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A method for differentiating two brands of black ballpoint pen inks was developed based on infrared spectra (IR) and chemometric methods including discriminant analysis (DA), hierarchical agglomerative cluster analysis (HACA) and principal component analysis (PCA). The spectral region 4000–400 cm−1 was used to ‘fingerprint’ ink comprising a total of 33 samples. Analysis of the spectra of different...
Using reflectance measurements of seven volcanic ash samples from the Eyjafjallajökull eruption in 2010 collected in different locations on Iceland we have started to derive optical constants. We present here initial results for one of the volcanic ash samples collected at Seljavellir farm, Iceland. The results will help in modeling the optical behavior of volcanic ashes. At the same time we could...
The Institute for Planetary Research has an expertise in spectroscopy of minerals, rocks, meteorites, and organic matter, build up in more than two decades. The available equipment allows spectroscopy from the visible to TIR range using bi-conical reflection, transmission and emission spectroscopy. The institute has an outstanding heritage in designing and building infrared remote-sensing instruments...
This paper focuses on two aspects, macroscopic and microscopic, of pure and surfactant-added tetramethylammonium hydroxide (TMAH) wet etching. The macroscopic aspects deal with the technological/engineering applications of pure and surfactant-added TMAH for the fabrication of microelectromechanical systems (MEMS). The microscopic view is focused on the in situ observation of the silicon surface during...
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