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Polymetric brick wall patterns and two-dimensional substitutions
Pseudo-self-similar tilings 2D-substitutions automatic sequences
2012/6/12
Polymetric walls are walls built from bricks in more than one size. Architects and builders want to built polymetric walls that satisfy certain structural and aesthetical constraints. In a recent pape...
A combinatorial substitution is a map over tilings which allows to define sets of tilings with a strong hierarchical structure. In this paper, we show that such sets of tilings are sofic, that is, can...
Characterization of Octahedral Substitutions in Kaolinites Using Near Infrared Spectroscopy
Kaolinites Near Infrared Spectroscopy Octahedral Substitution
2011/12/2
Abstract: Fourier transform infrared (FTIR) spectroscopy investigations in the near infrared (NIR) region of synthetic and natural kaolinites with various octahedral substitutions have been carried ou...
Infrared Spectroscopy Study of Tetrahedral and Octahedral Substitutions in an Interstratified Illite-Smectite Clay
Chourabi-Fripiat test Hofmann-Klemen effect Illite Infrared spectroscopy Interstratified Smectite Tetrahedral substitution
2011/12/28
Infrared spectroscopy is used to distinguish between octahedral and tetrahedral substitutions in an interstratified illite-smectite clay. The Hofmann-Klemen (Li) test suggests that the AlMg□ and FeMg□...
Effects of Octahedral Mg2+ and Fe3+ Substitutions on Hydrothermal Illitization Reactions
Illite/smectite Illitization Interstratification Octahedral substitution Synthesis
2012/1/4
Three gels of illitic composition having different octahedral substitutions were hydrothermally treated in distilled water at 300°C and 500 bars for 7 to 90 days. The gel of the composition K0.7Al2.0(...
Determination of Tetrahedral Substitutions and Interlayer Surface Heterogeneity from Vibrational Spectra of Ammonium in Smectites
Ammonium Hofmann-Klemen effect Infrared spectroscopy Smectite Tetrahedral substitution
2012/2/8
Integrated intensities of the fundamental modes of vibrations of ammonium in heat-treated, NH4+-exchanged swelling minerals permits (1) a quantitative determination of the amount of tetrahedral substi...
The Influence of Hydroxyl Orientation, Stacking Sequence, and Ionic Substitutions on the Interlayer Bonding of Micas
Hydroxyl Orientation Stacking Sequence Ionic Substitutions Micas
2012/2/13
Hydroxyl orientation has a major influence on the strength of the ionic interlayer bonding in micas because of the strong repulsion between the hydrogen and the interlayer cation (IC). In order to det...