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  • AIRCRAFT PROPULSION AND POWER  (5)
  • Chemistry  (3)
  • (Human blood)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Inhibition of cyclic AMP phosphodiesterase activity of human blood platelet membrane by ADP
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 984 (1989), S. 113-118 
    Details
    ISSN: 0005-2736
    Keywords: (Human blood) ; Phosphodiesterase ; Platelet membrane ; cyclic AMP
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(89)90350-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray photoelectron spectroscopic studies on ZnO/Bi2O3 varistors (1981)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 3 (1981), S. 142-145 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The intergranular layer and its microstructure, proposed earlier to behave non-linearly in the ZnO/Bi2O3 varistor ceramic system, has been studied by XPS. Our results clearly indicate the formation of an intergranular layer rich in Bi2O3 separating the semiconducting ZnO grains. With increase in sintering temperature, XPS results show the enrichment of the intergranular layer (Bi2O3 phase) without an additional phase being formed. The non-linear coefficient (α) in the current-voltage characteristic increases smoothly up to 1300°C. Afterwards, there is a loss of Bi ions from the Bi2O3 enriched intergranular phase resulting in the decrease of α, and in the characteristic XPS peak intensity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740030308
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  • 3
    Electronic Resource
    Electronic Resource
    Ein Fehlstellenüberstruktur-Modell für γ-Fe2O3 (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 293 (1957), S. 228-232 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Auf Grund magnetischer und röntgenographischer Untersuchungen wird eine Fehlstellenüberstruktur für □-Fe2O3 entwickelt. Bei kubischer Symmetrie, Raumgruppe P43m, Td1, ist ein Eisen(III)-ion auf ½½½ von 4 Leerstellen auf Oktaederplätzen umgeben. Mit einem halben Mol Konstitutionswasser pro Elementarzelle ergibt sich die Formel Fe83+ [Fe123+ □ 4] Fe3+ (OH)-O312-.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19572930310
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal structure of nickel selenide - Ni3Se2 (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 289 (1957), S. 203-206 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The crystal structure of Ni3Se2 has been determined from the X-ray powder diffraction pattern. The unit cell is rhombohedral with a = 4.24 Å, α = 90°38.6′, Z = 1, and space group R 32, D37. The observed and calculated intensities agree for the following arrangement - 2 Se at \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{1}{4}\frac{1}{4}\frac{1}{4},\,\frac{3}{4}\frac{3}{4}\frac{3}{4} $\end{document} and 3 Ni at \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{1}{2}\frac{1}{4}\frac{3}{4},\,\frac{3}{4}\frac{1}{2}\frac{1}{4},\,\frac{1}{4}\frac{3}{4}\frac{1}{2} $\end{document}.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19572890117
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  • 5
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    Effects of friction dampers on aerodynamically unstable rotor stages (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA Journal (ISSN 0001-1452); 23; 262-270
    Format: text
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  • 6
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    Effects of friction dampers on aerodynamically unstable rotor stages (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Attention is given to the physical concepts and mathematical techniques useful in the analysis of the stabilizing effect of friction on aerodynamically unstable rotor stages. Results are presented for three-, four-, and five-bladed disks. In the present multidegree-of-freedom model of an aerodynamically unstable rotor stage, a harmonic steady state solution due to the friction dampers may be either a stability limit, a stable cycle limit, or neither. A criterion is established in the form of an energy function which determines whether the solution is a stability limit. In the event that the initial displacement and velocity exeed those associated with the steady state solution corresponding to a stability limit, the reponse becomes unbounded.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 83-0848
    Format: text
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  • 7
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    Friction damping of flutter in gas turbine engine airfoils (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper investigates the feasibility of using blade-to-ground friction dampers to stabilize flutter in blades. The response of an equivalent one mode model in which the aerodynamic force is represented as negative viscous damping is examined to investigate the following issues: the range of amplitudes over which friction damping can stabilize the response, the maximum negative aerodynamic damping that can be stabilized in such a manner, the effect of simultaneous resonant excitation on these stability limits, and the determination of those damper parameters which will be the best for flutter control.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Aircraft; 20; Apr. 198
    Format: text
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  • 8
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    Stability of limit cycles in frictionally damped and aerodynamically unstable rotor stages (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper deals with the stability of limit cycles (Steady-State Oscillations) associated with the multi-degree-of-freedom model of a frictionally damped and aerodynamically unstable rotor stage. By using the first order averaging technique, a generalized criterion has been established to sort out those unstable limit cycles which govern the maximum transient amplitude beyond which the rotor stage becomes unstable.The stability of the remaining steady-state solutions is analyzed by linearizing the averaged system of differential equations. Numerical results are discussed for three-, four- and five-bladed disks.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Sound and Vibration (ISSN 0022-460X); 103; 341-356
    Format: text
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  • 9
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    Influence of friction dampers on torsional blade flutter (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper deals with the stabilizing effects of dry friction on torsional blade flutter. A lumped parameter model with single degree of freedom per blade has been used to represent the rotor stage. The well-known cascade theories for incompressible and supersonic flows have been used to determine the allowable increase in fluid velocity relative to the blade. It has been found that the effectiveness of friction dampers in controlling flutter can be substantial.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: ASME PAPER 85-GT-170 , ASME, Transactions, Journal of Engineering for Gas Turbines and Power (ISSN 0022-0825); 108; 313-318
    Format: text
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