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  • 1
    ISSN: 1434-4475
    Keywords: Fuzzy-C-Means method ; Cluster analysis ; Composition-property relations ; Glasses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es werden die Möglichkeiten des Fuzzy-C-Means-(FCM)-Algorithmus für Cluster-Analysen zur Untersuchung von Zusammensetzung-Eigenschafts-Relationen diskutiert. Die physikalischen Eigenschaften von 98 Aluminosilikat-Gläsern dienen als Beispiel. Es wird der Einfluß von Anfangsverteilung und Clusteranzahl untersucht. Der FCM-Algorithmus erlaubt das Auffinden von charakteristischen Teilen von Clustern (diese bilden den „Kern“ des Clusters) und auch von Außenseitern des betrachteten Datensatzes. Somit liefern die Ergebnisse der Clusteranalyse die Grundlage für ein tieferes Verständnis der Beziehungen zwischen Zusammensetzung und Eigenschaften von Gläsern.
    Notes: Summary The opportunities of applying the Fuzzy-C-Means (FCM) algorithm for cluster analysis to study composition-property relations are discussed. Physical properties of 98 aluminosilicate glasses serve as an example. The influences of the initial partition and of the number of clusters chosen are discussed in detail. The FCM algorithm allows to find characteristic members of clusters (these form the “nuclei” of the clusters) and to find outliers of the data set under consideration. Thus the results of the cluster analysis form a basis for a deeper understanding of relations between the composition and properties of the glasses studied.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemometrics and Intelligent Laboratory Systems 8 (1990), S. 73-78 
    ISSN: 0169-7439
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemometrics and Intelligent Laboratory Systems 15 (1992), S. 61-73 
    ISSN: 0169-7439
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 31 (1996), S. 1405-1413 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new combination of three-point bending stress and electron spin resonance (ESR) methods was developed and successfully tested in the field of glassy and ceramic materials. Summarizing the observed phenomena, one can establish the following advantages of such an experimental combination: (i) direct and continuous observation of the material under the action of bending stress up to mechanical destruction of the sample; (ii) optically transparent samples are not necessary, but a further direct combination with optical methods is, in general, possible; (iii) the high sensitivity and selectivity of the ESR method allow the first steps of stress influence on the local geometry to be followed long before the crack appears and fracture takes place, respectively; (iv) local effects are observed on the atomic scale which can be related to the mechanical properties by an appropriate hamiltonian; (v) the reversibility of the effects can easily be proved by a suitable alternating stress/relaxation regime; (vi) variation of further parameters such as temperature or application of tensile stress, is possible.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 562 (1988), S. 186-192 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Use of Classification Methods to Interpret the Influence of Solvents on Parameters of EPR SpectraThe influence of solvents on EPR spectra of CuII-Acetylacetonate (registered at room temperature) was investigated. The classification of mean values of the g-tensors and coupling constants using different clustering methods lead to groups of solvents which are related to the respective substance classes. The analysis of the relationship between EPR data and solvent parameters showed, that there exists a close relation between Lewis basicity of solvents and classification found by using clustering methods.
    Notes: Es wurde der Lösungsmitteleinfluß auf die bei Zimmertemperatur aufgenommenen EPR-Spektren des CuII-Acetylacetonats untersucht. Die Klassifikation der erhaltenen Mittelwerte des g-Tensors und der Kopplungskonstante mittels verschiedener Clustermethoden führte zu einer Einteilung der Lösungsmittel, die eine weitgehende Übereinstimmung mit den Substanzklassen aufweist. Die Analyse des Zusammenhanges zwischen EPR-Daten und Lösungsmittelparametern mit Hilfe der linearen Regressionsanalyse zeigte, daß die Lewisbaseneigenschaften der Lösungsmittel mit der oben gefundenen Klasseneinteilung im Zusammenhang stehen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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