construction of a number of key auxiliary codes. Establishing the requisite methodology constituted a substantial part of the entire thesis. Surprisingly, this effort uncovered a computational issue associated with Rabi oscillations that had been incorrectly characterized in the literature. My research elucidated the actual problem and a solution was found. This new methodology was an integral part of the overall…
Advisors/Committee Members: Lusk, Mark T. (advisor), Sellinger, Alan (committee member), Wood, David M. (committee member), Zimmerman, Jeramy D. (committee member).
Subjects/Keywords: Excitonic coupling; Quantum dot; Twisted exciton; Light-matter interaction; Coherent exciton; Reorganization
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APA ·
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Export
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Manager
APA (6th Edition):
Zang, X. (2017). Energy and information transfer via coherent exciton wave packets. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170987
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zang, Xiaoning. “Energy and information transfer via coherent exciton wave packets.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170987.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zang, Xiaoning. “Energy and information transfer via coherent exciton wave packets.” 2017. Web. 22 Sep 2017.
Vancouver:
Zang X. Energy and information transfer via coherent exciton wave packets. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170987.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zang X. Energy and information transfer via coherent exciton wave packets. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170987
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
19.
Nguyen, Vinh The.
Development of direct-methane proton exchange membrane fuel cells at low and elevated temperatures.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170992
► Proton exchange membrane fuel cells (PEMFCs) will be our next generation power source for transportation, stationary, and portable applications, due to their high power densities,…
(more)
▼ Proton exchange membrane fuel cells (PEMFCs) will be our next generation power source for transportation, stationary, and portable applications, due to their high power densities, high efficiencies, and low emissions. However, the current fuel source used in PEMFCs, hydrogen, has low compressibility and is not readily available as its production is relatively expensive. As a result, methane, a more compressible and primary constituent of natural gas, is more ideal to use as a fuel source in PEMFCs. Nevertheless, the utilization of methane for fuel cell applications with current technologies is neither efficient nor cost-effective. Methane is currently utilized electrochemically only in solid oxide fuel cells (SOFCs) that run at very high temperatures (700-1000°C) via a steam methane reforming (SMR) process. Energy loss during SMR at high temperature substantially lowers fuel cell efficiency. Therefore, operating fuel cells directly on methane at low temperatures is highly desired, and the key challenge to the direct-methane PEMFCs at low temperatures is the electrochemical activation of the methane molecule. Molecular catalysts featuring platinum complexes with ligands in the bidiazine family have shown the capability to selectively activate and oxidize the C–H bond of methane at low temperatures. These platinum organometallic complexes were covalently anchored to ordered mesoporous carbon (OMC) for electrochemical oxidation of methane in a proton exchange membrane fuel cell at 80°C. The maximum normalized power was five times higher than a modern commercial catalyst and two orders of magnitude greater than a Pt black catalyst. The observed differences in catalytic activities for oxidation of methane are linked to the chemistry of the tethered catalysts. This study helps to design future electrocatalytic systems for C–H bond activation that afford superior performance in direct-methane PEMFCs for potential commercial applications. To improve methane diffusion at the anode and avoid mass transport resistance during fuel cell polarization, several different protonic ionic liquids (PILs) were prepared. They replaced the standard perfluorosulfonic acid (PFSA) ionomer in direct-methane PEMFCs to test their performance at 80°C. N,N-diethylmethylammonium trifluoromethanesulfonate [DEMA][TfO], N,N-diethylmethylammonium nonafluorobutane-1-sulfonate [DEMA][NfO], and imidazolium trifluoromethanesulfonimide [Im][HTFSI] have shown high thermal stability and retained good proton conductivities under anhydrous conditions. Fuel cells with [Im][HTFSI] as the ionomer in the anode of a direct-methane PEMFC increased the current density five-fold and the power density three-fold higher than when the PFSA-type ionomer was used in the anode. The higher fuel cell performance resulted from the lower proton transfer and methane diffusion resistances found in the PILs. Direct-methane PEMFCs produced low and unstable current density partly due to the coalescence/agglomeration of the Pt nanoparticles during the fuel cell…
Advisors/Committee Members: Herring, Andrew M. (advisor), Trewyn, Brian (committee member), Koh, Carolyn A. (Carolyn Ann) (committee member), Maupin, C. Mark (committee member).
Subjects/Keywords: Fuel cell; Natural gas; Proton exchange membrane; Methane; Energy; Power
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APA (6th Edition):
Nguyen, V. T. (2017). Development of direct-methane proton exchange membrane fuel cells at low and elevated temperatures. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170992
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Nguyen, Vinh The. “Development of direct-methane proton exchange membrane fuel cells at low and elevated temperatures.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170992.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nguyen, Vinh The. “Development of direct-methane proton exchange membrane fuel cells at low and elevated temperatures.” 2017. Web. 22 Sep 2017.
Vancouver:
Nguyen VT. Development of direct-methane proton exchange membrane fuel cells at low and elevated temperatures. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170992.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nguyen VT. Development of direct-methane proton exchange membrane fuel cells at low and elevated temperatures. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170992
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
20.
Li, Songpo.
Novel intuitive human-robot interaction using 3D gaze.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170993
► Human-centered robotics has become a new trend in robotic research in which robots closely work around humans or even directly/indirectly make contact with humans. Human-centered…
(more)
▼ Human-centered robotics has become a new trend in robotic research in which robots closely work around humans or even directly/indirectly make contact with humans. Human-centered robotics not only requires the robot to successfully and safely accomplish the given task, but also requires it to establish a rapport with humans by considering human factors. Human-robot interaction (HRI) has been an essential component in human-centered robotics due to the fundamental information exchange between the human and the robot, which plays an essential role in the task success and rapport establishment. In this dissertation, human gaze, which indicates where a person is looking, is scientifically studied as an intuitive and effective HRI modality. The gaze modality is natural and effortless to utilize, and from gaze modality, rich information about a user's mental state can be revealed. Despite the promise of gaze modality, applying gaze as an interaction modality is significantly limited by the virtual gaze tracking technology available and low-level gaze interpretation. Three-dimensional (3D) gaze tracking in real environments, which measures the 3D Cartesian location of where a person is looking, is highly desirable for intuitive and effective HRI in human-centered robotics. Employing 3D gaze as an interaction modality not only indicates the manipulation target, but also reports the location of the target and suggests how to perform the manipulation on it. The goal of this dissertation is to achieve the novel 3D-gaze-based HRI modality, with which a user can intuitively express what tasks he/she wants the robot to do by directly looking at the object of interest in the real world. In working toward this goal, the investigation concentrates on 1) the technology to accurately sense where a person is looking in real environments and 2) the method to interpret the human gaze and convert it into an effective interaction modality. This new interaction modality is expected to benefit users who have impaired mobility in their daily living as well as able-bodied users who need an additional hand in general working scenarios.
Advisors/Committee Members: Zhang, Xiaoli (advisor), Zhang, Hao (committee member), Hoff, William A. (committee member), Steele, John P. H. (committee member).
Subjects/Keywords: Assistive robot; Human-robot interaction; 3D gaze; Intention awareness; Attention awareness
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Li, S. (2017). Novel intuitive human-robot interaction using 3D gaze. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170993
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Li, Songpo. “Novel intuitive human-robot interaction using 3D gaze.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170993.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Li, Songpo. “Novel intuitive human-robot interaction using 3D gaze.” 2017. Web. 22 Sep 2017.
Vancouver:
Li S. Novel intuitive human-robot interaction using 3D gaze. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170993.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Li S. Novel intuitive human-robot interaction using 3D gaze. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170993
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
21.
Kluherz, Kyle Thompson.
The development of ordered mesoporous carbon nanoparticles for lanthanide separations.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170994
► Ordered mesoporous carbons (OMCs) have shown great promise for a variety of applications, including catalysis, electrochemistry, selective sequestration, drug delivery, and separations chemistry. This versatility…
(more)
▼ Ordered mesoporous carbons (OMCs) have shown great promise for a variety of applications, including catalysis, electrochemistry, selective sequestration, drug delivery, and separations chemistry. This versatility is based on their high surface area, regular ordered pores, tunable pore size and structure, physical durability and low reactivity, diverse potential surface functionalization, and adaptable synthesis routes. Furthermore, their durability in an oxidizing environment, such as that produced by radioactive decay, and ability to protect internal functional groups make them particularly well-suited to radiochemistry applications. In this work, OMCs have been explored for the selective extraction of lanthanides from solution through the use of surface-attached tropolone and bis-2-ethylhexyl phosphoric acid functional groups. The ultimate goal of this research is to gain a fundamental understanding of the interaction between material properties and separations behavior to inform development of novel and improved lanthanide extraction methods.
Advisors/Committee Members: Trewyn, Brian (advisor), Braley, Jenifer C. (committee member), Vyas, Shubham (committee member).
Subjects/Keywords: Lanthanide; Ordered mesoporous carbons; Separations; Nanoparticles; Functional materials; Radiochemistry
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Export
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APA (6th Edition):
Kluherz, K. T. (2017). The development of ordered mesoporous carbon nanoparticles for lanthanide separations. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170994
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kluherz, Kyle Thompson. “The development of ordered mesoporous carbon nanoparticles for lanthanide separations.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170994.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kluherz, Kyle Thompson. “The development of ordered mesoporous carbon nanoparticles for lanthanide separations.” 2017. Web. 22 Sep 2017.
Vancouver:
Kluherz KT. The development of ordered mesoporous carbon nanoparticles for lanthanide separations. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170994.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kluherz KT. The development of ordered mesoporous carbon nanoparticles for lanthanide separations. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170994
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
22.
Yemam, Henok A.
Novel small molecules for detection of sensitive nuclear materials.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170995
► Plastic scintillation is a simple detection process for sensitive nuclear materials such as uranium and plutonium isotopes. The material consists of a polymer matrix, a…
(more)
▼ Plastic scintillation is a simple detection process for sensitive nuclear materials such as uranium and plutonium isotopes. The material consists of a polymer matrix, a fluorescent primary dopant and a wavelength shifter and is directly connected to a photomultiplier tube. The matrix interacts with the incident radiation and transfers the absorbed energy to the primary dopant that then transfers some of the energy to the wavelength shifter. The cascade of energy transfers determines the efficiency of detection that currently is not on par with other radiation detectors e.g. crystal scintillators or gas-filled proportional counters in terms of energy resolution and neutron sensitivity. However, plastic scintillators are inexpensive, mass producible in different shapes and forms, and safe for transportation and field deployment. The efficient detection of sensitive nuclear materials that emit gamma and fast neutrons via plastic scintillator would provide an affordable and safe alternative to the existing state-of-the-art radiation detectors. To achieve a comparable level of detection, the understanding of the fundamental radiation detection process in plastic scintillator needs to be investigated further and more thoroughly. In this thesis, two methods were explored to achieve enhanced radiation detection versus commercial products: 1. detection of mixed radiation fields (neutron and gamma) via over-doping of fluorescent aromatic small molecules and 2. detection of thermal neutrons via incorporation of boron containing aromatic small molecules. The over-doping method led us to explore several classes of fluorescent small molecules synthetically and computationally. These molecules were p-terphenyl (PTP), fluorene and 2,5-diphenyloxazole (PPO) derivatives. The solubility limit of para-alkylated and meta-alkylated PTP derivatives in polyvinyltoluene (PVT) were inversely correlated with the respective melting points of the derivatives. The para-alkylated PTP derivatives precipitated from the PVT matrix around 7 wt% despite showing promising radiation detection. On the other hand, meta-alkylated PTP had solubility limits up to 20 wt% in PVT with surprisingly poor mixed radiation discrimination. The reason for their poor performance was attributed due to the softening of the plastic matrix at higher dopants concentrations. This reason was confirmed by ground state geometry calculations that showed PTP derivatives as non-planar dopants prone to vibrationally dissipate triplet state energies. Experimentally, this was proved by the near identical discrimination of PPO and one of the meta-alkylated PTP mixed radiation discrimination in poly(methyl methacrylate). Several fluorene derivatives were synthesized via simple chemistry with good to excellent yields. Half of the derivatives were planar and the other half were non-planar. The derivatives all had different optical and physical properties that determined their radiation detection performance. In these derivatives, material impurity (< 0.2%) drastically impacted their…
Advisors/Committee Members: Sellinger, Alan (advisor), Greife, Uwe (committee member), Yang, Yuan (committee member), Trewyn, Brian (committee member).
Subjects/Keywords: Plastic scintillation; Pulse shape discrimination; Thermal neutron capture; p-terphenyl derivatives; Oxazole derivatives; Small fluorescent molecules
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APA (6th Edition):
Yemam, H. A. (2017). Novel small molecules for detection of sensitive nuclear materials. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170995
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yemam, Henok A. “Novel small molecules for detection of sensitive nuclear materials.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170995.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yemam, Henok A. “Novel small molecules for detection of sensitive nuclear materials.” 2017. Web. 22 Sep 2017.
Vancouver:
Yemam HA. Novel small molecules for detection of sensitive nuclear materials. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170995.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yemam HA. Novel small molecules for detection of sensitive nuclear materials. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170995
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
23.
Shutt, Deborah A.
Modeling, analysis, and simulation of complex disease dynamics for HIV, Ebola, and Zika virus.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170996
► The contributions made by mathematical approaches to biological problems has become widely recognized in recent decades. The focus of this thesis is to develop and…
(more)
▼ The contributions made by mathematical approaches to biological problems has become widely recognized in recent decades. The focus of this thesis is to develop and analyze novel mathematical models for various aspects of three infectious diseases: Human Immunodeficiency Virus (HIV), Ebola virus disease (EVD) and Zika virus. HIV is examined at the in-host level by two models capturing two stages of the disease process within the blood. The first HIV model considered here incorporates the effects of latent infection and mutation of the virus. This research is meant to provide applicable information when considering various vaccine developments and combination strategies to maintain viral suppression. The second HIV model in this dissertation examines early stage viral development and the contribution of the homeostatic proliferation of CD4+ T cells on the dynamics of the disease process; in particular the dependence of long term outcomes on the initial viral load and healthy T cell count. Both EVD and Zika are analyzed at the epidemiological level with compartmental model structures. A branching SEIR Ebola model is embedded into a stochastic process by means of a novel multinomial distribution derivation. This model is used to determine the most prominent forces of infection causing the 2014 Ebola outbreak in West Africa based on data as recorded by the World Health Organization. Finally, the spread of Zika within Central and South American countries is modeled by way of a modified (SEIR)/SEI vector compartmental structure to estimate basic reproductive numbers, total outbreak size, and reporting rates for Colombia, El Salvador and Suriname. This study highlights the need for research and data collection that will better constrain parameter ranges.
Advisors/Committee Members: Pankavich, Stephen (advisor), Porter, Aaron T. (advisor), Martin, P. A. (committee member), Diniz Behn, Cecilia (committee member), Maupin, C. Mark (committee member).
Subjects/Keywords: Epidemiology; Modeling; Zika; Infectious diseases; Ebola; Parameter estimation
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APA (6th Edition):
Shutt, D. A. (2017). Modeling, analysis, and simulation of complex disease dynamics for HIV, Ebola, and Zika virus. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170996
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shutt, Deborah A. “Modeling, analysis, and simulation of complex disease dynamics for HIV, Ebola, and Zika virus.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170996.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shutt, Deborah A. “Modeling, analysis, and simulation of complex disease dynamics for HIV, Ebola, and Zika virus.” 2017. Web. 22 Sep 2017.
Vancouver:
Shutt DA. Modeling, analysis, and simulation of complex disease dynamics for HIV, Ebola, and Zika virus. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170996.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shutt DA. Modeling, analysis, and simulation of complex disease dynamics for HIV, Ebola, and Zika virus. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170996
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
24.
Shugart, Nicolas.
Development of a safeguards process simulation for open and closed nuclear fuel cycles.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170997
► SafeGuards Analysis (SGA) is a computational toolbox able to simulate different safeguards scenarios across a number of different fuel cycles and at many different scales…
(more)
▼ SafeGuards Analysis (SGA) is a computational toolbox able to simulate different safeguards scenarios across a number of different fuel cycles and at many different scales within a Matlab Simulink framework. SGA functions by simulating Material Balance Areas (MBAs) under safeguards materials control and accountability and allows the user to define the uncertainty parameters of the associated flow and inventory measurements. The simulated safeguard system uses the uncertain measurement estimates to calculate mass-balance across the MBA. This mass balance is then evaluated by one or more of a number of different statistical tests to determine if a significant amount of material has been removed from the MBA. This thesis describes the development of SGA, and presents a number of example scenarios consisting of one or more MBAs. The goal of each of these scenarios is to determine the ability of SGA to calculate the Type I (false detect) or Type II (missed detection) error probability of the scenario. In each of these example scenarios, SGA generated reasonable results. To fully demonstrate SGA’s capabilities, the thesis also examines a more complicated scenario representative of a closed fuel cycle. This examination is paired with the operations research NUclear Measurement System Optimization (NUMSO) toolbox which calculates the best configuration of measurements based on a user-defined set of objectives. The two toolboxes allow a user to develop quickly develop a potentially optimal safeguards system with NUMSO, and then use SGA to examine the detailed behavior of that system. In every example considered in the thesis, SGA performs as designed.
Advisors/Committee Members: King, Jeffrey C. (advisor), Newman, Alexandra M. (committee member), Braley, Jenifer C. (committee member), Jensen, Mark (committee member).
Subjects/Keywords: Nuclear; Simulation; Safeguards; Modeling
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APA ·
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MLA ·
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CSE |
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APA (6th Edition):
Shugart, N. (2017). Development of a safeguards process simulation for open and closed nuclear fuel cycles. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170997
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shugart, Nicolas. “Development of a safeguards process simulation for open and closed nuclear fuel cycles.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170997.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shugart, Nicolas. “Development of a safeguards process simulation for open and closed nuclear fuel cycles.” 2017. Web. 22 Sep 2017.
Vancouver:
Shugart N. Development of a safeguards process simulation for open and closed nuclear fuel cycles. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170997.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shugart N. Development of a safeguards process simulation for open and closed nuclear fuel cycles. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170997
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
25.
Deng, Peng.
Quantitative approaches for assessing ground motion impact in performance based earthquake engineering.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170998
► Over the past several decades, Performance Based Earthquake Engineering (PBEE) has evolved to become a major focus in earthquake engineering research. One of the most…
(more)
▼ Over the past several decades, Performance Based Earthquake Engineering (PBEE) has evolved to become a major focus in earthquake engineering research. One of the most attractive features of this philosophy is the ability to account for response uncertainty in a more explicit manner. One of the cornerstones of modern PBEE is the ability to perform nonlinear time history analysis (NLTHA) on structural systems with the aid of fast computers. This advancement in tools made the use of incremental dynamic analysis (IDA) popular. Through IDA, curves describing the relationship between peak responses of structures and seismic intensity of earthquake ground motions can be obtained and can be used to derive uncertainty metrics of the seismic responses of interest. Many critical concepts in PBEE, such as fragility, response distribution, and seismic reliability, are linked heavily to IDA. As a result, the computation of most PBEE metrics must be done numerically (empirically) through NLTHA. The fundamental understanding of ground motion (GM) impact in PBEE is not clear. In order to better understand the role of GMs in PBEE, an innovative approach was proposed in this study to quantify GM uncertainty and its impact on idealized structural system responses. The research work started at the quantification of IDA curves as a function of ground motion parameters, structural parameters and seismic intensity. This was done successfully for the elastoplastic single-degree-of-freedom (SDOF) system acceleration and then expanded to bilinear SDOF system displacement, which has direct implications for damage control in PBEE. The proposed formulas quantitatively illustrate (1) the changing of response uncertainty with seismic intensity; (2) the interaction of ground motion parameters and structural parameters on uncertainty propagation; (3) the relative contribution of ground motion uncertainty and structural parameter uncertainty with different seismic intensity. Additionally, the identified ground motion parameters in the uncertainty quantification framework can present the ground motion characteristics and then can be used to validate the ground motion suite equivalency in the context of response uncertainty. The newly developed methodology challenges the existing simplified ways to calculate seismic uncertainty, such as the assumption of constant uncertainty contribution from GMs at different intensity levels. This was then tested through specially designed shake table tests that are focused on validating seismic uncertainty propagation. Through the probabilistic shake table tests, it was validated that the response uncertainty value is dependent on the seismic intensity, and the relative contribution of ground motion uncertainty and structural parameter uncertainty is closely correlated with seismic intensity. By using the experimental response data, square-root-sum-of-squares (SRSS) method used in many simplified uncertainty estimation procedures was verified to be not exact but conservative. Through collaboration with researchers…
Advisors/Committee Members: Pei, Shiling (advisor), Griffiths, D. V. (committee member), Crocker, Joseph P. (committee member), Navidi, William Cyrus (committee member).
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APA (6th Edition):
Deng, P. (2017). Quantitative approaches for assessing ground motion impact in performance based earthquake engineering. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170998
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Deng, Peng. “Quantitative approaches for assessing ground motion impact in performance based earthquake engineering.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170998.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Deng, Peng. “Quantitative approaches for assessing ground motion impact in performance based earthquake engineering.” 2017. Web. 22 Sep 2017.
Vancouver:
Deng P. Quantitative approaches for assessing ground motion impact in performance based earthquake engineering. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170998.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Deng P. Quantitative approaches for assessing ground motion impact in performance based earthquake engineering. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170998
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
26.
Musselman, Matthew Anthony.
In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1-x)PO4.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/170999
► Xenotime DyPO4 and GdxDy(1-x)PO4 (x = 0.4, 0.5, 0.6) (tetragonal I41/amd zircon structure) have been studied at ambient temperature under high pressures inside a diamond…
(more)
▼ Xenotime DyPO4 and GdxDy(1-x)PO4 (x = 0.4, 0.5, 0.6) (tetragonal I41/amd zircon structure) have been studied at ambient temperature under high pressures inside a diamond anvil cell with in situ Raman spectroscopy. The Raman active modes of the xenotime structure were observed at low pressures and the appearance of new Raman peaks at higher pressures indicate a phase transformation to a lower symmetry structure, likely monoclinic. The onset phase transformation pressure of DyPO4 was 15.3 GPa. The transformation pressures of the solid solutions (GdxDy(1-x)PO4) were 12.2 GPa (40/60, x=0.4), 10.1 GPa (50/50, x=0.5), and 11.9 GPa (60/40, x=0.6). The addition of Gd resulted in a decrease in transformation pressure from pure DyPO4. A line crossing as a result of Raman mode softening is observed at approximately 7-8 GPa for each material, preceding the phase transformation. DyPO4 underwent a reversible phase transformation and returned to the xenotime phase after decompression. The solid solutions yielded partially reversible phase transformations and retained peaks from the high-pressure phase while reforming xenotime peaks upon decompression.
Advisors/Committee Members: Packard, Corinne E. (advisor), Reimanis, Ivar (committee member), Brennecka, Geoff (committee member).
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APA ·
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APA (6th Edition):
Musselman, M. A. (2017). In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1-x)PO4. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170999
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Musselman, Matthew Anthony. “In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1-x)PO4.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/170999.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Musselman, Matthew Anthony. “In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1-x)PO4.” 2017. Web. 22 Sep 2017.
Vancouver:
Musselman MA. In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1-x)PO4. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/170999.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Musselman MA. In situ Raman spectroscopy of pressure-induced phase transformations in DyPO4 and GdxDy(1-x)PO4. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170999
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
27.
Hayes, Amelia May.
MULTI-SCALE CHARACTERIZATION OF POROSITY IN NATURALLY MINERALIZED FRACTURES.
Degree: 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/171003
► Naturally occurring fracture systems contain a separate porosity and permeability that can impact the way fluid flow through a rock by either providing flow obstruction…
(more)
▼ Naturally occurring fracture systems contain a separate porosity and permeability that can impact the way fluid flow through a rock by either providing flow obstruction or avenues of preferential flow. Current techniques for quantifying fracture porosity and permeability are limited to length scales of 10’s to 100’s of microns up to millimeter resolution, yet we know that pore networks in rock are fractal systems with porosity in the micron to manometer length scales. Because nano-scale pores play an important role in tight rock matrices, it is possible that pores at these length scales in natural fractures could contribute to flow either within the fracture itself or between the fracture and matrix. Here we use a combination of electron microscope techniques, cathodoluminescence imaging and small-angle neutron scattering to test the hypothesis that natural fractures that appear sealed at macroscale have connected micro- and nano-porosity. Fracture material from sub-vertical and horizontal mineralized fractures was analyzed. Estimates of micro-porosity in the analyzed vertical fractures by SEM image analysis range between 2.0 and 9.8%, but a lack of continuous grain boundary porosity suggests that the analyzed vertical fractures are not potential pathways for fluid flow. Estimated micro-porosity in horizontal fractures by SEM image analysis ranges between 0.9% and 8.3 % of fracture area and does contain connected grain boundary porosity. SANS-porosity in the horizontal fractures ranges between 0.2% – 1.7%. Preliminary FIB-SEM and TEM imaging shows that the geometry of nano-porosity is influenced by the crystal habit of the calcite fracture material. This thesis provides the first quantitative look at nano-porosity in macroscopically filled fractures and gives evidence that these pores are potentially connected and could contribute to fluid flow. Additional studies with this same approach can help build a knowledge base of nano- and micro-porosity presence in natural fractures and help elucidate their contribution to formation permeability.
Advisors/Committee Members: Navarre-Sitchler, Alexis (advisor), Benson, David (committee member), Gorman, Brian (committee member).
Subjects/Keywords: electron microscopy; fracture porosity; small-angle neutron scattering; fluid flow; cathodoluminescence; mineralized fracture
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Hayes, A. M. (2017). MULTI-SCALE CHARACTERIZATION OF POROSITY IN NATURALLY MINERALIZED FRACTURES. (Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/171003
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hayes, Amelia May. “MULTI-SCALE CHARACTERIZATION OF POROSITY IN NATURALLY MINERALIZED FRACTURES.” 2017. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://hdl.handle.net/11124/171003.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hayes, Amelia May. “MULTI-SCALE CHARACTERIZATION OF POROSITY IN NATURALLY MINERALIZED FRACTURES.” 2017. Web. 22 Sep 2017.
Vancouver:
Hayes AM. MULTI-SCALE CHARACTERIZATION OF POROSITY IN NATURALLY MINERALIZED FRACTURES. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2017 Sep 22].
Available from: http://hdl.handle.net/11124/171003.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hayes AM. MULTI-SCALE CHARACTERIZATION OF POROSITY IN NATURALLY MINERALIZED FRACTURES. [Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/171003
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
28.
Rock, Amanda J.
A semi-empirical assessment of plunge pool scour| Two-dimensional application of Annandale's erodibility index method on four dams in British Columbia, Canada.
Degree: 2015, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1583883
► Rock scour downstream of dam foundations and spillways has become a significant dam safety concern in recent years. As design flood estimates increase and…
(more)
▼ Rock scour downstream of dam foundations and spillways has become a significant dam safety concern in recent years. As design flood estimates increase and older infrastructure is expected to pass larger amounts of water, downstream river beds and plunge pools are subjected to progressively greater stream power from rapidly flowing water. A need exists to quantify the erosive capacity of the flowing water and the erodibility of earth materials to evaluate potential scour in these susceptible areas. Annandale's Erodibility Index Method, widely considered a state of the art scour prediction method, offers an approach to quantify scour depth by comparing the erosive capacity of flowing water and the ability of rock to resist it. This study assesses the accuracy of Annandale's Erodibility Index Method for estimating rock scour depth in plunge pools. The success by which the method may be implemented is dependent on the accuracy of methods to quantify the rate of energy dissipation of plunging jets (applied stream power) and the ability to estimate the capacity of rock to resist the power of the flowing water. The stream power of plunging jets is quantified by making use of published research, while the ability of rock to resist scour is computed using a geo-mechanical index, known as the Erodibility Index. The Erodibility Index that was used to estimate the scour resistance of the various stratigraphic layers downstream of four BC Hydro dam spillways located in British Columbia, Canada relies on in-situ rock parameters consisting of UCS strength values, RQD values, joint spacing, aperture, alteration, roughness, and orientation. The jet stream power was calculated using continuous daily discharge records and spillway geometries at each of the dams, and published research on stream power quantification. The spillway types included one long spillway chute with a free overfall and a number of flip bucket-type energy dissipaters. Comparison between the numerically generated scour profiles and a series of plunge pool surveys at each of the dams provided a means of determining accuracy. Scour depths and the distances between the end of the spillways and the points of maximum scour were matched. The study revealed that correlations between calculated and observed scour profiles improved with the quality of geologic information and with the certainty by which the stream power of jets and their decay could be quantified. The geologic information at two of the dams, Revelstoke and Seven Mile Dams, was incomplete and resulted in a generalized characterization of the scour resistance of the plunge pool rock. At these dams it was not possible to spatially characterize changes in scour resistance of the rock in the plunge pool. The geologic information at Peace Canyon and W.A.C. Bennett Dams was more informative and allowed quantification of the spatial distribution of plunge pool scour resistance in each case. The research further identified that jet theory associated with flip…
Subjects/Keywords: Geology; Hydrology; Engineering, Geological
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APA ·
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CSE |
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APA (6th Edition):
Rock, A. J. (2015). A semi-empirical assessment of plunge pool scour| Two-dimensional application of Annandale's erodibility index method on four dams in British Columbia, Canada. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1583883
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rock, Amanda J. “A semi-empirical assessment of plunge pool scour| Two-dimensional application of Annandale's erodibility index method on four dams in British Columbia, Canada.” 2015. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=1583883.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rock, Amanda J. “A semi-empirical assessment of plunge pool scour| Two-dimensional application of Annandale's erodibility index method on four dams in British Columbia, Canada.” 2015. Web. 22 Sep 2017.
Vancouver:
Rock AJ. A semi-empirical assessment of plunge pool scour| Two-dimensional application of Annandale's erodibility index method on four dams in British Columbia, Canada. [Internet] [Thesis]. Colorado School of Mines; 2015. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1583883.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rock AJ. A semi-empirical assessment of plunge pool scour| Two-dimensional application of Annandale's erodibility index method on four dams in British Columbia, Canada. [Thesis]. Colorado School of Mines; 2015. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1583883
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
29.
Munoz, Andrew.
Automatic simultaneous multiple-well ties.
Degree: 2014, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1553902
► Well logs, measured in depth, must be tied to seismograms, processed in time, using a time-depth function. Well ties are commonly computed using manual…
(more)
▼ Well logs, measured in depth, must be tied to seismograms, processed in time, using a time-depth function. Well ties are commonly computed using manual techniques, and are therefore prone to human error. I first introduce an automatic single-well tie method that uses smooth dynamic time warping to compute time shifts that align a synthetic seismogram with a seismic trace. These time shifts are constrained to be smoothly varying. I also show that these well ties, in my example, are insensitive to the complexity of my synthetic seismogram modeling. Tying multiple wells compounds errors in single well ties, and maintaining consistency among multiple single well ties is difficult. I introduce an automatic approach to tying multiple wells that improves consistency among well ties. I first model synthetic seismograms for each well. I then create a synthetic image by interpolating the synthetic seismograms between the wells and along seismic image structure. I use smooth dynamic image warping to align the synthetic image to the seismic image and compute updated time-depth functions for each well. I then interpolate the updated time-depth functions between the wells, and map the time-migrated seismic image to depth.
Subjects/Keywords: Geophysics
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APA (6th Edition):
Munoz, A. (2014). Automatic simultaneous multiple-well ties. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1553902
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Munoz, Andrew. “Automatic simultaneous multiple-well ties.” 2014. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=1553902.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Munoz, Andrew. “Automatic simultaneous multiple-well ties.” 2014. Web. 22 Sep 2017.
Vancouver:
Munoz A. Automatic simultaneous multiple-well ties. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1553902.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Munoz A. Automatic simultaneous multiple-well ties. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1553902
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
30.
Rubin, Marc J.
Efficient and automatic wireless geohazard monitoring.
Degree: 2014, Colorado School of Mines
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3638904
► In this dissertation, we present our research contributions geared towards creating an automated and efficient wireless sensor network (WSN) for geohazard monitoring. Specifically, this…
(more)
▼ In this dissertation, we present our research contributions geared towards creating an automated and efficient wireless sensor network (WSN) for geohazard monitoring. Specifically, this dissertation addresses three overall technical research problems inherent in implementing and deploying such a WSN, i.e., 1) automated event detection from geophysical data, 2) efficient wireless transmission, and 3) low-cost wireless hardware. In addition, after presenting algorithms, experimentation, and results from these three overall problems, we take a step back and discuss how, when, and why such scientific work matters in a geohazardous risk scenario. First, in Chapter 2, we discuss automated geohazard event detection within geophysical data. In particular, we present our pattern recognition workflow that can automatically detect snow avalanche events in seismic (geophone sensor) data. This workflow includes customized signal preprocessing for feature extraction, cluster-based stratified sub-sampling for majority class reduction, and experimentation with 12 different machine learning algorithms; results show that a decision stump classifier achieved 99.8% accuracy, 88.8% recall, and 13.2% precision in detecting avalanches within seismic data collected in the mountains above Davos, Switzerland, an improvement on previous work in the field. To address the second overall research problem (i.e., efficient wireless transmission), we present and evaluate our on-mote compressive sampling algorithm called Randomized Timing Vector (RTV) in Chapter 3 and compare our approach to four other on-mote, lossy compression algorithms in Chapter 4. Results from our work show that our RTV algorithm outperforms current on-mote compressive sampling algorithms and performs comparably to (and in many cases better than) the four state-of-the-art, on-mote lossy compression techniques. The main benefit of RTV is that it can <i>guarantee</i> a desired level of compression performance (and thus, radio usage and power consumption) without subjugating recovered signal quality. Another benefit of RTV is its simplicity and low computational overhead; by <i>sampling directly in compressed form,</i> RTV vastly decreases the amount of memory space and computation time required for on-mote compression. Third, in Chapter 5, we present and evaluate our custom, low-cost, Arduino-based wireless hardware (i.e., GeoMoteShield) developed for wireless seismic data acquisition. In particular, we first provide details regarding the motivation, design, and implementation of our custom GeoMoteShield and then compare our custom hardware against two much more expensive systems, i.e., a traditional <i> wired</i> seismograph and a "from-the-ground-up" wireless mote developed by SmartGeo colleagues. We validate our custom WSN of nine GeoMoteShields using controlled lab tests and then further evaluate the WSN's performance during two seismic field tests, i.e., a "walk-away" test and a seismic refraction survey. Results show that our…
Subjects/Keywords: Geophysics; Computer Science
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rubin, M. J. (2014). Efficient and automatic wireless geohazard monitoring. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3638904
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rubin, Marc J. “Efficient and automatic wireless geohazard monitoring.” 2014. Thesis, Colorado School of Mines. Accessed September 22, 2017.
http://pqdtopen.proquest.com/#viewpdf?dispub=3638904.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rubin, Marc J. “Efficient and automatic wireless geohazard monitoring.” 2014. Web. 22 Sep 2017.
Vancouver:
Rubin MJ. Efficient and automatic wireless geohazard monitoring. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2017 Sep 22].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3638904.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rubin MJ. Efficient and automatic wireless geohazard monitoring. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3638904
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations