Quantum interference of electrons in a ring: tuning of the geometrical phase

We calculate the oscillations of the DC conductance across a mesoscopic ring, simultaneously tuned by applied magnetic and electric fields orthogonal to the ring. The oscillations depend on the Aharonov-Bohm flux and of the spin-orbit coupling. They result from mixing of the dynamical phase, including the Zeeman spin splitting, and of geometric phases. By changing the applied fields, the geometric phase contribution to the conductance oscillations can be tuned from the adiabatic (Berry) to the nonadiabatic (Ahronov-Anandan) regime. To model a realistic device, we also include nonzero backscattering at the connection between ring and contacts, and a random phase for electron wavefunction, accounting for dephasing due to disorder.Comment: 4 pages, 3 figures, minor change

Reducing explicit and implicit prejudice toward disabled colleagues: Effects of contact and membership salience in the workplace

In the present study, membership salience was tested as a moderator of the effects of contact on emotions and explicit and implicit attitudes toward the disabled. Participants were non-disabled employees of firms and cooperative societies; they worked in contact with colleagues with psychiatric problems. Results indicated that quantity and quality of contact improved outgroup evaluations, both within and outside the contact situation. Consistent with intergroup contact theory (Brown & Hewstone, 2005), the positive effects of contact on anxiety and empathy toward disabled colleagues generalized to the whole category of the disabled when group distinctions were salient within the contact setting. Notably, frequent and cooperative contact also reduced implicit prejudice toward the general disabled category. Theoretical and practical implications of findings are discussed

Priming attachment security and outgroup humanization: The mediation role of intergroup emotions

Individuals tend to dehumanize the outgroup. In this paper, we explore whether the activation of attachment security can attenuate dehumanization. Two studies were performed. In Study 1, attachment security was primed by showing pictures that depicted relationships with attachment figures; the outgroup was the homeless and humanization was measured considering the attribution of uniquely human and non-uniquely human emotions to this group. In Study 2, the sense of interpersonal security was activated by inviting participants to relive a recent interaction that left them with a feeling of safety and warmth. Outgroup members were the Roma, and humanization was measured considering the attribution of uniquely human and human nature traits to them. In Study 2, the mediation effect of intergroup emotions was investigated. In both studies, outgroup humanization effects were highlighted. In Study 2, these effects were mediated by increased empathy toward the outgroup. Interestingly, the positive impact of security activation was not moderated by chronic attachment orientations. Findings suggest strategies that can be used to improve intergroup relations in specific contexts and in society at large

Appraisal, Agency and Atypicality: Evidence from Manufactured Homes

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73056/1/j.1540-6229.2005.00128.x.pd

Exploring the Impacts of Learning Challenges for Children Not Yet Identified with a Learning Disability

Significant learning challenges can manifest years before children are often eligible to be diagnosed with a Learning Disability (LD). Without a formal diagnosis, many children are often limited in the resources and supports that may receive and critical opportunities for early intervention are missed. This study sought to understand and assess the impact of learning challenges experienced by school-aged children (Grades 1 to 9) who had not yet formally received a diagnosis. Ten parents were recruited from London, Ontario and its surroundings counties (Elgin, Middlesex, Oxford) who were caring for children with significant learning challenges. Data were collected using a combination of quantitative and qualitative methodology. Study participants completed a range of standardized measures to assess the severity of children’s challenges across academic, behavioural, socio-emotional and familial domains. A semi-structured interview was also used to explore parent’s caregiving experiences and perceptions of self-determination. Descriptive data indicated that children and their families were significantly impacted by learning challenges notwithstanding formal diagnostic recognition of their challenges. Qualitative content analysis revealed three overarching themes. These included parent’s knowledge and understanding of children’s learning challenges, prominent caregiving needs and available supports. Parents perceptions supported the concept of self-determination as illustrated by specific behaviors of children in this sample. Results highlight continued areas of improvement in how supports are provided for children with learning challenges across school, community, and professional services

A Chemical Strategy for the Preparation of Multimodified Peptide Imaging Probes

Multimodality probes appear of great interest for innovative imaging applications in disease diagnosis. Herein, we present a chemical strategy enabling site-specific doublemodification and cyclization of a peptide probe exploiting native chemical ligation (NCL) and thiol-maleimide addition. The synthetic strategy is straightforward and of general applicability for the development of double-labeled peptide multimodality probes

Tribology of the lubricant quantized-sliding state

In the framework of Langevin dynamics, we demonstrate clear evidence of the peculiar quantized sliding state, previously found in a simple 1D boundary lubricated model [Phys. Rev. Lett. 97, 056101 (2006)], for a substantially less idealized 2D description of a confined multi-layer solid lubricant under shear. This dynamical state, marked by a nontrivial ``quantized'' ratio of the averaged lubricant center-of-mass velocity to the externally imposed sliding speed, is recovered, and shown to be robust against the effects of thermal fluctuations, quenched disorder in the confining substrates, and over a wide range of loading forces. The lubricant softness, setting the width of the propagating solitonic structures, is found to play a major role in promoting in-registry commensurate regions beneficial to this quantized sliding. By evaluating the force instantaneously exerted on the top plate, we find that this quantized sliding represents a dynamical ``pinned'' state, characterized by significantly low values of the kinetic friction. While the quantized sliding occurs due to solitons being driven gently, the transition to ordinary unpinned sliding regimes can involve lubricant melting due to large shear-induced Joule heating, for example at large speed.Comment: 11 pages, 11 figure