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  • 1
    Electronic Resource
    Electronic Resource
    An Adaptive Control Using Fuzzy Basis Function Expansions for a Class of Nonlinear Systems (1998)
    Springer
    Journal of intelligent and robotic systems 21 (1998), S. 257-275 
    Details
    ISSN: 1573-0409
    Keywords: fuzzy basis function ; adaptive control ; nonlinear systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An adaptive control using fuzzy basis function expansions is proposed for a class of nonlinear systems in this paper. It is shown that two system uncertainty bounds are approximated in a compact set by using fuzzy basis function expansion networks in the Lyapunov sense, and the outputs of the fuzzy networks are then used as the parameters of the controller to adaptively compensate for the effects of system uncertainties. Using this scheme, not only strong robustness with respect to unknown system dynamics and nonlinearities can be obtained, but also the output tracking error between the plant output and the desired reference output can be guaranteed to asymptotically converge to zero. Simulation results are provided to demonstrate the effectiveness, simplicity and practicality of the proposed control scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007962117548
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    Paper (German National Licenses)
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  • 2
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    Comparison between muon spin rotation and neutron scattering studies on the 3-dimensional magnetic ordering of La2CuO(4-y) (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Muon spin rotation and neutron scattering studies on powder and single-crystal specimens of La2CuO(4-y) are compared. The apparent difference between the muon and neutron results for the ordered moment in the antiferromagnetic state is interpreted as the signature of increasingly short-ranged spatial spin correlations with increasing oxygen content.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ., Materials Science with Muon Spin Rotation; 10 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetic field penetration depth of La(1.85)Sr(0.15)CuO4 measured by muon spin relaxation (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Muon-spin-relaxation measurements have been performed on a high-Tc superconductor La(1.85)Sr(0.15)CuO4. In an external transverse magnetic field of 500 G, a magnetic field penetration depth of 2000 A at T = 10 K has been determined from the muon-spin-relaxation rate which increased with decreasing temperature below Tc. From this depth and the Pauli susceptibility, the superconducting carrier density is estimated at 3 x 10 to the 21st per cu cm. The zero-field relaxation rates above and below Tc were equal, which suggests that the superconducting state in this sample is not associated with detectable static magnetic ordering.
    Keywords: SOLID-STATE PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Static magnetic ordering of CeCu2.1Si2 found by muon spin relaxation (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Zero- and longitudinal-field muon spin relaxation measurements on a polycrystal sample of a heavy fermion superconductor CeCu2.1 Si2 (T(c) = 0.7 K) have revealed an onset of static magnetic ordering below T approximately 0.8 K. The line shapes of the observed spectra in zero field indicate a wide distribution of static random local fields at muon sites, suggesting that the ordering is either spin glass or incommensurate spin-density-wave state. The observed width of the random local field at T = 0.05 K corresponds to a small averaged static moment of the order of 0.1 micro-B per formula unit.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ., Materials Science with Muon Spin Rotation; 7 p
    Format: text
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  • 5
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    Studies of superconducting materials with muon spin rotation (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The muon spin rotation/relaxation technique was found to be an exceptionally effective means of measuring the magnetic properties of superconductors, including the new high temperature superconductor materials, at the microscopic level. The technique directly measures the magnetic penetration depth (type II superconductors (SC's)) and detects the presence of magnetic ordering (antiferromagnetism or spin-glass ordering were observed in some high temperature superconductor (HTSC's) and in many closely related compounds). Extensive studies of HTSC materials were conducted by the Virginia State University - College of William and Mary - Columbia University collaboration at Brookhaven National Laboratory and TRIUMF (Vancouver). A survey of LaSrCuO and YBaCaCuO systems shows an essentially linear relationship between the transition temperature T(sub c) and the relaxation rate. This appears to be a manifestation of the proportionality between T(sub c) and the Fermi energy, which suggests a high energy scale for the SC coupling, and which is not consistent with the weak coupling of phonon-mediated SC. Studies of LaCuO and YBaCuO parent compounds show clear evidence of antiferromagnetism. YBa2Cu(3-x)CO(x)O7 shows the simultaneous presence of spin-glass magnetic ordering and superconductivity. Three-dimensional SC, (Ba, K) BiO3, unlike the layered CuO-based compounds, shows no suggestion of magnetic ordering. Experimental techniques and theoretical implications are discussed.
    Keywords: SOLID-STATE PHYSICS
    Type: Alabama A & M Univ., NASA-HBCU Space Science and Engineering Research Forum Proceedings; p 211-21
    Format: application/pdf
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  • 6
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    Coexisting static magnetic ordering and superconductivity in CeCu2.1Si2 found by muon spin relaxation (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Zero- and longitudinal-field muon spin relaxation measurements on a heavy fermion system CeCu2.1 Si2 have revealed an onset of static magnetic ordering below T(M) approximately 0.8 K, which coexists with superconductivity below T(c) = 0.7 K. The line shapes of the observed muon spin depolarization functions suggest an ordering in either spin glass or incommensurate spin-density-wave state, with a small averaged static moment of the order of 0.1 micro-B per formula unit at T approaches 0.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ., Materials Science with Muon Spin Rotation; 14 p
    Format: text
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  • 7
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    Antiferromagnetism of La2CuO(4-y) studied by muon-spin rotation (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Zero-field spin precession of positive muons has been observed in the antiferromagnetic state of La2CuO(4-y). Sharp onsets of the sublattice magnetization are found at temperatures close to those of the susceptibility maxima of different specimens. The long-lived precession signal indicates a microscopically homogeneous distribution of spin density at each Cu atom below the Neel temperature. A combination of the present results and neutron-scattering studies indicates the ordered moment per Cu atom to be significantly less than 1 mu(B).
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 59; 1045-104
    Format: text
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