326 research outputs found
Structural transformations and disordering in zirconolite (CaZrTi2O7) at high pressure
No full textThere is interest in identifying novel materials for use in radioactive waste applications and studying their behavior under high pressure conditions. The mineral zirconolite (CaZrTi2O7) exists naturally in trace amounts in diamond-bearing deep-seated metamorphic/igneous environments, and it is also identified as a potential ceramic phase for radionuclide sequestration. However, it has been shown to undergo radiation-induced metamictization resulting in amorphous forms. In this study we probed the high pressure structural properties of this pyrochlore-like structure to study its phase transformations and possible amorphization behavior. Combined synchrotron X-ray diffraction and Raman spectroscopy studies reveal a series of high pressure phase transformations. Starting from the ambient pressure monoclinic structure, an intermediate phase with P21/m symmetry is produced above 15.6 GPa via a first order transformation resulting in a wide coexistence range. Upon compression to above 56 GPa a disordered metastable phase III with a cotunnite-related structure appears that is recoverable to ambient conditions. We examine the similarity between the zirconolite behavior and the structural evolution of analogous pyrochlore systems under pressure.<br/
Racial disparities in prostate cancer - specific mortality in men with low-risk prostate cancer
No full textAbstract not availableBrandon A. Mahal, Ayal A. Aizer, David R. Ziehr, Andrew S. Hyatt, Toni K. Choueiri, Jim C. Hu, Karen E. Hoffman, Christopher J. Sweeney, Clair J. Beard, Anthony V. D'Amico, Neil E. Martin, Simon P. Kim, Quoc-Dien Trinh, Paul L. Nguye
Getting back to equal: the influence of insurance status on racial disparities in the treatment of African American men with high-risk prostate cancer
No full textAbstract not availableBrandon A. Mahal, David R. Ziehr, Ayal A. Aizer, Andrew S. Hyatt, Jesse D. Sammon, Marianne Schmid, Toni K. Choueiri, Jim C. Hu, Christopher J. Sweeney, Clair J. Beard, Anthony V. D, Amico, Neil E. Martin, Christopher Lathan, Simon P. Kim, Quoc-Dien Trinh and Paul L. Nguye
Weight gain on androgen deprivation therapy: which patients are at highest risk?
No full textAbstract not availableDaniel M. Seible, Xiangmei Gu, Andrew S. Hyatt, Clair J. Beard, Toni K. Choueiri, Jason A.Efstathiou, David T.Miyamoto, TimurMitin, Neil E.Martin, Christopher J.Sweeney, Quoc-Dien Trinh, Joshua A. Beckman, Shehzad Basaria, and Paul L. Nguye
Trends in disparate treatment of African American men with localized prostate cancer across national comprehensive cancer network risk groups
No full textAbstract not availableBrandon A. Mahal, Ayal A. Aizer, David R. Ziehr, Andrew S. Hyatt, Jesse D. Sammon, Marianne Schmid, Toni K. Choueiri, Jim C. Hu, Christopher J. Sweeney, Clair J. Beard, Anthony V. D'Amico, Neil E. Martin, Simon P. Kim, Quoc-Dien Trinh, Paul L. Nguye
Birmingham News sleeve BN0014239
No full textEgg shell show at Hyatt / (Carol Rus) / Mrs. C. U. Patrick / [Work order included
Adapting authoritarianism: institutions and co-optation in Egypt and Syria
No full textThis PhD thesis compares Egypt and Syria’s authoritarian political systems. While the tendency in social science political research treats Egypt and Syria as similarly authoritarian, this research emphasizes differences between the two systems with special reference to institutions and co-optation. Rather than reducibly understanding Egypt and Syria as sharing similar histories, institutional arrangements, or ascribing to the oft-repeated convention that “Syria is Egypt but 10 years behind,” this thesis focuses on how events and individual histories shaped each states current institutional strengthens and weaknesses. Specifically, it explains the how varying institutional politicization or de-politicization affects each state’s capabilities for co-opting elite and non-elite individuals.
Beginning with a theoretical framework that considers the limited utility of democratization and transition theoretical approaches, the work underscores the persistence and durability of authoritarianism. Chapter two details the politicized institutional divergence between Egypt and Syria that began in the 1970s. Chapter three and four examines how institutional politicization or de-politicization affects elite and non-elite individual co-optation in Egypt and Syria. Chapter five discusses the study’s general conclusions and theoretical implications.
This thesis’s argument is that Egypt and Syria co-opt elites and non-elites differently because of the varying degrees of institutional politicization in each governance system. Rather than view one country as more politically developed than the other, this work argues that Syria’s political institutions are more politicized than their Egyptian counterparts. Syria’s political arena is, thus, described as politicized-patrimonialism. Syria’s politicized-patrimonial arena produces uneven co-optation of elites and non-elites as they are diffused through competing institutions. Conversely, the Egyptian political arena remains highly personalized as weak institutions and individuals are manipulated and molded according to the president’s ruling clique. This is referred to as personalized-patrimonialism. As a consequence, Egypt’s political establishment demonstrates more flexibility in ad hoc altering and adapting its arena depending on the emergence of crises.
This study’s theoretical implications suggest that, contrary to modernization and democratization theory’s adage that institutions lead to a political development, politicized institutions within a patrimonial order actually hinder regime adaptation because consensus is harder to achieve and maintain. It is within this context that Egypt’s de-politicized institutional framework advantages its top political elite. In this reading of Egyptian and Syrian politics, Egypt’s personalized political arena is more adaptable than Syria’s. These conclusions do not indicate that political reform is a process underway in either state
Stability of Cs-Ionsiv in Portland cement blends for radioactive waste disposal
No full textThe suitability of Portland cement blends for encapsulation of Cs-Ionsiv in a monolithic wasteform was investigated. No evidence of reaction or dissolution of the Cs-Ionsiv in the cementitious environment was found by scanning electron microscopy and X-ray diffraction. However, a small fraction (≤1.6 wt%) of the Cs inventory was released from the encapsulated Ionsiv during leaching experiments carried out on hydrated samples. Cs release was enhanced by exchange of K and Na present in the cementitious pore water. Cement systems lower in K and Na, such as slag based blends, showed lower Cs release than the fly ash based analogues. © 2010 Materials Research Society
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