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  • 1995-1999  (2)
  • Hypresonic shock  (1)
  • poly(dimethyl-siloxane)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Radiation in a hypersonic shock layer generated around a projectile (1995)
    Springer
    Shock waves 5 (1995), S. 217-224 
    Details
    ISSN: 1432-2153
    Keywords: Hypresonic shock ; Radiation ; Ballistic range ; Nonequilibrium flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract Radiation emitted from the shock layer generated around a hypersonic flight model is experimentally investigated by using a ballistic range (two-stage light-gas gun). A polyethylene projectile of 1.2 cm in diameter is launched in this facility at the velocity of 5 km/sec (M=15), and the emission from the induced shock layer around the projectile is observed with a spectroscope. As a result, molecular band-spectra from NO and N2 are detected along with those from carboncontaining molecules. Total emission power is measured with a diode-type powermeter. In addition, dimension effect of the flight model is theoretically and numerically examined, and a scaling law on thermochemical structure of the shock layer is developed. It shows that the thickness of thermal boundary-layer formed on the model surface does not follow the conventional scaling law based on the reaction distance and on the energy relaxation distance. Finally, the radiative field around the projectile is numerically computed, and the total power emitted from the shock layer is estimated. From the comparison between computed and measured results, the validity of the calculation model is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419003
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Miscibility and gas permeability of poly(ethylene-co-5,4 mol^ 3,5,5-trimethylhexyl methacrylate)- polydimethyl-siloxane blends (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 86-90 
    Details
    ISSN: 1435-1536
    Keywords: Key words Poly(ethylene-co-5.4 mol% 3 ; 5 ; 5-trimethylhexyl methacrythlate) ; poly(dimethyl-siloxane) ; miscibility ; permeability ; dynamic elastic measurement ; DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Blends of poly(ethylene- co-5.4 mol% 3,5,5-trimethylhexyl methacrylate) (PE-TMHM) with poly(dimethylsiloxane) (PDMS) were prepared in the PDMS content range from 0 to 20%. The miscibility was studied for PE-TMHM–PDMS blends by DSC, dynamic mechanical and microscopic spectroscopy, and the gas permeability was measured for O2, N2 and CO2 as function of PDMS content. PE-TMHM and PDMS were partially miscible with each other below 20 wt% of PDMS content. The permeability coefficients (P) for O2, N2 and CO2 were increased by the blending of PDMS to PE-TMHM. The change of P for O2 with PDMS content well reflected the partially miscible phase separation behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050056
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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