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- Genre: Masters Thesis
- Creators: Arizona State University
- Creators: Chakraborty, Bijeta
- Member of: ASU Electronic Theses and Dissertations
Description
Mixed-income housing policy has been an approach to address the problem of concentrated poverty since the 1990s. The idea of income mix in housing is founded on the proposition that economic opportunities of the poor can be expanded through the increasing of their social capital. The current in-depth case study of Vineyard Estates, a mixed-income housing development in Phoenix, AZ tests a hypothesis that low-income people improve their chances of upward social mobility by building ties with more affluent residents within the development. This study combines qualitative and quantitative methods to collect and analyze information including analysis of demographic data, resident survey and in-depth semi-structured interviews with residents, as well as direct observations. It focuses on examining the role of social networks established within the housing development in generating positive economic outcomes of the poor. It also analyzes the role of factors influencing interactions across income groups and barriers to upward social mobility. Study findings do not support that living in mixed-income housing facilitates residents' upward social mobility. The study concludes that chances of upward social mobility are restrained by structural factors and indicates a need to rethink the effectiveness of mixed-income housing as an approach for alleviating poverty.
ContributorsDurova, Aleksandra (Author) / Kamel, Nabil (Committee member) / Pfeiffer, Deirdre (Committee member) / Lucio, Joanna (Committee member) / Arizona State University (Publisher)
Created2013
Description
Efficiency of components is an ever increasing area of importance to portable applications, where a finite battery means finite operating time. Higher efficiency devices need to be designed that don't compromise on the performance that the consumer has come to expect. Class D amplifiers deliver on the goal of increased efficiency, but at the cost of distortion. Class AB amplifiers have low efficiency, but high linearity. By modulating the supply voltage of a Class AB amplifier to make a Class H amplifier, the efficiency can increase while still maintaining the Class AB level of linearity. A 92dB Power Supply Rejection Ratio (PSRR) Class AB amplifier and a Class H amplifier were designed in a 0.24um process for portable audio applications. Using a multiphase buck converter increased the efficiency of the Class H amplifier while still maintaining a fast response time to respond to audio frequencies. The Class H amplifier had an efficiency above the Class AB amplifier by 5-7% from 5-30mW of output power without affecting the total harmonic distortion (THD) at the design specifications. The Class H amplifier design met all design specifications and showed performance comparable to the designed Class AB amplifier across 1kHz-20kHz and 0.01mW-30mW. The Class H design was able to output 30mW into 16Ohms without any increase in THD. This design shows that Class H amplifiers merit more research into their potential for increasing efficiency of audio amplifiers and that even simple designs can give significant increases in efficiency without compromising linearity.
ContributorsPeterson, Cory (Author) / Bakkaloglu, Bertan (Thesis advisor) / Barnaby, Hugh (Committee member) / Kiaei, Sayfe (Committee member) / Arizona State University (Publisher)
Created2013
Description
Class D Amplifiers are widely used in portable systems such as mobile phones to achieve high efficiency. The demands of portable electronics for low power consumption to extend battery life and reduce heat dissipation mandate efficient, high-performance audio amplifiers. The high efficiency of Class D amplifiers (CDAs) makes them particularly attractive for portable applications. The Digital class D amplifier is an interesting solution to increase the efficiency of embedded systems. However, this solution is not good enough in terms of PWM stage linearity and power supply rejection. An efficient control is needed to correct the error sources in order to get a high fidelity sound quality in the whole audio range of frequencies. A fundamental analysis on various error sources due to non idealities in the power stage have been discussed here with key focus on Power supply perturbations driving the Power stage of a Class D Audio Amplifier. Two types of closed loop Digital Class D architecture for PSRR improvement have been proposed and modeled. Double sided uniform sampling modulation has been used. One of the architecture uses feedback around the power stage and the second architecture uses feedback into digital domain. Simulation & experimental results confirm that the closed loop PSRR & PS-IMD improve by around 30-40 dB and 25 dB respectively.
ContributorsChakraborty, Bijeta (Author) / Bakkaloglu, Bertan (Thesis advisor) / Garrity, Douglas (Committee member) / Ozev, Sule (Committee member) / Arizona State University (Publisher)
Created2012
Description
Through critical discourse analysis, this thesis explores the construction of poverty and development within and across the United Nations Millennium Development Goals and the proposed post-2015 Sustainable Development Goals texts. The proposed post-2015 Sustainable Development Goals frame the international development landscape for the next 15 years, therefore it becomes imperative for civil society to understand their dominant economic schemes for poverty alleviation in order to adopt or oppose similar methods of poverty abatement. Deductively, this thesis investigates Keynesianism and neoliberalism, the dominant economic discourses whose deployments within the goals have shaped transnational frameworks for interpreting and mitigating poverty. It assesses the failures of the Millennium Development Goals, as articulated both by its creators and critics, and evaluates the responsiveness of the United Nations in the constitution of the proposed post-2015 Sustainable Development Goals in relation to these critiques through the lens of liberal feminist and World Social Forum discourses. These activist and oppositional social discourses embody competing values, representations, and problem-solution frames that challenge and resist the dominant economic discourses in both sets of goals. Additionally, this thesis uses an inductive approach to critically analyze both sets of goals in order to identify any emergent discursive frameworks grounded in each text that assist in understanding the problems of, and solutions to, poverty.
ContributorsBriant, Janie (Author) / Nadesan, Majia (Thesis advisor) / Kelley, Douglas L. (Committee member) / Keahey, Jennifer (Committee member) / Arizona State University (Publisher)
Created2015
Description
In this thesis, a digital input class D audio amplifier system which has the ability
to reject the power supply noise and nonlinearly of the output stage is presented. The main digital class D feed-forward path is using the fully-digital sigma-delta PWM open loop topology. Feedback loop is used to suppress the power supply noise and harmonic distortions. The design is using global foundry 0.18um technology.
Based on simulation, the power supply rejection at 200Hz is about -49dB with
81dB dynamic range and -70dB THD+N. The full scale output power can reach as high as 27mW and still keep minimum -68dB THD+N. The system efficiency at full scale is about 82%.
to reject the power supply noise and nonlinearly of the output stage is presented. The main digital class D feed-forward path is using the fully-digital sigma-delta PWM open loop topology. Feedback loop is used to suppress the power supply noise and harmonic distortions. The design is using global foundry 0.18um technology.
Based on simulation, the power supply rejection at 200Hz is about -49dB with
81dB dynamic range and -70dB THD+N. The full scale output power can reach as high as 27mW and still keep minimum -68dB THD+N. The system efficiency at full scale is about 82%.
ContributorsBai, Jing (Author) / Bakkaloglu, Bertan (Thesis advisor) / Arizona State University (Publisher)
Created2015
Description
In what has been coined the postfeminist era, successes of the second wave feminist movement have been distorted by sociopolitical and economic structures to proclaim that sexism and inequality no longer exist within liberal American society, and thus feminism as a movement is no longer necessary. While theoretical and quantitative work has examined women’s relationship with feminist identity, limited research exists on women’s subjective, qualitative accounts of feminist identity. Furthermore, there is a dearth of research on women’s subjective identification across the spectrum of feminist identity, particularly from non-college and non-white populations. Using thematic analysis this study critically analyzed 20 qualitative interviews from a community sample of women in a large Southwest city (Age range: 18-52; Mean age: 35.35, SD: 12.0). Narratives revealed four themes surrounding women’s identification with feminism and conceptions of sexuality: 1) Feminist self-labeling associated with a collective identity 2) Empowerment as a personal endeavor 3) Female empowerment and relationships with men and 4) Investments in femininity and sexual empowerment. This data supports the notion that feminist ideals of equality and agency have been distorted by postfeminist and neoliberal ideology to prevent women from identifying as feminists. Additionally, data postulate that this distortion has permeated ideologies of feminist women, thereby discouraging collective action for change.
ContributorsCarlyle, Madison S (Author) / Fahs, Breanne (Thesis advisor) / Swank, Eric (Committee member) / Przybylo, Ela (Committee member) / Arizona State University (Publisher)
Created2017
Description
ABSTRACT This thesis analyzes the discourse surrounding proposed solutions to the immigration phenomenon in the United States. I conducted two qualitative media analyses on the rhetoric and conceptual frames found in mass media newscasts reporting on the immigration debate. The first analysis covered the general immigration debate and the second covered the appearance of American southwest ranchers. Specifically the analyses contrasted the media's coverage of root economic causes to the immigration phenomenon in comparison to reactionary solutions as proposed by leading immigrant attrition organizations such as the immigration think tank, Federation for American Immigration Reform (FAIR) and Republican linguist, Frank Luntz. The main argument of this thesis is based on an analysis of how the media has used southwestern ranchers as expert witnesses for reactionary solutions on a national level. An acute qualitative media analysis was used to compare the rhetoric found in the media coverage of southwestern ranchers versus the rhetoric found in 12 in-depth interviews I conducted with ranchers in the American southwest. This thesis contends that the media has successfully turned southwestern ranchers into spokespersons for border security rhetoric, furthering the binary debates on border security and immigration reform and thus obscuring the conditions which force migrants to leave their home countries. The grounding theoretical framework for this thesis is based on David Altheide's qualitative media analysis which identifies how certain frames and common narratives ultimately construct a way of discussing the problem or the kind of discourse that will follow. This was structured on Atheide's qualitative media analysis protocols to dissect mass media newscasts covering the immigration debate and more specifically the mass media's coverage of southwestern ranchers. The qualitative media analyses were employed to determine whether the discourse found in nightly newscasts falls in line with root causes of immigration or FAIR's concern with reactionary solutions. To further assess the media's ability to shape discourse, and ultimately policy, these qualitative analyses were compared with in-depth interviews of the ranchers.
ContributorsFuente, Nicolás Antonio de la (Author) / Téllez, Michelle (Thesis advisor) / Stancliff, Michael (Committee member) / Gomez, Alan (Committee member) / Arizona State University (Publisher)
Created2010
Description
The purpose of this study is to examine the influence of neoliberalism on the occurrence and intervention of genocide, particularly the ability to create othered groups through a process of dehumanization that desensitizes those in power to the human condition. I propose Social Externalization Theory as paradigm that explains how neoliberalism can be used as a means social control to create subjects vulnerable to political and collective violence that is justified as the externalized cost of economic growth, development, and national security. Finally, the conflict in Darfur (2003 - 2010) serves as a case study to analyze the influence of neoliberal policies on the resistance of the International community to recognize the violence as genocide. Analysis of the case study found that some tenets of neoliberalism produce results that fit within the ideologies of genocide and that some aspects of neoliberalism assume a genocidal mentality. In this case, those in positions power engage in daily activities that justify some suffering as acceptable, thus desensitizing them to the harm that their decisions generate.
ContributorsCalleja, Robert J (Author) / Romero, Mary (Thesis advisor) / Swadener, Beth Blue (Committee member) / Schugurensky, Daniel, 1958- (Committee member) / Arizona State University (Publisher)
Created2013