Digital Commons Network^™

Cfd Study Of Taylor-Like Vortices In Swirling Flows, Sattar Panahandehgar

Doctoral Dissertations and Master's Theses

Swirling flows are complex fluid motions that appear in various natural phenomena and man-made devices. Numerous engineering applications such as turbomachinery, jet engine combustion chambers, mixing tanks and industrial burners involve swirling flows. This wide range of applications is due to unique characteristics offered by swirling flows such as increase in mixing rate, heat transfer rate and wall shear stress. In this study the axisymmetric swirling flow behavior in the context of a hybrid rocket engine have been analyzed. While modeling the flow inside a cylindrical chamber using CFD, a similarity with the Taylor vortices instability has been observed. Similar …

Covering Shock Wave Induced Interfacial Mixing: Numerical Study And A Control Primer, Erik S. Proaño

Doctoral Dissertations and Master's Theses

This document is aiming toward deepening the understanding of the phenomena of mixing and the effect of the initial conditions in the cylindrical & spherical Richtmyer-Meshkov and Rayleigh-Taylor Instabilities. This work is focused on identifying the most energetic structures of the ow in order to define a reduced order model intended for modeling the evolution of the mixing layer after reshocking the density interface. Initially, Simulations are implemented for the two dimensional case of a cylindrical shock wave convergently approaching an initially wave-like perturbed density discontinuity formed by a target of Sulfur Hexauoride immersed into unshocked air with Atwood number …

Low-Tip-Speed High-Torque Proprotor Noise Approximation For Design Cycle Analysis, Xavier G. Santacruz

Doctoral Dissertations and Master's Theses

Noise reduction in aviation would enable urban missions that cannot be own with current generation helicopters because of their noisiness. This goal can be achieved by using electric motors as they are quieter and can produce higher torque at lower RPMs. Therefore, a proprotor system can be designed to exploit this characteristic potentially abating noise levels. This research performed noise approximations included with rotor aerodynamics for a single, electric-driven, hovering proprotor by creating a code meant to be used in design cycle analysis. The approximation was based on geometry by using the blade element momentum theory, and calculating the pressure …

Optimal Battery Weight Fraction For Serial Hybrid Propulsion System In Aircraft Design, Tsz Him Yeung

Doctoral Dissertations and Master's Theses

This thesis focuses on electric propulsion technology associated with serial hybrid power plants most commonly associated with urban air mobility vehicles. While closed form analytical solutions for parallel hybrid aviation cases have been determined, optimized serial hybrid power plants have not seen the same degree of fidelity. Presented here are the analytical relationships between several preliminary aircraft design objectives and the battery weight fraction. These design objectives include aircraft weight, range, operation cost, and carbon emissions. The relationships are based on a serial hybrid electric propulsion architecture from an energy standpoint, and can be applied to hybrid aircraft of different …

A Hybrid Vortex Solution For Radial Equilibrium In Axial Compressors, Wenyu Li

Doctoral Dissertations and Master's Theses

A hybrid vortex solution using the radial equilibrium equation for three dimensional design in axial compressors is generated. One of the most common used vortex solutions is Free Vortex. However, it ignores the fact that axial velocity varies with radius. The Hybrid Vortex includes axial velocity distribution with radius, which gives a more effective design. A single stage is first designed using the Free Vortex design method. A low hub-to-tip ratio is set to ensure subsonic flow. The axial velocity profile is exported from the CFX solver of the inlet diffuser. Using the Hybrid Vortex solution to the radial equilibrium …

Hypervelocity Impact Analysis Of Hybrid Nanocomposite Sensors For Inflatable Space Structures, Yachna Gola

Doctoral Dissertations and Master's Theses

Future space exploration requires easy-to-transport, and easy-to-build and deploy space habitats. NASA and Bigelow Aerospace have collaborated so that human habitation can be made safe and easy with inflatable space habitats (Litteken, 2017). One of the biggest threats faced by these structures in outer space is impact damage by micrometeoroid orbital debris (MMOD) traveling at velocities as high as 15 km/s (Lemmens, Krag, Rosebrock, & Carnelli, 2013). This work presents fabrication and testing of hybrid nanocomposites with carbon nanotubes (CNT) and coarse graphene nanoplatelets (GNP) as fillers and flexible epoxy matrix, that are proposed to be used for sensing the …

Space Image Processing And Orbit Estimation Using Small Aperture Optical Systems, David Zuehlke

Doctoral Dissertations and Master's Theses

Angles-only initial orbit determination (AIOD) methods have been used to find the orbit of satellites since the beginning of the Space Race. Given the ever increasing number of objects in orbit today, the need for accurate space situational awareness (SSA) data has never been greater. Small aperture (< 0:5m) optical systems, increasingly popular in both amateur and professional circles, provide an inexpensive source of such data. However, utilizing these types of systems requires understanding their limits. This research uses a combination of image processing techniques and orbit estimation algorithms to evaluate the limits and improve the resulting orbit solution obtained using small aperture systems. Characterization of noise from physical, electronic, and digital sources leads to a better understanding of reducing noise in the images used to provide the best solution possible. Given multiple measurements, choosing the best images for use is a non-trivial process and often results in trying all combinations. In an effort to help autonomize the process, a novel “observability metric” using only information from the captured images was shown empirically as a method of choosing the best observations. A method of identifying resident space objects (RSOs) in a single image using a gradient based search algorithm was developed and tested on actual space imagery captured with a small aperture optical system. The algorithm was shown to correctly identify candidate RSOs in a variety of observational scenarios.

Finding The Symmetry Group Of An Lp With Equality Constraints And Its Application To Classifying Orthogonal Arrays, Andrew J. Geyer, Dursun A. Bulutoglu, Kenneth J. Ryan

Faculty Publications

Excerpt: For a given linear program (LP) a permutation of its variables that sends feasible points to feasible points and preserves the objective function value of each of its feasible points is a symmetry of the LP. The set of all symmetries of an LP, denoted by G^LP, is the symmetry group of the LP. Margot (2010) described a method for computing a subgroup of the symmetry group G^LP of an LP. This method computes G^LP when the LP has only non-redundant inequalities and its feasible set satisfies no equality constraints.

Law And The Future Of A Free Press, David D. Meyer

Faculty Scholarship

No abstract provided.

Enhancing Patient Medication Knowledge: Utilizing An Educational Tool To Improve Patient Satisfaction Scores, Elizabeth Orgon

Master's Projects and Capstones

The Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) survey has recognized the need for medication education with communication about medication as a patient satisfaction indicator. Literature shows a medication guide or tool that is readily accessible and easy to understand for the patient can help provide nurses with a teach back method to help increase patient knowledge about common medications. Continued use of this tool will then positively affect communication between patients and providers thereby increasing medication communication related HCAHPS survey scores. Review of current Stanford Health Care HCAHPS survey data shows that all nursing units are continually …

Characteristics Of Horizontal Precipitation In Semi-Humid Forestland In Northern China, Jianbo Jia, Wende Yan, Xiaoyong Chen, Wenna Liu

Faculty Authors and Creators Reception 2025

Little information is available on horizontal precipitation in forest land in semi-humid climate regions. In this study, the quantity and duration of horizontal precipitation were investigated using the high precision weighing lysimeter system in the mountainous areas of northern China during the experiment year 2011 and 2012. The purpose of this study was to better understand the formation mechanisms of horizontal precipitation in the semi-humid climate region. The results showed that hourly values of horizontal precipitation distributed between 0 and 0.1 mm, and that the one-night values distributed between 0.2 and 0.4 mm. The number of days with horizontal precipitation …

Querying Over Encrypted Databases In A Cloud Environment, Jake Douglas

Boise State University Theses and Dissertations

The adoption of cloud computing has created a huge shift in where data is processed and stored. Increasingly, organizations opt to store their data outside of their own network to gain the benefits offered by shared cloud resources. With these benefits also come risks; namely, another organization has access to all of the data. A malicious insider at the cloud services provider could steal any personal information contained on the cloud or could use the data for the cloud service provider's business advantage. By encrypting the data, some of these risks can be mitigated. Unfortunately, encrypting the data also means …

Effects Of Intention Status And Social Support On Parental Investment, Kayla Downs

Boise State University Theses and Dissertations

According to life history theory, human mothers rely on assistance from others for childrearing help. Studies have shown that mothers who have insufficient support often report having unwanted or mistimed pregnancies. In turn, unwanted pregnancies may lead to reduced parental investment. This study is the first to analyze the interaction between pregnancy intention status and social support to better understand parental investment. Using data from the Millennium Cohort Study of the U.K. which includes over 18,000 respondents, this study examines how planned pregnancy and social support variables – measured as assistance from a partner, family, or friends – is associated …

The Relationship Between Aggression And Depression: Testing The Moderating Effects Of Age And Gender, Benjamin P. Comer

Boise State University Theses and Dissertations

The purpose of this thesis is to a) explore the research related to aggression and depression and b) test hypotheses that focus on the relationship between aggression and depression in relation to age and gender over time. Aggression and depression are discussed extensively by examining a broad range of literature that points to environmental, social, individual, psychological, and biophysiological influences. First, aggression and depression are discussed separately in terms of their underlying theory, biosocial perspectives, typologies, behavioral and personality abnormalities, brain structures related to each, and neurochemical/neurological influences. The final sections of the literature review discuss how aggression and depression …

Novel Low Temperature Cofired Ceramic Manufacturing Techniques For A Magnetron Field Emission Cathode, Daylon Michael Black

Boise State University Theses and Dissertations

Low Temperature Cofired Ceramic (LTCC) is a material system that is ideal for integrated microelectronic packaging technology, because of its rapid prototyping and easy integration of passive components such as resistors, capacitors, and conductors. LTCC’s electrical properties makes it especially suitable for high frequency applications such as magnetrons. Recently, there has been an increased demand for greater power capacities which is resolved by phase locking multiple low power (inexpensive) magnetrons together to achieve the same power as one high power (expensive) magnetron. The Vacuum Electron Devices (VED) and Ceramic Micro Electrical Mechanical Systems (CMEMS) labs at Boise State University have …

Disclosing Romantic Relationship Conflicts With A Third Party: A Test Of The Disclosure Decision-Making Model, Michelle Marie Jimenez

Boise State University Theses and Dissertations

This study utilized Greene’s (2009) health disclosure decision-making model (DD-MM) to better understand the process of romantic relationship conflict (RRC) disclosures to a confidant outside the relationship. In doing so, I investigated the changes in relational quality between the discloser and their romantic partner/confidant, while also proposing that the DD-MM would be valid for use in RRC disclosures. Results indicated that while relational quality does not change significantly between the discloser and their romantic partner/confidant after an RRC disclosure, the depth of disclosure is significantly correlated with greater relational quality with the confidant. The relational quality an individual had with …

Substance Use And Bullying Intervention Among High School Students, April Denise Watts

Boise State University Theses and Dissertations

Comprised of three individual articles, this article-based dissertation investigates the relationship between bullying and substance use among high school students. Chapter One provides an overview of the dissertation’s purpose along with a discussion of the theoretical framework and development of the studies comprising the dissertation. Chapter Two examines the relationship between bullying victimization and substance use among high school students. Findings demonstrate that students who reported bullying victimization reported higher levels of alcohol and illicit drug use, but not marijuana use. Chapter Three is a mixed methods study assessing the appropriateness of an “aged-up” brief bullying bystander intervention (STAC) and …

Wildfire Smoke: Trends, Challenges, Unknowns, And Human Response, Mariah Dawn Fowler

Boise State University Theses and Dissertations

Wildfire smoke is a growing threat to human livelihood in the Western United States. The economic and the health burden of smoke is accelerating in response to a growing fire season and escalating fire activity. This study first evaluates the trends in air quality over Boise, Idaho and the entire Northwest (and Montana) to assess the impacts of wildfire smoke in the region. The Mann-Kendall trend analysis shows that there is a statistically significant trend in the average and maximum air quality index (AQI) during the fire season (July-August-September) in the Boise area. The AQI shows a decreasing trend, although …

Additive Manufacturing Of High Performance Flexible Thermoelectric Generators Using Nanoparticle Inks, Tony Valayil Varghese

Boise State University Theses and Dissertations

Flexible thermoelectric devices are attractive power sources for the growing demand of flexible electronics and sensors. Thermoelectric generators have an advantage due to no moving parts, silent operation and constant power production with a thermal gradient.

Conventional thermoelectric devices are rigid and fabricated using complex and relatively costly manufacturing processes, presenting a barrier to increase the market share of this technology. To overcome such barriers, this work focuses on developing near ambient-temperature flexible thermoelectric generators using relatively low-cost additive manufacturing processes. A screen printable ink was developed for transforming nanoparticle ink into high-performance flexible thermoelectric generators with a peak thermoelectric …

The Art Of Healing: Mary Gove Nichols's Crusade For Women's Wellness, Marnie Nichole

Boise State University Theses and Dissertations

This thesis uses the life of 19^th-century American reformer Mary Gove Nichols to explore antebellum feminism through the lens of health and marriage reform. Using primary sources including the subjects own personal publications, this thesis traces one theme throughout Nichols’s life: her passionate drive to educate women on their own health, and to make such knowledge accessible, so that they could acquire it for themselves. This particular theme manifested in two forms: wellness acquired via homeopathic medicine, specifically the water cure; and wellness acquired from a safe and loving marriage. Her life’s work, an early form of feminism, …

Factors Affecting Patellar Mechanics And Bone Strain In Patients With Crouch Gait, Erika Ramirez

Boise State University Theses and Dissertations

Crouch gait is a musculoskeletal impairment that results in higher than normal stresses at the patellofemoral (PF) joint that can lead to instances of anterior knee pain and loss of ambulation. The impact of commonly implemented surgical procedures to correct for crouch gait can be quantified by evaluating stresses and underlying patellar bone strain during a gait cycle. The aims of this thesis work were (1) to analyze changes in PF mechanics and patellar bone strain between pre- and postoperative conditions; (2) to quantify the variability of predicted patellar strain due to different kinematic/loading profiles or patellar material properties; and …

(111)-Oriented Gallium Arsenide Tensile-Strained Quantum Dots Tailored For Entangled Photon Emission, Christopher Schuck

Boise State University Theses and Dissertations

The use of molecular beam epitaxy (MBE) to create quantum dots (QDs) embedded in solid-state semiconductor media has been at the forefront of novel and record-breaking optoelectronic device development for many years. However, the wide range of semiconductor fabrication capabilities and the non-equilibrium growth parameters inherent to MBE mean that there are still many QD research frontiers that are yet to be explored.

This work focuses on a recently discovered method that permits, for the first time, the growth of QDs under tensile strain on non-(100) surfaces. My research explores the first (and currently only) optically active materials system for …

Variation In The Configuration Of The Middle Snake River And Its Relationship To Prehistoric Fishing Site Locations, Joseph Wardle

Boise State University Theses and Dissertations

The configuration of the various elements of a river system can have significant impacts on the availability, abundance, and nutritional profitability of aquatic organisms utilized as food by groups of human foragers. These factors may have influenced the location and timing of prehistoric fishing along the Middle Snake River in southern Idaho during the Late Archaic when use of fish as a resource increased (beginning approximately 1500 B.P.). Previous work has established a relationship between physiographic features of the Middle Snake River channel and the presence of fishing sites. To improve on future studies of this type, it is important …

Service-Learning In An Introductory Environmental Science Course: How Participation Impacts Course Content Knowledge And Agency, Mari Rice

Boise State University Theses and Dissertations

Service-learning (SL) is a high-impact pedagogical strategy that has been shown to have both cognitive and affective benefits for students and has the potential to engage and involve a more demographically diverse spectrum of students into the field of STEM. However, research on the impacts of SL in STEM courses is limited, and therefore there is a great need to identify the specific outcomes linked to participation. In addition, faculty from STEM fields have been hesitant to incorporate SL into their curriculum due to perceptions that it lacks academic rigor. This purpose of this mixed-methods case study was to examine …

Convergent Evolution And Species Boundaries In Lomatium Species (Apiaceae), Michael Ottenlips

Boise State University Theses and Dissertations

Speciation is a complex and ongoing process caused by a variety of forces; this has in part led to a proliferation of species concepts ranging from arbitrary similarity-based concepts such as the morphological species concept to ancestry-based concepts that incorporate the complex nature of gene inheritance. Ancestry-based concepts rely on homologous characters, either molecular or morphological, that share a common origin in order to draw inferences about evolutionary histories and help understand species boundaries. Convergence in morphology and paralogous loci in molecular datasets can cause confusion in understanding if characters are functionally homologous. Other challenges in inferring species boundaries and …

Gender Differences In The Prevalence Of Mental Health And Substance Abuse Problems Among Detained Juveniles In Idaho, Jessica Marshall

Boise State University Theses and Dissertations

For the past 11 years, the Boise State University’s Center for Health Policy has partnered with the Idaho Department of Juvenile Corrections to analyze data on juveniles entering detention at 13 Juvenile Detention Centers in Idaho. The Alaska Screening Tool (AST) is used to screen juveniles who may or may not meet the criteria for having a mental health problem, substance abuse problem, or both types of problems. The current study explores prevalence rates and gender differences as indicated by the AST for fiscal years 2008-2017. Across nine years of data (fiscal years 2008-2017), on average, 61% of all detained …

Using An Evaluation Capacity Tool To Build Evaluation Capacity In A Nonprofit Organization, Megan Brook Miller

Boise State University Theses and Dissertations

Organizational performance improvement cannot be expected without continuous monitoring and evaluations. Nonprofit organizations (NPOs) funded through government grants and other funder contracts face high expectations for evaluation and reporting of data as they are held accountable to their funders. However, NPOs share common struggles in both measuring and building evaluation capacity, which refers to the ability for an organization to conduct an effective evaluation that meets accepted standards of the discipline (Milstein, Chapel, Wetterhall, & Cotton, 2002). Thus, the purpose of this research was to answer the following research question: How does an NPO use an ECB framework and …

Real-Time Fault Detection And Reconfiguration Of A Three-Phase Electric Motor Drive, Danyal Mohammadi

Boise State University Theses and Dissertations

Variable-frequency drives (VFDs) are widely used for control of electrical machines such as induction motors (IMs) or permanent-magnet synchronous motors (PMSMs). Similar to other electrical devices, these drives are subject to failure. Several types of faults are associated with VFDs. For instance, faults such as an open-switch fault, a short-circuit switch fault are the two common faults in VFDs. These faults can yield catastrophic consequences if proper remedial action is not taken.

A unique remedial topology for the post-fault period and a new pulse width modulation (PWM) strategy are proposed so that not only the motor drive can continue the …

Unicorn Framework: A User-Centric Approach Toward Formal Verification Of Privacy Norms, Rezvan Joshaghani

Boise State University Theses and Dissertations

In the development of complex systems, such as user-centric privacy management systems with multiple components and attributes, it is important to formalize the process and develop mathematical models that can be utilized to automatically make decisions on the information sharing actions of users. While valuable, the current state-of-the-art models are mostly based on enterprise/organizational privacy perspectives and leave the main actor, i.e., the user, uninvolved or with limited ability to control information sharing actions. These approaches cannot be applied to a user-centric environment since user privacy policies are dynamic because they change based on the information sharing context and environment. …

Statutory Interpretation, Administrative Deference, And The Law Of Stare Decisis, Randy J. Kozel

Journal Articles

This Article examines three facets of the relationship between statutory interpretation and the law of stare decisis: judicial interpretation, administrative interpretation, and interpretive methodology. In analyzing these issues, I emphasize the role of stare decisis in pursuing balance between past and present. That role admits of no distinction between statutory and constitutional decisions, calling into question the practice of giving superstrong deference to judicial interpretations of statutes. The pursuit of balance also suggests that one Supreme Court cannot bind future Justices to a wide-ranging interpretive methodology. As for rules requiring deference to administrative interpretations of statutes and regulations, they are …