Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (1970)
- Social and Behavioral Sciences (1742)
- Arts and Humanities (1392)
- Education (1196)
- Physical Sciences and Mathematics (945)
-
- Psychology (824)
- Medicine and Health Sciences (744)
- Life Sciences (495)
- Electrical and Computer Engineering (408)
- Mechanical Engineering (334)
- Civil and Environmental Engineering (295)
- Art and Design (285)
- Educational Administration and Supervision (257)
- Chemical Engineering (240)
- Earth Sciences (235)
- Materials Science and Engineering (234)
- English Language and Literature (230)
- Music (230)
- Civil Engineering (228)
- Chemistry (221)
- Computer Sciences (216)
- Communication (214)
- Architecture (213)
- Religion (207)
- Sociology (204)
- History (188)
- Geology (176)
- Biology (174)
- Communication Sciences and Disorders (172)
- Physics (160)
- Institution
- Keyword
-
- Education (49)
- Music (47)
- Graphic design (40)
- Theology (40)
- Religion, General (35)
-
- Philosophy (31)
- Apologetics (30)
- Christianity (25)
- Art (24)
- Fiction (23)
- Mass Communications (22)
- Design (21)
- Identity (21)
- Product design (20)
- Art education (19)
- Graphic Design (19)
- Landscape architecture (19)
- Literature, General (18)
- Religion, Philosophy of (18)
- Worship (18)
- Community (17)
- Curriculum (17)
- Fantasy (17)
- Geology (17)
- Culture (16)
- Communication (15)
- Women (15)
- Remote sensing (14)
- Creative writing (13)
- Faith (13)
- Publication Year
- Publication Type
Articles 3181 - 3210 of 8051
Full-Text Articles in Entire DC Network
Soil Variability And Its Influence On Plant Performance, Jeremy R. Klass
Soil Variability And Its Influence On Plant Performance, Jeremy R. Klass
Masters Theses
During recorded history, nearly all temperate deciduous forests in eastern North America have seen extensive agricultural land-use conversions. Persistent influences of agricultural disturbance continue to shape the diversity and composition of the plant community long after agriculture has ceased. While some measures of ecosystem functioning may recover relatively quickly from agricultural disturbance, other characteristics such as levels of organic matter, carbon, and phosphorus, may remain different from primary forests for much longer periods. The alteration of the original ecosystem due to agriculture practices has far reaching impacts on biotic and nutrient dynamics along with causing significant shifts in community composition …
Ditopic Dithiophosphonates And Their Related Rotaxanes, Robert Ray Baum Jr.
Ditopic Dithiophosphonates And Their Related Rotaxanes, Robert Ray Baum Jr.
Masters Theses
Grafting dithiophosphonate groups onto a naphthalenediimide core yields anionic axles, which in conjunction with the 15DN38C10 crown ether and cationic metallic systems generate neutral bimetallic rotaxanes. The association constant for the rotaxane system was calculated by the single-point method using 1H NMR spectroscopy. Metallic systems reacted with our anionic axles were SnMe3, SnPh3, Cu(PPH3)i, SnMe2, and SnPh2. The structures of several axle-metal complexes and one rotaxane were obtained by X-ray crystallography.
Population Ecotoxicology Of The Common Snapping Turtle In Agriculturally Impacted Lotic Ecosystems, Derrick L. Douros
Population Ecotoxicology Of The Common Snapping Turtle In Agriculturally Impacted Lotic Ecosystems, Derrick L. Douros
Masters Theses
Anthropogenic impacts on lotic systems, including pollutants, have had both direct and indirect negative effects on the aquatic habitats of the world. Goals of this study are: (1) Quantify atrazine, the atrazine metabolite diaminochlorotriazine (DACT), and glyphosate burdens in common snapping turtle (Chelydra serpentina) tissue from individuals collected within the Embarras River in Coles County, Illinois. (2) Quantify the atrazine, DACT, and glyphosate loads in water from the aquatic habitats in which common snapping turtles reside. (3) Quantify the relative abundance of all turtle species and movement patterns of common snapping turtles in this lotic ecosystem. Hoop nets and modified …
Sex Differences In Cyberbullying In Schools, Tyson Holder
Sex Differences In Cyberbullying In Schools, Tyson Holder
Masters Theses
The following study investigated sex differences in regards to cyberbullying beliefs and experiences. The study also sought to determine whether there was a relationship between level of self-esteem and the frequency in which one was cyberbullied. I hypothesized that girls would be more likely than boys to be cyberbullied, cyberbully others, tell an adult after being cyberbullied, and believe that an adult could do something to stop future acts of cyberbullying. The relationship between sex and cyberbullying was measured with two surveys. The researcher found that although there was no relationship between sex and rate of cyberbullying, there was a …
Hidden In Plain Sight: An Examination Of Entertainment-Education, Kendra M. Mcclure
Hidden In Plain Sight: An Examination Of Entertainment-Education, Kendra M. Mcclure
Masters Theses
Entertainment-Education is the process of weaving social messages into programming intended to entertain. The term was coined several decades ago, and the strategy has been widely used in mediated programs in the United States and abroad, particularly in developing countries. This thesis critiques the practice from a critical/culture perspective and particularly highlights issues that stem from political economy of media, agency, and critical pedagogy. To accomplish this, the volume is broken down into four sections: a survey of E-E and an explanation of its theoretical framework, an examination of Get Schooled, an initiative that fits the profile of an E-E …
Effect Of Prolonged Pacifier Use On Speech Articulation, Danielle Laprairie
Effect Of Prolonged Pacifier Use On Speech Articulation, Danielle Laprairie
Masters Theses
The hypothesis of the current research study was that children who frequently use pacifiers past the age of 2 years would display more articulation errors and patterns than children with limited or no pacifier use. The specific research question was whether there was a difference in articulation errors between children who used a pacifier and children who did not use a pacifier for a prolonged duration and frequency. Experimental subjects included seven children who had used a pacifier for at least 2 years and who were either currently using a pacifier or who had discontinued using a pacifier within 6 …
The Role Of Cognitive Complexity In The Endorsement Of Domestic Violence Myths, Kelly J. Gluba
The Role Of Cognitive Complexity In The Endorsement Of Domestic Violence Myths, Kelly J. Gluba
Masters Theses
The purpose of the study was to determine the relationship between cognitive complexity and its role in the endorsement of stereotypical domestic violence myths. The 103 participants were recruited from the Introduction to Psychology subject pool and completed the surveys online. Measures included the Sex Role Egalitarian Scale, The Religious Orientation Scale, The Multidimensional Quest Orientation Scale, Domestic Violence Myth Acceptance Scale, and the Need for Cognition Scale. Participants were divided into four categories: those that endorsed intrinsic religious beliefs, those that endorsed extrinsic religious beliefs, those that endorsed both, and those that endorsed neither. The participants who endorsed both …
The Eligibility Practices For The Category Of Specific Learning Disability In A Rural Special Education Cooperative In Illinois, Jennifer L. Hauptly
The Eligibility Practices For The Category Of Specific Learning Disability In A Rural Special Education Cooperative In Illinois, Jennifer L. Hauptly
Masters Theses
This study investigated the trends in assessment for specific learning disability in a rural special education cooperative in Illinois. The sample included assessment records for 135 students who graduated from high school with special education services under the category of specific learning disability. The assessment procedures were recorded and compared to trends in practice at the time. Results revealed that the use of traditional assessment practices, such as the IQ-achievement discrepancy, was less likely to be used once the alternative Flexible Service Delivery Model was initiated. To further investigate the impact of the Flexible Service Delivery Model, data were gathered …
Seismic Interpretation And Reservoir Characterization Of The Middle Frio Formation In The Stratton Field Gulf Coast Basin Of South Texas Using Three-Dimensional Seismic And Well Log Data, Uchenna H. Aboaja
Masters Theses
"The Stratton field is a large mature gas field located between Nueces County and Kleberg County in the northwest Gulf Coast Basin of south Texas. The Oligocene middle Frio Formation is one of the major progradational units within the Stratton field. It is characterized by rapid deposition and high subsidence rates that create complex internal facies architecture. The reservoir facies architecture of the middle Frio Formation is described as channel-fill deposits, crevasses-splay deposits, and floodplain mudstones. Previous two-dimensional seismic studies indicate some level of compartmentalization. Three-dimensional seismic and well log data provided by the Bureau of Economic Geology at the …
Intelligent Computational Argumentation For Evaluating Performance Scores In Multi-Criteria Decision Making, Rubal Wanchoo
Intelligent Computational Argumentation For Evaluating Performance Scores In Multi-Criteria Decision Making, Rubal Wanchoo
Masters Theses
"Multi Criteria Decision Making (MCDM) is a discipline aimed at assisting multiple stakeholders in contemplating a decision paradigm in an uncertain environment. The decision analysis to be performed involves numerous alternative positions assessed under varied criterion. A performance score is assigned for each alternative in terms of every criterion and it represents satisfaction of the criteria by that alternative. In a collaborative decision making environment, performance scores are either obtained when a consensus can be reached among stakeholders on a particular score or in some cases or controversial when stakeholders do not agree with each other about them. In the …
Characterization Of The Neutron Flux Spectrum At The Missouri University Of Science And Technology Research Reactor, Zachary Andrew Kulage
Characterization Of The Neutron Flux Spectrum At The Missouri University Of Science And Technology Research Reactor, Zachary Andrew Kulage
Masters Theses
"A new remotely accessible shielded cell is being constructed at the Missouri University of Science and Technology Research Reactor (MSTR). The heavily shielded cell will be able to receive highly irradiated specimens directly from the reactor and will be equipped with radiation-hardened cameras, remote manipulators and gamma spectroscopy. The cell will allow the manipulation and monitoring of highly activated specimens from both a workstation at the MSTR and at remote locations using a Webbased internet interface. The ability to access and control the shielded cell via a remote internet connection will make it useful to a wide variety of users. …
A Pilot Study In An Application Of Text Mining To Learning System Evaluation, Nitsawan Katerattanakul
A Pilot Study In An Application Of Text Mining To Learning System Evaluation, Nitsawan Katerattanakul
Masters Theses
"Text mining concerns discovering and extracting knowledge from unstructured data. It transforms textual data into a usable, intelligible format that facilitates classifying documents, finding explicit relationships or associations between documents, and clustering documents into categories. Given a collection of survey comments evaluating the civil engineering learning system, text mining technique is applied to discover and extract knowledge from the comments. This research focuses on the study of a systematic way to apply a software tool, SAS Enterprise Miner, to the survey data. The purpose is to categorize the comments into different groups in an attempt to identify "major" concerns from …
Thermodynamic Based Modeling For Nonlinear Control Of Combustion Phasing In Hcci Engines, Joshua Bradley Bettis
Thermodynamic Based Modeling For Nonlinear Control Of Combustion Phasing In Hcci Engines, Joshua Bradley Bettis
Masters Theses
"Low temperature combustion modes, such as Homogeneous Charge Compression Ignition (HCCI), represent a promising means to increase the efficiency and significantly reduce the emissions of internal combustion engines. Implementation and control are difficult, however, due to the lack of an external combustion trigger. This thesis outlines a nonlinear control-oriented model of a single cylinder HCCI engine, which is physically based on a five state thermodynamic cycle. This model is aimed at capturing the behavior of an engine which utilizes fully vaporized gasoline-type fuels, exhaust gas recirculation and intake air heating in order to achieve HCCI operation. The onset of combustion, …
Cloud Security Requirements Analysis And Security Policy Development Using A High-Order Object-Oriented Modeling Technique, Kenneth Kofi Fletcher
Cloud Security Requirements Analysis And Security Policy Development Using A High-Order Object-Oriented Modeling Technique, Kenneth Kofi Fletcher
Masters Theses
"Security continues to be a major challenge for cloud computing, and it is one that must be addressed if cloud computing is to be fully accepted. Most technological means of securing non-cloud computing systems can be either applied directly or modified to secure a cloud; however, no integrated model-based methodology is yet available to analyze cloud security requirements and develop policy to deal with both internal and external security challenges. This work proposes just such a methodology and demonstrates its application with specific cases. Cloud assets are represented by high order object models, and misuse cases together with malactivity swimlane …
Calcium Carbonate Precipitation Mechanisms And Geochemical Analysis Of Particulate Material Found Within The Waters Of Maramec Spring, St. James, Missouri, Kyle Steven Rybacki
Calcium Carbonate Precipitation Mechanisms And Geochemical Analysis Of Particulate Material Found Within The Waters Of Maramec Spring, St. James, Missouri, Kyle Steven Rybacki
Masters Theses
"The purpose of the present study is to determine whether a mineral phase is precipitating from solution in the natural Maramec Spring system giving the spring water a milky blue color, to identify the mineral phase, and to investigate potential mechanisms for inducing precipitation. Maramec Spring is a first-order magnitude spring located 11 km southeast of St. James, Missouri. The water that expels from Maramec Spring varies between being near saturation, but undersaturated in calcium, with respect to calcite (saturation index of 0.994 mg/L). Moving downstream, away from the conduit, the spring waters increase in pH and temperature. Eh is …
Doubly Fed Induction Generator With Integrated Energy Storage System For Smoothening Of Output Power, Nishant Swaraj Chouhan
Doubly Fed Induction Generator With Integrated Energy Storage System For Smoothening Of Output Power, Nishant Swaraj Chouhan
Masters Theses
"Wind energy is one of the fastest growing renewable energies in the world today. However, integration of wind power into the power system network is still confronting many challenges. One of the main challenges is the suppression of wind power fluctuations. This thesis focuses on integration of wind power with energy storage to overcome the integration challenges. The first part of this thesis investigates the suitability of energy storage systems for transmission, distribution and wind farm applications. A review on the available energy storage systems is performed considering several criteria. Efforts are made to investigate solutions that meet all the …
Modeling The Practical Performance Of Switched-Capacitor Converters And A Method For Automating State-Space Model Generation, Jordan M. Henry
Modeling The Practical Performance Of Switched-Capacitor Converters And A Method For Automating State-Space Model Generation, Jordan M. Henry
Masters Theses
"A new modeling technique and a method for automating the modeling process are introduced for analyzing complex switched-capacitor (SC) converters. The model uses conventional circuit analysis methods to derive state-space models of each switching state. Steady-state performance is derived and expressed as an equivalent resistance. Whereas previous techniques have provided either the detailed performance of a simple SC converter or the limiting performance of a complex SC converter, this new model is flexible enough to provide detailed performance for any practical converter. Nonuniform component choices, asymmetric duty cycles, and other deviations from an ideal converter can be readily included. Dynamics …
An Analysis Of The Integration Of Lean And Safety, Pankaj Mahesh Pai
An Analysis Of The Integration Of Lean And Safety, Pankaj Mahesh Pai
Masters Theses
"The lean philosophy has proven potential to help businesses improve productivity and reduce its losses. Lean can give businesses a cutting edge in this age of global competition. The fundamental principle of lean is to identify wastes in the system and reduce or eliminate them. There is a concern that during lean implementations, the focus on productivity may result in health and safety issues being ignored or worse, changes driven by lean may introduce new hazards. The relationship between lean and safety is not clearly understood. Lean and safety should be compatible. Both strive to improve processes. Both are against …
Content Based Image Retrieval For Bio-Medical Images, Vikas Nahar
Content Based Image Retrieval For Bio-Medical Images, Vikas Nahar
Masters Theses
"Content Based Image Retrieval System (CBIR) is used to retrieve images similar to the query image. These systems have a wide range of applications in various fields. Medical subject headings, key words, and bibliographic references can be augmented with the images present within the articles to help clinicians to potentially improve the relevance of articles found in the querying process. In this research, image feature analysis and classification techniques are explored to differentiate images found in biomedical articles which have been categorized based on modality and utility. Examples of features examined in this research include: features based on different histograms …
A Qualitative Study Of Heterosexual Ally Development Among The Traditional Student Population At A Mid-Sized Midwestern University, Miranda Therese Ambuske
A Qualitative Study Of Heterosexual Ally Development Among The Traditional Student Population At A Mid-Sized Midwestern University, Miranda Therese Ambuske
Masters Theses
The purpose of this study conducted, at a mid-sized Midwestern university, was to examine the ally development of heterosexual college students, specifically with gay, lesbian and bisexual populations. Five participants who were current college students, who self-identified as heterosexual allies, took part in open-ended life-history interviews in which they were asked to share their perspective on what may have affected their ally development. The interviews specifically probed what, if any, institutional resources, faculty or staff members may have assisted in their development, as well as if any precollege factors made them more susceptible to developing into an ally in college. …
Analysis Of The Theta-D Filter As Applied To Hit-To-Kill Interceptors And Satellite Orbit Determination, Michael W. Dancer
Analysis Of The Theta-D Filter As Applied To Hit-To-Kill Interceptors And Satellite Orbit Determination, Michael W. Dancer
Masters Theses
"When designing feedback control systems, there is often a need for estimation methods that provide system information that is not readily available via sensors placed within the system. In many cases a sensor that measures a particular system state either does not exist or is prohibitively expensive. In addition, all realistic systems contain some degree of nonlinearity. This thesis focuses on two such cases: missile guidance with bearings-only measurements and GPS satellite orbit determination. In each case, a new nonlinear filter, the [theta]-D method, is used and evaluated for its performance in providing the necessary estimation. To aid the filter …
Representation And Validation Of Domain And Range Restrictions In A Relational Database Driven Ontology Maintenance System, Patrick Garrett. Edgett
Representation And Validation Of Domain And Range Restrictions In A Relational Database Driven Ontology Maintenance System, Patrick Garrett. Edgett
Masters Theses
"An ontology can be used to represent and organize the objects, properties, events, processes, and relations that embody an area of reality [1]. These knowledge bases may be created manually (by individuals or groups), and/or automatically using software tools, such as those developed for information retrieval and data mining. Recently, the National Science Foundation funded a large collaborative development project for the semi-automated construction of an ontology of amphibian anatomy (AmphibAnat [2]). To satisfy the extensive community curation requirements of that project, a generic, Web-based, multi-user, relational database ontology management system (RDBOM [3]) was constructed, based upon a novel theoretical …
Emi Suppression Of Dc-Dc Synchronous Buck Converters By Layout Optimizations And Emi Prediction Using Non-Linear And Spice Circuit Co-Simulation, Ankit Bhargava
Emi Suppression Of Dc-Dc Synchronous Buck Converters By Layout Optimizations And Emi Prediction Using Non-Linear And Spice Circuit Co-Simulation, Ankit Bhargava
Masters Theses
"The oscillation on the phase voltage is due to the resonant structure formed by a parasitic loop (consisting of two FETs and the input decoupling capacitors) inductance and the output capacitance of the low side FET. Therefore, it is important to minimize this parasitic loop inductance. A simulation guideline is developed on full-wave modeling and simulation of buck converter layouts to estimate the parasitic loop inductances. Furthermore, this method is taken one step further to estimate the far-field radiation from the loop. These simulations were verified on six PCB variants of the buck converter and were compared with measurements in …
Calibration Of Resistance Factors For Axial Capacity Of Driven Pile Into Missouri Soil, Mulugeta Abay Kebede
Calibration Of Resistance Factors For Axial Capacity Of Driven Pile Into Missouri Soil, Mulugeta Abay Kebede
Masters Theses
"Over the past two decades the load resistance factor design (LRFD) has been accepted by the American Association for Transportation and Highway Officials (AASHTO) for the design of bridges. This approach is now gaining widespread popularity in the United States for substructure bridge design, including the design of driven pile foundations, as the states calibrate the geotechnical resistance factors for local geological conditions and practices. This study presents the geotechnical resistance factors calibrated for axially driven pile using the first-order reliability method (FORM) for the target reliability index of 2.33 and 3.0 based on 64 end-of-drives (EOD) and 22 beginning-of …
Establishing Workload Limitations For Application In Human Systems Integration, Muhammet Servet Gulum
Establishing Workload Limitations For Application In Human Systems Integration, Muhammet Servet Gulum
Masters Theses
"As the amount of technology involved in the typical workplace increases and standard operational procedures become increasingly sophisticated the danger of overloading an operator's mental resources is increasing. As much as these technological developments help operators with daily tasks, for example by providing information via monitors and wireless headsets; it also increased the mental workload due to the bombardment of information. Mental workload is commonly associated with information processing tasks, limits. With all the extra information inputs it is difficult to set limits where excessive information becomes dangerous. The workload optimization is critical as it directly affects system performance and …
Freeze Extrusion Fabrication Of 13-93 Bioactive Glass Scaffolds For Bone Repair, Nikhil D. Doiphode
Freeze Extrusion Fabrication Of 13-93 Bioactive Glass Scaffolds For Bone Repair, Nikhil D. Doiphode
Masters Theses
"We have investigated Freeze Extrusion Fabrication (FEF) of 13-93 bioactive glass to fabricate three dimensional scaffolds for bone tissue engineering. Bioactive glass paste was prepared for consistent extrusion through micro-nozzle and controlled porosity scaffolds were fabricated using additive manufacturing FEF. CAD models were prepared for different scaffold designs and computer controlled layer-by-layer deposition of pseudoplastic paste was carried out to in accordance. Liquid nitrogen assisted freezing of pastes was used for the consolidation of deposited layers. Post processing binder burnout and sintering schedules were designed for evaporation of organic binder and densification of glass. Sintering shrinkage was measured, and X-ray …
Performance Evaluation Of A Novel Diesel Fuel Air Separation And Filtration System For An Indirect Injection Diesel Engine, Michael Ray Hess
Performance Evaluation Of A Novel Diesel Fuel Air Separation And Filtration System For An Indirect Injection Diesel Engine, Michael Ray Hess
Masters Theses
"The objective of this research was to evaluate an air/fuel separation system known as a Fuel Preporator. The device's efficacy was determined by studying the effect of air entrainment on engine performance and fuel consumption of a General Motors 6.5 L naturally aspirated indirect injection (IDI) diesel engine. A test bed was developed to accommodate the test engine and test methods were adapted from federal regulations for steady-state engine testing (40 CFR 89 Subpart E). Cases of 0%, 5%, 10%, and 20% volumetric air entrainment were investigated for engine operation with and without the Fuel Preporator. Key measured engine performance …
Evaluation Of Liquefaction-Induced Lateral Spreading In The Midwest, Kermit Nathanial Applegate
Evaluation Of Liquefaction-Induced Lateral Spreading In The Midwest, Kermit Nathanial Applegate
Masters Theses
"The Central United States is home to several seismically active regions: the Wabash Valley Seismic Zone, the South Central Illinois Seismic Zone, and the New Madrid Seismic Zone. All three of these regions are capable of inducing large ground motion throughout the Mississippi Valley and along the eastern border of Missouri. This has been supported by many paleoseismic studies conducted throughout the region, which have identified numerous instances of liquefaction phenomena. The fluvial deposition process associated with the Mississippi river valley makes it a prime location for possible liquefaction and lateral spreading effects. However, there are few studies pertaining to …
Target Detection And Feature Evaluation Of Airborne Mine Target Images, Deepika Kamakshi Timmavajjula
Target Detection And Feature Evaluation Of Airborne Mine Target Images, Deepika Kamakshi Timmavajjula
Masters Theses
"Target segmentation and detection problem is one of the preliminary approaches in analyzing an image. Many edge, region and texture based techniques have been proposed in literature. These techniques often have limitations based on types of image data, kind of segmentation of interest and the problem domain. Mine detection problem dealt with for this thesis has mine target images which have a center target consisting of false alarm or mine patch which has to be detected and features evaluated to evaluate various parameter performances. Thus, segmenting the mine patch becomes the first step of analyzing these images. This thesis is …
Design And Critical Performance Evaluation Of Horizontal Axis Hydrokinetic Turbines, Suchi Subhra Mukherji
Design And Critical Performance Evaluation Of Horizontal Axis Hydrokinetic Turbines, Suchi Subhra Mukherji
Masters Theses
"The current work discusses the hydrodynamic performance of horizontal axis hydrokinetic turbines (HAHkT) under different turbine geometries and flow conditions. Hydrokinetic turbines are a class of zero-head hydropower systems which utilize kinetic energy of flowing water to drive a generator. However, such turbines often suffer from low-efficiency. A detailed computational fluid dynamics study was performed using a low-order k-[omega] SST (Shear Stress Transport) turbulence model to examine the effect of each of tip-speed ratio, solidity, angle of attack and number of blades on the performance of small HAHkTs with a power capacity of 10 kW. The numerical models (both two-dimensional …