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  • AERODYNAMICS  (448)
  • Inorganic Chemistry
  • Aircraft Stability and Control
  • GENERAL
  • 1975-1979  (566)
  • 1955-1959  (62)
  • 1
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    Aerodynamic characteristics in ground proximity (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Results from recent investigations in the Langley V/STOL tunnel of an externally blown flap and an upper surface blown flap configuration in ground proximity are presented. Comparisons of longitudinal aerodynamic characteristics indicate that in ground proximity, drag is reduced for both configurations, but changes in lift are configuration dependent. Steady state analyses of the landing approach indicate an increase in flight path angle for both configurations in ground proximity because of the drag reduction. Dynamic analyses with a fixed-base simulator indicate that the resultant flight path during landing approach is dependent on the initial flight path angle and the control technique used.
    Keywords: AERODYNAMICS
    Type: Powered-Lift Aerodyn. and Acoustics; p 145-158
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Steady and unsteady transonic flow (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An investigation of the transonic flow over a circular arc airfoil was conducted to obtain basic information for turbulence modeling of shock-induced separated flows and to verify numerical computer codes which are being developed to simulate such flows. The investigation included the employment of a laser velocimeter to obtain data concerning the mean velocity, the shear stress, and the turbulent kinetic energy profiles in the flowfield downstream of the airfoil midchord where the flow features are more complex. Depending on the free-stream Mach number, the flowfield developed was either steady with shock-wave-induced separation extending from the foot of the shock wave to beyond the trailing edge or unsteady with a periodic motion also undergoing shock-induced separation. The experimental data were compared with the results of numerical simulations in which a computer code was employed that solved the time-dependent Reynolds' averaged compressible Navier-Stokes equations.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 78-160 , Aerospace Sciences Meeting; Jan 16, 1978 - Jan 18, 1978; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An experimental and computational investigation of the flow field about a transonic airfoil in supercritical flow with turbulent boundary-layer separation (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A combined experimental and computational research program for testing and guiding turbulence modeling within regions of separation induced by shock waves incident on turbulent boundary layers is described. Specifically, studies are made of the separated flow over the rear portion of an 18%-thick circular-arc airfoil at zero angle of attack in high Reynolds number supercritical flow. The measurements include distributions of surface static pressure and local skin friction. The instruments employed include high-frequency response pressure cells and a large array of surface hot-wire skin-friction gages. Computations at the experimental flow conditions are made using time-dependent solutions of ensemble-averaged Navier-Stokes equations, plus additional equations for the turbulence modeling.
    Keywords: AERODYNAMICS
    Type: ICAS PAPER 76-15 , Congress; Oct 03, 1976 - Oct 08, 1976; Ottawa; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Aerodynamic drag reduction tests on a full-scale tractor-trailer combination and a representative box-shaped ground vehicle (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: AERODYNAMICS
    Type: SAE PAPER 750703 , West Coast Meeting; Aug 11, 1975 - Aug 14, 1975; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    On turbulence modeling for unsteady transonic flows (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A detailed examination of the turbulent field in an unsteady transonic flow undergoing shock-induced separation is conducted. Ensemble-averaged mean and fluctuating velocities, obtained from conditionally sampled laser velocimeter data, are described and analyzed to assess the applicability of modeling concepts usually employed in steady-flow problems. Some comparisons with computations employing the Reynolds averaged Navier-Stokes equations with a mixing length turbulence model are then presented to illustrate the status of current predictive capabilities. The results appear to imply that turbulence models developed for steady flows apply and that the model need not reflect all the fine details of the turbulent structure but rather account in an approximate way for the production and destruction of the turbulence.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 79-0071 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 15, 1979 - Jan 17, 1979; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
    Electronic Resource
    Electronic Resource
    Darstellung und Molekülstruktur eines Metallclusters mit Cubanstruktur, [η5-C5H5Mo(CO)3HgMo] 4 (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2413-2418 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Molecular Structure of a Metal Cluster with Cubane Structure, [η5-C5H5Mo(CO)3HgMo]4(4)The compound [η5-C5H5Mo(CO)3HgMo]4 has been isolated as an additional product of the reaction between [η5-C5H5Mo(CO)3]2, 2-butenyl chloride, and sodium amalgam. The X-ray structure (R = 0·050) analysis of this novel species revealed that the compound has a slightly distorted cubane structure, for the first time the cubane unit being built up by two different metal atoms (Mo and Hg).
    Notes: Die Verbindung [η5-C5H5Mo(CO)3HgMo]4 (4) wurde als weiteres Produkt der Reaktion zwischen [η5-C5H5Mo(CO)3]2, 2-Butenylchlorid und Natriumamalgam isoliert. Die Röntgenstrukturanalyse dieser neuartigen Spezies zeigt eine leicht verzerrte Cubanstruktur, bei der das Cubangerüst erstmals aus zwei verschiedenen Metallatomen (Mo und Hg) aufgebaut ist. Der R-Wert beträgt 0·050.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120708
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  • 7
    Electronic Resource
    Electronic Resource
    Über Benzal-Derivate des L-Idits (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 2694-2700 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die von E. Fischer und G. Bertrand beschriebenen Tribenzal-L-idite erwiesen sich als identisch mit 1.3;2.4;5.6-Tribenzal-L-idit. Unter wenig abgeänderten Versuchsbedingungen entsteht neben dem Tribenzal-L-idit ein Dibenzal-Derivat, welches einen 2.3.4.5-, wahrscheinlich 2.4;3.5-Dibenzal-L-idit darstellt. Es wird auf den unterschiedlichen Verlauf der Acetalisierung des L-Idits mit Benzaldehyd, bzw. Formaldehyd hingewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590921103
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Katalyse der Ammoniaksynthese und des Stickstoffisotopenaustausches durch Schichtverbindungen von Graphit mit Eisen, Ruthenium und Osmium (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 428 (1977), S. 231-236 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Catalysis of Ammonia Synthesis and Nitrogen Isotope Exchange by Lamellar Compounds of Graphite with Iron, Ruthenium, and OsmiumThe catalytic activity of transition metal potassium-graphite lamellar compounds for the synthesis of ammonia from the elements and the catalysis of the equilibration by isotope exchange of the isotopic nitrogen molecules are shown to correlate. Connections between the state of metal in the catalyst exist with iron as metal which is shown by Mössbauer spectroscopy and the catalytic activity in relation to the potassium content.
    Notes: Die katalytische Aktivität von Übergangsmetall-Kalium-Graphitverbindungen bei der Synthese von Ammoniak aus den Elementen und bei der Einstellung des Isotopenaustauschgleichgewichts der isotopen Stickstoffmolekeln korrelieren miteinander. Im Falle von Eisen als Metall sind Beziehungen zwischen dem durch Mößbauer-Spektroskopie ermittelten Zustand des Metalls im Katalysator und der katalytischen Aktivität in Abhängigkeit vom Kaliumgehalt erkennbar.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774280129
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  • 9
    Electronic Resource
    Electronic Resource
    Transition Metal Chloride Chelates with 1,10-Phenanthroline N-Oxide (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 422 (1976), S. 182-192 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Übergangsmetall-Chlorid-Chelate mit 1.10-Phenanthrolin-N-Oxyd1.10-Phenanthrolin-N-Oxyd(L) reagiert mit 3d Metall-Chloriden unter Bildung folgender Chelate: [CrL2Cl2]Cl · H2O; [FeL2CI2]Cl; [FeLCl2]x (x = 1 oder 2); [MnL2Cl2]; [ClLMnCl2MnLCl] · 2 H2O; [CoL2Cl2] · H2O; [CoLCl2] · H2O; [NiL2Cl2] · 2 H2O; [CuL2Cl]Cl · 2H2O oder [CuL2Cl2] · 2 H2O; und [ZnL3][ZnCl4] · 2 H2O. Diese Chelate wurden mittels Infrarot- und Elektronen-Spektren und magnetischer, röntgenographischer und konduktometrischer Messungen charakterisiert.
    Notes: 1,10-Phenanthroline N-oxide(L) interacts with 3d metal chlorides to yield the following chelates: [CrL2Cl2]Cl · H2O; [FeL2Cl2]Cl; [FeLCl2]x (x = 1 or 2); [MnL2Cl2]; [ClLMnCl2MnLCl] · 2 H2O; [CoL2Cl2] · H2O; [CoLCl2] · H2O; [NiL2Cl2] · 2 H2O; [CuL2Cl]Cl · 2 H2O or [CuL2Cl2] · 2 H2O; and [ZnL3][ZnCl4] · 2 H2O. These complexes were characterized by means of their infrared and electronic spectra, magnetic susceptibilties, X-ray powder diffraction patterns and molar conductivities.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764220211
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  • 10
    Electronic Resource
    Electronic Resource
    Trialkylphosphine Oxide Complexes (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 443 (1978), S. 269-278 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplexe von TrialkylphosphinoxidenEs wird über neue Komplexe von Trimethyl-, Tris(hydroxymethyl)-, Triethyl-, Tripropyl-, Tri-isopropyl-, Tributyl-phosphinoxid berichtet. Aussagen über die Strukturen der Komplexe werden mit Hilfe der Schwingungs- und Ligandenfeld-Spektroskopie erzielt. Die verschiedenen Faktoren, welche die Strukturen beeinflussen, werden diskutiert.
    Notes: A number of new complexes containing trimethylphosphine oxide, tris(hydroxymethyl)phosphine oxide, triethylphosphine oxide, tripropylphosphine oxide, triisopropylphosphine oxide and tributylphosphine oxide is reported. The structures of the complexes have been deduced with the aid of physical measurement such as vibrational and ligand-field spectroscopy. The various factors that influence the structure of phosphoryl solvates and adducts are discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784430130
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