5,060 research outputs found
Roger Abrahams, author
No full textRoger Abrahams, director of the African and Afro-American Research Institute at the University of Texas-Austin and author of Positively Black, argues the case for ethnic diversity in this interview. He also discusses that the idea of "new ethnicity" is not restricted to black or brown America and he sees a widespread return to old mores inherent in the traditional ethnic value system. Interviewed by WTMJ-TV host Jim Peck.GrayscaleSoun
Three-dimensional spectral measurements of paint samples using optical coherence tomography
No full textIn this study, we describe a method for measuring the spectral reflectance of a paint layer at both the surface and in the volume of the paint layers. We first present a fringes model which illustrates the possibilities for spectral reconstruction using a Short-Time-Fourier-Transform algorithm. We investigate the remaing percentage errors and identified that there is a strong fluctuation along the wavelength range of the spectrometer. Then, we demonstrate the validity of our approach experimentally by measuring the spectral reflectance of a paint layer using a custom-made visible light optical coherence tomography system. There, we reconstruct the spectral reflectance of a paint layer by probing the surface and a depth range below the surface. Finally, we show the importance to include a wavelength sensitive correction in the reconstruction for taking into account the spectral shape of the light in the reference path of the interferometer. This work is part of the Down To The Ground project, in which the results of the OCT inspection will be used directly by a consortium of technical art historians and conservators.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Structural Integrity & Composite
Unlucky for Some : 13 poems by Roger McGough
No full textInspired by and featuring the poetry of Roger McGough (by permission of the author), Unlucky for Some is a spare, minimalistic work about homelessness, mental illness and class division performed entirely in slow motion.\ud
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This multimedia work also utilised prerecorded and live feed video and music, and experimented with synchronous and asynchonous live and mediatised performance
Eric Groves
No full textPhotograph used for a story in the Daily Oklahoman newspaper. Caption: "Groves, an attorney, lives at 4400 Harvey Parkway.
Application of shearography and the percussion method for the structural inspection of wall paintings: A case study of St. Christopher in Maria Church, Nisse
No full textStructural delamination in mural paintings is a complex phenomenon and is considered among the most frequent types of damage. In conservation practice, the most common technique to identify structural detachments is the percussion method. Full-field optical techniques based on interferometry, such as shearography, can provide a more scientifically substantiated evaluation of the condition of heterogeneous structures of wall paintings. The empirical nature of the percussion method was observed during the condition assessment of two medieval wall paintings in Maria Church, Nisse, the Netherlands. It can be argued that, to allow the formulation of specific treatment needs for structural delamination in wall paintings, accurate defect mapping and characterisation is needed. The application of shearography was believed to provide a holistic representation of the condition of the structure of the wall painting depicting St. Christopher in Maria Church. Preliminary comparison of the methods involved revealed a degree of matching between results obtained. Discrepancies, i.e. areas deemed extremely vulnerable during percussion testing that were not detected by shearography, are debatably caused by the misinterpretation of the acoustic response during percussion testing or the inability of shearography to detect in depth structural defects. Further research regarding shearography should focus on providing more information about the depth of structurally delaminated areas within the heterogeneous layered structure of wall paintings.Structural Integrity & Composite
Application of shearography with thermal loading for structural inspection of Rembrandt’s Night Watch
No full textThe assessment of the structural condition of cultural heritage objects is important for conservation interventions and their long-term preservation. This investigation concerns The Night Watch (1642), a large-format 17th-century canvas painting by Rembrandt van Rijn that is on display in the Rijksmuseum, Amsterdam. This painting, which has a complex treatment history, has various damaged areas and has undergone three wax-resin relinings. In 1975 the canvas was slashed twelve times with a serrated dinner knife, including several long slashes in the area of Captain Frans Banninck Cocq’s breeches. In 2021, prior to a proposed new structural intervention involving retensioning of the canvas, it was important to evaluate the structural condition of the repaired slashes and of another repair, specifically an old canvas insert in the drum. For this, an in-situ inspection was carried out in the Rijksmuseum as a part of Operation Nightwatch. 3D shearography instrument with thermal loading was used to inspect these two areas of interest on the reverse of The Night Watch. The results showed that the out-of-plane strain in the breeches does not show any large deviations, which alleviated conservators’ concerns about the adhesion of the lining canvas and stability of previous repairs in this region. The patch in the drum showed higher out-of-plane strain variations. This was explained by the lower quality of the patched canvas compared to the repaired slashes in the breeches of Banninck Cocq. Overall, 3D shearography provided valuable inspection results for assurances regarding the structural integrity of the 1975 repairs and the wax-resin lining in The Night Watch, reducing the risks and providing the confidence to proceed with the planned retensioning of the canvas.Structural Integrity & Composite
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
A Conversation with Roger Welsch
No full textIn this session, moderated by Barre Toelken and William A. "Bert" Wilson, audience members have the opportunity to discuss Roger Welsch's plenary lecture, and his other works and ideas, with the author
Spoken language reference materials
No full textContent of the CD distributed with the Handbook of Standards and Resources for Spoken Language Systems. Edited by Dafydd Gibbon, Roger Moore, Richard Winski. Published by Mouton de Gruyter, 1997
Development of shearography for surface strain measurement of non-planar objects
No full textThe subject of this thesis is the development of optical instrumentation for surface strain
measurement of non-planar objects. The speckle interferometry technique of
shearography is used to perform quantitative measurements of surface strain on nonplanar
objects and to compensate these measurements for the errors that are due to the
shape and slope of the object.
Shearography is an optical technique that is usually used for defect location and for
qualitative strain characterisation. In this thesis a multi-component shearography system
is described that can measure the six components of displacement gradient. From these
measurements the surface strain can be fully characterised. For non-planar objects an
error is introduced into the displacement gradient measurement due to the variation of
the sensitivity vector across the field of view and the variation in the magnitude of
applied shear due to the curvature of the object surface. To correct for these errors
requires a knowledge of the slope and shape of the object.
Shearography may also be used to measure object slope and shape by a source
displacement technique. Therefore slope, shape and surface strain may be measured
using the same optical system.
The thesis describes a method of multiplexing the shear direction using polarisation
switching, a method of measuring the source position using shadow Moire and the
shearography source displacement technique for measuring the surface slope and shape
of objects. The multi-component shearography system is used to perform measurements
of the six components of surface strain, on an industrial component, with a correction
applied for errors due to the shape and slope of the object
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