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  • Analytical Chemistry and Spectroscopy  (2)
  • Lyapunov function  (1)
  • films  (1)
  • 1
    ISSN: 1572-9605
    Keywords: Y1−x HoxBa2Cu3O7 −δ ; films ; magnetron sputtering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Experimental results of research on the influence of deposition temperature (T s) on crystal structure and superconductivity of Y1−x HoxBa2Cu3O7 −δ (YHBCO) films deposited by dcmagnetron sputtering are reported. X-ray diffraction analysis showed that the films grew with preferential orientation of thec-axis normal to the substrate surface in the range of temperature 750–820°C. The single-crystal structure of the YHBCO films grown epitaxially at the optimal substrate temperatures of 820, 800, 760, and 750°C, respectively, have been established by rocking curves, Φ-scan, and electron channeling pattern (ECP). Typical values of the critical current density (A · cm−2) at 77 K and 0.1 T field are 2.1×105, 4×105, 6.2×105, and 3.1×105 for thex=0, 0.2, 0.4, 0.7 films respectively, measured by a Quantum Design magnetrometer (H∥c).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-8450
    Keywords: spinning top ; stabilization ; stereographic projection ; Lyapunov function ; Hamilton-Jacobi theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The dynamical equations for a spinning top are derived in which theorientation is specified by a complex variable using stereographic projectionof Poisson's equations. Necessary and sufficient conditions for Lyapunovstability of the uncontrolled motion of the spinning top are derived usingthe Energy-Casimir method. Control laws that globally asymptoticallystabilize the spinning top to the sleeping motion using two torque actuatorsare synthesized by employing techniques from the theory of systems in cascadeform and generalized using Hamilton-Jacobi-Bellman theory with zero dynamics.In short, this paper provides a nice example where the interplay betweendynamics and control leads to elegant and powerful results.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 6 (1977), S. 212-214 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In the analysis of specimens in aqueous media by the method of X-ray fluorescence the measured intensity was found to be strongly affected by the mylar film used to cover the solution specimen cells.1,2 An increasingly critical absorbance level is observed with decreasing atomic number (increasing wavelength) of the element under examination. The investigation establishes correction coefficients relative to mylar film.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 7 (1978), S. 86-91 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A modified Lanchance-Trail approach is presented for the empirical determination of XRF interelement correction coefficients through experimentation. An exhaustive study of binary systems involving aqueous solution media has been used to obtain the true effects of one element on another, with the additional possibility of taking into consideration other effects which become apparent, such as enhancement effects. The method is described in detail, with several examples provided to show the effectiveness of the procedure. A total of approximately 200 coefficients have been investigated and are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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