Two important wood properties are the modulus of elasticity (MOE) and the modulus of rupture (MOR). In the past, the statistical distribution of the MOE has often been modeled as Gaussian, and that of the MOR as lognormal or as a twoor three-parameter Weibull distribution. It is well known that MOE and MOR are positively correlated. To model the simultaneous behavior of MOE and MOR for the purp...

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Two types of measurement are presented that relate molecular events to macroscopic behavior of F-actin networks. First, shear modulus is measured by oscillating an embedded microbead. Second, a microbead is translated at constant rate and transitions in the resisting force are observed. The loading rate dependence of the force at the transitions is similar to that of the molecular unbinding for...

During the past decade the southern pine industry has adopted technology for kilndrying dimension lumber at temperatures above the boiling point of water. Does exposure to such temperatures diminish the mechanical properties of southern pine? Previous research (Koch 1971) has indicated that when dried 21 hours at 240 F (100 F wet-bulb temperature) with crosscirculation air velocity of 1,(XX) £p...

Kennedy (1965) reported small clear strength values for most Canadian species. The average value for modulus of rupture for Douglas Fir based upon 1057 specimens was reported to be 7540 p. s. (52 026 kN/m2 ) when tested in the green (wet) condition while the average value for air-dried specimens adjusted to 12% moisture content was found to be 12,850 p.s.i. (88 665 kN/m2 ), an increase of 71%. ...

Cancer cell transformation is often accompanied by a modification of their viscoelastic properties. When capturing the stress-to-strain response of primary chronic myelogenous leukemia (CML) cells, from two data sets of CD34+ hematopoietic cells isolated from healthy and leukemic bone marrows, we show that the mean shear relaxation modulus increases upon cancer transformation. This stiffening o...

Accurate estimates of stress in an atherosclerotic lesion require knowledge of the material properties of its components (e.g., normal wall, fibrous plaque, calcified regions, lipid pools) that can only be approximated. This leads to considerable uncertainty in these computational predictions. A study was conducted to test the sensitivity of predicted levels of stress and strain to the paramete...

Finding alternative uses for raw material from small-diameter trees is a critical problem throughout the United States. In western states, a lack of markets for small-diameter ponderosa pine (Pinus ponderosa) and lodgepole pine (Pinus contorta) can contribute to problems associated with overstocking. To test the feasibility of producing structural composite lumber (SCL) beams from these two wes...