Considerations upon the fixation of the limits between the species and the variety, founded upon the study of the European and Mediterranean species of the hymenopterous genus Polistes ( Latr. )

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Interaction of droplet clouds with swirling flows

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76440/1/AIAA-1989-159-598.pd

Experiments on shock induced combustion of isolated regions of hydrogen-oxygen mixtures

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77323/1/AIAA-1999-821-387.pd

Experimental study of the mixing of reactive gases at their interface behind a shock wave

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77082/1/AIAA-1998-2507-235.pd

Effect of the boundary layer upon the flow in a conical hypersonic nozzle

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76641/1/AIAA-2269-288.pd

Fluid-assisted grain size reduction leads to strain localization in oceanic transform faults

Oceanic Transform Faults are major plate boundaries representing the most seismogenic part of the mid ocean ridge system. Nonetheless, their structure and deformation mechanisms at depth are largely unknown due to rare exposures of deep sections. Here we study the mineral fabric of deformed mantle peridotites - ultramafic mylonites - collected from the transpressive Atobá ridge, along the northern fault of the St. Paul transform system in the Equatorial Atlantic Ocean. We show that, at pressure and temperature conditions of the lower oceanic lithosphere, the dominant deformation mechanism is fluid-assisted dissolution-precipitation creep. Grain size reduction during deformation is enhanced by dissolution of coarser pyroxene grains in presence of fluid and contextual precipitation of small interstitial ones, leading to strain localization at lower stresses than dislocation creep. This mechanism potentially represents the dominant weakening factor in the oceanic lithosphere and a main driver for the onset and maintenance of oceanic transform faults

Boundary-layer effects on the reflection of sound waves and weak shock waves at shallow incidence

When either a plane acoustic wave or a weak shock wave is incident upon an infinite wall, the boundary-layer correction to the reflected wave becomes large if the angle between the wave front and the normal to the wall approaches zero. It is shown that transformation to moving coordinates leads to transonic flow problems whose solution permits removal of the singular behavior in each of these cases. Wenn eine ebene Schallwelle oder ein schwacher Stoss so auf eine Wand auftrifft, dass der Winkel zwischen der Wellenfront und der Wandnormalen gegen Null geht, so wird die Korrektur der reflektierten Welle wegen der Wandgrenzschicht gross. In der vorliegenden Arbeit wird gezeigt, dass eine Transformation auf bewegte Koordinaten auf ein transonisches Problem führt, dessen Lösung die Singularität in beiden Fällen vermeidet.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43361/1/33_2005_Article_BF01603823.pd