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2011

Nabih, Aliaa, Janssen, Meaghan, Kawchuk, Gregory N., Moussa, Walied, Carey, Jason P.

Back pain is a prevalent condition affecting much of the population at one time or the other. Complications, including neurological ones, can result from missed or mismanaged spinal abnormalities. These complications often result in serious patient injury and require more medical treatment....

2012

Fahimi, Farbod, Dawson, Michael R., Carey, Jason P.

The objective of above-elbow myoelectric prostheses is to reestablish the functionality of missing limbs and increase the quality of life of amputees. By using electromyography (EMG) electrodes attached to the surface of the skin, amputees are able to control motors in myoelectric prostheses by...

2012

Hogan, James, Spray, John, Rogers, Robert, Boonsue, Suporn

The dynamic fragmentation of granite at impact energies of 6–28 J is examined in this paper. Results indicate that more dense materials, or those with a higher quartz content, produce less fractured mass, and have larger dominant fragment sizes and smaller aspect ratios in their fragment...

2012

Boonsue, Suporn, Rogers, Robert, Spray, John, Hogan, James

The role of plastic deformation and fracture during small-scale, low-rate contact scenarios in gypsum is investigated. Results indicate that the hardness decreases with increasing load, on all axes, ranging from 216 kg/mm2 at 0.25 N to 91 kg/mm2 at 4.91 N on the (010) plane and from 122 kg/mm2 at...

2012

Tan, A.W. , Ungarish, M., Flynn, M.R.

We consider the propagation of a gravity current of density ρ c at the bottom of a two-layer stratified ambient in a horizontal channel of height H, in the high-Reynolds number Boussinesq domain. The study emphasizes theoretical-analytical modeling, however, experimental and Navier-Stokes...

2013

Craster, R. V., Flynn, M.R., Bhattacharya, S.

By adapting the Föppl-von Kàrmàn equation, which describes the deformation of a thin elastic membrane, we present an analysis of the buckling pattern of a thin, very viscous fluid layer subject to shear in an axisymmetric geometry. A linear stability analysis yields a differential eigenvalue...

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

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

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...

2013-09-19

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...