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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Electronic and Geometrical Structure of Phthalocyanines on Surfaces : An Electron Spectroscopy and Scanning Tunneling Microscopy StudyÅhlund, John January 2007 (has links)
Core- and Valence Photoelectron Spectroscopy (PES), X-ray- and Ultraviolet-Visible Absorption Spectroscopy (XAS and UV-Vis), Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT) calculations are used to study the electronic and geometrical structure of a class of macro-cyclic molecules, Phthalocyanines (Pc), on surfaces. These molecules are widely studied due to their application in many different fields. Multilayer and monolayer coverages of Iron Phthalocyanine (FePc) and metal-free Phthalocyanine (H2Pc) deposited on different surfaces are investigated in order to get insight in the electronic and geometrical structure of the obtained overlayers, of crucial importance for the understanding of the film functionality. Sublimation of molecular thick films on Si(100) and on conducting glass results in films with molecules mainly oriented with their molecular plane orthogonal to the surface. Ex-situ deposited H2Pc films on conductive glass show different molecular orientation and morphology with respect to the vacuum sublimated films. We study the monolayer adsorption structure of FePc and H2Pc and compare our results with other Pc’s adsorbed on graphite. We find that the molecular unit cell and the superstructure is characteristic for each Pc adsorbed on graphite, even if the geometrical size of the compared molecules is the same. The PE- and XA- spectra of FePc on graphite are essentially identical for the mono- and multilayer preparations, evidencing weak intermolecular and molecular-substrate interactions of van der Waals nature. Furthermore, we characterize Pc’s on InSb (001)-c(8x2). The substrate In rows are observed to be the adsorption site for Pc’s. We find that the growth of the two-dimensional islands of FePc is prolonged in the [-110] direction, in contrast to ZnPc adsorbed on the same substrate at room temperature. We interpret this result as an indication that the adsorption is controlled by the substrate corrugation observed at 70 K.
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Unity, Justice and Protection: The Colored Trainmen of America's Struggle to End Jim Crow in the American Railroad Industry [and Elsewhere]James, Ervin 2012 August 1900 (has links)
The Colored Trainmen of America (CTA) actively challenged Jim Crow policies on the job and in the public sphere between the 1930s and 1950s. In response to lingering questions concerning the relationship between early black labor activism and civil rights protest, this study goes beyond both local lure and cursory research. This study examines the Colored Trainmen's major contributions to the advancement of African Americans. It also provides context for some of the organization's shortcomings in both realms. On the job the African American railroad workers belonging to the CTA fought valiantly to receive the same opportunities for professional growth and development as whites working in the operating trades of the railroad industry. In the public sphere, these men collectively protested second-class services and accommodations both on and off the clock.
Neither their agenda, the scope of their activities, nor their influence was limited to the railroad lines the members of the CTA operated within the Gulf Coast region. The CTA belonged to a progressive coalition comprised of four other powerful independent African American labor unions committed to unyielding labor activism and the toppling of Jim Crow. Together, they all worked to effectuate meaningful social change in partnership with national civil rights attorney Charles H. Houston. Houston's experience and direction, coupled with the CTA's dedicated membership and willingness to challenge authority, created considerable momentum in movements aimed at toppling racial inequality in the workplace and elsewhere.
Like most of their predecessors, the CTA's struggle for advancement fits within a continuum of successive challenges to economic exploitation and racial inequality. No single person or organization can take full credit for ending segregation or achieving equality. Many who remain nameless and faceless contributed and sacrificed. This study not only chronicles the contribution of a relatively unsung African American labor organization that waged war against Jim Crow on two different fronts, it also pays homage to a few more individuals who made a difference in the lives of an entire race of people during the course of a bitterly contested, never-ending struggle for racial equality in the United States of America during the twentieth century.
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