Index Catalog // ScholarsArchive@OSU

NairnJohnForestryDirectCalculationOrientational(Erratum).pdf

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...

NairnJohnForestryDirectCalculationOrientational.pdf

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...

Thermal degradation of bending strength of plywood and oriented strand board: a kinetics approach

Creator:: Sinha, Arijit, Nairn, John A., and Gupta, Rakesh
Abstract:: The construction industry has relied heavily on wood and wood-based composites, such as oriented strand board (OSB) and plywood for timber frame construction. Therefore, it is highly imperative to categorize the response of wood-based composites when exposed to elevated temperatures for a sustained period of time. The essence of fire-resistant...
Resource Type:: Article

Thermal Degradation of Lateral Yield Strength of Nailed Wood Connections

Creator:: Sinha, Arijit, Gupta, Rakesh, and Nairn, John A.
Abstract:: This study investigated the effect of exposure to elevated temperature on the yield strength of single-shear nail connections when subjected to lateral loading. Solid sawn lumber and laminated veneer lumber were used as framing members and two different thicknesses of both oriented strand board and plywood were used as the...
Resource Type:: Article

The effect of elevated temperature exposure on the fracture toughness of solid wood and structural wood composites

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 init) or a total energy to fracture (G f). These parameters provide incomplete fracture characterization for these materials because the toughness changes as the crack propagates. Thus,...
Resource Type:: Article

Numerical Simulation of Orthogonal Cutting Using the Material Point Method

Creator:: Nairn, John A.
Abstract:: A material point method simulation of orthogonal cutting that can simulate cutting into steady-state chip curling is described. The modeling used ductile fracture mechanics using cohesive zone in the cutting path. Robust simulations required a new mechanism to damp kinetic energy artifacts associated with dynamic crack propagation. The simulations displayed...
Resource Type:: Article

Crack propagation and fracture toughness of solid balsa used for cores of sandwich composites

Creator:: Mohammadi, Meisam Shir and Nairn, John A.
Abstract:: To better understand the suitability of balsa wood as a core material for sandwich composites, this paper presents a detailed study of the fracture properties of balsa. The experiments looked at mode I, mode II, and mixed-mode fracture with crack growth both parallel and perpendicular to the wood grain direction....
Resource Type:: Article

A new approach to the theory of linear dichroism in partially ordered systems. Application to reaction centers and whole cells of photosynthetic bacteria

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...
Resource Type:: Article

Direct calculation of the orientational distribution function of partially ordered ensembles from the EPR line shape

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

A general theory of the spectroscopic properties of partially ordered ensembles. I. One vector problems

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...
Resource Type:: Article

A general theory of the spectroscopic properties of partially ordered ensembles. II. Two‐vector problems

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...
Resource Type:: Article

Single photon timing system for picosecond fluorescence lifetime measurements

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...
Resource Type:: Article

Mechanical stability of ultrathin Ge/Si film on SiO2: The effect of Si/SiO2 interface

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...
Resource Type:: Article

A numerical study of the transverse modulus of wood as a function of grain orientation and properties

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...
Resource Type:: Article

The effect of elevated temperature exposure on the fracture toughness of solid wood and structural wood composites

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...
Resource Type:: Article

Generalized crack closure analysis for elements with arbitrarily-placed side nodes and consistent nodal forces

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...
Resource Type:: Article

ScholarsArchive@OSU

NairnJohnForestryDirectCalculationOrientational(Erratum).pdf

NairnJohnForestryDirectCalculationOrientational.pdf

Thermal degradation of bending strength of plywood and oriented strand board: a kinetics approach

Thermal Degradation of Lateral Yield Strength of Nailed Wood Connections

The effect of elevated temperature exposure on the fracture toughness of solid wood and structural wood composites

Numerical Simulation of Orthogonal Cutting Using the Material Point Method

Crack propagation and fracture toughness of solid balsa used for cores of sandwich composites

A new approach to the theory of linear dichroism in partially ordered systems. Application to reaction centers and whole cells of photosynthetic bacteria

Direct calculation of the orientational distribution function of partially ordered ensembles from the EPR line shape

A general theory of the spectroscopic properties of partially ordered ensembles. I. One vector problems

A general theory of the spectroscopic properties of partially ordered ensembles. II. Two‐vector problems

Single photon timing system for picosecond fluorescence lifetime measurements

Mechanical stability of ultrathin Ge/Si film on SiO2: The effect of Si/SiO2 interface

A numerical study of the transverse modulus of wood as a function of grain orientation and properties

The effect of elevated temperature exposure on the fracture toughness of solid wood and structural wood composites

Generalized crack closure analysis for elements with arbitrarily-placed side nodes and consistent nodal forces

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