Search

Your search keyword '"Beifuss, U."' showing total 38 results
Start Over Author "Beifuss, U." Database Complementary Index
38 results on '"Beifuss, U."'

5. Application of Pressure-Sensitive Paint for Determination of Dynamic Surface Pressures on a 30 Hz Oscillating 2D Profile in Transonic Flow.

Author

Klein, C., Sachs, W. E., Henne, U., Egami, Y., Mai, H., Ondrus, V., and Beifuss, U.

Abstract

Visualization and measurements of aerodynamic effects on a 2D-wing-profile model were conducted using an optical pressure measurement system based on the pressure-sensitive paint (PSP) technique. The PSP technique can be used to obtain absolute pressure distributions on the surface of a model and in addition to evaluate quantitative aerodynamic flow phenomena e.g., shock location, shock-shock interaction, and shock boundary layer interaction, by using scientific grade cameras and image processing techniques. The PSP technique has been used here for investigations of periodic and unsteady flows. In a wind tunnel campaign in the DNW-TWG, a 2D-wing-profile model, which is pitch oscillating at up to 30 Hz, was investigated. The experiment presented here was performed at angles-of-attack α = 1.12° ± 0.6° at Ma = 0.72. With this work the area of application of PSP to dynamic systems where oscillating pressure changes of the order of 1000 Pa have to be measured at rates of up to 100 Hz is demonstrated. [ABSTRACT FROM AUTHOR]

Published
2010
Full Text
View/download PDF

8. Development of new two-component temperature-sensitive paint (TSP) for cryogenic testing.

Author

Egami, Y., Fey, U., Klein, C., Quest, J., Ondrus, V., and Beifuss, U.

Subjects
LOW temperature engineering, WIND tunnels, LAMINAR flow, TURBULENCE, AERODYNAMICS, MOLECULAR dynamics
Abstract

Two-component temperature-sensitive paint (TSP) for cryogenic wind tunnels has been newly developed to extend the highest working temperature up to 320 K, whereas a conventional single-component cryoTSP operates in the temperature range from 100 to 240 K. The two-component cryoTSP includes two luminophores: a ruthenium complex (Ru(trpy)2) and a europium complex, which are very temperature sensitive in the range of 100-240 K and 220-320 K, respectively. The ruthenium complex is excited by blue light while the europium complex requires UV light. One can thence operate the two luminophores independently by illuminating the paint at different wavelengths. Both luminophores emit red light, so that it is possible to use a single camera filter to observe both luminophores. Verification tests at different cryogenic wind tunnels proved that the two-component cryoTSP could detect a boundary layer transition line even up to room temperatures with only a single coating. This means that it is neither necessary to apply a different TSP coating to a model nor use an infrared camera when the wind tunnel is operated at room temperatures. As a result, the two-component cryoTSP enables one to save time and money in cryogenic testing. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
View/download PDF

9. Synthesis of new 1H-1,2,4-triazolylcoumarins and their antitumor and anti-HIV activities.

Author

Al-Soud, Y., Al-Masoudi, I., Saeed, B., Beifuß, U., and Al-Masoudi, N.

Subjects
BENZOPYRANS, ACETONITRILE, TONKA bean, RING formation (Chemistry), ANTICOAGULANTS
Abstract

A variety of 7-[(1,5-dialkyl-1H-1,2,4-triazolyl)methoxy(and methyl)]coumarins were synthesized from cycloaddition of 2-(2H-benzopyran-7-yloxy)acetonitrile and 2-(5-methoxy-4-methyl-2H-benzopyran-7-yloxy)acetonitrile, respectively, with various reactive cumulene [InlineMediaObject not available: see fulltext.] intermediates via spontaneous rearrangements. The anticancer (breast, lung, CNS cancers) and antiviral (HIV-1, HIV-2) properties of some compounds were investigated in vitro. 5-Methoxy-4-methyl-7-[(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[1,5-a]azepin-2-yl)methyl]coumarin showed some inhibition of HIV-1. [ABSTRACT FROM AUTHOR]

Published
2006
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results