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3. Implementation of Traction Constraints in Bragg-edge Neutron Transmission Strain Tomography

Author

Hendriks, J. N., Gregg, A. W. T., Wensrich, C. M., and Wills, W.

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Materials Science
Abstract

Several recent methods for tomographic reconstruction of stress and strain fields from Bragg-edge neutron strain images have been proposed in the literature. This paper presents an extension of a previously demonstrated approach based on Gaussian Process regression which enforces equilibrium in the method. This extension incorporates knowledge of boundary conditions, primarily boundary tractions, into the reconstruction process. This is shown to increase the rate of convergence and is more tolerant of systematic errors that may be present in experimental measurements. An exact expression for a central calculation in this method is also provided which avoids the need for the approximation scheme that was previously used. Convergence of this method for simulated data is compared to existing approaches and a reconstruction from experimental data is provided. Validation of the results to conventional constant wavelength strain measurements and comparison to prior methods shows a significant improvement.

Published
2018
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37. Leisure

Author

Wills, W. David, primary and Younghusband, Eileen, additional

Published
2021
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49. The Archaeology of the Bonito Paleochannel Cycle at Chaco Canyon, New Mexico: Implications for Communal and Household Level Investment in Water Management.

Author

Wills, W. H., Williams, Katharine, and Dorshow, Wetherbee B.

Subjects
*WATER management, *WATER levels, *INVESTMENT management, *TRANSBOUNDARY waters, *WATER harvesting, *CANYONS, *ANCESTRAL Pueblo culture
Abstract

This study examines the archaeological record for water management in Chaco Canyon, New Mexico, in relation to the Bonito Paleochannel cycle, ca. AD 1075–1150. We present evidence for a canal system at Pueblo Bonito that was destroyed by the entrenchment of the paleochannel. This canal system is associated with the peak of great house construction. Other water control features throughout the canyon were small and date to the period of paleochannel aggradation or afterward. We suggest that while the Pueblo Bonito canals represent some degree of corporate group investment, small features were managed at the household level. The limited archaeological evidence for formal water control infrastructure can be explained at least in part by the physical geography of Chaco Canyon, which we view as essentially a regional-scale water harvesting structure. [ABSTRACT FROM AUTHOR]

Published
2024
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