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You searched on: Author: andrew slifka

Displaying records 11 to 20 of 43 records.
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Published: 9/9/2012
Authors: Andrew J Slifka, Elizabeth S Drexler, Neha N. Rustagi, Damian S Lauria, Joseph David McColskey, Robert L Amaro
Abstract: Fatigue crack growth tests were conducted on two API 5L X52 pipeline steel alloys. One alloy was from a new linepipe that was installed for hydrogen service in 2011. The other alloy was from a vintage pipe that first saw natural gas service in 1964. ...

Published: 8/10/2012
Authors: Andrew J Slifka, Gurpreet Singh, Paul Rice, Damian S Lauria, Roop Mahajan
Abstract: We demonstrate the optical manipulation of a polystyrene bead in air attached to an individual carbon nanotube. In continuation of our previous work [1] we have also utilized this technique to demonstrate the calibration of a nanotube-sphere (NT-sphe ...

13. A review of fatigue crack growth for pipeline steels exposed to hydrogen
Published: 11/30/2010
Authors: Nicholas Nanninga, Andrew J Slifka, Yaakov Levy, Calvin L. White
Abstract: Hydrogen pipeline systems offer an economical means of storing and transporting energy in the form of hydrogen gas. Pipelines can be used to transport hydrogen that has been generated at solar and wind farms to and from salt cavern storage locations ...

14. Electrochemical measurement of diffusion in photopolymerized polyethylene glycol (PEG) hydrogels
Published: 10/29/2010
Authors: Kavita M Jeerage, Stephanie M. LaNasa, Holly A. Hughes, Damian S Lauria, Stephanie J. Bryant, Andrew J Slifka
Abstract: Scanning electrochemical microscopy has been used to examine the molecular transport properties of photopolymerized poly(ethylene glycol) (PEG) hydrogels having different mesh sizes. Both the molecular weight (508 Da or 3000 Da) of the PEG diacrylate ...

15. Multi-Scale Pore Morphology in Vapor-Deposited Yttria-Stabilized Zirconia Coatings
Published: 6/16/2010
Authors: Derek D. Hass, H. Zhao, Tabbetha A. Dobbins, Andrew John Allen, Andrew J Slifka, H. N.G. Wadley
Abstract: A high pressure, electron-beam directed-vapor deposition process has been used to deposit partially stabilized zirconia containing 7 % yttria by mass at deposition pressures of 7.5 Pa to 23 Pa. Anisotropic ultra-small-angle X-ray scattering (USAXS) w ...

16. Observations of Nanobubble Formation on Carbon Nanotubes
Published: 5/28/2010
Authors: Andrew J Slifka, Damian S Lauria, Gurpreet Singh, Roop L Mahajan
Abstract: We used an optical trap and a high-speed camera to image bubble initiation on the surface of multi-walled carbon nanotubes. The laser wavelength was 1064 nm and the average power was 100 mW. This is the first demonstration of bubble formation on in ...

17. Safety Considerations in Designing a Facility for Mechanical Property Measurements in High Pressure Gaseous Hydrogen Environments.
Published: 5/4/2010
Authors: Andrew J Slifka, Yaakov Levy, Nicholas Nanninga, Thomas A. (Thomas A.) Siewert, Joseph David McColskey
Abstract: N/A

18. A Uniaxial bioMEMS device for imaging single cell response during quantitative force-displacement measurements
Published: 12/1/2008
Authors: David Serrell, Jera Law, Andrew J Slifka, Roop L Mahajan, Dudley S. Finch
Abstract: Mechanical forces play a key role in many cellular processes such as apoptosis and differentiation. A microfabricated device has been developed for imaging of a single, adherent cell while quantifying force under an applied strain. The device works i ...

19. 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 ...

20. Spatially and Temporally Resolved Thermal Imaging of Cyclically Heated Interconnects by Use of Scanning Thermal Microscopy
Published: 1/1/2008
Authors: Nicholas Barbosa, Andrew J Slifka
Abstract: A scanning thermal microscope (SThM) was used to investigate the spatial and temporal distribution of temperature in electrical interconnect structures designed for measuring the mechanical properties of thin films. Knowledge of the thermal behavior ...

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