Force and supporting particle image velocimetry measurements were performed on a plunging NACA 0012 airfoil at a Reynolds number of 10,000, at pre-stall, stall, and post-stall angles of attack. The lift coefficient for pre-stall and stall angles of attack at larger amplitudes showed abrupt bifurcations with the branch determined by initial conditions. With the frequency gradually increasing, ve...

We discuss waves created in relatively thick plates by edge excitation at frequency-thickness (fd) products that correspond, in principle, to multiple Lamb wave modes. For relatively low values of the fd product it is clear that Lamb wave modes will be generated, while at large values of the fd product we observe a bulk (longitudinal wave) in the solid, but influenced by reflections from the pl...

Many stimulus-detection systems are lateralized to allow for simultaneous comparison of paired stimuli. It has been hypothesized that the deeply forked tongue of snakes and some derived lizards functions as a chemical edge detector where cues gathered by each tine are kept separate to provide two points of lateral odor assessment by the central nervous system via vomeronasal input. While follow...

In a gas-liquid stirred reactor, gas tends to accumulate in low-pressure regions behind the impeller blades. Such gas accumulation forming so-called gas cavities, significantly alters impeller performance characteristics. We have computationally investigated gas-liquid flow generated by a Rushton turbine. Rotating Rushton turbine generates trailing vortices behind the blades, which enhance the ...

Patches of aggregated membrane proteins on motile fibroblasts are transported from the surfaces of the leading lamella to a site just ahead of the nucleus in the phenomenon known as capping. A major cell surface glycoprotein, Pgp-1 (GP80), was tagged with a monoclonal IgG and then aggregated with fluorescent secondary antibodies. Correlated digitized fluorescence and phase-contrast microscopy w...

Shallow injection, trailing shoe and band spreading machines were evaluated, in terms of their potential for reducing ammonia (NH3) emission, by making measurements after application and in direct comparison with surface broadcast applied cattle slurry (pig slurry on one occasion). Several sets of comparative measurements were made with each type of machine on both grassland and arable land (mo...

Retinal motion can modulate visual sensitivity. For instance, low contrast drifting waveforms (targets) can be easier to detect when abutting the leading edges of movement in adjacent high contrast waveforms (inducers), rather than the trailing edges. This target-inducer interaction is contingent on the adjacent waveforms being consistent with one another - in-phase as opposed to out-of-phase. ...

LONG BUNCHES M. Blaskiewicz , BNL 911B, Upton, NY 11973-5000, USA Abstract For long bunches, trailing edge multi-pacting causes the electron cloud density at the trailing edge of the bunch to be significantly larger than the cloud density during the early and central portions of the bunch. The effective wakefield is modeled and compared with hand estimates. Instabilty simulations, which include...

3D atom probe tomography (APT) is introduced as a powerful compositional and spatial analytical tool for SiGe nanostructures. Compositional analysis of SiGe structures demonstrates that the location and identity of Si, Ge and B atoms can be detected in three dimensions. Superior sensitivity at Si–SiGe–Si interfaces is specifically witnessed by both the quantification of Ge accumulation at an in...

This paper discusses a study of the effects of pylon trailing edge blowing on pusher propeller performance and noise emissions. Experimental investigations were performed in a low speed open jet wind tunnel, using a powered propeller model and a generic pylon model. A novel pylon blowing system was integrated in the aft part of the pylon to provide a uniform outflow. The numerical analysis was ...