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  • AERODYNAMICS  (7)
  • ASTROPHYSICS  (6)
  • Polymer and Materials Science  (4)
  • ACOUSTICS  (3)
  • 1975-1979  (20)
  • 1
    Electronic Resource
    Electronic Resource
    The viscometric behavior of native and relaxed closed circular PM2 DNAs at intermediate and high ethidium bromide concentrations (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 1343-1356 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have measured the specific viscosity of closed circular PM2 DNA in the presence of concentrations of ethidium bromide ranging up to 5 mg/ml. Both native viral PM2 DNA I and enzymatically prepared relaxed, closed circular PM2 DNA I0 exhibit a complex dependence of the specific viscosity upon the extent of supercoiling. As the number of superhelical turns is increased in the positive sense from zero, the viscosity first decreases to a minimum, then passes through a secondary maximum, and eventually again increases as the dye-induced duplex unwinding proceeds. In the case of DNA I, a corresponding behavior is mirrored in the negative sense as dye is removed from the principal viscometric maximum (complete relaxation of the DNA by dye). The shape of the curve relating specific viscosity to extent to supercoiling is similar for superhelical DNAs of either handedness, a result which we interpret to mean that the influence of any regions of special secondary structure (such as denatured loops) upon the viscosity is minimal. At very high dye concentrations the specific viscosity decreases dramatically. This effect might arise either from intermolecular aggregation or from a dye-induced collapse in the DNA secondary structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160614
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rheological and other physical characteristics of polysaccharides from two black yeast-like fungi (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 701-710 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Two black yeast polysaccharides show similar non-Newtonian behavior when the effects of polysaccharide concentration, shear rate, pH, salt, and temperature on the viscosity of dispersions are examined. Both polysaccharides readily form viscous aqueous dispersions and can be cast into flexible films, and both stabilize oil-water emulsions. Each of these two polysaccharides occurs extracellularly in the culture fluids of two different black yeast-like fungi - Rhinocladiella elatior Mangenot (strain NRRL YB-4163) and Rhinocladiella mansonii (Castellani) Schol-Schwarz (strain NRRL Y-6272). This report appears to be the first on the rheology of an extracellular polysaccharide which contains the unusual sugar N-acetyl-D-glucosaminuronic acid.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220310
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comments on the structure of low molecular weight butene polymers prepared by cationic polymerization (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 1173-1174 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160527
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Entropy elasticity in poly(2-hydroxyethyl methacrylate) gels (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 15 (1977), S. 733-738 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.130151205
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  • 5
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    Evidence for a 17d periodicity from Cyg X-3 (1976)
    In:  CASI
    Details
    Publication Date: 2006-04-18
    Description: Data which indicate a periodicity of 17d from Cyg X-3 are reviewed. The data are taken from the Ariel 5 satellite All-Sky Monitor and the Sky Survey Experiment.
    Keywords: ASTROPHYSICS
    Type: X-ray Binaries; p 245-253
    Format: text
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  • 6
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    Wall cooling effects on hypersonic transitional/turbulent boundary layers at high Reynolds numbers (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The characteristics of a thick hypersonic boundary layer turbulent for a length of 175 cm on a 4 deg sharp wedge were measured. The resulting boundary layer was free from transverse curvature effects and only mildly affected by upstream history effects caused by pressure and wall temperature gradients. Heat-transfer distributions were used to locate regions of laminar, transitional, and turbulent flow at an edge unit Reynolds number of 470,000 cm at wall-to-total temperature ratios from about 0.3 to 1. Wall cooling had little effect on the location of the transition region. Pitot and total temperature profiles and skin-friction measurements were obtained at several locations along the model longitudinal centerline. Mixing length and turbulent Prandtl number distributions were derived from the fully turbulent mean profiles.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 15; Oct. 197
    Format: text
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  • 7
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    Mach and Reynolds number effects on turbulent skin friction reduction by injection (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The investigation reported is concerned with questions regarding a possible Mach number influence on skin friction reduction caused by injection. The investigation shows that data considered by Danberg (1967) for the no-blowing skin friction coefficient are in error. Accurate profiles and local skin friction coefficient values are obtained when the influence of low Reynolds number amplification in the outer region of the boundary layer is included in a calculation method.
    Keywords: AERODYNAMICS
    Type: Journal of Spacecraft and Rockets; 12; Aug. 197
    Format: text
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  • 8
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    Evidence for a 17-d periodicity from Cyg X-3 (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Data are presented from the Ariel-V All-Sky Monitor which indicate a 17-day periodicity of the X-ray spectra from Cyg X-3 (3U2030+40). The data are consistent with data from the Ariel V Sky Survey Experiment. Assuming that the high intensity state of Cyg X-3 is well fitted by a structureless black body (Serlemitsos et al., 1975), and that the 17-day maxima correspond to increased electron scattering in the source, it is suggested that the 17-day effect is analogous to the 35-day variation in Her X-1. The possible explanation of this phenomenon as a result of the 17-day orbital period of the binary system containing Cyg X-3 is severely constrained by the stability of the well-known 4.8-hour variation.
    Keywords: ASTROPHYSICS
    Type: Nature; 260; Apr. 15
    Format: text
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  • 9
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    Generalized velocities in the outer region of hypersonic turbulent boundary layers (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An attempt is made to show that the outer portion of the velocity profile of hypersonic turbulent boundary layers can be transformed so that the constants determined by a best fit to the law of the wake are in reasonable agreement with the wake constant for incompressible boundary layers at the same Reynolds number. Both y transformations (where y is distance from the surface) and velocity transformations produce velocity profiles which, with the proper choice of wall shear stress to give shear velocity, can be reduced to the incompressible law of the wall.
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 17; Aug. 197
    Format: text
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  • 10
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    An analysis of prop-fan/airframe aerodynamic integration (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approach to aerodynamic integration of turboprops and airframes, with emphasis placed upon wing mounted installations is addressed. Potential flow analytical techniques were employed to study aerodynamic integration of the prop fan propulsion concept with advanced, subsonic, commercial transport airframes. Three basic configurations were defined and analyzed: wing mounted prop fan at a cruise Mach number of 0.8, wing mounted prop fan in a low speed configuration, and aft mounted prop fan at a cruise Mach number of 0.8.
    Keywords: AERODYNAMICS
    Type: NASA-CR-152186 , NAS 1.26:152186 , D6-47113
    Format: application/pdf
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