Index Catalog // ScholarsArchive@OSU

Creator:: Nairn, John A.
Abstract:: Finite element analysis was used to study the effective transverse modulus of solid wood for all possible end-grain patterns. The calculations accounted for cylindrical anisotropy of wood within rectangular specimens and explicitly modeled wood as a composite of earlywood and latewood. The effective modulus was significantly reduced by growth ring...
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Full Text:: properties John A. Nairn* Wood Science & Engineering, Oregon State University, Corvallis, OR, USA

Creator:: Nairn, John A.
Abstract:: A new approach was developed for the evaluation of energy release rate by the virtual crack closure technique in quadratic and linear elements. The generalized method allows arbitrary placement of the side nodes for quadratic elements and thus includes both standard elements, with mid-side nodes, and singularity elements, with quarter-point...
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Full Text:: Arbitrarily-Placed Side Nodes and Consistent Nodal Forces John A. Nairn Received: 30 March 2011 / Accepted

Creator:: Friesner, Richard, Nairn, John A., and Sauer, Kenneth
Abstract:: We have developed a method for the determination of the orientational distribution function of partially ordered systems from the EPR line shape that is an alternative to the usual one of expansion in the elements of the Wigner rotation matrices. The method can be applied to distribution functions whose expansion...
Resource Type:: Article

Creator:: Friesner, Richard, Nairn, John A., and Sauer, Kenneth
Abstract:: We have developed a method for determining the response of a static, partially ordered ensemble of molecules to various types of electromagnetic probes. In our formalism a physical model is constructued for the orientational distribution function, which is represented as a volume integral over a set of weighting functions. Procedures...
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Full Text:: ordered ensembles. I. One vector problems Richard Friesner,a) John A. Nairn,b) and Kenneth Sauer

Creator:: Nairn, John A., Friesner, R., and Sauer, Kenneth
Abstract:: We have expanded on the results of an earlier paper [J. Chem. Phys. 72, 221 (1980)] which deals with a method for determining the response of a static, partially ordered ensemble of molecules to various types of electromagnetic probes. In this paper we consider types of spectroscopy whose response depends...
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Full Text:: ordered ensembles. II. Two-vector problems John A. Nairn,a) R. Friesner,b) and Kenneth Sauer

Creator:: Sinha, Arijit, Nairn, John A., and Gupta, Rakesh
Abstract:: Fracture toughness of wood and wood composites has traditionally been characterized by a stress intensity factor, an initiation strain energy release rate (G[subscript init]) or a total energy to fracture (G[subscript f]). These parameters provide incomplete fracture characterization for these materials because the toughness changes as the crack propagates. Thus...
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Full Text:: 737 3385 John A. Nairn Professor and Richardson Chair john.nairn@oregonstate.edu Rakesh

Creator:: Nairn, John A., Friesner, Richard, Frank, Harry A., and Sauer, Kenneth
Abstract:: We have developed a new approach to the theory of linear dichroism in partially ordered systems. The description of the partially ordered ensemble uses a density of states function, D(θ, ϕ, Δ), which gives the probability that the direction of polarization for incident polarized light has spherical angles θ and...
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Full Text:: CENTERS AND WHOLE CELLS OF PHOTOSYNTHETIC BACTERIA JOHN A. NAIRN, RICHARD FRIESNER, HARRY A. FRANK, AND

Creator:: Tappeiner, John C., Huffman, David W. (William), 1962-, Marshall, David, Spies, Thomas A., and Bailey, John D.
Abstract:: We studied the ages and diameter growth rates of trees in former Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) old-growth stands on 10 sites and compared them with young-growth stands (50-70 years old, regenerated after timber harvest) in the Coast Range of western Oregon. The diameters and diameter growth rates for the...
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Full Text:: in coastal Oregon1 John C. Tappeiner, David Huffman, David Marshall, Thomas A. Spies, and John D

Creator:: Turko, Bojan T., Nairn, John A., and Sauer, Kenneth
Abstract:: A single‐photon timing system is described which is capable of extracting fluorescence lifetimes as short as 25 ps. The system is an improved version of an earlier apparatus. The new system uses a synchronously pumped, mode‐locked dye laser with 10‐ps pulses operating at 82‐MHz repetition rate. A fast photodetector and...
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Full Text:: , California 94720 John A. Nairnb) and Kenneth Sauer Chemical Biodynamics Division, Lawrence Berkeley

Creator:: Huang, Minghuang, Nairn, John A., Liu, Feng, and Lagally, M. G.
Abstract:: We perform two-dimensional linear elastic finite element analysis to investigate the mechanical stability of ultrathin Ge/Si film grown on or bonded to SiO₂, using imperfect interface elements between Si and SiO₂ to model Si/SiO₂ interfacial slippage. We demonstrate that the overall composite film is stable when only the tangential slippage...
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Full Text:: of Si/SiO2 interface Minghuang Huang,a! John A. Nairn, and Feng Liu Department of Materials Science

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