Digital Commons Network^™

Tessellated Voxelization For Global Illumination Using Voxel Cone Tracing, Sam Thomas Freed

Master's Theses

Modeling believable lighting is a crucial component of computer graphics applications, including games and modeling programs. Physically accurate lighting is complex and is not currently feasible to compute in real-time situations. Therefore, much research is focused on investigating efficient ways to approximate light behavior within these real-time constraints.

In this thesis, we implement a general purpose algorithm for real-time applications to approximate indirect lighting. Based on voxel cone tracing, we use a filtered representation of a scene to efficiently sample ambient light at each point in the scene. We present an approach to scene voxelization using hardware tessellation and compare …

Prediction Of The Degradation Of Emerging Contaminants During Oxidative Treatment Via Analysis Of Reaction Rate Constants, Kellie Cochran

Master's Theses

Globally, water supplies are diminishing in quality while demand is continually increasing. The municipal water and wastewater sector has been paying increased attention to unregulated emerging organic contaminants. Advanced oxidation processes (AOPs), which produce hydroxyl radicles (•OH), have been developed and implemented to remove recalcitrant emerging contaminants left by conventional treatment processes. The current understanding of the removal efficacy of AOPs for emerging contaminants is limited. This study analyzes the ability of an AOP involving ozone and multi-walled carbon nanotubes (MWCNTs) in removing three specific emerging contaminants: caffeine, atrazine, and phenytoin, which were selected based on their persistence and ubiquity …

The Analysis And Study Of Power System Designs For Same Polytechnic College In Tanzania, Kevin Lum Hua

Master's Theses

The Mbesese Initiative for Sustainable Development (MISD) is a group aiming to help eliminate extreme poverty in Africa by creating educational opportunity. One project that the group is currently doing is to build Same Polytechnic College (SPC) in Tanzania. As part of the project, this thesis aims to study and analyze the electrical power system and distribution for the college. Based on the projected load profile of the college and high potential for solar generation in Tanzania, several different power systems utilizing local utility AC electricity and/or photovoltaic (PV) DC electricity are explored and simulated for their feasibility and performance. …

Study Of The Effect Of Biowish Aqua On Simultaneous Nitrification And Denitrification In A Membrane Aerated Bioreactor, Joelle Arakaki

Master's Theses

This research entails the investigation of the effects of a bioaugmentation product from BiOWiSH^® called Aqua, referred to as “Aqua” for the remainder of this paper, on the nitrogen removal rate in a membrane aerated bioreactor (MABR). This research was conducted using a MABR design that consisted of a silicone membrane and continuous flow airline with compressed air. The membrane system was designed to supply oxygen, creating an aerated layer at the membrane-biofilm interface and an anoxic layer at the biofilm-water interface. Laboratory experiments were conducted to compare the nitrogen removal rates of natural bacteria alone to natural bacteria …

Effects Of Raceway Pond Water And Nutrient Recycling On Microalgae Production And Harvesting, Christian A. Bowen

Master's Theses

To be environmentally sustainable, algae biofuel production requires extensive recycling of water and nutrients during algae cultivation. Such recycling can be in the form of reuse of external wastewaters, such as from municipal sewers, but, to achieve significant biofuels production, internal recycling at the algae farms is also needed. A potential difficulty with internal recycling is the accumulation of auto-inhibitory compounds in recycled algae pond water. An additional concern is that nutrients in the residuals from algae biofuel manufacturing will be only partly bioavailable. Both these factors can limit the extent of internal recycling. Ultimately, combining external and internal recycling …

Orbital Optimization Of Interplanetary Trajectories With Environmental Perturbations, Eric S. Woods

Master's Theses

For a detailed analysis of orbital optimization, it is desired to incorporate a spacecraft environment model in order to have maximum confidence that the analysis will produce an accurate trajectory. Such a model requires the addition of orbital perturbations, or small forces acting on the spacecraft throughout its trajectory that can eventually accumulate in large distances over time. The optimization method that this thesis is concerned with is STOpS (Spacecraft Trajectory Optimization Suite), a Matlab optimizer created by Timothy J. Fitzgerald that utilizes an Island Model Paradigm with five different optimization algorithms. STOpS was originally built to model trajectories with …

Bird Abundance At Bird Feeders In Response To Temperature, Wind Speed And Precipitation During The Winter Season, Siddhant Kahal

Master's Theses

The goal of this project is to explore how 23 different bird species respond to 3 climatic attributes. These attributes are lower than average temperatures, wind speed and precipitation level. Information about the bird species and all of the data associated with them is provided by Project FeederWatch (PFW). This is a citizen based survey study that provides key information about bird species abundance through the use of backyard and community feeders. The study volunteers from across the United States and Canada monitor these bird feeders and note important information about the species such as the number of individuals seen. …

The Gods Have Taken Thought For Them: Syncretic Animal Symbolism In Medieval European Magic, Solange Nicole Kiehlbauch

Master's Theses

This thesis investigates syncretic animal symbolism within medieval European occult systems. The major question that this work seeks to answer is: what does the ubiquity and importance of magical animals and animal magic reveal about overarching medieval perceptions of the world? In response, I utilize the emerging subfield of Animal History as a theoretical framework to draw attention to an understudied yet highly relevant aspect of occult theory and practice. This work argues that medieval Europeans lived in a fundamentally “enchanted” world compared to our modern age, where the permeable boundaries between physical and spiritual planes imbued nature and its …

Polycommit: Building Better Habits Through Gamification, Elliot Fiske

Master's Theses

Computer-assisted learning is older than Turing machines, and constantly evolves as technology improves. While some teachers are resistant to using technology in the classroom, “e-learning” techniques are becoming more common in almost every school, from K-12 to universities. As technology becomes more widespread, it becomes crucial to examine the various methodologies of computer-assisted learning and find the techniques that are most effective.

This paper explores the effectiveness of one such methodology, spaced repetition. This technique applies to homework assignments available to students online. We include an exploration of several existing apps that use this technique, and introduce our own novel …

Dynamics Simulation And Optimal Control Of A Multiple-Input And Multiple-Output Balancing Cube, Felix K. Haimerl

Master's Theses

This thesis document outlines the development of a multibody dynamics simulation of an actively stabilized multiple-input, multiple-output, coupled, balancing cube and the process of verifying the results by implementing the control algorithm in hardware. A non-linear simulation of the system was created in Simscape and used to develop a Linear Quadratic Gaussian control algorithm. To implement this algorithm in actual hardware, the system was first designed, manufactured, and assembled. The structure of the cube and the reaction wheels were milled from aluminum. DC brushless motors were installed into the mechanical system. In terms of electronics, a processor, orientation sensor, motor …

Neuro-Silicon Interface Of A Hirudo Medicinalis Retzius Cell Integrated With Field Effect Transistor, Kurt Christian Sjoberg

Master's Theses

The focus of this thesis was to measure the intracellular voltage of a living neural cell using a silicon transistor. The coupling of neurological tissues with silicon devices is of interest to the fields of neurology, neuroscience, electrophysiology and cellular biology. In previous work by Peter Fromherz, single neurons were successfully coupled to transistors [1]. This thesis aims to show proof of concept of the fabrication of a simple neuro-silicon interface using wafer processing methods currently available at Cal Poly. The types of transistors and cells used, the methods for dissecting and preparing the cells, the electrophysiology methods for validating …

Validation Of A 1d Algorithm That Measures Pulse Wave Velocity To Estimate Compliance In Blood Vessels, James Leung

Master's Theses

The purpose of this research is to determine if it is possible to validate the new 1D method for measuring pulse wave velocity in the aorta in vivo and estimate compliance. Arterial pressure and blood flow characterize the traveling of blood from the heart to the arterial system and have played a significant role in the evaluation of cardiovascular diseases. Blood vessel distensibility can give some information on the evolution of cardiovascular disease. A patient’s aorta cannot be explanted to measure compliance; therefore we are using a flow phantom model to validate the 1D pulse wave velocity technique to estimate …

Investigation On The Dissociative Photoionization Mechanism Of Furfural, Investigation Of The Absolute Photoionization Cross Sections Of Three Potential Propargylic Fuels, And Ab Initio Analysis On Potential Superbases Of Several Hyperlithiated Species: Li3f2o And Li3f2(Oh)N (N = 1, 2, 3), Matthew Winfough

Master's Theses

This thesis presents the study photoionization cross sections of three different propargylic biofuels; dipropargyl ether, propargyl alcohol, and propargylamine, in chlorine radical-initiated combustion experiments at the Chemical Dynamics Beamline (9.0.2) at the Advanced Light Source of the Ernest Orlando Berkeley National Laboratory in Berkeley, California. Additionally, the unimolecular dissociative photoionization mechanism of furfural was studied using photoelectron photoionization coincidence (PEPICO) spectroscopy at the vacuum ultraviolet beamline at the Swiss Light Source of the Paul Scherrer Institut in Villigen, Switzerland. Dissociation products and mechanisms for furfural were identified over a photon energy range of 10.9 to 14.5 eV. Lastly, a study …

Bi Or Multilingualism And Its Curriculum For Children With Sli, Jeongmin Ryou

Master's Theses

The purpose of this project, which is based on SLI children age 3-6, is to inspect the possibility of bi- or multilingualism on SLI children and to create a curriculum, which consists of six modules, accordingly. It includes a variety of visual and auditory materials for each module, offers well-tailored daily lesson, and helps children with SLI learn the target language simply and easily. This project provides tips for teachers and can be also referenced when a teacher creates his or her own curriculum. Each module is flexible and should be tailored to the individual, while also being facilitated to …

Crosslinguistic Influence Of Chinese Efl Learners On English Acquisition, Weijia Tang

Master's Theses

This thesis introduces both positive and negative crosslinguistic influence of Chinese EFL learners on English Acquisition. Most Chinese EFL learners have difficulties in English acquisition due to the negative crosslinguistic influence caused by the differences between mother tongue and the target language. In order to help Chinese EFL learners to tackle this problem, comparative analysis is done between English and Mandarin Chinese in terms of phonetics and phonology, morphology, part syntax, and pragmatics.

The focus of this thesis is to investigate both the positive and negative crosslinguistic influence phenomena in the process of English acquisition conducted by Chinese EFL learners …

Boosting Demand For Biofortified Foods: The Case Of Orange Fleshed Sweet Potato Bread In Tamale, Ghana, Tchassanty Ouro-Gbeleou

Master's Theses

Abstract: In the context of introducing biofortification of staple crops as a food-based approach to combat micronutrient malnutrition in Sub Saharan Africa (SSA), we carried out a survey in Tamale, Ghana to elicit consumers’ preference of and willingness to pay for one of the highly nutritious biofortified staple crop processed product: the Orange Fleshed Sweet Potato (OFSP) bread. Our results indicate that scores of respondents in the sample show preference for OFSP bread. The most important determinants of OFSP bread preference are its sweet taste and soft texture and consumers are willing to pay 0.634 pesewas more for the attribute …

An Economic Valuation Of Biodiversity: Measuring Willingness-To-Pay For Quinoa Conservation In Peru, Craig Scott

Master's Theses

Peru is facing increasing homogenization of traditional crops as a result of international market pressures. Destruction of the genetic resource base creates vulnerability to disease, climate, and pest shocks which threaten food security and the economic future of Peru’s agricultural sector. This paper aims to determine whether informational priming on the non-market value of national identity is sufficient to change the willingness to pay for agro biodiversity programs among the Peruvian general population in both urban and rural areas. A choice set willingness to pay experiment combined with choice rankings and randomized priming measures how much individuals are willing to …

Patriarchal Norms, Bargaining, And Gendered Attitudes On Intimate Partner Violence, Anna Eckenrode

Master's Theses

How do the underlying mechanisms of social norms and bargaining power relate to the acceptance of intimate partner violence within households? How do short run and long run determinants of gender norms affect attitudes toward IPV? This study begins to decompose the dynamics of the acceptance of IPV within couples using data from the Demographic Health Survey, as well as examine the relationship in the context of patriarchal societies using data from the Ethnographic Atlas. I find that females are more accepting than males of intimate partner violence, and females becoming more educated is associated with her being less accepting …

“Unwanted In My Own Country”: Testimonies Of Identity And Belonging-Negotiations In A Post-Trump America, Nadia Naghedi Baradaran Hajjar

Master's Theses

This research investigates the impact of Donald Trump’s campaign during the 2016 presidential elections and the so-called, “Muslim” Travel Ban presidential executive orders, on communities of first and second-generation Middle Eastern, Muslim immigrant women in the Los Angeles area, and it is framed within the context of post 9/11-biases and racial discrimination. The ethnographic-like methodology for this research has been conducted with the use of 11 semi-structured in-depth interviews from 2017 that have been transcribed and coded. Findings from the interview data shows that there is a varied amount of responses from the 2016 Presidential Elections and travel ban, however, …

Country Risk And Agricultural Productivity: An Efficiency Study, Tosin Babatunde

Master's Theses

Do the social, economic and political environment in a country affect agricultural efficiency? We address this question by estimating a stochastic frontier model of agricultural productivity in 138 countries from 1984 to 2013. By observing how the business condition, level of social harmony and quality of government in a country affect agricultural inefficiency, we find there to be a positive effect. However, land quality as quantified by percentage of land irrigated, and openness to global trade have a more positive effect on decreasing agricultural productivity. We also find that consistent with literature, former British colonies exhibit higher technical efficiency.

Seeing Red: Analyzing Iucn Red List Data Of South And Southeast Asian Amphibians, Alexandra Gonzalez

Master's Theses

In the midst of the sixth mass extinction event which is currently underway, it appears that amphibians are one of the most impacted vertebrates. Over 6,500 amphibian species are listed on the IUCN Red List (an assessment tool which provides species’ conservation status, perceived threats, and distribution range). While it is well-known that populations under multiple stressors are more likely to undergo significant declines, there are little to no resources available for visualizing how these threats may work synergistically and interact within a species’ range. This is especially the case for Southeast Asian amphibians, which much less attention has been …

Impact Of Innovative Menstrual Technology And Awareness On Female Empowerment Outcomes In Rural Nepal, Anjali Limbu

Master's Theses

In developing countries, menstruation poses two significant challenges for females. First, the resources required for periods are expensive for those in low-income communities. Hence, the absence of such menstrual products lowers females’ access to schooling and employment. Next, periods are also heavily stigmatized – especially in poorer or rural areas. Such taboos surrounding menstruation negatively impacts females’ psychological development and hamper their prospects of socialization. Thus, to analyze this issue, we ran a randomized control trial in Nepal, where we provided reusable menstrual pads and / or health seminar to 312 schoolgirls and 100 of their mothers. Our outcomes demonstrate …

What’S At Steak? The Political Discourse Of Emissions Intensity And Implications Of Animal Agriculture, Kalyn Simon

Master's Theses

This thesis analyzes the international discourse of greenhouse gas emissions in relation to livestock production. Specific government ministries, research institutes, and multilateral organizations are framing a new strategy to mitigate emissions by using emissions intensity metrics. Emissions intensity is a ratio comparing emissions produced per unit of animal product as oppose to measuring absolute emissions. This research is acknowledged as a win-win scenario which allows for a reduction of greenhouse gas emissions while continuing production more efficiently. This thesis outlines the emergence of this metric in international discourse and the implications this shift has on the livestock sector globally. Ultimately, …

Violence Et Liberté : La Période Coloniale Chez Frantz Fanon, Charlotte Dutournier

Master's Theses

No abstract provided.

Encoding Of Episodic Context With Abstract And Concrete Concepts, Charles Davis

Master's Theses

In theories of grounded cognition, abstract concepts, like concrete ones, are grounded in our experiences with the world. However, rather than emphasizing the sensorimotoric aspects of our experience as they do for concrete concepts (e.g., coffee), grounded theories emphasize situational and internal factors for the representation of abstract concepts (e.g., decision). Despite some success in showing that situational and internal factors are important for abstract concepts, a mechanism by which such contextual factors are encoded and re-instantiated with the concept has yet to be elucidated. The present study sought to make headway on finding such a mechanism by …

Mindfulness And Implicit Political Intergroup Bias, Joel Devonshire

Master's Theses

As a conceptual replication of Tincher, Lebois, and Barsalou (2016), I investigated the effects of a brief mindfulness intervention on two measures related to intergroup bias: language abstraction and the differential attribution of uniquely-human emotions to different groups. In Experiment 1, 207 politically liberal or conservative participants were randomly assigned to a mindful attention, immersed attention, or no instruction condition. Participants were exposed to a series of visual and auditory stimuli, including several pictures of valenced behavior performed by an ingroup or an outgroup member. They were also asked to indicate which emotions are characteristic of typical ingroup and outgroup …

The Effect Of Participant Gender And Exposure To Social Embarrassment Messages On Evaluations Of Binge Drinking Messages, Seth Mccullock

Master's Theses

No abstract provided.

Comparison Of Otus And Asvs In 73 Bird Species From Equatorial Guinea, Darien Capunitan

Master's Theses

As scientists discover more information about the communities of bacteria that live on and inside hosts, "the microbiome", a new avenue for understanding the health of humans and animals has opened. There are many analysis pipelines for microbiome data processing, and choice of analytical tools can affect the biological results of the analysis. The current analysis climate does not point toward a single most effective protocol, which hinders comparisons across studies. An important step in microbiome data processing is the assignment of reads into groups of similar organisms. The traditional unit for grouping organisms is the species; however resolving sequences …

Telomerase Activator 65 (Ta-65) Favorably Affects Parameters Of Metabolic Syndrome - A Pilot Study, Minu Sara Thomas

Master's Theses

Abstract

Background: Telomerase Activator 65 (TA-65), a compound extracted from Astragalus membranaceus, was developed to increase or maintain telomere length. Objectives: To determine the effects of TA-65 on the parameters of metabolic syndrome (MetS). Methods: We recruited 40 patients aged 32-70 years with MetS to determine the effects of TA-65 on dyslipidemias and anthropometrics in this at-risk population. This was a double-blind, randomized crossover design in which patients were allocated to consume either 16 mg daily of a TA-65 supplement or placebo for 12 weeks. Following a 3-week washout, participants were allocated to the alternate treatment for an …

Conferring Diva Capability To A Commercially-Available Csfv Elisa: A Double-Competition Approach, Yuxiang Wang

Master's Theses

No abstract provided.