Digital Commons Network^™

Dynamics And Phase Behavior Of Mixed Antibody-Excipient Adsorption At An Air/Water Interface, Ankit D. Kanthe

Dissertations and Theses

Monoclonal antibodies (mAbs) have become a leading candidate for oncological therapeutics due to their unparalleled selectivity. Monoclonal antibodies are amphiphilic, containing polar and nonpolar amino acid residues on their biomolecular surfaces. Their amphiphilic nature drives mAbs to strongly adsorb to air/water interfaces. Interfacial adsorption presents a central problem to the production and use of antibody-based pharmaceuticals. Air/water interfaces are frequently generated during the manufacture (filtration and chromatography) and production (freezing, thawing, filtration and filling) of the drug product. Moreover, air/water interfaces are present during the storage, transportation and administration of the therapeutics. When an air/water interface is created, the antibodies …

Eco-Friendly Chemical Herders For Remediation Of Maritime Oil Spill, Hao Zhou

Dissertations and Theses

Crude oil spills on a sea surface can cause severe and immediate damage to marine life, as well as long term damage to the aquatic ecosystem. Current response methods for maritime oil spill remediation are twofold: The first are the use of floating barrier booms to confine and thicken the spill slick to smaller areas, where they can be subsequently removed by mechanical skimming or in-situ burning. The second are the use of dispersants which are aerially sprayed onto the slick to emulsify the slick through wave action into smaller droplets that can be dispersed through the water column for …

Computational Fluid Dynamics Simulation Of Rain-Wind-Induced Vibration Of Stay Cables, Hongfan Wang

Dissertations and Theses

Due to the large amplitude, frequent occurrence and severe consequences, the rain-wind induced vibration (RWIV) of stay cables in cable-stayed bridges has been investigated extensively by researchers around the world. However, the underlying excitation mechanism is still unclear. Recently, computational fluid dynamics (CFD) simulation has been widely applied in the research on structure vibrations due to dynamic wind loads, with great potential as an alternative tool for wind tunnel testing. It has also been adopted to investigate the RWIV, but only a few studies have been conducted so far. Furthermore, most of the CFD simulations reported in literatures are two-dimensional, …

Financial Development And Economic Growth, Chiau-Jiun Jiang

Dissertations and Theses

This paper purposes to discuss the relationship between the financial development and economic growth. In the past, most studies related to the influence of financial development on economic growth used cross-sectional analysis or time series analysis. However, the cross-sectional analysis cannot explain the long-term trend of the time series, and the time series is unable to explain the multiple samples of the cross-section. Based on Arellano and Bond (1991), and Arellano and Bover (1995), this paper utilizes the panel data model to discuss financial development and economic growth. The results point out that bank credit in total GDP and capitalization …

Unique Image Representation As A Tensor, Bharat Rosanlall

Dissertations and Theses

This thesis presents a two dimensional orthonormal transform that represents an image as coefficients in 4 independent channels. The salient feature of these coefficients is that they contain complete position spatial frequency information about the image, in a sense that the original image can be reconstructed from these coefficients with negligible error. These coefficients can be used in various machine learning, AI , and other tasks where data features are used. Popular convolutional layer used in various neural networks reduces information and can not reconstruct original image. In this thesis , we present several examples where these coefficients are used …

Adaptive Effort Classifiers: A System Design For Partitioned Edge/Cloud Inference, Divya Sankar

Dissertations and Theses

The massive growth in availability of real-world data from connected devices and the overwhelming success of Deep Neural Networks (DNNs) in many ArtificialIntelligence (AI) tasks have enabled AI-based applications and services to become commonplace across the spectrum of computing devices from edge/Internet-of-Things (IoT) devices to data centers and the cloud. However, DNNs incur high computational cost (compute operations, memory footprint and bandwidth),which far outstrip the capabilities of modern computing platforms. Therefore improving the computational efficiency of DNNs wide-spread commercial deployment and success.In this thesis, we address the computational efficiency challenge in the context ofAI inference applications executing on edge/cloud systems, …

Using Statistical Learning Approaches To Understand Trends And Variability Of Tornadoes Across The Continental United States, Niloufar Nouri

Dissertations and Theses

The annual frequency of tornadoes during 1950-2018 across the major tornado-impacted states were examined and modeled using anthropogenic and large-scale climate covariates in a hierarchical Bayesian inference framework. Anthropogenic factors include increases in population density and better detection systems since the mid-1990s. Large-scale climate variables include El Niño Southern Oscillation (ENSO), Southern Oscillation Index (SOI), North Atlantic Oscillation (NAO), Pacific Decadal Oscillation (PDO), Arctic Oscillation (AO), and Atlantic Multi-decadal Oscillation (AMO). The model provides a robust way of estimating the response coefficients by considering pooling of information across groups of states that belong to Tornado Alley, Dixie Alley, and Other …

Motion Of Janus And Patchy Particles Near Various Boundaries, Zohreh Jalilvand

Dissertations and Theses

Colloidal particles with anisotropic surface properties are an emergent class of novel materials that have been indicated to possess a remarkable potential to still be fully exploited. Among anisotropic colloids, Janus and patchy particles with different compositions and functionalities recently have drawn significant attention in the field of colloid science. They are known as promising candidates to address challenges in various fields such as emulsion stabilization, oil recovery, drug delivery, biosensors and environmental remediation. A majority of the envisioned applications require Janus and patchy particles to operate near boundaries, i.e., a wall or a fluid/liquid interface, which significantly affect the …

On The Energy Sustainability Of Active And Passive Building Integrated Technologies In The Context Of A Changing Climate For Tropical Coastal Cities, Rabindra Pokhrel

Dissertations and Theses

Caribbean Sea surface temperatures have been rising at an alarming rate of 0.020C/year. The effect of rising sea surface temperatures is reflected in increasing in 2m air temperature over the Caribbean. The rise in extreme temperatures increases human discomfort and energy demands for air conditioning (AC) putting both the population and energy infrastructure at higher risk of vulnerability. This vulnerability is amplified in compact cities where anthropogenic heat removal from the built environment further increases the temperature of the urban canyon with feedback on human comfort and energy demands. Although there has been prior work reported on mitigating energy demands …

V-Slam And Sensor Fusion For Ground Robots, Ejup Hoxha

Dissertations and Theses

In underground, underwater and indoor environments, a robot has to rely solely on its on-board sensors to sense and understand its surroundings. This is the main reason why SLAM gained the popularity it has today. In recent years, we have seen excellent improvement on accuracy of localization using cameras and combinations of different sensors, especially camera-IMU (VIO) fusion. Incorporating more sensors leads to improvement of accuracy,but also robustness of SLAM. However, while testing SLAM in our ground robots, we have seen a decrease in performance quality when using the same algorithms on flying vehicles.We have an additional sensor for ground …

Contemporary Art And Food: An Examination Of Three Case Studies Using Anthropology And Diaspora As Key., Viridiana S. Mayagoitia

Dissertations and Theses

Food-related artworks are as crucial to understanding culture as other mediums in art like painting, installation, sculpture, and drawings. From Greek and Roman mosaics, Egyptian banquet scenes, to Renaissance frescoes and Flemish still-life paintings, the depiction of food and meals has had multiple meanings. Food as a medium in Western contemporary art was introduced in the 1930s by the Italian Futurists’ banquets, which celebrated modernity and technology underlying social and political commentary. It continued throughout the 1960s with performance art, conceptual art, and happenings, and in the 1970s with the Fluxus movement’s exploration of the boundaries between art and life. …

Legal Frameworks For Protecting Cultural Heritage In Conflict Zones, Marcie M. Muscat

Dissertations and Theses

Cultural heritage has always been at risk during times of war. UNESCO first endeavored to address the issue shortly after World War II, in 1954, when it passed the first of three signature conventions to protect against the damage, destruction, and pillage of cultural property in times of armed conflict. Lacunae and other deficiencies in their frameworks, however, rendered these conventions difficult to enforce and largely ineffectual. This study offers an assessment of the strengths and limitations of the UNESCO system of cultural-heritage protection, with a particular focus on the 1954 Hague Convention. It is argued that, by superseding certain …

Slender Frp Elements As Discrete Reinforcement For Concrete, Yuan Tian

Dissertations and Theses

This dissertation presents a study that led to the development of slender elements that look like fibers used for reinforcing concrete but with a very different reinforcing mechanism. These elements, referred to as “Needles” are very rigid and strong; when intersected by growing cracks in concrete under heavy and increasing loads, they do not break and deform minimally. In the present work major steps were taken to understand the reinforcing mechanism of Needles. In addition, to investigate the influence of Needles on the mechanical performance of concrete incorporating Needles, at both material and structural levels, a series of laboratory experiments …

To Disclose Or Not To Disclose? Self-Disclosure Of Mental Health In The Workplace, Samantha Margaret Reynolds

Dissertations and Theses

When making the decision to disclose a mental illness, individuals may be met with a number of factors that impact disclosure. This study examines the relationship between self-stigma, psychological safety, social support and self-disclosure of mental illness in the workplace. The present study surveyed 756 participants and found a positive relationship between stigma and self-disclosure as well as a positive relationship between social support and self-disclosure. For work outcomes, there was a negative relationship between both job satisfaction and productivity in relation to self-disclosure. This study potentiates the antecedents and consequences of self-disclosure of mental illness and how it impacts …

: Examining How Factors Associated With Patients, Physicians, Hospitals, And Surrounding Communities Affect Primary And Repeat Cesarean Delivery Through A Social-Ecological Lens, Christina Ventura-Dipersia

Dissertations and Theses

Background: Childbirth is one of the most common reasons for hospitalization in the U.S., and Cesarean delivery (i.e., surgical childbirth) is costlier and has a higher likelihood of birth-related complications, maternal rehospitalization, and postpartum medical care utilization than vaginal delivery. The rate of Cesarean delivery in the United States (U.S.) has increased in recent years by over 60%, from 20.7% of all births in 1996 to 32.9% of all births in 2011. As Although this increasing trend of Cesarean delivery incidence has also been seen in other countries, the rate of Cesarean delivery has been rising more steadily within …

Student Sustainability Leadership Development At Portland State University: Developing Holistic Sustainability Leaders, Megan Suzanne Schneider

Dissertations and Theses

In order to address the myriad of social, economic, and environmental challenges the world is facing, we need to be able to engage in leadership that fosters collective action towards sustainable solutions. Higher education is an institution that can equip people with the abilities to engage in sustainability leadership. This master's thesis research explores how students develop sustainability leadership through their college experience. Nine students, who had been identified as sustainability leaders through their participation in the Student Sustainability Center (SSC), a co-curricular sustainability program at Portland State University, were selected to be part of this grounded theory research project. …

Ethnonational Identity And Detached Lives In A Serbian Province: A Study Of Parallelism Among Vojvodina's Hungarian Community, Uros Prokic

Dissertations and Theses

Current theories of interethnic relations generally posit assimilation, integration and marginalization as possible outcomes between minority and dominant groups in Eastern Europe. However, there may be cases that are not adequately described by any of these existing interethnic relations paradigms. This dissertation explores one alternative, dubbed parallelism, which can be described as institutionally-driven self-isolation and detachment leading to communities living side by side on parallel trajectories and not interacting. Using the Hungarian ethnonational minority community in Serbia's autonomous northern province of Vojvodina as a case study, the author examines the institutional factors that have led to parallelism. Primary data from …

The Combined Effects Of Parent And Teacher Involvement On The Development Of Adolescents' Academic Engagement, Nicolette Paige Rickert

Dissertations and Theses

The current dissertation includes two related studies designed to examine the combined effects of parent and teacher involvement on the development of adolescents' academic engagement as they transition to middle school. Previous studies have demonstrated the positive, individual effects of parent and teacher warm involvement on adolescents' engagement in school. However, this research is limited in its focus on only one social partner. Adolescent development is embedded within multiple, dynamic systems, necessitating the examination of both parent and teacher influences. The few studies that have examined parents and teachers together suggest that their combined effects are both cumulative (additive) and …

Systems Isomorphisms In Stochastic Dynamic Systems, Rajesh Venkatachalapathy

Dissertations and Theses

The identification of isomorphisms between disparate systems is an important focus of systems science. Such isomorphisms have not only conceptual and pedagogical value to systems science, but they also provide pragmatic value to specific disciplines by suggesting new ways to model familiar phenomena and by serving as reference models that show how even simple models can generate complex behavior. Specifically, this dissertation looks at certain classes of stochastic dynamic systems (SDS) and shows that similar equations can model phenomena in sociology and psychology. In both disciplines, what is modeled by these SDS isomorphisms is a certain type of reliability, defined …

Statistical Analysis Of Social Network Change, Teresa Danielle Schmidt

Dissertations and Theses

This project explores two statistical methods that infer social network structures and statistically test those structures for change over time: regression-based differential network analysis (R-DNA) and information theory-based differential analysis (I-DNA). R-DNA is adapted from bioinformatics and I-DNA employs reconstructability analysis.

This project applies both R-DNA and I-DNA to analyze Medicaid claims data from one-year periods before (May 2011- Apr 2012) and after (Jan 2013-Dec 2013) the formation of the Health Share of Oregon Coordinated Care Organization (CCO). The formation of CCOs was legislated by the state of Oregon in 2012 with the triple aim of improving health outcomes, reducing …

A Mixed Methods Analysis Of Corpus Data From Reddit Discussions Of "Gay Voice", Sara Elizabeth Mulliner

Dissertations and Theses

In the last decade, there have been a number of public discussions about "gay voice" and "sounding gay." These two phrases often serve as a shorthand for the belief that a listener can determine the sexuality of a speaker based on phonetic qualities found in a speaker's vocal output. However, these expressions are more accurately described as "catch-all" terms for speech that may contain features associated with non-gender conforming stances and personae. Notions about gender and sexuality could be intertwined in complicated ways in this language ideology. Investigating popular discussions of gay-sounding voices could provide information on what people are …

Flood Dynamics In The Portland Metropolitan Area, Past, Present, And Future, Lumas Terence Helaire

Dissertations and Theses

The Portland area has an extensive flood history since it was founded in 1845. In the late 19th century, the Portland area was prone to flooding from snowmelt freshets (3-6 months duration) and brief winter rain or rain-on-snow events. Since that time the magnitude of spring freshets has been curtailed by 45% due to climate change, flow diversions, and reservoir management. Along with changes in hydrology, the bathymetry of the Lower Columbia River has been altered by the dredging of the navigation channel, diking, and land reclamation. To understand how these changes in hydrology and bathymetry have affected tidal and …

Acceptability Of A Vaginal Ring To Prevent Hiv And Pregnancy: Integrating Multiple Qualitative Methods, Dana Watnick

Dissertations and Theses

Heterosexual vaginal sex can simultaneously put women at risk for unintended pregnancy and sexually transmitted infections, such as HIV, disproportionately impacting poor women around the world. Both unintended pregnancy and HIV are persistent public health concerns associated with negative outcomes for mothers, families and communities. The current mix of prevention tools available to women to protect against unintended pregnancy and HIV is limited. Multipurpose Prevention Technologies (MPTs) are innovative products that simultaneously offer protection against pregnancy and HIV. However, MPTs will only be effective in reducing unintended pregnancy and incident HIV if women are willing to use them. With an …

An Application Of Deep Learning Models To Automate Food Waste Classification, Alejandro Zachary Espinoza

Dissertations and Theses

Food wastage is a problem that affects all demographics and regions of the world. Each year, approximately one-third of food produced for human consumption is thrown away. In an effort to track and reduce food waste in the commercial sector, some companies utilize third party devices which collect data to analyze individual contributions to the global problem. These devices track the type of food wasted (such as vegetables, fruit, boneless chicken, pasta) along with the weight. Some devices also allow the user to leave the food in a kitchen container while it is weighed, so the container weight must also …

The Optimized Synthesis Of Copper Nanowire For High-Quality And Fabrication Of Core-Shell Nanowire, Suhyun Lee

Dissertations and Theses

Flexible electronics are the promising technology for prospective application in foldable phones. Currently, indium tin oxide (ITO) has been widely used for electronic devices including flat-panel display. However, it is brittle and expensive. Metal nanowires are considered as alternative materials. Among various metal nanowires, copper nanowires are attractive because of its high electrical conductivity, better flexibility, and low cost compared with ITO. However, copper nanowires are very prone to oxidize, which causes subsequent degradation of electrical conductivity. Due to this oxidation issue, core-shell structure nanowires, which are formed silver shell having high conductivity and low resistivity on the surfaces of …

A 30-Year Climatology Of Meteorological Conditions Associated With Lightning Days In The Western United States, Dmitri Alexander Kalashnikov

Dissertations and Theses

A 30-year climatology of lightning and associated synoptic meteorological patterns are characterized across the Western United States (WUS), utilizing a comprehensive composite analysis. Results generally show a preferred synoptic meteorological setup with positive 500-hPa geopotential height anomalies to the northeast of the location experiencing a lightning day, and negative sea level pressure anomalies co-located and to the northwest. Variation in preferred anomaly patterns across the western US reflects the divide between those areas affected by the North American monsoon system and areas outside the monsoonal core. Locations in the western Great Basin and northern Rocky Mountains, which are outside the …

Explaining The Sectarian Violence In The Middle East: A Conflict Analysis Of The Case Study Of Saudi Arabia And Iran, Ahmed Elsayed Eltally

Dissertations and Theses

The Middle East has been rife with conflicts, extremism, and sectarianism in recent decades. Many explanations attribute the rise of sectarianism in the Middle East to the historical divide between Sunni and Shia Muslims, while others attribute it to power or identity concerns. This thesis explores the factors that contributed to the rise of contemporary sectarianism in the Middle East through the case study of Saudi-Iranian rivalry. Drawing on the literature on the history of the Middle East, Islam, theories of international relations, and conflict studies, it underlines how Saudi Arabia and Iran use sectarianism to further their interests. This …

Hf Iq Mixer Vfo Temperature Compensation And Drive Level Optimization For Opposite Sideband Suppression, Katlin Anne-Rostomyan Dahn

Dissertations and Theses

An amateur radio 40m band temperature compensated variable frequency oscillator (VFO) with drive-level optimized for opposite sideband suppression for use as the local oscillator (LO) of a high frequency (HF) IQ image reject mixer is considered in this work. The first problem of this thesis was the discovery of the HF IQ mixer's opposite sideband suppression dependence on LO drive-level. As a solution to this problem, the author built a fixed drive-level VFO for the optimal opposite sideband suppression. This then led to the second problem of this thesis; the discovery by this author of the well-known problem of VFO …

"An Idolatry Of Sound" : Nature, The Natural, And The Castrato's Body In The Eighteenth Century, Caitlin Elizabeth Pala

Dissertations and Theses

The castrati--Italian men castrated before puberty in order to retain their high singing voice--were Europe's first superstars, reaching the height of their popularity in the first few decades of the eighteenth century. While only a tiny percentage of the European population, the castrati embodied many of the significant medical and philosophical questions of the Enlightenment that aimed to understand humanity: human emotion, physiology, sexuality, and culture. As a part of the ongoing debate over what was "natural," the castrati hold an interesting place. At the broadest level, the very existence of the castrati asked what it was to be a …

Analysis Of E-Cigarette Liquids And Aerosols By Nmr Spectroscopy: Compositions, Boiling Points, And Degradation Profiles, Anna Katherine Duell

Dissertations and Theses

Electronic cigarettes (e-cigarettes) are an increasingly popular tobacco product used by ~3% of adults and 21% of 12th grade students (as reported for the prior 30-days in surveys) in the United States in 2018. As of 2019, this number went up to ~25% for 12th grade students. Due to how quickly e-cigarettes gained popularity and the rapid design changes that have ensued, there has not been enough time to accurately assess the effects of e-cigarettes, particularly for long-term use. The liquids used in e-cigarettes (e-liquids) can degrade when vaped in an e-cigarette, so understanding the variables that can modulate degradation …