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Articles 25051 - 25080 of 35662
Full-Text Articles in Entire DC Network
The Body Unbound, Kelley Pratt Sharp
The Body Unbound, Kelley Pratt Sharp
Electronic Theses and Dissertations
No abstract provided.
Relationships Between Parents' And Children's Eating Behaviors And Activity Levels, Christine Lynn Jayne
Relationships Between Parents' And Children's Eating Behaviors And Activity Levels, Christine Lynn Jayne
Electronic Theses and Dissertations
No abstract provided.
Solar-Based Single-Stage High-Efficiency Grid-Connected Inverter, Feng Tian
Solar-Based Single-Stage High-Efficiency Grid-Connected Inverter, Feng Tian
Electronic Theses and Dissertations
Renewable energy source plays an important role in the energy cogeneration and distribution. Traditional solar-based inverter system is two stages in cascaded, which has a simpler controller but low efficiency. A new solar-based single-stage grid-connected inverter system can achieve higher efficiency by reducing the power semiconductor switching loss and output stable and synchronized sinusoid current into the utility grid. Controlled by the digital signal processor, the inverter can also draw maximum power from the solar array, thereby maximizing the utilization of the solar array. In Chapter 1, a comparison between the traditional two-stage inverter and the single-stage inverter is made. …
Evolution Of Lamellar Structures In Al-Ag Alloys, Sephalika Senapati
Evolution Of Lamellar Structures In Al-Ag Alloys, Sephalika Senapati
Electronic Theses and Dissertations
In the present study, the formation and the evolution of lamellar structures in different Al-Ag alloys were investigated by transmission electron microscopy (TEM). Plates of the hexagonal [gamma] phase form semi-coherently on the {111} planes of the face centered cubic lattice of the alloy after the formation of Guinier-Preston zones. Guinier-Preston zones are metastable coherent preprecipitates which are silver rich in the aluminum-rich Al-Ag alloys. The decomposition of aluminum rich Al-Ag alloys, particularly the sequence of the later stages of precipitate formation was studied. With scanning electron microscopy and high-resolution transmission electron microscopy the development of the [gamma] phase was …
Mechanical Properties Of The Intervertebral Disc As An Estimator Of Postmortem Interval, Jennifer Noelle Jackson
Mechanical Properties Of The Intervertebral Disc As An Estimator Of Postmortem Interval, Jennifer Noelle Jackson
Electronic Theses and Dissertations
Currently, forensic scientists are only able to determine time since death (or postmortem interval) up to the first 60 hours. This is based largely on insect activity. Herein, it is proposed to use the degradation of the intervertebral disc (IVD) after death to determine a relationship between the mechanical properties of cadaveric tissue and time since death in order to extend the 60-hour window. To that end, 1 fresh human spine and 6 pig spines were each separated into sections (6 human and 48 pig), with each section having one intact disc. The sections were buried, unearthed, and cleaned, leaving …
Diffraction Studies Of Deformation In Shape Memory Alloys And Selected Engineering Components, Chandrasen Rathod
Diffraction Studies Of Deformation In Shape Memory Alloys And Selected Engineering Components, Chandrasen Rathod
Electronic Theses and Dissertations
Deformation phenomena in shape memory alloys involve stress-, temperature-induced phase transformations and crystallographic variant conversion or reorientation, equivalent to a twinning operation. In near equiatomic NiTi, Ti rich compositions can exist near room temperature as a monoclinic B19' martensitic phase, which when deformed undergoes twinning resulting in strains as large as 8%. Upon heating, the martensite transforms to a cubic B2 austenitic phase, thereby recovering the strain and exhibiting the shape memory effect. Ni rich compositions on the other hand can exist near room temperature in the austenitic phase and undergo a reversible martensitic transformation on application of stress. Associated …
The Effect Of Colloidal Stability On The Heat Transfer Characteristics Of Nanosilica Dispersed Fluids, Manoj Venkataraman
The Effect Of Colloidal Stability On The Heat Transfer Characteristics Of Nanosilica Dispersed Fluids, Manoj Venkataraman
Electronic Theses and Dissertations
Addition of nano particles to cooling fluids has shown marked improvement in the heat transfer capabilities. Nanofluids, liquids that contain dispersed nanoparticles, are an emerging class of fluids that have great potential in many applications. There is a need to understand the fundamental behavior of nano dispersed particles with respect to their agglomeration characteristics and how it relates to the heat transfer capability. Such an understanding is important for the development and commercialization of nanofluids. In this work, the stability of nano particles was studied by measuring the zeta potential of colloidal particles, particle concentration and size. Two different sizes …
Synthesis And Characterization Of Nanocrystalline Hydroxyapatite Powder; And The Effects Of Oxide-Based Sintering Additives On Tricalcium Phosphate, Himesh A. Bhatt
Synthesis And Characterization Of Nanocrystalline Hydroxyapatite Powder; And The Effects Of Oxide-Based Sintering Additives On Tricalcium Phosphate, Himesh A. Bhatt
Electronic Theses and Dissertations
Calcium phosphate (CP) materials have been used extensively for bone replacement and augmentation due to their similarity to the mineral component of bone. In addition to being non-toxic, they are biocompatible, not recognized as foreign materials in vivo, and most importantly, exhibit osteoconductive behavior, being able to help in bone formation during healing. CPs form an intimate physicochemical bond with the host tissue, termed osseointegration. However the main limitation of calcium phosphates is their inherent brittle nature and poor mechanical performance under complex stress states. As a result, these materials have been used clinically only in non-load-bearing applications, primarily as …
Solution Of Electromagnetic Scattering Parameters And Radiation Patterns Of Arbitrary Body Of Revolution Radiators, Wendell Brokaw
Solution Of Electromagnetic Scattering Parameters And Radiation Patterns Of Arbitrary Body Of Revolution Radiators, Wendell Brokaw
Electronic Theses and Dissertations
A novel full wave analysis method to determine the scattering parameters and the radiation field intensities of arbitrary Body of Revolution (BOR) radiators consisting of impenetrable media is explored through derived components of modal analysis and the method of moments (MoM). Modal excitation is utilized to excite the structural feed; allowing for a more accurate measure of the scattering parameters of the total structure as opposed to the use of external excitation sources. The derivation of the mode matching method introduces a novel approach to achieving a frequency independent coupling matrix that will reduce the computational requirements for iterations utilized …
Attainable Compressive Strength Of Pervious Concrete Paving Systems, Ann Marie Mulligan
Attainable Compressive Strength Of Pervious Concrete Paving Systems, Ann Marie Mulligan
Electronic Theses and Dissertations
The pervious concrete system and its corresponding strength are as important as its permeability characteristics. The strength of the system not only relies on the compressive strength of the pervious concrete but also on the strength of the soil beneath it for support. Previous studies indicate that pervious concrete has lower compressive strength capabilities than conventional concrete and will only support light traffic loadings. This thesis investigated prior studies on the compressive strength on pervious concrete as it relates to water-cement ratio, aggregate-cement ratio, aggregate size, and compaction and compare those results with results obtained in laboratory experiments conducted on …
Real-Time Realistic Rendering And High Dynamic Range Image Display And Compression, Ruifeng Xu
Real-Time Realistic Rendering And High Dynamic Range Image Display And Compression, Ruifeng Xu
Electronic Theses and Dissertations
This dissertation focuses on the many issues that arise from the visual rendering problem. Of primary consideration is light transport simulation, which is known to be computationally expensive. Monte Carlo methods represent a simple and general class of algorithms often used for light transport computation. Unfortunately, the images resulting from Monte Carlo approaches generally suffer from visually unacceptable noise artifacts. The result of any light transport simulation is, by its very nature, an image of high dynamic range (HDR). This leads to the issues of the display of such images on conventional low dynamic range devices and the development of …
A Methodology For Minimizing The Oscillations In Supply Chains Using System Dynamics And Genetic Algorithms, Ramamoorthy C.V.V. Lakkoju
A Methodology For Minimizing The Oscillations In Supply Chains Using System Dynamics And Genetic Algorithms, Ramamoorthy C.V.V. Lakkoju
Electronic Theses and Dissertations
Supply Chain Management (SCM) is a critically significant strategy that enterprises depend on to meet challenges that they face because of highly competitive and dynamic business environments of today. Supply chain management involves the entire network of processes from procurement of raw materials/services/technologies to manufacturing or servicing intermediate products/services to converting them into final products or services and then distributing and retailing them till they reach final customers. A supply chain network by nature is a large and complex, engineering and management system. Oscillations occurring in a supply chain because of internal and/or external influences and measures to be taken …
Indoor Geo-Location And Tracking Of Mobile Autonomous Robot, Mahesh Ramamurthy
Indoor Geo-Location And Tracking Of Mobile Autonomous Robot, Mahesh Ramamurthy
Electronic Theses and Dissertations
The field of robotics has always been one of fascination right from the day of Terminator. Even though we still do not have robots that can actually replicate human action and intelligence, progress is being made in the right direction. Robotic applications range from defense to civilian, in public safety and fire fighting. With the increase in urban-warfare robot tracking inside buildings and in cities form a very important application. The numerous applications range from munitions tracking to replacing soldiers for reconnaissance information. Fire fighters use robots for survey of the affected area. Tracking robots has been limited to the …
Antecedents Of Information Systems Backsourcing, Natalia Veltri
Antecedents Of Information Systems Backsourcing, Natalia Veltri
Electronic Theses and Dissertations
This dissertation examines backsourcing of corporate IS activities, and why IS outsourcing clients decide to backsource. Information Systems (IS) backsourcing is a business practice in which a company takes back in-house assets, activities, and skills that are part of its IS operations and were previously outsourced to one or more outside information service suppliers. Focusing on economic, strategic and relationship motives, a number of theoretical backsourcing factors is derived from transaction cost theory, agency theory, core competency perspective, IOR theory and marketing channels literature. To identify factors salient in IS backsourcing and to examine the process of backsourcing this dissertation …
Microstructural And Mechanical Characterization Of Al-Al2o3 Nanocomposites Synthesized By High-Energy Milling, Balaji Prabhu
Microstructural And Mechanical Characterization Of Al-Al2o3 Nanocomposites Synthesized By High-Energy Milling, Balaji Prabhu
Electronic Theses and Dissertations
The twin objectives of the investigation were (i) to synthesize Al/Al2O3 metal matrix composites (MMCs) with uniform distribution of the Al2O3 reinforcement in the Al matrix and (ii) to evaluate the effect of volume fraction and size of the reinforcement on the mechanical behavior of MMCs. This was achieved by successful synthesis of Al-Al2O3 MMCs with volume fractions of 5, 10, 20, 30, and 50%, and particle sizes of 50 nm, 150 nm, and 5 µm of Al2O3 synthesized from blended component powders by a high-energy milling technique. A uniform distribution of the Al2O3 reinforcement in the Al matrix was …
The Effect Of Immediate Feedback And After Action Reviews (Aars) On Learning, Retention And Transfer, Michael Sanders
The Effect Of Immediate Feedback And After Action Reviews (Aars) On Learning, Retention And Transfer, Michael Sanders
Electronic Theses and Dissertations
An After Action Review (AAR) is the Army training system's performance feedback mechanism. The purpose of the AAR is to improve team (unit) and individual performance in order to increase organizational readiness. While a large body of knowledge exists that discusses instructional strategies, feedback and training systems, neither the AAR process nor the AAR systems have been examined in terms of learning effectiveness and efficiency for embedded trainers as part of a holistic training system. In this thesis, different feedback methods for embedded training are evaluated based on the timing and type of feedback used during and after training exercises. …
Media Literacy And Critical Thinking: Is There A Connection?, Edward Arke
Media Literacy And Critical Thinking: Is There A Connection?, Edward Arke
Electronic Theses and Dissertations
This study investigated the relationship between media literacy and critical thinking skills. To date media literacy advocates have not developed a quantitative means of measuring media literacy. While numerous claims that media literacy and critical thinking are related, a review of the existing literature has not revealed any academic support for the assertion. As a result, a demographic survey and test to measure each skill set respectfully was administered to a sample of undergraduate college students. For this study, a new media literacy measure was developed. Statistical analysis of the test results did show a statistically significant correlation between the …
A Qualitative Analysis Of Parent Observations Of Children Diagnosed With A Developmental Speech Delay, Diana Patrick
A Qualitative Analysis Of Parent Observations Of Children Diagnosed With A Developmental Speech Delay, Diana Patrick
Electronic Theses and Dissertations
The present study used qualitative (phenomenological) research methodology to obtain and analyze the "personal stories" of mothers of children with had received a diagnosis of either developmental apraxia of speech (DAS) or developmental phonological disorder (DPD). Using a semi-structured interview, six mothers of children with DAS and five mothers of children with DPD were asked to reflect on specific aspects of the development of their child over time, with emphasis on communication development and communication challenges. In addition to providing rich descriptions of performance, the present study addressed the proposition that DPD and DAS are separate disorders by examining the …
Hiv/Aids Education In The Public High Schools Of Three Counties In Southwestern Pennsylvania, Timothy Sheets
Hiv/Aids Education In The Public High Schools Of Three Counties In Southwestern Pennsylvania, Timothy Sheets
Electronic Theses and Dissertations
Infection by HIV, the virus that causes AIDS, continues to grow worldwide. The only way to stop infection is to educate the population on prevention by identifying methods of transmission and behaviors that put a person most at risk. Schools are an effective place to teach young people about HIV. The Pennsylvania School Code requires that HIV/AIDS education be provided to all public school students while details of the instruction are locally determined. This study investigated HIV/AIDS education in three counties of southwestern Pennsylvania: what was included in the curricula, what was taught to the students, and how the content …
Optimization Of Network Parameters And Semi-Supervision In Gaussian Art Architectures, Roopa Chalasani
Optimization Of Network Parameters And Semi-Supervision In Gaussian Art Architectures, Roopa Chalasani
Electronic Theses and Dissertations
In this thesis we extensively experiment with two ART (adaptive resonance theory) architectures called Gaussian ARTMAP (GAM) and Distributed Gaussian ARTMAP (dGAM). Both of these classifiers have been successfully used in the past on a variety of applications. One of our contributions in this thesis is extensively experiments with the GAM and dGAM network parameters and appropriately identifying ranges for these parameters for which these architectures attain good performance (good classification performance and small network size). Furthermore, we have implemented novel modifications of these architectures, called semi-supervised GAM and dGAM architectures. Semi-supervision is a concept that has been used effectively …
Analysis And Design Of A Modular Solar-Fed Fault-Tolerant Power System With Maximum Power Point Tracking, Hussam Al-Atrash
Analysis And Design Of A Modular Solar-Fed Fault-Tolerant Power System With Maximum Power Point Tracking, Hussam Al-Atrash
Electronic Theses and Dissertations
Solar power is becoming ever more popular in a variety of applications. It is particularly attractive because of its abundance, renewability, and environment friendliness. Solar powered spacecraft systems have ever-expanding loads with stringent power regulation specifications. Moreover, they require a light and compact design of their power system. These constraints make the optimization of power harvest from solar arrays a critical task. Florida Power Electronics Center (FPEC) at UCF set to develop a modular fault-tolerant power system architecture for space applications. This architecture provides a number of very attractive features including Maximum Power Point Tracking (MPPT) and uniform power stress …
Design Implementation Of A Microcontroller Based External Facility Access Control System, Thomas Fulbright
Design Implementation Of A Microcontroller Based External Facility Access Control System, Thomas Fulbright
Electronic Theses and Dissertations
In order to solve the College of Engineering and Computer Science facility access problem, an automated system that provides exterior doors with a time schedule and allows authorized users to gain access to the facility after hours was developed. A microcontroller based system has been designed to interface with a personal computer. The system designed within this thesis can be used as a starting point for multiple facility access control systems. This thesis will describe the design, integration, test, and final delivery of a facility access system that incorporates the Texas Instruments MSP430 microcontroller, a magnetic card swipe reader, and …
Correlation Of Acoustic Emission Parameters With Weight And Velocity Of Moving Vehicles, Amar Kolgaonkar
Correlation Of Acoustic Emission Parameters With Weight And Velocity Of Moving Vehicles, Amar Kolgaonkar
Electronic Theses and Dissertations
The thesis is motivated by the goal of doing initial investigation and experimentation for the development of Weigh-in-Motion (WIM) system using acoustic emission phenomenon. A great deal of research is going on for measuring the weight of moving vehicles. Weigh-in-motion of commercial vehicles is essential for management of freight traffic, highway infrastructure design and maintenance, and monitoring of heavy weight vehicles. The research work presents a methodology for correlating the weight of a moving vehicle with acoustic emission parameters (such as counts and energy). Furthermore, the correlation between the speed of vehicle with the acoustic emission parameters is developed. Preliminary …
Scene Monitoring With A Forest Of Cooperative Sensors, Omar Javed
Scene Monitoring With A Forest Of Cooperative Sensors, Omar Javed
Electronic Theses and Dissertations
In this dissertation, we present vision based scene interpretation methods for monitoring of people and vehicles, in real-time, within a busy environment using a forest of co-operative electro-optical (EO) sensors. We have developed novel video understanding algorithms with learning capability, to detect and categorize people and vehicles, track them with in a camera and hand-off this information across multiple networked cameras for multi-camera tracking. The ability to learn prevents the need for extensive manual intervention, site models and camera calibration, and provides adaptability to changing environmental conditions. For object detection and categorization in the video stream, a two step detection …
Uv-Liga Compatible Electroformed Nano-Structured Materials For Micro Mechanical Systems, Bo Li
Uv-Liga Compatible Electroformed Nano-Structured Materials For Micro Mechanical Systems, Bo Li
Electronic Theses and Dissertations
UV-LIGA is a microfabrication process realzed by material deposition through microfabricated molds. UV photolithography is conducted to pattern precise thick micro molds using UV light sensitive materials, mostly SU-8, and electroforming is performed to fabricate micro metallic structures defined by the micro molds. Therefore, UV-LIGA is a bottom-up in situ material-addition process. UV-LIGA has received broad attention recently than LIGA a micro molding fabrication process using X-ray to pattern the micro molds. LIGA is an expansive and is limited in access. In comparing to LIGA, the UV-LIGA is a cost effective process, and is widely accessible and safe. Therefore, …
Development Of A Graphical User Interface For Cal3qhc Called Calqcad, Sheetal Gawalpanchi
Development Of A Graphical User Interface For Cal3qhc Called Calqcad, Sheetal Gawalpanchi
Electronic Theses and Dissertations
One of the major sources of air pollution in the United States metropolitan areas is due to automobiles. With the huge growth of motor vehicles and, greater dependence on them, air pollution problems have been aggravated. According to the EPA, nearly 95% of carbon monoxide (CO ) (EPA 1999) in urban areas comes from mobile sources, of which 51% is contributed by on road vehicles. It is well known fact that, carbon monoxide is one of the major mobile source pollutants and CO has detrimental effects on the human health. Carbon monoxide is the result of mainly incomplete combustion of …
Ascertaining The Growth Of A Company A System Dynamics Approach, Fakir Mohideen Noor Mohideen
Ascertaining The Growth Of A Company A System Dynamics Approach, Fakir Mohideen Noor Mohideen
Electronic Theses and Dissertations
Business is often about creating change for other businesses. At times, these changes affect only the company and at other times they affect the entire industry. There is a time in the life of a business when its fundamental way of functioning is questioned and is subjected to change. That change can mean an opportunity to rise to new heights, or it might even signal the beginning of the end. This fundamental change in any business is known as an inflection point. Understanding the nature of its inflection point and responding to that point suitably will help to safeguard a …
Enhancing Message Privacy In Wired Equivalent Privacy., Darshan Purandare
Enhancing Message Privacy In Wired Equivalent Privacy., Darshan Purandare
Electronic Theses and Dissertations
The 802.11 standard defines the Wired Equivalent Privacy (WEP) and encapsulation of data frames. It is intended to provide data privacy to the level of a wired network. WEP suffered threat of attacks from hackers owing to certain security shortcomings in the WEP protocol. Lately, many new protocols like WiFi Protected Access (WPA), WPA2, Robust Secure Network (RSN) and 802.11i have come into being, yet their implementation is fairly limited. Despite its shortcomings one cannot undermine the importance of WEP as it still remains the most widely used system and we chose to address certain security issues and propose some …
Detection Of The R-Wave In Ecg Signals, Sasanka Valluri
Detection Of The R-Wave In Ecg Signals, Sasanka Valluri
Electronic Theses and Dissertations
This thesis aims at providing a new approach for detecting R-waves in the ECG signal and generating the corresponding R-wave impulses with the delay between the original R-waves and the R-wave impulses being lesser than 100 ms. The algorithm was implemented in Matlab and tested with good results against 90 different ECG recordings from the MIT-BIH database. The Discrete Wavelet Transform (DWT) forms the heart of the algorithm providing a multi-resolution analysis of the ECG signal. The wavelet transform decomposes the ECG signal into frequency scales where the ECG characteristic waveforms are indicated by zero crossings. The adaptive threshold algorithms …
Rollback-Able Random Number Generators For The Synchronous Parallel Environment For Emulation And Discrete-Event Simulation (Spe, Ramaswamy Karthik Narayanan
Rollback-Able Random Number Generators For The Synchronous Parallel Environment For Emulation And Discrete-Event Simulation (Spe, Ramaswamy Karthik Narayanan
Electronic Theses and Dissertations
Random Numbers form the heart and soul of a discrete-event simulation system. There are few situations where the actions of the entities in the process being simulated can be completely predicted in advance. The real world processes are more probabilistic than deterministic. Hence, such chances are represented in the system by using various statistical models, like random number generators. These random number generators can be used to represent a various number of factors, such as length of the queue. However, simulations have grown in size and are sometimes required to run on multiple machines, which share the various methods or …