2,854 research outputs found
Engine non-containment: UK risk assessment methods
More realistic guideline data must be developed for use in aircraft design in order to comply with recent changes in British civil airworthiness requirements. Unrealistically pessimistic results were obtained when the methodology developed during the Concorde SST certification program was extended to assess catastrophic risks resulting from uncontained engine rotors
Through the Looking Glass:A Comparative Analysis of the CareerPatterns of Rural Female Administratorsin Saskatchewan and Texas
This article stems from research that examined the effect of the rural context on the career patterns of female administrators in rural public school divisions in the province of Saskatchewan, Canada, and in the state of Texas, United States. These two studies examined (a) the nature of rural communities and its relationship to womenâs career paths in educational administration, and (b) barriers and supports faced by female administrators. The purpose of this article is to outline the findings of the study in relation to emergent issues for administration by women in rural areas.Cet article dĂ©coule dâune recherche portant sur lâeffet du contexte rural sur le profil de carriĂšres dâadministratrices dans des divisions scolaires rurales en Saskatchewan, au Canada, et dans lâĂ©tat du Texas, EUA. La recherche visait: (a) la nature des communautĂ©s rurales et le rapport entre celle-ci et le profil de carriĂšres des administratrices dans le domaine de lâĂ©ducation, et (b) les Ă©lĂ©ments qui se sont posĂ©s en obstacles aux administratrices et ceux qui leur ont apportĂ© un appui. Lâobjectif de cet article est de tracer les grandes lignes de cette Ă©tude par rapport aux questions Ă©mergentes qui touchent les femmes en administration dans les rĂ©gions rurales
Shining Lonely Stars? Career Patterns of Rural Texas Female Administrators
This paper stems from research that examined the impact of the rural context upon the career patterns of women educational administrators in rural public school districts in the state of Texas. The study examined two pertinent issues for women in rural education: (a) the nature of rural communities and its relationship to female career paths in educational administration, and (b) barriers and supports faced by female administrators in the rural context. The purpose of this paper will be to outline the findings of the study in relation to the emergent issues for rural female administrators
Effects of high energy photon emissions in laser generated ultra-relativistic plasmas: real-time synchrotron simulations
We model the emission of high energy photons due to relativistic charged
particle motion in intense laser-plasma interactions. This is done within a
particle-in-cell code, for which high frequency radiation normally cannot be
resolved due to finite time steps and grid size. A simple expression for the
synchrotron radiation spectra is used together with a Monte-Carlo method for
the emittance. We extend previous work by allowing for arbitrary fields,
considering the particles to be in instantaneous circular motion due to an
effective magnetic field. Furthermore we implement noise reduction techniques
and present validity estimates of the method. Finally, we perform a rigorous
comparison to the mechanism of radiation reaction, and find the emitted energy
to be in excellent agreement with the losses calculated using radiation
reaction
Teaching Principals in Small Rural Schools: âMy Cup Overflowethâ
This paper presents the results of interviews with 12 Manitoba and Alberta rural teaching principals regarding their leadership practices in small schools. The overwhelming theme mentioned by these teaching principals was the joy and sense of purpose they found in the relationships they cultivated with children, staff, and community members because of the âadvantagesâ they had working in small schools. The paper details the small schools context within which teaching principals are working in these two provinces and outlines the role of reciprocal relationality that is central to their leadership efforts in small rural schools.Cet article prĂ©sente les rĂ©sultats dâentrevues auprĂšs de douze directeurs-enseignants dâĂ©coles rurales au Manitoba et en Alberta portant sur les pratiques de leadership dans les petites Ă©coles. Le thĂšme dominant qui en est ressorti est celui de la joie et le sentiment dâun but Ă atteindre quâils retiraient des rapports entretenus avec les enfants, le personnel et les membres de la communautĂ© et quâils associaient aux « bienfaits » de travailler dans une petite Ă©cole. Lâarticle dĂ©crit en dĂ©tail le contexte scolaire dans lequel travaillent les directeurs-enseignants dans ces deux provinces, et dresse un portrait du rĂŽle de la relationnalitĂ© rĂ©ciproque qui est au centre de leurs efforts comme dirigeants de petites Ă©coles en milieu rural.
Testing Gravity in the Outer Solar System: Results from Trans-Neptunian Objects
The inverse square law of gravity is poorly probed by experimental tests at
distances of ~ 10 AUs. Recent analysis of the trajectory of the Pioneer 10 and
11 spacecraft have shown an unmodeled acceleration directed toward the Sun
which was not explained by any obvious spacecraft systematics, and occurred
when at distances greater than 20 AUs from the Sun. If this acceleration
represents a departure from Newtonian gravity or is indicative of an additional
mass distribution in the outer solar system, it should be detectable in the
orbits of Trans-Neptunian Objects (TNOs). To place limits on deviations from
Newtonian gravity, we have selected a well observed sample of TNOs found
orbiting between 20 and 100 AU from the Sun. By examining their orbits with
modified orbital fitting software, we place tight limits on the perturbations
of gravity that could exist in this region of the solar system.Comment: 20 pages, 4 figures, 2 tables, uses AASTex v5.x macro
Thermodynamics of a Heavy Ion-Irradiated Superconductor: the Zero-Field Transition
Specific heat measurements show that the introduction of amorphous columnar
defects considerably affects the transition from the normal to the
superconducting state in zero magnetic field. Experimental results are compared
to numerical simulations of the 3D XY model for both the pure system and the
system containing random columnar disorder. The numerics reproduce the salient
features of experiment, showing in particular that the specific heat peak
changes from cusp-like to smoothly rounded when columnar defects are added. By
considering the specific heat critical exponent alpha, we argue that such
behavior is consistent with recent numerical work [Vestergren et al., PRB 70,
054508 (2004)] showing that the introduction of columnar defects changes the
universality class of the transition.Comment: 4 pages, 2 figure
The Generic, Incommensurate Transition in the two-dimensional Boson Hubbard Model
The generic transition in the boson Hubbard model, occurring at an
incommensurate chemical potential, is studied in the link-current
representation using the recently developed directed geometrical worm
algorithm. We find clear evidence for a multi-peak structure in the energy
distribution for finite lattices, usually indicative of a first order phase
transition. However, this multi-peak structure is shown to disappear in the
thermodynamic limit revealing that the true phase transition is second order.
These findings cast doubts over the conclusion drawn in a number of previous
works considering the relevance of disorder at this transition.Comment: 13 pages, 10 figure
Interaction between clients and physiotherapists in group exercise classes in geriatric rehabilitation
The aim of this paper is to explore how older people construct their interaction in group exercise classes in geriatric rehabilitation and what is their contribution to the interaction. Discourse analysis was employed and data, consisting of seven videotaped group-based exercise sessions, were collected from 52 older people (aged 66â93 years) and nine rehabilitation professionals in seven rehabilitation centres. Four discourse categories were found. In âtaciturn exercisingâ, older people remained verbally silent but physically active. In âsubmissive disagreeingâ, older people opposed the professionalsâ agenda by displaying reluctant consent to proposals. In âresilient endeavouringâ, older adults persisted on their course of action, regardless of the disapproval of the professionals. In âlay helpingâ, older people initiated spontaneous encouragement, but also gave verbal and physical assistance to their peers. Older people's meaningful contribution to interaction, whilst it may challenge the institutional flow of activities, can constitute an integral part of the re-ablement process of rehabilitation
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