Characterization Of Rabinal, Guatemala Clay And Development Of An Engineered Surrogate For The Purpose Of Laboratory Study, 2013 Missouri University of Science and Technology
Characterization Of Rabinal, Guatemala Clay And Development Of An Engineered Surrogate For The Purpose Of Laboratory Study, Lara Anne Hubbel
"Ceramic pot filters (CPFs) have been proven to be an effective, low cost household water treatment system that are commonly used in third world countries. They are made using local clay, burn out material and colloidal silver or silver nitrate. Challenges faced by researchers include difficulty in acquiring filters from their manufacturing facilities without incurring damage and the cost of shipping. Acquiring the clay material used to make the filters is also difficult due to the cost of shipping and permits necessary to import soil. There have been studies conducted that compared laboratory made CPFs made with native clay and ...
A Modification Of Freeze-Core Technology For Collecting Granular Fluvial Sediment Samples, 2013 Missouri University of Science and Technology
A Modification Of Freeze-Core Technology For Collecting Granular Fluvial Sediment Samples, David Charles Smith
"The presence of coarse grained sediment can potentially reduce the effectiveness of conventional sampling methods in recovering fluvial sediments. A modification to freeze-core technology was used to collect fine grained sediments for the purpose of characterizing the extent of heavy metal contamination in fluvial deposits that contain significant amounts of coarse-grained material such as cobbles and boulders. This material greatly reduces the effectiveness of conventional sampling methods. This method uses 2.5-cm and 2.9-cm diameter by 30-cm long finned samplers that were mechanically- and hand-driven into the ground. The sediment is frozen to the outside of the sampler by ...
Joint Diagonalization Applied To The Detection And Discrimination Of Unexploded Ordnance, 2012 Dartmouth College
Joint Diagonalization Applied To The Detection And Discrimination Of Unexploded Ordnance, Fridon Shubitidze, Juan Pablo Fernández, Irma Shamatava, Benjamin Barrowes, Kevin O’Neill
Open Dartmouth: Peer-reviewed articles by Dartmouth faculty
Efforts to discriminate buried unexploded ordnance from harmless surrounding clutter are often hampered by the uncertainty in the number of buried targets that produce a given detected signal. We present a technique that helps determine that number with no need for data inversion. The procedure is based on the joint diagonalization of a set of multistatic response (MSR) matrices measured at different time gates by a time-domain electromagnetic induction sensor. In particular, we consider the Naval Research Laboratory’s Time-Domain Electromagnetic Multisensor Towed Array Detection System (TEMTADS), which consists of a 5×5 square grid of concentric transmitter/receiver pairs ...
Visualizing And Modeling Interior Spaces Of Dangerous Structures Using Lidar, 2012 Missouri University of Science and Technology
Visualizing And Modeling Interior Spaces Of Dangerous Structures Using Lidar, Norbert H. Maerz, T. K. Assebaum, Dustin J. Williams, K. Shea, Yongjian Xi, Xiaoling Li, Ye Duan
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
LIght Detection and Ranging (LIDAR) scanning can be used to safely and remotely provide intelligence on the interior of dangerous structures for use by first responders that need to enter these structures. By scanning into structures through windows and other openings or moving the LIDAR scanning into the structure, in both cases carried by a remote controlled robotic crawler, the presence of dangerous items or personnel can be confi rmed or denied. Entry and egress pathways can be determined in advance, and potential hiding/ambush locations identifi ed. This paper describes an integrated system of a robotic crawler and LIDAR ...
Influence Of Capillary Heterogeneity On Leakage Of Co2 From A Borehols, 2012 University of Mississippi
Influence Of Capillary Heterogeneity On Leakage Of Co2 From A Borehols, Frank Roecker
Electronic Theses and Dissertations
We used a modified invasion percolation (MIP) model to examine the effect of capillary heterogeneity, buoyancy forces, and viscous forces on the surface area and saturation of a CO2 plume leaking into a shallow aquifer. The purpose of this study is to provide a better understanding of how CO 2 migrates from a borehole, which is essential in implementing effective simulation and monitoring regimes to accurately detect CO2 leakage from sequestration sites. The MIP model approach will simulate invasion of a light non-wetting fluid (e.g., CO2) into a medium initially saturated with a dense wetting fluid (water). The style ...
The Use Of Electrical Resistivity Tomography (Ert) To Delineate Water-Filled Vugs Near A Bridge Foundation, 2012 Missouri University of Science and Technology
The Use Of Electrical Resistivity Tomography (Ert) To Delineate Water-Filled Vugs Near A Bridge Foundation, Jeremiah Chukwunonso Obi
"A structural support was needed to strengthen the load-bearing capacity of an unnamed bridge foundation in Laclede County in South-Central Missouri due to increasing traffic volume and age of the bridge. This area is characterized by karstic features such as losing streams, underground caves and sinkholes. During the construction of a drilled shaft for the substructure, a few feet north of the north footing of the pier, voids were noted beneath a roughly 2 foot thick cap of dolomite rock. Because of this, there were concerns about the integrity of the rock beneath the existing bridge foundation. Consequently, subsurface investigation ...
Performance Characterization And Optimization Of Microgrid-Based Energy Generation And Storage Technologies, 2012 Missouri University of Science and Technology
Performance Characterization And Optimization Of Microgrid-Based Energy Generation And Storage Technologies, Joe D. Guggenberger Ii
"Renewable energy-powered microgrids have proven to be a valuable technology for self-contained (off-grid) energy systems. Characterizing microgrid system performance pre-deployment would allow the system to be appropriately sized to meet all required electrical loads at a given renewable source operational time frequency. A vanadium redox battery was empirically characterized to determine operating efficiency as a function of charging characteristics and parasitic load losses. A model was developed to iteratively determine system performance based on known weather conditions and load requirements. A case study was performed to compare modeled system performance to measurements taken during operation of the microgrid system. Another ...
Measuring The Orientations Of Hidden Subvertical Joints In Highways Rock Cuts Using Ground Penetrating Radar In Combination With Lidar, 2012 Missouri University of Science and Technology
Measuring The Orientations Of Hidden Subvertical Joints In Highways Rock Cuts Using Ground Penetrating Radar In Combination With Lidar, Adnan Mohammed Aqeel
"Mapping discontinuities in rock cuts and measuring their orientations is crucial in assessing the stability of rock masses. This can be done usually using manual methods such as scanline or advanced techniques such as LIDAR. However, these methods are used only to map exposed discontinuities which may cause underestimation for slope stability. Accordingly, ground penetrating radar (GPR) has been recently used to detect such hidden discontinuities.
The used 400 MHz monostatic GPR antenna was significantly able to detect and map hidden subvertical joints within 4 m depths in five sandstone highways rock cuts and within 3 m depths in two ...
Saturation Effects On Mechanical Excavatability Of Roubidoux Sandstone Under Selected Rock Cutting Tools, 2012 Missouri University of Science and Technology
Saturation Effects On Mechanical Excavatability Of Roubidoux Sandstone Under Selected Rock Cutting Tools, Muhammad Zubair Abu Bakar
"This study investigated the differences in the cutting performance of two rock cutting tools in dry and saturated rock. For this purpose, a permeable quartzose sandstone was subjected to a series of full scale linear rock cutting tests, in both dry and saturated conditions, using a constant cross-section (CCS) disc cutter and a radial drag pick at a constant cutting speed.
In this rock, saturation with water reduced the forces acting on the disc cutter by 27-48% (significant at 90% confidence), but also reduced the chip yield by nearly as much. Even though the specific energy of fragmentation went down ...
Surface Expressions Of Discontinuities, And The Estimation Of Their 3-D Orientations Using Combined Lidar And Optical Imaging, 2012 Missouri University of Science and Technology
Surface Expressions Of Discontinuities, And The Estimation Of Their 3-D Orientations Using Combined Lidar And Optical Imaging, James Nii Aboh Otoo
"The importance of the collection and analysis of data on discontinuities cannot be overemphasized. Problems which include sampling difficulties, risks, limited access to rock faces and exposures, and the delay in data collection has led to a high need for data collection tools and analysis techniques that can overcome these problems.
Discontinuities manifest themselves as either traces or as facets. Traces are linear features that intersect with both the discontinuity and the rock cut. Facets are the actual discontinuity surfaces that are exposed in the rock cut. Facets can be natural or induced. Identifying a facet as either natural or ...
A Deterministic Method Of Predicting Long-Term Pile Capacity In Cohesive Soils After The Dissipation Of Excess Pore Water Pressure, Eric J. Steward
Pile setup or freeze is a phenomenon where the bearing capacity of a pile increases over time both during and after the dissipation of pore pressure and the stabilization of lateral earth pressure. Driven piles gain capacity after installation because of the dissipation of excess pore pressure and soil aging. Incorporating accurate setup prediction into the design of the piles can significantly reduce the cost of many projects by reducing the size or number of required piles. Various simple, empirical mathematical models have been developed to predict pile setup. However, these models are often unreliable, resulting in very conservative designs ...
A Field Validation Of Dam Indexing Methods In Mississippi, 2011 University of Mississippi
A Field Validation Of Dam Indexing Methods In Mississippi, Steven Thomas Fox
Electronic Theses and Dissertations
Indexing methods are applied to dam inventories throughout the United States to assist in prioritizing resources to maintain aging dam structures. Three published indexing methods and one proposed method were applied to 24 dams through Mississippi. The majority of dams in Mississippi have little to no information concerning the performance records or design specifics of a given dam. Field assessments were conducted to determine the physical condition of each dam, identify potentially deficiencies at dams, and calculate a consequence in the event of a dam failure. The results of the four indexing methods will be compared and advantages and disadvantages ...
Characterization Of The Engineering Properties And Economic Potential Of The Transitional Clay Unit Of The Ripley Formation, Northeast Mississippi, Richard Christopher Wheeler
Electronic Theses and Dissertations
Expansive soils, throughout Mississippi and the U.S., have long been a source of problems within the engineering and construction industries, leading to billions of dollars in damage annually. Along with being a source of problems, the clays throughout Mississippi are also of economic importance, being mined for a variety of uses. In this study, the engineering properties of the transitional clay facies of the Ripley Formation are studied, to characterize the swell potential of the transitional clay, and to assist with the evaluation of the possible commercial uses of the soil. The transitional clay is an Upper Cretaceous unit ...
Waterjet Injection Of Powdered Activated Carbon For Sediment Remediation, 2011 Missouri University of Science and Technology
Waterjet Injection Of Powdered Activated Carbon For Sediment Remediation, Chris J. Redell
"In situ sediment remediation through waterjet-activated carbon amendment delivery is an innovative means to mitigate the dangers posed by hydrophobic organic compounds. Ease of use and applicability to inundated environments makes this technique valuable. This work made feasible low-pressure injections of a 15% (by dry weight) carbon/water slurry through a pulsating piston pump waterjet. The project fabricated nozzle tips and a unique injection apparatus comprising a quantitative system for the evaluation of bench scale models. Based on a series of iterative processes, injections of carbon were analyzed for depth and concentration. Injections varied in duration and they were made ...
Visual Inspection And Ground Penetrating Radar Investigation Of The Historical Pulaski County Poor Farm Cemetery, 2011 Missouri University of Science and Technology
Visual Inspection And Ground Penetrating Radar Investigation Of The Historical Pulaski County Poor Farm Cemetery, Ibrahim E. Ahmed
"This thesis is a comprehensive summary of the geotechnical investigation of the Historical Pulaski County Poor Farm Cemetery, southeast Waynesville, Missouri. This research demonstrates that unmarked graves in an abandoned historical cemetery can be located using visual site inspection and ground penetrating radar techniques.
During the course of these investigations, multiple visual site inspections of Pulaski County Poor Farm Cemetery were conducted and ground penetrating radar data were acquired. Based on the visual site inspections and the interpretation of ground penetrating radar data, a total of one-hundred and fifty-one (151) graves were identified; eighty-seven (87) of the graves were mapped ...
Using Conditional Probability To Predict Solar-Powered Pump-And-Treat Performance, 2011 Missouri University of Science and Technology
Using Conditional Probability To Predict Solar-Powered Pump-And-Treat Performance, Erica RenéE Collins
"Green and sustainable remediation can be further environmentally friendly by using renewable energy systems in place of utility-provided power. This project includes the installation of a single-axis tracking photovoltaic (PV) array at a former dry cleaning site that is undergoing remediation under the Missouri Department of Natural Resources (MODNR) Dry cleaning Environmental Response Trust (DERT) Fund program. The PV array provided power to a positive displacement piston pump that extracted ground water from a 15 m deep monitoring well. The tetrachloroethene (PCE)-contaminated ground water was treated using granular activated carbon (GAC) units prior to discharge to the local publicly ...
Effects Of Soil Aggregates On Debris-Flow Mobilization: Results From Ring-Shear Experiments, 2010 Iowa State University
Effects Of Soil Aggregates On Debris-Flow Mobilization: Results From Ring-Shear Experiments, Neal R. Iverson, Janet E. Mann, Richard M. Iverson
Geological and Atmospheric Sciences Publications
Rates and styles of landslide motion are sensitive to pore-water pressure changes caused by changes in soil porosity accompanying shear deformation. Soil may either contract or dilate upon shearing, depending upon whether its initial porosity is greater or less, respectively, than a critical-state porosity attained after sufficiently high strain. We observed complications in this behavior, however, during rate-controlled (0.02 m s− 1) ring-shear experiments conducted on naturally aggregated dense loamy sand at low confining stresses (10.6 and 40 kPa). The aggregated soil first dilated and then contracted to porosities less than initial values, whereas the same soil with ...
Source Attribution And Interannual Variability Of Arctic Pollution In Spring Constrained By Aircraft (Arctas, Arcpac) And Satellite (Airs) Observations Of Carbon Monoxide, J. A. Fisher, D. J. Jacob, M. T. Purdy, M. Kopacz, P. Le Sager, Shiliang Wu, Et. Al.
Michigan Tech Publications
We use aircraft observations of carbon monoxide (CO) from the NASA ARCTAS and NOAA ARCPAC campaigns in April 2008 together with multiyear (2003–2008) CO satellite data from the AIRS instrument and a global chemical transport model (GEOS-Chem) to better understand the sources, transport, and interannual variability of pollution in the Arctic in spring. Model simulation of the aircraft data gives best estimates of CO emissions in April 2008 of 26 Tg month−1 for Asian anthropogenic, 9.4 for European anthropogenic, 4.1 for North American anthropogenic, 15 for Russian biomass burning (anomalously large that year), and 23 for ...
Scaled Experimental Study On Excavation Of Lunar Regolith With Rakes/Rippers And Flat Blade, 2010 Missouri University of Science and Technology
Scaled Experimental Study On Excavation Of Lunar Regolith With Rakes/Rippers And Flat Blade, Masafumi Iai
"As humanity's activities expand to the Moon, Mars, and other extra-terrestrial bodies, it will be necessary to use local resources rather than bringing everything from the Earth. This concept is called In-Situ Resource Utilization (ISRU), which starts with excavation and earthmoving. The present study focuses on loosening and moving of the lunar regolith by a ripper (or rake) and a wide blade with consideration of gravel content. After characterizing the lunar regolith and two of its simulants (JSC-1A and FJS-1), the relationship between the excavation energy and different conditions, namely gravel content, relative density, and tine spacing on a ...