Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (306)
- Physical Sciences and Mathematics (174)
- Education (143)
- Social and Behavioral Sciences (121)
- Arts and Humanities (74)
-
- Life Sciences (71)
- Medicine and Health Sciences (67)
- Computer Sciences (64)
- Aerospace Engineering (54)
- Electrical and Computer Engineering (54)
- Mechanical Engineering (54)
- Civil and Environmental Engineering (46)
- Operations Research, Systems Engineering and Industrial Engineering (42)
- Educational Administration and Supervision (41)
- Psychology (38)
- Elementary and Middle and Secondary Education Administration (36)
- Business (35)
- Physics (30)
- Teacher Education and Professional Development (29)
- Earth Sciences (28)
- Educational Psychology (25)
- Elementary Education and Teaching (24)
- Geology (23)
- Communication (20)
- English Language and Literature (20)
- Special Education and Teaching (20)
- Biochemistry, Biophysics, and Structural Biology (18)
- Library and Information Science (18)
- Sociology (17)
- Art and Design (16)
- Institution
- Keyword
-
- Bolivia (9)
- Computer networks--Security measures (9)
- #antcenter (8)
- Decision making (8)
- Computer security (7)
-
- Geology (7)
- Microelectromechanical systems (7)
- Computer (6)
- ESL (6)
- Image processing (6)
- Optimization (6)
- Remote sensing (6)
- Strains and stresses (6)
- Utah (6)
- Women (6)
- Animation (5)
- Apoptosis (5)
- Computer network protocols (5)
- Depression (5)
- Drone aircraft (5)
- Fluid dynamics (5)
- Intervention (5)
- MEMS (5)
- Modeling (5)
- Monte Carlo (5)
- Rhetoric (5)
- Sculpture (5)
- Simulation (5)
- Values (5)
- Aerodynamics (4)
Articles 1 - 30 of 1079
Full-Text Articles in Entire DC Network
The Implementation Of Nanoimprint Lithography For The Fabrication Of Patterned Magnetic Media, Daniel David Marks
The Implementation Of Nanoimprint Lithography For The Fabrication Of Patterned Magnetic Media, Daniel David Marks
Theses and Dissertations
Advances in technology are having profound effects throughout society. This is no truer than in the way information is being stored. The primary form of information storage for at least the past millennium has been paper. Today, an ever increasing amount of information is being stored electronically. An increased demand for high-performance, low-cost information storage has been a major catalyst in increasing the popularity of hard drives. In 2002, two exabytes of original information was stored on hard drives. This is ten times the amount of all printed material in the world if it were converted to electronic files. To …
An Algebraic Reconstruction Technique (Art) For The Synthesis Of Three-Dimensional Models Of Particle Aggregates From Projective Representations, Daniel Jonathan Randall-Barrot
An Algebraic Reconstruction Technique (Art) For The Synthesis Of Three-Dimensional Models Of Particle Aggregates From Projective Representations, Daniel Jonathan Randall-Barrot
Theses and Dissertations
There exists considerable evidence that the shear behavior and flow behavior of granular materials is significantly dependent on particle morphology. However, quantification of this dependence is a challenging task owing to a dearth of quantitative models for describing particle shape and the difficulty of modeling angular particle assemblies. The situation becomes more complex when discrete element analyses of realistic 3-D particle shapes are required. The thesis attempts to address this problem by adapting the algebraic reconstruction technique (ART) to synthesize composite 3-D granular particles from statistically obtained 3-D shape descriptors of the particles in an aggregate mixture. This thesis extends …
Predicted Redidual Strength Of Damaged Isotrussâ® Structures, Travis S. Carroll
Predicted Redidual Strength Of Damaged Isotrussâ® Structures, Travis S. Carroll
Theses and Dissertations
This thesis utilized a linear analytical approach to explore the damage tolerance or residual strength as a function of increasing damage in traditional single and hybrid-grid IsoTruss® structures. Residual strength was studied for structures subjected to axial compression, torsion and flexural bending, independently. Carbon/epoxy material properties were applied in all load cases, and fiberglass/epoxy material properties were also applied in the flexural bending case. Prior to imposing damage conditions, the IsoTruss® structures were parametrically optimized to achieve the highest strength-to-weight ratios. Typical compression strut, driveshaft, and utility pole specifications governed the design strength dimensions and boundary conditions. Damage growth was …
Learning Successful Strategies In Repeated General-Sum Games, Jacob W. Crandall
Learning Successful Strategies In Repeated General-Sum Games, Jacob W. Crandall
Theses and Dissertations
Many environments in which an agent can use reinforcement learning techniques to learn profitable strategies are affected by other learning agents. These situations can be modeled as general-sum games. When playing repeated general-sum games with other learning agents, the goal of a self-interested learning agent is to maximize its own payoffs over time. Traditional reinforcement learning algorithms learn myopic strategies in these games. As a result, they learn strategies that produce undesirable results in many games. In this dissertation, we develop and analyze algorithms that learn non-myopic strategies when playing many important infinitely repeated general-sum games. We show that, in …
Customer Acquisition Training For Acn Independent Representatives, Kaly Gillette Shippen
Customer Acquisition Training For Acn Independent Representatives, Kaly Gillette Shippen
Theses and Dissertations
The following report discusses the design, development, and evaluation of an online training on customer acquisition of telephone customers for a telecommunications company called ACN. The report includes a description of the following elements of the project: (a) the need and purpose for the instruction, (b) the target audience of the instruction, (c) the methodology and rationale for the design of the instruction based on relevant literature, (d) an existing materials search, (e) the instructional materials, (f) the evaluation, (g) the critique, (h) the schedule, and (i) the final budget report. The instruction was found to effectively teach learners the …
Delayed Versus Immediate Feedback In An Independent Study High School Setting, Duane C. Lemley
Delayed Versus Immediate Feedback In An Independent Study High School Setting, Duane C. Lemley
Theses and Dissertations
Although there is general agreement that feedback plays an important role in student performance, the majority of the studies found in the research literature explore the impact of different types of feedback in a traditional and university-level setting. In order to explore the impact of different feedback types in a non-traditional distance learning setting, 352 high school students enrolled in courses offered through BYU's Independent Study (IS) department received either delayed feedback or immediate feedback generated by Speedback™, BYU's automated grading and feedback program, depending on whether they had opted to submit end of unit assignments by mail or …
Using Prospect Theory To Investigate Decision-Making Bias Within An Information Security Context, Neil J. Schroeder
Using Prospect Theory To Investigate Decision-Making Bias Within An Information Security Context, Neil J. Schroeder
Theses and Dissertations
Information security is an issue that has increased in importance over the past decade. In this time both practitioner and academic circles have researched and developed practices and process to more effectively handle information security. Even with growth in these areas there has been little research conducted into how decision makers actually behave. This is problematic because decision makers in the Department of Defense have been observed exhibiting risk seeking behavior when making information security decisions that seemingly violate accepted norms. There are presently no models in the literature that provide sufficient insight into this phenomenon. This study used Prospect …
Toiling Among The Seed Of Israel: A Comparison Of Puritan And Mormon Missions To The Indians, Christina A. Skousen
Toiling Among The Seed Of Israel: A Comparison Of Puritan And Mormon Missions To The Indians, Christina A. Skousen
Theses and Dissertations
Substantial comparative analyses of Puritanism and Mormonism are lacking in historical scholarship, despite noted similarities between the two religions. This study helps to fill that void by comparing the Puritan and Mormon proselytization efforts among the Indians that occurred at the respective sites of Massachusetts Bay Colony and the Southern Indian Mission. In my examination of the missionization attempts that took place at these two locations, I analyze a common motive and method of the two denominations for attempting to Christianize the Indians. The Puritan and Mormon missionaries proselytizing in Massachusetts Bay Colony and the Southern Indian Mission shared an …
The Making Of The Ahupuaa Of Laie Into A Gathering Place And Plantation: The Creation Of An Alternative Space To Capitalism, Cynthia Woolley Compton
The Making Of The Ahupuaa Of Laie Into A Gathering Place And Plantation: The Creation Of An Alternative Space To Capitalism, Cynthia Woolley Compton
Theses and Dissertations
This dissertation is a labor history of the Laie sugar plantation between 1865 and 1931. It explores intercultural and race relations that were inherent to colonial and plantation processes in Hawaii. Particular attention is given to the role of religion in advancing the colonial project. In 1865 Mormon missionaries bought approximately 6,000 acres with the hope of creating a gathering place for Hawaiian converts to settle in. The ideal of the gathering was a metaphor the missionaries brought with them from Utah, and it was a metaphor appropriated by Hawaiians and infused with their own cultural meanings, particularly the importance …
Electromagnetism In Gravitational Collapse, Craig Ernest Skinfill
Electromagnetism In Gravitational Collapse, Craig Ernest Skinfill
Theses and Dissertations
A numerical approach to including electromagnetism with general relativity is developed using GRAXI as a starting point. We develop a mathematical model describing electromagnetism coupled to a scalar field in an evolving axisymmetric spacetime. As there are numerous formulations of electromagnetism, we evalute different formulations in a limited flat space case. The full curved space system is then developed, using the flat case as a guide to implementing electromagnetism. This model is then implemented using GRAXI as a code base.
Toward A Domain Theory Of Fluent Oral Reading With Expression, Reo H. Mcbride
Toward A Domain Theory Of Fluent Oral Reading With Expression, Reo H. Mcbride
Theses and Dissertations
Today's educators are in need of tests or rating systems that provide specific and valid feedback to parents, students and programs. This need includes the area of expressive fluent oral reading. One way to address this need is to provide a rating system based on theoretical models that explore how fluency develops. This study explores the dimensions, constructs, or aspects that make up fluency. It also explores whether there is a sequence or order in how fluent oral reading with expression develops and the theoretical reasons for that ordering. This study further addresses whether word recognition or accuracy confounds the …
An Adaptive Wireless Lan Mac Scheme To Achieve Maximum Throughput And Service Differentiation, Wei Zha
An Adaptive Wireless Lan Mac Scheme To Achieve Maximum Throughput And Service Differentiation, Wei Zha
Theses and Dissertations
With the explosive deployment of wireless LAN technology in the past few years and increasing demand on multimedia applications, the efficient utilization of the precious wireless radio link resources and support of Quality of Service (QoS) in WLANs has become a prominent research issue. In this thesis, an adaptive p-persistent based I 802.11 MAC scheme in WLANs has been proposed. The proposed scheme can maximize the total channel throughput, and also provide service differentiation among multiple traffic classes. This is achieved by updating the transmission probabilities for the stations that compete for transmissions in a WLAN, adaptively based on the …
Approximate Methods For Solving Flowshop Problems, Pramod Jain
Approximate Methods For Solving Flowshop Problems, Pramod Jain
Theses and Dissertations
The flow shop scheduling problem is a classical combinatorial problem being studied for years. The focus of this research is to study two variants of the flow shop scheduling problem in order to minimize makespan by scheduling n jobs on m machines. A solution approach is developed for the modified flow shop problem with due dates and release times. This algorithm is an attempt to contribute to the limited literature for the problem. Another tabu search-based solution approach is developed to solve the classical flow shop scheduling problem. This meta-heuristic (called 3XTS) allows an efficient search of the neighboring solutions …
Fatigue Crack Growth Under Residual Stresses Around Holes, Ramesh Nagaralu
Fatigue Crack Growth Under Residual Stresses Around Holes, Ramesh Nagaralu
Theses and Dissertations
Compressive residual stresses induced by tensile overloads, compressive under loads, or by a cold-expansion process in specimens containing a circular hole and their influence on subsequent fatigue crack growth in aluminum alloys are studied. The finite element method is used to calculate residual stresses. The superposition method, which uses crack-tip stress intensity factors for cases involving remote loading and residual stresses, is used to calculate crack growth life for three kinds of tests from the literature: (1) fatigue of a circular hole specimen after an overload or under load, (2) single crack growing from a circular hole after a severe …
Critical Analysis Of Sic Sit Design And Performance Based Upon Material And Device Properties, Yunmo Sung
Critical Analysis Of Sic Sit Design And Performance Based Upon Material And Device Properties, Yunmo Sung
Theses and Dissertations
Recently, the need for high power, high frequency devices continues to grow with the increase in wireless communication, radar systems, HDTV, digital communication, and other military application of the RF spectrum. Traditionally when higher power is needed, one needs to either combine the output power of multiple devices or use vacuum tubes, which are still uncontested at very high power levels, capable of up to a few hundred kilowatts at 5 GHz [11]. But wide band gap semiconductor devices capable of competing in this application. Moreover, the static induction transistor (SIT) in silicon carbide can provide very high total power …
Definition, Analysis, And An Approach For Discrete-Event Simulation Model Interoperability, Tai-Chi Wu
Definition, Analysis, And An Approach For Discrete-Event Simulation Model Interoperability, Tai-Chi Wu
Theses and Dissertations
Even though simulation technology provides great benefits to industry, it is largely underutilized. One of the biggest barriers to utilizing simulation is the lack of interoperability between simulation models. This is especially true when simulation models that need to interact with each other span an enterprise or supply chain. These models are likely to be distributed and developed in disparate simulation application software. In order to analyze the dynamic behavior of the systems they represent, the models must interoperate. However, currently this interoperability is nearly impossible. The interaction of models also refers to the understanding of them among stakeholders in …
Development Of Conjugate Heat Transfer Capability To An Unstructured Flow Solver - U2ncle, Qingluan Xue
Development Of Conjugate Heat Transfer Capability To An Unstructured Flow Solver - U2ncle, Qingluan Xue
Theses and Dissertations
A precise prediction of the heat loads in metal materials in contact with the hot gas is an increasingly demanding problem in the design phase of the complex cooling schemes in the modern turbine engines. The coupled calculation of the fluid flow and the heat transfer is a promising approach as heat transfer coefficients are not necessary in the calculation and the heat transfer itself is part of the calculation and can be derived from local heat fluxes. Therefore, it is useful to incorporate an appropriate scheme for directly coupled heat transfer computations (conjugate heat transfer), capable of handling complex …
Work Replication: A Communication Optimization For Loci, Krunal Navinchandra Soni
Work Replication: A Communication Optimization For Loci, Krunal Navinchandra Soni
Theses and Dissertations
For distributed memory architectures, communication cost is a significant source of overhead in parallel scientific applications. Many proposed communication optimizations duplicate the behavior of well-written hand-tuned parallel code. Because of continuous changes in architectural components, these types of low-level optimizations are not always effective. This thesis seeks to develop a high-level optimization of work replication in which computations are replicated to minimize communications. There exist performance trade-offs between computation cost and communication cost because of work replication. Due to these trade-offs, it is required to determine which computations should be replicated to improve overall performance. This research presents the development …
A Study On The Split Delivery Vehicle Routing Problem, Kai Liu
A Study On The Split Delivery Vehicle Routing Problem, Kai Liu
Theses and Dissertations
This dissertation examines the Split Delivery Vehicle Routing Problem (SDVRP), a relaxed version of classical capacitated vehicle routing problem (CVRP) in which the demand of any client can be split among the vehicles that visit it. We study both scenarios of the SDVRP in this dissertation. For the SDVRP with a fixed number of the vehicles, we provide a Two-Stage algorithm. This approach is a cutting-plane based exact method called Two-Stage algorithm in which the SDVRP is decomposed into two stages of clustering and routing. At the first stage, an assignment problem is solved to obtain some clusters that cover …
An Investigation Of Firms' Earnings Management Practices Around Product Recalls, Zeeshan Ahmed
An Investigation Of Firms' Earnings Management Practices Around Product Recalls, Zeeshan Ahmed
Theses and Dissertations
This study investigates the earnings management practices of firms around product recalls. In recent years, the management of earnings around firm-specific events has received considerable attention in the finance and accounting literature. New equity issues, mergers and acquisitions, share repurchases, and management buyouts are some events around which at least some firms have been shown to manage their earnings to achieve managements? objectives. Product recalls offer yet another interesting occasion when managers have incentives to cover up the true financial performance of their firms and mislead investors. In order to determine whether firms announcing product recalls manage earnings more aggressively …
Finite Element Simulations Of Three-Dimensional Microstructurally Small Fatigue Crack Growth In 7075 Aluminum Alloy Using Crystal Plasticity Theory, Stephen R (Stephen Riley) Johnston
Finite Element Simulations Of Three-Dimensional Microstructurally Small Fatigue Crack Growth In 7075 Aluminum Alloy Using Crystal Plasticity Theory, Stephen R (Stephen Riley) Johnston
Theses and Dissertations
This thesis discusses plasticity-induced crack closure based finite element simulations of small fatigue cracks in three dimensions utilizing crystal plasticity theory. Previously, modeling has been performed in two dimensions using a double-slip crystal plasticity material model. The goal of this work is to extend that research using a full three-dimensional FCC crystal plasticity material model implementation that accounts for all twelve FCC slip systems. Discussions of Python scripts that were written to perform analyses with the commercial finite element code ABAQUS are given. A detailed description of the modeling methodology is presented along with results for single crystals and bicrystals. …
Identification And Location Of Sunken Logs Using Sidescan Sonar Technology, Aravindh Srivatsav Ravichandran
Identification And Location Of Sunken Logs Using Sidescan Sonar Technology, Aravindh Srivatsav Ravichandran
Theses and Dissertations
Identifying the location of sunken logs is a task of considerable interest in today?s world economy. The main motive of this work is to find and locate sunken cypress logs that were lost during the transit to a lumber mills. Underwater logging is possible because of the fact that many of the logs were barely affected by the decades of submersion. Cypress logs, the types of logs used in this research have a natural resistant to rotting. The other probability for the logs not being affected significantly, even staying in water for decades, is the high density of the growth …
Online Professional Development: The Experiences Of A First-Time Facilitator, Renee Gammill
Online Professional Development: The Experiences Of A First-Time Facilitator, Renee Gammill
Theses and Dissertations
Donmoyer (1990) suggested that knowledge gained from our own experiences or that of others may be applied to the improvement of practice. The purpose of this study was to provide insight into the experiences of a first-time online facilitator. The research question for this study was: How does a first-time facilitator understand the process of delivering instruction in an online environment? A case study design was applied to this research. The researcher/participant was the case under study in the context of the delivery of online instruction. The researcher who was also the online instructional facilitator experienced the process of delivering …
Mechanical Testing And Evaluation Of Epoxy Resins At Cryogenic Temperatures, Justin Reed Jackson
Mechanical Testing And Evaluation Of Epoxy Resins At Cryogenic Temperatures, Justin Reed Jackson
Theses and Dissertations
The objective of this research is to develop a test methodology to be used in determining which material properties affect the ultimate performance of a composite overwrapped pressure vessel (COPV) at liquid nitrogen (LN2) temperatures. The test methodology being evaluated is based on that used for ambient performance of COPVs and includes: resin properties, resin/fiber interface and COPV burst data. The suitability of these tests at LN2 temperatures will be evaluated. The resin properties are investigated by use of tensile tests to determine: strain to failure (%å), failure stress (óys), and elastic modulus (E). TThe objective of this research is …
Study Of Partial Discharge Activity In Magnet Wires Aged By Combined Stresses, Ashwini Mani
Study Of Partial Discharge Activity In Magnet Wires Aged By Combined Stresses, Ashwini Mani
Theses and Dissertations
Partial discharge testing is a nondestructive method of identifying possible premature insulation breakdown. Magnet wires are used in various electrical equipment like injection coils, solenoids, small transformers and motors. Winding wires used in high voltage systems are subjected to several stresses during operation, which considerably lowers their lifetime. A prolonged combined effect of these stresses causes aging of the wires, inception of partial discharge activity, and degradation of the organic material in the enamel coating and varnish used by the manufacturer. The tests were conducted for AWG 30 and AWG 31 twisted magnet wire samples. The samples are aged under …
Two- And Three-Plane Job Risk Classification Using Motion Capture: An Examination Of The Marras Et Al. Model, 1993, Tara Marie Cappelli
Two- And Three-Plane Job Risk Classification Using Motion Capture: An Examination Of The Marras Et Al. Model, 1993, Tara Marie Cappelli
Theses and Dissertations
Lower Back Disorders account for 16-19% of work related claims and 33-41% of dollars paid in workers? compensation (as cited in Marras, 1999), with impacts to society approaching $100 billion dollars annually (as cited in Marras et al., 1999). Dr. William Marras engineered a device to track trunk kinematics in order to develop a Job Risk Classification Model for predicting high-risk group probability of lower back injury. The device has been validated, but other technologies such as 3-D motion capture can potentially gather the same data. This study examined the use of motion capture to apply two- and three-plane lifting …
Testing The Floristic Quality Assessment Index In Natural And Created Wetlands In Mississippi, Usa, Brook Danielle Herman
Testing The Floristic Quality Assessment Index In Natural And Created Wetlands In Mississippi, Usa, Brook Danielle Herman
Theses and Dissertations
The U.S. Environmental Protection Agency has mandated that states must include the use of biological assessments in their water quality laws to assess the biological integrity of aquatic systems. The Floristic Quality Assessment Index (FQAI), which uses wetland vegetation to assess the biological integrity of an ecosystem, has not been tested in Mississippi. The purpose of this study was to test the efficiency of the FQAI in wetlands along a gradient of human influence. Coefficients of conservatism (CC) were assigned to plant species based on their tolerance to disturbance and fidelity to habitat. A negative correlation was found between the …
The Geology And Hydrology Of The Proposed Upper Mccurtain Creek Watershed Impoundment Choctaw County, Mississippi, Leonard D (Leonard Dwight) Rawlings
The Geology And Hydrology Of The Proposed Upper Mccurtain Creek Watershed Impoundment Choctaw County, Mississippi, Leonard D (Leonard Dwight) Rawlings
Theses and Dissertations
The McCurtain Creek watershed was proposed for a large reservoir project resulting in the commissioning of this study to assess the site?s geology, hydrogeology, and surface hydrology to find whether or not the site was suitable. Data was collected from 57 geophysical logs from coal exploration boreholes to produce geologic and aquifer cross sections. A program to assess discharge identified surface hydrology characteristics of the stream at five locations. Twenty-seven geotechnical boreholes, 23 standpipe piezometers, and the data from the coal exploration were used to map the water table using ArcGIS 8.3 software. Eighteen piezometers at stream sites, used to …
The Use Of Compression Precracking Constant Amplitude (Cpca) Test Method To Obtain Near-Threshold Fatigue Crack Growth Behavior In Aa7075-T7351, Dustin Henry Mcknight
The Use Of Compression Precracking Constant Amplitude (Cpca) Test Method To Obtain Near-Threshold Fatigue Crack Growth Behavior In Aa7075-T7351, Dustin Henry Mcknight
Theses and Dissertations
Traditionally, pre-cracking has been performed under tension-tension loading, followed by a load reduction scheme to obtain fatigue crack growth rate data in the near threshold regime. These data have been shown to exhibit load history effects due to remote crack closure. An alternative test method has been developed to minimize these load history effects. This test procedure uses compression pre-cracking to initiate a crack, followed by constant amplitude loading to grow the crack to failure. Compression-compression (C-C) loading as a means of forming a starter crack for fatigue crack growth is a relatively new concept. Cracks grown under C-C loading …
An Investigation Of The Performance In College Algebra Of Students Who Passed The Summer Developmental Program At Mississippi State University, Martha Hall Pratt
An Investigation Of The Performance In College Algebra Of Students Who Passed The Summer Developmental Program At Mississippi State University, Martha Hall Pratt
Theses and Dissertations
At Mississippi State University (MSU), students who do not meet full admission requirements may enroll in the Summer Developmental Program (SDP). During this ten-week summer program, students take four developmental courses to prepare them for college-level courses. MA 0003 Developmental Mathematics is the course designed to prepare these students for MA 1313 College Algebra. In addition, the Department of Mathematics and Statistics at MSU offers MA 0103 Intermediate Algebra to prepare students for MA 1313 College Algebra. The purpose of this study was to determine (a) whether there were correlations between student grades in MA 0003, MA 0103, and MA …