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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic circular dichroism of Nd3+ and Yb3+ ions in LiNbO3 crystals (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 6042-6046 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Magnetic circular dichroism (MCD) of trivalent rare earth doped lithium niobate crystals is reported for the first time. Magneto-optical signals of Nd3+ and Yb3+ ions have been studied at 2 K as a function of the magnetic field strength up to 5 T. This study allows the identification of the Zeeman sublevels of these ions, which can be labeled by irreducible representations (Γ4, Γ5, or Γ6), so that the sign and allowance of transitions can be predicted. From the dependence of suitable MCD spectral lines on the magnetic field strength, the effective gyromagnetic factor of the ground state has been determined for both ions: (gNd)(parallel)=1.4±0.1 and; (gYb)(parallel)=4.7±0.1. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479901
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic algorithms as a strategy for feature selection (1992)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 6 (1992), S. 267-281 
    Details
    ISSN: 0886-9383
    Keywords: Genetic algorithms ; Feature selection ; Multivariate analysis ; Optimization methods ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Genetic algorithms have been created as an optimization strategy to be used especially when complex response surfaces do not allow the use of better-known methods (simplex, experimental design techniques, etc.). This paper shows that these algorithms, conveniently modified, can also be a valuable tool in solving the feature selection problem. The subsets of variables selected by genetic algorithms are generally more efficient than those obtained by classical methods of feature selection, since they can produce a better result by using a lower number of features.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180060506
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Behaviour of Ca2Fe2O5 with Nb substitution and sintering temperatures seen by Mössbauer spectroscopy (1991)
    Springer
    Hyperfine interactions 66 (1991), S. 261-266 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectroscopy of samples of Ca2Fe2−xNbxO5+x with x values ranging from 0 to 0.8 and sintering temperatures of 1200°C and 1300°C shows the presence of two magnetic fields and a paramagnetic signal. The behaviour of the parameters as a function of x and of the sintering temperatures are discussed and compared with XRD results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395872
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    Paper (German National Licenses)
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