Matching Items (98)
Description
Infrared photodetectors, used in applications for sensing and imaging, such as military target recognition, chemical/gas detection, and night vision enhancement, are predominantly comprised of an expensive II-VI material, HgCdTe. III-V type-II superlattices (SLs) have been studied as viable alternatives for HgCdTe due to the SL advantages over HgCdTe: greater control of the alloy composition, resulting in more uniform materials and cutoff wavelengths across the wafer; stronger bonds and structural stability; less expensive substrates, i.e., GaSb; mature III-V growth and processing technologies; lower band-to-band tunneling due to larger electron effective masses; and reduced Auger recombination enabling operation at higher temperatures and longer wavelengths. However, the dark current of InAs/Ga1-xInxSb SL detectors is higher than that of HgCdTe detectors and limited by Shockley-Read-Hall (SRH) recombination rather than Auger recombination. This dissertation work focuses on InAs/InAs1-xSbx SLs, another promising alternative for infrared laser and detector applications due to possible lower SRH recombination and the absence of gallium, which simplifies the SL interfaces and growth processes. InAs/InAs1-xSbx SLs strain-balanced to GaSb substrates were designed for the mid- and long-wavelength infrared (MWIR and LWIR) spectral ranges and were grown using MOCVD and MBE by various groups. Detailed characterization using high-resolution x-ray diffraction, atomic force microscopy, photoluminescence (PL), and photoconductance revealed the excellent structural and optical properties of the MBE materials. Two key material parameters were studied in detail: the valence band offset (VBO) and minority carrier lifetime. The VBO between InAs and InAs1-xSbx strained on GaSb with x = 0.28 - 0.41 was best described by Qv = ÄEv/ÄEg = 1.75 ± 0.03. Time-resolved PL experiments on a LWIR SL revealed a lifetime of 412 ns at 77 K, one order of magnitude greater than that of InAs/Ga1-xInxSb LWIR SLs due to less SRH recombination. MWIR SLs also had 100's of ns lifetimes that were dominated by radiative recombination due to shorter periods and larger wave function overlaps. These results allow InAs/InAs1-xSbx SLs to be designed for LWIR photodetectors with minority carrier lifetimes approaching those of HgCdTe, lower dark currents, and higher operating temperatures.
ContributorsSteenbergen, Elizabeth H (Author) / Zhang, Yong-Hang (Thesis advisor) / Brown, Gail J. (Committee member) / Vasileska, Dragica (Committee member) / Johnson, Shane R. (Committee member) / Arizona State University (Publisher)
Created2012
Description
Fashion is an inherently political and reflective medium for the daily ramblings and revolutions of a society. Much of the time the influence is subtle. Silhouettes and fabrics reflect different stances on conservatism, on sex, on the degrees to which we fetishize luxury, and on infinite other attitudes of an era. Other times the influence is extremely direct, with text printed on the clothing that explicitly articulates a current societal dynamic. I began exploring fashion in 2016, as the country had reached an unprecedented and linguistically weaponized divide.
While taking a fashion technology course under the instruction of Galina Mihaleva, I developed a tracksuit incorporating concealed LED displays that are capable of scrolling customizable text on the sides of the garment. I expanded on this futuristic execution of politically charged clothes by utilizing a more realistic application of the LED technology in the Bouis Vuitton project. This project is a collection of six white vinyl bags with semi-flexible LED displays projecting revolutionary slogans through the vinyl textile.
The bags act as an appropriate housing for technology that is intended for significantly longer use, as bags have a longer lifespan in wardrobes than clothes and return to trend more frequently. The production investment in the technology is more equitable to the investment in the production of a bag and facilitates the wearer’s broadcasting of concise messages. The result is a collection of functional, utilitarian pieces with a clean, futuristic look and a mixed modern and vintage silhouette scrolling pro-revolutionary messages.
Broadcasting the knock-off name ‘BOUIS VUITTON’, I’ve inserted only my first initial into the reputable luxury company and paired it with slogans: ‘EAT THE RICH’ and ‘HEADS WILL ROLL’. The collection articulates a sense of nihilism felt by the youngest generations growing up on the outside of a very exclusive economic and political sphere. Three upcycled vintage luggage pieces evoke associations with the white American upper-class society of the 1960s. The luggage pieces were retrofitted in white vinyl and white-enameled metal fixtures. Three additional soft bags made of the same material reflect a utilitarian style of functional bags on trend with Spring/Summer 2019 streetwear. For the runway presentation of the bags, the models are dressed in navy-colored Dickies boiler suits, white retro-style Fila sneakers, and white ascots reminiscent of the historical male ruffled cravat. The contradictions of iconic silhouettes from both upper and lower-class American fashion history further the juxtaposition of anti-capitalist slogans posted on luxury goods.
Bouis Vuitton: Bags for the Revolution is intended to embody an unapologetic disregard for established wealth and political power in the most public of venues: the sidewalk, the mall, the high and the low-income neighborhoods – wherever people are wearing clothes. Fashion is the modern protest that requires no permit, and the new poster is a luxury bag.
While taking a fashion technology course under the instruction of Galina Mihaleva, I developed a tracksuit incorporating concealed LED displays that are capable of scrolling customizable text on the sides of the garment. I expanded on this futuristic execution of politically charged clothes by utilizing a more realistic application of the LED technology in the Bouis Vuitton project. This project is a collection of six white vinyl bags with semi-flexible LED displays projecting revolutionary slogans through the vinyl textile.
The bags act as an appropriate housing for technology that is intended for significantly longer use, as bags have a longer lifespan in wardrobes than clothes and return to trend more frequently. The production investment in the technology is more equitable to the investment in the production of a bag and facilitates the wearer’s broadcasting of concise messages. The result is a collection of functional, utilitarian pieces with a clean, futuristic look and a mixed modern and vintage silhouette scrolling pro-revolutionary messages.
Broadcasting the knock-off name ‘BOUIS VUITTON’, I’ve inserted only my first initial into the reputable luxury company and paired it with slogans: ‘EAT THE RICH’ and ‘HEADS WILL ROLL’. The collection articulates a sense of nihilism felt by the youngest generations growing up on the outside of a very exclusive economic and political sphere. Three upcycled vintage luggage pieces evoke associations with the white American upper-class society of the 1960s. The luggage pieces were retrofitted in white vinyl and white-enameled metal fixtures. Three additional soft bags made of the same material reflect a utilitarian style of functional bags on trend with Spring/Summer 2019 streetwear. For the runway presentation of the bags, the models are dressed in navy-colored Dickies boiler suits, white retro-style Fila sneakers, and white ascots reminiscent of the historical male ruffled cravat. The contradictions of iconic silhouettes from both upper and lower-class American fashion history further the juxtaposition of anti-capitalist slogans posted on luxury goods.
Bouis Vuitton: Bags for the Revolution is intended to embody an unapologetic disregard for established wealth and political power in the most public of venues: the sidewalk, the mall, the high and the low-income neighborhoods – wherever people are wearing clothes. Fashion is the modern protest that requires no permit, and the new poster is a luxury bag.
ContributorsViton, Benjamin Douglas (Author) / Sewell, Dennita (Thesis director) / Mihaleva, Galina (Committee member) / School of Art (Contributor) / College of Integrative Sciences and Arts (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
This paper documents a study of the relationship between heads up display (HUDs) customization and player performance. Additional measures capture satisfaction and prior gaming experience. The goal of this study was to develop a framework on which future Human Systems Engineering studies could create games that are tailor made to examine a given area of interest. This study utilized a two-by-two design, where participants play a two-dimensional (2D) platformer game with a mechanic that incentivizes attention to the HUD. This study successfully developed a framework and was moderately successful in uncovering limitations and demonstrating areas for improvement in follow-on studies. Specifically, this study illuminated issues with the low amount of usable data caused by design issues, participant apathy, and reliance on self-reporting data collection. Extensions of this study can utilize this framework and should look to recruit beyond crowdsourcing platforms, collect more diverse data, reduce participant effort, and address other considerations that were found during execution.
ContributorsWallace, Xavier Guillermo (Author) / Roscoe, Rod (Thesis advisor) / Mara, Andrew (Committee member) / Cooke, Nancy (Committee member) / Arizona State University (Publisher)
Created2022
Description
"A Stitch in Time" is a creative project that centered around a creative writing project. The story explores the experiences of a witch named Elio who helps people solve issues in their real lives through the power of dreams. However, he must come to terms with the issues that are present in his own past -- and continue to affect him in the present -- in order to fully reach his potential as a witch. The completed version of this thesis project was two written chapters and a full detailed outline.
ContributorsSaifi, Abigail (Author) / LaCroix, Kristin (Thesis director) / Mara, Andrew (Committee member) / Barrett, The Honors College (Contributor) / Department of English (Contributor) / Department of Psychology (Contributor)
Created2023-05
Description
How does the idea of the visible and invisible, tangible and intangible, interact with the garments on the body? Perception, to become aware through the sense, involves the way in which the eye sees space, both visible and invisible. The way in which we see objects are significant in our everyday life and how we evaluate it. The main pattern the garments encompass are the accordion pleating and the variety in which the pattern can be utilized; the accordion pleating can be scaled, attached together, and twisted around the body. Effervescence is a 6-look collection that entails the idea of perception. The results of the project include 3 completed looks, 3 3D print on fabric, and 8 3D print accessories. In this paper, I will explain the process of creating the collection, the experimentation, and the results.
ContributorsNguyen, Juliana (Author) / Mihaleva, Galina (Thesis director) / Stephenson, Kathy (Committee member) / Tevzadze, Irina (Committee member) / Barrett, The Honors College (Contributor) / School of Art (Contributor)
Created2022-05
Description
Contracting is an integral component of both government (i.e., public) and private business. As part of the contracting process, contracting companies must submit proposals to federal agencies or private businesses; individuals who write proposals on behalf of contracting companies are known as proposal writers. Although proposal writers are central to the proposal writing process, they are only marginally represented in available literature on the contracting and proposal writing processes. Additionally, available literature is disproportionately influenced by industry and trade sources, versus academic sources, and completed by industry authorities. As a result, key findings from such reports may not reflect the feedback gathered as part of this research. This research utilized a 25-question survey with both multiple choice and free answer questions to gauge the most and least effective components of the proposal writing process. Communication and collaboration—internally within the proposal team or within the company, and externally between the company and customers, clients, etc.— were cited as both the most and least effective components of the process. Notably, however, communication and collaboration were not the most frequently encountered issues, as only 23.5% of proposal writers reported communication as a common issues. Instead, supporting resources (46.9%), time/ schedule (49.2%), and direction. instructions (44.9%) were reported as the most common issues that proposal writers encountered, although one in four participants noted that issues were not consistent across proposals.
ContributorsRast, Mickella (Author) / Mara, Andrew (Thesis advisor) / Stambler, Mollie (Committee member) / Madson, Michael (Committee member) / Lambrecht, Kathryn (Committee member) / Arizona State University (Publisher)
Created2023
Description
Educational videos are a large part of the YouTube community, and an emerging niche of these videos is educational videos created by professionals in the field. Creating content on their profession establishes them as experts and trustworthy sources of information that audiences can turn to while researching topics relating to the field. This study includes eighteen videos from three doctors creating medical-educational content posted to YouTube. The purpose of this study was to determine if these content creators use best practices for educational videos and the common themes these videos share. The best practices were gathered from previous research conducted on educational videos. These practices are viewability, timing, accessibility, reliability, and confidence. Commonalities noted across channels were then coded to find common themes within the niche. These themes do not need to be in every video, but they should be present on two channels. These themes include formatting videos and thumbnails, styles of videos, and their use of humor and entertaining additional content. These videos also break down the negative perceptions of authority that are often attached to doctors by humanizing the doctors to the audience. Combining these best practices and the use of the found common themes strengthen the videos to create engaging and educational content.
ContributorsTaylor, Darby Lyn (Author) / Mara, Andrew (Thesis advisor) / Carradini, Stephen (Committee member) / Madson, Michael (Committee member) / Arizona State University (Publisher)
Created2022
Description
The field of technical communication studies informational documents, such as instruction manuals or research articles and so on. Games have instructions, or rules, which must be documented. Technical communication scholars have studied documents for video games, but similar research on tabletop rulebook documents appears to be mostly absent, an absence that creates a gap within technical communication research. Filling this gap, my work studies tabletop game rulebooks, which lie within the genre of instruction manuals. Technical communication has produced a theory of effective manual design, and I present much of that theory as, what I call, standards of effective manual design. I observed 30 tabletop game rulebooks to see how well they follow those standards, and I interviewed or surveyed people who played 15 of those games to see how effective the games’ rulebooks are for those people. This allowed me to see how well a rulebook’s adherence to the standards of effective manual design aligned with its effectiveness. This alignment did not always hold; consequently, though an effective rulebook follows the standards of effective manual design, a rulebook can follow said standards yet be ineffective. I conclude that following the standards is only a necessary, not sufficient, condition for making an effective rulebook. The standards must also be used in the correct way and amount.
ContributorsRiggleman, Mark Kenneth (Author) / Lambrecht, Kathryn (Thesis advisor) / Cooke, Lynne (Committee member) / Mara, Andrew (Committee member) / Arizona State University (Publisher)
Created2024
Description
With 285-million blind and visually impaired worldwide, and 25.5 million in the United States, federally funded universities should be at the forefront when designing accessible websites for the blind community. Fifty percent of the university homepages discussed in my thesis failed accessibility checker tests because alternative text was not provided in the alt-attribute for numerous images, making them inaccessible to blind users. The images which failed included logos, photographs of people, and images with text. Understanding image content and context in relation to the webpage is important for writing alternative text that is useful, yet writers interpret and define the content and context of images differently or not at all. Not all universities follow legal guidelines of using alternative text for online images nor implements best practices of analyzing images prior to describing them within the context of the webpage. When an image used in a webpage is designed only to be seen by sighted users and not to be seen by screen reader software, then that image is not comparably accessible to a blind user, as Section 508 mandates.
ContributorsSabbia, Michael Robert (Author) / Maid, Barry (Thesis advisor) / Brumberger, Eva (Thesis advisor) / Mara, Andrew (Committee member) / Arizona State University (Publisher)
Created2018
Description
Contemporary cities are physical and virtual. This thesis describes the findings of a mixed-methods study concerning visual images of the city in the urban Northeast of the United States. I ground these approaches in existing literature concerning digital media, visual narrative, genre ecology, urban planning, and virtual places. The first part of the study analyzes the results of a survey in which 150 people responded to questions about social media use and the relationships between image type and the functions of social media in urban contexts. The second part of the study analyzes the results of coding one year of visual images tweeted by @CambMA, the municipal Twitter feed for the City of Cambridge, Massachusetts. These approaches required the development of new tools for analyzing visual communication and genre moves in specific media contexts. My research suggests that specific image types are suited for specific media functions in the context of visual communication in virtual urban environments and that some image types are especially effective in capturing and expressing the city. These findings provide potential strategies for municipal social media channels to consider in terms of how they communicate with their audiences.
ContributorsDel Nero, Zachary (Author) / Maid, Barry (Thesis advisor) / D'Angelo, Barbara (Committee member) / Mara, Andrew (Committee member) / Arizona State University (Publisher)
Created2019