Matching Items (530)
Description
In 2022, integrated circuit interconnects will approach 10 nm and the diffusion barrier layers needed to ensure long lasting devices will be at 1 nm. This dimension means the interconnect will be dominated by the interface and it has been shown the interface is currently eroding device performance. The standard interconnect system has three layers - a Copper metal core, a Tantalum Adhesion layer and a Tantalum Nitride Diffusion Barrier Layer. An alternate interconnect schema is a Tantalum Nitride barrier layer and Silver as a metal. The adhesion layer is removed from the system along with changing to an alternate, low resistivity metal. First principles are used to assess the interface of the Silver and Tantalum Nitride. Several stoichiometric 1:1 Tantalum Nitride polymorphs are assessed and it is found that the Fe2P crystal structure is actually the most stable crystal structure which is at odds with the published phase diagram for ambient crystal structure. The surface stability of Fe2P-TaN is assessed and the absorption enthalpy of Silver adatoms is calculated. Finally, the thermodynamic stability of the TaN-Ag interconnect system is assessed.
ContributorsGrumski, Michael (Author) / Adams, James (Thesis advisor) / Krause, Stephen (Committee member) / Alford, Terry (Committee member) / Arizona State University (Publisher)
Created2012
Description
As world energy demands increase, research into more efficient energy production methods has become imperative. Heterogeneous catalysis and nanoscience are used to promote chemical transformations important for energy production. These concepts are important in solid oxide fuel cells (SOFCs) which have attracted attention because of their potential to provide an efficient and environmentally favorable power generation system. The SOFC is also fuel-flexible with the ability to run directly on many fuels other than hydrogen. Internal fuel reforming directly in the anode of the SOFC would greatly reduce the cost and complexity of the device. Methane is the simplest hydrocarbon and a main component in natural gas, making it useful when testing catalysts on the laboratory scale. Nickel (Ni) and gadolinium (Gd) doped ceria (CeO2) catalysts for potential use in the SOFC anode were synthesized with a spray drying method and tested for catalytic performance using partial oxidation of methane and steam reforming. The relationships between catalytic performance and structure were then investigated using X-ray diffraction, transmission electron microscopy, and environmental transmission electron microscopy. The possibility of solid solutions, segregated phases, and surface layers of Ni were explored. Results for a 10 at.% Ni in CeO2 catalyst reveal a poor catalytic behavior while a 20 at.% Ni in CeO2 catalyst is shown to have superior activity. The inclusion of both 10 at.% Gd and 10 at.% Ni in CeO2 enhances the catalytic performance. Analysis of the presence of Ni in all 3 samples reveals Ni heterogeneity and little evidence for extensive solid solution doping. Ni is found in small domains throughout CeO2 particles. In the 20 at.% Ni sample a segregated, catalytically active NiO phase is observed. Overall, it is found that significant interaction between Ni and CeO2 occurs that could affect the synthesis and functionality of the SOFC anode.
ContributorsCavendish, Rio (Author) / Crozier, Peter (Thesis advisor) / Adams, James (Committee member) / Smith, David (Committee member) / Arizona State University (Publisher)
Created2012
Description
Studies over the past years have collected data on the opinions of women in the workforce related to family planning and societal norms (Buddhapriya, 2009). However, these studies do not address the opinions of college students, the majority of whom have not yet entered the workforce yet, may have strong opinions about whether or not career ambitions and the desire for children are mutually exclusive. In addition, these studies mainly focus on the hardships of women already in the workforce, rather than to understand how to broaden the workforce to accommodate women before entering motherhood. Therefore, to encourage mothers in the workforce to strive for high professional achievement, it is important to first encourage those making life-changing decisions based on degree choice in college. In doing this, 111 Arizona State University (ASU) students of all years, gender, and college choice were surveyed to better understand the difference between men's and women’s opinions on family planning in relation to career. The results of the survey concluded that more women have not let family planning affect their choice of major and career aspirations. Although previous studies have shown that a job affects motherhood in the professional aspect, this does not seem to be a reason to alter career choices.
ContributorsBowman, Hannah L (Author) / Kappes, Janelle (Thesis director) / Sullivan-Detheridge, Julie (Committee member) / School of Sustainability (Contributor) / Department of Information Systems (Contributor) / Dean, W.P. Carey School of Business (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
Description
A large section of United States citizens live far away from supermarkets and do not have an easy way to get to one. This portion of the population lives in an area called a food desert. Food deserts are geographic areas in which access to affordable, healthy food, such as fresh produce, is limited or completely nonexistent due to the absence of convenient grocery stores. Individuals living in food deserts are left to rely on convenience store snacks and fast food for their meals because they do not have access to a grocery store with fresh produce in their area. Unhealthy foods also lead to health issues, as people living in food deserts are typically at a higher risk of diet-related conditions, such as obesity, diabetes, and cardiovascular disease. Harvest, a sustainable farming network, is a smartphone application that teaches and guides people living in small spaces through the process of growing fresh, nutritious produce in their own homes. The app will guide users through the entire process of gardening, from seed to harvest. Harvest would give individuals living in food deserts an opportunity to access fresh produce that they currently can’t access. An overwhelming response based on our user discussion and market analysis revealed that our platform was in demand. Development of a target market, brand guide, and full-lifecycle were beneficial during the second semester as Harvest moved forward. Through the development of a website, social media platform, and smartphone application, Harvest grew traction for our platform. Our social media accounts saw a 1700% growth rate, and this wider audience was able to provide helpful feedback.
ContributorsTobey, Anna Elisabeth (Co-author) / Raimondo, Felix (Co-author) / Balamut, Hannah (Co-author) / Byrne, Jared (Thesis director) / Givens, Jessica (Committee member) / Satpathy, Asish (Committee member) / School of Life Sciences (Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
Description
As Arizona enters its fifteenth year of drought and Lake Mead hits historic lows, water management and policy planning will become increasingly important to ensure future water security in the Southwestern region of the United States. This thesis compares water demand trends and policies at the municipal level in Phoenix and Tucson, Arizona over the time period from 1980-2010. By analyzing gallons per capita per day (GPCD) trends for each city in the context of population growth, drought, and major state and local policies over the twenty year period, reasons for declines in per capita water demand were explored. Despite differences in their available water sources and political cultures, both the City of Phoenix and the City of Tucson have successfully reduced their per capita water consumption levels between 1980 and 2010. However, this study suggests that each city's measured success at reducing GPCD has been more a result of external events (supply augmentation, drought, and differing development trends) rather than conservation and demand reduction regulations adopted under the auspices of the Groundwater Management Act.
ContributorsSnyder, Rachel Claire (Author) / Larson, Kelli (Thesis director) / Hirt, Paul (Committee member) / Barrett, The Honors College (Contributor) / School of International Letters and Cultures (Contributor) / School of Sustainability (Contributor) / School of Politics and Global Studies (Contributor)
Created2015-05
Description
The Art of Extraction: ABSTRACT
Anthropocentric society faces a multiplicity of environmental challenges, catalyzed and perpetuated by urban-industrial culture. Many of today’s perspectives and sustainable strategies cannot accommodate the challenges’ inherent complexity. Because urban-industrial society is only projected to grow, both in enormity and influence, the only viable option is to elucidate the complexity and employ it.
A potential setting in which to frame this exploration is the intersection of urbanism, landscape, and ecology –an overlap first introduced by the theories of Landscape Urbanism and Ecological Urbanism. Here, urbanization is not just discussed as an isolated phenomenon but one that is embedded within and responding to a variety of systems and scales. The methodologies of Landscape Urbanism and Ecological Urbanism also acknowledge artists and the visual arts as invaluable tools for realizing, communicating, and inspiring the new perspectives and modes of intervention needed to address the aforementioned urban complexity. Such artists who operate within this realm include Sissel Tolaas, Maya Lin, Katrin Sigurdardottir, David Maisel, Olafur Eliason, Mierle Ukeles, Suzanne Lacy, Steve Rowell, Mel Chin, and the Center for Land Use Interpretation. Case study analyses reveal many of these artists begin their investigations with provocative, searching questions situated within the realms of urbanism, landscape, and ecology. This is proceeded by relative scientific research and/or community involvement or outreach. Furthermore, the artists work within and extrapolate from a variety of other disciplines —increasing the scope and applicability of their work. The information they collect via this multidisciplinary approach is then metaphorically translated to the visual arts, where the public can not only physically or sensorially experience it, but understand and deduce its meaning and significance: public awareness being one of the more essential aspects of a sustainable society and at the root of our current struggle.
As a designer and architect, I will engage the artist’s mindset to explore the current and complex issue of resource extraction within Superior, Arizona: a topic at the core of urbanism, landscape, and ecology. While the town is not considered "urban" by standard definition, it and its surrounding landscapes are indirectly sculpted by the needs of urban society —rendering it the setting for this application. Within a group, we will begin with a searching question. We will conduct relative scientific research, engage the community of Superior, and call upon a variety of other disciplines to aid and inform our work. Through metaphor, the research and resulting discoveries will be artistically represented and composed within a designed exhibition of hopeful “things” (See Bruno Latour, “From Realpolitik to Dingpolitik”). This exhibition will theoretically take place on Superior’s currently dilapidated Main Street, amid a more accessible sphere. The eventual goal of the project is to illuminate and understand the complexities of resource extraction, specifically within Superior, while also enabling public awareness and empowerment through lucidity and comprehension.
Anthropocentric society faces a multiplicity of environmental challenges, catalyzed and perpetuated by urban-industrial culture. Many of today’s perspectives and sustainable strategies cannot accommodate the challenges’ inherent complexity. Because urban-industrial society is only projected to grow, both in enormity and influence, the only viable option is to elucidate the complexity and employ it.
A potential setting in which to frame this exploration is the intersection of urbanism, landscape, and ecology –an overlap first introduced by the theories of Landscape Urbanism and Ecological Urbanism. Here, urbanization is not just discussed as an isolated phenomenon but one that is embedded within and responding to a variety of systems and scales. The methodologies of Landscape Urbanism and Ecological Urbanism also acknowledge artists and the visual arts as invaluable tools for realizing, communicating, and inspiring the new perspectives and modes of intervention needed to address the aforementioned urban complexity. Such artists who operate within this realm include Sissel Tolaas, Maya Lin, Katrin Sigurdardottir, David Maisel, Olafur Eliason, Mierle Ukeles, Suzanne Lacy, Steve Rowell, Mel Chin, and the Center for Land Use Interpretation. Case study analyses reveal many of these artists begin their investigations with provocative, searching questions situated within the realms of urbanism, landscape, and ecology. This is proceeded by relative scientific research and/or community involvement or outreach. Furthermore, the artists work within and extrapolate from a variety of other disciplines —increasing the scope and applicability of their work. The information they collect via this multidisciplinary approach is then metaphorically translated to the visual arts, where the public can not only physically or sensorially experience it, but understand and deduce its meaning and significance: public awareness being one of the more essential aspects of a sustainable society and at the root of our current struggle.
As a designer and architect, I will engage the artist’s mindset to explore the current and complex issue of resource extraction within Superior, Arizona: a topic at the core of urbanism, landscape, and ecology. While the town is not considered "urban" by standard definition, it and its surrounding landscapes are indirectly sculpted by the needs of urban society —rendering it the setting for this application. Within a group, we will begin with a searching question. We will conduct relative scientific research, engage the community of Superior, and call upon a variety of other disciplines to aid and inform our work. Through metaphor, the research and resulting discoveries will be artistically represented and composed within a designed exhibition of hopeful “things” (See Bruno Latour, “From Realpolitik to Dingpolitik”). This exhibition will theoretically take place on Superior’s currently dilapidated Main Street, amid a more accessible sphere. The eventual goal of the project is to illuminate and understand the complexities of resource extraction, specifically within Superior, while also enabling public awareness and empowerment through lucidity and comprehension.
ContributorsTwilling, Emilie Marie (Author) / Stayner, Christian (Thesis director) / Harris, Catherine (Committee member) / Barrett, The Honors College (Contributor) / School of Sustainability (Contributor) / The Design School (Contributor)
Created2015-05
Description
After researching pediatric cancer experiences, an opportunity emerged creating a less intimidating environment for children undergoing chemotherapy. By means of adding a creative component to their IV pole and disguising machinery, children will be a part of an Imagination Voyage adventure. Creative themes allow for a journey on a pirate ship, or being in a fantasy castle by captivating children in playtime. The design allows for a frightening experience to become a positive one.
ContributorsHerold, Brittany Ann (Author) / Shin, Dosun (Thesis director) / McDermott, Lauren (Committee member) / Barrett, The Honors College (Contributor) / Herberger Institute for Design and the Arts (Contributor) / School of Sustainability (Contributor) / The Design School (Contributor)
Created2015-05
Description
I set out to better understand the issues, perceptions & solutions surrounding drought. The question that compelled my project was "What might be all the ways that we can improve the experience of conserving, reusing & educating on the topic of water." Through the process of design research I developed a system of products that improves the user experiences surrounding water. The result is IOW, an intelligent 3-product system that aims to make your water needs & wants smarter & less wasteful.
ContributorsShappee, Christian Kyle (Author) / Shin, Dosun (Thesis director) / McDermott, Lauren (Committee member) / Barrett, The Honors College (Contributor) / Herberger Institute for Design and the Arts (Contributor) / School of Sustainability (Contributor) / The Design School (Contributor)
Created2015-05
Description
As the poverty level increases in Arizona, so does the opportunity gap between high- income and low-income students. We believe that all youth regardless of their zip code, the color of their skin, or their family background should see themselves as leaders and scholars in the community. Access to higher education, quite simply should be attainable for all students. The New American University charter that ASU has adopted is inspiring and groundbreaking. We believe this charter underscores the significance of equal access to education. The REACH program embraces the urgency of educational inequity, by enhancing the potential success of high school teenagers, who attend the Boys & Girls Club \u2014 Ladmo Branch in Tempe, Arizona. REACH empowers youth to develop stronger leadership skills, while becoming more involved in their community. We provide an opportunity for these teens to engage in leadership discussions, receive college mentoring/tutoring, and connect with the community and resources that Arizona State University (ASU) has to offer. It is our hope that every REACH teen is inspired to apply for college. REACH strives to provide any support the teens require to be successful throughout the college testing and admission process. REACH works with multiple communities at Arizona State University including the Pat Tillman Scholars, Devils' Advocates, Honors Devils, Changemaker Central, Barrett, The Honors College and W. P. Carey School of Business to organize and lead a group of teens through a remarkable curriculum that will shape the way they view cultural diversity, educational achievement, and leadership. The weekly meetings consist of discussions, creative team-building, critical thinking exercises, and cultural awareness experiences. Demonstrating to the teens, administrators, volunteers, mentors, and tutors the rich culture that Tempe has to offer and the skills and experience that they have to offer their community as well. In this thesis will we present our work developing and implementing the REACH program at the Ladmo Branch of the Tempe Boys and Girls Club from the Spring of 2013 through the Spring of 2015. We will describe the structure of REACH, our weekly leadership curriculum, our assessment and evaluation method, and the supplemental programs that we instituted (i.e., tutoring and mentoring). We will reflect on our successes and the challenges that we faced over the span of three years. We will conclude our thesis with a critical analysis of the program as a whole in order to provide advice for others who want to create and engage in a sustainable, student lead, community action organization.
ContributorsBurba, Monica (Co-author) / Smith, Jenna (Co-author) / Mokwa, Michael (Thesis director) / Eaton, John (Committee member) / Barrett, The Honors College (Contributor) / School of Politics and Global Studies (Contributor) / School of Sustainability (Contributor) / School of Historical, Philosophical and Religious Studies (Contributor) / School of International Letters and Cultures (Contributor)
Created2015-05
Description
The transition to lead-free solder in the electronics industry has benefitted the environment in many ways. However, with new materials systems comes new materials issues. During the processing of copper pads, a protective surface treatment is needed to prevent the copper from oxidizing. Characterizing the copper oxidation underneath the surface treatment is challenging but necessary for product reliability and failure analysis. Currently, FIB-SEM, which is time-consuming and expensive, is what is used to understand and analyze the surface treatment-copper oxide(s)-copper system. This project's goals were to determine a characterization methodology that cuts both characterization time and cost in half for characterizing copper oxidation beneath a surface treatment and to determine which protective surface treatment is the best as defined by multiple criterion such as cost, sustainability, and reliability. Two protective surface treatments, organic solderability preservative (OSP) and chromium zincate, were investigated, and multiple characterization techniques were researched. Six techniques were tested, and three were deemed promising. Through our studies, it was determined that the best surface treatment was organic solderability preservative (OSP) and the ideal characterization methodology would be using FIB-SEM to calibrate a QCM model, along with using SERA to confirm the QCM model results. The methodology we propose would result in a 91% reduction in characterization cost and a 92% reduction in characterization time. Future work includes further calibration of the QCM model using more FIB/SEM data points and eventually creating a model for oxide layer thickness as a function of exposure time and processing temperature using QCM as the primary data source. In doing my Capstone project for Intel, a large electronics manufacturing company, I feel it is important to remember the effects of our tools and industry on the environment and to consider the product life cycle in terms other than monetary gain and raw material recycling. To this end I will be discussing how lead is and was used in manufacturing, how it is disposed of, and how this effects the environment including plant, animal, and insect life, as well as ground water contamination. Since the ban was enacted several years ago, I will compare how lead-free alternatives currently in use compare in environmental impact and possibly raise the question of whether we have simply traded one evil for another.
ContributorsBranch Kelly, Marion Zoe (Author) / Adams, James (Thesis director) / Krause, Stephen (Committee member) / Barrett, The Honors College (Contributor) / Materials Science and Engineering Program (Contributor)
Created2015-05