Counterions at Charged Cylinders: Criticality and universality beyond mean-field

The counterion-condensation transition at charged cylinders is studied using Monte-Carlo simulation methods. Employing logarithmically rescaled radial coordinates, large system sizes are tractable and the critical behavior is determined by a combined finite-size and finite-ion-number analysis. Critical counterion localization exponents are introduced and found to be in accord with mean-field theory both in 2 and 3 dimensions. In 3D the heat capacity shows a universal jump at the transition, while in 2D, it consists of discrete peaks where single counterions successively condense.Comment: 4 pages, 3 figures; submitted to Phys. Rev. Lett. (2005

Onsager-Manning-Oosawa condensation phenomenon and the effect of salt

Making use of results pertaining to Painleve III type equations, we revisit the celebrated Onsager-Manning-Oosawa condensation phenomenon for charged stiff linear polymers, in the mean-field approximation with salt. We obtain analytically the associated critical line charge density, and show that it is severely affected by finite salt effects, whereas previous results focused on the no salt limit. In addition, we obtain explicit expressions for the condensate thickness and the electric potential. The case of asymmetric electrolytes is also briefly addressed.Comment: to appear in Phys. Rev. Let

Capillary zone electrophoretic studies of ion association between inorganic anions and tetraalkylammonium ions in aqueous-dioxane media

Ion association between inorganic anions and symmetrical tetraalkylammonium ions, R4N+ (R = Me, Et, Pr, n-Bu, n-Am, and 2-methyl butyl {isoamyl = iAm}) was investigated using ordinary silica capillary by capillary zone electrophoresis. An improved version of the Williams-Vigh method was used for the first time to measure the mobilities of the inorganic anions. Plots of log K-ass against log dielectric constant in various media, revealed a smaller change in K-ass compared to dielectric constant. These plots suggest that the Bjerrum's equation is inadequate in accounting for the associations of ions in a CZE setup. </p

Bisexuality And Identity Formation

This study explores the identity development and psychological adjustment of bisexual individuals (n = 138) as compared to homosexual (n = 45) and heterosexual participants (n = 558). Undergraduate students recruited from psychology classes at a large metropolitan university in Florida (67% female, 65% Caucasian) took an online survey for course extra credit. Bisexual and homosexual participants scored higher in identity exploration than the heterosexual participants. Bisexual participants scored significantly higher in psychological symptom severity than heterosexual participants. The three groups were not significantly different in identity commitment nor in identity distress. Female bisexual participants scored more similar to the homosexual participants in identity exploration, while the male bisexual participants were more similar to the heterosexual participants. Among males, bisexual and homosexual participants reported greater psychological symptom severity than heterosexual participants. There were no differences between groups for female participants in regard to symptom severity. This study highlights the need for more research into the psychological correlates of bisexuality as a distinct group from homosexuality, as well as the need to focus on gender as a significant moderator of these relationships

Performance and Organized Labor in Depression America: Community and Contestation. (Volumes I and II).

This study investigates the relationship among cultural performance, community, and contestation in two depression-era, organized labor social dramas. The major arguments developed in the study are summarized in the following three contentions. First, performances are inherently contestatory. Second, contestation and community stand in an interdependent rather than oppositional relationship to one another. Third, a dialectical relationship exists between performance and community whereby communities not only produce but are produced by performances. Chapter one defines key concepts and offers a rationale for the study. Two rationales for exploring the relationship among cultural performances, contestation, and community are advanced. First, despite the increasingly political view of performance adopted by scholars during the past two decades, most performance studies scholarship nevertheless has stopped short of advancing a view of performance as inherently contestatory. Second, while new historicists have popularized the performance-culture dialectic, they have not provided an accompanying framework for describing how performances instantiate contestation and negotiate community. Chapter two advances an agonistic framework for analyzing performance. To analyze how cultural performances instantiate contestation, the agonistic framework directs attention to three interrelated realms: the direction of effectivity (whether the performance maintains or subverts status quo relations of power), the mode of effectivity (the strategies through which the directional movement is transacted), and the spheres of contestation (the levels at which the strategies are operationalized, whether textual, spatial, or conceptual). To analyze how performances negotiate community, the agonistic framework directs attention to two interrelated realms: inscribed community (the representations of community inscribed in performances) and enacted community (the relationship among performers, among audience members, and between performers and audience members). Chapters three and four use the analytical framework proposed in chapter two. Chapter three uses the agonistic framework to investigate the Workers Alliance of America\u27s 1936 seizure of the New Jersey State Assembly. Chapter four uses the agonistic framework to investigate the 1936-1937 Flint, Michigan, autoworkers\u27 sitdown strike. Chapter five articulates conclusions and suggests directions for future research