Study of vortex boundary layer interactions Final report, period ending 26 Jun. 1966

Vortex-boundary layer interaction, and turbulent pipeflow at very low speed

A sensitive magnetic balance for the direct measurement of skin friction drag

Sensitive magnetic balance for direct measurement of skin friction dra

Study of the mechanics of non-Newtonian fluids Final report, 26 Jun. 1963 - 26 Dec. 1968

Aspects of mechanics of nonNewtonian fluid

Effects of spiral longitudinal vortices on turbulent boundary layer skin friction

Effect of spiral longitudinal vortices on turbulent boundary layer skin frictio

Effects of periodic blowing through flush transverse slots on turbulent boundary layer skin friction

Effects of periodic blowing through flush transverse slots on turbulent boundary layer skin frictio

Magnetoresistance of n-GaAs at filamentary current flow

A large number of sharp structures are observed in the 4.2 K magnetoresistance of n-GaAs biased above impurity breakdown in a regime where current flow is filamentary. Most of the structures cannot be attributed to spectral properties of the semiconductor such as impact excitation of shallow donors or the magnetoimpurity effect. Experimental results give evidence that these structures are caused by a redistribution of the filamentary current flow when one filament border is swept across an imperfection in the material

Ursinus College Bulletin Vol. 18, No. 4, January 15, 1902

A digitized copy of the January 15, 1902 Ursinus College Bulletin.https://digitalcommons.ursinus.edu/ucbulletin/1194/thumbnail.jp

Root Weevils

NYS IPM Type: Fruits IPM Fact SheetThere are more than 20 species of root weevils that attack strawberry in the United States. In New York, the three major species are the black vine weevil, Otiorhynchus sulcatus (Fabricius), the strawberry root weevil, 0. ovatus L., and the rough strawberry weevil, 0. rugostriatus Goeze. Root weevils are also pests of raspberries and rhododendrons

Characterization of soil and postlaunch pad debris from Cape Canaveral launch complex and analysis of soil interaction with aqueous HCl

Soil samples were fractionated and analyzed in order to assess the physical and chemical interactions of entrained soil with solid-rocket exhaust clouds. The sandy soil consisted primarily of quartz (silica) particles, 30 to 500 microns in diameter, and also contained seashell fragments. Differential and cumulative soil-mass size distributions are presented along with mineralogy, elemental compositions, and solution pH histories. About 90 percent of the soil mass consisted of particles 165 microns in diameter. Characteristic reaction times in aqueous HC1 slurries varied from a few minutes to several days, and capacities for reaction under acidic conditions varied from 10 to 40 g HCl/kg soil, depending on particle size. Airborne lifetimes of particles 165 microns are conservatively 30 min, and this major grouping is predicted to represent a small short-term chemical sink for up to 5% of the total HC1. The smaller and more minor fractions, below a 165 micron diameter, may act as giant cloud condensation nuclei over much longer airborne lifetimes. Finally, the demonstrated time dependency of neutralization is a complicating factor; it can influence the ability to deduce in-cloud HCl scavenging with reaction and can affect the accuracy of measured chemical compositions of near-field wet deposition

Assessment of a wake vortex flight test program

A proposed flight test program to measure the characteristics of wake vortices behind a T-33 aircraft was investigated. A number of facets of the flight tests were examined to define the parameters to be measured, the anticipated vortex characteristics, the mutual interference between the probe aircraft and the wake, the response of certain instruments to be used in obtaining measurements, the effect of condensation on the wake vortices, and methods of data reduction. Recommendations made as a result of the investigation are presented