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Analysis And Design Of Interleaving Multiphase Dc-To-Dc Converter With Input Lc Filter, Kevin Thomas Delrosso

Master's Theses

The future of microprocessors is unknown. Over the past 40 years, their historical trend has been for adopting smaller and more powerful designs that drive the world that we live in today. The state of the microprocessor business today faces a crossroad, wishing to continue on the historical trend of doubling the number of transistors on a chip every 18 months (Moore’s Law) but also facing the realistic task of needing to power these sophisticated devices. With the low voltages and high currents that are required for these microprocessors to operate, it poses a difficult task for the future designers …

Control And Sensor Development On A Four-Wheel Pyramidal Reaction Wheel Platform, Jeffery Jay Logan

Master's Theses

The Pyramidal Reaction Wheel Platform, or PRWP, is used to simulate three-axis controls in a torque free space-like environment. The primary purpose of the system will be to evaluate the effects of conjoining sensors to maximize pointing accuracy. Furthermore, the system will incorporate a star tracker in conjunction with a Simulated Star Field (SSF) to better estimate the PRWP orientation. For the sake of this document, however, the goal is to implement a gyroscope, wheel rate sensors, and a make-shift accelerometer—to the PRWP—and integrate a controls algorithm such that three-axis controls are achieved for the PRWP. Three sensors were either …

Design And Optimization Of A Blood Vessel Mimic Bioreactor System For The Evaluation Of Intravascular Devices In Simple And Complex Vessel Geometries, Sara M. Leifer

Master's Theses

Coronary artery disease affects millions of people and the ability to detect and treat the disease is advancing at a rapid rate. As a result, the development of intravascular technologies is the focus of many medical device manufacturers. Specifically, coronary stent implantation is being performed in an increasing number of patients and a number of new stent designs have been introduced to the market, resulting in the need for improved preclinical testing methods. An in vitro tissue engineered “blood vessel mimic” (BVM) system has previously been established and its feasibility for the initial testing of newly emerging intravascular technology has …

Effects Of Filtration Temperature And Heat Treatment On Composition And Rheological Properties Of Whole Milk Ultrafiltration Retentates, John W. Montella

Master's Theses

ABSTRACT

Effects of Filtration Temperature and Heat Treatment on Composition and Rheological Properties of Whole Milk Ultrafiltration Retentates

John William Montella

For the first part of my thesis, the effects of filtration temperature and heat treatment on the compositional properties of whole milk Ultrafiltration retentate (UF) were studied. Ultrafiltration is primarily run at temperatures in the range of 50-55°C but more and more plants are starting to filter at refrigeration temperatures. In the ultrafiltration of milk, filtration temperature can affect the composition of the retentate by affecting the chemistry of milk components. The application of a pasteurization step can also …

An Exploration Of Tablet-Based Presentation Systems And Learning Styles, Ngan T. Phan

Master's Theses

Learning in the classroom can occur as a combination of students' personal effort to study class material, the instructor's attempt to present class material, and the interaction that takes place between instructor and students. In a more traditional setting, instructors can lecture by writing notes on a chalkboard or a whiteboard. If instructors want to display prepared lecture slides, they can use the overhead projector and write additional notes on top of these overhead transparencies. With many technological advances, various researchers are advocating towards integration between technology and learning. With the advent of tablet PCs, researchers recognize the potential usefulness …

Investigating Sense Of Community And Academic Success In First Year College Students In The Department Of Natural Resources Management, Kenneth Michael Hackman

Master's Theses

This study explored the relationship between sense of community, factors that influence sense of community, and the effect of academic success of first year students in the Natural Resources Management Department at Cal Poly State University, San Luis Obispo. An adapted version of the sense of community index was used to collect data from first year students (n=90) in the Natural Resources Management Department. Linear regression was used to determine which variables had a significant influence on sense of community and academic success. The results of the study indicated that there was not evidence that grade point average (GPA) had …

Analysis And Design Of Multiphase Multi-Interleave Dc-Dc Converter With Input-Output Bypass Capacitor, Furqan Mubashir Saleemi

Master's Theses

The power requirements for the microprocessor have been increasing as per Moore's Law. According to International Technology Roadmap (ITRS), the Voltage Regulator Module (VRM) for the microprocessor will be 200 W(with 1V, 200A output) in 2010. With the VRMs topology of synchronous buck, serious technical challenges such as small duty cycle, high switching frequencies, and higher current demands, contribute to decreased power density and increased cost. This thesis proposes a Multiphase Multi-Interleave Buck topology to solve the technical challenges of powering future microprocessors. The critical design parameter values are selected using the theoretical design equations and calculations. The design is …

The Role Of Phonological Similarity In Constructing A Developing Lexicon, Lin Li

Master's Theses

The implicational hierarchy of phonological feature development has proposed that children acquire native phonemic inventory in a systematic way, from the least articulatory-effort-required phonemes to most demanding ones. On the phonemic inventory level, the hierarchy suggests that perceptual features bearing by oral stops /p/, /b/, /t/, /d/, /k/, /g/ would appear ahead of perceptual features bearing by fricatives, affricatives and liquids ... while nasals stops ... would emerge in the middle. With the help of age-of-acquisition index and a phonemic change schema, the distributions of 489 phonological neighbors have been examined against the data from MacArthur Communicative Development Inventory to …

"Carry Me Back To Old Virginny" : Virginia And The Bonus March Of 1932, Steven Patrick Schultz

Master's Theses

On 6 May 1932 the Ways and Means Committee of the U.S. House of Representatives declined to pass along for a full vote in the House a bill that would have provided for immediate and complete payment of the Soldiers' Bonus, a small sum of money due in 1945 to veterans of World War I. In doing so it set in motion a chain of events that led to one of the most sordid affairs in American history, the Bonus March of 1932, when tens of thousands of World War I veterans traveled to Washington to ask their government for …

Reconsidering African-American Identity: Aesthetic Experiments By Post-Soul Artists, Letitia Guran Tudorica

Master's Theses

The present study attempts to offer an overview of the Post-Soul aesthetic and its role in re-writing African-American identity and focuses explicitly on three authors: Spike Lee, Touré, and Suzan-Lori Parks. My premise is that Post-Soul art is a direct result of the sweeping changes brought by the post-Civil Rights era in the African- American mentality, which inaugurated a new age in African-American art. Thus, the Post-Soul generation represents blackness as diverse, free to define itself in its own terms; they promote a critical take on black nationalism, and new perspectives on slavery. Most of the Post-Soul artists consider themselves …

Attentive Mothers Versus Minimally Invested/Neglectful Mothers : The Development Of New Neurons In The Hippocampus Specifically Activated By Foster Pup Exposure, Danielle Christina Worthington Stoneman

Master's Theses

As pregnancy progresses, the female is transformed from an animal that actively avoids pup-related cues (Kinsley, 1994) to one highly motivated to build nests, and retrieve, group, groom, and crouch over a set of pups. In the vast majority of events, motherhood progresses normally; in a striking subset, however, it does not. This study seeks to evaluate neurological differences in the dentate gyrus between primiparous females that respond maternally and those that do not when exposed to foster pups. It was hypothesized that the attentive mothers which perform the expected maternal behaviors have a different number of triple labeled BrdU(measuring …

Conflict, And Legacy Of Southern Colorado: 1890-1920, Annaliese M. Bonacquista

Master's Theses

This thesis is an interpretation of new perspective, as well as old and new information, on southern Colorado during 1890-1920, including the topics of the Great Strike of 1913-14 and the Ludlow Massacre. A focus is presented on community, conflict, and legacy during the time period that poses information on events that occurred in Las Animas County. Development of the community through census and demographic records, who was thought to be at fault for the Ludlow Massacre, and history and memory of the event that is carried on through the monument and education is presented. Throughout the past, these events …

The Effects Of A Vegetarian Diet On Iron Status In Female Students, Kimberly G. Englehardt

Master's Theses

Iron deficiency anemia is the most common nutritional deficiency disease worldwide (Mahan & Escott-Stump, 2004). Iron deficiency anemia is of major concern especially in women of child bearing age and those who follow a vegetarian diet. The objective of this study was to compare the nutrient and hematological values related to iron status in female university students following a vegetarian versus following a nonvegetarian diet. This study took a cross sectional analysis of 39 female students at California Polytechnic State University (Cal Poly State University) in San Luis Obispo, CA. Of the participants 19 were following a vegetarian diet and …

Green Neighborhood Standards From A Planning Perspective: A Leed For Neighborhood Deelopment (Leed-Nd) Case Study, Elissa R. Black

Master's Theses

This study examines the LEED-ND pilot rating program created by the United States Green Building Council (USGBC), the Congress for New Urbanism, and the Natural Resources Defense Council (NRDC) in 2007. The rating system is evaluated based on its application as a broad set of national standards meant to encourage green neighborhood development. The main case study is a master planned community in semi-rural Paso Robles, California. Among other things, the study discovers problems related to the application of the rating system in semi-rural and rural regions of the Western United States. Both the standards used by the rating system …

A Morphological And Hemodynamic Analysis Of Skeletal Muscle Vasculature, Stephanie Ann Wood

Master's Theses

The goal of this study was to develop analysis tools to assess skeletal muscle vasculature on a network level. In conjunction with this goal, this project also assessed whether the gracillis anterior muscle of a mouse was sufficiently thin to perform a comprehensive morphological analysis, and whether the data generated from these methods would yield reasonable computation of hemodynamic parameters. Horton's Law of Stream Numbers and the diameter-defined Strahler method were applied to assess the vasculature as a whole, and the results were comparable to previous work. The dimensional and branching characteristics of the network were similar to previous experiments; …

Predicting The Seismic Behavior Of The Dywidag Ductile Connector (Ddc) Precast Concrete System, Elizabeth Mary Kenyon

Master's Theses

Structural engineering is heavily dependent on the use of computers. When creating a building model using structural analysis software, it is required that the designer have an understanding of the system behavior and the modeling program capabilities.

Some engineers in the Southern California region are taking steps towards incorporating the Dywidag ductile connector (DDC) and super hybrid systems into building practice due to the advantages found in these systems’ construction methods and seismic performance.

As the DDC and super hybrid systems reach industry, the design engineer will need to model these systems using structural analysis programs. This report describes two …

The Effects Of Bisphosphonates On Bone Remodeling: Analysis Of Microdamage Targeting By Bmus, Bmu Velocity And Crack Surface Density, Daniel Wayne Hale

Master's Theses

Studies have indicated that microdamage in the bone matrix both activates and "steers" BMUs (Basic Multicellular Units, the groups of osteoclasts and osteoblasts that resorb and form bone respectively) toward the damage in order to replace damaged bone with new, mechanically sound bone. Also, bisphosphonate drugs have been shown to greatly suppress the remodeling process and, with such effects, are commonly used in the treatment of osteoporosis. It was hypothesized that BMUs do indeed target microdamage around them and tunnel away from the dominant lines of force in bone in order to remove the damage. Additionally it was believed that …

Spectral Conversion Of Light Using Cadmium Selenium Zinc Sulfide Core Shell Quantum Dots To Increase The Efficiency Of Photovoltaic Cells, Dan Madrid Marrujo

Master's Theses

Photovoltaics harness energy emitted from the sun. When the sun's energy is absorbed by a photovoltaic cell array, photons of light are converted into current. The amount of current produced by a photovoltaic cell is calculated by the difference between the energy of the incoming photon and the energy required for an electron to travel across the band gap of the photovoltaic cell. Traditional solar cells are commonly manufactured from silicon, which have a bandgap energy of 1.1 eV. If the photon's energy is equal to or greater than the band gap of silicon, electrons are excited from the valence …

Design And Verification Of A Sterile Incubator Volume For Maintaining Post-Deposition Cell Viability For Cell Printing Processes, Emily Hakun

Master's Theses

The growing field of tissue engineering requires the design and verification of an environmentally-controlled sterile incubator volume. As this technology advances and the field of cell printing emerges, the need for such a volume increases. This volume shall maintain post-deposition cell viability of printed cells, by maintaining volume sterility and controlling temperature. This becomes more important as more delicate cells are used. Sterility maintenance prevents contamination of the cells, while temperature regulation maintains the optimum temperature for cell viability. Several existing incubator systems are capable of regulating environmental conditions, but none are designed to function with a moving cell deposition …

A Risk Management Tool For The Reverse Supply Chain Network, Sheeva Banisalam

Master's Theses

The forward and reverse supply chains have unique characteristics that vary among different organizations. Most organizations manage and quantify risks in the forward supply chain by utilizing various available risk management tools. These risk management tools have been developed solely for the forward supply chain. This research presents the development and implementation of a risk management tool to be used to manage and quantify risks specifically in the reverse supply chain. Implementation of this tool at Company ABC demonstrates how the risk management tool is used in order to be beneficial to the organization. The tool is designed to be …

An Exploration Of Hole Filling Algorithms, Eric Firestone

Master's Theses

Laser range scanning is one of the leading methods for the acquisition of 3D models from real world objects. This process, however, introduces significant excess topological handles which increases the complexity of future processing, and lowers the quality of the acquired models. Previous research has shown that the hole filling step of the model creation pipeline is the primary cause of excess handles. We explore the hole filling process in detail and discuss the limits of hole fillers that work on the reconstructed surface and of those that work in the volumetric setting. In addition, we present our algorithm which …

Two-Dimensional Computer-Generated Ornamentation Using A User-Driven Global Planning Strategy, Dustin Robert Anderson

Master's Theses

Hand drawn ornamentation, such as floral or geometric patterns, is a tedious and time consuming task that requires much skill and training in ornamental design principles and aesthetics. Ornamental drawings both historically and presently play critical roles in all things from art to architecture; however, little work has been done in exploring their algorithmic and interactive generation. The field of computer graphics offers many algorithmic possibilities for assisting an artist in creating two-dimensional ornamental art. When computers handle the repetition and overall structure of ornament, considerable savings in time and money can result. Today, the few existing computer algorithms used …

A Coupling-Complexity Metric Suite For Predicting Software Quality, Christopher L. Gray

Master's Theses

Coupling Between Objects and Cyclomatic Complexity have long been used to measure software quality and predict maintainability and reliability of software systems prior to release. In particular, Coupling Between Objects has been shown to correlate with fault-proneness and maintainability of a system at the class level. We propose a new set of metrics based on a fusion of Coupling Between Objects and Cyclomatic Complexity that can be superior to Coupling Between Objects alone at predicting class quality. The new metrics use Cyclomatic Complexity to 1) augment Coupling Between Objects counting to assign a strength of a coupling between two classes …

Bone Mass Preservation And Fracture Risk Assessment With Bisphosphonate Therapy During Spaceflight, Christopher Gardina

Master's Theses

Space exploration and microgravity have substantial negative effects on the human body. Symptoms of space explorers include cardiovascular deconditioning, bone loss, muscular atrophy, and impairment of neurovestibular and sensory function. The great loss of bone due long-duration spaceflight increases fracture risk, jeopardizing the success of the mission and postflight recovery. Bisphosphonates may be able to counteract this bone loss by altering the remodeling process. These drugs increase bone mass, thus reducing fracture risk, but also lead to increased levels of fatigue microdamage. Fracture risk can be lowered by increasing both bone mass (quantity) and bone quality.

The purpose of this …

Theory, Simulation, Fabrication And Testing Of Double Negative And Epsilon Near Zero Metamaterials For Microwave Applications, Neil Patel

Master's Theses

Natural structures exhibiting simultaneous negative bulk permittivity and permeability have not yet been discovered. However, research interest over the past five years has grown with the proposition that artificial structures exhibiting these properties are realizable using specially-designed metallic inclusions embedded in host dielectric bodies. A periodic structure of metallic inclusions much smaller than the guided wavelength and embedded in a host dielectric medium is known in the physics and microwave communities as a "metamaterial". Such frequency-dependent effectively homogeneous materials may be designed to exhibit negative permeability and permittivity at certain frequencies. As predicted by electromagnetic theory, such negative index or …

Design Patterns Go To Hollywood: Teaching Patterns With Multimedia, Adam Dukovich

Master's Theses

Design Patterns have insinuated themselves into the forefront of computer science and software engineering practice. To this end, there has been much scholarship about the proper way to introduce them into the classroom. Studies indicate that understanding the contexts in which design patterns are to be used is one of the most (if not the most) difficult challenge in applying design patterns. However, little research on the topic attempts to solve the problem of better illuminating this context problem, preferring instead to focus on simplification of the patterns and better examples to explain them. This paper discusses a new paradigm …

Drop Impact Reliability Testing Lead-Free Chip Scale Packages, Andrew Farris

Master's Theses

Mobile and handheld electronics devices such as digital cameras, cell phones, and personal digital assistants (PDAs) are prone to be dropped in their lifetime. The drop event may result in failure of solder joints inside these devices. The importance and widespread use of these devices in both business and leisure activities continues to increase, so device failure is increasingly costly and inconvenient. Recently the European Union (EU) Restriction of Hazardous Substances (RoHS) and other countries' lead-free directives banned the use of lead in consumer electronics products. While this is a responsible environmental change for the electronics industry, it requires the …

Cfd As Applied To The Design Of Short Takeoff And Landing Vehicles Using Circulation Control, Tyler M. Ball

Master's Theses

The ability to predict the distance required for an aircraft to takeoff is an essential component of aircraft design. It involves aspects related to each of the major aircraft systems: aerodynamics, propulsion, configuration, structures, and stability and control. For an aircraft designed for short takeoffs and landings (STOL), designing the aircraft to provide a short takeoff distance, or more precisely the balanced field length (BFL), often leads to the use of a powered lift technique such as circulation control (CC). Although CC has been around for many years, it has never been used on a production aircraft. This is in …

Development Of A Cell Depositing System Using Inkjet Technology, Jason Robert Ozaeta

Master's Theses

In the past decade, advances in tissue engineering have allowed researchers to fabricate simple tissues. However, the process of creating these native tissues is a time consuming and inefficient process. A scaffold must first be fabricated then exposed to a sea of cells in the hopes of seeding. Furthermore, even though cells may have attached, more time must be spent in order to allow the cells to migrate to their ideal locations. To deal with this problem, researchers have investigated whether rapid prototyping principals could be adapted to facilitate the cell seeding process by placing cells in their respective locations …

Cal Poly Super System Photovoltaic Array Universal Dc-Dc Step Down Converter, Joseph Witts

Master's Theses

Standard converter topologies are usually presented with a voltage source as the input supply to the converters. However, a photovoltaic (PV) array has the I-V characteristics of a current source not a voltage source. This thesis details the design process of modifying the standard Buck and synchronous Buck converter topologies to function with either a voltage or current source input, making them universal DC-DC step down converters. This is accomplished by placing a capacitor at the converter's input to supply the pulsating current required for the Buck topologies to function properly. The equations for determining the capacitor's size and RMS …