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You searched on: Author: andrew slifka

Displaying records 21 to 30 of 43 records.
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21. 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 ...

22. Electrochemical measurements of diffusion through cardiac muscle tissue engineering scaffolds
Published: 5/18/2007
Authors: Kavita M Jeerage, Stephanie M. LaNasa, Damian S Lauria, Stephanie J. Bryant, Andrew J Slifka
Abstract: Cardiomyocytes, the beating cells of the heart, are highly dependent on oxygen for survival and function. Early work in cardiac muscle tissue engineering revealed that cardiomyocytes only survived within 150 microns of the scaffold's edge due to limi ...

23. A Uniaxial BioMEMS Device for Quantitative Force-Displacement Measurements
Published: 4/3/2007
Authors: David Serrell, Tammy L. Oreskovic, Andrew J Slifka, Roop L Mahajan, Dudley Finch
Abstract: There is a need for experimental techniques that allow the simultaneous imaging of cellular cystoskeletal components with quantitative force measurements on single cells. A bioMEMS device has been developed for the application of strain to a single c ...

24. Strain-Induced Grain Growth during Rapid Thermal Cycling of Aluminum Interconnects
Published: 1/1/2007
Authors: Robert R Keller, Roy H. Geiss, Nicholas Barbosa, Andrew J Slifka, David Thomas Read
Abstract: We demonstrate by use of automated electron backscatter diffraction (EBSD) the rapid growth of grains in non-passivated, sputtered Al-1Si interconnects during 200 Hz thermal cycling induced by alternating electric current. Mean grain diameters were o ...

25. 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 ...

26. Electrical Methods for Mechanical Characterization of Interconnect Thin Films
Published: 9/1/2005
Authors: Robert R Keller, Cynthia A. Volkert, Roy H. Geiss, Andrew J Slifka, David Thomas Read, Nicholas Barbosa, Reiner Monig
Abstract: We describe the use of electrical methods for evaluating mechanical reliability and properties of patterned copper and aluminum interconnects on silicon substrates. The approach makes use of controlled Joule heating, which causes thermal strains in t ...

27. 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 ...

28. 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 ...

29. Static and Quasi-static Calibration of Bio-MEMS Device
Published: 10/1/2004
Authors: Andrew J Slifka, Hrishikesh V. Panchawagh, Roop L Mahajan, Dudley Finch, R. A. Rorrer
Abstract: A bio-MEMS device which has been designed to stimulate cells by oscillatory actuation in the vertical direction has been calibrated. The displacement of this device was determined experimentally by a laser interferometer when actuated by a static vol ...

30. 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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