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    Author(s): Steve P. VerrillDavid E. KretschmannVictoria L. HerianMichael Wiemann; Harry A. Alden
    Date: 2010
    Source: Research Paper FPL-RP-658. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2010: [92] p.
    Publication Series: Research Paper (RP)
    Station: Forest Products Laboratory
    PDF: View PDF  (1.37 MB)

    Description

    In this paper we raise three technical concerns about Evans’s 1999 Appita Journal “variance approach” to estimating microfibril angle. The first concern is associated with the approximation of the variance of an X-ray intensity half-profile by a function of the microfibril angle and the natural variability of the microfibril angle, S2 ≈ μ2/2 + σ2. The second concern is associated with the approximation of the natural variability of the microfibril angle by a function of the microfibril angle, σ2 ≈ f(μ). The third concern is associated with the fact that the variance approach was not designed to handle tilt in the fiber orientation. All three concerns are associated with potential biases in microfibril angle estimates. We raise these three concerns so that other researchers interested in understanding, implementing, or extending the variance approach or in comparing the approach to other methods of estimating MFA will be aware of them.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Verrill, Steve P.; Kretschmann, David E.; Herian, Victoria L.; Wiemann, Michael; Alden, Harry A. 2010. Concerns about a variance approach to the X-ray diffractometric estimation of microfibril angle in wood. Research Paper FPL-RP-658. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2010: [92] p.

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    Keywords

    SilviScan, microfibril angle, bias, cell cross-section, microfibrils, wood anatomy, X-ray diffractometer, X-ray diffraction

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