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- All Subjects: Sustainability
- Genre: Masters Thesis
Description
The purpose of this study was to comprehend the global warming potential (GWP), cost variability, and competitiveness of steel with rising carbon taxes. Aluminum, glass fiber composite, and carbon fiber composite were chosen as competing materials. In order to compare the aforementioned factors, the GWP of several processes to produce steel, aluminum, and fiber composites was examined. Cost analyses of various methods were also carried out to determine their viability. Energy consumption data for each of the paths under consideration were taken from the literature for the study. To get the consistent GWP for traditional and decarbonized scenarios, the required energy is multiplied with corresponding energy source (natural gas or electricity). Even after accounting for the carbon tax and the weight-reduction factor, the results show that steel still has the lowest production costs, followed by aluminum, while fiber composites remain the most costly. EAF- steel and secondary aluminum has least GWP followed by H2-DRI (Hydrogen- Direct Reduced Iron)steel and NG-DRI (Natural Gas- Direct Reduced Iron) steel with carbon capture and storage (CCS). The state of art technology for glass fiber reinforced composite also emits less carbon dioxide but the cost of production is still high. Carbon fiber reinforced composite emits most carbon dioxide and is least economical.
ContributorsRajulwar, Vaishnavi Vijay (Author) / Seetharaman, Sridhar (Thesis advisor) / Emady, Heather (Committee member) / Nian, Qiong (Committee member) / Arizona State University (Publisher)
Created2023
Description
Concrete develops strength rapidly after mixing and is highly influenced by temperature and curing process. The material characteristics and the rate of property development, along with the exposure conditions influences volume change mechanisms in concrete, and the cracking propensity of the mixtures. Furthermore, the structure geometry (due to restraint as well as the surface area-to-volume ratio) also influences shrinkage and cracking. Thus, goal of this research is to better understand and predict shrinkage cracking in concrete slab systems under different curing conditions. In this research, different concrete mixtures are evaluated on their propensity to shrink based on free shrinkage and restrained shrinkage tests.Furthermore, from the data obtained from restrained ring test, a casted slab is measured for shrinkage. Effects of different orientation of restraints are studied and compared to better understand the shrinking behavior of the concrete mixtures. The results show that the maximum shrinkage is near the edges of the slab and decreases towards the center. Shrinkage near the edges with no restraint is found out to be more than the shrinkage towards the edges with restraining effects.
ContributorsNimbalkar, Atharwa Samir (Author) / Neithalath, Narayanan (Thesis advisor) / Mobasher, Barzin (Thesis advisor) / Rajan, Subramaniam (Committee member) / Arizona State University (Publisher)
Created2023
Description
Human activity, such as industrialization and deforestation, have led to an increase in global temperatures and natural disaster events that have resulted in the death of over two million people and an economic loss of over USD $3.64 trillion in the last 50 years. Governments, organizations, and activists across the globe have tried to reduce the collateral consequences of human activity on the planet; however, even with increased attention to these issues, there has yet to be much discussion of accountability for planetary harm. Greenhouse gas emissions, waste dumping, and climate change mostly result from individuals, corporations, and governments exploiting the planet of its natural resources freely, without direct and immediate consequence. In the field of criminal justice, the criminalization of and penalization for engagement in certain acts is meant to deter harmful acts. Therefore, to deter auto-genocide, one must ask whether perpetrators of global harm should be held accountable, and what accountability might look like in these scenarios. This article explores traditional definitions of “crime,” punishment, and the criminal label, and discusses the possibility of holding perpetrators of ecocide and the impending auto-genocide accountable utilizing a restorative justice framework.
ContributorsMenes, Norliyana (Author) / Henson, Abigail (Thesis advisor) / Chamberlain, Alyssa W (Committee member) / Blount-Hill, Kwan-Lamar (Committee member) / Arizona State University (Publisher)
Created2023
Description
Corporate social responsibility (CSR) has been lauded as a sustainable framework through which corporations can contribute to society. However, in the wake of global social justice movements, society demands that corporations take a stance on social ills to contribute to a just society. The concept of corporate social justice (CSJ) has been introduced to frame such endeavors, although it has yet to be extensively applied to the tourism industry. Drawing on the conceptual framework of corporate social justice, this study explores how CSJ principles, including accountability, transparency, impact, and sustainability, inform the business operations of eco-rated tourism enterprises in Maasai Mara, Kenya. Ecotourism Kenya, the eco-rating agency, has guidelines for eco-rated facilities on community engagement and development that require these businesses to commit to: investing in people; implementing empowerment programs for local populations; and supporting community economic linkages. The study adopted a case study research design using Maasai Mara in Kenya as a site of inquiry. Guided by a constructivist epistemological lens, data was collected through semi-structured interviews with management officials operating the eco-rated tourism businesses and Maasai community members residing in the vicinity. Purposive sampling was used to select participants from eco-rated tourism businesses, whereas a combination of snowball and convenience sampling techniques was utilized in selecting key informants from the Maasai community. Accordingly, twelve participants from eco-rated businesses and eighteen Maasai community participants took part in this study. The findings indicated that eco-rated tourism businesses in Maasai Mara engaged with the tenets of CSJ, albeit in predominantly business-focused ways. Further findings also revealed other factors that seemed to influence the local community’s appreciation of the community empowerment initiatives by eco-rated businesses. These factors included: human-wildlife conflict, corrupt reserve land dealings, and exploitation of Maasai trade by some local tourism actors. Based on the findings, this study recommends that eco-rated tourism businesses in Maasai Mara enhance their engagement with the tenets of CSJ to reflect community-centered initiatives. Moreover, a keen reassessment of multi-stakeholder influences on the Maasai community’s full appreciation of benefits from eco-rated tourism businesses should be undertaken to propel further implementation of action-oriented solutions for the community.
ContributorsChepkwony, Mercy (Author) / Buzinde, Christine N (Thesis advisor) / Bricker, Kelly S (Committee member) / Nyaupane, Gyan (Committee member) / Arizona State University (Publisher)
Created2023
Description
The COVID-19 pandemic arguably affected the travel industry more than any other global industry. In what felt like overnight, both domestic and international travel was halted due to the spread of the virus. Travel organizations, such as The Travel Corporation, had to learn to adapt and create policies and procedures to help mitigate the consequences of the pandemic. This qualitative research examines the effects of the COVID-19 pandemic on the travel industry to provide an understanding of future travel implications and restrictions for travelers and guided travel companies, utilizing The Travel Corporation as an example. A total of 36 employees of The Travel Corporation were surveyed regarding their views on how the company handled the pandemic. The research shows that the travel industry needs to have policies in place that ensure resilience against any future catastrophes.
ContributorsBurg, Amber Dawn (Author) / Akpan-Obong, Patience (Thesis advisor) / Veach, Paula (Thesis advisor) / Todd, Megan (Committee member) / Arizona State University (Publisher)
Created2023
Description
Contemporary renewable energy transitions require the extraction of critical minerals necessary to produce new green technologies. The Stibnite Gold Project located in Valley County, Idaho, is one of many proposed mine sites to supply raw materials for renewable energy infrastructure. A variety of actors including the mine operator, Perpetua Resources, use varying approaches to risk to measure the impacts of potential mine operations. A formal permitting process facilitated by US regulatory bodies assess these risks and proposals for their mitigation. This study examines the permitting process for the proposed mine, the Stibnite Gold Project, in Idaho in order to better understand what risks are considered and how they are conceptualized. Specifically, it examines public discourse from the mine operator Perpetua Resources, key regulators, key NGOs, and the Nez Perce tribal community. A critical discourse analysis reveals the development of distinct risk, economic, restorative, and decision authority narratives among each actor. These narratives shape approaches to risk. However, they also reveal settler colonialism and other intersecting systems of oppression are reinstated and/or resisted in each actors approach to risk. Drawing on existing literature as well as new empirical data from the discourse analysis, this study shows limits to prevailing approaches to risk that need to be addressed so that future efforts to advance sustainability-driven renewable energy transitions do not impose unjust costs on Indigenous peoples.
ContributorsStempel, Khampha (Author) / Calhoun, Craig (Thesis advisor) / Carralero, Pamela (Committee member) / Klinsky, Sonja (Committee member) / Nelson, Melissa (Committee member) / Arizona State University (Publisher)
Created2023
Description
This paper will explore the existing relationship between direct air capture (DAC)technology and energy justice (EJ) principles. As DAC is a nascent technology that is
transitioning from the R&D phase to the deployment phase, a standard for typical scaling
practices has not yet been established. Additionally, since the industry of DAC aims to
capture at least 10 gigatonnes of carbon dioxide per year by 2050, and at least 20 Gt/yr by
2100, the scaling practices of this technology will have a significant impact on
communities around the world. Therefore, in this thesis I argue that if DAC is not scaled
equitably, it will negatively impact the communities hosting the technology, and would
develop a negative reputation which could slow down the overall scaling process. On the
flip side, if DAC is scaled equitably, then it could create a positive effect by being
deployed in underserved and marginalized communities and providing an economic
benefit. This could result in DAC having a positive reputation and scaling more rapidly.
In order to understand how the field viewed the integration of EJ principles into the
scaling process, I interviewed representatives from DAC companies, experts in energy
justice from NGOs and academia, and local government officials. These interviews were
semi-structured, open-ended and conducted anonymously. Through these interviews I
was able to refine my arguments and put forward a set of guidelines that the industry
could use to scale DAC with equity and justice as core principles.
ContributorsSriramprasad, Vishrudh (Author) / Lackner, Klaus S (Thesis advisor) / Miller, Clark (Committee member) / Green, Matt (Committee member) / Hanemann, Michael (Committee member) / Arizona State University (Publisher)
Created2023
Description
Promoting human wellbeing is a core tenet of human development and sustainability research and practice. The COVID-19 pandemic provided a unique opportunity to examine drivers of distinct aspects of wellbeing in an urban setting. Understanding how nature interactions impact human wellbeing is pertinent during the pandemic given the abrupt changes in lifestyle and anxiety experienced by many people. Through a quantitative analysis of 2021 survey data in metropolitan Phoenix, Arizona, I explored how distinct nature recreation activities, along with nature satisfaction and social capital in their neighborhoods, affected residents’ wellbeing during the COVID-19 pandemic. To conceptualize wellbeing holistically, I employed a tripartite model of health encompassing subjective wellbeing, physical health, and mental health. Data from the 2021 Phoenix Area Social Survey were analyzed coupled with geospatial environmental factors that linked to survey respondents. With linear and logistic regression models, I examined how different types of nature recreation, along with local environmental and social factors, influence Phoenix residents’ life satisfaction, common health diagnoses, and depression and anxiety.
Results indicate that perceived social and environmental attributes of neighborhoods and proximity to desert preserves had a more significant impact on subjective wellbeing than nature recreation. Age and park visitation largely influenced physical health, while socio-demographic factors had the largest impact on mental health. Changes in nature recreation during the COVID-19 pandemic did not significantly impact any dimension of wellbeing among the survey sample. This research demonstrates that distinct aspects of wellbeing have different drivers, and multiple environmental and social features should be considered when designing happy and healthy communities. Additionally, the design and management of human‒environment dynamics at the local level can improve residents’ subjective wellbeing. Research should continue investigating trends and drivers of human wellbeing to support sustainability goals into the future in order to promote wellbeing in urban communities.
ContributorsMitchell, Abigail Jenn Holst (Author) / Larson, Kelli L (Thesis advisor) / Rosales Chavez, Jose-Benito (Committee member) / Pfeiffer, Deirdre (Committee member) / Arizona State University (Publisher)
Created2023
Description
With the demand growing for more sustainable forms of energy in replacement of fossil fuels, a major obstacle arises in the end-of life solar modules that are disposed of in landfills. Aside from the hazardous materials, silicon solar modules contain valuable and scarce materials such as silver. Silver is used in many industries and many applications therefore the recycling and recovering of it is financially beneficial. The purpose of this research was to achieve high purity and recovery of silver using hydrofluoric acid. The following work presents the feasibility of silver recovery through the process of leaching and electrowinning by examining the percent recovery and cathodic coulombic efficiency, followed by a chemical analysis to determine the purity. Varying conditions in leaching and electrowinning parameters are conducted in a synthetic solution to determine the effect on silver recovery and cathodic coulombic efficiency. It was determined that the silver recovery was dependent on the applied potential, system configuration and time. The system is capable of recovery rates of over 95% at -1 V. The system is further tested on solar cells to prove that silver can be recovered. There was over 99% purity from the experiments conducted in synthetic solution and from solar cells. Additionally, a circular chemistry is proposed that allows the reuse of hydrofluoric acid for leaching and electrowinning.
ContributorsChen, Theresa (Author) / Tao, Meng (Thesis advisor) / Deng, Shuguang (Committee member) / Goryll, Michael (Committee member) / Arizona State University (Publisher)
Created2024
Description
Globally, land use change is the primary driver of biodiversity loss (IPBES, 2019). Land use change due to agricultural expansion is driving bird species to the brink of extinction in the Peruvian Amazon rainforest. Agriculture is one of the primary threats to bird species in the region, and agroforestry is being pursued in some communities as a potential solution to reduce agriculture's impacts on species, as agroforestry provides improved habitat for wildlife while also enabling livelihoods for people. Understanding how anthropogenic land use choices affect imperiled species is an important prerequisite for conservation policy and practice in the region. In this thesis, I develop a spatial model for quantifying expected threat abatement from shifting agricultural land use choices towards agroforestry. I used this model explored how agricultural land use impacts imperiled bird species in the Peruvian Amazon. My approach builds on the species threat abatement and restoration (STAR) metric to make the expected consequences of reducing agricultural threats spatially explicit. I then analyzed results of applying the metric to alternative scenarios with and without agroforestry conversion. I found that agroforestry could result in up to 18.68% reduction in mean bird projected population decline. I found that converting all terrestrial agriculture in the Peruvian Amazon to agroforestry could produce a benefit of up to 83% to imperiled birds in the region in terms of improvement in Red List status. This use of the STAR metric to model alternative scenarios presents a novel usage for the STAR metric and a promising approach to understand how to address terrestrial biodiversity challenges efficiently and effectively.
ContributorsPoe, Katherine (Author) / Iacona, Gwen (Thesis advisor) / Gerber, Leah (Thesis advisor) / Mair, Louise (Committee member) / Arizona State University (Publisher)
Created2023