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  • 1
    Electronic Resource
    Electronic Resource
    A numerical study of two-dimensional instability-wave control based on the Orr–Sommerfeld equation (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 998-1004 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A numerical method based on solution of the Orr–Sommerfeld equation is formulated to demonstrate the suppression of a two-dimensional, Tollmien–Schlichting-type, time-harmonic instability wave in a developing channel flow by a downstream secondary wave created through alternating suction and blowing at the surface. An analytical expression is derived providing the amplitude and a second parameter (the width or the phase) of the downstream surface-velocity distribution required to create a wave that will suppress the downstream continuation of the original disturbance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866287
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  • 2
    Electronic Resource
    Electronic Resource
    In situ sequential polyurethane poly(methyl methacrylate) interpenetrating polymer networks: structure and elasticity of polyurethane networks (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 1826-1833 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00194a055
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  • 3
    Electronic Resource
    Electronic Resource
    Analyse Instrumental de L'Etain par Activation Neutronique et Spectrometrie de Coincidence (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 9 (1985), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Flous décrivons ici une méthode non destructive de dosage de l'Ptain dans l es roches par activdtion neutronique et spectrometrie de coincidence multiparametrique. Nosrgsultatssonten bun sccord avec ceux obtenus par plusieurs methoties destructives etvont treutilises pour de noivhreuses apDl ications geochimiques. En particulierles standards GSP-1 et surtout BX-N seront utilisés cornme talons de reference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.1985.tb00438.x
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  • 4
    Electronic Resource
    Electronic Resource
    INSTRUMENTAL DETERMINATION OF INDIUM IN GEOCHEMICAL REFERENCE SAMPLES BY EPICADMIUM NEUTRON ACTIVATION ANALYSIS AND KO -STANDARDIZATION (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 13 (1989), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The determination of indium in geological materials is difficult by usual analytical techniques because of their lack of sensitivity. Neutron activation analysis with special irradiation and counting conditions allows to determine indium ultra-traces with a quantitative detection limit about a few parts per billion. The method developed is fast and very sensitive and has been tested successfully for several American and French geochemical standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.1989.tb00468.x
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  • 5
    Electronic Resource
    Electronic Resource
    Analyse des Standards de L'U.S.G.S. : GXR-1 a GXR-6 par Activation Neutronique et Fluorescence X (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 12 (1988), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Six roches standards de I'USGS : GXR-1 à GXR-6 ont été analysées par activation neutronique instrumentale (INAA) pour le dosage de 17 éléments traces et par fluorescence X (XRF) pour les autres éléments difficiles à doser par activation neutronique. Les travaux précédemment publiés par Gladney et al. ont été pris comme référence en particulier les valeurs recommandées (R.V.) qui sont généralement en bon accord avec nos résultats. Quelques remarques et corrections sont proposées pour expliquer certaines disparités.Six United States Geological Survey's (USGS) Geochemical Exploration References Samples (GXR) have been analyzed by instrumental neutron activation analysis (INAA) for the determination of seventeen trace elements and by X-ray fluorescence spectrometry (XRFS) for other trace elements difficult to determine by INAA. Our results compare favourably with the values recommended by E.S. Gladney et al. Some suggestions and corrections are proposed to explain some discrepancies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.1988.tb00041.x
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  • 6
    Electronic Resource
    Electronic Resource
    Approximating linearizations for nonlinear systems (1986)
    Springer
    Circuits, systems and signal processing 5 (1986), S. 419-433 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Given a nonlinear control system $$\dot x(t) = f(x(t)) + \sum\limits_{i = 1}^m {u_i (t)g_i (x(t))}$$ on ℝ n and a pointx 0 in ℝ n , we want to approximate the system nearx 0 by a linear system. Of course, one approach is to use the usual Taylor series linearization. However, the controllability properties of both the nonlinear and linear systems depend on certain Lie brackets of the vector field under consideration. This suggests that we should construct a linear approximation based on Lie bracket matching atx 0. In general, the linearizations based on the Taylor method and the Lie bracket approach are different. However, under certain mild assumptions, we show that there is a coordinate system for ℝ n nearx 0 in which these two types of linearizations agree. We indicate the importance of this agreement by examining the time responses of the nonlinear system and its linear approximation and comparing the lower-order kernels in Volterra expansions of each.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01599618
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  • 7
    Electronic Resource
    Electronic Resource
    Der Einfluß von Strom und Magnetfeld auf die Supraleitungseigenschaften von Nb3Sn-, V3Ga- und V3Si-Diffusionsschichten (1965)
    Springer
    The European physical journal 183 (1965), S. 412-423 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For diffusion layers of Nb3Sn, V3Ga, and V3Si on niobium and vanadium wires, respectively, the transition to superconductivity has been measured at various currents in longitudinal and transverse magnetic fields. Current and field shift the transition curve to lower temperatures, except near the onset of superconductivity where the core of the wire influences the transition. The critical current vs. temperature curves are linear at higher currents, the critical field curves are bended. The results are explained by local variations of the transition temperature due to inhomogeneities and by a displacement of the current paths under the influence of the Lorentz force. For very thin diffusion layers an influence of thickness on the transition temperature has been observed. In addition quenching curves of the diffusion layers have been measured. The shape is in accordance with the model ofKim and coworkers. The absolute values and deviations at higher fields are discussed. A deduction of the critical values at low temperatures from measurements near the transition is possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380768
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  • 8
    Electronic Resource
    Electronic Resource
    Der Übergang zur Supraleitung in Sinterproben des Systems Nb-Sn (1966)
    Springer
    The European physical journal 189 (1966), S. 191-198 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For samples of the system Nb-Sn sintered between 700 and 1500°C with 20 and 25 percent Sn the inductive and resistive transition to superconductivity has been measured. Especially the influence of magnetic fields on the transition has been examined. The inductive transition is deduced from shielding currents, the anomalous rise of the transition temperature for the 4Nb∶1Sn-samples first found byJansen turns out to be a consequence of higher critical currents of these samples. At low sintering temperatures a rise of the critical fields has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327155
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  • 9
    Electronic Resource
    Electronic Resource
    Das Eindringen eines schwachen Magnetfeldes in Supraleiter aus Nb3Sn, Nb3Al und V3Si (1966)
    Springer
    The European physical journal 189 (1966), S. 199-206 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature variation of the initial suszeptibility has been measured for bulk sintered and diffusion samples as well as for finely ground sintered and melted samples of superconducting Nb3Sn, Nb3Al, and V3Si. Penetration effects must be accounted for the width of the inductive transition curve if the interior of the sample is not completely shielded by current loops. Absolute values of the penetration depths after extrapolating to zero temperature were estimated to (0,18±0,04) μ for Nb3Sn, (0,19±0,04) μ for Nb3Al, and (0,27±0,05) μ for V3Si. The transition temperature obtained by suszeptibility measurements is lowered with decreasing grain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327156
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  • 10
    Electronic Resource
    Electronic Resource
    A least squares method for finding the preisach hysteresis operator from measurements (1989)
    Springer
    Numerische Mathematik 55 (1989), S. 695-710 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65D10 ; CR:G1.2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary A finite element like least squares method is introduced for determining the density function in the Preisach hysteresis model from overdeterined measured data. It is shown that the least squares error depends on the quality of the data and the best approximations to the analytic density. For consistent data criteria are given for convergence of the approximate density and Preisach operator with increasing measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389337
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