Digital Commons Network^™

Artist-Driven Fracturing Of Polyhedral Surface Meshes, Tyler Casella

Master's Theses

This paper presents a robust and artist driven method for fracturing a surface polyhedral mesh via fracture maps. A fracture map is an undirected simple graph with nodes representing positions in UV-space and fracture lines along the surface of a mesh. Fracture maps allow artists to concisely and rapidly define, edit, and apply fracture patterns onto the surface of their mesh.

The method projects a fracture map onto a polyhedral surface and splits its triangles accordingly. The polyhedral mesh is then segmented based on fracture lines to produce a set of independent surfaces called fracture components, containing the visible surface …

Mode I Fracture Toughness Of Eight-Harness-Satin Carbon Cloth Weaves For Co-Cured And Post-Bonded Laminates, Josh E. Smith

Master's Theses

Mode I interlaminar fracture of 3k 8-Harness-Satin Carbon cloth, with identical fill and weft yarns, pre-impregnated with Newport 307 resin was investigated through the DCB test (ASTM D5528). Crack propagations along both the fill and weft yarns were considered for both post-bonded (co-bonded) and co-cured laminates. A patent-pending delamination insertion method was compared to the standard Teflon film option to assess its applicability to mode I fracture testing. The Modified Beam Theory, Compliance Calibration method, and Modified Compliance Calibration method were used for comparative purposes for these investigations and to evaluate the validity of the proposed Equivalent Stiffness (EQS) method. …

Terror As A Social Movement Tactic: Applying The Multi-Institutional Politics Approach To The Case Of The Abu Sayyaf Group, Erika Mae Lorenzana Del Villar

Master's Theses

Solely equating terrorism with criminality discounts the social, political, cultural, and historical motivations that drive people to employ violence as a strategy for collective action. Using the multi-institutional politics approach to social movements (Armstrong and Bernstein 2008), this study explores the choice of the Abu Sayyaf Group (ASG) in the Philippines to employ terror and violence as the primary social movement tactic to pursue their Islamic separatist cause. Analysis of archival and open-source data, together with original interviews, reveal that the problem is multi-institutional – developmental, cultural, historical, social and political all at the same time. The choice of violence …

Dense Recordings Reveal Typical And Atypical Development Of Tense Productivity In A Child Previously Diagnosed With Asd, Iris Chin

Master's Theses

Research on tense development has found that typically developing (TD) children are productive with tense morphology starting between two to two-and-a-half years old. Research findings on children with autism spectrum disorder (ASD), however, have been mixed. To better understand how tense development may differ between TD children and children with ASD, we examined the speech of two children, one TD [Cleo] and one that previously presented symptoms of ASD [Audrey]. This study is novel in its use of the Speechome Recorder, which collects dense audio-video recordings of children’s speech in home environments. We found that both children were productive with …

Paleostress Inversion Of Post-Alleghanian Brittle Faults In Paleozoic Accreted Terranes And The Early Mesozoic Higganum Dike, Eastern Connecticut, Mark R. Smith

Master's Theses

The passive margin of eastern North America contains reverse faults and folds in early Mesozoic basin-fill that are not characteristic of extension in the lithosphere during rifting. These observations deviate from the classical understanding of a passive margin and indicate other states of stress since rifting. To strengthen these observations, brittle faults were studied from the crystalline bedrock that is east of the Hartford Basin in Connecticut.

Fault-slip data from 1,060 faults were collected from the Gander cover and Avalon terranes and from the early Mesozoic Higganum dike. Because the dataset is large and heterogeneous, it was first processed using …

Modeling The Emergence Of Natural Language Lexicons, Russell Richie

Master's Theses

It is largely acknowledged that natural languages emerge from not just human brains, but also from rich communities of interacting human brains (de Boer, 2000; Galantucci et al., 2012; Senghas, 2005). Yet the precise role of such communities and such interaction on emergence of core properties of language has largely gone uninvestigated in naturally emerging systems, leaving the few existing computational investigations of this issue (de Boer, 2000, i.a.) somewhat ungrounded. Here we take a step towards investigating the precise role of community structure in the emergence of linguistic conventions with both naturalistic empirical data and computational modeling. We first …

State Bred Event Days Effect On Attendance And On-Track Wagering In Comparison To Open Race Day Counterparts, Cynthia C. Gumber

Master's Theses

Since 1978 casino and gaming facilities in the United States have grown substantially. Drawing outside customers has helped to improve the local communities surrounding the gaming facilities. In a similar fashion, United States horse racing aims at increasing traffic and wagering at race tracks throughout the United States (but unlike casinos little expansion). Along with the fiscal impact to the United States, the horse racing industry has created thousands of jobs, and the industry is experiencing continual growth in nominal gross wagering. Many state’s have breeder programs that enhance purses and horses bred and raced in- state. The goal of …

Digital Control Board For Phased Array Antenna Beam Steering In Adaptive Communication Applications, Mayur Bansal

Master's Theses

The application of adaptive communication techniques for mobile communications has attracted considerable interest in the last decade. One example of these techniques is spatial filtering through planar antenna array beam forming.

This thesis describes the development of a digital system that adaptively controls a phased array antenna. The radiating structure of the phased antenna array is tetrahedral-shaped and contains four antenna elements on each of its three faces. The overall system comprises of a digital control board with an external computer interface, an RF control board, and the phased antenna array. The RF controls the main lobe direction on the …

Women And The Second Estate In 16th Century Zambezia: Gendered Powers, A 'Puppet' African Queen And Succession In Vakaranga Society, 1500–1700, George G. Levin

Master's Theses

Women in vaKaranga society of the 15th to 17th centuries have been portrayed as oppressed by an "extremely patriarchal" system, but the reality, while still fitting the simple classification of a 'patriarchal' monarchy, indicates quite a bit more negotiation of gendered powers than women, as a class, experienced in the Mediterranean or East Asia. The vaKaranga were the architects of Great Zimbabwe, the capital of a growing state, colonizing their cousins of the Zambezi river, which their Kusi-Mashariki Bantu forefathers had traversed southward a millennium before. Civil war had (apparently) split one nation into two states, Mutapa (Monomotapa) and Khami …

Approximating The Seismic Amplification Effects Experienced By Solar Towers Mounted On The Rooftops Of Low-Rise Industrial Buildings, Peter Luiz Balla

Master's Theses

This thesis investigates the acceleration amplification experienced by solar towers mounted on the rooftops of low-rise industrial buildings during a seismic event. Specifically, this thesis looks to assess the validity of using amplification factors adopted by the ASCE 7-05Minimum Design Loads for Buildings and Other Structures to approximate seismic acceleration amplification for roof-mounted solar towers. To investigate the validity of the ASCE 7-05 amplification factors, this thesis conducts timehistory analyses of three theoretical solar towers mounted on the roof of a case study building. The time history analyses are conducted in the finite element computer modeling program SAP 2000 using …

Design And Implementation Of Eight-Legged Robotic Transporter, Jeremy David Depangher

Master's Theses

This thesis contains the design, manufacturing, and testing of a functional eight-legged robotic transporter based on the concept design laid out in U.S. Patent 7,246,671. The device is intended to achieve three different sequences of motion: regular driving, obstacle climbing, and stair climbing. The prototype was carried through concept design, analysis, selection of materials and components, manufacturing, software development, and final assembly and testing. The device can be assembled under multiple configurations, which harbor certain advantages and disadvantages. The results of the testing encourage the continuation of a second iteration of this concept.

Computational And Experimental Comparison Of A Powered Lift, Upper Surface Blowing Configuration, Jay M. Marcos

Master's Theses

In the past, 2D CFD analysis of Circulation Control technology have shown poor comparison with experimental results. In Circulation Control experiments, typical results show a relationship between lift coefficient, CL, vs blowing momentum coefficient, Cμ. CFD analysis tend to over-predict values of CL due to gridding issues and/or turbulence model selection. This thesis attempted to address both issues by performing Richardson’s Extrpolation method to determine an acceptable mesh size and by using FLUENT’s 2-equation turbulence models. The experimental results and CAD geometry were obtained from Georgia Tech Research Institute for comparison with the CFD analysis.

The study showed that 3D …

Robotic Fingerspelling Hand For The Deaf-Blind, Jerry Vin

Master's Theses

Because communication has always been difficult for people who are deaf-blind, The Smith-Kettlewell Eye Research Institute (SKERI), in conjunction with the California Polytechnic State University Mechanical Engineering department, has commissioned the design, construction, testing, and programming of a robotic hand capable of performing basic fingerspelling to help bridge the communication gap. The hand parts were modeled using SolidWorks and fabricated using an Objet rapid prototyper. Its fingers are actuated by 11 Maxon motors, and its wrist is actuated by 2 Hitec servo motors. The motors are controlled by Texas Instruments L293D motor driver chips, ATtiny2313 slave microcontroller chips programmed to …

The Steps To Growing Up Healthy Study: Barriers To Initial Behavior Change In A Primary Care Based Obesity Prevention/Reversal Program For Young Children, Dominica B. Hernandez

Master's Theses

BACKGROUND: Children of color are disproportionately affected by obesity creating a need for effective prevention/reversal programs. This study investigated a first dose response to a pediatric primary care-based obesity prevention program (Steps to Growing Up Healthy) targeting Hispanic and Black children. We examined whether mothers experienced barriers to behavior change and if maternal, child, environmental, or intervention variables predicted barrier status.

METHODS: Hispanic and Black mothers and their children (N=234; 51%F; 88.9% Hispanic; 35.4±8.7months) were recruited from an urban pediatric primary care clinic. The intervention utilized brief motivational counseling delivered by clinicians and nurses with the goal of …

Coalescence Kinetics Of Lipid Based Bicelles, Andrew Hu

Master's Theses

Uniform nanodisc structures can be self assembled from mixtures of different phospholipids. This study focuses on the theoretical and experimental growth kinetics of phospholipid based nanodiscs. Motivation for this project comes from the nanodisc’s small size and their potential use as a carrier for drug delivery. It was observed that at high total lipid concentration the nanodiscs are stable at approximately 10 nm in radius and can remain stable for a long period of time. However, growth of these nanodiscs are observed at relatively low total lipid concentration. The observed growth mechanism is not well understood. In this thesis dynamic …

Soil Nutrient Availability Properties Of Biochar, Nicole C. Esposito

Master's Theses

Biochar’s high porosity and negative surface charge allows for numerous soil and plant benefits such as increased water retention, high nutrient availability, and plant growth. By analysing biochar’s effect of all of these factors, a system can be put in place in which soils can be remediated with the proper soil amendments. This report discusses and tests the effects of varying rates of biochar on pH levels, cation exchange capacity, and nutrient exchangeability (of calcium, magnesium, sodium, and potassium) in soil. Corn plants were also grown in soils of varying amendment types and analysed for plant growth and germination to …

Attitude Estimation For A Gravity Gradient Momentum Biased Nanosatellite, Arash Mehrparvar

Master's Theses

Attitude determination and estimation algorithms are developed and implemented in simulation for the Exocube satellite currently under development by PolySat at Cal Poly. A mission requirement of ±5˚ of attitude knowledge has been flowed down from the NASA Goddard developed payload, and this requirement is to be met with a basic sensor suite and the appropriate algorithms. The algorithms selected in this work are TRIAD and an Extended Kalman Filter, both of which are placed in a simulation structure along with models for orbit propagation, spacecraft kinematics and dynamics, and sensor and reference vector models. Errors inherent from sensors, orbit …

Identifying Chromosome Rearrangements In The Allopolyploid Brassica Napus Using Pyrosequencing, Alexandra R. Barbella

Master's Theses

Allopolyploids form through the hybridization of two or more diploid genomes. A challenge to reproduction in allopolyploids is that pairing can occur between homologous chromosomes or homeologous chromosomes (i.e.different subgenomes.). Crossover between homeologous chromosomes can result in chromosome rearrangements that lower fertility and overall fitness. Rearrangements can alter the dosage of either entire chromosomes or just parts of chromosomes. Understanding the frequency and extent of rearrangements will help to explain the evolution and genome stabilization of agriculturally important allopolyploid species. Pyrosequencing is a useful tool in the study dosage changes in allopolyploids because it allows quantification of the relative contribution …

Effects Of Racism And Discrimination On Personality Development Among African American Male Repeat Offenders, Tiffany Nicole Lockett

Master's Theses

ABSTRACT

Effects of Racism and Discrimination on Personality Development among

African American Male Repeat Offenders

Tiffany Nicole Lockett

Throughout history in the United States, the African American community has consistently been the victim of social policies put in place to disenfranchise this population (Mauer & Chesney-Lind, 2002; Painter, 2007; Parham, White & Ajamu, 1999). With a longstanding presence of systemic racism and discrimination, the criminal justice system and the dominant culture continues to pathologize this minority group and advocate for increased penalties which further stigmatize African Americans, particularly males in this group (Reiman, 1996; Russell, 1998). Though most criminology research …

Workplace Incivility At The Daily Level: The Effects Of Rumination On Performance And Revenge Motives, Jenna Shapiro

Master's Theses

Ruminating about stressful experiences at work may have negative effects for employees and the organization, but has been widely overlooked in organizational research. In order to address this gap, I examined the process by which incivility affects performance and revenge motives in the workplace. A meditational model was tested, in which stress reactive rumination mediates the relationship between incivility and performance, as well as between incivility and revenge motives. These mediated relationships were examined at the intra-individual level, such that data-points were nested within employees over time. I surveyed 108 healthcare professionals daily over a two-week study period. The data …

Secondary Wood Producers’ Attitudes And Opinions Regarding Locally Grown Wood Material, Nathaniel G. Cyrus

Master's Theses

No abstract provided.

An Examination Of Marine Snow As A Pathway For Mercury Uptake In The Blue Mussel Mytilus Edulis, Veronica L. Ortiz

Master's Theses

Bioaccumulation of mercury (Hg), especially as methylmercury (CH₃Hg), in the aquatic food web is a continuing public health concern. Extensive research has been conducted regarding the uptake of Hg by various aquatic animals via three main vectors: sediment, bioseston, and water, but virtually no research exists with respect to uptake of CH₃Hgor inorganic mercury (Hg(II)) associated with marine snow. Marine snow composed of various organic and inorganic materials has been studied as an effective vertical transporter of nutrients and metals scavenged from the euphotic zone to the benthos. As various aquatic species utilize marine aggregates as …

Protein Turnover In Trained Male Endurance Runners Following Exercise, Jeffrey Del Favero

Master's Theses

No abstract provided.

Analysis And Comparison Of Parallel Plate Flow Chambers To Determine Consistency Of Fluid Forces On Cells, Sampat S. Nidadavolu

Master's Theses

Biological cells are constantly exposed to fluid forces inside the body. These fluid forces aid in certain physical and chemical reactions that cells need to maintain physiological function. To observe these forces in vitro, parallel plate flow chambers (PPFC) are used, where cells are placed inside the chamber and a fluid medium runs through the device exposing the cells to fluid forces to initiate a response. This has aided in proving that fluid forces influence cell function and are factors in various disease and physiological processes, such as the development of atherosclerotic plaque in blood vessels or bone growth. Many …

The Effects Of Poor Maternal Nutrition On Postnatal Growth And Development Of Lambs, Kristen N. Peck

Master's Theses

No abstract provided.

Fabrication And Characterization Of A Palladium/Porous Silicon Layer, Nicholas Hong Lui

Master's Theses

When porous silicon is plated with a catalytic metal, the two materials can act together as a single entity whose electrical properties are sensitive to its environment – the sensing component of an electrochemical gas sensor. Etching pores into silicon is an electrochemical process; and which type of doped silicon used is one of its key parameters. For nearly all reported porous silicon gas sensors, the silicon has been of the p-doped variety – because p-doped porous etching is better understood and the layers that result from it are more predictable – despite n-doped silicon having potentially significant benefits in …

A Compact, Reconfigurable Uhf Communication System Design For Use With Polysat's Embedded Linux Platform, Austin Williams

Master's Theses

The beginning of this thesis provides an overview of the heritage UHF Communication System design flown on CP2, CP3, CP4, CP5, and CP6, summarizing previous analysis of its performance, and providing the justification for a complete system re-design. High level requirements for the new UHF System are defined, and a trade study is performed on state-of-the-art single chip transceivers, low noise amplifiers, and transmit power amplifiers. These components are then designed into a functional communication system, with key components analyzed for proper impedance matching and performance characterization compared to expected datasheet values. Next, the system as a whole is characterized …

Qualitative Methods Used To Develop And Characterize The Circulation Control System On Cal Poly's Amelia, Eric N. Paciano

Master's Theses

The circulation control system onboard Cal Poly's Advanced Model for Extreme Lift and Improved Aeroacoustics was a critical component of a highly complex wind tunnel model produced in order to fulfill the requirements of a NASA Research Announcement awarded to David Marshall of the Aerospace Engineering Department. The model was based on a next generation, 150 passenger, regional, cruise efficient, short take-off and landing concept aircraft that achieved high lift through circulation control wings and over-the-wing mounted engines. The wind tunnel model was 10-ft in span, used turbine propulsion simulators, and had a functioning circulation control system driven from tunnel …

An Analysis Of Eliminating Electroosmotic Flow In A Microfluidic Pdms Chip, Cecile D. Redington

Master's Theses

The goal of this project is to eliminate electroosmotic flow (EOF) in a microfluidic chip. EOF is a naturally occurring phenomenon at the fluid-surface interface in microfluidic chips when an electric field is applied across the fluid. When isoelectric focusing (IEF) is carried out to separate proteins based on their surface charge, the analytes must remain in the separation chamber, and not migrate to adjacent features in the microfluidic chip, which happens with EOF.

For this project, a microfluidic chip was designed and commissioned to be photolithographically transferred onto a Si wafer. A PDMS component was then casted on the …

Effect Of Warm-Up Activity On Vertical Ground Reaction Forces In Basketball Players During Drop Jump Landings, Jacob Wesley Hinkel-Lipsker

Master's Theses

ABSTRACT

Effect of Warm-Up Activity on Vertical Ground Reaction Forces in Basketball Players During Drop Jump Landings

Jacob Hinkel-Lipsker

Purpose: The purpose of this study was to examine the effect of certain warm-up activities on vertical ground reaction forces (GRF_v) during a drop jump landing. Methods: Eight women and twelve men (mean age 22.6 ± 1.82 years) completed three warm-up activities on three separate days in a counterbalanced order: a passive stretching warm-up, a dynamic warm-up, and a no warm-up control. After completing each activity, participants were asked to perform eight drop jump landings on a force platform. …