Scaling of Coulomb pseudo-potential in s-wave narrow-band superconductors

The Coulomb pseudo-potential $\mu^*$ is extracted by fitting the numerically calculated transition temperature $T_c$ of the Eliashberg-Nambu equation which is extended to incorporate the narrow-band effects, that is, the vertex correction and the frequency dependence of the screened Coulomb interaction. It is shown that even for narrow-band superconductors, where the fermi energy $\epsilon_F$ is comparable with the phonon frequency $\omega_{ph}$, the Coulomb pseudo-potential is a pertinent parameter, and is still given by $\mu^* = \mu/[1+\mu \ln(\epsilon_F/\omega_{ph})]$, provided $\omega_{ph}$ is appropriately scaled.Comment: 5 pages, 3 figures, accepted for publication by Phys. Rev.

Automating Reuse for Systems Design

Reuse is as an important approach to conceptual object-oriented design. A number of reusable artifacts and methodologies to use these artifacts have been developed that require the designer to select to a certain level of granularity and a certain paradigm. This makes retrieval and application of these artifacts difficult and prevents the simultaneous reuse of artifacts at different levels of granularity. The purpose of this research, therefore, is to develop an actionable approach to lowering barriers to reuse. The approach is materialized in automating the conceptual design stage of the systems development process by reusing a new kind of design artifacts, which we call design fragments, which are synthesized with analysis patterns. The goal of the study includes the development of machine learning algorithms generating reusable design fragments and effectively storing/retrieving them

Determinants of Organic Cotton Apparel Purchase: A Comparison of Young Consumers in the USA and South Korea

The purpose of this research was to examine consumers from distinct cultural groups and identify similarities and differences in their green purchase behaviors. The sample consisted of consumers from the U.S.A. and South Korea and the theory of planned behavior was used as a theoretical framework to test the influence of diverse constructs on consumers\u27 purchase intentions toward organic cotton apparel. For both countries, perceived behavioral control (PBC) and descriptive norms were strong predictors of purchase intentions and injunctive norms strongly influenced attitude formation. However, the study also found different results between the two groups. For example, while attitude was the strongest predictor of purchase intentions in the U.S.A. group (strength of influence on intentions: attitude \u3e descriptive norms \u3e PBC \u3e injunctive norms), it had an insignificant effect in the South Korea group. For the South Korea group descriptive norms and PBC had strongest effects on consumers purchase intentions (strength of influence on intentions: descriptive norms = PBC \u3e injunctive norms \u3e attitude). South Koreans were more affected by the social pressure: their purchase intentions were strongly influenced by both injunctive norms and descriptive norms in contrast to the findings from American consumers. Injunctive norms were an insignificant predictor of purchase intentions in the U.S.A. group. This result is consistent with previous research that suggest conformity is a crucial factor for people belonging to a collectivistic culture. Exposure of others\u27 purchasing behavior is particularly important in motivating consumers\u27 buying in collectivistic culture. Marketers of organic cotton apparel may consider using diverse formats of media to display consumers\u27 ethical buying behaviors or creating product design or packaging that can directly reveal the ethical features of the product to display greater exposure in the market

Dynamical mean-field theory of Hubbard-Holstein model at half-filling: Zero temperature metal-insulator and insulator-insulator transitions

We study the Hubbard-Holstein model, which includes both the electron-electron and electron-phonon interactions characterized by $U$ and $g$, respectively, employing the dynamical mean-field theory combined with Wilson's numerical renormalization group technique. A zero temperature phase diagram of metal-insulator and insulator-insulator transitions at half-filling is mapped out which exhibits the interplay between $U$ and $g$. As $U$ ($g$) is increased, a metal to Mott-Hubbard insulator (bipolaron insulator) transition occurs, and the two insulating states are distinct and can not be adiabatically connected. The nature of and transitions between the three states are discussed.Comment: 5 pages, 4 figures. Submitted to Physical Review Letter

The Role of Brand Love: Application of the Hierarchy of Effects Model

Understanding the attributes that build consumer loyalty is particularly critical to fashion companies due to the prevalence of alternatives in the market with low switching costs. The significance of this study is extending the knowledge on the role of brand love using the hierarchy of effects model in the context of fashion consumer behaviors. A questionnaire in which participants provided self-reported responses was created to measure the constructs. A two-step approach, a measurement and a structural model was used for the statistical analysis. The results indicated that consumers who know more about the fashion brands are more likely to have stronger emotional attachment to their favorite fashion brand and brand love, in turn, has a significant effect on performing brand loyal behaviors. In addition, the findings suggested that consumers perceive greater brand love when the brand has similar image to their actual and ideal self-images

Explaining socially responsible consumer behavior: A meta‐analytic review of theory of planned behavior

Despite retailer and consumer interest in ethical consumerism, prior research provides limited knowledge about purchase behaviors of socially responsible consumers. The term, socially responsible consumer has been conceptualized rather broadly and its definition varies across studies. The discrepancy in the use of the term and mixed results in previous research accordingly provide narrow understanding on this topic