The Hierarchy of Excitation Lifetimes in Two-Dimensional Fermi Gases

Momentum-conserving quasiparticle collisions in two-dimensional Fermi gases give rise to a large family of exceptionally long-lived excitation modes. The lifetimes of these modes exceed by a factor $(T_F/T)^2\gg 1$ the conventional Landau Fermi-liquid lifetimes $\tau\sim T_F/T^2$. The long-lived modes have a distinct angular structure, taking the form of $\cos m\theta$ and $\sin m\theta$ with odd $m$ values for a circular Fermi surface, with relaxation rate dependence on $m$ of the form $m^4\log m$, valid at not-too-large $m$. In contrast, the even-$m$ harmonics feature conventional lifetimes with a weak $m$ dependence. The long-time dynamics, governed by the long-lived modes, takes the form of angular (super)diffusion over the Fermi surface. Altogether, this leads to unusual long-time memory effects, defining an intriguing transport regime that lies between the conventional ballistic and hydrodynamic regimes.Comment: 29 pgs, 6 fg

Vive la différence? Women and trade unions in Britain

Dans tous les domaines, et particulièrement dans celui de l’engagement syndical, les femmes sont à la fois semblables à, et différentes des hommes. Dans une analyse en termes de lutte des classes, les femmes comme les hommes sont opprimés par le capital sous différentes formes et espèrent s’unir contre cette oppression. Cependant, selon une analyse en termes de rapport patriarcal, les femmes sont opprimées par les hommes quelle que soit leur place dans la structure sociale. Cette différence fondamentale ouvre des perspectives intéressantes et sous-tend le débat engagé ici sur les femmes et la politique du genre au sein des syndicats britanniques. Cet article vise à étudier les tensions et les paradoxes concernant le rôle des femmes dans les syndicats et à montrer comment les pratiques discriminatoires à l’encontre des femmes sur le lieu de travail et dans le mouvement syndical ont influencé le syndicalisme britannique depuis la révolution industrielle.In all respects, and especially in the field being discussed in this issue on British trade unions, women are both similar to, and different from men. In a class analysis working women and men are each oppressed by capital in its various forms, with the expectation that they will both collectivise against this oppression. However in a patriarchal analysis women are oppressed by men wherever they sit in the class structure. This fundamental difference leads in interesting directions, and informs the discussion in this article about women and gender politics in British trade unions. This article aims to explore the tensions and paradoxes about the role of women in trade unions, discuss how exclusionary practices against women in the workplace and in trade unions have shaped their trade unionism over the 200 years since industrialisation in Britain

Beginnings and Endings: An Inquiry into the Attachment Orientations and Termination Approaches among Clinical Social Workers

All therapeutic relationships must come to an end. Although there is ample social work literature on the impact of termination on clients, there is a dearth of scholarship on the experiences of clinicians during this phase. This study explored the links between the levels of attachment orientation of a purposive sample (N=49) of clinical social workers and their subjective approaches to termination. The Adult Attachment Questionnaire (AAQ) and the Termination Approaches Questionnaire (TAQ) (created for this study) were instruments used in this online survey design. The results suggested a statistically significant relationship between attachment orientation of clinical social workers and their approaches to termination. Participants with lower scores on the AAQ had higher scores on the engagement subscale of the TAQ indicating that those with higher attachment security were more likely engaging in the process of termination. Likewise, results suggested that the higher the AAQ scores the higher the scores on the avoidance subscale of the TAQ indicating that those with less secure attachment orientation were more likely avoiding the termination process. Qualitative results highlighted the emotional ambivalence, the opportunities, and the need for education about the termination phase. The worker’s role and the therapeutic relationship emerged as key factors in termination approaches. By bringing increased attention to termination and to clinician attachment in this phase of the work, this study strengthens the potential of clinical social workers engaged in outpatient psychotherapy practice to minimize unfavorable effects of termination on clients and on themselves

Application of Absorbing Markov Chains to the Assessment of Education Attainment Rates within Air Force Materiel Command Civilian Personnel

Increasing the education levels of an organization is a common response when attempting to improve organizational performance; however, organizational performance improvements are seldom found when the current and future workforce education levels are unknown. In this research, absorbing Markov chains are used to probabilistically forecast the educational composition of the Air Force Materiel Command civilian workforce to enable organizational performance improvements. Through the purposeful decoupling of effects resulting from recent workforce arrivals and education level progressions, this research attempts to determine the implications that stationarity assumptions have throughout the model development process of an absorbing Markov chain. The results of the analysis indicate that the four combinations of stationarity assumptions perform similarly at representing the historical data and that the forecasted educational attainment rates of the Air Force Materiel Command civilian workforce are expected to increase significantly

An Examination of Social Connectedness on PTSD and Freezing in a Student Military Population

This study investigates the impact of social connectedness (SC) and post-traumatic stress disorder (PTSD) in a military college population, and their relation to physiological measures such as body sway, heart rate (HR), and heat rate variability (HRV). According to previous research, people with PTSD are more likely to exhibit a freezing response to affective images. In the present study, we explore the potential freezing response for military personnel at the levels of PTSD symptom groups and social connectedness. We also investigate the possible buffering effect social connectedness has on the outcome of PTSD and freezing. There was a total of 38 participants with ages ranging from 19-49 (M = 31.87) and a slight majority of males (52.6%). The study was administered in a lab at the University of North Florida, in which participants were administered the following measures: The Social Connectedness Scale - Revised (Lee, Draper, & Lee, 2001), the PTSD checklist for the DSM-5 (PCL-5; Weathers et al., 2013), and the Brief Trauma questionnaire (Schnurr, Vielhauer, Weathers, & Findler, 1999). The participants also took part in a measure of mobility using the Matscan pressure mat (Tekscan Inc.), while their HR/HRV (eMotion Faros) was recorded as they watched affective (pleasant, neutral, and unpleasant) images. There was a pattern of reduced sway for military personnel regardless of PTSD symptom group or social connectedness; however, there were no significant differences in heart rate, heart rate variability, or mobility across the conditions. Analyses revealed a significantly lower PTSD symptoms scores for participants with higher levels of social connectedness. This finding is especially important as it indicates the essential role social connectedness plays in well-being. Social connection may further provide insight into intervention and treatment options for PTSD

A Multidisciplinary Approach to Creating the Entrepreneurial Mindset Amongst Graduates

The aim of this paper is to investigate how one third level college in Ireland has responded to economic change with the development of a multi-disciplinary entrepreneurship programme and to explore its impact on the development of entrepreneurial mind-sets amongst its current students and graduates. The findings are based on results of surveys from twenty graduates from the programme who have come from a cross section of engineering and science disciplines. Findings of this study indicate that a dedicated entrepreneurship programme specifically designed for non-business students has had an overwhelming positive impact on their entrepreneurial attitudes and intentions. In particular, students‟ understanding of entrepreneurship has been significantly changed since completing the programme, their level of confidence towards starting a business has increased and collectively the group have embraced the culture of entrepreneurship. This paper can provide useful information to academics in developing third level entrepreneurship programmes for non-business disciplines. The study is an innovative example of entrepreneurship education and creates a framework for other third level institutions to develop similar initiatives to help lay the foundations for entrepreneurship to be the norm, and as such will also be of interest to researchers in this space