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You searched on: Author: andrew slifka

Displaying records 31 to 40 of 47 records.
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31. 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 ...

32. 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 ...

33. 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 ...

34. 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 ...

35. Thermal Conductivity Measurement of an Electron-Beam Physical Vapor-Deposition-Coating
Series: Journal of Research (NIST JRES)
Published: 4/1/2003
Authors: Andrew J Slifka, Bernard J Filla
Abstract: An industrial thermal-barrier coating designated PWA 266, processed by electron-beam physical-vapor deposition, was measured using a steady-state thermal conductivity technique. The thermal conductivity of the 7%, by mass, yttria-stabilized zirconia ...

36. Thermal Evaluation of Scorched Graphite-Epoxy Panels by Infrared Scanning
Series: Journal of Research (NIST JRES)
Published: 3/1/2003
Authors: Andrew J Slifka, T Hall, E S Boltz
Abstract: A simple measurement system is described for evaluating damage to graphite-dpoxy panels, such as are used in high-performance aircraft. The system uses a heating laser and infrared imaging system to measure thermal performance. thermal conductivity ...

37. Apparent Mobility of Interfaces in Integral Resistor Material
Published: 1/1/2003
Authors: Andrew J Slifka, John W. Drexler
Abstract: Measurements were made on an integral resistor sample that showed apparent interfacial mobility. Initial measurements were made using infrared, optical, and scanning electron microscopies. Analysis of infrared microscopy measurements showed a broad ...

38. Thermomechanical Effects in Embedded Passive Materials
Published: 4/1/2002
Authors: Andrew J Slifka, Elizabeth S Drexler
Abstract: Thermomechanical fatigue was measured using electron-beam moire (EBM) and infrared (IR) microscopy. A specimen was made using FR-4 printed wiring board, (PWB), a silver-filled conductive adhesive, and a carbon-filled conductive paste. Both filled p ...

39. Characterization of Interfaces Involving Electrically Conductive Adhesives Using Electron-Beam Moire and Infrared Microscopy
Published: 3/1/2002
Authors: Andrew J Slifka, Elizabeth S Drexler
Abstract: The complimentary techniques of electron-beam moire and infrared microscopy were used to determine the mechanical and thermal degradation of interfaces involving electrically conductive adhesives. The infrared microscopy technique was used to examin ...

40. Low Thermal Conductivity Vapor Deposited Zirconia Microstructures
Published: 4/1/2001
Authors: D D Hass, Andrew J Slifka, H N Wadley
Abstract: Low thermal conductivity yttria stabilized zirconia (YSZ) coatings have been grown using a low vacuum (0.20 Torr) electron beam directed vapor deposition process. In this approach, a transsonic helium jet was used to entrain and transport an evapora ...

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