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Investigation Of Oxy-Anion Legand Adsorption Onto Surfaces Of Iron Oxide And Bacteria In Groundwater Aquifers, Haile Mengistu

Dissertations

We have measured adsorption of dissolved phosphate onto synthetic hydrous ferric oxide (HFO), dissolved arsenate and chromate onto the cell membrane of a bacterium species, S. putrefaciens as a function of pH, ionic strength, and relative concentrations of the respective oxy-ligands. Our experimental data were used to constrain optimal values for surface complexation reactions involving dissolved oxi-ligands (phosphate, and chromate) and the HFO surface and the cell membrane of S. putrefaciens respectively according to the diffuse layer model.

Our results provide a more accurate fit to experimental measurements over a broader range of pH (3 - 12), ionic strength and …

Pages News, Volume 14, No. 3, December 2006, Irka Hajdas, Christoph Kull, Thorsten Kiefer

PAGES

Contents: Editorial: 14C-Chronology -- PAGES calendar -- Inside PAGES -- New on the PAGES bookshelf -- Program News -- The Millennium project: European climate of the last millennium -- Paleoenvironments in south India: Monsoon records from rainfed reservoirs -- Science Highlights: 14C - Chronology -- Cosmogenic isotope 14C: Production and carbon cycle -- Assuring measurement quality: The international 14C laboratory inter-comparison -- IntCal and the future of radiocarbon calibration --- The potential for extending Intcal04 using OIS-3 New Zealand sub-fossil Kauri -- Marine reservoir corrections and the calibration curve -- New approaches to constructing age models:OxCal4 -- 21st century suck-in …

Board Of Regents' Meeting At Pvamu, George C. Wright

President Emeritus George C. Wright Speeches

No abstract provided.

Coupling Of Fluid & Solid Thermal Models To Correct Heat Flux Measurements Taken On Launch Vehicles, Danielle M. Ford

Master's Theses - Daytona Beach

Knowledge of aerothermally induced convective heat transfer and plume induced radiative heat transfer loads is essential to the design of thermal protection systems (TPS) for launch vehicles. These loads are measured via the cylindrical heat flux gauges that are flush mounted with the outer surface of a launch vehicle and are exposed to the in-flight external thermal and velocity boundary layers as well as thermal radiation. Typically, Schmidt-Boelter gauges measure the incident heat flux based on the one-Dimensional Fourier's law. This instrumentation, when surrounded by low-conductivity insulation, has an exposed surface temperature significantly lower than the insulation. A substantial disturbance …

Neural Network Burst Pressure Prediction In Composite Overwrapped Pressure Vessels From Acoustic Emission Data, Seth-Andrew T. Dion

Master's Theses - Daytona Beach

Composites have grown in importance in the aerospace industry where high specific strength is a priority. Weight reduction in space vehicles is critical because of the exorbitant cost associated with placing objects into space. Major weight savings have been obtained by switching from all metal pressure vessels to composite overwrapped pressure vessels (COPVs). Due to the nature of composites, current nondestructive analysis procedures for COPVs are not adequate for assessing structural integrity. As such, new methods must be developed. Presented herein is one such method.

A method for burst pressure prediction using parametric filtering of acoustic emission (AE) data along …

Campus Report, Vol. 34, No. 4, University Of Dayton

Campus Report

Facebook fallout: A study by UD researchers uncovers the different perceptions students and their potential employers have of the popular social networking site.

Monthly Accomplishments For Turnbull National Refuge, December 2006, Turnbull National Wildlife Refuge

Turnbull National Wildlife Refuge Reports

A monthly report of accomplishments at Turnbull National Wildlife Refuge written by Project Leader Nancy Curry.

Optimization Of The Tool Path In A Robotic Environment, Mukund Venkatachari Narasimhan

Mechanical and Aerospace Engineering Dissertations - Archive

The rising costs and demand coupled with shrinking energy generating resources has triggered the need for optimum use of energy resources, minimizing the overhead costs and maximizing the profits. Robots have been long touted as a fit replacement of human labor force in manufacturing sectors. Slowly there is increased presence of robots in automobile and electronic industries. Typically they are used for welding, painting, ironing, assembly, pick and place, inspection, and testing. Mass production, fulfilling the ever increasing demand, can be accomplished by robots because of their precision, speed of operation and high endurance capabilities. This dissertation comprises of two …

Analysis Of Hat Sectioned Reinforced Composite Beams Including Thermal Effects, Kashif Ali Nayyer Syed

Civil Engineering Dissertations - Archive

A simple analytical method for analyzing fiber reinforced polymeric composite beams with hat cross-section is presented. The method includes development of closed-form expression of the axial, bending and their coupling stiffness matrices for the composite beams. The stiffness matrices are obtained by transforming the actual geometrical cross-section of the beam into an equivalent plate using transformation matrices and Parallel Axis theorem. Ply stresses due to mechanical as well as thermal load can easily be obtained at any given location of the beam section. In this approach, the effect of induced in-plane deformation due to bending for an unsymmetrical cross-section is …

Generation Planning And Market Operation Strategies In The Southwest Power Pool Energy Imbalance Service Market, Kittipong Methaprayoon

Electrical Engineering Dissertations - Archive

The transition of the Southwest Power Pool (SPP) from its traditional operation under tariff towards the new market environment has significant impact on the utilities in the SPP footprint, both in terms of planning and operations. The new market regulation creates the need for the utilities to reassess their planning strategy, primarily to ensure that operational decisions conform to the new market rules while remain profitable under the new operating regime. The utilities are referred to as Market Participants (MP) under the new market scheme. The new market environment will expose the MPs to a large amount of information with …

Fiber Optic Scanner Using Electromagnetic Actuation With Different Ferromagnetic Materials, Pratibha C. Phuyal

Electrical Engineering Theses - Archive

A fiber optic scanner capable of scanning medical imaging actuated by an external magnetic field is designed and characterized using different magnetized and non magnetized ferromagnetic materials. Cobalt, Iron, Nickel, and Samarium Cobalt powders were used before and after magnetization to perform the actuation. Plastic optical fiber and a silica optical fiber are coated with 70 % enamel paint with 30 % different ferromagnetic materials mixed using brush. Due the low Young's Modulus, the plastic optical fiber could not actuate like silica optical fiber. Therefore, the silica fiber was used to conduct the experiments. The static and dynamic measurements were …

Miniature Optical Coherence Tomography Probe, Asif Rizwan

Bioengineering Theses - Archive

A piezo based optical scanner for high speed optical coherence tomography (OCT) has been developed. Design of the miniature probe has been optimized to take advantages of the high speed depth scanning that can be achieved with spectral domain OCT (SD-OCT) systems. Three prototype scanning probes were constructed and tested for OCT imaging. Movies and images of tissues are presented which were taken at frame rates ranging from 50~100fps. Data were acquired at 18000 A-lines per second at an effective integration time of 55us.

Optical Coherence Tomography Of Oral Mucosa, Nidhi Bharatbhai Mehta

Bioengineering Theses - Archive

Oral cancer causes 120000* deaths annually around the world and 280000* new cases are diagnosed every year. Technology has developed and the death rate of oral cancer has improved over the last few decades; hence to improve the survival rate, development of a technique able to diagnose carcinomas in its early stages is very important. OCT is a non invasive imaging technique capable to provide high resolution microstructure images of tissue. A development of in vivo OCT; capable to image tissue with micrometer resolution and able to identify pre cancerous morphological changes non invasively could improve survival rate in cancer …

Finite Element Modeling Of Carbon Nanotube Reinforced Polymer Composites And Evaluating Its Thermal Conductivities, Raghuram Basavanahalli

Mechanical and Aerospace Engineering Theses - Archive

High thermal conductivity of carbon nanotubes has motivated us to study and understand the thermal mechanisms in nanocomposites. Though several theoretical models predict a high thermal conductivity for CNT reinforced polymer composites, the experimental validation are not so encouraging. A finite element model of MWNT reinforced nanocomposite is developed based on continuum mechanics approach. The finite element model is a representative volume element (RVE) with single MWNT inclusion. The inclusion is modeled based on the continuum model of MWNT as effective solid fiber [22].The interface resistance between the nanotube and the matrix material is modeled using thermal contact elements. The …

Structural Analysis Of Fiber Reinforced Composite Materials, Cesar Augusto Rojas

Mechanical and Aerospace Engineering Theses - Archive

A study of fiber reinforced composite structures is conducted .This study includes laminate analysis, analysis of laminated composite beams and parametric study of composite beams. Finite element analysis for each beam model is conducted to verify the results obtained by analytical model. The analysis of the laminated beams in this study covers: 1. beam with a solid rectangular cross-section subjected to a transverse load 2. beam with a I-section under bending 3. beam with a squared tubular section under bending 4. beam with truss section under bending One of the principal purposes of this thesis is to create a user …

Investigation On The Mechanism Of Interface Electromigration (Em) In Copper (Cu) Thin Films, Jee Yong Kim

Material Science and Engineering Dissertations - Archive

This study concerns the mechanism of the interface electromigration (EM) in copper (Cu) thin films. While EM in Cu is one of the most concerned reliability failure phenomena in Cu interconnects used microelectronic devices, its mechanism is not well understood yet. In order for better understanding of the EM mechanism, this study attempt to investigate the interface EM mechanism by examining the passivation effects on Cu EM using a cross-strip structure where Cu lines are cross-stripped with different passivation layers. From the observation of the marker polarity (hillocks and voids), the interface EM mechanism is determined whether the passivation layer …

Acknowledgements, The Mcnair Team

McNair Scholars Research Journal

No abstract provided.

Trends Of Vehicular Emissions Due To The Effect Of Ethos® Fr As Fuel Additive, Shruthi Satyanarayan

Civil Engineering Theses - Archive

The main objective of this research was to observe if the addition of the fuel additive Ethos Fuel Reformulator significantly reduced the emissions of CO, CO2, HC and NOX from a light duty vehicle. Data collection was carried out before and after the application of Ethos FR for both Peak and Off-peak traffic conditions, on highway as well as arterial test track. The OBS-1300 analyzed second by second concentrations of the tailpipe emissions. Data analysis was conducted and the following results were observed. 1. There was a significant reduction in NOx Emissions, with the maximum of 45% in the Arterial …

Mix Design For A Concrete Canoe, Ryan Thomas Christensen

Undergraduate Honors Capstone Projects

Each year the American Society of Civil Engineers sponsors a concrete canoe competition. This paper details the work performed by Ryan Christensen for the 2006 concrete canoe competition. His primary focus was on formulating a concrete mix to be used for the Utah State University canoe. Basic information regarding the building and design of concrete canoes is also presented. Finally, general competition results for 2006 are presented for the Utah State University canoe team.

"A Lean Accounting Curriculum", Jake Lewis

Undergraduate Honors Capstone Projects

This paper is written as a part of my honors thesis. My objective for my thesis was to develop a curriculum to be used in the classroom here at Utah State University, on the subject of lean accounting. This curriculum includes a set of lecture slides, selection of an assigned textbook, a case study assignment, and a DVD. Also compiled were several other optional materials that may be used as supplements to the aforementioned set of materials or as a means to briefly cover lean accounting in another course if so desired. This paper contains a brief summary of lean …

Geomorphic Considerations For Restoration Of Headwater Streams Impacted By Mountaintop Mining Hollow Fills., Ben Mater 1982-

Electronic Theses and Dissertations

Within the Appalachian hills of eastern Kentucky, large-scale coal mining operations are directly altering the headwater landscape through the construction of hollow fills. These man-made landforms and their associated in-stream structures alter a longterm, continuous morphologic evolution driven by the natural interaction of erosive forces and material of the earth's surface. Post-mining channel morphology, hillslopes, and hollow fills continue to actively evolve in response to erosive forces. Aquatic ecosystem functionality and hollow fill stability may be jeopardized by this condition, yet they may be preserved through efforts to restore or re-create channel morphology more representative of the natural headwater stream. …

Mobility-Based Predictive Call Admission Control And Resource Reservation For Next-Generation Mobile Communications Networks., Sherif Said Rashad 1974-

Electronic Theses and Dissertations

Recently, the need for wireless and mobile communications has grown tremendously and it is expected that the number of users to be supported will increase with high rates in the next few years. Not only the number of users, but also the required bandwidth to support each user is supposed to increase especially with the deploying of the multimedia and the real time applications. This makes the researchers in the filed of mobile and wireless communications more interested in finding efficient solutions to solve the limitations of the available natural radio resources. One of the important things to be considered …

A Robotics Testbed : The Design & Implementation With Applications., Travis Alan Riggs

Electronic Theses and Dissertations

In order to study the movements of autonomous mobile robots, a tool is needed to quantify those movements. A testbed is an apparatus that provides a designated space for multiple mobile robots while tracking their position in real-time. That tracking information can also be communicated to the robots themselves to serve as closed-loop feedback. With this tool, many techniques can be developed and validated through various control experiments. A design and implementation of a testbed is presented here. The testbed is analyzed for its performance and several applications are presented to demonstrate its usefulness.

Design Of An Interface For A Decision Support System For Dairy Collection., Charles Milan Braidich 1983-

Electronic Theses and Dissertations

A decision support system (DSS) is a computer-based tool that extends an operator's cognitive abilities and makes him more effective in decision-making situations. This thesis discusses the characteristics and historical applications of decision support systems. It also discusses the contexts, operator requirements, and policies surrounding a SS for dairy security; in this instance security includes both the physical security of the product and the integrity of the data concerning the product. Finally, this thesis discusses the methodology and resulting design of the DSS for dairy security. Specific tools and considerations involved in the design include the human centered design cycle …

Service-Learning Outcomes At A Faith-Based Institution Of Higher Education., Amy L. Doolittle

Electronic Theses and Dissertations

This quantitative dissertation examines outcomes of a required service-learning program at a faith-based institution. Two hundred and ten students completed a pre/post survey administered to a sophomore level class about background, educational processes, and twelve attitude and knowledge subscales related to service-learning. All subscales met standard reliability standards. Two dependent variables were used to measure critical thinking and students' perceptions of learning. While students entered the class with strong positive attitudes and knowledge on most subscales, four subscales Civic Attitudes, Civic Behavior, Civic Action, and Social Justice showed significant positive changes, and two subscales Motivation for Service and Personal Enrichment …

Analysis Of Nmr Spectra Using Digital Signal Processing Techniques., Jason Aaron Gearheart

Electronic Theses and Dissertations

Since its development, nuclear magnetic resonance (NMR) has become one of the primary methods of chemists for structure elucidation, which is the determination of a compound's molecular structure. Current software packages enable scientists to visualize the raw data produced by the spectrometer so that they can manually determine a compound's component parts. This is accomplished by manually comparing the spectrum of the mixture with various reference materials believed to be present. But these software packages can be expanded to do even more. It is the purpose of this thesis to provide an automated analysis package capable of analyzing a mixture …

Animal Experiment (Rabbit) To Demonstrate Changes In Trabecular Bone Mechanical Properties Over Time Using Finite Element Analysis., Shuo Yang 1974-

Electronic Theses and Dissertations

Decreased strength of trabecular bone is a direct effect of osteoporosis, which can be evaluated by finite element analysis. However, computational limitations have restricted previous trabecular bone analyses primarily to the linear domain. In addition, previous work was largely invasive and the corresponding finite element models were typically homogeneous. Nonlinear heterogeneous finite element analysis was used to calculate trabecular bone apparent strength directly from in vivo micro computational tomography (micro-CT) scans. Through a series of validation experiments, it was shown that this nonlinear modeling is more accurate in evaluating trabecular bone mechanics in osteoporosis than previous work. A parameter driven …

Incomplete Compensation And Migration Behavior: Has Anything Changed Between 1990 And 2000?, William E. Herrin, David E. Clark, Thomas Knapp, Nancy White

School of International Studies Faculty Articles

Spatial equilibrium models rely on migration to arbitrage away differences in utility across locations net of moving costs, where remaining differences in wages and rents reflect the compensating differentials related to site-specific amenities. Recent refinements to the spatial equilibrium model focus upon the prospect of disequilibrium in amenity markets. Amenity market disequilibrium implies over- or undercompensation (incomplete compensation) across some locations, which suggests a role for these factors in subsequent migration. This paper follows the theoretical and empirical approach of Clark, Herrin, Knapp, and White (2003). An intercity wage regression is estimated where fixed effects capture the impact of site …

The Development Of A Design Ontology For Products And Processes, Md Baniamin Sarder

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

This research develops a methodology called, Design Knowledge Acquisition Process (DKAP) for creating ontology of product and process design using IDEF5 and to develop a consistency matrix for checking accuracy of captured information. It constructs an ontology of a generic product and process design using the developed DKAP methodology. Designing products and processes is very challenging and vital for manufacturing enterprises to stay in the competitive market. Manufacturers want to launch their products in the market as quickly as possible while satisfying their customers in terms of quality, cost and delivery. In order to lunch the products early and/or to …

Convex Versions Of Multivariate Adaptive Regression Splines And Implementations For Complex Optimization Problems, Dachuan Thomas Shih

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Multivariate Adaptive Regression Splines (MARS) provide a flexible statistical modeling method that employs forward and backward search algorithms to identify the combination of basis functions that best fits the data. In optimization, MARS has been used successfully to estimate the value function in stochastic dynamic programming, and MARS could be potentially useful in many real world optimization problems where objective (or other) functions need to be estimated from data, such as in simulation optimization. Many optimization methods depend on convexity, but a nonconvex MARS approximation is inherently possible because interaction terms are products of univariate terms. In this dissertation, convex …