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2013

Vincent, Gregory, Rogers, Robert, Spray, John, Schneider, Markus, Hogan, James

Velocity and size measurements of ejecta derived from impacts of railgun-launched projectiles into 10 mm thick gabbro tiles are examined. Fragmentation of the target and the ejecta velocity field are found to be governed by Hertzian fracture and the transfer of kinetic energy to the target. Over...

2013

Castillo, Josemar, Rogers, Robert J., Rawle, Alan, Spray, John, Hogan, James

The dynamic fragmentation of gabbro and granitoid tiles, and coarser and finer grained granitoid blocks have been examined for impact energies of 21–6180 J. Intra-grain fragmentation and inter-granular frictional melting were observed to be common features of the fragmentation process....

2013

Hogan, James, Schneider, Markus, Rogers, Robert, Spray, John, Vincent, Gregory

The dynamic fragmentation of coarse and fine grained granitoid blocks during impact has been examined for energies of 1.9 kJ to 3.0 kJ and 2.7 kJ to 6.8 kJ, respectively. A particle tracking algorithm was developed to measure ejecta size and velocity at the rear of the target for a horizontal...

2013

Carey, Jason P., Melenka, Garrett W., Nobes, David S., Major, Paul W.

Archwire rotation is used in orthodontic treatment to alter the labiolingual orientation of a tooth. Measurement of the 3-dimensional (3D) motion of the orthodontic brackets requires a new configuration of the orthodontic torque simulator. The orthodontic torque simulator was coupled with a...

2013

Rogers, Robert, Spray, John, Hogan, James

The dynamic fragmentation of planetary materials during impact into finite targets has been examined. A particle tracking algorithm was implemented to estimate the size and velocity of fragments ejected from the rear of the target. A total of 76 experiments were performed for four material,...

2013

Lagravère, Manuel O., Carey, Jason P., DeCesare, Alessandro, Secanell, Marc

The purpose of this study is to minimize errors that occur when using a four vs six landmark superimpositioning method in the cranial base to define the co-ordinate system. Cone beam CT volumetric data from ten patients were used for this study. Co-ordinate system transformations were performed....

2013

Adeeb, Samer, El-Rich, Marwan, Lewicke, Justin, Carey, Jason P., Schofield, Jonathon, Parent, Eric

Sit-to-stand transfer (STS) is a common yet critical prerequisite for many daily tasks. Literature conducted on healthy STS often assume the body to behave symmetrically across the left and right side; yet only a few studies have been conducted to investigate this supposition. These studies have...

2013

Major, Paul W., Melenka, Garrett W., Nobes, David S., Carey, Jason P.

The design and testing of an orthodontic torque simulator that reproduces the effect of archwire rotation on orthodontic brackets is described. This unique device is capable of simultaneously measuring the deformation and loads applied to an orthodontic bracket due to archwire rotation. Archwire...

2013-09-19

Schofield, Jonathon S., Dawson, Michael R., Melenka, Garrett W., Carey, Jason P.

Purpose: This paper evaluates the material properties and dimensional accuracy of a MakerBot Replicator II desktop 3D printer. Design Methodology: A design of experiments (DOE) test protocol was applied to determine the effect of the following variables on the material properties of 3D printed...

2013-01-01

Flynn, M.R., Rosales, R.R., Kasimov, A. R., Seibold, B.

Fundamental diagrams of vehicular traffic flow are generally multi-valued in the congested flow regime. We show that such set-valued fundamental diagrams can be constructed systematically from simple second order macroscopic traffic models, such as the classical Payne-Whitham model or the...