Fan noise prediction assessment

This report is an evaluation of two techniques for predicting the fan noise radiation from engine nacelles. The first is a relatively computational intensive finite element technique. The code is named ARC, an abbreviation of Acoustic Radiation Code, and was developed by Eversman. This is actually a suite of software that first generates a grid around the nacelle, then solves for the potential flowfield, and finally solves the acoustic radiation problem. The second approach is an analytical technique requiring minimal computational effort. This is termed the cutoff ratio technique and was developed by Rice. Details of the duct geometry, such as the hub-to-tip ratio and Mach number of the flow in the duct, and modal content of the duct noise are required for proper prediction

Cloning and expression of a novel human profilin variant, profilin II

AbstractWe have isolated a 1.7 kbp cDNA encoding a 140 amino acid protein (15.1 kDa, pI 5.91) with a high sequence similarity (62%) to human profilin (profilin I). We have termed this variant profilin II. Northern blot analysis showed that profilin II is highly expressed in brain, skeletal muscle and kidney and less strongly in heart, placenta, lung and liver. In addition, three different transcript lengths were detected. Only one transcript of profilin I was found. The expression level of this was low in brain and skeletal muscle, medium in heart and high in placenta, lung, liver and kidney

Breeding for genetic resistance to Salmonella in pigs

Previous experimental Salmonella infection studies in Denmark have shown that some pigs remain faecal culture negative and seronegative despite oral inoculation with 10 c.f.u. S. Typhimunum and housing in highly contaminated pens, suggesting that some pigs are genetically resistant to Salmonella. Our study tested the following hypothesis: The Salmonella-negative status in certain pigs is due to genetic resistance, related to a single gene The resistance gene was supposed to have a low frequency and to be recessive and that full resistance only would appear if both alleles were recessive

Spectroscopic Applications of the (p,pi-) Reaction

This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440