publisher:"Colorado School of Mines"

Colorado School of Mines

1. Altman, Peggy Whitney. Biologically enhanced dense non-aqueous phase liquid dissolution in a three-dimensional sandstone fracture network.

Degree: 2015, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1605263

► Chlorinated solvents are some of the more difficult organic groundwater contaminants at remedial sites in fractured geologic media. The complex nature of flow and… (more)

Subjects/Keywords: Environmental engineering

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APA (6^th Edition):

Altman, P. W. (2015). Biologically enhanced dense non-aqueous phase liquid dissolution in a three-dimensional sandstone fracture network. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1605263

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Altman, Peggy Whitney. “Biologically enhanced dense non-aqueous phase liquid dissolution in a three-dimensional sandstone fracture network.” 2015. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=1605263.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Altman, Peggy Whitney. “Biologically enhanced dense non-aqueous phase liquid dissolution in a three-dimensional sandstone fracture network.” 2015. Web. 20 Apr 2021.

Vancouver:

Altman PW. Biologically enhanced dense non-aqueous phase liquid dissolution in a three-dimensional sandstone fracture network. [Internet] [Thesis]. Colorado School of Mines; 2015. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1605263.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Altman PW. Biologically enhanced dense non-aqueous phase liquid dissolution in a three-dimensional sandstone fracture network. [Thesis]. Colorado School of Mines; 2015. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1605263

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

2. Kamath, Nishant. Full-waveform inversion in 2D VTI media.

Degree: 2016, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10116167

► Full-waveform inversion (FWI) is a technique designed to produce a high-resolution model of the subsurface by using information contained in entire seismic waveforms. This… (more)

▼ Full-waveform inversion (FWI) is a technique designed to produce a high-resolution model of the subsurface by using information contained in entire seismic waveforms. This thesis presents a methodology for FWI in elastic VTI (transversely isotropic with a vertical axis of symmetry) media and discusses synthetic results for heterogeneous VTI models. First, I develop FWI for multicomponent data from a horizontally layered VTI model. The reflectivity method, which permits computation of only PP reflections or a combination of PP and PSV events, is employed to model the data. The Gauss-Newton technique is used to invert for the interval Thomsen parameters, while keeping the densities fixed at the correct values. Eigenvalue/eigenvector decompostion of the Hessian matrix helps analyze the sensitivity of the objective function to the model parameters. Whereas PP data alone are generally sufficient to constrain all four Thomsen parameters even for conventional spreads, including PS reflections provides better constraints, especially for the deeper part of the model. Next, I derive the gradients of the FWI objective function with respect to the stiffness coefficients of arbitrarily anisotropic media by employing the adjoint-state method. From these expressions, it is straightforward to compute the gradients for parameters of 2D heterogeneous VTI media. FWI is implemented in the time domain with the steepest-descent method used to iteratively update the model. The algorithm is tested on transmitted multicomponent data generated for Gaussian anomalies in Thomsen parameters embedded in homogeneous VTI media. To test the sensitivity of the objective function to different model parameters, I derive an an- alytic expression for the Fréchet kernel of FWI for arbitrary anisotropic symmetry by using the Born approximation and asymptotic Green’s functions. The amplitude of the kernel, which represents the radiation pattern of a secondary source (that source describes a perturbation in a model parameter), yields the angle-dependent energy scattered by the perturbation. Then the radiation patterns are obtained for anomalies in VTI parameters embedded in isotropic homogeneous media and employed to analyze the inversion results for the transmission FWI experiments. To understand some of the challenges posed by data recorded in surface surveys, I generate the multicomponent wavefield for a model based on a geologic section of the Valhall Field in the North Sea. A multiscale approach is adopted to perform FWI in the time domain. For the available offset range, diving-wave energy illuminates the top 1.5 km of the section, with the updates in the deeper regions due primarily to the reflections. FWI is tested for three model parameterizations and the results are explained in terms of the P- and SV-radiation patterns described above. These parameterizations lead to different trade-offs, and the choice of parameterization for a given data set depends on the recorded offset range, the…

Subjects/Keywords: Geophysics

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APA (6^th Edition):

Kamath, N. (2016). Full-waveform inversion in 2D VTI media. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10116167

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kamath, Nishant. “Full-waveform inversion in 2D VTI media.” 2016. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10116167.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kamath, Nishant. “Full-waveform inversion in 2D VTI media.” 2016. Web. 20 Apr 2021.

Vancouver:

Kamath N. Full-waveform inversion in 2D VTI media. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10116167.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kamath N. Full-waveform inversion in 2D VTI media. [Thesis]. Colorado School of Mines; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10116167

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

3. Wallen, Benjamin M. Heat and mass transfer through disturbed soil| Multiscale experimental and modeling investigation.

Degree: 2016, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10125471

► Landmines are one of the most prolific, human-made environmental hazards impacting the world. Although there are numerous technologies used to detect buried landmines, none… (more)

▼ Landmines are one of the most prolific, human-made environmental hazards impacting the world. Although there are numerous technologies used to detect buried landmines, none enable a perfect find rate, in part, due to the heterogeneous nature of the environment in which they are buried. Variations in environmental conditions such as soil moisture and climate (e.g., temperature, diurnal fluctuations) impact detection performance. Improved understanding of the environmental conditions associated with minefield emplacement is needed to enable improvement in the algorithms used by detection technologies (e.g., infrared, ground penetrating radar), thus increasing their performance and probability of detection rates. However, there is a lack of understanding of the effect of the mine placement on the heat and mass transfer dynamics in the vicinity of the mine. More specifically, very little is known about how soil disturbance, a process that changes the soil thermal and hydraulic properties of the soil surrounding the mine, due to the placement and burial of the mine effects the soil moisture and temperature conditions in the vicinity of the mine. This is important because understanding these impacts enables increased ability to compare progressively complex models to measured aspects of interest specific to landmine emplacement conditions. The purpose of this research is to better understand the effect of soil disturbance (i.e., loosening the soil) and mixing (i.e., combining different soil types) on heat and mass transfer behavior in the vicinity of buried landmines. The aim is that this knowledge can help future research efforts to improve algorithms associated with various detection technologies. This research integrates a field experiment and numerous laboratory experiments with analytical modeling. In the first task, the thermal conductivity of mixed sands are evaluated at the small scale, providing critical knowledge of the unique behavior. Results indicate that for the test sands studied, knowledge of soil density enables identification of both saturated and dry thermal conductivity which enhances modeling of the thermal conductivity-saturation relationships. Experimental data were used to test thermal conductivity-saturation models. The analytical models varied in their ability to capture the thermal behavior, demonstrating the need for a physically based thermal conductivity-saturation model. The second task compares several approaches used to determine evaporation with several laboratory evaporation and evapotranspiration experiments in an effort to determine an appropriate method that can be applied to studies of landmine detection, specifically, disturbed soil conditions. Results demonstrate that the methods vary in their ability to capture atmospheric versus diffusion dominated evaporative stages for the test soils and boundary conditions studied. Although no one method is applicable for all boundary and initial conditions, the sensible heat balance and heat pulse method enabled the highest level of…

Subjects/Keywords: Environmental engineering

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APA (6^th Edition):

Wallen, B. M. (2016). Heat and mass transfer through disturbed soil| Multiscale experimental and modeling investigation. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10125471

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wallen, Benjamin M. “Heat and mass transfer through disturbed soil| Multiscale experimental and modeling investigation.” 2016. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10125471.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wallen, Benjamin M. “Heat and mass transfer through disturbed soil| Multiscale experimental and modeling investigation.” 2016. Web. 20 Apr 2021.

Vancouver:

Wallen BM. Heat and mass transfer through disturbed soil| Multiscale experimental and modeling investigation. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10125471.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wallen BM. Heat and mass transfer through disturbed soil| Multiscale experimental and modeling investigation. [Thesis]. Colorado School of Mines; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10125471

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

4. Singh, Satyan. An inverse scattering approach to imaging using Marchenko equations in the presence of a free surface.

Degree: 2016, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10125227

► The Green's function is the impulse response of a system and is used to infer the properties of the system from surface measurements. In… (more)

▼ The Green's function is the impulse response of a system and is used to infer the properties of the system from surface measurements. In exploration seismology, imaging algorithms use estimates of the Green's functions along with surface measurements to image the subsurface, i.e. locate the Earth's interfaces and its properties, so as to identify valuable energy resources. These conventional imaging algorithms only account for singly reflected waves (primaries) in the subsurface and hence, in the subsurface image, produce false interfaces in the presence of multiply reflected waves (internal and free-surface multiples). Recent work has shown that we can retrieve the Green's function that accounts for primaries and internal multiples. Imaging with these Green's functions reduces the artifacts caused by internal multiples compared to conventional imaging algorithms. These Green's functions require the free-surface multiples to be removed from the surface measurements before retrieval and imaging. I modify the retrieval of the Green's function to account for free-surface reflections and therefore no longer require the free-surface multiples to be removed from the surface measurements. Thus the Green's function, in the method I propose, includes not only primaries and internal multiples but also free-surface multiples. These Green's functions are constructed from an arbitrary point in the subsurface (no physical receiver is required at this location) to the surface. The method I use to retrieve the Green's function does not specify the approach to image the subsurface. In this thesis I also analyze different imaging strategies using the retrieved Green's functions. Imaging with these Green's functions reduces the artifacts caused by multiply reflected waves compared to standard imaging algorithms. Significantly, the Green's function that I retrieve and use for imaging require the same inputs as conventional imaging algorithms: the surface measurements and a smooth version of the subsurface velocity. I also extend the construction of the Green's function from the subsurface to the surface to any two arbitrary points in the subsurface (no physical source or physical receiver is required at either of these locations). This Green's function is called the virtual Green's function and includes all the primaries, internal and free-surface multiples. The virtual Green's function retrieval requires the same inputs as the previously mentioned Green's functions.

Subjects/Keywords: Geophysics

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APA (6^th Edition):

Singh, S. (2016). An inverse scattering approach to imaging using Marchenko equations in the presence of a free surface. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10125227

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Singh, Satyan. “An inverse scattering approach to imaging using Marchenko equations in the presence of a free surface.” 2016. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10125227.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Singh, Satyan. “An inverse scattering approach to imaging using Marchenko equations in the presence of a free surface.” 2016. Web. 20 Apr 2021.

Vancouver:

Singh S. An inverse scattering approach to imaging using Marchenko equations in the presence of a free surface. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10125227.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Singh S. An inverse scattering approach to imaging using Marchenko equations in the presence of a free surface. [Thesis]. Colorado School of Mines; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10125227

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

5. 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)

Subjects/Keywords: Computer Science

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APA (6^th 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 (16^th Edition):

Card, Christopher Tyler. “Qualitative image based localization in a large building.” 2015. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Card, Christopher Tyler. “Qualitative image based localization in a large building.” 2015. Web. 20 Apr 2021.

Vancouver:

Card CT. Qualitative image based localization in a large building. [Internet] [Thesis]. Colorado School of Mines; 2015. [cited 2021 Apr 20]. 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

6. 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)

Subjects/Keywords: Geophysics; Geophysical engineering; Electromagnetics

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APA (6^th 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 (16^th Edition):

Kohnke, Colton J. “Electromagnetic effects of steel-cased wells.” 2017. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Kohnke, Colton J. “Electromagnetic effects of steel-cased wells.” 2017. Web. 20 Apr 2021.

Vancouver:

Kohnke CJ. Electromagnetic effects of steel-cased wells. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2021 Apr 20]. 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

7. 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)

Subjects/Keywords: Mechanical engineering; Physics

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APA (6^th 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 (16^th Edition):

Lozano, Eduardo. “Design and analysis of a personnel blast shield for different explosives applications.” 2016. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Lozano, Eduardo. “Design and analysis of a personnel blast shield for different explosives applications.” 2016. Web. 20 Apr 2021.

Vancouver:

Lozano E. Design and analysis of a personnel blast shield for different explosives applications. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2021 Apr 20]. 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

8. 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 (6^th 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 (16^th 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 April 20, 2021. 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 (7^th 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. 20 Apr 2021.

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 2021 Apr 20]. 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

9. 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)

Subjects/Keywords: Engineering, Mining; Engineering, Materials Science

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APA (6^th 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 (16^th 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 April 20, 2021. 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 (7^th Edition):

Hurley, Christoph. “Development of ammonium nitrate based explosives to optimize explosive properties and explosive welding parameters used during explosion cladding.” 2013. Web. 20 Apr 2021.

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 2021 Apr 20]. 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

10. 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 et al. 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 et al. 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 a ∼ 8.0 nm and c ∼ 5.0 nm (space group P6₃/mcm). The Ti₄Pt₃ 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 a ∼ 7.96 nm and c ∼ 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 (6^th 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 (16^th 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 April 20, 2021. 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 (7^th Edition):

Tello Araya, Karem E. “Phase transformations and equilibria of titanium platinum alloys in the composition range 30-50 atomic percent platinum.” 2012. Web. 20 Apr 2021.

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 2021 Apr 20]. 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

11. 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 · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Worrall, Dan M., Jr. “Modeling gas flows in longwall coal mines using computational fluid dynamics.” 2012. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Worrall, Dan M., Jr. “Modeling gas flows in longwall coal mines using computational fluid dynamics.” 2012. Web. 20 Apr 2021.

Vancouver:

Worrall, Dan M. J. Modeling gas flows in longwall coal mines using computational fluid dynamics. [Internet] [Thesis]. Colorado School of Mines; 2012. [cited 2021 Apr 20]. 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

12. 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 (6^th 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 (16^th Edition):

Alkuwairan, Maryam Y. “Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait.” 2013. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Alkuwairan, Maryam Y. “Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait.” 2013. Web. 20 Apr 2021.

Vancouver:

Alkuwairan MY. Polygenetic dolomite in subtidal sediments of northern Kuwait Bay, Kuwait. [Internet] [Thesis]. Colorado School of Mines; 2013. [cited 2021 Apr 20]. 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

13. 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)

Subjects/Keywords: Hydrology; Engineering, Geological; Engineering, Geophysical

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APA (6^th 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 (16^th Edition):

Ikard, Scott. “Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams.” 2014. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Ikard, Scott. “Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams.” 2014. Web. 20 Apr 2021.

Vancouver:

Ikard S. Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2021 Apr 20]. 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

14. 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 · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 April 20, 2021. 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 (7^th Edition):

Faber, Ethan J. “Development of a landslide risk rating system for small-scale landslides affecting settlements in Guatemala City.” 2016. Web. 20 Apr 2021.

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 2021 Apr 20]. 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

15. 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)

Subjects/Keywords: Applied mathematics; Electromagnetics

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APA (6^th 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 (16^th Edition):

Charlesworth, Alexander E. “A class of staggered grid algorithms and analysis for time-domain Maxwell systems.” 2016. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Charlesworth, Alexander E. “A class of staggered grid algorithms and analysis for time-domain Maxwell systems.” 2016. Web. 20 Apr 2021.

Vancouver:

Charlesworth AE. A class of staggered grid algorithms and analysis for time-domain Maxwell systems. [Internet] [Thesis]. Colorado School of Mines; 2016. [cited 2021 Apr 20]. 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

16. McNichols, Brett William. Synthesis and Application of Styryl Phosphonic and Cinnamic Acid Derivatives.

Degree: 2017, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10624231

► Styryl phosphonic and cinnamic acid derivatives have been gaining attention as key candidates to modulate specific electrode properties in organic electronic devices such as… (more)

▼ Styryl phosphonic and cinnamic acid derivatives have been gaining attention as key candidates to modulate specific electrode properties in organic electronic devices such as work function, surface energies, wettability, and electron charge transfer kinetics that lead to increased efficiency, operational range, and device lifetimes. Very few of these acids are commercially available. The driving factor behind this research is to explore simple, high yield, and inexpensive synthetic routes towards synthesis of these acids. Herein, the novel synthesis of vinyl phosphonic acids (VPAs) and their subsequent influence on interface properties compared to their phenyl phosphonic acids (PPAs) and benzyl phosphonic acids (BPAs) analogues are explored. This includes an in depth comparison of varying polar VPA, BPA, and PPA “families” attachment on conductive oxides as they allow for careful work function tuning of band edge energy and chemical properties on these surfaces. By leveraging similar techniques of VPA synthesis we can produce analogous cinnamic acids in which these same surface control concepts are applied on the surface of lead sulfide (PbS) colloidal semiconductor nano-crystals, or quantum dots (QDs). In order to do this, first a development of a simple solution-phase ligand exchange was necessary, from which we selectively replace native solubilizing ligands with these fictionalized cinnamic acids. This application achieved remarkable control allowing the band edge position to be tuned over an unprecedented 2.0 eV. This cinnamic acid synthetic chemistry can then be extended to functionalize multi acrylate containing molecules creating organic linkers to be integrated into Metal Organic Frameworks (MOFs). MOFs have increasingly gained attention for many high impact applications including but not limited to catalysis, gas storage and release, sensors, energy harvesting, conductivity, and filtration. A great amount of research is presently being conducted in developing new MOFs from the same handful of commercially available linkers. We introduce synthetic techniques for 18 isoreticular series of linkers that can be formulated with similar, if not identical, conditions giving way to the formation of previously unknown frameworks. This technique led us to incorporate a number of these linkers into Ni-MOFs and investigate catalytic activity for conversion of oleic acid to liquid hydrocarbons.

Subjects/Keywords: Organic chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

McNichols, B. W. (2017). Synthesis and Application of Styryl Phosphonic and Cinnamic Acid Derivatives. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10624231

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

McNichols, Brett William. “Synthesis and Application of Styryl Phosphonic and Cinnamic Acid Derivatives.” 2017. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10624231.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

McNichols, Brett William. “Synthesis and Application of Styryl Phosphonic and Cinnamic Acid Derivatives.” 2017. Web. 20 Apr 2021.

Vancouver:

McNichols BW. Synthesis and Application of Styryl Phosphonic and Cinnamic Acid Derivatives. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10624231.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

McNichols BW. Synthesis and Application of Styryl Phosphonic and Cinnamic Acid Derivatives. [Thesis]. Colorado School of Mines; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10624231

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

17. Poeck, Eric C. Analyzing the potential for unstable mine failures with the calculation of released energy in numerical models.

Degree: 2017, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10194982

► Unstable failure in underground mining occurs when a volume of material is loaded beyond its strength and displaces suddenly. It is recognized on various… (more)

Subjects/Keywords: Geotechnology; Geological engineering; Mining engineering

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APA (6^th Edition):

Poeck, E. C. (2017). Analyzing the potential for unstable mine failures with the calculation of released energy in numerical models. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10194982

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Poeck, Eric C. “Analyzing the potential for unstable mine failures with the calculation of released energy in numerical models.” 2017. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10194982.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Poeck, Eric C. “Analyzing the potential for unstable mine failures with the calculation of released energy in numerical models.” 2017. Web. 20 Apr 2021.

Vancouver:

Poeck EC. Analyzing the potential for unstable mine failures with the calculation of released energy in numerical models. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10194982.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Poeck EC. Analyzing the potential for unstable mine failures with the calculation of released energy in numerical models. [Thesis]. Colorado School of Mines; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10194982

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

18. Alfataierge, Ahmed. 3D Modeling and Characterization of Hydraulic Fracture Efficiency Integrated with 4D/9C Time-Lapse Seismic Interpretations in the Niobrara Formation, Wattenberg Field, Denver Basin.

Degree: 2018, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10634132

► Hydrocarbon recovery rates within the Niobrara Shale are estimated as low as 2–8%. These recovery rates are controlled by the ability to effectively hydraulic… (more)

▼ Hydrocarbon recovery rates within the Niobrara Shale are estimated as low as 2–8%. These recovery rates are controlled by the ability to effectively hydraulic fracture stimulate the reservoir using multistage horizontal wells. Subsequent to any mechanical issues that affect production from lateral wells, the variability in production performance and reserve recovery along multistage lateral shale wells is controlled by the reservoir heterogeneity and its consequent effect on hydraulic fracture stimulation efficiency. Using identical stimulation designs on a number of wells that are as close as 600ft apart can yield variable production and recovery rates due to inefficiencies in hydraulic fracture stimulation that result from the variability in elastic rock properties and in-situ stress conditions. As a means for examining the effect of the geological heterogeneity on hydraulic fracturing and production within the Niobrara Formation, a 3D geomechanical model is derived using geostatistical methods and volumetric calculations as an input to hydraulic fracture stimulation. The 3D geomechanical model incorporates the faults, lithological facies changes and lateral variation in reservoir properties and elastic rock properties that best represent the static reservoir conditions pre-hydraulic fracturing. Using a 3D numerical reservoir simulator, a hydraulic fracture predictive model is generated and calibrated to field diagnostic measurements (DFIT) and observations (microseismic and 4D/9C multicomponent time-lapse seismic). By incorporating the geological heterogeneity into the 3D hydraulic fracture simulation, a more representative response is generated that demonstrate the variability in hydraulic fracturing efficiency along the lateral wells that will inevitability influence production performance. Based on the 3D hydraulic fracture simulation results, integrated with microseismic observations and 4D/9C time-lapse seismic analysis (post-hydraulic fracturing & post production), the variability in production performance within the Niobrara Shale wells is shown to significantly be affected by the lateral variability in reservoir quality, well and stage positioning relative to the target interval, and the relative completion efficiency. The variation in reservoir properties, faults, rock strength parameters, and in-situ stress conditions are shown to influence and control the hydraulic fracturing geometry and stimulation efficiency resulting in complex and isolated induced fracture geometries to form within the reservoir. This consequently impacts the effective drainage areas, production performance and recovery rates from inefficiently stimulated horizontal wells. The 3D simulation results coupled with the 4D seismic interpretations illustrate that there is still room for improvement to be made in optimizing well spacing and hydraulic fracturing efficiency within the Niobrara Formation. Integrated analysis show that the Niobrara reservoir is not uniformly stimulated. The vertical…

Subjects/Keywords: Geophysical engineering; Engineering; Petroleum engineering

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APA (6^th Edition):

Alfataierge, A. (2018). 3D Modeling and Characterization of Hydraulic Fracture Efficiency Integrated with 4D/9C Time-Lapse Seismic Interpretations in the Niobrara Formation, Wattenberg Field, Denver Basin. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10634132

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alfataierge, Ahmed. “3D Modeling and Characterization of Hydraulic Fracture Efficiency Integrated with 4D/9C Time-Lapse Seismic Interpretations in the Niobrara Formation, Wattenberg Field, Denver Basin.” 2018. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10634132.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alfataierge, Ahmed. “3D Modeling and Characterization of Hydraulic Fracture Efficiency Integrated with 4D/9C Time-Lapse Seismic Interpretations in the Niobrara Formation, Wattenberg Field, Denver Basin.” 2018. Web. 20 Apr 2021.

Vancouver:

Alfataierge A. 3D Modeling and Characterization of Hydraulic Fracture Efficiency Integrated with 4D/9C Time-Lapse Seismic Interpretations in the Niobrara Formation, Wattenberg Field, Denver Basin. [Internet] [Thesis]. Colorado School of Mines; 2018. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10634132.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alfataierge A. 3D Modeling and Characterization of Hydraulic Fracture Efficiency Integrated with 4D/9C Time-Lapse Seismic Interpretations in the Niobrara Formation, Wattenberg Field, Denver Basin. [Thesis]. Colorado School of Mines; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10634132

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

19. 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 (6^th 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 (16^th 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 April 20, 2021. 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 (7^th Edition):

Geesaman, Patrick J. “Structural observations and stratigraphic variability in Jurassic strata, Upheaval Dome, Canyonlands National Park, Utah, USA.” 2014. Web. 20 Apr 2021.

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 2021 Apr 20]. 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

20. 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 (6^th 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 (16^th 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 April 20, 2021. 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 (7^th 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. 20 Apr 2021.

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 2021 Apr 20]. 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

21. 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 · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Fisher, Wendy D. “Machine learning for the automatic detection of anomalous events.” 2017. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Fisher, Wendy D. “Machine learning for the automatic detection of anomalous events.” 2017. Web. 20 Apr 2021.

Vancouver:

Fisher WD. Machine learning for the automatic detection of anomalous events. [Internet] [Thesis]. Colorado School of Mines; 2017. [cited 2021 Apr 20]. 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

22. Schindler, Mandy. On Pore-Scale Imaging and Elasticity of Unconsolidated Sediments.

Degree: 2018, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10788570

► Understanding the elastic properties of unconsolidated granular media is crucial for interpreting seismic and sonic log data in soils and unconsolidated petroleum reservoirs. Rock… (more)

▼ Understanding the elastic properties of unconsolidated granular media is crucial for interpreting seismic and sonic log data in soils and unconsolidated petroleum reservoirs. Rock and soil deformations are often estimated indirectly using rock physics models that relate changes in elastic properties to pore compliance. The complex microstructure of geological materials in represented by simple geometries in most rock physics models. One such model, the Hertz-Mindlin model, uses a pack of identical spheres to calculate elastic properties of unconsolidated sediments. The input parameters required for this model, porosity, grain radius, coordination number (number of contact points per grain) and grain to grain contact radius, are often unknown parameters and adjusted to fit the data. Direct observations of deformation can show the limitations in applicability of rock physics models. This requires 3D images obtained under in-situ pressure and temperature conditions. I imaged changes in dry, unconsolidated quartz sand with micro X-ray computed tomography (microCT) together with ultrasonic P-wave velocities at pressure from atmospheric pressure (0.08 MPa) to 27.6 MPa. In addition to an overall compaction of the sediment leading to a 30% reduction in porosity; the microCT images show a 60% reduction in grain size due to grain crushing, a 26% increase in coordination number, and 50% to 100% increase in contact radius. I used the image-derived porosity, grain radius, coordination number and contact radius as input data for the Hertz-Mindlin contact-radius model to compute P-wave velocities as functions of pressure. The microCT images show that numerous assumptions of the Hertz-Mindlin model are violated in sands and consequently, the model drastically overpredicts velocities. Although the velocity mismatch can be eliminated for undamaged sediments by assigning a reduced shear modulus to the contact zones, this adjusted model still overpredicts velocities of the sediment once grain crushing occurs. Thus, the Hertzian contact model should be applied with caution to angular, unconsolidated sediments. Understanding gas hydrate morphology and the relationship between hydrate saturation and elastic properties is crucial to characterize natural occurring hydrate resources and assess their potential for production. Gas hydrates in unconsolidated sediment are often represented by effective medium models of the sediment frame and hydrate inclusions in the pore space with different morphologies which allow us to estimate gas hydrate saturation from sonic log or seismic velocities. Most effective medium models assume microstructural parameters to predict acoustic velocities. Without the constraints of direct observation, for example, pressure- and temperature-dependent variations of the sediment frame or packing rearrangements during hydrate formation, such predictions lead to discrepancies in hydrate saturation calculated from velocities. My results verify hydrate pore-scale distributions by…

Subjects/Keywords: Geophysics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Schindler, M. (2018). On Pore-Scale Imaging and Elasticity of Unconsolidated Sediments. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10788570

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schindler, Mandy. “On Pore-Scale Imaging and Elasticity of Unconsolidated Sediments.” 2018. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10788570.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schindler, Mandy. “On Pore-Scale Imaging and Elasticity of Unconsolidated Sediments.” 2018. Web. 20 Apr 2021.

Vancouver:

Schindler M. On Pore-Scale Imaging and Elasticity of Unconsolidated Sediments. [Internet] [Thesis]. Colorado School of Mines; 2018. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10788570.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schindler M. On Pore-Scale Imaging and Elasticity of Unconsolidated Sediments. [Thesis]. Colorado School of Mines; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10788570

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

23. LaPorte, David. Evaluating Landslide Risk Management in Guatemala City through a Study of Risk Perception and Behavior Changes.

Degree: 2018, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10816996

► In October of 2015, a devastating landslide killed an estimated 350 people in the community of El Cambray II, located in a Guatemala City… (more)

Subjects/Keywords: Geological engineering; Engineering

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APA (6^th Edition):

LaPorte, D. (2018). Evaluating Landslide Risk Management in Guatemala City through a Study of Risk Perception and Behavior Changes. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10816996

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

LaPorte, David. “Evaluating Landslide Risk Management in Guatemala City through a Study of Risk Perception and Behavior Changes.” 2018. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=10816996.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

LaPorte, David. “Evaluating Landslide Risk Management in Guatemala City through a Study of Risk Perception and Behavior Changes.” 2018. Web. 20 Apr 2021.

Vancouver:

LaPorte D. Evaluating Landslide Risk Management in Guatemala City through a Study of Risk Perception and Behavior Changes. [Internet] [Thesis]. Colorado School of Mines; 2018. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10816996.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

LaPorte D. Evaluating Landslide Risk Management in Guatemala City through a Study of Risk Perception and Behavior Changes. [Thesis]. Colorado School of Mines; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10816996

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

24. 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 · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 April 20, 2021. 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 (7^th 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. 20 Apr 2021.

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 2021 Apr 20]. 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

25. 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)

Subjects/Keywords: Geophysics

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APA (6^th 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 (16^th Edition):

Munoz, Andrew. “Automatic simultaneous multiple-well ties.” 2014. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Munoz, Andrew. “Automatic simultaneous multiple-well ties.” 2014. Web. 20 Apr 2021.

Vancouver:

Munoz A. Automatic simultaneous multiple-well ties. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2021 Apr 20]. 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

26. 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 guarantee 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 sampling directly in compressed form, 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 wired 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

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Rubin, Marc J. “Efficient and automatic wireless geohazard monitoring.” 2014. Thesis, Colorado School of Mines. Accessed April 20, 2021. 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 (7^th Edition):

Rubin, Marc J. “Efficient and automatic wireless geohazard monitoring.” 2014. Web. 20 Apr 2021.

Vancouver:

Rubin MJ. Efficient and automatic wireless geohazard monitoring. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2021 Apr 20]. 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

Colorado School of Mines

27. Luo, Simon S. Improved methods of reflection seismic data processing for velocity estimation, imaging, and interpretation.

Degree: 2015, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3668324

► Seismic images and the geologic information they provide contribute significantly to our understanding of the earth's subsurface. In this thesis, I focus on methods… (more)

▼ Seismic images and the geologic information they provide contribute significantly to our understanding of the earth's subsurface. In this thesis, I focus on methods relevant for constructing and interpreting seismic images, including methods for velocity estimation, seismic imaging, and interpretation, which together address key aspects of reflection seismic data processing. Specifically, I propose improved methods for semblance-based normal-moveout velocity analysis, for seismic imaging by least-squares migration, and for the automatic extraction of geologic horizons. To compute a seismic image, an estimate of the subsurface velocity is needed. One common method for constructing an initial velocity model is semblance-based normal-moveout (NMO) velocity analysis, in which semblance spectra are analyzed to identify peaks in semblance corresponding to effective NMO velocities. The accuracy of NMO velocities obtained from semblance spectra depends on the sensitivity of semblance to changes in velocity. By introducing a weighting function in the semblance calculation, I emphasize terms that are more sensitive to velocity changes, which, as a result, increases the resolution of semblance spectra and allows for more accurate NMO velocity estimates. Following velocity analysis, a seismic image of the subsurface is computed by migrating the recorded data. However, while velocity analysis is an important step in processing reflection seismic data, in practice we expect errors in the velocity models we compute, and these errors can degrade a seismic image. Instead of minimizing the difference between predicted and observed seismic data as is done for conventional migration, I propose to minimize the difference between predicted and time-shifted observed data, where the time shifts are the traveltime differences between predicted and observed data. With this misfit function, an image computed for an erroneous velocity model contains features similar to those obtained using a more accurate velocity. Once a seismic image is computed, a common task in interpreting the image is the identification of geologic horizons. As an alternative to manual picking or autotracking, I propose methods to automatically and simultaneously extract all horizons within an image. To extract geologic horizons, a seismic image is unfaulted and unfolded to restore horizons to an undeformed, horizontal state from which they can be easily identified and extracted.

Subjects/Keywords: Geophysics

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APA (6^th Edition):

Luo, S. S. (2015). Improved methods of reflection seismic data processing for velocity estimation, imaging, and interpretation. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3668324

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Luo, Simon S. “Improved methods of reflection seismic data processing for velocity estimation, imaging, and interpretation.” 2015. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3668324.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Luo, Simon S. “Improved methods of reflection seismic data processing for velocity estimation, imaging, and interpretation.” 2015. Web. 20 Apr 2021.

Vancouver:

Luo SS. Improved methods of reflection seismic data processing for velocity estimation, imaging, and interpretation. [Internet] [Thesis]. Colorado School of Mines; 2015. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3668324.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Luo SS. Improved methods of reflection seismic data processing for velocity estimation, imaging, and interpretation. [Thesis]. Colorado School of Mines; 2015. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3668324

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

28. Yang, Peifang. Making tradeoffs for environmental protection and policy design.

Degree: 2014, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3610182

► There are always painful tradeoffs in environmental problems. In the current period, the tradeoff. has to be made between consuming environmental goods and "dirty"… (more)

Subjects/Keywords: Economics, Environmental; Economics, General

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APA (6^th Edition):

Yang, P. (2014). Making tradeoffs for environmental protection and policy design. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3610182

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yang, Peifang. “Making tradeoffs for environmental protection and policy design.” 2014. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=3610182.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yang, Peifang. “Making tradeoffs for environmental protection and policy design.” 2014. Web. 20 Apr 2021.

Vancouver:

Yang P. Making tradeoffs for environmental protection and policy design. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3610182.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yang P. Making tradeoffs for environmental protection and policy design. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3610182

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

29. Douma, Johannes. Improved temporal and spatial focusing using deconvolution| theoretical, numerical and experimental studies.

Degree: 2014, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1554397

► Time Reversal can be used to time reverse and propagate the measured scattered wave- forms to a point in both time and space, ideally… (more)

▼ Time Reversal can be used to time reverse and propagate the measured scattered wave- forms to a point in both time and space, ideally to a delta function δ([special characters omitted])δ(t). This is commonly referred to as time reversal focusing and has led to time reversal being applied in a wide variety of fields such as medicine, communications, nondestructive evaluation (NDE), and seismology. In practice, time reversal is not optimal for generating a delta function focus if certain conditions are not upheld. For time reversal to work perfectly, the following four conditions must be present: (1) one must record for an infinitely long period of time; (2) Green's functions must be assumed to contain infinite bandwidth; (3) attenuation must be absent within the medium; and (4) one must have full coverage of the wavefield. Due to the need for these conditions, much research is being carried out in order to enhance the time reversal process in practice. We introduce deconvolution, a simple and robust approach, in order to calculate an optimal signal for back propagation designed to give an improved focus. We demonstrate experimentally that deconvolution is able to dramatically improve the temporal focus com- pared to time reversal. Through a joint project with Los Alamos National Laboratory, we compared time reversal to deconvolution. The results showed that deconvolution was able to dramatically improve the temporal focus for a source and a receiver which were both located on the surface of our object. We then continued our experimental studies of deconvolution by doing a joint project with researcher Dr. Ernst Niederleithinger from the Federal Institute for Materials Research and Testing (BAM). For this experiment, we placed multiple sources within a concrete block and recorded the source wavefields on the surface with a single re- ceiver. This experiment was designed to further test the robust nature of deconvolution and compare its temporal focusing capability to that of time reversal. All of these experimental studies show that deconvolution was able to improve the temporal focus compared to time reversal. We continued our comparison study between time reversal and deconvolution and demon- strated theoretically, experimentally, and numerically that deconvolution also improves spa- tial focusing. We give a proof explaining why one would expect improved spatial focusing when there is improved temporal focusing for both a acoustic and elastic media. We then demonstrate in our experiments the improved spatial focus achieved using deconvolution by scanning around the source location with a laser vibrometer at the time of focus for an acoustic case. Finally, we use deconvolution to locate synthetic microseismic events to prove numerically that improved temporal focusing leads to improved spatial focusing for both acoustic and elastic media.

Subjects/Keywords: Geophysics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Douma, J. (2014). Improved temporal and spatial focusing using deconvolution| theoretical, numerical and experimental studies. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1554397

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Douma, Johannes. “Improved temporal and spatial focusing using deconvolution| theoretical, numerical and experimental studies.” 2014. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=1554397.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Douma, Johannes. “Improved temporal and spatial focusing using deconvolution| theoretical, numerical and experimental studies.” 2014. Web. 20 Apr 2021.

Vancouver:

Douma J. Improved temporal and spatial focusing using deconvolution| theoretical, numerical and experimental studies. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1554397.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Douma J. Improved temporal and spatial focusing using deconvolution| theoretical, numerical and experimental studies. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1554397

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado School of Mines

30. Hood, John Calvin. Acoustic monitoring of hydraulic stimulation in granites.

Degree: 2014, Colorado School of Mines

URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1563447

► Enhanced Geothermal Systems (EGS) have substantial potential as a domestic energy source and is well suited as an alternative to diversify the national energy… (more)

Subjects/Keywords: Geotechnology; Engineering, Civil

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hood, J. C. (2014). Acoustic monitoring of hydraulic stimulation in granites. (Thesis). Colorado School of Mines. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1563447

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hood, John Calvin. “Acoustic monitoring of hydraulic stimulation in granites.” 2014. Thesis, Colorado School of Mines. Accessed April 20, 2021. http://pqdtopen.proquest.com/#viewpdf?dispub=1563447.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hood, John Calvin. “Acoustic monitoring of hydraulic stimulation in granites.” 2014. Web. 20 Apr 2021.

Vancouver:

Hood JC. Acoustic monitoring of hydraulic stimulation in granites. [Internet] [Thesis]. Colorado School of Mines; 2014. [cited 2021 Apr 20]. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1563447.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hood JC. Acoustic monitoring of hydraulic stimulation in granites. [Thesis]. Colorado School of Mines; 2014. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1563447

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