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You searched on: Author: timothy quinn Sorted by: title

Displaying records 1 to 10 of 28 records.
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1. Investigations into the potential contribution of a thermal mechanism for pulsed-high intensity focused ultrasound mediated delivery
Published: 12/3/2007
Authors: Brian E. O'Neill, Howard Vo, Mary Angstadt, Victor Frenkel, Bradford Wood, Timothy P Quinn
Abstract: The mechanism behind pulsed high intensity focused ultrasound (pHIFU) effects leading to increased drug delivery are currently poorly understood. In this work, the thermal dose and peak temperatures associated with a typical pHIFU treatment were meas ...

Published: 6/29/2007
Authors: Brian E. O'Neill, Timothy P Quinn, Victor Frenkel, King C. Li
Abstract: A biphasic model of soft tissue has been combined with a simple confined compression test to measure the hydraulic conductivity of soft tissues. The biphasic model treated the tissue as a mixture of an incompressible fluid and porous elastic solid. ...

3. A Coupled Arc and Droplet Model of GMAW
Published: 1/8/2005
Authors: Timothy P Quinn, M Szanto, T Gilad, I Shai
Abstract: A model of gas metal arc welding was developed that solves the magneto-hydrodynamic equations for the flow and temperature fields of the molten electrode and the plasma simultaneously, to form a fully coupled model. A commercial finite element code ...

4. A Mathematical Model of Wire Feeding Mechanisms in GMAW
Published: 7/1/2003
Authors: T M Padilla, D. R. Munoz, Timothy P Quinn, R. A. Rorrer
Abstract: A Hertzian based contact model of the friction between the welding wire and the wire liner has been developed to predict the wire pulling force for gas metal arc welding (GMAW). The model predicts a 2.5:1exponential increase in wire pulling force as ...

5. A Multi-Phasic Continuum Damage Mechanics Model of Mechanically Induced Increased Permeability in Tissues
Published: 12/30/2005
Authors: Brian O'Neill, Timothy P Quinn, Victor F. Frankel, King C. Li
Abstract: Recently, we have reported enhanced permeability of tissues due to in vivo treatment with pulsed high intensity focused ultrasound (pHIFU). This new therapy has shown promise as a way of increasing the penetration of large drug molecules both out of ...

6. A Welding Cell That Supports Remote Collaboration
Published: 9/30/1999
Authors: James D Gilsinn, William G Rippey, Joseph A Falco, Timothy P Quinn, Robert Russell, Keith A Stouffer
Abstract: Discrete part manufacturers using robotic arc welding cells often have several more geographically distributed plants than welding experts. This ratio often leads to costly downtimes due to both logistic and communication deficiencies between weld ...

7. A Welding Cell With Its Own Web Site
Published: 1/1/2000
Author: Timothy P Quinn
Abstract: Communications technology is allowing welding engineers to interact in the operation of a welding cell from a distance, as if they were physically present. The remote engineer can look at the weld, watch the robot motion, read front panel displays a ...

8. 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 ...

9. An instrumented bioreactor for mechanical stimulation and real-time, nondestructive evaluation of engineered cartilage tissue
Published: 6/1/2012
Authors: Jenni R. Popp, Justine Roberts, Douglas V Gallagher, Kristi S Anseth, Stephanie Bryant, Timothy P Quinn
Abstract: Mechanical stimulation is essential for chondrocyte metabolism and cartilage matrix deposition. In vitro, mechanical stimulation is accomplished via culture in a bioreactor. Traditional methods for evaluating the developing tissue are destructive ...

10. Constitutive Models for a Poly(e-caprolactone) Scaffold
Published: 10/1/2004
Authors: Timothy P Quinn, Tammy L. Oreskovic, Christopher N McCowan, N Washburn
Abstract: We investigate material models for a porous, polymeric scaffold used for bone. The material was made by co-extruding poly (e-caprolactone) (PCL), a biodegradable polyester, and poly(ethylene oxide)(PEO). The water soluble PEO was removed resulting in ...

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  • SP 250-XX: Calibration Services
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