41,255 research outputs found
Data for 'A model for stochastic prediction of track support stiffness'
Full text linkThis dataset supports the publication:
Le Pen, L., Milne, D., Watson, G., Harkness, J., & Powrie, W. (Accepted/In press). A model for stochastic prediction of track support stiffness. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit.
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The influence of membranes on tests of coarse-grained materials at low cell pressures
No full textIn triaxial tests on small specimens of sands/silts and clays, cell pressures are usually greater than 100 kPa and membranes are relatively thin (~0.3 mm). In such tests the influence of the membrane on the stresses on the specimen is small and is usually ignored. Where cell pressures and/or the specimen strength are low the influence of the membrane increases. In such circumstances membrane corrections may be applied assuming right cylinder deformation and thin wall or circular hoop behaviour. However, there are circumstances in which these methods of membrane correction are invalid. For example when the material tested has a large particle size relative to the specimen diameter (e.g. D100 approaches 1/6 of the specimen diameter) membranes behave neither as thin walls nor as circular hoops. Tests on railway ballast fall into this category; the large particles require larger specimens and thicker membranes. The thickness of these membranes is more significant as a proportion of specimen diameter and may have a greater influence on the stresses on the specimen. Furthermore, tests are often carried out at low cell pressures to replicate field conditions where membrane influence is greater. The influence of the membrane in such tests is investigated by means of discrete element method simulations using spherical particles in a face centred cubic packing. The membrane is modelled as an array of points surrounding the specimen and connected elastically. Using a closed form solution for the packing used, the influence of the membrane on initial specimen strength is quantified for differing membrane properties. Furthermore, as a first step to developing a way to correct for membrane influence on large grain sized physical specimens, parameters are identified that correlate to membrane influences
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Is musculoskeletal pain more common now than 40 years ago?: Two population-based cross-sectional studies
No full textTo test the hypothesis that the prevalence of specific musculoskeletal pain symptoms has increased over time in the northwest region of England. To meet this objective we have examined the difference in the prevalence of low back, shoulder and widespread pain between the 1950s and today using historical data collected by the Arthritis Research Campaign (arc). Methods. Two cross-sectional surveys conducted over 40 yr apart in the northwest region of England. The status of two regional pain sites and widespread pain was determined using interview and questionnaire responses, for the earlier and later studies respectively. Subjects were classified positively if they reported low back pain, shoulder pain or widespread pain on the day of the survey. Rates were standardized to the Greater Manchester population. Results. There were large differences in the prevalence of musculoskeletal pain between the two surveys. For all three symptoms examined prevalence increased from 2- to 4-fold between the two surveys. In both surveys low back pain was more common in women. Shoulder and widespread pain was less prevalent in women than in men in the earlier survey but by the time of the later survey women reported more pain at these sites. Conclusions. The prevalence of musculoskeletal pain is much higher than that reported over 40 yr ago. The change in prevalence is unlikely to be entirely due to the study design; other possible explanations such as the increased reporting or awareness of these symptoms is discussed. © The Author 2005. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
Landsat MSS classification of fire fuel types in Wood Buffalo National Park, northern Canada
No full textJ1: Global Ecology & Biogeography Letters; M3: Article; Milne, David Franklin, Steven E. Wilson, Bradley A. Ghitter, Geoff Heathcott, Mark McCaffrey, Thomas M. Ow, Charlotte F. Y.; Source Information: Mar1994, Vol. 4 Issue 2, p33; Subject Term: FOREST fires; Author-Supplied Keyword: Canada (Wood Buffalo National Park); Author-Supplied Keyword: Forest fire; Author-Supplied Keyword: Fuel type classification; Author-Supplied Keyword: Landsat data; Number of Pages: 0p; Document Type: Articl
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
An aerostable drag-sail device for the deorbit and disposal of sub-tonne, low earth orbit spacecraft
Full text linkThere is an increasing amount of debris in low Earth orbit arising from the
disintegration and collision of old spacecraft which have not been removed from
orbit. A ‘bolt-on’ deorbit device to be attached to new spacecraft is therefore
proposed, which would deploy an aerostable drag sail at end-of-life. This drag sail
would interact with the rarefied atmospheric gases and plasma present at altitudes of
up to 1,000 km and thus denude energy from the orbit, causing it to become lower
and lower until final re-entry of the host becomes inevitable. At this point the drag
sail would collapse and both the host and the deorbit device would be destroyed by
aerothermodynamic forces.
This work develops the deorbit device concept by demonstrating that aerostable drag
enhancement is an effective and competitive deorbit mechanism. This is done by:
• Calculating the aerodynamic, solar radiation pressure and gravitational
influences on the deployed drag sail and using them to model the
performance of the device.
• Using the results of that modelling to identify the optimum shape, size and
deployment conditions of the drag sail.
• Further calculating the structural strength required to resist the aerodynamic
loads until the desired collapse altitude.
• And finally by using that information to assemble a conceptual design which
demonstrates the practicability of the system
A Relational Unsupervised Approach to Author Identification
No full textIn the last decades speaking and writing habits have changed.
Many works faced the author identification task by exploiting frequencybased
approaches, numeric techniques or writing style analysis. Following
the last approach we propose a technique for author identification
based on First-Order Logic. Specifically, we translate the complex data
represented by natural language text to complex (relational) patterns
that represent the writing style of an author. Then, we model an author
as the result of clustering the relational descriptions associated to the
sentences. The underlying idea is that such a model can express the typical
way in which an author composes the sentences in his writings. So,
if we can map such writing habits from the unknown-author model to
the known-author model, we can conclude that the author is the same.
Preliminary results are promising and the approach seems viable in real
contexts since it does not need a training phase and performs well also
with short texts
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