Digital Commons Network^™

Cold Flow Performance Of A Ramjet Engine, Harrison G. Sykes

Master's Theses

The design process and construction of the initial modular ramjet attachment to the Cal Poly supersonic wind tunnel is presented. The design of a modular inlet, combustor, and nozzle are studied in depth with the intentions of testing in the modular ramjet. The efforts undertaken to characterize the Cal Poly supersonic wind tunnel and the individual component testing of this attachment are also discussed. The data gathered will be used as a base model for future expansion of the ramjet facility and eventual hot fire testing of the initial components. Modularity of the inlet, combustion chamber, and nozzle will allow …

Analysis And Optimization Of The Scheffler Solar Concentrator, Simone Alberti

Master's Theses

The Scheffler reflector is a new solar concentrator design which maintains a fixed focus while only having a single axis tracking mechanism. This design makes the construction and operation of high temperature solar concentrators accessible to developing nations. In this project, I wrote computer simulation codes to better understand the dynamics and the effect of deformation or deviations from ideal conditions in order to define necessary manufacturing and operational tolerances. These tools and knowledge drove the prototyping of new reflector concepts by myself and other students on my team. A fiberglass prototype was able to drive the cost of a …

Methane Production By A Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water, Sean Richard Thomson

Master's Theses

Packed-bed digesters are an alternative to covered lagoon digesters for methane production and anaerobic treatment of dilute wastewaters such as dairy barn flush water. The physical media of packed-beds retain biofilms, often allowing increased treatment rates. Previous studies have evaluated several types of media for digestion of dilute wastewaters, but cost and media fouling have setback commercial development. A major operational cost has been effluent recirculation pumping.

In the present effort, a novel approach to anaerobic digestion of flush dairy water was developed at pilot-scale: broken walnut shells were used as a low-cost packed-bed medium and effluent recirculation was replaced …

Protective Effects Of Milk Phospholipids Against Uv-Induced Dna Damage In Human Skin Cells, Lan-Anh Nguyen

Master's Theses

Skin cancer is the most common type of cancer in the US. The American Academy of Dermatology estimated that more than 3.5 million new cases of skin cancer are diagnosed in the US each year and 1 in 5 Americans will likely to develop skin cancer in their life time. Most cases of skin cancer are caused by exposure to ultraviolet (UV) radiation from the sun. Some of the most common sunscreen ingredients are unstable and can form harmful radicals upon exposure to UV radiation. There is a strong clinical need for a more stable and effective sunscreen ingredient such …

Neighborhoods, Proximity To Daily Needs, & Walkability In Form-Based Codes, Evan Evangelopoulos

Master's Theses

Form-based codes are evaluated with criteria often requiring additional clarification. To better identify form-based code evaluation criteria, this thesis identifies the major intentions of form-based codes from the literature and focuses on the first intention, quality of life. The form-based code literature relates quality of life to three principles with underlying parameters: neighborhood with a center and edge, proximity to daily needs, and walkability. Neighborhood refers to the identification of walkable districts of about .25 mile radius with a clear center and edge. Proximity to daily needs requires diversity of uses in proximity to residential uses so that residents travel …

Field And Greenhouse Studies Of Phytoremediation With California Native Plants For Soil Contaminated With Petroleum Hydrocarbons, Pahs, Pcbs, Chlorinated Dioxins/Furans, And Heavy Metals, Matthew Robert Poltorak

Master's Theses

Native and naturalized California plant species were screened for their phytoremediation potential for the cleanup of soil contaminated with petroleum hydrocarbons (PHCs), poly-aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), chlorinated dioxins/furans, and heavy metals. This screening was followed by controlled greenhouse experiments to further evaluate the phytoremediation potential of the best candidates. Field specimens and soils used for this study were collected from the former Energy Technology Engineering Center (ETEC) at the Santa Susana Field Laboratory in Southern California that was operated by the Department of Energy (DOE). Soils at this site contain all of the contaminants of interest (COIs). Nine …

A Pareto-Frontier Analysis Of Performance Trends For Small Regional Coverage Leo Constellation Systems, Christopher Alan Hinds

Master's Theses

As satellites become smaller, cheaper, and quicker to manufacture, constellation systems will be an increasingly attractive means of meeting mission objectives. Optimizing satellite constellation geometries is therefore a topic of considerable interest. As constellation systems become more achievable, providing coverage to specific regions of the Earth will become more common place. Small countries or companies that are currently unable to afford large and expensive constellation systems will now, or in the near future, be able to afford their own constellation systems to meet their individual requirements for small coverage regions.

The focus of this thesis was to optimize constellation geometries …

The Relationship Between Bicycles And Traffic Safety For All Road Users, Jasmine A. Martin

Master's Theses

Over the past twenty years bicycle use as a mode of transportation has grown considerably in the United States. Other studies have examined the individual bicyclist’s risk in proportion to the growth in cycling across cities, a phenomenon referred to as ‘safety in numbers.’ This study expands from that research and examines the effect of cyclists on road safety for all road users.

The study examines the roles of bicycle modal split, a city wide analysis, and bicycle infrastructure, a site based analysis, in road safety outcomes. For the city based analysis, twenty years of crash data in 12 California …

Sex-Specific Distributions Of Leopard Sharks (Triakis Semifasciata) In An Estuarine Environment, Andrea Lynn Launer

Master's Theses

Estuaries are used seasonally by many elasmobranchs for reproduction and as nurseries. The character, location, and availability of elasmobranch habitats in estuaries are often altered by anthropogenic activities and environmental changes. These habitat changes may have different effects on groups within a shark population because sex-specific segregations are common for many elasmobranchs. Leopard Sharks (Triakis semifasciata) are important estuarine predators in California and exhibit sexual segregations. Movements of 13 Leopard Sharks (male n=6, female n=7) tagged with coded acoustic transmitters were monitored from March 14, 2013 to March 9, 2014 using moored receivers in Elkhorn Slough, CA. Movement patterns were …

The Role Of Type A Behavior Pattern On The Stressor-Strain Relationship In Nurses, Jenny Anh Thu Le

Master's Theses

Three models (direct effects, moderated effects, and mediated effects) were used to test the role of Type A Behavior Pattern (TABP) in the stressor-strain relationship. The longitudinal study measured stressors (role ambiguity, role overload, and role conflict), strains (anxiety, tedium, affective commitment, intent to leave, and general well-being), and TABP in hospital nurses across two survey administrations. Stressors at Time 1 and strains at Time 2 were utilized for the analyses. TABP was found to have direct effects on anxiety and general well-being. In addition, TABP partially moderated the relationship between role conflict and anxiety and tedium, as well as …

Lynn Hershman Leeson's Roberta Breitmore And The Art Of Becoming A Woman, Maayan Glaser-Koren

Master's Theses

Throughout the emergence of second-wave feminism in the 1970s, social and political activism inspired female artists to create powerful artworks that critiqued institutional discrimination and supported women's reproductive rights and workplace equality. Feminist artists raised the public's awareness of women's issues by making women the subject of their artwork. In California especially, these creators turned to performance art, often taking their creations to the streets.

This thesis focuses on Lynn Hershman Leeson's performance, Roberta Breitmore (1974-1978), and examines how, through the steps of the performance, the piece's fictitious title character became a living resident of San Francisco. It will explore …

Hadrian's Wall: A Study In Function, Mylinh Van Pham

Master's Theses

Earlier studies on Hadrian's Wall have focused on its defensive function to protect the Roman Empire by foreign invasions, but the determination is Hadrian's Wall most likely did not have one single purpose, but rather multiple purposes. This makes the Wall more complex and interesting than a simple structure to keep out foreign intruders. Collective research on other frontier walls' functions and characteristics around the empire during the reign of Hadrian are used to compare and determine the possible function or functions of the Wall. The Wall not only served political purposes, but also had economic and social uses as …

A Theoretical Calculation Of The Polarization Of Scattered Light And A Comparison With Aeronet Measurements: Possible Applications To Aerosol Discrimination, Patricio German Piedra

Master's Theses

Despite considerable efforts by many atmospheric scientists, the identification and classification of aerosols remain a big challenge. On the atmospheric scale, large surveys of aerosols rely heavily on light scattering. The degree of linear polarization (DLP) is sensitive to the size and index of refraction of the aerosol particles and may provide an accurate method for discriminating aerosol types. In this thesis, Mie scattering was implemented to yield both the parallel and perpendicular components of the scattered electric field. In a first set of results, the calculated DLP was used to reproduce measurements of DLP along a principal plane for …

Benthic Macroinvertebrates In Uvas Creek, California, Downstream Of A Reservoir, Carole Ann Foster

Master's Theses

I sampled macroinvertebrates in May, July, and October 2008 in Uvas Creek, a reservoir-regulated stream in south Santa Clara County, California, to assess what factors (including canopy closure, turbidity, and stream flow) downstream of the reservoir were related to food availability for rearing juvenile Steelhead (Oncorhynchus mykiss). I found benthic and drifting macroinvertebrate biomass was considerably greater during most months in the more open-canopied two sites in the downstream reach as compared to the densely shaded, more turbid and silty two sites in the upstream reach. Abundance of important drifting aquatic invertebrates in May (chironomids, simuliids, and baetids) was proportional …

Well Clear: General Aviation And Commercial Pilots' Perception Of Unmanned Aerial Vehicles In The National Airspace System, Joseph Taylor Ott

Master's Theses

The purpose of this research was to determine how different pilot types perceived the subjective concept of the Well Clear Boundary (WCB) and to observe if that boundary changed when dealing with manned versus unmanned aircraft systems (UAS) as well as the effects of other variables. Pilots' perceptions of the WCB were collected objectively through simulator recordings and subjectively through questionnaires. Together, these metrics provided quantitative and qualitative data about pilot WCB perception. The objective results of this study showed significant differences in WCB perception between two different pilot types, as well as WCB significant differences when comparing two different …

The Abc's Of Being A Fan: An Operant Analysis Of Sports Consumption Behavior, Sean Pradhan

Master's Theses

In the last 30 years, behavioral psychologists have begun to systematically apply the principles of operant theory to the analysis of consumer behavior. Two behavioral approaches that have been successfully employed in consumer behavior analysis are the Behavioral Perspective Model (BPM; Foxall, 1990) and the Behavioral Ecology of Consumption (BEC; Rajala & Hantula, 2000). However, neither of these models has been used to analyze sports consumption behavior. One purpose of the present study was to integrate consumer behavior models with other theoretical approaches to the investigation of sports consumption behavior. A second purpose was to examine the effects of three …

Intentional Weight Loss Among Healthy Women: Behavior Patterns And Psychological Concerns, Kelsea Marie Ryan

Master's Theses

Although there is an extensive literature on women who are overweight, obese, or suffer from eating disorders, less is known about women who are at a healthy weight yet who are attempting to lose weight. To learn more about the psychological characteristics and behavioral patterns of such women, this study analyzed data from the American College Health Association's National College Health Assessment (ACHA-NCHA-II). We compared these women with two groups of women: (a) those who are at a healthy weight but who are not attempting to lose weight and (b) overweight women who are attempting to lose weight. We employed …

An Assessment Of Artificial Burrows For Burrowing Owls In Northern California, Sandra Menzel

Master's Theses

This study assesses artificial burrows as a management tool for burrowing owls (Athene cunicularia) at two study sites in northern California. The results of t-tests showed that artificial burrows that received annual surface maintenance (n = 113) at one site were occupied for a significantly (p ≤ 0.003) greater number of years than non-maintained (n = 51) artificial burrows at the other site. Maintained burrows were occupied for a mean of 1.90 years (SD = 2.04), compared to a mean of 0.45 years (SD = 0.97) for non-maintained burrows. Even with maintenance, occupancy rates dropped from 31% during the first …

Effects Of Depth, Site, And Season On Phenotypic Variation Of The Geniculate Coralline, Calliarthron Tuberculosum Around The Monterey Peninsula, California, Jasmine Elena Ruvalcaba

Master's Theses

Coralline algae are ubiquitous in near-shore marine environments. In particular, geniculate corallines occur in intertidal and subtidal habitats with abundances typically higher at shallow depths. Due to the high abundance of Calliarthron tuberculosum in Monterey kelp beds, this species was chosen to study effects of depth, site, and season on morphology and physiology. To further understand this pattern, populations from 3 and 10 m depth were sampled at two sites to examine morphometric variables including total length, total width, and number of branch tips as well as, physiological variables including respiration, photosynthetic, and calcification rates. Growth rates were also quantified …

The Role Of Lithology In Glacial Valley Cross-Sectional Shape In Sierra Nevada, California, Kaai Jensen

Master's Theses

It is commonly inferred that alpine glaciers transform fluvial valleys from V to U-shaped. It has been suggested that, under certain circumstances, glaciers are unable to modify V-shaped valleys and that lithology may play an important role in a glacier's ability to effectively erode bedrock. To test this hypothesis, six glaciated valleys with both U and V-shaped cross sections were chosen in the Sierra Nevada (CA) to examine how lithological properties might affect patterns of glacial erosion: Tenaya Canyon, Tuolumne River, Little Yosemite Valley, the San Joaquin River, the north fork of the King River, and Deadman Canyon. Valley profiles …

An Unsaturated Zone Flux Study In A Highly-Fractured Bedrock Area: Ground Water Recharge Processes At The Masser Recharge Site, East-Central Pennsylvania, Zhengzheng Qin

Master's Theses

This study tested the applicability of the Episodic Master Recession method and utilized the source-responsive flow theory to quantify ground water recharge and simulate preferential flow in the vadose zone at the Masser Recharge Site in east-central Pennsylvania. The ground water recharge shows strong seasonal variations. The shallow fractures form preferential flow paths and predominate in the vadose zone recharge processes, as reflected in the ground water-table elevation rise. They also influence the ground water-table recession rate, reflected in the rapid water-table recession in the deeper well with a high hydraulic conductivity fractured zone. Most importantly, the source-responsive flow model …

Hildegard Of Bingen: Mystic Of The Rhine, Zachary Jordan Young

Master's Theses

Hildegard of Bingen has a storied past and, as such, has been called many things. Among these are Sybil of the Rhine, Doctor of the Church, and mystic. This last title has given some pause, most notably Caroline Walker Bynum and Barbara Newman, who deny her the title in their preface and introduction to Hildegard's flagship work, Scivias. Scholars such as these fail to analyze Hildegard and her works on their own merits, instead comparing her to other female mystics rather than mystics in general. Although Hildegard does not experience the physical union that is the hallmark of the false …

Stereotype Threat, Self-Affirmation, And Women's Statistics Performance, Blanca Tapia

Master's Theses

Stereotype threat (fear of confirming a negative group stereotype that in turn can inhibit academic performance) has been implicated in the gender gap observed in the field of mathematics. Even though stereotype threat depresses women's performance, there has been much research reporting various interventions that ameliorate its negative effects. The current study investigated stereotype threat specifically in statistics--an unexplored area in the research literature --and the alleviating effects of self-affirmation. Participants in three conditions (control, stereotype threat, stereotype threat + affirmation) completed a statistics test. In both stereotype threat conditions participants were given a verbal prime to induce stereotype threat, …

A Vegetation Analysis On Horn Island, Mississippi, Ca. 1940 Using Characteristic Dimensions Derived From Historical Aerial Photography, Guy Wilburn Jeter Jr.

Master's Theses

Horn Island is part of the MS/AL barrier island chain in the northern Gulf of Mexico located approximately 18kn off the coast of Mississippi. This island’s habitats have undergone many transitions over the last several decades. The goal of this study was to quantify habitat change over a seventy year period using historical black and white photography from 1940. Using present NAIP imagery from the USDA, habitat structure was estimated by using geo-statistics, and second order statistics, from a co-occurrence matrix, to characterize texture for habitat classification. Percent land cover was then calculated to determine overall land cover change over …

Did Money Matter? Interpreting The Effect Of Displayed Wealth On Social Relations Within An Enslaved Community, Matthew Clark Greer

Master's Theses

Social relationships structure daily life in a startling, and important, variety of ways. However, when considering the social world that existed inside slave quarters across the Virginia Piedmont (and the Antebellum South), archaeologists have not been able to come to a clear consensus on how to approach the study of social networks; with some researchers focusing on social standing, seen most often through the role of material wealth to create connections, and others focusing on how interactions can be meaningfully interpreted from the archaeological record. This thesis represents an attempt to bridge these two theoretical stances, by looking to see …

Reinforcement Learning Of Distributed Surveillance Plans, Madhavi Chittireddy

Master's Theses

This thesis describes the design and implementation of a Reinforcement Learning algorithm on a camera surveillance model which is used to know the stackelberg strategies of attacker and defender. This reinforcement learning algorithm is compared with the uniform policy and hill climbing algorithms by executing them on a common set of different data files, generated programmatically with various combinations of problem size, location, and orientation transitions as well as rewards of attacker and defender. The comparison includes the time taken to obtain better stackelberg policy and the resulted final pay-off of the defender. This thesis shows that the reinforcement learning …

The Structure And Properties Of Clique Graphs Of Regular Graphs, Jan Burmeister

Master's Theses

In the following thesis, the structure and properties of G and its clique graph cl_t (G) are analyzed for graphs G that are non-complete, regular with degree δ , and where every edge of G is contained in a t -clique. In a clique graph cl_t (G), all cliques of order t of the original graph G become the clique graph’s vertices, and the vertices of the clique graph are adjacent if and only if the corresponding cliques in the original graph have at least 1 vertex in common. This thesis mainly investigates if …

Developments Of Gigapixel Microscopy, Siyuan Dong

Master's Theses

Fourier ptychographic (FP) imaging is a recently developed technique to get high-resolution high-throughput imaging. FP iteratively stitches together many variably illuminated, low-resolution intensity images in the Fourier space to expand the frequency passband and recover a high-resolution sample image.

There are several latest developments of the Fourier ptychographic imaging scheme. FP scheme can be used as adaptive imaging method. An image-quality metric is defined as a guide star for the optimization process, and system corrections are then performed to maximize such a guide star. The adaptive FP scheme performs system correction by modifying the complex transfer function in the recovery …

Development Of A High Precision Quantum Dot Synthesis Method Utilizing A Microfluidic Reactor And In-Line Fluorescence Flow Cell, William Henry Lafferty

Master's Theses

Quantum dots show great potential for use as spectral converters in solar cells, lighting applications, and biological imaging. These applications require precise control of quantum dot size to maximize performance. The quality, size, and fluorescence of quantum dots depend on parameters that are difficult to control using traditional batch synthesis processes. An alternative, high precision process was developed for the synthesis of cadmium-selenide quantum dots using a microfluidic reactor and fluorescence flow cell. The process required creating separate cadmium and selenium precursors that were then mixed in a nitrogen environment at 17°C. Using an NE-300^® syringe pump, the solution …

A Comparison Of Meat Purchasing Attitudes Across Generations, Jamie M. Mickelson

Master's Theses

To identify the factors that influence different generations meat purchasing behaviors. The list of the features for respondents to report are desirable to them when they purchase meat. The results of features will provide the answer to meat purchasing attitudes across generations, which will help to analyze which features influence generations purchasing behaviors. There were 290 respondents to the survey. The target markets are split in to four groups – young Millennials, older Millennials, Generation Xers, and Baby Boomers. The highest desirability for respondents decisions to purchase meat is good value for the money and second is no hormones added. …