Matching Items (640)
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Dynamic loading is the term used for one way of optimally loading a transformer. Dynamic loading means the utility takes into account the thermal time constant of the transformer along with the cooling mode transitions, loading profile and ambient temperature when determining the time-varying loading capability of a transformer. Knowing

Dynamic loading is the term used for one way of optimally loading a transformer. Dynamic loading means the utility takes into account the thermal time constant of the transformer along with the cooling mode transitions, loading profile and ambient temperature when determining the time-varying loading capability of a transformer. Knowing the maximum dynamic loading rating can increase utilization of the transformer while not reducing life-expectancy, delaying the replacement of the transformer. This document presents the progress on the transformer dynamic loading project sponsored by Salt River Project (SRP). A software application which performs dynamic loading for substation distribution transformers with appropriate transformer thermal models is developed in this project. Two kinds of thermal hottest-spot temperature (HST) and top-oil temperature (TOT) models that will be used in the application--the ASU HST/TOT models and the ANSI models--are presented. Brief validations of the ASU models are presented, showing that the ASU models are accurate in simulating the thermal processes of the transformers. For this production grade application, both the ANSI and the ASU models are built and tested to select the most appropriate models to be used in the dynamic loading calculations. An existing application to build and select the TOT model was used as a starting point for the enhancements developed in this work. These enhancements include:  Adding the ability to develop HST models to the existing application,  Adding metrics to evaluate the models accuracy and selecting which model will be used in dynamic loading calculation  Adding the capability to perform dynamic loading calculations,  Production of a maximum dynamic load profile that the transformer can tolerate without acceleration of the insulation aging,  Provide suitable output (plots and text) for the results of the dynamic loading calculation. Other challenges discussed include: modification to the input data format, data-quality control, cooling mode estimation. Efforts to overcome these challenges are discussed in this work.
ContributorsLiu, Yi (Author) / Tylavksy, Daniel J (Thesis advisor) / Karady, George G. (Committee member) / Ayyanar, Raja (Committee member) / Arizona State University (Publisher)
Created2011
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The development of a Solid State Transformer (SST) that incorporates a DC-DC multiport converter to integrate both photovoltaic (PV) power generation and battery energy storage is presented in this dissertation. The DC-DC stage is based on a quad-active-bridge (QAB) converter which not only provides isolation for the load, but also

The development of a Solid State Transformer (SST) that incorporates a DC-DC multiport converter to integrate both photovoltaic (PV) power generation and battery energy storage is presented in this dissertation. The DC-DC stage is based on a quad-active-bridge (QAB) converter which not only provides isolation for the load, but also for the PV and storage. The AC-DC stage is implemented with a pulse-width-modulated (PWM) single phase rectifier. A unified gyrator-based average model is developed for a general multi-active-bridge (MAB) converter controlled through phase-shift modulation (PSM). Expressions to determine the power rating of the MAB ports are also derived. The developed gyrator-based average model is applied to the QAB converter for faster simulations of the proposed SST during the control design process as well for deriving the state-space representation of the plant. Both linear quadratic regulator (LQR) and single-input-single-output (SISO) types of controllers are designed for the DC-DC stage. A novel technique that complements the SISO controller by taking into account the cross-coupling characteristics of the QAB converter is also presented herein. Cascaded SISO controllers are designed for the AC-DC stage. The QAB demanded power is calculated at the QAB controls and then fed into the rectifier controls in order to minimize the effect of the interaction between the two SST stages. The dynamic performance of the designed control loops based on the proposed control strategies are verified through extensive simulation of the SST average and switching models. The experimental results presented herein show that the transient responses for each control strategy match those from the simulations results thus validating them.
ContributorsFalcones, Sixifo Daniel (Author) / Ayyanar, Raja (Thesis advisor) / Karady, George G. (Committee member) / Tylavsky, Daniel (Committee member) / Tsakalis, Konstantinos (Committee member) / Arizona State University (Publisher)
Created2011
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Advancements in computer vision and machine learning have added a new dimension to remote sensing applications with the aid of imagery analysis techniques. Applications such as autonomous navigation and terrain classification which make use of image classification techniques are challenging problems and research is still being carried out to find

Advancements in computer vision and machine learning have added a new dimension to remote sensing applications with the aid of imagery analysis techniques. Applications such as autonomous navigation and terrain classification which make use of image classification techniques are challenging problems and research is still being carried out to find better solutions. In this thesis, a novel method is proposed which uses image registration techniques to provide better image classification. This method reduces the error rate of classification by performing image registration of the images with the previously obtained images before performing classification. The motivation behind this is the fact that images that are obtained in the same region which need to be classified will not differ significantly in characteristics. Hence, registration will provide an image that matches closer to the previously obtained image, thus providing better classification. To illustrate that the proposed method works, naïve Bayes and iterative closest point (ICP) algorithms are used for the image classification and registration stages respectively. This implementation was tested extensively in simulation using synthetic images and using a real life data set called the Defense Advanced Research Project Agency (DARPA) Learning Applied to Ground Robots (LAGR) dataset. The results show that the ICP algorithm does help in better classification with Naïve Bayes by reducing the error rate by an average of about 10% in the synthetic data and by about 7% on the actual datasets used.
ContributorsMuralidhar, Ashwini (Author) / Saripalli, Srikanth (Thesis advisor) / Papandreou-Suppappola, Antonia (Committee member) / Turaga, Pavan (Committee member) / Arizona State University (Publisher)
Created2011
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Partisan politics has created an increasingly polarized political climate in the United States. Despite the divisive political climate, women’s representation in politics has also increased drastically over the years. I began this project to see if there is a partisan rivalry between women in politics or a sense of shared

Partisan politics has created an increasingly polarized political climate in the United States. Despite the divisive political climate, women’s representation in politics has also increased drastically over the years. I began this project to see if there is a partisan rivalry between women in politics or a sense of shared “womanhood.” This thesis explores the role political parties play for women in office by examining how they vote on bills, what type of bills they propose, and whether or not they work collaboratively with their female counterparts at the Arizona State Legislature. My main goals for this project are to see how strong or weak political parties are in shaping political behavior at the Arizona State Legislature and to determine if there is a sense of “womanhood” despite different political affiliations. I also explore the role party affiliation plays within women legislators at the Arizona State Legislature.

ContributorsSanson, Claudia Maria (Author) / Lennon, Tara (Thesis director) / Woodall, Gina (Committee member) / School of Public Affairs (Contributor) / Department of English (Contributor) / School of Politics and Global Studies (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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In recent years, immigration, especially concerning those individuals immigrating from Central America and Mexico, has become increasingly controversial. Within the last five presidents, policies concerning immigration have shifted. Under President Bill Clinton in 1997, the Flores Settlement, an agreement between immigration activist organizations and the government that created standards for

In recent years, immigration, especially concerning those individuals immigrating from Central America and Mexico, has become increasingly controversial. Within the last five presidents, policies concerning immigration have shifted. Under President Bill Clinton in 1997, the Flores Settlement, an agreement between immigration activist organizations and the government that created standards for detaining accompanied and unaccompanied minors was made. Following 9/11, in 2005, President George W. Bush increased the amount of money spent on immigration enforcement in an effort to deport more immigrants. President Barack Obama increased the number of deportations from President Bush during his first term. However, in 2014, an already imperfect immigration system was disrupted by an influx of child immigrants. As a result, detention centers were at capacity and unable to accommodate the increasing numbers of immigrants. Child migrants were placed in caged-areas, immigration lawyers and courts quickly became overwhelmed with cases, and children were alone and could barely communicate. This thesis explores the various relationships between accompanied and unaccompanied minors from Central America, the American legal system, and the media and broadcast news outlets’ rhetoric concerning child migrants. Focusing on the ways in which immigrant minors are objectified by the legal system and the framing of immigrants in the media, it is evident that their complex interaction allows for the oppression of the child migrants. Since the American legal system and the media influence and respond to each other, the responsibility of the child migrants’ dehumanization is on both the legal system and the rhetoric of the media and broadcast news outlets.

ContributorsValli-Doherty, Francesca (Author) / Soares, Rebecca (Thesis director) / Agruss, David (Committee member) / School of Public Affairs (Contributor) / Department of English (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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This project is a critical analysis of the works of 6 American war veterans and how they demonstrate trauma in their narratives. The texts covered here are Philip Red Eagle’s Red Earth (2007), John A. Williams’ Captain Blackman (1972), Roy Scranton’s War Porn (2016), Tim O’Brien’s The Things They

This project is a critical analysis of the works of 6 American war veterans and how they demonstrate trauma in their narratives. The texts covered here are Philip Red Eagle’s Red Earth (2007), John A. Williams’ Captain Blackman (1972), Roy Scranton’s War Porn (2016), Tim O’Brien’s The Things They Carried (1990), Kurt Vonnegut’s Slaughterhouse-Five (1969), and Joseph Heller’s Catch-22 (1961).

ContributorsNovinger, Joshua (Author) / Ellis, Lawrence (Thesis director) / Goodman, Brian (Committee member) / Department of English (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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Claiming Impossible Bodies is a collection of poetry and collage exploring gender and sexuality through the lens of the vampire. For this project, I researched various representations of the vampires through folklore, classical and modern literature, film, and pop culture. The liminality of the vampire allows such figures to take

Claiming Impossible Bodies is a collection of poetry and collage exploring gender and sexuality through the lens of the vampire. For this project, I researched various representations of the vampires through folklore, classical and modern literature, film, and pop culture. The liminality of the vampire allows such figures to take different forms and identities, ranging from dark and grotesque creatures, such as the succubus or incubus from mythology, to modern sex-icons, like Edward Cullen from the Twilight Saga. Considering this wide range of performances by vampiric figures throughout history, the poems in this manuscript seek to deconstruct the binaries that vampires live between and expose the liminality in social norms that attempt to define our identities and shape our performances.

ContributorsWitter, Genevieve Michelle (Author) / Ball, Sally (Thesis director) / Meinen, Avery (Committee member) / Department of English (Contributor) / School of International Letters and Cultures (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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For this Creative Project, I decided to explore the elements that set novellas apart from other genres and then experiment writing in the form. In doing so, I took into account three main categories: Plot Structure, Character Development, Style/Format, and then used my findings to write 45 pages of a

For this Creative Project, I decided to explore the elements that set novellas apart from other genres and then experiment writing in the form. In doing so, I took into account three main categories: Plot Structure, Character Development, Style/Format, and then used my findings to write 45 pages of a novella titled Emmy and Me.

ContributorsBingham, Roxanne Marie (Author) / Irish, Jennifer (Thesis director) / Danielson, Jonathan (Committee member) / Department of English (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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The United States is an empire. It was founded as such and continues to be one to this day. However, during the most prominent periods of imperial expansion, anti-imperialist organizations and politicians often rise up to oppose these further imperialist actions. This thesis paper examines the rhetoric used by these

The United States is an empire. It was founded as such and continues to be one to this day. However, during the most prominent periods of imperial expansion, anti-imperialist organizations and politicians often rise up to oppose these further imperialist actions. This thesis paper examines the rhetoric used by these organizations and politicians, particularly through their speeches and platforms. The primary focus is on the role of American exceptionalism in this rhetoric, and what American anti-imperialism not rooted in this concept looks like. This analysis will be done by looking at a few key specific texts from these organizations and politicians, including (but not limited to) the platform of the Anti-Imperialist League and the speech Representative Barbara Lee gave to explain her lone no vote on the Authorization for Use of Military Force in Afghanistan in 2001.

ContributorsRemelius, Justin (Author) / Avina, Alexander (Thesis director) / Goodman, Brian (Committee member) / Historical, Philosophical & Religious Studies (Contributor, Contributor) / School of Politics and Global Studies (Contributor, Contributor) / Historical, Philosophical & Religious Studies, Sch (Contributor, Contributor) / Department of English (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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In this essay, I set out to explore and analyze how Shirley Jackson’s The Haunting of Hill House, and the character of Eleanor Vance in particular, disrupts and redefines the traditional conventions of the Female Gothic within the context of the 20th century. I utilize Tania Modleski's gendering of Freud's

In this essay, I set out to explore and analyze how Shirley Jackson’s The Haunting of Hill House, and the character of Eleanor Vance in particular, disrupts and redefines the traditional conventions of the Female Gothic within the context of the 20th century. I utilize Tania Modleski's gendering of Freud's theory of psychoanalysis in her exploration of the ‘Female Uncanny,’ arguing that the source of the Uncanny in the Female Gothic can be found in the "fear of being lost in the mother." I argue that Jackson's complex personal life, including her fraught relationship with her mother and her difficult marriage with literary critic Edgar Hyman, color her fiction and the primary motivations of her protagonist, Eleanor Vance. I also outline the traditional structure of the Gothic novel and the heroine's journey. With the necessary context provided, I then explain how Eleanor Vance’s character rejects these Gothic traditions and ushers in a new era of Female Gothic fiction.

ContributorsAlcantar, Sarah (Author) / Fette, Donald (Thesis director) / Zarka, Emily (Committee member) / Department of Management and Entrepreneurship (Contributor) / Department of English (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05