Energy stability analysis for a hybrid fluid-kinetic plasma model

In plasma physics, a hybrid fluid-kinetic model is composed of a magnetohydrodynamics (MHD) part that describes a bulk fluid component and a Vlasov kinetic theory part that describes an energetic plasma component. While most hybrid models in the plasma literature are non-Hamiltonian, this paper investigates a recent Hamiltonian variant in its two-dimensional configuration. The corresponding Hamiltonian structure is described along with its Casimir invariants. Then, the energy-Casimir method is used to derive explicit sufficient stability conditions, which imply a stable spectrum and suggest nonlinear stability

E-LIS : the Open Archive for Library and Information Science

Founded in 2003, E-LIS is an open access archive for library and information studies. It is free for searching and depositing. E-LIS is hosted by the CILEA group in Italy, and managed by an international group of volunteer editors from over 45 countries. The archive supports 22 languages

An Enumeration of the Equivalence Classes of Self-Dual Matrix Codes

As a result of their applications in network coding, space-time coding, and coding for criss-cross errors, matrix codes have garnered significant attention; in various contexts, these codes have also been termed rank-metric codes, space-time codes over finite fields, and array codes. We focus on characterizing matrix codes that are both efficient (have high rate) and effective at error correction (have high minimum rank-distance). It is well known that the inherent trade-off between dimension and minimum distance for a matrix code is reversed for its dual code; specifically, if a matrix code has high dimension and low minimum distance, then its dual code will have low dimension and high minimum distance. With an aim towards finding codes with a perfectly balanced trade-off, we study self-dual matrix codes. In this work, we develop a framework based on double cosets of the matrix-equivalence maps to provide a complete classification of the equivalence classes of self-dual matrix codes, and we employ this method to enumerate the equivalence classes of these codes for small parameters

The turn to precarity in twenty-first century fiction

This is an open access article. Copyright © 2014 by Walter de Gruyter GmbH.Recent years have seen several attempts by writers and critics to understand the changed sensibility in post-9/11 fiction through a variety of new -isms. This essay explores this cultural shift in a different way, finding a ‘turn to precarity’ in twenty-first century fiction characterised by a renewal of interest in the flow and foreclosure of affect, the resurgence of questions about vulnerability and our relationships to the other, and a heightened awareness of the social dynamics of seeing. The essay draws these tendencies together via the work of Judith Butler in Frames of War, in an analysis of Trezza Azzopardi’s quasi-biographical study of precarious life, Remember Me

Manufacturing techniques using dycril

Fluidic elements are manufactured in various ways such as injection moulding, epoxy casting and from photo-sensitive ceramic and plastics. Most of the initial work on elements has been carried out using Dycril because of its ease in processing and the equipment required is fairly cheap and simple. Many companies have then developed satisfactory designs using Dycril and used them as ‘masters' in other production processes. Most users of Dycril have reported that nozzle widths of less than 0.015in cannot be satisfactorily etched from 0.040in thick Dycril. Various methods of etching have been tried at Cranfield and this report outlines some of the difficulties encountered and suggests a standard pattern to be followed from the drawings of the master at ten times full size through to the complete element

Freedom for scholarship in the internet age

Discusses the purpose of scholarship, the potential of the internet to further the purposes of scholarship, and the role of librarians in transformative change in scholarly communication. Addresses the rapidly growing volume of information, and discusses three approaches to coping; writing less and collaborating are recommended. Talks about the work of librarians in scholarly communication as the basis for opening up conversation on broader change. Presents evidence that a fully open access scholarly journal publishing system would be possible at much lower cost than libraries are currently paying

Aging reimagined: Exploring older women’s attitudes to aging through reader response

This article is available open access through the publisher’s website through the link below. Copyright @ 2011 The Author.Since the 1970s, concern with questions of reception within literary studies has been, at best, sporadic. This essay presents early insights from a pioneering research study, conducted in 2009–10, involving a rehabilitated form of reader-response analysis. Working with 80 volunteers (of average age 70), the study used fiction to create a space of critical reflection on the changing experience of aging. Volunteers were recruited from the Universities of the Third Age, a network of self-help cooperatives for older people: over the course of a year, they read and reflected on a series of fictional texts. This essay focuses on the responses of older women readers to one particular novel, Barbara Pym's Quartet in Autumn. Setting their varied and thought-provoking responses within the changing context of contemporary age-culture, the essay highlights some of the neglected possibilities of reader-response as a mode of analysis capable of shedding significant new light on the gendered experience of aging