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6 Materialschutz und Oberflächentechnik

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Autor

  • Bonse, Jörn (1)
  • Bouchikhi, B. (1)
  • Bougrini, M. (1)
  • Eberstein, M. (1)
  • El Alami-El Hassani, N. (1)
  • El Bari, N. (1)
  • Grehn, M. (1)
  • Hübert, Thomas (1)
  • Mermillod-Blondin, A. (1)
  • Saidi, T. (1)
  • Seuthe, T. (1)
  • Tahri, K. (1)
  • Tiebe, Carlo (1)
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Erscheinungsjahr

  • 2015 (2) (entfernen)

Dokumenttyp

  • Beitrag zu einem Tagungsband (2) (entfernen)

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Schlagworte

  • Chemometrics (1)
  • Geographic differentiation (1)
  • SPME-GC-MS (1)
  • Saffron (1)
  • UV-vis Spectrometry (1)
  • Voltammetric electronic tongue (1)

Organisationseinheit der BAM

  • 6.4 Technologien mit Nanowerkstoffen (2) (entfernen)

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Determination of safranal concentration in saffron samples by means of VE-tongue, SPME-GC-MS, UV-vis spectrophotometry and multivariate analysis (2015)
Tahri, K. ; Tiebe, Carlo ; Bougrini, M. ; Saidi, T. ; El Alami-El Hassani, N. ; El Bari, N. ; Hübert, Thomas ; Bouchikhi, B.
An experimental investigation has been carried out to characterize and discriminate seven saffron samples and to verify their declared geographical origin using a voltammetric electronic tongue (VE-tongue). The ability of multivariable analysis methods such as Principal Component Analysis (PCA), Hierarchical Cluster Analysis (HCA) to classify the saffron samples according to their geographical origin have been investigated. A good discrimination has reached using PCA and HCA in the VE-tongue characterization case. Furthermore, cross validation and Partial Least Square (PLS) techniques were applied in order to build suitable management and prediction models for the determination of safranal concentration in saffron samples based on SPME-GC-MS and UV-Vis Spectrophotometry. The obtained results reveals that some relationships were established between the VE-tongue signal, SPMEGC-MS and UV-Vis spectrophotometry methods to predict safranal concentration levels in saffron samples by using the PLS model. In the light of these results, we can say that the proposed electronic system offer a fast, simple and efficient tool to recognize the declared geographical origin of the saffron samples.
Requirements on glasses for femtosecond-laser based micro-structuring (2015)
Seuthe, T. ; Grehn, M. ; Mermillod-Blondin, A. ; Bonse, Jörn ; Eberstein, M.
In this work, glasses with systematically varied compositions were manufactured and irradiated by single Ti:sapphire fs-laserpulses (800 nm, 120 fs), focused at the surface and into the bulk of the glass materials. The samples were tested for their ablation threshold fluence as well as for structural changes using µ-Raman-spectroscopy. Correlations between the glass composition, the material-ablation on the glass surface and the permanent changes of the refractive index inside the glass volume after the irradiation by fs-laser pulses were obtained. The results show, that the structural modifications found at the surface of the glasses and inside its volume are closely related. However, while the ablation threshold fluence of the glass surface primarily depends on the glass dissociation energy, the permanent refractive index change inside the volume is rather determined by its ability for absorbing the fs-laser pulses and the subsequent relaxation processes. The results of this work provide some guidance on how the glass composition can be varied in order to optimize the fs-laser induced modification of dielectrics.
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