Rubble Pile Characterization Model, 2016 Missouri University of Science and Technology
Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. Laboube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll
Rubble piles created following the collapse of a building in a combat situation can significantly impact mission accomplishment, particularly in the area of movement and maneuver. Rubble characteristics must be known, for example, in order to predict the ability of a vehicle to override the collateral damage from weapon effects in urban areas. Two types of models are developed: a first-order model and a first-principles-based model. In both models, we assume complete rubblization of the building and develop a rubble profile model using the size and composition of the collapsed structure to predict the rubble volume. In both cases, this ...
Surface Fracturing Of Armatures Within Helical Flux-Compression Generators, 2016 Missouri University of Science and Technology
Surface Fracturing Of Armatures Within Helical Flux-Compression Generators, Paul Nicholas Worsey, Jason Baird
Tubes of aluminum and of copper filled with C-4 high-explosive were tested during this study of high strain rate effects within thin metallic structures performed as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla. Focusing on the stresses within a relatively thin metallic structure when brisant explosives abutting the structure are detonated, this study directly affects the understanding of flux cutoff and high strain-rate resistivity changes in an expanding armature. The detonation wave is compressive, and the shock waves resulting from its transmission into a thin metallic structure cause both compressive and tensile regions, posing an ...
The Causes Of Armature Surface Fracturing Within Helical Flux-Compression Generators, 2016 Missouri University of Science and Technology
The Causes Of Armature Surface Fracturing Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey
Aluminum and copper tubes filled with explosive were tested during this study of high strain rate effects, as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla, directly affecting the understanding of flux cutoff and high strain-rate changes in generator armatures. Longitudinal cracks characteristically developed in the outer surface of armatures at a smaller expansion ratio than predicted. These cracks occurred within two diameters of the detonator end of the armature but did not extend when the tubing expanded under explosive pressurization. Such cracks appear to cause magnetic flux cutoff, and flux losses seriously affect energy conversion ...
Optical Diagnostics On Helical Flux Compression Generators, 2016 Missouri University of Science and Technology
Optical Diagnostics On Helical Flux Compression Generators, H. Krompholz, Paul Nicholas Worsey, M. Kristiansen, A. A. Neuber, J. C. Dickens, Mark F. C. Schmidt, Jason Baird
Explosively driven magnetic flux compression (MFC) has been object of research for more than three decades. Actual interest in the basic physical picture of flux compression has been heightened by a newly started Department of Defense (DoD) Multi-University Research Initiative. The emphasis is on helical flux compression generators comprising a hollow cylindrical metal liner filled with high explosives and at least one helical coil surrounding the liner. After the application of a seed current, magnetic flux is trapped and high current is generated by moving, i.e., expanding, the liner explosively along the winding of the helical coil. Several key ...
Effects Of Defects On Armatures Within Helical Flux-Compression Generators, 2016 Missouri University of Science and Technology
Effects Of Defects On Armatures Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey, Mark F. C. Schmidt
Tubes of aluminum and copper filled with C-4 high-explosive were tested during this study of the effects of explosive flaws and voids, their sizes and locations, and of the effects of armature machining tolerances on the expansion characteristics of armatures within helical flux-compression generators. Flaws and voids were introduced into the explosive fill of 6061-T6 aluminum armatures during assembly. The defects were located along the major axis of the fill, midway between the major axis and the explosive/armature interface, and at the interface. The resulting effects on armature expansion were recorded by high-speed framing camera, intensified charge-coupled display (ICCD ...
An Analysis And Policy Implications Of Comfort Levels Of Diverse Constituents With Reported Units For Blast Vibrations And Limits: Closing The Communication Gap, Braden Lusk
"Differences exist between public perception of construction blasting and quarry blasting. In general, people are able to tolerate short term inconveniences much better than long term ones. Quarries and other long term mining operations utilizing blasting are coming under increasing public and legislative pressure in the United States. The question being posed for the blasting industry is, "Has our past haste in adopting complex scientific scales and units been detrimental to us?" In other words, are the most palatable things being reported? The goal of this dissertation is to determine whether current units create an atmosphere of discomfort among neighbors ...
The Lagging State Of Renewable Energy In Kentucky, 2016 Western Kentucky University
The Lagging State Of Renewable Energy In Kentucky, John Evans
Honors College Capstone Experience/Thesis Projects
It is evident that Kentucky's energy landscape is characterized primarily by coal and, to a lesser degree, natural gas and oil. It seems there's almost no room for renewable energy sources in Kentucky’s energy sector despite plentiful evidence of global climate change caused largely by carbon dioxide emissions from fossil fuels. Other states are paving the way in the renewable energy industry by investing in solar, wind and geothermal energy among other forms while Kentucky continues to sit back seemingly content with utilizing energy practices that are several decades old. In this project, I will be addressing ...
A Life Cycle Assessment Of A Uranium Mine In Namibia, 2016 University of South Florida
A Life Cycle Assessment Of A Uranium Mine In Namibia, Janine Lambert
Graduate Theses and Dissertations
Uranium mining and nuclear power is a controversial topic as of late, especially in light of the recent Fukushima event. Although the actual use of nuclear fuel has minimal environmental impact, its issues come at the very beginning and end of the fuel’s life cycle in both the mining and fuel disposal process. This paper focuses on a life cycle analysis (LCA) of uranium mine in the desert nation of Namibia in Southern Africa. The goal of this LCA is to evaluate the environmental effects of uranium mining. The LCA focuses on water and energy embodiment such that they ...
Haul Truck Tires Recycling, 2016 University of Arkansas, Fayetteville
Haul Truck Tires Recycling, Jessica N. Lizarazu
Chemical Engineering Undergraduate Honors Theses
The disposal of large Off-the-Road (OTR) tires is an increasingly important concern. These tires can weigh up to 8,450 pounds with an overall diameter and width of approximately 140.7 inches and 45.1 inches respectively. OTR tires are used for mining vehicles such as haul trucks, wheel loaders, backhoes, graders, and trenchers. These new tires cost between $38,000 and $50,000 each, depending on multiple factors including oil prices and the cyclical nature of the industry. Haul trucks contain six tires per vehicle, and mines replace these tires around every 9-12 months. Statistics regarding discarded OTR tires ...
Determine The Potential Drill Utilization Improvements And Rock Fragmentation Requirements Using Directional Drilling In A Coal Mining Overburden Highwall Application, 2016 Montana Tech of the University of Montana
Determine The Potential Drill Utilization Improvements And Rock Fragmentation Requirements Using Directional Drilling In A Coal Mining Overburden Highwall Application, Kevin Dill
Graduate Theses & Non-Theses
This project analyzed the efficiency of incorporating the use of directional drilling technology into coal overburden blasting. Directional drilling is currently in use in the petroleum industry and it is believed that it will be a valuable asset in the mining industry. This project has shown that directional drilling can be a viable technology for use in the coal overburden removal process resulting in increased drill utilization and potential for cost savings. Future work regarding blasting and geotechnical evaluation should be performed to solidify the concept.
Pseudo Leadership And Safety Culture, 2016 Montana Tech
Pseudo Leadership And Safety Culture, T. W. Camm
Search Amazon.com using the keyword “leadership,” and you are rewarded with a list of over 144,000 titles. There is no shortage of books and articles, many of them well written, with excellent ideas. So why is there still a constant cry for effective leadership in organizations? Often, the person in charge has personal blinders that prevent them from seeing or understanding how to implement the newest leadership idea or method. Either deliberately or subliminally, there is a disconnect from learning about leadership, and actually modelling and implementing what has been learned. Some current research in leadership theory can ...
Pore Pressure Measurement Instrumentation Response To Blasting, 2016 University of Kentucky
Pore Pressure Measurement Instrumentation Response To Blasting, Kylie M. Larson-Robl
Theses and Dissertations--Mining Engineering
Coal mine impoundment failures have been well documented to occur due to an increase in excess pore pressure from sustained monotonic loads. Very few failures have ever occurred from dynamic loading events, such as earthquakes, and research has been done regarding the stability of these impoundment structures under such natural seismic loading events. To date no failures or damage have been reported from dynamic loading events caused by near-by production blasting, however little research has been done considering these conditions. Taking into account that current environmental restrictions oblige to increase the capacity of coal impoundments, thus increasing the hazard of ...
Modern Rock Dust Development And Evaluation For Use In Underground Coal Mines, 2016 University of Kentucky
Modern Rock Dust Development And Evaluation For Use In Underground Coal Mines, Robert Eades
Theses and Dissertations--Mining Engineering
Following the promulgation of new permissible respirable dust standards by MSHA in 2014, new alternative rock dusts were created that combined the advantages of current industry applications while potentially reducing miner exposure to respirable dust. Research was performed to compare the explosion suppressing and ejection characteristics of three new types of rock dust to existing rock dust types. Explosion suppression tests were conducted in a 38-L chamber where pressures were recorded. Angle of ejection tests were conducted using a high explosive shock tube and high speed photography to determine angle of ejection and lift velocity. A comprehensive comparison of the ...
Techno-Economic Potential Of Enhanced Coal Recovery Through Middlings Liberation And Re-Processing, 2016 University of Kentucky
Techno-Economic Potential Of Enhanced Coal Recovery Through Middlings Liberation And Re-Processing, Shivani
Theses and Dissertations--Mining Engineering
The typical preparation plant producing coal for the utility market targets a relative separation density in the plant of around 1.60 whereas plants generating metallurgical coal use relative cut point density values approaching 1.50. In some cases, achieving the specified coal quality requires operating at lower cut point values, which results in a significant loss of valuable coal. In these situations, a middlings stream can be produced using a secondary separator or a three-product unit, which would allow crushing of the middlings for liberation purposes and re-introduction into the plant feed. In this manner, higher quality coal can ...
Rock Dust Surface Chemistry Modifications For Eliminating Cake Formation And Improving Dispersion In Coal Dust Explosion Mitigation Applications, Qingqing Huang
Theses and Dissertations--Mining Engineering
Rock dust has been historically applied to mitigate the coal dust explosion in either dry or wet form. Dry rock dust performs best in inerting the potential coal dust explosion due to the greatest dispersive properties. However, it undesirably exposes underground coal miners to respirable dust particles which imposes a severe health danger. Wet dust application is able to significantly reduce the floatable dust particles but another problem associated with caking is predominant. Caking phenomenon is usually used to describe the change of free-flowing bulk solids into agglomerated chunks. Unfortunately, the environmental conditions of an underground mine have the potential ...
Utilization Of A Small Unmanned Aircraft System For Direct Sampling Of Nitrogen Oxides Produced By Full-Scale Surface Mine Blasting, Robert B. Mccray
Theses and Dissertations--Mining Engineering
Emerging health concern for gaseous nitrogen oxides (NOx) emitted during surface mine blasting has prompted mining authorities in the United States to pursue new regulations. NOx is comprised of various binary compounds of nitrogen and oxygen. Nitric oxide (NO) and nitrogen dioxide (NO2) are the most prominent. Modern explosive formulations are not designed to produce NOx during properly-sustained detonations, and researchers have identified several causes through laboratory experiments; however, direct sampling of NOx following full-scale surface mine blasting has not been accomplished.
The purpose of this thesis was to demonstrate a safe, innovative method of ...
Mechanics Of Impulse Force Reduction For Mitigating Dump Truck Vibrations Under Hislo Conditions, 2016 Missouri University of Science and Technology
Mechanics Of Impulse Force Reduction For Mitigating Dump Truck Vibrations Under Hislo Conditions, Danish Ali
"The deployment of large capacity shovels and dump trucks, for achieving economic bulk production capacities, has resulted in high impact shovel loading operations (HISLO). These large shovels generate high impact forces when loading dump trucks with over 100-ton passes under gravity. The impact forces also generate high frequency shock waves, which cause severe truck vibrations, and thus, expose dump truck operators to high levels of whole body vibrations (WBV). The dynamic impact force generates these vibrations, and thus, there is a need to develop efficient technologies to eliminate or reduce its impact. Existing literature and industry practice show that this ...
Subterranean Photobioreactors For Commercial-Industrial Scale Algal Culture, 2016 Missouri University of Science and Technology
Subterranean Photobioreactors For Commercial-Industrial Scale Algal Culture, Daniel James Vidt
"There are many potential benefits to the mining industry accruing from the application of algal biotechnology. The main benefits are in the production of biodiesel and in the remediation of mining brownfields. The research in this study was centered in the original idea that these brownfields represent a tremendous opportunity for use as a hybrid model for redevelopment into sustainable "mines" of biomass. The ability of these underground spaces serving as bioreactors to control all aspects of the growing environment, from lighting, to temperature, to biosecurity, are key advantages that have been identified in the literature. The many benefits inherent ...
Artificial Neural Network Approach To Predict Blast-Induced Ground Vibration, Airblast And Rock Fragmentation, 2016 Missouri University of Science and Technology
Artificial Neural Network Approach To Predict Blast-Induced Ground Vibration, Airblast And Rock Fragmentation, Raymond Ninnang Tiile
"Blasting has been widely used as an economical and cheap way of rock breakage in mining and civil engineering applications. An optimal blast yields the best fragmentation in a safe, economic and environmentally friendly manner. The degree of fragmentation is vital as it determines to a large extent the utilization of equipment, productivity and mill throughput. Explosive energy, besides rock fragmentation, creates health and safety issues such as ground vibration, air blast, fly rock, and back breaks among others. As a result, the explosive energy impacts structures and buildings located in the vicinity of the blasting operation, and causes human ...
Investing In Least Developed Countries: The Aynak Mine Project, 2016 Walden University
Investing In Least Developed Countries: The Aynak Mine Project, Roosevelt Barfield
Walden Dissertations and Doctoral Studies
The rise of market globalization creates challenges for business executives seeking to pursue foreign direct investment (FDI) in least developed countries (LDC), such as Afghanistan. Multinational corporate (MNC) executives need strategies that will improve the timely delivery of minerals for mining projects in LDCs. Guided by the force field analysis theory, the purpose of this holistic, single-case study was to explore the strategies that 5 MNC executives in Beijing, China, used to improve the timely delivery of minerals associated with the Aynak copper mine project in Afghanistan. Semistructured interviews were used to elicit detailed narratives from MNC executives about their ...