Theses and Dissertations from UMD
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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM
More information is available at Theses and Dissertations at University of Maryland Libraries.
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Item RURAL REDLINING: HOW RILEY ROBERTS ROAD LOST ITS WAY(2021) Kobell, Rona Anne; Nelson, Deborah J; Journalism; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Historians, journalists, and sociologists have documented how 20th century bankers, insurance agents, and city officials discriminated against Black Americans through a system known as redlining. This practice segregated Black residents into certain neighborhoods and reduced the value of their property, making it far more difficult to pass down generational wealth. A similar but less obvious phenomenon occurred in rural areas on Maryland’s Eastern Shore. After the Civil War, Black residents typically found themselves able to buy only the lowest land with the poorest soil. That, too, set up a cascade of events that imperiled Black Marylanders’ ability to pass down generational wealth. This thesis shows how laws, policies, and customs caused an Eastern Shore community to disappear, with a new generation unable to share in its ancestors’ investments. Those factors include the difficulty majority-Black towns had incorporating, which made it harder to receive funds for rebuilding and harder to maintain control of what goes on within their borders; a lack of investment in historic Black properties, in part because state agencies prefer to work with established non-profit historic societies, most of which are white; poor ditch management in lower lands; and an inability to attract state open-space funds to help preserve their lands. For the most part, journalists have not been covering this, because the story is happening slowly and without a major “news hook” to lure in traditional editors. This thesis uses Riley Roberts Road as a case study to examine the broader issue of Black towns, how we’ve lost them, why that history is crucial, and what we can do to make sure we don’t forget the ones that are still with us.Item TYPE I COLLAGEN HOMOTRIMERS; THEIR ROLE IN COLLAGEN FIBRIL FORMATION AND TISSUE REMODELING(2009) Han, Sejin; Losert, Wolfgang; Physics; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Formation and remodeling of type I collagen fibril networks are paradigms of biopolymer self-assembly, yet many of their aspects remain poorly understood. Type I collagen is the most abundant vertebrate protein which self assembles into fibrils and hierarchical fibril network structures, forming scaffolds of bone, skin, tendons and other tissues. The normal isoform of type I collagen is a heterotrimer of two &alpha1(I) and one &alpha2(I) chains, but homotrimers of three &alpha1(I) chains have been reported, e.g., in cancer and fibrosis. Despite their importance in various disorders, very little is known about potential effects of the type I collagen homotrimers on self-assembly, physical properties, and remodeling of collagen fibrils and fibril networks. Thus, we selected characterization of these effects and understanding the underlying physical mechanisms as the topic of the present thesis. Some of our most important findings were: (i) different nucleation mechanism and morphology in homotrimer fibrils compared to the normal heterotrimers fibrils; (ii) segregation of the homo- and heterotrimers within fibrils; (iii) increased bending rigidity of homotrimer fibrils; and (iv) homotrimer resistance to cleavage by enzymes responsible for fibril degradation and remodeling due to increased triple helix stability at the cleavage site. The corresponding in vitro experiments and theoretical analysis of the results suggested drastically different physics of the fibril networks composed of the homo/heterotrimer mixtures and pointed to a potential role of these physics in various disorders, e.g., in cancer and fibrosis pathology.Item Firm Owners and Workers: An Analysis of Immigrants and Ethnic Concentration(2009) Garcia-Perez, Monica I.; Haltiwanger, John; Economics; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)This dissertation consists of three chapters examining the important role of firm and coworker characteristics, as well as the use of social networks, in labor markets. The first paper investigates the effect of firm owners and coworkers on hiring patterns and wages. Immigrant-owned firms are more likely to hire immigrant workers. This prevalence is especially strong for Hispanic and Asian workers. We also find that the probability that a new hire is a Hispanic is higher for immigrant firms. On wage differentials, the results illustrate that much of the difference between the log annual wages of immigrants and natives can be explained by immigrants' propensity to work in non-native owned firms, which pay the lowest average wages. Interestingly, though, native workers holding a job in immigrant firms are paid less than immigrant workers. The last section examines the potential mechanisms for these findings. It explores the importance of job referral and use of networks for migrants in labor markets. We consider the theoretical implications of social ties between owners and workers in this context. Firms decide whether to fill their vacancies by posting their offers or by using their current workers' connections. Next, we explore the patterns of immigrant concentration relative to native workers at the establishment level in a sample of metropolitan areas. Immigrants are much more likely to have immigrant coworkers than are natives, and are particularly likely to work with others from the same country of origin, even within local markets. The concentration of immigrants is higher for recent immigrants and interestingly for older immigrants. We find large differences associated with establishment size that cannot be explained solely by statistical aggregation. Exploring the mechanisms that underlie these patterns, we find that proxies for the role of social networks, as well as the importance of language skills in the production process, are important correlates of immigrant concentration in the workplace.Item Marginalized By Race And Place: Occupational Sex Segregation In Post-Apartheid South Africa(2008-07-29) Parashar, Sangeeta; Presser, Harriet B.; Sociology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Racial and gender disparities found in most other societies are particularly magnified in South Africa where the marginalized social group constitutes a numerical majority of the population. These factors, along with region, are dominant axes of inequality in the country. However, empirical knowledge of the interplay between these systems of social inequality in determining employment outcomes remains somewhat scant. This dissertation addresses that gap by studying occupational sex segregation across various racial groups using multilevel modeling techniques. Individual-level data from the 2001 Census and magisterial-level data from survey data aggregations and published sources are used. I first study the influence of (1) individual (education and migration), (2) household characteristics (family status), and (3) contextual factors (urbanization, former homeland residence, industrial composition, and culture) on women's likelihood of being in white- and blue-collar male-dominated occupations. I then investigate whether the effects of these individual and contextual characteristics on occupational placement vary across the four main racial groups (i.e., black African, Coloureds, Asian-Indians, and Whites)? That is, do these factors interact differently for different racial groups? Results from the analyses indicate that high concentrations of service industries tend increased women's opportunities for holding white-collar male-dominated occupations. On the other hand, while black African women's placement in male-dominated jobs is not influenced by urbanization, women of other races, particularly Coloureds and Whites, fare better in urban districts. In fact, residence in and around homelands was particularly significant for black Africans who are still trying to gain a foothold in mainstream South African society. In the unique case of Indian women, labor supply factors such as education, have greater predictive power than macro-level demand factors. In terms of human supply variables, educational attainment improves women's chances of holding male-dominated occupations among white collar workers across all racial groups; the effect is not as strong among blue-collar workers. However, returns to education are not as high as expected. Migration is significant for only black Africans, highlighting the legacy of apartheid. Finally, women's marital status and associated short-term child bearing obligations do not act as impediments to their occupational choices.Item Understanding Modern Segregation: Suburbanization and the Black Middle Class(2008-06-12) Harrell, Rodney; Baum, Howell; Urban and Regional Planning and Design; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)A new sociological phenomenon exists: middle class African Americans are moving to suburban areas and many are moving to majority black neighborhoods and developing majority black communities. This challenges common thinking among social scientists and policymakers who make broad assumptions that concentrations of African Americans are inherently problematic. This project distinguishes the involuntary segregation and concentration of the black poor from those who choose to live in racially concentrated communities. Those in the middle class who choose to live in majority black neighborhoods may do so for several reasons, including social institutions, political incorporation, ethnically responsive commercial development, and their individual preferences for integration. It focuses on majority-black Prince George's County, Maryland, a prominent example of this phenomenon, and compares those homeowners there with those in predominately white neighborhoods in neighboring Montgomery County. The research hypothesizes that those who choose predominately black neighborhoods do so because these neighborhoods give them access to cultural or physical amenities associated with African American culture and the comfort of living with other African Americans, and also that those who live in predominately black neighborhoods differ from those that live in predominately white neighborhoods in their preferences for those amenities specific to a majority African American neighborhood and those amenities that often exist in majority white neighborhoods. These questions are addressed through several methods: the analysis of national housing data to describe the extent of African American middle class suburbanization, site visits and historical analysis of both counties, and semi-structured interviews of middle-class African American residents to provide reasons why they live in the neighborhoods that they have chosen. The study includes 50 respondents: 38 in Prince George's and 12 in Montgomery. The findings that some prefer African American neighborhoods have several potential policy implications, including a shift in housing policy from a focus on racial integration to one of economic integration and community development. More specifically, it argues for a particular focus on education reform, economic development and the promotion of responsible commercial development in predominately black neighborhoods, and it points toward considering the benefit of racial/cultural amenities in existing poverty deconcentration efforts.