Matching Items (16)
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In recent years, there has been increased interest in the Indium Gallium Nitride (InGaN) material system for photovoltaic (PV) applications. The InGaN alloy system has demonstrated high performance for high frequency power devices, as well as for optical light emitters. This material system is also promising for photovoltaic applications

In recent years, there has been increased interest in the Indium Gallium Nitride (InGaN) material system for photovoltaic (PV) applications. The InGaN alloy system has demonstrated high performance for high frequency power devices, as well as for optical light emitters. This material system is also promising for photovoltaic applications due to broad range of bandgaps of InxGa1-xN alloys from 0.65 eV (InN) to 3.42 eV (GaN), which covers most of the electromagnetic spectrum from ultraviolet to infrared wavelengths. InGaN’s high absorption coefficient, radiation resistance and thermal stability (operating with temperature > 450 ℃) makes it a suitable PV candidate for hybrid concentrating solar thermal systems as well as other high temperature applications. This work proposed a high efficiency InGaN-based 2J tandem cell for high temperature (450 ℃) and concentration (200 X) hybrid concentrated solar thermal (CSP) application via numerical simulation. In order to address the polarization and band-offset issues for GaN/InGaN hetero-solar cells, band-engineering techniques are adopted and a simple interlayer is proposed at the hetero-interface rather than an Indium composition grading layer which is not practical in fabrication. The base absorber thickness and doping has been optimized for 1J cell performance and current matching has been achieved for 2J tandem cell design. The simulations also suggest that the issue of crystalline quality (i.e. short SRH lifetime) of the nitride material system to date is a crucial factor limiting the performance of the designed 2J cell at high temperature. Three pathways to achieve ~25% efficiency have been proposed under 450 ℃ and 200 X. An anti-reflection coating (ARC) for the InGaN solar cell optical management has been designed. Finally, effective mobility model for quantum well solar cells has been developed for efficient quasi-bulk simulation.
ContributorsFang, Yi, Ph.D (Author) / Vasileska, Dragica (Thesis advisor) / Goodnick, Stephen (Thesis advisor) / Ponce, Fernando (Committee member) / Nemanich, Robert (Committee member) / Arizona State University (Publisher)
Created2017
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Description
Political polarization is the coalescence of political parties -- and the individuals of which parties are composed -- around opposing ends of the ideological spectrum. Political parties in the United States have always been divided, however, in recent years this division has only intensified. Recently, polarization has also wound its

Political polarization is the coalescence of political parties -- and the individuals of which parties are composed -- around opposing ends of the ideological spectrum. Political parties in the United States have always been divided, however, in recent years this division has only intensified. Recently, polarization has also wound its way to the Supreme Court and the nomination processes of justices to the Court. This paper examines how prevalent polarization in the Supreme Court nomination process has become by looking specifically at the failed nomination of Judge Merrick Garland and the confirmations of now-Justices Neil Gorsuch and Brett Kavanaugh. This is accomplished by comparing the ideologies and qualifications of the three most recent nominees to those of previous nominees, as well as analysing the ideological composition of the Senate at the times of the individual nominations.
ContributorsJoss, Jacob (Author) / Hoekstra, Valerie (Thesis director) / Critchlow, Donald (Committee member) / Computer Science and Engineering Program (Contributor) / School of Politics and Global Studies (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05
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Description
The United States is in a period of political turmoil and polarization. New technologies have matured over the last ten years, which have transformed an individual’s relationship with society and government. The emergence of these technologies has revolutionized access to both information and misinformation. Skills such as bias recognition and

The United States is in a period of political turmoil and polarization. New technologies have matured over the last ten years, which have transformed an individual’s relationship with society and government. The emergence of these technologies has revolutionized access to both information and misinformation. Skills such as bias recognition and critical thinking are more imperative than in any other time to separate truth from false or misleading information. Meanwhile, education has not evolved with these changes. The average individual is more likely to come to uninformed conclusions and less likely to listen to differing perspectives. Moreover, technology is further complicating and compounding other issues in the political process. All of this is manifesting in division among the American people who elect more polarized politicians who increasingly fail to find avenues for compromise.

In an effort to address these trends, we founded a student organization, The Political Literates, to fight political apathy by delivering political news in an easy to understand and unbiased manner. Inspired by our experience with this organization, we combine our insights with research to paint a new perspective on the state of the American political system.

This thesis analyzes various issues identified through our observations and research, with a heavy emphasis on using examples from the 2016 election. Our focus is how new technologies like data analytics, the Internet, smartphones, and social media are changing politics by driving political and social transformation. We identify and analyze five core issues that have been amplified by new technology, hindering the effectiveness of elections and further increasing political polarization:

● Gerrymandering which skews partisan debate by forcing politicians to pander to ideologically skewed districts.
● Consolidation of media companies which affects the diversity of how news is shared.
● Repeal of the Fairness Doctrine which allowed media to become more partisan.
● The Citizens United Ruling which skews power away from average voters in elections.
● A Failing Education System which does not prepare Americans to be civically engaged and to avoid being swayed by biased or untrue media.

Based on our experiment with the Political Literates and our research, we call for improving how critical thinking and civics is taught in the American education system. Critical thought and civics must be developed pervasively. With this, more people would be able to form more sophisticated views by listening to others to learn rather than win, listening less to irrelevant information, and forming a culture with more engagement in politics. Through this re-enlightenment, many of America’s other problems may evaporate or become more actionable.
ContributorsStenseth, Kyle (Co-author) / Tumas, Trevor (Co-author) / Mokwa, Michael (Thesis director) / Eaton, John (Committee member) / Department of Information Systems (Contributor) / Department of Supply Chain Management (Contributor) / Sandra Day O'Connor College of Law (Contributor) / Watts College of Public Service & Community Solut (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
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Unmanned aerial vehicles have received increased attention in the last decade due to their versatility, as well as the availability of inexpensive sensors (e.g. GPS, IMU) for their navigation and control. Multirotor vehicles, specifically quadrotors, have formed a fast growing field in robotics, with the range of applications spanning from

Unmanned aerial vehicles have received increased attention in the last decade due to their versatility, as well as the availability of inexpensive sensors (e.g. GPS, IMU) for their navigation and control. Multirotor vehicles, specifically quadrotors, have formed a fast growing field in robotics, with the range of applications spanning from surveil- lance and reconnaissance to agriculture and large area mapping. Although in most applications single quadrotors are used, there is an increasing interest in architectures controlling multiple quadrotors executing a collaborative task. This thesis introduces a new concept of control involving more than one quadrotors, according to which two quadrotors can be physically coupled in mid-flight. This concept equips the quadro- tors with new capabilities, e.g. increased payload or pursuit and capturing of other quadrotors. A comprehensive simulation of the approach is built to simulate coupled quadrotors. The dynamics and modeling of the coupled system is presented together with a discussion regarding the coupling mechanism, impact modeling and additional considerations that have been investigated. Simulation results are presented for cases of static coupling as well as enemy quadrotor pursuit and capture, together with an analysis of control methodology and gain tuning. Practical implementations are introduced as results show the feasibility of this design.
ContributorsLarsson, Daniel (Author) / Artemiadis, Panagiotis (Thesis advisor) / Marvi, Hamidreza (Committee member) / Berman, Spring (Committee member) / Arizona State University (Publisher)
Created2016
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Description
A large amount of research examines the effect of partisan polarization on the institution of Congress, yet we know remarkably little about this political phenomenon’s precise effect on the political behavior of the American electorate. Some scholars argue that polarization is healthy for democracy because it allows political elites to

A large amount of research examines the effect of partisan polarization on the institution of Congress, yet we know remarkably little about this political phenomenon’s precise effect on the political behavior of the American electorate. Some scholars argue that polarization is healthy for democracy because it allows political elites to send clear cues to the mass public, but other scholars postulate that polarization is bad for democracy. Decades of research on voter turnout resulted in a vast accumulation of knowledge on the subject. However, scholars must pay greater attention to data collection and measurement strategies because the prevalent technique to quantify voter turnout artificially deflates participation rates. I take two paths to uncover the effects of partisanship on the decision to vote. From the micro perspective, I utilize a variety of partisanship measures based on survey data. From the aggregate perspective, I argue that calculating voter turnout based on the voting eligible population (VEP) is a superior measurement strategy to other techniques. I adoopt a VEP measure of voter turnout for state-wide races (1994-2010). The results suggest that polarization is an important factor that increases voter turnout at both the individual and aggregate levels.
ContributorsBumgardner, Erik (Author) / Espino, Rodolfo (Thesis advisor) / Fridkin, Kim (Committee member) / Kenney, Patrick (Committee member) / Arizona State University (Publisher)
Created2016
Description

This Thesis presentation and book review is on social media manipulation and the issue of media algorithms developing a close minded perspective in individuals. It discusses the mechanics of these algorithms, the definition of social media manipulation, and the neutral negative impacts on the polarization of our country. It also

This Thesis presentation and book review is on social media manipulation and the issue of media algorithms developing a close minded perspective in individuals. It discusses the mechanics of these algorithms, the definition of social media manipulation, and the neutral negative impacts on the polarization of our country. It also goes into detail on how I applied this research to design projects throughout 4th year of the Visual Communication Design Program.

ContributorsRomero, Emily Gene (Author) / Sanft, Alfred (Thesis director) / Heywood, William (Committee member) / School of Human Evolution & Social Change (Contributor) / The Design School (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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This thesis examines the current polarization of news media, specifically written journalism, either in newspapers or on news websites. Americans increasingly get their news from polarized sources, and that is leading to a large divide in information. This issue is also exacerbated by political idealogy. Furthermore, I explore how the

This thesis examines the current polarization of news media, specifically written journalism, either in newspapers or on news websites. Americans increasingly get their news from polarized sources, and that is leading to a large divide in information. This issue is also exacerbated by political idealogy. Furthermore, I explore how the traditional business model of advertising-based revenue is leading to more polarized news coverage. To combat this, I offer interventions for news organizations, including the importance of journalistic ethics and the possibility of more news organizations transferring to nonprofit status, which has gained traction in recent years. Access to accurate news and information is essential in a functioning democracy, and if polarization and issues in news continue, it will be harmful to America as a whole.

Created2021-05
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This paper addresses echo chambers, an online phenomena wherein social media users can "only hear their own voice". In this paper I will examine the history and recent proliferation of online echo chambers. I will outline a comprehensive theory of echo chamber generation and maintenance, intended for educational value. I

This paper addresses echo chambers, an online phenomena wherein social media users can "only hear their own voice". In this paper I will examine the history and recent proliferation of online echo chambers. I will outline a comprehensive theory of echo chamber generation and maintenance, intended for educational value. I then conduct my own experiment based on previous echo chamber detection work.

ContributorsFinnegan, Colin (Author) / Liu, Huan (Thesis director) / Alatawi, Faisal (Committee member) / Barrett, The Honors College (Contributor) / Computer Science and Engineering Program (Contributor)
Created2022-05
Description
This creative project examines a near-future dystopian Arizona in the form of a novella. The story follows Junia, a young woman who is convinced to join the Neighborhood Watch, an organization dedicated to preserving the Union from political violence by protecting Arizona citizens from hearing opposing political points of view.

This creative project examines a near-future dystopian Arizona in the form of a novella. The story follows Junia, a young woman who is convinced to join the Neighborhood Watch, an organization dedicated to preserving the Union from political violence by protecting Arizona citizens from hearing opposing political points of view. These "Privacy" codes become stricter and stricter as the Watch's relationship with the State deepens. Junia's personal and ideological loyalties are tested to their limits, and her choices will help to construct either, in the words of Alexis Tocqueville, "a formidable circle around thought," or a path to connection in the aftermath of violent polarization.
ContributorsSmith, Eden (Author) / Bell, Matt (Thesis director) / Perez, Luke (Committee member) / Barrett, The Honors College (Contributor) / School of Civic & Economic Thought and Leadership (Contributor) / Department of English (Contributor)
Created2024-05
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Description

History is written by the winners. The losers’ narrative ends with the downfall of their civilization. Right now, the winners writing and teaching American history are setting up the next generation for failure. Instead of honing in on the structural landmarks that made the United States a shining city upon

History is written by the winners. The losers’ narrative ends with the downfall of their civilization. Right now, the winners writing and teaching American history are setting up the next generation for failure. Instead of honing in on the structural landmarks that made the United States a shining city upon a hill, as most victors that would look to perpetuate prosperity would do, many institutions of higher education in charge of teaching our history imbue shame and skepticism of our past into our curriculum. By focusing on the atrocities of American history from an out-of-context modern perspective, we are teaching our young adults that monumental institutions deserve to be torn down, not venerated or improved for modern times. In my research for the Center for American Institutions, I have discovered that the winners that have captured academia and American history subscribe to corrosive tenets rooted in postmodernism and subjective victimhood. Postmodern American historians believe objective truth and knowledge collected over the centuries should be held in radical skepticism because of its origins in a society formed in oppressive systems of hierarchies. After discarding much of our history because progress did not happen fast enough, contemporary American historians believe in constructing a culture that emphasizes an equitable, multiracial democracy rooted in intersectionality, an ideology which has its proponents looking to align itself on vertices of identity—both real and perceived— in search for victimhood and offense. After examining syllabi that displayed this ideology in an empirical study, I examine evidence of this ideology worming itself into history, before spilling off college campuses and into our daily lives. Amplified by social media algorithms, extremist factions on both sides of the political spectrum have been empowered by our academic institutions to abandon the pursuit of truth and our history to construct the culture as they see fit. The casualties in this war over history and culture are too numerous to count, but perhaps the most the most costly one is the Generation Z. By teaching a history that shames instead of empowers, our newest generation enters the political fray unprepared for reasonable civil discourse, interprets such discussions as personal attacks, and feeds the polarized dichotomy destroying our political culture. Beyond our politics, the teaching of history—along with factors like the decline of freedom to play and a concerted focus to aim children towards higher education among others— has resulted in a generation of fragile, anxious, and unprepared individuals that stand ready to be hoodwinked by life, instead of embracing it. My thesis seeks to not only present these problems to you, but to present a model of a solution, a way to tell our history from a winning perspective. My model syllabus strengthens debate, encourages participation in our discourse, and strives to equip students with the tools they need to thrive in America’s vibrant civic culture. America is a winning country and idea, one which deserves to be perpetuated for as long as possible: we should teach our young people to embody this idea and succeed rather than confuse them with a pessimistic portrayal.

ContributorsArmknecht, Robert (Author) / Critchlow, Donald (Thesis director) / Strickland, James (Committee member) / Barrett, The Honors College (Contributor) / Historical, Philosophical & Religious Studies, Sch (Contributor) / School of Politics and Global Studies (Contributor)
Created2023-05