Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Modeling (3)
- Cave (2)
- Chondrogenesis (2)
- Coalescence (2)
- Distributed Generation (2)
-
- Fermentation (2)
- GIS (2)
- Geology (2)
- Information Theory (2)
- Karst (2)
- Microcrack (2)
- Paleoclimate (2)
- Professional development (2)
- Scattering (2)
- Silicon Carbide (2)
- Simulation (2)
- Synthesis gas (2)
- Transportation (2)
- Wavelets (2)
- AMR (1)
- AO (1)
- APA (1)
- Acetic acid (1)
- Actin cytoskeleton filaments (1)
- Active power filter (1)
- Adaptive Solution (1)
- Adhesive bond (1)
- Adsorption (1)
- Adult and continuing education (1)
- Advanced Life Support (1)
Articles 1 - 30 of 88
Full-Text Articles in Entire DC Network
The Creation Of Boron Deep Levels By High Temperature Annealing Of 4h-Sic, Hrishikesh Das
The Creation Of Boron Deep Levels By High Temperature Annealing Of 4h-Sic, Hrishikesh Das
Theses and Dissertations
Creation of semi-insulating layers in SiC is highly desirable for high voltage device fabrication. Specifically PiN diodes can be fabricated with a compensated semi-insulating layer that would be capable of blocking a large reverse voltage. Semi-insulating (SI) behavior in SiC has been traditionally achieved via passivation of shallow dopants with vanadium-related deep levels. Degraded electrical properties of SiC devices result from the use of vanadium compensated SiC because unintentional formation of additional defects due to vanadium segregation and stress generation in the material occur. In this work, the possibility of low doped or SI epilayers via engineering of the boron …
Gml Represntation For Interoperable Spatial Data Exchange In A Mobile Mapping Application, Venu Madhav Singh Kanaparthy
Gml Represntation For Interoperable Spatial Data Exchange In A Mobile Mapping Application, Venu Madhav Singh Kanaparthy
Theses and Dissertations
Geographic information is critical to GIS applications located remotely for executing business operations. GIS applications need to interoperate to be able to share information for analysis and decision making process. Heterogeneity and complexity of information models and structures limit the data flow and application interoperation. Advancements in Internet technologies provided new opportunities for delivering spatial information to remote users. However, spatial data delivered is in proprietary structures, limiting the utility to GIS applications. To enable information flow between GIS applications a portable data modeling approach is necessary. However, geographic information is inherently complex to model. A comprehensive and standardized vocabulary …
Ecological And Genetic Consequences Of Seasonal Drought On Stream Communities Inhabiting Pool Refugia, Joseph William Love
Ecological And Genetic Consequences Of Seasonal Drought On Stream Communities Inhabiting Pool Refugia, Joseph William Love
Theses and Dissertations
In intermittent streams, hydrological variation is probably the single-most important factor affecting fish assemblage structure. While the response of aquatic assemblages to seasonal or annual variation in hydrology is well-known, less attention has been devoted to how assemblages respond to natural, intraseasonal drought. To explore this question, I conducted summer surveys of fish and aquatic insect assemblages occupying pool refugia in first to third order, intermittent streams in the Saline river drainage in the Ouachita highlands (central Arkansas, U.S.A.)(2001?2003). The goals of this project were: 1) to relate assemblage variability of fishes and aquatic insects to environmental gradients during summer …
Improved Estimation Of Epitaxial Thin Film Thickness And Doping Using Fourier Transform Infrared Reflection Spectroscopy, Swapna Geetha Sunkari
Improved Estimation Of Epitaxial Thin Film Thickness And Doping Using Fourier Transform Infrared Reflection Spectroscopy, Swapna Geetha Sunkari
Theses and Dissertations
Film thickness, free carrier concentration and free carrier mobility are critical figures of merit for silicon carbide epitaxial growth. Room temperature Fourier Transform Infrared (FTIR) reflection spectroscopy can estimate these parameters non-destructively and is capable of high-resolution wafer mapping. Commercially available equipment has greatly simplified the application of this technique by coupling a high performance automated spectrometer with model-based data analysis and interpretation based on the personal computer. While powerful numerical techniques run fast and efficient on modern computers, it is essential that low-order, well-conditioned models are needed. The observed reflectance spectrum is the result of reflection and refraction of …
Predicting Open-Source Software Quality Using Statistical And Machine Learning Techniques, Amit Ashok Phadke
Predicting Open-Source Software Quality Using Statistical And Machine Learning Techniques, Amit Ashok Phadke
Theses and Dissertations
Developing high quality software is the goal of every software development organization. Software quality models are commonly used to assess and improve the software quality. These models, based on the past releases of the system, can be used to identify the fault-prone modules for the next release. This information is useful to the open-source software community, including both developers and users. Developers can use this information to clean or rebuild the faulty modules thus enhancing the system. The users of the software system can make informed decisions about the quality of the product. This thesis builds quality models using logistic …
Imposing Cyclic Strain On Osteogenic Stem Cells: The Effects Of Strain Levels And Repetition Of Cyclic Strain In An Implant Environment, Daniel Henlee Smith
Imposing Cyclic Strain On Osteogenic Stem Cells: The Effects Of Strain Levels And Repetition Of Cyclic Strain In An Implant Environment, Daniel Henlee Smith
Theses and Dissertations
Bone and bone cells have been shown to respond to mechanical forces placed upon them. Particularly, strain plays an important role in osteogenic differentiation of marrow cells around artificial implants in bone. These strains, depending on their magnitude, duration, and repetition, can alter the proliferation and matrix synthesis of osteoblasts. To test how strain parameters influence osteoblast behavior, a four-point bending apparatus was used to impose cyclic strain on osteogenic stem cells isolated from rats and seeded on titanium plates. Cells were stimulated at 1 Hz for 15 minutes daily and compared to an unstrained control. Stimulation occurred at two …
Laboratory Evaluation Of Tensile And Shear Strengths Of Asphalt Tack Coats, Mark Everett Woods
Laboratory Evaluation Of Tensile And Shear Strengths Of Asphalt Tack Coats, Mark Everett Woods
Theses and Dissertations
Asphalt tack coats are applied during pavement construction to ensure bond between pavement layers, thus providing a more durable pavement. A prototype tack coat evaluation device (TCED) was developed to evaluate the tensile and torque-shear strength of tack coat materials. Three emulsions (SS-1, CSS-1, and CRS-2) and one asphalt binder (PG 67-22), commonly used as tack coats, were evaluated using the TCED at various application temperatures, application rates, dilutions, and set times. A laboratory bond interface strength device (LBISD) was developed to assess interface shear strength of laboratory-prepared specimens. Mass loss testing was performed to evaluate moisture evaporation and visual …
Distributed Generation Impact On Fault Response Of A Distrubution [I.E., Distribution] Network, Venkata Ramanujam Kanduri
Distributed Generation Impact On Fault Response Of A Distrubution [I.E., Distribution] Network, Venkata Ramanujam Kanduri
Theses and Dissertations
Electric power systems are a key infrastructure today. Power systems can be divided into three major parts: generation, transmission, and distribution. Out of these the distribution system is the most complex part and least studied system. In order to have continuous and reliable power to all customers it is necessary to have a good protection system. Major disturbances that are caused and last for a very short duration are called faults. With the advent of distributed generation (DG), the understanding of fault response has become more difficult. This thesis presents the study of the fault response and the factors that …
Hispanic Students' Beliefs Regarding Emergent Literacy: A Case Study, Jacqueline L. Breland Worley
Hispanic Students' Beliefs Regarding Emergent Literacy: A Case Study, Jacqueline L. Breland Worley
Theses and Dissertations
The purpose of this study was to identify the beliefs of the participants with regards to emergent literacy. Another purpose was to identify literacy practices employed by the participants while teaching preschool children. An additional purpose was to determine if participation in the course entitled ?Emergent Literacy? changed any beliefs of the participants regarding emergent literacy and subsequent literacy practices employed while teaching preschool children. The final purpose of this study was to determine the beliefs of the participants regarding emergent literacy and subsequent literacy practices employed while teaching preschool children, three years after completing the course entitled ?Emergent Literacy.? …
Investigation Of Inductively Coupled Plasma As An Atomization Source For Analytical And Fundamental Measurements Using Cavity Ringdown Spectroscopy, Fabio Jerome Mazzotti
Investigation Of Inductively Coupled Plasma As An Atomization Source For Analytical And Fundamental Measurements Using Cavity Ringdown Spectroscopy, Fabio Jerome Mazzotti
Theses and Dissertations
Analytical as well as fundamental measurements were performed with an inductively coupled plasma (ICP) using the novel technique of cavity ringdown spectroscopy. A newly designed ICP torch was presented. Limits of detection were measured for elemental mercury, both in an ICP as well as in a cold mercury chemical generator. The efficiency of the technique was compared with laser-induced fluorescence (LIF) in the ICP. Isotopically resolved spectra of uranium were collected with this technique and results were compared to previous studies using LIF. Gas temperature and electron density estimations were done by lineshape measurements on lead atoms in the ICP. …
Reliability-Based Optimization Of Fiber-Reinforced Polymer Composite Bridge Deck Panels, Michel D. Thompson
Reliability-Based Optimization Of Fiber-Reinforced Polymer Composite Bridge Deck Panels, Michel D. Thompson
Theses and Dissertations
A reliability-based optimization (RBO) methodology was developed and applied to fiber-reinforced polymer (FRP) bridge decks. Commercially available software was used to optimize a FRP bridge deck panel by weight with structural reliability, stress, and deflection constraints. A methodology using optimization software, finite element analysis, and probabilistic analysis software was developed to examine the effects of load and resistance uncertainties in FRP bridge deck optimization. Eight modular deck designs were considered for use in the RBO methodology. Investigations into random variable sensitivities, design variable sensitivities, wheel positions, and buckling were conducted to minimize computational effort. Five models were eventually optimized with …
Theoretical Modeling Approach For A Common Residential Electrically Heated Oven And Proposed Oven Design Modification, Mark Allan Breen
Theoretical Modeling Approach For A Common Residential Electrically Heated Oven And Proposed Oven Design Modification, Mark Allan Breen
Theses and Dissertations
Current research has developed a fully predictive model of an electrically heated common residential oven. This system was modeled using a fully explicit approach and, where applicable, considered natural convective correlations, various radiation networks, and conduction relations. Two oven configurations were modeled, a conventional (unmodified) residential oven and a modified design. By comparing the theoretical results obtained through modeling with experimental results, verification of the modeling assumptions and results has been achieved. This research has produced an analytical design tool for predictive modeling of time dependant surface temperatures, maximum expected temperatures, and the baking performance of various oven designs. Thus …
Towards A Methodology For Interactive Virtual Design Assessment, Kang Li
Towards A Methodology For Interactive Virtual Design Assessment, Kang Li
Theses and Dissertations
Complex interactive behaviour involves cognitive, sensation and motor behaviour and may consist of several sub interactive behaviours. It needs to be examined from different points of view. Although explaining everything in one model is not currently possible, it is possible to connect information from different sources to get a better understanding of the interaction to benefit product design. The long-term objective of our study is to develop a methodology for interactive virtual design assessment to study the interactive behaviour and achieve compatibility. This study summarized two experiments which covered many aspects of interactive behaviours in seated posture. Experiment one addressed …
A Sliding Interface Method For Unsteady Unstructured Parallel Flow Simulations, Eric Lindsay Blades
A Sliding Interface Method For Unsteady Unstructured Parallel Flow Simulations, Eric Lindsay Blades
Theses and Dissertations
The primary objective of this study is to develop a sliding interface method for simulations involving relative rotational grid motion suitable for unstructured grid topologies. The present method alleviates computationally expensive grid deformation, remeshing, and hole cutting procedures. Rotational motion is accomplished by rigidly rotating a subdomain representing the moving component. At the subdomain interface boundary, the faces along the interfaces are extruded into the adjacent subdomain to create new volume elements and provide a one-cell overlap. These new volume elements close the control volumes for the nodes on the interface surface and allow a flux to be computed across …
An Architecture Design For A Real-Time Web-Based Visualization In The Grid Environment, Bhargavi Sura
An Architecture Design For A Real-Time Web-Based Visualization In The Grid Environment, Bhargavi Sura
Theses and Dissertations
Situations like war, terrorist attacks, fire accidents, floods, storms, etc., which threaten human life and property, demand immediate action to decrease the damage caused by them. A system is needed that predicts the future events based on what has happened and notifies the concerned personnel. The situation could be better understood in less time if the data is represented as colored, shaded and moving images rather than as numbers. Such a system requires a real-time Web-based visualization system with easy and secure access to grid resources, presenting easy-to-read graphics through a simple interface provided by a Web browser, and responding …
Multiscale Analysis Of Void Coalescence In Ductile Metals, Matthew Kenneth Jones
Multiscale Analysis Of Void Coalescence In Ductile Metals, Matthew Kenneth Jones
Theses and Dissertations
A mulitscale approach is used to model the coalescence of voids. At the microscale, cylindrical and spherical voids in nickel and the magnesium alloy AM60 are simulated through finite element analyses. The nickel cylindrical void simulations are compared to a set of experiments to validate this micromechanical finite element approach used to study void coalescence. At the macroscale, the coalescence portion of a microstructure-property material model is modified to reflect the behavior of three-dimensional spherical voids using results from the micromechanical simulations. An analysis of an automotive component illustrates the influence of void coalescence at the structural scale.
An Investigation Of Host Site Participants' Perceptions Of A Shared Distance Learning Experience, Debra Lynn Williams-Carter
An Investigation Of Host Site Participants' Perceptions Of A Shared Distance Learning Experience, Debra Lynn Williams-Carter
Theses and Dissertations
The purpose of this study was to investigate host site participants' perceptions of a shared distance learning experience. The participants for the study were 12 students enrolled in the course, Teaching Strategies in Elementary Education at Hunt University during the fall semester of 2000. The course was offered simultaneously to students at a distance site. Both groups of students received instruction from the same instructor during the course. According to the review of the literature numerous studies have been conducted to obtain data from the perspectives of distance site students. However, no literature was found that pertained specifically to the …
Site-Specific Prediction And Measurement Of Cotton Fiber Quality, Rui Wang
Site-Specific Prediction And Measurement Of Cotton Fiber Quality, Rui Wang
Theses and Dissertations
Maintaining cotton fiber quality is crucial for the survival of the U.S. cotton industry. Previous studies have indicated that spatial variability of fiber quality parameters exists in cotton fields. If site-specific measurement and prediction of quality is possible, then fiber could be segregated during the harvesting process, thus increasing the overall price a producer would receive for his crop. Because of the importance of fiber micronaire to the textile industry, the fact that micronaire exhibits moderate variation in the field, and the fact that it has been shown to be related to optical properties of cotton fibers, micronaire measurement was …
Development Of A Distributed Model For The Biological Water Processor Of The Water Recovery System For Nasa Advanced Life Support Program, Sachin Vishwas Puranik
Development Of A Distributed Model For The Biological Water Processor Of The Water Recovery System For Nasa Advanced Life Support Program, Sachin Vishwas Puranik
Theses and Dissertations
The Water Recovery System (WRS) is one of the necessary subsystems in an Advanced Life Support program. It regenerates potable water by processing wastewater generated on a space shuttle or on a space station. The Biological Water Processor (BWP) is one of the complex subsections of WRS that involves processes described by continuous time as well as discrete event dynamics. Such systems can be modeled as hybrid dynamical systems in MATLAB/Stateflow. The following state variables of the BWP have been simulated in MATLAB: Pressure drop across Organic Carbon Oxidation Reactor (OCOR), Pressure drop across nitrification reactor, nitrifier flow rate, total …
Microbially Mediated Porosity Enhancement In Carbonate Reservoirs: Experiments With Samples From The Salem, Sligo, And Smackover Formations, Melody Roy Coffey
Microbially Mediated Porosity Enhancement In Carbonate Reservoirs: Experiments With Samples From The Salem, Sligo, And Smackover Formations, Melody Roy Coffey
Theses and Dissertations
This study used petrographic thin sections, scanning electron microscopy, and confocal laser microscopy to document microbially mediated dissolution of carbonate reservoir rocks. The samples studied came from three carbonate units that are hydrocarbon reservoirs; the Salem, Sligo, and Smackover formations. These samples were inoculated with bacteria, and then treated with nutrient solutions followed by ethanol to promote generation of acetic acid by bacteria. Dissolution occurred in calcite-dominated rocks and in dolomitized rocks. Noticeable changes first occurred after nine weeks of ethanol treatment and significant change only occurred after twelve weeks of ethanol treatment. The size of the vuggy pores created …
Investigation Of Order Parameters And Critical Coupling For The Peierls Extended Hubbard Model At One-Quarter Filling, Rahul Padmakar Hardikar
Investigation Of Order Parameters And Critical Coupling For The Peierls Extended Hubbard Model At One-Quarter Filling, Rahul Padmakar Hardikar
Theses and Dissertations
The determination of the phase boundary between the charge density wave and the Luttinger Liquid phase for the one-dimensional Peierls extended Hubbard model is done using Stochastic Series Expansion and comparison is done with the phase boundary for the Extended Hubbard model. The result of adding an electron-phonon interaction is that the charge density wave phase weakens. par The energy autocorrelation time is reported for the Extended Hubbard Model and the Peierls Hubbard Model. For coupling near and above the critical coupling the autocorrelation time increases exponentially. par Also investigated is the presence of a spin gap and the critical …
Visualization Of Computer-Modeled Forests For Forest Management, Mahnas Jean Mohammadi-Aragh
Visualization Of Computer-Modeled Forests For Forest Management, Mahnas Jean Mohammadi-Aragh
Theses and Dissertations
Forest management is a costly and time-consuming activity. Remote sensing has the potential to improve the process by making it cheaper and more efficient, but only if appropriate characteristics can be determined from computer-models. This thesis describes the implementation of a forest visualization system and a corresponding user study that tests the accuracy of parameter estimation and forest characterization. The study uses data obtained from field-surveys to generate a computer-modeled forest. Five different stands were tested. Based on the quantitative results obtained, generally, there is no statistically significant difference in parameter estimation when comparing field-recorded movies and computer-generated movies.
Analysis Of The Design And Operation Of Mix-Bank Resequencing Areas, Arunkumar Subramanian
Analysis Of The Design And Operation Of Mix-Bank Resequencing Areas, Arunkumar Subramanian
Theses and Dissertations
Automotive assembly plants work on a pre-planned job sequence in order to optimize the performance of the assembly line. However, the job sequence becomes scrambled due to factors such as plant layout, process design, variability and uncertainty. Assembly plants use either a mix-bank or an automatic storage and retrieval system to regenerate the sequence before final assembly. A mix-bank, which is a set of parallel lanes, is the most common method used in the automotive industry to reconstruct the sequence. Only the first vehicles on the lanes are available for sequencing in a mix-bank set-up. Hence the lane selection policy …
A Spatial And Temporal Analysis Of Winter Weather Events In The Southeast United States With Correlations To Enso And Other Teleconnections, Christopher Clayborne Duke
A Spatial And Temporal Analysis Of Winter Weather Events In The Southeast United States With Correlations To Enso And Other Teleconnections, Christopher Clayborne Duke
Theses and Dissertations
Snow/ice events are indeed a rare occurrence in the southeast United States. As a result, residents of the Southeast often exemplify a passive attitude towards winter weather and are often unprepared when it strikes. This study analyzed every recorded winter weather event that struck the Southeast (Mississippi, Alabama, Georgia) from the winter season of 1961-'62 through 2000-'01 from both a spatial and temporal standpoint. Through the results of this study, it was evident that Georgia saw the most overall winter weather events and January seemed to be the most productive month overall. This study also analyzed teleconnection (ENSO, PNA, NAO, …
Gas Hydrates To Capture And Sequester Co2, Tao Ding
Gas Hydrates To Capture And Sequester Co2, Tao Ding
Theses and Dissertations
Reducing atmospheric CO2, a main source of greenhouse gas, has been accentuated recently. One focus is capture, separation, and sequestration of industrial CO2. As a hydrate former, CO2 forms hydrates at moderate temperatures and pressures. This phenomenon could be utilized to capture and separate CO2 from flue gases, and also has the potential to sequester CO2 in the deep sds. This research investigated the CO2-N2 separation efficiency of gas hydrates; it investigated the sequestration potential of CO2 hydrates in ocean sediments. The catalytic effect of surfactants in these processes was investigated. A fluorosurfactant FS-62 was mixed with SDS at 100ppm/1000ppm …
Cultural Awareness Levels Of Professionals And Students At Mississippi State University: International Education's Challenge, William Edward Stephen Cottrell
Cultural Awareness Levels Of Professionals And Students At Mississippi State University: International Education's Challenge, William Edward Stephen Cottrell
Theses and Dissertations
The literature indicates that America's demographic transformation is becoming a priority issue for higher education. Consequently, progressive educational leadership has a stake in international education development. Since enhanced cultural awareness is essential to this process, its scarcity in terms of measurable evidence has given rise to this study. Research questions included: (1) What is the level of cultural awareness among professional employees and students at Mississippi State University as measured by the Culture Shock Inventory Measurement Table? (2) Do demographic factors relate to cultural awareness levels of professional employees and students at Mississippi State University? (3) What role does international …
A Study Of The Impact Of The Mississippi Writing Project Summer Institute On Teacher Efficiency In Writing, Susan Gregory Dillard
A Study Of The Impact Of The Mississippi Writing Project Summer Institute On Teacher Efficiency In Writing, Susan Gregory Dillard
Theses and Dissertations
In order to provide evidence of the worth of the Summer Institute of the National Writing Project, this study sought to determine whether participation in the professional development would increase feelings of teacher efficacy in writing. The Summer Institute professional development is consistent with recommendations of researchers in teacher efficacy and in professional development. Albert Bandura?s social cognitive theory provides a contextual framework for both teacher efficacy and the Summer Institute. The study compared the pre- and posttest scores on the Teacher Efficacy Scale for Writing and Writing Orientation Scale (Graham, S., Harris, K. R., Fink, B. & MacArthur, C., …
Comparing Spectral-Object Based Approaches For Extracting And Classifying Transportation Features Using High Resolution Multi-Spectral Satellite Imagery, Sunil Reddy Repaka
Comparing Spectral-Object Based Approaches For Extracting And Classifying Transportation Features Using High Resolution Multi-Spectral Satellite Imagery, Sunil Reddy Repaka
Theses and Dissertations
Recent developments in commercial satellite products have resulted in a broader range of high quality image data, enabling detailed analysis. Transportation features have historically been difficult to accurately identify and structure into coherent networks; prior analyses have demonstrated problems in locating smaller features. One problem is that roadways in urban environments are often partly obscured by proximity to land cover or impervious objects. Ongoing research has focused on object-based methods for classification and different segmentation techniques key to this approach. For this application, software packages such as eCognition have shown encouraging results in assessing spatial and spectral patterns at varied …
An In Vitro Evaluation Of Chitosan As A Biomaterial Focusing On The Effects Of The Degree Of Deacetylation, Virginia Hamilton
An In Vitro Evaluation Of Chitosan As A Biomaterial Focusing On The Effects Of The Degree Of Deacetylation, Virginia Hamilton
Theses and Dissertations
The material characteristics play a role in the suitability of chitosan for biomedical applications. This is not surprising since the degree of deacetylation of chitosan influences antimicrobial activity, degradation rate, immune reaction and mechanical properties such as strength and elongation. This study examines chitosans of variable material characteristics for wound and bone healing applications. Chitosan films of 76, 78, 80, 87, 91, 92, and 95% degree of deacetylation were tested in vitro for cellular responses by fibroblast and bone cell lines. The in vitro responses were compared to the material characteristics of molecular weight, degree of deacetylation, swelling index, and …
A Comparative Analysis Of Proportional-Integral Compensated Shunt Active Power Filters, Matthew Alan Gray
A Comparative Analysis Of Proportional-Integral Compensated Shunt Active Power Filters, Matthew Alan Gray
Theses and Dissertations
This thesis deals primarily with the simulation and analysis of shunt active power filters (APF) on a three-phase power distribution system possessing a harmonic generating load. The shunt active power filters are analyzed based on effective total harmonic distortion (THD) levels and response to changing dynamics. These results are derived from the simulation of a pulse-width modulation (PWM) controlled voltage source inverter (VSI) with a capacitor connected to the DC side of the VSI. The primary difference between individual simulations is the particular control law implemented in the shunt APF.