Asymptotic Analysis Of The Differences Between The Stokes-Darcy System With Different Interface Conditions And The Stokes-Brinkman System,
2010
Missouri University of Science and Technology
Asymptotic Analysis Of The Differences Between The Stokes-Darcy System With Different Interface Conditions And The Stokes-Brinkman System, Nan Chen, Max Gunzburger, Xiaoming Wang
Mathematics and Statistics Faculty Research & Creative Works
We consider the coupling of the Stokes and Darcy systems with different choices for the interface conditions. We show that, comparing results with those for the Stokes-Brinkman equations, the solutions of Stokes-Darcy equations with the Beavers-Joseph interface condition in the one-dimensional and quasi-two-dimensional (periodic) cases are more accurate than are those obtained using the Beavers-Joseph-Saffman-Jones interface condition and that both of these are more accurate than solutions obtained using a zero tangential velocity interface condition. the zero tangential velocity interface condition is in turn more accurate than the free-slip interface boundary condition. We also prove that the summation of the …
Multiple Criteria Decision Analysis For The Selection Of A Land Use Impact Method For A Life Cycle Assessment Of Switchgrass As A Bioenergy Feedstock In The Pee Dee Region Of South Carolina,
2010
Clemson University
Multiple Criteria Decision Analysis For The Selection Of A Land Use Impact Method For A Life Cycle Assessment Of Switchgrass As A Bioenergy Feedstock In The Pee Dee Region Of South Carolina, Joel Kohn
All Theses
The interactions of a growing human population and increasing demand for food and energy have led to governmental and social pressures encouraging the adoption of biofuels as a substitute for fossil energy sources; however, several potential biofuel feedstocks can compete directly with food products for valuable land area. Life Cycle Assessment (LCA) is a tool that examines the environmental impacts of a product or process and can assist decision makers in the development of policy. The environmental impacts of land use are not well incorporated into LCA. As an emerging field, there is no consensus regarding the best methods by …
A Verifying Compiler For Embedded Networked Systems,
2010
Clemson University
A Verifying Compiler For Embedded Networked Systems, Kalyan Chakradhar Regula
All Theses
Embedded networked devices are required to produce dependable outputs and communicate with peer devices given limited computing resources. These devices monitor and control processes within the physical world. They are used in applications related to environmental monitoring, telecommunications, social networking, and also life-critical applications in domains such as health care, aeronautics, and automotive manufacturing. For such applications, software errors can be costly - both in terms of nancial and human costs. Therefore, software programs installed on these devices must meet the appropriate requirements. To guarantee this, one must verify that the implemented code meets the corresponding specications. Manual trial-and-error validation …
Impact Of Microsparticle Concentration Levels Upon Toxicity Of Phenol To Artemia,
2010
Clemson University
Impact Of Microsparticle Concentration Levels Upon Toxicity Of Phenol To Artemia, Federico Sinche
All Theses
Plastic pollution constitutes a threat to marine wildlife because of the deleterious impacts ranging from entanglement to ingestion of plastic debris. However, knowledge regarding the impacts of fragmented plastics into micron sizes and their interaction with other toxicants in the marine environment is still limited. In the present study the impact of polystyrene microspheres, 3 µm in diameter, upon toxicity of phenol to the brine shrimp Artemia was investigated in acute toxicity tests. The brine shrimp are employed as a model organism in marine toxicity tests. Phenol is a hydrophobic compound used as an intermediate resin discharged to the environment. …
Hydromechanical Interference Slug Tests In A Fractured Biotite Gneiss,
2010
Clemson University
Hydromechanical Interference Slug Tests In A Fractured Biotite Gneiss, Trever Slack
All Theses
Fractures are ubiquitous in the shallow crust and they commonly control the flow and storage of fluids in rock. Estimating transmission and storage properties resulting from fractures is commonly accomplished by interpreting the pressure signals caused by stressing an aquifer during a pumping or slug test. Fractures deform in response to pressure changes during well tests, and measuring and interpreting the deformation along with the pressure change is a way to potentially increase the information about storage and transmission properties. Tests where the pressure and deformation are coupled are called hydromechanical well tests. Previous investigations have focused on the effects …
Quantum Codes From Two-Point Hermitian Codes,
2010
Clemson University
Quantum Codes From Two-Point Hermitian Codes, Justine Hyde-Volpe
All Theses
We explore the background on error-correcting codes, including linear codes and quantum codes from curves. Then we consider the parameters of quantum codes constructed from two-point Hermitian codes.
Parallel √3-Subdivision With Animation In Consideration Of Geometric Complexity,
2010
Clemson University
Parallel √3-Subdivision With Animation In Consideration Of Geometric Complexity, Stephen Cooney
All Theses
We look at the broader field of geometric subdivision and the emerging field of parallel computing for the purpose of creating higher visual fidelity at an efficient pace. Primarily, we present a parallel algorithm for √3-Subdivision. When considering animation, we find that it is possible to do subdivision by providing only one variable input, with the rest being considered static. This reduces the amount of data transfer required to continually update a subdividing mesh. We can support recursive subdivision by applying the technique in passes. As a basis for analysis, we look at performance in an OpenCL implementation that utilizes …
Creating Touchpanel Graphics For Control Systems,
2010
Clemson University
Creating Touchpanel Graphics For Control Systems, Lucas Mcdaniel
All Theses
More often than system designers would like to admit, a discrepancy lies between the implementation of audiovisual control systems and their apparent ease of use to a novice or casual user. System designers and programmers are often hampered by the software tools provided by industry manufacturers and cannot reliably create desirable graphical interfaces that match the level of systems they are asked to program and install.
Popular consumer trends in portable touchscreen devices, pioneered on devices such as the Apple iPhone, light a way forward into a new era of elegantly solving the audiovisual control system graphical user interface problem. …
Metalloporphyrin-Catalyzed Reduction Reactions Of Hexavalent Chromium,
2010
Clemson University
Metalloporphyrin-Catalyzed Reduction Reactions Of Hexavalent Chromium, Rong Zhang
All Theses
Previous studies have demonstrated that the reduction of oxidized organic and inorganic contaminants could be catalyzed by electron shuttle systems, which generally were biological organic macrocycle complexes with transition metals. Metalloporphyrins (MPs) and their derivatives are well known electron shuttles for many biogeochemical systems. The objective of this research was to study the catalytic capabilities of selected MPs for the reduction of hexavalent chromium (Cr(VI)) in the presence of reducing agents. Zero valent iron (ZVI) was chosen as the primary electron donor in the experimental systems. Protoporphyrin IX (Proto) and Uroporphyrin I (Uro) are naturally occurring porphyrins produced during heme …
Factors Influencing The Adsorption Of Synthetic Organic Compounds By Carbon Nanotubes In Aquatic Environments,
2010
Clemson University
Factors Influencing The Adsorption Of Synthetic Organic Compounds By Carbon Nanotubes In Aquatic Environments, Ting Shao
All Theses
Carbon nanotubes (CNTs) are allotropes of carbon consisting of sheets of carbon atoms covalently bonded in hexagonal arrays that are seamlessly rolled into a hollow, cy-lindrical shape with both ends rounded by fullerene-like caps. As large amounts of CNTs have been manufactured and significant growth is expected in commercial CNT produc-tion, there is a major concern over their health and environmental risks once they enter into the environment. In aquatic systems, CNTs are likely to adsorb organic chemicals and aggregate as bundles due to their extremely hydrophobic surfaces. The aggregation state of CNTs plays a significant role in their fate …
Synthesis And Characterization Of Monolayer Protected Gold Nanoparticles And A Gold-Titanium Dioxide Nanocomposite Intended For Photocatalytic Degradation Of Environmental Pollutants,
2010
Western Michigan University
Synthesis And Characterization Of Monolayer Protected Gold Nanoparticles And A Gold-Titanium Dioxide Nanocomposite Intended For Photocatalytic Degradation Of Environmental Pollutants, Piyadarsha Amaratunga
Dissertations
Semiconductor and metal clusters in the nanometer size regime display interesting optical, electronic and chemical properties that are size dependant. Highly monodisperse gold nanoparticles of different sizes have been synthesized and isolated by newly developed methodologies, using tiopronin as the capping ligand. Titanium dioxide nanoparticles (Ti02) have been used as the photocatalytic center and gold nanoparticles have been attached on Ti02 to make a nanocomposite. According to the findings, gold nanoparticles play a vital role in enhancing the photocatalytic activity of Ti02, by facilitating the charge separation. Further, the photocatalytic activity also can be tuned …
A Design Science Based Evaluation Framework For Patterns,
2010
University of Nebraska at Omaha
A Design Science Based Evaluation Framework For Patterns, Stacie Clarke Petter, Deepak Khazanchi, John D. Murphy
Information Systems and Quantitative Analysis Faculty Publications
Patterns were originally developed in the field of architecture as a mechanism for communicating good solutions to recurring classes of problems. Since then, many researchers and practitioners have created patterns to describe effective solutions to problems associated with disparate areas such as virtual project management, human-computer interaction, software development and engineering, and design science research. We believe that the development of patterns is a design science activity in which an artifact (i.e., a pattern) is created to communicate about and improve upon the current state-of-practice. Design science research has two critical components, creation and evaluation of an artifact. While many …
Acyl-Chain Mismatch Driven Superlattice Arrangements In Dppc/Dlpc/Cholesterol Bilayers,
2010
Trinity University
Acyl-Chain Mismatch Driven Superlattice Arrangements In Dppc/Dlpc/Cholesterol Bilayers, Brian Cannon, Anthony Lewis, Pentti Somerharju, Jorma Virtanen, Juyang Huang, Kwan H. Cheng
Physics and Astronomy Faculty Research
Fluorescence and infrared spectroscopy and cholesterol oxidase activity were employed to investigate the effect of phosphatidylcholine (PC) acyl chain length mismatch on the lateral organizations of lipids in liquid-ordered dipalmitoyl-PC/dilauroyl-PC/cholesterol (DPPC/DLPC/CHOL) bilayers. Plots of steady-state fluorescence emission anisotropy of diphenylhexatriene (DPH) labeled PC (DPH-PC) embedded in the DPPC/DLPC/CHOL bilayers revealed significant peaks at several DPPC mole fractions (YDPPC) when the cholesterol mole fraction (XCHOL) was fixed to particular values. Analogously, the DPH-PC anisotropy peaked at several critical XCHOL’s when YDPPC was fixed. Acyl chain C−H and C═O vibrational peak frequencies of …
Towards Secure And Scalable Tag Search Approaches For Current And Next Generation Rfid Systems,
2010
Marquette University
Towards Secure And Scalable Tag Search Approaches For Current And Next Generation Rfid Systems, Farzana Rahman
Master's Theses (2009 -)
The technology behind Radio Frequency Identification (RFID) has been around for a while, but dropping tag prices and standardization efforts are finally facilitating the expansion of RFID systems. The massive adoption of this technology is taking us closer to the well known ubiquitous computing scenarios. However, the widespread deployment of RFID technology also gives rise to significant user security issues. One possible solution to these challenges is the use of secure authentication protocols to protect RFID communications. A natural extension of RFID authentication is RFID tag searching, where a reader needs to search for a particular RFID tag out of …
A Diagnostic Examination Of Consecutive Extreme Cool-Season Precipitation Events At St. John's, Newfoundland, In December 2008,
2010
McGill University
A Diagnostic Examination Of Consecutive Extreme Cool-Season Precipitation Events At St. John's, Newfoundland, In December 2008, Shawn M. Milrad, Eyad H. Atallah, John R. Gyakum
Publications
St. John’s, Newfoundland, Canada (CYYT), is frequently affected by extreme precipitation events, particularly in the cool season (October–April). Previous work classified precipitation events at CYYT into categories by precipitation amount and a manual synoptic typing was performed on the 50 median extreme precipitation events, using two separate methods. Here, consecutive extreme precipitation events in December 2008 are analyzed. These events occurred over a 6-day period and produced over 125 mm of precipitation at CYYT. The first manual typing method, using a backward-trajectory analysis, results in both events being classified as “southwest,” which were previously defined as the majority of the …
Doping Dependence Of Spin-Lattice Coupling And Two-Dimensional Ordering In Multiferroic Hexagonal Y₁₋ₓluₓmno₃ (0 ≤ X ≤ 1),
2010
Missouri University of Science and Technology
Doping Dependence Of Spin-Lattice Coupling And Two-Dimensional Ordering In Multiferroic Hexagonal Y₁₋ₓluₓmno₃ (0 ≤ X ≤ 1), Junghwan Park, Seongsu Lee, Misun Kang, Kwanghyun Jang, Changhee Lee, Sergey V. Streltsov, Vladimir V. Mazurenko, Maria V. Valentyuk, Julia E. Medvedeva, Takashi Kamiyama, Jegeun Park
Physics Faculty Research & Creative Works
We have examined a complete phase diagram of Y1-x Lu xMnO3 with 0≤x≤1 by using bulk measurements and neutron-diffraction studies. With increasing Lu concentration, Curie-Weiss temperature and Neel temperature are found to increase continuously while the two-dimensional nature of short-range magnetic correlation persists even in the paramagnetic phase throughout the entire doping range. At the same time, the lattice constants and the unit-cell volume get contracted with Lu doping, i.e., chemical pressure effect. This decrease in the lattice constants and the unit-cell volume then leads naturally to an increased magnetic exchange interaction as found in our local …
Simulation Of Contaminant Transport From Solid Domestic Waste Disposal Sites In The Warri Deltaic Plain Sands, Warri-Effurun, Nigeria,
2010
Montclair State University
Simulation Of Contaminant Transport From Solid Domestic Waste Disposal Sites In The Warri Deltaic Plain Sands, Warri-Effurun, Nigeria, Charles Onoriode Usiaphre
Theses, Dissertations and Culminating Projects
Protecting the groundwater resource in the Warri Deltaic Plain sand from the impact of anthropogenic contamination requires an understanding and knowledge of groundwater flow paths, transport processes and the source of contamination. This study was carried out to find out contaminant transport from solid domestic waste sites to the groundwater. The U.S. Geological Survey three-dimensional finite-difference code, MODFLOW, was used to simulate the groundwater flow. The flow pattern reveals predominantly downward flow, with major horizontal motion towards towns around Ekurede Urhobo and Ekurede Itsekiri in Warri. Simulation of advective contaminant transport using MODPATE1 for particle tracking indicates local movement of …
Wind Speed Dependence Of Single-Site Wave-Height Retrievals From High-Frequency Radars,
2010
University of Miami
Wind Speed Dependence Of Single-Site Wave-Height Retrievals From High-Frequency Radars, Brian K. Haus, Lynn K. Shay, Paul A. Work, George Voulgaris, Rafael J. Ramos, Jorge Martinez-Pedraja
Faculty Publications
Wave-height observations derived from single-site high-frequency (HF) radar backscattered Doppler spectra are generally recognized to be less accurate than overlapping radar techniques but can provide significantly larger sampling regions. The larger available wave-sampling region may have important implications for observing system design. Comparison of HF radar–derived wave heights with acoustic Doppler profiler and buoy data revealed that the scale separation between the Bragg scattering waves and the peak energy-containing waves may contribute to errors in the single-site estimates in light-to-moderate winds. A wave-height correction factor was developed that explicitly considers this scale separation and eliminates the trend of increasing errors …
Temporal And Spatial Monitoring Of Mobile Nanoparticles In A Vineyard Soil: Evidence Of Nanoaggregate Formation,
2010
Centre de Géochimie de la Surface UMR 7517
Temporal And Spatial Monitoring Of Mobile Nanoparticles In A Vineyard Soil: Evidence Of Nanoaggregate Formation, N. Perdrial, J. N. Perdrial, J. E. Delphin, F. Elsass, N. Liewig
College of Arts and Sciences Faculty Publications
Mechanisms of formation, stabilization, liberation, transport and deposition of nanoparticles and their relationship to contaminant transport remain scarcely investigated in natural porous media. This study investigated nanoparticles mobilized in the pore space of a French vineyard soil by observing mobile soil-derived organic matter (SOM) and minerals in pore fluids over an 8-month monitoring period. Samples were collected in situ and investigated by transmission electron microscopy coupled to electron-dispersive spectroscopy. The main types of nanoparticles transported within the soil were clay, bacteria, SOM and nanoaggregates. Nanometric clay particles were enriched in various metals (Fe, Zn, As and Pb) and organically-derived constituents. …
Investigating Capabilities Associated With Ict Access And Use In Latino Micro-Enterprises,
2010
University of Nebraska at Omaha
Investigating Capabilities Associated With Ict Access And Use In Latino Micro-Enterprises, Travis Good, Luis Flores Morales, Sajda Qureshi
Information Systems and Quantitative Analysis Faculty Proceedings & Presentations
While the process by which Information Technology enables growth in medium and large enterprises has been wellresearched, the corresponding processes in micro-enterprises are poorly understood. In fact, such micro-enterprises lie at the heart of many economies. This insight is important as information technology enables businesses to connect with each other through knowledge networking to carry out their basic business operations. There is thus a need to build our understanding of how micro-enterprises access and use technology in order to be able to assess the benefits they derive from ICT adoption. Following an analysis of two case studies of Latino micro-enterprises …
