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Articles 1 - 3 of 3
Full-Text Articles in Mechanical Engineering
Apparatus For Removal Of Minute Particles From A Surface Using Thermophoresis To Prevent Particle Redeposition, Susan Davis Allen
Apparatus For Removal Of Minute Particles From A Surface Using Thermophoresis To Prevent Particle Redeposition, Susan Davis Allen
Mechanical Engineering - Daytona Beach
A method and apparatus for removing minute particles from a surface of a sample are provided that prevent redeposition of the particles onto the surface. By combining thermophoresis with laser assisted particle removal (LAPR), the methods and apparatus remove minute particles (for example, micrometer and nanometer sizes) and assure that they will not redeposit.
Derivation And Application Of A Conserved Orbital Energy For The Inverted Pendulum Bipedal Walking Model, Jerry E. Pratt, Sergey V. Drakunov
Derivation And Application Of A Conserved Orbital Energy For The Inverted Pendulum Bipedal Walking Model, Jerry E. Pratt, Sergey V. Drakunov
Publications
We present an analysis of a point mass, point foot, planar inverted pendulum model for bipedal walking. Using this model, we derive expressions for a conserved quantity, the “Orbital Energy”, given a smooth Center of Mass trajectory. Given a closed form Center of Mass Trajectory, the equation for the Orbital Energy is a closed form expression except for an integral term, which we show to be the first moment of area under the Center of Mass path. Hence, given a Center of Mass trajectory, it is straightforward and computationally simple to compute phase portraits for the system. In fact, for …
Nanosecond Near-Spinodal Homogeneous Boiling Of Water Superheated By Pulsed Co/Sub 2/ Laser, Sergey I. Kudryashov, Kevin Lyon, Susan D. Allen
Nanosecond Near-Spinodal Homogeneous Boiling Of Water Superheated By Pulsed Co/Sub 2/ Laser, Sergey I. Kudryashov, Kevin Lyon, Susan D. Allen
Mechanical Engineering - Daytona Beach
The fast boiling dynamics of superheated surface layers of bulk water cavitating under near-spinodal conditions during nanosecond C O2 laser heating pulses was studied using contact broad-band photoacoustic spectroscopy. Characteristic pressure-tension cycles recorded by an acoustic transducer at different incident laser fluences represent (a) weak random oscillations of transient nanometer-sized near-critical bubbles-precursors and (b) well-defined stimulated oscillations of micron-sized supercritical bubbles and their submicrosecond coalescence products. These findings provide an important insight into basic thermodynamic parameters, spatial and temporal scales of bubble nucleation during explosive liquid/vapor transformations in absorbing liquids ablated by short laser pulses in the thermal confinement regime. …