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  • 1
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    Crustal-scale balanced cross sections through the Variscan fold belt, Germany: the central EGT-segment (1991)
    In:  Tectonophysics 196: 1-21
    Details
    Publication Date: 1991
    Keywords: DEKORP 2, EGT,geological interpretation
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    CITATION DEKORP
  • 2
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    Crystallization of Hard Sphere Colloids in Microgravity: Results of the Colloidal Disorder-Order Transition, CDOT on USML-2 (1998)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Classical hard spheres have long served as a paradigm for our understanding of the structure of liquids, crystals, and glasses and the transitions between these phases. Ground-based experiments have demonstrated that suspensions of uniform polymer colloids are near-ideal physical realizations of hard spheres. However, gravity appears to play a significant and unexpected role in the formation and structure of these colloidal crystals. In the microgravity environment of the Space Shuttle, crystals grow purely via random stacking of hexagonal close-packed planes, lacking any of the face-centered cubic (FCC) component evident in crystals grown in 1 g beyond melting and allowed some time to settle. Gravity also masks 33-539 the natural growth instabilities of the hard sphere crystals which exhibit striking dendritic arms when grown in microgravity. Finally, high volume fraction "glass" samples which fail to crystallize after more than a year in 1 g begin nucleation after several days and fully crystallize in less than 2 weeks on the Space Shuttle.
    Keywords: Materials Processing
    Type: Second United States Microgravity Laboratory: One Year Report; Volume 2; 537-547; NASA/TM-1998-208697/VOL 2
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Physics of Hard Sphere Experiment: Scattering, Rheology and Microscopy Study of Colloidal Particles (2002)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Physics of Hard Sphere Experiment has two incarnations: the first as a scattering and rheology experiment on STS-83 and STS-94 and the second as a microscopy experiment to be performed in the future on LMM on the space station. Here we describe some of the quantitative and qualitative results from previous flights on the dynamics of crystallization in microgravity and especially the observed interaction of growing crystallites in the coexistance regime. To clarify rheological measurements we also present ground based experiments on the low shear rate viscosity and diffusion coefficient of several hard sphere experiments at high volume fraction. We also show how these experiments will be performed with confocal microscopy and laser tweezers in our lab and as preparation for the phAse II experiments on LMM. One of the main aims of the microscopy study will be the control of colloidal samples using an array of applied fields with an eye toward colloidal architectures. Temperature gradients, electric field gradients, laser tweezers and a variety of switchable imposed surface patterns are used toward this control.
    Keywords: Space Processing
    Type: Sixth Microgravity Fluid Physics and Transport Phenomena Conference; Volume 1; 133-160; NASA/CP-2002-211212/VOL1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The middle atmosphere above Andoya Norway during the winter 1983/84 as derived from metrockets and OH nightglow observations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A total of 110 wind measurements were performed in the middle atmosphere above Andoya (69N, 16E) during the MAP/WINE Campaign from December 2, 1983 to February 23, 1984 using 57 inflatable passive falling spheres, 33 datasondes, 18 foil clouds and 2 instrumented active spheres. Temperature profiles were derived from 42 falling spheres, 26 datasondes and 2 active spheres. Near-mesopause temperatures were determined from OH nightglow observations. Synthesized charts of the temperatures as well as the zonal and meridional wind components between 0 and 90 km altitudes are presented. The temperature measurements indicate the occurrence of several minor and one major stratospheric warming, the latter being observed over Andoya at the end of the launch series.
    Keywords: GEOPHYSICS
    Type: ESA The Seventh ESA Symposium on European Rocket and Balloon Programs and Related Research; p 41-47
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    GRADFLEX: Fluctuations in Microgravity (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We present the results of experimental investigations of gradient driven fluctuations induced in a liquid mixture with a concentration gradient and in a single-component fluid with a temperature gradient. We also describe the experimental apparatus being developed to carry out similar measurement under microgravity conditions.
    Keywords: Physics (General)
    Type: 2004 Photon Correlation and Scattering Conference; 50-51; NASA/CP-2004-213207
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    A correlation of the frictional characteristics for turbulent flow of dilute viscoelastic non- Newtonian fluids in pipes. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Turbulent flow of dilute viscoelastic non- Newtonian fluids in pipes, noting frictional characteristics, elastic fluid parameters, etc
    Keywords: FLUID MECHANICS
    Type: A.I. CH.E. JOURNAL
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A parametric study of the effect of inlet lip shape upon the radiated sound field (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Far field sound radiation predictions for four different axisymmetric inlet lips excited by different tangential acoustic modes at several cut-off ratios are presented. These results were obtained by numerical integration of a special cylindrically symmetric integral representation of the external solutions of the Helmholtz equation which yields unique solutions at all wave numbers. The paper presents plots which detail the dependence of the relative SPL (dB) in the field upon the engine inlet lip shape, the modal input, and the cut-off ratio. Examination of these data indicate that: (1) as the inlet lip becomes larger the predominant acoustic radiation peak in the field becomes narrower and moves towards the centerline of the inlet; (2) as the order of the tangential acoustic mode of the driver increases the radiated sound peak again becomes narrower but moves away from the inlet centerline; and (3) as the cut-off ratio is increased for a specific tangential acoustic mode the predominant radiation peak becomes narrower and moves towards the centerline of the inlet.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 84-0498
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A preview of a microgravity laser light scattering instrument (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of a versatile, miniature, modular light scattering instrument to be used in microgravity is described. The instrument will measure microscopic particles in the size range of thirty angstroms to above three microns. This modular instrument permits several configurations, each optimized for a particular experiment. In particular, a multiangle instrument will probably be mounted in a rack in the Space Shuttle and on the Space Station. It is possible that a Space Shuttle glove-box and a lap-top computer containing a correlator card can be used to perform a number of experiments and to demonstrate the technology needed for more elaborate investigations.
    Keywords: LASERS AND MASERS
    Type: AIAA PAPER 91-0779
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    NASA TECHNICAL REPORTS
  • 9
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    Development of an analytical technique for the optimization of jet engine and duct acoustic liners (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new method was developed for the calculation of optimum constant admittance solutions for the minimization of the sound radiated from an arbitrary axisymmetric body. This method utilizes both the integral equation technique used in the calculation of the optimum non-constant admittance liners and the independent solution generated as a by product of these calculations. The results generated by both these methods are presented for three duct geometries: (1) a straight duct; (2) the QCSEE inlet; and (3) the QCSEE inlet less its centerbody.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-169002 , NAS 1.26:169002
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A theoretical investigation of the sound radiation fields associated with a Bellmouth inlet (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Analytical results are obtained by numerical integration of a cylindrically symmetric integral representation of the external solutions of the Helmholtz equation. The accuracy of this method is checked by comparisons of computed results with 'exact' solutions generated by the point source method. In all cases, the average error for the amplitude and phase of the points calculated in the field is found to be less than ten percent. Theoretical studies which model experiments run for the NASA Langely Bellmouth inlet configuration are presented and comparisons are made with the experimental results. In all cases very good agreement is obtained between the experimental and theoretically calculated values.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 83-0710 , American Institute of Aeronautics and Astronautics, Aeroacoustics Conference; Apr 11, 1983 - Apr 13, 1983; Atlanta, GA
    Format: text
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