ORCID Profile
0000-0001-9565-3140
Current Organisation
Argonne National Laboratory
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Publisher: International Union of Crystallography (IUCr)
Date: 26-03-2018
DOI: 10.1107/S160057671800403X
Abstract: The CORELLI instrument at Oak Ridge National Laboratory is a statistical chopper spectrometer designed and optimized to probe complex disorder in crystalline materials through diffuse scattering experiments. On CORELLI, the high efficiency of white-beam Laue diffraction combined with elastic discrimination have enabled an unprecedented data collection rate to obtain both the total and the elastic-only scattering over a large volume of reciprocal space from a single measurement. To achieve this, CORELLI is equipped with a statistical chopper to modulate the incoming neutron beam quasi-randomly, and then the cross-correlation method is applied to reconstruct the elastic component from the scattering data. Details of the implementation of the cross-correlation method on CORELLI are given and its performance is discussed.
Publisher: Elsevier BV
Date: 12-1997
Publisher: AIP Publishing
Date: 06-1998
DOI: 10.1063/1.367775
Abstract: Neutron diffuse scattering in the form of rod-like features has been observed in single crystals of the layered CMR material La2−2xSr1+2xMn2O7 (x=0.4,0.36), consistent with the presence of 2D ferromagnetic spin correlations. These diffuse features are observed over a wide temperature region. However, their coherence length does not appear to erge at TC, although there is evidence of the development of three-dimensional correlations around ferromagnetic reflections of the 3D-ordered magnetic structure close to TC. Quasi-elastic neutron scattering on a ceramic s le of x=0.3 shows that the lifetime of these ferromagnetic correlations increases at T→TC. They exhibit a spin-diffusion constant above TC of ∼5 meV Å2, much lower than that reported for La2/3Ca1/3MnO3. We discuss the relationship of these magnetic correlations to models of the ferromagnetic transition in CMR compounds.
Publisher: Informa UK Limited
Date: 2002
DOI: 10.1080/09638280110096250
Abstract: Vision and hearing loss are prevalent disorders in older adults although their effects on communication are not well documented. The purpose of this study was to investigate the perceptions of older adults with sensory loss and their communication partners with regard to their communication, situational difficulties and conversational needs. Questionnaire results revealed that the sensory loss group experienced a range of functional vision and hearing difficulties. Over two-thirds of subjects reported frequent conversational difficulty, particularly in background noise and group conversations. Most subjects used clarification requests (mainly non-specific clarification and repetition requests) to overcome misunderstandings. By contrast, the communication partners reported few communication difficulties and claimed that they proactively eliminated or controlled environmental, speaker and listener variables to optimize conversation. The most frequently reported strategy was repetition. The findings suggest that older adults with sensory loss experience communication disruptions, which in many instances are not resolved. To optimize communication efficacy in this population, a communication training programme for people with sensory loss and their communication partners is highly recommended.
Publisher: American Physical Society (APS)
Date: 07-2002
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Raymond Osborn.