Surface Energy in Cold Asymmetrical Fermion Superfluids

We derive the energy of the surface between the normal and superfluid components of a mixed phase of a system composed of two particle species with different densities. The surface energy is obtained by the integration of the free energy density in the interface between the two phases. We show that the mixed phase remains as the favored ground state over the gapless phase in weak coupling. We find that the surface energy effects emerge only at strong coupling.Comment: 12 pages, 2 figures, typos corrected, published versio

Ultimate periodicity of b-recognisable sets : a quasilinear procedure

It is decidable if a set of numbers, whose representation in a base b is a regular language, is ultimately periodic. This was established by Honkala in 1986. We give here a structural description of minimal automata that accept an ultimately periodic set of numbers. We then show that it can verified in linear time if a given minimal automaton meets this description. This thus yields a O(n log(n)) procedure for deciding whether a general deterministic automaton accepts an ultimately periodic set of numbers.Comment: presented at DLT 201

Soft gluon radiation and energy dependence of total hadronic cross-sections

An impact parameter representation for soft gluon radiation is applied to obtain both the initial decrease of the total cross-section ($\sigma_{tot}$) for proton-proton collisions as well as the later rise of $\sigma_{tot}$ with energy for both $pp$ and $p\bar{p}$. The non-perturbative soft part of the eikonal includes only limited low energy gluon emission and leads to the initial decrease in the proton-proton cross- section. On the other hand, the rapid rise in the hard, perturbative jet part of the eikonal is tamed into the experimentally observed mild increase by soft gluon radiation whose maximum energy rises slowly with energy.Comment: 30 pages, 6 figures. Version accepted for publication in Physical Review D. Additional section with explanatory material added making the paper more self contained and two figures changed to have a complete summary of the available accelerator dat

Skin effect with arbitrary specularity in Maxwellian plasma

The problem of skin effect with arbitrary specularity in maxwellian plasma with specular--diffuse boundary conditions is solved. A new analytical method is developed that makes it possible to to obtain a solution up to an arbitrary degree of accuracy. The method is based on the idea of symmetric continuation not only the electric field, but also electron distribution function. The solution is obtained in a form of von Neumann series.Comment: 7 pages, 2 figure

Surface effects in magnetic superconductors with a spiral magnetic structure

We consider a magnetic superconductor MS with a spiral magnetic structure. On the basis of generalized Eilenberger and Usadel equations we show that near the boundary of the MS with an insulator or vacuum the condensate (Gor'kov's) Green's functions are disturbed by boundary conditions and differ essentially from their values in the bulk. Corrections to the bulk quasiclassical Green's functions oscillate with the period of the magnetic spiral, $2\pi /Q$, and decay inside the superconductor over a length of the order $v/\pi T$ (ballistic limit) or $\sqrt{D/\pi T}$ (diffusive limit). We calculate the dc Josephson current in an MS/I/MS tunnel junction and show that the critical Josephson current differs substantially from that obtained with the help of the tunnel Hamiltonian method and bulk Green's functions.Comment: 10 pages 3 Figs; some misprints in fromulae corrected; submitted to Phys. Rev.

Ayudando a otros a usar los medios sociales:: Estereotipos de edad al estimar el éxito del alumno

Social networking sites (SNS) include online products such as Facebook that allow users to build and maintain large interpersonal Inter net networks. Older adult users have dramatically increased (Duggan & Smith, 2014). This investigation examined how 212 university undergraduate Facebook users estimated success with helping others use Facebook when learner’s age (20, 40, 60 year olds.) and type of acquaintance (friend or kin) was manipulated in hypothetical scenarios. In these scenarios, a person is identified as KW, described as being a college student much like the participant. KW has 20, 40 or 60 year -old acquaintances, a friend or a ki n at each age, all wanting KW’s help learning about social media. This was the only information provided. Qualities and strengths of these interpersonal relationships were not examined. Results from repeated measures 2x3 ANOVA showed a significant main eff ect for age, but no effect for acquaintance type. Results showed no significant interaction. Although the age demographic above 50 years is the fastest growing SNS group, results showed possible age stereotyping among youth when they assist older adults le arning to use SNS. This age effect may be lessened as older adults become more skillful social media users. These findings are limited because of the sample demographics and a lack of identifying qualities of participants’ attributions about the hypothetic al friends or relatives. Future research using multiple items per condition might be able to further elucidate how the type of associations between helper and learner, close or distant, positive or negative, would influence outcomes

Appréhension ou évitement : l’expérience des résidents en médecine interne par rapport aux procédures invasives au chevet du patient

Background: Internal Medicine (IM) residents are required to perform bedside procedures for diagnostic and therapeutic purposes. Residents’ experiences with procedures vary widely, for unclear reasons. Objective: To explore IM residents’ experiences with performing bedside procedures and to identify barriers and facilitators to obtaining sufficient experience. Methods: Using an inductive, thematic approach, we conducted five individual semi-structured interviews and one focus group with seven IM residents (12 residents in total) during the 2017-2018 academic year at a Canadian tertiary care centre. We used iterative, open-ended questions to elicit residents’ experiences, and barriers and facilitators, to performing bedside procedures. Transcripts were analyzed for themes using Braun and Clarke’s method.  Results: We identified four themes 1) Patient-specific factors such as body habitus and procedure urgency; 2) Systems factors such as time constraints and accessibility of materials; 3) Faculty factors including availability to supervise, comfort level, and referral preferences, and 4) Resident-specific factors including preparation, prior experiences, and confidence. Some residents expressed procedure-related anxiety and avoidance. Conclusion: Educational interventions aimed to improve procedural efficiency and ensure availability of supervisors may help facilitate residents to perform procedures, yet may not address procedure-related anxiety. Further study is required to understand better how procedure-averse residents can gain confidence to seek out procedures.Contexte : Les résidents en médecine interne (MI) sont amenés à effectuer des procédures au chevet du patient à des fins diagnostiques et thérapeutiques. Les expériences des résidents par rapport à ces procédures varient considérablement, et nous ne savons pas pourquoi.Objectif : Explorer les expériences des résidents en médecine interne en matière d’interventions au chevet du patient et recenser les facteurs qui entravent ou, au contraire, facilitent l’acquisition d’une expérience suffisante.Méthodes : En utilisant une approche inductive et thématique, nous avons mené cinq entretiens individuels semi-structurés et un groupe de discussion avec sept résidents IM (12 résidents au total) dans un centre de soins tertiaires canadien au cours de l’année universitaire 2017-2018. Nous avons utilisé des questions ouvertes itératives pour interroger les résidents sur leur expérience d’intervention au chevet des patients, ainsi que sur les obstacles et les facilitateurs de ces interventions. Les transcriptions ont été analysées pour dégager des thèmes selon la méthode de Braun et Clarke. Résultats : Nous avons relevé quatre thèmes : 1) les facteurs spécifiques aux patients comme l’habitus corporel et l’urgence de l’intervention; 2) les facteurs systémiques comme les contraintes de temps et l’accès au matériel; 3) les facteurs liés aux enseignants, notamment leur disponibilité pour superviser, le fait d’être à l’aise avec eux et leurs préférences en matière de référence; et 4) les facteurs spécifiques aux résidents, à savoir la préparation, les expériences antérieures et la confiance. Certains résidents ont déclaré vivre de l’anxiété face aux procédures et les éviter.Conclusion : Les initiatives éducatives visant à améliorer l’efficacité des procédures et à assurer la disponibilité de superviseurs peuvent faciliter leur réalisation par les résidents, mais elles ne peuvent pas atténuer l’anxiété que ces interventions suscitent chez ces derniers. Des études supplémentaires sont nécessaires pour trouver des façons d’accroître la confiance des résidents qui sont réticents face aux interventions au chevet du patient