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- Creators: School of Politics and Global Studies
- Creators: Neithalath, Narayanan
Description
Alkali-activated aluminosilicates, commonly known as "geopolymers", are being increasingly studied as a potential replacement for Portland cement. These binders use an alkaline activator, typically alkali silicates, alkali hydroxides or a combination of both along with a silica-and-alumina rich material, such as fly ash or slag, to form a final product with properties comparable to or better than those of ordinary Portland cement. The kinetics of alkali activation is highly dependent on the chemical composition of the binder material and the activator concentration. The influence of binder composition (slag, fly ash or both), different levels of alkalinity, expressed using the ratios of Na2O-to-binders (n) and activator SiO2-to-Na2O ratios (Ms), on the early age behavior in sodium silicate solution (waterglass) activated fly ash-slag blended systems is discussed in this thesis. Optimal binder composition and the n values are selected based on the setting times. Higher activator alkalinity (n value) is required when the amount of slag in the fly ash-slag blended mixtures is reduced. Isothermal calorimetry is performed to evaluate the early age hydration process and to understand the reaction kinetics of the alkali activated systems. The differences in the calorimetric signatures between waterglass activated slag and fly ash-slag blends facilitate an understanding of the impact of the binder composition on the reaction rates. Kinetic modeling is used to quantify the differences in reaction kinetics using the Exponential as well as the Knudsen method. The influence of temperature on the reaction kinetics of activated slag and fly ash-slag blends based on the hydration parameters are discussed. Very high compressive strengths can be obtained both at early ages as well as later ages (more than 70 MPa) with waterglass activated slag mortars. Compressive strength decreases with the increase in the fly ash content. A qualitative evidence of leaching is presented through the electrical conductivity changes in the saturating solution. The impact of leaching and the strength loss is found to be generally higher for the mixtures made using a higher activator Ms and a higher n value. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) is used to obtain information about the reaction products.
ContributorsChithiraputhiran, Sundara Raman (Author) / Neithalath, Narayanan (Thesis advisor) / Rajan, Subramaniyam D (Committee member) / Mobasher, Barzin (Committee member) / Arizona State University (Publisher)
Created2012
Description
The alkali activation of aluminosilicate materials as binder systems derived from industrial byproducts have been extensively studied due to the advantages they offer in terms enhanced material properties, while increasing sustainability by the reuse of industrial waste and byproducts and reducing the adverse impacts of OPC production. Fly ash and ground granulated blast furnace slag are commonly used for their content of soluble silica and aluminate species that can undergo dissolution, polymerization with the alkali, condensation on particle surfaces and solidification. The following topics are the focus of this thesis: (i) the use of microwave assisted thermal processing, in addition to heat-curing as a means of alkali activation and (ii) the relative effects of alkali cations (K or Na) in the activator (powder activators) on the mechanical properties and chemical structure of these systems. Unsuitable curing conditions instigate carbonation, which in turn lowers the pH of the system causing significant reductions in the rate of fly ash activation and mechanical strength development. This study explores the effects of sealing the samples during the curing process, which effectively traps the free water in the system, and allows for increased aluminosilicate activation. The use of microwave-curing in lieu of thermal-curing is also studied in order to reduce energy consumption and for its ability to provide fast volumetric heating. Potassium-based powder activators dry blended into the slag binder system is shown to be effective in obtaining very high compressive strengths under moist curing conditions (greater than 70 MPa), whereas sodium-based powder activation is much weaker (around 25 MPa). Compressive strength decreases when fly ash is introduced into the system. Isothermal calorimetry is used to evaluate the early hydration process, and to understand the reaction kinetics of the alkali powder activated systems. A qualitative evidence of the alkali-hydroxide concentration of the paste pore solution through the use of electrical conductivity measurements is also presented, with the results indicating the ion concentration of alkali is more prevalent in the pore solution of potassium-based systems. The use of advanced spectroscopic and thermal analysis techniques to distinguish the influence of studied parameters is also discussed.
ContributorsChowdhury, Ussala (Author) / Neithalath, Narayanan (Thesis advisor) / Rajan, Subramanium D. (Committee member) / Mobasher, Barzin (Committee member) / Arizona State University (Publisher)
Created2013
Description
This paper explains what factors influence mental health issues and what type of care is provided in various countries. The countries in this study will include the United States, Japan, Ethiopia and South Africa, all of which have varying degrees of ethnic diversity, economic status and understanding of mental health issues. It discusses the specific healthcare systems in each country, as well as the attitudes and problems associated with depression and schizophrenia, two prevalent mental health disorders. This paper examines the different ways that a diagnosis is reached for schizophrenia and major depression in these different countries, as well as what methods are used for treating individuals with these disorders. It will also examine the prominent notion that schizophrenia has better outcomes in developing countries than in places that have wider medical care available. It then discusses what treatments are available in each country, as well as social constructs that exist regarding those treatments in order to understand the ways that treatments can be expanded to improve outcomes. This paper will then examine the different outcomes of these mental health disorders that are common in each country, and conclude with ideas on how to make global mental health a reality.
ContributorsOlsen, Rachel Lindsay (Author) / Gaughan, Monica (Thesis director) / Wood, Reed (Committee member) / Barrett, The Honors College (Contributor) / School of Politics and Global Studies (Contributor) / School of Human Evolution and Social Change (Contributor) / Department of Psychology (Contributor)
Created2015-05
Description
What is known about the lives, and especially the private lives, of English women in the early modern era is not at all satisfactory in terms of sources, scope, or understanding. Because the act of writing and reading was already exclusive to the upper classes, what sources do survive are not representative of the majority of the female population, leading to more speculation on behalf of historians. The sources which do survive, by and large focus on the role of religion and spirituality in a woman's life, since it was the most acceptable reason for an early modern woman to be writing about. However, I hoped to prove how women were interested in more than just self-improvement through religious devotion, thereby demonstrating that early modern English women were as complex and rich in personality and interests as a modern woman might consider herself to be. After a brief introduction and explanation of the research process, this project then begins to individually analyze the three women who were chosen for study based on their mutual practice of keeping a diary during their lives in early modern England. These women were Elizabeth Freke, Lady Sarah Cowper, and Mary, Countess Cowper, all of whom operated within the feminine social hierarchy during this period, but each of whom demonstrated a particular interest beyond that of marriage and family, including economics, religion, and politics. I believe that each woman analyzed proved how unique and varied the lives of early modern English women were through their writings.
ContributorsVetterl, Victoria Lee (Author) / Warnicke, Retha (Thesis director) / Looser, Devoney (Committee member) / Department of English (Contributor) / School of Historical, Philosophical and Religious Studies (Contributor) / School of Politics and Global Studies (Contributor) / School of International Letters and Cultures (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
This study examined associations between Latino parents' cultural orientation and their behaviors in support of their 9th grade adolescents in science (n= 104). Parents reported their orientation to mainstream U.S. and Latino culture, traditional cultural values, and immigration status. Adolescents reported how often their parents engaged with them in science related behaviors, such as general positive support in science, school involvement, teaching them things about science, discussing the future, and engaging in science-related co-activity. Results indicate that adolescent boys whose parents lack U.S. documentation are in greatest need of parent support in science.
ContributorsGastelum, Alexandra Nicole (Author) / Simpkins, Sandra (Thesis director) / Updegraff, Kimberly (Committee member) / Barrett, The Honors College (Contributor) / School of Politics and Global Studies (Contributor) / School of Social Transformation (Contributor)
Created2014-05
Description
If democracy is the best way to rule why then is it limited only to the political sphere? This question is central to economic democracy which is the theory that economic activities should be governed by democratic principles. In America, ESOPs are used for a variety of reasons, and I believe that they can be used for the development of democratic firms. My thesis looks at current ESOPs to see if they are democratic, and suggests how they can be used to develop democratic firms.
ContributorsHeth, Zachary Fredrick (Author) / Simhony, Avital (Thesis director) / Lennon, Tara (Committee member) / Barrett, The Honors College (Contributor) / Department of Chemistry and Biochemistry (Contributor) / School of Politics and Global Studies (Contributor) / School of Life Sciences (Contributor)
Created2014-05
Description
Japanese animated film director Hayao Miyazaki is famous for his numerous film featuring female protagonists. These protagonists have been examined for their conformance and deviance with regard to widespread stereotypes of masculine and feminine traits. Miyazaki's female characters tend to exhibit nuanced and varied traits, with a balance of traditionally masculine and feminine characteristics. They also tend to demonstrate and moralize on larger social issues such as environmentalism and gender equality, advancing ideals for both Japanese and Western feminism. The status of these female protagonists as cultural icons is contrary to wider film trends that exclude women from the spotlight except when they conform to rigid gender roles.
ContributorsNevitt, Stephanie Nicole (Author) / Facinelli, Diane (Thesis director) / Creamer, John (Committee member) / Whitesman, Linda (Committee member) / Barrett, The Honors College (Contributor) / School of International Letters and Cultures (Contributor) / School of Politics and Global Studies (Contributor)
Created2013-05
Description
Congress has grown increasingly partisan since the 1970's, with the most extreme levels of partisanship occurring in the last few years. The media has also reflected on the loss of bipartisanship in Congress. However, the media often cites women as one of the last groups in the Senate willing to cross party lines. I analyze party unity scores from 1993-2013 to see if women senators are less partisan than their male counterparts, and if Democratic women senators are more or less partisan than Republican women senators. From these results, I find that Republican female senators are less partisan than Republican male senators and Democratic senators of either gender. I also find Democratic female senators are more partisan than Republican female senators, and just as partisan or more partisan than Democratic male senators. However, when analyzed through co-sponsorship data from 2009-2015, women senators are seen as more bipartisan than men. Finally, through anecdotal research, I find that both Republican and Democratic men and women in the Senate believe women legislate differently than men and view them as more willing to find common ground. I also find Republican and Democratic women of the Senate have shared experiences that lead them to forge bipartisan relationships that could lead them to work in a more bipartisan way. An interview with former Senator Olympia Snowe reveals that she believes women are results oriented and willing to work together on a range of issues, and especially those that benefit women.
ContributorsBennett, Linnea Christine (Author) / Woodall, Gina (Thesis director) / Lennon, Tara (Committee member) / Barrett, The Honors College (Contributor) / School of Politics and Global Studies (Contributor)
Created2015-05
Description
The media often portrays and the public often percieves white women and women of color politicians experience feminist obstacles, such as the masculine-feminine double bind and being dehumanized in the same way. Many of these representations of women of color politicians in society do not incorporate the impact of intersectionality and confining gender schemas; therefore, women of color politician’s experiences are often lumped together with that of their white women counterparts. This phenomenon ultimately contributes to the persistence of color-blind racism in the United States, which negatively effects the life outcomes of women of color politicians and women of color in general. In effort to help lessen the effects of color-blind racism locally and in government, some tools on how to reflect on one’s own biases are provided and avenues for change are proposed.
ContributorsCook, Caroline Matie (Author) / Sturgess, Jessica (Thesis director) / O'Flaherty, Katherine (Committee member) / Hugh Downs School of Human Communication (Contributor) / School of Politics and Global Studies (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
Description
Time studies are an effective tool to analyze current production systems and propose improvements. The problem that motivated the project was that conducting time studies and observing the progression of components across the factory floor is a manual process. Four Industrial Engineering students worked with a manufacturing company to develop Computer Vision technology that would automate the data collection process for time studies. The team worked in an Agile environment to complete over 120 classification sets, create 8 strategy documents, and utilize Root Cause Analysis techniques to audit and validate the performance of the trained Computer Vision data models. In the future, there is an opportunity to continue developing this product and expand the team’s work scope to apply more engineering skills on the data collected to drive factory improvements.
Contributorsde Guzman, Lorenzo (Co-author) / Chmelnik, Nathan (Co-author) / Martz, Emma (Co-author) / Johnson, Katelyn (Co-author) / Ju, Feng (Thesis director) / Courter, Brandon (Committee member) / Industrial, Systems & Operations Engineering Prgm (Contributor, Contributor) / School of Politics and Global Studies (Contributor) / Industrial, Systems & Operations Engineering Prgm (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2021-05