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Author: elizabeth drexler

Displaying records 11 to 20 of 29 records.
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11. Dynamic Apparatus for the CTOA Measurement in Pipeline Steels
Published: 8/1/2008
Authors: Avigdor Shtechman, Christopher N McCowan, Roni Reuven, Elizabeth S Drexler, Philippe P. Darcis, John Matthew Treinen, R. Smith, J. Merritt, Thomas Allen Siewert, Joseph David McColskey
Abstract: When a crack initiates and propagates in a pressurized pipe the only thing that might stop this high-velocity event is the release of internal pressure (decompression) resulting in a deceleration in the crack-propagation rate. This deceleration can b ...

12. Stiffening of the Extrapulmonary Arteries in Chronic Hypoxic Pulmonary Hypertension
Published: 7/1/2008
Authors: Elizabeth S Drexler, J. E. Bischoff, Christopher N McCowan, Andrew J Slifka, Timothy P Quinn, Robin Shandas, Dunbar Ivy, K. R. Stenmark
Abstract: It is increasingly appreciated that changes in the compliance properties of large blood vessels are critical determinants of ventricular afterload and ultimately dysfunction. Little is known of the mechanical properties of large vessels in the settin ...

13. Interaction of environmental conditions: Role in the reliability of active implantable devices
Published: 6/7/2007
Authors: Elizabeth S Drexler, Andrew J Slifka, Nicholas Barbosa, John W. Drexler
Abstract: Present techniques for assessing the reliability of active implantable medical devices (AIMDs) rely on testing one or two environmental conditions at a time. But the interaction of these environmental conditions may have a greater impact on reliabili ...

14. Fracture Toughness through a Welded Pipeline Section - Crack Tip Opening Angle Criterion
Published: 4/23/2007
Authors: Philippe P. Darcis, Christopher N McCowan, Elizabeth S Drexler, Joseph David McColskey, Avigdor Shtechman, Thomas Allen Siewert
Abstract: The increasing demand for natural gas as an alternative energy source implies continued growth of gas pipeline installations. This trend compels the natural gas transmission industry to consider the construction of larger-diameter, higher-pressure pi ...

15. Stress-strain behavior of rat pulmonary arteries
Published: 1/1/2007
Authors: Elizabeth S Drexler, J Wright, Andrew J Slifka, Christopher N McCowan, Dunbar Ivy, Robin Shandas
Abstract: The stress-strain behavior of rat pulmonary arteries was studied using a bubble inflation technique. To obtain mechanical properties, an analytical method to evaluate the bubble test results was developed. A flat disk of rat pulmonary artery was cons ...

16. Report of Workshop on Measurement Methods for Evaluation of the Reliability of Active Implantable Medical Devices
Series: Special Publication (NIST SP)
Report Number: 1047
Published: 5/1/2006
Authors: Elizabeth S Drexler, W F Regnault, John A Tesk
Abstract: This report summarizes the activities of the Workshop on Measurement Methods for Evaluation of the Reliability of Active Implantable Medical Devices, held October 3 and 4, 2005 in Gaithersburg, MD. The two-day workshop brought together representative ...

17. Implementation and Application of a Microstructurally Based Orthotropic Hyperelastic Model of Pulmonary Artery Mechanics under Normotensive and Hypertensive Conditions
Published: 8/1/2005
Authors: Yang Zhang, Martin Dunn, Elizabeth S Drexler, Christopher N McCowan, Andrew J Slifka, Dunbar Ivy, Robin Shandas
Abstract: We implemented, validated, and applied a microstructurally based orthotropic hyperelastic constitutive model to simulate pulmonary artery mechanics under normotensive and hypoxic hypertensive conditions. The configuration of the model microstructure ...

18. Comparison of Strength Properties of Normotensive and Hypertensive Rat Pulmonary Arteries
Published: 10/1/2004
Authors: Elizabeth S Drexler, Christopher N McCowan, J Wright, Andrew J Slifka, Dunbar Ivy, Robin Shandas
Abstract: A series of tests were conducted to quantify the difference in the mechanical properties of normo-and hypertensive pulmonary arteries. A bubble-test design was emplpoyed to measure the biaxial properties of a segment of artery. The test results compa ...

19. Fracture Toughness Measurement of Chromium Nitride Films on Brass
Published: 7/1/2004
Authors: M Krishnamurthy, I Reimanis, J Berger, Elizabeth S Drexler
Abstract: Two methods of measureing the fracture toughness of films are critically examined using well-characterized films of CrN and Cr^d2^N approximately 6(mu)m in thickness bonded to brass. The first method invokes a model developed by Beuth and Klingbeil ...

20. An Experimental Method for Measuring Mechanical Properties of Rat Pulmonary Arteries Verified With Latex
Series: Journal of Research (NIST JRES)
Published: 6/1/2003
Authors: Elizabeth S Drexler, Andrew J Slifka, J Wright, Christopher N McCowan, Dudley Finch, Timothy P Quinn, J D McCloskey, Dunbar Ivy, Robin Shandas
Abstract: A study of the biomechanics and hemodynamics of pulmonary hypertension is incomplete without including mechanical properties data comparing healthy and diseased arterial tissue. In the initial stabe of this study, Sprague-Dawley rats will be induced ...

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