Digital Commons Network^™

Comparison And Design Of Simplified General Perturbation Models (Sgp4) And Code For Nasa Johnson Space Center, Orbital Debris Program Office, Nicholas Z. Miura

Master's Theses

This graduate project compares legacy simplified general perturbation model (SGP4) code developed by NASA Johnson Space Center, Orbital Debris Program Office, to a recent public release of SGP4 code by David Vallado. The legacy code is a subroutine in a larger program named PREDICT, which is used to predict the location of orbital debris in GEO. Direct comparison of the codes showed that the new code yields better results for GEO objects, which are more accurate by orders of magnitude (error in meters rather than kilometers). The public release of SGP4 also provides effective results for LEO and MEO objects …

A Strategy Oriented, Machine Learning Approach To Automatic Quality Assessment Of Wikipedia Articles, Gabriel De La Calzada

Master's Theses

This work discusses an approach to modeling and measuring information quality of Wikipedia articles. The approach is based on the idea that the quality of Wikipedia articles with distinctly different profiles needs to be measured using different information quality models. To implement this approach, a software framework written in the Java language was developed to collect and analyze information of Wikipedia articles.

We report on our initial study, which involved two categories of Wikipedia articles: ”stabilized” (those, whose content has not undergone major changes for a significant period of time) and ”controversial” (articles that have undergone vandalism, revert wars, or …

The Benefit Of Foliar Applied Copper Fertilizer On Romaine Lettuce Grown In Low Copper Soils Of The Coastal Santa Maria, California, Emmy R. Williams

Master's Theses

The importance of trace elements nutrients to vegetable crops has received more attention in recent years. Accordingly this experiment investigated the benefit of foliar applied copper fertilizer on romaine lettuce (Lactuca Sativa Longifolia) grown in low soil Copper (Cu) concentration in the coastal Santa Maria, California. The various rates of Cu fertilizer applied include untreated (control), 100, 200, 400 and 800 grams per acre of CuSO4.5H 2O, using a one time and a split application methods. Three consecutive individual experimental fields were established starting in late spring through the fall of 2008. The soil texture was a loam in all …

The Development And Pilot Of A Culinary Intervention Designed Using The Social Cognitive Theory To Teach Nutrition To Adolescent Girls, Julie Anne Chessen

Master's Theses

In the past 20 years, the way in which food is prepared has rapidly changed. Convenience has become a way of life and Americans have replaced meals made from scratch with meals that are quick and easy. During that time, body mass index has risen steadily. The prevalence of overweight and obesity among children has become common in the American population. “Pink Chefs,” a six-week culinary intervention for middle school girls 12 to 14-years-old, was developed and piloted to combat childhood obesity by teaching nutrition through basic cooking skills. The social cognitive theory was used as the theoretical framework. The …

Bottom-Up Ontology Creation With A Direct Instance Input Interface, Charles C.H. Wei

Master's Theses

In general an ontology is created by following a top-down, or so called genus-species approach, where the species are differentiated from the genus and from each other by means of differentiae [8]. The superconcept is the genus, every subconcept is a species, and the differentiae correspond to roles. To complete it a user organizes data into a proper structure, accompanied with the instances in that domain in order to complete the construction of an ontology. It is a concept learning procedure in a school, for example. Students first learn the general knowledge and apply it to their exercise and homework …

Development Of An Imager System Optimized For Low-Power, Limited-Bandwidth Space Applications, Kalia R. Glassey

Master's Theses

A relatively new picosatellite standard, CubeSats have traditionally been used for simple educational missions. As CubeSats become more complex and utilize more complex sensors such as imagers, they gain enhanced credibility as satellite platforms.

Imaging systems on CubeSats have the potential to be used for a variety of uses, such as earth and weather monitoring, attitude determination, and remote sensing. However the size and power limitations of CubeSats pose an interesting challenge to the design of a capable, robust imaging system.

This thesis outlines the objectives and requirements of CP-3’s imaging system, and describes the development process and methods. Test …

The Effect Of The Fastener Of Different Configuration Composite Panels On Failure Analysis, Robert Austin

Master's Theses

This study presents the effect of the stacking sequence and fiber orientation on a composite sandwich panel subjected to static in-plane bolt loading. Six plates were constructed with laminates of unidirectional carbon fiber and cross ply weaves of fiberglass. The orientations that were examined included 0, +/- 45, and 90 degrees. Half of the plates had fiberglass lamina on the outside of the laminate while the other three plates had the carbon fiber on the outside. Experimental and analytical tests were performed to determine the best orientations and stacking sequence.

For the numerical analysis, plates with fibers oriented at +/- …

Simultaneous Nitrification And Denitrification Of Wastewater Using A Silicone Membrane Aerated Bioreactor, Kirk Hjelte Waltz

Master's Theses

The purpose of this thesis is to investigate the use of a single reactor to biologically treat wastewater by simultaneously oxidizing ammonia, and reducing nitrate and nitrite. The Environmental Protection Agency (EPA) places strict discharge restrictions on these compounds due to their inherent toxicity to humans, wildlife, and ecosystems. The use of a simultaneous system can assist the conventional wastewater treatment technology that requires separate systems, by creating a system that needs less time and smaller size to reach effluent requirements. To conduct this research, a bench-scale membrane aerated biofilm reactor was built using silicone tubing for aeration. Batch and …

Shielding Effectiveness Of Superalloy, Aluminum, And Mumetal Shielding Tapes, Cindy Suit Cheung

Master's Theses

Using MIL-HDBK-419A, MATLAB and Nomographs, Shielding Effectiveness for the Magnetic Field, Electric Field, and Plane Wave were calculated over a frequency range from 10 Hz to 1 GHz. The three shielding tapes used included superalloy, aluminum, and mumetal. Calculations for Shielding Effectiveness involve the computation of Absorption Loss, Reflection Loss, and Re-Reflection Correction Factor. From the outcome of the calculations, it was suitable to conclude that all three metals fulfill the 40 dB Shielding Effectiveness requirements for SGEMP fields for frequencies greater or equal to 1 MHz. Accordingly, all three shielding tapes provide at least 40 dB of shielding to …

The Effect Of Random, Blocked, And Transition Practice Schedules On Children's Performance Of A Barrier Knockdown Test, Gregory C. Snider

Master's Theses

The purpose of this research was to examine whether a transition schedule of contextual interference facilitated learning in retention and transfer equal to or better than random and blocked schedules among children. The author selected participants from the central coast of California and from youth activity leagues. The author selected children between the ages of 10 to 13 with a mean age of 11.5. There were a total of 36 subjects, half male and half female. Unfortunately, due to computer error, only data from 15 subjects were saved and available for analysis. Researchers randomly assigned participants to one of three …

The Effects Of Alterations To Upper Limb Inertial Properties On Vertical Point-To-Point Movement, Adrian K. Hongo

Master's Theses

Purpose: Several studies have examined intralimb coordination between the shoulder and elbow joints during target-oriented movements. These studies have observed consistent patterns in coordination despite changes in movement variables such as speed, direction, and inertia. Researchers used intersegmental dynamics to quantitatively analyze these patterns between shoulder and elbow joints while systematically changing values of these movement variables. Some studies have examined central nervous system adaptations to inertial changes at the elbow and entire arm during a movement, but none have examined inertial changes to the upper limb. Methods: Five male and five female participants aged 27 to 39 years (mean …

Phytoremediation Of Weathered Petroleum In Groundwater By Arroyo Willows In Nutrient Amended On-Site Mesocosms, Sarah E. Bragg-Flavan

Master's Theses

PHYTOREMEDIATION OF WEATHERED PETROLEUM IN GROUNDWATER BY ARROYO WILLOWS IN NUTRIENT AMENDED ON-SITE MESOCOSMS

SARAH BRAGG-FLAVAN

A large-scale mesocosm study was conducted to determine if vegetation with willow trees enhances biodegradation and to evaluate the mechanisms of natural biodegradation of weathered petroleum compounds under field conditions. The mesocosms were designed to model conditions at a former oil field where mid-range petroleum distillates were used as a diluent for pumping crude oil contaminated the soil and groundwater at the site with petroleum compounds. Ten mesocosms were constructed at the field site using un-impacted soil and diluent-impacted groundwater from the site. Five …

Impacts Of Delayed Drawdown On Water Quality And Aquatic Biota In Seasonal Wetlands Of The Grassland Ecological Area, Los Banos, California, Kyle Nathan Poole

Master's Theses

The 178,000-acre Grassland Ecological Area in California’s San Joaquin Valley is managed to provide overwintering habitat to waterfowl on the Pacific Flyway. The major management activity is the fall flooding and spring drawdown of wetlands, timed to optimize the availability of forage vegetation and invertebrates for ducks and shorebirds. Wetland drainage contains salt, boron, and trace elements that are, in part, derived from imported surface water but also concentrate during storage in the wetland impoundments. The spring drawdown drainage contributes to occasional water quality violations in the San Joaquin River (SJR) during dry years. Compliance with water quality objectives may …

Optimization Of Gan Laser Diodes Using 1d And 2d Optical Simulations, Sean Richard Keali'i Jobe

Master's Theses

This paper studies the optical properties of a GaN Laser Diode (LD). Through simulation, the GaN LD is optimized for the best optical confinement factor. It is found that there are optimal thicknesses of each layer in the diode that yield the highest optical confinement factor. There is a strong relationship between the optical confinement factor and lasing threshold—a higher optical confinement factor results in a lower lasing threshold. Increasing optical confinement improves lasing efficiency. Blue LDs are important to the future of lighting sources as they represent the final color in the RGB spectrum that does not have a …

Arteriogenic Revascularization Does Not Induce Vascular Function Impairment, Matthew David Yocum

Master's Theses

Functional hyperemia and arteriolar vasodilation are impaired with chronic ischemia. We sought to examine the impact of chronic ischemia on collateral artery function. For this we used two hindlimb ischemia models to dissect the impact of different repair processes on collateral function. Ligation of the femoral artery increases shear stress in the muscular branch and results in outward remodeling and arteriogenesis. In contrast, resection of the femoral artery proximal to the muscular branch induces blood flow divergence and neutral remodeling along with expectedly greater hypoxia and inflammation. On day 14 after each surgery the diameter of the muscular branch was …

A System For Measuring The Lift And Drag Forces Of A Spinning Golf Ball Held Fixed Within A Wind Tunnel, Ryan R. Miller

Master's Theses

A system was designed, built and tested in order to test the aerodynamic properties of a standard golf ball in a wind tunnel manufactured by ELD, Inc. model 406(B). The system consists of a rotating shaft, on which the golf ball is attached, connected to a two-axis force transducer. Additionally, an automated data acquisition system was built for enhanced precision of measurements. Data for wind speeds up to 160 ft/s and rotational speeds up to 8,600 rpm were obtained and analyzed. The purpose of the designed apparatus was to allow for studies to better understand the lift and drag coefficients …

A Multi-Model Assessment Of Stereotype Content Of Three Latino Groups, Sandra Villalpando

Master's Theses

The proposed research study deals with Latino groups' stereotypes, the content that makes up those stereotypes, and the effects the stereotypes have on Latinos' general well-being. This project investigates the origins of stereotype content using a general theory of stereotype content that is composed of two theories: social role theory (Eagly et al., 2000) and the stereotype content model (Fiske et al., 2003; Fiske et al., 1999). Short questionnaires on three different Latino groups in American society were completed by non-Latino respondents in the Chicago area, and an extended questionnaire on Latino groups was completed by Latino respondents in the …

Are We All Together? : A Study Of Evacuation And Sheltering Of Public Safety Special Needs Populations In The Commonwealth Of Virginia, Anna M. Mcray

Master's Theses

Events thousands of miles away from Virginia have led to enhancements of the existing evacuation and emergency sheltering planning, highlighting the need to consider more than traditional special needs populations. Updated state-level plans specifically address the medical needs of evacuation populations. Pets were taken into consideration and inclusion of dogs, cats, and birds in traditional sheltering planning has begun. Planning began to address those with social needs such as low-income families who may not be able to evacuate until the final hours of an active evacuation. It became clear that there were specific populations that had not been included in …

The Unjust Selection Of Justice Professionals: Balancing Fairness For Police Officer Applicants And The Potential Citizens They Will Serve, Robert W. Boyle

Master's Theses

This paper examines the effects on the community when its police officers are held to different physical standards based upon their sex. Through a Platonic analysis of the modern day "guardians of the city," it can be seen that the community is deprived of the strongest and best police force when the department compensates individuals based upon a "weakness" that thier class of applicants possesses. This process proves to be unfair to both the applicants and to the citizens they may subsequently serve.

Nano-Mechanics Of Cartilage Glycosaminoglycans Using Molecular Dynamics Methods, Kevin Neil Hendrickson

Master's Theses

Articular Cartilage (AC) is the main load carrying material in synovial joints {Hamerman, 1962} and degeneration of AC can cause pain in the form of arthritis. Current work is centered on the method of replacing damaged cartilage inside the body (in vivo) with tissue engineered outside the body (ex vivo) {Temenoff, 2000}. In order to engineer tissue ex vivo similar to the native tissue in structure and function there must be a comprehensive understanding of the mechanical properties of AC. This work focuses on the study of glycosaminoglycans (GAGs), a molecule known to be primarily responsible for the compressive stiffness …

Relations Between Language And Executive Function In Spanish-Speaking Children., Ana Luz Portillo

Master's Theses

The literature on the development of executive function (EF) has been largely limited to studies of middle-class English-speaking children. This study extended executive function research to a primarily low socioeconomic status (SES) sample of Spanish-speaking preschool children living in the United States. The purpose of this study was to examine a variety of language measures (vocabulary, grammar, and comprehensive language) in relation to a variety of executive function measures (working memory, inhibitory control, and attention-shifting). Results revealed that Spanish speakers performed on some, but not all, EF measures comparably to higher SES English-speaking peers, in concurrence with previously reported findings. …

Determinants Of Job Satisfaction And Turnover Among Physicians., Dustin Kaplan

Master's Theses

This study examined the determinants of job satisfaction and turnover among physicians at the University of California, San Diego. The relationship between eight predictor variables (administrative requirements, autonomy, ability to provide quality patient care, workload, work/private life conflict, pay, satisfaction with community, locus of control) and two dependent variables (job satisfaction, turnover intentions) was studied. Results indicated physicians' satisfaction with their current position was related to their perceptions of their autonomy, workload, work/private life conflict, pay, and community satisfaction. In addition, all predictors except workload had an impact on physicians' satisfaction with the current career. The only predictor that influenced …

Intrusion Detection And Prevention System: Cgi Attacks., Tejinder Aulakh

Master's Theses

Over the past decade, the popularity of the Internet has been on the rise. The Internet is being used by its clients to access both static and dynamic data residing on remote servers. In the client-server interaction, the client asks the server to provide information, and, in addition, the server may also request that clients provide information such as in "web forms." Therefore, the Internet is being used for many different purposes which also include the web servers collecting the information from the clients. Consequently, attacks on the web servers have been increasing over the years. Due to the fact …

Seafood Labeling And Consumer Behavior: A Fishwise Case Study, Sonoma County, Ca., Alicia Ushijima Elsholz

Master's Theses

Decades of unsustainable commercial fishing have resulted in depletion of fish stocks, destruction of ocean habitats, and unintended capture and death of fish and marine mammals. In addition, unsustainable aquaculture practices threaten wild species and pollute surrounding natural habitats. In an attempt to combat these adverse impacts, FishWise, a seafood labeling program, was created to encourage consumers at health food stores and gourmet markets in the US to purchase seafood caught or farm raised in a sustainable manner. This study evaluates FishWise to determine its effectiveness in educating consumers about sustainable fishery issues and in influencing purchases of sustainable seafood …

Alfred Of Wessex A Study In Accidental Greatness., Maureen Elizabeth Searing

Master's Theses

This thesis examines the application of the epithet "great" to King Alfred of Wessex (r. 871--899). It sets a standard for greatness within the context of early medieval Christian kingship, applies it to Alfred, and then compares Alfred to Charlemagne and Charles the Bald. It traces the development of the cult of Alfred from his own lifetime to the early twentieth century. It examines the mythical achievements of Alfred and how they developed, then summarizes his actual accomplishments, and compares them to the standard for greatness developed in the thesis.

Enhancing Spammer Detection In Online Social Networks With Trust-Based Metrics., Alexander J. Murmann

Master's Theses

As online social networks acquire larger user bases, they also become more interesting targets for spammers. Spam can take very different forms on social Web sites and cannot always be detected by analyzing textual content. However, the platform's social nature also offers new ways of approaching the spam problem. In this work the possibilities of analyzing a user's direct neighbors in the social graph to improve spammer detection are explored. Special features of social Web sites and their implicit trust relations are utilized to create an enhanced attribute set that categorizes users on the Twitter microblogging platform as spammers or …

Frederick Beecher Perkins: Library Pioneer And Curmudgeon., Michael D. Murray

Master's Theses

In the following thesis, I will argue that Frederick Beecher Perkins is an overlooked figure in library history who deserves to be listed among the great library pioneers. Perkins was involved with many of the people, organizations, and major debates that shaped the field of librarianship in the late 1800s. He was associated with such figures as Melvil Dewey and Justin Winsor. He was involved in the critical issues of the day such as best reading, cataloging and classifying books, and administering libraries. He also played a role in important organizations and libraries such as the American Library Association, the …

Analysis Of California Surface Temperature Trends Based On Observations., Wittaya Kessomkiat

Master's Theses

Analysis of California surface temperature based on observations has been conducted using United States Historical Climatology Network (USHCN) stations and Cooperative Weather (COOP) stations throughout California to understand spatial and temporal changes in temperature. Monthly maximum and minimum temperatures (Tmax and Tmin) were used to calculate and analyze annual and seasonal trends over the last 86 years via statistical analyses. For annual trends, Tmin is warming faster than Tmax for both 1918--2006 and 1950--2006 time periods. Since 1970, both Tmax and Tmin, however, have increased at the same rate. For seasonal trends, interestingly, by far the largest warming trends are …

Urban Creek Restoration, Adobe Creek, Santa Clara County, California., Chris D. Pilson

Master's Theses

Increased urban development has encroached upon and impacted Adobe Creek by constricting the route and volume of flow to predetermined corridors, often irrespective of the original creek morphology. The headwaters geology and human influences have contributed to the creek's disequilibrium. Channelization and instream modifications have segmented the creek system limiting the transfer of changes through the system. Located east of the San Andreas fault (SAF) in the Franciscan Complex, Adobe Creek flows from the eastern foothills of the Santa Cruz Mountains and empties into the San Francisco Bay.

Investigation Of The Origins Of Prospective Memory Under Various Cognitive Loads., Sarah V. Ligda

Master's Theses

This thesis examined if prospective memory ability was selected for increased survival skills under a specific cognitive load level. Two-hundred seventy San Jose State University students under the age of 35 participated in this study that manipulated prospective memory type and cognitive load level and that employed a novel ratio scale measurement. Prospective memory performance was found to be more expeditious in the survival-based condition, F(1, 176) = 5.41, p=.02 and high cognitive load condition, F(1, 176) = 5.41, p=.02 for those that execute prospective memory tasks directly after recalling those tasks at the appropriate time. No difference was found …