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Articles 1 - 10 of 10
Full-Text Articles in Geological Engineering
Structural Assessment Of Highway "N" Power Substation Under Earthquake Loads, Genda Chen, Dongming Yan, Zuocai Wang, Seth Justin, J. David Rogers, Kazi Rezaul Karim
Structural Assessment Of Highway "N" Power Substation Under Earthquake Loads, Genda Chen, Dongming Yan, Zuocai Wang, Seth Justin, J. David Rogers, Kazi Rezaul Karim
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In this study, the Highway N Substation was analyzed with a finite element model (FEM) for its vulnerability. The 'rigid' bus and electric switch components were characterized with full scale shake table tests. Each component of the substation was carefully modeled with due considerations of mass density, stiffness and geometries. Based on the FEM, modal analysis was conducted to identify the natural frequencies of the structure along with their corresponding mass participation factors. In response spectrum and time history analyses, the dynamic responses of main components, such as 'rigid' buses and switches, were evaluated. The magnitude and location of the …
Technical Note: A New Method For The Lagrangian Tracking Of Pollution Plumes From Source To Receptor Using Gridded Model Output, R. C. Owen, R. E. Honrath
Technical Note: A New Method For The Lagrangian Tracking Of Pollution Plumes From Source To Receptor Using Gridded Model Output, R. C. Owen, R. E. Honrath
Michigan Tech Publications, Part 1
Lagrangian particle dispersion models (LPDMs) are powerful and popular tools used for the analysis of atmospheric trace gas measurements. However, it can be difficult to determine the transport pathway of emissions from their source to a receptor using the standard gridded model output, particularly during complex meteorological scenarios. In this paper we present a method to clearly and easily identify the pathway taken by only those emissions that arrive at a receptor at a particular time, by combining the standard gridded output from forward (e.g., concentration) and backward (e.g., residence time) LPDM simulations. By comparing the pathway determined from this …
Optical Properties Of Coal Combustion Byproducts For Particle-Size Analysis By Laser Diffraction, Robert B. Jewell, Robert F. Rathbone
Optical Properties Of Coal Combustion Byproducts For Particle-Size Analysis By Laser Diffraction, Robert B. Jewell, Robert F. Rathbone
Coal Combustion and Gasification Products Journal Archive
Laser diffraction analysis is commonly used for determining the particle-size distribution (PSD) of fly ash. However, there is currently no standard method for preparing samples and analyzing them. The Mie and Fraunhofer optical models are used to calculate the PSD of fly ash from laser diffraction data. The Mie theory is most applicable for particles smaller than 50 mm, and is therefore the most accurate model for the analysis of fly ash. However, the refractive index (RI) of fly ash is complex and not well known. This study presents the analysis of several supplementary cementitious materials (SCMs) such as coal …
Development Of A One Dimensional Subsurface Contaminant Transport Model With Stochastic Applications, Benjamin Waldon Johnson
Development Of A One Dimensional Subsurface Contaminant Transport Model With Stochastic Applications, Benjamin Waldon Johnson
Masters Theses
"Contaminant source release history is a necessary element of contaminant mass transport simulation in the saturated zone. The source release history is unknown at many sites, and many inverse models have been developed to define finite release histories. To define a likely domain of three source history parameters, a mass balancebased one dimensional approach is developed and tested by discretizing the spatial domain into bands. By incorporating the approach in a spreadsheet model, observed data is represented by both variable length and constant length bands of analysis. Each representation of observed data was tested to determine the most appropriate band …
Application Of Ground Penetrating Radar (Gpr) For Bridge Deck Condition Assessment: Using A 1.5 Ghz Ground-Coupled Antenna, Amos Wamweya
Application Of Ground Penetrating Radar (Gpr) For Bridge Deck Condition Assessment: Using A 1.5 Ghz Ground-Coupled Antenna, Amos Wamweya
Masters Theses
"This study is a GPR-based assessment of three bridge decks, two with a hot bituminous wearing surface and one with a bare concrete slab. The primary objectives of this study were: 1) to assess the integrity of the three bridge decks using a 1.5 GHz ground-coupled GPR antenna, and 2) to evaluate the utility of the 1.5 GHz ground-coupled antenna for bridge deck investigations. Core control (chloride ion concentration data and core integrity data) and visual inspection were used as interpretive constraint. The acquired GPR data were interpreted, and two plan view maps were generated. One depicts the magnitude of …
Wind Power Applications To Groundwater Remediation, Ronald E. Gallagher
Wind Power Applications To Groundwater Remediation, Ronald E. Gallagher
Doctoral Dissertations
"The use of renewable energy systems to power groundwater remediation systems seems like an inherently good idea because of potential cost savings and environmental benefits associated with reduced greenhouse gas emissions. Small wind turbine systems marketed for single residence applications may be the appropriate size for remediation systems, and such wind turbines are readily available at reasonable cost. Another benefit of using domestic wind turbine systems is that they are straightforward to install and operate with minimal training. One of the major drawbacks associated with using wind turbines at remediation sites is that site-specific wind velocity data is typically used …
Membrane Properties Of Intact Rock Cores Of Burlington Limestone, Jefferson Dolomite, Darrington Phyllite, And Low Permeability Concrete, Megan Hart
Doctoral Dissertations
"A number of laboratory studies have shown that clays exhibit membrane properties. However, little research has been performed on lithologies outside of pure clays. Recently, research focusing on mixed sand and clay membrane properties for engineering applications was performed. Still, literature only suggests the possibilities of membrane properties, osmotic or reverse-osmotic, associated with other naturally occurring 'tight' rock types. Therefore, the objectives of this research was to perform a series of hyperfiltration experiments using actual rock discs of Quarry Ridge Jefferson Dolomite, Darrington Phyllite, Lower Burlington Limestone, and low permeability concrete to determine if tight lithologies can function as membranes"--Abstract, …
Analysis Using Surface Wave Methods To Detect Shallow Manmade Tunnels, Niklas Henry Putnam
Analysis Using Surface Wave Methods To Detect Shallow Manmade Tunnels, Niklas Henry Putnam
Doctoral Dissertations
"Multi-method seismic surface wave approach was used to locate and estimate the dimensions of shallow horizontally-oriented cylindrical voids or manmade tunnels. The primary analytical methods employed were Attenuation Analysis of Rayleigh Waves (AARW), Surface Wave Common Offset (SWCO), and Spiking Filter (SF). Surface wave data were acquired at six study sites using a towed 24-channel land streamer and elastic-band accelerated weight-drop seismic source. Each site was underlain by one tunnel, nominally 1 meter in diameter and depth. The acquired surface wave data were analyzed automatically. Then interpretations compared to the field measurements to ascertain the degree of accuracy. The purpose …
A Renewable Energy Feasibility Study To Power A Water Supply Pump In Sacala Las Lomas, Guatemala, William Anthony Granich
A Renewable Energy Feasibility Study To Power A Water Supply Pump In Sacala Las Lomas, Guatemala, William Anthony Granich
Masters Theses
"A clean and sufficient source of drinking water can be a challenge to develop in the rural highlands of Guatemala. Installing a submersible pump in a groundwater well can provide a source of water that is free of contamination and yields sufficient water throughout the year. Submersible pumps are typically powered from grid-power; however, an alternative energy source may be considered. An evaluation of the renewable energy resources has been conducted in Sacala las Lomas de San Martin Jilotepeque, Chimaltenango, Guatemala (Sacala). The drilling of a deep groundwater well has been proposed in Sacala to supply the community with sufficient, …
A Mobile Water Disinfection Unit Powered By Renewable Energy Systems, Matthew Vitello
A Mobile Water Disinfection Unit Powered By Renewable Energy Systems, Matthew Vitello
Masters Theses
"The current method of disinfection of water used by the United States Army requires a significant amount of mobilization and demobilization time as well as being energy intensive. In an effort to improve small unit mobility a need for a light-weight, low maintenance, highly mobile disinfection system has arisen. In addition to the potential military use, a system of this type could provide a safe drinking water product during the aftermath of natural or man-made disasters, reducing the burden on emergency management services. A prototype system was developed that is self-powered, has low maintenance requirements, and can be stored for …