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Surface Mechanical Attrition Treatment (SMAT) of 7075 Aluminum Alloy to Induce a Protective Corrosion Resistant Layer

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This paper investigates Surface Mechanical Attrition Treatment (SMAT) and the influence of treatment temperature and initial sample surface finish on the corrosion resistance of 7075-T651 aluminum alloy. Ambient SMAT was performed on AA7075 samples polished to 80-grit initial surface roughness.

This paper investigates Surface Mechanical Attrition Treatment (SMAT) and the influence of treatment temperature and initial sample surface finish on the corrosion resistance of 7075-T651 aluminum alloy. Ambient SMAT was performed on AA7075 samples polished to 80-grit initial surface roughness. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were used to characterize the corrosion behavior of samples before and after SMAT. Electrochemical tests indicated an improved corrosion resistance after application of SMAT process. The observed improvements in corrosion properties are potentially due to microstructural changes in the material surface induced by SMAT which encouraged the formation of a passive oxide layer. Further testing and research are required to understand the corrosion related effects of cryogenic SMAT and initial-surface finish as the COVID-19 pandemic inhibited experimentation plans.

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2020-05

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Managerial Factors in Effective Workplace Communication: Analyzing the effects of Tailoring Communication Styles and Verbalizing Expectations in the Workplace

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This project analyzes the large array of managerial leadership research in congruence with the wide field of workplace communication to attempt to determine the importance of refining communication channels between managers and employees as well as articulate the core competencies

This project analyzes the large array of managerial leadership research in congruence with the wide field of workplace communication to attempt to determine the importance of refining communication channels between managers and employees as well as articulate the core competencies a manager should exhibit when practicing exemplary communication in their respective work environment. The preliminary sections of this thesis will establish the currently existing foundations utilized and narrow the wide range of research available to applicable information regarding positive workplace communication, influencing factors in a feedback loop from the employee’s perspective, as well as leadership aspects and actions a manager can alter or initiate to improve their workplace’s environment through communicational refinement. This research is supplemented with a survey that was administered to Arizona State University student leaders who were involved in coordinating the Regional Business Conference on the Polytechnic campus. The survey data is designed to either confirm or contradict the findings of the literature. The objective of this project is to synthesize an overview of a manager’s responsibilities and recommend actions to tailor and improve workplace communication

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2020-05

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Pandora: A Play by Abbey Toye

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Pandora is a play exploring our relationship with gendered technology through the lens of artificial intelligence. Can women be subjective under patriarchy? Do robots who look like women have subjectivity? Hoping to create a better version of ourselves, The Engineer

Pandora is a play exploring our relationship with gendered technology through the lens of artificial intelligence. Can women be subjective under patriarchy? Do robots who look like women have subjectivity? Hoping to create a better version of ourselves, The Engineer must navigate the loss of her creation, and Pandora must navigate their new world. The original premiere run was March 27-28, 2018, original cast: Caitlin Andelora, Rikki Tremblay, and Michael Tristano Jr.

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2018-05

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Tongues Becoming a Virtuous Woman: A Philosophical and Communicative Approach to Young Women's Speech

Description

Four hundred years after the word "virtuous," came to be associated with a woman's sexuality, today's female adolescent seemingly has everything. Yet, there is a psychological civil war raging in the psyche of the 21st century young American female because

Four hundred years after the word "virtuous," came to be associated with a woman's sexuality, today's female adolescent seemingly has everything. Yet, there is a psychological civil war raging in the psyche of the 21st century young American female because her mind is divided against itself due to the conflicting instructions of who and what she should be. She has so many choices; it is easy to become overwhelmed by them. Today's female youth is threatened. She communicates more and more, but her ability to express herself is inhibited because she is unsure of how to develop an authentic sense of self. It is a hermeneutic understanding of communication and what it means to be "virtuous" that can free young women to cultivate authentic self and continue to make decisions that support such a lifestyle. It is the aim of this thesis to reclaim the word "virtuous" for the benefit of today's young women. Deeper understanding of hermeneutics and communication allow us to view this word in a different light and read the entirety of Proverbs 31 as feminists. Young women have always faced challenges in adolescence, but a return to classical wisdom and philosophy will equip them to further advance themselves and their communities, rather than forcing them into a life of speaking tongue twisters. The virtuous young woman does not know what the future holds, but armed with the lessons of tradition and the fire of hope, she may speak a virtuous magic over the world with a tongue fit for the challenge.

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2018-05

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Communication Strategies for Effective Social Media Use in Local Governments

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An information influx and numerous modes of content delivery has resulted in local governments competing for the public's attention. A recent poll from the Public Technology Institute discovered that although 85% of Local Governments use social media to disseminate information

An information influx and numerous modes of content delivery has resulted in local governments competing for the public's attention. A recent poll from the Public Technology Institute discovered that although 85% of Local Governments use social media to disseminate information to their constituents, only 37% have an enterprise-wide social media strategy (PTI, 2017). Without a clear approach towards social media, Local Governments are failing to maximize their voices and often ineffective when reaching out to their constituents. Research has suggested, charisma is a successful tool for capturing an audience's attention and conveying a memorable message. Charisma can also be taught and executed not only through spoken rhetoric but in online social media platforms. Within this study, 18 local government employees participated in an educational workshop on the use of nine non-verbal "Charismatic Leadership Tactics". Participants completed a pre-workshop assignment which was later compared to a post-workshop assignment. Results showed, participants on average, increased their use of Charismatic Leadership Tactics by a mean of 61%. Researchers collected social media analytics one month prior and one month following the workshop from the City's social media accounts in which participants managed. Collectively, of the thirteen social media accounts, the overall total engagement was greater the month after the educational workshop compared to the month before the workshop. These results suggest charisma can be taught, charisma can be conveyed through micro-blogosphere platforms such as Twitter, and the use of Charismatic Leadership Tactics could be responsible for increasing follower engagement with social media content.

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2018-05

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In situ SEM Testing for Fatigue Crack Growth: Mechanical Investigation of Titanium

Description

Widespread knowledge of fracture mechanics is mostly based on previous models that generalize crack growth in materials over several loading cycles. The objective of this project is to characterize crack growth that occurs in titanium alloys, specifically Grade 5 Ti-6Al-4V,

Widespread knowledge of fracture mechanics is mostly based on previous models that generalize crack growth in materials over several loading cycles. The objective of this project is to characterize crack growth that occurs in titanium alloys, specifically Grade 5 Ti-6Al-4V, at the sub-cycle scale, or within a single loading cycle. Using scanning electron microscopy (SEM), imaging analysis is performed to observe crack behavior at ten loading steps throughout the loading and unloading paths. Analysis involves measuring the incremental crack growth and crack tip opening displacement (CTOD) of specimens at loading ratios of 0.1, 0.3, and 0.5. This report defines the relationship between crack growth and the stress intensity factor, K, of the specimens, as well as the relationship between the R-ratio and stress opening level. The crack closure phenomena and effect of microcracks are discussed as they influence the crack growth behavior. This method has previously been used to characterize crack growth in Al 7075-T6. The results for Ti-6Al-4V are compared to these previous findings in order to strengthen conclusions about crack growth behavior.

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2018-05

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Simulation of Atomic Structure around Defects in Anatase

Description

Titanium dioxide is an essential material under research for energy and environmental applications, chiefly through its photocatalytic properties. These properties allow it to be used for water-splitting, detoxification, and photovoltaics, in addition to its conventional uses in pigmentation and

Titanium dioxide is an essential material under research for energy and environmental applications, chiefly through its photocatalytic properties. These properties allow it to be used for water-splitting, detoxification, and photovoltaics, in addition to its conventional uses in pigmentation and sunscreen. Titanium dioxide exists in several polymorphic structures, of which the most common are rutile and anatase. We focused on anatase for the purposes of this research, due to its promising results for hydrolysis.

Anatase exists often in its reduced form (TiO2-x), enabling it to perform redox reactions through the absorption and release of oxygen into/from the crystal lattice. These processes result in structural changes, induced by defects in the material, which can theoretically be observed using advanced characterization methods. In situ electron microscopy is one of such methods, and can provide a window into these structural changes. However, in order to interpret the structural evolution caused by defects in materials, it is often necessary and pertinent to use atomistic simulations to compare the experimental images with models.

In this thesis project, we modeled the defect structures in anatase, around oxygen vacancies and at surfaces, using molecular dynamics, benchmarked with density functional theory. Using a “reactive” forcefield designed for the simulation of interactions between anatase and water that can model and treat bonding through the use of bond orders, different vacancy structures were analyzed and simulated. To compare these theoretical, generated models with experimental data, the “multislice approach” to TEM image simulation was used. We investigated a series of different vacancy configurations and surfaces and generated fingerprints for comparison with TEM experiments. This comparison demonstrated a proof of concept for a technique suggesting the possibility for the identification of oxygen vacancy structures directly from TEM images. This research aims to improve our atomic-level understanding of oxide materials, by providing a methodology for the analysis of vacancy formation from very subtle phenomena in TEM images.

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2019-05

Structural Health Monitoring: Acoustic Emissions

Description

Non-Destructive Testing (NDT) is integral to preserving the structural health of materials. Techniques that fall under the NDT category are able to evaluate integrity and condition of a material without permanently altering any property of the material. Additionally,

Non-Destructive Testing (NDT) is integral to preserving the structural health of materials. Techniques that fall under the NDT category are able to evaluate integrity and condition of a material without permanently altering any property of the material. Additionally, they can typically be used while the material is in active use instead of needing downtime for inspection.
The two general categories of structural health monitoring (SHM) systems include passive and active monitoring. Active SHM systems utilize an input of energy to monitor the health of a structure (such as sound waves in ultrasonics), while passive systems do not. As such, passive SHM tends to be more desirable. A system could be permanently fixed to a critical location, passively accepting signals until it records a damage event, then localize and characterize the damage. This is the goal of acoustic emissions testing.
When certain types of damage occur, such as matrix cracking or delamination in composites, the corresponding release of energy creates sound waves, or acoustic emissions, that propagate through the material. Audio sensors fixed to the surface can pick up data from both the time and frequency domains of the wave. With proper data analysis, a time of arrival (TOA) can be calculated for each sensor allowing for localization of the damage event. The frequency data can be used to characterize the damage.
In traditional acoustic emissions testing, the TOA combined with wave velocity and information about signal attenuation in the material is used to localize events. However, in instances of complex geometries or anisotropic materials (such as carbon fibre composites), velocity and attenuation can vary wildly based on the direction of interest. In these cases, localization can be based off of the time of arrival distances for each sensor pair. This technique is called Delta T mapping, and is the main focus of this study.

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2019-05

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2D or Not To Be: The Story and Science of Graphene

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The story of graphene truly began in what was simply a stub in the journal Physical Review not two years after the end of World War II. In 1947, McGill University physicist P.R. Wallace authored “The Band Theory of Graphite”

The story of graphene truly began in what was simply a stub in the journal Physical Review not two years after the end of World War II. In 1947, McGill University physicist P.R. Wallace authored “The Band Theory of Graphite” and attempted to develop a foundation on which the structure-property relationship of graphite could be explored; he calculates the number of free electrons and conductivity of what he describes as “a single hexagonal layer” and “suppos[es] that conduction takes place only in layers” in bulk graphite to predict wave functions, energies at specific atomic sites in the hexagonal lattice, and energy contours using a tight binding approximation for a hypothesized version of what we now call ‘armchair-style’ graphene. While Wallace was the first to explore the band structure and Brillouin Zones of single-layer graphite, the concept of two-dimensional materials was not new. In fact, for years, it was dismissed as a thermodynamic impossibility.

Everything seemed poised against any proposed physical and experimental stability of a structure like graphene. “Thermodynamically impossible”– a not uncommon shutdown to proposed novel physical or chemical concepts– was once used to describe the entire field of proposed two-dimensional crystals functioning separately from a three-dimensional base or crystalline structure. Rudolf Peierls and Lev Davoidovich Landau, both very accomplished physicists respectively known for the Manhattan Project and for developing a mathematical theory of helium superfluidity, rejected the possibility of isolated monolayer to few-layered crystal lattices. Their reasoning was that diverging thermodynamic-based crystal lattice fluctuations would render the material unstable regardless of controlled temperature. This logic is flawed, but not necessarily inaccurate– diamond, for instance, is thermodynamically metastable at room temperature and pressure in that there exists a slow (i.e. slow on the scale of millions of years) but continuous transformation to graphite. However, this logic was used to support an explanation of thermodynamic impossibility that was provided for graphene’s lack of isolation as late as 1979 by Cornell solid-state physicist Nathaniel David Mermin. These physicists’ claims had clear and consistent grounding in experimental data: as thin films become thinner, there exists a trend of a decreasing melting temperature and increasing instability that renders the films into islands at somewhere around ten to twenty atomic layers. This is driven by the thermodynamically-favorable minimization of surface energy.

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2018-05

Professional Improvisation Workshop

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The first thought that comes to mind for most people when they hear of improvisation is most likely the memory of a funny performance seen on television shows such as Who’s Line is it Anyway? or perhaps the opportunity to

The first thought that comes to mind for most people when they hear of improvisation is most likely the memory of a funny performance seen on television shows such as Who’s Line is it Anyway? or perhaps the opportunity to be an audience member for a live improv troupe performance. In either of these settings, improvisation can be hilarious, dramatic and entertaining and it makes you wonder how people could possibly be making these scenes up on the spot. Unfortunately, not everyone has first-hand experience with the creative, team-building “magic” of improvisation games and exercises. Watching professional improvisation perform can be intimidating to an observer who hopes to one day be an improvisor themselves. Because of this, the immense benefits that improvisation can have within a professional workplace are often overlooked or ignored. I, myself, never had any experience with improvisation or being on stage until the second semester of my sophomore year when I made the choice to try out for ASU comedy.

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2019-05