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The purpose of this honors project is to analyze the difference between different powder separation techniques, and their suitability for my capstone project – ‘Effect of Powder Reuse on DMLS (Direct Metal Laser Sintering) Product Integrity’. Due to the nature of my capstone project, my group needs to characterize foreign

The purpose of this honors project is to analyze the difference between different powder separation techniques, and their suitability for my capstone project – ‘Effect of Powder Reuse on DMLS (Direct Metal Laser Sintering) Product Integrity’. Due to the nature of my capstone project, my group needs to characterize foreign contaminants in IN 718 (Ni-based superalloy) powder with a mean diameter around 40um. In order to clearly analyze the contaminants and recycle useful IN 718 powders, powder separation is favorable since the filtered samples will be much easier to characterize rather than inspect all the powders at once under microscope. By conducting literature review, I found that powder separation is commonly used in Geology, and Chemistry department. To screen which combination of techniques could be the best for my project, I have consulted several research specialists, obtained adequate knowledge about powder separation. Accordingly, I will summarize the pros and cons of each method with regard the specific project that I am working on, and further explore the impacts of each method under economical, societal, and environmental considerations. Several powder separation techniques will be discussed in details in the following sections, including water elutriation, settling column, magnetic separation and centrifugation. In addition to these methods, sieving, water tabling and panning will be briefly introduced. After detailed comparison, I found that water elutriation is the most efficient way to purity IN718 powder for reuse purpose, and recovery rate is as high as 70%, which could result in a significant reduction in the manufacturing cost for Honeywell since currently Honeywell only use virgin powders to build parts, and 90% of the leftover powders are discarded.
ContributorsLuo, Zheyu (Author) / Adams, James (Thesis director) / Tasooji, Amaneh (Committee member) / Materials Science and Engineering Program (Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
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Current farming demographics in the United States indicate an aging and overwhelmingly white group of farmers, stimulating the need for engaging a younger and more diverse population. There is an opportunity to engage these populations through farm-based internship and apprenticeship programs, which are immersive programs on small-scale, sustainable farms. These

Current farming demographics in the United States indicate an aging and overwhelmingly white group of farmers, stimulating the need for engaging a younger and more diverse population. There is an opportunity to engage these populations through farm-based internship and apprenticeship programs, which are immersive programs on small-scale, sustainable farms. These programs are unique in providing hands-on training, housing, meals, and a stipend in return for labor, presenting a pathway to social empowerment. The potential outcomes of increasing diversity and inclusion in farm programs are absent from the research on the benefits of diversity and inclusion in other work environments, such as the corporate setting. This paper presents the results of a study aimed at determining levels of diversity and inclusion in United States farm-based internship programs, and the viability of these programs as an effective opportunity to engage marginalized young people in farming. The study of 13 farm owners and managers across the U.S. found that the participants are focused on fostering education and training, environmental benefits, and a sense of community in their respective programs. All participants either want to establish, or believe they currently have, an inclusive workplace on their farm, but also indicated a barrier to inclusivity in the lack of a diverse applicant pool. Future recommendations for removing that barrier and involving more young, diverse interns include increased outreach and access to these programs, the use of inclusive language, and further research.
ContributorsLascola, Dania (Co-author) / Biel, Braden (Co-author) / Cloutier, Scott (Thesis director) / MacFadyen, Joshua (Committee member) / School of International Letters and Cultures (Contributor) / School of Geographical Sciences and Urban Planning (Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
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Description
This study aims to provide a foundation for future work on photo-responsive polymer composite materials to be utilized in additive manufacturing processes. The curing rate of 2,2-dimethoxy-2-phenyl-acetophenone (DMPA) in thin (<20 µm) and thick (>2 mm) layers of DMPA and poly(ethylene glycol) diacrylate (PEG-DA) mixtures was assessed for 5.0

This study aims to provide a foundation for future work on photo-responsive polymer composite materials to be utilized in additive manufacturing processes. The curing rate of 2,2-dimethoxy-2-phenyl-acetophenone (DMPA) in thin (<20 µm) and thick (>2 mm) layers of DMPA and poly(ethylene glycol) diacrylate (PEG-DA) mixtures was assessed for 5.0 w/v% (grams per 100 mL) concentrations of DMPA dissolved in PEG-DA. The polymerization rate and quality of curing was found to decrease as the concentration of DMPA increased beyond 1.0 w/v%; thus, confirming the existence of an optimum photo-initiator concentration for a specific sheet thickness. The optimum photo-initiator concentration for a 3-3.1 mm thick sheet of PEG-DA microstructure was determined to be between 0.3 and 0.38 w/v% DMPA. The addition of 1,6-hexanediol or 1,3-butanediol to the optimum photo-initiator concentrated solution of DMPA and PEG-DA was found to increase the Tg of the samples; however, the samples could not fully cure within 40-50 s, which suggested a decrease in polymerization rate. Lastly, the DMPA photo-initiator does not produce gaseous byproducts and is translucent when fully cured, which makes it attractive for infusion with strengthening materials because quality light penetration is paramount to quick polymerization rates. It is recommended that more trials be conducted to evaluate the mechanical properties of the optimum curing rate for DMPA and PEG-DA microstructures as well as a mechanical property comparison following the addition of either of the two alcohols.
ContributorsPiper, Tyler Irvin (Author) / Green, Green (Thesis director) / Lind, Mary Laura (Committee member) / School of Sustainability (Contributor) / Chemical Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12
Description
Feed Your Senses is an illustrated book made to holistically communicate links between local food systems and cultural wellbeing. Food was the center of my household growing up; my mom’s love of food, cooking, and experimenting with flavors molded my palette from a young age. As I got older, I

Feed Your Senses is an illustrated book made to holistically communicate links between local food systems and cultural wellbeing. Food was the center of my household growing up; my mom’s love of food, cooking, and experimenting with flavors molded my palette from a young age. As I got older, I realized that everyone has a deeply personal relationship with their food - no matter what their upbringing. My developing interests in food took off when I started traveling and experiencing the uniqueness and vibrancy of food culture. Food became the object of every trip I took.

The summer after my Junior year, I studied abroad in Denmark and was given the opportunity to create my own research topic. My interest in Sustainability has always revolved around food, so I started thinking about ways that I could incorporate this interest with the geographical backdrop of Århus, Denmark. Food is a medium for so many uniquely human creations: celebrations, art, connection, and taste. Food is also a big driver of climate change, as the meat and agriculture industries account for more than half of all greenhouse gas emissions. However, I wanted to research more than food. I wanted to incorporate balance; a balance of local and global food systems, a balance of individual and community relationships, and a balance of science and art. I wanted to show how food is a driving force in achieving global sustainability and resilience.

After much contemplation, I began researching the connections between local food and community wellbeing in the city. I interviewed farm-to-table chefs, local farmers, farmer’s market vendors, street food vendors, and consumers on their relationships with food. The topic itself was flexible and open-ended enough so that each interviewee could relate it to their lives in a unique way. I loved the research so much that I decided to continue interviewing stakeholders in the Phoenix metropolitan area. Through the continuation of my research in Arizona, I was able to include a comparative element that offered a better perspective on the matter. I found that the history of the country itself has a significant influence on people’s mindsets and actions surrounding food and the environment. The common theme I heard from all interviewees, however, was their confidence in the power of food to unite people to one another and to the natural world.

I chose to create this illustrated book because my research experience was a whole and inseparable experience; it could never be fully expressed in words. I wanted my project to be an intellectual and visual map of my journey, inspiring the reader to go on a journey of their own. Therefore, I partnered with an undergraduate art student at Arizona State University, Sofia Reyes, to help create my vision. I shared my experiences, photos, and stories with her so that she could create the beautiful watercolor paintings that make the book so visually appealing and accessible to all demographics. The images act as a way of engaging all of our human senses, initiating a stronger connection to the material presented.

Creating this project was my favorite experience as an undergraduate, and I feel fortunate to be able to tell the stories of those intimately tied to the local food system. I am in the process of entering my book in various competitions including Writer’s Digest, Reader’s Favorites, The Food Sustainability Media Award, and The Indie Book Awards. I am also going on to publish the book through a small publishing company.
ContributorsSykes, Chloe (Author) / Cloutier, Scott (Thesis director) / MacFadyen, Joshua (Committee member) / School of Sustainability (Contributor) / School of Public Affairs (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description

As technology has evolved over time and the U.S. population increases each year, this thesis focuses on the ways in which food production has shifted from the original farm to table to industrialized, processed food systems. Through a rationalization perspective, this research looks to the history and repercussions of industrial

As technology has evolved over time and the U.S. population increases each year, this thesis focuses on the ways in which food production has shifted from the original farm to table to industrialized, processed food systems. Through a rationalization perspective, this research looks to the history and repercussions of industrial agriculture as it has shifted over time. The term over-industrialization is used to operationalize the state of our current production methods. These methods focus extensively on the least expensive and most rapid methods to produce large yields of food products and pay no mind to ethics, respect of culture, land, or quality of products. Today, there is a shroud the corporations have placed over food production to ensure a “what we can’t see doesn’t affect us” belief system. In this way, the thesis provides insight on past, current, and future methods of manufacturing. I conclude that although plausible alternatives are present, continued research and substantial producer and consumer changes must be our main priority.

ContributorsBrodkin, Emma (Author) / Keahey, Jennifer (Thesis director) / Perkins, Tracy (Committee member) / Barrett, The Honors College (Contributor) / School of Sustainability (Contributor) / School of Social and Behavioral Sciences (Contributor)
Created2023-05
Description
Local food sustainability has gained significant recent attention over the past decade. Considerable research points to a host of economic, social, and environmental benefits resulting from engagement with local food systems. These benefits are more apparent when contrasted with a model in which individuals participate in larger, non-local food systems

Local food sustainability has gained significant recent attention over the past decade. Considerable research points to a host of economic, social, and environmental benefits resulting from engagement with local food systems. These benefits are more apparent when contrasted with a model in which individuals participate in larger, non-local food systems for all or most of their food sourcing. As such, this project was designed to explore possible barriers, such as lack of awareness, to engagement in local foods among Arizona State University (ASU) students on the main Tempe campus. Furthermore, this creative project aimed to evaluate how a local foods program conducted in a university dining hall might impact students’ awareness and interest in local foods served on site.
ContributorsBakeman, Taylor Melissa (Author) / Wharton, Christopher (Thesis director) / Popova, Laura (Committee member) / College of Health Solutions (Contributor, Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
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Description
The purpose of this thesis is to imagine and predict the ways in which humans will utilize technology to feed the world population in the 21st century, in spite of significant challenges we have not faced before. This project will first thoroughly identify and explain the most pressing challenges the

The purpose of this thesis is to imagine and predict the ways in which humans will utilize technology to feed the world population in the 21st century, in spite of significant challenges we have not faced before. This project will first thoroughly identify and explain the most pressing challenges the future will bring in climate change and population growth; both projected to worsen as time goes on. To guide the prediction of how technology will impact the 21st century, a theoretical framework will be established, based upon the green revolution of the 20th century. The theoretical framework will summarize this important historical event, and analyze current thought concerning the socio-economic impacts of the agricultural technologies introduced during this time. Special attention will be paid to the unequal disbursement of benefits of this green revolution, and particularly how it affected small rural farmers. Analysis of the technologies introduced during the green revolution will be used to predict how 21st century technologies will further shape the agricultural sector. Then, the world’s current food crisis will be compared to the crisis that preceded the green revolution. A “second green revolution” is predicted, and the agricultural/economic impact of these advances is theorized based upon analysis of farming advances in the 20th century.
ContributorsWilson, Joshua J (Author) / Strumsky, Deborah (Thesis director) / Benjamin, Victor (Committee member) / Department of Supply Chain Management (Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
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Description
Solutions to mitigating the negative externalities of climate change are deemed necessary for a sustainable future. Residential community composting, such as the Community Compost Program at Vista del Sol, could potentially play an important role within Arizona State University’s (ASU) solution to develop a sustainable institution as programs aspire to

Solutions to mitigating the negative externalities of climate change are deemed necessary for a sustainable future. Residential community composting, such as the Community Compost Program at Vista del Sol, could potentially play an important role within Arizona State University’s (ASU) solution to develop a sustainable institution as programs aspire to develop sustainable behaviors and integrate environmentally positive practices within students’ lives. The research and review of how universities can utilize a residential community compost program to ignite sustainable action within on-campus communities could present helpful information for additional universities to implement on their own. This review will aim to tackle the research question: how can the operational functions of existing university residential composting programs and behavioral science research be implemented within the Community Compost Program at Arizona State University? The review from existing university residential composting programs and behavioral sciences will be completed to provide an explanation of how residential community composting can overall be effectively prompted.
ContributorsKovacs, Amelia (Author) / Wharton, Christopher (Thesis director) / Daniel, Fischer (Committee member) / School of Life Sciences (Contributor) / School of Sustainability (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2020-05
Description
Northwest Arkansas has a complex relationship with Indigeneity due to the erasure experience by the original inhabitants of the lands, and the presences of newly immigrated Indigenous groups such as the Marshallese people from the Republic of the Marshall Islands. Today, the Indigenous identity that is most commonly present within

Northwest Arkansas has a complex relationship with Indigeneity due to the erasure experience by the original inhabitants of the lands, and the presences of newly immigrated Indigenous groups such as the Marshallese people from the Republic of the Marshall Islands. Today, the Indigenous identity that is most commonly present within the Northwest Arkansas community are the Marshallese people. The reason as to why the original inhabitants of modern-day Northwest Arkansas are not the most prominently represented Indigenous group, is because of severe erasure, genocide, and systematic racism experienced by these people. This thesis will be investigating the Indigenous identities of Northwest Arkansas, which will include information on the first peoples and the modern-day presence of the Marshallese people. This thesis will particularly be focusing on the ways in which the legacy of colonialism and climate change have linked these groups in their displacement. Despite the differing time periods, the interconnectedness between these Indigenous populations’ experiences with colonialism and colonialist systems further demonstrates the threat that Indigenous populations still face today of erasure and continual oppression. Through both populations’ mutual experience with displacement and diaspora, this thesis will investigate how food can act as an essential connector between Indigenous individuals and their culture, as well as how food can be a form of reparations, healing, and future progress.
ContributorsHegde, Adeline (Author) / Nelson, Melissa (Thesis director) / Jakubczak, Laura (Committee member) / Barrett, The Honors College (Contributor) / School of Public Affairs (Contributor) / School of Sustainability (Contributor)
Created2023-12